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