git.oblomov.eu Git - linux-2.6/blob - 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                               kernel_lb_addr, uint32_t);
  59 static void udf_split_extents(struct inode *, int *, int, int,
  60                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_prealloc_extents(struct inode *, int, int,
  62                                  kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_merge_extents(struct inode *,
  64                               kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  65 static void udf_update_extents(struct inode *,
  66                                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         }
 110         iinfo = UDF_I(inode);
 111         kfree(iinfo->i_ext.i_data);
 112         iinfo->i_ext.i_data = NULL;
 113 }
 114
 115 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 116 {
 117         return block_write_full_page(page, udf_get_block, wbc);
 118 }
 119
 120 static int udf_readpage(struct file *file, struct page *page)
 121 {
 122         return block_read_full_page(page, udf_get_block);
 123 }
 124
 125 static int udf_write_begin(struct file *file, struct address_space *mapping,
 126                         loff_t pos, unsigned len, unsigned flags,
 127                         struct page **pagep, void **fsdata)
 128 {
 129         *pagep = NULL;
 130         return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 131                                 udf_get_block);
 132 }
 133
 134 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 135 {
 136         return generic_block_bmap(mapping, block, udf_get_block);
 137 }
 138
 139 const struct address_space_operations udf_aops = {
 140         .readpage       = udf_readpage,
 141         .writepage      = udf_writepage,
 142         .sync_page      = block_sync_page,
 143         .write_begin            = udf_write_begin,
 144         .write_end              = generic_write_end,
 145         .bmap           = udf_bmap,
 146 };
 147
 148 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 149 {
 150         struct page *page;
 151         char *kaddr;
 152         struct udf_inode_info *iinfo = UDF_I(inode);
 153         struct writeback_control udf_wbc = {
 154                 .sync_mode = WB_SYNC_NONE,
 155                 .nr_to_write = 1,
 156         };
 157
 158         /* from now on we have normal address_space methods */
 159         inode->i_data.a_ops = &udf_aops;
 160
 161         if (!iinfo->i_lenAlloc) {
 162                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 163                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 164                 else
 165                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 166                 mark_inode_dirty(inode);
 167                 return;
 168         }
 169
 170         page = grab_cache_page(inode->i_mapping, 0);
 171         BUG_ON(!PageLocked(page));
 172
 173         if (!PageUptodate(page)) {
 174                 kaddr = kmap(page);
 175                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 176                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 177                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 178                         iinfo->i_lenAlloc);
 179                 flush_dcache_page(page);
 180                 SetPageUptodate(page);
 181                 kunmap(page);
 182         }
 183         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 184                iinfo->i_lenAlloc);
 185         iinfo->i_lenAlloc = 0;
 186         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 187                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 188         else
 189                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 190
 191         inode->i_data.a_ops->writepage(page, &udf_wbc);
 192         page_cache_release(page);
 193
 194         mark_inode_dirty(inode);
 195 }
 196
 197 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 198                                            int *err)
 199 {
 200         int newblock;
 201         struct buffer_head *dbh = NULL;
 202         kernel_lb_addr eloc;
 203         uint32_t elen;
 204         uint8_t alloctype;
 205         struct extent_position epos;
 206
 207         struct udf_fileident_bh sfibh, dfibh;
 208         loff_t f_pos = udf_ext0_offset(inode);
 209         int size = udf_ext0_offset(inode) + inode->i_size;
 210         struct fileIdentDesc cfi, *sfi, *dfi;
 211         struct udf_inode_info *iinfo = UDF_I(inode);
 212
 213         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 214                 alloctype = ICBTAG_FLAG_AD_SHORT;
 215         else
 216                 alloctype = ICBTAG_FLAG_AD_LONG;
 217
 218         if (!inode->i_size) {
 219                 iinfo->i_alloc_type = alloctype;
 220                 mark_inode_dirty(inode);
 221                 return NULL;
 222         }
 223
 224         /* alloc block, and copy data to it */
 225         *block = udf_new_block(inode->i_sb, inode,
 226                                iinfo->i_location.partitionReferenceNum,
 227                                iinfo->i_location.logicalBlockNum, err);
 228         if (!(*block))
 229                 return NULL;
 230         newblock = udf_get_pblock(inode->i_sb, *block,
 231                                   iinfo->i_location.partitionReferenceNum,
 232                                 0);
 233         if (!newblock)
 234                 return NULL;
 235         dbh = udf_tgetblk(inode->i_sb, newblock);
 236         if (!dbh)
 237                 return NULL;
 238         lock_buffer(dbh);
 239         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 240         set_buffer_uptodate(dbh);
 241         unlock_buffer(dbh);
 242         mark_buffer_dirty_inode(dbh, inode);
 243
 244         sfibh.soffset = sfibh.eoffset =
 245                         f_pos & (inode->i_sb->s_blocksize - 1);
 246         sfibh.sbh = sfibh.ebh = NULL;
 247         dfibh.soffset = dfibh.eoffset = 0;
 248         dfibh.sbh = dfibh.ebh = dbh;
 249         while (f_pos < size) {
 250                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 251                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 252                                          NULL, NULL, NULL);
 253                 if (!sfi) {
 254                         brelse(dbh);
 255                         return NULL;
 256                 }
 257                 iinfo->i_alloc_type = alloctype;
 258                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 259                 dfibh.soffset = dfibh.eoffset;
 260                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 261                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 262                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 263                                  sfi->fileIdent +
 264                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 265                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 266                         brelse(dbh);
 267                         return NULL;
 268                 }
 269         }
 270         mark_buffer_dirty_inode(dbh, inode);
 271
 272         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 273                 iinfo->i_lenAlloc);
 274         iinfo->i_lenAlloc = 0;
 275         eloc.logicalBlockNum = *block;
 276         eloc.partitionReferenceNum =
 277                                 iinfo->i_location.partitionReferenceNum;
 278         elen = inode->i_sb->s_blocksize;
 279         iinfo->i_lenExtents = elen;
 280         epos.bh = NULL;
 281         epos.block = iinfo->i_location;
 282         epos.offset = udf_file_entry_alloc_offset(inode);
 283         udf_add_aext(inode, &epos, eloc, elen, 0);
 284         /* UniqueID stuff */
 285
 286         brelse(epos.bh);
 287         mark_inode_dirty(inode);
 288         return dbh;
 289 }
 290
 291 static int udf_get_block(struct inode *inode, sector_t block,
 292                          struct buffer_head *bh_result, int create)
 293 {
 294         int err, new;
 295         struct buffer_head *bh;
 296         sector_t phys = 0;
 297         struct udf_inode_info *iinfo;
 298
 299         if (!create) {
 300                 phys = udf_block_map(inode, block);
 301                 if (phys)
 302                         map_bh(bh_result, inode->i_sb, phys);
 303                 return 0;
 304         }
 305
 306         err = -EIO;
 307         new = 0;
 308         bh = NULL;
 309
 310         lock_kernel();
 311
 312         iinfo = UDF_I(inode);
 313         if (block == iinfo->i_next_alloc_block + 1) {
 314                 iinfo->i_next_alloc_block++;
 315                 iinfo->i_next_alloc_goal++;
 316         }
 317
 318         err = 0;
 319
 320         bh = inode_getblk(inode, block, &err, &phys, &new);
 321         BUG_ON(bh);
 322         if (err)
 323                 goto abort;
 324         BUG_ON(!phys);
 325
 326         if (new)
 327                 set_buffer_new(bh_result);
 328         map_bh(bh_result, inode->i_sb, phys);
 329
 330 abort:
 331         unlock_kernel();
 332         return err;
 333 }
 334
 335 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 336                                       int create, int *err)
 337 {
 338         struct buffer_head *bh;
 339         struct buffer_head dummy;
 340
 341         dummy.b_state = 0;
 342         dummy.b_blocknr = -1000;
 343         *err = udf_get_block(inode, block, &dummy, create);
 344         if (!*err && buffer_mapped(&dummy)) {
 345                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 346                 if (buffer_new(&dummy)) {
 347                         lock_buffer(bh);
 348                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 349                         set_buffer_uptodate(bh);
 350                         unlock_buffer(bh);
 351                         mark_buffer_dirty_inode(bh, inode);
 352                 }
 353                 return bh;
 354         }
 355
 356         return NULL;
 357 }
 358
 359 /* Extend the file by 'blocks' blocks, return the number of extents added */
 360 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 361                     kernel_long_ad *last_ext, sector_t blocks)
 362 {
 363         sector_t add;
 364         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 365         struct super_block *sb = inode->i_sb;
 366         kernel_lb_addr prealloc_loc = {};
 367         int prealloc_len = 0;
 368         struct udf_inode_info *iinfo;
 369
 370         /* The previous extent is fake and we should not extend by anything
 371          * - there's nothing to do... */
 372         if (!blocks && fake)
 373                 return 0;
 374
 375         iinfo = UDF_I(inode);
 376         /* Round the last extent up to a multiple of block size */
 377         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 378                 last_ext->extLength =
 379                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 380                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 381                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 382                 iinfo->i_lenExtents =
 383                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 384                         ~(sb->s_blocksize - 1);
 385         }
 386
 387         /* Last extent are just preallocated blocks? */
 388         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 389                                                 EXT_NOT_RECORDED_ALLOCATED) {
 390                 /* Save the extent so that we can reattach it to the end */
 391                 prealloc_loc = last_ext->extLocation;
 392                 prealloc_len = last_ext->extLength;
 393                 /* Mark the extent as a hole */
 394                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 395                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 396                 last_ext->extLocation.logicalBlockNum = 0;
 397                 last_ext->extLocation.partitionReferenceNum = 0;
 398         }
 399
 400         /* Can we merge with the previous extent? */
 401         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 402                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 403                 add = ((1 << 30) - sb->s_blocksize -
 404                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 405                         sb->s_blocksize_bits;
 406                 if (add > blocks)
 407                         add = blocks;
 408                 blocks -= add;
 409                 last_ext->extLength += add << sb->s_blocksize_bits;
 410         }
 411
 412         if (fake) {
 413                 udf_add_aext(inode, last_pos, last_ext->extLocation,
 414                              last_ext->extLength, 1);
 415                 count++;
 416         } else
 417                 udf_write_aext(inode, last_pos, last_ext->extLocation,
 418                                 last_ext->extLength, 1);
 419
 420         /* Managed to do everything necessary? */
 421         if (!blocks)
 422                 goto out;
 423
 424         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 425         last_ext->extLocation.logicalBlockNum = 0;
 426         last_ext->extLocation.partitionReferenceNum = 0;
 427         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 428         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 429                                 (add << sb->s_blocksize_bits);
 430
 431         /* Create enough extents to cover the whole hole */
 432         while (blocks > add) {
 433                 blocks -= add;
 434                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 435                                  last_ext->extLength, 1) == -1)
 436                         return -1;
 437                 count++;
 438         }
 439         if (blocks) {
 440                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 441                         (blocks << sb->s_blocksize_bits);
 442                 if (udf_add_aext(inode, last_pos, last_ext->extLocation,
 443                                  last_ext->extLength, 1) == -1)
 444                         return -1;
 445                 count++;
 446         }
 447
 448 out:
 449         /* Do we have some preallocated blocks saved? */
 450         if (prealloc_len) {
 451                 if (udf_add_aext(inode, last_pos, prealloc_loc,
 452                                  prealloc_len, 1) == -1)
 453                         return -1;
 454                 last_ext->extLocation = prealloc_loc;
 455                 last_ext->extLength = prealloc_len;
 456                 count++;
 457         }
 458
 459         /* last_pos should point to the last written extent... */
 460         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 461                 last_pos->offset -= sizeof(short_ad);
 462         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 463                 last_pos->offset -= sizeof(long_ad);
 464         else
 465                 return -1;
 466
 467         return count;
 468 }
 469
 470 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 471                                         int *err, sector_t *phys, int *new)
 472 {
 473         static sector_t last_block;
 474         struct buffer_head *result = NULL;
 475         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 476         struct extent_position prev_epos, cur_epos, next_epos;
 477         int count = 0, startnum = 0, endnum = 0;
 478         uint32_t elen = 0, tmpelen;
 479         kernel_lb_addr eloc, tmpeloc;
 480         int c = 1;
 481         loff_t lbcount = 0, b_off = 0;
 482         uint32_t newblocknum, newblock;
 483         sector_t offset = 0;
 484         int8_t etype;
 485         struct udf_inode_info *iinfo = UDF_I(inode);
 486         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 487         int lastblock = 0;
 488
 489         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 490         prev_epos.block = iinfo->i_location;
 491         prev_epos.bh = NULL;
 492         cur_epos = next_epos = prev_epos;
 493         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 494
 495         /* find the extent which contains the block we are looking for.
 496            alternate between laarr[0] and laarr[1] for locations of the
 497            current extent, and the previous extent */
 498         do {
 499                 if (prev_epos.bh != cur_epos.bh) {
 500                         brelse(prev_epos.bh);
 501                         get_bh(cur_epos.bh);
 502                         prev_epos.bh = cur_epos.bh;
 503                 }
 504                 if (cur_epos.bh != next_epos.bh) {
 505                         brelse(cur_epos.bh);
 506                         get_bh(next_epos.bh);
 507                         cur_epos.bh = next_epos.bh;
 508                 }
 509
 510                 lbcount += elen;
 511
 512                 prev_epos.block = cur_epos.block;
 513                 cur_epos.block = next_epos.block;
 514
 515                 prev_epos.offset = cur_epos.offset;
 516                 cur_epos.offset = next_epos.offset;
 517
 518                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 519                 if (etype == -1)
 520                         break;
 521
 522                 c = !c;
 523
 524                 laarr[c].extLength = (etype << 30) | elen;
 525                 laarr[c].extLocation = eloc;
 526
 527                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 528                         pgoal = eloc.logicalBlockNum +
 529                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 530                                  inode->i_sb->s_blocksize_bits);
 531
 532                 count++;
 533         } while (lbcount + elen <= b_off);
 534
 535         b_off -= lbcount;
 536         offset = b_off >> inode->i_sb->s_blocksize_bits;
 537         /*
 538          * Move prev_epos and cur_epos into indirect extent if we are at
 539          * the pointer to it
 540          */
 541         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 542         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 543
 544         /* if the extent is allocated and recorded, return the block
 545            if the extent is not a multiple of the blocksize, round up */
 546
 547         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 548                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 549                         elen = EXT_RECORDED_ALLOCATED |
 550                                 ((elen + inode->i_sb->s_blocksize - 1) &
 551                                  ~(inode->i_sb->s_blocksize - 1));
 552                         etype = udf_write_aext(inode, &cur_epos, eloc, elen, 1);
 553                 }
 554                 brelse(prev_epos.bh);
 555                 brelse(cur_epos.bh);
 556                 brelse(next_epos.bh);
 557                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 558                 *phys = newblock;
 559                 return NULL;
 560         }
 561
 562         last_block = block;
 563         /* Are we beyond EOF? */
 564         if (etype == -1) {
 565                 int ret;
 566
 567                 if (count) {
 568                         if (c)
 569                                 laarr[0] = laarr[1];
 570                         startnum = 1;
 571                 } else {
 572                         /* Create a fake extent when there's not one */
 573                         memset(&laarr[0].extLocation, 0x00,
 574                                 sizeof(kernel_lb_addr));
 575                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 576                         /* Will udf_extend_file() create real extent from
 577                            a fake one? */
 578                         startnum = (offset > 0);
 579                 }
 580                 /* Create extents for the hole between EOF and offset */
 581                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 582                 if (ret == -1) {
 583                         brelse(prev_epos.bh);
 584                         brelse(cur_epos.bh);
 585                         brelse(next_epos.bh);
 586                         /* We don't really know the error here so we just make
 587                          * something up */
 588                         *err = -ENOSPC;
 589                         return NULL;
 590                 }
 591                 c = 0;
 592                 offset = 0;
 593                 count += ret;
 594                 /* We are not covered by a preallocated extent? */
 595                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 596                                                 EXT_NOT_RECORDED_ALLOCATED) {
 597                         /* Is there any real extent? - otherwise we overwrite
 598                          * the fake one... */
 599                         if (count)
 600                                 c = !c;
 601                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 602                                 inode->i_sb->s_blocksize;
 603                         memset(&laarr[c].extLocation, 0x00,
 604                                 sizeof(kernel_lb_addr));
 605                         count++;
 606                         endnum++;
 607                 }
 608                 endnum = c + 1;
 609                 lastblock = 1;
 610         } else {
 611                 endnum = startnum = ((count > 2) ? 2 : count);
 612
 613                 /* if the current extent is in position 0,
 614                    swap it with the previous */
 615                 if (!c && count != 1) {
 616                         laarr[2] = laarr[0];
 617                         laarr[0] = laarr[1];
 618                         laarr[1] = laarr[2];
 619                         c = 1;
 620                 }
 621
 622                 /* if the current block is located in an extent,
 623                    read the next extent */
 624                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 625                 if (etype != -1) {
 626                         laarr[c + 1].extLength = (etype << 30) | elen;
 627                         laarr[c + 1].extLocation = eloc;
 628                         count++;
 629                         startnum++;
 630                         endnum++;
 631                 } else
 632                         lastblock = 1;
 633         }
 634
 635         /* if the current extent is not recorded but allocated, get the
 636          * block in the extent corresponding to the requested block */
 637         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 638                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 639         else { /* otherwise, allocate a new block */
 640                 if (iinfo->i_next_alloc_block == block)
 641                         goal = iinfo->i_next_alloc_goal;
 642
 643                 if (!goal) {
 644                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 645                                 goal = iinfo->i_location.logicalBlockNum + 1;
 646                 }
 647
 648                 newblocknum = udf_new_block(inode->i_sb, inode,
 649                                 iinfo->i_location.partitionReferenceNum,
 650                                 goal, err);
 651                 if (!newblocknum) {
 652                         brelse(prev_epos.bh);
 653                         *err = -ENOSPC;
 654                         return NULL;
 655                 }
 656                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 657         }
 658
 659         /* if the extent the requsted block is located in contains multiple
 660          * blocks, split the extent into at most three extents. blocks prior
 661          * to requested block, requested block, and blocks after requested
 662          * block */
 663         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 664
 665 #ifdef UDF_PREALLOCATE
 666         /* preallocate blocks */
 667         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 668 #endif
 669
 670         /* merge any continuous blocks in laarr */
 671         udf_merge_extents(inode, laarr, &endnum);
 672
 673         /* write back the new extents, inserting new extents if the new number
 674          * of extents is greater than the old number, and deleting extents if
 675          * the new number of extents is less than the old number */
 676         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 677
 678         brelse(prev_epos.bh);
 679
 680         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 681                                 iinfo->i_location.partitionReferenceNum, 0);
 682         if (!newblock)
 683                 return NULL;
 684         *phys = newblock;
 685         *err = 0;
 686         *new = 1;
 687         iinfo->i_next_alloc_block = block;
 688         iinfo->i_next_alloc_goal = newblocknum;
 689         inode->i_ctime = current_fs_time(inode->i_sb);
 690
 691         if (IS_SYNC(inode))
 692                 udf_sync_inode(inode);
 693         else
 694                 mark_inode_dirty(inode);
 695
 696         return result;
 697 }
 698
 699 static void udf_split_extents(struct inode *inode, int *c, int offset,
 700                               int newblocknum,
 701                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 702                               int *endnum)
 703 {
 704         unsigned long blocksize = inode->i_sb->s_blocksize;
 705         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 706
 707         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 708             (laarr[*c].extLength >> 30) ==
 709                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 710                 int curr = *c;
 711                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 712                             blocksize - 1) >> blocksize_bits;
 713                 int8_t etype = (laarr[curr].extLength >> 30);
 714
 715                 if (blen == 1)
 716                         ;
 717                 else if (!offset || blen == offset + 1) {
 718                         laarr[curr + 2] = laarr[curr + 1];
 719                         laarr[curr + 1] = laarr[curr];
 720                 } else {
 721                         laarr[curr + 3] = laarr[curr + 1];
 722                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 723                 }
 724
 725                 if (offset) {
 726                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 727                                 udf_free_blocks(inode->i_sb, inode,
 728                                                 laarr[curr].extLocation,
 729                                                 0, offset);
 730                                 laarr[curr].extLength =
 731                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 732                                         (offset << blocksize_bits);
 733                                 laarr[curr].extLocation.logicalBlockNum = 0;
 734                                 laarr[curr].extLocation.
 735                                                 partitionReferenceNum = 0;
 736                         } else
 737                                 laarr[curr].extLength = (etype << 30) |
 738                                         (offset << blocksize_bits);
 739                         curr++;
 740                         (*c)++;
 741                         (*endnum)++;
 742                 }
 743
 744                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 745                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 746                         laarr[curr].extLocation.partitionReferenceNum =
 747                                 UDF_I(inode)->i_location.partitionReferenceNum;
 748                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 749                         blocksize;
 750                 curr++;
 751
 752                 if (blen != offset + 1) {
 753                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 754                                 laarr[curr].extLocation.logicalBlockNum +=
 755                                                                 offset + 1;
 756                         laarr[curr].extLength = (etype << 30) |
 757                                 ((blen - (offset + 1)) << blocksize_bits);
 758                         curr++;
 759                         (*endnum)++;
 760                 }
 761         }
 762 }
 763
 764 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 765                                  kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 766                                  int *endnum)
 767 {
 768         int start, length = 0, currlength = 0, i;
 769
 770         if (*endnum >= (c + 1)) {
 771                 if (!lastblock)
 772                         return;
 773                 else
 774                         start = c;
 775         } else {
 776                 if ((laarr[c + 1].extLength >> 30) ==
 777                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 778                         start = c + 1;
 779                         length = currlength =
 780                                 (((laarr[c + 1].extLength &
 781                                         UDF_EXTENT_LENGTH_MASK) +
 782                                 inode->i_sb->s_blocksize - 1) >>
 783                                 inode->i_sb->s_blocksize_bits);
 784                 } else
 785                         start = c;
 786         }
 787
 788         for (i = start + 1; i <= *endnum; i++) {
 789                 if (i == *endnum) {
 790                         if (lastblock)
 791                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 792                 } else if ((laarr[i].extLength >> 30) ==
 793                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 794                         length += (((laarr[i].extLength &
 795                                                 UDF_EXTENT_LENGTH_MASK) +
 796                                     inode->i_sb->s_blocksize - 1) >>
 797                                     inode->i_sb->s_blocksize_bits);
 798                 } else
 799                         break;
 800         }
 801
 802         if (length) {
 803                 int next = laarr[start].extLocation.logicalBlockNum +
 804                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 805                           inode->i_sb->s_blocksize - 1) >>
 806                           inode->i_sb->s_blocksize_bits);
 807                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 808                                 laarr[start].extLocation.partitionReferenceNum,
 809                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 810                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 811                                 currlength);
 812                 if (numalloc)   {
 813                         if (start == (c + 1))
 814                                 laarr[start].extLength +=
 815                                         (numalloc <<
 816                                          inode->i_sb->s_blocksize_bits);
 817                         else {
 818                                 memmove(&laarr[c + 2], &laarr[c + 1],
 819                                         sizeof(long_ad) * (*endnum - (c + 1)));
 820                                 (*endnum)++;
 821                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 822                                 laarr[c + 1].extLocation.partitionReferenceNum =
 823                                         laarr[c].extLocation.
 824                                                         partitionReferenceNum;
 825                                 laarr[c + 1].extLength =
 826                                         EXT_NOT_RECORDED_ALLOCATED |
 827                                         (numalloc <<
 828                                          inode->i_sb->s_blocksize_bits);
 829                                 start = c + 1;
 830                         }
 831
 832                         for (i = start + 1; numalloc && i < *endnum; i++) {
 833                                 int elen = ((laarr[i].extLength &
 834                                                 UDF_EXTENT_LENGTH_MASK) +
 835                                             inode->i_sb->s_blocksize - 1) >>
 836                                             inode->i_sb->s_blocksize_bits;
 837
 838                                 if (elen > numalloc) {
 839                                         laarr[i].extLength -=
 840                                                 (numalloc <<
 841                                                  inode->i_sb->s_blocksize_bits);
 842                                         numalloc = 0;
 843                                 } else {
 844                                         numalloc -= elen;
 845                                         if (*endnum > (i + 1))
 846                                                 memmove(&laarr[i],
 847                                                         &laarr[i + 1],
 848                                                         sizeof(long_ad) *
 849                                                         (*endnum - (i + 1)));
 850                                         i--;
 851                                         (*endnum)--;
 852                                 }
 853                         }
 854                         UDF_I(inode)->i_lenExtents +=
 855                                 numalloc << inode->i_sb->s_blocksize_bits;
 856                 }
 857         }
 858 }
 859
 860 static void udf_merge_extents(struct inode *inode,
 861                               kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 862                               int *endnum)
 863 {
 864         int i;
 865         unsigned long blocksize = inode->i_sb->s_blocksize;
 866         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 867
 868         for (i = 0; i < (*endnum - 1); i++) {
 869                 kernel_long_ad *li /*l[i]*/ = &laarr[i];
 870                 kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 871
 872                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 873                         (((li->extLength >> 30) ==
 874                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 875                         ((lip1->extLocation.logicalBlockNum -
 876                           li->extLocation.logicalBlockNum) ==
 877                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 878                         blocksize - 1) >> blocksize_bits)))) {
 879
 880                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 881                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 882                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 883                                 lip1->extLength = (lip1->extLength -
 884                                                   (li->extLength &
 885                                                    UDF_EXTENT_LENGTH_MASK) +
 886                                                    UDF_EXTENT_LENGTH_MASK) &
 887                                                         ~(blocksize - 1);
 888                                 li->extLength = (li->extLength &
 889                                                  UDF_EXTENT_FLAG_MASK) +
 890                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 891                                                 blocksize;
 892                                 lip1->extLocation.logicalBlockNum =
 893                                         li->extLocation.logicalBlockNum +
 894                                         ((li->extLength &
 895                                                 UDF_EXTENT_LENGTH_MASK) >>
 896                                                 blocksize_bits);
 897                         } else {
 898                                 li->extLength = lip1->extLength +
 899                                         (((li->extLength &
 900                                                 UDF_EXTENT_LENGTH_MASK) +
 901                                          blocksize - 1) & ~(blocksize - 1));
 902                                 if (*endnum > (i + 2))
 903                                         memmove(&laarr[i + 1], &laarr[i + 2],
 904                                                 sizeof(long_ad) *
 905                                                 (*endnum - (i + 2)));
 906                                 i--;
 907                                 (*endnum)--;
 908                         }
 909                 } else if (((li->extLength >> 30) ==
 910                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 911                            ((lip1->extLength >> 30) ==
 912                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 913                         udf_free_blocks(inode->i_sb, inode, li->extLocation, 0,
 914                                         ((li->extLength &
 915                                           UDF_EXTENT_LENGTH_MASK) +
 916                                          blocksize - 1) >> blocksize_bits);
 917                         li->extLocation.logicalBlockNum = 0;
 918                         li->extLocation.partitionReferenceNum = 0;
 919
 920                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 921                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 922                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 923                                 lip1->extLength = (lip1->extLength -
 924                                                    (li->extLength &
 925                                                    UDF_EXTENT_LENGTH_MASK) +
 926                                                    UDF_EXTENT_LENGTH_MASK) &
 927                                                    ~(blocksize - 1);
 928                                 li->extLength = (li->extLength &
 929                                                  UDF_EXTENT_FLAG_MASK) +
 930                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 931                                                 blocksize;
 932                         } else {
 933                                 li->extLength = lip1->extLength +
 934                                         (((li->extLength &
 935                                                 UDF_EXTENT_LENGTH_MASK) +
 936                                           blocksize - 1) & ~(blocksize - 1));
 937                                 if (*endnum > (i + 2))
 938                                         memmove(&laarr[i + 1], &laarr[i + 2],
 939                                                 sizeof(long_ad) *
 940                                                 (*endnum - (i + 2)));
 941                                 i--;
 942                                 (*endnum)--;
 943                         }
 944                 } else if ((li->extLength >> 30) ==
 945                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 946                         udf_free_blocks(inode->i_sb, inode,
 947                                         li->extLocation, 0,
 948                                         ((li->extLength &
 949                                                 UDF_EXTENT_LENGTH_MASK) +
 950                                          blocksize - 1) >> blocksize_bits);
 951                         li->extLocation.logicalBlockNum = 0;
 952                         li->extLocation.partitionReferenceNum = 0;
 953                         li->extLength = (li->extLength &
 954                                                 UDF_EXTENT_LENGTH_MASK) |
 955                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 956                 }
 957         }
 958 }
 959
 960 static void udf_update_extents(struct inode *inode,
 961                                kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 962                                int startnum, int endnum,
 963                                struct extent_position *epos)
 964 {
 965         int start = 0, i;
 966         kernel_lb_addr tmploc;
 967         uint32_t tmplen;
 968
 969         if (startnum > endnum) {
 970                 for (i = 0; i < (startnum - endnum); i++)
 971                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 972                                         laarr[i].extLength);
 973         } else if (startnum < endnum) {
 974                 for (i = 0; i < (endnum - startnum); i++) {
 975                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 976                                         laarr[i].extLength);
 977                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 978                                       &laarr[i].extLength, 1);
 979                         start++;
 980                 }
 981         }
 982
 983         for (i = start; i < endnum; i++) {
 984                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 985                 udf_write_aext(inode, epos, laarr[i].extLocation,
 986                                laarr[i].extLength, 1);
 987         }
 988 }
 989
 990 struct buffer_head *udf_bread(struct inode *inode, int block,
 991                               int create, int *err)
 992 {
 993         struct buffer_head *bh = NULL;
 994
 995         bh = udf_getblk(inode, block, create, err);
 996         if (!bh)
 997                 return NULL;
 998
 999         if (buffer_uptodate(bh))
1000                 return bh;
1001
1002         ll_rw_block(READ, 1, &bh);
1003
1004         wait_on_buffer(bh);
1005         if (buffer_uptodate(bh))
1006                 return bh;
1007
1008         brelse(bh);
1009         *err = -EIO;
1010         return NULL;
1011 }
1012
1013 void udf_truncate(struct inode *inode)
1014 {
1015         int offset;
1016         int err;
1017         struct udf_inode_info *iinfo;
1018
1019         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1020               S_ISLNK(inode->i_mode)))
1021                 return;
1022         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1023                 return;
1024
1025         lock_kernel();
1026         iinfo = UDF_I(inode);
1027         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1028                 if (inode->i_sb->s_blocksize <
1029                                 (udf_file_entry_alloc_offset(inode) +
1030                                  inode->i_size)) {
1031                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1032                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1033                                 inode->i_size = iinfo->i_lenAlloc;
1034                                 unlock_kernel();
1035                                 return;
1036                         } else
1037                                 udf_truncate_extents(inode);
1038                 } else {
1039                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1040                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1041                                 0x00, inode->i_sb->s_blocksize -
1042                                 offset - udf_file_entry_alloc_offset(inode));
1043                         iinfo->i_lenAlloc = inode->i_size;
1044                 }
1045         } else {
1046                 block_truncate_page(inode->i_mapping, inode->i_size,
1047                                     udf_get_block);
1048                 udf_truncate_extents(inode);
1049         }
1050
1051         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1052         if (IS_SYNC(inode))
1053                 udf_sync_inode(inode);
1054         else
1055                 mark_inode_dirty(inode);
1056         unlock_kernel();
1057 }
1058
1059 static void __udf_read_inode(struct inode *inode)
1060 {
1061         struct buffer_head *bh = NULL;
1062         struct fileEntry *fe;
1063         uint16_t ident;
1064         struct udf_inode_info *iinfo = UDF_I(inode);
1065
1066         /*
1067          * Set defaults, but the inode is still incomplete!
1068          * Note: get_new_inode() sets the following on a new inode:
1069          *      i_sb = sb
1070          *      i_no = ino
1071          *      i_flags = sb->s_flags
1072          *      i_state = 0
1073          * clean_inode(): zero fills and sets
1074          *      i_count = 1
1075          *      i_nlink = 1
1076          *      i_op = NULL;
1077          */
1078         bh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 0, &ident);
1079         if (!bh) {
1080                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1081                        inode->i_ino);
1082                 make_bad_inode(inode);
1083                 return;
1084         }
1085
1086         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1087             ident != TAG_IDENT_USE) {
1088                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1089                                 "failed ident=%d\n", inode->i_ino, ident);
1090                 brelse(bh);
1091                 make_bad_inode(inode);
1092                 return;
1093         }
1094
1095         fe = (struct fileEntry *)bh->b_data;
1096
1097         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1098                 struct buffer_head *ibh;
1099
1100                 ibh = udf_read_ptagged(inode->i_sb, iinfo->i_location, 1,
1101                                         &ident);
1102                 if (ident == TAG_IDENT_IE && ibh) {
1103                         struct buffer_head *nbh = NULL;
1104                         kernel_lb_addr loc;
1105                         struct indirectEntry *ie;
1106
1107                         ie = (struct indirectEntry *)ibh->b_data;
1108                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1109
1110                         if (ie->indirectICB.extLength &&
1111                                 (nbh = udf_read_ptagged(inode->i_sb, loc, 0,
1112                                                         &ident))) {
1113                                 if (ident == TAG_IDENT_FE ||
1114                                         ident == TAG_IDENT_EFE) {
1115                                         memcpy(&iinfo->i_location,
1116                                                 &loc,
1117                                                 sizeof(kernel_lb_addr));
1118                                         brelse(bh);
1119                                         brelse(ibh);
1120                                         brelse(nbh);
1121                                         __udf_read_inode(inode);
1122                                         return;
1123                                 }
1124                                 brelse(nbh);
1125                         }
1126                 }
1127                 brelse(ibh);
1128         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1129                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1130                        le16_to_cpu(fe->icbTag.strategyType));
1131                 brelse(bh);
1132                 make_bad_inode(inode);
1133                 return;
1134         }
1135         udf_fill_inode(inode, bh);
1136
1137         brelse(bh);
1138 }
1139
1140 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1141 {
1142         struct fileEntry *fe;
1143         struct extendedFileEntry *efe;
1144         int offset;
1145         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1146         struct udf_inode_info *iinfo = UDF_I(inode);
1147
1148         fe = (struct fileEntry *)bh->b_data;
1149         efe = (struct extendedFileEntry *)bh->b_data;
1150
1151         if (fe->icbTag.strategyType == cpu_to_le16(4))
1152                 iinfo->i_strat4096 = 0;
1153         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1154                 iinfo->i_strat4096 = 1;
1155
1156         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1157                                                         ICBTAG_FLAG_AD_MASK;
1158         iinfo->i_unique = 0;
1159         iinfo->i_lenEAttr = 0;
1160         iinfo->i_lenExtents = 0;
1161         iinfo->i_lenAlloc = 0;
1162         iinfo->i_next_alloc_block = 0;
1163         iinfo->i_next_alloc_goal = 0;
1164         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1165                 iinfo->i_efe = 1;
1166                 iinfo->i_use = 0;
1167                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1168                                         sizeof(struct extendedFileEntry))) {
1169                         make_bad_inode(inode);
1170                         return;
1171                 }
1172                 memcpy(iinfo->i_ext.i_data,
1173                        bh->b_data + sizeof(struct extendedFileEntry),
1174                        inode->i_sb->s_blocksize -
1175                                         sizeof(struct extendedFileEntry));
1176         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1177                 iinfo->i_efe = 0;
1178                 iinfo->i_use = 0;
1179                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1180                                                 sizeof(struct fileEntry))) {
1181                         make_bad_inode(inode);
1182                         return;
1183                 }
1184                 memcpy(iinfo->i_ext.i_data,
1185                        bh->b_data + sizeof(struct fileEntry),
1186                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1187         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1188                 iinfo->i_efe = 0;
1189                 iinfo->i_use = 1;
1190                 iinfo->i_lenAlloc = le32_to_cpu(
1191                                 ((struct unallocSpaceEntry *)bh->b_data)->
1192                                  lengthAllocDescs);
1193                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1194                                         sizeof(struct unallocSpaceEntry))) {
1195                         make_bad_inode(inode);
1196                         return;
1197                 }
1198                 memcpy(iinfo->i_ext.i_data,
1199                        bh->b_data + sizeof(struct unallocSpaceEntry),
1200                        inode->i_sb->s_blocksize -
1201                                         sizeof(struct unallocSpaceEntry));
1202                 return;
1203         }
1204
1205         inode->i_uid = le32_to_cpu(fe->uid);
1206         if (inode->i_uid == -1 ||
1207             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1208             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1209                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1210
1211         inode->i_gid = le32_to_cpu(fe->gid);
1212         if (inode->i_gid == -1 ||
1213             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1214             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1215                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1216
1217         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1218         if (!inode->i_nlink)
1219                 inode->i_nlink = 1;
1220
1221         inode->i_size = le64_to_cpu(fe->informationLength);
1222         iinfo->i_lenExtents = inode->i_size;
1223
1224         inode->i_mode = udf_convert_permissions(fe);
1225         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1226
1227         if (iinfo->i_efe == 0) {
1228                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1229                         (inode->i_sb->s_blocksize_bits - 9);
1230
1231                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1232                         inode->i_atime = sbi->s_record_time;
1233
1234                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1235                                             fe->modificationTime))
1236                         inode->i_mtime = sbi->s_record_time;
1237
1238                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1239                         inode->i_ctime = sbi->s_record_time;
1240
1241                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1242                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1243                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1244                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1245         } else {
1246                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1247                     (inode->i_sb->s_blocksize_bits - 9);
1248
1249                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1250                         inode->i_atime = sbi->s_record_time;
1251
1252                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1253                                             efe->modificationTime))
1254                         inode->i_mtime = sbi->s_record_time;
1255
1256                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1257                         iinfo->i_crtime = sbi->s_record_time;
1258
1259                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1260                         inode->i_ctime = sbi->s_record_time;
1261
1262                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1263                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1264                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1265                 offset = sizeof(struct extendedFileEntry) +
1266                                                         iinfo->i_lenEAttr;
1267         }
1268
1269         switch (fe->icbTag.fileType) {
1270         case ICBTAG_FILE_TYPE_DIRECTORY:
1271                 inode->i_op = &udf_dir_inode_operations;
1272                 inode->i_fop = &udf_dir_operations;
1273                 inode->i_mode |= S_IFDIR;
1274                 inc_nlink(inode);
1275                 break;
1276         case ICBTAG_FILE_TYPE_REALTIME:
1277         case ICBTAG_FILE_TYPE_REGULAR:
1278         case ICBTAG_FILE_TYPE_UNDEF:
1279         case ICBTAG_FILE_TYPE_VAT20:
1280                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1281                         inode->i_data.a_ops = &udf_adinicb_aops;
1282                 else
1283                         inode->i_data.a_ops = &udf_aops;
1284                 inode->i_op = &udf_file_inode_operations;
1285                 inode->i_fop = &udf_file_operations;
1286                 inode->i_mode |= S_IFREG;
1287                 break;
1288         case ICBTAG_FILE_TYPE_BLOCK:
1289                 inode->i_mode |= S_IFBLK;
1290                 break;
1291         case ICBTAG_FILE_TYPE_CHAR:
1292                 inode->i_mode |= S_IFCHR;
1293                 break;
1294         case ICBTAG_FILE_TYPE_FIFO:
1295                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1296                 break;
1297         case ICBTAG_FILE_TYPE_SOCKET:
1298                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1299                 break;
1300         case ICBTAG_FILE_TYPE_SYMLINK:
1301                 inode->i_data.a_ops = &udf_symlink_aops;
1302                 inode->i_op = &page_symlink_inode_operations;
1303                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1304                 break;
1305         case ICBTAG_FILE_TYPE_MAIN:
1306                 udf_debug("METADATA FILE-----\n");
1307                 break;
1308         case ICBTAG_FILE_TYPE_MIRROR:
1309                 udf_debug("METADATA MIRROR FILE-----\n");
1310                 break;
1311         case ICBTAG_FILE_TYPE_BITMAP:
1312                 udf_debug("METADATA BITMAP FILE-----\n");
1313                 break;
1314         default:
1315                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1316                                 "file type=%d\n", inode->i_ino,
1317                                 fe->icbTag.fileType);
1318                 make_bad_inode(inode);
1319                 return;
1320         }
1321         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1322                 struct deviceSpec *dsea =
1323                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1324                 if (dsea) {
1325                         init_special_inode(inode, inode->i_mode,
1326                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1327                                       le32_to_cpu(dsea->minorDeviceIdent)));
1328                         /* Developer ID ??? */
1329                 } else
1330                         make_bad_inode(inode);
1331         }
1332 }
1333
1334 static int udf_alloc_i_data(struct inode *inode, size_t size)
1335 {
1336         struct udf_inode_info *iinfo = UDF_I(inode);
1337         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1338
1339         if (!iinfo->i_ext.i_data) {
1340                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1341                                 "no free memory\n", inode->i_ino);
1342                 return -ENOMEM;
1343         }
1344
1345         return 0;
1346 }
1347
1348 static mode_t udf_convert_permissions(struct fileEntry *fe)
1349 {
1350         mode_t mode;
1351         uint32_t permissions;
1352         uint32_t flags;
1353
1354         permissions = le32_to_cpu(fe->permissions);
1355         flags = le16_to_cpu(fe->icbTag.flags);
1356
1357         mode =  ((permissions) & S_IRWXO) |
1358                 ((permissions >> 2) & S_IRWXG) |
1359                 ((permissions >> 4) & S_IRWXU) |
1360                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1361                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1362                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1363
1364         return mode;
1365 }
1366
1367 int udf_write_inode(struct inode *inode, int sync)
1368 {
1369         int ret;
1370
1371         lock_kernel();
1372         ret = udf_update_inode(inode, sync);
1373         unlock_kernel();
1374
1375         return ret;
1376 }
1377
1378 int udf_sync_inode(struct inode *inode)
1379 {
1380         return udf_update_inode(inode, 1);
1381 }
1382
1383 static int udf_update_inode(struct inode *inode, int do_sync)
1384 {
1385         struct buffer_head *bh = NULL;
1386         struct fileEntry *fe;
1387         struct extendedFileEntry *efe;
1388         uint32_t udfperms;
1389         uint16_t icbflags;
1390         uint16_t crclen;
1391         int err = 0;
1392         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1393         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1394         struct udf_inode_info *iinfo = UDF_I(inode);
1395
1396         bh = udf_tread(inode->i_sb,
1397                         udf_get_lb_pblock(inode->i_sb,
1398                                           iinfo->i_location, 0));
1399         if (!bh) {
1400                 udf_debug("bread failure\n");
1401                 return -EIO;
1402         }
1403
1404         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1405
1406         fe = (struct fileEntry *)bh->b_data;
1407         efe = (struct extendedFileEntry *)bh->b_data;
1408
1409         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1410                 struct unallocSpaceEntry *use =
1411                         (struct unallocSpaceEntry *)bh->b_data;
1412
1413                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1414                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1415                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1416                                         sizeof(struct unallocSpaceEntry));
1417                 crclen = sizeof(struct unallocSpaceEntry) +
1418                                 iinfo->i_lenAlloc - sizeof(tag);
1419                 use->descTag.tagLocation = cpu_to_le32(
1420                                                 iinfo->i_location.
1421                                                         logicalBlockNum);
1422                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1423                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1424                                                            sizeof(tag),
1425                                                            crclen));
1426                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1427
1428                 mark_buffer_dirty(bh);
1429                 brelse(bh);
1430                 return err;
1431         }
1432
1433         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1434                 fe->uid = cpu_to_le32(-1);
1435         else
1436                 fe->uid = cpu_to_le32(inode->i_uid);
1437
1438         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1439                 fe->gid = cpu_to_le32(-1);
1440         else
1441                 fe->gid = cpu_to_le32(inode->i_gid);
1442
1443         udfperms = ((inode->i_mode & S_IRWXO)) |
1444                    ((inode->i_mode & S_IRWXG) << 2) |
1445                    ((inode->i_mode & S_IRWXU) << 4);
1446
1447         udfperms |= (le32_to_cpu(fe->permissions) &
1448                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1449                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1450                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1451         fe->permissions = cpu_to_le32(udfperms);
1452
1453         if (S_ISDIR(inode->i_mode))
1454                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1455         else
1456                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1457
1458         fe->informationLength = cpu_to_le64(inode->i_size);
1459
1460         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1461                 regid *eid;
1462                 struct deviceSpec *dsea =
1463                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1464                 if (!dsea) {
1465                         dsea = (struct deviceSpec *)
1466                                 udf_add_extendedattr(inode,
1467                                                      sizeof(struct deviceSpec) +
1468                                                      sizeof(regid), 12, 0x3);
1469                         dsea->attrType = cpu_to_le32(12);
1470                         dsea->attrSubtype = 1;
1471                         dsea->attrLength = cpu_to_le32(
1472                                                 sizeof(struct deviceSpec) +
1473                                                 sizeof(regid));
1474                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1475                 }
1476                 eid = (regid *)dsea->impUse;
1477                 memset(eid, 0, sizeof(regid));
1478                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1479                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1480                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1481                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1482                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1483         }
1484
1485         if (iinfo->i_efe == 0) {
1486                 memcpy(bh->b_data + sizeof(struct fileEntry),
1487                        iinfo->i_ext.i_data,
1488                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1489                 fe->logicalBlocksRecorded = cpu_to_le64(
1490                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1491                         (blocksize_bits - 9));
1492
1493                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1494                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1495                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1496                 memset(&(fe->impIdent), 0, sizeof(regid));
1497                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1498                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1499                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1500                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1501                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1502                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1503                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1504                 crclen = sizeof(struct fileEntry);
1505         } else {
1506                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1507                        iinfo->i_ext.i_data,
1508                        inode->i_sb->s_blocksize -
1509                                         sizeof(struct extendedFileEntry));
1510                 efe->objectSize = cpu_to_le64(inode->i_size);
1511                 efe->logicalBlocksRecorded = cpu_to_le64(
1512                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1513                         (blocksize_bits - 9));
1514
1515                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1516                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1517                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1518                         iinfo->i_crtime = inode->i_atime;
1519
1520                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1521                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1522                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1523                         iinfo->i_crtime = inode->i_mtime;
1524
1525                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1526                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1527                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1528                         iinfo->i_crtime = inode->i_ctime;
1529
1530                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1531                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1532                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1533                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1534
1535                 memset(&(efe->impIdent), 0, sizeof(regid));
1536                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1537                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1538                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1539                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1540                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1541                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1542                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1543                 crclen = sizeof(struct extendedFileEntry);
1544         }
1545         if (iinfo->i_strat4096) {
1546                 fe->icbTag.strategyType = cpu_to_le16(4096);
1547                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1548                 fe->icbTag.numEntries = cpu_to_le16(2);
1549         } else {
1550                 fe->icbTag.strategyType = cpu_to_le16(4);
1551                 fe->icbTag.numEntries = cpu_to_le16(1);
1552         }
1553
1554         if (S_ISDIR(inode->i_mode))
1555                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1556         else if (S_ISREG(inode->i_mode))
1557                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1558         else if (S_ISLNK(inode->i_mode))
1559                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1560         else if (S_ISBLK(inode->i_mode))
1561                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1562         else if (S_ISCHR(inode->i_mode))
1563                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1564         else if (S_ISFIFO(inode->i_mode))
1565                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1566         else if (S_ISSOCK(inode->i_mode))
1567                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1568
1569         icbflags =      iinfo->i_alloc_type |
1570                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1571                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1572                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1573                         (le16_to_cpu(fe->icbTag.flags) &
1574                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1575                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1576
1577         fe->icbTag.flags = cpu_to_le16(icbflags);
1578         if (sbi->s_udfrev >= 0x0200)
1579                 fe->descTag.descVersion = cpu_to_le16(3);
1580         else
1581                 fe->descTag.descVersion = cpu_to_le16(2);
1582         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1583         fe->descTag.tagLocation = cpu_to_le32(
1584                                         iinfo->i_location.logicalBlockNum);
1585         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
1586                                                                 sizeof(tag);
1587         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1588         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(tag),
1589                                                   crclen));
1590         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1591
1592         /* write the data blocks */
1593         mark_buffer_dirty(bh);
1594         if (do_sync) {
1595                 sync_dirty_buffer(bh);
1596                 if (buffer_req(bh) && !buffer_uptodate(bh)) {
1597                         printk(KERN_WARNING "IO error syncing udf inode "
1598                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1599                                 inode->i_ino);
1600                         err = -EIO;
1601                 }
1602         }
1603         brelse(bh);
1604
1605         return err;
1606 }
1607
1608 struct inode *udf_iget(struct super_block *sb, kernel_lb_addr ino)
1609 {
1610         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1611         struct inode *inode = iget_locked(sb, block);
1612
1613         if (!inode)
1614                 return NULL;
1615
1616         if (inode->i_state & I_NEW) {
1617                 memcpy(&UDF_I(inode)->i_location, &ino, sizeof(kernel_lb_addr));
1618                 __udf_read_inode(inode);
1619                 unlock_new_inode(inode);
1620         }
1621
1622         if (is_bad_inode(inode))
1623                 goto out_iput;
1624
1625         if (ino.logicalBlockNum >= UDF_SB(sb)->
1626                         s_partmaps[ino.partitionReferenceNum].s_partition_len) {
1627                 udf_debug("block=%d, partition=%d out of range\n",
1628                           ino.logicalBlockNum, ino.partitionReferenceNum);
1629                 make_bad_inode(inode);
1630                 goto out_iput;
1631         }
1632
1633         return inode;
1634
1635  out_iput:
1636         iput(inode);
1637         return NULL;
1638 }
1639
1640 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1641                     kernel_lb_addr eloc, uint32_t elen, int inc)
1642 {
1643         int adsize;
1644         short_ad *sad = NULL;
1645         long_ad *lad = NULL;
1646         struct allocExtDesc *aed;
1647         int8_t etype;
1648         uint8_t *ptr;
1649         struct udf_inode_info *iinfo = UDF_I(inode);
1650
1651         if (!epos->bh)
1652                 ptr = iinfo->i_ext.i_data + epos->offset -
1653                         udf_file_entry_alloc_offset(inode) +
1654                         iinfo->i_lenEAttr;
1655         else
1656                 ptr = epos->bh->b_data + epos->offset;
1657
1658         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1659                 adsize = sizeof(short_ad);
1660         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1661                 adsize = sizeof(long_ad);
1662         else
1663                 return -1;
1664
1665         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1666                 char *sptr, *dptr;
1667                 struct buffer_head *nbh;
1668                 int err, loffset;
1669                 kernel_lb_addr obloc = epos->block;
1670
1671                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1672                                                 obloc.partitionReferenceNum,
1673                                                 obloc.logicalBlockNum, &err);
1674                 if (!epos->block.logicalBlockNum)
1675                         return -1;
1676                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1677                                                                  epos->block,
1678                                                                  0));
1679                 if (!nbh)
1680                         return -1;
1681                 lock_buffer(nbh);
1682                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1683                 set_buffer_uptodate(nbh);
1684                 unlock_buffer(nbh);
1685                 mark_buffer_dirty_inode(nbh, inode);
1686
1687                 aed = (struct allocExtDesc *)(nbh->b_data);
1688                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1689                         aed->previousAllocExtLocation =
1690                                         cpu_to_le32(obloc.logicalBlockNum);
1691                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1692                         loffset = epos->offset;
1693                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1694                         sptr = ptr - adsize;
1695                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1696                         memcpy(dptr, sptr, adsize);
1697                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1698                 } else {
1699                         loffset = epos->offset + adsize;
1700                         aed->lengthAllocDescs = cpu_to_le32(0);
1701                         sptr = ptr;
1702                         epos->offset = sizeof(struct allocExtDesc);
1703
1704                         if (epos->bh) {
1705                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1706                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1707                         } else {
1708                                 iinfo->i_lenAlloc += adsize;
1709                                 mark_inode_dirty(inode);
1710                         }
1711                 }
1712                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1713                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1714                                     epos->block.logicalBlockNum, sizeof(tag));
1715                 else
1716                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1717                                     epos->block.logicalBlockNum, sizeof(tag));
1718                 switch (iinfo->i_alloc_type) {
1719                 case ICBTAG_FLAG_AD_SHORT:
1720                         sad = (short_ad *)sptr;
1721                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1722                                                      inode->i_sb->s_blocksize);
1723                         sad->extPosition =
1724                                 cpu_to_le32(epos->block.logicalBlockNum);
1725                         break;
1726                 case ICBTAG_FLAG_AD_LONG:
1727                         lad = (long_ad *)sptr;
1728                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1729                                                      inode->i_sb->s_blocksize);
1730                         lad->extLocation = cpu_to_lelb(epos->block);
1731                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1732                         break;
1733                 }
1734                 if (epos->bh) {
1735                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1736                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1737                                 udf_update_tag(epos->bh->b_data, loffset);
1738                         else
1739                                 udf_update_tag(epos->bh->b_data,
1740                                                 sizeof(struct allocExtDesc));
1741                         mark_buffer_dirty_inode(epos->bh, inode);
1742                         brelse(epos->bh);
1743                 } else {
1744                         mark_inode_dirty(inode);
1745                 }
1746                 epos->bh = nbh;
1747         }
1748
1749         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1750
1751         if (!epos->bh) {
1752                 iinfo->i_lenAlloc += adsize;
1753                 mark_inode_dirty(inode);
1754         } else {
1755                 aed = (struct allocExtDesc *)epos->bh->b_data;
1756                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1757                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1758                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1759                         udf_update_tag(epos->bh->b_data,
1760                                         epos->offset + (inc ? 0 : adsize));
1761                 else
1762                         udf_update_tag(epos->bh->b_data,
1763                                         sizeof(struct allocExtDesc));
1764                 mark_buffer_dirty_inode(epos->bh, inode);
1765         }
1766
1767         return etype;
1768 }
1769
1770 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1771                       kernel_lb_addr eloc, uint32_t elen, int inc)
1772 {
1773         int adsize;
1774         uint8_t *ptr;
1775         short_ad *sad;
1776         long_ad *lad;
1777         struct udf_inode_info *iinfo = UDF_I(inode);
1778
1779         if (!epos->bh)
1780                 ptr = iinfo->i_ext.i_data + epos->offset -
1781                         udf_file_entry_alloc_offset(inode) +
1782                         iinfo->i_lenEAttr;
1783         else
1784                 ptr = epos->bh->b_data + epos->offset;
1785
1786         switch (iinfo->i_alloc_type) {
1787         case ICBTAG_FLAG_AD_SHORT:
1788                 sad = (short_ad *)ptr;
1789                 sad->extLength = cpu_to_le32(elen);
1790                 sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1791                 adsize = sizeof(short_ad);
1792                 break;
1793         case ICBTAG_FLAG_AD_LONG:
1794                 lad = (long_ad *)ptr;
1795                 lad->extLength = cpu_to_le32(elen);
1796                 lad->extLocation = cpu_to_lelb(eloc);
1797                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1798                 adsize = sizeof(long_ad);
1799                 break;
1800         default:
1801                 return -1;
1802         }
1803
1804         if (epos->bh) {
1805                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1806                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1807                         struct allocExtDesc *aed =
1808                                 (struct allocExtDesc *)epos->bh->b_data;
1809                         udf_update_tag(epos->bh->b_data,
1810                                        le32_to_cpu(aed->lengthAllocDescs) +
1811                                        sizeof(struct allocExtDesc));
1812                 }
1813                 mark_buffer_dirty_inode(epos->bh, inode);
1814         } else {
1815                 mark_inode_dirty(inode);
1816         }
1817
1818         if (inc)
1819                 epos->offset += adsize;
1820
1821         return (elen >> 30);
1822 }
1823
1824 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1825                      kernel_lb_addr *eloc, uint32_t *elen, int inc)
1826 {
1827         int8_t etype;
1828
1829         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1830                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1831                 int block;
1832                 epos->block = *eloc;
1833                 epos->offset = sizeof(struct allocExtDesc);
1834                 brelse(epos->bh);
1835                 block = udf_get_lb_pblock(inode->i_sb, epos->block, 0);
1836                 epos->bh = udf_tread(inode->i_sb, block);
1837                 if (!epos->bh) {
1838                         udf_debug("reading block %d failed!\n", block);
1839                         return -1;
1840                 }
1841         }
1842
1843         return etype;
1844 }
1845
1846 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1847                         kernel_lb_addr *eloc, uint32_t *elen, int inc)
1848 {
1849         int alen;
1850         int8_t etype;
1851         uint8_t *ptr;
1852         short_ad *sad;
1853         long_ad *lad;
1854         struct udf_inode_info *iinfo = UDF_I(inode);
1855
1856         if (!epos->bh) {
1857                 if (!epos->offset)
1858                         epos->offset = udf_file_entry_alloc_offset(inode);
1859                 ptr = iinfo->i_ext.i_data + epos->offset -
1860                         udf_file_entry_alloc_offset(inode) +
1861                         iinfo->i_lenEAttr;
1862                 alen = udf_file_entry_alloc_offset(inode) +
1863                                                         iinfo->i_lenAlloc;
1864         } else {
1865                 if (!epos->offset)
1866                         epos->offset = sizeof(struct allocExtDesc);
1867                 ptr = epos->bh->b_data + epos->offset;
1868                 alen = sizeof(struct allocExtDesc) +
1869                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1870                                                         lengthAllocDescs);
1871         }
1872
1873         switch (iinfo->i_alloc_type) {
1874         case ICBTAG_FLAG_AD_SHORT:
1875                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1876                 if (!sad)
1877                         return -1;
1878                 etype = le32_to_cpu(sad->extLength) >> 30;
1879                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1880                 eloc->partitionReferenceNum =
1881                                 iinfo->i_location.partitionReferenceNum;
1882                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1883                 break;
1884         case ICBTAG_FLAG_AD_LONG:
1885                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1886                 if (!lad)
1887                         return -1;
1888                 etype = le32_to_cpu(lad->extLength) >> 30;
1889                 *eloc = lelb_to_cpu(lad->extLocation);
1890                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1891                 break;
1892         default:
1893                 udf_debug("alloc_type = %d unsupported\n",
1894                                 iinfo->i_alloc_type);
1895                 return -1;
1896         }
1897
1898         return etype;
1899 }
1900
1901 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1902                               kernel_lb_addr neloc, uint32_t nelen)
1903 {
1904         kernel_lb_addr oeloc;
1905         uint32_t oelen;
1906         int8_t etype;
1907
1908         if (epos.bh)
1909                 get_bh(epos.bh);
1910
1911         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1912                 udf_write_aext(inode, &epos, neloc, nelen, 1);
1913                 neloc = oeloc;
1914                 nelen = (etype << 30) | oelen;
1915         }
1916         udf_add_aext(inode, &epos, neloc, nelen, 1);
1917         brelse(epos.bh);
1918
1919         return (nelen >> 30);
1920 }
1921
1922 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1923                        kernel_lb_addr eloc, uint32_t elen)
1924 {
1925         struct extent_position oepos;
1926         int adsize;
1927         int8_t etype;
1928         struct allocExtDesc *aed;
1929         struct udf_inode_info *iinfo;
1930
1931         if (epos.bh) {
1932                 get_bh(epos.bh);
1933                 get_bh(epos.bh);
1934         }
1935
1936         iinfo = UDF_I(inode);
1937         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1938                 adsize = sizeof(short_ad);
1939         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1940                 adsize = sizeof(long_ad);
1941         else
1942                 adsize = 0;
1943
1944         oepos = epos;
1945         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1946                 return -1;
1947
1948         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1949                 udf_write_aext(inode, &oepos, eloc, (etype << 30) | elen, 1);
1950                 if (oepos.bh != epos.bh) {
1951                         oepos.block = epos.block;
1952                         brelse(oepos.bh);
1953                         get_bh(epos.bh);
1954                         oepos.bh = epos.bh;
1955                         oepos.offset = epos.offset - adsize;
1956                 }
1957         }
1958         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1959         elen = 0;
1960
1961         if (epos.bh != oepos.bh) {
1962                 udf_free_blocks(inode->i_sb, inode, epos.block, 0, 1);
1963                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1964                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1965                 if (!oepos.bh) {
1966                         iinfo->i_lenAlloc -= (adsize * 2);
1967                         mark_inode_dirty(inode);
1968                 } else {
1969                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1970                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1971                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1972                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1973                                 udf_update_tag(oepos.bh->b_data,
1974                                                 oepos.offset - (2 * adsize));
1975                         else
1976                                 udf_update_tag(oepos.bh->b_data,
1977                                                 sizeof(struct allocExtDesc));
1978                         mark_buffer_dirty_inode(oepos.bh, inode);
1979                 }
1980         } else {
1981                 udf_write_aext(inode, &oepos, eloc, elen, 1);
1982                 if (!oepos.bh) {
1983                         iinfo->i_lenAlloc -= adsize;
1984                         mark_inode_dirty(inode);
1985                 } else {
1986                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1987                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1988                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1989                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1990                                 udf_update_tag(oepos.bh->b_data,
1991                                                 epos.offset - adsize);
1992                         else
1993                                 udf_update_tag(oepos.bh->b_data,
1994                                                 sizeof(struct allocExtDesc));
1995                         mark_buffer_dirty_inode(oepos.bh, inode);
1996                 }
1997         }
1998
1999         brelse(epos.bh);
2000         brelse(oepos.bh);
2001
2002         return (elen >> 30);
2003 }
2004
2005 int8_t inode_bmap(struct inode *inode, sector_t block,
2006                   struct extent_position *pos, kernel_lb_addr *eloc,
2007                   uint32_t *elen, sector_t *offset)
2008 {
2009         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2010         loff_t lbcount = 0, bcount =
2011             (loff_t) block << blocksize_bits;
2012         int8_t etype;
2013         struct udf_inode_info *iinfo;
2014
2015         iinfo = UDF_I(inode);
2016         pos->offset = 0;
2017         pos->block = iinfo->i_location;
2018         pos->bh = NULL;
2019         *elen = 0;
2020
2021         do {
2022                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2023                 if (etype == -1) {
2024                         *offset = (bcount - lbcount) >> blocksize_bits;
2025                         iinfo->i_lenExtents = lbcount;
2026                         return -1;
2027                 }
2028                 lbcount += *elen;
2029         } while (lbcount <= bcount);
2030
2031         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2032
2033         return etype;
2034 }
2035
2036 long udf_block_map(struct inode *inode, sector_t block)
2037 {
2038         kernel_lb_addr eloc;
2039         uint32_t elen;
2040         sector_t offset;
2041         struct extent_position epos = {};
2042         int ret;
2043
2044         lock_kernel();
2045
2046         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2047                                                 (EXT_RECORDED_ALLOCATED >> 30))
2048                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset);
2049         else
2050                 ret = 0;
2051
2052         unlock_kernel();
2053         brelse(epos.bh);
2054
2055         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2056                 return udf_fixed_to_variable(ret);
2057         else
2058                 return ret;
2059 }