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   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map and udf_read_inode
  23  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  24  *                block boundaries (which is not actually allowed)
  25  *  12/20/98      added support for strategy 4096
  26  *  03/07/99      rewrote udf_block_map (again)
  27  *                New funcs, inode_bmap, udf_next_aext
  28  *  04/19/99      Support for writing device EA's for major/minor #
  29  */
  30
  31 #include "udfdecl.h"
  32 #include <linux/mm.h>
  33 #include <linux/smp_lock.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38 #include <linux/slab.h>
  39
  40 #include "udf_i.h"
  41 #include "udf_sb.h"
  42
  43 MODULE_AUTHOR("Ben Fennema");
  44 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  45 MODULE_LICENSE("GPL");
  46
  47 #define EXTENT_MERGE_SIZE 5
  48
  49 static mode_t udf_convert_permissions(struct fileEntry *);
  50 static int udf_update_inode(struct inode *, int);
  51 static void udf_fill_inode(struct inode *, struct buffer_head *);
  52 static struct buffer_head *inode_getblk(struct inode *, long, int *,
  53         long *, int *);
  54 static int8_t udf_insert_aext(struct inode *, kernel_lb_addr, int,
  55         kernel_lb_addr, uint32_t, struct buffer_head *);
  56 static void udf_split_extents(struct inode *, int *, int, int,
  57         kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  58 static void udf_prealloc_extents(struct inode *, int, int,
  59          kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  60 static void udf_merge_extents(struct inode *,
  61          kernel_long_ad [EXTENT_MERGE_SIZE], int *);
  62 static void udf_update_extents(struct inode *,
  63         kernel_long_ad [EXTENT_MERGE_SIZE], int, int,
  64         kernel_lb_addr, uint32_t, struct buffer_head **);
  65 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  66
  67 /*
  68  * udf_delete_inode
  69  *
  70  * PURPOSE
  71  *      Clean-up before the specified inode is destroyed.
  72  *
  73  * DESCRIPTION
  74  *      This routine is called when the kernel destroys an inode structure
  75  *      ie. when iput() finds i_count == 0.
  76  *
  77  * HISTORY
  78  *      July 1, 1997 - Andrew E. Mileski
  79  *      Written, tested, and released.
  80  *
  81  *  Called at the last iput() if i_nlink is zero.
  82  */
  83 void udf_delete_inode(struct inode * inode)
  84 {
  85         truncate_inode_pages(&inode->i_data, 0);
  86
  87         if (is_bad_inode(inode))
  88                 goto no_delete;
  89
  90         inode->i_size = 0;
  91         udf_truncate(inode);
  92         lock_kernel();
  93
  94         udf_update_inode(inode, IS_SYNC(inode));
  95         udf_free_inode(inode);
  96
  97         unlock_kernel();
  98         return;
  99 no_delete:
 100         clear_inode(inode);
 101 }
 102
 103 void udf_clear_inode(struct inode *inode)
 104 {
 105         if (!(inode->i_sb->s_flags & MS_RDONLY)) {
 106                 lock_kernel();
 107                 udf_discard_prealloc(inode);
 108                 unlock_kernel();
 109         }
 110
 111         kfree(UDF_I_DATA(inode));
 112         UDF_I_DATA(inode) = 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_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
 126 {
 127         return block_prepare_write(page, from, to, udf_get_block);
 128 }
 129
 130 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 131 {
 132         return generic_block_bmap(mapping,block,udf_get_block);
 133 }
 134
 135 const struct address_space_operations udf_aops = {
 136         .readpage               = udf_readpage,
 137         .writepage              = udf_writepage,
 138         .sync_page              = block_sync_page,
 139         .prepare_write          = udf_prepare_write,
 140         .commit_write           = generic_commit_write,
 141         .bmap                   = udf_bmap,
 142 };
 143
 144 void udf_expand_file_adinicb(struct inode * inode, int newsize, int * err)
 145 {
 146         struct page *page;
 147         char *kaddr;
 148         struct writeback_control udf_wbc = {
 149                 .sync_mode = WB_SYNC_NONE,
 150                 .nr_to_write = 1,
 151         };
 152
 153         /* from now on we have normal address_space methods */
 154         inode->i_data.a_ops = &udf_aops;
 155
 156         if (!UDF_I_LENALLOC(inode))
 157         {
 158                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 159                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 160                 else
 161                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 162                 mark_inode_dirty(inode);
 163                 return;
 164         }
 165
 166         page = grab_cache_page(inode->i_mapping, 0);
 167         BUG_ON(!PageLocked(page));
 168
 169         if (!PageUptodate(page))
 170         {
 171                 kaddr = kmap(page);
 172                 memset(kaddr + UDF_I_LENALLOC(inode), 0x00,
 173                         PAGE_CACHE_SIZE - UDF_I_LENALLOC(inode));
 174                 memcpy(kaddr, UDF_I_DATA(inode) + UDF_I_LENEATTR(inode),
 175                         UDF_I_LENALLOC(inode));
 176                 flush_dcache_page(page);
 177                 SetPageUptodate(page);
 178                 kunmap(page);
 179         }
 180         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0x00,
 181                 UDF_I_LENALLOC(inode));
 182         UDF_I_LENALLOC(inode) = 0;
 183         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 184                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_SHORT;
 185         else
 186                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_LONG;
 187
 188         inode->i_data.a_ops->writepage(page, &udf_wbc);
 189         page_cache_release(page);
 190
 191         mark_inode_dirty(inode);
 192 }
 193
 194 struct buffer_head * udf_expand_dir_adinicb(struct inode *inode, int *block, int *err)
 195 {
 196         int newblock;
 197         struct buffer_head *sbh = NULL, *dbh = NULL;
 198         kernel_lb_addr bloc, eloc;
 199         uint32_t elen, extoffset;
 200         uint8_t alloctype;
 201
 202         struct udf_fileident_bh sfibh, dfibh;
 203         loff_t f_pos = udf_ext0_offset(inode) >> 2;
 204         int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
 205         struct fileIdentDesc cfi, *sfi, *dfi;
 206
 207         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 208                 alloctype = ICBTAG_FLAG_AD_SHORT;
 209         else
 210                 alloctype = ICBTAG_FLAG_AD_LONG;
 211
 212         if (!inode->i_size)
 213         {
 214                 UDF_I_ALLOCTYPE(inode) = alloctype;
 215                 mark_inode_dirty(inode);
 216                 return NULL;
 217         }
 218
 219         /* alloc block, and copy data to it */
 220         *block = udf_new_block(inode->i_sb, inode,
 221                 UDF_I_LOCATION(inode).partitionReferenceNum,
 222                 UDF_I_LOCATION(inode).logicalBlockNum, err);
 223
 224         if (!(*block))
 225                 return NULL;
 226         newblock = udf_get_pblock(inode->i_sb, *block,
 227                 UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 228         if (!newblock)
 229                 return NULL;
 230         dbh = udf_tgetblk(inode->i_sb, newblock);
 231         if (!dbh)
 232                 return NULL;
 233         lock_buffer(dbh);
 234         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 235         set_buffer_uptodate(dbh);
 236         unlock_buffer(dbh);
 237         mark_buffer_dirty_inode(dbh, inode);
 238
 239         sfibh.soffset = sfibh.eoffset = (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2;
 240         sbh = sfibh.sbh = sfibh.ebh = NULL;
 241         dfibh.soffset = dfibh.eoffset = 0;
 242         dfibh.sbh = dfibh.ebh = dbh;
 243         while ( (f_pos < size) )
 244         {
 245                 UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 246                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL, NULL, NULL, NULL, NULL, NULL);
 247                 if (!sfi)
 248                 {
 249                         udf_release_data(dbh);
 250                         return NULL;
 251                 }
 252                 UDF_I_ALLOCTYPE(inode) = alloctype;
 253                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 254                 dfibh.soffset = dfibh.eoffset;
 255                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 256                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 257                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 258                         sfi->fileIdent + le16_to_cpu(sfi->lengthOfImpUse)))
 259                 {
 260                         UDF_I_ALLOCTYPE(inode) = ICBTAG_FLAG_AD_IN_ICB;
 261                         udf_release_data(dbh);
 262                         return NULL;
 263                 }
 264         }
 265         mark_buffer_dirty_inode(dbh, inode);
 266
 267         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode), 0, UDF_I_LENALLOC(inode));
 268         UDF_I_LENALLOC(inode) = 0;
 269         bloc = UDF_I_LOCATION(inode);
 270         eloc.logicalBlockNum = *block;
 271         eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 272         elen = inode->i_size;
 273         UDF_I_LENEXTENTS(inode) = elen;
 274         extoffset = udf_file_entry_alloc_offset(inode);
 275         udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &sbh, 0);
 276         /* UniqueID stuff */
 277
 278         udf_release_data(sbh);
 279         mark_inode_dirty(inode);
 280         return dbh;
 281 }
 282
 283 static int udf_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create)
 284 {
 285         int err, new;
 286         struct buffer_head *bh;
 287         unsigned long phys;
 288
 289         if (!create)
 290         {
 291                 phys = udf_block_map(inode, block);
 292                 if (phys)
 293                         map_bh(bh_result, inode->i_sb, phys);
 294                 return 0;
 295         }
 296
 297         err = -EIO;
 298         new = 0;
 299         bh = NULL;
 300
 301         lock_kernel();
 302
 303         if (block < 0)
 304                 goto abort_negative;
 305
 306         if (block == UDF_I_NEXT_ALLOC_BLOCK(inode) + 1)
 307         {
 308                 UDF_I_NEXT_ALLOC_BLOCK(inode) ++;
 309                 UDF_I_NEXT_ALLOC_GOAL(inode) ++;
 310         }
 311
 312         err = 0;
 313
 314         bh = inode_getblk(inode, block, &err, &phys, &new);
 315         BUG_ON(bh);
 316         if (err)
 317                 goto abort;
 318         BUG_ON(!phys);
 319
 320         if (new)
 321                 set_buffer_new(bh_result);
 322         map_bh(bh_result, inode->i_sb, phys);
 323 abort:
 324         unlock_kernel();
 325         return err;
 326
 327 abort_negative:
 328         udf_warning(inode->i_sb, "udf_get_block", "block < 0");
 329         goto abort;
 330 }
 331
 332 static struct buffer_head *
 333 udf_getblk(struct inode *inode, long block, int create, int *err)
 334 {
 335         struct buffer_head dummy;
 336
 337         dummy.b_state = 0;
 338         dummy.b_blocknr = -1000;
 339         *err = udf_get_block(inode, block, &dummy, create);
 340         if (!*err && buffer_mapped(&dummy))
 341         {
 342                 struct buffer_head *bh;
 343                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 344                 if (buffer_new(&dummy))
 345                 {
 346                         lock_buffer(bh);
 347                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 348                         set_buffer_uptodate(bh);
 349                         unlock_buffer(bh);
 350                         mark_buffer_dirty_inode(bh, inode);
 351                 }
 352                 return bh;
 353         }
 354         return NULL;
 355 }
 356
 357 static struct buffer_head * inode_getblk(struct inode * inode, long block,
 358         int *err, long *phys, int *new)
 359 {
 360         struct buffer_head *pbh = NULL, *cbh = NULL, *nbh = NULL, *result = NULL;
 361         kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 362         uint32_t pextoffset = 0, cextoffset = 0, nextoffset = 0;
 363         int count = 0, startnum = 0, endnum = 0;
 364         uint32_t elen = 0;
 365         kernel_lb_addr eloc, pbloc, cbloc, nbloc;
 366         int c = 1;
 367         uint64_t lbcount = 0, b_off = 0;
 368         uint32_t newblocknum, newblock, offset = 0;
 369         int8_t etype;
 370         int goal = 0, pgoal = UDF_I_LOCATION(inode).logicalBlockNum;
 371         char lastblock = 0;
 372
 373         pextoffset = cextoffset = nextoffset = udf_file_entry_alloc_offset(inode);
 374         b_off = (uint64_t)block << inode->i_sb->s_blocksize_bits;
 375         pbloc = cbloc = nbloc = UDF_I_LOCATION(inode);
 376
 377         /* find the extent which contains the block we are looking for.
 378        alternate between laarr[0] and laarr[1] for locations of the
 379        current extent, and the previous extent */
 380         do
 381         {
 382                 if (pbh != cbh)
 383                 {
 384                         udf_release_data(pbh);
 385                         atomic_inc(&cbh->b_count);
 386                         pbh = cbh;
 387                 }
 388                 if (cbh != nbh)
 389                 {
 390                         udf_release_data(cbh);
 391                         atomic_inc(&nbh->b_count);
 392                         cbh = nbh;
 393                 }
 394
 395                 lbcount += elen;
 396
 397                 pbloc = cbloc;
 398                 cbloc = nbloc;
 399
 400                 pextoffset = cextoffset;
 401                 cextoffset = nextoffset;
 402
 403                 if ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) == -1)
 404                         break;
 405
 406                 c = !c;
 407
 408                 laarr[c].extLength = (etype << 30) | elen;
 409                 laarr[c].extLocation = eloc;
 410
 411                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 412                         pgoal = eloc.logicalBlockNum +
 413                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 414                                 inode->i_sb->s_blocksize_bits);
 415
 416                 count ++;
 417         } while (lbcount + elen <= b_off);
 418
 419         b_off -= lbcount;
 420         offset = b_off >> inode->i_sb->s_blocksize_bits;
 421
 422         /* if the extent is allocated and recorded, return the block
 423        if the extent is not a multiple of the blocksize, round up */
 424
 425         if (etype == (EXT_RECORDED_ALLOCATED >> 30))
 426         {
 427                 if (elen & (inode->i_sb->s_blocksize - 1))
 428                 {
 429                         elen = EXT_RECORDED_ALLOCATED |
 430                                 ((elen + inode->i_sb->s_blocksize - 1) &
 431                                 ~(inode->i_sb->s_blocksize - 1));
 432                         etype = udf_write_aext(inode, nbloc, &cextoffset, eloc, elen, nbh, 1);
 433                 }
 434                 udf_release_data(pbh);
 435                 udf_release_data(cbh);
 436                 udf_release_data(nbh);
 437                 newblock = udf_get_lb_pblock(inode->i_sb, eloc, offset);
 438                 *phys = newblock;
 439                 return NULL;
 440         }
 441
 442         if (etype == -1)
 443         {
 444                 endnum = startnum = ((count > 1) ? 1 : count);
 445                 if (laarr[c].extLength & (inode->i_sb->s_blocksize - 1))
 446                 {
 447                         laarr[c].extLength =
 448                                 (laarr[c].extLength & UDF_EXTENT_FLAG_MASK) |
 449                                 (((laarr[c].extLength & UDF_EXTENT_LENGTH_MASK) +
 450                                         inode->i_sb->s_blocksize - 1) &
 451                                 ~(inode->i_sb->s_blocksize - 1));
 452                         UDF_I_LENEXTENTS(inode) =
 453                                 (UDF_I_LENEXTENTS(inode) + inode->i_sb->s_blocksize - 1) &
 454                                         ~(inode->i_sb->s_blocksize - 1);
 455                 }
 456                 c = !c;
 457                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 458                         ((offset + 1) << inode->i_sb->s_blocksize_bits);
 459                 memset(&laarr[c].extLocation, 0x00, sizeof(kernel_lb_addr));
 460                 count ++;
 461                 endnum ++;
 462                 lastblock = 1;
 463         }
 464         else
 465                 endnum = startnum = ((count > 2) ? 2 : count);
 466
 467         /* if the current extent is in position 0, swap it with the previous */
 468         if (!c && count != 1)
 469         {
 470                 laarr[2] = laarr[0];
 471                 laarr[0] = laarr[1];
 472                 laarr[1] = laarr[2];
 473                 c = 1;
 474         }
 475
 476         /* if the current block is located in a extent, read the next extent */
 477         if (etype != -1)
 478         {
 479                 if ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 0)) != -1)
 480                 {
 481                         laarr[c+1].extLength = (etype << 30) | elen;
 482                         laarr[c+1].extLocation = eloc;
 483                         count ++;
 484                         startnum ++;
 485                         endnum ++;
 486                 }
 487                 else
 488                         lastblock = 1;
 489         }
 490         udf_release_data(cbh);
 491         udf_release_data(nbh);
 492
 493         /* if the current extent is not recorded but allocated, get the
 494                 block in the extent corresponding to the requested block */
 495         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 496                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 497         else /* otherwise, allocate a new block */
 498         {
 499                 if (UDF_I_NEXT_ALLOC_BLOCK(inode) == block)
 500                         goal = UDF_I_NEXT_ALLOC_GOAL(inode);
 501
 502                 if (!goal)
 503                 {
 504                         if (!(goal = pgoal))
 505                                 goal = UDF_I_LOCATION(inode).logicalBlockNum + 1;
 506                 }
 507
 508                 if (!(newblocknum = udf_new_block(inode->i_sb, inode,
 509                         UDF_I_LOCATION(inode).partitionReferenceNum, goal, err)))
 510                 {
 511                         udf_release_data(pbh);
 512                         *err = -ENOSPC;
 513                         return NULL;
 514                 }
 515                 UDF_I_LENEXTENTS(inode) += inode->i_sb->s_blocksize;
 516         }
 517
 518         /* if the extent the requsted block is located in contains multiple blocks,
 519        split the extent into at most three extents. blocks prior to requested
 520        block, requested block, and blocks after requested block */
 521         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 522
 523 #ifdef UDF_PREALLOCATE
 524         /* preallocate blocks */
 525         udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 526 #endif
 527
 528         /* merge any continuous blocks in laarr */
 529         udf_merge_extents(inode, laarr, &endnum);
 530
 531         /* write back the new extents, inserting new extents if the new number
 532        of extents is greater than the old number, and deleting extents if
 533        the new number of extents is less than the old number */
 534         udf_update_extents(inode, laarr, startnum, endnum, pbloc, pextoffset, &pbh);
 535
 536         udf_release_data(pbh);
 537
 538         if (!(newblock = udf_get_pblock(inode->i_sb, newblocknum,
 539                 UDF_I_LOCATION(inode).partitionReferenceNum, 0)))
 540         {
 541                 return NULL;
 542         }
 543         *phys = newblock;
 544         *err = 0;
 545         *new = 1;
 546         UDF_I_NEXT_ALLOC_BLOCK(inode) = block;
 547         UDF_I_NEXT_ALLOC_GOAL(inode) = newblocknum;
 548         inode->i_ctime = current_fs_time(inode->i_sb);
 549
 550         if (IS_SYNC(inode))
 551                 udf_sync_inode(inode);
 552         else
 553                 mark_inode_dirty(inode);
 554         return result;
 555 }
 556
 557 static void udf_split_extents(struct inode *inode, int *c, int offset, int newblocknum,
 558         kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 559 {
 560         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 561                 (laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 562         {
 563                 int curr = *c;
 564                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 565                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 566                 int8_t etype = (laarr[curr].extLength >> 30);
 567
 568                 if (blen == 1)
 569                         ;
 570                 else if (!offset || blen == offset + 1)
 571                 {
 572                         laarr[curr+2] = laarr[curr+1];
 573                         laarr[curr+1] = laarr[curr];
 574                 }
 575                 else
 576                 {
 577                         laarr[curr+3] = laarr[curr+1];
 578                         laarr[curr+2] = laarr[curr+1] = laarr[curr];
 579                 }
 580
 581                 if (offset)
 582                 {
 583                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 584                         {
 585                                 udf_free_blocks(inode->i_sb, inode, laarr[curr].extLocation, 0, offset);
 586                                 laarr[curr].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 587                                         (offset << inode->i_sb->s_blocksize_bits);
 588                                 laarr[curr].extLocation.logicalBlockNum = 0;
 589                                 laarr[curr].extLocation.partitionReferenceNum = 0;
 590                         }
 591                         else
 592                                 laarr[curr].extLength = (etype << 30) |
 593                                         (offset << inode->i_sb->s_blocksize_bits);
 594                         curr ++;
 595                         (*c) ++;
 596                         (*endnum) ++;
 597                 }
 598
 599                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 600                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 601                         laarr[curr].extLocation.partitionReferenceNum =
 602                                 UDF_I_LOCATION(inode).partitionReferenceNum;
 603                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 604                         inode->i_sb->s_blocksize;
 605                 curr ++;
 606
 607                 if (blen != offset + 1)
 608                 {
 609                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 610                                 laarr[curr].extLocation.logicalBlockNum += (offset + 1);
 611                         laarr[curr].extLength = (etype << 30) |
 612                                 ((blen - (offset + 1)) << inode->i_sb->s_blocksize_bits);
 613                         curr ++;
 614                         (*endnum) ++;
 615                 }
 616         }
 617 }
 618
 619 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 620          kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 621 {
 622         int start, length = 0, currlength = 0, i;
 623
 624         if (*endnum >= (c+1))
 625         {
 626                 if (!lastblock)
 627                         return;
 628                 else
 629                         start = c;
 630         }
 631         else
 632         {
 633                 if ((laarr[c+1].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 634                 {
 635                         start = c+1;
 636                         length = currlength = (((laarr[c+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 637                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 638                 }
 639                 else
 640                         start = c;
 641         }
 642
 643         for (i=start+1; i<=*endnum; i++)
 644         {
 645                 if (i == *endnum)
 646                 {
 647                         if (lastblock)
 648                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 649                 }
 650                 else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 651                         length += (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 652                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 653                 else
 654                         break;
 655         }
 656
 657         if (length)
 658         {
 659                 int next = laarr[start].extLocation.logicalBlockNum +
 660                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 661                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 662                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 663                         laarr[start].extLocation.partitionReferenceNum,
 664                         next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ? length :
 665                                 UDF_DEFAULT_PREALLOC_BLOCKS) - currlength);
 666
 667                 if (numalloc)
 668                 {
 669                         if (start == (c+1))
 670                                 laarr[start].extLength +=
 671                                         (numalloc << inode->i_sb->s_blocksize_bits);
 672                         else
 673                         {
 674                                 memmove(&laarr[c+2], &laarr[c+1],
 675                                         sizeof(long_ad) * (*endnum - (c+1)));
 676                                 (*endnum) ++;
 677                                 laarr[c+1].extLocation.logicalBlockNum = next;
 678                                 laarr[c+1].extLocation.partitionReferenceNum =
 679                                         laarr[c].extLocation.partitionReferenceNum;
 680                                 laarr[c+1].extLength = EXT_NOT_RECORDED_ALLOCATED |
 681                                         (numalloc << inode->i_sb->s_blocksize_bits);
 682                                 start = c+1;
 683                         }
 684
 685                         for (i=start+1; numalloc && i<*endnum; i++)
 686                         {
 687                                 int elen = ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 688                                         inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 689
 690                                 if (elen > numalloc)
 691                                 {
 692                                         laarr[i].extLength -=
 693                                                 (numalloc << inode->i_sb->s_blocksize_bits);
 694                                         numalloc = 0;
 695                                 }
 696                                 else
 697                                 {
 698                                         numalloc -= elen;
 699                                         if (*endnum > (i+1))
 700                                                 memmove(&laarr[i], &laarr[i+1],
 701                                                         sizeof(long_ad) * (*endnum - (i+1)));
 702                                         i --;
 703                                         (*endnum) --;
 704                                 }
 705                         }
 706                         UDF_I_LENEXTENTS(inode) += numalloc << inode->i_sb->s_blocksize_bits;
 707                 }
 708         }
 709 }
 710
 711 static void udf_merge_extents(struct inode *inode,
 712          kernel_long_ad laarr[EXTENT_MERGE_SIZE], int *endnum)
 713 {
 714         int i;
 715
 716         for (i=0; i<(*endnum-1); i++)
 717         {
 718                 if ((laarr[i].extLength >> 30) == (laarr[i+1].extLength >> 30))
 719                 {
 720                         if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 721                                 ((laarr[i+1].extLocation.logicalBlockNum - laarr[i].extLocation.logicalBlockNum) ==
 722                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 723                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits)))
 724                         {
 725                                 if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 726                                         (laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 727                                         inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
 728                                 {
 729                                         laarr[i+1].extLength = (laarr[i+1].extLength -
 730                                                 (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 731                                                 UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
 732                                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 733                                                 (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 734                                         laarr[i+1].extLocation.logicalBlockNum =
 735                                                 laarr[i].extLocation.logicalBlockNum +
 736                                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) >>
 737                                                         inode->i_sb->s_blocksize_bits);
 738                                 }
 739                                 else
 740                                 {
 741                                         laarr[i].extLength = laarr[i+1].extLength +
 742                                                 (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 743                                                 inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
 744                                         if (*endnum > (i+2))
 745                                                 memmove(&laarr[i+1], &laarr[i+2],
 746                                                         sizeof(long_ad) * (*endnum - (i+2)));
 747                                         i --;
 748                                         (*endnum) --;
 749                                 }
 750                         }
 751                 }
 752                 else if (((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 753                         ((laarr[i+1].extLength >> 30) == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)))
 754                 {
 755                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 756                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 757                                 inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 758                         laarr[i].extLocation.logicalBlockNum = 0;
 759                         laarr[i].extLocation.partitionReferenceNum = 0;
 760
 761                         if (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 762                                 (laarr[i+1].extLength & UDF_EXTENT_LENGTH_MASK) +
 763                                 inode->i_sb->s_blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK)
 764                         {
 765                                 laarr[i+1].extLength = (laarr[i+1].extLength -
 766                                         (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 767                                         UDF_EXTENT_LENGTH_MASK) & ~(inode->i_sb->s_blocksize-1);
 768                                 laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_FLAG_MASK) +
 769                                         (UDF_EXTENT_LENGTH_MASK + 1) - inode->i_sb->s_blocksize;
 770                         }
 771                         else
 772                         {
 773                                 laarr[i].extLength = laarr[i+1].extLength +
 774                                         (((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 775                                         inode->i_sb->s_blocksize - 1) & ~(inode->i_sb->s_blocksize-1));
 776                                 if (*endnum > (i+2))
 777                                         memmove(&laarr[i+1], &laarr[i+2],
 778                                                 sizeof(long_ad) * (*endnum - (i+2)));
 779                                 i --;
 780                                 (*endnum) --;
 781                         }
 782                 }
 783                 else if ((laarr[i].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 784                 {
 785                         udf_free_blocks(inode->i_sb, inode, laarr[i].extLocation, 0,
 786                                 ((laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) +
 787                                inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits);
 788                         laarr[i].extLocation.logicalBlockNum = 0;
 789                         laarr[i].extLocation.partitionReferenceNum = 0;
 790                         laarr[i].extLength = (laarr[i].extLength & UDF_EXTENT_LENGTH_MASK) |
 791                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 792                 }
 793         }
 794 }
 795
 796 static void udf_update_extents(struct inode *inode,
 797         kernel_long_ad laarr[EXTENT_MERGE_SIZE], int startnum, int endnum,
 798         kernel_lb_addr pbloc, uint32_t pextoffset, struct buffer_head **pbh)
 799 {
 800         int start = 0, i;
 801         kernel_lb_addr tmploc;
 802         uint32_t tmplen;
 803
 804         if (startnum > endnum)
 805         {
 806                 for (i=0; i<(startnum-endnum); i++)
 807                 {
 808                         udf_delete_aext(inode, pbloc, pextoffset, laarr[i].extLocation,
 809                                 laarr[i].extLength, *pbh);
 810                 }
 811         }
 812         else if (startnum < endnum)
 813         {
 814                 for (i=0; i<(endnum-startnum); i++)
 815                 {
 816                         udf_insert_aext(inode, pbloc, pextoffset, laarr[i].extLocation,
 817                                 laarr[i].extLength, *pbh);
 818                         udf_next_aext(inode, &pbloc, &pextoffset, &laarr[i].extLocation,
 819                                 &laarr[i].extLength, pbh, 1);
 820                         start ++;
 821                 }
 822         }
 823
 824         for (i=start; i<endnum; i++)
 825         {
 826                 udf_next_aext(inode, &pbloc, &pextoffset, &tmploc, &tmplen, pbh, 0);
 827                 udf_write_aext(inode, pbloc, &pextoffset, laarr[i].extLocation,
 828                         laarr[i].extLength, *pbh, 1);
 829         }
 830 }
 831
 832 struct buffer_head * udf_bread(struct inode * inode, int block,
 833         int create, int * err)
 834 {
 835         struct buffer_head * bh = NULL;
 836
 837         bh = udf_getblk(inode, block, create, err);
 838         if (!bh)
 839                 return NULL;
 840
 841         if (buffer_uptodate(bh))
 842                 return bh;
 843         ll_rw_block(READ, 1, &bh);
 844         wait_on_buffer(bh);
 845         if (buffer_uptodate(bh))
 846                 return bh;
 847         brelse(bh);
 848         *err = -EIO;
 849         return NULL;
 850 }
 851
 852 void udf_truncate(struct inode * inode)
 853 {
 854         int offset;
 855         int err;
 856
 857         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
 858                         S_ISLNK(inode->i_mode)))
 859                 return;
 860         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
 861                 return;
 862
 863         lock_kernel();
 864         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 865         {
 866                 if (inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
 867                         inode->i_size))
 868                 {
 869                         udf_expand_file_adinicb(inode, inode->i_size, &err);
 870                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 871                         {
 872                                 inode->i_size = UDF_I_LENALLOC(inode);
 873                                 unlock_kernel();
 874                                 return;
 875                         }
 876                         else
 877                                 udf_truncate_extents(inode);
 878                 }
 879                 else
 880                 {
 881                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
 882                         memset(UDF_I_DATA(inode) + UDF_I_LENEATTR(inode) + offset, 0x00, inode->i_sb->s_blocksize - offset - udf_file_entry_alloc_offset(inode));
 883                         UDF_I_LENALLOC(inode) = inode->i_size;
 884                 }
 885         }
 886         else
 887         {
 888                 block_truncate_page(inode->i_mapping, inode->i_size, udf_get_block);
 889                 udf_truncate_extents(inode);
 890         }
 891
 892         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
 893         if (IS_SYNC(inode))
 894                 udf_sync_inode (inode);
 895         else
 896                 mark_inode_dirty(inode);
 897         unlock_kernel();
 898 }
 899
 900 static void
 901 __udf_read_inode(struct inode *inode)
 902 {
 903         struct buffer_head *bh = NULL;
 904         struct fileEntry *fe;
 905         uint16_t ident;
 906
 907         /*
 908          * Set defaults, but the inode is still incomplete!
 909          * Note: get_new_inode() sets the following on a new inode:
 910          *      i_sb = sb
 911          *      i_no = ino
 912          *      i_flags = sb->s_flags
 913          *      i_state = 0
 914          * clean_inode(): zero fills and sets
 915          *      i_count = 1
 916          *      i_nlink = 1
 917          *      i_op = NULL;
 918          */
 919         bh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 0, &ident);
 920
 921         if (!bh)
 922         {
 923                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
 924                         inode->i_ino);
 925                 make_bad_inode(inode);
 926                 return;
 927         }
 928
 929         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
 930                 ident != TAG_IDENT_USE)
 931         {
 932                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed ident=%d\n",
 933                         inode->i_ino, ident);
 934                 udf_release_data(bh);
 935                 make_bad_inode(inode);
 936                 return;
 937         }
 938
 939         fe = (struct fileEntry *)bh->b_data;
 940
 941         if (le16_to_cpu(fe->icbTag.strategyType) == 4096)
 942         {
 943                 struct buffer_head *ibh = NULL, *nbh = NULL;
 944                 struct indirectEntry *ie;
 945
 946                 ibh = udf_read_ptagged(inode->i_sb, UDF_I_LOCATION(inode), 1, &ident);
 947                 if (ident == TAG_IDENT_IE)
 948                 {
 949                         if (ibh)
 950                         {
 951                                 kernel_lb_addr loc;
 952                                 ie = (struct indirectEntry *)ibh->b_data;
 953
 954                                 loc = lelb_to_cpu(ie->indirectICB.extLocation);
 955
 956                                 if (ie->indirectICB.extLength &&
 957                                         (nbh = udf_read_ptagged(inode->i_sb, loc, 0, &ident)))
 958                                 {
 959                                         if (ident == TAG_IDENT_FE ||
 960                                                 ident == TAG_IDENT_EFE)
 961                                         {
 962                                                 memcpy(&UDF_I_LOCATION(inode), &loc, sizeof(kernel_lb_addr));
 963                                                 udf_release_data(bh);
 964                                                 udf_release_data(ibh);
 965                                                 udf_release_data(nbh);
 966                                                 __udf_read_inode(inode);
 967                                                 return;
 968                                         }
 969                                         else
 970                                         {
 971                                                 udf_release_data(nbh);
 972                                                 udf_release_data(ibh);
 973                                         }
 974                                 }
 975                                 else
 976                                         udf_release_data(ibh);
 977                         }
 978                 }
 979                 else
 980                         udf_release_data(ibh);
 981         }
 982         else if (le16_to_cpu(fe->icbTag.strategyType) != 4)
 983         {
 984                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
 985                         le16_to_cpu(fe->icbTag.strategyType));
 986                 udf_release_data(bh);
 987                 make_bad_inode(inode);
 988                 return;
 989         }
 990         udf_fill_inode(inode, bh);
 991         udf_release_data(bh);
 992 }
 993
 994 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 995 {
 996         struct fileEntry *fe;
 997         struct extendedFileEntry *efe;
 998         time_t convtime;
 999         long convtime_usec;
1000         int offset;
1001
1002         fe = (struct fileEntry *)bh->b_data;
1003         efe = (struct extendedFileEntry *)bh->b_data;
1004
1005         if (le16_to_cpu(fe->icbTag.strategyType) == 4)
1006                 UDF_I_STRAT4096(inode) = 0;
1007         else /* if (le16_to_cpu(fe->icbTag.strategyType) == 4096) */
1008                 UDF_I_STRAT4096(inode) = 1;
1009
1010         UDF_I_ALLOCTYPE(inode) = le16_to_cpu(fe->icbTag.flags) & ICBTAG_FLAG_AD_MASK;
1011         UDF_I_UNIQUE(inode) = 0;
1012         UDF_I_LENEATTR(inode) = 0;
1013         UDF_I_LENEXTENTS(inode) = 0;
1014         UDF_I_LENALLOC(inode) = 0;
1015         UDF_I_NEXT_ALLOC_BLOCK(inode) = 0;
1016         UDF_I_NEXT_ALLOC_GOAL(inode) = 0;
1017         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_EFE)
1018         {
1019                 UDF_I_EFE(inode) = 1;
1020                 UDF_I_USE(inode) = 0;
1021                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry), GFP_KERNEL);
1022                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct extendedFileEntry), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1023         }
1024         else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_FE)
1025         {
1026                 UDF_I_EFE(inode) = 0;
1027                 UDF_I_USE(inode) = 0;
1028                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct fileEntry), GFP_KERNEL);
1029                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct fileEntry), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1030         }
1031         else if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
1032         {
1033                 UDF_I_EFE(inode) = 0;
1034                 UDF_I_USE(inode) = 1;
1035                 UDF_I_LENALLOC(inode) =
1036                         le32_to_cpu(
1037                                 ((struct unallocSpaceEntry *)bh->b_data)->lengthAllocDescs);
1038                 UDF_I_DATA(inode) = kmalloc(inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry), GFP_KERNEL);
1039                 memcpy(UDF_I_DATA(inode), bh->b_data + sizeof(struct unallocSpaceEntry), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1040                 return;
1041         }
1042
1043         inode->i_uid = le32_to_cpu(fe->uid);
1044         if (inode->i_uid == -1 || UDF_QUERY_FLAG(inode->i_sb,
1045                                         UDF_FLAG_UID_IGNORE))
1046                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1047
1048         inode->i_gid = le32_to_cpu(fe->gid);
1049         if (inode->i_gid == -1 || UDF_QUERY_FLAG(inode->i_sb,
1050                                         UDF_FLAG_GID_IGNORE))
1051                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1052
1053         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1054         if (!inode->i_nlink)
1055                 inode->i_nlink = 1;
1056
1057         inode->i_size = le64_to_cpu(fe->informationLength);
1058         UDF_I_LENEXTENTS(inode) = inode->i_size;
1059
1060         inode->i_mode = udf_convert_permissions(fe);
1061         inode->i_mode &= ~UDF_SB(inode->i_sb)->s_umask;
1062
1063         if (UDF_I_EFE(inode) == 0)
1064         {
1065                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1066                         (inode->i_sb->s_blocksize_bits - 9);
1067
1068                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1069                         lets_to_cpu(fe->accessTime)) )
1070                 {
1071                         inode->i_atime.tv_sec = convtime;
1072                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1073                 }
1074                 else
1075                 {
1076                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1077                 }
1078
1079                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1080                         lets_to_cpu(fe->modificationTime)) )
1081                 {
1082                         inode->i_mtime.tv_sec = convtime;
1083                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1084                 }
1085                 else
1086                 {
1087                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1088                 }
1089
1090                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1091                         lets_to_cpu(fe->attrTime)) )
1092                 {
1093                         inode->i_ctime.tv_sec = convtime;
1094                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1095                 }
1096                 else
1097                 {
1098                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1099                 }
1100
1101                 UDF_I_UNIQUE(inode) = le64_to_cpu(fe->uniqueID);
1102                 UDF_I_LENEATTR(inode) = le32_to_cpu(fe->lengthExtendedAttr);
1103                 UDF_I_LENALLOC(inode) = le32_to_cpu(fe->lengthAllocDescs);
1104                 offset = sizeof(struct fileEntry) + UDF_I_LENEATTR(inode);
1105         }
1106         else
1107         {
1108                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1109                         (inode->i_sb->s_blocksize_bits - 9);
1110
1111                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1112                         lets_to_cpu(efe->accessTime)) )
1113                 {
1114                         inode->i_atime.tv_sec = convtime;
1115                         inode->i_atime.tv_nsec = convtime_usec * 1000;
1116                 }
1117                 else
1118                 {
1119                         inode->i_atime = UDF_SB_RECORDTIME(inode->i_sb);
1120                 }
1121
1122                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1123                         lets_to_cpu(efe->modificationTime)) )
1124                 {
1125                         inode->i_mtime.tv_sec = convtime;
1126                         inode->i_mtime.tv_nsec = convtime_usec * 1000;
1127                 }
1128                 else
1129                 {
1130                         inode->i_mtime = UDF_SB_RECORDTIME(inode->i_sb);
1131                 }
1132
1133                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1134                         lets_to_cpu(efe->createTime)) )
1135                 {
1136                         UDF_I_CRTIME(inode).tv_sec = convtime;
1137                         UDF_I_CRTIME(inode).tv_nsec = convtime_usec * 1000;
1138                 }
1139                 else
1140                 {
1141                         UDF_I_CRTIME(inode) = UDF_SB_RECORDTIME(inode->i_sb);
1142                 }
1143
1144                 if ( udf_stamp_to_time(&convtime, &convtime_usec,
1145                         lets_to_cpu(efe->attrTime)) )
1146                 {
1147                         inode->i_ctime.tv_sec = convtime;
1148                         inode->i_ctime.tv_nsec = convtime_usec * 1000;
1149                 }
1150                 else
1151                 {
1152                         inode->i_ctime = UDF_SB_RECORDTIME(inode->i_sb);
1153                 }
1154
1155                 UDF_I_UNIQUE(inode) = le64_to_cpu(efe->uniqueID);
1156                 UDF_I_LENEATTR(inode) = le32_to_cpu(efe->lengthExtendedAttr);
1157                 UDF_I_LENALLOC(inode) = le32_to_cpu(efe->lengthAllocDescs);
1158                 offset = sizeof(struct extendedFileEntry) + UDF_I_LENEATTR(inode);
1159         }
1160
1161         switch (fe->icbTag.fileType)
1162         {
1163                 case ICBTAG_FILE_TYPE_DIRECTORY:
1164                 {
1165                         inode->i_op = &udf_dir_inode_operations;
1166                         inode->i_fop = &udf_dir_operations;
1167                         inode->i_mode |= S_IFDIR;
1168                         inode->i_nlink ++;
1169                         break;
1170                 }
1171                 case ICBTAG_FILE_TYPE_REALTIME:
1172                 case ICBTAG_FILE_TYPE_REGULAR:
1173                 case ICBTAG_FILE_TYPE_UNDEF:
1174                 {
1175                         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1176                                 inode->i_data.a_ops = &udf_adinicb_aops;
1177                         else
1178                                 inode->i_data.a_ops = &udf_aops;
1179                         inode->i_op = &udf_file_inode_operations;
1180                         inode->i_fop = &udf_file_operations;
1181                         inode->i_mode |= S_IFREG;
1182                         break;
1183                 }
1184                 case ICBTAG_FILE_TYPE_BLOCK:
1185                 {
1186                         inode->i_mode |= S_IFBLK;
1187                         break;
1188                 }
1189                 case ICBTAG_FILE_TYPE_CHAR:
1190                 {
1191                         inode->i_mode |= S_IFCHR;
1192                         break;
1193                 }
1194                 case ICBTAG_FILE_TYPE_FIFO:
1195                 {
1196                         init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1197                         break;
1198                 }
1199                 case ICBTAG_FILE_TYPE_SOCKET:
1200                 {
1201                         init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1202                         break;
1203                 }
1204                 case ICBTAG_FILE_TYPE_SYMLINK:
1205                 {
1206                         inode->i_data.a_ops = &udf_symlink_aops;
1207                         inode->i_op = &page_symlink_inode_operations;
1208                         inode->i_mode = S_IFLNK|S_IRWXUGO;
1209                         break;
1210                 }
1211                 default:
1212                 {
1213                         printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown file type=%d\n",
1214                                 inode->i_ino, fe->icbTag.fileType);
1215                         make_bad_inode(inode);
1216                         return;
1217                 }
1218         }
1219         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1220         {
1221                 struct deviceSpec *dsea =
1222                         (struct deviceSpec *)
1223                                 udf_get_extendedattr(inode, 12, 1);
1224
1225                 if (dsea)
1226                 {
1227                         init_special_inode(inode, inode->i_mode, MKDEV(
1228                                 le32_to_cpu(dsea->majorDeviceIdent),
1229                                 le32_to_cpu(dsea->minorDeviceIdent)));
1230                         /* Developer ID ??? */
1231                 }
1232                 else
1233                 {
1234                         make_bad_inode(inode);
1235                 }
1236         }
1237 }
1238
1239 static mode_t
1240 udf_convert_permissions(struct fileEntry *fe)
1241 {
1242         mode_t mode;
1243         uint32_t permissions;
1244         uint32_t flags;
1245
1246         permissions = le32_to_cpu(fe->permissions);
1247         flags = le16_to_cpu(fe->icbTag.flags);
1248
1249         mode =  (( permissions      ) & S_IRWXO) |
1250                 (( permissions >> 2 ) & S_IRWXG) |
1251                 (( permissions >> 4 ) & S_IRWXU) |
1252                 (( flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1253                 (( flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1254                 (( flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1255
1256         return mode;
1257 }
1258
1259 /*
1260  * udf_write_inode
1261  *
1262  * PURPOSE
1263  *      Write out the specified inode.
1264  *
1265  * DESCRIPTION
1266  *      This routine is called whenever an inode is synced.
1267  *      Currently this routine is just a placeholder.
1268  *
1269  * HISTORY
1270  *      July 1, 1997 - Andrew E. Mileski
1271  *      Written, tested, and released.
1272  */
1273
1274 int udf_write_inode(struct inode * inode, int sync)
1275 {
1276         int ret;
1277         lock_kernel();
1278         ret = udf_update_inode(inode, sync);
1279         unlock_kernel();
1280         return ret;
1281 }
1282
1283 int udf_sync_inode(struct inode * inode)
1284 {
1285         return udf_update_inode(inode, 1);
1286 }
1287
1288 static int
1289 udf_update_inode(struct inode *inode, int do_sync)
1290 {
1291         struct buffer_head *bh = NULL;
1292         struct fileEntry *fe;
1293         struct extendedFileEntry *efe;
1294         uint32_t udfperms;
1295         uint16_t icbflags;
1296         uint16_t crclen;
1297         int i;
1298         kernel_timestamp cpu_time;
1299         int err = 0;
1300
1301         bh = udf_tread(inode->i_sb,
1302                 udf_get_lb_pblock(inode->i_sb, UDF_I_LOCATION(inode), 0));
1303
1304         if (!bh)
1305         {
1306                 udf_debug("bread failure\n");
1307                 return -EIO;
1308         }
1309
1310         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1311
1312         fe = (struct fileEntry *)bh->b_data;
1313         efe = (struct extendedFileEntry *)bh->b_data;
1314
1315         if (le16_to_cpu(fe->descTag.tagIdent) == TAG_IDENT_USE)
1316         {
1317                 struct unallocSpaceEntry *use =
1318                         (struct unallocSpaceEntry *)bh->b_data;
1319
1320                 use->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1321                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct unallocSpaceEntry));
1322                 crclen = sizeof(struct unallocSpaceEntry) + UDF_I_LENALLOC(inode) -
1323                         sizeof(tag);
1324                 use->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1325                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1326                 use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use + sizeof(tag), crclen, 0));
1327
1328                 use->descTag.tagChecksum = 0;
1329                 for (i=0; i<16; i++)
1330                         if (i != 4)
1331                                 use->descTag.tagChecksum += ((uint8_t *)&(use->descTag))[i];
1332
1333                 mark_buffer_dirty(bh);
1334                 udf_release_data(bh);
1335                 return err;
1336         }
1337
1338         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1339                 fe->uid = cpu_to_le32(-1);
1340         else fe->uid = cpu_to_le32(inode->i_uid);
1341
1342         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1343                 fe->gid = cpu_to_le32(-1);
1344         else fe->gid = cpu_to_le32(inode->i_gid);
1345
1346         udfperms =      ((inode->i_mode & S_IRWXO)     ) |
1347                         ((inode->i_mode & S_IRWXG) << 2) |
1348                         ((inode->i_mode & S_IRWXU) << 4);
1349
1350         udfperms |=     (le32_to_cpu(fe->permissions) &
1351                         (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1352                          FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1353                          FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1354         fe->permissions = cpu_to_le32(udfperms);
1355
1356         if (S_ISDIR(inode->i_mode))
1357                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1358         else
1359                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1360
1361         fe->informationLength = cpu_to_le64(inode->i_size);
1362
1363         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1364         {
1365                 regid *eid;
1366                 struct deviceSpec *dsea =
1367                         (struct deviceSpec *)
1368                                 udf_get_extendedattr(inode, 12, 1);
1369
1370                 if (!dsea)
1371                 {
1372                         dsea = (struct deviceSpec *)
1373                                 udf_add_extendedattr(inode,
1374                                         sizeof(struct deviceSpec) +
1375                                         sizeof(regid), 12, 0x3);
1376                         dsea->attrType = cpu_to_le32(12);
1377                         dsea->attrSubtype = 1;
1378                         dsea->attrLength = cpu_to_le32(sizeof(struct deviceSpec) +
1379                                 sizeof(regid));
1380                         dsea->impUseLength = cpu_to_le32(sizeof(regid));
1381                 }
1382                 eid = (regid *)dsea->impUse;
1383                 memset(eid, 0, sizeof(regid));
1384                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1385                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1386                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1387                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1388                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1389         }
1390
1391         if (UDF_I_EFE(inode) == 0)
1392         {
1393                 memcpy(bh->b_data + sizeof(struct fileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1394                 fe->logicalBlocksRecorded = cpu_to_le64(
1395                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1396                         (inode->i_sb->s_blocksize_bits - 9));
1397
1398                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1399                         fe->accessTime = cpu_to_lets(cpu_time);
1400                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1401                         fe->modificationTime = cpu_to_lets(cpu_time);
1402                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1403                         fe->attrTime = cpu_to_lets(cpu_time);
1404                 memset(&(fe->impIdent), 0, sizeof(regid));
1405                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1406                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1407                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1408                 fe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1409                 fe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1410                 fe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1411                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1412                 crclen = sizeof(struct fileEntry);
1413         }
1414         else
1415         {
1416                 memcpy(bh->b_data + sizeof(struct extendedFileEntry), UDF_I_DATA(inode), inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry));
1417                 efe->objectSize = cpu_to_le64(inode->i_size);
1418                 efe->logicalBlocksRecorded = cpu_to_le64(
1419                         (inode->i_blocks + (1 << (inode->i_sb->s_blocksize_bits - 9)) - 1) >>
1420                         (inode->i_sb->s_blocksize_bits - 9));
1421
1422                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_atime.tv_sec ||
1423                         (UDF_I_CRTIME(inode).tv_sec == inode->i_atime.tv_sec &&
1424                          UDF_I_CRTIME(inode).tv_nsec > inode->i_atime.tv_nsec))
1425                 {
1426                         UDF_I_CRTIME(inode) = inode->i_atime;
1427                 }
1428                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_mtime.tv_sec ||
1429                         (UDF_I_CRTIME(inode).tv_sec == inode->i_mtime.tv_sec &&
1430                          UDF_I_CRTIME(inode).tv_nsec > inode->i_mtime.tv_nsec))
1431                 {
1432                         UDF_I_CRTIME(inode) = inode->i_mtime;
1433                 }
1434                 if (UDF_I_CRTIME(inode).tv_sec > inode->i_ctime.tv_sec ||
1435                         (UDF_I_CRTIME(inode).tv_sec == inode->i_ctime.tv_sec &&
1436                          UDF_I_CRTIME(inode).tv_nsec > inode->i_ctime.tv_nsec))
1437                 {
1438                         UDF_I_CRTIME(inode) = inode->i_ctime;
1439                 }
1440
1441                 if (udf_time_to_stamp(&cpu_time, inode->i_atime))
1442                         efe->accessTime = cpu_to_lets(cpu_time);
1443                 if (udf_time_to_stamp(&cpu_time, inode->i_mtime))
1444                         efe->modificationTime = cpu_to_lets(cpu_time);
1445                 if (udf_time_to_stamp(&cpu_time, UDF_I_CRTIME(inode)))
1446                         efe->createTime = cpu_to_lets(cpu_time);
1447                 if (udf_time_to_stamp(&cpu_time, inode->i_ctime))
1448                         efe->attrTime = cpu_to_lets(cpu_time);
1449
1450                 memset(&(efe->impIdent), 0, sizeof(regid));
1451                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1452                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1453                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1454                 efe->uniqueID = cpu_to_le64(UDF_I_UNIQUE(inode));
1455                 efe->lengthExtendedAttr = cpu_to_le32(UDF_I_LENEATTR(inode));
1456                 efe->lengthAllocDescs = cpu_to_le32(UDF_I_LENALLOC(inode));
1457                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1458                 crclen = sizeof(struct extendedFileEntry);
1459         }
1460         if (UDF_I_STRAT4096(inode))
1461         {
1462                 fe->icbTag.strategyType = cpu_to_le16(4096);
1463                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1464                 fe->icbTag.numEntries = cpu_to_le16(2);
1465         }
1466         else
1467         {
1468                 fe->icbTag.strategyType = cpu_to_le16(4);
1469                 fe->icbTag.numEntries = cpu_to_le16(1);
1470         }
1471
1472         if (S_ISDIR(inode->i_mode))
1473                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1474         else if (S_ISREG(inode->i_mode))
1475                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1476         else if (S_ISLNK(inode->i_mode))
1477                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1478         else if (S_ISBLK(inode->i_mode))
1479                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1480         else if (S_ISCHR(inode->i_mode))
1481                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1482         else if (S_ISFIFO(inode->i_mode))
1483                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1484         else if (S_ISSOCK(inode->i_mode))
1485                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1486
1487         icbflags =      UDF_I_ALLOCTYPE(inode) |
1488                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1489                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1490                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1491                         (le16_to_cpu(fe->icbTag.flags) &
1492                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1493                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1494
1495         fe->icbTag.flags = cpu_to_le16(icbflags);
1496         if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1497                 fe->descTag.descVersion = cpu_to_le16(3);
1498         else
1499                 fe->descTag.descVersion = cpu_to_le16(2);
1500         fe->descTag.tagSerialNum = cpu_to_le16(UDF_SB_SERIALNUM(inode->i_sb));
1501         fe->descTag.tagLocation = cpu_to_le32(UDF_I_LOCATION(inode).logicalBlockNum);
1502         crclen += UDF_I_LENEATTR(inode) + UDF_I_LENALLOC(inode) - sizeof(tag);
1503         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1504         fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag), crclen, 0));
1505
1506         fe->descTag.tagChecksum = 0;
1507         for (i=0; i<16; i++)
1508                 if (i != 4)
1509                         fe->descTag.tagChecksum += ((uint8_t *)&(fe->descTag))[i];
1510
1511         /* write the data blocks */
1512         mark_buffer_dirty(bh);
1513         if (do_sync)
1514         {
1515                 sync_dirty_buffer(bh);
1516                 if (buffer_req(bh) && !buffer_uptodate(bh))
1517                 {
1518                         printk("IO error syncing udf inode [%s:%08lx]\n",
1519                                 inode->i_sb->s_id, inode->i_ino);
1520                         err = -EIO;
1521                 }
1522         }
1523         udf_release_data(bh);
1524         return err;
1525 }
1526
1527 struct inode *
1528 udf_iget(struct super_block *sb, kernel_lb_addr ino)
1529 {
1530         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1531         struct inode *inode = iget_locked(sb, block);
1532
1533         if (!inode)
1534                 return NULL;
1535
1536         if (inode->i_state & I_NEW) {
1537                 memcpy(&UDF_I_LOCATION(inode), &ino, sizeof(kernel_lb_addr));
1538                 __udf_read_inode(inode);
1539                 unlock_new_inode(inode);
1540         }
1541
1542         if (is_bad_inode(inode))
1543                 goto out_iput;
1544
1545         if (ino.logicalBlockNum >= UDF_SB_PARTLEN(sb, ino.partitionReferenceNum)) {
1546                 udf_debug("block=%d, partition=%d out of range\n",
1547                         ino.logicalBlockNum, ino.partitionReferenceNum);
1548                 make_bad_inode(inode);
1549                 goto out_iput;
1550         }
1551
1552         return inode;
1553
1554  out_iput:
1555         iput(inode);
1556         return NULL;
1557 }
1558
1559 int8_t udf_add_aext(struct inode *inode, kernel_lb_addr *bloc, int *extoffset,
1560         kernel_lb_addr eloc, uint32_t elen, struct buffer_head **bh, int inc)
1561 {
1562         int adsize;
1563         short_ad *sad = NULL;
1564         long_ad *lad = NULL;
1565         struct allocExtDesc *aed;
1566         int8_t etype;
1567         uint8_t *ptr;
1568
1569         if (!*bh)
1570                 ptr = UDF_I_DATA(inode) + *extoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1571         else
1572                 ptr = (*bh)->b_data + *extoffset;
1573
1574         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1575                 adsize = sizeof(short_ad);
1576         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1577                 adsize = sizeof(long_ad);
1578         else
1579                 return -1;
1580
1581         if (*extoffset + (2 * adsize) > inode->i_sb->s_blocksize)
1582         {
1583                 char *sptr, *dptr;
1584                 struct buffer_head *nbh;
1585                 int err, loffset;
1586                 kernel_lb_addr obloc = *bloc;
1587
1588                 if (!(bloc->logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1589                         obloc.partitionReferenceNum, obloc.logicalBlockNum, &err)))
1590                 {
1591                         return -1;
1592                 }
1593                 if (!(nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1594                         *bloc, 0))))
1595                 {
1596                         return -1;
1597                 }
1598                 lock_buffer(nbh);
1599                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1600                 set_buffer_uptodate(nbh);
1601                 unlock_buffer(nbh);
1602                 mark_buffer_dirty_inode(nbh, inode);
1603
1604                 aed = (struct allocExtDesc *)(nbh->b_data);
1605                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1606                         aed->previousAllocExtLocation = cpu_to_le32(obloc.logicalBlockNum);
1607                 if (*extoffset + adsize > inode->i_sb->s_blocksize)
1608                 {
1609                         loffset = *extoffset;
1610                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1611                         sptr = ptr - adsize;
1612                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1613                         memcpy(dptr, sptr, adsize);
1614                         *extoffset = sizeof(struct allocExtDesc) + adsize;
1615                 }
1616                 else
1617                 {
1618                         loffset = *extoffset + adsize;
1619                         aed->lengthAllocDescs = cpu_to_le32(0);
1620                         sptr = ptr;
1621                         *extoffset = sizeof(struct allocExtDesc);
1622
1623                         if (*bh)
1624                         {
1625                                 aed = (struct allocExtDesc *)(*bh)->b_data;
1626                                 aed->lengthAllocDescs =
1627                                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1628                         }
1629                         else
1630                         {
1631                                 UDF_I_LENALLOC(inode) += adsize;
1632                                 mark_inode_dirty(inode);
1633                         }
1634                 }
1635                 if (UDF_SB_UDFREV(inode->i_sb) >= 0x0200)
1636                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1637                                 bloc->logicalBlockNum, sizeof(tag));
1638                 else
1639                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1640                                 bloc->logicalBlockNum, sizeof(tag));
1641                 switch (UDF_I_ALLOCTYPE(inode))
1642                 {
1643                         case ICBTAG_FLAG_AD_SHORT:
1644                         {
1645                                 sad = (short_ad *)sptr;
1646                                 sad->extLength = cpu_to_le32(
1647                                         EXT_NEXT_EXTENT_ALLOCDECS |
1648                                         inode->i_sb->s_blocksize);
1649                                 sad->extPosition = cpu_to_le32(bloc->logicalBlockNum);
1650                                 break;
1651                         }
1652                         case ICBTAG_FLAG_AD_LONG:
1653                         {
1654                                 lad = (long_ad *)sptr;
1655                                 lad->extLength = cpu_to_le32(
1656                                         EXT_NEXT_EXTENT_ALLOCDECS |
1657                                         inode->i_sb->s_blocksize);
1658                                 lad->extLocation = cpu_to_lelb(*bloc);
1659                                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1660                                 break;
1661                         }
1662                 }
1663                 if (*bh)
1664                 {
1665                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1666                                 udf_update_tag((*bh)->b_data, loffset);
1667                         else
1668                                 udf_update_tag((*bh)->b_data, sizeof(struct allocExtDesc));
1669                         mark_buffer_dirty_inode(*bh, inode);
1670                         udf_release_data(*bh);
1671                 }
1672                 else
1673                         mark_inode_dirty(inode);
1674                 *bh = nbh;
1675         }
1676
1677         etype = udf_write_aext(inode, *bloc, extoffset, eloc, elen, *bh, inc);
1678
1679         if (!*bh)
1680         {
1681                 UDF_I_LENALLOC(inode) += adsize;
1682                 mark_inode_dirty(inode);
1683         }
1684         else
1685         {
1686                 aed = (struct allocExtDesc *)(*bh)->b_data;
1687                 aed->lengthAllocDescs =
1688                         cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) + adsize);
1689                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1690                         udf_update_tag((*bh)->b_data, *extoffset + (inc ? 0 : adsize));
1691                 else
1692                         udf_update_tag((*bh)->b_data, sizeof(struct allocExtDesc));
1693                 mark_buffer_dirty_inode(*bh, inode);
1694         }
1695
1696         return etype;
1697 }
1698
1699 int8_t udf_write_aext(struct inode *inode, kernel_lb_addr bloc, int *extoffset,
1700     kernel_lb_addr eloc, uint32_t elen, struct buffer_head *bh, int inc)
1701 {
1702         int adsize;
1703         uint8_t *ptr;
1704
1705         if (!bh)
1706                 ptr = UDF_I_DATA(inode) + *extoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1707         else
1708         {
1709                 ptr = bh->b_data + *extoffset;
1710                 atomic_inc(&bh->b_count);
1711         }
1712
1713         switch (UDF_I_ALLOCTYPE(inode))
1714         {
1715                 case ICBTAG_FLAG_AD_SHORT:
1716                 {
1717                         short_ad *sad = (short_ad *)ptr;
1718                         sad->extLength = cpu_to_le32(elen);
1719                         sad->extPosition = cpu_to_le32(eloc.logicalBlockNum);
1720                         adsize = sizeof(short_ad);
1721                         break;
1722                 }
1723                 case ICBTAG_FLAG_AD_LONG:
1724                 {
1725                         long_ad *lad = (long_ad *)ptr;
1726                         lad->extLength = cpu_to_le32(elen);
1727                         lad->extLocation = cpu_to_lelb(eloc);
1728                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1729                         adsize = sizeof(long_ad);
1730                         break;
1731                 }
1732                 default:
1733                         return -1;
1734         }
1735
1736         if (bh)
1737         {
1738                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1739                 {
1740                         struct allocExtDesc *aed = (struct allocExtDesc *)(bh)->b_data;
1741                         udf_update_tag((bh)->b_data,
1742                                 le32_to_cpu(aed->lengthAllocDescs) + sizeof(struct allocExtDesc));
1743                 }
1744                 mark_buffer_dirty_inode(bh, inode);
1745                 udf_release_data(bh);
1746         }
1747         else
1748                 mark_inode_dirty(inode);
1749
1750         if (inc)
1751                 *extoffset += adsize;
1752         return (elen >> 30);
1753 }
1754
1755 int8_t udf_next_aext(struct inode *inode, kernel_lb_addr *bloc, int *extoffset,
1756         kernel_lb_addr *eloc, uint32_t *elen, struct buffer_head **bh, int inc)
1757 {
1758         int8_t etype;
1759
1760         while ((etype = udf_current_aext(inode, bloc, extoffset, eloc, elen, bh, inc)) ==
1761                 (EXT_NEXT_EXTENT_ALLOCDECS >> 30))
1762         {
1763                 *bloc = *eloc;
1764                 *extoffset = sizeof(struct allocExtDesc);
1765                 udf_release_data(*bh);
1766                 if (!(*bh = udf_tread(inode->i_sb, udf_get_lb_pblock(inode->i_sb, *bloc, 0))))
1767                 {
1768                         udf_debug("reading block %d failed!\n",
1769                                 udf_get_lb_pblock(inode->i_sb, *bloc, 0));
1770                         return -1;
1771                 }
1772         }
1773
1774         return etype;
1775 }
1776
1777 int8_t udf_current_aext(struct inode *inode, kernel_lb_addr *bloc, int *extoffset,
1778         kernel_lb_addr *eloc, uint32_t *elen, struct buffer_head **bh, int inc)
1779 {
1780         int alen;
1781         int8_t etype;
1782         uint8_t *ptr;
1783
1784         if (!*bh)
1785         {
1786                 if (!(*extoffset))
1787                         *extoffset = udf_file_entry_alloc_offset(inode);
1788                 ptr = UDF_I_DATA(inode) + *extoffset - udf_file_entry_alloc_offset(inode) + UDF_I_LENEATTR(inode);
1789                 alen = udf_file_entry_alloc_offset(inode) + UDF_I_LENALLOC(inode);
1790         }
1791         else
1792         {
1793                 if (!(*extoffset))
1794                         *extoffset = sizeof(struct allocExtDesc);
1795                 ptr = (*bh)->b_data + *extoffset;
1796                 alen = sizeof(struct allocExtDesc) + le32_to_cpu(((struct allocExtDesc *)(*bh)->b_data)->lengthAllocDescs);
1797         }
1798
1799         switch (UDF_I_ALLOCTYPE(inode))
1800         {
1801                 case ICBTAG_FLAG_AD_SHORT:
1802                 {
1803                         short_ad *sad;
1804
1805                         if (!(sad = udf_get_fileshortad(ptr, alen, extoffset, inc)))
1806                                 return -1;
1807
1808                         etype = le32_to_cpu(sad->extLength) >> 30;
1809                         eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1810                         eloc->partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
1811                         *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1812                         break;
1813                 }
1814                 case ICBTAG_FLAG_AD_LONG:
1815                 {
1816                         long_ad *lad;
1817
1818                         if (!(lad = udf_get_filelongad(ptr, alen, extoffset, inc)))
1819                                 return -1;
1820
1821                         etype = le32_to_cpu(lad->extLength) >> 30;
1822                         *eloc = lelb_to_cpu(lad->extLocation);
1823                         *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1824                         break;
1825                 }
1826                 default:
1827                 {
1828                         udf_debug("alloc_type = %d unsupported\n", UDF_I_ALLOCTYPE(inode));
1829                         return -1;
1830                 }
1831         }
1832
1833         return etype;
1834 }
1835
1836 static int8_t
1837 udf_insert_aext(struct inode *inode, kernel_lb_addr bloc, int extoffset,
1838                 kernel_lb_addr neloc, uint32_t nelen, struct buffer_head *bh)
1839 {
1840         kernel_lb_addr oeloc;
1841         uint32_t oelen;
1842         int8_t etype;
1843
1844         if (bh)
1845                 atomic_inc(&bh->b_count);
1846
1847         while ((etype = udf_next_aext(inode, &bloc, &extoffset, &oeloc, &oelen, &bh, 0)) != -1)
1848         {
1849                 udf_write_aext(inode, bloc, &extoffset, neloc, nelen, bh, 1);
1850
1851                 neloc = oeloc;
1852                 nelen = (etype << 30) | oelen;
1853         }
1854         udf_add_aext(inode, &bloc, &extoffset, neloc, nelen, &bh, 1);
1855         udf_release_data(bh);
1856         return (nelen >> 30);
1857 }
1858
1859 int8_t udf_delete_aext(struct inode *inode, kernel_lb_addr nbloc, int nextoffset,
1860         kernel_lb_addr eloc, uint32_t elen, struct buffer_head *nbh)
1861 {
1862         struct buffer_head *obh;
1863         kernel_lb_addr obloc;
1864         int oextoffset, adsize;
1865         int8_t etype;
1866         struct allocExtDesc *aed;
1867
1868         if (nbh)
1869         {
1870                 atomic_inc(&nbh->b_count);
1871                 atomic_inc(&nbh->b_count);
1872         }
1873
1874         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
1875                 adsize = sizeof(short_ad);
1876         else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
1877                 adsize = sizeof(long_ad);
1878         else
1879                 adsize = 0;
1880
1881         obh = nbh;
1882         obloc = nbloc;
1883         oextoffset = nextoffset;
1884
1885         if (udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1) == -1)
1886                 return -1;
1887
1888         while ((etype = udf_next_aext(inode, &nbloc, &nextoffset, &eloc, &elen, &nbh, 1)) != -1)
1889         {
1890                 udf_write_aext(inode, obloc, &oextoffset, eloc, (etype << 30) | elen, obh, 1);
1891                 if (obh != nbh)
1892                 {
1893                         obloc = nbloc;
1894                         udf_release_data(obh);
1895                         atomic_inc(&nbh->b_count);
1896                         obh = nbh;
1897                         oextoffset = nextoffset - adsize;
1898                 }
1899         }
1900         memset(&eloc, 0x00, sizeof(kernel_lb_addr));
1901         elen = 0;
1902
1903         if (nbh != obh)
1904         {
1905                 udf_free_blocks(inode->i_sb, inode, nbloc, 0, 1);
1906                 udf_write_aext(inode, obloc, &oextoffset, eloc, elen, obh, 1);
1907                 udf_write_aext(inode, obloc, &oextoffset, eloc, elen, obh, 1);
1908                 if (!obh)
1909                 {
1910                         UDF_I_LENALLOC(inode) -= (adsize * 2);
1911                         mark_inode_dirty(inode);
1912                 }
1913                 else
1914                 {
1915                         aed = (struct allocExtDesc *)(obh)->b_data;
1916                         aed->lengthAllocDescs =
1917                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - (2*adsize));
1918                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1919                                 udf_update_tag((obh)->b_data, oextoffset - (2*adsize));
1920                         else
1921                                 udf_update_tag((obh)->b_data, sizeof(struct allocExtDesc));
1922                         mark_buffer_dirty_inode(obh, inode);
1923                 }
1924         }
1925         else
1926         {
1927                 udf_write_aext(inode, obloc, &oextoffset, eloc, elen, obh, 1);
1928                 if (!obh)
1929                 {
1930                         UDF_I_LENALLOC(inode) -= adsize;
1931                         mark_inode_dirty(inode);
1932                 }
1933                 else
1934                 {
1935                         aed = (struct allocExtDesc *)(obh)->b_data;
1936                         aed->lengthAllocDescs =
1937                                 cpu_to_le32(le32_to_cpu(aed->lengthAllocDescs) - adsize);
1938                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
1939                                 udf_update_tag((obh)->b_data, oextoffset - adsize);
1940                         else
1941                                 udf_update_tag((obh)->b_data, sizeof(struct allocExtDesc));
1942                         mark_buffer_dirty_inode(obh, inode);
1943                 }
1944         }
1945
1946         udf_release_data(nbh);
1947         udf_release_data(obh);
1948         return (elen >> 30);
1949 }
1950
1951 int8_t inode_bmap(struct inode *inode, int block, kernel_lb_addr *bloc, uint32_t *extoffset,
1952         kernel_lb_addr *eloc, uint32_t *elen, uint32_t *offset, struct buffer_head **bh)
1953 {
1954         uint64_t lbcount = 0, bcount = (uint64_t)block << inode->i_sb->s_blocksize_bits;
1955         int8_t etype;
1956
1957         if (block < 0)
1958         {
1959                 printk(KERN_ERR "udf: inode_bmap: block < 0\n");
1960                 return -1;
1961         }
1962
1963         *extoffset = 0;
1964         *elen = 0;
1965         *bloc = UDF_I_LOCATION(inode);
1966
1967         do
1968         {
1969                 if ((etype = udf_next_aext(inode, bloc, extoffset, eloc, elen, bh, 1)) == -1)
1970                 {
1971                         *offset = bcount - lbcount;
1972                         UDF_I_LENEXTENTS(inode) = lbcount;
1973                         return -1;
1974                 }
1975                 lbcount += *elen;
1976         } while (lbcount <= bcount);
1977
1978         *offset = bcount + *elen - lbcount;
1979
1980         return etype;
1981 }
1982
1983 long udf_block_map(struct inode *inode, long block)
1984 {
1985         kernel_lb_addr eloc, bloc;
1986         uint32_t offset, extoffset, elen;
1987         struct buffer_head *bh = NULL;
1988         int ret;
1989
1990         lock_kernel();
1991
1992         if (inode_bmap(inode, block, &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
1993                 ret = udf_get_lb_pblock(inode->i_sb, eloc, offset >> inode->i_sb->s_blocksize_bits);
1994         else
1995                 ret = 0;
1996
1997         unlock_kernel();
1998         udf_release_data(bh);
1999
2000         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2001                 return udf_fixed_to_variable(ret);
2002         else
2003                 return ret;
2004 }