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 and udf_read_inode
  23  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  24  *                block boundaries (which is not actually allowed)
  25  *  12/20/98      added support for strategy 4096
  26  *  03/07/99      rewrote udf_block_map (again)
  27  *                New funcs, inode_bmap, udf_next_aext
  28  *  04/19/99      Support for writing device EA's for major/minor #
  29  */
  30
  31 #include "udfdecl.h"
  32 #include <linux/mm.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38 #include <linux/slab.h>
  39
  40 #include "udf_i.h"
  41 #include "udf_sb.h"
  42
  43 MODULE_AUTHOR("Ben Fennema");
  44 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  45 MODULE_LICENSE("GPL");
  46
  47 #define EXTENT_MERGE_SIZE 5
  48
  49 static mode_t udf_convert_permissions(struct fileEntry *);
  50 static int udf_update_inode(struct inode *, int);
  51 static void udf_fill_inode(struct inode *, struct buffer_head *);
  52 static int udf_alloc_i_data(struct inode *inode, size_t size);
  53 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  54                                         long *, int *);
  55 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  56                               kernel_lb_addr, uint32_t);
  57 static void udf_split_extents(struct inode *, int *, int, int,
  58                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  59 static void udf_prealloc_extents(struct inode *, int, int,
  60                                  kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_merge_extents(struct inode *,
  62                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_update_extents(struct inode *,
  64                                kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  65                                struct extent_position *);
  66 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  67
  68 /*
  69  * udf_delete_inode
  70  *
  71  * PURPOSE
  72  *      Clean-up before the specified inode is destroyed.
  73  *
  74  * DESCRIPTION
  75  *      This routine is called when the kernel destroys an inode structure
  76  *      ie. when iput() finds i_count == 0.
  77  *
  78  * HISTORY
  79  *      July 1, 1997 - Andrew E. Mileski
  80  *      Written, tested, and released.
  81  *
  82  *  Called at the last iput() if i_nlink is zero.
  83  */
  84 void udf_delete_inode(struct inode *inode)
  85 {
  86         truncate_inode_pages(&inode->i_data, 0);
  87
  88         if (is_bad_inode(inode))
  89                 goto no_delete;
  90
  91         inode->i_size = 0;
  92         udf_truncate(inode);
  93         lock_kernel();
  94
  95         udf_update_inode(inode, IS_SYNC(inode));
  96         udf_free_inode(inode);
  97
  98         unlock_kernel();
  99         return;
 100
 101 no_delete:
 102         clear_inode(inode);
 103 }
 104
 105 /*
 106  * If we are going to release inode from memory, we discard preallocation and
 107  * truncate last inode extent to proper length. We could use drop_inode() but
 108  * it's called under inode_lock and thus we cannot mark inode dirty there.  We
 109  * use clear_inode() but we have to make sure to write inode as it's not written
 110  * automatically.
 111  */
 112 void udf_clear_inode(struct inode *inode)
 113 {
 114         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 115                 lock_kernel();
 116                 /* Discard preallocation for directories, symlinks, etc. */
 117                 udf_discard_prealloc(inode);
 118                 udf_truncate_tail_extent(inode);
 119                 unlock_kernel();
 120                 write_inode_now(inode, 1);
 121         }
 122         kfree(UDF_I_DATA(inode));
 123         UDF_I_DATA(inode) = NULL;
 124 }
 125
 126 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 127 {
 128         return block_write_full_page(page, udf_get_block, wbc);
 129 }
 130
 131 static int udf_readpage(struct file *file, struct page *page)
 132 {
 133         return block_read_full_page(page, udf_get_block);
 134 }
 135
 136 static int udf_write_begin(struct file *file, struct address_space *mapping,
 137                         loff_t pos, unsigned len, unsigned flags,
 138                         struct page **pagep, void **fsdata)
 139 {
 140         *pagep = NULL;
 141         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 142                                 udf_get_block);
 143 }
 144
 145 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 146 {
 147         return generic_block_bmap(mapping, block, udf_get_block);
 148 }
 149
 150 const struct address_space_operations udf_aops = {
 151         .readpage       = udf_readpage,
 152         .writepage      = udf_writepage,
 153         .sync_page      = block_sync_page,
 154         .write_begin            = udf_write_begin,
 155         .write_end              = generic_write_end,
 156         .bmap           = udf_bmap,
 157 };
 158
 159 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 160 {
 161         struct page *page;
 162         char *kaddr;
 163         struct writeback_control udf_wbc = {
 164                 .sync_mode = WB_SYNC_NONE,
 165                 .nr_to_write = 1,
 166         };
 167
 168         /* from now on we have normal address_space methods */
 169         inode->i_data.a_ops = &udf_aops;
 170
 171         if (!UDF_I_LENALLOC(inode)) {
 172                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 173                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 174                 else
 175                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 176                 mark_inode_dirty(inode);
 177                 return;
 178         }
 179
 180         page = grab_cache_page(inode->i_mapping, 0);
 181         BUG_ON(!PageLocked(page));
 182
 183         if (!PageUptodate(page)) {
 184                 kaddr = kmap(page);
 185                 memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
 186                        PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
 187                 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
 188                        UDF_I_LENALLOC(inode));
 189                 flush_dcache_page(page);
 190                 SetPageUptodate(page);
 191                 kunmap(page);
 192         }
 193         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
 194                UDF_I_LENALLOC(inode));
 195         UDF_I_LENALLOC(inode) = 0;
 196         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 197                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 198         else
 199                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 200
 201         inode->i_data.a_ops->writepage(page, &udf_wbc);
 202         page_cache_release(page);
 203
 204         mark_inode_dirty(inode);
 205 }
 206
 207 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 208                                            int *err)
 209 {
 210         int newblock;
 211         struct buffer_head *dbh = NULL;
 212         kernel_lb_addr eloc;
 213         uint32_t elen;
 214         uint8_t alloctype;
 215         struct extent_position epos;
 216
 217         struct udf_fileident_bh sfibh, dfibh;
 218         loff_t f_pos = udf_ext0_offset(inode) >> 2;
 219         int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
 220         struct fileIdentDesc cfi, *sfi, *dfi;
 221
 222         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 223                 alloctype = ICBTAG_FLAG_AD_SHORT;
 224         else
 225                 alloctype = ICBTAG_FLAG_AD_LONG;
 226
 227         if (!inode->i_size) {
 228                 UDF_I_ALLOCTYPE(inode) = alloctype;
 229                 mark_inode_dirty(inode);
 230                 return NULL;
 231         }
 232
 233         /* alloc block, and copy data to it */
 234         *block = udf_new_block(inode->i_sb, inode,
 235                                UDF_I_LOCATION(inode).partitionReferenceNum,
 236                                UDF_I_LOCATION(inode).logicalBlockNum, err);
 237         if (!(*block))
 238                 return NULL;
 239         newblock = udf_get_pblock(inode->i_sb, *block,
 240                                   UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 241         if (!newblock)
 242                 return NULL;
 243         dbh = udf_tgetblk(inode->i_sb, newblock);
 244         if (!dbh)
 245                 return NULL;
 246         lock_buffer(dbh);
 247         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 248         set_buffer_uptodate(dbh);
 249         unlock_buffer(dbh);
 250         mark_buffer_dirty_inode(dbh, inode);
 251
 252         sfibh.soffset = sfibh.eoffset = (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2;
 253         sfibh.sbh = sfibh.ebh = NULL;
 254         dfibh.soffset = dfibh.eoffset = 0;
 255         dfibh.sbh = dfibh.ebh = dbh;
 256         while ((f_pos < size)) {
 257                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 258                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL);
 259                 if (!sfi) {
 260                         brelse(dbh);
 261                         return NULL;
 262                 }
 263                 UDF_I_ALLOCTYPE(inode) = alloctype;
 264                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 265                 dfibh.soffset = dfibh.eoffset;
 266                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 267                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 268                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 269                                  sfi->fileIdent + le16_to_cpu(sfi->lengthOfImpUse))) {
 270                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 271                         brelse(dbh);
 272                         return NULL;
 273                 }
 274         }
 275         mark_buffer_dirty_inode(dbh, inode);
 276
 277         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode));
 278         UDF_I_LENALLOC(inode) = 0;
 279         eloc.logicalBlockNum = *block;
 280         eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 281         elen = inode->i_size;
 282         UDF_I_LENEXTENTS(inode) = elen;
 283         epos.bh = NULL;
 284         epos.block = UDF_I_LOCATION(inode);
 285         epos.offset = udf_file_entry_alloc_offset(inode);
 286         udf_add_aext(inode, &epos, eloc, elen, 0);
 287         /* UniqueID stuff */
 288
 289         brelse(epos.bh);
 290         mark_inode_dirty(inode);
 291         return dbh;
 292 }
 293
 294 static int udf_get_block(struct inode *inode, sector_t block,
 295                          struct buffer_head *bh_result, int create)
 296 {
 297         int err, new;
 298         struct buffer_head *bh;
 299         unsigned long phys;
 300
 301         if (!create) {
 302                 phys = udf_block_map(inode, block);
 303                 if (phys)
 304                         map_bh(bh_result, inode->i_sb, phys);
 305                 return 0;
 306         }
 307
 308         err = -EIO;
 309         new = 0;
 310         bh = NULL;
 311
 312         lock_kernel();
 313
 314         if (block < 0)
 315                 goto abort_negative;
 316
 317         if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1) {
 318                 UDF_I_NEXT_ALLOC_BLOCK(inode)++;
 319                 UDF_I_NEXT_ALLOC_GOAL(inode)++;
 320         }
 321
 322         err = 0;
 323
 324         bh = inode_getblk(inode, block, &err, &phys, &new);
 325         BUG_ON(bh);
 326         if (err)
 327                 goto abort;
 328         BUG_ON(!phys);
 329
 330         if (new)
 331                 set_buffer_new(bh_result);
 332         map_bh(bh_result, inode->i_sb, phys);
 333
 334 abort:
 335         unlock_kernel();
 336         return err;
 337
 338 abort_negative:
 339         udf_warning(inode->i_sb, "udf_get_block", "block < 0");
 340         goto abort;
 341 }
 342
 343 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 344                                       int create, int *err)
 345 {
 346         struct buffer_head *bh;
 347         struct buffer_head dummy;
 348
 349         dummy.b_state = 0;
 350         dummy.b_blocknr = -1000;
 351         *err = udf_get_block(inode, block, &dummy, create);
 352         if (!*err && buffer_mapped(&dummy)) {
 353                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 354                 if (buffer_new(&dummy)) {
 355                         lock_buffer(bh);
 356                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 357                         set_buffer_uptodate(bh);
 358                         unlock_buffer(bh);
 359                         mark_buffer_dirty_inode(bh, inode);
 360                 }
 361                 return bh;
 362         }
 363
 364         return NULL;
 365 }
 366
 367 /* Extend the file by 'blocks' blocks, return the number of extents added */
 368 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 369                     kernel_long_ad * last_ext, sector_t blocks)
 370 {
 371         sector_t add;
 372         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 373         struct super_block *sb = inode->i_sb;
 374         kernel_lb_addr prealloc_loc = {};
 375         int prealloc_len = 0;
 376
 377         /* The previous extent is fake and we should not extend by anything
 378          * - there's nothing to do... */
 379         if (!blocks && fake)
 380                 return 0;
 381
 382         /* Round the last extent up to a multiple of block size */
 383         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 384                 last_ext->extLength =
 385                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 386                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 387                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 388                 UDF_I_LENEXTENTS(inode) =
 389                         (UDF_I_LENEXTENTS(inode) + sb->s_blocksize - 1) &
 390                         ~(sb->s_blocksize - 1);
 391         }
 392
 393         /* Last extent are just preallocated blocks? */
 394         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_ALLOCATED) {
 395                 /* Save the extent so that we can reattach it to the end */
 396                 prealloc_loc = last_ext->extLocation;
 397                 prealloc_len = last_ext->extLength;
 398                 /* Mark the extent as a hole */
 399                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 400                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 401                 last_ext->extLocation.logicalBlockNum = 0;
 402                 last_ext->extLocation.partitionReferenceNum = 0;
 403         }
 404
 405         /* Can we merge with the previous extent? */
 406         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) == EXT_NOT_RECORDED_NOT_ALLOCATED) {
 407                 add = ((1 << 30) - sb->s_blocksize - (last_ext->extLength &
 408                                                       UDF_EXTENT_LENGTH_MASK)) >> sb->s_blocksize_bits;
 409                 if (add > blocks)
 410                         add = blocks;
 411                 blocks -= add;
 412                 last_ext->extLength += add << sb->s_blocksize_bits;
 413         }
 414
 415         if (fake) {
 416                 udf_add_aext(inode, last_pos, last_ext->extLocation,
 417                              last_ext->extLength, 1);
 418                 count++;
 419         } else {
 420                 udf_write_aext(inode, last_pos, last_ext->extLocation, last_ext->extLength, 1);
 421         }
 422
 423         /* Managed to do everything necessary? */
 424         if (!blocks)
 425                 goto out;
 426
 427         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 428         last_ext->extLocation.logicalBlockNum = 0;
 429         last_ext->extLocation.partitionReferenceNum = 0;
 430         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 431         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | (add << sb->s_blocksize_bits);
 432
 433         /* Create enough extents to cover the whole hole */
 434         while (blocks > add) {
 435                 blocks -= add;
 436                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 437                                  last_ext->extLength, 1) == -1)
 438                         return -1;
 439                 count++;
 440         }
 441         if (blocks) {
 442                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 443                         (blocks << sb->s_blocksize_bits);
 444                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 445                                  last_ext->extLength, 1) == -1)
 446                         return -1;
 447                 count++;
 448         }
 449
 450 out:
 451         /* Do we have some preallocated blocks saved? */
 452         if (prealloc_len) {
 453                 if (udf_add_aext(inode, last_pos, prealloc_loc, prealloc_len, 1) == -1)
 454                         return -1;
 455                 last_ext->extLocation = prealloc_loc;
 456                 last_ext->extLength = prealloc_len;
 457                 count++;
 458         }
 459
 460         /* last_pos should point to the last written extent... */
 461         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
 462                 last_pos->offset -= sizeof(short_ad);
 463         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
 464                 last_pos->offset -= sizeof(long_ad);
 465         else
 466                 return -1;
 467
 468         return count;
 469 }
 470
 471 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 472                                         int *err, long *phys, int *new)
 473 {
 474         static sector_t last_block;
 475         struct buffer_head *result = NULL;
 476         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 477         struct extent_position prev_epos, cur_epos, next_epos;
 478         int count = 0, startnum = 0, endnum = 0;
 479         uint32_t elen = 0, tmpelen;
 480         kernel_lb_addr eloc, tmpeloc;
 481         int c = 1;
 482         loff_t lbcount = 0, b_off = 0;
 483         uint32_t newblocknum, newblock;
 484         sector_t offset = 0;
 485         int8_t etype;
 486         int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
 487         int lastblock = 0;
 488
 489         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 490         prev_epos.block = UDF_I_LOCATION(inode);
 491         prev_epos.bh = NULL;
 492         cur_epos = next_epos = prev_epos;
 493         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 494
 495         /* find the extent which contains the block we are looking for.
 496            alternate between laarr[0] and laarr[1] for locations of the
 497            current extent, and the previous extent */
 498         do {
 499                 if (prev_epos.bh != cur_epos.bh) {
 500                         brelse(prev_epos.bh);
 501                         get_bh(cur_epos.bh);
 502                         prev_epos.bh = cur_epos.bh;
 503                 }
 504                 if (cur_epos.bh != next_epos.bh) {
 505                         brelse(cur_epos.bh);
 506                         get_bh(next_epos.bh);
 507                         cur_epos.bh = next_epos.bh;
 508                 }
 509
 510                 lbcount += elen;
 511
 512                 prev_epos.block = cur_epos.block;
 513                 cur_epos.block = next_epos.block;
 514
 515                 prev_epos.offset = cur_epos.offset;
 516                 cur_epos.offset = next_epos.offset;
 517
 518                 if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1)) == -1)
 519                         break;
 520
 521                 c = !c;
 522
 523                 laarr[c].extLength = (etype << 30) | elen;
 524                 laarr[c].extLocation = eloc;
 525
 526                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 527                         pgoal = eloc.logicalBlockNum +
 528                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 529                                  inode->i_sb->s_blocksize_bits);
 530
 531                 count++;
 532         } while (lbcount + elen <= b_off);
 533
 534         b_off -= lbcount;
 535         offset = b_off >> inode->i_sb->s_blocksize_bits;
 536         /*
 537          * Move prev_epos and cur_epos into indirect extent if we are at
 538          * the pointer to it
 539          */
 540         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 541         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 542
 543         /* if the extent is allocated and recorded, return the block
 544            if the extent is not a multiple of the blocksize, round up */
 545
 546         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 547                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 548                         elen = EXT_RECORDED_ALLOCATED |
 549                                 ((elen + inode->i_sb->s_blocksize - 1) &
 550                                  ~(inode->i_sb->s_blocksize - 1));
 551                         etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
 552                 }
 553                 brelse(prev_epos.bh);
 554                 brelse(cur_epos.bh);
 555                 brelse(next_epos.bh);
 556                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 557                 *phys = newblock;
 558                 return NULL;
 559         }
 560
 561         last_block = block;
 562         /* Are we beyond EOF? */
 563         if (etype == -1) {
 564                 int ret;
 565
 566                 if (count) {
 567                         if (c)
 568                                 laarr[0] = laarr[1];
 569                         startnum = 1;
 570                 } else {
 571                         /* Create a fake extent when there's not one */
 572                         memset(&laarr[0].extLocation, 0x00, sizeof(kernel_lb_addr));
 573                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 574                         /* Will udf_extend_file() create real extent from a fake one? */
 575                         startnum = (offset > 0);
 576                 }
 577                 /* Create extents for the hole between EOF and offset */
 578                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 579                 if (ret == -1) {
 580                         brelse(prev_epos.bh);
 581                         brelse(cur_epos.bh);
 582                         brelse(next_epos.bh);
 583                         /* We don't really know the error here so we just make
 584                          * something up */
 585                         *err = -ENOSPC;
 586                         return NULL;
 587                 }
 588                 c = 0;
 589                 offset = 0;
 590                 count += ret;
 591                 /* We are not covered by a preallocated extent? */
 592                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) != EXT_NOT_RECORDED_ALLOCATED) {
 593                         /* Is there any real extent? - otherwise we overwrite
 594                          * the fake one... */
 595                         if (count)
 596                                 c = !c;
 597                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 598                                 inode->i_sb->s_blocksize;
 599                         memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
 600                         count++;
 601                         endnum++;
 602                 }
 603                 endnum = c + 1;
 604                 lastblock = 1;
 605         } else {
 606                 endnum = startnum = ((count > 2) ? 2 : count);
 607
 608                 /* if the current extent is in position 0, swap it with the previous */
 609                 if (!c && count != 1) {
 610                         laarr[2] = laarr[0];
 611                         laarr[0] = laarr[1];
 612                         laarr[1] = laarr[2];
 613                         c = 1;
 614                 }
 615
 616                 /* if the current block is located in an extent, read the next extent */
 617                 if ((etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0)) != -1) {
 618                         laarr[c + 1].extLength = (etype << 30) | elen;
 619                         laarr[c + 1].extLocation = eloc;
 620                         count++;
 621                         startnum++;
 622                         endnum++;
 623                 } else {
 624                         lastblock = 1;
 625                 }
 626         }
 627
 628         /* if the current extent is not recorded but allocated, get the
 629          * block in the extent corresponding to the requested block */
 630         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 631                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 632         } else { /* otherwise, allocate a new block */
 633                 if (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
 634                         goal = UDF_I_NEXT_ALLOC_GOAL(inode);
 635
 636                 if (!goal) {
 637                         if (!(goal = pgoal))
 638                                 goal = UDF_I_LOCATION(inode).logicalBlockNum + 1;
 639                 }
 640
 641                 if (!(newblocknum = udf_new_block(inode->i_sb, inode,
 642                                                   UDF_I_LOCATION(inode).partitionReferenceNum,
 643                                                   goal, err))) {
 644                         brelse(prev_epos.bh);
 645                         *err = -ENOSPC;
 646                         return NULL;
 647                 }
 648                 UDF_I_LENEXTENTS(inode) += inode->i_sb->s_blocksize;
 649         }
 650
 651         /* if the extent the requsted block is located in contains multiple blocks,
 652          * split the extent into at most three extents. blocks prior to requested
 653          * block, requested block, and blocks after requested block */
 654         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 655
 656 #ifdef UDF_PREALLOCATE
 657         /* preallocate blocks */
 658         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 659 #endif
 660
 661         /* merge any continuous blocks in laarr */
 662         udf_merge_extents(inode, laarr, &endnum);
 663
 664         /* write back the new extents, inserting new extents if the new number
 665          * of extents is greater than the old number, and deleting extents if
 666          * the new number of extents is less than the old number */
 667         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 668
 669         brelse(prev_epos.bh);
 670
 671         if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum,
 672                                         UDF_I_LOCATION(inode).partitionReferenceNum, 0))) {
 673                 return NULL;
 674         }
 675         *phys = newblock;
 676         *err = 0;
 677         *new = 1;
 678         UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
 679         UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum;
 680         inode->i_ctime = current_fs_time(inode->i_sb);
 681
 682         if (IS_SYNC(inode))
 683                 udf_sync_inode(inode);
 684         else
 685                 mark_inode_dirty(inode);
 686
 687         return result;
 688 }
 689
 690 static void udf_split_extents(struct inode *inode, int *c, int offset,
 691                               int newblocknum,
 692                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 693                               int *endnum)
 694 {
 695         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 696             (laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 697                 int curr = *c;
 698                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 699                             inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 700                 int8_t etype = (laarr[curr].extLength >> 30);
 701
 702                 if (blen == 1) {
 703                         ;
 704                 } else if (!offset || blen == offset + 1) {
 705                         laarr[curr + 2] = laarr[curr + 1];
 706                         laarr[curr + 1] = laarr[curr];
 707                 } else {
 708                         laarr[curr + 3] = laarr[curr + 1];
 709                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 710                 }
 711
 712                 if (offset) {
 713                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 714                                 udf_free_blocks(inode->i_sb, inode, laarr[curr].extLocation, 0, offset);
 715                                 laarr[curr].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 716                                         (offset << inode->i_sb->s_blocksize_bits);
 717                                 laarr[curr].extLocation.logicalBlockNum = 0;
 718                                 laarr[curr].extLocation.partitionReferenceNum = 0;
 719                         } else {
 720                                 laarr[curr].extLength = (etype << 30) |
 721                                         (offset << inode->i_sb->s_blocksize_bits);
 722                         }
 723                         curr++;
 724                         (*c)++;
 725                         (*endnum)++;
 726                 }
 727
 728                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 729                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 730                         laarr[curr].extLocation.partitionReferenceNum =
 731                                 UDF_I_LOCATION(inode).partitionReferenceNum;
 732                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 733                         inode->i_sb->s_blocksize;
 734                 curr++;
 735
 736                 if (blen != offset + 1) {
 737                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 738                                 laarr[curr].extLocation.logicalBlockNum += (offset + 1);
 739                         laarr[curr].extLength = (etype << 30) |
 740                                 ((blen - (offset + 1)) << inode->i_sb->s_blocksize_bits);
 741                         curr++;
 742                         (*endnum)++;
 743                 }
 744         }
 745 }
 746
 747 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 748                                  kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 749                                  int *endnum)
 750 {
 751         int start, length = 0, currlength = 0, i;
 752
 753         if (*endnum >= (c + 1)) {
 754                 if (!lastblock)
 755                         return;
 756                 else
 757                         start = c;
 758         } else {
 759                 if ((laarr[c + 1].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 760                         start = c + 1;
 761                         length = currlength = (((laarr[c + 1].extLength & UDF_EXTENT_LENGTH_MASK) +
 762                                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 763                 } else {
 764                         start = c;
 765                 }
 766         }
 767
 768         for (i = start + 1; i <= *endnum; i++) {
 769                 if (i == *endnum) {
 770                         if (lastblock)
 771                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 772                 } else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 773                         length += (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 774                                     inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 775                 } else {
 776                         break;
 777                 }
 778         }
 779
 780         if (length) {
 781                 int next = laarr[start].extLocation.logicalBlockNum +
 782                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 783                           inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 784                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 785                                                    laarr[start].extLocation.partitionReferenceNum,
 786                                                    next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? length :
 787                                                           UDF_DEFAULT_PREALLOC_BLOCKS) - currlength);
 788                 if (numalloc)   {
 789                         if (start == (c + 1)) {
 790                                 laarr[start].extLength +=
 791                                         (numalloc << inode->i_sb->s_blocksize_bits);
 792                         } else {
 793                                 memmove(&laarr[c + 2], &laarr[c + 1],
 794                                         sizeof(long_ad) * (*endnum - (c + 1)));
 795                                 (*endnum)++;
 796                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 797                                 laarr[c + 1].extLocation.partitionReferenceNum =
 798                                         laarr[c].extLocation.partitionReferenceNum;
 799                                 laarr[c + 1].extLength = EXT_NOT_RECORDED_ALLOCATED |
 800                                         (numalloc << inode->i_sb->s_blocksize_bits);
 801                                 start = c + 1;
 802                         }
 803
 804                         for (i = start + 1; numalloc && i < *endnum; i++) {
 805                                 int elen = ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 806                                             inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 807
 808                                 if (elen > numalloc) {
 809                                         laarr[i].extLength -=
 810                                                 (numalloc << inode->i_sb->s_blocksize_bits);
 811                                         numalloc = 0;
 812                                 } else {
 813                                         numalloc -= elen;
 814                                         if (*endnum > (i + 1))
 815                                                 memmove(&laarr[i], &laarr[i + 1],
 816                                                         sizeof(long_ad) * (*endnum - (i + 1)));
 817                                         i--;
 818                                         (*endnum)--;
 819                                 }
 820                         }
 821                         UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
 822                 }
 823         }
 824 }
 825
 826 static void udf_merge_extents(struct inode *inode,
 827                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 828                               int *endnum)
 829 {
 830         int i;
 831
 832         for (i = 0; i < (*endnum - 1); i++) {
 833                 if ((laarr[i].extLength >> 30) == (laarr[i + 1].extLength >> 30)) {
 834                         if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 835                             ((laarr[i + 1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) ==
 836                              (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 837                                inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits))) {
 838                                 if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 839                                      (laarr[i + 1].extLength & UDF_EXTENT_LENGTH_MASK) +
 840                                      inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 841                                         laarr[i + 1].extLength = (laarr[i + 1].extLength -
 842                                                                   (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 843                                                                   UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize - 1);
 844                                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 845                                                 (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 846                                         laarr[i + 1].extLocation.logicalBlockNum =
 847                                                 laarr[i].extLocation.logicalBlockNum +
 848                                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >>
 849                                                  inode->i_sb->s_blocksize_bits);
 850                                 } else {
 851                                         laarr[i].extLength = laarr[i + 1].extLength +
 852                                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 853                                                   inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize - 1));
 854                                         if (*endnum > (i + 2))
 855                                                 memmove(&laarr[i + 1], &laarr[i + 2],
 856                                                         sizeof(long_ad) * (*endnum - (i + 2)));
 857                                         i--;
 858                                         (*endnum)--;
 859                                 }
 860                         }
 861                 } else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 862                            ((laarr[i + 1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 863                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 864                                         ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 865                                          inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 866                         laarr[i].extLocation.logicalBlockNum = 0;
 867                         laarr[i].extLocation.partitionReferenceNum = 0;
 868
 869                         if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 870                              (laarr[i + 1].extLength & UDF_EXTENT_LENGTH_MASK) +
 871                              inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 872                                 laarr[i + 1].extLength = (laarr[i + 1].extLength -
 873                                                           (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 874                                                           UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize - 1);
 875                                 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 876                                         (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 877                         } else {
 878                                 laarr[i].extLength = laarr[i + 1].extLength +
 879                                         (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 880                                           inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize - 1));
 881                                 if (*endnum > (i + 2))
 882                                         memmove(&laarr[i + 1], &laarr[i + 2],
 883                                                 sizeof(long_ad) * (*endnum - (i + 2)));
 884                                 i--;
 885                                 (*endnum)--;
 886                         }
 887                 } else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 888                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 889                                         ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 890                                          inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 891                         laarr[i].extLocation.logicalBlockNum = 0;
 892                         laarr[i].extLocation.partitionReferenceNum = 0;
 893                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) |
 894                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 895                 }
 896         }
 897 }
 898
 899 static void udf_update_extents(struct inode *inode,
 900                                kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 901                                int startnum, int endnum,
 902                                struct extent_position *epos)
 903 {
 904         int start = 0, i;
 905         kernel_lb_addr tmploc;
 906         uint32_t tmplen;
 907
 908         if (startnum > endnum) {
 909                 for (i = 0; i < (startnum - endnum); i++)
 910                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 911                                         laarr[i].extLength);
 912         } else if (startnum < endnum) {
 913                 for (i = 0; i < (endnum - startnum); i++) {
 914                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 915                                         laarr[i].extLength);
 916                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 917                                       &laarr[i].extLength, 1);
 918                         start++;
 919                 }
 920         }
 921
 922         for (i = start; i < endnum; i++) {
 923                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 924                 udf_write_aext(inode, epos, laarr[i].extLocation,
 925                                laarr[i].extLength, 1);
 926         }
 927 }
 928
 929 struct buffer_head *udf_bread(struct inode *inode, int block,
 930                               int create, int *err)
 931 {
 932         struct buffer_head *bh = NULL;
 933
 934         bh = udf_getblk(inode, block, create, err);
 935         if (!bh)
 936                 return NULL;
 937
 938         if (buffer_uptodate(bh))
 939                 return bh;
 940
 941         ll_rw_block(READ, 1, &bh);
 942
 943         wait_on_buffer(bh);
 944         if (buffer_uptodate(bh))
 945                 return bh;
 946
 947         brelse(bh);
 948         *err = -EIO;
 949         return NULL;
 950 }
 951
 952 void udf_truncate(struct inode *inode)
 953 {
 954         int offset;
 955         int err;
 956
 957         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 958               S_ISLNK(inode->i_mode)))
 959                 return;
 960         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
 961                 return;
 962
 963         lock_kernel();
 964         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
 965                 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
 966                                                 inode->i_size)) {
 967                         udf_expand_file_adinicb(inode, inode->i_size, &err);
 968                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB) {
 969                                 inode->i_size = UDF_I_LENALLOC(inode);
 970                                 unlock_kernel();
 971                                 return;
 972                         } else {
 973                                 udf_truncate_extents(inode);
 974                         }
 975                 } else {
 976                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
 977                         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00,
 978                                inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode));
 979                         UDF_I_LENALLOC(inode) = inode->i_size;
 980                 }
 981         } else {
 982                 block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block);
 983                 udf_truncate_extents(inode);
 984         }
 985
 986         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
 987         if (IS_SYNC(inode))
 988                 udf_sync_inode(inode);
 989         else
 990                 mark_inode_dirty(inode);
 991         unlock_kernel();
 992 }
 993
 994 static void __udf_read_inode(struct inode *inode)
 995 {
 996         struct buffer_head *bh = NULL;
 997         struct fileEntry *fe;
 998         uint16_t ident;
 999
1000         /*
1001          * Set defaults, but the inode is still incomplete!
1002          * Note: get_new_inode() sets the following on a new inode:
1003          *      i_sb = sb
1004          *      i_no = ino
1005          *      i_flags = sb->s_flags
1006          *      i_state = 0
1007          * clean_inode(): zero fills and sets
1008          *      i_count = 1
1009          *      i_nlink = 1
1010          *      i_op = NULL;
1011          */
1012         bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
1013         if (!bh) {
1014                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1015                        inode->i_ino);
1016                 make_bad_inode(inode);
1017                 return;
1018         }
1019
1020         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1021             ident != TAG_IDENT_USE) {
1022                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n",
1023                        inode->i_ino, ident);
1024                 brelse(bh);
1025                 make_bad_inode(inode);
1026                 return;
1027         }
1028
1029         fe = (struct fileEntry *)bh->b_data;
1030
1031         if (le16_to_cpu(fe->icbTag.strategyType) == 4096) {
1032                 struct buffer_head *ibh = NULL, *nbh = NULL;
1033                 struct indirectEntry *ie;
1034
1035                 ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
1036                 if (ident == TAG_IDENT_IE) {
1037                         if (ibh) {
1038                                 kernel_lb_addr loc;
1039                                 ie = (struct indirectEntry *)ibh->b_data;
1040
1041                                 loc = lelb_to_cpu(ie->indirectICB.extLocation);
1042
1043                                 if (ie->indirectICB.extLength &&
1044                                     (nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident))) {
1045                                         if (ident == TAG_IDENT_FE ||
1046                                             ident == TAG_IDENT_EFE) {
1047                                                 memcpy(&UDF_I_LOCATION(inode), &loc,
1048                                                        sizeof(kernel_lb_addr));
1049                                                 brelse(bh);
1050                                                 brelse(ibh);
1051                                                 brelse(nbh);
1052                                                 __udf_read_inode(inode);
1053                                                 return;
1054                                         } else {
1055                                                 brelse(nbh);
1056                                                 brelse(ibh);
1057                                         }
1058                                 } else {
1059                                         brelse(ibh);
1060                                 }
1061                         }
1062                 } else {
1063                         brelse(ibh);
1064                 }
1065         } else if (le16_to_cpu(fe->icbTag.strategyType) != 4) {
1066                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1067                        le16_to_cpu(fe->icbTag.strategyType));
1068                 brelse(bh);
1069                 make_bad_inode(inode);
1070                 return;
1071         }
1072         udf_fill_inode(inode, bh);
1073
1074         brelse(bh);
1075 }
1076
1077 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1078 {
1079         struct fileEntry *fe;
1080         struct extendedFileEntry *efe;
1081         time_t convtime;
1082         long convtime_usec;
1083         int offset;
1084         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1085
1086         fe = (struct fileEntry *)bh->b_data;
1087         efe = (struct extendedFileEntry *)bh->b_data;
1088
1089         if (le16_to_cpu(fe->icbTag.strategyType) == 4)
1090                 UDF_I_STRAT4096(inode) = 0;
1091         else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
1092                 UDF_I_STRAT4096(inode) = 1;
1093
1094         UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
1095         UDF_I_UNIQUE(inode) = 0;
1096         UDF_I_LENEATTR(inode) = 0;
1097         UDF_I_LENEXTENTS(inode) = 0;
1098         UDF_I_LENALLOC(inode) = 0;
1099         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
1100         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
1101         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE) {
1102                 UDF_I_EFE(inode) = 1;
1103                 UDF_I_USE(inode) = 0;
1104                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry))) {
1105                         make_bad_inode(inode);
1106                         return;
1107                 }
1108                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry),
1109                        inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1110         } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE) {
1111                 UDF_I_EFE(inode) = 0;
1112                 UDF_I_USE(inode) = 0;
1113                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct fileEntry))) {
1114                         make_bad_inode(inode);
1115                         return;
1116                 }
1117                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry),
1118                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1119         } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) {
1120                 UDF_I_EFE(inode) = 0;
1121                 UDF_I_USE(inode) = 1;
1122                 UDF_I_LENALLOC(inode) =
1123                     le32_to_cpu(((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
1124                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry))) {
1125                         make_bad_inode(inode);
1126                         return;
1127                 }
1128                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry),
1129                        inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1130                 return;
1131         }
1132
1133         inode->i_uid = le32_to_cpu(fe->uid);
1134         if (inode->i_uid == -1 ||
1135             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1136             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1137                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1138
1139         inode->i_gid = le32_to_cpu(fe->gid);
1140         if (inode->i_gid == -1 ||
1141             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1142             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1143                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1144
1145         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1146         if (!inode->i_nlink)
1147                 inode->i_nlink = 1;
1148
1149         inode->i_size = le64_to_cpu(fe->informationLength);
1150         UDF_I_LENEXTENTS(inode) = inode->i_size;
1151
1152         inode->i_mode = udf_convert_permissions(fe);
1153         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1154
1155         if (UDF_I_EFE(inode) == 0) {
1156                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1157                         (inode->i_sb->s_blocksize_bits - 9);
1158
1159                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1160                                       lets_to_cpu(fe->accessTime))) {
1161                         inode->i_atime.tv_sec = convtime;
1162                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1163                 } else {
1164                         inode->i_atime = sbi->s_record_time;
1165                 }
1166
1167                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1168                                       lets_to_cpu(fe->modificationTime))) {
1169                         inode->i_mtime.tv_sec = convtime;
1170                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1171                 } else {
1172                         inode->i_mtime = sbi->s_record_time;
1173                 }
1174
1175                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1176                                       lets_to_cpu(fe->attrTime))) {
1177                         inode->i_ctime.tv_sec = convtime;
1178                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1179                 } else {
1180                         inode->i_ctime = sbi->s_record_time;
1181                 }
1182
1183                 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
1184                 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
1185                 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
1186                 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
1187         } else {
1188                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1189                     (inode->i_sb->s_blocksize_bits - 9);
1190
1191                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1192                                       lets_to_cpu(efe->accessTime))) {
1193                         inode->i_atime.tv_sec = convtime;
1194                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1195                 } else {
1196                         inode->i_atime = sbi->s_record_time;
1197                 }
1198
1199                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1200                                       lets_to_cpu(efe->modificationTime))) {
1201                         inode->i_mtime.tv_sec = convtime;
1202                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1203                 } else {
1204                         inode->i_mtime = sbi->s_record_time;
1205                 }
1206
1207                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1208                                       lets_to_cpu(efe->createTime))) {
1209                         UDF_I_CRTIME(inode).tv_sec = convtime;
1210                         UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
1211                 } else {
1212                         UDF_I_CRTIME(inode) = sbi->s_record_time;
1213                 }
1214
1215                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1216                                       lets_to_cpu(efe->attrTime))) {
1217                         inode->i_ctime.tv_sec = convtime;
1218                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1219                 } else {
1220                         inode->i_ctime = sbi->s_record_time;
1221                 }
1222
1223                 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
1224                 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
1225                 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
1226                 offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
1227         }
1228
1229         switch (fe->icbTag.fileType) {
1230         case ICBTAG_FILE_TYPE_DIRECTORY:
1231                 inode->i_op = &udf_dir_inode_operations;
1232                 inode->i_fop = &udf_dir_operations;
1233                 inode->i_mode |= S_IFDIR;
1234                 inc_nlink(inode);
1235                 break;
1236         case ICBTAG_FILE_TYPE_REALTIME:
1237         case ICBTAG_FILE_TYPE_REGULAR:
1238         case ICBTAG_FILE_TYPE_UNDEF:
1239                 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1240                         inode->i_data.a_ops = &udf_adinicb_aops;
1241                 else
1242                         inode->i_data.a_ops = &udf_aops;
1243                 inode->i_op = &udf_file_inode_operations;
1244                 inode->i_fop = &udf_file_operations;
1245                 inode->i_mode |= S_IFREG;
1246                 break;
1247         case ICBTAG_FILE_TYPE_BLOCK:
1248                 inode->i_mode |= S_IFBLK;
1249                 break;
1250         case ICBTAG_FILE_TYPE_CHAR:
1251                 inode->i_mode |= S_IFCHR;
1252                 break;
1253         case ICBTAG_FILE_TYPE_FIFO:
1254                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1255                 break;
1256         case ICBTAG_FILE_TYPE_SOCKET:
1257                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1258                 break;
1259         case ICBTAG_FILE_TYPE_SYMLINK:
1260                 inode->i_data.a_ops = &udf_symlink_aops;
1261                 inode->i_op = &page_symlink_inode_operations;
1262                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1263                 break;
1264         default:
1265                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
1266                        inode->i_ino, fe->icbTag.fileType);
1267                 make_bad_inode(inode);
1268                 return;
1269         }
1270         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1271                 struct deviceSpec *dsea = (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1272                 if (dsea) {
1273                         init_special_inode(inode, inode->i_mode,
1274                                            MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1275                                                  le32_to_cpu(dsea->minorDeviceIdent)));
1276                         /* Developer ID ??? */
1277                 } else {
1278                         make_bad_inode(inode);
1279                 }
1280         }
1281 }
1282
1283 static int udf_alloc_i_data(struct inode *inode, size_t size)
1284 {
1285         UDF_I_DATA(inode) = kmalloc(size, GFP_KERNEL);
1286
1287         if (!UDF_I_DATA(inode)) {
1288                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) no free memory\n",
1289                        inode->i_ino);
1290                 return -ENOMEM;
1291         }
1292
1293         return 0;
1294 }
1295
1296 static mode_t udf_convert_permissions(struct fileEntry *fe)
1297 {
1298         mode_t mode;
1299         uint32_t permissions;
1300         uint32_t flags;
1301
1302         permissions = le32_to_cpu(fe->permissions);
1303         flags = le16_to_cpu(fe->icbTag.flags);
1304
1305         mode =  (( permissions      ) & S_IRWXO) |
1306                 (( permissions >> 2 ) & S_IRWXG) |
1307                 (( permissions >> 4 ) & S_IRWXU) |
1308                 (( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1309                 (( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1310                 (( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1311
1312         return mode;
1313 }
1314
1315 /*
1316  * udf_write_inode
1317  *
1318  * PURPOSE
1319  *      Write out the specified inode.
1320  *
1321  * DESCRIPTION
1322  *      This routine is called whenever an inode is synced.
1323  *      Currently this routine is just a placeholder.
1324  *
1325  * HISTORY
1326  *      July 1, 1997 - Andrew E. Mileski
1327  *      Written, tested, and released.
1328  */
1329
1330 int udf_write_inode(struct inode *inode, int sync)
1331 {
1332         int ret;
1333
1334         lock_kernel();
1335         ret = udf_update_inode(inode, sync);
1336         unlock_kernel();
1337
1338         return ret;
1339 }
1340
1341 int udf_sync_inode(struct inode *inode)
1342 {
1343         return udf_update_inode(inode, 1);
1344 }
1345
1346 static int udf_update_inode(struct inode *inode, int do_sync)
1347 {
1348         struct buffer_head *bh = NULL;
1349         struct fileEntry *fe;
1350         struct extendedFileEntry *efe;
1351         uint32_t udfperms;
1352         uint16_t icbflags;
1353         uint16_t crclen;
1354         int i;
1355         kernel_timestamp cpu_time;
1356         int err = 0;
1357         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1358
1359         bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));
1360         if (!bh) {
1361                 udf_debug("bread failure\n");
1362                 return -EIO;
1363         }
1364
1365         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1366
1367         fe = (struct fileEntry *)bh->b_data;
1368         efe = (struct extendedFileEntry *)bh->b_data;
1369
1370         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) {
1371                 struct unallocSpaceEntry *use =
1372                         (struct unallocSpaceEntry *)bh->b_data;
1373
1374                 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1375                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode),
1376                        inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1377                 crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) - sizeof(tag);
1378                 use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1379                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1380                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));
1381
1382                 use->descTag.tagChecksum = 0;
1383                 for (i = 0; i < 16; i++) {
1384                         if (i != 4)
1385                                 use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];
1386                 }
1387
1388                 mark_buffer_dirty(bh);
1389                 brelse(bh);
1390                 return err;
1391         }
1392
1393         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1394                 fe->uid = cpu_to_le32(-1);
1395         else
1396                 fe->uid = cpu_to_le32(inode->i_uid);
1397
1398         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1399                 fe->gid = cpu_to_le32(-1);
1400         else
1401                 fe->gid = cpu_to_le32(inode->i_gid);
1402
1403         udfperms =      ((inode->i_mode & S_IRWXO)     ) |
1404                         ((inode->i_mode & S_IRWXG) << 2) |
1405                         ((inode->i_mode & S_IRWXU) << 4);
1406
1407         udfperms |=     (le32_to_cpu(fe->permissions) &
1408                         (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1409                          FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1410                          FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1411         fe->permissions = cpu_to_le32(udfperms);
1412
1413         if (S_ISDIR(inode->i_mode))
1414                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1415         else
1416                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1417
1418         fe->informationLength = cpu_to_le64(inode->i_size);
1419
1420         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1421                 regid *eid;
1422                 struct deviceSpec *dsea =
1423                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1424                 if (!dsea) {
1425                         dsea = (struct deviceSpec *)
1426                                 udf_add_extendedattr(inode,
1427                                                      sizeof(struct deviceSpec) +
1428                                                      sizeof(regid), 12, 0x3);
1429                         dsea->attrType = cpu_to_le32(12);
1430                         dsea->attrSubtype = 1;
1431                         dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
1432                                                        sizeof(regid));
1433                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1434                 }
1435                 eid = (regid *)dsea->impUse;
1436                 memset(eid, 0, sizeof(regid));
1437                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1438                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1439                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1440                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1441                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1442         }
1443
1444         if (UDF_I_EFE(inode) == 0) {
1445                 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode),
1446                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1447                 fe->logicalBlocksRecorded = cpu_to_le64(
1448                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1449                         (inode->i_sb->s_blocksize_bits - 9));
1450
1451                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1452                         fe->accessTime = cpu_to_lets(cpu_time);
1453                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1454                         fe->modificationTime = cpu_to_lets(cpu_time);
1455                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1456                         fe->attrTime = cpu_to_lets(cpu_time);
1457                 memset(&(fe->impIdent), 0, sizeof(regid));
1458                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1459                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1460                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1461                 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1462                 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1463                 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1464                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1465                 crclen = sizeof(struct fileEntry);
1466         } else {
1467                 memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode),
1468                        inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1469                 efe->objectSize = cpu_to_le64(inode->i_size);
1470                 efe->logicalBlocksRecorded = cpu_to_le64(
1471                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1472                         (inode->i_sb->s_blocksize_bits - 9));
1473
1474                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
1475                     (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
1476                      UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec)) {
1477                         UDF_I_CRTIME(inode) = inode->i_atime;
1478                 }
1479                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
1480                     (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
1481                      UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec)) {
1482                         UDF_I_CRTIME(inode) = inode->i_mtime;
1483                 }
1484                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
1485                     (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
1486                      UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec)) {
1487                         UDF_I_CRTIME(inode) = inode->i_ctime;
1488                 }
1489
1490                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1491                         efe->accessTime = cpu_to_lets(cpu_time);
1492                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1493                         efe->modificationTime = cpu_to_lets(cpu_time);
1494                 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
1495                         efe->createTime = cpu_to_lets(cpu_time);
1496                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1497                         efe->attrTime = cpu_to_lets(cpu_time);
1498
1499                 memset(&(efe->impIdent), 0, sizeof(regid));
1500                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1501                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1502                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1503                 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1504                 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1505                 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1506                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1507                 crclen = sizeof(struct extendedFileEntry);
1508         }
1509         if (UDF_I_STRAT4096(inode)) {
1510                 fe->icbTag.strategyType = cpu_to_le16(4096);
1511                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1512                 fe->icbTag.numEntries = cpu_to_le16(2);
1513         } else {
1514                 fe->icbTag.strategyType = cpu_to_le16(4);
1515                 fe->icbTag.numEntries = cpu_to_le16(1);
1516         }
1517
1518         if (S_ISDIR(inode->i_mode))
1519                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1520         else if (S_ISREG(inode->i_mode))
1521                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1522         else if (S_ISLNK(inode->i_mode))
1523                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1524         else if (S_ISBLK(inode->i_mode))
1525                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1526         else if (S_ISCHR(inode->i_mode))
1527                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1528         else if (S_ISFIFO(inode->i_mode))
1529                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1530         else if (S_ISSOCK(inode->i_mode))
1531                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1532
1533         icbflags =      UDF_I_ALLOCTYPE(inode) |
1534                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1535                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1536                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1537                         (le16_to_cpu(fe->icbTag.flags) &
1538                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1539                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1540
1541         fe->icbTag.flags = cpu_to_le16(icbflags);
1542         if (sbi->s_udfrev >= 0x0200)
1543                 fe->descTag.descVersion = cpu_to_le16(3);
1544         else
1545                 fe->descTag.descVersion = cpu_to_le16(2);
1546         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1547         fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1548         crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
1549         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1550         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));
1551
1552         fe->descTag.tagChecksum = 0;
1553         for (i = 0; i < 16; i++) {
1554                 if (i != 4)
1555                         fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];
1556         }
1557
1558         /* write the data blocks */
1559         mark_buffer_dirty(bh);
1560         if (do_sync) {
1561                 sync_dirty_buffer(bh);
1562                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1563                         printk("IO error syncing udf inode [%s:%08lx]\n",
1564                                inode->i_sb->s_id, inode->i_ino);
1565                         err = -EIO;
1566                 }
1567         }
1568         brelse(bh);
1569
1570         return err;
1571 }
1572
1573 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1574 {
1575         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1576         struct inode *inode = iget_locked(sb, block);
1577
1578         if (!inode)
1579                 return NULL;
1580
1581         if (inode->i_state & I_NEW) {
1582                 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
1583                 __udf_read_inode(inode);
1584                 unlock_new_inode(inode);
1585         }
1586
1587         if (is_bad_inode(inode))
1588                 goto out_iput;
1589
1590         if (ino.logicalBlockNum >= UDF_SB(sb)->s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1591                 udf_debug("block=%d, partition=%d out of range\n",
1592                           ino.logicalBlockNum, ino.partitionReferenceNum);
1593                 make_bad_inode(inode);
1594                 goto out_iput;
1595         }
1596
1597         return inode;
1598
1599  out_iput:
1600         iput(inode);
1601         return NULL;
1602 }
1603
1604 int8_t udf_add_aext(struct inode * inode, struct extent_position * epos,
1605                     kernel_lb_addr eloc, uint32_t elen, int inc)
1606 {
1607         int adsize;
1608         short_ad *sad = NULL;
1609         long_ad *lad = NULL;
1610         struct allocExtDesc *aed;
1611         int8_t etype;
1612         uint8_t *ptr;
1613
1614         if (!epos->bh)
1615                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1616         else
1617                 ptr = epos->bh->b_data + epos->offset;
1618
1619         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1620                 adsize = sizeof(short_ad);
1621         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1622                 adsize = sizeof(long_ad);
1623         else
1624                 return -1;
1625
1626         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1627                 char *sptr, *dptr;
1628                 struct buffer_head *nbh;
1629                 int err, loffset;
1630                 kernel_lb_addr obloc = epos->block;
1631
1632                 if (!(epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1633                                                                   obloc.partitionReferenceNum,
1634                                                                   obloc.logicalBlockNum, &err))) {
1635                         return -1;
1636                 }
1637                 if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1638                                                                        epos->block, 0)))) {
1639                         return -1;
1640                 }
1641                 lock_buffer(nbh);
1642                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1643                 set_buffer_uptodate(nbh);
1644                 unlock_buffer(nbh);
1645                 mark_buffer_dirty_inode(nbh, inode);
1646
1647                 aed = (struct allocExtDesc *)(nbh->b_data);
1648                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1649                         aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
1650                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1651                         loffset = epos->offset;
1652                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1653                         sptr = ptr - adsize;
1654                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1655                         memcpy(dptr, sptr, adsize);
1656                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1657                 } else {
1658                         loffset = epos->offset + adsize;
1659                         aed->lengthAllocDescs = cpu_to_le32(0);
1660                         sptr = ptr;
1661                         epos->offset = sizeof(struct allocExtDesc);
1662
1663                         if (epos->bh) {
1664                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1665                                 aed->lengthAllocDescs =
1666                                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1667                         } else {
1668                                 UDF_I_LENALLOC(inode) += adsize;
1669                                 mark_inode_dirty(inode);
1670                         }
1671                 }
1672                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1673                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1674                                     epos->block.logicalBlockNum, sizeof(tag));
1675                 else
1676                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1677                                     epos->block.logicalBlockNum, sizeof(tag));
1678                 switch (UDF_I_ALLOCTYPE(inode)) {
1679                 case ICBTAG_FLAG_AD_SHORT:
1680                         sad = (short_ad *)sptr;
1681                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1682                                                      inode->i_sb->s_blocksize);
1683                         sad->extPosition = cpu_to_le32(epos->block.logicalBlockNum);
1684                         break;
1685                 case ICBTAG_FLAG_AD_LONG:
1686                         lad = (long_ad *)sptr;
1687                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1688                                                      inode->i_sb->s_blocksize);
1689                         lad->extLocation = cpu_to_lelb(epos->block);
1690                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1691                         break;
1692                 }
1693                 if (epos->bh) {
1694                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1695                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1696                                 udf_update_tag(epos->bh->b_data, loffset);
1697                         else
1698                                 udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
1699                         mark_buffer_dirty_inode(epos->bh, inode);
1700                         brelse(epos->bh);
1701                 } else {
1702                         mark_inode_dirty(inode);
1703                 }
1704                 epos->bh = nbh;
1705         }
1706
1707         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1708
1709         if (!epos->bh) {
1710                 UDF_I_LENALLOC(inode) += adsize;
1711                 mark_inode_dirty(inode);
1712         } else {
1713                 aed = (struct allocExtDesc *)epos->bh->b_data;
1714                 aed->lengthAllocDescs =
1715                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1716                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1717                         udf_update_tag(epos->bh->b_data, epos->offset + (inc ? 0 : adsize));
1718                 else
1719                         udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
1720                 mark_buffer_dirty_inode(epos->bh, inode);
1721         }
1722
1723         return etype;
1724 }
1725
1726 int8_t udf_write_aext(struct inode * inode, struct extent_position * epos,
1727                       kernel_lb_addr eloc, uint32_t elen, int inc)
1728 {
1729         int adsize;
1730         uint8_t *ptr;
1731         short_ad *sad;
1732         long_ad *lad;
1733
1734         if (!epos->bh)
1735                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1736         else
1737                 ptr = epos->bh->b_data + epos->offset;
1738
1739         switch (UDF_I_ALLOCTYPE(inode)) {
1740         case ICBTAG_FLAG_AD_SHORT:
1741                 sad = (short_ad *)ptr;
1742                 sad->extLength = cpu_to_le32(elen);
1743                 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1744                 adsize = sizeof(short_ad);
1745                 break;
1746         case ICBTAG_FLAG_AD_LONG:
1747                 lad = (long_ad *)ptr;
1748                 lad->extLength = cpu_to_le32(elen);
1749                 lad->extLocation = cpu_to_lelb(eloc);
1750                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1751                 adsize = sizeof(long_ad);
1752                 break;
1753         default:
1754                 return -1;
1755         }
1756
1757         if (epos->bh) {
1758                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1759                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1760                         struct allocExtDesc *aed = (struct allocExtDesc *)epos->bh->b_data;
1761                         udf_update_tag(epos->bh->b_data,
1762                                        le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc));
1763                 }
1764                 mark_buffer_dirty_inode(epos->bh, inode);
1765         } else {
1766                 mark_inode_dirty(inode);
1767         }
1768
1769         if (inc)
1770                 epos->offset += adsize;
1771
1772         return (elen >> 30);
1773 }
1774
1775 int8_t udf_next_aext(struct inode * inode, struct extent_position * epos,
1776                      kernel_lb_addr * eloc, uint32_t * elen, int inc)
1777 {
1778         int8_t etype;
1779
1780         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1781                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1782                 epos->block = *eloc;
1783                 epos->offset = sizeof(struct allocExtDesc);
1784                 brelse(epos->bh);
1785                 if (!(epos->bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, epos->block, 0)))) {
1786                         udf_debug("reading block %d failed!\n",
1787                                   udf_get_lb_pblock(inode->i_sb, epos->block, 0));
1788                         return -1;
1789                 }
1790         }
1791
1792         return etype;
1793 }
1794
1795 int8_t udf_current_aext(struct inode * inode, struct extent_position * epos,
1796                         kernel_lb_addr * eloc, uint32_t * elen, int inc)
1797 {
1798         int alen;
1799         int8_t etype;
1800         uint8_t *ptr;
1801         short_ad *sad;
1802         long_ad *lad;
1803
1804
1805         if (!epos->bh) {
1806                 if (!epos->offset)
1807                         epos->offset = udf_file_entry_alloc_offset(inode);
1808                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1809                 alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode);
1810         } else {
1811                 if (!epos->offset)
1812                         epos->offset = sizeof(struct allocExtDesc);
1813                 ptr = epos->bh->b_data + epos->offset;
1814                 alen = sizeof(struct allocExtDesc) +
1815                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->lengthAllocDescs);
1816         }
1817
1818         switch (UDF_I_ALLOCTYPE(inode)) {
1819         case ICBTAG_FLAG_AD_SHORT:
1820                 if (!(sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc)))
1821                         return -1;
1822                 etype = le32_to_cpu(sad->extLength) >> 30;
1823                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1824                 eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
1825                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1826                 break;
1827         case ICBTAG_FLAG_AD_LONG:
1828                 if (!(lad = udf_get_filelongad(ptr, alen, &epos->offset, inc)))
1829                         return -1;
1830                 etype = le32_to_cpu(lad->extLength) >> 30;
1831                 *eloc = lelb_to_cpu(lad->extLocation);
1832                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1833                 break;
1834         default:
1835                 udf_debug("alloc_type = %d unsupported\n", UDF_I_ALLOCTYPE(inode));
1836                 return -1;
1837         }
1838
1839         return etype;
1840 }
1841
1842 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1843                               kernel_lb_addr neloc, uint32_t nelen)
1844 {
1845         kernel_lb_addr oeloc;
1846         uint32_t oelen;
1847         int8_t etype;
1848
1849         if (epos.bh)
1850                 get_bh(epos.bh);
1851
1852         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1853                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1854                 neloc = oeloc;
1855                 nelen = (etype << 30) | oelen;
1856         }
1857         udf_add_aext(inode, &epos, neloc, nelen, 1);
1858         brelse(epos.bh);
1859
1860         return (nelen >> 30);
1861 }
1862
1863 int8_t udf_delete_aext(struct inode * inode, struct extent_position epos,
1864                        kernel_lb_addr eloc, uint32_t elen)
1865 {
1866         struct extent_position oepos;
1867         int adsize;
1868         int8_t etype;
1869         struct allocExtDesc *aed;
1870
1871         if (epos.bh) {
1872                 get_bh(epos.bh);
1873                 get_bh(epos.bh);
1874         }
1875
1876         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1877                 adsize = sizeof(short_ad);
1878         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1879                 adsize = sizeof(long_ad);
1880         else
1881                 adsize = 0;
1882
1883         oepos = epos;
1884         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1885                 return -1;
1886
1887         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1888                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1889                 if (oepos.bh != epos.bh) {
1890                         oepos.block = epos.block;
1891                         brelse(oepos.bh);
1892                         get_bh(epos.bh);
1893                         oepos.bh = epos.bh;
1894                         oepos.offset = epos.offset - adsize;
1895                 }
1896         }
1897         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1898         elen = 0;
1899
1900         if (epos.bh != oepos.bh) {
1901                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
1902                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1903                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1904                 if (!oepos.bh) {
1905                         UDF_I_LENALLOC(inode) -= (adsize * 2);
1906                         mark_inode_dirty(inode);
1907                 } else {
1908                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1909                         aed->lengthAllocDescs =
1910                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2 * adsize));
1911                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1912                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1913                                 udf_update_tag(oepos.bh->b_data, oepos.offset - (2 * adsize));
1914                         else
1915                                 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
1916                         mark_buffer_dirty_inode(oepos.bh, inode);
1917                 }
1918         } else {
1919                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1920                 if (!oepos.bh) {
1921                         UDF_I_LENALLOC(inode) -= adsize;
1922                         mark_inode_dirty(inode);
1923                 } else {
1924                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1925                         aed->lengthAllocDescs =
1926                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize);
1927                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1928                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1929                                 udf_update_tag(oepos.bh->b_data, epos.offset - adsize);
1930                         else
1931                                 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
1932                         mark_buffer_dirty_inode(oepos.bh, inode);
1933                 }
1934         }
1935
1936         brelse(epos.bh);
1937         brelse(oepos.bh);
1938
1939         return (elen >> 30);
1940 }
1941
1942 int8_t inode_bmap(struct inode * inode, sector_t block,
1943                   struct extent_position * pos, kernel_lb_addr * eloc,
1944                   uint32_t * elen, sector_t * offset)
1945 {
1946         loff_t lbcount = 0, bcount =
1947             (loff_t) block << inode->i_sb->s_blocksize_bits;
1948         int8_t etype;
1949
1950         if (block < 0) {
1951                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
1952                 return -1;
1953         }
1954
1955         pos->offset = 0;
1956         pos->block = UDF_I_LOCATION(inode);
1957         pos->bh = NULL;
1958         *elen = 0;
1959
1960         do {
1961                 if ((etype = udf_next_aext(inode, pos, eloc, elen, 1)) == -1) {
1962                         *offset = (bcount - lbcount) >> inode->i_sb->s_blocksize_bits;
1963                         UDF_I_LENEXTENTS(inode) = lbcount;
1964                         return -1;
1965                 }
1966                 lbcount += *elen;
1967         } while (lbcount <= bcount);
1968
1969         *offset = (bcount + *elen - lbcount) >> inode->i_sb->s_blocksize_bits;
1970
1971         return etype;
1972 }
1973
1974 long udf_block_map(struct inode *inode, sector_t block)
1975 {
1976         kernel_lb_addr eloc;
1977         uint32_t elen;
1978         sector_t offset;
1979         struct extent_position epos = {};
1980         int ret;
1981
1982         lock_kernel();
1983
1984         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
1985                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
1986         else
1987                 ret = 0;
1988
1989         unlock_kernel();
1990         brelse(epos.bh);
1991
1992         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
1993                 return udf_fixed_to_variable(ret);
1994         else
1995                 return ret;
1996 }