fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/module.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/buffer_head.h>
  38 #include <linux/writeback.h>
  39 #include <linux/slab.h>
  40 #include <linux/crc-itu-t.h>
  41
  42 #include "udf_i.h"
  43 #include "udf_sb.h"
  44
  45 MODULE_AUTHOR("Ben Fennema");
  46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  47 MODULE_LICENSE("GPL");
  48
  49 #define EXTENT_MERGE_SIZE 5
  50
  51 static mode_t udf_convert_permissions(struct fileEntry *);
  52 static int udf_update_inode(struct inode *, int);
  53 static void udf_fill_inode(struct inode *, struct buffer_head *);
  54 static int udf_alloc_i_data(struct inode *inode, size_t size);
  55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  56                                         sector_t *, int *);
  57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  58                               struct kernel_lb_addr, uint32_t);
  59 static void udf_split_extents(struct inode *, int *, int, int,
  60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_prealloc_extents(struct inode *, int, int,
  62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_merge_extents(struct inode *,
  64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  65 static void udf_update_extents(struct inode *,
  66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  67                                struct extent_position *);
  68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  69
  70
  71 void udf_delete_inode(struct inode *inode)
  72 {
  73         truncate_inode_pages(&inode->i_data, 0);
  74
  75         if (is_bad_inode(inode))
  76                 goto no_delete;
  77
  78         inode->i_size = 0;
  79         udf_truncate(inode);
  80         lock_kernel();
  81
  82         udf_update_inode(inode, IS_SYNC(inode));
  83         udf_free_inode(inode);
  84
  85         unlock_kernel();
  86         return;
  87
  88 no_delete:
  89         clear_inode(inode);
  90 }
  91
  92 /*
  93  * If we are going to release inode from memory, we truncate last inode extent
  94  * to proper length. We could use drop_inode() but it's called under inode_lock
  95  * and thus we cannot mark inode dirty there.  We use clear_inode() but we have
  96  * to make sure to write inode as it's not written automatically.
  97  */
  98 void udf_clear_inode(struct inode *inode)
  99 {
 100         struct udf_inode_info *iinfo = UDF_I(inode);
 101
 102         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 103             inode->i_size != iinfo->i_lenExtents) {
 104                 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
 105                         "inode size %llu different from extent length %llu. "
 106                         "Filesystem need not be standards compliant.\n",
 107                         inode->i_sb->s_id, inode->i_ino, inode->i_mode,
 108                         (unsigned long long)inode->i_size,
 109                         (unsigned long long)iinfo->i_lenExtents);
 110         }
 111
 112         kfree(iinfo->i_ext.i_data);
 113         iinfo->i_ext.i_data = NULL;
 114 }
 115
 116 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 117 {
 118         return block_write_full_page(page, udf_get_block, wbc);
 119 }
 120
 121 static int udf_readpage(struct file *file, struct page *page)
 122 {
 123         return block_read_full_page(page, udf_get_block);
 124 }
 125
 126 static int udf_write_begin(struct file *file, struct address_space *mapping,
 127                         loff_t pos, unsigned len, unsigned flags,
 128                         struct page **pagep, void **fsdata)
 129 {
 130         *pagep = NULL;
 131         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 132                                 udf_get_block);
 133 }
 134
 135 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 136 {
 137         return generic_block_bmap(mapping, block, udf_get_block);
 138 }
 139
 140 const struct address_space_operations udf_aops = {
 141         .readpage       = udf_readpage,
 142         .writepage      = udf_writepage,
 143         .sync_page      = block_sync_page,
 144         .write_begin            = udf_write_begin,
 145         .write_end              = generic_write_end,
 146         .bmap           = udf_bmap,
 147 };
 148
 149 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 150 {
 151         struct page *page;
 152         char *kaddr;
 153         struct udf_inode_info *iinfo = UDF_I(inode);
 154         struct writeback_control udf_wbc = {
 155                 .sync_mode = WB_SYNC_NONE,
 156                 .nr_to_write = 1,
 157         };
 158
 159         /* from now on we have normal address_space methods */
 160         inode->i_data.a_ops = &udf_aops;
 161
 162         if (!iinfo->i_lenAlloc) {
 163                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 164                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 165                 else
 166                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 167                 mark_inode_dirty(inode);
 168                 return;
 169         }
 170
 171         page = grab_cache_page(inode->i_mapping, 0);
 172         BUG_ON(!PageLocked(page));
 173
 174         if (!PageUptodate(page)) {
 175                 kaddr = kmap(page);
 176                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 177                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 178                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 179                         iinfo->i_lenAlloc);
 180                 flush_dcache_page(page);
 181                 SetPageUptodate(page);
 182                 kunmap(page);
 183         }
 184         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 185                iinfo->i_lenAlloc);
 186         iinfo->i_lenAlloc = 0;
 187         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 188                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 189         else
 190                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 191
 192         inode->i_data.a_ops->writepage(page, &udf_wbc);
 193         page_cache_release(page);
 194
 195         mark_inode_dirty(inode);
 196 }
 197
 198 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 199                                            int *err)
 200 {
 201         int newblock;
 202         struct buffer_head *dbh = NULL;
 203         struct kernel_lb_addr eloc;
 204         uint8_t alloctype;
 205         struct extent_position epos;
 206
 207         struct udf_fileident_bh sfibh, dfibh;
 208         loff_t f_pos = udf_ext0_offset(inode);
 209         int size = udf_ext0_offset(inode) + inode->i_size;
 210         struct fileIdentDesc cfi, *sfi, *dfi;
 211         struct udf_inode_info *iinfo = UDF_I(inode);
 212
 213         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 214                 alloctype = ICBTAG_FLAG_AD_SHORT;
 215         else
 216                 alloctype = ICBTAG_FLAG_AD_LONG;
 217
 218         if (!inode->i_size) {
 219                 iinfo->i_alloc_type = alloctype;
 220                 mark_inode_dirty(inode);
 221                 return NULL;
 222         }
 223
 224         /* alloc block, and copy data to it */
 225         *block = udf_new_block(inode->i_sb, inode,
 226                                iinfo->i_location.partitionReferenceNum,
 227                                iinfo->i_location.logicalBlockNum, err);
 228         if (!(*block))
 229                 return NULL;
 230         newblock = udf_get_pblock(inode->i_sb, *block,
 231                                   iinfo->i_location.partitionReferenceNum,
 232                                 0);
 233         if (!newblock)
 234                 return NULL;
 235         dbh = udf_tgetblk(inode->i_sb, newblock);
 236         if (!dbh)
 237                 return NULL;
 238         lock_buffer(dbh);
 239         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 240         set_buffer_uptodate(dbh);
 241         unlock_buffer(dbh);
 242         mark_buffer_dirty_inode(dbh, inode);
 243
 244         sfibh.soffset = sfibh.eoffset =
 245                         f_pos & (inode->i_sb->s_blocksize - 1);
 246         sfibh.sbh = sfibh.ebh = NULL;
 247         dfibh.soffset = dfibh.eoffset = 0;
 248         dfibh.sbh = dfibh.ebh = dbh;
 249         while (f_pos < size) {
 250                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 251                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 252                                          NULL, NULL, NULL);
 253                 if (!sfi) {
 254                         brelse(dbh);
 255                         return NULL;
 256                 }
 257                 iinfo->i_alloc_type = alloctype;
 258                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 259                 dfibh.soffset = dfibh.eoffset;
 260                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 261                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 262                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 263                                  sfi->fileIdent +
 264                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 265                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 266                         brelse(dbh);
 267                         return NULL;
 268                 }
 269         }
 270         mark_buffer_dirty_inode(dbh, inode);
 271
 272         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 273                 iinfo->i_lenAlloc);
 274         iinfo->i_lenAlloc = 0;
 275         eloc.logicalBlockNum = *block;
 276         eloc.partitionReferenceNum =
 277                                 iinfo->i_location.partitionReferenceNum;
 278         iinfo->i_lenExtents = inode->i_size;
 279         epos.bh = NULL;
 280         epos.block = iinfo->i_location;
 281         epos.offset = udf_file_entry_alloc_offset(inode);
 282         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 283         /* UniqueID stuff */
 284
 285         brelse(epos.bh);
 286         mark_inode_dirty(inode);
 287         return dbh;
 288 }
 289
 290 static int udf_get_block(struct inode *inode, sector_t block,
 291                          struct buffer_head *bh_result, int create)
 292 {
 293         int err, new;
 294         struct buffer_head *bh;
 295         sector_t phys = 0;
 296         struct udf_inode_info *iinfo;
 297
 298         if (!create) {
 299                 phys = udf_block_map(inode, block);
 300                 if (phys)
 301                         map_bh(bh_result, inode->i_sb, phys);
 302                 return 0;
 303         }
 304
 305         err = -EIO;
 306         new = 0;
 307         bh = NULL;
 308
 309         lock_kernel();
 310
 311         iinfo = UDF_I(inode);
 312         if (block == iinfo->i_next_alloc_block + 1) {
 313                 iinfo->i_next_alloc_block++;
 314                 iinfo->i_next_alloc_goal++;
 315         }
 316
 317         err = 0;
 318
 319         bh = inode_getblk(inode, block, &err, &phys, &new);
 320         BUG_ON(bh);
 321         if (err)
 322                 goto abort;
 323         BUG_ON(!phys);
 324
 325         if (new)
 326                 set_buffer_new(bh_result);
 327         map_bh(bh_result, inode->i_sb, phys);
 328
 329 abort:
 330         unlock_kernel();
 331         return err;
 332 }
 333
 334 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 335                                       int create, int *err)
 336 {
 337         struct buffer_head *bh;
 338         struct buffer_head dummy;
 339
 340         dummy.b_state = 0;
 341         dummy.b_blocknr = -1000;
 342         *err = udf_get_block(inode, block, &dummy, create);
 343         if (!*err && buffer_mapped(&dummy)) {
 344                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 345                 if (buffer_new(&dummy)) {
 346                         lock_buffer(bh);
 347                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 348                         set_buffer_uptodate(bh);
 349                         unlock_buffer(bh);
 350                         mark_buffer_dirty_inode(bh, inode);
 351                 }
 352                 return bh;
 353         }
 354
 355         return NULL;
 356 }
 357
 358 /* Extend the file by 'blocks' blocks, return the number of extents added */
 359 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 360                     struct kernel_long_ad *last_ext, sector_t blocks)
 361 {
 362         sector_t add;
 363         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 364         struct super_block *sb = inode->i_sb;
 365         struct kernel_lb_addr prealloc_loc = {};
 366         int prealloc_len = 0;
 367         struct udf_inode_info *iinfo;
 368
 369         /* The previous extent is fake and we should not extend by anything
 370          * - there's nothing to do... */
 371         if (!blocks && fake)
 372                 return 0;
 373
 374         iinfo = UDF_I(inode);
 375         /* Round the last extent up to a multiple of block size */
 376         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 377                 last_ext->extLength =
 378                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 379                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 380                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 381                 iinfo->i_lenExtents =
 382                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 383                         ~(sb->s_blocksize - 1);
 384         }
 385
 386         /* Last extent are just preallocated blocks? */
 387         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 388                                                 EXT_NOT_RECORDED_ALLOCATED) {
 389                 /* Save the extent so that we can reattach it to the end */
 390                 prealloc_loc = last_ext->extLocation;
 391                 prealloc_len = last_ext->extLength;
 392                 /* Mark the extent as a hole */
 393                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 394                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 395                 last_ext->extLocation.logicalBlockNum = 0;
 396                 last_ext->extLocation.partitionReferenceNum = 0;
 397         }
 398
 399         /* Can we merge with the previous extent? */
 400         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 401                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 402                 add = ((1 << 30) - sb->s_blocksize -
 403                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 404                         sb->s_blocksize_bits;
 405                 if (add > blocks)
 406                         add = blocks;
 407                 blocks -= add;
 408                 last_ext->extLength += add << sb->s_blocksize_bits;
 409         }
 410
 411         if (fake) {
 412                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 413                              last_ext->extLength, 1);
 414                 count++;
 415         } else
 416                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 417                                 last_ext->extLength, 1);
 418
 419         /* Managed to do everything necessary? */
 420         if (!blocks)
 421                 goto out;
 422
 423         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 424         last_ext->extLocation.logicalBlockNum = 0;
 425         last_ext->extLocation.partitionReferenceNum = 0;
 426         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 427         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 428                                 (add << sb->s_blocksize_bits);
 429
 430         /* Create enough extents to cover the whole hole */
 431         while (blocks > add) {
 432                 blocks -= add;
 433                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
 434                                  last_ext->extLength, 1) == -1)
 435                         return -1;
 436                 count++;
 437         }
 438         if (blocks) {
 439                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 440                         (blocks << sb->s_blocksize_bits);
 441                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
 442                                  last_ext->extLength, 1) == -1)
 443                         return -1;
 444                 count++;
 445         }
 446
 447 out:
 448         /* Do we have some preallocated blocks saved? */
 449         if (prealloc_len) {
 450                 if (udf_add_aext(inode, last_pos, &prealloc_loc,
 451                                  prealloc_len, 1) == -1)
 452                         return -1;
 453                 last_ext->extLocation = prealloc_loc;
 454                 last_ext->extLength = prealloc_len;
 455                 count++;
 456         }
 457
 458         /* last_pos should point to the last written extent... */
 459         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 460                 last_pos->offset -= sizeof(struct short_ad);
 461         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 462                 last_pos->offset -= sizeof(struct long_ad);
 463         else
 464                 return -1;
 465
 466         return count;
 467 }
 468
 469 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 470                                         int *err, sector_t *phys, int *new)
 471 {
 472         static sector_t last_block;
 473         struct buffer_head *result = NULL;
 474         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 475         struct extent_position prev_epos, cur_epos, next_epos;
 476         int count = 0, startnum = 0, endnum = 0;
 477         uint32_t elen = 0, tmpelen;
 478         struct kernel_lb_addr eloc, tmpeloc;
 479         int c = 1;
 480         loff_t lbcount = 0, b_off = 0;
 481         uint32_t newblocknum, newblock;
 482         sector_t offset = 0;
 483         int8_t etype;
 484         struct udf_inode_info *iinfo = UDF_I(inode);
 485         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 486         int lastblock = 0;
 487
 488         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 489         prev_epos.block = iinfo->i_location;
 490         prev_epos.bh = NULL;
 491         cur_epos = next_epos = prev_epos;
 492         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 493
 494         /* find the extent which contains the block we are looking for.
 495            alternate between laarr[0] and laarr[1] for locations of the
 496            current extent, and the previous extent */
 497         do {
 498                 if (prev_epos.bh != cur_epos.bh) {
 499                         brelse(prev_epos.bh);
 500                         get_bh(cur_epos.bh);
 501                         prev_epos.bh = cur_epos.bh;
 502                 }
 503                 if (cur_epos.bh != next_epos.bh) {
 504                         brelse(cur_epos.bh);
 505                         get_bh(next_epos.bh);
 506                         cur_epos.bh = next_epos.bh;
 507                 }
 508
 509                 lbcount += elen;
 510
 511                 prev_epos.block = cur_epos.block;
 512                 cur_epos.block = next_epos.block;
 513
 514                 prev_epos.offset = cur_epos.offset;
 515                 cur_epos.offset = next_epos.offset;
 516
 517                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 518                 if (etype == -1)
 519                         break;
 520
 521                 c = !c;
 522
 523                 laarr[c].extLength = (etype << 30) | elen;
 524                 laarr[c].extLocation = eloc;
 525
 526                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 527                         pgoal = eloc.logicalBlockNum +
 528                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 529                                  inode->i_sb->s_blocksize_bits);
 530
 531                 count++;
 532         } while (lbcount + elen <= b_off);
 533
 534         b_off -= lbcount;
 535         offset = b_off >> inode->i_sb->s_blocksize_bits;
 536         /*
 537          * Move prev_epos and cur_epos into indirect extent if we are at
 538          * the pointer to it
 539          */
 540         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 541         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 542
 543         /* if the extent is allocated and recorded, return the block
 544            if the extent is not a multiple of the blocksize, round up */
 545
 546         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 547                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 548                         elen = EXT_RECORDED_ALLOCATED |
 549                                 ((elen + inode->i_sb->s_blocksize - 1) &
 550                                  ~(inode->i_sb->s_blocksize - 1));
 551                         etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 552                 }
 553                 brelse(prev_epos.bh);
 554                 brelse(cur_epos.bh);
 555                 brelse(next_epos.bh);
 556                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 557                 *phys = newblock;
 558                 return NULL;
 559         }
 560
 561         last_block = block;
 562         /* Are we beyond EOF? */
 563         if (etype == -1) {
 564                 int ret;
 565
 566                 if (count) {
 567                         if (c)
 568                                 laarr[0] = laarr[1];
 569                         startnum = 1;
 570                 } else {
 571                         /* Create a fake extent when there's not one */
 572                         memset(&laarr[0].extLocation, 0x00,
 573                                 sizeof(struct kernel_lb_addr));
 574                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 575                         /* Will udf_extend_file() create real extent from
 576                            a fake one? */
 577                         startnum = (offset > 0);
 578                 }
 579                 /* Create extents for the hole between EOF and offset */
 580                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 581                 if (ret == -1) {
 582                         brelse(prev_epos.bh);
 583                         brelse(cur_epos.bh);
 584                         brelse(next_epos.bh);
 585                         /* We don't really know the error here so we just make
 586                          * something up */
 587                         *err = -ENOSPC;
 588                         return NULL;
 589                 }
 590                 c = 0;
 591                 offset = 0;
 592                 count += ret;
 593                 /* We are not covered by a preallocated extent? */
 594                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 595                                                 EXT_NOT_RECORDED_ALLOCATED) {
 596                         /* Is there any real extent? - otherwise we overwrite
 597                          * the fake one... */
 598                         if (count)
 599                                 c = !c;
 600                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 601                                 inode->i_sb->s_blocksize;
 602                         memset(&laarr[c].extLocation, 0x00,
 603                                 sizeof(struct kernel_lb_addr));
 604                         count++;
 605                         endnum++;
 606                 }
 607                 endnum = c + 1;
 608                 lastblock = 1;
 609         } else {
 610                 endnum = startnum = ((count > 2) ? 2 : count);
 611
 612                 /* if the current extent is in position 0,
 613                    swap it with the previous */
 614                 if (!c && count != 1) {
 615                         laarr[2] = laarr[0];
 616                         laarr[0] = laarr[1];
 617                         laarr[1] = laarr[2];
 618                         c = 1;
 619                 }
 620
 621                 /* if the current block is located in an extent,
 622                    read the next extent */
 623                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 624                 if (etype != -1) {
 625                         laarr[c + 1].extLength = (etype << 30) | elen;
 626                         laarr[c + 1].extLocation = eloc;
 627                         count++;
 628                         startnum++;
 629                         endnum++;
 630                 } else
 631                         lastblock = 1;
 632         }
 633
 634         /* if the current extent is not recorded but allocated, get the
 635          * block in the extent corresponding to the requested block */
 636         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 637                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 638         else { /* otherwise, allocate a new block */
 639                 if (iinfo->i_next_alloc_block == block)
 640                         goal = iinfo->i_next_alloc_goal;
 641
 642                 if (!goal) {
 643                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 644                                 goal = iinfo->i_location.logicalBlockNum + 1;
 645                 }
 646
 647                 newblocknum = udf_new_block(inode->i_sb, inode,
 648                                 iinfo->i_location.partitionReferenceNum,
 649                                 goal, err);
 650                 if (!newblocknum) {
 651                         brelse(prev_epos.bh);
 652                         *err = -ENOSPC;
 653                         return NULL;
 654                 }
 655                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 656         }
 657
 658         /* if the extent the requsted block is located in contains multiple
 659          * blocks, split the extent into at most three extents. blocks prior
 660          * to requested block, requested block, and blocks after requested
 661          * block */
 662         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 663
 664 #ifdef UDF_PREALLOCATE
 665         /* We preallocate blocks only for regular files. It also makes sense
 666          * for directories but there's a problem when to drop the
 667          * preallocation. We might use some delayed work for that but I feel
 668          * it's overengineering for a filesystem like UDF. */
 669         if (S_ISREG(inode->i_mode))
 670                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 671 #endif
 672
 673         /* merge any continuous blocks in laarr */
 674         udf_merge_extents(inode, laarr, &endnum);
 675
 676         /* write back the new extents, inserting new extents if the new number
 677          * of extents is greater than the old number, and deleting extents if
 678          * the new number of extents is less than the old number */
 679         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 680
 681         brelse(prev_epos.bh);
 682
 683         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 684                                 iinfo->i_location.partitionReferenceNum, 0);
 685         if (!newblock)
 686                 return NULL;
 687         *phys = newblock;
 688         *err = 0;
 689         *new = 1;
 690         iinfo->i_next_alloc_block = block;
 691         iinfo->i_next_alloc_goal = newblocknum;
 692         inode->i_ctime = current_fs_time(inode->i_sb);
 693
 694         if (IS_SYNC(inode))
 695                 udf_sync_inode(inode);
 696         else
 697                 mark_inode_dirty(inode);
 698
 699         return result;
 700 }
 701
 702 static void udf_split_extents(struct inode *inode, int *c, int offset,
 703                               int newblocknum,
 704                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 705                               int *endnum)
 706 {
 707         unsigned long blocksize = inode->i_sb->s_blocksize;
 708         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 709
 710         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 711             (laarr[*c].extLength >> 30) ==
 712                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 713                 int curr = *c;
 714                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 715                             blocksize - 1) >> blocksize_bits;
 716                 int8_t etype = (laarr[curr].extLength >> 30);
 717
 718                 if (blen == 1)
 719                         ;
 720                 else if (!offset || blen == offset + 1) {
 721                         laarr[curr + 2] = laarr[curr + 1];
 722                         laarr[curr + 1] = laarr[curr];
 723                 } else {
 724                         laarr[curr + 3] = laarr[curr + 1];
 725                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 726                 }
 727
 728                 if (offset) {
 729                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 730                                 udf_free_blocks(inode->i_sb, inode,
 731                                                 &laarr[curr].extLocation,
 732                                                 0, offset);
 733                                 laarr[curr].extLength =
 734                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 735                                         (offset << blocksize_bits);
 736                                 laarr[curr].extLocation.logicalBlockNum = 0;
 737                                 laarr[curr].extLocation.
 738                                                 partitionReferenceNum = 0;
 739                         } else
 740                                 laarr[curr].extLength = (etype << 30) |
 741                                         (offset << blocksize_bits);
 742                         curr++;
 743                         (*c)++;
 744                         (*endnum)++;
 745                 }
 746
 747                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 748                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 749                         laarr[curr].extLocation.partitionReferenceNum =
 750                                 UDF_I(inode)->i_location.partitionReferenceNum;
 751                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 752                         blocksize;
 753                 curr++;
 754
 755                 if (blen != offset + 1) {
 756                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 757                                 laarr[curr].extLocation.logicalBlockNum +=
 758                                                                 offset + 1;
 759                         laarr[curr].extLength = (etype << 30) |
 760                                 ((blen - (offset + 1)) << blocksize_bits);
 761                         curr++;
 762                         (*endnum)++;
 763                 }
 764         }
 765 }
 766
 767 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 768                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 769                                  int *endnum)
 770 {
 771         int start, length = 0, currlength = 0, i;
 772
 773         if (*endnum >= (c + 1)) {
 774                 if (!lastblock)
 775                         return;
 776                 else
 777                         start = c;
 778         } else {
 779                 if ((laarr[c + 1].extLength >> 30) ==
 780                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 781                         start = c + 1;
 782                         length = currlength =
 783                                 (((laarr[c + 1].extLength &
 784                                         UDF_EXTENT_LENGTH_MASK) +
 785                                 inode->i_sb->s_blocksize - 1) >>
 786                                 inode->i_sb->s_blocksize_bits);
 787                 } else
 788                         start = c;
 789         }
 790
 791         for (i = start + 1; i <= *endnum; i++) {
 792                 if (i == *endnum) {
 793                         if (lastblock)
 794                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 795                 } else if ((laarr[i].extLength >> 30) ==
 796                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 797                         length += (((laarr[i].extLength &
 798                                                 UDF_EXTENT_LENGTH_MASK) +
 799                                     inode->i_sb->s_blocksize - 1) >>
 800                                     inode->i_sb->s_blocksize_bits);
 801                 } else
 802                         break;
 803         }
 804
 805         if (length) {
 806                 int next = laarr[start].extLocation.logicalBlockNum +
 807                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 808                           inode->i_sb->s_blocksize - 1) >>
 809                           inode->i_sb->s_blocksize_bits);
 810                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 811                                 laarr[start].extLocation.partitionReferenceNum,
 812                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 813                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 814                                 currlength);
 815                 if (numalloc)   {
 816                         if (start == (c + 1))
 817                                 laarr[start].extLength +=
 818                                         (numalloc <<
 819                                          inode->i_sb->s_blocksize_bits);
 820                         else {
 821                                 memmove(&laarr[c + 2], &laarr[c + 1],
 822                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 823                                 (*endnum)++;
 824                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 825                                 laarr[c + 1].extLocation.partitionReferenceNum =
 826                                         laarr[c].extLocation.
 827                                                         partitionReferenceNum;
 828                                 laarr[c + 1].extLength =
 829                                         EXT_NOT_RECORDED_ALLOCATED |
 830                                         (numalloc <<
 831                                          inode->i_sb->s_blocksize_bits);
 832                                 start = c + 1;
 833                         }
 834
 835                         for (i = start + 1; numalloc && i < *endnum; i++) {
 836                                 int elen = ((laarr[i].extLength &
 837                                                 UDF_EXTENT_LENGTH_MASK) +
 838                                             inode->i_sb->s_blocksize - 1) >>
 839                                             inode->i_sb->s_blocksize_bits;
 840
 841                                 if (elen > numalloc) {
 842                                         laarr[i].extLength -=
 843                                                 (numalloc <<
 844                                                  inode->i_sb->s_blocksize_bits);
 845                                         numalloc = 0;
 846                                 } else {
 847                                         numalloc -= elen;
 848                                         if (*endnum > (i + 1))
 849                                                 memmove(&laarr[i],
 850                                                         &laarr[i + 1],
 851                                                         sizeof(struct long_ad) *
 852                                                         (*endnum - (i + 1)));
 853                                         i--;
 854                                         (*endnum)--;
 855                                 }
 856                         }
 857                         UDF_I(inode)->i_lenExtents +=
 858                                 numalloc << inode->i_sb->s_blocksize_bits;
 859                 }
 860         }
 861 }
 862
 863 static void udf_merge_extents(struct inode *inode,
 864                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 865                               int *endnum)
 866 {
 867         int i;
 868         unsigned long blocksize = inode->i_sb->s_blocksize;
 869         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 870
 871         for (i = 0; i < (*endnum - 1); i++) {
 872                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 873                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 874
 875                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 876                         (((li->extLength >> 30) ==
 877                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 878                         ((lip1->extLocation.logicalBlockNum -
 879                           li->extLocation.logicalBlockNum) ==
 880                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 881                         blocksize - 1) >> blocksize_bits)))) {
 882
 883                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 884                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 885                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 886                                 lip1->extLength = (lip1->extLength -
 887                                                   (li->extLength &
 888                                                    UDF_EXTENT_LENGTH_MASK) +
 889                                                    UDF_EXTENT_LENGTH_MASK) &
 890                                                         ~(blocksize - 1);
 891                                 li->extLength = (li->extLength &
 892                                                  UDF_EXTENT_FLAG_MASK) +
 893                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 894                                                 blocksize;
 895                                 lip1->extLocation.logicalBlockNum =
 896                                         li->extLocation.logicalBlockNum +
 897                                         ((li->extLength &
 898                                                 UDF_EXTENT_LENGTH_MASK) >>
 899                                                 blocksize_bits);
 900                         } else {
 901                                 li->extLength = lip1->extLength +
 902                                         (((li->extLength &
 903                                                 UDF_EXTENT_LENGTH_MASK) +
 904                                          blocksize - 1) & ~(blocksize - 1));
 905                                 if (*endnum > (i + 2))
 906                                         memmove(&laarr[i + 1], &laarr[i + 2],
 907                                                 sizeof(struct long_ad) *
 908                                                 (*endnum - (i + 2)));
 909                                 i--;
 910                                 (*endnum)--;
 911                         }
 912                 } else if (((li->extLength >> 30) ==
 913                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 914                            ((lip1->extLength >> 30) ==
 915                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 916                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
 917                                         ((li->extLength &
 918                                           UDF_EXTENT_LENGTH_MASK) +
 919                                          blocksize - 1) >> blocksize_bits);
 920                         li->extLocation.logicalBlockNum = 0;
 921                         li->extLocation.partitionReferenceNum = 0;
 922
 923                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 924                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 925                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 926                                 lip1->extLength = (lip1->extLength -
 927                                                    (li->extLength &
 928                                                    UDF_EXTENT_LENGTH_MASK) +
 929                                                    UDF_EXTENT_LENGTH_MASK) &
 930                                                    ~(blocksize - 1);
 931                                 li->extLength = (li->extLength &
 932                                                  UDF_EXTENT_FLAG_MASK) +
 933                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 934                                                 blocksize;
 935                         } else {
 936                                 li->extLength = lip1->extLength +
 937                                         (((li->extLength &
 938                                                 UDF_EXTENT_LENGTH_MASK) +
 939                                           blocksize - 1) & ~(blocksize - 1));
 940                                 if (*endnum > (i + 2))
 941                                         memmove(&laarr[i + 1], &laarr[i + 2],
 942                                                 sizeof(struct long_ad) *
 943                                                 (*endnum - (i + 2)));
 944                                 i--;
 945                                 (*endnum)--;
 946                         }
 947                 } else if ((li->extLength >> 30) ==
 948                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 949                         udf_free_blocks(inode->i_sb, inode,
 950                                         &li->extLocation, 0,
 951                                         ((li->extLength &
 952                                                 UDF_EXTENT_LENGTH_MASK) +
 953                                          blocksize - 1) >> blocksize_bits);
 954                         li->extLocation.logicalBlockNum = 0;
 955                         li->extLocation.partitionReferenceNum = 0;
 956                         li->extLength = (li->extLength &
 957                                                 UDF_EXTENT_LENGTH_MASK) |
 958                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 959                 }
 960         }
 961 }
 962
 963 static void udf_update_extents(struct inode *inode,
 964                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 965                                int startnum, int endnum,
 966                                struct extent_position *epos)
 967 {
 968         int start = 0, i;
 969         struct kernel_lb_addr tmploc;
 970         uint32_t tmplen;
 971
 972         if (startnum > endnum) {
 973                 for (i = 0; i < (startnum - endnum); i++)
 974                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 975                                         laarr[i].extLength);
 976         } else if (startnum < endnum) {
 977                 for (i = 0; i < (endnum - startnum); i++) {
 978                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 979                                         laarr[i].extLength);
 980                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 981                                       &laarr[i].extLength, 1);
 982                         start++;
 983                 }
 984         }
 985
 986         for (i = start; i < endnum; i++) {
 987                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 988                 udf_write_aext(inode, epos, &laarr[i].extLocation,
 989                                laarr[i].extLength, 1);
 990         }
 991 }
 992
 993 struct buffer_head *udf_bread(struct inode *inode, int block,
 994                               int create, int *err)
 995 {
 996         struct buffer_head *bh = NULL;
 997
 998         bh = udf_getblk(inode, block, create, err);
 999         if (!bh)
1000                 return NULL;
1001
1002         if (buffer_uptodate(bh))
1003                 return bh;
1004
1005         ll_rw_block(READ, 1, &bh);
1006
1007         wait_on_buffer(bh);
1008         if (buffer_uptodate(bh))
1009                 return bh;
1010
1011         brelse(bh);
1012         *err = -EIO;
1013         return NULL;
1014 }
1015
1016 void udf_truncate(struct inode *inode)
1017 {
1018         int offset;
1019         int err;
1020         struct udf_inode_info *iinfo;
1021
1022         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1023               S_ISLNK(inode->i_mode)))
1024                 return;
1025         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1026                 return;
1027
1028         lock_kernel();
1029         iinfo = UDF_I(inode);
1030         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1031                 if (inode->i_sb->s_blocksize <
1032                                 (udf_file_entry_alloc_offset(inode) +
1033                                  inode->i_size)) {
1034                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1035                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1036                                 inode->i_size = iinfo->i_lenAlloc;
1037                                 unlock_kernel();
1038                                 return;
1039                         } else
1040                                 udf_truncate_extents(inode);
1041                 } else {
1042                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1043                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1044                                 0x00, inode->i_sb->s_blocksize -
1045                                 offset - udf_file_entry_alloc_offset(inode));
1046                         iinfo->i_lenAlloc = inode->i_size;
1047                 }
1048         } else {
1049                 block_truncate_page(inode->i_mapping, inode->i_size,
1050                                     udf_get_block);
1051                 udf_truncate_extents(inode);
1052         }
1053
1054         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1055         if (IS_SYNC(inode))
1056                 udf_sync_inode(inode);
1057         else
1058                 mark_inode_dirty(inode);
1059         unlock_kernel();
1060 }
1061
1062 static void __udf_read_inode(struct inode *inode)
1063 {
1064         struct buffer_head *bh = NULL;
1065         struct fileEntry *fe;
1066         uint16_t ident;
1067         struct udf_inode_info *iinfo = UDF_I(inode);
1068
1069         /*
1070          * Set defaults, but the inode is still incomplete!
1071          * Note: get_new_inode() sets the following on a new inode:
1072          *      i_sb = sb
1073          *      i_no = ino
1074          *      i_flags = sb->s_flags
1075          *      i_state = 0
1076          * clean_inode(): zero fills and sets
1077          *      i_count = 1
1078          *      i_nlink = 1
1079          *      i_op = NULL;
1080          */
1081         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1082         if (!bh) {
1083                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1084                        inode->i_ino);
1085                 make_bad_inode(inode);
1086                 return;
1087         }
1088
1089         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1090             ident != TAG_IDENT_USE) {
1091                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1092                                 "failed ident=%d\n", inode->i_ino, ident);
1093                 brelse(bh);
1094                 make_bad_inode(inode);
1095                 return;
1096         }
1097
1098         fe = (struct fileEntry *)bh->b_data;
1099
1100         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1101                 struct buffer_head *ibh;
1102
1103                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1104                                         &ident);
1105                 if (ident == TAG_IDENT_IE && ibh) {
1106                         struct buffer_head *nbh = NULL;
1107                         struct kernel_lb_addr loc;
1108                         struct indirectEntry *ie;
1109
1110                         ie = (struct indirectEntry *)ibh->b_data;
1111                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1112
1113                         if (ie->indirectICB.extLength &&
1114                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1115                                                         &ident))) {
1116                                 if (ident == TAG_IDENT_FE ||
1117                                         ident == TAG_IDENT_EFE) {
1118                                         memcpy(&iinfo->i_location,
1119                                                 &loc,
1120                                                 sizeof(struct kernel_lb_addr));
1121                                         brelse(bh);
1122                                         brelse(ibh);
1123                                         brelse(nbh);
1124                                         __udf_read_inode(inode);
1125                                         return;
1126                                 }
1127                                 brelse(nbh);
1128                         }
1129                 }
1130                 brelse(ibh);
1131         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1132                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1133                        le16_to_cpu(fe->icbTag.strategyType));
1134                 brelse(bh);
1135                 make_bad_inode(inode);
1136                 return;
1137         }
1138         udf_fill_inode(inode, bh);
1139
1140         brelse(bh);
1141 }
1142
1143 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1144 {
1145         struct fileEntry *fe;
1146         struct extendedFileEntry *efe;
1147         int offset;
1148         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1149         struct udf_inode_info *iinfo = UDF_I(inode);
1150
1151         fe = (struct fileEntry *)bh->b_data;
1152         efe = (struct extendedFileEntry *)bh->b_data;
1153
1154         if (fe->icbTag.strategyType == cpu_to_le16(4))
1155                 iinfo->i_strat4096 = 0;
1156         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1157                 iinfo->i_strat4096 = 1;
1158
1159         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1160                                                         ICBTAG_FLAG_AD_MASK;
1161         iinfo->i_unique = 0;
1162         iinfo->i_lenEAttr = 0;
1163         iinfo->i_lenExtents = 0;
1164         iinfo->i_lenAlloc = 0;
1165         iinfo->i_next_alloc_block = 0;
1166         iinfo->i_next_alloc_goal = 0;
1167         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1168                 iinfo->i_efe = 1;
1169                 iinfo->i_use = 0;
1170                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1171                                         sizeof(struct extendedFileEntry))) {
1172                         make_bad_inode(inode);
1173                         return;
1174                 }
1175                 memcpy(iinfo->i_ext.i_data,
1176                        bh->b_data + sizeof(struct extendedFileEntry),
1177                        inode->i_sb->s_blocksize -
1178                                         sizeof(struct extendedFileEntry));
1179         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1180                 iinfo->i_efe = 0;
1181                 iinfo->i_use = 0;
1182                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1183                                                 sizeof(struct fileEntry))) {
1184                         make_bad_inode(inode);
1185                         return;
1186                 }
1187                 memcpy(iinfo->i_ext.i_data,
1188                        bh->b_data + sizeof(struct fileEntry),
1189                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1190         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1191                 iinfo->i_efe = 0;
1192                 iinfo->i_use = 1;
1193                 iinfo->i_lenAlloc = le32_to_cpu(
1194                                 ((struct unallocSpaceEntry *)bh->b_data)->
1195                                  lengthAllocDescs);
1196                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1197                                         sizeof(struct unallocSpaceEntry))) {
1198                         make_bad_inode(inode);
1199                         return;
1200                 }
1201                 memcpy(iinfo->i_ext.i_data,
1202                        bh->b_data + sizeof(struct unallocSpaceEntry),
1203                        inode->i_sb->s_blocksize -
1204                                         sizeof(struct unallocSpaceEntry));
1205                 return;
1206         }
1207
1208         inode->i_uid = le32_to_cpu(fe->uid);
1209         if (inode->i_uid == -1 ||
1210             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1211             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1212                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1213
1214         inode->i_gid = le32_to_cpu(fe->gid);
1215         if (inode->i_gid == -1 ||
1216             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1217             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1218                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1219
1220         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1221         if (!inode->i_nlink)
1222                 inode->i_nlink = 1;
1223
1224         inode->i_size = le64_to_cpu(fe->informationLength);
1225         iinfo->i_lenExtents = inode->i_size;
1226
1227         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1228                         sbi->s_fmode != UDF_INVALID_MODE)
1229                 inode->i_mode = sbi->s_fmode;
1230         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1231                         sbi->s_dmode != UDF_INVALID_MODE)
1232                 inode->i_mode = sbi->s_dmode;
1233         else
1234                 inode->i_mode = udf_convert_permissions(fe);
1235         inode->i_mode &= ~sbi->s_umask;
1236
1237         if (iinfo->i_efe == 0) {
1238                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1239                         (inode->i_sb->s_blocksize_bits - 9);
1240
1241                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1242                         inode->i_atime = sbi->s_record_time;
1243
1244                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1245                                             fe->modificationTime))
1246                         inode->i_mtime = sbi->s_record_time;
1247
1248                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1249                         inode->i_ctime = sbi->s_record_time;
1250
1251                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1252                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1253                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1254                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1255         } else {
1256                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1257                     (inode->i_sb->s_blocksize_bits - 9);
1258
1259                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1260                         inode->i_atime = sbi->s_record_time;
1261
1262                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1263                                             efe->modificationTime))
1264                         inode->i_mtime = sbi->s_record_time;
1265
1266                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1267                         iinfo->i_crtime = sbi->s_record_time;
1268
1269                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1270                         inode->i_ctime = sbi->s_record_time;
1271
1272                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1273                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1274                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1275                 offset = sizeof(struct extendedFileEntry) +
1276                                                         iinfo->i_lenEAttr;
1277         }
1278
1279         switch (fe->icbTag.fileType) {
1280         case ICBTAG_FILE_TYPE_DIRECTORY:
1281                 inode->i_op = &udf_dir_inode_operations;
1282                 inode->i_fop = &udf_dir_operations;
1283                 inode->i_mode |= S_IFDIR;
1284                 inc_nlink(inode);
1285                 break;
1286         case ICBTAG_FILE_TYPE_REALTIME:
1287         case ICBTAG_FILE_TYPE_REGULAR:
1288         case ICBTAG_FILE_TYPE_UNDEF:
1289         case ICBTAG_FILE_TYPE_VAT20:
1290                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1291                         inode->i_data.a_ops = &udf_adinicb_aops;
1292                 else
1293                         inode->i_data.a_ops = &udf_aops;
1294                 inode->i_op = &udf_file_inode_operations;
1295                 inode->i_fop = &udf_file_operations;
1296                 inode->i_mode |= S_IFREG;
1297                 break;
1298         case ICBTAG_FILE_TYPE_BLOCK:
1299                 inode->i_mode |= S_IFBLK;
1300                 break;
1301         case ICBTAG_FILE_TYPE_CHAR:
1302                 inode->i_mode |= S_IFCHR;
1303                 break;
1304         case ICBTAG_FILE_TYPE_FIFO:
1305                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1306                 break;
1307         case ICBTAG_FILE_TYPE_SOCKET:
1308                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1309                 break;
1310         case ICBTAG_FILE_TYPE_SYMLINK:
1311                 inode->i_data.a_ops = &udf_symlink_aops;
1312                 inode->i_op = &udf_symlink_inode_operations;
1313                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1314                 break;
1315         case ICBTAG_FILE_TYPE_MAIN:
1316                 udf_debug("METADATA FILE-----\n");
1317                 break;
1318         case ICBTAG_FILE_TYPE_MIRROR:
1319                 udf_debug("METADATA MIRROR FILE-----\n");
1320                 break;
1321         case ICBTAG_FILE_TYPE_BITMAP:
1322                 udf_debug("METADATA BITMAP FILE-----\n");
1323                 break;
1324         default:
1325                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1326                                 "file type=%d\n", inode->i_ino,
1327                                 fe->icbTag.fileType);
1328                 make_bad_inode(inode);
1329                 return;
1330         }
1331         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1332                 struct deviceSpec *dsea =
1333                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1334                 if (dsea) {
1335                         init_special_inode(inode, inode->i_mode,
1336                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1337                                       le32_to_cpu(dsea->minorDeviceIdent)));
1338                         /* Developer ID ??? */
1339                 } else
1340                         make_bad_inode(inode);
1341         }
1342 }
1343
1344 static int udf_alloc_i_data(struct inode *inode, size_t size)
1345 {
1346         struct udf_inode_info *iinfo = UDF_I(inode);
1347         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1348
1349         if (!iinfo->i_ext.i_data) {
1350                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1351                                 "no free memory\n", inode->i_ino);
1352                 return -ENOMEM;
1353         }
1354
1355         return 0;
1356 }
1357
1358 static mode_t udf_convert_permissions(struct fileEntry *fe)
1359 {
1360         mode_t mode;
1361         uint32_t permissions;
1362         uint32_t flags;
1363
1364         permissions = le32_to_cpu(fe->permissions);
1365         flags = le16_to_cpu(fe->icbTag.flags);
1366
1367         mode =  ((permissions) & S_IRWXO) |
1368                 ((permissions >> 2) & S_IRWXG) |
1369                 ((permissions >> 4) & S_IRWXU) |
1370                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1371                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1372                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1373
1374         return mode;
1375 }
1376
1377 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1378 {
1379         int ret;
1380
1381         lock_kernel();
1382         ret = udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1383         unlock_kernel();
1384
1385         return ret;
1386 }
1387
1388 int udf_sync_inode(struct inode *inode)
1389 {
1390         return udf_update_inode(inode, 1);
1391 }
1392
1393 static int udf_update_inode(struct inode *inode, int do_sync)
1394 {
1395         struct buffer_head *bh = NULL;
1396         struct fileEntry *fe;
1397         struct extendedFileEntry *efe;
1398         uint32_t udfperms;
1399         uint16_t icbflags;
1400         uint16_t crclen;
1401         int err = 0;
1402         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1403         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1404         struct udf_inode_info *iinfo = UDF_I(inode);
1405
1406         bh = udf_tgetblk(inode->i_sb,
1407                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1408         if (!bh) {
1409                 udf_debug("getblk failure\n");
1410                 return -ENOMEM;
1411         }
1412
1413         lock_buffer(bh);
1414         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1415         fe = (struct fileEntry *)bh->b_data;
1416         efe = (struct extendedFileEntry *)bh->b_data;
1417
1418         if (iinfo->i_use) {
1419                 struct unallocSpaceEntry *use =
1420                         (struct unallocSpaceEntry *)bh->b_data;
1421
1422                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1423                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1424                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1425                                         sizeof(struct unallocSpaceEntry));
1426                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1427                 use->descTag.tagLocation =
1428                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1429                 crclen = sizeof(struct unallocSpaceEntry) +
1430                                 iinfo->i_lenAlloc - sizeof(struct tag);
1431                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1432                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1433                                                            sizeof(struct tag),
1434                                                            crclen));
1435                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1436
1437                 goto out;
1438         }
1439
1440         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1441                 fe->uid = cpu_to_le32(-1);
1442         else
1443                 fe->uid = cpu_to_le32(inode->i_uid);
1444
1445         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1446                 fe->gid = cpu_to_le32(-1);
1447         else
1448                 fe->gid = cpu_to_le32(inode->i_gid);
1449
1450         udfperms = ((inode->i_mode & S_IRWXO)) |
1451                    ((inode->i_mode & S_IRWXG) << 2) |
1452                    ((inode->i_mode & S_IRWXU) << 4);
1453
1454         udfperms |= (le32_to_cpu(fe->permissions) &
1455                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1456                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1457                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1458         fe->permissions = cpu_to_le32(udfperms);
1459
1460         if (S_ISDIR(inode->i_mode))
1461                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1462         else
1463                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1464
1465         fe->informationLength = cpu_to_le64(inode->i_size);
1466
1467         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1468                 struct regid *eid;
1469                 struct deviceSpec *dsea =
1470                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1471                 if (!dsea) {
1472                         dsea = (struct deviceSpec *)
1473                                 udf_add_extendedattr(inode,
1474                                                      sizeof(struct deviceSpec) +
1475                                                      sizeof(struct regid), 12, 0x3);
1476                         dsea->attrType = cpu_to_le32(12);
1477                         dsea->attrSubtype = 1;
1478                         dsea->attrLength = cpu_to_le32(
1479                                                 sizeof(struct deviceSpec) +
1480                                                 sizeof(struct regid));
1481                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1482                 }
1483                 eid = (struct regid *)dsea->impUse;
1484                 memset(eid, 0, sizeof(struct regid));
1485                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1486                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1487                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1488                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1489                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1490         }
1491
1492         if (iinfo->i_efe == 0) {
1493                 memcpy(bh->b_data + sizeof(struct fileEntry),
1494                        iinfo->i_ext.i_data,
1495                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1496                 fe->logicalBlocksRecorded = cpu_to_le64(
1497                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1498                         (blocksize_bits - 9));
1499
1500                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1501                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1502                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1503                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1504                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1505                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1506                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1507                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1508                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1509                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1510                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1511                 crclen = sizeof(struct fileEntry);
1512         } else {
1513                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1514                        iinfo->i_ext.i_data,
1515                        inode->i_sb->s_blocksize -
1516                                         sizeof(struct extendedFileEntry));
1517                 efe->objectSize = cpu_to_le64(inode->i_size);
1518                 efe->logicalBlocksRecorded = cpu_to_le64(
1519                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1520                         (blocksize_bits - 9));
1521
1522                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1523                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1524                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1525                         iinfo->i_crtime = inode->i_atime;
1526
1527                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1528                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1529                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1530                         iinfo->i_crtime = inode->i_mtime;
1531
1532                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1533                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1534                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1535                         iinfo->i_crtime = inode->i_ctime;
1536
1537                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1538                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1539                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1540                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1541
1542                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1543                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1544                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1545                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1546                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1547                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1548                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1549                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1550                 crclen = sizeof(struct extendedFileEntry);
1551         }
1552         if (iinfo->i_strat4096) {
1553                 fe->icbTag.strategyType = cpu_to_le16(4096);
1554                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1555                 fe->icbTag.numEntries = cpu_to_le16(2);
1556         } else {
1557                 fe->icbTag.strategyType = cpu_to_le16(4);
1558                 fe->icbTag.numEntries = cpu_to_le16(1);
1559         }
1560
1561         if (S_ISDIR(inode->i_mode))
1562                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1563         else if (S_ISREG(inode->i_mode))
1564                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1565         else if (S_ISLNK(inode->i_mode))
1566                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1567         else if (S_ISBLK(inode->i_mode))
1568                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1569         else if (S_ISCHR(inode->i_mode))
1570                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1571         else if (S_ISFIFO(inode->i_mode))
1572                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1573         else if (S_ISSOCK(inode->i_mode))
1574                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1575
1576         icbflags =      iinfo->i_alloc_type |
1577                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1578                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1579                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1580                         (le16_to_cpu(fe->icbTag.flags) &
1581                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1582                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1583
1584         fe->icbTag.flags = cpu_to_le16(icbflags);
1585         if (sbi->s_udfrev >= 0x0200)
1586                 fe->descTag.descVersion = cpu_to_le16(3);
1587         else
1588                 fe->descTag.descVersion = cpu_to_le16(2);
1589         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1590         fe->descTag.tagLocation = cpu_to_le32(
1591                                         iinfo->i_location.logicalBlockNum);
1592         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1593         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1594         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1595                                                   crclen));
1596         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1597
1598 out:
1599         set_buffer_uptodate(bh);
1600         unlock_buffer(bh);
1601
1602         /* write the data blocks */
1603         mark_buffer_dirty(bh);
1604         if (do_sync) {
1605                 sync_dirty_buffer(bh);
1606                 if (buffer_write_io_error(bh)) {
1607                         printk(KERN_WARNING "IO error syncing udf inode "
1608                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1609                                 inode->i_ino);
1610                         err = -EIO;
1611                 }
1612         }
1613         brelse(bh);
1614
1615         return err;
1616 }
1617
1618 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1619 {
1620         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1621         struct inode *inode = iget_locked(sb, block);
1622
1623         if (!inode)
1624                 return NULL;
1625
1626         if (inode->i_state & I_NEW) {
1627                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1628                 __udf_read_inode(inode);
1629                 unlock_new_inode(inode);
1630         }
1631
1632         if (is_bad_inode(inode))
1633                 goto out_iput;
1634
1635         if (ino->logicalBlockNum >= UDF_SB(sb)->
1636                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1637                 udf_debug("block=%d, partition=%d out of range\n",
1638                           ino->logicalBlockNum, ino->partitionReferenceNum);
1639                 make_bad_inode(inode);
1640                 goto out_iput;
1641         }
1642
1643         return inode;
1644
1645  out_iput:
1646         iput(inode);
1647         return NULL;
1648 }
1649
1650 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1651                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1652 {
1653         int adsize;
1654         struct short_ad *sad = NULL;
1655         struct long_ad *lad = NULL;
1656         struct allocExtDesc *aed;
1657         int8_t etype;
1658         uint8_t *ptr;
1659         struct udf_inode_info *iinfo = UDF_I(inode);
1660
1661         if (!epos->bh)
1662                 ptr = iinfo->i_ext.i_data + epos->offset -
1663                         udf_file_entry_alloc_offset(inode) +
1664                         iinfo->i_lenEAttr;
1665         else
1666                 ptr = epos->bh->b_data + epos->offset;
1667
1668         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1669                 adsize = sizeof(struct short_ad);
1670         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1671                 adsize = sizeof(struct long_ad);
1672         else
1673                 return -1;
1674
1675         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1676                 unsigned char *sptr, *dptr;
1677                 struct buffer_head *nbh;
1678                 int err, loffset;
1679                 struct kernel_lb_addr obloc = epos->block;
1680
1681                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1682                                                 obloc.partitionReferenceNum,
1683                                                 obloc.logicalBlockNum, &err);
1684                 if (!epos->block.logicalBlockNum)
1685                         return -1;
1686                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1687                                                                  &epos->block,
1688                                                                  0));
1689                 if (!nbh)
1690                         return -1;
1691                 lock_buffer(nbh);
1692                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1693                 set_buffer_uptodate(nbh);
1694                 unlock_buffer(nbh);
1695                 mark_buffer_dirty_inode(nbh, inode);
1696
1697                 aed = (struct allocExtDesc *)(nbh->b_data);
1698                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1699                         aed->previousAllocExtLocation =
1700                                         cpu_to_le32(obloc.logicalBlockNum);
1701                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1702                         loffset = epos->offset;
1703                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1704                         sptr = ptr - adsize;
1705                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1706                         memcpy(dptr, sptr, adsize);
1707                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1708                 } else {
1709                         loffset = epos->offset + adsize;
1710                         aed->lengthAllocDescs = cpu_to_le32(0);
1711                         sptr = ptr;
1712                         epos->offset = sizeof(struct allocExtDesc);
1713
1714                         if (epos->bh) {
1715                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1716                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1717                         } else {
1718                                 iinfo->i_lenAlloc += adsize;
1719                                 mark_inode_dirty(inode);
1720                         }
1721                 }
1722                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1723                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1724                                     epos->block.logicalBlockNum, sizeof(struct tag));
1725                 else
1726                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1727                                     epos->block.logicalBlockNum, sizeof(struct tag));
1728                 switch (iinfo->i_alloc_type) {
1729                 case ICBTAG_FLAG_AD_SHORT:
1730                         sad = (struct short_ad *)sptr;
1731                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1732                                                      inode->i_sb->s_blocksize);
1733                         sad->extPosition =
1734                                 cpu_to_le32(epos->block.logicalBlockNum);
1735                         break;
1736                 case ICBTAG_FLAG_AD_LONG:
1737                         lad = (struct long_ad *)sptr;
1738                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1739                                                      inode->i_sb->s_blocksize);
1740                         lad->extLocation = cpu_to_lelb(epos->block);
1741                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1742                         break;
1743                 }
1744                 if (epos->bh) {
1745                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1746                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1747                                 udf_update_tag(epos->bh->b_data, loffset);
1748                         else
1749                                 udf_update_tag(epos->bh->b_data,
1750                                                 sizeof(struct allocExtDesc));
1751                         mark_buffer_dirty_inode(epos->bh, inode);
1752                         brelse(epos->bh);
1753                 } else {
1754                         mark_inode_dirty(inode);
1755                 }
1756                 epos->bh = nbh;
1757         }
1758
1759         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1760
1761         if (!epos->bh) {
1762                 iinfo->i_lenAlloc += adsize;
1763                 mark_inode_dirty(inode);
1764         } else {
1765                 aed = (struct allocExtDesc *)epos->bh->b_data;
1766                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1767                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1768                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1769                         udf_update_tag(epos->bh->b_data,
1770                                         epos->offset + (inc ? 0 : adsize));
1771                 else
1772                         udf_update_tag(epos->bh->b_data,
1773                                         sizeof(struct allocExtDesc));
1774                 mark_buffer_dirty_inode(epos->bh, inode);
1775         }
1776
1777         return etype;
1778 }
1779
1780 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1781                       struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1782 {
1783         int adsize;
1784         uint8_t *ptr;
1785         struct short_ad *sad;
1786         struct long_ad *lad;
1787         struct udf_inode_info *iinfo = UDF_I(inode);
1788
1789         if (!epos->bh)
1790                 ptr = iinfo->i_ext.i_data + epos->offset -
1791                         udf_file_entry_alloc_offset(inode) +
1792                         iinfo->i_lenEAttr;
1793         else
1794                 ptr = epos->bh->b_data + epos->offset;
1795
1796         switch (iinfo->i_alloc_type) {
1797         case ICBTAG_FLAG_AD_SHORT:
1798                 sad = (struct short_ad *)ptr;
1799                 sad->extLength = cpu_to_le32(elen);
1800                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1801                 adsize = sizeof(struct short_ad);
1802                 break;
1803         case ICBTAG_FLAG_AD_LONG:
1804                 lad = (struct long_ad *)ptr;
1805                 lad->extLength = cpu_to_le32(elen);
1806                 lad->extLocation = cpu_to_lelb(*eloc);
1807                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1808                 adsize = sizeof(struct long_ad);
1809                 break;
1810         default:
1811                 return -1;
1812         }
1813
1814         if (epos->bh) {
1815                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1816                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1817                         struct allocExtDesc *aed =
1818                                 (struct allocExtDesc *)epos->bh->b_data;
1819                         udf_update_tag(epos->bh->b_data,
1820                                        le32_to_cpu(aed->lengthAllocDescs) +
1821                                        sizeof(struct allocExtDesc));
1822                 }
1823                 mark_buffer_dirty_inode(epos->bh, inode);
1824         } else {
1825                 mark_inode_dirty(inode);
1826         }
1827
1828         if (inc)
1829                 epos->offset += adsize;
1830
1831         return (elen >> 30);
1832 }
1833
1834 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1835                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1836 {
1837         int8_t etype;
1838
1839         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1840                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1841                 int block;
1842                 epos->block = *eloc;
1843                 epos->offset = sizeof(struct allocExtDesc);
1844                 brelse(epos->bh);
1845                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1846                 epos->bh = udf_tread(inode->i_sb, block);
1847                 if (!epos->bh) {
1848                         udf_debug("reading block %d failed!\n", block);
1849                         return -1;
1850                 }
1851         }
1852
1853         return etype;
1854 }
1855
1856 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1857                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1858 {
1859         int alen;
1860         int8_t etype;
1861         uint8_t *ptr;
1862         struct short_ad *sad;
1863         struct long_ad *lad;
1864         struct udf_inode_info *iinfo = UDF_I(inode);
1865
1866         if (!epos->bh) {
1867                 if (!epos->offset)
1868                         epos->offset = udf_file_entry_alloc_offset(inode);
1869                 ptr = iinfo->i_ext.i_data + epos->offset -
1870                         udf_file_entry_alloc_offset(inode) +
1871                         iinfo->i_lenEAttr;
1872                 alen = udf_file_entry_alloc_offset(inode) +
1873                                                         iinfo->i_lenAlloc;
1874         } else {
1875                 if (!epos->offset)
1876                         epos->offset = sizeof(struct allocExtDesc);
1877                 ptr = epos->bh->b_data + epos->offset;
1878                 alen = sizeof(struct allocExtDesc) +
1879                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1880                                                         lengthAllocDescs);
1881         }
1882
1883         switch (iinfo->i_alloc_type) {
1884         case ICBTAG_FLAG_AD_SHORT:
1885                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1886                 if (!sad)
1887                         return -1;
1888                 etype = le32_to_cpu(sad->extLength) >> 30;
1889                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1890                 eloc->partitionReferenceNum =
1891                                 iinfo->i_location.partitionReferenceNum;
1892                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1893                 break;
1894         case ICBTAG_FLAG_AD_LONG:
1895                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1896                 if (!lad)
1897                         return -1;
1898                 etype = le32_to_cpu(lad->extLength) >> 30;
1899                 *eloc = lelb_to_cpu(lad->extLocation);
1900                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1901                 break;
1902         default:
1903                 udf_debug("alloc_type = %d unsupported\n",
1904                                 iinfo->i_alloc_type);
1905                 return -1;
1906         }
1907
1908         return etype;
1909 }
1910
1911 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1912                               struct kernel_lb_addr neloc, uint32_t nelen)
1913 {
1914         struct kernel_lb_addr oeloc;
1915         uint32_t oelen;
1916         int8_t etype;
1917
1918         if (epos.bh)
1919                 get_bh(epos.bh);
1920
1921         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1922                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1923                 neloc = oeloc;
1924                 nelen = (etype << 30) | oelen;
1925         }
1926         udf_add_aext(inode, &epos, &neloc, nelen, 1);
1927         brelse(epos.bh);
1928
1929         return (nelen >> 30);
1930 }
1931
1932 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1933                        struct kernel_lb_addr eloc, uint32_t elen)
1934 {
1935         struct extent_position oepos;
1936         int adsize;
1937         int8_t etype;
1938         struct allocExtDesc *aed;
1939         struct udf_inode_info *iinfo;
1940
1941         if (epos.bh) {
1942                 get_bh(epos.bh);
1943                 get_bh(epos.bh);
1944         }
1945
1946         iinfo = UDF_I(inode);
1947         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1948                 adsize = sizeof(struct short_ad);
1949         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1950                 adsize = sizeof(struct long_ad);
1951         else
1952                 adsize = 0;
1953
1954         oepos = epos;
1955         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1956                 return -1;
1957
1958         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1959                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
1960                 if (oepos.bh != epos.bh) {
1961                         oepos.block = epos.block;
1962                         brelse(oepos.bh);
1963                         get_bh(epos.bh);
1964                         oepos.bh = epos.bh;
1965                         oepos.offset = epos.offset - adsize;
1966                 }
1967         }
1968         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1969         elen = 0;
1970
1971         if (epos.bh != oepos.bh) {
1972                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
1973                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1974                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1975                 if (!oepos.bh) {
1976                         iinfo->i_lenAlloc -= (adsize * 2);
1977                         mark_inode_dirty(inode);
1978                 } else {
1979                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1980                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1981                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1982                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1983                                 udf_update_tag(oepos.bh->b_data,
1984                                                 oepos.offset - (2 * adsize));
1985                         else
1986                                 udf_update_tag(oepos.bh->b_data,
1987                                                 sizeof(struct allocExtDesc));
1988                         mark_buffer_dirty_inode(oepos.bh, inode);
1989                 }
1990         } else {
1991                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1992                 if (!oepos.bh) {
1993                         iinfo->i_lenAlloc -= adsize;
1994                         mark_inode_dirty(inode);
1995                 } else {
1996                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1997                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1998                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1999                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2000                                 udf_update_tag(oepos.bh->b_data,
2001                                                 epos.offset - adsize);
2002                         else
2003                                 udf_update_tag(oepos.bh->b_data,
2004                                                 sizeof(struct allocExtDesc));
2005                         mark_buffer_dirty_inode(oepos.bh, inode);
2006                 }
2007         }
2008
2009         brelse(epos.bh);
2010         brelse(oepos.bh);
2011
2012         return (elen >> 30);
2013 }
2014
2015 int8_t inode_bmap(struct inode *inode, sector_t block,
2016                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2017                   uint32_t *elen, sector_t *offset)
2018 {
2019         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2020         loff_t lbcount = 0, bcount =
2021             (loff_t) block << blocksize_bits;
2022         int8_t etype;
2023         struct udf_inode_info *iinfo;
2024
2025         iinfo = UDF_I(inode);
2026         pos->offset = 0;
2027         pos->block = iinfo->i_location;
2028         pos->bh = NULL;
2029         *elen = 0;
2030
2031         do {
2032                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2033                 if (etype == -1) {
2034                         *offset = (bcount - lbcount) >> blocksize_bits;
2035                         iinfo->i_lenExtents = lbcount;
2036                         return -1;
2037                 }
2038                 lbcount += *elen;
2039         } while (lbcount <= bcount);
2040
2041         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2042
2043         return etype;
2044 }
2045
2046 long udf_block_map(struct inode *inode, sector_t block)
2047 {
2048         struct kernel_lb_addr eloc;
2049         uint32_t elen;
2050         sector_t offset;
2051         struct extent_position epos = {};
2052         int ret;
2053
2054         lock_kernel();
2055
2056         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2057                                                 (EXT_RECORDED_ALLOCATED >> 30))
2058                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2059         else
2060                 ret = 0;
2061
2062         unlock_kernel();
2063         brelse(epos.bh);
2064
2065         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2066                 return udf_fixed_to_variable(ret);
2067         else
2068                 return ret;
2069 }