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   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map and udf_read_inode
  23  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  24  *                block boundaries (which is not actually allowed)
  25  *  12/20/98      added support for strategy 4096
  26  *  03/07/99      rewrote udf_block_map (again)
  27  *                New funcs, inode_bmap, udf_next_aext
  28  *  04/19/99      Support for writing device EA's for major/minor #
  29  */
  30
  31 #include "udfdecl.h"
  32 #include <linux/mm.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38 #include <linux/slab.h>
  39
  40 #include "udf_i.h"
  41 #include "udf_sb.h"
  42
  43 MODULE_AUTHOR("Ben Fennema");
  44 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  45 MODULE_LICENSE("GPL");
  46
  47 #define EXTENT_MERGE_SIZE 5
  48
  49 static mode_t udf_convert_permissions(struct fileEntry *);
  50 static int udf_update_inode(struct inode *, int);
  51 static void udf_fill_inode(struct inode *, struct buffer_head *);
  52 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  53         long *, int *);
  54 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  55         kernel_lb_addr, uint32_t);
  56 static void udf_split_extents(struct inode *, int *, int, int,
  57         kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  58 static void udf_prealloc_extents(struct inode *, int, int,
  59          kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  60 static void udf_merge_extents(struct inode *,
  61          kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  62 static void udf_update_extents(struct inode *,
  63         kernel_long_ad [EXTENT_MERGE_SIZE], int, int,
  64         struct extent_position *);
  65 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  66
  67 /*
  68  * udf_delete_inode
  69  *
  70  * PURPOSE
  71  *      Clean-up before the specified inode is destroyed.
  72  *
  73  * DESCRIPTION
  74  *      This routine is called when the kernel destroys an inode structure
  75  *      ie. when iput() finds i_count == 0.
  76  *
  77  * HISTORY
  78  *      July 1, 1997 - Andrew E. Mileski
  79  *      Written, tested, and released.
  80  *
  81  *  Called at the last iput() if i_nlink is zero.
  82  */
  83 void udf_delete_inode(struct inode * inode)
  84 {
  85         truncate_inode_pages(&inode->i_data, 0);
  86
  87         if (is_bad_inode(inode))
  88                 goto no_delete;
  89
  90         inode->i_size = 0;
  91         udf_truncate(inode);
  92         lock_kernel();
  93
  94         udf_update_inode(inode, IS_SYNC(inode));
  95         udf_free_inode(inode);
  96
  97         unlock_kernel();
  98         return;
  99 no_delete:
 100         clear_inode(inode);
 101 }
 102
 103 /*
 104  * If we are going to release inode from memory, we discard preallocation and
 105  * truncate last inode extent to proper length. We could use drop_inode() but
 106  * it's called under inode_lock and thus we cannot mark inode dirty there.  We
 107  * use clear_inode() but we have to make sure to write inode as it's not written
 108  * automatically.
 109  */
 110 void udf_clear_inode(struct inode *inode)
 111 {
 112         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 113                 lock_kernel();
 114                 /* Discard preallocation for directories, symlinks, etc. */
 115                 udf_discard_prealloc(inode);
 116                 udf_truncate_tail_extent(inode);
 117                 unlock_kernel();
 118                 write_inode_now(inode, 1);
 119         }
 120         kfree(UDF_I_DATA(inode));
 121         UDF_I_DATA(inode) = NULL;
 122 }
 123
 124 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 125 {
 126         return block_write_full_page(page, udf_get_block, wbc);
 127 }
 128
 129 static int udf_readpage(struct file *file, struct page *page)
 130 {
 131         return block_read_full_page(page, udf_get_block);
 132 }
 133
 134 static int udf_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 135 {
 136         return block_prepare_write(page, from, to, udf_get_block);
 137 }
 138
 139 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 140 {
 141         return generic_block_bmap(mapping,block,udf_get_block);
 142 }
 143
 144 const struct address_space_operations udf_aops = {
 145         .readpage               = udf_readpage,
 146         .writepage              = udf_writepage,
 147         .sync_page              = block_sync_page,
 148         .prepare_write          = udf_prepare_write,
 149         .commit_write           = generic_commit_write,
 150         .bmap                   = udf_bmap,
 151 };
 152
 153 void udf_expand_file_adinicb(struct inode * inode, int newsize, int * err)
 154 {
 155         struct page *page;
 156         char *kaddr;
 157         struct writeback_control udf_wbc = {
 158                 .sync_mode = WB_SYNC_NONE,
 159                 .nr_to_write = 1,
 160         };
 161
 162         /* from now on we have normal address_space methods */
 163         inode->i_data.a_ops = &udf_aops;
 164
 165         if (!UDF_I_LENALLOC(inode))
 166         {
 167                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 168                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 169                 else
 170                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 171                 mark_inode_dirty(inode);
 172                 return;
 173         }
 174
 175         page = grab_cache_page(inode->i_mapping, 0);
 176         BUG_ON(!PageLocked(page));
 177
 178         if (!PageUptodate(page))
 179         {
 180                 kaddr = kmap(page);
 181                 memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
 182                         PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
 183                 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
 184                         UDF_I_LENALLOC(inode));
 185                 flush_dcache_page(page);
 186                 SetPageUptodate(page);
 187                 kunmap(page);
 188         }
 189         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
 190                 UDF_I_LENALLOC(inode));
 191         UDF_I_LENALLOC(inode) = 0;
 192         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 193                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 194         else
 195                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 196
 197         inode->i_data.a_ops->writepage(page, &udf_wbc);
 198         page_cache_release(page);
 199
 200         mark_inode_dirty(inode);
 201 }
 202
 203 struct buffer_head * udf_expand_dir_adinicb(struct inode *inode, int *block, int *err)
 204 {
 205         int newblock;
 206         struct buffer_head *dbh = NULL;
 207         kernel_lb_addr eloc;
 208         uint32_t elen;
 209         uint8_t alloctype;
 210         struct extent_position epos;
 211
 212         struct udf_fileident_bh sfibh, dfibh;
 213         loff_t f_pos = udf_ext0_offset(inode) >> 2;
 214         int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
 215         struct fileIdentDesc cfi, *sfi, *dfi;
 216
 217         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 218                 alloctype = ICBTAG_FLAG_AD_SHORT;
 219         else
 220                 alloctype = ICBTAG_FLAG_AD_LONG;
 221
 222         if (!inode->i_size)
 223         {
 224                 UDF_I_ALLOCTYPE(inode) = alloctype;
 225                 mark_inode_dirty(inode);
 226                 return NULL;
 227         }
 228
 229         /* alloc block, and copy data to it */
 230         *block = udf_new_block(inode->i_sb, inode,
 231                 UDF_I_LOCATION(inode).partitionReferenceNum,
 232                 UDF_I_LOCATION(inode).logicalBlockNum, err);
 233
 234         if (!(*block))
 235                 return NULL;
 236         newblock = udf_get_pblock(inode->i_sb, *block,
 237                 UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 238         if (!newblock)
 239                 return NULL;
 240         dbh = udf_tgetblk(inode->i_sb, newblock);
 241         if (!dbh)
 242                 return NULL;
 243         lock_buffer(dbh);
 244         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 245         set_buffer_uptodate(dbh);
 246         unlock_buffer(dbh);
 247         mark_buffer_dirty_inode(dbh, inode);
 248
 249         sfibh.soffset = sfibh.eoffset = (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2;
 250         sfibh.sbh = sfibh.ebh = NULL;
 251         dfibh.soffset = dfibh.eoffset = 0;
 252         dfibh.sbh = dfibh.ebh = dbh;
 253         while ( (f_pos < size) )
 254         {
 255                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 256                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL);
 257                 if (!sfi)
 258                 {
 259                         brelse(dbh);
 260                         return NULL;
 261                 }
 262                 UDF_I_ALLOCTYPE(inode) = alloctype;
 263                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 264                 dfibh.soffset = dfibh.eoffset;
 265                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 266                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 267                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 268                         sfi->fileIdent + le16_to_cpu(sfi->lengthOfImpUse)))
 269                 {
 270                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 271                         brelse(dbh);
 272                         return NULL;
 273                 }
 274         }
 275         mark_buffer_dirty_inode(dbh, inode);
 276
 277         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode));
 278         UDF_I_LENALLOC(inode) = 0;
 279         eloc.logicalBlockNum = *block;
 280         eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 281         elen = inode->i_size;
 282         UDF_I_LENEXTENTS(inode) = elen;
 283         epos.bh = NULL;
 284         epos.block = UDF_I_LOCATION(inode);
 285         epos.offset = udf_file_entry_alloc_offset(inode);
 286         udf_add_aext(inode, &epos, eloc, elen, 0);
 287         /* UniqueID stuff */
 288
 289         brelse(epos.bh);
 290         mark_inode_dirty(inode);
 291         return dbh;
 292 }
 293
 294 static int udf_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
 295 {
 296         int err, new;
 297         struct buffer_head *bh;
 298         unsigned long phys;
 299
 300         if (!create)
 301         {
 302                 phys = udf_block_map(inode, block);
 303                 if (phys)
 304                         map_bh(bh_result, inode->i_sb, phys);
 305                 return 0;
 306         }
 307
 308         err = -EIO;
 309         new = 0;
 310         bh = NULL;
 311
 312         lock_kernel();
 313
 314         if (block < 0)
 315                 goto abort_negative;
 316
 317         if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1)
 318         {
 319                 UDF_I_NEXT_ALLOC_BLOCK(inode) ++;
 320                 UDF_I_NEXT_ALLOC_GOAL(inode) ++;
 321         }
 322
 323         err = 0;
 324
 325         bh = inode_getblk(inode, block, &err, &phys, &new);
 326         BUG_ON(bh);
 327         if (err)
 328                 goto abort;
 329         BUG_ON(!phys);
 330
 331         if (new)
 332                 set_buffer_new(bh_result);
 333         map_bh(bh_result, inode->i_sb, phys);
 334 abort:
 335         unlock_kernel();
 336         return err;
 337
 338 abort_negative:
 339         udf_warning(inode->i_sb, "udf_get_block", "block < 0");
 340         goto abort;
 341 }
 342
 343 static struct buffer_head *
 344 udf_getblk(struct inode *inode, long block, int create, int *err)
 345 {
 346         struct buffer_head dummy;
 347
 348         dummy.b_state = 0;
 349         dummy.b_blocknr = -1000;
 350         *err = udf_get_block(inode, block, &dummy, create);
 351         if (!*err && buffer_mapped(&dummy))
 352         {
 353                 struct buffer_head *bh;
 354                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 355                 if (buffer_new(&dummy))
 356                 {
 357                         lock_buffer(bh);
 358                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 359                         set_buffer_uptodate(bh);
 360                         unlock_buffer(bh);
 361                         mark_buffer_dirty_inode(bh, inode);
 362                 }
 363                 return bh;
 364         }
 365         return NULL;
 366 }
 367
 368 /* Extend the file by 'blocks' blocks, return the number of extents added */
 369 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 370         kernel_long_ad *last_ext, sector_t blocks)
 371 {
 372         sector_t add;
 373         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 374         struct super_block *sb = inode->i_sb;
 375         kernel_lb_addr prealloc_loc = {0, 0};
 376         int prealloc_len = 0;
 377
 378         /* The previous extent is fake and we should not extend by anything
 379          * - there's nothing to do... */
 380         if (!blocks && fake)
 381                 return 0;
 382         /* Round the last extent up to a multiple of block size */
 383         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 384                 last_ext->extLength =
 385                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 386                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 387                                 sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 388                 UDF_I_LENEXTENTS(inode) =
 389                         (UDF_I_LENEXTENTS(inode) + sb->s_blocksize - 1) &
 390                                 ~(sb->s_blocksize - 1);
 391         }
 392         /* Last extent are just preallocated blocks? */
 393         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_ALLOCATED) {
 394                 /* Save the extent so that we can reattach it to the end */
 395                 prealloc_loc = last_ext->extLocation;
 396                 prealloc_len = last_ext->extLength;
 397                 /* Mark the extent as a hole */
 398                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 399                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 400                 last_ext->extLocation.logicalBlockNum = 0;
 401                 last_ext->extLocation.partitionReferenceNum = 0;
 402         }
 403         /* Can we merge with the previous extent? */
 404         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_NOT_ALLOCATED) {
 405                 add = ((1<<30) - sb->s_blocksize - (last_ext->extLength &
 406                         UDF_EXTENT_LENGTH_MASK)) >> sb->s_blocksize_bits;
 407                 if (add > blocks)
 408                         add = blocks;
 409                 blocks -= add;
 410                 last_ext->extLength += add << sb->s_blocksize_bits;
 411         }
 412
 413         if (fake) {
 414                 udf_add_aext(inode, last_pos, last_ext->extLocation,
 415                         last_ext->extLength, 1);
 416                 count++;
 417         }
 418         else
 419                 udf_write_aext(inode, last_pos, last_ext->extLocation, last_ext->extLength, 1);
 420         /* Managed to do everything necessary? */
 421         if (!blocks)
 422                 goto out;
 423
 424         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 425         last_ext->extLocation.logicalBlockNum = 0;
 426         last_ext->extLocation.partitionReferenceNum = 0;
 427         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 428         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | (add << sb->s_blocksize_bits);
 429         /* Create enough extents to cover the whole hole */
 430         while (blocks > add) {
 431                 blocks -= add;
 432                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 433                         last_ext->extLength, 1) == -1)
 434                         return -1;
 435                 count++;
 436         }
 437         if (blocks) {
 438                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 439                         (blocks << sb->s_blocksize_bits);
 440                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 441                         last_ext->extLength, 1) == -1)
 442                         return -1;
 443                 count++;
 444         }
 445 out:
 446         /* Do we have some preallocated blocks saved? */
 447         if (prealloc_len) {
 448                 if (udf_add_aext(inode, last_pos, prealloc_loc, prealloc_len, 1) == -1)
 449                         return -1;
 450                 last_ext->extLocation = prealloc_loc;
 451                 last_ext->extLength = prealloc_len;
 452                 count++;
 453         }
 454         /* last_pos should point to the last written extent... */
 455         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
 456                 last_pos->offset -= sizeof(short_ad);
 457         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
 458                 last_pos->offset -= sizeof(long_ad);
 459         else
 460                 return -1;
 461         return count;
 462 }
 463
 464 static struct buffer_head * inode_getblk(struct inode * inode, sector_t block,
 465         int *err, long *phys, int *new)
 466 {
 467         static sector_t last_block;
 468         struct buffer_head *result = NULL;
 469         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 470         struct extent_position prev_epos, cur_epos, next_epos;
 471         int count = 0, startnum = 0, endnum = 0;
 472         uint32_t elen = 0, tmpelen;
 473         kernel_lb_addr eloc, tmpeloc;
 474         int c = 1;
 475         loff_t lbcount = 0, b_off = 0;
 476         uint32_t newblocknum, newblock;
 477         sector_t offset = 0;
 478         int8_t etype;
 479         int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
 480         int lastblock = 0;
 481
 482         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 483         prev_epos.block = UDF_I_LOCATION(inode);
 484         prev_epos.bh = NULL;
 485         cur_epos = next_epos = prev_epos;
 486         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 487
 488         /* find the extent which contains the block we are looking for.
 489        alternate between laarr[0] and laarr[1] for locations of the
 490        current extent, and the previous extent */
 491         do
 492         {
 493                 if (prev_epos.bh != cur_epos.bh)
 494                 {
 495                         brelse(prev_epos.bh);
 496                         get_bh(cur_epos.bh);
 497                         prev_epos.bh = cur_epos.bh;
 498                 }
 499                 if (cur_epos.bh != next_epos.bh)
 500                 {
 501                         brelse(cur_epos.bh);
 502                         get_bh(next_epos.bh);
 503                         cur_epos.bh = next_epos.bh;
 504                 }
 505
 506                 lbcount += elen;
 507
 508                 prev_epos.block = cur_epos.block;
 509                 cur_epos.block = next_epos.block;
 510
 511                 prev_epos.offset = cur_epos.offset;
 512                 cur_epos.offset = next_epos.offset;
 513
 514                 if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1)) == -1)
 515                         break;
 516
 517                 c = !c;
 518
 519                 laarr[c].extLength = (etype << 30) | elen;
 520                 laarr[c].extLocation = eloc;
 521
 522                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 523                         pgoal = eloc.logicalBlockNum +
 524                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 525                                 inode->i_sb->s_blocksize_bits);
 526
 527                 count ++;
 528         } while (lbcount + elen <= b_off);
 529
 530         b_off -= lbcount;
 531         offset = b_off >> inode->i_sb->s_blocksize_bits;
 532         /*
 533          * Move prev_epos and cur_epos into indirect extent if we are at
 534          * the pointer to it
 535          */
 536         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 537         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 538
 539         /* if the extent is allocated and recorded, return the block
 540        if the extent is not a multiple of the blocksize, round up */
 541
 542         if (etype == (EXT_RECORDED_ALLOCATED >> 30))
 543         {
 544                 if (elen & (inode->i_sb->s_blocksize - 1))
 545                 {
 546                         elen = EXT_RECORDED_ALLOCATED |
 547                                 ((elen + inode->i_sb->s_blocksize - 1) &
 548                                 ~(inode->i_sb->s_blocksize - 1));
 549                         etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
 550                 }
 551                 brelse(prev_epos.bh);
 552                 brelse(cur_epos.bh);
 553                 brelse(next_epos.bh);
 554                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 555                 *phys = newblock;
 556                 return NULL;
 557         }
 558
 559         last_block = block;
 560         /* Are we beyond EOF? */
 561         if (etype == -1)
 562         {
 563                 int ret;
 564
 565                 if (count) {
 566                         if (c)
 567                                 laarr[0] = laarr[1];
 568                         startnum = 1;
 569                 }
 570                 else {
 571                         /* Create a fake extent when there's not one */
 572                         memset(&laarr[0].extLocation, 0x00, sizeof(kernel_lb_addr));
 573                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 574                         /* Will udf_extend_file() create real extent from a fake one? */
 575                         startnum = (offset > 0);
 576                 }
 577                 /* Create extents for the hole between EOF and offset */
 578                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 579                 if (ret == -1) {
 580                         brelse(prev_epos.bh);
 581                         brelse(cur_epos.bh);
 582                         brelse(next_epos.bh);
 583                         /* We don't really know the error here so we just make
 584                          * something up */
 585                         *err = -ENOSPC;
 586                         return NULL;
 587                 }
 588                 c = 0;
 589                 offset = 0;
 590                 count += ret;
 591                 /* We are not covered by a preallocated extent? */
 592                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) != EXT_NOT_RECORDED_ALLOCATED) {
 593                         /* Is there any real extent? - otherwise we overwrite
 594                          * the fake one... */
 595                         if (count)
 596                                 c = !c;
 597                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 598                                 inode->i_sb->s_blocksize;
 599                         memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
 600                         count ++;
 601                         endnum ++;
 602                 }
 603                 endnum = c+1;
 604                 lastblock = 1;
 605         }
 606         else {
 607                 endnum = startnum = ((count > 2) ? 2 : count);
 608
 609                 /* if the current extent is in position 0, swap it with the previous */
 610                 if (!c && count != 1)
 611                 {
 612                         laarr[2] = laarr[0];
 613                         laarr[0] = laarr[1];
 614                         laarr[1] = laarr[2];
 615                         c = 1;
 616                 }
 617
 618                 /* if the current block is located in an extent, read the next extent */
 619                 if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0)) != -1)
 620                 {
 621                         laarr[c+1].extLength = (etype << 30) | elen;
 622                         laarr[c+1].extLocation = eloc;
 623                         count ++;
 624                         startnum ++;
 625                         endnum ++;
 626                 }
 627                 else {
 628                         lastblock = 1;
 629                 }
 630         }
 631
 632         /* if the current extent is not recorded but allocated, get the
 633                 block in the extent corresponding to the requested block */
 634         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 635                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 636         else /* otherwise, allocate a new block */
 637         {
 638                 if (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
 639                         goal = UDF_I_NEXT_ALLOC_GOAL(inode);
 640
 641                 if (!goal)
 642                 {
 643                         if (!(goal = pgoal))
 644                                 goal = UDF_I_LOCATION(inode).logicalBlockNum + 1;
 645                 }
 646
 647                 if (!(newblocknum = udf_new_block(inode->i_sb, inode,
 648                         UDF_I_LOCATION(inode).partitionReferenceNum, goal, err)))
 649                 {
 650                         brelse(prev_epos.bh);
 651                         *err = -ENOSPC;
 652                         return NULL;
 653                 }
 654                 UDF_I_LENEXTENTS(inode) += inode->i_sb->s_blocksize;
 655         }
 656
 657         /* if the extent the requsted block is located in contains multiple blocks,
 658        split the extent into at most three extents. blocks prior to requested
 659        block, requested block, and blocks after requested block */
 660         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 661
 662 #ifdef UDF_PREALLOCATE
 663         /* preallocate blocks */
 664         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 665 #endif
 666
 667         /* merge any continuous blocks in laarr */
 668         udf_merge_extents(inode, laarr, &endnum);
 669
 670         /* write back the new extents, inserting new extents if the new number
 671         of extents is greater than the old number, and deleting extents if
 672         the new number of extents is less than the old number */
 673         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 674
 675         brelse(prev_epos.bh);
 676
 677         if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum,
 678                 UDF_I_LOCATION(inode).partitionReferenceNum, 0)))
 679         {
 680                 return NULL;
 681         }
 682         *phys = newblock;
 683         *err = 0;
 684         *new = 1;
 685         UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
 686         UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum;
 687         inode->i_ctime = current_fs_time(inode->i_sb);
 688
 689         if (IS_SYNC(inode))
 690                 udf_sync_inode(inode);
 691         else
 692                 mark_inode_dirty(inode);
 693         return result;
 694 }
 695
 696 static void udf_split_extents(struct inode *inode, int *c, int offset, int newblocknum,
 697         kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 698 {
 699         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 700                 (laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 701         {
 702                 int curr = *c;
 703                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 704                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 705                 int8_t etype = (laarr[curr].extLength >> 30);
 706
 707                 if (blen == 1)
 708                         ;
 709                 else if (!offset || blen == offset + 1)
 710                 {
 711                         laarr[curr+2] = laarr[curr+1];
 712                         laarr[curr+1] = laarr[curr];
 713                 }
 714                 else
 715                 {
 716                         laarr[curr+3] = laarr[curr+1];
 717                         laarr[curr+2] = laarr[curr+1] = laarr[curr];
 718                 }
 719
 720                 if (offset)
 721                 {
 722                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 723                         {
 724                                 udf_free_blocks(inode->i_sb, inode, laarr[curr].extLocation, 0, offset);
 725                                 laarr[curr].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 726                                         (offset << inode->i_sb->s_blocksize_bits);
 727                                 laarr[curr].extLocation.logicalBlockNum = 0;
 728                                 laarr[curr].extLocation.partitionReferenceNum = 0;
 729                         }
 730                         else
 731                                 laarr[curr].extLength = (etype << 30) |
 732                                         (offset << inode->i_sb->s_blocksize_bits);
 733                         curr ++;
 734                         (*c) ++;
 735                         (*endnum) ++;
 736                 }
 737
 738                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 739                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 740                         laarr[curr].extLocation.partitionReferenceNum =
 741                                 UDF_I_LOCATION(inode).partitionReferenceNum;
 742                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 743                         inode->i_sb->s_blocksize;
 744                 curr ++;
 745
 746                 if (blen != offset + 1)
 747                 {
 748                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 749                                 laarr[curr].extLocation.logicalBlockNum += (offset + 1);
 750                         laarr[curr].extLength = (etype << 30) |
 751                                 ((blen - (offset + 1)) << inode->i_sb->s_blocksize_bits);
 752                         curr ++;
 753                         (*endnum) ++;
 754                 }
 755         }
 756 }
 757
 758 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 759          kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 760 {
 761         int start, length = 0, currlength = 0, i;
 762
 763         if (*endnum >= (c+1))
 764         {
 765                 if (!lastblock)
 766                         return;
 767                 else
 768                         start = c;
 769         }
 770         else
 771         {
 772                 if ((laarr[c+1].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 773                 {
 774                         start = c+1;
 775                         length = currlength = (((laarr[c+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 776                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 777                 }
 778                 else
 779                         start = c;
 780         }
 781
 782         for (i=start+1; i<=*endnum; i++)
 783         {
 784                 if (i == *endnum)
 785                 {
 786                         if (lastblock)
 787                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 788                 }
 789                 else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 790                         length += (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 791                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 792                 else
 793                         break;
 794         }
 795
 796         if (length)
 797         {
 798                 int next = laarr[start].extLocation.logicalBlockNum +
 799                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 800                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 801                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 802                         laarr[start].extLocation.partitionReferenceNum,
 803                         next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? length :
 804                                 UDF_DEFAULT_PREALLOC_BLOCKS) - currlength);
 805
 806                 if (numalloc)
 807                 {
 808                         if (start == (c+1))
 809                                 laarr[start].extLength +=
 810                                         (numalloc << inode->i_sb->s_blocksize_bits);
 811                         else
 812                         {
 813                                 memmove(&laarr[c+2], &laarr[c+1],
 814                                         sizeof(long_ad) * (*endnum - (c+1)));
 815                                 (*endnum) ++;
 816                                 laarr[c+1].extLocation.logicalBlockNum = next;
 817                                 laarr[c+1].extLocation.partitionReferenceNum =
 818                                         laarr[c].extLocation.partitionReferenceNum;
 819                                 laarr[c+1].extLength = EXT_NOT_RECORDED_ALLOCATED |
 820                                         (numalloc << inode->i_sb->s_blocksize_bits);
 821                                 start = c+1;
 822                         }
 823
 824                         for (i=start+1; numalloc && i<*endnum; i++)
 825                         {
 826                                 int elen = ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 827                                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 828
 829                                 if (elen > numalloc)
 830                                 {
 831                                         laarr[i].extLength -=
 832                                                 (numalloc << inode->i_sb->s_blocksize_bits);
 833                                         numalloc = 0;
 834                                 }
 835                                 else
 836                                 {
 837                                         numalloc -= elen;
 838                                         if (*endnum > (i+1))
 839                                                 memmove(&laarr[i], &laarr[i+1],
 840                                                         sizeof(long_ad) * (*endnum - (i+1)));
 841                                         i --;
 842                                         (*endnum) --;
 843                                 }
 844                         }
 845                         UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
 846                 }
 847         }
 848 }
 849
 850 static void udf_merge_extents(struct inode *inode,
 851          kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 852 {
 853         int i;
 854
 855         for (i=0; i<(*endnum-1); i++)
 856         {
 857                 if ((laarr[i].extLength >> 30) == (laarr[i+1].extLength >> 30))
 858                 {
 859                         if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 860                                 ((laarr[i+1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) ==
 861                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 862                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits)))
 863                         {
 864                                 if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 865                                         (laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 866                                         inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
 867                                 {
 868                                         laarr[i+1].extLength = (laarr[i+1].extLength -
 869                                                 (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 870                                                 UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
 871                                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 872                                                 (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 873                                         laarr[i+1].extLocation.logicalBlockNum =
 874                                                 laarr[i].extLocation.logicalBlockNum +
 875                                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >>
 876                                                         inode->i_sb->s_blocksize_bits);
 877                                 }
 878                                 else
 879                                 {
 880                                         laarr[i].extLength = laarr[i+1].extLength +
 881                                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 882                                                 inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
 883                                         if (*endnum > (i+2))
 884                                                 memmove(&laarr[i+1], &laarr[i+2],
 885                                                         sizeof(long_ad) * (*endnum - (i+2)));
 886                                         i --;
 887                                         (*endnum) --;
 888                                 }
 889                         }
 890                 }
 891                 else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 892                         ((laarr[i+1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)))
 893                 {
 894                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 895                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 896                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 897                         laarr[i].extLocation.logicalBlockNum = 0;
 898                         laarr[i].extLocation.partitionReferenceNum = 0;
 899
 900                         if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 901                                 (laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 902                                 inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
 903                         {
 904                                 laarr[i+1].extLength = (laarr[i+1].extLength -
 905                                         (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 906                                         UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
 907                                 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 908                                         (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 909                         }
 910                         else
 911                         {
 912                                 laarr[i].extLength = laarr[i+1].extLength +
 913                                         (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 914                                         inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
 915                                 if (*endnum > (i+2))
 916                                         memmove(&laarr[i+1], &laarr[i+2],
 917                                                 sizeof(long_ad) * (*endnum - (i+2)));
 918                                 i --;
 919                                 (*endnum) --;
 920                         }
 921                 }
 922                 else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 923                 {
 924                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 925                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 926                                inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 927                         laarr[i].extLocation.logicalBlockNum = 0;
 928                         laarr[i].extLocation.partitionReferenceNum = 0;
 929                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) |
 930                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 931                 }
 932         }
 933 }
 934
 935 static void udf_update_extents(struct inode *inode,
 936         kernel_long_ad laarr[EXTENT_MERGE_SIZE], int startnum, int endnum,
 937         struct extent_position *epos)
 938 {
 939         int start = 0, i;
 940         kernel_lb_addr tmploc;
 941         uint32_t tmplen;
 942
 943         if (startnum > endnum)
 944         {
 945                 for (i=0; i<(startnum-endnum); i++)
 946                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 947                                 laarr[i].extLength);
 948         }
 949         else if (startnum < endnum)
 950         {
 951                 for (i=0; i<(endnum-startnum); i++)
 952                 {
 953                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 954                                 laarr[i].extLength);
 955                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 956                                 &laarr[i].extLength, 1);
 957                         start ++;
 958                 }
 959         }
 960
 961         for (i=start; i<endnum; i++)
 962         {
 963                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 964                 udf_write_aext(inode, epos, laarr[i].extLocation,
 965                         laarr[i].extLength, 1);
 966         }
 967 }
 968
 969 struct buffer_head * udf_bread(struct inode * inode, int block,
 970         int create, int * err)
 971 {
 972         struct buffer_head * bh = NULL;
 973
 974         bh = udf_getblk(inode, block, create, err);
 975         if (!bh)
 976                 return NULL;
 977
 978         if (buffer_uptodate(bh))
 979                 return bh;
 980         ll_rw_block(READ, 1, &bh);
 981         wait_on_buffer(bh);
 982         if (buffer_uptodate(bh))
 983                 return bh;
 984         brelse(bh);
 985         *err = -EIO;
 986         return NULL;
 987 }
 988
 989 void udf_truncate(struct inode * inode)
 990 {
 991         int offset;
 992         int err;
 993
 994         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 995                         S_ISLNK(inode->i_mode)))
 996                 return;
 997         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
 998                 return;
 999
1000         lock_kernel();
1001         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1002         {
1003                 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
1004                         inode->i_size))
1005                 {
1006                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1007                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1008                         {
1009                                 inode->i_size = UDF_I_LENALLOC(inode);
1010                                 unlock_kernel();
1011                                 return;
1012                         }
1013                         else
1014                                 udf_truncate_extents(inode);
1015                 }
1016                 else
1017                 {
1018                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1019                         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00, inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode));
1020                         UDF_I_LENALLOC(inode) = inode->i_size;
1021                 }
1022         }
1023         else
1024         {
1025                 block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block);
1026                 udf_truncate_extents(inode);
1027         }
1028
1029         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1030         if (IS_SYNC(inode))
1031                 udf_sync_inode (inode);
1032         else
1033                 mark_inode_dirty(inode);
1034         unlock_kernel();
1035 }
1036
1037 static void
1038 __udf_read_inode(struct inode *inode)
1039 {
1040         struct buffer_head *bh = NULL;
1041         struct fileEntry *fe;
1042         uint16_t ident;
1043
1044         /*
1045          * Set defaults, but the inode is still incomplete!
1046          * Note: get_new_inode() sets the following on a new inode:
1047          *      i_sb = sb
1048          *      i_no = ino
1049          *      i_flags = sb->s_flags
1050          *      i_state = 0
1051          * clean_inode(): zero fills and sets
1052          *      i_count = 1
1053          *      i_nlink = 1
1054          *      i_op = NULL;
1055          */
1056         bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
1057
1058         if (!bh)
1059         {
1060                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1061                         inode->i_ino);
1062                 make_bad_inode(inode);
1063                 return;
1064         }
1065
1066         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1067                 ident != TAG_IDENT_USE)
1068         {
1069                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n",
1070                         inode->i_ino, ident);
1071                 brelse(bh);
1072                 make_bad_inode(inode);
1073                 return;
1074         }
1075
1076         fe = (struct fileEntry *)bh->b_data;
1077
1078         if (le16_to_cpu(fe->icbTag.strategyType) == 4096)
1079         {
1080                 struct buffer_head *ibh = NULL, *nbh = NULL;
1081                 struct indirectEntry *ie;
1082
1083                 ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
1084                 if (ident == TAG_IDENT_IE)
1085                 {
1086                         if (ibh)
1087                         {
1088                                 kernel_lb_addr loc;
1089                                 ie = (struct indirectEntry *)ibh->b_data;
1090
1091                                 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1092
1093                                 if (ie->indirectICB.extLength &&
1094                                         (nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident)))
1095                                 {
1096                                         if (ident == TAG_IDENT_FE ||
1097                                                 ident == TAG_IDENT_EFE)
1098                                         {
1099                                                 memcpy(&UDF_I_LOCATION(inode), &loc, sizeof(kernel_lb_addr));
1100                                                 brelse(bh);
1101                                                 brelse(ibh);
1102                                                 brelse(nbh);
1103                                                 __udf_read_inode(inode);
1104                                                 return;
1105                                         }
1106                                         else
1107                                         {
1108                                                 brelse(nbh);
1109                                                 brelse(ibh);
1110                                         }
1111                                 }
1112                                 else
1113                                         brelse(ibh);
1114                         }
1115                 }
1116                 else
1117                         brelse(ibh);
1118         }
1119         else if (le16_to_cpu(fe->icbTag.strategyType) != 4)
1120         {
1121                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1122                         le16_to_cpu(fe->icbTag.strategyType));
1123                 brelse(bh);
1124                 make_bad_inode(inode);
1125                 return;
1126         }
1127         udf_fill_inode(inode, bh);
1128
1129         brelse(bh);
1130 }
1131
1132 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1133 {
1134         struct fileEntry *fe;
1135         struct extendedFileEntry *efe;
1136         time_t convtime;
1137         long convtime_usec;
1138         int offset;
1139
1140         fe = (struct fileEntry *)bh->b_data;
1141         efe = (struct extendedFileEntry *)bh->b_data;
1142
1143         if (le16_to_cpu(fe->icbTag.strategyType) == 4)
1144                 UDF_I_STRAT4096(inode) = 0;
1145         else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
1146                 UDF_I_STRAT4096(inode) = 1;
1147
1148         UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
1149         UDF_I_UNIQUE(inode) = 0;
1150         UDF_I_LENEATTR(inode) = 0;
1151         UDF_I_LENEXTENTS(inode) = 0;
1152         UDF_I_LENALLOC(inode) = 0;
1153         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
1154         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
1155         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE)
1156         {
1157                 UDF_I_EFE(inode) = 1;
1158                 UDF_I_USE(inode) = 0;
1159                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
1160                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1161         }
1162         else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE)
1163         {
1164                 UDF_I_EFE(inode) = 0;
1165                 UDF_I_USE(inode) = 0;
1166                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
1167                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1168         }
1169         else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
1170         {
1171                 UDF_I_EFE(inode) = 0;
1172                 UDF_I_USE(inode) = 1;
1173                 UDF_I_LENALLOC(inode) =
1174                         le32_to_cpu(
1175                                 ((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
1176                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry), GFP_KERNEL);
1177                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1178                 return;
1179         }
1180
1181         inode->i_uid = le32_to_cpu(fe->uid);
1182         if (inode->i_uid == -1 || UDF_QUERY_FLAG(inode->i_sb,
1183                                         UDF_FLAG_UID_IGNORE))
1184                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1185
1186         inode->i_gid = le32_to_cpu(fe->gid);
1187         if (inode->i_gid == -1 || UDF_QUERY_FLAG(inode->i_sb,
1188                                         UDF_FLAG_GID_IGNORE))
1189                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1190
1191         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1192         if (!inode->i_nlink)
1193                 inode->i_nlink = 1;
1194
1195         inode->i_size = le64_to_cpu(fe->informationLength);
1196         UDF_I_LENEXTENTS(inode) = inode->i_size;
1197
1198         inode->i_mode = udf_convert_permissions(fe);
1199         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1200
1201         if (UDF_I_EFE(inode) == 0)
1202         {
1203                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1204                         (inode->i_sb->s_blocksize_bits - 9);
1205
1206                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1207                         lets_to_cpu(fe->accessTime)) )
1208                 {
1209                         inode->i_atime.tv_sec = convtime;
1210                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1211                 }
1212                 else
1213                 {
1214                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1215                 }
1216
1217                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1218                         lets_to_cpu(fe->modificationTime)) )
1219                 {
1220                         inode->i_mtime.tv_sec = convtime;
1221                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1222                 }
1223                 else
1224                 {
1225                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1226                 }
1227
1228                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1229                         lets_to_cpu(fe->attrTime)) )
1230                 {
1231                         inode->i_ctime.tv_sec = convtime;
1232                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1233                 }
1234                 else
1235                 {
1236                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1237                 }
1238
1239                 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
1240                 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
1241                 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
1242                 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
1243         }
1244         else
1245         {
1246                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1247                         (inode->i_sb->s_blocksize_bits - 9);
1248
1249                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1250                         lets_to_cpu(efe->accessTime)) )
1251                 {
1252                         inode->i_atime.tv_sec = convtime;
1253                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1254                 }
1255                 else
1256                 {
1257                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1258                 }
1259
1260                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1261                         lets_to_cpu(efe->modificationTime)) )
1262                 {
1263                         inode->i_mtime.tv_sec = convtime;
1264                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1265                 }
1266                 else
1267                 {
1268                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1269                 }
1270
1271                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1272                         lets_to_cpu(efe->createTime)) )
1273                 {
1274                         UDF_I_CRTIME(inode).tv_sec = convtime;
1275                         UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
1276                 }
1277                 else
1278                 {
1279                         UDF_I_CRTIME(inode) = UDF_SB_RECORDTIME(inode->i_sb);
1280                 }
1281
1282                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1283                         lets_to_cpu(efe->attrTime)) )
1284                 {
1285                         inode->i_ctime.tv_sec = convtime;
1286                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1287                 }
1288                 else
1289                 {
1290                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1291                 }
1292
1293                 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
1294                 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
1295                 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
1296                 offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
1297         }
1298
1299         switch (fe->icbTag.fileType)
1300         {
1301                 case ICBTAG_FILE_TYPE_DIRECTORY:
1302                 {
1303                         inode->i_op = &udf_dir_inode_operations;
1304                         inode->i_fop = &udf_dir_operations;
1305                         inode->i_mode |= S_IFDIR;
1306                         inc_nlink(inode);
1307                         break;
1308                 }
1309                 case ICBTAG_FILE_TYPE_REALTIME:
1310                 case ICBTAG_FILE_TYPE_REGULAR:
1311                 case ICBTAG_FILE_TYPE_UNDEF:
1312                 {
1313                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1314                                 inode->i_data.a_ops = &udf_adinicb_aops;
1315                         else
1316                                 inode->i_data.a_ops = &udf_aops;
1317                         inode->i_op = &udf_file_inode_operations;
1318                         inode->i_fop = &udf_file_operations;
1319                         inode->i_mode |= S_IFREG;
1320                         break;
1321                 }
1322                 case ICBTAG_FILE_TYPE_BLOCK:
1323                 {
1324                         inode->i_mode |= S_IFBLK;
1325                         break;
1326                 }
1327                 case ICBTAG_FILE_TYPE_CHAR:
1328                 {
1329                         inode->i_mode |= S_IFCHR;
1330                         break;
1331                 }
1332                 case ICBTAG_FILE_TYPE_FIFO:
1333                 {
1334                         init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1335                         break;
1336                 }
1337                 case ICBTAG_FILE_TYPE_SOCKET:
1338                 {
1339                         init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1340                         break;
1341                 }
1342                 case ICBTAG_FILE_TYPE_SYMLINK:
1343                 {
1344                         inode->i_data.a_ops = &udf_symlink_aops;
1345                         inode->i_op = &page_symlink_inode_operations;
1346                         inode->i_mode = S_IFLNK|S_IRWXUGO;
1347                         break;
1348                 }
1349                 default:
1350                 {
1351                         printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
1352                                 inode->i_ino, fe->icbTag.fileType);
1353                         make_bad_inode(inode);
1354                         return;
1355                 }
1356         }
1357         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1358         {
1359                 struct deviceSpec *dsea =
1360                         (struct deviceSpec *)
1361                                 udf_get_extendedattr(inode, 12, 1);
1362
1363                 if (dsea)
1364                 {
1365                         init_special_inode(inode, inode->i_mode, MKDEV(
1366                                 le32_to_cpu(dsea->majorDeviceIdent),
1367                                 le32_to_cpu(dsea->minorDeviceIdent)));
1368                         /* Developer ID ??? */
1369                 }
1370                 else
1371                 {
1372                         make_bad_inode(inode);
1373                 }
1374         }
1375 }
1376
1377 static mode_t
1378 udf_convert_permissions(struct fileEntry *fe)
1379 {
1380         mode_t mode;
1381         uint32_t permissions;
1382         uint32_t flags;
1383
1384         permissions = le32_to_cpu(fe->permissions);
1385         flags = le16_to_cpu(fe->icbTag.flags);
1386
1387         mode =  (( permissions      ) & S_IRWXO) |
1388                 (( permissions >> 2 ) & S_IRWXG) |
1389                 (( permissions >> 4 ) & S_IRWXU) |
1390                 (( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1391                 (( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1392                 (( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1393
1394         return mode;
1395 }
1396
1397 /*
1398  * udf_write_inode
1399  *
1400  * PURPOSE
1401  *      Write out the specified inode.
1402  *
1403  * DESCRIPTION
1404  *      This routine is called whenever an inode is synced.
1405  *      Currently this routine is just a placeholder.
1406  *
1407  * HISTORY
1408  *      July 1, 1997 - Andrew E. Mileski
1409  *      Written, tested, and released.
1410  */
1411
1412 int udf_write_inode(struct inode * inode, int sync)
1413 {
1414         int ret;
1415         lock_kernel();
1416         ret = udf_update_inode(inode, sync);
1417         unlock_kernel();
1418         return ret;
1419 }
1420
1421 int udf_sync_inode(struct inode * inode)
1422 {
1423         return udf_update_inode(inode, 1);
1424 }
1425
1426 static int
1427 udf_update_inode(struct inode *inode, int do_sync)
1428 {
1429         struct buffer_head *bh = NULL;
1430         struct fileEntry *fe;
1431         struct extendedFileEntry *efe;
1432         uint32_t udfperms;
1433         uint16_t icbflags;
1434         uint16_t crclen;
1435         int i;
1436         kernel_timestamp cpu_time;
1437         int err = 0;
1438
1439         bh = udf_tread(inode->i_sb,
1440                 udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));
1441
1442         if (!bh)
1443         {
1444                 udf_debug("bread failure\n");
1445                 return -EIO;
1446         }
1447
1448         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1449
1450         fe = (struct fileEntry *)bh->b_data;
1451         efe = (struct extendedFileEntry *)bh->b_data;
1452
1453         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
1454         {
1455                 struct unallocSpaceEntry *use =
1456                         (struct unallocSpaceEntry *)bh->b_data;
1457
1458                 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1459                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1460                 crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) -
1461                         sizeof(tag);
1462                 use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1463                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1464                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));
1465
1466                 use->descTag.tagChecksum = 0;
1467                 for (i=0; i<16; i++)
1468                         if (i != 4)
1469                                 use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];
1470
1471                 mark_buffer_dirty(bh);
1472                 brelse(bh);
1473                 return err;
1474         }
1475
1476         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1477                 fe->uid = cpu_to_le32(-1);
1478         else fe->uid = cpu_to_le32(inode->i_uid);
1479
1480         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1481                 fe->gid = cpu_to_le32(-1);
1482         else fe->gid = cpu_to_le32(inode->i_gid);
1483
1484         udfperms =      ((inode->i_mode & S_IRWXO)     ) |
1485                         ((inode->i_mode & S_IRWXG) << 2) |
1486                         ((inode->i_mode & S_IRWXU) << 4);
1487
1488         udfperms |=     (le32_to_cpu(fe->permissions) &
1489                         (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1490                          FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1491                          FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1492         fe->permissions = cpu_to_le32(udfperms);
1493
1494         if (S_ISDIR(inode->i_mode))
1495                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1496         else
1497                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1498
1499         fe->informationLength = cpu_to_le64(inode->i_size);
1500
1501         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1502         {
1503                 regid *eid;
1504                 struct deviceSpec *dsea =
1505                         (struct deviceSpec *)
1506                                 udf_get_extendedattr(inode, 12, 1);
1507
1508                 if (!dsea)
1509                 {
1510                         dsea = (struct deviceSpec *)
1511                                 udf_add_extendedattr(inode,
1512                                         sizeof(struct deviceSpec) +
1513                                         sizeof(regid), 12, 0x3);
1514                         dsea->attrType = cpu_to_le32(12);
1515                         dsea->attrSubtype = 1;
1516                         dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
1517                                 sizeof(regid));
1518                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1519                 }
1520                 eid = (regid *)dsea->impUse;
1521                 memset(eid, 0, sizeof(regid));
1522                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1523                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1524                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1525                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1526                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1527         }
1528
1529         if (UDF_I_EFE(inode) == 0)
1530         {
1531                 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1532                 fe->logicalBlocksRecorded = cpu_to_le64(
1533                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1534                         (inode->i_sb->s_blocksize_bits - 9));
1535
1536                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1537                         fe->accessTime = cpu_to_lets(cpu_time);
1538                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1539                         fe->modificationTime = cpu_to_lets(cpu_time);
1540                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1541                         fe->attrTime = cpu_to_lets(cpu_time);
1542                 memset(&(fe->impIdent), 0, sizeof(regid));
1543                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1544                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1545                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1546                 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1547                 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1548                 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1549                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1550                 crclen = sizeof(struct fileEntry);
1551         }
1552         else
1553         {
1554                 memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1555                 efe->objectSize = cpu_to_le64(inode->i_size);
1556                 efe->logicalBlocksRecorded = cpu_to_le64(
1557                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1558                         (inode->i_sb->s_blocksize_bits - 9));
1559
1560                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
1561                         (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
1562                          UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec))
1563                 {
1564                         UDF_I_CRTIME(inode) = inode->i_atime;
1565                 }
1566                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
1567                         (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
1568                          UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec))
1569                 {
1570                         UDF_I_CRTIME(inode) = inode->i_mtime;
1571                 }
1572                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
1573                         (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
1574                          UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec))
1575                 {
1576                         UDF_I_CRTIME(inode) = inode->i_ctime;
1577                 }
1578
1579                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1580                         efe->accessTime = cpu_to_lets(cpu_time);
1581                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1582                         efe->modificationTime = cpu_to_lets(cpu_time);
1583                 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
1584                         efe->createTime = cpu_to_lets(cpu_time);
1585                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1586                         efe->attrTime = cpu_to_lets(cpu_time);
1587
1588                 memset(&(efe->impIdent), 0, sizeof(regid));
1589                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1590                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1591                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1592                 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1593                 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1594                 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1595                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1596                 crclen = sizeof(struct extendedFileEntry);
1597         }
1598         if (UDF_I_STRAT4096(inode))
1599         {
1600                 fe->icbTag.strategyType = cpu_to_le16(4096);
1601                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1602                 fe->icbTag.numEntries = cpu_to_le16(2);
1603         }
1604         else
1605         {
1606                 fe->icbTag.strategyType = cpu_to_le16(4);
1607                 fe->icbTag.numEntries = cpu_to_le16(1);
1608         }
1609
1610         if (S_ISDIR(inode->i_mode))
1611                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1612         else if (S_ISREG(inode->i_mode))
1613                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1614         else if (S_ISLNK(inode->i_mode))
1615                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1616         else if (S_ISBLK(inode->i_mode))
1617                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1618         else if (S_ISCHR(inode->i_mode))
1619                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1620         else if (S_ISFIFO(inode->i_mode))
1621                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1622         else if (S_ISSOCK(inode->i_mode))
1623                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1624
1625         icbflags =      UDF_I_ALLOCTYPE(inode) |
1626                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1627                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1628                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1629                         (le16_to_cpu(fe->icbTag.flags) &
1630                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1631                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1632
1633         fe->icbTag.flags = cpu_to_le16(icbflags);
1634         if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1635                 fe->descTag.descVersion = cpu_to_le16(3);
1636         else
1637                 fe->descTag.descVersion = cpu_to_le16(2);
1638         fe->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
1639         fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1640         crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
1641         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1642         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));
1643
1644         fe->descTag.tagChecksum = 0;
1645         for (i=0; i<16; i++)
1646                 if (i != 4)
1647                         fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];
1648
1649         /* write the data blocks */
1650         mark_buffer_dirty(bh);
1651         if (do_sync)
1652         {
1653                 sync_dirty_buffer(bh);
1654                 if (buffer_req(bh) && !buffer_uptodate(bh))
1655                 {
1656                         printk("IO error syncing udf inode [%s:%08lx]\n",
1657                                 inode->i_sb->s_id, inode->i_ino);
1658                         err = -EIO;
1659                 }
1660         }
1661         brelse(bh);
1662         return err;
1663 }
1664
1665 struct inode *
1666 udf_iget(struct super_block *sb, kernel_lb_addr ino)
1667 {
1668         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1669         struct inode *inode = iget_locked(sb, block);
1670
1671         if (!inode)
1672                 return NULL;
1673
1674         if (inode->i_state & I_NEW) {
1675                 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
1676                 __udf_read_inode(inode);
1677                 unlock_new_inode(inode);
1678         }
1679
1680         if (is_bad_inode(inode))
1681                 goto out_iput;
1682
1683         if (ino.logicalBlockNum >= UDF_SB_PARTLEN(sb, ino.partitionReferenceNum)) {
1684                 udf_debug("block=%d, partition=%d out of range\n",
1685                         ino.logicalBlockNum, ino.partitionReferenceNum);
1686                 make_bad_inode(inode);
1687                 goto out_iput;
1688         }
1689
1690         return inode;
1691
1692  out_iput:
1693         iput(inode);
1694         return NULL;
1695 }
1696
1697 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1698         kernel_lb_addr eloc, uint32_t elen, int inc)
1699 {
1700         int adsize;
1701         short_ad *sad = NULL;
1702         long_ad *lad = NULL;
1703         struct allocExtDesc *aed;
1704         int8_t etype;
1705         uint8_t *ptr;
1706
1707         if (!epos->bh)
1708                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1709         else
1710                 ptr = epos->bh->b_data + epos->offset;
1711
1712         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1713                 adsize = sizeof(short_ad);
1714         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1715                 adsize = sizeof(long_ad);
1716         else
1717                 return -1;
1718
1719         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize)
1720         {
1721                 char *sptr, *dptr;
1722                 struct buffer_head *nbh;
1723                 int err, loffset;
1724                 kernel_lb_addr obloc = epos->block;
1725
1726                 if (!(epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1727                         obloc.partitionReferenceNum, obloc.logicalBlockNum, &err)))
1728                 {
1729                         return -1;
1730                 }
1731                 if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1732                         epos->block, 0))))
1733                 {
1734                         return -1;
1735                 }
1736                 lock_buffer(nbh);
1737                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1738                 set_buffer_uptodate(nbh);
1739                 unlock_buffer(nbh);
1740                 mark_buffer_dirty_inode(nbh, inode);
1741
1742                 aed = (struct allocExtDesc *)(nbh->b_data);
1743                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1744                         aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
1745                 if (epos->offset + adsize > inode->i_sb->s_blocksize)
1746                 {
1747                         loffset = epos->offset;
1748                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1749                         sptr = ptr - adsize;
1750                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1751                         memcpy(dptr, sptr, adsize);
1752                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1753                 }
1754                 else
1755                 {
1756                         loffset = epos->offset + adsize;
1757                         aed->lengthAllocDescs = cpu_to_le32(0);
1758                         sptr = ptr;
1759                         epos->offset = sizeof(struct allocExtDesc);
1760
1761                         if (epos->bh)
1762                         {
1763                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1764                                 aed->lengthAllocDescs =
1765                                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1766                         }
1767                         else
1768                         {
1769                                 UDF_I_LENALLOC(inode) += adsize;
1770                                 mark_inode_dirty(inode);
1771                         }
1772                 }
1773                 if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1774                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1775                                 epos->block.logicalBlockNum, sizeof(tag));
1776                 else
1777                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1778                                 epos->block.logicalBlockNum, sizeof(tag));
1779                 switch (UDF_I_ALLOCTYPE(inode))
1780                 {
1781                         case ICBTAG_FLAG_AD_SHORT:
1782                         {
1783                                 sad = (short_ad *)sptr;
1784                                 sad->extLength = cpu_to_le32(
1785                                         EXT_NEXT_EXTENT_ALLOCDECS |
1786                                         inode->i_sb->s_blocksize);
1787                                 sad->extPosition = cpu_to_le32(epos->block.logicalBlockNum);
1788                                 break;
1789                         }
1790                         case ICBTAG_FLAG_AD_LONG:
1791                         {
1792                                 lad = (long_ad *)sptr;
1793                                 lad->extLength = cpu_to_le32(
1794                                         EXT_NEXT_EXTENT_ALLOCDECS |
1795                                         inode->i_sb->s_blocksize);
1796                                 lad->extLocation = cpu_to_lelb(epos->block);
1797                                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1798                                 break;
1799                         }
1800                 }
1801                 if (epos->bh)
1802                 {
1803                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1804                                 udf_update_tag(epos->bh->b_data, loffset);
1805                         else
1806                                 udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
1807                         mark_buffer_dirty_inode(epos->bh, inode);
1808                         brelse(epos->bh);
1809                 }
1810                 else
1811                         mark_inode_dirty(inode);
1812                 epos->bh = nbh;
1813         }
1814
1815         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1816
1817         if (!epos->bh)
1818         {
1819                 UDF_I_LENALLOC(inode) += adsize;
1820                 mark_inode_dirty(inode);
1821         }
1822         else
1823         {
1824                 aed = (struct allocExtDesc *)epos->bh->b_data;
1825                 aed->lengthAllocDescs =
1826                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1827                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1828                         udf_update_tag(epos->bh->b_data, epos->offset + (inc ? 0 : adsize));
1829                 else
1830                         udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
1831                 mark_buffer_dirty_inode(epos->bh, inode);
1832         }
1833
1834         return etype;
1835 }
1836
1837 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1838     kernel_lb_addr eloc, uint32_t elen, int inc)
1839 {
1840         int adsize;
1841         uint8_t *ptr;
1842
1843         if (!epos->bh)
1844                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1845         else
1846                 ptr = epos->bh->b_data + epos->offset;
1847
1848         switch (UDF_I_ALLOCTYPE(inode))
1849         {
1850                 case ICBTAG_FLAG_AD_SHORT:
1851                 {
1852                         short_ad *sad = (short_ad *)ptr;
1853                         sad->extLength = cpu_to_le32(elen);
1854                         sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1855                         adsize = sizeof(short_ad);
1856                         break;
1857                 }
1858                 case ICBTAG_FLAG_AD_LONG:
1859                 {
1860                         long_ad *lad = (long_ad *)ptr;
1861                         lad->extLength = cpu_to_le32(elen);
1862                         lad->extLocation = cpu_to_lelb(eloc);
1863                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1864                         adsize = sizeof(long_ad);
1865                         break;
1866                 }
1867                 default:
1868                         return -1;
1869         }
1870
1871         if (epos->bh)
1872         {
1873                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1874                 {
1875                         struct allocExtDesc *aed = (struct allocExtDesc *)epos->bh->b_data;
1876                         udf_update_tag(epos->bh->b_data,
1877                                 le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc));
1878                 }
1879                 mark_buffer_dirty_inode(epos->bh, inode);
1880         }
1881         else
1882                 mark_inode_dirty(inode);
1883
1884         if (inc)
1885                 epos->offset += adsize;
1886         return (elen >> 30);
1887 }
1888
1889 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1890         kernel_lb_addr *eloc, uint32_t *elen, int inc)
1891 {
1892         int8_t etype;
1893
1894         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1895                 (EXT_NEXT_EXTENT_ALLOCDECS >> 30))
1896         {
1897                 epos->block = *eloc;
1898                 epos->offset = sizeof(struct allocExtDesc);
1899                 brelse(epos->bh);
1900                 if (!(epos->bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, epos->block, 0))))
1901                 {
1902                         udf_debug("reading block %d failed!\n",
1903                                 udf_get_lb_pblock(inode->i_sb, epos->block, 0));
1904                         return -1;
1905                 }
1906         }
1907
1908         return etype;
1909 }
1910
1911 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1912         kernel_lb_addr *eloc, uint32_t *elen, int inc)
1913 {
1914         int alen;
1915         int8_t etype;
1916         uint8_t *ptr;
1917
1918         if (!epos->bh)
1919         {
1920                 if (!epos->offset)
1921                         epos->offset = udf_file_entry_alloc_offset(inode);
1922                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1923                 alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode);
1924         }
1925         else
1926         {
1927                 if (!epos->offset)
1928                         epos->offset = sizeof(struct allocExtDesc);
1929                 ptr = epos->bh->b_data + epos->offset;
1930                 alen = sizeof(struct allocExtDesc) + le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->lengthAllocDescs);
1931         }
1932
1933         switch (UDF_I_ALLOCTYPE(inode))
1934         {
1935                 case ICBTAG_FLAG_AD_SHORT:
1936                 {
1937                         short_ad *sad;
1938
1939                         if (!(sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc)))
1940                                 return -1;
1941
1942                         etype = le32_to_cpu(sad->extLength) >> 30;
1943                         eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1944                         eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
1945                         *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1946                         break;
1947                 }
1948                 case ICBTAG_FLAG_AD_LONG:
1949                 {
1950                         long_ad *lad;
1951
1952                         if (!(lad = udf_get_filelongad(ptr, alen, &epos->offset, inc)))
1953                                 return -1;
1954
1955                         etype = le32_to_cpu(lad->extLength) >> 30;
1956                         *eloc = lelb_to_cpu(lad->extLocation);
1957                         *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1958                         break;
1959                 }
1960                 default:
1961                 {
1962                         udf_debug("alloc_type = %d unsupported\n", UDF_I_ALLOCTYPE(inode));
1963                         return -1;
1964                 }
1965         }
1966
1967         return etype;
1968 }
1969
1970 static int8_t
1971 udf_insert_aext(struct inode *inode, struct extent_position epos,
1972                 kernel_lb_addr neloc, uint32_t nelen)
1973 {
1974         kernel_lb_addr oeloc;
1975         uint32_t oelen;
1976         int8_t etype;
1977
1978         if (epos.bh)
1979                 get_bh(epos.bh);
1980
1981         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1)
1982         {
1983                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1984
1985                 neloc = oeloc;
1986                 nelen = (etype << 30) | oelen;
1987         }
1988         udf_add_aext(inode, &epos, neloc, nelen, 1);
1989         brelse(epos.bh);
1990         return (nelen >> 30);
1991 }
1992
1993 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1994         kernel_lb_addr eloc, uint32_t elen)
1995 {
1996         struct extent_position oepos;
1997         int adsize;
1998         int8_t etype;
1999         struct allocExtDesc *aed;
2000
2001         if (epos.bh)
2002         {
2003                 get_bh(epos.bh);
2004                 get_bh(epos.bh);
2005         }
2006
2007         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
2008                 adsize = sizeof(short_ad);
2009         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
2010                 adsize = sizeof(long_ad);
2011         else
2012                 adsize = 0;
2013
2014         oepos = epos;
2015         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2016                 return -1;
2017
2018         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1)
2019         {
2020                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
2021                 if (oepos.bh != epos.bh)
2022                 {
2023                         oepos.block = epos.block;
2024                         brelse(oepos.bh);
2025                         get_bh(epos.bh);
2026                         oepos.bh = epos.bh;
2027                         oepos.offset = epos.offset - adsize;
2028                 }
2029         }
2030         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
2031         elen = 0;
2032
2033         if (epos.bh != oepos.bh)
2034         {
2035                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
2036                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2037                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2038                 if (!oepos.bh)
2039                 {
2040                         UDF_I_LENALLOC(inode) -= (adsize * 2);
2041                         mark_inode_dirty(inode);
2042                 }
2043                 else
2044                 {
2045                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2046                         aed->lengthAllocDescs =
2047                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2*adsize));
2048                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
2049                                 udf_update_tag(oepos.bh->b_data, oepos.offset - (2*adsize));
2050                         else
2051                                 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
2052                         mark_buffer_dirty_inode(oepos.bh, inode);
2053                 }
2054         }
2055         else
2056         {
2057                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2058                 if (!oepos.bh)
2059                 {
2060                         UDF_I_LENALLOC(inode) -= adsize;
2061                         mark_inode_dirty(inode);
2062                 }
2063                 else
2064                 {
2065                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2066                         aed->lengthAllocDescs =
2067                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize);
2068                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
2069                                 udf_update_tag(oepos.bh->b_data, epos.offset - adsize);
2070                         else
2071                                 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
2072                         mark_buffer_dirty_inode(oepos.bh, inode);
2073                 }
2074         }
2075
2076         brelse(epos.bh);
2077         brelse(oepos.bh);
2078         return (elen >> 30);
2079 }
2080
2081 int8_t inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos,
2082         kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset)
2083 {
2084         loff_t lbcount = 0, bcount = (loff_t)block << inode->i_sb->s_blocksize_bits;
2085         int8_t etype;
2086
2087         if (block < 0)
2088         {
2089                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
2090                 return -1;
2091         }
2092
2093         pos->offset = 0;
2094         pos->block = UDF_I_LOCATION(inode);
2095         pos->bh = NULL;
2096         *elen = 0;
2097
2098         do
2099         {
2100                 if ((etype = udf_next_aext(inode, pos, eloc, elen, 1)) == -1)
2101                 {
2102                         *offset = (bcount - lbcount) >> inode->i_sb->s_blocksize_bits;
2103                         UDF_I_LENEXTENTS(inode) = lbcount;
2104                         return -1;
2105                 }
2106                 lbcount += *elen;
2107         } while (lbcount <= bcount);
2108
2109         *offset = (bcount + *elen - lbcount) >> inode->i_sb->s_blocksize_bits;
2110
2111         return etype;
2112 }
2113
2114 long udf_block_map(struct inode *inode, sector_t block)
2115 {
2116         kernel_lb_addr eloc;
2117         uint32_t elen;
2118         sector_t offset;
2119         struct extent_position epos = { NULL, 0, { 0, 0}};
2120         int ret;
2121
2122         lock_kernel();
2123
2124         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
2125                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2126         else
2127                 ret = 0;
2128
2129         unlock_kernel();
2130         brelse(epos.bh);
2131
2132         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2133                 return udf_fixed_to_variable(ret);
2134         else
2135                 return ret;
2136 }