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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
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/module.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/buffer_head.h>
  38 #include <linux/writeback.h>
  39 #include <linux/slab.h>
  40
  41 #include "udf_i.h"
  42 #include "udf_sb.h"
  43
  44 MODULE_AUTHOR("Ben Fennema");
  45 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  46 MODULE_LICENSE("GPL");
  47
  48 #define EXTENT_MERGE_SIZE 5
  49
  50 static mode_t udf_convert_permissions(struct fileEntry *);
  51 static int udf_update_inode(struct inode *, int);
  52 static void udf_fill_inode(struct inode *, struct buffer_head *);
  53 static int udf_alloc_i_data(struct inode *inode, size_t size);
  54 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  55                                         sector_t *, int *);
  56 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  57                               kernel_lb_addr, uint32_t);
  58 static void udf_split_extents(struct inode *, int *, int, int,
  59                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  60 static void udf_prealloc_extents(struct inode *, int, int,
  61                                  kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  62 static void udf_merge_extents(struct inode *,
  63                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  64 static void udf_update_extents(struct inode *,
  65                                kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  66                                struct extent_position *);
  67 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  68
  69
  70 void udf_delete_inode(struct inode *inode)
  71 {
  72         truncate_inode_pages(&inode->i_data, 0);
  73
  74         if (is_bad_inode(inode))
  75                 goto no_delete;
  76
  77         inode->i_size = 0;
  78         udf_truncate(inode);
  79         lock_kernel();
  80
  81         udf_update_inode(inode, IS_SYNC(inode));
  82         udf_free_inode(inode);
  83
  84         unlock_kernel();
  85         return;
  86
  87 no_delete:
  88         clear_inode(inode);
  89 }
  90
  91 /*
  92  * If we are going to release inode from memory, we discard preallocation and
  93  * truncate last inode extent to proper length. We could use drop_inode() but
  94  * it's called under inode_lock and thus we cannot mark inode dirty there.  We
  95  * use clear_inode() but we have to make sure to write inode as it's not written
  96  * automatically.
  97  */
  98 void udf_clear_inode(struct inode *inode)
  99 {
 100         struct udf_inode_info *iinfo;
 101         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 102                 lock_kernel();
 103                 /* Discard preallocation for directories, symlinks, etc. */
 104                 udf_discard_prealloc(inode);
 105                 udf_truncate_tail_extent(inode);
 106                 unlock_kernel();
 107                 write_inode_now(inode, 0);
 108         }
 109         iinfo = UDF_I(inode);
 110         kfree(iinfo->i_ext.i_data);
 111         iinfo->i_ext.i_data = NULL;
 112 }
 113
 114 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 115 {
 116         return block_write_full_page(page, udf_get_block, wbc);
 117 }
 118
 119 static int udf_readpage(struct file *file, struct page *page)
 120 {
 121         return block_read_full_page(page, udf_get_block);
 122 }
 123
 124 static int udf_write_begin(struct file *file, struct address_space *mapping,
 125                         loff_t pos, unsigned len, unsigned flags,
 126                         struct page **pagep, void **fsdata)
 127 {
 128         *pagep = NULL;
 129         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 130                                 udf_get_block);
 131 }
 132
 133 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 134 {
 135         return generic_block_bmap(mapping, block, udf_get_block);
 136 }
 137
 138 const struct address_space_operations udf_aops = {
 139         .readpage       = udf_readpage,
 140         .writepage      = udf_writepage,
 141         .sync_page      = block_sync_page,
 142         .write_begin            = udf_write_begin,
 143         .write_end              = generic_write_end,
 144         .bmap           = udf_bmap,
 145 };
 146
 147 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 148 {
 149         struct page *page;
 150         char *kaddr;
 151         struct udf_inode_info *iinfo = UDF_I(inode);
 152         struct writeback_control udf_wbc = {
 153                 .sync_mode = WB_SYNC_NONE,
 154                 .nr_to_write = 1,
 155         };
 156
 157         /* from now on we have normal address_space methods */
 158         inode->i_data.a_ops = &udf_aops;
 159
 160         if (!iinfo->i_lenAlloc) {
 161                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 162                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 163                 else
 164                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 165                 mark_inode_dirty(inode);
 166                 return;
 167         }
 168
 169         page = grab_cache_page(inode->i_mapping, 0);
 170         BUG_ON(!PageLocked(page));
 171
 172         if (!PageUptodate(page)) {
 173                 kaddr = kmap(page);
 174                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 175                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 176                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 177                         iinfo->i_lenAlloc);
 178                 flush_dcache_page(page);
 179                 SetPageUptodate(page);
 180                 kunmap(page);
 181         }
 182         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 183                iinfo->i_lenAlloc);
 184         iinfo->i_lenAlloc = 0;
 185         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 186                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 187         else
 188                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 189
 190         inode->i_data.a_ops->writepage(page, &udf_wbc);
 191         page_cache_release(page);
 192
 193         mark_inode_dirty(inode);
 194 }
 195
 196 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 197                                            int *err)
 198 {
 199         int newblock;
 200         struct buffer_head *dbh = NULL;
 201         kernel_lb_addr eloc;
 202         uint32_t elen;
 203         uint8_t alloctype;
 204         struct extent_position epos;
 205
 206         struct udf_fileident_bh sfibh, dfibh;
 207         loff_t f_pos = udf_ext0_offset(inode);
 208         int size = udf_ext0_offset(inode) + inode->i_size;
 209         struct fileIdentDesc cfi, *sfi, *dfi;
 210         struct udf_inode_info *iinfo = UDF_I(inode);
 211
 212         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 213                 alloctype = ICBTAG_FLAG_AD_SHORT;
 214         else
 215                 alloctype = ICBTAG_FLAG_AD_LONG;
 216
 217         if (!inode->i_size) {
 218                 iinfo->i_alloc_type = alloctype;
 219                 mark_inode_dirty(inode);
 220                 return NULL;
 221         }
 222
 223         /* alloc block, and copy data to it */
 224         *block = udf_new_block(inode->i_sb, inode,
 225                                iinfo->i_location.partitionReferenceNum,
 226                                iinfo->i_location.logicalBlockNum, err);
 227         if (!(*block))
 228                 return NULL;
 229         newblock = udf_get_pblock(inode->i_sb, *block,
 230                                   iinfo->i_location.partitionReferenceNum,
 231                                 0);
 232         if (!newblock)
 233                 return NULL;
 234         dbh = udf_tgetblk(inode->i_sb, newblock);
 235         if (!dbh)
 236                 return NULL;
 237         lock_buffer(dbh);
 238         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 239         set_buffer_uptodate(dbh);
 240         unlock_buffer(dbh);
 241         mark_buffer_dirty_inode(dbh, inode);
 242
 243         sfibh.soffset = sfibh.eoffset =
 244                         f_pos & (inode->i_sb->s_blocksize - 1);
 245         sfibh.sbh = sfibh.ebh = NULL;
 246         dfibh.soffset = dfibh.eoffset = 0;
 247         dfibh.sbh = dfibh.ebh = dbh;
 248         while (f_pos < size) {
 249                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 250                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 251                                          NULL, NULL, NULL);
 252                 if (!sfi) {
 253                         brelse(dbh);
 254                         return NULL;
 255                 }
 256                 iinfo->i_alloc_type = alloctype;
 257                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 258                 dfibh.soffset = dfibh.eoffset;
 259                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 260                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 261                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 262                                  sfi->fileIdent +
 263                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 264                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 265                         brelse(dbh);
 266                         return NULL;
 267                 }
 268         }
 269         mark_buffer_dirty_inode(dbh, inode);
 270
 271         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 272                 iinfo->i_lenAlloc);
 273         iinfo->i_lenAlloc = 0;
 274         eloc.logicalBlockNum = *block;
 275         eloc.partitionReferenceNum =
 276                                 iinfo->i_location.partitionReferenceNum;
 277         elen = inode->i_sb->s_blocksize;
 278         iinfo->i_lenExtents = elen;
 279         epos.bh = NULL;
 280         epos.block = iinfo->i_location;
 281         epos.offset = udf_file_entry_alloc_offset(inode);
 282         udf_add_aext(inode, &epos, eloc, elen, 0);
 283         /* UniqueID stuff */
 284
 285         brelse(epos.bh);
 286         mark_inode_dirty(inode);
 287         return dbh;
 288 }
 289
 290 static int udf_get_block(struct inode *inode, sector_t block,
 291                          struct buffer_head *bh_result, int create)
 292 {
 293         int err, new;
 294         struct buffer_head *bh;
 295         sector_t phys = 0;
 296         struct udf_inode_info *iinfo;
 297
 298         if (!create) {
 299                 phys = udf_block_map(inode, block);
 300                 if (phys)
 301                         map_bh(bh_result, inode->i_sb, phys);
 302                 return 0;
 303         }
 304
 305         err = -EIO;
 306         new = 0;
 307         bh = NULL;
 308
 309         lock_kernel();
 310
 311         iinfo = UDF_I(inode);
 312         if (block == iinfo->i_next_alloc_block + 1) {
 313                 iinfo->i_next_alloc_block++;
 314                 iinfo->i_next_alloc_goal++;
 315         }
 316
 317         err = 0;
 318
 319         bh = inode_getblk(inode, block, &err, &phys, &new);
 320         BUG_ON(bh);
 321         if (err)
 322                 goto abort;
 323         BUG_ON(!phys);
 324
 325         if (new)
 326                 set_buffer_new(bh_result);
 327         map_bh(bh_result, inode->i_sb, phys);
 328
 329 abort:
 330         unlock_kernel();
 331         return err;
 332 }
 333
 334 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 335                                       int create, int *err)
 336 {
 337         struct buffer_head *bh;
 338         struct buffer_head dummy;
 339
 340         dummy.b_state = 0;
 341         dummy.b_blocknr = -1000;
 342         *err = udf_get_block(inode, block, &dummy, create);
 343         if (!*err && buffer_mapped(&dummy)) {
 344                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 345                 if (buffer_new(&dummy)) {
 346                         lock_buffer(bh);
 347                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 348                         set_buffer_uptodate(bh);
 349                         unlock_buffer(bh);
 350                         mark_buffer_dirty_inode(bh, inode);
 351                 }
 352                 return bh;
 353         }
 354
 355         return NULL;
 356 }
 357
 358 /* Extend the file by 'blocks' blocks, return the number of extents added */
 359 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 360                     kernel_long_ad *last_ext, sector_t blocks)
 361 {
 362         sector_t add;
 363         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 364         struct super_block *sb = inode->i_sb;
 365         kernel_lb_addr prealloc_loc = {};
 366         int prealloc_len = 0;
 367         struct udf_inode_info *iinfo;
 368
 369         /* The previous extent is fake and we should not extend by anything
 370          * - there's nothing to do... */
 371         if (!blocks && fake)
 372                 return 0;
 373
 374         iinfo = UDF_I(inode);
 375         /* Round the last extent up to a multiple of block size */
 376         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 377                 last_ext->extLength =
 378                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 379                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 380                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 381                 iinfo->i_lenExtents =
 382                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 383                         ~(sb->s_blocksize - 1);
 384         }
 385
 386         /* Last extent are just preallocated blocks? */
 387         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 388                                                 EXT_NOT_RECORDED_ALLOCATED) {
 389                 /* Save the extent so that we can reattach it to the end */
 390                 prealloc_loc = last_ext->extLocation;
 391                 prealloc_len = last_ext->extLength;
 392                 /* Mark the extent as a hole */
 393                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 394                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 395                 last_ext->extLocation.logicalBlockNum = 0;
 396                 last_ext->extLocation.partitionReferenceNum = 0;
 397         }
 398
 399         /* Can we merge with the previous extent? */
 400         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 401                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 402                 add = ((1 << 30) - sb->s_blocksize -
 403                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 404                         sb->s_blocksize_bits;
 405                 if (add > blocks)
 406                         add = blocks;
 407                 blocks -= add;
 408                 last_ext->extLength += add << sb->s_blocksize_bits;
 409         }
 410
 411         if (fake) {
 412                 udf_add_aext(inode, last_pos, last_ext->extLocation,
 413                              last_ext->extLength, 1);
 414                 count++;
 415         } else
 416                 udf_write_aext(inode, last_pos, last_ext->extLocation,
 417                                 last_ext->extLength, 1);
 418
 419         /* Managed to do everything necessary? */
 420         if (!blocks)
 421                 goto out;
 422
 423         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 424         last_ext->extLocation.logicalBlockNum = 0;
 425         last_ext->extLocation.partitionReferenceNum = 0;
 426         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 427         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 428                                 (add << sb->s_blocksize_bits);
 429
 430         /* Create enough extents to cover the whole hole */
 431         while (blocks > add) {
 432                 blocks -= add;
 433                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 434                                  last_ext->extLength, 1) == -1)
 435                         return -1;
 436                 count++;
 437         }
 438         if (blocks) {
 439                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 440                         (blocks << sb->s_blocksize_bits);
 441                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 442                                  last_ext->extLength, 1) == -1)
 443                         return -1;
 444                 count++;
 445         }
 446
 447 out:
 448         /* Do we have some preallocated blocks saved? */
 449         if (prealloc_len) {
 450                 if (udf_add_aext(inode, last_pos, prealloc_loc,
 451                                  prealloc_len, 1) == -1)
 452                         return -1;
 453                 last_ext->extLocation = prealloc_loc;
 454                 last_ext->extLength = prealloc_len;
 455                 count++;
 456         }
 457
 458         /* last_pos should point to the last written extent... */
 459         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 460                 last_pos->offset -= sizeof(short_ad);
 461         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 462                 last_pos->offset -= sizeof(long_ad);
 463         else
 464                 return -1;
 465
 466         return count;
 467 }
 468
 469 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 470                                         int *err, sector_t *phys, int *new)
 471 {
 472         static sector_t last_block;
 473         struct buffer_head *result = NULL;
 474         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 475         struct extent_position prev_epos, cur_epos, next_epos;
 476         int count = 0, startnum = 0, endnum = 0;
 477         uint32_t elen = 0, tmpelen;
 478         kernel_lb_addr eloc, tmpeloc;
 479         int c = 1;
 480         loff_t lbcount = 0, b_off = 0;
 481         uint32_t newblocknum, newblock;
 482         sector_t offset = 0;
 483         int8_t etype;
 484         struct udf_inode_info *iinfo = UDF_I(inode);
 485         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 486         int lastblock = 0;
 487
 488         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 489         prev_epos.block = iinfo->i_location;
 490         prev_epos.bh = NULL;
 491         cur_epos = next_epos = prev_epos;
 492         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 493
 494         /* find the extent which contains the block we are looking for.
 495            alternate between laarr[0] and laarr[1] for locations of the
 496            current extent, and the previous extent */
 497         do {
 498                 if (prev_epos.bh != cur_epos.bh) {
 499                         brelse(prev_epos.bh);
 500                         get_bh(cur_epos.bh);
 501                         prev_epos.bh = cur_epos.bh;
 502                 }
 503                 if (cur_epos.bh != next_epos.bh) {
 504                         brelse(cur_epos.bh);
 505                         get_bh(next_epos.bh);
 506                         cur_epos.bh = next_epos.bh;
 507                 }
 508
 509                 lbcount += elen;
 510
 511                 prev_epos.block = cur_epos.block;
 512                 cur_epos.block = next_epos.block;
 513
 514                 prev_epos.offset = cur_epos.offset;
 515                 cur_epos.offset = next_epos.offset;
 516
 517                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 518                 if (etype == -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,
 573                                 sizeof(kernel_lb_addr));
 574                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 575                         /* Will udf_extend_file() create real extent from
 576                            a fake one? */
 577                         startnum = (offset > 0);
 578                 }
 579                 /* Create extents for the hole between EOF and offset */
 580                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 581                 if (ret == -1) {
 582                         brelse(prev_epos.bh);
 583                         brelse(cur_epos.bh);
 584                         brelse(next_epos.bh);
 585                         /* We don't really know the error here so we just make
 586                          * something up */
 587                         *err = -ENOSPC;
 588                         return NULL;
 589                 }
 590                 c = 0;
 591                 offset = 0;
 592                 count += ret;
 593                 /* We are not covered by a preallocated extent? */
 594                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 595                                                 EXT_NOT_RECORDED_ALLOCATED) {
 596                         /* Is there any real extent? - otherwise we overwrite
 597                          * the fake one... */
 598                         if (count)
 599                                 c = !c;
 600                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 601                                 inode->i_sb->s_blocksize;
 602                         memset(&laarr[c].extLocation, 0x00,
 603                                 sizeof(kernel_lb_addr));
 604                         count++;
 605                         endnum++;
 606                 }
 607                 endnum = c + 1;
 608                 lastblock = 1;
 609         } else {
 610                 endnum = startnum = ((count > 2) ? 2 : count);
 611
 612                 /* if the current extent is in position 0,
 613                    swap it with the previous */
 614                 if (!c && count != 1) {
 615                         laarr[2] = laarr[0];
 616                         laarr[0] = laarr[1];
 617                         laarr[1] = laarr[2];
 618                         c = 1;
 619                 }
 620
 621                 /* if the current block is located in an extent,
 622                    read the next extent */
 623                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 624                 if (etype != -1) {
 625                         laarr[c + 1].extLength = (etype << 30) | elen;
 626                         laarr[c + 1].extLocation = eloc;
 627                         count++;
 628                         startnum++;
 629                         endnum++;
 630                 } else
 631                         lastblock = 1;
 632         }
 633
 634         /* if the current extent is not recorded but allocated, get the
 635          * block in the extent corresponding to the requested block */
 636         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 637                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 638         else { /* otherwise, allocate a new block */
 639                 if (iinfo->i_next_alloc_block == block)
 640                         goal = iinfo->i_next_alloc_goal;
 641
 642                 if (!goal) {
 643                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 644                                 goal = iinfo->i_location.logicalBlockNum + 1;
 645                 }
 646
 647                 newblocknum = udf_new_block(inode->i_sb, inode,
 648                                 iinfo->i_location.partitionReferenceNum,
 649                                 goal, err);
 650                 if (!newblocknum) {
 651                         brelse(prev_epos.bh);
 652                         *err = -ENOSPC;
 653                         return NULL;
 654                 }
 655                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 656         }
 657
 658         /* if the extent the requsted block is located in contains multiple
 659          * blocks, split the extent into at most three extents. blocks prior
 660          * to requested block, requested block, and blocks after requested
 661          * block */
 662         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 663
 664 #ifdef UDF_PREALLOCATE
 665         /* preallocate blocks */
 666         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 667 #endif
 668
 669         /* merge any continuous blocks in laarr */
 670         udf_merge_extents(inode, laarr, &endnum);
 671
 672         /* write back the new extents, inserting new extents if the new number
 673          * of extents is greater than the old number, and deleting extents if
 674          * the new number of extents is less than the old number */
 675         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 676
 677         brelse(prev_epos.bh);
 678
 679         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 680                                 iinfo->i_location.partitionReferenceNum, 0);
 681         if (!newblock)
 682                 return NULL;
 683         *phys = newblock;
 684         *err = 0;
 685         *new = 1;
 686         iinfo->i_next_alloc_block = block;
 687         iinfo->i_next_alloc_goal = newblocknum;
 688         inode->i_ctime = current_fs_time(inode->i_sb);
 689
 690         if (IS_SYNC(inode))
 691                 udf_sync_inode(inode);
 692         else
 693                 mark_inode_dirty(inode);
 694
 695         return result;
 696 }
 697
 698 static void udf_split_extents(struct inode *inode, int *c, int offset,
 699                               int newblocknum,
 700                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 701                               int *endnum)
 702 {
 703         unsigned long blocksize = inode->i_sb->s_blocksize;
 704         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 705
 706         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 707             (laarr[*c].extLength >> 30) ==
 708                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 709                 int curr = *c;
 710                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 711                             blocksize - 1) >> blocksize_bits;
 712                 int8_t etype = (laarr[curr].extLength >> 30);
 713
 714                 if (blen == 1)
 715                         ;
 716                 else if (!offset || blen == offset + 1) {
 717                         laarr[curr + 2] = laarr[curr + 1];
 718                         laarr[curr + 1] = laarr[curr];
 719                 } else {
 720                         laarr[curr + 3] = laarr[curr + 1];
 721                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 722                 }
 723
 724                 if (offset) {
 725                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 726                                 udf_free_blocks(inode->i_sb, inode,
 727                                                 laarr[curr].extLocation,
 728                                                 0, offset);
 729                                 laarr[curr].extLength =
 730                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 731                                         (offset << blocksize_bits);
 732                                 laarr[curr].extLocation.logicalBlockNum = 0;
 733                                 laarr[curr].extLocation.
 734                                                 partitionReferenceNum = 0;
 735                         } else
 736                                 laarr[curr].extLength = (etype << 30) |
 737                                         (offset << blocksize_bits);
 738                         curr++;
 739                         (*c)++;
 740                         (*endnum)++;
 741                 }
 742
 743                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 744                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 745                         laarr[curr].extLocation.partitionReferenceNum =
 746                                 UDF_I(inode)->i_location.partitionReferenceNum;
 747                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 748                         blocksize;
 749                 curr++;
 750
 751                 if (blen != offset + 1) {
 752                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 753                                 laarr[curr].extLocation.logicalBlockNum +=
 754                                                                 offset + 1;
 755                         laarr[curr].extLength = (etype << 30) |
 756                                 ((blen - (offset + 1)) << blocksize_bits);
 757                         curr++;
 758                         (*endnum)++;
 759                 }
 760         }
 761 }
 762
 763 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 764                                  kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 765                                  int *endnum)
 766 {
 767         int start, length = 0, currlength = 0, i;
 768
 769         if (*endnum >= (c + 1)) {
 770                 if (!lastblock)
 771                         return;
 772                 else
 773                         start = c;
 774         } else {
 775                 if ((laarr[c + 1].extLength >> 30) ==
 776                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 777                         start = c + 1;
 778                         length = currlength =
 779                                 (((laarr[c + 1].extLength &
 780                                         UDF_EXTENT_LENGTH_MASK) +
 781                                 inode->i_sb->s_blocksize - 1) >>
 782                                 inode->i_sb->s_blocksize_bits);
 783                 } else
 784                         start = c;
 785         }
 786
 787         for (i = start + 1; i <= *endnum; i++) {
 788                 if (i == *endnum) {
 789                         if (lastblock)
 790                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 791                 } else if ((laarr[i].extLength >> 30) ==
 792                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 793                         length += (((laarr[i].extLength &
 794                                                 UDF_EXTENT_LENGTH_MASK) +
 795                                     inode->i_sb->s_blocksize - 1) >>
 796                                     inode->i_sb->s_blocksize_bits);
 797                 } else
 798                         break;
 799         }
 800
 801         if (length) {
 802                 int next = laarr[start].extLocation.logicalBlockNum +
 803                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 804                           inode->i_sb->s_blocksize - 1) >>
 805                           inode->i_sb->s_blocksize_bits);
 806                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 807                                 laarr[start].extLocation.partitionReferenceNum,
 808                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 809                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 810                                 currlength);
 811                 if (numalloc)   {
 812                         if (start == (c + 1))
 813                                 laarr[start].extLength +=
 814                                         (numalloc <<
 815                                          inode->i_sb->s_blocksize_bits);
 816                         else {
 817                                 memmove(&laarr[c + 2], &laarr[c + 1],
 818                                         sizeof(long_ad) * (*endnum - (c + 1)));
 819                                 (*endnum)++;
 820                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 821                                 laarr[c + 1].extLocation.partitionReferenceNum =
 822                                         laarr[c].extLocation.
 823                                                         partitionReferenceNum;
 824                                 laarr[c + 1].extLength =
 825                                         EXT_NOT_RECORDED_ALLOCATED |
 826                                         (numalloc <<
 827                                          inode->i_sb->s_blocksize_bits);
 828                                 start = c + 1;
 829                         }
 830
 831                         for (i = start + 1; numalloc && i < *endnum; i++) {
 832                                 int elen = ((laarr[i].extLength &
 833                                                 UDF_EXTENT_LENGTH_MASK) +
 834                                             inode->i_sb->s_blocksize - 1) >>
 835                                             inode->i_sb->s_blocksize_bits;
 836
 837                                 if (elen > numalloc) {
 838                                         laarr[i].extLength -=
 839                                                 (numalloc <<
 840                                                  inode->i_sb->s_blocksize_bits);
 841                                         numalloc = 0;
 842                                 } else {
 843                                         numalloc -= elen;
 844                                         if (*endnum > (i + 1))
 845                                                 memmove(&laarr[i],
 846                                                         &laarr[i + 1],
 847                                                         sizeof(long_ad) *
 848                                                         (*endnum - (i + 1)));
 849                                         i--;
 850                                         (*endnum)--;
 851                                 }
 852                         }
 853                         UDF_I(inode)->i_lenExtents +=
 854                                 numalloc << inode->i_sb->s_blocksize_bits;
 855                 }
 856         }
 857 }
 858
 859 static void udf_merge_extents(struct inode *inode,
 860                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 861                               int *endnum)
 862 {
 863         int i;
 864         unsigned long blocksize = inode->i_sb->s_blocksize;
 865         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 866
 867         for (i = 0; i < (*endnum - 1); i++) {
 868                 kernel_long_ad *li /*l[i]*/ = &laarr[i];
 869                 kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 870
 871                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 872                         (((li->extLength >> 30) ==
 873                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 874                         ((lip1->extLocation.logicalBlockNum -
 875                           li->extLocation.logicalBlockNum) ==
 876                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 877                         blocksize - 1) >> blocksize_bits)))) {
 878
 879                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 880                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 881                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 882                                 lip1->extLength = (lip1->extLength -
 883                                                   (li->extLength &
 884                                                    UDF_EXTENT_LENGTH_MASK) +
 885                                                    UDF_EXTENT_LENGTH_MASK) &
 886                                                         ~(blocksize - 1);
 887                                 li->extLength = (li->extLength &
 888                                                  UDF_EXTENT_FLAG_MASK) +
 889                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 890                                                 blocksize;
 891                                 lip1->extLocation.logicalBlockNum =
 892                                         li->extLocation.logicalBlockNum +
 893                                         ((li->extLength &
 894                                                 UDF_EXTENT_LENGTH_MASK) >>
 895                                                 blocksize_bits);
 896                         } else {
 897                                 li->extLength = lip1->extLength +
 898                                         (((li->extLength &
 899                                                 UDF_EXTENT_LENGTH_MASK) +
 900                                          blocksize - 1) & ~(blocksize - 1));
 901                                 if (*endnum > (i + 2))
 902                                         memmove(&laarr[i + 1], &laarr[i + 2],
 903                                                 sizeof(long_ad) *
 904                                                 (*endnum - (i + 2)));
 905                                 i--;
 906                                 (*endnum)--;
 907                         }
 908                 } else if (((li->extLength >> 30) ==
 909                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 910                            ((lip1->extLength >> 30) ==
 911                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 912                         udf_free_blocks(inode->i_sb, inode, li->extLocation, 0,
 913                                         ((li->extLength &
 914                                           UDF_EXTENT_LENGTH_MASK) +
 915                                          blocksize - 1) >> blocksize_bits);
 916                         li->extLocation.logicalBlockNum = 0;
 917                         li->extLocation.partitionReferenceNum = 0;
 918
 919                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 920                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 921                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 922                                 lip1->extLength = (lip1->extLength -
 923                                                    (li->extLength &
 924                                                    UDF_EXTENT_LENGTH_MASK) +
 925                                                    UDF_EXTENT_LENGTH_MASK) &
 926                                                    ~(blocksize - 1);
 927                                 li->extLength = (li->extLength &
 928                                                  UDF_EXTENT_FLAG_MASK) +
 929                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 930                                                 blocksize;
 931                         } else {
 932                                 li->extLength = lip1->extLength +
 933                                         (((li->extLength &
 934                                                 UDF_EXTENT_LENGTH_MASK) +
 935                                           blocksize - 1) & ~(blocksize - 1));
 936                                 if (*endnum > (i + 2))
 937                                         memmove(&laarr[i + 1], &laarr[i + 2],
 938                                                 sizeof(long_ad) *
 939                                                 (*endnum - (i + 2)));
 940                                 i--;
 941                                 (*endnum)--;
 942                         }
 943                 } else if ((li->extLength >> 30) ==
 944                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 945                         udf_free_blocks(inode->i_sb, inode,
 946                                         li->extLocation, 0,
 947                                         ((li->extLength &
 948                                                 UDF_EXTENT_LENGTH_MASK) +
 949                                          blocksize - 1) >> blocksize_bits);
 950                         li->extLocation.logicalBlockNum = 0;
 951                         li->extLocation.partitionReferenceNum = 0;
 952                         li->extLength = (li->extLength &
 953                                                 UDF_EXTENT_LENGTH_MASK) |
 954                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 955                 }
 956         }
 957 }
 958
 959 static void udf_update_extents(struct inode *inode,
 960                                kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 961                                int startnum, int endnum,
 962                                struct extent_position *epos)
 963 {
 964         int start = 0, i;
 965         kernel_lb_addr tmploc;
 966         uint32_t tmplen;
 967
 968         if (startnum > endnum) {
 969                 for (i = 0; i < (startnum - endnum); i++)
 970                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 971                                         laarr[i].extLength);
 972         } else if (startnum < endnum) {
 973                 for (i = 0; i < (endnum - startnum); i++) {
 974                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 975                                         laarr[i].extLength);
 976                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 977                                       &laarr[i].extLength, 1);
 978                         start++;
 979                 }
 980         }
 981
 982         for (i = start; i < endnum; i++) {
 983                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 984                 udf_write_aext(inode, epos, laarr[i].extLocation,
 985                                laarr[i].extLength, 1);
 986         }
 987 }
 988
 989 struct buffer_head *udf_bread(struct inode *inode, int block,
 990                               int create, int *err)
 991 {
 992         struct buffer_head *bh = NULL;
 993
 994         bh = udf_getblk(inode, block, create, err);
 995         if (!bh)
 996                 return NULL;
 997
 998         if (buffer_uptodate(bh))
 999                 return bh;
1000
1001         ll_rw_block(READ, 1, &bh);
1002
1003         wait_on_buffer(bh);
1004         if (buffer_uptodate(bh))
1005                 return bh;
1006
1007         brelse(bh);
1008         *err = -EIO;
1009         return NULL;
1010 }
1011
1012 void udf_truncate(struct inode *inode)
1013 {
1014         int offset;
1015         int err;
1016         struct udf_inode_info *iinfo;
1017
1018         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1019               S_ISLNK(inode->i_mode)))
1020                 return;
1021         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1022                 return;
1023
1024         lock_kernel();
1025         iinfo = UDF_I(inode);
1026         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1027                 if (inode->i_sb->s_blocksize <
1028                                 (udf_file_entry_alloc_offset(inode) +
1029                                  inode->i_size)) {
1030                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1031                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1032                                 inode->i_size = iinfo->i_lenAlloc;
1033                                 unlock_kernel();
1034                                 return;
1035                         } else
1036                                 udf_truncate_extents(inode);
1037                 } else {
1038                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1039                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1040                                 0x00, inode->i_sb->s_blocksize -
1041                                 offset - udf_file_entry_alloc_offset(inode));
1042                         iinfo->i_lenAlloc = inode->i_size;
1043                 }
1044         } else {
1045                 block_truncate_page(inode->i_mapping, inode->i_size,
1046                                     udf_get_block);
1047                 udf_truncate_extents(inode);
1048         }
1049
1050         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1051         if (IS_SYNC(inode))
1052                 udf_sync_inode(inode);
1053         else
1054                 mark_inode_dirty(inode);
1055         unlock_kernel();
1056 }
1057
1058 static void __udf_read_inode(struct inode *inode)
1059 {
1060         struct buffer_head *bh = NULL;
1061         struct fileEntry *fe;
1062         uint16_t ident;
1063         struct udf_inode_info *iinfo = UDF_I(inode);
1064
1065         /*
1066          * Set defaults, but the inode is still incomplete!
1067          * Note: get_new_inode() sets the following on a new inode:
1068          *      i_sb = sb
1069          *      i_no = ino
1070          *      i_flags = sb->s_flags
1071          *      i_state = 0
1072          * clean_inode(): zero fills and sets
1073          *      i_count = 1
1074          *      i_nlink = 1
1075          *      i_op = NULL;
1076          */
1077         bh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 0, &ident);
1078         if (!bh) {
1079                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1080                        inode->i_ino);
1081                 make_bad_inode(inode);
1082                 return;
1083         }
1084
1085         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1086             ident != TAG_IDENT_USE) {
1087                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1088                                 "failed ident=%d\n", inode->i_ino, ident);
1089                 brelse(bh);
1090                 make_bad_inode(inode);
1091                 return;
1092         }
1093
1094         fe = (struct fileEntry *)bh->b_data;
1095
1096         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1097                 struct buffer_head *ibh;
1098
1099                 ibh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 1,
1100                                         &ident);
1101                 if (ident == TAG_IDENT_IE && ibh) {
1102                         struct buffer_head *nbh = NULL;
1103                         kernel_lb_addr loc;
1104                         struct indirectEntry *ie;
1105
1106                         ie = (struct indirectEntry *)ibh->b_data;
1107                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1108
1109                         if (ie->indirectICB.extLength &&
1110                                 (nbh = udf_read_ptagged(inode->i_sb, loc, 0,
1111                                                         &ident))) {
1112                                 if (ident == TAG_IDENT_FE ||
1113                                         ident == TAG_IDENT_EFE) {
1114                                         memcpy(&iinfo->i_location,
1115                                                 &loc,
1116                                                 sizeof(kernel_lb_addr));
1117                                         brelse(bh);
1118                                         brelse(ibh);
1119                                         brelse(nbh);
1120                                         __udf_read_inode(inode);
1121                                         return;
1122                                 }
1123                                 brelse(nbh);
1124                         }
1125                 }
1126                 brelse(ibh);
1127         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1128                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1129                        le16_to_cpu(fe->icbTag.strategyType));
1130                 brelse(bh);
1131                 make_bad_inode(inode);
1132                 return;
1133         }
1134         udf_fill_inode(inode, bh);
1135
1136         brelse(bh);
1137 }
1138
1139 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1140 {
1141         struct fileEntry *fe;
1142         struct extendedFileEntry *efe;
1143         int offset;
1144         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1145         struct udf_inode_info *iinfo = UDF_I(inode);
1146
1147         fe = (struct fileEntry *)bh->b_data;
1148         efe = (struct extendedFileEntry *)bh->b_data;
1149
1150         if (fe->icbTag.strategyType == cpu_to_le16(4))
1151                 iinfo->i_strat4096 = 0;
1152         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1153                 iinfo->i_strat4096 = 1;
1154
1155         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1156                                                         ICBTAG_FLAG_AD_MASK;
1157         iinfo->i_unique = 0;
1158         iinfo->i_lenEAttr = 0;
1159         iinfo->i_lenExtents = 0;
1160         iinfo->i_lenAlloc = 0;
1161         iinfo->i_next_alloc_block = 0;
1162         iinfo->i_next_alloc_goal = 0;
1163         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1164                 iinfo->i_efe = 1;
1165                 iinfo->i_use = 0;
1166                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1167                                         sizeof(struct extendedFileEntry))) {
1168                         make_bad_inode(inode);
1169                         return;
1170                 }
1171                 memcpy(iinfo->i_ext.i_data,
1172                        bh->b_data + sizeof(struct extendedFileEntry),
1173                        inode->i_sb->s_blocksize -
1174                                         sizeof(struct extendedFileEntry));
1175         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1176                 iinfo->i_efe = 0;
1177                 iinfo->i_use = 0;
1178                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1179                                                 sizeof(struct fileEntry))) {
1180                         make_bad_inode(inode);
1181                         return;
1182                 }
1183                 memcpy(iinfo->i_ext.i_data,
1184                        bh->b_data + sizeof(struct fileEntry),
1185                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1186         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1187                 iinfo->i_efe = 0;
1188                 iinfo->i_use = 1;
1189                 iinfo->i_lenAlloc = le32_to_cpu(
1190                                 ((struct unallocSpaceEntry *)bh->b_data)->
1191                                  lengthAllocDescs);
1192                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1193                                         sizeof(struct unallocSpaceEntry))) {
1194                         make_bad_inode(inode);
1195                         return;
1196                 }
1197                 memcpy(iinfo->i_ext.i_data,
1198                        bh->b_data + sizeof(struct unallocSpaceEntry),
1199                        inode->i_sb->s_blocksize -
1200                                         sizeof(struct unallocSpaceEntry));
1201                 return;
1202         }
1203
1204         inode->i_uid = le32_to_cpu(fe->uid);
1205         if (inode->i_uid == -1 ||
1206             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1207             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1208                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1209
1210         inode->i_gid = le32_to_cpu(fe->gid);
1211         if (inode->i_gid == -1 ||
1212             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1213             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1214                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1215
1216         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1217         if (!inode->i_nlink)
1218                 inode->i_nlink = 1;
1219
1220         inode->i_size = le64_to_cpu(fe->informationLength);
1221         iinfo->i_lenExtents = inode->i_size;
1222
1223         inode->i_mode = udf_convert_permissions(fe);
1224         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1225
1226         if (iinfo->i_efe == 0) {
1227                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1228                         (inode->i_sb->s_blocksize_bits - 9);
1229
1230                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1231                         inode->i_atime = sbi->s_record_time;
1232
1233                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1234                                             fe->modificationTime))
1235                         inode->i_mtime = sbi->s_record_time;
1236
1237                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1238                         inode->i_ctime = sbi->s_record_time;
1239
1240                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1241                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1242                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1243                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1244         } else {
1245                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1246                     (inode->i_sb->s_blocksize_bits - 9);
1247
1248                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1249                         inode->i_atime = sbi->s_record_time;
1250
1251                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1252                                             efe->modificationTime))
1253                         inode->i_mtime = sbi->s_record_time;
1254
1255                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1256                         iinfo->i_crtime = sbi->s_record_time;
1257
1258                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1259                         inode->i_ctime = sbi->s_record_time;
1260
1261                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1262                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1263                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1264                 offset = sizeof(struct extendedFileEntry) +
1265                                                         iinfo->i_lenEAttr;
1266         }
1267
1268         switch (fe->icbTag.fileType) {
1269         case ICBTAG_FILE_TYPE_DIRECTORY:
1270                 inode->i_op = &udf_dir_inode_operations;
1271                 inode->i_fop = &udf_dir_operations;
1272                 inode->i_mode |= S_IFDIR;
1273                 inc_nlink(inode);
1274                 break;
1275         case ICBTAG_FILE_TYPE_REALTIME:
1276         case ICBTAG_FILE_TYPE_REGULAR:
1277         case ICBTAG_FILE_TYPE_UNDEF:
1278                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1279                         inode->i_data.a_ops = &udf_adinicb_aops;
1280                 else
1281                         inode->i_data.a_ops = &udf_aops;
1282                 inode->i_op = &udf_file_inode_operations;
1283                 inode->i_fop = &udf_file_operations;
1284                 inode->i_mode |= S_IFREG;
1285                 break;
1286         case ICBTAG_FILE_TYPE_BLOCK:
1287                 inode->i_mode |= S_IFBLK;
1288                 break;
1289         case ICBTAG_FILE_TYPE_CHAR:
1290                 inode->i_mode |= S_IFCHR;
1291                 break;
1292         case ICBTAG_FILE_TYPE_FIFO:
1293                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1294                 break;
1295         case ICBTAG_FILE_TYPE_SOCKET:
1296                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1297                 break;
1298         case ICBTAG_FILE_TYPE_SYMLINK:
1299                 inode->i_data.a_ops = &udf_symlink_aops;
1300                 inode->i_op = &page_symlink_inode_operations;
1301                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1302                 break;
1303         default:
1304                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1305                                 "file type=%d\n", inode->i_ino,
1306                                 fe->icbTag.fileType);
1307                 make_bad_inode(inode);
1308                 return;
1309         }
1310         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1311                 struct deviceSpec *dsea =
1312                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1313                 if (dsea) {
1314                         init_special_inode(inode, inode->i_mode,
1315                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1316                                       le32_to_cpu(dsea->minorDeviceIdent)));
1317                         /* Developer ID ??? */
1318                 } else
1319                         make_bad_inode(inode);
1320         }
1321 }
1322
1323 static int udf_alloc_i_data(struct inode *inode, size_t size)
1324 {
1325         struct udf_inode_info *iinfo = UDF_I(inode);
1326         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1327
1328         if (!iinfo->i_ext.i_data) {
1329                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1330                                 "no free memory\n", inode->i_ino);
1331                 return -ENOMEM;
1332         }
1333
1334         return 0;
1335 }
1336
1337 static mode_t udf_convert_permissions(struct fileEntry *fe)
1338 {
1339         mode_t mode;
1340         uint32_t permissions;
1341         uint32_t flags;
1342
1343         permissions = le32_to_cpu(fe->permissions);
1344         flags = le16_to_cpu(fe->icbTag.flags);
1345
1346         mode =  ((permissions) & S_IRWXO) |
1347                 ((permissions >> 2) & S_IRWXG) |
1348                 ((permissions >> 4) & S_IRWXU) |
1349                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1350                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1351                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1352
1353         return mode;
1354 }
1355
1356 int udf_write_inode(struct inode *inode, int sync)
1357 {
1358         int ret;
1359
1360         lock_kernel();
1361         ret = udf_update_inode(inode, sync);
1362         unlock_kernel();
1363
1364         return ret;
1365 }
1366
1367 int udf_sync_inode(struct inode *inode)
1368 {
1369         return udf_update_inode(inode, 1);
1370 }
1371
1372 static int udf_update_inode(struct inode *inode, int do_sync)
1373 {
1374         struct buffer_head *bh = NULL;
1375         struct fileEntry *fe;
1376         struct extendedFileEntry *efe;
1377         uint32_t udfperms;
1378         uint16_t icbflags;
1379         uint16_t crclen;
1380         int err = 0;
1381         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1382         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1383         struct udf_inode_info *iinfo = UDF_I(inode);
1384
1385         bh = udf_tread(inode->i_sb,
1386                         udf_get_lb_pblock(inode->i_sb,
1387                                           iinfo->i_location, 0));
1388         if (!bh) {
1389                 udf_debug("bread failure\n");
1390                 return -EIO;
1391         }
1392
1393         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1394
1395         fe = (struct fileEntry *)bh->b_data;
1396         efe = (struct extendedFileEntry *)bh->b_data;
1397
1398         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1399                 struct unallocSpaceEntry *use =
1400                         (struct unallocSpaceEntry *)bh->b_data;
1401
1402                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1403                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1404                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1405                                         sizeof(struct unallocSpaceEntry));
1406                 crclen = sizeof(struct unallocSpaceEntry) +
1407                                 iinfo->i_lenAlloc - sizeof(tag);
1408                 use->descTag.tagLocation = cpu_to_le32(
1409                                                 iinfo->i_location.
1410                                                         logicalBlockNum);
1411                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1412                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use +
1413                                                            sizeof(tag), crclen,
1414                                                            0));
1415                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1416
1417                 mark_buffer_dirty(bh);
1418                 brelse(bh);
1419                 return err;
1420         }
1421
1422         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1423                 fe->uid = cpu_to_le32(-1);
1424         else
1425                 fe->uid = cpu_to_le32(inode->i_uid);
1426
1427         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1428                 fe->gid = cpu_to_le32(-1);
1429         else
1430                 fe->gid = cpu_to_le32(inode->i_gid);
1431
1432         udfperms = ((inode->i_mode & S_IRWXO)) |
1433                    ((inode->i_mode & S_IRWXG) << 2) |
1434                    ((inode->i_mode & S_IRWXU) << 4);
1435
1436         udfperms |= (le32_to_cpu(fe->permissions) &
1437                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1438                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1439                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1440         fe->permissions = cpu_to_le32(udfperms);
1441
1442         if (S_ISDIR(inode->i_mode))
1443                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1444         else
1445                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1446
1447         fe->informationLength = cpu_to_le64(inode->i_size);
1448
1449         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1450                 regid *eid;
1451                 struct deviceSpec *dsea =
1452                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1453                 if (!dsea) {
1454                         dsea = (struct deviceSpec *)
1455                                 udf_add_extendedattr(inode,
1456                                                      sizeof(struct deviceSpec) +
1457                                                      sizeof(regid), 12, 0x3);
1458                         dsea->attrType = cpu_to_le32(12);
1459                         dsea->attrSubtype = 1;
1460                         dsea->attrLength = cpu_to_le32(
1461                                                 sizeof(struct deviceSpec) +
1462                                                 sizeof(regid));
1463                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1464                 }
1465                 eid = (regid *)dsea->impUse;
1466                 memset(eid, 0, sizeof(regid));
1467                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1468                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1469                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1470                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1471                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1472         }
1473
1474         if (iinfo->i_efe == 0) {
1475                 memcpy(bh->b_data + sizeof(struct fileEntry),
1476                        iinfo->i_ext.i_data,
1477                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1478                 fe->logicalBlocksRecorded = cpu_to_le64(
1479                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1480                         (blocksize_bits - 9));
1481
1482                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1483                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1484                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1485                 memset(&(fe->impIdent), 0, sizeof(regid));
1486                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1487                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1488                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1489                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1490                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1491                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1492                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1493                 crclen = sizeof(struct fileEntry);
1494         } else {
1495                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1496                        iinfo->i_ext.i_data,
1497                        inode->i_sb->s_blocksize -
1498                                         sizeof(struct extendedFileEntry));
1499                 efe->objectSize = cpu_to_le64(inode->i_size);
1500                 efe->logicalBlocksRecorded = cpu_to_le64(
1501                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1502                         (blocksize_bits - 9));
1503
1504                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1505                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1506                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1507                         iinfo->i_crtime = inode->i_atime;
1508
1509                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1510                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1511                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1512                         iinfo->i_crtime = inode->i_mtime;
1513
1514                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1515                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1516                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1517                         iinfo->i_crtime = inode->i_ctime;
1518
1519                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1520                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1521                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1522                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1523
1524                 memset(&(efe->impIdent), 0, sizeof(regid));
1525                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1526                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1527                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1528                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1529                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1530                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1531                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1532                 crclen = sizeof(struct extendedFileEntry);
1533         }
1534         if (iinfo->i_strat4096) {
1535                 fe->icbTag.strategyType = cpu_to_le16(4096);
1536                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1537                 fe->icbTag.numEntries = cpu_to_le16(2);
1538         } else {
1539                 fe->icbTag.strategyType = cpu_to_le16(4);
1540                 fe->icbTag.numEntries = cpu_to_le16(1);
1541         }
1542
1543         if (S_ISDIR(inode->i_mode))
1544                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1545         else if (S_ISREG(inode->i_mode))
1546                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1547         else if (S_ISLNK(inode->i_mode))
1548                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1549         else if (S_ISBLK(inode->i_mode))
1550                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1551         else if (S_ISCHR(inode->i_mode))
1552                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1553         else if (S_ISFIFO(inode->i_mode))
1554                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1555         else if (S_ISSOCK(inode->i_mode))
1556                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1557
1558         icbflags =      iinfo->i_alloc_type |
1559                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1560                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1561                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1562                         (le16_to_cpu(fe->icbTag.flags) &
1563                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1564                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1565
1566         fe->icbTag.flags = cpu_to_le16(icbflags);
1567         if (sbi->s_udfrev >= 0x0200)
1568                 fe->descTag.descVersion = cpu_to_le16(3);
1569         else
1570                 fe->descTag.descVersion = cpu_to_le16(2);
1571         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1572         fe->descTag.tagLocation = cpu_to_le32(
1573                                         iinfo->i_location.logicalBlockNum);
1574         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1575                                                                 sizeof(tag);
1576         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1577         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag),
1578                                                   crclen, 0));
1579         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1580
1581         /* write the data blocks */
1582         mark_buffer_dirty(bh);
1583         if (do_sync) {
1584                 sync_dirty_buffer(bh);
1585                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1586                         printk(KERN_WARNING "IO error syncing udf inode "
1587                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1588                                 inode->i_ino);
1589                         err = -EIO;
1590                 }
1591         }
1592         brelse(bh);
1593
1594         return err;
1595 }
1596
1597 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1598 {
1599         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1600         struct inode *inode = iget_locked(sb, block);
1601
1602         if (!inode)
1603                 return NULL;
1604
1605         if (inode->i_state & I_NEW) {
1606                 memcpy(&UDF_I(inode)->i_location, &ino, sizeof(kernel_lb_addr));
1607                 __udf_read_inode(inode);
1608                 unlock_new_inode(inode);
1609         }
1610
1611         if (is_bad_inode(inode))
1612                 goto out_iput;
1613
1614         if (ino.logicalBlockNum >= UDF_SB(sb)->
1615                         s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1616                 udf_debug("block=%d, partition=%d out of range\n",
1617                           ino.logicalBlockNum, ino.partitionReferenceNum);
1618                 make_bad_inode(inode);
1619                 goto out_iput;
1620         }
1621
1622         return inode;
1623
1624  out_iput:
1625         iput(inode);
1626         return NULL;
1627 }
1628
1629 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1630                     kernel_lb_addr eloc, uint32_t elen, int inc)
1631 {
1632         int adsize;
1633         short_ad *sad = NULL;
1634         long_ad *lad = NULL;
1635         struct allocExtDesc *aed;
1636         int8_t etype;
1637         uint8_t *ptr;
1638         struct udf_inode_info *iinfo = UDF_I(inode);
1639
1640         if (!epos->bh)
1641                 ptr = iinfo->i_ext.i_data + epos->offset -
1642                         udf_file_entry_alloc_offset(inode) +
1643                         iinfo->i_lenEAttr;
1644         else
1645                 ptr = epos->bh->b_data + epos->offset;
1646
1647         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1648                 adsize = sizeof(short_ad);
1649         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1650                 adsize = sizeof(long_ad);
1651         else
1652                 return -1;
1653
1654         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1655                 char *sptr, *dptr;
1656                 struct buffer_head *nbh;
1657                 int err, loffset;
1658                 kernel_lb_addr obloc = epos->block;
1659
1660                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1661                                                 obloc.partitionReferenceNum,
1662                                                 obloc.logicalBlockNum, &err);
1663                 if (!epos->block.logicalBlockNum)
1664                         return -1;
1665                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1666                                                                  epos->block,
1667                                                                  0));
1668                 if (!nbh)
1669                         return -1;
1670                 lock_buffer(nbh);
1671                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1672                 set_buffer_uptodate(nbh);
1673                 unlock_buffer(nbh);
1674                 mark_buffer_dirty_inode(nbh, inode);
1675
1676                 aed = (struct allocExtDesc *)(nbh->b_data);
1677                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1678                         aed->previousAllocExtLocation =
1679                                         cpu_to_le32(obloc.logicalBlockNum);
1680                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1681                         loffset = epos->offset;
1682                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1683                         sptr = ptr - adsize;
1684                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1685                         memcpy(dptr, sptr, adsize);
1686                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1687                 } else {
1688                         loffset = epos->offset + adsize;
1689                         aed->lengthAllocDescs = cpu_to_le32(0);
1690                         sptr = ptr;
1691                         epos->offset = sizeof(struct allocExtDesc);
1692
1693                         if (epos->bh) {
1694                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1695                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1696                         } else {
1697                                 iinfo->i_lenAlloc += adsize;
1698                                 mark_inode_dirty(inode);
1699                         }
1700                 }
1701                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1702                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1703                                     epos->block.logicalBlockNum, sizeof(tag));
1704                 else
1705                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1706                                     epos->block.logicalBlockNum, sizeof(tag));
1707                 switch (iinfo->i_alloc_type) {
1708                 case ICBTAG_FLAG_AD_SHORT:
1709                         sad = (short_ad *)sptr;
1710                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1711                                                      inode->i_sb->s_blocksize);
1712                         sad->extPosition =
1713                                 cpu_to_le32(epos->block.logicalBlockNum);
1714                         break;
1715                 case ICBTAG_FLAG_AD_LONG:
1716                         lad = (long_ad *)sptr;
1717                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1718                                                      inode->i_sb->s_blocksize);
1719                         lad->extLocation = cpu_to_lelb(epos->block);
1720                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1721                         break;
1722                 }
1723                 if (epos->bh) {
1724                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1725                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1726                                 udf_update_tag(epos->bh->b_data, loffset);
1727                         else
1728                                 udf_update_tag(epos->bh->b_data,
1729                                                 sizeof(struct allocExtDesc));
1730                         mark_buffer_dirty_inode(epos->bh, inode);
1731                         brelse(epos->bh);
1732                 } else {
1733                         mark_inode_dirty(inode);
1734                 }
1735                 epos->bh = nbh;
1736         }
1737
1738         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1739
1740         if (!epos->bh) {
1741                 iinfo->i_lenAlloc += adsize;
1742                 mark_inode_dirty(inode);
1743         } else {
1744                 aed = (struct allocExtDesc *)epos->bh->b_data;
1745                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1746                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1747                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1748                         udf_update_tag(epos->bh->b_data,
1749                                         epos->offset + (inc ? 0 : adsize));
1750                 else
1751                         udf_update_tag(epos->bh->b_data,
1752                                         sizeof(struct allocExtDesc));
1753                 mark_buffer_dirty_inode(epos->bh, inode);
1754         }
1755
1756         return etype;
1757 }
1758
1759 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1760                       kernel_lb_addr eloc, uint32_t elen, int inc)
1761 {
1762         int adsize;
1763         uint8_t *ptr;
1764         short_ad *sad;
1765         long_ad *lad;
1766         struct udf_inode_info *iinfo = UDF_I(inode);
1767
1768         if (!epos->bh)
1769                 ptr = iinfo->i_ext.i_data + epos->offset -
1770                         udf_file_entry_alloc_offset(inode) +
1771                         iinfo->i_lenEAttr;
1772         else
1773                 ptr = epos->bh->b_data + epos->offset;
1774
1775         switch (iinfo->i_alloc_type) {
1776         case ICBTAG_FLAG_AD_SHORT:
1777                 sad = (short_ad *)ptr;
1778                 sad->extLength = cpu_to_le32(elen);
1779                 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1780                 adsize = sizeof(short_ad);
1781                 break;
1782         case ICBTAG_FLAG_AD_LONG:
1783                 lad = (long_ad *)ptr;
1784                 lad->extLength = cpu_to_le32(elen);
1785                 lad->extLocation = cpu_to_lelb(eloc);
1786                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1787                 adsize = sizeof(long_ad);
1788                 break;
1789         default:
1790                 return -1;
1791         }
1792
1793         if (epos->bh) {
1794                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1795                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1796                         struct allocExtDesc *aed =
1797                                 (struct allocExtDesc *)epos->bh->b_data;
1798                         udf_update_tag(epos->bh->b_data,
1799                                        le32_to_cpu(aed->lengthAllocDescs) +
1800                                        sizeof(struct allocExtDesc));
1801                 }
1802                 mark_buffer_dirty_inode(epos->bh, inode);
1803         } else {
1804                 mark_inode_dirty(inode);
1805         }
1806
1807         if (inc)
1808                 epos->offset += adsize;
1809
1810         return (elen >> 30);
1811 }
1812
1813 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1814                      kernel_lb_addr *eloc, uint32_t *elen, int inc)
1815 {
1816         int8_t etype;
1817
1818         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1819                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1820                 int block;
1821                 epos->block = *eloc;
1822                 epos->offset = sizeof(struct allocExtDesc);
1823                 brelse(epos->bh);
1824                 block = udf_get_lb_pblock(inode->i_sb, epos->block, 0);
1825                 epos->bh = udf_tread(inode->i_sb, block);
1826                 if (!epos->bh) {
1827                         udf_debug("reading block %d failed!\n", block);
1828                         return -1;
1829                 }
1830         }
1831
1832         return etype;
1833 }
1834
1835 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1836                         kernel_lb_addr *eloc, uint32_t *elen, int inc)
1837 {
1838         int alen;
1839         int8_t etype;
1840         uint8_t *ptr;
1841         short_ad *sad;
1842         long_ad *lad;
1843         struct udf_inode_info *iinfo = UDF_I(inode);
1844
1845         if (!epos->bh) {
1846                 if (!epos->offset)
1847                         epos->offset = udf_file_entry_alloc_offset(inode);
1848                 ptr = iinfo->i_ext.i_data + epos->offset -
1849                         udf_file_entry_alloc_offset(inode) +
1850                         iinfo->i_lenEAttr;
1851                 alen = udf_file_entry_alloc_offset(inode) +
1852                                                         iinfo->i_lenAlloc;
1853         } else {
1854                 if (!epos->offset)
1855                         epos->offset = sizeof(struct allocExtDesc);
1856                 ptr = epos->bh->b_data + epos->offset;
1857                 alen = sizeof(struct allocExtDesc) +
1858                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1859                                                         lengthAllocDescs);
1860         }
1861
1862         switch (iinfo->i_alloc_type) {
1863         case ICBTAG_FLAG_AD_SHORT:
1864                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1865                 if (!sad)
1866                         return -1;
1867                 etype = le32_to_cpu(sad->extLength) >> 30;
1868                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1869                 eloc->partitionReferenceNum =
1870                                 iinfo->i_location.partitionReferenceNum;
1871                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1872                 break;
1873         case ICBTAG_FLAG_AD_LONG:
1874                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1875                 if (!lad)
1876                         return -1;
1877                 etype = le32_to_cpu(lad->extLength) >> 30;
1878                 *eloc = lelb_to_cpu(lad->extLocation);
1879                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1880                 break;
1881         default:
1882                 udf_debug("alloc_type = %d unsupported\n",
1883                                 iinfo->i_alloc_type);
1884                 return -1;
1885         }
1886
1887         return etype;
1888 }
1889
1890 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1891                               kernel_lb_addr neloc, uint32_t nelen)
1892 {
1893         kernel_lb_addr oeloc;
1894         uint32_t oelen;
1895         int8_t etype;
1896
1897         if (epos.bh)
1898                 get_bh(epos.bh);
1899
1900         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1901                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1902                 neloc = oeloc;
1903                 nelen = (etype << 30) | oelen;
1904         }
1905         udf_add_aext(inode, &epos, neloc, nelen, 1);
1906         brelse(epos.bh);
1907
1908         return (nelen >> 30);
1909 }
1910
1911 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1912                        kernel_lb_addr eloc, uint32_t elen)
1913 {
1914         struct extent_position oepos;
1915         int adsize;
1916         int8_t etype;
1917         struct allocExtDesc *aed;
1918         struct udf_inode_info *iinfo;
1919
1920         if (epos.bh) {
1921                 get_bh(epos.bh);
1922                 get_bh(epos.bh);
1923         }
1924
1925         iinfo = UDF_I(inode);
1926         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1927                 adsize = sizeof(short_ad);
1928         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1929                 adsize = sizeof(long_ad);
1930         else
1931                 adsize = 0;
1932
1933         oepos = epos;
1934         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1935                 return -1;
1936
1937         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1938                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1939                 if (oepos.bh != epos.bh) {
1940                         oepos.block = epos.block;
1941                         brelse(oepos.bh);
1942                         get_bh(epos.bh);
1943                         oepos.bh = epos.bh;
1944                         oepos.offset = epos.offset - adsize;
1945                 }
1946         }
1947         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1948         elen = 0;
1949
1950         if (epos.bh != oepos.bh) {
1951                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
1952                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1953                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1954                 if (!oepos.bh) {
1955                         iinfo->i_lenAlloc -= (adsize * 2);
1956                         mark_inode_dirty(inode);
1957                 } else {
1958                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1959                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1960                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1961                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1962                                 udf_update_tag(oepos.bh->b_data,
1963                                                 oepos.offset - (2 * adsize));
1964                         else
1965                                 udf_update_tag(oepos.bh->b_data,
1966                                                 sizeof(struct allocExtDesc));
1967                         mark_buffer_dirty_inode(oepos.bh, inode);
1968                 }
1969         } else {
1970                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1971                 if (!oepos.bh) {
1972                         iinfo->i_lenAlloc -= adsize;
1973                         mark_inode_dirty(inode);
1974                 } else {
1975                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1976                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1977                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1978                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1979                                 udf_update_tag(oepos.bh->b_data,
1980                                                 epos.offset - adsize);
1981                         else
1982                                 udf_update_tag(oepos.bh->b_data,
1983                                                 sizeof(struct allocExtDesc));
1984                         mark_buffer_dirty_inode(oepos.bh, inode);
1985                 }
1986         }
1987
1988         brelse(epos.bh);
1989         brelse(oepos.bh);
1990
1991         return (elen >> 30);
1992 }
1993
1994 int8_t inode_bmap(struct inode *inode, sector_t block,
1995                   struct extent_position *pos, kernel_lb_addr *eloc,
1996                   uint32_t *elen, sector_t *offset)
1997 {
1998         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1999         loff_t lbcount = 0, bcount =
2000             (loff_t) block << blocksize_bits;
2001         int8_t etype;
2002         struct udf_inode_info *iinfo;
2003
2004         iinfo = UDF_I(inode);
2005         pos->offset = 0;
2006         pos->block = iinfo->i_location;
2007         pos->bh = NULL;
2008         *elen = 0;
2009
2010         do {
2011                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2012                 if (etype == -1) {
2013                         *offset = (bcount - lbcount) >> blocksize_bits;
2014                         iinfo->i_lenExtents = lbcount;
2015                         return -1;
2016                 }
2017                 lbcount += *elen;
2018         } while (lbcount <= bcount);
2019
2020         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2021
2022         return etype;
2023 }
2024
2025 long udf_block_map(struct inode *inode, sector_t block)
2026 {
2027         kernel_lb_addr eloc;
2028         uint32_t elen;
2029         sector_t offset;
2030         struct extent_position epos = {};
2031         int ret;
2032
2033         lock_kernel();
2034
2035         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2036                                                 (EXT_RECORDED_ALLOCATED >> 30))
2037                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2038         else
2039                 ret = 0;
2040
2041         unlock_kernel();
2042         brelse(epos.bh);
2043
2044         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2045                 return udf_fixed_to_variable(ret);
2046         else
2047                 return ret;
2048 }