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                                         long *, 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  * udf_delete_inode
  71  *
  72  * PURPOSE
  73  *      Clean-up before the specified inode is destroyed.
  74  *
  75  * DESCRIPTION
  76  *      This routine is called when the kernel destroys an inode structure
  77  *      ie. when iput() finds i_count == 0.
  78  *
  79  * HISTORY
  80  *      July 1, 1997 - Andrew E. Mileski
  81  *      Written, tested, and released.
  82  *
  83  *  Called at the last iput() if i_nlink is zero.
  84  */
  85 void udf_delete_inode(struct inode *inode)
  86 {
  87         truncate_inode_pages(&inode->i_data, 0);
  88
  89         if (is_bad_inode(inode))
  90                 goto no_delete;
  91
  92         inode->i_size = 0;
  93         udf_truncate(inode);
  94         lock_kernel();
  95
  96         udf_update_inode(inode, IS_SYNC(inode));
  97         udf_free_inode(inode);
  98
  99         unlock_kernel();
 100         return;
 101
 102 no_delete:
 103         clear_inode(inode);
 104 }
 105
 106 /*
 107  * If we are going to release inode from memory, we discard preallocation and
 108  * truncate last inode extent to proper length. We could use drop_inode() but
 109  * it's called under inode_lock and thus we cannot mark inode dirty there.  We
 110  * use clear_inode() but we have to make sure to write inode as it's not written
 111  * automatically.
 112  */
 113 void udf_clear_inode(struct inode *inode)
 114 {
 115         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 116                 lock_kernel();
 117                 /* Discard preallocation for directories, symlinks, etc. */
 118                 udf_discard_prealloc(inode);
 119                 udf_truncate_tail_extent(inode);
 120                 unlock_kernel();
 121                 write_inode_now(inode, 1);
 122         }
 123         kfree(UDF_I_DATA(inode));
 124         UDF_I_DATA(inode) = NULL;
 125 }
 126
 127 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 128 {
 129         return block_write_full_page(page, udf_get_block, wbc);
 130 }
 131
 132 static int udf_readpage(struct file *file, struct page *page)
 133 {
 134         return block_read_full_page(page, udf_get_block);
 135 }
 136
 137 static int udf_write_begin(struct file *file, struct address_space *mapping,
 138                         loff_t pos, unsigned len, unsigned flags,
 139                         struct page **pagep, void **fsdata)
 140 {
 141         *pagep = NULL;
 142         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 143                                 udf_get_block);
 144 }
 145
 146 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 147 {
 148         return generic_block_bmap(mapping, block, udf_get_block);
 149 }
 150
 151 const struct address_space_operations udf_aops = {
 152         .readpage       = udf_readpage,
 153         .writepage      = udf_writepage,
 154         .sync_page      = block_sync_page,
 155         .write_begin            = udf_write_begin,
 156         .write_end              = generic_write_end,
 157         .bmap           = udf_bmap,
 158 };
 159
 160 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 161 {
 162         struct page *page;
 163         char *kaddr;
 164         struct writeback_control udf_wbc = {
 165                 .sync_mode = WB_SYNC_NONE,
 166                 .nr_to_write = 1,
 167         };
 168
 169         /* from now on we have normal address_space methods */
 170         inode->i_data.a_ops = &udf_aops;
 171
 172         if (!UDF_I_LENALLOC(inode)) {
 173                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 174                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 175                 else
 176                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 177                 mark_inode_dirty(inode);
 178                 return;
 179         }
 180
 181         page = grab_cache_page(inode->i_mapping, 0);
 182         BUG_ON(!PageLocked(page));
 183
 184         if (!PageUptodate(page)) {
 185                 kaddr = kmap(page);
 186                 memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
 187                        PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
 188                 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
 189                        UDF_I_LENALLOC(inode));
 190                 flush_dcache_page(page);
 191                 SetPageUptodate(page);
 192                 kunmap(page);
 193         }
 194         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
 195                UDF_I_LENALLOC(inode));
 196         UDF_I_LENALLOC(inode) = 0;
 197         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 198                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 199         else
 200                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 201
 202         inode->i_data.a_ops->writepage(page, &udf_wbc);
 203         page_cache_release(page);
 204
 205         mark_inode_dirty(inode);
 206 }
 207
 208 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 209                                            int *err)
 210 {
 211         int newblock;
 212         struct buffer_head *dbh = NULL;
 213         kernel_lb_addr eloc;
 214         uint32_t elen;
 215         uint8_t alloctype;
 216         struct extent_position epos;
 217
 218         struct udf_fileident_bh sfibh, dfibh;
 219         loff_t f_pos = udf_ext0_offset(inode) >> 2;
 220         int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
 221         struct fileIdentDesc cfi, *sfi, *dfi;
 222
 223         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 224                 alloctype = ICBTAG_FLAG_AD_SHORT;
 225         else
 226                 alloctype = ICBTAG_FLAG_AD_LONG;
 227
 228         if (!inode->i_size) {
 229                 UDF_I_ALLOCTYPE(inode) = alloctype;
 230                 mark_inode_dirty(inode);
 231                 return NULL;
 232         }
 233
 234         /* alloc block, and copy data to it */
 235         *block = udf_new_block(inode->i_sb, inode,
 236                                UDF_I_LOCATION(inode).partitionReferenceNum,
 237                                UDF_I_LOCATION(inode).logicalBlockNum, err);
 238         if (!(*block))
 239                 return NULL;
 240         newblock = udf_get_pblock(inode->i_sb, *block,
 241                                   UDF_I_LOCATION(inode).partitionReferenceNum,
 242                                   0);
 243         if (!newblock)
 244                 return NULL;
 245         dbh = udf_tgetblk(inode->i_sb, newblock);
 246         if (!dbh)
 247                 return NULL;
 248         lock_buffer(dbh);
 249         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 250         set_buffer_uptodate(dbh);
 251         unlock_buffer(dbh);
 252         mark_buffer_dirty_inode(dbh, inode);
 253
 254         sfibh.soffset = sfibh.eoffset =
 255                         (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2;
 256         sfibh.sbh = sfibh.ebh = NULL;
 257         dfibh.soffset = dfibh.eoffset = 0;
 258         dfibh.sbh = dfibh.ebh = dbh;
 259         while ((f_pos < size)) {
 260                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 261                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 262                                          NULL, NULL, NULL);
 263                 if (!sfi) {
 264                         brelse(dbh);
 265                         return NULL;
 266                 }
 267                 UDF_I_ALLOCTYPE(inode) = alloctype;
 268                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 269                 dfibh.soffset = dfibh.eoffset;
 270                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 271                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 272                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 273                                  sfi->fileIdent +
 274                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 275                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 276                         brelse(dbh);
 277                         return NULL;
 278                 }
 279         }
 280         mark_buffer_dirty_inode(dbh, inode);
 281
 282         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0,
 283                 UDF_I_LENALLOC(inode));
 284         UDF_I_LENALLOC(inode) = 0;
 285         eloc.logicalBlockNum = *block;
 286         eloc.partitionReferenceNum =
 287                                 UDF_I_LOCATION(inode).partitionReferenceNum;
 288         elen = inode->i_size;
 289         UDF_I_LENEXTENTS(inode) = elen;
 290         epos.bh = NULL;
 291         epos.block = UDF_I_LOCATION(inode);
 292         epos.offset = udf_file_entry_alloc_offset(inode);
 293         udf_add_aext(inode, &epos, eloc, elen, 0);
 294         /* UniqueID stuff */
 295
 296         brelse(epos.bh);
 297         mark_inode_dirty(inode);
 298         return dbh;
 299 }
 300
 301 static int udf_get_block(struct inode *inode, sector_t block,
 302                          struct buffer_head *bh_result, int create)
 303 {
 304         int err, new;
 305         struct buffer_head *bh;
 306         unsigned long phys;
 307
 308         if (!create) {
 309                 phys = udf_block_map(inode, block);
 310                 if (phys)
 311                         map_bh(bh_result, inode->i_sb, phys);
 312                 return 0;
 313         }
 314
 315         err = -EIO;
 316         new = 0;
 317         bh = NULL;
 318
 319         lock_kernel();
 320
 321         if (block < 0)
 322                 goto abort_negative;
 323
 324         if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1) {
 325                 UDF_I_NEXT_ALLOC_BLOCK(inode)++;
 326                 UDF_I_NEXT_ALLOC_GOAL(inode)++;
 327         }
 328
 329         err = 0;
 330
 331         bh = inode_getblk(inode, block, &err, &phys, &new);
 332         BUG_ON(bh);
 333         if (err)
 334                 goto abort;
 335         BUG_ON(!phys);
 336
 337         if (new)
 338                 set_buffer_new(bh_result);
 339         map_bh(bh_result, inode->i_sb, phys);
 340
 341 abort:
 342         unlock_kernel();
 343         return err;
 344
 345 abort_negative:
 346         udf_warning(inode->i_sb, "udf_get_block", "block < 0");
 347         goto abort;
 348 }
 349
 350 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 351                                       int create, int *err)
 352 {
 353         struct buffer_head *bh;
 354         struct buffer_head dummy;
 355
 356         dummy.b_state = 0;
 357         dummy.b_blocknr = -1000;
 358         *err = udf_get_block(inode, block, &dummy, create);
 359         if (!*err && buffer_mapped(&dummy)) {
 360                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 361                 if (buffer_new(&dummy)) {
 362                         lock_buffer(bh);
 363                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 364                         set_buffer_uptodate(bh);
 365                         unlock_buffer(bh);
 366                         mark_buffer_dirty_inode(bh, inode);
 367                 }
 368                 return bh;
 369         }
 370
 371         return NULL;
 372 }
 373
 374 /* Extend the file by 'blocks' blocks, return the number of extents added */
 375 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 376                     kernel_long_ad *last_ext, sector_t blocks)
 377 {
 378         sector_t add;
 379         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 380         struct super_block *sb = inode->i_sb;
 381         kernel_lb_addr prealloc_loc = {};
 382         int prealloc_len = 0;
 383
 384         /* The previous extent is fake and we should not extend by anything
 385          * - there's nothing to do... */
 386         if (!blocks && fake)
 387                 return 0;
 388
 389         /* Round the last extent up to a multiple of block size */
 390         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 391                 last_ext->extLength =
 392                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 393                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 394                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 395                 UDF_I_LENEXTENTS(inode) =
 396                         (UDF_I_LENEXTENTS(inode) + sb->s_blocksize - 1) &
 397                         ~(sb->s_blocksize - 1);
 398         }
 399
 400         /* Last extent are just preallocated blocks? */
 401         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 402                                                 EXT_NOT_RECORDED_ALLOCATED) {
 403                 /* Save the extent so that we can reattach it to the end */
 404                 prealloc_loc = last_ext->extLocation;
 405                 prealloc_len = last_ext->extLength;
 406                 /* Mark the extent as a hole */
 407                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 408                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 409                 last_ext->extLocation.logicalBlockNum = 0;
 410                 last_ext->extLocation.partitionReferenceNum = 0;
 411         }
 412
 413         /* Can we merge with the previous extent? */
 414         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 415                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 416                 add = ((1 << 30) - sb->s_blocksize -
 417                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 418                         sb->s_blocksize_bits;
 419                 if (add > blocks)
 420                         add = blocks;
 421                 blocks -= add;
 422                 last_ext->extLength += add << sb->s_blocksize_bits;
 423         }
 424
 425         if (fake) {
 426                 udf_add_aext(inode, last_pos, last_ext->extLocation,
 427                              last_ext->extLength, 1);
 428                 count++;
 429         } else
 430                 udf_write_aext(inode, last_pos, last_ext->extLocation,
 431                                 last_ext->extLength, 1);
 432
 433         /* Managed to do everything necessary? */
 434         if (!blocks)
 435                 goto out;
 436
 437         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 438         last_ext->extLocation.logicalBlockNum = 0;
 439         last_ext->extLocation.partitionReferenceNum = 0;
 440         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 441         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 442                                 (add << sb->s_blocksize_bits);
 443
 444         /* Create enough extents to cover the whole hole */
 445         while (blocks > add) {
 446                 blocks -= add;
 447                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 448                                  last_ext->extLength, 1) == -1)
 449                         return -1;
 450                 count++;
 451         }
 452         if (blocks) {
 453                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 454                         (blocks << sb->s_blocksize_bits);
 455                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 456                                  last_ext->extLength, 1) == -1)
 457                         return -1;
 458                 count++;
 459         }
 460
 461 out:
 462         /* Do we have some preallocated blocks saved? */
 463         if (prealloc_len) {
 464                 if (udf_add_aext(inode, last_pos, prealloc_loc,
 465                                  prealloc_len, 1) == -1)
 466                         return -1;
 467                 last_ext->extLocation = prealloc_loc;
 468                 last_ext->extLength = prealloc_len;
 469                 count++;
 470         }
 471
 472         /* last_pos should point to the last written extent... */
 473         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
 474                 last_pos->offset -= sizeof(short_ad);
 475         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
 476                 last_pos->offset -= sizeof(long_ad);
 477         else
 478                 return -1;
 479
 480         return count;
 481 }
 482
 483 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 484                                         int *err, long *phys, int *new)
 485 {
 486         static sector_t last_block;
 487         struct buffer_head *result = NULL;
 488         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 489         struct extent_position prev_epos, cur_epos, next_epos;
 490         int count = 0, startnum = 0, endnum = 0;
 491         uint32_t elen = 0, tmpelen;
 492         kernel_lb_addr eloc, tmpeloc;
 493         int c = 1;
 494         loff_t lbcount = 0, b_off = 0;
 495         uint32_t newblocknum, newblock;
 496         sector_t offset = 0;
 497         int8_t etype;
 498         int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
 499         int lastblock = 0;
 500
 501         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 502         prev_epos.block = UDF_I_LOCATION(inode);
 503         prev_epos.bh = NULL;
 504         cur_epos = next_epos = prev_epos;
 505         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 506
 507         /* find the extent which contains the block we are looking for.
 508            alternate between laarr[0] and laarr[1] for locations of the
 509            current extent, and the previous extent */
 510         do {
 511                 if (prev_epos.bh != cur_epos.bh) {
 512                         brelse(prev_epos.bh);
 513                         get_bh(cur_epos.bh);
 514                         prev_epos.bh = cur_epos.bh;
 515                 }
 516                 if (cur_epos.bh != next_epos.bh) {
 517                         brelse(cur_epos.bh);
 518                         get_bh(next_epos.bh);
 519                         cur_epos.bh = next_epos.bh;
 520                 }
 521
 522                 lbcount += elen;
 523
 524                 prev_epos.block = cur_epos.block;
 525                 cur_epos.block = next_epos.block;
 526
 527                 prev_epos.offset = cur_epos.offset;
 528                 cur_epos.offset = next_epos.offset;
 529
 530                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 531                 if (etype == -1)
 532                         break;
 533
 534                 c = !c;
 535
 536                 laarr[c].extLength = (etype << 30) | elen;
 537                 laarr[c].extLocation = eloc;
 538
 539                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 540                         pgoal = eloc.logicalBlockNum +
 541                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 542                                  inode->i_sb->s_blocksize_bits);
 543
 544                 count++;
 545         } while (lbcount + elen <= b_off);
 546
 547         b_off -= lbcount;
 548         offset = b_off >> inode->i_sb->s_blocksize_bits;
 549         /*
 550          * Move prev_epos and cur_epos into indirect extent if we are at
 551          * the pointer to it
 552          */
 553         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 554         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 555
 556         /* if the extent is allocated and recorded, return the block
 557            if the extent is not a multiple of the blocksize, round up */
 558
 559         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 560                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 561                         elen = EXT_RECORDED_ALLOCATED |
 562                                 ((elen + inode->i_sb->s_blocksize - 1) &
 563                                  ~(inode->i_sb->s_blocksize - 1));
 564                         etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
 565                 }
 566                 brelse(prev_epos.bh);
 567                 brelse(cur_epos.bh);
 568                 brelse(next_epos.bh);
 569                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 570                 *phys = newblock;
 571                 return NULL;
 572         }
 573
 574         last_block = block;
 575         /* Are we beyond EOF? */
 576         if (etype == -1) {
 577                 int ret;
 578
 579                 if (count) {
 580                         if (c)
 581                                 laarr[0] = laarr[1];
 582                         startnum = 1;
 583                 } else {
 584                         /* Create a fake extent when there's not one */
 585                         memset(&laarr[0].extLocation, 0x00,
 586                                 sizeof(kernel_lb_addr));
 587                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 588                         /* Will udf_extend_file() create real extent from
 589                            a fake one? */
 590                         startnum = (offset > 0);
 591                 }
 592                 /* Create extents for the hole between EOF and offset */
 593                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 594                 if (ret == -1) {
 595                         brelse(prev_epos.bh);
 596                         brelse(cur_epos.bh);
 597                         brelse(next_epos.bh);
 598                         /* We don't really know the error here so we just make
 599                          * something up */
 600                         *err = -ENOSPC;
 601                         return NULL;
 602                 }
 603                 c = 0;
 604                 offset = 0;
 605                 count += ret;
 606                 /* We are not covered by a preallocated extent? */
 607                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 608                                                 EXT_NOT_RECORDED_ALLOCATED) {
 609                         /* Is there any real extent? - otherwise we overwrite
 610                          * the fake one... */
 611                         if (count)
 612                                 c = !c;
 613                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 614                                 inode->i_sb->s_blocksize;
 615                         memset(&laarr[c].extLocation, 0x00,
 616                                 sizeof(kernel_lb_addr));
 617                         count++;
 618                         endnum++;
 619                 }
 620                 endnum = c + 1;
 621                 lastblock = 1;
 622         } else {
 623                 endnum = startnum = ((count > 2) ? 2 : count);
 624
 625                 /* if the current extent is in position 0,
 626                    swap it with the previous */
 627                 if (!c && count != 1) {
 628                         laarr[2] = laarr[0];
 629                         laarr[0] = laarr[1];
 630                         laarr[1] = laarr[2];
 631                         c = 1;
 632                 }
 633
 634                 /* if the current block is located in an extent,
 635                    read the next extent */
 636                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 637                 if (etype != -1) {
 638                         laarr[c + 1].extLength = (etype << 30) | elen;
 639                         laarr[c + 1].extLocation = eloc;
 640                         count++;
 641                         startnum++;
 642                         endnum++;
 643                 } else
 644                         lastblock = 1;
 645         }
 646
 647         /* if the current extent is not recorded but allocated, get the
 648          * block in the extent corresponding to the requested block */
 649         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 650                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 651         else { /* otherwise, allocate a new block */
 652                 if (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
 653                         goal = UDF_I_NEXT_ALLOC_GOAL(inode);
 654
 655                 if (!goal) {
 656                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 657                                 goal = UDF_I_LOCATION(inode).logicalBlockNum+1;
 658                 }
 659
 660                 newblocknum = udf_new_block(inode->i_sb, inode,
 661                                 UDF_I_LOCATION(inode).partitionReferenceNum,
 662                                 goal, err);
 663                 if (!newblocknum) {
 664                         brelse(prev_epos.bh);
 665                         *err = -ENOSPC;
 666                         return NULL;
 667                 }
 668                 UDF_I_LENEXTENTS(inode) += inode->i_sb->s_blocksize;
 669         }
 670
 671         /* if the extent the requsted block is located in contains multiple
 672          * blocks, split the extent into at most three extents. blocks prior
 673          * to requested block, requested block, and blocks after requested
 674          * block */
 675         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 676
 677 #ifdef UDF_PREALLOCATE
 678         /* preallocate blocks */
 679         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 680 #endif
 681
 682         /* merge any continuous blocks in laarr */
 683         udf_merge_extents(inode, laarr, &endnum);
 684
 685         /* write back the new extents, inserting new extents if the new number
 686          * of extents is greater than the old number, and deleting extents if
 687          * the new number of extents is less than the old number */
 688         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 689
 690         brelse(prev_epos.bh);
 691
 692         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 693                                 UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 694         if (!newblock)
 695                 return NULL;
 696         *phys = newblock;
 697         *err = 0;
 698         *new = 1;
 699         UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
 700         UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum;
 701         inode->i_ctime = current_fs_time(inode->i_sb);
 702
 703         if (IS_SYNC(inode))
 704                 udf_sync_inode(inode);
 705         else
 706                 mark_inode_dirty(inode);
 707
 708         return result;
 709 }
 710
 711 static void udf_split_extents(struct inode *inode, int *c, int offset,
 712                               int newblocknum,
 713                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 714                               int *endnum)
 715 {
 716         unsigned long blocksize = inode->i_sb->s_blocksize;
 717         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 718
 719         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 720             (laarr[*c].extLength >> 30) ==
 721                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 722                 int curr = *c;
 723                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 724                             blocksize - 1) >> blocksize_bits;
 725                 int8_t etype = (laarr[curr].extLength >> 30);
 726
 727                 if (blen == 1)
 728                         ;
 729                 else if (!offset || blen == offset + 1) {
 730                         laarr[curr + 2] = laarr[curr + 1];
 731                         laarr[curr + 1] = laarr[curr];
 732                 } else {
 733                         laarr[curr + 3] = laarr[curr + 1];
 734                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 735                 }
 736
 737                 if (offset) {
 738                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 739                                 udf_free_blocks(inode->i_sb, inode,
 740                                                 laarr[curr].extLocation,
 741                                                 0, offset);
 742                                 laarr[curr].extLength =
 743                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 744                                         (offset << blocksize_bits);
 745                                 laarr[curr].extLocation.logicalBlockNum = 0;
 746                                 laarr[curr].extLocation.
 747                                                 partitionReferenceNum = 0;
 748                         } else
 749                                 laarr[curr].extLength = (etype << 30) |
 750                                         (offset << blocksize_bits);
 751                         curr++;
 752                         (*c)++;
 753                         (*endnum)++;
 754                 }
 755
 756                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 757                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 758                         laarr[curr].extLocation.partitionReferenceNum =
 759                                 UDF_I_LOCATION(inode).partitionReferenceNum;
 760                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 761                         blocksize;
 762                 curr++;
 763
 764                 if (blen != offset + 1) {
 765                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 766                                 laarr[curr].extLocation.logicalBlockNum +=
 767                                                                 offset + 1;
 768                         laarr[curr].extLength = (etype << 30) |
 769                                 ((blen - (offset + 1)) << blocksize_bits);
 770                         curr++;
 771                         (*endnum)++;
 772                 }
 773         }
 774 }
 775
 776 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 777                                  kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 778                                  int *endnum)
 779 {
 780         int start, length = 0, currlength = 0, i;
 781
 782         if (*endnum >= (c + 1)) {
 783                 if (!lastblock)
 784                         return;
 785                 else
 786                         start = c;
 787         } else {
 788                 if ((laarr[c + 1].extLength >> 30) ==
 789                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 790                         start = c + 1;
 791                         length = currlength =
 792                                 (((laarr[c + 1].extLength &
 793                                         UDF_EXTENT_LENGTH_MASK) +
 794                                 inode->i_sb->s_blocksize - 1) >>
 795                                 inode->i_sb->s_blocksize_bits);
 796                 } else
 797                         start = c;
 798         }
 799
 800         for (i = start + 1; i <= *endnum; i++) {
 801                 if (i == *endnum) {
 802                         if (lastblock)
 803                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 804                 } else if ((laarr[i].extLength >> 30) ==
 805                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 806                         length += (((laarr[i].extLength &
 807                                                 UDF_EXTENT_LENGTH_MASK) +
 808                                     inode->i_sb->s_blocksize - 1) >>
 809                                     inode->i_sb->s_blocksize_bits);
 810                 } else
 811                         break;
 812         }
 813
 814         if (length) {
 815                 int next = laarr[start].extLocation.logicalBlockNum +
 816                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 817                           inode->i_sb->s_blocksize - 1) >>
 818                           inode->i_sb->s_blocksize_bits);
 819                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 820                                 laarr[start].extLocation.partitionReferenceNum,
 821                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 822                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 823                                 currlength);
 824                 if (numalloc)   {
 825                         if (start == (c + 1))
 826                                 laarr[start].extLength +=
 827                                         (numalloc <<
 828                                          inode->i_sb->s_blocksize_bits);
 829                         else {
 830                                 memmove(&laarr[c + 2], &laarr[c + 1],
 831                                         sizeof(long_ad) * (*endnum - (c + 1)));
 832                                 (*endnum)++;
 833                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 834                                 laarr[c + 1].extLocation.partitionReferenceNum =
 835                                         laarr[c].extLocation.
 836                                                         partitionReferenceNum;
 837                                 laarr[c + 1].extLength =
 838                                         EXT_NOT_RECORDED_ALLOCATED |
 839                                         (numalloc <<
 840                                          inode->i_sb->s_blocksize_bits);
 841                                 start = c + 1;
 842                         }
 843
 844                         for (i = start + 1; numalloc && i < *endnum; i++) {
 845                                 int elen = ((laarr[i].extLength &
 846                                                 UDF_EXTENT_LENGTH_MASK) +
 847                                             inode->i_sb->s_blocksize - 1) >>
 848                                             inode->i_sb->s_blocksize_bits;
 849
 850                                 if (elen > numalloc) {
 851                                         laarr[i].extLength -=
 852                                                 (numalloc <<
 853                                                  inode->i_sb->s_blocksize_bits);
 854                                         numalloc = 0;
 855                                 } else {
 856                                         numalloc -= elen;
 857                                         if (*endnum > (i + 1))
 858                                                 memmove(&laarr[i],
 859                                                         &laarr[i + 1],
 860                                                         sizeof(long_ad) *
 861                                                         (*endnum - (i + 1)));
 862                                         i--;
 863                                         (*endnum)--;
 864                                 }
 865                         }
 866                         UDF_I_LENEXTENTS(inode) +=
 867                                 numalloc << inode->i_sb->s_blocksize_bits;
 868                 }
 869         }
 870 }
 871
 872 static void udf_merge_extents(struct inode *inode,
 873                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 874                               int *endnum)
 875 {
 876         int i;
 877         unsigned long blocksize = inode->i_sb->s_blocksize;
 878         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 879
 880         for (i = 0; i < (*endnum - 1); i++) {
 881                 kernel_long_ad *li /*l[i]*/ = &laarr[i];
 882                 kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 883
 884                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 885                         (((li->extLength >> 30) ==
 886                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 887                         ((lip1->extLocation.logicalBlockNum -
 888                           li->extLocation.logicalBlockNum) ==
 889                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 890                         blocksize - 1) >> blocksize_bits)))) {
 891
 892                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 893                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 894                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 895                                 lip1->extLength = (lip1->extLength -
 896                                                   (li->extLength &
 897                                                    UDF_EXTENT_LENGTH_MASK) +
 898                                                    UDF_EXTENT_LENGTH_MASK) &
 899                                                         ~(blocksize - 1);
 900                                 li->extLength = (li->extLength &
 901                                                  UDF_EXTENT_FLAG_MASK) +
 902                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 903                                                 blocksize;
 904                                 lip1->extLocation.logicalBlockNum =
 905                                         li->extLocation.logicalBlockNum +
 906                                         ((li->extLength &
 907                                                 UDF_EXTENT_LENGTH_MASK) >>
 908                                                 blocksize_bits);
 909                         } else {
 910                                 li->extLength = lip1->extLength +
 911                                         (((li->extLength &
 912                                                 UDF_EXTENT_LENGTH_MASK) +
 913                                          blocksize - 1) & ~(blocksize - 1));
 914                                 if (*endnum > (i + 2))
 915                                         memmove(&laarr[i + 1], &laarr[i + 2],
 916                                                 sizeof(long_ad) *
 917                                                 (*endnum - (i + 2)));
 918                                 i--;
 919                                 (*endnum)--;
 920                         }
 921                 } else if (((li->extLength >> 30) ==
 922                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 923                            ((lip1->extLength >> 30) ==
 924                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 925                         udf_free_blocks(inode->i_sb, inode, li->extLocation, 0,
 926                                         ((li->extLength &
 927                                           UDF_EXTENT_LENGTH_MASK) +
 928                                          blocksize - 1) >> blocksize_bits);
 929                         li->extLocation.logicalBlockNum = 0;
 930                         li->extLocation.partitionReferenceNum = 0;
 931
 932                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 933                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 934                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 935                                 lip1->extLength = (lip1->extLength -
 936                                                    (li->extLength &
 937                                                    UDF_EXTENT_LENGTH_MASK) +
 938                                                    UDF_EXTENT_LENGTH_MASK) &
 939                                                    ~(blocksize - 1);
 940                                 li->extLength = (li->extLength &
 941                                                  UDF_EXTENT_FLAG_MASK) +
 942                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 943                                                 blocksize;
 944                         } else {
 945                                 li->extLength = lip1->extLength +
 946                                         (((li->extLength &
 947                                                 UDF_EXTENT_LENGTH_MASK) +
 948                                           blocksize - 1) & ~(blocksize - 1));
 949                                 if (*endnum > (i + 2))
 950                                         memmove(&laarr[i + 1], &laarr[i + 2],
 951                                                 sizeof(long_ad) *
 952                                                 (*endnum - (i + 2)));
 953                                 i--;
 954                                 (*endnum)--;
 955                         }
 956                 } else if ((li->extLength >> 30) ==
 957                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 958                         udf_free_blocks(inode->i_sb, inode,
 959                                         li->extLocation, 0,
 960                                         ((li->extLength &
 961                                                 UDF_EXTENT_LENGTH_MASK) +
 962                                          blocksize - 1) >> blocksize_bits);
 963                         li->extLocation.logicalBlockNum = 0;
 964                         li->extLocation.partitionReferenceNum = 0;
 965                         li->extLength = (li->extLength &
 966                                                 UDF_EXTENT_LENGTH_MASK) |
 967                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 968                 }
 969         }
 970 }
 971
 972 static void udf_update_extents(struct inode *inode,
 973                                kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 974                                int startnum, int endnum,
 975                                struct extent_position *epos)
 976 {
 977         int start = 0, i;
 978         kernel_lb_addr tmploc;
 979         uint32_t tmplen;
 980
 981         if (startnum > endnum) {
 982                 for (i = 0; i < (startnum - endnum); i++)
 983                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 984                                         laarr[i].extLength);
 985         } else if (startnum < endnum) {
 986                 for (i = 0; i < (endnum - startnum); i++) {
 987                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 988                                         laarr[i].extLength);
 989                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 990                                       &laarr[i].extLength, 1);
 991                         start++;
 992                 }
 993         }
 994
 995         for (i = start; i < endnum; i++) {
 996                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 997                 udf_write_aext(inode, epos, laarr[i].extLocation,
 998                                laarr[i].extLength, 1);
 999         }
1000 }
1001
1002 struct buffer_head *udf_bread(struct inode *inode, int block,
1003                               int create, int *err)
1004 {
1005         struct buffer_head *bh = NULL;
1006
1007         bh = udf_getblk(inode, block, create, err);
1008         if (!bh)
1009                 return NULL;
1010
1011         if (buffer_uptodate(bh))
1012                 return bh;
1013
1014         ll_rw_block(READ, 1, &bh);
1015
1016         wait_on_buffer(bh);
1017         if (buffer_uptodate(bh))
1018                 return bh;
1019
1020         brelse(bh);
1021         *err = -EIO;
1022         return NULL;
1023 }
1024
1025 void udf_truncate(struct inode *inode)
1026 {
1027         int offset;
1028         int err;
1029
1030         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1031               S_ISLNK(inode->i_mode)))
1032                 return;
1033         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1034                 return;
1035
1036         lock_kernel();
1037         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
1038                 if (inode->i_sb->s_blocksize <
1039                                 (udf_file_entry_alloc_offset(inode) +
1040                                  inode->i_size)) {
1041                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1042                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
1043                                 inode->i_size = UDF_I_LENALLOC(inode);
1044                                 unlock_kernel();
1045                                 return;
1046                         } else
1047                                 udf_truncate_extents(inode);
1048                 } else {
1049                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1050                         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) +
1051                                 offset, 0x00, inode->i_sb->s_blocksize -
1052                                 offset - udf_file_entry_alloc_offset(inode));
1053                         UDF_I_LENALLOC(inode) = inode->i_size;
1054                 }
1055         } else {
1056                 block_truncate_page(inode->i_mapping, inode->i_size,
1057                                     udf_get_block);
1058                 udf_truncate_extents(inode);
1059         }
1060
1061         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1062         if (IS_SYNC(inode))
1063                 udf_sync_inode(inode);
1064         else
1065                 mark_inode_dirty(inode);
1066         unlock_kernel();
1067 }
1068
1069 static void __udf_read_inode(struct inode *inode)
1070 {
1071         struct buffer_head *bh = NULL;
1072         struct fileEntry *fe;
1073         uint16_t ident;
1074
1075         /*
1076          * Set defaults, but the inode is still incomplete!
1077          * Note: get_new_inode() sets the following on a new inode:
1078          *      i_sb = sb
1079          *      i_no = ino
1080          *      i_flags = sb->s_flags
1081          *      i_state = 0
1082          * clean_inode(): zero fills and sets
1083          *      i_count = 1
1084          *      i_nlink = 1
1085          *      i_op = NULL;
1086          */
1087         bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
1088         if (!bh) {
1089                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1090                        inode->i_ino);
1091                 make_bad_inode(inode);
1092                 return;
1093         }
1094
1095         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1096             ident != TAG_IDENT_USE) {
1097                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1098                                 "failed ident=%d\n", inode->i_ino, ident);
1099                 brelse(bh);
1100                 make_bad_inode(inode);
1101                 return;
1102         }
1103
1104         fe = (struct fileEntry *)bh->b_data;
1105
1106         if (le16_to_cpu(fe->icbTag.strategyType) == 4096) {
1107                 struct buffer_head *ibh = NULL, *nbh = NULL;
1108                 struct indirectEntry *ie;
1109
1110                 ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1,
1111                                         &ident);
1112                 if (ident == TAG_IDENT_IE) {
1113                         if (ibh) {
1114                                 kernel_lb_addr loc;
1115                                 ie = (struct indirectEntry *)ibh->b_data;
1116
1117                                 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1118
1119                                 if (ie->indirectICB.extLength &&
1120                                     (nbh = udf_read_ptagged(inode->i_sb, loc, 0,
1121                                                             &ident))) {
1122                                         if (ident == TAG_IDENT_FE ||
1123                                             ident == TAG_IDENT_EFE) {
1124                                                 memcpy(&UDF_I_LOCATION(inode),
1125                                                        &loc,
1126                                                        sizeof(kernel_lb_addr));
1127                                                 brelse(bh);
1128                                                 brelse(ibh);
1129                                                 brelse(nbh);
1130                                                 __udf_read_inode(inode);
1131                                                 return;
1132                                         } else {
1133                                                 brelse(nbh);
1134                                                 brelse(ibh);
1135                                         }
1136                                 } else {
1137                                         brelse(ibh);
1138                                 }
1139                         }
1140                 } else {
1141                         brelse(ibh);
1142                 }
1143         } else if (le16_to_cpu(fe->icbTag.strategyType) != 4) {
1144                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1145                        le16_to_cpu(fe->icbTag.strategyType));
1146                 brelse(bh);
1147                 make_bad_inode(inode);
1148                 return;
1149         }
1150         udf_fill_inode(inode, bh);
1151
1152         brelse(bh);
1153 }
1154
1155 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1156 {
1157         struct fileEntry *fe;
1158         struct extendedFileEntry *efe;
1159         time_t convtime;
1160         long convtime_usec;
1161         int offset;
1162         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1163
1164         fe = (struct fileEntry *)bh->b_data;
1165         efe = (struct extendedFileEntry *)bh->b_data;
1166
1167         if (le16_to_cpu(fe->icbTag.strategyType) == 4)
1168                 UDF_I_STRAT4096(inode) = 0;
1169         else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
1170                 UDF_I_STRAT4096(inode) = 1;
1171
1172         UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) &
1173                                                         ICBTAG_FLAG_AD_MASK;
1174         UDF_I_UNIQUE(inode) = 0;
1175         UDF_I_LENEATTR(inode) = 0;
1176         UDF_I_LENEXTENTS(inode) = 0;
1177         UDF_I_LENALLOC(inode) = 0;
1178         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
1179         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
1180         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE) {
1181                 UDF_I_EFE(inode) = 1;
1182                 UDF_I_USE(inode) = 0;
1183                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1184                                         sizeof(struct extendedFileEntry))) {
1185                         make_bad_inode(inode);
1186                         return;
1187                 }
1188                 memcpy(UDF_I_DATA(inode),
1189                        bh->b_data + sizeof(struct extendedFileEntry),
1190                        inode->i_sb->s_blocksize -
1191                                         sizeof(struct extendedFileEntry));
1192         } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE) {
1193                 UDF_I_EFE(inode) = 0;
1194                 UDF_I_USE(inode) = 0;
1195                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1196                                                 sizeof(struct fileEntry))) {
1197                         make_bad_inode(inode);
1198                         return;
1199                 }
1200                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry),
1201                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1202         } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) {
1203                 UDF_I_EFE(inode) = 0;
1204                 UDF_I_USE(inode) = 1;
1205                 UDF_I_LENALLOC(inode) = le32_to_cpu(
1206                                 ((struct unallocSpaceEntry *)bh->b_data)->
1207                                  lengthAllocDescs);
1208                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1209                                         sizeof(struct unallocSpaceEntry))) {
1210                         make_bad_inode(inode);
1211                         return;
1212                 }
1213                 memcpy(UDF_I_DATA(inode),
1214                        bh->b_data + sizeof(struct unallocSpaceEntry),
1215                        inode->i_sb->s_blocksize -
1216                                         sizeof(struct unallocSpaceEntry));
1217                 return;
1218         }
1219
1220         inode->i_uid = le32_to_cpu(fe->uid);
1221         if (inode->i_uid == -1 ||
1222             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1223             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1224                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1225
1226         inode->i_gid = le32_to_cpu(fe->gid);
1227         if (inode->i_gid == -1 ||
1228             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1229             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1230                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1231
1232         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1233         if (!inode->i_nlink)
1234                 inode->i_nlink = 1;
1235
1236         inode->i_size = le64_to_cpu(fe->informationLength);
1237         UDF_I_LENEXTENTS(inode) = inode->i_size;
1238
1239         inode->i_mode = udf_convert_permissions(fe);
1240         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1241
1242         if (UDF_I_EFE(inode) == 0) {
1243                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1244                         (inode->i_sb->s_blocksize_bits - 9);
1245
1246                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1247                                       lets_to_cpu(fe->accessTime))) {
1248                         inode->i_atime.tv_sec = convtime;
1249                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1250                 } else {
1251                         inode->i_atime = sbi->s_record_time;
1252                 }
1253
1254                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1255                                       lets_to_cpu(fe->modificationTime))) {
1256                         inode->i_mtime.tv_sec = convtime;
1257                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1258                 } else {
1259                         inode->i_mtime = sbi->s_record_time;
1260                 }
1261
1262                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1263                                       lets_to_cpu(fe->attrTime))) {
1264                         inode->i_ctime.tv_sec = convtime;
1265                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1266                 } else {
1267                         inode->i_ctime = sbi->s_record_time;
1268                 }
1269
1270                 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
1271                 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
1272                 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
1273                 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
1274         } else {
1275                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1276                     (inode->i_sb->s_blocksize_bits - 9);
1277
1278                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1279                                       lets_to_cpu(efe->accessTime))) {
1280                         inode->i_atime.tv_sec = convtime;
1281                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1282                 } else {
1283                         inode->i_atime = sbi->s_record_time;
1284                 }
1285
1286                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1287                                       lets_to_cpu(efe->modificationTime))) {
1288                         inode->i_mtime.tv_sec = convtime;
1289                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1290                 } else {
1291                         inode->i_mtime = sbi->s_record_time;
1292                 }
1293
1294                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1295                                       lets_to_cpu(efe->createTime))) {
1296                         UDF_I_CRTIME(inode).tv_sec = convtime;
1297                         UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
1298                 } else {
1299                         UDF_I_CRTIME(inode) = sbi->s_record_time;
1300                 }
1301
1302                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1303                                       lets_to_cpu(efe->attrTime))) {
1304                         inode->i_ctime.tv_sec = convtime;
1305                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1306                 } else {
1307                         inode->i_ctime = sbi->s_record_time;
1308                 }
1309
1310                 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
1311                 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
1312                 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
1313                 offset = sizeof(struct extendedFileEntry) +
1314                                                         UDF_I_LENEATTR(inode);
1315         }
1316
1317         switch (fe->icbTag.fileType) {
1318         case ICBTAG_FILE_TYPE_DIRECTORY:
1319                 inode->i_op = &udf_dir_inode_operations;
1320                 inode->i_fop = &udf_dir_operations;
1321                 inode->i_mode |= S_IFDIR;
1322                 inc_nlink(inode);
1323                 break;
1324         case ICBTAG_FILE_TYPE_REALTIME:
1325         case ICBTAG_FILE_TYPE_REGULAR:
1326         case ICBTAG_FILE_TYPE_UNDEF:
1327                 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1328                         inode->i_data.a_ops = &udf_adinicb_aops;
1329                 else
1330                         inode->i_data.a_ops = &udf_aops;
1331                 inode->i_op = &udf_file_inode_operations;
1332                 inode->i_fop = &udf_file_operations;
1333                 inode->i_mode |= S_IFREG;
1334                 break;
1335         case ICBTAG_FILE_TYPE_BLOCK:
1336                 inode->i_mode |= S_IFBLK;
1337                 break;
1338         case ICBTAG_FILE_TYPE_CHAR:
1339                 inode->i_mode |= S_IFCHR;
1340                 break;
1341         case ICBTAG_FILE_TYPE_FIFO:
1342                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1343                 break;
1344         case ICBTAG_FILE_TYPE_SOCKET:
1345                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1346                 break;
1347         case ICBTAG_FILE_TYPE_SYMLINK:
1348                 inode->i_data.a_ops = &udf_symlink_aops;
1349                 inode->i_op = &page_symlink_inode_operations;
1350                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1351                 break;
1352         default:
1353                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1354                                 "file type=%d\n", inode->i_ino,
1355                                 fe->icbTag.fileType);
1356                 make_bad_inode(inode);
1357                 return;
1358         }
1359         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1360                 struct deviceSpec *dsea =
1361                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1362                 if (dsea) {
1363                         init_special_inode(inode, inode->i_mode,
1364                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1365                                       le32_to_cpu(dsea->minorDeviceIdent)));
1366                         /* Developer ID ??? */
1367                 } else
1368                         make_bad_inode(inode);
1369         }
1370 }
1371
1372 static int udf_alloc_i_data(struct inode *inode, size_t size)
1373 {
1374         UDF_I_DATA(inode) = kmalloc(size, GFP_KERNEL);
1375
1376         if (!UDF_I_DATA(inode)) {
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 /*
1405  * udf_write_inode
1406  *
1407  * PURPOSE
1408  *      Write out the specified inode.
1409  *
1410  * DESCRIPTION
1411  *      This routine is called whenever an inode is synced.
1412  *      Currently this routine is just a placeholder.
1413  *
1414  * HISTORY
1415  *      July 1, 1997 - Andrew E. Mileski
1416  *      Written, tested, and released.
1417  */
1418
1419 int udf_write_inode(struct inode *inode, int sync)
1420 {
1421         int ret;
1422
1423         lock_kernel();
1424         ret = udf_update_inode(inode, sync);
1425         unlock_kernel();
1426
1427         return ret;
1428 }
1429
1430 int udf_sync_inode(struct inode *inode)
1431 {
1432         return udf_update_inode(inode, 1);
1433 }
1434
1435 static int udf_update_inode(struct inode *inode, int do_sync)
1436 {
1437         struct buffer_head *bh = NULL;
1438         struct fileEntry *fe;
1439         struct extendedFileEntry *efe;
1440         uint32_t udfperms;
1441         uint16_t icbflags;
1442         uint16_t crclen;
1443         int i;
1444         kernel_timestamp cpu_time;
1445         int err = 0;
1446         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1447         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1448
1449         bh = udf_tread(inode->i_sb,
1450                         udf_get_lb_pblock(inode->i_sb,
1451                                           UDF_I_LOCATION(inode), 0));
1452         if (!bh) {
1453                 udf_debug("bread failure\n");
1454                 return -EIO;
1455         }
1456
1457         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1458
1459         fe = (struct fileEntry *)bh->b_data;
1460         efe = (struct extendedFileEntry *)bh->b_data;
1461
1462         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) {
1463                 struct unallocSpaceEntry *use =
1464                         (struct unallocSpaceEntry *)bh->b_data;
1465
1466                 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1467                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1468                        UDF_I_DATA(inode), inode->i_sb->s_blocksize -
1469                                         sizeof(struct unallocSpaceEntry));
1470                 crclen = sizeof(struct unallocSpaceEntry) +
1471                                 UDF_I_LENALLOC(inode) - sizeof(tag);
1472                 use->descTag.tagLocation = cpu_to_le32(
1473                                                 UDF_I_LOCATION(inode).
1474                                                         logicalBlockNum);
1475                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1476                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use +
1477                                                            sizeof(tag), crclen,
1478                                                            0));
1479
1480                 use->descTag.tagChecksum = 0;
1481                 for (i = 0; i < 16; i++)
1482                         if (i != 4)
1483                                 use->descTag.tagChecksum +=
1484                                                 ((uint8_t *)&(use->descTag))[i];
1485
1486                 mark_buffer_dirty(bh);
1487                 brelse(bh);
1488                 return err;
1489         }
1490
1491         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1492                 fe->uid = cpu_to_le32(-1);
1493         else
1494                 fe->uid = cpu_to_le32(inode->i_uid);
1495
1496         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1497                 fe->gid = cpu_to_le32(-1);
1498         else
1499                 fe->gid = cpu_to_le32(inode->i_gid);
1500
1501         udfperms = ((inode->i_mode & S_IRWXO)) |
1502                    ((inode->i_mode & S_IRWXG) << 2) |
1503                    ((inode->i_mode & S_IRWXU) << 4);
1504
1505         udfperms |= (le32_to_cpu(fe->permissions) &
1506                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1507                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1508                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1509         fe->permissions = cpu_to_le32(udfperms);
1510
1511         if (S_ISDIR(inode->i_mode))
1512                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1513         else
1514                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1515
1516         fe->informationLength = cpu_to_le64(inode->i_size);
1517
1518         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1519                 regid *eid;
1520                 struct deviceSpec *dsea =
1521                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1522                 if (!dsea) {
1523                         dsea = (struct deviceSpec *)
1524                                 udf_add_extendedattr(inode,
1525                                                      sizeof(struct deviceSpec) +
1526                                                      sizeof(regid), 12, 0x3);
1527                         dsea->attrType = cpu_to_le32(12);
1528                         dsea->attrSubtype = 1;
1529                         dsea->attrLength = cpu_to_le32(
1530                                                 sizeof(struct deviceSpec) +
1531                                                 sizeof(regid));
1532                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1533                 }
1534                 eid = (regid *)dsea->impUse;
1535                 memset(eid, 0, sizeof(regid));
1536                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1537                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1538                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1539                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1540                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1541         }
1542
1543         if (UDF_I_EFE(inode) == 0) {
1544                 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode),
1545                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1546                 fe->logicalBlocksRecorded = cpu_to_le64(
1547                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1548                         (blocksize_bits - 9));
1549
1550                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1551                         fe->accessTime = cpu_to_lets(cpu_time);
1552                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1553                         fe->modificationTime = cpu_to_lets(cpu_time);
1554                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1555                         fe->attrTime = cpu_to_lets(cpu_time);
1556                 memset(&(fe->impIdent), 0, sizeof(regid));
1557                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1558                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1559                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1560                 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1561                 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1562                 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1563                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1564                 crclen = sizeof(struct fileEntry);
1565         } else {
1566                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1567                        UDF_I_DATA(inode),
1568                        inode->i_sb->s_blocksize -
1569                                         sizeof(struct extendedFileEntry));
1570                 efe->objectSize = cpu_to_le64(inode->i_size);
1571                 efe->logicalBlocksRecorded = cpu_to_le64(
1572                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1573                         (blocksize_bits - 9));
1574
1575                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
1576                     (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
1577                      UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec))
1578                         UDF_I_CRTIME(inode) = inode->i_atime;
1579
1580                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
1581                     (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
1582                      UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec))
1583                         UDF_I_CRTIME(inode) = inode->i_mtime;
1584
1585                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
1586                     (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
1587                      UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec))
1588                         UDF_I_CRTIME(inode) = inode->i_ctime;
1589
1590                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1591                         efe->accessTime = cpu_to_lets(cpu_time);
1592                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1593                         efe->modificationTime = cpu_to_lets(cpu_time);
1594                 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
1595                         efe->createTime = cpu_to_lets(cpu_time);
1596                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1597                         efe->attrTime = cpu_to_lets(cpu_time);
1598
1599                 memset(&(efe->impIdent), 0, sizeof(regid));
1600                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1601                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1602                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1603                 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1604                 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1605                 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1606                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1607                 crclen = sizeof(struct extendedFileEntry);
1608         }
1609         if (UDF_I_STRAT4096(inode)) {
1610                 fe->icbTag.strategyType = cpu_to_le16(4096);
1611                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1612                 fe->icbTag.numEntries = cpu_to_le16(2);
1613         } else {
1614                 fe->icbTag.strategyType = cpu_to_le16(4);
1615                 fe->icbTag.numEntries = cpu_to_le16(1);
1616         }
1617
1618         if (S_ISDIR(inode->i_mode))
1619                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1620         else if (S_ISREG(inode->i_mode))
1621                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1622         else if (S_ISLNK(inode->i_mode))
1623                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1624         else if (S_ISBLK(inode->i_mode))
1625                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1626         else if (S_ISCHR(inode->i_mode))
1627                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1628         else if (S_ISFIFO(inode->i_mode))
1629                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1630         else if (S_ISSOCK(inode->i_mode))
1631                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1632
1633         icbflags =      UDF_I_ALLOCTYPE(inode) |
1634                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1635                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1636                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1637                         (le16_to_cpu(fe->icbTag.flags) &
1638                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1639                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1640
1641         fe->icbTag.flags = cpu_to_le16(icbflags);
1642         if (sbi->s_udfrev >= 0x0200)
1643                 fe->descTag.descVersion = cpu_to_le16(3);
1644         else
1645                 fe->descTag.descVersion = cpu_to_le16(2);
1646         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1647         fe->descTag.tagLocation = cpu_to_le32(
1648                                         UDF_I_LOCATION(inode).logicalBlockNum);
1649         crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
1650         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1651         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag),
1652                                                   crclen, 0));
1653
1654         fe->descTag.tagChecksum = 0;
1655         for (i = 0; i < 16; i++)
1656                 if (i != 4)
1657                         fe->descTag.tagChecksum +=
1658                                 ((uint8_t *)&(fe->descTag))[i];
1659
1660         /* write the data blocks */
1661         mark_buffer_dirty(bh);
1662         if (do_sync) {
1663                 sync_dirty_buffer(bh);
1664                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1665                         printk(KERN_WARNING "IO error syncing udf inode "
1666                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1667                                 inode->i_ino);
1668                         err = -EIO;
1669                 }
1670         }
1671         brelse(bh);
1672
1673         return err;
1674 }
1675
1676 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1677 {
1678         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1679         struct inode *inode = iget_locked(sb, block);
1680
1681         if (!inode)
1682                 return NULL;
1683
1684         if (inode->i_state & I_NEW) {
1685                 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
1686                 __udf_read_inode(inode);
1687                 unlock_new_inode(inode);
1688         }
1689
1690         if (is_bad_inode(inode))
1691                 goto out_iput;
1692
1693         if (ino.logicalBlockNum >= UDF_SB(sb)->
1694                         s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1695                 udf_debug("block=%d, partition=%d out of range\n",
1696                           ino.logicalBlockNum, ino.partitionReferenceNum);
1697                 make_bad_inode(inode);
1698                 goto out_iput;
1699         }
1700
1701         return inode;
1702
1703  out_iput:
1704         iput(inode);
1705         return NULL;
1706 }
1707
1708 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1709                     kernel_lb_addr eloc, uint32_t elen, int inc)
1710 {
1711         int adsize;
1712         short_ad *sad = NULL;
1713         long_ad *lad = NULL;
1714         struct allocExtDesc *aed;
1715         int8_t etype;
1716         uint8_t *ptr;
1717
1718         if (!epos->bh)
1719                 ptr = UDF_I_DATA(inode) + epos->offset -
1720                         udf_file_entry_alloc_offset(inode) +
1721                         UDF_I_LENEATTR(inode);
1722         else
1723                 ptr = epos->bh->b_data + epos->offset;
1724
1725         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1726                 adsize = sizeof(short_ad);
1727         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1728                 adsize = sizeof(long_ad);
1729         else
1730                 return -1;
1731
1732         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1733                 char *sptr, *dptr;
1734                 struct buffer_head *nbh;
1735                 int err, loffset;
1736                 kernel_lb_addr obloc = epos->block;
1737
1738                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1739                                                 obloc.partitionReferenceNum,
1740                                                 obloc.logicalBlockNum, &err);
1741                 if (!epos->block.logicalBlockNum)
1742                         return -1;
1743                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1744                                                                  epos->block,
1745                                                                  0));
1746                 if (!nbh)
1747                         return -1;
1748                 lock_buffer(nbh);
1749                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1750                 set_buffer_uptodate(nbh);
1751                 unlock_buffer(nbh);
1752                 mark_buffer_dirty_inode(nbh, inode);
1753
1754                 aed = (struct allocExtDesc *)(nbh->b_data);
1755                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1756                         aed->previousAllocExtLocation =
1757                                         cpu_to_le32(obloc.logicalBlockNum);
1758                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1759                         loffset = epos->offset;
1760                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1761                         sptr = ptr - adsize;
1762                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1763                         memcpy(dptr, sptr, adsize);
1764                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1765                 } else {
1766                         loffset = epos->offset + adsize;
1767                         aed->lengthAllocDescs = cpu_to_le32(0);
1768                         sptr = ptr;
1769                         epos->offset = sizeof(struct allocExtDesc);
1770
1771                         if (epos->bh) {
1772                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1773                                 aed->lengthAllocDescs =
1774                                         cpu_to_le32(le32_to_cpu(
1775                                         aed->lengthAllocDescs) + adsize);
1776                         } else {
1777                                 UDF_I_LENALLOC(inode) += adsize;
1778                                 mark_inode_dirty(inode);
1779                         }
1780                 }
1781                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1782                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1783                                     epos->block.logicalBlockNum, sizeof(tag));
1784                 else
1785                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1786                                     epos->block.logicalBlockNum, sizeof(tag));
1787                 switch (UDF_I_ALLOCTYPE(inode)) {
1788                 case ICBTAG_FLAG_AD_SHORT:
1789                         sad = (short_ad *)sptr;
1790                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1791                                                      inode->i_sb->s_blocksize);
1792                         sad->extPosition =
1793                                 cpu_to_le32(epos->block.logicalBlockNum);
1794                         break;
1795                 case ICBTAG_FLAG_AD_LONG:
1796                         lad = (long_ad *)sptr;
1797                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1798                                                      inode->i_sb->s_blocksize);
1799                         lad->extLocation = cpu_to_lelb(epos->block);
1800                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1801                         break;
1802                 }
1803                 if (epos->bh) {
1804                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1805                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1806                                 udf_update_tag(epos->bh->b_data, loffset);
1807                         else
1808                                 udf_update_tag(epos->bh->b_data,
1809                                                 sizeof(struct allocExtDesc));
1810                         mark_buffer_dirty_inode(epos->bh, inode);
1811                         brelse(epos->bh);
1812                 } else {
1813                         mark_inode_dirty(inode);
1814                 }
1815                 epos->bh = nbh;
1816         }
1817
1818         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1819
1820         if (!epos->bh) {
1821                 UDF_I_LENALLOC(inode) += adsize;
1822                 mark_inode_dirty(inode);
1823         } else {
1824                 aed = (struct allocExtDesc *)epos->bh->b_data;
1825                 aed->lengthAllocDescs =
1826                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) +
1827                                     adsize);
1828                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1829                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1830                         udf_update_tag(epos->bh->b_data,
1831                                         epos->offset + (inc ? 0 : adsize));
1832                 else
1833                         udf_update_tag(epos->bh->b_data,
1834                                         sizeof(struct allocExtDesc));
1835                 mark_buffer_dirty_inode(epos->bh, inode);
1836         }
1837
1838         return etype;
1839 }
1840
1841 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1842                       kernel_lb_addr eloc, uint32_t elen, int inc)
1843 {
1844         int adsize;
1845         uint8_t *ptr;
1846         short_ad *sad;
1847         long_ad *lad;
1848
1849         if (!epos->bh)
1850                 ptr = UDF_I_DATA(inode) + epos->offset -
1851                         udf_file_entry_alloc_offset(inode) +
1852                         UDF_I_LENEATTR(inode);
1853         else
1854                 ptr = epos->bh->b_data + epos->offset;
1855
1856         switch (UDF_I_ALLOCTYPE(inode)) {
1857         case ICBTAG_FLAG_AD_SHORT:
1858                 sad = (short_ad *)ptr;
1859                 sad->extLength = cpu_to_le32(elen);
1860                 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1861                 adsize = sizeof(short_ad);
1862                 break;
1863         case ICBTAG_FLAG_AD_LONG:
1864                 lad = (long_ad *)ptr;
1865                 lad->extLength = cpu_to_le32(elen);
1866                 lad->extLocation = cpu_to_lelb(eloc);
1867                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1868                 adsize = sizeof(long_ad);
1869                 break;
1870         default:
1871                 return -1;
1872         }
1873
1874         if (epos->bh) {
1875                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1876                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1877                         struct allocExtDesc *aed =
1878                                 (struct allocExtDesc *)epos->bh->b_data;
1879                         udf_update_tag(epos->bh->b_data,
1880                                        le32_to_cpu(aed->lengthAllocDescs) +
1881                                        sizeof(struct allocExtDesc));
1882                 }
1883                 mark_buffer_dirty_inode(epos->bh, inode);
1884         } else {
1885                 mark_inode_dirty(inode);
1886         }
1887
1888         if (inc)
1889                 epos->offset += adsize;
1890
1891         return (elen >> 30);
1892 }
1893
1894 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1895                      kernel_lb_addr *eloc, uint32_t *elen, int inc)
1896 {
1897         int8_t etype;
1898
1899         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1900                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1901                 int block;
1902                 epos->block = *eloc;
1903                 epos->offset = sizeof(struct allocExtDesc);
1904                 brelse(epos->bh);
1905                 block = udf_get_lb_pblock(inode->i_sb, epos->block, 0);
1906                 epos->bh = udf_tread(inode->i_sb, block);
1907                 if (!epos->bh) {
1908                         udf_debug("reading block %d failed!\n", block);
1909                         return -1;
1910                 }
1911         }
1912
1913         return etype;
1914 }
1915
1916 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1917                         kernel_lb_addr *eloc, uint32_t *elen, int inc)
1918 {
1919         int alen;
1920         int8_t etype;
1921         uint8_t *ptr;
1922         short_ad *sad;
1923         long_ad *lad;
1924
1925         if (!epos->bh) {
1926                 if (!epos->offset)
1927                         epos->offset = udf_file_entry_alloc_offset(inode);
1928                 ptr = UDF_I_DATA(inode) + epos->offset -
1929                         udf_file_entry_alloc_offset(inode) +
1930                         UDF_I_LENEATTR(inode);
1931                 alen = udf_file_entry_alloc_offset(inode) +
1932                                                         UDF_I_LENALLOC(inode);
1933         } else {
1934                 if (!epos->offset)
1935                         epos->offset = sizeof(struct allocExtDesc);
1936                 ptr = epos->bh->b_data + epos->offset;
1937                 alen = sizeof(struct allocExtDesc) +
1938                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1939                                                         lengthAllocDescs);
1940         }
1941
1942         switch (UDF_I_ALLOCTYPE(inode)) {
1943         case ICBTAG_FLAG_AD_SHORT:
1944                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1945                 if (!sad)
1946                         return -1;
1947                 etype = le32_to_cpu(sad->extLength) >> 30;
1948                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1949                 eloc->partitionReferenceNum =
1950                                 UDF_I_LOCATION(inode).partitionReferenceNum;
1951                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1952                 break;
1953         case ICBTAG_FLAG_AD_LONG:
1954                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1955                 if (!lad)
1956                         return -1;
1957                 etype = le32_to_cpu(lad->extLength) >> 30;
1958                 *eloc = lelb_to_cpu(lad->extLocation);
1959                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1960                 break;
1961         default:
1962                 udf_debug("alloc_type = %d unsupported\n",
1963                                 UDF_I_ALLOCTYPE(inode));
1964                 return -1;
1965         }
1966
1967         return etype;
1968 }
1969
1970 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1971                               kernel_lb_addr neloc, uint32_t nelen)
1972 {
1973         kernel_lb_addr oeloc;
1974         uint32_t oelen;
1975         int8_t etype;
1976
1977         if (epos.bh)
1978                 get_bh(epos.bh);
1979
1980         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1981                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1982                 neloc = oeloc;
1983                 nelen = (etype << 30) | oelen;
1984         }
1985         udf_add_aext(inode, &epos, neloc, nelen, 1);
1986         brelse(epos.bh);
1987
1988         return (nelen >> 30);
1989 }
1990
1991 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1992                        kernel_lb_addr eloc, uint32_t elen)
1993 {
1994         struct extent_position oepos;
1995         int adsize;
1996         int8_t etype;
1997         struct allocExtDesc *aed;
1998
1999         if (epos.bh) {
2000                 get_bh(epos.bh);
2001                 get_bh(epos.bh);
2002         }
2003
2004         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
2005                 adsize = sizeof(short_ad);
2006         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
2007                 adsize = sizeof(long_ad);
2008         else
2009                 adsize = 0;
2010
2011         oepos = epos;
2012         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2013                 return -1;
2014
2015         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2016                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
2017                 if (oepos.bh != epos.bh) {
2018                         oepos.block = epos.block;
2019                         brelse(oepos.bh);
2020                         get_bh(epos.bh);
2021                         oepos.bh = epos.bh;
2022                         oepos.offset = epos.offset - adsize;
2023                 }
2024         }
2025         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
2026         elen = 0;
2027
2028         if (epos.bh != oepos.bh) {
2029                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
2030                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2031                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2032                 if (!oepos.bh) {
2033                         UDF_I_LENALLOC(inode) -= (adsize * 2);
2034                         mark_inode_dirty(inode);
2035                 } else {
2036                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2037                         aed->lengthAllocDescs =
2038                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) -
2039                                             (2 * adsize));
2040                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2041                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2042                                 udf_update_tag(oepos.bh->b_data,
2043                                                 oepos.offset - (2 * adsize));
2044                         else
2045                                 udf_update_tag(oepos.bh->b_data,
2046                                                 sizeof(struct allocExtDesc));
2047                         mark_buffer_dirty_inode(oepos.bh, inode);
2048                 }
2049         } else {
2050                 udf_write_aext(inode, &oepos, eloc, elen, 1);
2051                 if (!oepos.bh) {
2052                         UDF_I_LENALLOC(inode) -= adsize;
2053                         mark_inode_dirty(inode);
2054                 } else {
2055                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2056                         aed->lengthAllocDescs =
2057                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) -
2058                                             adsize);
2059                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2060                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2061                                 udf_update_tag(oepos.bh->b_data,
2062                                                 epos.offset - adsize);
2063                         else
2064                                 udf_update_tag(oepos.bh->b_data,
2065                                                 sizeof(struct allocExtDesc));
2066                         mark_buffer_dirty_inode(oepos.bh, inode);
2067                 }
2068         }
2069
2070         brelse(epos.bh);
2071         brelse(oepos.bh);
2072
2073         return (elen >> 30);
2074 }
2075
2076 int8_t inode_bmap(struct inode *inode, sector_t block,
2077                   struct extent_position *pos, kernel_lb_addr *eloc,
2078                   uint32_t *elen, sector_t *offset)
2079 {
2080         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2081         loff_t lbcount = 0, bcount =
2082             (loff_t) block << blocksize_bits;
2083         int8_t etype;
2084
2085         if (block < 0) {
2086                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
2087                 return -1;
2088         }
2089
2090         pos->offset = 0;
2091         pos->block = UDF_I_LOCATION(inode);
2092         pos->bh = NULL;
2093         *elen = 0;
2094
2095         do {
2096                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2097                 if (etype == -1) {
2098                         *offset = (bcount - lbcount) >> blocksize_bits;
2099                         UDF_I_LENEXTENTS(inode) = lbcount;
2100                         return -1;
2101                 }
2102                 lbcount += *elen;
2103         } while (lbcount <= bcount);
2104
2105         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2106
2107         return etype;
2108 }
2109
2110 long udf_block_map(struct inode *inode, sector_t block)
2111 {
2112         kernel_lb_addr eloc;
2113         uint32_t elen;
2114         sector_t offset;
2115         struct extent_position epos = {};
2116         int ret;
2117
2118         lock_kernel();
2119
2120         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2121                                                 (EXT_RECORDED_ALLOCATED >> 30))
2122                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2123         else
2124                 ret = 0;
2125
2126         unlock_kernel();
2127         brelse(epos.bh);
2128
2129         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2130                 return udf_fixed_to_variable(ret);
2131         else
2132                 return ret;
2133 }