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   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * CONTACTS
   8  *  E-mail regarding any portion of the Linux UDF file system should be
   9  *  directed to the development team mailing list (run by majordomo):
  10  *    linux_udf@hpesjro.fc.hp.com
  11  *
  12  * COPYRIGHT
  13  *  This file is distributed under the terms of the GNU General Public
  14  *  License (GPL). Copies of the GPL can be obtained from:
  15  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  16  *  Each contributing author retains all rights to their own work.
  17  *
  18  *  (C) 1998 Dave Boynton
  19  *  (C) 1998-2004 Ben Fennema
  20  *  (C) 1999-2000 Stelias Computing Inc
  21  *
  22  * HISTORY
  23  *
  24  *  10/04/98 dgb  Added rudimentary directory functions
  25  *  10/07/98      Fully working udf_block_map! It works!
  26  *  11/25/98      bmap altered to better support extents
  27  *  12/06/98 blf  partition support in udf_iget, udf_block_map and udf_read_inode
  28  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  29  *                block boundaries (which is not actually allowed)
  30  *  12/20/98      added support for strategy 4096
  31  *  03/07/99      rewrote udf_block_map (again)
  32  *                New funcs, inode_bmap, udf_next_aext
  33  *  04/19/99      Support for writing device EA's for major/minor #
  34  */
  35
  36 #include "udfdecl.h"
  37 #include <linux/mm.h>
  38 #include <linux/smp_lock.h>
  39 #include <linux/module.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/buffer_head.h>
  42 #include <linux/writeback.h>
  43 #include <linux/slab.h>
  44
  45 #include "udf_i.h"
  46 #include "udf_sb.h"
  47
  48 MODULE_AUTHOR("Ben Fennema");
  49 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  50 MODULE_LICENSE("GPL");
  51
  52 #define EXTENT_MERGE_SIZE 5
  53
  54 static mode_t udf_convert_permissions(struct fileEntry *);
  55 static int udf_update_inode(struct inode *, int);
  56 static void udf_fill_inode(struct inode *, struct buffer_head *);
  57 static struct buffer_head *inode_getblk(struct inode *, long, int *,
  58         long *, int *);
  59 static int8_t udf_insert_aext(struct inode *, kernel_lb_addr, int,
  60         kernel_lb_addr, uint32_t, struct buffer_head *);
  61 static void udf_split_extents(struct inode *, int *, int, int,
  62         kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  63 static void udf_prealloc_extents(struct inode *, int, int,
  64          kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  65 static void udf_merge_extents(struct inode *,
  66          kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  67 static void udf_update_extents(struct inode *,
  68         kernel_long_ad [EXTENT_MERGE_SIZE], int, int,
  69         kernel_lb_addr, uint32_t, struct buffer_head **);
  70 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  71
  72 /*
  73  * udf_delete_inode
  74  *
  75  * PURPOSE
  76  *      Clean-up before the specified inode is destroyed.
  77  *
  78  * DESCRIPTION
  79  *      This routine is called when the kernel destroys an inode structure
  80  *      ie. when iput() finds i_count == 0.
  81  *
  82  * HISTORY
  83  *      July 1, 1997 - Andrew E. Mileski
  84  *      Written, tested, and released.
  85  *
  86  *  Called at the last iput() if i_nlink is zero.
  87  */
  88 void udf_delete_inode(struct inode * inode)
  89 {
  90         truncate_inode_pages(&inode->i_data, 0);
  91
  92         if (is_bad_inode(inode))
  93                 goto no_delete;
  94
  95         inode->i_size = 0;
  96         udf_truncate(inode);
  97         lock_kernel();
  98
  99         udf_update_inode(inode, IS_SYNC(inode));
 100         udf_free_inode(inode);
 101
 102         unlock_kernel();
 103         return;
 104 no_delete:
 105         clear_inode(inode);
 106 }
 107
 108 void udf_clear_inode(struct inode *inode)
 109 {
 110         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 111                 lock_kernel();
 112                 udf_discard_prealloc(inode);
 113                 unlock_kernel();
 114         }
 115
 116         kfree(UDF_I_DATA(inode));
 117         UDF_I_DATA(inode) = NULL;
 118 }
 119
 120 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 121 {
 122         return block_write_full_page(page, udf_get_block, wbc);
 123 }
 124
 125 static int udf_readpage(struct file *file, struct page *page)
 126 {
 127         return block_read_full_page(page, udf_get_block);
 128 }
 129
 130 static int udf_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 131 {
 132         return block_prepare_write(page, from, to, udf_get_block);
 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 struct address_space_operations udf_aops = {
 141         .readpage               = udf_readpage,
 142         .writepage              = udf_writepage,
 143         .sync_page              = block_sync_page,
 144         .prepare_write          = udf_prepare_write,
 145         .commit_write           = generic_commit_write,
 146         .bmap                   = udf_bmap,
 147 };
 148
 149 void udf_expand_file_adinicb(struct inode * inode, int newsize, int * err)
 150 {
 151         struct page *page;
 152         char *kaddr;
 153         struct writeback_control udf_wbc = {
 154                 .sync_mode = WB_SYNC_NONE,
 155                 .nr_to_write = 1,
 156         };
 157
 158         /* from now on we have normal address_space methods */
 159         inode->i_data.a_ops = &udf_aops;
 160
 161         if (!UDF_I_LENALLOC(inode))
 162         {
 163                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 164                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 165                 else
 166                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 167                 mark_inode_dirty(inode);
 168                 return;
 169         }
 170
 171         page = grab_cache_page(inode->i_mapping, 0);
 172         BUG_ON(!PageLocked(page));
 173
 174         if (!PageUptodate(page))
 175         {
 176                 kaddr = kmap(page);
 177                 memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
 178                         PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
 179                 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
 180                         UDF_I_LENALLOC(inode));
 181                 flush_dcache_page(page);
 182                 SetPageUptodate(page);
 183                 kunmap(page);
 184         }
 185         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
 186                 UDF_I_LENALLOC(inode));
 187         UDF_I_LENALLOC(inode) = 0;
 188         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 189                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 190         else
 191                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 192
 193         inode->i_data.a_ops->writepage(page, &udf_wbc);
 194         page_cache_release(page);
 195
 196         mark_inode_dirty(inode);
 197 }
 198
 199 struct buffer_head * udf_expand_dir_adinicb(struct inode *inode, int *block, int *err)
 200 {
 201         int newblock;
 202         struct buffer_head *sbh = NULL, *dbh = NULL;
 203         kernel_lb_addr bloc, eloc;
 204         uint32_t elen, extoffset;
 205         uint8_t alloctype;
 206
 207         struct udf_fileident_bh sfibh, dfibh;
 208         loff_t f_pos = udf_ext0_offset(inode) >> 2;
 209         int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
 210         struct fileIdentDesc cfi, *sfi, *dfi;
 211
 212         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 213                 alloctype = ICBTAG_FLAG_AD_SHORT;
 214         else
 215                 alloctype = ICBTAG_FLAG_AD_LONG;
 216
 217         if (!inode->i_size)
 218         {
 219                 UDF_I_ALLOCTYPE(inode) = alloctype;
 220                 mark_inode_dirty(inode);
 221                 return NULL;
 222         }
 223
 224         /* alloc block, and copy data to it */
 225         *block = udf_new_block(inode->i_sb, inode,
 226                 UDF_I_LOCATION(inode).partitionReferenceNum,
 227                 UDF_I_LOCATION(inode).logicalBlockNum, err);
 228
 229         if (!(*block))
 230                 return NULL;
 231         newblock = udf_get_pblock(inode->i_sb, *block,
 232                 UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 233         if (!newblock)
 234                 return NULL;
 235         dbh = udf_tgetblk(inode->i_sb, newblock);
 236         if (!dbh)
 237                 return NULL;
 238         lock_buffer(dbh);
 239         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 240         set_buffer_uptodate(dbh);
 241         unlock_buffer(dbh);
 242         mark_buffer_dirty_inode(dbh, inode);
 243
 244         sfibh.soffset = sfibh.eoffset = (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2;
 245         sbh = sfibh.sbh = sfibh.ebh = NULL;
 246         dfibh.soffset = dfibh.eoffset = 0;
 247         dfibh.sbh = dfibh.ebh = dbh;
 248         while ( (f_pos < size) )
 249         {
 250                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 251                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL, NULL, NULL);
 252                 if (!sfi)
 253                 {
 254                         udf_release_data(dbh);
 255                         return NULL;
 256                 }
 257                 UDF_I_ALLOCTYPE(inode) = alloctype;
 258                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 259                 dfibh.soffset = dfibh.eoffset;
 260                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 261                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 262                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 263                         sfi->fileIdent + le16_to_cpu(sfi->lengthOfImpUse)))
 264                 {
 265                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 266                         udf_release_data(dbh);
 267                         return NULL;
 268                 }
 269         }
 270         mark_buffer_dirty_inode(dbh, inode);
 271
 272         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode));
 273         UDF_I_LENALLOC(inode) = 0;
 274         bloc = UDF_I_LOCATION(inode);
 275         eloc.logicalBlockNum = *block;
 276         eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 277         elen = inode->i_size;
 278         UDF_I_LENEXTENTS(inode) = elen;
 279         extoffset = udf_file_entry_alloc_offset(inode);
 280         udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &sbh, 0);
 281         /* UniqueID stuff */
 282
 283         udf_release_data(sbh);
 284         mark_inode_dirty(inode);
 285         return dbh;
 286 }
 287
 288 static int udf_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
 289 {
 290         int err, new;
 291         struct buffer_head *bh;
 292         unsigned long phys;
 293
 294         if (!create)
 295         {
 296                 phys = udf_block_map(inode, block);
 297                 if (phys)
 298                         map_bh(bh_result, inode->i_sb, phys);
 299                 return 0;
 300         }
 301
 302         err = -EIO;
 303         new = 0;
 304         bh = NULL;
 305
 306         lock_kernel();
 307
 308         if (block < 0)
 309                 goto abort_negative;
 310
 311         if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1)
 312         {
 313                 UDF_I_NEXT_ALLOC_BLOCK(inode) ++;
 314                 UDF_I_NEXT_ALLOC_GOAL(inode) ++;
 315         }
 316
 317         err = 0;
 318
 319         bh = inode_getblk(inode, block, &err, &phys, &new);
 320         if (bh)
 321                 BUG();
 322         if (err)
 323                 goto abort;
 324         if (!phys)
 325                 BUG();
 326
 327         if (new)
 328                 set_buffer_new(bh_result);
 329         map_bh(bh_result, inode->i_sb, phys);
 330 abort:
 331         unlock_kernel();
 332         return err;
 333
 334 abort_negative:
 335         udf_warning(inode->i_sb, "udf_get_block", "block < 0");
 336         goto abort;
 337 }
 338
 339 static struct buffer_head *
 340 udf_getblk(struct inode *inode, long block, int create, int *err)
 341 {
 342         struct buffer_head dummy;
 343
 344         dummy.b_state = 0;
 345         dummy.b_blocknr = -1000;
 346         *err = udf_get_block(inode, block, &dummy, create);
 347         if (!*err && buffer_mapped(&dummy))
 348         {
 349                 struct buffer_head *bh;
 350                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 351                 if (buffer_new(&dummy))
 352                 {
 353                         lock_buffer(bh);
 354                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 355                         set_buffer_uptodate(bh);
 356                         unlock_buffer(bh);
 357                         mark_buffer_dirty_inode(bh, inode);
 358                 }
 359                 return bh;
 360         }
 361         return NULL;
 362 }
 363
 364 static struct buffer_head * inode_getblk(struct inode * inode, long block,
 365         int *err, long *phys, int *new)
 366 {
 367         struct buffer_head *pbh = NULL, *cbh = NULL, *nbh = NULL, *result = NULL;
 368         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 369         uint32_t pextoffset = 0, cextoffset = 0, nextoffset = 0;
 370         int count = 0, startnum = 0, endnum = 0;
 371         uint32_t elen = 0;
 372         kernel_lb_addr eloc, pbloc, cbloc, nbloc;
 373         int c = 1;
 374         uint64_t lbcount = 0, b_off = 0;
 375         uint32_t newblocknum, newblock, offset = 0;
 376         int8_t etype;
 377         int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
 378         char lastblock = 0;
 379
 380         pextoffset = cextoffset = nextoffset = udf_file_entry_alloc_offset(inode);
 381         b_off = (uint64_t)block << inode->i_sb->s_blocksize_bits;
 382         pbloc = cbloc = nbloc = UDF_I_LOCATION(inode);
 383
 384         /* find the extent which contains the block we are looking for.
 385        alternate between laarr[0] and laarr[1] for locations of the
 386        current extent, and the previous extent */
 387         do
 388         {
 389                 if (pbh != cbh)
 390                 {
 391                         udf_release_data(pbh);
 392                         atomic_inc(&cbh->b_count);
 393                         pbh = cbh;
 394                 }
 395                 if (cbh != nbh)
 396                 {
 397                         udf_release_data(cbh);
 398                         atomic_inc(&nbh->b_count);
 399                         cbh = nbh;
 400                 }
 401
 402                 lbcount += elen;
 403
 404                 pbloc = cbloc;
 405                 cbloc = nbloc;
 406
 407                 pextoffset = cextoffset;
 408                 cextoffset = nextoffset;
 409
 410                 if ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) == -1)
 411                         break;
 412
 413                 c = !c;
 414
 415                 laarr[c].extLength = (etype << 30) | elen;
 416                 laarr[c].extLocation = eloc;
 417
 418                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 419                         pgoal = eloc.logicalBlockNum +
 420                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 421                                 inode->i_sb->s_blocksize_bits);
 422
 423                 count ++;
 424         } while (lbcount + elen <= b_off);
 425
 426         b_off -= lbcount;
 427         offset = b_off >> inode->i_sb->s_blocksize_bits;
 428
 429         /* if the extent is allocated and recorded, return the block
 430        if the extent is not a multiple of the blocksize, round up */
 431
 432         if (etype == (EXT_RECORDED_ALLOCATED >> 30))
 433         {
 434                 if (elen & (inode->i_sb->s_blocksize - 1))
 435                 {
 436                         elen = EXT_RECORDED_ALLOCATED |
 437                                 ((elen + inode->i_sb->s_blocksize - 1) &
 438                                 ~(inode->i_sb->s_blocksize - 1));
 439                         etype = udf_write_aext(inode, nbloc, &cextoffset, eloc, elen, nbh, 1);
 440                 }
 441                 udf_release_data(pbh);
 442                 udf_release_data(cbh);
 443                 udf_release_data(nbh);
 444                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 445                 *phys = newblock;
 446                 return NULL;
 447         }
 448
 449         if (etype == -1)
 450         {
 451                 endnum = startnum = ((count > 1) ? 1 : count);
 452                 if (laarr[c].extLength & (inode->i_sb->s_blocksize - 1))
 453                 {
 454                         laarr[c].extLength =
 455                                 (laarr[c].extLength & UDF_EXTENT_FLAG_MASK) |
 456                                 (((laarr[c].extLength & UDF_EXTENT_LENGTH_MASK) +
 457                                         inode->i_sb->s_blocksize - 1) &
 458                                 ~(inode->i_sb->s_blocksize - 1));
 459                         UDF_I_LENEXTENTS(inode) =
 460                                 (UDF_I_LENEXTENTS(inode) + inode->i_sb->s_blocksize - 1) &
 461                                         ~(inode->i_sb->s_blocksize - 1);
 462                 }
 463                 c = !c;
 464                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 465                         ((offset + 1) << inode->i_sb->s_blocksize_bits);
 466                 memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
 467                 count ++;
 468                 endnum ++;
 469                 lastblock = 1;
 470         }
 471         else
 472                 endnum = startnum = ((count > 2) ? 2 : count);
 473
 474         /* if the current extent is in position 0, swap it with the previous */
 475         if (!c && count != 1)
 476         {
 477                 laarr[2] = laarr[0];
 478                 laarr[0] = laarr[1];
 479                 laarr[1] = laarr[2];
 480                 c = 1;
 481         }
 482
 483         /* if the current block is located in a extent, read the next extent */
 484         if (etype != -1)
 485         {
 486                 if ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 0)) != -1)
 487                 {
 488                         laarr[c+1].extLength = (etype << 30) | elen;
 489                         laarr[c+1].extLocation = eloc;
 490                         count ++;
 491                         startnum ++;
 492                         endnum ++;
 493                 }
 494                 else
 495                         lastblock = 1;
 496         }
 497         udf_release_data(cbh);
 498         udf_release_data(nbh);
 499
 500         /* if the current extent is not recorded but allocated, get the
 501                 block in the extent corresponding to the requested block */
 502         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 503                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 504         else /* otherwise, allocate a new block */
 505         {
 506                 if (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
 507                         goal = UDF_I_NEXT_ALLOC_GOAL(inode);
 508
 509                 if (!goal)
 510                 {
 511                         if (!(goal = pgoal))
 512                                 goal = UDF_I_LOCATION(inode).logicalBlockNum + 1;
 513                 }
 514
 515                 if (!(newblocknum = udf_new_block(inode->i_sb, inode,
 516                         UDF_I_LOCATION(inode).partitionReferenceNum, goal, err)))
 517                 {
 518                         udf_release_data(pbh);
 519                         *err = -ENOSPC;
 520                         return NULL;
 521                 }
 522                 UDF_I_LENEXTENTS(inode) += inode->i_sb->s_blocksize;
 523         }
 524
 525         /* if the extent the requsted block is located in contains multiple blocks,
 526        split the extent into at most three extents. blocks prior to requested
 527        block, requested block, and blocks after requested block */
 528         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 529
 530 #ifdef UDF_PREALLOCATE
 531         /* preallocate blocks */
 532         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 533 #endif
 534
 535         /* merge any continuous blocks in laarr */
 536         udf_merge_extents(inode, laarr, &endnum);
 537
 538         /* write back the new extents, inserting new extents if the new number
 539        of extents is greater than the old number, and deleting extents if
 540        the new number of extents is less than the old number */
 541         udf_update_extents(inode, laarr, startnum, endnum, pbloc, pextoffset, &pbh);
 542
 543         udf_release_data(pbh);
 544
 545         if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum,
 546                 UDF_I_LOCATION(inode).partitionReferenceNum, 0)))
 547         {
 548                 return NULL;
 549         }
 550         *phys = newblock;
 551         *err = 0;
 552         *new = 1;
 553         UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
 554         UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum;
 555         inode->i_ctime = current_fs_time(inode->i_sb);
 556
 557         if (IS_SYNC(inode))
 558                 udf_sync_inode(inode);
 559         else
 560                 mark_inode_dirty(inode);
 561         return result;
 562 }
 563
 564 static void udf_split_extents(struct inode *inode, int *c, int offset, int newblocknum,
 565         kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 566 {
 567         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 568                 (laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 569         {
 570                 int curr = *c;
 571                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 572                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 573                 int8_t etype = (laarr[curr].extLength >> 30);
 574
 575                 if (blen == 1)
 576                         ;
 577                 else if (!offset || blen == offset + 1)
 578                 {
 579                         laarr[curr+2] = laarr[curr+1];
 580                         laarr[curr+1] = laarr[curr];
 581                 }
 582                 else
 583                 {
 584                         laarr[curr+3] = laarr[curr+1];
 585                         laarr[curr+2] = laarr[curr+1] = laarr[curr];
 586                 }
 587
 588                 if (offset)
 589                 {
 590                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 591                         {
 592                                 udf_free_blocks(inode->i_sb, inode, laarr[curr].extLocation, 0, offset);
 593                                 laarr[curr].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 594                                         (offset << inode->i_sb->s_blocksize_bits);
 595                                 laarr[curr].extLocation.logicalBlockNum = 0;
 596                                 laarr[curr].extLocation.partitionReferenceNum = 0;
 597                         }
 598                         else
 599                                 laarr[curr].extLength = (etype << 30) |
 600                                         (offset << inode->i_sb->s_blocksize_bits);
 601                         curr ++;
 602                         (*c) ++;
 603                         (*endnum) ++;
 604                 }
 605
 606                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 607                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 608                         laarr[curr].extLocation.partitionReferenceNum =
 609                                 UDF_I_LOCATION(inode).partitionReferenceNum;
 610                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 611                         inode->i_sb->s_blocksize;
 612                 curr ++;
 613
 614                 if (blen != offset + 1)
 615                 {
 616                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 617                                 laarr[curr].extLocation.logicalBlockNum += (offset + 1);
 618                         laarr[curr].extLength = (etype << 30) |
 619                                 ((blen - (offset + 1)) << inode->i_sb->s_blocksize_bits);
 620                         curr ++;
 621                         (*endnum) ++;
 622                 }
 623         }
 624 }
 625
 626 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 627          kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 628 {
 629         int start, length = 0, currlength = 0, i;
 630
 631         if (*endnum >= (c+1))
 632         {
 633                 if (!lastblock)
 634                         return;
 635                 else
 636                         start = c;
 637         }
 638         else
 639         {
 640                 if ((laarr[c+1].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 641                 {
 642                         start = c+1;
 643                         length = currlength = (((laarr[c+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 644                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 645                 }
 646                 else
 647                         start = c;
 648         }
 649
 650         for (i=start+1; i<=*endnum; i++)
 651         {
 652                 if (i == *endnum)
 653                 {
 654                         if (lastblock)
 655                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 656                 }
 657                 else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 658                         length += (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 659                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 660                 else
 661                         break;
 662         }
 663
 664         if (length)
 665         {
 666                 int next = laarr[start].extLocation.logicalBlockNum +
 667                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 668                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 669                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 670                         laarr[start].extLocation.partitionReferenceNum,
 671                         next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? length :
 672                                 UDF_DEFAULT_PREALLOC_BLOCKS) - currlength);
 673
 674                 if (numalloc)
 675                 {
 676                         if (start == (c+1))
 677                                 laarr[start].extLength +=
 678                                         (numalloc << inode->i_sb->s_blocksize_bits);
 679                         else
 680                         {
 681                                 memmove(&laarr[c+2], &laarr[c+1],
 682                                         sizeof(long_ad) * (*endnum - (c+1)));
 683                                 (*endnum) ++;
 684                                 laarr[c+1].extLocation.logicalBlockNum = next;
 685                                 laarr[c+1].extLocation.partitionReferenceNum =
 686                                         laarr[c].extLocation.partitionReferenceNum;
 687                                 laarr[c+1].extLength = EXT_NOT_RECORDED_ALLOCATED |
 688                                         (numalloc << inode->i_sb->s_blocksize_bits);
 689                                 start = c+1;
 690                         }
 691
 692                         for (i=start+1; numalloc && i<*endnum; i++)
 693                         {
 694                                 int elen = ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 695                                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 696
 697                                 if (elen > numalloc)
 698                                 {
 699                                         laarr[i].extLength -=
 700                                                 (numalloc << inode->i_sb->s_blocksize_bits);
 701                                         numalloc = 0;
 702                                 }
 703                                 else
 704                                 {
 705                                         numalloc -= elen;
 706                                         if (*endnum > (i+1))
 707                                                 memmove(&laarr[i], &laarr[i+1],
 708                                                         sizeof(long_ad) * (*endnum - (i+1)));
 709                                         i --;
 710                                         (*endnum) --;
 711                                 }
 712                         }
 713                         UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
 714                 }
 715         }
 716 }
 717
 718 static void udf_merge_extents(struct inode *inode,
 719          kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 720 {
 721         int i;
 722
 723         for (i=0; i<(*endnum-1); i++)
 724         {
 725                 if ((laarr[i].extLength >> 30) == (laarr[i+1].extLength >> 30))
 726                 {
 727                         if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 728                                 ((laarr[i+1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) ==
 729                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 730                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits)))
 731                         {
 732                                 if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 733                                         (laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 734                                         inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
 735                                 {
 736                                         laarr[i+1].extLength = (laarr[i+1].extLength -
 737                                                 (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 738                                                 UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
 739                                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 740                                                 (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 741                                         laarr[i+1].extLocation.logicalBlockNum =
 742                                                 laarr[i].extLocation.logicalBlockNum +
 743                                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >>
 744                                                         inode->i_sb->s_blocksize_bits);
 745                                 }
 746                                 else
 747                                 {
 748                                         laarr[i].extLength = laarr[i+1].extLength +
 749                                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 750                                                 inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
 751                                         if (*endnum > (i+2))
 752                                                 memmove(&laarr[i+1], &laarr[i+2],
 753                                                         sizeof(long_ad) * (*endnum - (i+2)));
 754                                         i --;
 755                                         (*endnum) --;
 756                                 }
 757                         }
 758                 }
 759                 else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 760                         ((laarr[i+1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)))
 761                 {
 762                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 763                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 764                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 765                         laarr[i].extLocation.logicalBlockNum = 0;
 766                         laarr[i].extLocation.partitionReferenceNum = 0;
 767
 768                         if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 769                                 (laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 770                                 inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
 771                         {
 772                                 laarr[i+1].extLength = (laarr[i+1].extLength -
 773                                         (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 774                                         UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
 775                                 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 776                                         (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 777                         }
 778                         else
 779                         {
 780                                 laarr[i].extLength = laarr[i+1].extLength +
 781                                         (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 782                                         inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
 783                                 if (*endnum > (i+2))
 784                                         memmove(&laarr[i+1], &laarr[i+2],
 785                                                 sizeof(long_ad) * (*endnum - (i+2)));
 786                                 i --;
 787                                 (*endnum) --;
 788                         }
 789                 }
 790                 else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 791                 {
 792                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 793                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 794                                inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 795                         laarr[i].extLocation.logicalBlockNum = 0;
 796                         laarr[i].extLocation.partitionReferenceNum = 0;
 797                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) |
 798                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 799                 }
 800         }
 801 }
 802
 803 static void udf_update_extents(struct inode *inode,
 804         kernel_long_ad laarr[EXTENT_MERGE_SIZE], int startnum, int endnum,
 805         kernel_lb_addr pbloc, uint32_t pextoffset, struct buffer_head **pbh)
 806 {
 807         int start = 0, i;
 808         kernel_lb_addr tmploc;
 809         uint32_t tmplen;
 810
 811         if (startnum > endnum)
 812         {
 813                 for (i=0; i<(startnum-endnum); i++)
 814                 {
 815                         udf_delete_aext(inode, pbloc, pextoffset, laarr[i].extLocation,
 816                                 laarr[i].extLength, *pbh);
 817                 }
 818         }
 819         else if (startnum < endnum)
 820         {
 821                 for (i=0; i<(endnum-startnum); i++)
 822                 {
 823                         udf_insert_aext(inode, pbloc, pextoffset, laarr[i].extLocation,
 824                                 laarr[i].extLength, *pbh);
 825                         udf_next_aext(inode, &pbloc, &pextoffset, &laarr[i].extLocation,
 826                                 &laarr[i].extLength, pbh, 1);
 827                         start ++;
 828                 }
 829         }
 830
 831         for (i=start; i<endnum; i++)
 832         {
 833                 udf_next_aext(inode, &pbloc, &pextoffset, &tmploc, &tmplen, pbh, 0);
 834                 udf_write_aext(inode, pbloc, &pextoffset, laarr[i].extLocation,
 835                         laarr[i].extLength, *pbh, 1);
 836         }
 837 }
 838
 839 struct buffer_head * udf_bread(struct inode * inode, int block,
 840         int create, int * err)
 841 {
 842         struct buffer_head * bh = NULL;
 843
 844         bh = udf_getblk(inode, block, create, err);
 845         if (!bh)
 846                 return NULL;
 847
 848         if (buffer_uptodate(bh))
 849                 return bh;
 850         ll_rw_block(READ, 1, &bh);
 851         wait_on_buffer(bh);
 852         if (buffer_uptodate(bh))
 853                 return bh;
 854         brelse(bh);
 855         *err = -EIO;
 856         return NULL;
 857 }
 858
 859 void udf_truncate(struct inode * inode)
 860 {
 861         int offset;
 862         int err;
 863
 864         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 865                         S_ISLNK(inode->i_mode)))
 866                 return;
 867         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
 868                 return;
 869
 870         lock_kernel();
 871         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 872         {
 873                 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
 874                         inode->i_size))
 875                 {
 876                         udf_expand_file_adinicb(inode, inode->i_size, &err);
 877                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 878                         {
 879                                 inode->i_size = UDF_I_LENALLOC(inode);
 880                                 unlock_kernel();
 881                                 return;
 882                         }
 883                         else
 884                                 udf_truncate_extents(inode);
 885                 }
 886                 else
 887                 {
 888                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
 889                         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00, inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode));
 890                         UDF_I_LENALLOC(inode) = inode->i_size;
 891                 }
 892         }
 893         else
 894         {
 895                 block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block);
 896                 udf_truncate_extents(inode);
 897         }
 898
 899         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
 900         if (IS_SYNC(inode))
 901                 udf_sync_inode (inode);
 902         else
 903                 mark_inode_dirty(inode);
 904         unlock_kernel();
 905 }
 906
 907 static void
 908 __udf_read_inode(struct inode *inode)
 909 {
 910         struct buffer_head *bh = NULL;
 911         struct fileEntry *fe;
 912         uint16_t ident;
 913
 914         /*
 915          * Set defaults, but the inode is still incomplete!
 916          * Note: get_new_inode() sets the following on a new inode:
 917          *      i_sb = sb
 918          *      i_no = ino
 919          *      i_flags = sb->s_flags
 920          *      i_state = 0
 921          * clean_inode(): zero fills and sets
 922          *      i_count = 1
 923          *      i_nlink = 1
 924          *      i_op = NULL;
 925          */
 926         inode->i_blksize = PAGE_SIZE;
 927
 928         bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
 929
 930         if (!bh)
 931         {
 932                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
 933                         inode->i_ino);
 934                 make_bad_inode(inode);
 935                 return;
 936         }
 937
 938         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
 939                 ident != TAG_IDENT_USE)
 940         {
 941                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n",
 942                         inode->i_ino, ident);
 943                 udf_release_data(bh);
 944                 make_bad_inode(inode);
 945                 return;
 946         }
 947
 948         fe = (struct fileEntry *)bh->b_data;
 949
 950         if (le16_to_cpu(fe->icbTag.strategyType) == 4096)
 951         {
 952                 struct buffer_head *ibh = NULL, *nbh = NULL;
 953                 struct indirectEntry *ie;
 954
 955                 ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
 956                 if (ident == TAG_IDENT_IE)
 957                 {
 958                         if (ibh)
 959                         {
 960                                 kernel_lb_addr loc;
 961                                 ie = (struct indirectEntry *)ibh->b_data;
 962
 963                                 loc = lelb_to_cpu(ie->indirectICB.extLocation);
 964
 965                                 if (ie->indirectICB.extLength &&
 966                                         (nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident)))
 967                                 {
 968                                         if (ident == TAG_IDENT_FE ||
 969                                                 ident == TAG_IDENT_EFE)
 970                                         {
 971                                                 memcpy(&UDF_I_LOCATION(inode), &loc, sizeof(kernel_lb_addr));
 972                                                 udf_release_data(bh);
 973                                                 udf_release_data(ibh);
 974                                                 udf_release_data(nbh);
 975                                                 __udf_read_inode(inode);
 976                                                 return;
 977                                         }
 978                                         else
 979                                         {
 980                                                 udf_release_data(nbh);
 981                                                 udf_release_data(ibh);
 982                                         }
 983                                 }
 984                                 else
 985                                         udf_release_data(ibh);
 986                         }
 987                 }
 988                 else
 989                         udf_release_data(ibh);
 990         }
 991         else if (le16_to_cpu(fe->icbTag.strategyType) != 4)
 992         {
 993                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
 994                         le16_to_cpu(fe->icbTag.strategyType));
 995                 udf_release_data(bh);
 996                 make_bad_inode(inode);
 997                 return;
 998         }
 999         udf_fill_inode(inode, bh);
1000         udf_release_data(bh);
1001 }
1002
1003 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1004 {
1005         struct fileEntry *fe;
1006         struct extendedFileEntry *efe;
1007         time_t convtime;
1008         long convtime_usec;
1009         int offset;
1010
1011         fe = (struct fileEntry *)bh->b_data;
1012         efe = (struct extendedFileEntry *)bh->b_data;
1013
1014         if (le16_to_cpu(fe->icbTag.strategyType) == 4)
1015                 UDF_I_STRAT4096(inode) = 0;
1016         else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
1017                 UDF_I_STRAT4096(inode) = 1;
1018
1019         UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
1020         UDF_I_UNIQUE(inode) = 0;
1021         UDF_I_LENEATTR(inode) = 0;
1022         UDF_I_LENEXTENTS(inode) = 0;
1023         UDF_I_LENALLOC(inode) = 0;
1024         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
1025         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
1026         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE)
1027         {
1028                 UDF_I_EFE(inode) = 1;
1029                 UDF_I_USE(inode) = 0;
1030                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
1031                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1032         }
1033         else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE)
1034         {
1035                 UDF_I_EFE(inode) = 0;
1036                 UDF_I_USE(inode) = 0;
1037                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
1038                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1039         }
1040         else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
1041         {
1042                 UDF_I_EFE(inode) = 0;
1043                 UDF_I_USE(inode) = 1;
1044                 UDF_I_LENALLOC(inode) =
1045                         le32_to_cpu(
1046                                 ((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
1047                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry), GFP_KERNEL);
1048                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1049                 return;
1050         }
1051
1052         inode->i_uid = le32_to_cpu(fe->uid);
1053         if ( inode->i_uid == -1 ) inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1054
1055         inode->i_gid = le32_to_cpu(fe->gid);
1056         if ( inode->i_gid == -1 ) inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1057
1058         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1059         if (!inode->i_nlink)
1060                 inode->i_nlink = 1;
1061
1062         inode->i_size = le64_to_cpu(fe->informationLength);
1063         UDF_I_LENEXTENTS(inode) = inode->i_size;
1064
1065         inode->i_mode = udf_convert_permissions(fe);
1066         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1067
1068         if (UDF_I_EFE(inode) == 0)
1069         {
1070                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1071                         (inode->i_sb->s_blocksize_bits - 9);
1072
1073                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1074                         lets_to_cpu(fe->accessTime)) )
1075                 {
1076                         inode->i_atime.tv_sec = convtime;
1077                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1078                 }
1079                 else
1080                 {
1081                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1082                 }
1083
1084                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1085                         lets_to_cpu(fe->modificationTime)) )
1086                 {
1087                         inode->i_mtime.tv_sec = convtime;
1088                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1089                 }
1090                 else
1091                 {
1092                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1093                 }
1094
1095                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1096                         lets_to_cpu(fe->attrTime)) )
1097                 {
1098                         inode->i_ctime.tv_sec = convtime;
1099                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1100                 }
1101                 else
1102                 {
1103                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1104                 }
1105
1106                 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
1107                 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
1108                 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
1109                 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
1110         }
1111         else
1112         {
1113                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1114                         (inode->i_sb->s_blocksize_bits - 9);
1115
1116                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1117                         lets_to_cpu(efe->accessTime)) )
1118                 {
1119                         inode->i_atime.tv_sec = convtime;
1120                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1121                 }
1122                 else
1123                 {
1124                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1125                 }
1126
1127                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1128                         lets_to_cpu(efe->modificationTime)) )
1129                 {
1130                         inode->i_mtime.tv_sec = convtime;
1131                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1132                 }
1133                 else
1134                 {
1135                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1136                 }
1137
1138                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1139                         lets_to_cpu(efe->createTime)) )
1140                 {
1141                         UDF_I_CRTIME(inode).tv_sec = convtime;
1142                         UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
1143                 }
1144                 else
1145                 {
1146                         UDF_I_CRTIME(inode) = UDF_SB_RECORDTIME(inode->i_sb);
1147                 }
1148
1149                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1150                         lets_to_cpu(efe->attrTime)) )
1151                 {
1152                         inode->i_ctime.tv_sec = convtime;
1153                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1154                 }
1155                 else
1156                 {
1157                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1158                 }
1159
1160                 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
1161                 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
1162                 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
1163                 offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
1164         }
1165
1166         switch (fe->icbTag.fileType)
1167         {
1168                 case ICBTAG_FILE_TYPE_DIRECTORY:
1169                 {
1170                         inode->i_op = &udf_dir_inode_operations;
1171                         inode->i_fop = &udf_dir_operations;
1172                         inode->i_mode |= S_IFDIR;
1173                         inode->i_nlink ++;
1174                         break;
1175                 }
1176                 case ICBTAG_FILE_TYPE_REALTIME:
1177                 case ICBTAG_FILE_TYPE_REGULAR:
1178                 case ICBTAG_FILE_TYPE_UNDEF:
1179                 {
1180                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1181                                 inode->i_data.a_ops = &udf_adinicb_aops;
1182                         else
1183                                 inode->i_data.a_ops = &udf_aops;
1184                         inode->i_op = &udf_file_inode_operations;
1185                         inode->i_fop = &udf_file_operations;
1186                         inode->i_mode |= S_IFREG;
1187                         break;
1188                 }
1189                 case ICBTAG_FILE_TYPE_BLOCK:
1190                 {
1191                         inode->i_mode |= S_IFBLK;
1192                         break;
1193                 }
1194                 case ICBTAG_FILE_TYPE_CHAR:
1195                 {
1196                         inode->i_mode |= S_IFCHR;
1197                         break;
1198                 }
1199                 case ICBTAG_FILE_TYPE_FIFO:
1200                 {
1201                         init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1202                         break;
1203                 }
1204                 case ICBTAG_FILE_TYPE_SOCKET:
1205                 {
1206                         init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1207                         break;
1208                 }
1209                 case ICBTAG_FILE_TYPE_SYMLINK:
1210                 {
1211                         inode->i_data.a_ops = &udf_symlink_aops;
1212                         inode->i_op = &page_symlink_inode_operations;
1213                         inode->i_mode = S_IFLNK|S_IRWXUGO;
1214                         break;
1215                 }
1216                 default:
1217                 {
1218                         printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
1219                                 inode->i_ino, fe->icbTag.fileType);
1220                         make_bad_inode(inode);
1221                         return;
1222                 }
1223         }
1224         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1225         {
1226                 struct deviceSpec *dsea =
1227                         (struct deviceSpec *)
1228                                 udf_get_extendedattr(inode, 12, 1);
1229
1230                 if (dsea)
1231                 {
1232                         init_special_inode(inode, inode->i_mode, MKDEV(
1233                                 le32_to_cpu(dsea->majorDeviceIdent),
1234                                 le32_to_cpu(dsea->minorDeviceIdent)));
1235                         /* Developer ID ??? */
1236                 }
1237                 else
1238                 {
1239                         make_bad_inode(inode);
1240                 }
1241         }
1242 }
1243
1244 static mode_t
1245 udf_convert_permissions(struct fileEntry *fe)
1246 {
1247         mode_t mode;
1248         uint32_t permissions;
1249         uint32_t flags;
1250
1251         permissions = le32_to_cpu(fe->permissions);
1252         flags = le16_to_cpu(fe->icbTag.flags);
1253
1254         mode =  (( permissions      ) & S_IRWXO) |
1255                 (( permissions >> 2 ) & S_IRWXG) |
1256                 (( permissions >> 4 ) & S_IRWXU) |
1257                 (( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1258                 (( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1259                 (( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1260
1261         return mode;
1262 }
1263
1264 /*
1265  * udf_write_inode
1266  *
1267  * PURPOSE
1268  *      Write out the specified inode.
1269  *
1270  * DESCRIPTION
1271  *      This routine is called whenever an inode is synced.
1272  *      Currently this routine is just a placeholder.
1273  *
1274  * HISTORY
1275  *      July 1, 1997 - Andrew E. Mileski
1276  *      Written, tested, and released.
1277  */
1278
1279 int udf_write_inode(struct inode * inode, int sync)
1280 {
1281         int ret;
1282         lock_kernel();
1283         ret = udf_update_inode(inode, sync);
1284         unlock_kernel();
1285         return ret;
1286 }
1287
1288 int udf_sync_inode(struct inode * inode)
1289 {
1290         return udf_update_inode(inode, 1);
1291 }
1292
1293 static int
1294 udf_update_inode(struct inode *inode, int do_sync)
1295 {
1296         struct buffer_head *bh = NULL;
1297         struct fileEntry *fe;
1298         struct extendedFileEntry *efe;
1299         uint32_t udfperms;
1300         uint16_t icbflags;
1301         uint16_t crclen;
1302         int i;
1303         kernel_timestamp cpu_time;
1304         int err = 0;
1305
1306         bh = udf_tread(inode->i_sb,
1307                 udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));
1308
1309         if (!bh)
1310         {
1311                 udf_debug("bread failure\n");
1312                 return -EIO;
1313         }
1314
1315         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1316
1317         fe = (struct fileEntry *)bh->b_data;
1318         efe = (struct extendedFileEntry *)bh->b_data;
1319
1320         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
1321         {
1322                 struct unallocSpaceEntry *use =
1323                         (struct unallocSpaceEntry *)bh->b_data;
1324
1325                 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1326                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1327                 crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) -
1328                         sizeof(tag);
1329                 use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1330                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1331                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));
1332
1333                 use->descTag.tagChecksum = 0;
1334                 for (i=0; i<16; i++)
1335                         if (i != 4)
1336                                 use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];
1337
1338                 mark_buffer_dirty(bh);
1339                 udf_release_data(bh);
1340                 return err;
1341         }
1342
1343         if (inode->i_uid != UDF_SB(inode->i_sb)->s_uid)
1344                 fe->uid = cpu_to_le32(inode->i_uid);
1345
1346         if (inode->i_gid != UDF_SB(inode->i_sb)->s_gid)
1347                 fe->gid = cpu_to_le32(inode->i_gid);
1348
1349         udfperms =      ((inode->i_mode & S_IRWXO)     ) |
1350                         ((inode->i_mode & S_IRWXG) << 2) |
1351                         ((inode->i_mode & S_IRWXU) << 4);
1352
1353         udfperms |=     (le32_to_cpu(fe->permissions) &
1354                         (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1355                          FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1356                          FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1357         fe->permissions = cpu_to_le32(udfperms);
1358
1359         if (S_ISDIR(inode->i_mode))
1360                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1361         else
1362                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1363
1364         fe->informationLength = cpu_to_le64(inode->i_size);
1365
1366         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1367         {
1368                 regid *eid;
1369                 struct deviceSpec *dsea =
1370                         (struct deviceSpec *)
1371                                 udf_get_extendedattr(inode, 12, 1);
1372
1373                 if (!dsea)
1374                 {
1375                         dsea = (struct deviceSpec *)
1376                                 udf_add_extendedattr(inode,
1377                                         sizeof(struct deviceSpec) +
1378                                         sizeof(regid), 12, 0x3);
1379                         dsea->attrType = cpu_to_le32(12);
1380                         dsea->attrSubtype = 1;
1381                         dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
1382                                 sizeof(regid));
1383                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1384                 }
1385                 eid = (regid *)dsea->impUse;
1386                 memset(eid, 0, sizeof(regid));
1387                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1388                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1389                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1390                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1391                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1392         }
1393
1394         if (UDF_I_EFE(inode) == 0)
1395         {
1396                 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1397                 fe->logicalBlocksRecorded = cpu_to_le64(
1398                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1399                         (inode->i_sb->s_blocksize_bits - 9));
1400
1401                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1402                         fe->accessTime = cpu_to_lets(cpu_time);
1403                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1404                         fe->modificationTime = cpu_to_lets(cpu_time);
1405                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1406                         fe->attrTime = cpu_to_lets(cpu_time);
1407                 memset(&(fe->impIdent), 0, sizeof(regid));
1408                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1409                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1410                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1411                 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1412                 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1413                 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1414                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1415                 crclen = sizeof(struct fileEntry);
1416         }
1417         else
1418         {
1419                 memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1420                 efe->objectSize = cpu_to_le64(inode->i_size);
1421                 efe->logicalBlocksRecorded = cpu_to_le64(
1422                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1423                         (inode->i_sb->s_blocksize_bits - 9));
1424
1425                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
1426                         (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
1427                          UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec))
1428                 {
1429                         UDF_I_CRTIME(inode) = inode->i_atime;
1430                 }
1431                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
1432                         (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
1433                          UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec))
1434                 {
1435                         UDF_I_CRTIME(inode) = inode->i_mtime;
1436                 }
1437                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
1438                         (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
1439                          UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec))
1440                 {
1441                         UDF_I_CRTIME(inode) = inode->i_ctime;
1442                 }
1443
1444                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1445                         efe->accessTime = cpu_to_lets(cpu_time);
1446                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1447                         efe->modificationTime = cpu_to_lets(cpu_time);
1448                 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
1449                         efe->createTime = cpu_to_lets(cpu_time);
1450                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1451                         efe->attrTime = cpu_to_lets(cpu_time);
1452
1453                 memset(&(efe->impIdent), 0, sizeof(regid));
1454                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1455                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1456                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1457                 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1458                 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1459                 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1460                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1461                 crclen = sizeof(struct extendedFileEntry);
1462         }
1463         if (UDF_I_STRAT4096(inode))
1464         {
1465                 fe->icbTag.strategyType = cpu_to_le16(4096);
1466                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1467                 fe->icbTag.numEntries = cpu_to_le16(2);
1468         }
1469         else
1470         {
1471                 fe->icbTag.strategyType = cpu_to_le16(4);
1472                 fe->icbTag.numEntries = cpu_to_le16(1);
1473         }
1474
1475         if (S_ISDIR(inode->i_mode))
1476                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1477         else if (S_ISREG(inode->i_mode))
1478                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1479         else if (S_ISLNK(inode->i_mode))
1480                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1481         else if (S_ISBLK(inode->i_mode))
1482                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1483         else if (S_ISCHR(inode->i_mode))
1484                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1485         else if (S_ISFIFO(inode->i_mode))
1486                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1487         else if (S_ISSOCK(inode->i_mode))
1488                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1489
1490         icbflags =      UDF_I_ALLOCTYPE(inode) |
1491                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1492                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1493                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1494                         (le16_to_cpu(fe->icbTag.flags) &
1495                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1496                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1497
1498         fe->icbTag.flags = cpu_to_le16(icbflags);
1499         if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1500                 fe->descTag.descVersion = cpu_to_le16(3);
1501         else
1502                 fe->descTag.descVersion = cpu_to_le16(2);
1503         fe->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
1504         fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1505         crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
1506         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1507         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));
1508
1509         fe->descTag.tagChecksum = 0;
1510         for (i=0; i<16; i++)
1511                 if (i != 4)
1512                         fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];
1513
1514         /* write the data blocks */
1515         mark_buffer_dirty(bh);
1516         if (do_sync)
1517         {
1518                 sync_dirty_buffer(bh);
1519                 if (buffer_req(bh) && !buffer_uptodate(bh))
1520                 {
1521                         printk("IO error syncing udf inode [%s:%08lx]\n",
1522                                 inode->i_sb->s_id, inode->i_ino);
1523                         err = -EIO;
1524                 }
1525         }
1526         udf_release_data(bh);
1527         return err;
1528 }
1529
1530 struct inode *
1531 udf_iget(struct super_block *sb, kernel_lb_addr ino)
1532 {
1533         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1534         struct inode *inode = iget_locked(sb, block);
1535
1536         if (!inode)
1537                 return NULL;
1538
1539         if (inode->i_state & I_NEW) {
1540                 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
1541                 __udf_read_inode(inode);
1542                 unlock_new_inode(inode);
1543         }
1544
1545         if (is_bad_inode(inode))
1546                 goto out_iput;
1547
1548         if (ino.logicalBlockNum >= UDF_SB_PARTLEN(sb, ino.partitionReferenceNum)) {
1549                 udf_debug("block=%d, partition=%d out of range\n",
1550                         ino.logicalBlockNum, ino.partitionReferenceNum);
1551                 make_bad_inode(inode);
1552                 goto out_iput;
1553         }
1554
1555         return inode;
1556
1557  out_iput:
1558         iput(inode);
1559         return NULL;
1560 }
1561
1562 int8_t udf_add_aext(struct inode *inode, kernel_lb_addr *bloc, int *extoffset,
1563         kernel_lb_addr eloc, uint32_t elen, struct buffer_head **bh, int inc)
1564 {
1565         int adsize;
1566         short_ad *sad = NULL;
1567         long_ad *lad = NULL;
1568         struct allocExtDesc *aed;
1569         int8_t etype;
1570         uint8_t *ptr;
1571
1572         if (!*bh)
1573                 ptr = UDF_I_DATA(inode) + *extoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1574         else
1575                 ptr = (*bh)->b_data + *extoffset;
1576
1577         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1578                 adsize = sizeof(short_ad);
1579         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1580                 adsize = sizeof(long_ad);
1581         else
1582                 return -1;
1583
1584         if (*extoffset + (2 * adsize) > inode->i_sb->s_blocksize)
1585         {
1586                 char *sptr, *dptr;
1587                 struct buffer_head *nbh;
1588                 int err, loffset;
1589                 kernel_lb_addr obloc = *bloc;
1590
1591                 if (!(bloc->logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1592                         obloc.partitionReferenceNum, obloc.logicalBlockNum, &err)))
1593                 {
1594                         return -1;
1595                 }
1596                 if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1597                         *bloc, 0))))
1598                 {
1599                         return -1;
1600                 }
1601                 lock_buffer(nbh);
1602                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1603                 set_buffer_uptodate(nbh);
1604                 unlock_buffer(nbh);
1605                 mark_buffer_dirty_inode(nbh, inode);
1606
1607                 aed = (struct allocExtDesc *)(nbh->b_data);
1608                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1609                         aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
1610                 if (*extoffset + adsize > inode->i_sb->s_blocksize)
1611                 {
1612                         loffset = *extoffset;
1613                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1614                         sptr = ptr - adsize;
1615                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1616                         memcpy(dptr, sptr, adsize);
1617                         *extoffset = sizeof(struct allocExtDesc) + adsize;
1618                 }
1619                 else
1620                 {
1621                         loffset = *extoffset + adsize;
1622                         aed->lengthAllocDescs = cpu_to_le32(0);
1623                         sptr = ptr;
1624                         *extoffset = sizeof(struct allocExtDesc);
1625
1626                         if (*bh)
1627                         {
1628                                 aed = (struct allocExtDesc *)(*bh)->b_data;
1629                                 aed->lengthAllocDescs =
1630                                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1631                         }
1632                         else
1633                         {
1634                                 UDF_I_LENALLOC(inode) += adsize;
1635                                 mark_inode_dirty(inode);
1636                         }
1637                 }
1638                 if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1639                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1640                                 bloc->logicalBlockNum, sizeof(tag));
1641                 else
1642                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1643                                 bloc->logicalBlockNum, sizeof(tag));
1644                 switch (UDF_I_ALLOCTYPE(inode))
1645                 {
1646                         case ICBTAG_FLAG_AD_SHORT:
1647                         {
1648                                 sad = (short_ad *)sptr;
1649                                 sad->extLength = cpu_to_le32(
1650                                         EXT_NEXT_EXTENT_ALLOCDECS |
1651                                         inode->i_sb->s_blocksize);
1652                                 sad->extPosition = cpu_to_le32(bloc->logicalBlockNum);
1653                                 break;
1654                         }
1655                         case ICBTAG_FLAG_AD_LONG:
1656                         {
1657                                 lad = (long_ad *)sptr;
1658                                 lad->extLength = cpu_to_le32(
1659                                         EXT_NEXT_EXTENT_ALLOCDECS |
1660                                         inode->i_sb->s_blocksize);
1661                                 lad->extLocation = cpu_to_lelb(*bloc);
1662                                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1663                                 break;
1664                         }
1665                 }
1666                 if (*bh)
1667                 {
1668                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1669                                 udf_update_tag((*bh)->b_data, loffset);
1670                         else
1671                                 udf_update_tag((*bh)->b_data, sizeof(struct allocExtDesc));
1672                         mark_buffer_dirty_inode(*bh, inode);
1673                         udf_release_data(*bh);
1674                 }
1675                 else
1676                         mark_inode_dirty(inode);
1677                 *bh = nbh;
1678         }
1679
1680         etype = udf_write_aext(inode, *bloc, extoffset, eloc, elen, *bh, inc);
1681
1682         if (!*bh)
1683         {
1684                 UDF_I_LENALLOC(inode) += adsize;
1685                 mark_inode_dirty(inode);
1686         }
1687         else
1688         {
1689                 aed = (struct allocExtDesc *)(*bh)->b_data;
1690                 aed->lengthAllocDescs =
1691                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1692                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1693                         udf_update_tag((*bh)->b_data, *extoffset + (inc ? 0 : adsize));
1694                 else
1695                         udf_update_tag((*bh)->b_data, sizeof(struct allocExtDesc));
1696                 mark_buffer_dirty_inode(*bh, inode);
1697         }
1698
1699         return etype;
1700 }
1701
1702 int8_t udf_write_aext(struct inode *inode, kernel_lb_addr bloc, int *extoffset,
1703     kernel_lb_addr eloc, uint32_t elen, struct buffer_head *bh, int inc)
1704 {
1705         int adsize;
1706         uint8_t *ptr;
1707
1708         if (!bh)
1709                 ptr = UDF_I_DATA(inode) + *extoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1710         else
1711         {
1712                 ptr = bh->b_data + *extoffset;
1713                 atomic_inc(&bh->b_count);
1714         }
1715
1716         switch (UDF_I_ALLOCTYPE(inode))
1717         {
1718                 case ICBTAG_FLAG_AD_SHORT:
1719                 {
1720                         short_ad *sad = (short_ad *)ptr;
1721                         sad->extLength = cpu_to_le32(elen);
1722                         sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1723                         adsize = sizeof(short_ad);
1724                         break;
1725                 }
1726                 case ICBTAG_FLAG_AD_LONG:
1727                 {
1728                         long_ad *lad = (long_ad *)ptr;
1729                         lad->extLength = cpu_to_le32(elen);
1730                         lad->extLocation = cpu_to_lelb(eloc);
1731                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1732                         adsize = sizeof(long_ad);
1733                         break;
1734                 }
1735                 default:
1736                         return -1;
1737         }
1738
1739         if (bh)
1740         {
1741                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1742                 {
1743                         struct allocExtDesc *aed = (struct allocExtDesc *)(bh)->b_data;
1744                         udf_update_tag((bh)->b_data,
1745                                 le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc));
1746                 }
1747                 mark_buffer_dirty_inode(bh, inode);
1748                 udf_release_data(bh);
1749         }
1750         else
1751                 mark_inode_dirty(inode);
1752
1753         if (inc)
1754                 *extoffset += adsize;
1755         return (elen >> 30);
1756 }
1757
1758 int8_t udf_next_aext(struct inode *inode, kernel_lb_addr *bloc, int *extoffset,
1759         kernel_lb_addr *eloc, uint32_t *elen, struct buffer_head **bh, int inc)
1760 {
1761         int8_t etype;
1762
1763         while ((etype = udf_current_aext(inode, bloc, extoffset, eloc, elen, bh, inc)) ==
1764                 (EXT_NEXT_EXTENT_ALLOCDECS >> 30))
1765         {
1766                 *bloc = *eloc;
1767                 *extoffset = sizeof(struct allocExtDesc);
1768                 udf_release_data(*bh);
1769                 if (!(*bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, *bloc, 0))))
1770                 {
1771                         udf_debug("reading block %d failed!\n",
1772                                 udf_get_lb_pblock(inode->i_sb, *bloc, 0));
1773                         return -1;
1774                 }
1775         }
1776
1777         return etype;
1778 }
1779
1780 int8_t udf_current_aext(struct inode *inode, kernel_lb_addr *bloc, int *extoffset,
1781         kernel_lb_addr *eloc, uint32_t *elen, struct buffer_head **bh, int inc)
1782 {
1783         int alen;
1784         int8_t etype;
1785         uint8_t *ptr;
1786
1787         if (!*bh)
1788         {
1789                 if (!(*extoffset))
1790                         *extoffset = udf_file_entry_alloc_offset(inode);
1791                 ptr = UDF_I_DATA(inode) + *extoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1792                 alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode);
1793         }
1794         else
1795         {
1796                 if (!(*extoffset))
1797                         *extoffset = sizeof(struct allocExtDesc);
1798                 ptr = (*bh)->b_data + *extoffset;
1799                 alen = sizeof(struct allocExtDesc) + le32_to_cpu(((struct allocExtDesc *)(*bh)->b_data)->lengthAllocDescs);
1800         }
1801
1802         switch (UDF_I_ALLOCTYPE(inode))
1803         {
1804                 case ICBTAG_FLAG_AD_SHORT:
1805                 {
1806                         short_ad *sad;
1807
1808                         if (!(sad = udf_get_fileshortad(ptr, alen, extoffset, inc)))
1809                                 return -1;
1810
1811                         etype = le32_to_cpu(sad->extLength) >> 30;
1812                         eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1813                         eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
1814                         *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1815                         break;
1816                 }
1817                 case ICBTAG_FLAG_AD_LONG:
1818                 {
1819                         long_ad *lad;
1820
1821                         if (!(lad = udf_get_filelongad(ptr, alen, extoffset, inc)))
1822                                 return -1;
1823
1824                         etype = le32_to_cpu(lad->extLength) >> 30;
1825                         *eloc = lelb_to_cpu(lad->extLocation);
1826                         *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1827                         break;
1828                 }
1829                 default:
1830                 {
1831                         udf_debug("alloc_type = %d unsupported\n", UDF_I_ALLOCTYPE(inode));
1832                         return -1;
1833                 }
1834         }
1835
1836         return etype;
1837 }
1838
1839 static int8_t
1840 udf_insert_aext(struct inode *inode, kernel_lb_addr bloc, int extoffset,
1841                 kernel_lb_addr neloc, uint32_t nelen, struct buffer_head *bh)
1842 {
1843         kernel_lb_addr oeloc;
1844         uint32_t oelen;
1845         int8_t etype;
1846
1847         if (bh)
1848                 atomic_inc(&bh->b_count);
1849
1850         while ((etype = udf_next_aext(inode, &bloc, &extoffset, &oeloc, &oelen, &bh, 0)) != -1)
1851         {
1852                 udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 1);
1853
1854                 neloc = oeloc;
1855                 nelen = (etype << 30) | oelen;
1856         }
1857         udf_add_aext(inode, &bloc, &extoffset, neloc, nelen, &bh, 1);
1858         udf_release_data(bh);
1859         return (nelen >> 30);
1860 }
1861
1862 int8_t udf_delete_aext(struct inode *inode, kernel_lb_addr nbloc, int nextoffset,
1863         kernel_lb_addr eloc, uint32_t elen, struct buffer_head *nbh)
1864 {
1865         struct buffer_head *obh;
1866         kernel_lb_addr obloc;
1867         int oextoffset, adsize;
1868         int8_t etype;
1869         struct allocExtDesc *aed;
1870
1871         if (nbh)
1872         {
1873                 atomic_inc(&nbh->b_count);
1874                 atomic_inc(&nbh->b_count);
1875         }
1876
1877         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1878                 adsize = sizeof(short_ad);
1879         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1880                 adsize = sizeof(long_ad);
1881         else
1882                 adsize = 0;
1883
1884         obh = nbh;
1885         obloc = nbloc;
1886         oextoffset = nextoffset;
1887
1888         if (udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1) == -1)
1889                 return -1;
1890
1891         while ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) != -1)
1892         {
1893                 udf_write_aext(inode, obloc, &oextoffset, eloc, (etype << 30) | elen, obh, 1);
1894                 if (obh != nbh)
1895                 {
1896                         obloc = nbloc;
1897                         udf_release_data(obh);
1898                         atomic_inc(&nbh->b_count);
1899                         obh = nbh;
1900                         oextoffset = nextoffset - adsize;
1901                 }
1902         }
1903         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1904         elen = 0;
1905
1906         if (nbh != obh)
1907         {
1908                 udf_free_blocks(inode->i_sb, inode, nbloc, 0, 1);
1909                 udf_write_aext(inode, obloc, &oextoffset, eloc, elen, obh, 1);
1910                 udf_write_aext(inode, obloc, &oextoffset, eloc, elen, obh, 1);
1911                 if (!obh)
1912                 {
1913                         UDF_I_LENALLOC(inode) -= (adsize * 2);
1914                         mark_inode_dirty(inode);
1915                 }
1916                 else
1917                 {
1918                         aed = (struct allocExtDesc *)(obh)->b_data;
1919                         aed->lengthAllocDescs =
1920                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2*adsize));
1921                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1922                                 udf_update_tag((obh)->b_data, oextoffset - (2*adsize));
1923                         else
1924                                 udf_update_tag((obh)->b_data, sizeof(struct allocExtDesc));
1925                         mark_buffer_dirty_inode(obh, inode);
1926                 }
1927         }
1928         else
1929         {
1930                 udf_write_aext(inode, obloc, &oextoffset, eloc, elen, obh, 1);
1931                 if (!obh)
1932                 {
1933                         UDF_I_LENALLOC(inode) -= adsize;
1934                         mark_inode_dirty(inode);
1935                 }
1936                 else
1937                 {
1938                         aed = (struct allocExtDesc *)(obh)->b_data;
1939                         aed->lengthAllocDescs =
1940                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize);
1941                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1942                                 udf_update_tag((obh)->b_data, oextoffset - adsize);
1943                         else
1944                                 udf_update_tag((obh)->b_data, sizeof(struct allocExtDesc));
1945                         mark_buffer_dirty_inode(obh, inode);
1946                 }
1947         }
1948
1949         udf_release_data(nbh);
1950         udf_release_data(obh);
1951         return (elen >> 30);
1952 }
1953
1954 int8_t inode_bmap(struct inode *inode, int block, kernel_lb_addr *bloc, uint32_t *extoffset,
1955         kernel_lb_addr *eloc, uint32_t *elen, uint32_t *offset, struct buffer_head **bh)
1956 {
1957         uint64_t lbcount = 0, bcount = (uint64_t)block << inode->i_sb->s_blocksize_bits;
1958         int8_t etype;
1959
1960         if (block < 0)
1961         {
1962                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
1963                 return -1;
1964         }
1965         if (!inode)
1966         {
1967                 printk(KERN_ERR "udf: inode_bmap: NULL inode\n");
1968                 return -1;
1969         }
1970
1971         *extoffset = 0;
1972         *elen = 0;
1973         *bloc = UDF_I_LOCATION(inode);
1974
1975         do
1976         {
1977                 if ((etype = udf_next_aext(inode, bloc, extoffset, eloc, elen, bh, 1)) == -1)
1978                 {
1979                         *offset = bcount - lbcount;
1980                         UDF_I_LENEXTENTS(inode) = lbcount;
1981                         return -1;
1982                 }
1983                 lbcount += *elen;
1984         } while (lbcount <= bcount);
1985
1986         *offset = bcount + *elen - lbcount;
1987
1988         return etype;
1989 }
1990
1991 long udf_block_map(struct inode *inode, long block)
1992 {
1993         kernel_lb_addr eloc, bloc;
1994         uint32_t offset, extoffset, elen;
1995         struct buffer_head *bh = NULL;
1996         int ret;
1997
1998         lock_kernel();
1999
2000         if (inode_bmap(inode, block, &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
2001                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset >> inode->i_sb->s_blocksize_bits);
2002         else
2003                 ret = 0;
2004
2005         unlock_kernel();
2006         udf_release_data(bh);
2007
2008         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2009                 return udf_fixed_to_variable(ret);
2010         else
2011                 return ret;
2012 }