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   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
1085         fe = (struct fileEntry *)bh->b_data;
1086         efe = (struct extendedFileEntry *)bh->b_data;
1087
1088         if (le16_to_cpu(fe->icbTag.strategyType) == 4)
1089                 UDF_I_STRAT4096(inode) = 0;
1090         else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
1091                 UDF_I_STRAT4096(inode) = 1;
1092
1093         UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
1094         UDF_I_UNIQUE(inode) = 0;
1095         UDF_I_LENEATTR(inode) = 0;
1096         UDF_I_LENEXTENTS(inode) = 0;
1097         UDF_I_LENALLOC(inode) = 0;
1098         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
1099         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
1100         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE) {
1101                 UDF_I_EFE(inode) = 1;
1102                 UDF_I_USE(inode) = 0;
1103                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry))) {
1104                         make_bad_inode(inode);
1105                         return;
1106                 }
1107                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry),
1108                        inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1109         } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE) {
1110                 UDF_I_EFE(inode) = 0;
1111                 UDF_I_USE(inode) = 0;
1112                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct fileEntry))) {
1113                         make_bad_inode(inode);
1114                         return;
1115                 }
1116                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry),
1117                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1118         } else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) {
1119                 UDF_I_EFE(inode) = 0;
1120                 UDF_I_USE(inode) = 1;
1121                 UDF_I_LENALLOC(inode) =
1122                     le32_to_cpu(((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
1123                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry))) {
1124                         make_bad_inode(inode);
1125                         return;
1126                 }
1127                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry),
1128                        inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1129                 return;
1130         }
1131
1132         inode->i_uid = le32_to_cpu(fe->uid);
1133         if (inode->i_uid == -1 ||
1134             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1135             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1136                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1137
1138         inode->i_gid = le32_to_cpu(fe->gid);
1139         if (inode->i_gid == -1 ||
1140             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1141             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1142                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1143
1144         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1145         if (!inode->i_nlink)
1146                 inode->i_nlink = 1;
1147
1148         inode->i_size = le64_to_cpu(fe->informationLength);
1149         UDF_I_LENEXTENTS(inode) = inode->i_size;
1150
1151         inode->i_mode = udf_convert_permissions(fe);
1152         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1153
1154         if (UDF_I_EFE(inode) == 0) {
1155                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1156                         (inode->i_sb->s_blocksize_bits - 9);
1157
1158                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1159                                       lets_to_cpu(fe->accessTime))) {
1160                         inode->i_atime.tv_sec = convtime;
1161                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1162                 } else {
1163                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1164                 }
1165
1166                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1167                                       lets_to_cpu(fe->modificationTime))) {
1168                         inode->i_mtime.tv_sec = convtime;
1169                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1170                 } else {
1171                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1172                 }
1173
1174                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1175                                       lets_to_cpu(fe->attrTime))) {
1176                         inode->i_ctime.tv_sec = convtime;
1177                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1178                 } else {
1179                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1180                 }
1181
1182                 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
1183                 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
1184                 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
1185                 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
1186         } else {
1187                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1188                     (inode->i_sb->s_blocksize_bits - 9);
1189
1190                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1191                                       lets_to_cpu(efe->accessTime))) {
1192                         inode->i_atime.tv_sec = convtime;
1193                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1194                 } else {
1195                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1196                 }
1197
1198                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1199                                       lets_to_cpu(efe->modificationTime))) {
1200                         inode->i_mtime.tv_sec = convtime;
1201                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1202                 } else {
1203                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1204                 }
1205
1206                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1207                                       lets_to_cpu(efe->createTime))) {
1208                         UDF_I_CRTIME(inode).tv_sec = convtime;
1209                         UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
1210                 } else {
1211                         UDF_I_CRTIME(inode) = UDF_SB_RECORDTIME(inode->i_sb);
1212                 }
1213
1214                 if (udf_stamp_to_time(&convtime, &convtime_usec,
1215                                       lets_to_cpu(efe->attrTime))) {
1216                         inode->i_ctime.tv_sec = convtime;
1217                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1218                 } else {
1219                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1220                 }
1221
1222                 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
1223                 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
1224                 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
1225                 offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
1226         }
1227
1228         switch (fe->icbTag.fileType) {
1229         case ICBTAG_FILE_TYPE_DIRECTORY:
1230                 inode->i_op = &udf_dir_inode_operations;
1231                 inode->i_fop = &udf_dir_operations;
1232                 inode->i_mode |= S_IFDIR;
1233                 inc_nlink(inode);
1234                 break;
1235         case ICBTAG_FILE_TYPE_REALTIME:
1236         case ICBTAG_FILE_TYPE_REGULAR:
1237         case ICBTAG_FILE_TYPE_UNDEF:
1238                 if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1239                         inode->i_data.a_ops = &udf_adinicb_aops;
1240                 else
1241                         inode->i_data.a_ops = &udf_aops;
1242                 inode->i_op = &udf_file_inode_operations;
1243                 inode->i_fop = &udf_file_operations;
1244                 inode->i_mode |= S_IFREG;
1245                 break;
1246         case ICBTAG_FILE_TYPE_BLOCK:
1247                 inode->i_mode |= S_IFBLK;
1248                 break;
1249         case ICBTAG_FILE_TYPE_CHAR:
1250                 inode->i_mode |= S_IFCHR;
1251                 break;
1252         case ICBTAG_FILE_TYPE_FIFO:
1253                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1254                 break;
1255         case ICBTAG_FILE_TYPE_SOCKET:
1256                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1257                 break;
1258         case ICBTAG_FILE_TYPE_SYMLINK:
1259                 inode->i_data.a_ops = &udf_symlink_aops;
1260                 inode->i_op = &page_symlink_inode_operations;
1261                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1262                 break;
1263         default:
1264                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
1265                        inode->i_ino, fe->icbTag.fileType);
1266                 make_bad_inode(inode);
1267                 return;
1268         }
1269         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1270                 struct deviceSpec *dsea = (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1271                 if (dsea) {
1272                         init_special_inode(inode, inode->i_mode,
1273                                            MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1274                                                  le32_to_cpu(dsea->minorDeviceIdent)));
1275                         /* Developer ID ??? */
1276                 } else {
1277                         make_bad_inode(inode);
1278                 }
1279         }
1280 }
1281
1282 static int udf_alloc_i_data(struct inode *inode, size_t size)
1283 {
1284         UDF_I_DATA(inode) = kmalloc(size, GFP_KERNEL);
1285
1286         if (!UDF_I_DATA(inode)) {
1287                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) no free memory\n",
1288                        inode->i_ino);
1289                 return -ENOMEM;
1290         }
1291
1292         return 0;
1293 }
1294
1295 static mode_t udf_convert_permissions(struct fileEntry *fe)
1296 {
1297         mode_t mode;
1298         uint32_t permissions;
1299         uint32_t flags;
1300
1301         permissions = le32_to_cpu(fe->permissions);
1302         flags = le16_to_cpu(fe->icbTag.flags);
1303
1304         mode =  (( permissions      ) & S_IRWXO) |
1305                 (( permissions >> 2 ) & S_IRWXG) |
1306                 (( permissions >> 4 ) & S_IRWXU) |
1307                 (( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1308                 (( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1309                 (( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1310
1311         return mode;
1312 }
1313
1314 /*
1315  * udf_write_inode
1316  *
1317  * PURPOSE
1318  *      Write out the specified inode.
1319  *
1320  * DESCRIPTION
1321  *      This routine is called whenever an inode is synced.
1322  *      Currently this routine is just a placeholder.
1323  *
1324  * HISTORY
1325  *      July 1, 1997 - Andrew E. Mileski
1326  *      Written, tested, and released.
1327  */
1328
1329 int udf_write_inode(struct inode *inode, int sync)
1330 {
1331         int ret;
1332
1333         lock_kernel();
1334         ret = udf_update_inode(inode, sync);
1335         unlock_kernel();
1336
1337         return ret;
1338 }
1339
1340 int udf_sync_inode(struct inode *inode)
1341 {
1342         return udf_update_inode(inode, 1);
1343 }
1344
1345 static int udf_update_inode(struct inode *inode, int do_sync)
1346 {
1347         struct buffer_head *bh = NULL;
1348         struct fileEntry *fe;
1349         struct extendedFileEntry *efe;
1350         uint32_t udfperms;
1351         uint16_t icbflags;
1352         uint16_t crclen;
1353         int i;
1354         kernel_timestamp cpu_time;
1355         int err = 0;
1356
1357         bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));
1358         if (!bh) {
1359                 udf_debug("bread failure\n");
1360                 return -EIO;
1361         }
1362
1363         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1364
1365         fe = (struct fileEntry *)bh->b_data;
1366         efe = (struct extendedFileEntry *)bh->b_data;
1367
1368         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE) {
1369                 struct unallocSpaceEntry *use =
1370                         (struct unallocSpaceEntry *)bh->b_data;
1371
1372                 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1373                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode),
1374                        inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1375                 crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) - sizeof(tag);
1376                 use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1377                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1378                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));
1379
1380                 use->descTag.tagChecksum = 0;
1381                 for (i = 0; i < 16; i++) {
1382                         if (i != 4)
1383                                 use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];
1384                 }
1385
1386                 mark_buffer_dirty(bh);
1387                 brelse(bh);
1388                 return err;
1389         }
1390
1391         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1392                 fe->uid = cpu_to_le32(-1);
1393         else
1394                 fe->uid = cpu_to_le32(inode->i_uid);
1395
1396         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1397                 fe->gid = cpu_to_le32(-1);
1398         else
1399                 fe->gid = cpu_to_le32(inode->i_gid);
1400
1401         udfperms =      ((inode->i_mode & S_IRWXO)     ) |
1402                         ((inode->i_mode & S_IRWXG) << 2) |
1403                         ((inode->i_mode & S_IRWXU) << 4);
1404
1405         udfperms |=     (le32_to_cpu(fe->permissions) &
1406                         (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1407                          FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1408                          FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1409         fe->permissions = cpu_to_le32(udfperms);
1410
1411         if (S_ISDIR(inode->i_mode))
1412                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1413         else
1414                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1415
1416         fe->informationLength = cpu_to_le64(inode->i_size);
1417
1418         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1419                 regid *eid;
1420                 struct deviceSpec *dsea =
1421                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1422                 if (!dsea) {
1423                         dsea = (struct deviceSpec *)
1424                                 udf_add_extendedattr(inode,
1425                                                      sizeof(struct deviceSpec) +
1426                                                      sizeof(regid), 12, 0x3);
1427                         dsea->attrType = cpu_to_le32(12);
1428                         dsea->attrSubtype = 1;
1429                         dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
1430                                                        sizeof(regid));
1431                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1432                 }
1433                 eid = (regid *)dsea->impUse;
1434                 memset(eid, 0, sizeof(regid));
1435                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1436                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1437                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1438                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1439                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1440         }
1441
1442         if (UDF_I_EFE(inode) == 0) {
1443                 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode),
1444                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1445                 fe->logicalBlocksRecorded = cpu_to_le64(
1446                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1447                         (inode->i_sb->s_blocksize_bits - 9));
1448
1449                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1450                         fe->accessTime = cpu_to_lets(cpu_time);
1451                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1452                         fe->modificationTime = cpu_to_lets(cpu_time);
1453                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1454                         fe->attrTime = cpu_to_lets(cpu_time);
1455                 memset(&(fe->impIdent), 0, sizeof(regid));
1456                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1457                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1458                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1459                 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1460                 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1461                 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1462                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1463                 crclen = sizeof(struct fileEntry);
1464         } else {
1465                 memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode),
1466                        inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1467                 efe->objectSize = cpu_to_le64(inode->i_size);
1468                 efe->logicalBlocksRecorded = cpu_to_le64(
1469                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1470                         (inode->i_sb->s_blocksize_bits - 9));
1471
1472                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
1473                     (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
1474                      UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec)) {
1475                         UDF_I_CRTIME(inode) = inode->i_atime;
1476                 }
1477                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
1478                     (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
1479                      UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec)) {
1480                         UDF_I_CRTIME(inode) = inode->i_mtime;
1481                 }
1482                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
1483                     (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
1484                      UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec)) {
1485                         UDF_I_CRTIME(inode) = inode->i_ctime;
1486                 }
1487
1488                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1489                         efe->accessTime = cpu_to_lets(cpu_time);
1490                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1491                         efe->modificationTime = cpu_to_lets(cpu_time);
1492                 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
1493                         efe->createTime = cpu_to_lets(cpu_time);
1494                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1495                         efe->attrTime = cpu_to_lets(cpu_time);
1496
1497                 memset(&(efe->impIdent), 0, sizeof(regid));
1498                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1499                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1500                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1501                 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1502                 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1503                 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1504                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1505                 crclen = sizeof(struct extendedFileEntry);
1506         }
1507         if (UDF_I_STRAT4096(inode)) {
1508                 fe->icbTag.strategyType = cpu_to_le16(4096);
1509                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1510                 fe->icbTag.numEntries = cpu_to_le16(2);
1511         } else {
1512                 fe->icbTag.strategyType = cpu_to_le16(4);
1513                 fe->icbTag.numEntries = cpu_to_le16(1);
1514         }
1515
1516         if (S_ISDIR(inode->i_mode))
1517                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1518         else if (S_ISREG(inode->i_mode))
1519                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1520         else if (S_ISLNK(inode->i_mode))
1521                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1522         else if (S_ISBLK(inode->i_mode))
1523                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1524         else if (S_ISCHR(inode->i_mode))
1525                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1526         else if (S_ISFIFO(inode->i_mode))
1527                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1528         else if (S_ISSOCK(inode->i_mode))
1529                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1530
1531         icbflags =      UDF_I_ALLOCTYPE(inode) |
1532                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1533                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1534                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1535                         (le16_to_cpu(fe->icbTag.flags) &
1536                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1537                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1538
1539         fe->icbTag.flags = cpu_to_le16(icbflags);
1540         if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1541                 fe->descTag.descVersion = cpu_to_le16(3);
1542         else
1543                 fe->descTag.descVersion = cpu_to_le16(2);
1544         fe->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
1545         fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1546         crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
1547         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1548         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));
1549
1550         fe->descTag.tagChecksum = 0;
1551         for (i = 0; i < 16; i++) {
1552                 if (i != 4)
1553                         fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];
1554         }
1555
1556         /* write the data blocks */
1557         mark_buffer_dirty(bh);
1558         if (do_sync) {
1559                 sync_dirty_buffer(bh);
1560                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1561                         printk("IO error syncing udf inode [%s:%08lx]\n",
1562                                inode->i_sb->s_id, inode->i_ino);
1563                         err = -EIO;
1564                 }
1565         }
1566         brelse(bh);
1567
1568         return err;
1569 }
1570
1571 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1572 {
1573         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1574         struct inode *inode = iget_locked(sb, block);
1575
1576         if (!inode)
1577                 return NULL;
1578
1579         if (inode->i_state & I_NEW) {
1580                 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
1581                 __udf_read_inode(inode);
1582                 unlock_new_inode(inode);
1583         }
1584
1585         if (is_bad_inode(inode))
1586                 goto out_iput;
1587
1588         if (ino.logicalBlockNum >= UDF_SB_PARTLEN(sb, ino.partitionReferenceNum)) {
1589                 udf_debug("block=%d, partition=%d out of range\n",
1590                           ino.logicalBlockNum, ino.partitionReferenceNum);
1591                 make_bad_inode(inode);
1592                 goto out_iput;
1593         }
1594
1595         return inode;
1596
1597  out_iput:
1598         iput(inode);
1599         return NULL;
1600 }
1601
1602 int8_t udf_add_aext(struct inode * inode, struct extent_position * epos,
1603                     kernel_lb_addr eloc, uint32_t elen, int inc)
1604 {
1605         int adsize;
1606         short_ad *sad = NULL;
1607         long_ad *lad = NULL;
1608         struct allocExtDesc *aed;
1609         int8_t etype;
1610         uint8_t *ptr;
1611
1612         if (!epos->bh)
1613                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1614         else
1615                 ptr = epos->bh->b_data + epos->offset;
1616
1617         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1618                 adsize = sizeof(short_ad);
1619         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1620                 adsize = sizeof(long_ad);
1621         else
1622                 return -1;
1623
1624         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1625                 char *sptr, *dptr;
1626                 struct buffer_head *nbh;
1627                 int err, loffset;
1628                 kernel_lb_addr obloc = epos->block;
1629
1630                 if (!(epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1631                                                                   obloc.partitionReferenceNum,
1632                                                                   obloc.logicalBlockNum, &err))) {
1633                         return -1;
1634                 }
1635                 if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1636                                                                        epos->block, 0)))) {
1637                         return -1;
1638                 }
1639                 lock_buffer(nbh);
1640                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1641                 set_buffer_uptodate(nbh);
1642                 unlock_buffer(nbh);
1643                 mark_buffer_dirty_inode(nbh, inode);
1644
1645                 aed = (struct allocExtDesc *)(nbh->b_data);
1646                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1647                         aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
1648                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1649                         loffset = epos->offset;
1650                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1651                         sptr = ptr - adsize;
1652                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1653                         memcpy(dptr, sptr, adsize);
1654                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1655                 } else {
1656                         loffset = epos->offset + adsize;
1657                         aed->lengthAllocDescs = cpu_to_le32(0);
1658                         sptr = ptr;
1659                         epos->offset = sizeof(struct allocExtDesc);
1660
1661                         if (epos->bh) {
1662                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1663                                 aed->lengthAllocDescs =
1664                                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1665                         } else {
1666                                 UDF_I_LENALLOC(inode) += adsize;
1667                                 mark_inode_dirty(inode);
1668                         }
1669                 }
1670                 if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1671                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1672                                     epos->block.logicalBlockNum, sizeof(tag));
1673                 else
1674                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1675                                     epos->block.logicalBlockNum, sizeof(tag));
1676                 switch (UDF_I_ALLOCTYPE(inode)) {
1677                 case ICBTAG_FLAG_AD_SHORT:
1678                         sad = (short_ad *)sptr;
1679                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1680                                                      inode->i_sb->s_blocksize);
1681                         sad->extPosition = cpu_to_le32(epos->block.logicalBlockNum);
1682                         break;
1683                 case ICBTAG_FLAG_AD_LONG:
1684                         lad = (long_ad *)sptr;
1685                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1686                                                      inode->i_sb->s_blocksize);
1687                         lad->extLocation = cpu_to_lelb(epos->block);
1688                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1689                         break;
1690                 }
1691                 if (epos->bh) {
1692                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1693                             UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1694                                 udf_update_tag(epos->bh->b_data, loffset);
1695                         else
1696                                 udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
1697                         mark_buffer_dirty_inode(epos->bh, inode);
1698                         brelse(epos->bh);
1699                 } else {
1700                         mark_inode_dirty(inode);
1701                 }
1702                 epos->bh = nbh;
1703         }
1704
1705         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1706
1707         if (!epos->bh) {
1708                 UDF_I_LENALLOC(inode) += adsize;
1709                 mark_inode_dirty(inode);
1710         } else {
1711                 aed = (struct allocExtDesc *)epos->bh->b_data;
1712                 aed->lengthAllocDescs =
1713                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1714                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1715                         udf_update_tag(epos->bh->b_data, epos->offset + (inc ? 0 : adsize));
1716                 else
1717                         udf_update_tag(epos->bh->b_data, sizeof(struct allocExtDesc));
1718                 mark_buffer_dirty_inode(epos->bh, inode);
1719         }
1720
1721         return etype;
1722 }
1723
1724 int8_t udf_write_aext(struct inode * inode, struct extent_position * epos,
1725                       kernel_lb_addr eloc, uint32_t elen, int inc)
1726 {
1727         int adsize;
1728         uint8_t *ptr;
1729         short_ad *sad;
1730         long_ad *lad;
1731
1732         if (!epos->bh)
1733                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1734         else
1735                 ptr = epos->bh->b_data + epos->offset;
1736
1737         switch (UDF_I_ALLOCTYPE(inode)) {
1738         case ICBTAG_FLAG_AD_SHORT:
1739                 sad = (short_ad *)ptr;
1740                 sad->extLength = cpu_to_le32(elen);
1741                 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1742                 adsize = sizeof(short_ad);
1743                 break;
1744         case ICBTAG_FLAG_AD_LONG:
1745                 lad = (long_ad *)ptr;
1746                 lad->extLength = cpu_to_le32(elen);
1747                 lad->extLocation = cpu_to_lelb(eloc);
1748                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1749                 adsize = sizeof(long_ad);
1750                 break;
1751         default:
1752                 return -1;
1753         }
1754
1755         if (epos->bh) {
1756                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1757                     UDF_SB_UDFREV(inode->i_sb) >= 0x0201) {
1758                         struct allocExtDesc *aed = (struct allocExtDesc *)epos->bh->b_data;
1759                         udf_update_tag(epos->bh->b_data,
1760                                        le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc));
1761                 }
1762                 mark_buffer_dirty_inode(epos->bh, inode);
1763         } else {
1764                 mark_inode_dirty(inode);
1765         }
1766
1767         if (inc)
1768                 epos->offset += adsize;
1769
1770         return (elen >> 30);
1771 }
1772
1773 int8_t udf_next_aext(struct inode * inode, struct extent_position * epos,
1774                      kernel_lb_addr * eloc, uint32_t * elen, int inc)
1775 {
1776         int8_t etype;
1777
1778         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1779                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1780                 epos->block = *eloc;
1781                 epos->offset = sizeof(struct allocExtDesc);
1782                 brelse(epos->bh);
1783                 if (!(epos->bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, epos->block, 0)))) {
1784                         udf_debug("reading block %d failed!\n",
1785                                   udf_get_lb_pblock(inode->i_sb, epos->block, 0));
1786                         return -1;
1787                 }
1788         }
1789
1790         return etype;
1791 }
1792
1793 int8_t udf_current_aext(struct inode * inode, struct extent_position * epos,
1794                         kernel_lb_addr * eloc, uint32_t * elen, int inc)
1795 {
1796         int alen;
1797         int8_t etype;
1798         uint8_t *ptr;
1799         short_ad *sad;
1800         long_ad *lad;
1801
1802
1803         if (!epos->bh) {
1804                 if (!epos->offset)
1805                         epos->offset = udf_file_entry_alloc_offset(inode);
1806                 ptr = UDF_I_DATA(inode) + epos->offset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1807                 alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode);
1808         } else {
1809                 if (!epos->offset)
1810                         epos->offset = sizeof(struct allocExtDesc);
1811                 ptr = epos->bh->b_data + epos->offset;
1812                 alen = sizeof(struct allocExtDesc) +
1813                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->lengthAllocDescs);
1814         }
1815
1816         switch (UDF_I_ALLOCTYPE(inode)) {
1817         case ICBTAG_FLAG_AD_SHORT:
1818                 if (!(sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc)))
1819                         return -1;
1820                 etype = le32_to_cpu(sad->extLength) >> 30;
1821                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1822                 eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
1823                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1824                 break;
1825         case ICBTAG_FLAG_AD_LONG:
1826                 if (!(lad = udf_get_filelongad(ptr, alen, &epos->offset, inc)))
1827                         return -1;
1828                 etype = le32_to_cpu(lad->extLength) >> 30;
1829                 *eloc = lelb_to_cpu(lad->extLocation);
1830                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1831                 break;
1832         default:
1833                 udf_debug("alloc_type = %d unsupported\n", UDF_I_ALLOCTYPE(inode));
1834                 return -1;
1835         }
1836
1837         return etype;
1838 }
1839
1840 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1841                               kernel_lb_addr neloc, uint32_t nelen)
1842 {
1843         kernel_lb_addr oeloc;
1844         uint32_t oelen;
1845         int8_t etype;
1846
1847         if (epos.bh)
1848                 get_bh(epos.bh);
1849
1850         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1851                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1852                 neloc = oeloc;
1853                 nelen = (etype << 30) | oelen;
1854         }
1855         udf_add_aext(inode, &epos, neloc, nelen, 1);
1856         brelse(epos.bh);
1857
1858         return (nelen >> 30);
1859 }
1860
1861 int8_t udf_delete_aext(struct inode * inode, struct extent_position epos,
1862                        kernel_lb_addr eloc, uint32_t elen)
1863 {
1864         struct extent_position oepos;
1865         int adsize;
1866         int8_t etype;
1867         struct allocExtDesc *aed;
1868
1869         if (epos.bh) {
1870                 get_bh(epos.bh);
1871                 get_bh(epos.bh);
1872         }
1873
1874         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1875                 adsize = sizeof(short_ad);
1876         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1877                 adsize = sizeof(long_ad);
1878         else
1879                 adsize = 0;
1880
1881         oepos = epos;
1882         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1883                 return -1;
1884
1885         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1886                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1887                 if (oepos.bh != epos.bh) {
1888                         oepos.block = epos.block;
1889                         brelse(oepos.bh);
1890                         get_bh(epos.bh);
1891                         oepos.bh = epos.bh;
1892                         oepos.offset = epos.offset - adsize;
1893                 }
1894         }
1895         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1896         elen = 0;
1897
1898         if (epos.bh != oepos.bh) {
1899                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
1900                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1901                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1902                 if (!oepos.bh) {
1903                         UDF_I_LENALLOC(inode) -= (adsize * 2);
1904                         mark_inode_dirty(inode);
1905                 } else {
1906                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1907                         aed->lengthAllocDescs =
1908                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2 * adsize));
1909                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1910                             UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1911                                 udf_update_tag(oepos.bh->b_data, oepos.offset - (2 * adsize));
1912                         else
1913                                 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
1914                         mark_buffer_dirty_inode(oepos.bh, inode);
1915                 }
1916         } else {
1917                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1918                 if (!oepos.bh) {
1919                         UDF_I_LENALLOC(inode) -= adsize;
1920                         mark_inode_dirty(inode);
1921                 } else {
1922                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1923                         aed->lengthAllocDescs =
1924                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize);
1925                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1926                             UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1927                                 udf_update_tag(oepos.bh->b_data, epos.offset - adsize);
1928                         else
1929                                 udf_update_tag(oepos.bh->b_data, sizeof(struct allocExtDesc));
1930                         mark_buffer_dirty_inode(oepos.bh, inode);
1931                 }
1932         }
1933
1934         brelse(epos.bh);
1935         brelse(oepos.bh);
1936
1937         return (elen >> 30);
1938 }
1939
1940 int8_t inode_bmap(struct inode * inode, sector_t block,
1941                   struct extent_position * pos, kernel_lb_addr * eloc,
1942                   uint32_t * elen, sector_t * offset)
1943 {
1944         loff_t lbcount = 0, bcount =
1945             (loff_t) block << inode->i_sb->s_blocksize_bits;
1946         int8_t etype;
1947
1948         if (block < 0) {
1949                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
1950                 return -1;
1951         }
1952
1953         pos->offset = 0;
1954         pos->block = UDF_I_LOCATION(inode);
1955         pos->bh = NULL;
1956         *elen = 0;
1957
1958         do {
1959                 if ((etype = udf_next_aext(inode, pos, eloc, elen, 1)) == -1) {
1960                         *offset = (bcount - lbcount) >> inode->i_sb->s_blocksize_bits;
1961                         UDF_I_LENEXTENTS(inode) = lbcount;
1962                         return -1;
1963                 }
1964                 lbcount += *elen;
1965         } while (lbcount <= bcount);
1966
1967         *offset = (bcount + *elen - lbcount) >> inode->i_sb->s_blocksize_bits;
1968
1969         return etype;
1970 }
1971
1972 long udf_block_map(struct inode *inode, sector_t block)
1973 {
1974         kernel_lb_addr eloc;
1975         uint32_t elen;
1976         sector_t offset;
1977         struct extent_position epos = {};
1978         int ret;
1979
1980         lock_kernel();
1981
1982         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
1983                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
1984         else
1985                 ret = 0;
1986
1987         unlock_kernel();
1988         brelse(epos.bh);
1989
1990         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
1991                 return udf_fixed_to_variable(ret);
1992         else
1993                 return ret;
1994 }