fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/module.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/buffer_head.h>
  38 #include <linux/writeback.h>
  39 #include <linux/slab.h>
  40 #include <linux/crc-itu-t.h>
  41
  42 #include "udf_i.h"
  43 #include "udf_sb.h"
  44
  45 MODULE_AUTHOR("Ben Fennema");
  46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  47 MODULE_LICENSE("GPL");
  48
  49 #define EXTENT_MERGE_SIZE 5
  50
  51 static mode_t udf_convert_permissions(struct fileEntry *);
  52 static int udf_update_inode(struct inode *, int);
  53 static void udf_fill_inode(struct inode *, struct buffer_head *);
  54 static int udf_alloc_i_data(struct inode *inode, size_t size);
  55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  56                                         sector_t *, int *);
  57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  58                               struct kernel_lb_addr, uint32_t);
  59 static void udf_split_extents(struct inode *, int *, int, int,
  60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_prealloc_extents(struct inode *, int, int,
  62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_merge_extents(struct inode *,
  64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  65 static void udf_update_extents(struct inode *,
  66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  67                                struct extent_position *);
  68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  69
  70
  71 void udf_delete_inode(struct inode *inode)
  72 {
  73         truncate_inode_pages(&inode->i_data, 0);
  74
  75         if (is_bad_inode(inode))
  76                 goto no_delete;
  77
  78         inode->i_size = 0;
  79         udf_truncate(inode);
  80         lock_kernel();
  81
  82         udf_update_inode(inode, IS_SYNC(inode));
  83         udf_free_inode(inode);
  84
  85         unlock_kernel();
  86         return;
  87
  88 no_delete:
  89         clear_inode(inode);
  90 }
  91
  92 /*
  93  * If we are going to release inode from memory, we discard preallocation and
  94  * truncate last inode extent to proper length. We could use drop_inode() but
  95  * it's called under inode_lock and thus we cannot mark inode dirty there.  We
  96  * use clear_inode() but we have to make sure to write inode as it's not written
  97  * automatically.
  98  */
  99 void udf_clear_inode(struct inode *inode)
 100 {
 101         struct udf_inode_info *iinfo;
 102         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 103                 lock_kernel();
 104                 /* Discard preallocation for directories, symlinks, etc. */
 105                 udf_discard_prealloc(inode);
 106                 udf_truncate_tail_extent(inode);
 107                 unlock_kernel();
 108                 write_inode_now(inode, 0);
 109                 invalidate_inode_buffers(inode);
 110         }
 111         iinfo = UDF_I(inode);
 112         kfree(iinfo->i_ext.i_data);
 113         iinfo->i_ext.i_data = NULL;
 114 }
 115
 116 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 117 {
 118         return block_write_full_page(page, udf_get_block, wbc);
 119 }
 120
 121 static int udf_readpage(struct file *file, struct page *page)
 122 {
 123         return block_read_full_page(page, udf_get_block);
 124 }
 125
 126 static int udf_write_begin(struct file *file, struct address_space *mapping,
 127                         loff_t pos, unsigned len, unsigned flags,
 128                         struct page **pagep, void **fsdata)
 129 {
 130         *pagep = NULL;
 131         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 132                                 udf_get_block);
 133 }
 134
 135 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 136 {
 137         return generic_block_bmap(mapping, block, udf_get_block);
 138 }
 139
 140 const struct address_space_operations udf_aops = {
 141         .readpage       = udf_readpage,
 142         .writepage      = udf_writepage,
 143         .sync_page      = block_sync_page,
 144         .write_begin            = udf_write_begin,
 145         .write_end              = generic_write_end,
 146         .bmap           = udf_bmap,
 147 };
 148
 149 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 150 {
 151         struct page *page;
 152         char *kaddr;
 153         struct udf_inode_info *iinfo = UDF_I(inode);
 154         struct writeback_control udf_wbc = {
 155                 .sync_mode = WB_SYNC_NONE,
 156                 .nr_to_write = 1,
 157         };
 158
 159         /* from now on we have normal address_space methods */
 160         inode->i_data.a_ops = &udf_aops;
 161
 162         if (!iinfo->i_lenAlloc) {
 163                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 164                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 165                 else
 166                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 167                 mark_inode_dirty(inode);
 168                 return;
 169         }
 170
 171         page = grab_cache_page(inode->i_mapping, 0);
 172         BUG_ON(!PageLocked(page));
 173
 174         if (!PageUptodate(page)) {
 175                 kaddr = kmap(page);
 176                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 177                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 178                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 179                         iinfo->i_lenAlloc);
 180                 flush_dcache_page(page);
 181                 SetPageUptodate(page);
 182                 kunmap(page);
 183         }
 184         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 185                iinfo->i_lenAlloc);
 186         iinfo->i_lenAlloc = 0;
 187         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 188                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 189         else
 190                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 191
 192         inode->i_data.a_ops->writepage(page, &udf_wbc);
 193         page_cache_release(page);
 194
 195         mark_inode_dirty(inode);
 196 }
 197
 198 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 199                                            int *err)
 200 {
 201         int newblock;
 202         struct buffer_head *dbh = NULL;
 203         struct kernel_lb_addr eloc;
 204         uint32_t elen;
 205         uint8_t alloctype;
 206         struct extent_position epos;
 207
 208         struct udf_fileident_bh sfibh, dfibh;
 209         loff_t f_pos = udf_ext0_offset(inode);
 210         int size = udf_ext0_offset(inode) + inode->i_size;
 211         struct fileIdentDesc cfi, *sfi, *dfi;
 212         struct udf_inode_info *iinfo = UDF_I(inode);
 213
 214         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 215                 alloctype = ICBTAG_FLAG_AD_SHORT;
 216         else
 217                 alloctype = ICBTAG_FLAG_AD_LONG;
 218
 219         if (!inode->i_size) {
 220                 iinfo->i_alloc_type = alloctype;
 221                 mark_inode_dirty(inode);
 222                 return NULL;
 223         }
 224
 225         /* alloc block, and copy data to it */
 226         *block = udf_new_block(inode->i_sb, inode,
 227                                iinfo->i_location.partitionReferenceNum,
 228                                iinfo->i_location.logicalBlockNum, err);
 229         if (!(*block))
 230                 return NULL;
 231         newblock = udf_get_pblock(inode->i_sb, *block,
 232                                   iinfo->i_location.partitionReferenceNum,
 233                                 0);
 234         if (!newblock)
 235                 return NULL;
 236         dbh = udf_tgetblk(inode->i_sb, newblock);
 237         if (!dbh)
 238                 return NULL;
 239         lock_buffer(dbh);
 240         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 241         set_buffer_uptodate(dbh);
 242         unlock_buffer(dbh);
 243         mark_buffer_dirty_inode(dbh, inode);
 244
 245         sfibh.soffset = sfibh.eoffset =
 246                         f_pos & (inode->i_sb->s_blocksize - 1);
 247         sfibh.sbh = sfibh.ebh = NULL;
 248         dfibh.soffset = dfibh.eoffset = 0;
 249         dfibh.sbh = dfibh.ebh = dbh;
 250         while (f_pos < size) {
 251                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 252                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 253                                          NULL, NULL, NULL);
 254                 if (!sfi) {
 255                         brelse(dbh);
 256                         return NULL;
 257                 }
 258                 iinfo->i_alloc_type = alloctype;
 259                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 260                 dfibh.soffset = dfibh.eoffset;
 261                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 262                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 263                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 264                                  sfi->fileIdent +
 265                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 266                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 267                         brelse(dbh);
 268                         return NULL;
 269                 }
 270         }
 271         mark_buffer_dirty_inode(dbh, inode);
 272
 273         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 274                 iinfo->i_lenAlloc);
 275         iinfo->i_lenAlloc = 0;
 276         eloc.logicalBlockNum = *block;
 277         eloc.partitionReferenceNum =
 278                                 iinfo->i_location.partitionReferenceNum;
 279         elen = inode->i_sb->s_blocksize;
 280         iinfo->i_lenExtents = elen;
 281         epos.bh = NULL;
 282         epos.block = iinfo->i_location;
 283         epos.offset = udf_file_entry_alloc_offset(inode);
 284         udf_add_aext(inode, &epos, &eloc, elen, 0);
 285         /* UniqueID stuff */
 286
 287         brelse(epos.bh);
 288         mark_inode_dirty(inode);
 289         return dbh;
 290 }
 291
 292 static int udf_get_block(struct inode *inode, sector_t block,
 293                          struct buffer_head *bh_result, int create)
 294 {
 295         int err, new;
 296         struct buffer_head *bh;
 297         sector_t phys = 0;
 298         struct udf_inode_info *iinfo;
 299
 300         if (!create) {
 301                 phys = udf_block_map(inode, block);
 302                 if (phys)
 303                         map_bh(bh_result, inode->i_sb, phys);
 304                 return 0;
 305         }
 306
 307         err = -EIO;
 308         new = 0;
 309         bh = NULL;
 310
 311         lock_kernel();
 312
 313         iinfo = UDF_I(inode);
 314         if (block == iinfo->i_next_alloc_block + 1) {
 315                 iinfo->i_next_alloc_block++;
 316                 iinfo->i_next_alloc_goal++;
 317         }
 318
 319         err = 0;
 320
 321         bh = inode_getblk(inode, block, &err, &phys, &new);
 322         BUG_ON(bh);
 323         if (err)
 324                 goto abort;
 325         BUG_ON(!phys);
 326
 327         if (new)
 328                 set_buffer_new(bh_result);
 329         map_bh(bh_result, inode->i_sb, phys);
 330
 331 abort:
 332         unlock_kernel();
 333         return err;
 334 }
 335
 336 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 337                                       int create, int *err)
 338 {
 339         struct buffer_head *bh;
 340         struct buffer_head dummy;
 341
 342         dummy.b_state = 0;
 343         dummy.b_blocknr = -1000;
 344         *err = udf_get_block(inode, block, &dummy, create);
 345         if (!*err && buffer_mapped(&dummy)) {
 346                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 347                 if (buffer_new(&dummy)) {
 348                         lock_buffer(bh);
 349                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 350                         set_buffer_uptodate(bh);
 351                         unlock_buffer(bh);
 352                         mark_buffer_dirty_inode(bh, inode);
 353                 }
 354                 return bh;
 355         }
 356
 357         return NULL;
 358 }
 359
 360 /* Extend the file by 'blocks' blocks, return the number of extents added */
 361 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 362                     struct kernel_long_ad *last_ext, sector_t blocks)
 363 {
 364         sector_t add;
 365         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 366         struct super_block *sb = inode->i_sb;
 367         struct kernel_lb_addr prealloc_loc = {};
 368         int prealloc_len = 0;
 369         struct udf_inode_info *iinfo;
 370
 371         /* The previous extent is fake and we should not extend by anything
 372          * - there's nothing to do... */
 373         if (!blocks && fake)
 374                 return 0;
 375
 376         iinfo = UDF_I(inode);
 377         /* Round the last extent up to a multiple of block size */
 378         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 379                 last_ext->extLength =
 380                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 381                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 382                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 383                 iinfo->i_lenExtents =
 384                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 385                         ~(sb->s_blocksize - 1);
 386         }
 387
 388         /* Last extent are just preallocated blocks? */
 389         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 390                                                 EXT_NOT_RECORDED_ALLOCATED) {
 391                 /* Save the extent so that we can reattach it to the end */
 392                 prealloc_loc = last_ext->extLocation;
 393                 prealloc_len = last_ext->extLength;
 394                 /* Mark the extent as a hole */
 395                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 396                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 397                 last_ext->extLocation.logicalBlockNum = 0;
 398                 last_ext->extLocation.partitionReferenceNum = 0;
 399         }
 400
 401         /* Can we merge with the previous extent? */
 402         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 403                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 404                 add = ((1 << 30) - sb->s_blocksize -
 405                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 406                         sb->s_blocksize_bits;
 407                 if (add > blocks)
 408                         add = blocks;
 409                 blocks -= add;
 410                 last_ext->extLength += add << sb->s_blocksize_bits;
 411         }
 412
 413         if (fake) {
 414                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 415                              last_ext->extLength, 1);
 416                 count++;
 417         } else
 418                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 419                                 last_ext->extLength, 1);
 420
 421         /* Managed to do everything necessary? */
 422         if (!blocks)
 423                 goto out;
 424
 425         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 426         last_ext->extLocation.logicalBlockNum = 0;
 427         last_ext->extLocation.partitionReferenceNum = 0;
 428         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 429         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 430                                 (add << sb->s_blocksize_bits);
 431
 432         /* Create enough extents to cover the whole hole */
 433         while (blocks > add) {
 434                 blocks -= add;
 435                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
 436                                  last_ext->extLength, 1) == -1)
 437                         return -1;
 438                 count++;
 439         }
 440         if (blocks) {
 441                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 442                         (blocks << sb->s_blocksize_bits);
 443                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
 444                                  last_ext->extLength, 1) == -1)
 445                         return -1;
 446                 count++;
 447         }
 448
 449 out:
 450         /* Do we have some preallocated blocks saved? */
 451         if (prealloc_len) {
 452                 if (udf_add_aext(inode, last_pos, &prealloc_loc,
 453                                  prealloc_len, 1) == -1)
 454                         return -1;
 455                 last_ext->extLocation = prealloc_loc;
 456                 last_ext->extLength = prealloc_len;
 457                 count++;
 458         }
 459
 460         /* last_pos should point to the last written extent... */
 461         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 462                 last_pos->offset -= sizeof(struct short_ad);
 463         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 464                 last_pos->offset -= sizeof(struct long_ad);
 465         else
 466                 return -1;
 467
 468         return count;
 469 }
 470
 471 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 472                                         int *err, sector_t *phys, int *new)
 473 {
 474         static sector_t last_block;
 475         struct buffer_head *result = NULL;
 476         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 477         struct extent_position prev_epos, cur_epos, next_epos;
 478         int count = 0, startnum = 0, endnum = 0;
 479         uint32_t elen = 0, tmpelen;
 480         struct kernel_lb_addr eloc, tmpeloc;
 481         int c = 1;
 482         loff_t lbcount = 0, b_off = 0;
 483         uint32_t newblocknum, newblock;
 484         sector_t offset = 0;
 485         int8_t etype;
 486         struct udf_inode_info *iinfo = UDF_I(inode);
 487         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 488         int lastblock = 0;
 489
 490         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 491         prev_epos.block = iinfo->i_location;
 492         prev_epos.bh = NULL;
 493         cur_epos = next_epos = prev_epos;
 494         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 495
 496         /* find the extent which contains the block we are looking for.
 497            alternate between laarr[0] and laarr[1] for locations of the
 498            current extent, and the previous extent */
 499         do {
 500                 if (prev_epos.bh != cur_epos.bh) {
 501                         brelse(prev_epos.bh);
 502                         get_bh(cur_epos.bh);
 503                         prev_epos.bh = cur_epos.bh;
 504                 }
 505                 if (cur_epos.bh != next_epos.bh) {
 506                         brelse(cur_epos.bh);
 507                         get_bh(next_epos.bh);
 508                         cur_epos.bh = next_epos.bh;
 509                 }
 510
 511                 lbcount += elen;
 512
 513                 prev_epos.block = cur_epos.block;
 514                 cur_epos.block = next_epos.block;
 515
 516                 prev_epos.offset = cur_epos.offset;
 517                 cur_epos.offset = next_epos.offset;
 518
 519                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 520                 if (etype == -1)
 521                         break;
 522
 523                 c = !c;
 524
 525                 laarr[c].extLength = (etype << 30) | elen;
 526                 laarr[c].extLocation = eloc;
 527
 528                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 529                         pgoal = eloc.logicalBlockNum +
 530                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 531                                  inode->i_sb->s_blocksize_bits);
 532
 533                 count++;
 534         } while (lbcount + elen <= b_off);
 535
 536         b_off -= lbcount;
 537         offset = b_off >> inode->i_sb->s_blocksize_bits;
 538         /*
 539          * Move prev_epos and cur_epos into indirect extent if we are at
 540          * the pointer to it
 541          */
 542         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 543         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 544
 545         /* if the extent is allocated and recorded, return the block
 546            if the extent is not a multiple of the blocksize, round up */
 547
 548         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 549                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 550                         elen = EXT_RECORDED_ALLOCATED |
 551                                 ((elen + inode->i_sb->s_blocksize - 1) &
 552                                  ~(inode->i_sb->s_blocksize - 1));
 553                         etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 554                 }
 555                 brelse(prev_epos.bh);
 556                 brelse(cur_epos.bh);
 557                 brelse(next_epos.bh);
 558                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 559                 *phys = newblock;
 560                 return NULL;
 561         }
 562
 563         last_block = block;
 564         /* Are we beyond EOF? */
 565         if (etype == -1) {
 566                 int ret;
 567
 568                 if (count) {
 569                         if (c)
 570                                 laarr[0] = laarr[1];
 571                         startnum = 1;
 572                 } else {
 573                         /* Create a fake extent when there's not one */
 574                         memset(&laarr[0].extLocation, 0x00,
 575                                 sizeof(struct kernel_lb_addr));
 576                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 577                         /* Will udf_extend_file() create real extent from
 578                            a fake one? */
 579                         startnum = (offset > 0);
 580                 }
 581                 /* Create extents for the hole between EOF and offset */
 582                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 583                 if (ret == -1) {
 584                         brelse(prev_epos.bh);
 585                         brelse(cur_epos.bh);
 586                         brelse(next_epos.bh);
 587                         /* We don't really know the error here so we just make
 588                          * something up */
 589                         *err = -ENOSPC;
 590                         return NULL;
 591                 }
 592                 c = 0;
 593                 offset = 0;
 594                 count += ret;
 595                 /* We are not covered by a preallocated extent? */
 596                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 597                                                 EXT_NOT_RECORDED_ALLOCATED) {
 598                         /* Is there any real extent? - otherwise we overwrite
 599                          * the fake one... */
 600                         if (count)
 601                                 c = !c;
 602                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 603                                 inode->i_sb->s_blocksize;
 604                         memset(&laarr[c].extLocation, 0x00,
 605                                 sizeof(struct kernel_lb_addr));
 606                         count++;
 607                         endnum++;
 608                 }
 609                 endnum = c + 1;
 610                 lastblock = 1;
 611         } else {
 612                 endnum = startnum = ((count > 2) ? 2 : count);
 613
 614                 /* if the current extent is in position 0,
 615                    swap it with the previous */
 616                 if (!c && count != 1) {
 617                         laarr[2] = laarr[0];
 618                         laarr[0] = laarr[1];
 619                         laarr[1] = laarr[2];
 620                         c = 1;
 621                 }
 622
 623                 /* if the current block is located in an extent,
 624                    read the next extent */
 625                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 626                 if (etype != -1) {
 627                         laarr[c + 1].extLength = (etype << 30) | elen;
 628                         laarr[c + 1].extLocation = eloc;
 629                         count++;
 630                         startnum++;
 631                         endnum++;
 632                 } else
 633                         lastblock = 1;
 634         }
 635
 636         /* if the current extent is not recorded but allocated, get the
 637          * block in the extent corresponding to the requested block */
 638         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 639                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 640         else { /* otherwise, allocate a new block */
 641                 if (iinfo->i_next_alloc_block == block)
 642                         goal = iinfo->i_next_alloc_goal;
 643
 644                 if (!goal) {
 645                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 646                                 goal = iinfo->i_location.logicalBlockNum + 1;
 647                 }
 648
 649                 newblocknum = udf_new_block(inode->i_sb, inode,
 650                                 iinfo->i_location.partitionReferenceNum,
 651                                 goal, err);
 652                 if (!newblocknum) {
 653                         brelse(prev_epos.bh);
 654                         *err = -ENOSPC;
 655                         return NULL;
 656                 }
 657                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 658         }
 659
 660         /* if the extent the requsted block is located in contains multiple
 661          * blocks, split the extent into at most three extents. blocks prior
 662          * to requested block, requested block, and blocks after requested
 663          * block */
 664         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 665
 666 #ifdef UDF_PREALLOCATE
 667         /* preallocate blocks */
 668         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 669 #endif
 670
 671         /* merge any continuous blocks in laarr */
 672         udf_merge_extents(inode, laarr, &endnum);
 673
 674         /* write back the new extents, inserting new extents if the new number
 675          * of extents is greater than the old number, and deleting extents if
 676          * the new number of extents is less than the old number */
 677         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 678
 679         brelse(prev_epos.bh);
 680
 681         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 682                                 iinfo->i_location.partitionReferenceNum, 0);
 683         if (!newblock)
 684                 return NULL;
 685         *phys = newblock;
 686         *err = 0;
 687         *new = 1;
 688         iinfo->i_next_alloc_block = block;
 689         iinfo->i_next_alloc_goal = newblocknum;
 690         inode->i_ctime = current_fs_time(inode->i_sb);
 691
 692         if (IS_SYNC(inode))
 693                 udf_sync_inode(inode);
 694         else
 695                 mark_inode_dirty(inode);
 696
 697         return result;
 698 }
 699
 700 static void udf_split_extents(struct inode *inode, int *c, int offset,
 701                               int newblocknum,
 702                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 703                               int *endnum)
 704 {
 705         unsigned long blocksize = inode->i_sb->s_blocksize;
 706         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 707
 708         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 709             (laarr[*c].extLength >> 30) ==
 710                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 711                 int curr = *c;
 712                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 713                             blocksize - 1) >> blocksize_bits;
 714                 int8_t etype = (laarr[curr].extLength >> 30);
 715
 716                 if (blen == 1)
 717                         ;
 718                 else if (!offset || blen == offset + 1) {
 719                         laarr[curr + 2] = laarr[curr + 1];
 720                         laarr[curr + 1] = laarr[curr];
 721                 } else {
 722                         laarr[curr + 3] = laarr[curr + 1];
 723                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 724                 }
 725
 726                 if (offset) {
 727                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 728                                 udf_free_blocks(inode->i_sb, inode,
 729                                                 &laarr[curr].extLocation,
 730                                                 0, offset);
 731                                 laarr[curr].extLength =
 732                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 733                                         (offset << blocksize_bits);
 734                                 laarr[curr].extLocation.logicalBlockNum = 0;
 735                                 laarr[curr].extLocation.
 736                                                 partitionReferenceNum = 0;
 737                         } else
 738                                 laarr[curr].extLength = (etype << 30) |
 739                                         (offset << blocksize_bits);
 740                         curr++;
 741                         (*c)++;
 742                         (*endnum)++;
 743                 }
 744
 745                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 746                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 747                         laarr[curr].extLocation.partitionReferenceNum =
 748                                 UDF_I(inode)->i_location.partitionReferenceNum;
 749                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 750                         blocksize;
 751                 curr++;
 752
 753                 if (blen != offset + 1) {
 754                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 755                                 laarr[curr].extLocation.logicalBlockNum +=
 756                                                                 offset + 1;
 757                         laarr[curr].extLength = (etype << 30) |
 758                                 ((blen - (offset + 1)) << blocksize_bits);
 759                         curr++;
 760                         (*endnum)++;
 761                 }
 762         }
 763 }
 764
 765 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 766                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 767                                  int *endnum)
 768 {
 769         int start, length = 0, currlength = 0, i;
 770
 771         if (*endnum >= (c + 1)) {
 772                 if (!lastblock)
 773                         return;
 774                 else
 775                         start = c;
 776         } else {
 777                 if ((laarr[c + 1].extLength >> 30) ==
 778                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 779                         start = c + 1;
 780                         length = currlength =
 781                                 (((laarr[c + 1].extLength &
 782                                         UDF_EXTENT_LENGTH_MASK) +
 783                                 inode->i_sb->s_blocksize - 1) >>
 784                                 inode->i_sb->s_blocksize_bits);
 785                 } else
 786                         start = c;
 787         }
 788
 789         for (i = start + 1; i <= *endnum; i++) {
 790                 if (i == *endnum) {
 791                         if (lastblock)
 792                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 793                 } else if ((laarr[i].extLength >> 30) ==
 794                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 795                         length += (((laarr[i].extLength &
 796                                                 UDF_EXTENT_LENGTH_MASK) +
 797                                     inode->i_sb->s_blocksize - 1) >>
 798                                     inode->i_sb->s_blocksize_bits);
 799                 } else
 800                         break;
 801         }
 802
 803         if (length) {
 804                 int next = laarr[start].extLocation.logicalBlockNum +
 805                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 806                           inode->i_sb->s_blocksize - 1) >>
 807                           inode->i_sb->s_blocksize_bits);
 808                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 809                                 laarr[start].extLocation.partitionReferenceNum,
 810                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 811                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 812                                 currlength);
 813                 if (numalloc)   {
 814                         if (start == (c + 1))
 815                                 laarr[start].extLength +=
 816                                         (numalloc <<
 817                                          inode->i_sb->s_blocksize_bits);
 818                         else {
 819                                 memmove(&laarr[c + 2], &laarr[c + 1],
 820                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 821                                 (*endnum)++;
 822                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 823                                 laarr[c + 1].extLocation.partitionReferenceNum =
 824                                         laarr[c].extLocation.
 825                                                         partitionReferenceNum;
 826                                 laarr[c + 1].extLength =
 827                                         EXT_NOT_RECORDED_ALLOCATED |
 828                                         (numalloc <<
 829                                          inode->i_sb->s_blocksize_bits);
 830                                 start = c + 1;
 831                         }
 832
 833                         for (i = start + 1; numalloc && i < *endnum; i++) {
 834                                 int elen = ((laarr[i].extLength &
 835                                                 UDF_EXTENT_LENGTH_MASK) +
 836                                             inode->i_sb->s_blocksize - 1) >>
 837                                             inode->i_sb->s_blocksize_bits;
 838
 839                                 if (elen > numalloc) {
 840                                         laarr[i].extLength -=
 841                                                 (numalloc <<
 842                                                  inode->i_sb->s_blocksize_bits);
 843                                         numalloc = 0;
 844                                 } else {
 845                                         numalloc -= elen;
 846                                         if (*endnum > (i + 1))
 847                                                 memmove(&laarr[i],
 848                                                         &laarr[i + 1],
 849                                                         sizeof(struct long_ad) *
 850                                                         (*endnum - (i + 1)));
 851                                         i--;
 852                                         (*endnum)--;
 853                                 }
 854                         }
 855                         UDF_I(inode)->i_lenExtents +=
 856                                 numalloc << inode->i_sb->s_blocksize_bits;
 857                 }
 858         }
 859 }
 860
 861 static void udf_merge_extents(struct inode *inode,
 862                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 863                               int *endnum)
 864 {
 865         int i;
 866         unsigned long blocksize = inode->i_sb->s_blocksize;
 867         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 868
 869         for (i = 0; i < (*endnum - 1); i++) {
 870                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 871                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 872
 873                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 874                         (((li->extLength >> 30) ==
 875                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 876                         ((lip1->extLocation.logicalBlockNum -
 877                           li->extLocation.logicalBlockNum) ==
 878                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 879                         blocksize - 1) >> blocksize_bits)))) {
 880
 881                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 882                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 883                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 884                                 lip1->extLength = (lip1->extLength -
 885                                                   (li->extLength &
 886                                                    UDF_EXTENT_LENGTH_MASK) +
 887                                                    UDF_EXTENT_LENGTH_MASK) &
 888                                                         ~(blocksize - 1);
 889                                 li->extLength = (li->extLength &
 890                                                  UDF_EXTENT_FLAG_MASK) +
 891                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 892                                                 blocksize;
 893                                 lip1->extLocation.logicalBlockNum =
 894                                         li->extLocation.logicalBlockNum +
 895                                         ((li->extLength &
 896                                                 UDF_EXTENT_LENGTH_MASK) >>
 897                                                 blocksize_bits);
 898                         } else {
 899                                 li->extLength = lip1->extLength +
 900                                         (((li->extLength &
 901                                                 UDF_EXTENT_LENGTH_MASK) +
 902                                          blocksize - 1) & ~(blocksize - 1));
 903                                 if (*endnum > (i + 2))
 904                                         memmove(&laarr[i + 1], &laarr[i + 2],
 905                                                 sizeof(struct long_ad) *
 906                                                 (*endnum - (i + 2)));
 907                                 i--;
 908                                 (*endnum)--;
 909                         }
 910                 } else if (((li->extLength >> 30) ==
 911                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 912                            ((lip1->extLength >> 30) ==
 913                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 914                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
 915                                         ((li->extLength &
 916                                           UDF_EXTENT_LENGTH_MASK) +
 917                                          blocksize - 1) >> blocksize_bits);
 918                         li->extLocation.logicalBlockNum = 0;
 919                         li->extLocation.partitionReferenceNum = 0;
 920
 921                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 922                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 923                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 924                                 lip1->extLength = (lip1->extLength -
 925                                                    (li->extLength &
 926                                                    UDF_EXTENT_LENGTH_MASK) +
 927                                                    UDF_EXTENT_LENGTH_MASK) &
 928                                                    ~(blocksize - 1);
 929                                 li->extLength = (li->extLength &
 930                                                  UDF_EXTENT_FLAG_MASK) +
 931                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 932                                                 blocksize;
 933                         } else {
 934                                 li->extLength = lip1->extLength +
 935                                         (((li->extLength &
 936                                                 UDF_EXTENT_LENGTH_MASK) +
 937                                           blocksize - 1) & ~(blocksize - 1));
 938                                 if (*endnum > (i + 2))
 939                                         memmove(&laarr[i + 1], &laarr[i + 2],
 940                                                 sizeof(struct long_ad) *
 941                                                 (*endnum - (i + 2)));
 942                                 i--;
 943                                 (*endnum)--;
 944                         }
 945                 } else if ((li->extLength >> 30) ==
 946                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 947                         udf_free_blocks(inode->i_sb, inode,
 948                                         &li->extLocation, 0,
 949                                         ((li->extLength &
 950                                                 UDF_EXTENT_LENGTH_MASK) +
 951                                          blocksize - 1) >> blocksize_bits);
 952                         li->extLocation.logicalBlockNum = 0;
 953                         li->extLocation.partitionReferenceNum = 0;
 954                         li->extLength = (li->extLength &
 955                                                 UDF_EXTENT_LENGTH_MASK) |
 956                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 957                 }
 958         }
 959 }
 960
 961 static void udf_update_extents(struct inode *inode,
 962                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 963                                int startnum, int endnum,
 964                                struct extent_position *epos)
 965 {
 966         int start = 0, i;
 967         struct kernel_lb_addr tmploc;
 968         uint32_t tmplen;
 969
 970         if (startnum > endnum) {
 971                 for (i = 0; i < (startnum - endnum); i++)
 972                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 973                                         laarr[i].extLength);
 974         } else if (startnum < endnum) {
 975                 for (i = 0; i < (endnum - startnum); i++) {
 976                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 977                                         laarr[i].extLength);
 978                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 979                                       &laarr[i].extLength, 1);
 980                         start++;
 981                 }
 982         }
 983
 984         for (i = start; i < endnum; i++) {
 985                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 986                 udf_write_aext(inode, epos, &laarr[i].extLocation,
 987                                laarr[i].extLength, 1);
 988         }
 989 }
 990
 991 struct buffer_head *udf_bread(struct inode *inode, int block,
 992                               int create, int *err)
 993 {
 994         struct buffer_head *bh = NULL;
 995
 996         bh = udf_getblk(inode, block, create, err);
 997         if (!bh)
 998                 return NULL;
 999
1000         if (buffer_uptodate(bh))
1001                 return bh;
1002
1003         ll_rw_block(READ, 1, &bh);
1004
1005         wait_on_buffer(bh);
1006         if (buffer_uptodate(bh))
1007                 return bh;
1008
1009         brelse(bh);
1010         *err = -EIO;
1011         return NULL;
1012 }
1013
1014 void udf_truncate(struct inode *inode)
1015 {
1016         int offset;
1017         int err;
1018         struct udf_inode_info *iinfo;
1019
1020         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1021               S_ISLNK(inode->i_mode)))
1022                 return;
1023         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1024                 return;
1025
1026         lock_kernel();
1027         iinfo = UDF_I(inode);
1028         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1029                 if (inode->i_sb->s_blocksize <
1030                                 (udf_file_entry_alloc_offset(inode) +
1031                                  inode->i_size)) {
1032                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1033                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1034                                 inode->i_size = iinfo->i_lenAlloc;
1035                                 unlock_kernel();
1036                                 return;
1037                         } else
1038                                 udf_truncate_extents(inode);
1039                 } else {
1040                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1041                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1042                                 0x00, inode->i_sb->s_blocksize -
1043                                 offset - udf_file_entry_alloc_offset(inode));
1044                         iinfo->i_lenAlloc = inode->i_size;
1045                 }
1046         } else {
1047                 block_truncate_page(inode->i_mapping, inode->i_size,
1048                                     udf_get_block);
1049                 udf_truncate_extents(inode);
1050         }
1051
1052         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1053         if (IS_SYNC(inode))
1054                 udf_sync_inode(inode);
1055         else
1056                 mark_inode_dirty(inode);
1057         unlock_kernel();
1058 }
1059
1060 static void __udf_read_inode(struct inode *inode)
1061 {
1062         struct buffer_head *bh = NULL;
1063         struct fileEntry *fe;
1064         uint16_t ident;
1065         struct udf_inode_info *iinfo = UDF_I(inode);
1066
1067         /*
1068          * Set defaults, but the inode is still incomplete!
1069          * Note: get_new_inode() sets the following on a new inode:
1070          *      i_sb = sb
1071          *      i_no = ino
1072          *      i_flags = sb->s_flags
1073          *      i_state = 0
1074          * clean_inode(): zero fills and sets
1075          *      i_count = 1
1076          *      i_nlink = 1
1077          *      i_op = NULL;
1078          */
1079         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1080         if (!bh) {
1081                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1082                        inode->i_ino);
1083                 make_bad_inode(inode);
1084                 return;
1085         }
1086
1087         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1088             ident != TAG_IDENT_USE) {
1089                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1090                                 "failed ident=%d\n", inode->i_ino, ident);
1091                 brelse(bh);
1092                 make_bad_inode(inode);
1093                 return;
1094         }
1095
1096         fe = (struct fileEntry *)bh->b_data;
1097
1098         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1099                 struct buffer_head *ibh;
1100
1101                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1102                                         &ident);
1103                 if (ident == TAG_IDENT_IE && ibh) {
1104                         struct buffer_head *nbh = NULL;
1105                         struct kernel_lb_addr loc;
1106                         struct indirectEntry *ie;
1107
1108                         ie = (struct indirectEntry *)ibh->b_data;
1109                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1110
1111                         if (ie->indirectICB.extLength &&
1112                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1113                                                         &ident))) {
1114                                 if (ident == TAG_IDENT_FE ||
1115                                         ident == TAG_IDENT_EFE) {
1116                                         memcpy(&iinfo->i_location,
1117                                                 &loc,
1118                                                 sizeof(struct kernel_lb_addr));
1119                                         brelse(bh);
1120                                         brelse(ibh);
1121                                         brelse(nbh);
1122                                         __udf_read_inode(inode);
1123                                         return;
1124                                 }
1125                                 brelse(nbh);
1126                         }
1127                 }
1128                 brelse(ibh);
1129         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1130                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1131                        le16_to_cpu(fe->icbTag.strategyType));
1132                 brelse(bh);
1133                 make_bad_inode(inode);
1134                 return;
1135         }
1136         udf_fill_inode(inode, bh);
1137
1138         brelse(bh);
1139 }
1140
1141 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1142 {
1143         struct fileEntry *fe;
1144         struct extendedFileEntry *efe;
1145         int offset;
1146         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1147         struct udf_inode_info *iinfo = UDF_I(inode);
1148
1149         fe = (struct fileEntry *)bh->b_data;
1150         efe = (struct extendedFileEntry *)bh->b_data;
1151
1152         if (fe->icbTag.strategyType == cpu_to_le16(4))
1153                 iinfo->i_strat4096 = 0;
1154         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1155                 iinfo->i_strat4096 = 1;
1156
1157         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1158                                                         ICBTAG_FLAG_AD_MASK;
1159         iinfo->i_unique = 0;
1160         iinfo->i_lenEAttr = 0;
1161         iinfo->i_lenExtents = 0;
1162         iinfo->i_lenAlloc = 0;
1163         iinfo->i_next_alloc_block = 0;
1164         iinfo->i_next_alloc_goal = 0;
1165         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1166                 iinfo->i_efe = 1;
1167                 iinfo->i_use = 0;
1168                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1169                                         sizeof(struct extendedFileEntry))) {
1170                         make_bad_inode(inode);
1171                         return;
1172                 }
1173                 memcpy(iinfo->i_ext.i_data,
1174                        bh->b_data + sizeof(struct extendedFileEntry),
1175                        inode->i_sb->s_blocksize -
1176                                         sizeof(struct extendedFileEntry));
1177         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1178                 iinfo->i_efe = 0;
1179                 iinfo->i_use = 0;
1180                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1181                                                 sizeof(struct fileEntry))) {
1182                         make_bad_inode(inode);
1183                         return;
1184                 }
1185                 memcpy(iinfo->i_ext.i_data,
1186                        bh->b_data + sizeof(struct fileEntry),
1187                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1188         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1189                 iinfo->i_efe = 0;
1190                 iinfo->i_use = 1;
1191                 iinfo->i_lenAlloc = le32_to_cpu(
1192                                 ((struct unallocSpaceEntry *)bh->b_data)->
1193                                  lengthAllocDescs);
1194                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1195                                         sizeof(struct unallocSpaceEntry))) {
1196                         make_bad_inode(inode);
1197                         return;
1198                 }
1199                 memcpy(iinfo->i_ext.i_data,
1200                        bh->b_data + sizeof(struct unallocSpaceEntry),
1201                        inode->i_sb->s_blocksize -
1202                                         sizeof(struct unallocSpaceEntry));
1203                 return;
1204         }
1205
1206         inode->i_uid = le32_to_cpu(fe->uid);
1207         if (inode->i_uid == -1 ||
1208             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1209             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1210                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1211
1212         inode->i_gid = le32_to_cpu(fe->gid);
1213         if (inode->i_gid == -1 ||
1214             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1215             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1216                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1217
1218         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1219         if (!inode->i_nlink)
1220                 inode->i_nlink = 1;
1221
1222         inode->i_size = le64_to_cpu(fe->informationLength);
1223         iinfo->i_lenExtents = inode->i_size;
1224
1225         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1226                         sbi->s_fmode != UDF_INVALID_MODE)
1227                 inode->i_mode = sbi->s_fmode;
1228         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1229                         sbi->s_dmode != UDF_INVALID_MODE)
1230                 inode->i_mode = sbi->s_dmode;
1231         else
1232                 inode->i_mode = udf_convert_permissions(fe);
1233         inode->i_mode &= ~sbi->s_umask;
1234
1235         if (iinfo->i_efe == 0) {
1236                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1237                         (inode->i_sb->s_blocksize_bits - 9);
1238
1239                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1240                         inode->i_atime = sbi->s_record_time;
1241
1242                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1243                                             fe->modificationTime))
1244                         inode->i_mtime = sbi->s_record_time;
1245
1246                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1247                         inode->i_ctime = sbi->s_record_time;
1248
1249                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1250                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1251                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1252                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1253         } else {
1254                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1255                     (inode->i_sb->s_blocksize_bits - 9);
1256
1257                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1258                         inode->i_atime = sbi->s_record_time;
1259
1260                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1261                                             efe->modificationTime))
1262                         inode->i_mtime = sbi->s_record_time;
1263
1264                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1265                         iinfo->i_crtime = sbi->s_record_time;
1266
1267                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1268                         inode->i_ctime = sbi->s_record_time;
1269
1270                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1271                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1272                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1273                 offset = sizeof(struct extendedFileEntry) +
1274                                                         iinfo->i_lenEAttr;
1275         }
1276
1277         switch (fe->icbTag.fileType) {
1278         case ICBTAG_FILE_TYPE_DIRECTORY:
1279                 inode->i_op = &udf_dir_inode_operations;
1280                 inode->i_fop = &udf_dir_operations;
1281                 inode->i_mode |= S_IFDIR;
1282                 inc_nlink(inode);
1283                 break;
1284         case ICBTAG_FILE_TYPE_REALTIME:
1285         case ICBTAG_FILE_TYPE_REGULAR:
1286         case ICBTAG_FILE_TYPE_UNDEF:
1287         case ICBTAG_FILE_TYPE_VAT20:
1288                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1289                         inode->i_data.a_ops = &udf_adinicb_aops;
1290                 else
1291                         inode->i_data.a_ops = &udf_aops;
1292                 inode->i_op = &udf_file_inode_operations;
1293                 inode->i_fop = &udf_file_operations;
1294                 inode->i_mode |= S_IFREG;
1295                 break;
1296         case ICBTAG_FILE_TYPE_BLOCK:
1297                 inode->i_mode |= S_IFBLK;
1298                 break;
1299         case ICBTAG_FILE_TYPE_CHAR:
1300                 inode->i_mode |= S_IFCHR;
1301                 break;
1302         case ICBTAG_FILE_TYPE_FIFO:
1303                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1304                 break;
1305         case ICBTAG_FILE_TYPE_SOCKET:
1306                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1307                 break;
1308         case ICBTAG_FILE_TYPE_SYMLINK:
1309                 inode->i_data.a_ops = &udf_symlink_aops;
1310                 inode->i_op = &page_symlink_inode_operations;
1311                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1312                 break;
1313         case ICBTAG_FILE_TYPE_MAIN:
1314                 udf_debug("METADATA FILE-----\n");
1315                 break;
1316         case ICBTAG_FILE_TYPE_MIRROR:
1317                 udf_debug("METADATA MIRROR FILE-----\n");
1318                 break;
1319         case ICBTAG_FILE_TYPE_BITMAP:
1320                 udf_debug("METADATA BITMAP FILE-----\n");
1321                 break;
1322         default:
1323                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1324                                 "file type=%d\n", inode->i_ino,
1325                                 fe->icbTag.fileType);
1326                 make_bad_inode(inode);
1327                 return;
1328         }
1329         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1330                 struct deviceSpec *dsea =
1331                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1332                 if (dsea) {
1333                         init_special_inode(inode, inode->i_mode,
1334                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1335                                       le32_to_cpu(dsea->minorDeviceIdent)));
1336                         /* Developer ID ??? */
1337                 } else
1338                         make_bad_inode(inode);
1339         }
1340 }
1341
1342 static int udf_alloc_i_data(struct inode *inode, size_t size)
1343 {
1344         struct udf_inode_info *iinfo = UDF_I(inode);
1345         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1346
1347         if (!iinfo->i_ext.i_data) {
1348                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1349                                 "no free memory\n", inode->i_ino);
1350                 return -ENOMEM;
1351         }
1352
1353         return 0;
1354 }
1355
1356 static mode_t udf_convert_permissions(struct fileEntry *fe)
1357 {
1358         mode_t mode;
1359         uint32_t permissions;
1360         uint32_t flags;
1361
1362         permissions = le32_to_cpu(fe->permissions);
1363         flags = le16_to_cpu(fe->icbTag.flags);
1364
1365         mode =  ((permissions) & S_IRWXO) |
1366                 ((permissions >> 2) & S_IRWXG) |
1367                 ((permissions >> 4) & S_IRWXU) |
1368                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1369                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1370                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1371
1372         return mode;
1373 }
1374
1375 int udf_write_inode(struct inode *inode, int sync)
1376 {
1377         int ret;
1378
1379         lock_kernel();
1380         ret = udf_update_inode(inode, sync);
1381         unlock_kernel();
1382
1383         return ret;
1384 }
1385
1386 int udf_sync_inode(struct inode *inode)
1387 {
1388         return udf_update_inode(inode, 1);
1389 }
1390
1391 static int udf_update_inode(struct inode *inode, int do_sync)
1392 {
1393         struct buffer_head *bh = NULL;
1394         struct fileEntry *fe;
1395         struct extendedFileEntry *efe;
1396         uint32_t udfperms;
1397         uint16_t icbflags;
1398         uint16_t crclen;
1399         int err = 0;
1400         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1401         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1402         struct udf_inode_info *iinfo = UDF_I(inode);
1403
1404         bh = udf_tread(inode->i_sb,
1405                         udf_get_lb_pblock(inode->i_sb,
1406                                           &iinfo->i_location, 0));
1407         if (!bh) {
1408                 udf_debug("bread failure\n");
1409                 return -EIO;
1410         }
1411
1412         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1413
1414         fe = (struct fileEntry *)bh->b_data;
1415         efe = (struct extendedFileEntry *)bh->b_data;
1416
1417         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1418                 struct unallocSpaceEntry *use =
1419                         (struct unallocSpaceEntry *)bh->b_data;
1420
1421                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1422                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1423                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1424                                         sizeof(struct unallocSpaceEntry));
1425                 crclen = sizeof(struct unallocSpaceEntry) +
1426                                 iinfo->i_lenAlloc - sizeof(struct tag);
1427                 use->descTag.tagLocation = cpu_to_le32(
1428                                                 iinfo->i_location.
1429                                                         logicalBlockNum);
1430                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1431                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1432                                                            sizeof(struct tag),
1433                                                            crclen));
1434                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1435
1436                 mark_buffer_dirty(bh);
1437                 brelse(bh);
1438                 return err;
1439         }
1440
1441         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1442                 fe->uid = cpu_to_le32(-1);
1443         else
1444                 fe->uid = cpu_to_le32(inode->i_uid);
1445
1446         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1447                 fe->gid = cpu_to_le32(-1);
1448         else
1449                 fe->gid = cpu_to_le32(inode->i_gid);
1450
1451         udfperms = ((inode->i_mode & S_IRWXO)) |
1452                    ((inode->i_mode & S_IRWXG) << 2) |
1453                    ((inode->i_mode & S_IRWXU) << 4);
1454
1455         udfperms |= (le32_to_cpu(fe->permissions) &
1456                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1457                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1458                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1459         fe->permissions = cpu_to_le32(udfperms);
1460
1461         if (S_ISDIR(inode->i_mode))
1462                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1463         else
1464                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1465
1466         fe->informationLength = cpu_to_le64(inode->i_size);
1467
1468         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1469                 struct regid *eid;
1470                 struct deviceSpec *dsea =
1471                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1472                 if (!dsea) {
1473                         dsea = (struct deviceSpec *)
1474                                 udf_add_extendedattr(inode,
1475                                                      sizeof(struct deviceSpec) +
1476                                                      sizeof(struct regid), 12, 0x3);
1477                         dsea->attrType = cpu_to_le32(12);
1478                         dsea->attrSubtype = 1;
1479                         dsea->attrLength = cpu_to_le32(
1480                                                 sizeof(struct deviceSpec) +
1481                                                 sizeof(struct regid));
1482                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1483                 }
1484                 eid = (struct regid *)dsea->impUse;
1485                 memset(eid, 0, sizeof(struct regid));
1486                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1487                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1488                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1489                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1490                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1491         }
1492
1493         if (iinfo->i_efe == 0) {
1494                 memcpy(bh->b_data + sizeof(struct fileEntry),
1495                        iinfo->i_ext.i_data,
1496                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1497                 fe->logicalBlocksRecorded = cpu_to_le64(
1498                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1499                         (blocksize_bits - 9));
1500
1501                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1502                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1503                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1504                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1505                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1506                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1507                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1508                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1509                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1510                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1511                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1512                 crclen = sizeof(struct fileEntry);
1513         } else {
1514                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1515                        iinfo->i_ext.i_data,
1516                        inode->i_sb->s_blocksize -
1517                                         sizeof(struct extendedFileEntry));
1518                 efe->objectSize = cpu_to_le64(inode->i_size);
1519                 efe->logicalBlocksRecorded = cpu_to_le64(
1520                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1521                         (blocksize_bits - 9));
1522
1523                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1524                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1525                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1526                         iinfo->i_crtime = inode->i_atime;
1527
1528                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1529                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1530                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1531                         iinfo->i_crtime = inode->i_mtime;
1532
1533                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1534                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1535                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1536                         iinfo->i_crtime = inode->i_ctime;
1537
1538                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1539                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1540                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1541                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1542
1543                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1544                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1545                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1546                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1547                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1548                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1549                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1550                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1551                 crclen = sizeof(struct extendedFileEntry);
1552         }
1553         if (iinfo->i_strat4096) {
1554                 fe->icbTag.strategyType = cpu_to_le16(4096);
1555                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1556                 fe->icbTag.numEntries = cpu_to_le16(2);
1557         } else {
1558                 fe->icbTag.strategyType = cpu_to_le16(4);
1559                 fe->icbTag.numEntries = cpu_to_le16(1);
1560         }
1561
1562         if (S_ISDIR(inode->i_mode))
1563                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1564         else if (S_ISREG(inode->i_mode))
1565                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1566         else if (S_ISLNK(inode->i_mode))
1567                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1568         else if (S_ISBLK(inode->i_mode))
1569                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1570         else if (S_ISCHR(inode->i_mode))
1571                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1572         else if (S_ISFIFO(inode->i_mode))
1573                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1574         else if (S_ISSOCK(inode->i_mode))
1575                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1576
1577         icbflags =      iinfo->i_alloc_type |
1578                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1579                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1580                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1581                         (le16_to_cpu(fe->icbTag.flags) &
1582                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1583                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1584
1585         fe->icbTag.flags = cpu_to_le16(icbflags);
1586         if (sbi->s_udfrev >= 0x0200)
1587                 fe->descTag.descVersion = cpu_to_le16(3);
1588         else
1589                 fe->descTag.descVersion = cpu_to_le16(2);
1590         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1591         fe->descTag.tagLocation = cpu_to_le32(
1592                                         iinfo->i_location.logicalBlockNum);
1593         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1594                                                                 sizeof(struct tag);
1595         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1596         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1597                                                   crclen));
1598         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1599
1600         /* write the data blocks */
1601         mark_buffer_dirty(bh);
1602         if (do_sync) {
1603                 sync_dirty_buffer(bh);
1604                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1605                         printk(KERN_WARNING "IO error syncing udf inode "
1606                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1607                                 inode->i_ino);
1608                         err = -EIO;
1609                 }
1610         }
1611         brelse(bh);
1612
1613         return err;
1614 }
1615
1616 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1617 {
1618         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1619         struct inode *inode = iget_locked(sb, block);
1620
1621         if (!inode)
1622                 return NULL;
1623
1624         if (inode->i_state & I_NEW) {
1625                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1626                 __udf_read_inode(inode);
1627                 unlock_new_inode(inode);
1628         }
1629
1630         if (is_bad_inode(inode))
1631                 goto out_iput;
1632
1633         if (ino->logicalBlockNum >= UDF_SB(sb)->
1634                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1635                 udf_debug("block=%d, partition=%d out of range\n",
1636                           ino->logicalBlockNum, ino->partitionReferenceNum);
1637                 make_bad_inode(inode);
1638                 goto out_iput;
1639         }
1640
1641         return inode;
1642
1643  out_iput:
1644         iput(inode);
1645         return NULL;
1646 }
1647
1648 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1649                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1650 {
1651         int adsize;
1652         struct short_ad *sad = NULL;
1653         struct long_ad *lad = NULL;
1654         struct allocExtDesc *aed;
1655         int8_t etype;
1656         uint8_t *ptr;
1657         struct udf_inode_info *iinfo = UDF_I(inode);
1658
1659         if (!epos->bh)
1660                 ptr = iinfo->i_ext.i_data + epos->offset -
1661                         udf_file_entry_alloc_offset(inode) +
1662                         iinfo->i_lenEAttr;
1663         else
1664                 ptr = epos->bh->b_data + epos->offset;
1665
1666         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1667                 adsize = sizeof(struct short_ad);
1668         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1669                 adsize = sizeof(struct long_ad);
1670         else
1671                 return -1;
1672
1673         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1674                 char *sptr, *dptr;
1675                 struct buffer_head *nbh;
1676                 int err, loffset;
1677                 struct kernel_lb_addr obloc = epos->block;
1678
1679                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1680                                                 obloc.partitionReferenceNum,
1681                                                 obloc.logicalBlockNum, &err);
1682                 if (!epos->block.logicalBlockNum)
1683                         return -1;
1684                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1685                                                                  &epos->block,
1686                                                                  0));
1687                 if (!nbh)
1688                         return -1;
1689                 lock_buffer(nbh);
1690                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1691                 set_buffer_uptodate(nbh);
1692                 unlock_buffer(nbh);
1693                 mark_buffer_dirty_inode(nbh, inode);
1694
1695                 aed = (struct allocExtDesc *)(nbh->b_data);
1696                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1697                         aed->previousAllocExtLocation =
1698                                         cpu_to_le32(obloc.logicalBlockNum);
1699                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1700                         loffset = epos->offset;
1701                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1702                         sptr = ptr - adsize;
1703                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1704                         memcpy(dptr, sptr, adsize);
1705                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1706                 } else {
1707                         loffset = epos->offset + adsize;
1708                         aed->lengthAllocDescs = cpu_to_le32(0);
1709                         sptr = ptr;
1710                         epos->offset = sizeof(struct allocExtDesc);
1711
1712                         if (epos->bh) {
1713                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1714                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1715                         } else {
1716                                 iinfo->i_lenAlloc += adsize;
1717                                 mark_inode_dirty(inode);
1718                         }
1719                 }
1720                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1721                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1722                                     epos->block.logicalBlockNum, sizeof(struct tag));
1723                 else
1724                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1725                                     epos->block.logicalBlockNum, sizeof(struct tag));
1726                 switch (iinfo->i_alloc_type) {
1727                 case ICBTAG_FLAG_AD_SHORT:
1728                         sad = (struct short_ad *)sptr;
1729                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1730                                                      inode->i_sb->s_blocksize);
1731                         sad->extPosition =
1732                                 cpu_to_le32(epos->block.logicalBlockNum);
1733                         break;
1734                 case ICBTAG_FLAG_AD_LONG:
1735                         lad = (struct long_ad *)sptr;
1736                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1737                                                      inode->i_sb->s_blocksize);
1738                         lad->extLocation = cpu_to_lelb(epos->block);
1739                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1740                         break;
1741                 }
1742                 if (epos->bh) {
1743                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1744                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1745                                 udf_update_tag(epos->bh->b_data, loffset);
1746                         else
1747                                 udf_update_tag(epos->bh->b_data,
1748                                                 sizeof(struct allocExtDesc));
1749                         mark_buffer_dirty_inode(epos->bh, inode);
1750                         brelse(epos->bh);
1751                 } else {
1752                         mark_inode_dirty(inode);
1753                 }
1754                 epos->bh = nbh;
1755         }
1756
1757         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1758
1759         if (!epos->bh) {
1760                 iinfo->i_lenAlloc += adsize;
1761                 mark_inode_dirty(inode);
1762         } else {
1763                 aed = (struct allocExtDesc *)epos->bh->b_data;
1764                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1765                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1766                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1767                         udf_update_tag(epos->bh->b_data,
1768                                         epos->offset + (inc ? 0 : adsize));
1769                 else
1770                         udf_update_tag(epos->bh->b_data,
1771                                         sizeof(struct allocExtDesc));
1772                 mark_buffer_dirty_inode(epos->bh, inode);
1773         }
1774
1775         return etype;
1776 }
1777
1778 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1779                       struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1780 {
1781         int adsize;
1782         uint8_t *ptr;
1783         struct short_ad *sad;
1784         struct long_ad *lad;
1785         struct udf_inode_info *iinfo = UDF_I(inode);
1786
1787         if (!epos->bh)
1788                 ptr = iinfo->i_ext.i_data + epos->offset -
1789                         udf_file_entry_alloc_offset(inode) +
1790                         iinfo->i_lenEAttr;
1791         else
1792                 ptr = epos->bh->b_data + epos->offset;
1793
1794         switch (iinfo->i_alloc_type) {
1795         case ICBTAG_FLAG_AD_SHORT:
1796                 sad = (struct short_ad *)ptr;
1797                 sad->extLength = cpu_to_le32(elen);
1798                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1799                 adsize = sizeof(struct short_ad);
1800                 break;
1801         case ICBTAG_FLAG_AD_LONG:
1802                 lad = (struct long_ad *)ptr;
1803                 lad->extLength = cpu_to_le32(elen);
1804                 lad->extLocation = cpu_to_lelb(*eloc);
1805                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1806                 adsize = sizeof(struct long_ad);
1807                 break;
1808         default:
1809                 return -1;
1810         }
1811
1812         if (epos->bh) {
1813                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1814                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1815                         struct allocExtDesc *aed =
1816                                 (struct allocExtDesc *)epos->bh->b_data;
1817                         udf_update_tag(epos->bh->b_data,
1818                                        le32_to_cpu(aed->lengthAllocDescs) +
1819                                        sizeof(struct allocExtDesc));
1820                 }
1821                 mark_buffer_dirty_inode(epos->bh, inode);
1822         } else {
1823                 mark_inode_dirty(inode);
1824         }
1825
1826         if (inc)
1827                 epos->offset += adsize;
1828
1829         return (elen >> 30);
1830 }
1831
1832 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1833                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1834 {
1835         int8_t etype;
1836
1837         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1838                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1839                 int block;
1840                 epos->block = *eloc;
1841                 epos->offset = sizeof(struct allocExtDesc);
1842                 brelse(epos->bh);
1843                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1844                 epos->bh = udf_tread(inode->i_sb, block);
1845                 if (!epos->bh) {
1846                         udf_debug("reading block %d failed!\n", block);
1847                         return -1;
1848                 }
1849         }
1850
1851         return etype;
1852 }
1853
1854 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1855                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1856 {
1857         int alen;
1858         int8_t etype;
1859         uint8_t *ptr;
1860         struct short_ad *sad;
1861         struct long_ad *lad;
1862         struct udf_inode_info *iinfo = UDF_I(inode);
1863
1864         if (!epos->bh) {
1865                 if (!epos->offset)
1866                         epos->offset = udf_file_entry_alloc_offset(inode);
1867                 ptr = iinfo->i_ext.i_data + epos->offset -
1868                         udf_file_entry_alloc_offset(inode) +
1869                         iinfo->i_lenEAttr;
1870                 alen = udf_file_entry_alloc_offset(inode) +
1871                                                         iinfo->i_lenAlloc;
1872         } else {
1873                 if (!epos->offset)
1874                         epos->offset = sizeof(struct allocExtDesc);
1875                 ptr = epos->bh->b_data + epos->offset;
1876                 alen = sizeof(struct allocExtDesc) +
1877                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1878                                                         lengthAllocDescs);
1879         }
1880
1881         switch (iinfo->i_alloc_type) {
1882         case ICBTAG_FLAG_AD_SHORT:
1883                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1884                 if (!sad)
1885                         return -1;
1886                 etype = le32_to_cpu(sad->extLength) >> 30;
1887                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1888                 eloc->partitionReferenceNum =
1889                                 iinfo->i_location.partitionReferenceNum;
1890                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1891                 break;
1892         case ICBTAG_FLAG_AD_LONG:
1893                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1894                 if (!lad)
1895                         return -1;
1896                 etype = le32_to_cpu(lad->extLength) >> 30;
1897                 *eloc = lelb_to_cpu(lad->extLocation);
1898                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1899                 break;
1900         default:
1901                 udf_debug("alloc_type = %d unsupported\n",
1902                                 iinfo->i_alloc_type);
1903                 return -1;
1904         }
1905
1906         return etype;
1907 }
1908
1909 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1910                               struct kernel_lb_addr neloc, uint32_t nelen)
1911 {
1912         struct kernel_lb_addr oeloc;
1913         uint32_t oelen;
1914         int8_t etype;
1915
1916         if (epos.bh)
1917                 get_bh(epos.bh);
1918
1919         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1920                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1921                 neloc = oeloc;
1922                 nelen = (etype << 30) | oelen;
1923         }
1924         udf_add_aext(inode, &epos, &neloc, nelen, 1);
1925         brelse(epos.bh);
1926
1927         return (nelen >> 30);
1928 }
1929
1930 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1931                        struct kernel_lb_addr eloc, uint32_t elen)
1932 {
1933         struct extent_position oepos;
1934         int adsize;
1935         int8_t etype;
1936         struct allocExtDesc *aed;
1937         struct udf_inode_info *iinfo;
1938
1939         if (epos.bh) {
1940                 get_bh(epos.bh);
1941                 get_bh(epos.bh);
1942         }
1943
1944         iinfo = UDF_I(inode);
1945         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1946                 adsize = sizeof(struct short_ad);
1947         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1948                 adsize = sizeof(struct long_ad);
1949         else
1950                 adsize = 0;
1951
1952         oepos = epos;
1953         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1954                 return -1;
1955
1956         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1957                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
1958                 if (oepos.bh != epos.bh) {
1959                         oepos.block = epos.block;
1960                         brelse(oepos.bh);
1961                         get_bh(epos.bh);
1962                         oepos.bh = epos.bh;
1963                         oepos.offset = epos.offset - adsize;
1964                 }
1965         }
1966         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1967         elen = 0;
1968
1969         if (epos.bh != oepos.bh) {
1970                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
1971                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1972                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1973                 if (!oepos.bh) {
1974                         iinfo->i_lenAlloc -= (adsize * 2);
1975                         mark_inode_dirty(inode);
1976                 } else {
1977                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1978                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1979                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1980                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1981                                 udf_update_tag(oepos.bh->b_data,
1982                                                 oepos.offset - (2 * adsize));
1983                         else
1984                                 udf_update_tag(oepos.bh->b_data,
1985                                                 sizeof(struct allocExtDesc));
1986                         mark_buffer_dirty_inode(oepos.bh, inode);
1987                 }
1988         } else {
1989                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1990                 if (!oepos.bh) {
1991                         iinfo->i_lenAlloc -= adsize;
1992                         mark_inode_dirty(inode);
1993                 } else {
1994                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1995                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1996                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1997                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1998                                 udf_update_tag(oepos.bh->b_data,
1999                                                 epos.offset - adsize);
2000                         else
2001                                 udf_update_tag(oepos.bh->b_data,
2002                                                 sizeof(struct allocExtDesc));
2003                         mark_buffer_dirty_inode(oepos.bh, inode);
2004                 }
2005         }
2006
2007         brelse(epos.bh);
2008         brelse(oepos.bh);
2009
2010         return (elen >> 30);
2011 }
2012
2013 int8_t inode_bmap(struct inode *inode, sector_t block,
2014                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2015                   uint32_t *elen, sector_t *offset)
2016 {
2017         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2018         loff_t lbcount = 0, bcount =
2019             (loff_t) block << blocksize_bits;
2020         int8_t etype;
2021         struct udf_inode_info *iinfo;
2022
2023         iinfo = UDF_I(inode);
2024         pos->offset = 0;
2025         pos->block = iinfo->i_location;
2026         pos->bh = NULL;
2027         *elen = 0;
2028
2029         do {
2030                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2031                 if (etype == -1) {
2032                         *offset = (bcount - lbcount) >> blocksize_bits;
2033                         iinfo->i_lenExtents = lbcount;
2034                         return -1;
2035                 }
2036                 lbcount += *elen;
2037         } while (lbcount <= bcount);
2038
2039         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2040
2041         return etype;
2042 }
2043
2044 long udf_block_map(struct inode *inode, sector_t block)
2045 {
2046         struct kernel_lb_addr eloc;
2047         uint32_t elen;
2048         sector_t offset;
2049         struct extent_position epos = {};
2050         int ret;
2051
2052         lock_kernel();
2053
2054         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2055                                                 (EXT_RECORDED_ALLOCATED >> 30))
2056                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2057         else
2058                 ret = 0;
2059
2060         unlock_kernel();
2061         brelse(epos.bh);
2062
2063         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2064                 return udf_fixed_to_variable(ret);
2065         else
2066                 return ret;
2067 }