err.no Git - linux-2.6/blob - fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/module.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/buffer_head.h>
  38 #include <linux/writeback.h>
  39 #include <linux/slab.h>
  40
  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_alloc_i_data(struct inode *inode, size_t size);
  54 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  55                                         sector_t *, int *);
  56 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  57                               kernel_lb_addr, uint32_t);
  58 static void udf_split_extents(struct inode *, int *, int, int,
  59                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  60 static void udf_prealloc_extents(struct inode *, int, int,
  61                                  kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  62 static void udf_merge_extents(struct inode *,
  63                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  64 static void udf_update_extents(struct inode *,
  65                                kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  66                                struct extent_position *);
  67 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  68
  69
  70 void udf_delete_inode(struct inode *inode)
  71 {
  72         truncate_inode_pages(&inode->i_data, 0);
  73
  74         if (is_bad_inode(inode))
  75                 goto no_delete;
  76
  77         inode->i_size = 0;
  78         udf_truncate(inode);
  79         lock_kernel();
  80
  81         udf_update_inode(inode, IS_SYNC(inode));
  82         udf_free_inode(inode);
  83
  84         unlock_kernel();
  85         return;
  86
  87 no_delete:
  88         clear_inode(inode);
  89 }
  90
  91 /*
  92  * If we are going to release inode from memory, we discard preallocation and
  93  * truncate last inode extent to proper length. We could use drop_inode() but
  94  * it's called under inode_lock and thus we cannot mark inode dirty there.  We
  95  * use clear_inode() but we have to make sure to write inode as it's not written
  96  * automatically.
  97  */
  98 void udf_clear_inode(struct inode *inode)
  99 {
 100         struct udf_inode_info *iinfo;
 101         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 102                 lock_kernel();
 103                 /* Discard preallocation for directories, symlinks, etc. */
 104                 udf_discard_prealloc(inode);
 105                 udf_truncate_tail_extent(inode);
 106                 unlock_kernel();
 107                 write_inode_now(inode, 0);
 108         }
 109         iinfo = UDF_I(inode);
 110         kfree(iinfo->i_ext.i_data);
 111         iinfo->i_ext.i_data = NULL;
 112 }
 113
 114 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 115 {
 116         return block_write_full_page(page, udf_get_block, wbc);
 117 }
 118
 119 static int udf_readpage(struct file *file, struct page *page)
 120 {
 121         return block_read_full_page(page, udf_get_block);
 122 }
 123
 124 static int udf_write_begin(struct file *file, struct address_space *mapping,
 125                         loff_t pos, unsigned len, unsigned flags,
 126                         struct page **pagep, void **fsdata)
 127 {
 128         *pagep = NULL;
 129         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 130                                 udf_get_block);
 131 }
 132
 133 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 134 {
 135         return generic_block_bmap(mapping, block, udf_get_block);
 136 }
 137
 138 const struct address_space_operations udf_aops = {
 139         .readpage       = udf_readpage,
 140         .writepage      = udf_writepage,
 141         .sync_page      = block_sync_page,
 142         .write_begin            = udf_write_begin,
 143         .write_end              = generic_write_end,
 144         .bmap           = udf_bmap,
 145 };
 146
 147 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 148 {
 149         struct page *page;
 150         char *kaddr;
 151         struct udf_inode_info *iinfo = UDF_I(inode);
 152         struct writeback_control udf_wbc = {
 153                 .sync_mode = WB_SYNC_NONE,
 154                 .nr_to_write = 1,
 155         };
 156
 157         /* from now on we have normal address_space methods */
 158         inode->i_data.a_ops = &udf_aops;
 159
 160         if (!iinfo->i_lenAlloc) {
 161                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 162                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 163                 else
 164                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 165                 mark_inode_dirty(inode);
 166                 return;
 167         }
 168
 169         page = grab_cache_page(inode->i_mapping, 0);
 170         BUG_ON(!PageLocked(page));
 171
 172         if (!PageUptodate(page)) {
 173                 kaddr = kmap(page);
 174                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 175                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 176                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 177                         iinfo->i_lenAlloc);
 178                 flush_dcache_page(page);
 179                 SetPageUptodate(page);
 180                 kunmap(page);
 181         }
 182         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 183                iinfo->i_lenAlloc);
 184         iinfo->i_lenAlloc = 0;
 185         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 186                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 187         else
 188                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 189
 190         inode->i_data.a_ops->writepage(page, &udf_wbc);
 191         page_cache_release(page);
 192
 193         mark_inode_dirty(inode);
 194 }
 195
 196 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 197                                            int *err)
 198 {
 199         int newblock;
 200         struct buffer_head *dbh = NULL;
 201         kernel_lb_addr eloc;
 202         uint32_t elen;
 203         uint8_t alloctype;
 204         struct extent_position epos;
 205
 206         struct udf_fileident_bh sfibh, dfibh;
 207         loff_t f_pos = udf_ext0_offset(inode);
 208         int size = udf_ext0_offset(inode) + inode->i_size;
 209         struct fileIdentDesc cfi, *sfi, *dfi;
 210         struct udf_inode_info *iinfo = UDF_I(inode);
 211
 212         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 213                 alloctype = ICBTAG_FLAG_AD_SHORT;
 214         else
 215                 alloctype = ICBTAG_FLAG_AD_LONG;
 216
 217         if (!inode->i_size) {
 218                 iinfo->i_alloc_type = alloctype;
 219                 mark_inode_dirty(inode);
 220                 return NULL;
 221         }
 222
 223         /* alloc block, and copy data to it */
 224         *block = udf_new_block(inode->i_sb, inode,
 225                                iinfo->i_location.partitionReferenceNum,
 226                                iinfo->i_location.logicalBlockNum, err);
 227         if (!(*block))
 228                 return NULL;
 229         newblock = udf_get_pblock(inode->i_sb, *block,
 230                                   iinfo->i_location.partitionReferenceNum,
 231                                 0);
 232         if (!newblock)
 233                 return NULL;
 234         dbh = udf_tgetblk(inode->i_sb, newblock);
 235         if (!dbh)
 236                 return NULL;
 237         lock_buffer(dbh);
 238         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 239         set_buffer_uptodate(dbh);
 240         unlock_buffer(dbh);
 241         mark_buffer_dirty_inode(dbh, inode);
 242
 243         sfibh.soffset = sfibh.eoffset =
 244                         f_pos & (inode->i_sb->s_blocksize - 1);
 245         sfibh.sbh = sfibh.ebh = NULL;
 246         dfibh.soffset = dfibh.eoffset = 0;
 247         dfibh.sbh = dfibh.ebh = dbh;
 248         while (f_pos < size) {
 249                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 250                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 251                                          NULL, NULL, NULL);
 252                 if (!sfi) {
 253                         brelse(dbh);
 254                         return NULL;
 255                 }
 256                 iinfo->i_alloc_type = alloctype;
 257                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 258                 dfibh.soffset = dfibh.eoffset;
 259                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 260                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 261                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 262                                  sfi->fileIdent +
 263                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 264                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 265                         brelse(dbh);
 266                         return NULL;
 267                 }
 268         }
 269         mark_buffer_dirty_inode(dbh, inode);
 270
 271         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 272                 iinfo->i_lenAlloc);
 273         iinfo->i_lenAlloc = 0;
 274         eloc.logicalBlockNum = *block;
 275         eloc.partitionReferenceNum =
 276                                 iinfo->i_location.partitionReferenceNum;
 277         elen = inode->i_sb->s_blocksize;
 278         iinfo->i_lenExtents = elen;
 279         epos.bh = NULL;
 280         epos.block = iinfo->i_location;
 281         epos.offset = udf_file_entry_alloc_offset(inode);
 282         udf_add_aext(inode, &epos, eloc, elen, 0);
 283         /* UniqueID stuff */
 284
 285         brelse(epos.bh);
 286         mark_inode_dirty(inode);
 287         return dbh;
 288 }
 289
 290 static int udf_get_block(struct inode *inode, sector_t block,
 291                          struct buffer_head *bh_result, int create)
 292 {
 293         int err, new;
 294         struct buffer_head *bh;
 295         sector_t phys = 0;
 296         struct udf_inode_info *iinfo;
 297
 298         if (!create) {
 299                 phys = udf_block_map(inode, block);
 300                 if (phys)
 301                         map_bh(bh_result, inode->i_sb, phys);
 302                 return 0;
 303         }
 304
 305         err = -EIO;
 306         new = 0;
 307         bh = NULL;
 308
 309         lock_kernel();
 310
 311         if (block < 0)
 312                 goto abort_negative;
 313
 314         iinfo = UDF_I(inode);
 315         if (block == iinfo->i_next_alloc_block + 1) {
 316                 iinfo->i_next_alloc_block++;
 317                 iinfo->i_next_alloc_goal++;
 318         }
 319
 320         err = 0;
 321
 322         bh = inode_getblk(inode, block, &err, &phys, &new);
 323         BUG_ON(bh);
 324         if (err)
 325                 goto abort;
 326         BUG_ON(!phys);
 327
 328         if (new)
 329                 set_buffer_new(bh_result);
 330         map_bh(bh_result, inode->i_sb, phys);
 331
 332 abort:
 333         unlock_kernel();
 334         return err;
 335
 336 abort_negative:
 337         udf_warning(inode->i_sb, "udf_get_block", "block < 0");
 338         goto abort;
 339 }
 340
 341 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 342                                       int create, int *err)
 343 {
 344         struct buffer_head *bh;
 345         struct buffer_head dummy;
 346
 347         dummy.b_state = 0;
 348         dummy.b_blocknr = -1000;
 349         *err = udf_get_block(inode, block, &dummy, create);
 350         if (!*err && buffer_mapped(&dummy)) {
 351                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 352                 if (buffer_new(&dummy)) {
 353                         lock_buffer(bh);
 354                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 355                         set_buffer_uptodate(bh);
 356                         unlock_buffer(bh);
 357                         mark_buffer_dirty_inode(bh, inode);
 358                 }
 359                 return bh;
 360         }
 361
 362         return NULL;
 363 }
 364
 365 /* Extend the file by 'blocks' blocks, return the number of extents added */
 366 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 367                     kernel_long_ad *last_ext, sector_t blocks)
 368 {
 369         sector_t add;
 370         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 371         struct super_block *sb = inode->i_sb;
 372         kernel_lb_addr prealloc_loc = {};
 373         int prealloc_len = 0;
 374         struct udf_inode_info *iinfo;
 375
 376         /* The previous extent is fake and we should not extend by anything
 377          * - there's nothing to do... */
 378         if (!blocks && fake)
 379                 return 0;
 380
 381         iinfo = UDF_I(inode);
 382         /* Round the last extent up to a multiple of block size */
 383         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 384                 last_ext->extLength =
 385                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 386                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 387                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 388                 iinfo->i_lenExtents =
 389                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 390                         ~(sb->s_blocksize - 1);
 391         }
 392
 393         /* Last extent are just preallocated blocks? */
 394         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 395                                                 EXT_NOT_RECORDED_ALLOCATED) {
 396                 /* Save the extent so that we can reattach it to the end */
 397                 prealloc_loc = last_ext->extLocation;
 398                 prealloc_len = last_ext->extLength;
 399                 /* Mark the extent as a hole */
 400                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 401                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 402                 last_ext->extLocation.logicalBlockNum = 0;
 403                 last_ext->extLocation.partitionReferenceNum = 0;
 404         }
 405
 406         /* Can we merge with the previous extent? */
 407         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 408                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 409                 add = ((1 << 30) - sb->s_blocksize -
 410                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 411                         sb->s_blocksize_bits;
 412                 if (add > blocks)
 413                         add = blocks;
 414                 blocks -= add;
 415                 last_ext->extLength += add << sb->s_blocksize_bits;
 416         }
 417
 418         if (fake) {
 419                 udf_add_aext(inode, last_pos, last_ext->extLocation,
 420                              last_ext->extLength, 1);
 421                 count++;
 422         } else
 423                 udf_write_aext(inode, last_pos, last_ext->extLocation,
 424                                 last_ext->extLength, 1);
 425
 426         /* Managed to do everything necessary? */
 427         if (!blocks)
 428                 goto out;
 429
 430         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 431         last_ext->extLocation.logicalBlockNum = 0;
 432         last_ext->extLocation.partitionReferenceNum = 0;
 433         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 434         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 435                                 (add << sb->s_blocksize_bits);
 436
 437         /* Create enough extents to cover the whole hole */
 438         while (blocks > add) {
 439                 blocks -= add;
 440                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 441                                  last_ext->extLength, 1) == -1)
 442                         return -1;
 443                 count++;
 444         }
 445         if (blocks) {
 446                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 447                         (blocks << sb->s_blocksize_bits);
 448                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 449                                  last_ext->extLength, 1) == -1)
 450                         return -1;
 451                 count++;
 452         }
 453
 454 out:
 455         /* Do we have some preallocated blocks saved? */
 456         if (prealloc_len) {
 457                 if (udf_add_aext(inode, last_pos, prealloc_loc,
 458                                  prealloc_len, 1) == -1)
 459                         return -1;
 460                 last_ext->extLocation = prealloc_loc;
 461                 last_ext->extLength = prealloc_len;
 462                 count++;
 463         }
 464
 465         /* last_pos should point to the last written extent... */
 466         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 467                 last_pos->offset -= sizeof(short_ad);
 468         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 469                 last_pos->offset -= sizeof(long_ad);
 470         else
 471                 return -1;
 472
 473         return count;
 474 }
 475
 476 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 477                                         int *err, sector_t *phys, int *new)
 478 {
 479         static sector_t last_block;
 480         struct buffer_head *result = NULL;
 481         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 482         struct extent_position prev_epos, cur_epos, next_epos;
 483         int count = 0, startnum = 0, endnum = 0;
 484         uint32_t elen = 0, tmpelen;
 485         kernel_lb_addr eloc, tmpeloc;
 486         int c = 1;
 487         loff_t lbcount = 0, b_off = 0;
 488         uint32_t newblocknum, newblock;
 489         sector_t offset = 0;
 490         int8_t etype;
 491         struct udf_inode_info *iinfo = UDF_I(inode);
 492         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 493         int lastblock = 0;
 494
 495         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 496         prev_epos.block = iinfo->i_location;
 497         prev_epos.bh = NULL;
 498         cur_epos = next_epos = prev_epos;
 499         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 500
 501         /* find the extent which contains the block we are looking for.
 502            alternate between laarr[0] and laarr[1] for locations of the
 503            current extent, and the previous extent */
 504         do {
 505                 if (prev_epos.bh != cur_epos.bh) {
 506                         brelse(prev_epos.bh);
 507                         get_bh(cur_epos.bh);
 508                         prev_epos.bh = cur_epos.bh;
 509                 }
 510                 if (cur_epos.bh != next_epos.bh) {
 511                         brelse(cur_epos.bh);
 512                         get_bh(next_epos.bh);
 513                         cur_epos.bh = next_epos.bh;
 514                 }
 515
 516                 lbcount += elen;
 517
 518                 prev_epos.block = cur_epos.block;
 519                 cur_epos.block = next_epos.block;
 520
 521                 prev_epos.offset = cur_epos.offset;
 522                 cur_epos.offset = next_epos.offset;
 523
 524                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 525                 if (etype == -1)
 526                         break;
 527
 528                 c = !c;
 529
 530                 laarr[c].extLength = (etype << 30) | elen;
 531                 laarr[c].extLocation = eloc;
 532
 533                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 534                         pgoal = eloc.logicalBlockNum +
 535                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 536                                  inode->i_sb->s_blocksize_bits);
 537
 538                 count++;
 539         } while (lbcount + elen <= b_off);
 540
 541         b_off -= lbcount;
 542         offset = b_off >> inode->i_sb->s_blocksize_bits;
 543         /*
 544          * Move prev_epos and cur_epos into indirect extent if we are at
 545          * the pointer to it
 546          */
 547         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 548         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 549
 550         /* if the extent is allocated and recorded, return the block
 551            if the extent is not a multiple of the blocksize, round up */
 552
 553         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 554                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 555                         elen = EXT_RECORDED_ALLOCATED |
 556                                 ((elen + inode->i_sb->s_blocksize - 1) &
 557                                  ~(inode->i_sb->s_blocksize - 1));
 558                         etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
 559                 }
 560                 brelse(prev_epos.bh);
 561                 brelse(cur_epos.bh);
 562                 brelse(next_epos.bh);
 563                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 564                 *phys = newblock;
 565                 return NULL;
 566         }
 567
 568         last_block = block;
 569         /* Are we beyond EOF? */
 570         if (etype == -1) {
 571                 int ret;
 572
 573                 if (count) {
 574                         if (c)
 575                                 laarr[0] = laarr[1];
 576                         startnum = 1;
 577                 } else {
 578                         /* Create a fake extent when there's not one */
 579                         memset(&laarr[0].extLocation, 0x00,
 580                                 sizeof(kernel_lb_addr));
 581                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 582                         /* Will udf_extend_file() create real extent from
 583                            a fake one? */
 584                         startnum = (offset > 0);
 585                 }
 586                 /* Create extents for the hole between EOF and offset */
 587                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 588                 if (ret == -1) {
 589                         brelse(prev_epos.bh);
 590                         brelse(cur_epos.bh);
 591                         brelse(next_epos.bh);
 592                         /* We don't really know the error here so we just make
 593                          * something up */
 594                         *err = -ENOSPC;
 595                         return NULL;
 596                 }
 597                 c = 0;
 598                 offset = 0;
 599                 count += ret;
 600                 /* We are not covered by a preallocated extent? */
 601                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 602                                                 EXT_NOT_RECORDED_ALLOCATED) {
 603                         /* Is there any real extent? - otherwise we overwrite
 604                          * the fake one... */
 605                         if (count)
 606                                 c = !c;
 607                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 608                                 inode->i_sb->s_blocksize;
 609                         memset(&laarr[c].extLocation, 0x00,
 610                                 sizeof(kernel_lb_addr));
 611                         count++;
 612                         endnum++;
 613                 }
 614                 endnum = c + 1;
 615                 lastblock = 1;
 616         } else {
 617                 endnum = startnum = ((count > 2) ? 2 : count);
 618
 619                 /* if the current extent is in position 0,
 620                    swap it with the previous */
 621                 if (!c && count != 1) {
 622                         laarr[2] = laarr[0];
 623                         laarr[0] = laarr[1];
 624                         laarr[1] = laarr[2];
 625                         c = 1;
 626                 }
 627
 628                 /* if the current block is located in an extent,
 629                    read the next extent */
 630                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 631                 if (etype != -1) {
 632                         laarr[c + 1].extLength = (etype << 30) | elen;
 633                         laarr[c + 1].extLocation = eloc;
 634                         count++;
 635                         startnum++;
 636                         endnum++;
 637                 } else
 638                         lastblock = 1;
 639         }
 640
 641         /* if the current extent is not recorded but allocated, get the
 642          * block in the extent corresponding to the requested block */
 643         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 644                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 645         else { /* otherwise, allocate a new block */
 646                 if (iinfo->i_next_alloc_block == block)
 647                         goal = iinfo->i_next_alloc_goal;
 648
 649                 if (!goal) {
 650                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 651                                 goal = iinfo->i_location.logicalBlockNum + 1;
 652                 }
 653
 654                 newblocknum = udf_new_block(inode->i_sb, inode,
 655                                 iinfo->i_location.partitionReferenceNum,
 656                                 goal, err);
 657                 if (!newblocknum) {
 658                         brelse(prev_epos.bh);
 659                         *err = -ENOSPC;
 660                         return NULL;
 661                 }
 662                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 663         }
 664
 665         /* if the extent the requsted block is located in contains multiple
 666          * blocks, split the extent into at most three extents. blocks prior
 667          * to requested block, requested block, and blocks after requested
 668          * block */
 669         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 670
 671 #ifdef UDF_PREALLOCATE
 672         /* preallocate blocks */
 673         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 674 #endif
 675
 676         /* merge any continuous blocks in laarr */
 677         udf_merge_extents(inode, laarr, &endnum);
 678
 679         /* write back the new extents, inserting new extents if the new number
 680          * of extents is greater than the old number, and deleting extents if
 681          * the new number of extents is less than the old number */
 682         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 683
 684         brelse(prev_epos.bh);
 685
 686         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 687                                 iinfo->i_location.partitionReferenceNum, 0);
 688         if (!newblock)
 689                 return NULL;
 690         *phys = newblock;
 691         *err = 0;
 692         *new = 1;
 693         iinfo->i_next_alloc_block = block;
 694         iinfo->i_next_alloc_goal = newblocknum;
 695         inode->i_ctime = current_fs_time(inode->i_sb);
 696
 697         if (IS_SYNC(inode))
 698                 udf_sync_inode(inode);
 699         else
 700                 mark_inode_dirty(inode);
 701
 702         return result;
 703 }
 704
 705 static void udf_split_extents(struct inode *inode, int *c, int offset,
 706                               int newblocknum,
 707                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 708                               int *endnum)
 709 {
 710         unsigned long blocksize = inode->i_sb->s_blocksize;
 711         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 712
 713         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 714             (laarr[*c].extLength >> 30) ==
 715                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 716                 int curr = *c;
 717                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 718                             blocksize - 1) >> blocksize_bits;
 719                 int8_t etype = (laarr[curr].extLength >> 30);
 720
 721                 if (blen == 1)
 722                         ;
 723                 else if (!offset || blen == offset + 1) {
 724                         laarr[curr + 2] = laarr[curr + 1];
 725                         laarr[curr + 1] = laarr[curr];
 726                 } else {
 727                         laarr[curr + 3] = laarr[curr + 1];
 728                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 729                 }
 730
 731                 if (offset) {
 732                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 733                                 udf_free_blocks(inode->i_sb, inode,
 734                                                 laarr[curr].extLocation,
 735                                                 0, offset);
 736                                 laarr[curr].extLength =
 737                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 738                                         (offset << blocksize_bits);
 739                                 laarr[curr].extLocation.logicalBlockNum = 0;
 740                                 laarr[curr].extLocation.
 741                                                 partitionReferenceNum = 0;
 742                         } else
 743                                 laarr[curr].extLength = (etype << 30) |
 744                                         (offset << blocksize_bits);
 745                         curr++;
 746                         (*c)++;
 747                         (*endnum)++;
 748                 }
 749
 750                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 751                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 752                         laarr[curr].extLocation.partitionReferenceNum =
 753                                 UDF_I(inode)->i_location.partitionReferenceNum;
 754                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 755                         blocksize;
 756                 curr++;
 757
 758                 if (blen != offset + 1) {
 759                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 760                                 laarr[curr].extLocation.logicalBlockNum +=
 761                                                                 offset + 1;
 762                         laarr[curr].extLength = (etype << 30) |
 763                                 ((blen - (offset + 1)) << blocksize_bits);
 764                         curr++;
 765                         (*endnum)++;
 766                 }
 767         }
 768 }
 769
 770 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 771                                  kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 772                                  int *endnum)
 773 {
 774         int start, length = 0, currlength = 0, i;
 775
 776         if (*endnum >= (c + 1)) {
 777                 if (!lastblock)
 778                         return;
 779                 else
 780                         start = c;
 781         } else {
 782                 if ((laarr[c + 1].extLength >> 30) ==
 783                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 784                         start = c + 1;
 785                         length = currlength =
 786                                 (((laarr[c + 1].extLength &
 787                                         UDF_EXTENT_LENGTH_MASK) +
 788                                 inode->i_sb->s_blocksize - 1) >>
 789                                 inode->i_sb->s_blocksize_bits);
 790                 } else
 791                         start = c;
 792         }
 793
 794         for (i = start + 1; i <= *endnum; i++) {
 795                 if (i == *endnum) {
 796                         if (lastblock)
 797                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 798                 } else if ((laarr[i].extLength >> 30) ==
 799                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 800                         length += (((laarr[i].extLength &
 801                                                 UDF_EXTENT_LENGTH_MASK) +
 802                                     inode->i_sb->s_blocksize - 1) >>
 803                                     inode->i_sb->s_blocksize_bits);
 804                 } else
 805                         break;
 806         }
 807
 808         if (length) {
 809                 int next = laarr[start].extLocation.logicalBlockNum +
 810                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 811                           inode->i_sb->s_blocksize - 1) >>
 812                           inode->i_sb->s_blocksize_bits);
 813                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 814                                 laarr[start].extLocation.partitionReferenceNum,
 815                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 816                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 817                                 currlength);
 818                 if (numalloc)   {
 819                         if (start == (c + 1))
 820                                 laarr[start].extLength +=
 821                                         (numalloc <<
 822                                          inode->i_sb->s_blocksize_bits);
 823                         else {
 824                                 memmove(&laarr[c + 2], &laarr[c + 1],
 825                                         sizeof(long_ad) * (*endnum - (c + 1)));
 826                                 (*endnum)++;
 827                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 828                                 laarr[c + 1].extLocation.partitionReferenceNum =
 829                                         laarr[c].extLocation.
 830                                                         partitionReferenceNum;
 831                                 laarr[c + 1].extLength =
 832                                         EXT_NOT_RECORDED_ALLOCATED |
 833                                         (numalloc <<
 834                                          inode->i_sb->s_blocksize_bits);
 835                                 start = c + 1;
 836                         }
 837
 838                         for (i = start + 1; numalloc && i < *endnum; i++) {
 839                                 int elen = ((laarr[i].extLength &
 840                                                 UDF_EXTENT_LENGTH_MASK) +
 841                                             inode->i_sb->s_blocksize - 1) >>
 842                                             inode->i_sb->s_blocksize_bits;
 843
 844                                 if (elen > numalloc) {
 845                                         laarr[i].extLength -=
 846                                                 (numalloc <<
 847                                                  inode->i_sb->s_blocksize_bits);
 848                                         numalloc = 0;
 849                                 } else {
 850                                         numalloc -= elen;
 851                                         if (*endnum > (i + 1))
 852                                                 memmove(&laarr[i],
 853                                                         &laarr[i + 1],
 854                                                         sizeof(long_ad) *
 855                                                         (*endnum - (i + 1)));
 856                                         i--;
 857                                         (*endnum)--;
 858                                 }
 859                         }
 860                         UDF_I(inode)->i_lenExtents +=
 861                                 numalloc << inode->i_sb->s_blocksize_bits;
 862                 }
 863         }
 864 }
 865
 866 static void udf_merge_extents(struct inode *inode,
 867                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 868                               int *endnum)
 869 {
 870         int i;
 871         unsigned long blocksize = inode->i_sb->s_blocksize;
 872         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 873
 874         for (i = 0; i < (*endnum - 1); i++) {
 875                 kernel_long_ad *li /*l[i]*/ = &laarr[i];
 876                 kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 877
 878                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 879                         (((li->extLength >> 30) ==
 880                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 881                         ((lip1->extLocation.logicalBlockNum -
 882                           li->extLocation.logicalBlockNum) ==
 883                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 884                         blocksize - 1) >> blocksize_bits)))) {
 885
 886                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 887                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 888                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 889                                 lip1->extLength = (lip1->extLength -
 890                                                   (li->extLength &
 891                                                    UDF_EXTENT_LENGTH_MASK) +
 892                                                    UDF_EXTENT_LENGTH_MASK) &
 893                                                         ~(blocksize - 1);
 894                                 li->extLength = (li->extLength &
 895                                                  UDF_EXTENT_FLAG_MASK) +
 896                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 897                                                 blocksize;
 898                                 lip1->extLocation.logicalBlockNum =
 899                                         li->extLocation.logicalBlockNum +
 900                                         ((li->extLength &
 901                                                 UDF_EXTENT_LENGTH_MASK) >>
 902                                                 blocksize_bits);
 903                         } else {
 904                                 li->extLength = lip1->extLength +
 905                                         (((li->extLength &
 906                                                 UDF_EXTENT_LENGTH_MASK) +
 907                                          blocksize - 1) & ~(blocksize - 1));
 908                                 if (*endnum > (i + 2))
 909                                         memmove(&laarr[i + 1], &laarr[i + 2],
 910                                                 sizeof(long_ad) *
 911                                                 (*endnum - (i + 2)));
 912                                 i--;
 913                                 (*endnum)--;
 914                         }
 915                 } else if (((li->extLength >> 30) ==
 916                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 917                            ((lip1->extLength >> 30) ==
 918                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 919                         udf_free_blocks(inode->i_sb, inode, li->extLocation, 0,
 920                                         ((li->extLength &
 921                                           UDF_EXTENT_LENGTH_MASK) +
 922                                          blocksize - 1) >> blocksize_bits);
 923                         li->extLocation.logicalBlockNum = 0;
 924                         li->extLocation.partitionReferenceNum = 0;
 925
 926                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 927                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 928                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 929                                 lip1->extLength = (lip1->extLength -
 930                                                    (li->extLength &
 931                                                    UDF_EXTENT_LENGTH_MASK) +
 932                                                    UDF_EXTENT_LENGTH_MASK) &
 933                                                    ~(blocksize - 1);
 934                                 li->extLength = (li->extLength &
 935                                                  UDF_EXTENT_FLAG_MASK) +
 936                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 937                                                 blocksize;
 938                         } else {
 939                                 li->extLength = lip1->extLength +
 940                                         (((li->extLength &
 941                                                 UDF_EXTENT_LENGTH_MASK) +
 942                                           blocksize - 1) & ~(blocksize - 1));
 943                                 if (*endnum > (i + 2))
 944                                         memmove(&laarr[i + 1], &laarr[i + 2],
 945                                                 sizeof(long_ad) *
 946                                                 (*endnum - (i + 2)));
 947                                 i--;
 948                                 (*endnum)--;
 949                         }
 950                 } else if ((li->extLength >> 30) ==
 951                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 952                         udf_free_blocks(inode->i_sb, inode,
 953                                         li->extLocation, 0,
 954                                         ((li->extLength &
 955                                                 UDF_EXTENT_LENGTH_MASK) +
 956                                          blocksize - 1) >> blocksize_bits);
 957                         li->extLocation.logicalBlockNum = 0;
 958                         li->extLocation.partitionReferenceNum = 0;
 959                         li->extLength = (li->extLength &
 960                                                 UDF_EXTENT_LENGTH_MASK) |
 961                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 962                 }
 963         }
 964 }
 965
 966 static void udf_update_extents(struct inode *inode,
 967                                kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 968                                int startnum, int endnum,
 969                                struct extent_position *epos)
 970 {
 971         int start = 0, i;
 972         kernel_lb_addr tmploc;
 973         uint32_t tmplen;
 974
 975         if (startnum > endnum) {
 976                 for (i = 0; i < (startnum - endnum); i++)
 977                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 978                                         laarr[i].extLength);
 979         } else if (startnum < endnum) {
 980                 for (i = 0; i < (endnum - startnum); i++) {
 981                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 982                                         laarr[i].extLength);
 983                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 984                                       &laarr[i].extLength, 1);
 985                         start++;
 986                 }
 987         }
 988
 989         for (i = start; i < endnum; i++) {
 990                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 991                 udf_write_aext(inode, epos, laarr[i].extLocation,
 992                                laarr[i].extLength, 1);
 993         }
 994 }
 995
 996 struct buffer_head *udf_bread(struct inode *inode, int block,
 997                               int create, int *err)
 998 {
 999         struct buffer_head *bh = NULL;
1000
1001         bh = udf_getblk(inode, block, create, err);
1002         if (!bh)
1003                 return NULL;
1004
1005         if (buffer_uptodate(bh))
1006                 return bh;
1007
1008         ll_rw_block(READ, 1, &bh);
1009
1010         wait_on_buffer(bh);
1011         if (buffer_uptodate(bh))
1012                 return bh;
1013
1014         brelse(bh);
1015         *err = -EIO;
1016         return NULL;
1017 }
1018
1019 void udf_truncate(struct inode *inode)
1020 {
1021         int offset;
1022         int err;
1023         struct udf_inode_info *iinfo;
1024
1025         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1026               S_ISLNK(inode->i_mode)))
1027                 return;
1028         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1029                 return;
1030
1031         lock_kernel();
1032         iinfo = UDF_I(inode);
1033         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1034                 if (inode->i_sb->s_blocksize <
1035                                 (udf_file_entry_alloc_offset(inode) +
1036                                  inode->i_size)) {
1037                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1038                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1039                                 inode->i_size = iinfo->i_lenAlloc;
1040                                 unlock_kernel();
1041                                 return;
1042                         } else
1043                                 udf_truncate_extents(inode);
1044                 } else {
1045                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1046                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1047                                 0x00, inode->i_sb->s_blocksize -
1048                                 offset - udf_file_entry_alloc_offset(inode));
1049                         iinfo->i_lenAlloc = inode->i_size;
1050                 }
1051         } else {
1052                 block_truncate_page(inode->i_mapping, inode->i_size,
1053                                     udf_get_block);
1054                 udf_truncate_extents(inode);
1055         }
1056
1057         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1058         if (IS_SYNC(inode))
1059                 udf_sync_inode(inode);
1060         else
1061                 mark_inode_dirty(inode);
1062         unlock_kernel();
1063 }
1064
1065 static void __udf_read_inode(struct inode *inode)
1066 {
1067         struct buffer_head *bh = NULL;
1068         struct fileEntry *fe;
1069         uint16_t ident;
1070         struct udf_inode_info *iinfo = UDF_I(inode);
1071
1072         /*
1073          * Set defaults, but the inode is still incomplete!
1074          * Note: get_new_inode() sets the following on a new inode:
1075          *      i_sb = sb
1076          *      i_no = ino
1077          *      i_flags = sb->s_flags
1078          *      i_state = 0
1079          * clean_inode(): zero fills and sets
1080          *      i_count = 1
1081          *      i_nlink = 1
1082          *      i_op = NULL;
1083          */
1084         bh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 0, &ident);
1085         if (!bh) {
1086                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1087                        inode->i_ino);
1088                 make_bad_inode(inode);
1089                 return;
1090         }
1091
1092         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1093             ident != TAG_IDENT_USE) {
1094                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1095                                 "failed ident=%d\n", inode->i_ino, ident);
1096                 brelse(bh);
1097                 make_bad_inode(inode);
1098                 return;
1099         }
1100
1101         fe = (struct fileEntry *)bh->b_data;
1102
1103         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1104                 struct buffer_head *ibh = NULL, *nbh = NULL;
1105                 struct indirectEntry *ie;
1106
1107                 ibh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 1,
1108                                         &ident);
1109                 if (ident == TAG_IDENT_IE) {
1110                         if (ibh) {
1111                                 kernel_lb_addr loc;
1112                                 ie = (struct indirectEntry *)ibh->b_data;
1113
1114                                 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1115
1116                                 if (ie->indirectICB.extLength &&
1117                                     (nbh = udf_read_ptagged(inode->i_sb, loc, 0,
1118                                                             &ident))) {
1119                                         if (ident == TAG_IDENT_FE ||
1120                                             ident == TAG_IDENT_EFE) {
1121                                                 memcpy(&iinfo->i_location,
1122                                                        &loc,
1123                                                        sizeof(kernel_lb_addr));
1124                                                 brelse(bh);
1125                                                 brelse(ibh);
1126                                                 brelse(nbh);
1127                                                 __udf_read_inode(inode);
1128                                                 return;
1129                                         } else {
1130                                                 brelse(nbh);
1131                                                 brelse(ibh);
1132                                         }
1133                                 } else {
1134                                         brelse(ibh);
1135                                 }
1136                         }
1137                 } else {
1138                         brelse(ibh);
1139                 }
1140         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1141                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1142                        le16_to_cpu(fe->icbTag.strategyType));
1143                 brelse(bh);
1144                 make_bad_inode(inode);
1145                 return;
1146         }
1147         udf_fill_inode(inode, bh);
1148
1149         brelse(bh);
1150 }
1151
1152 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1153 {
1154         struct fileEntry *fe;
1155         struct extendedFileEntry *efe;
1156         time_t convtime;
1157         long convtime_usec;
1158         int offset;
1159         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1160         struct udf_inode_info *iinfo = UDF_I(inode);
1161
1162         fe = (struct fileEntry *)bh->b_data;
1163         efe = (struct extendedFileEntry *)bh->b_data;
1164
1165         if (fe->icbTag.strategyType == cpu_to_le16(4))
1166                 iinfo->i_strat4096 = 0;
1167         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1168                 iinfo->i_strat4096 = 1;
1169
1170         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1171                                                         ICBTAG_FLAG_AD_MASK;
1172         iinfo->i_unique = 0;
1173         iinfo->i_lenEAttr = 0;
1174         iinfo->i_lenExtents = 0;
1175         iinfo->i_lenAlloc = 0;
1176         iinfo->i_next_alloc_block = 0;
1177         iinfo->i_next_alloc_goal = 0;
1178         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1179                 iinfo->i_efe = 1;
1180                 iinfo->i_use = 0;
1181                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1182                                         sizeof(struct extendedFileEntry))) {
1183                         make_bad_inode(inode);
1184                         return;
1185                 }
1186                 memcpy(iinfo->i_ext.i_data,
1187                        bh->b_data + sizeof(struct extendedFileEntry),
1188                        inode->i_sb->s_blocksize -
1189                                         sizeof(struct extendedFileEntry));
1190         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1191                 iinfo->i_efe = 0;
1192                 iinfo->i_use = 0;
1193                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1194                                                 sizeof(struct fileEntry))) {
1195                         make_bad_inode(inode);
1196                         return;
1197                 }
1198                 memcpy(iinfo->i_ext.i_data,
1199                        bh->b_data + sizeof(struct fileEntry),
1200                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1201         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1202                 iinfo->i_efe = 0;
1203                 iinfo->i_use = 1;
1204                 iinfo->i_lenAlloc = le32_to_cpu(
1205                                 ((struct unallocSpaceEntry *)bh->b_data)->
1206                                  lengthAllocDescs);
1207                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1208                                         sizeof(struct unallocSpaceEntry))) {
1209                         make_bad_inode(inode);
1210                         return;
1211                 }
1212                 memcpy(iinfo->i_ext.i_data,
1213                        bh->b_data + sizeof(struct unallocSpaceEntry),
1214                        inode->i_sb->s_blocksize -
1215                                         sizeof(struct unallocSpaceEntry));
1216                 return;
1217         }
1218
1219         inode->i_uid = le32_to_cpu(fe->uid);
1220         if (inode->i_uid == -1 ||
1221             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1222             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1223                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1224
1225         inode->i_gid = le32_to_cpu(fe->gid);
1226         if (inode->i_gid == -1 ||
1227             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1228             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1229                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1230
1231         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1232         if (!inode->i_nlink)
1233                 inode->i_nlink = 1;
1234
1235         inode->i_size = le64_to_cpu(fe->informationLength);
1236         iinfo->i_lenExtents = inode->i_size;
1237
1238         inode->i_mode = udf_convert_permissions(fe);
1239         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1240
1241         if (iinfo->i_efe == 0) {
1242                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1243                         (inode->i_sb->s_blocksize_bits - 9);
1244
1245                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1246                                       lets_to_cpu(fe->accessTime))) {
1247                         inode->i_atime.tv_sec = convtime;
1248                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1249                 } else {
1250                         inode->i_atime = sbi->s_record_time;
1251                 }
1252
1253                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1254                                       lets_to_cpu(fe->modificationTime))) {
1255                         inode->i_mtime.tv_sec = convtime;
1256                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1257                 } else {
1258                         inode->i_mtime = sbi->s_record_time;
1259                 }
1260
1261                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1262                                       lets_to_cpu(fe->attrTime))) {
1263                         inode->i_ctime.tv_sec = convtime;
1264                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1265                 } else {
1266                         inode->i_ctime = sbi->s_record_time;
1267                 }
1268
1269                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1270                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1271                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1272                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1273         } else {
1274                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1275                     (inode->i_sb->s_blocksize_bits - 9);
1276
1277                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1278                                       lets_to_cpu(efe->accessTime))) {
1279                         inode->i_atime.tv_sec = convtime;
1280                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1281                 } else {
1282                         inode->i_atime = sbi->s_record_time;
1283                 }
1284
1285                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1286                                       lets_to_cpu(efe->modificationTime))) {
1287                         inode->i_mtime.tv_sec = convtime;
1288                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1289                 } else {
1290                         inode->i_mtime = sbi->s_record_time;
1291                 }
1292
1293                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1294                                       lets_to_cpu(efe->createTime))) {
1295                         iinfo->i_crtime.tv_sec = convtime;
1296                         iinfo->i_crtime.tv_nsec = convtime_usec * 1000;
1297                 } else {
1298                         iinfo->i_crtime = sbi->s_record_time;
1299                 }
1300
1301                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1302                                       lets_to_cpu(efe->attrTime))) {
1303                         inode->i_ctime.tv_sec = convtime;
1304                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1305                 } else {
1306                         inode->i_ctime = sbi->s_record_time;
1307                 }
1308
1309                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1310                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1311                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1312                 offset = sizeof(struct extendedFileEntry) +
1313                                                         iinfo->i_lenEAttr;
1314         }
1315
1316         switch (fe->icbTag.fileType) {
1317         case ICBTAG_FILE_TYPE_DIRECTORY:
1318                 inode->i_op = &udf_dir_inode_operations;
1319                 inode->i_fop = &udf_dir_operations;
1320                 inode->i_mode |= S_IFDIR;
1321                 inc_nlink(inode);
1322                 break;
1323         case ICBTAG_FILE_TYPE_REALTIME:
1324         case ICBTAG_FILE_TYPE_REGULAR:
1325         case ICBTAG_FILE_TYPE_UNDEF:
1326                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1327                         inode->i_data.a_ops = &udf_adinicb_aops;
1328                 else
1329                         inode->i_data.a_ops = &udf_aops;
1330                 inode->i_op = &udf_file_inode_operations;
1331                 inode->i_fop = &udf_file_operations;
1332                 inode->i_mode |= S_IFREG;
1333                 break;
1334         case ICBTAG_FILE_TYPE_BLOCK:
1335                 inode->i_mode |= S_IFBLK;
1336                 break;
1337         case ICBTAG_FILE_TYPE_CHAR:
1338                 inode->i_mode |= S_IFCHR;
1339                 break;
1340         case ICBTAG_FILE_TYPE_FIFO:
1341                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1342                 break;
1343         case ICBTAG_FILE_TYPE_SOCKET:
1344                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1345                 break;
1346         case ICBTAG_FILE_TYPE_SYMLINK:
1347                 inode->i_data.a_ops = &udf_symlink_aops;
1348                 inode->i_op = &page_symlink_inode_operations;
1349                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1350                 break;
1351         default:
1352                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1353                                 "file type=%d\n", inode->i_ino,
1354                                 fe->icbTag.fileType);
1355                 make_bad_inode(inode);
1356                 return;
1357         }
1358         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1359                 struct deviceSpec *dsea =
1360                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1361                 if (dsea) {
1362                         init_special_inode(inode, inode->i_mode,
1363                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1364                                       le32_to_cpu(dsea->minorDeviceIdent)));
1365                         /* Developer ID ??? */
1366                 } else
1367                         make_bad_inode(inode);
1368         }
1369 }
1370
1371 static int udf_alloc_i_data(struct inode *inode, size_t size)
1372 {
1373         struct udf_inode_info *iinfo = UDF_I(inode);
1374         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1375
1376         if (!iinfo->i_ext.i_data) {
1377                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1378                                 "no free memory\n", inode->i_ino);
1379                 return -ENOMEM;
1380         }
1381
1382         return 0;
1383 }
1384
1385 static mode_t udf_convert_permissions(struct fileEntry *fe)
1386 {
1387         mode_t mode;
1388         uint32_t permissions;
1389         uint32_t flags;
1390
1391         permissions = le32_to_cpu(fe->permissions);
1392         flags = le16_to_cpu(fe->icbTag.flags);
1393
1394         mode =  ((permissions) & S_IRWXO) |
1395                 ((permissions >> 2) & S_IRWXG) |
1396                 ((permissions >> 4) & S_IRWXU) |
1397                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1398                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1399                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1400
1401         return mode;
1402 }
1403
1404 int udf_write_inode(struct inode *inode, int sync)
1405 {
1406         int ret;
1407
1408         lock_kernel();
1409         ret = udf_update_inode(inode, sync);
1410         unlock_kernel();
1411
1412         return ret;
1413 }
1414
1415 int udf_sync_inode(struct inode *inode)
1416 {
1417         return udf_update_inode(inode, 1);
1418 }
1419
1420 static int udf_update_inode(struct inode *inode, int do_sync)
1421 {
1422         struct buffer_head *bh = NULL;
1423         struct fileEntry *fe;
1424         struct extendedFileEntry *efe;
1425         uint32_t udfperms;
1426         uint16_t icbflags;
1427         uint16_t crclen;
1428         kernel_timestamp cpu_time;
1429         int err = 0;
1430         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1431         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1432         struct udf_inode_info *iinfo = UDF_I(inode);
1433
1434         bh = udf_tread(inode->i_sb,
1435                         udf_get_lb_pblock(inode->i_sb,
1436                                           iinfo->i_location, 0));
1437         if (!bh) {
1438                 udf_debug("bread failure\n");
1439                 return -EIO;
1440         }
1441
1442         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1443
1444         fe = (struct fileEntry *)bh->b_data;
1445         efe = (struct extendedFileEntry *)bh->b_data;
1446
1447         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1448                 struct unallocSpaceEntry *use =
1449                         (struct unallocSpaceEntry *)bh->b_data;
1450
1451                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1452                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1453                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1454                                         sizeof(struct unallocSpaceEntry));
1455                 crclen = sizeof(struct unallocSpaceEntry) +
1456                                 iinfo->i_lenAlloc - sizeof(tag);
1457                 use->descTag.tagLocation = cpu_to_le32(
1458                                                 iinfo->i_location.
1459                                                         logicalBlockNum);
1460                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1461                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use +
1462                                                            sizeof(tag), crclen,
1463                                                            0));
1464                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1465
1466                 mark_buffer_dirty(bh);
1467                 brelse(bh);
1468                 return err;
1469         }
1470
1471         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1472                 fe->uid = cpu_to_le32(-1);
1473         else
1474                 fe->uid = cpu_to_le32(inode->i_uid);
1475
1476         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1477                 fe->gid = cpu_to_le32(-1);
1478         else
1479                 fe->gid = cpu_to_le32(inode->i_gid);
1480
1481         udfperms = ((inode->i_mode & S_IRWXO)) |
1482                    ((inode->i_mode & S_IRWXG) << 2) |
1483                    ((inode->i_mode & S_IRWXU) << 4);
1484
1485         udfperms |= (le32_to_cpu(fe->permissions) &
1486                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1487                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1488                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1489         fe->permissions = cpu_to_le32(udfperms);
1490
1491         if (S_ISDIR(inode->i_mode))
1492                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1493         else
1494                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1495
1496         fe->informationLength = cpu_to_le64(inode->i_size);
1497
1498         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1499                 regid *eid;
1500                 struct deviceSpec *dsea =
1501                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1502                 if (!dsea) {
1503                         dsea = (struct deviceSpec *)
1504                                 udf_add_extendedattr(inode,
1505                                                      sizeof(struct deviceSpec) +
1506                                                      sizeof(regid), 12, 0x3);
1507                         dsea->attrType = cpu_to_le32(12);
1508                         dsea->attrSubtype = 1;
1509                         dsea->attrLength = cpu_to_le32(
1510                                                 sizeof(struct deviceSpec) +
1511                                                 sizeof(regid));
1512                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1513                 }
1514                 eid = (regid *)dsea->impUse;
1515                 memset(eid, 0, sizeof(regid));
1516                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1517                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1518                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1519                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1520                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1521         }
1522
1523         if (iinfo->i_efe == 0) {
1524                 memcpy(bh->b_data + sizeof(struct fileEntry),
1525                        iinfo->i_ext.i_data,
1526                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1527                 fe->logicalBlocksRecorded = cpu_to_le64(
1528                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1529                         (blocksize_bits - 9));
1530
1531                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1532                         fe->accessTime = cpu_to_lets(cpu_time);
1533                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1534                         fe->modificationTime = cpu_to_lets(cpu_time);
1535                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1536                         fe->attrTime = cpu_to_lets(cpu_time);
1537                 memset(&(fe->impIdent), 0, sizeof(regid));
1538                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1539                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1540                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1541                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1542                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1543                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1544                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1545                 crclen = sizeof(struct fileEntry);
1546         } else {
1547                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1548                        iinfo->i_ext.i_data,
1549                        inode->i_sb->s_blocksize -
1550                                         sizeof(struct extendedFileEntry));
1551                 efe->objectSize = cpu_to_le64(inode->i_size);
1552                 efe->logicalBlocksRecorded = cpu_to_le64(
1553                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1554                         (blocksize_bits - 9));
1555
1556                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1557                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1558                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1559                         iinfo->i_crtime = inode->i_atime;
1560
1561                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1562                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1563                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1564                         iinfo->i_crtime = inode->i_mtime;
1565
1566                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1567                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1568                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1569                         iinfo->i_crtime = inode->i_ctime;
1570
1571                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1572                         efe->accessTime = cpu_to_lets(cpu_time);
1573                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1574                         efe->modificationTime = cpu_to_lets(cpu_time);
1575                 if (udf_time_to_stamp(&cpu_time, iinfo->i_crtime))
1576                         efe->createTime = cpu_to_lets(cpu_time);
1577                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1578                         efe->attrTime = cpu_to_lets(cpu_time);
1579
1580                 memset(&(efe->impIdent), 0, sizeof(regid));
1581                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1582                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1583                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1584                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1585                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1586                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1587                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1588                 crclen = sizeof(struct extendedFileEntry);
1589         }
1590         if (iinfo->i_strat4096) {
1591                 fe->icbTag.strategyType = cpu_to_le16(4096);
1592                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1593                 fe->icbTag.numEntries = cpu_to_le16(2);
1594         } else {
1595                 fe->icbTag.strategyType = cpu_to_le16(4);
1596                 fe->icbTag.numEntries = cpu_to_le16(1);
1597         }
1598
1599         if (S_ISDIR(inode->i_mode))
1600                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1601         else if (S_ISREG(inode->i_mode))
1602                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1603         else if (S_ISLNK(inode->i_mode))
1604                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1605         else if (S_ISBLK(inode->i_mode))
1606                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1607         else if (S_ISCHR(inode->i_mode))
1608                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1609         else if (S_ISFIFO(inode->i_mode))
1610                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1611         else if (S_ISSOCK(inode->i_mode))
1612                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1613
1614         icbflags =      iinfo->i_alloc_type |
1615                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1616                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1617                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1618                         (le16_to_cpu(fe->icbTag.flags) &
1619                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1620                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1621
1622         fe->icbTag.flags = cpu_to_le16(icbflags);
1623         if (sbi->s_udfrev >= 0x0200)
1624                 fe->descTag.descVersion = cpu_to_le16(3);
1625         else
1626                 fe->descTag.descVersion = cpu_to_le16(2);
1627         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1628         fe->descTag.tagLocation = cpu_to_le32(
1629                                         iinfo->i_location.logicalBlockNum);
1630         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1631                                                                 sizeof(tag);
1632         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1633         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag),
1634                                                   crclen, 0));
1635         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1636
1637         /* write the data blocks */
1638         mark_buffer_dirty(bh);
1639         if (do_sync) {
1640                 sync_dirty_buffer(bh);
1641                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1642                         printk(KERN_WARNING "IO error syncing udf inode "
1643                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1644                                 inode->i_ino);
1645                         err = -EIO;
1646                 }
1647         }
1648         brelse(bh);
1649
1650         return err;
1651 }
1652
1653 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1654 {
1655         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1656         struct inode *inode = iget_locked(sb, block);
1657
1658         if (!inode)
1659                 return NULL;
1660
1661         if (inode->i_state & I_NEW) {
1662                 memcpy(&UDF_I(inode)->i_location, &ino, sizeof(kernel_lb_addr));
1663                 __udf_read_inode(inode);
1664                 unlock_new_inode(inode);
1665         }
1666
1667         if (is_bad_inode(inode))
1668                 goto out_iput;
1669
1670         if (ino.logicalBlockNum >= UDF_SB(sb)->
1671                         s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1672                 udf_debug("block=%d, partition=%d out of range\n",
1673                           ino.logicalBlockNum, ino.partitionReferenceNum);
1674                 make_bad_inode(inode);
1675                 goto out_iput;
1676         }
1677
1678         return inode;
1679
1680  out_iput:
1681         iput(inode);
1682         return NULL;
1683 }
1684
1685 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1686                     kernel_lb_addr eloc, uint32_t elen, int inc)
1687 {
1688         int adsize;
1689         short_ad *sad = NULL;
1690         long_ad *lad = NULL;
1691         struct allocExtDesc *aed;
1692         int8_t etype;
1693         uint8_t *ptr;
1694         struct udf_inode_info *iinfo = UDF_I(inode);
1695
1696         if (!epos->bh)
1697                 ptr = iinfo->i_ext.i_data + epos->offset -
1698                         udf_file_entry_alloc_offset(inode) +
1699                         iinfo->i_lenEAttr;
1700         else
1701                 ptr = epos->bh->b_data + epos->offset;
1702
1703         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1704                 adsize = sizeof(short_ad);
1705         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1706                 adsize = sizeof(long_ad);
1707         else
1708                 return -1;
1709
1710         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1711                 char *sptr, *dptr;
1712                 struct buffer_head *nbh;
1713                 int err, loffset;
1714                 kernel_lb_addr obloc = epos->block;
1715
1716                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1717                                                 obloc.partitionReferenceNum,
1718                                                 obloc.logicalBlockNum, &err);
1719                 if (!epos->block.logicalBlockNum)
1720                         return -1;
1721                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1722                                                                  epos->block,
1723                                                                  0));
1724                 if (!nbh)
1725                         return -1;
1726                 lock_buffer(nbh);
1727                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1728                 set_buffer_uptodate(nbh);
1729                 unlock_buffer(nbh);
1730                 mark_buffer_dirty_inode(nbh, inode);
1731
1732                 aed = (struct allocExtDesc *)(nbh->b_data);
1733                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1734                         aed->previousAllocExtLocation =
1735                                         cpu_to_le32(obloc.logicalBlockNum);
1736                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1737                         loffset = epos->offset;
1738                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1739                         sptr = ptr - adsize;
1740                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1741                         memcpy(dptr, sptr, adsize);
1742                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1743                 } else {
1744                         loffset = epos->offset + adsize;
1745                         aed->lengthAllocDescs = cpu_to_le32(0);
1746                         sptr = ptr;
1747                         epos->offset = sizeof(struct allocExtDesc);
1748
1749                         if (epos->bh) {
1750                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1751                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1752                         } else {
1753                                 iinfo->i_lenAlloc += adsize;
1754                                 mark_inode_dirty(inode);
1755                         }
1756                 }
1757                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1758                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1759                                     epos->block.logicalBlockNum, sizeof(tag));
1760                 else
1761                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1762                                     epos->block.logicalBlockNum, sizeof(tag));
1763                 switch (iinfo->i_alloc_type) {
1764                 case ICBTAG_FLAG_AD_SHORT:
1765                         sad = (short_ad *)sptr;
1766                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1767                                                      inode->i_sb->s_blocksize);
1768                         sad->extPosition =
1769                                 cpu_to_le32(epos->block.logicalBlockNum);
1770                         break;
1771                 case ICBTAG_FLAG_AD_LONG:
1772                         lad = (long_ad *)sptr;
1773                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1774                                                      inode->i_sb->s_blocksize);
1775                         lad->extLocation = cpu_to_lelb(epos->block);
1776                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1777                         break;
1778                 }
1779                 if (epos->bh) {
1780                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1781                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1782                                 udf_update_tag(epos->bh->b_data, loffset);
1783                         else
1784                                 udf_update_tag(epos->bh->b_data,
1785                                                 sizeof(struct allocExtDesc));
1786                         mark_buffer_dirty_inode(epos->bh, inode);
1787                         brelse(epos->bh);
1788                 } else {
1789                         mark_inode_dirty(inode);
1790                 }
1791                 epos->bh = nbh;
1792         }
1793
1794         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1795
1796         if (!epos->bh) {
1797                 iinfo->i_lenAlloc += adsize;
1798                 mark_inode_dirty(inode);
1799         } else {
1800                 aed = (struct allocExtDesc *)epos->bh->b_data;
1801                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1802                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1803                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1804                         udf_update_tag(epos->bh->b_data,
1805                                         epos->offset + (inc ? 0 : adsize));
1806                 else
1807                         udf_update_tag(epos->bh->b_data,
1808                                         sizeof(struct allocExtDesc));
1809                 mark_buffer_dirty_inode(epos->bh, inode);
1810         }
1811
1812         return etype;
1813 }
1814
1815 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1816                       kernel_lb_addr eloc, uint32_t elen, int inc)
1817 {
1818         int adsize;
1819         uint8_t *ptr;
1820         short_ad *sad;
1821         long_ad *lad;
1822         struct udf_inode_info *iinfo = UDF_I(inode);
1823
1824         if (!epos->bh)
1825                 ptr = iinfo->i_ext.i_data + epos->offset -
1826                         udf_file_entry_alloc_offset(inode) +
1827                         iinfo->i_lenEAttr;
1828         else
1829                 ptr = epos->bh->b_data + epos->offset;
1830
1831         switch (iinfo->i_alloc_type) {
1832         case ICBTAG_FLAG_AD_SHORT:
1833                 sad = (short_ad *)ptr;
1834                 sad->extLength = cpu_to_le32(elen);
1835                 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1836                 adsize = sizeof(short_ad);
1837                 break;
1838         case ICBTAG_FLAG_AD_LONG:
1839                 lad = (long_ad *)ptr;
1840                 lad->extLength = cpu_to_le32(elen);
1841                 lad->extLocation = cpu_to_lelb(eloc);
1842                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1843                 adsize = sizeof(long_ad);
1844                 break;
1845         default:
1846                 return -1;
1847         }
1848
1849         if (epos->bh) {
1850                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1851                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1852                         struct allocExtDesc *aed =
1853                                 (struct allocExtDesc *)epos->bh->b_data;
1854                         udf_update_tag(epos->bh->b_data,
1855                                        le32_to_cpu(aed->lengthAllocDescs) +
1856                                        sizeof(struct allocExtDesc));
1857                 }
1858                 mark_buffer_dirty_inode(epos->bh, inode);
1859         } else {
1860                 mark_inode_dirty(inode);
1861         }
1862
1863         if (inc)
1864                 epos->offset += adsize;
1865
1866         return (elen >> 30);
1867 }
1868
1869 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1870                      kernel_lb_addr *eloc, uint32_t *elen, int inc)
1871 {
1872         int8_t etype;
1873
1874         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1875                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1876                 int block;
1877                 epos->block = *eloc;
1878                 epos->offset = sizeof(struct allocExtDesc);
1879                 brelse(epos->bh);
1880                 block = udf_get_lb_pblock(inode->i_sb, epos->block, 0);
1881                 epos->bh = udf_tread(inode->i_sb, block);
1882                 if (!epos->bh) {
1883                         udf_debug("reading block %d failed!\n", block);
1884                         return -1;
1885                 }
1886         }
1887
1888         return etype;
1889 }
1890
1891 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1892                         kernel_lb_addr *eloc, uint32_t *elen, int inc)
1893 {
1894         int alen;
1895         int8_t etype;
1896         uint8_t *ptr;
1897         short_ad *sad;
1898         long_ad *lad;
1899         struct udf_inode_info *iinfo = UDF_I(inode);
1900
1901         if (!epos->bh) {
1902                 if (!epos->offset)
1903                         epos->offset = udf_file_entry_alloc_offset(inode);
1904                 ptr = iinfo->i_ext.i_data + epos->offset -
1905                         udf_file_entry_alloc_offset(inode) +
1906                         iinfo->i_lenEAttr;
1907                 alen = udf_file_entry_alloc_offset(inode) +
1908                                                         iinfo->i_lenAlloc;
1909         } else {
1910                 if (!epos->offset)
1911                         epos->offset = sizeof(struct allocExtDesc);
1912                 ptr = epos->bh->b_data + epos->offset;
1913                 alen = sizeof(struct allocExtDesc) +
1914                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1915                                                         lengthAllocDescs);
1916         }
1917
1918         switch (iinfo->i_alloc_type) {
1919         case ICBTAG_FLAG_AD_SHORT:
1920                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1921                 if (!sad)
1922                         return -1;
1923                 etype = le32_to_cpu(sad->extLength) >> 30;
1924                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1925                 eloc->partitionReferenceNum =
1926                                 iinfo->i_location.partitionReferenceNum;
1927                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1928                 break;
1929         case ICBTAG_FLAG_AD_LONG:
1930                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1931                 if (!lad)
1932                         return -1;
1933                 etype = le32_to_cpu(lad->extLength) >> 30;
1934                 *eloc = lelb_to_cpu(lad->extLocation);
1935                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1936                 break;
1937         default:
1938                 udf_debug("alloc_type = %d unsupported\n",
1939                                 iinfo->i_alloc_type);
1940                 return -1;
1941         }
1942
1943         return etype;
1944 }
1945
1946 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1947                               kernel_lb_addr neloc, uint32_t nelen)
1948 {
1949         kernel_lb_addr oeloc;
1950         uint32_t oelen;
1951         int8_t etype;
1952
1953         if (epos.bh)
1954                 get_bh(epos.bh);
1955
1956         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1957                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1958                 neloc = oeloc;
1959                 nelen = (etype << 30) | oelen;
1960         }
1961         udf_add_aext(inode, &epos, neloc, nelen, 1);
1962         brelse(epos.bh);
1963
1964         return (nelen >> 30);
1965 }
1966
1967 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1968                        kernel_lb_addr eloc, uint32_t elen)
1969 {
1970         struct extent_position oepos;
1971         int adsize;
1972         int8_t etype;
1973         struct allocExtDesc *aed;
1974         struct udf_inode_info *iinfo;
1975
1976         if (epos.bh) {
1977                 get_bh(epos.bh);
1978                 get_bh(epos.bh);
1979         }
1980
1981         iinfo = UDF_I(inode);
1982         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1983                 adsize = sizeof(short_ad);
1984         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1985                 adsize = sizeof(long_ad);
1986         else
1987                 adsize = 0;
1988
1989         oepos = epos;
1990         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1991                 return -1;
1992
1993         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1994                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1995                 if (oepos.bh != epos.bh) {
1996                         oepos.block = epos.block;
1997                         brelse(oepos.bh);
1998                         get_bh(epos.bh);
1999                         oepos.bh = epos.bh;
2000                         oepos.offset = epos.offset - adsize;
2001                 }
2002         }
2003         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
2004         elen = 0;
2005
2006         if (epos.bh != oepos.bh) {
2007                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
2008                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2009                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2010                 if (!oepos.bh) {
2011                         iinfo->i_lenAlloc -= (adsize * 2);
2012                         mark_inode_dirty(inode);
2013                 } else {
2014                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2015                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2016                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2017                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2018                                 udf_update_tag(oepos.bh->b_data,
2019                                                 oepos.offset - (2 * adsize));
2020                         else
2021                                 udf_update_tag(oepos.bh->b_data,
2022                                                 sizeof(struct allocExtDesc));
2023                         mark_buffer_dirty_inode(oepos.bh, inode);
2024                 }
2025         } else {
2026                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2027                 if (!oepos.bh) {
2028                         iinfo->i_lenAlloc -= adsize;
2029                         mark_inode_dirty(inode);
2030                 } else {
2031                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2032                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2033                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2034                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2035                                 udf_update_tag(oepos.bh->b_data,
2036                                                 epos.offset - adsize);
2037                         else
2038                                 udf_update_tag(oepos.bh->b_data,
2039                                                 sizeof(struct allocExtDesc));
2040                         mark_buffer_dirty_inode(oepos.bh, inode);
2041                 }
2042         }
2043
2044         brelse(epos.bh);
2045         brelse(oepos.bh);
2046
2047         return (elen >> 30);
2048 }
2049
2050 int8_t inode_bmap(struct inode *inode, sector_t block,
2051                   struct extent_position *pos, kernel_lb_addr *eloc,
2052                   uint32_t *elen, sector_t *offset)
2053 {
2054         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2055         loff_t lbcount = 0, bcount =
2056             (loff_t) block << blocksize_bits;
2057         int8_t etype;
2058         struct udf_inode_info *iinfo;
2059
2060         if (block < 0) {
2061                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
2062                 return -1;
2063         }
2064
2065         iinfo = UDF_I(inode);
2066         pos->offset = 0;
2067         pos->block = iinfo->i_location;
2068         pos->bh = NULL;
2069         *elen = 0;
2070
2071         do {
2072                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2073                 if (etype == -1) {
2074                         *offset = (bcount - lbcount) >> blocksize_bits;
2075                         iinfo->i_lenExtents = lbcount;
2076                         return -1;
2077                 }
2078                 lbcount += *elen;
2079         } while (lbcount <= bcount);
2080
2081         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2082
2083         return etype;
2084 }
2085
2086 long udf_block_map(struct inode *inode, sector_t block)
2087 {
2088         kernel_lb_addr eloc;
2089         uint32_t elen;
2090         sector_t offset;
2091         struct extent_position epos = {};
2092         int ret;
2093
2094         lock_kernel();
2095
2096         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2097                                                 (EXT_RECORDED_ALLOCATED >> 30))
2098                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2099         else
2100                 ret = 0;
2101
2102         unlock_kernel();
2103         brelse(epos.bh);
2104
2105         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2106                 return udf_fixed_to_variable(ret);
2107         else
2108                 return ret;
2109 }