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