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_sync_inode(struct inode *inode);
  55 static int udf_alloc_i_data(struct inode *inode, size_t size);
  56 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  57                                         sector_t *, int *);
  58 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  59                               struct kernel_lb_addr, uint32_t);
  60 static void udf_split_extents(struct inode *, int *, int, int,
  61                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  62 static void udf_prealloc_extents(struct inode *, int, int,
  63                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  64 static void udf_merge_extents(struct inode *,
  65                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  66 static void udf_update_extents(struct inode *,
  67                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  68                                struct extent_position *);
  69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  70
  71
  72 void udf_evict_inode(struct inode *inode)
  73 {
  74         struct udf_inode_info *iinfo = UDF_I(inode);
  75         int want_delete = 0;
  76
  77         truncate_inode_pages(&inode->i_data, 0);
  78
  79         if (!inode->i_nlink && !is_bad_inode(inode)) {
  80                 want_delete = 1;
  81                 inode->i_size = 0;
  82                 udf_truncate(inode);
  83                 udf_update_inode(inode, IS_SYNC(inode));
  84         }
  85         invalidate_inode_buffers(inode);
  86         end_writeback(inode);
  87         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
  88             inode->i_size != iinfo->i_lenExtents) {
  89                 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
  90                         "inode size %llu different from extent length %llu. "
  91                         "Filesystem need not be standards compliant.\n",
  92                         inode->i_sb->s_id, inode->i_ino, inode->i_mode,
  93                         (unsigned long long)inode->i_size,
  94                         (unsigned long long)iinfo->i_lenExtents);
  95         }
  96         kfree(iinfo->i_ext.i_data);
  97         iinfo->i_ext.i_data = NULL;
  98         if (want_delete) {
  99                 lock_kernel();
 100                 udf_free_inode(inode);
 101                 unlock_kernel();
 102         }
 103 }
 104
 105 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 106 {
 107         return block_write_full_page(page, udf_get_block, wbc);
 108 }
 109
 110 static int udf_readpage(struct file *file, struct page *page)
 111 {
 112         return block_read_full_page(page, udf_get_block);
 113 }
 114
 115 static int udf_write_begin(struct file *file, struct address_space *mapping,
 116                         loff_t pos, unsigned len, unsigned flags,
 117                         struct page **pagep, void **fsdata)
 118 {
 119         int ret;
 120
 121         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 122         if (unlikely(ret)) {
 123                 loff_t isize = mapping->host->i_size;
 124                 if (pos + len > isize)
 125                         vmtruncate(mapping->host, isize);
 126         }
 127
 128         return ret;
 129 }
 130
 131 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 132 {
 133         return generic_block_bmap(mapping, block, udf_get_block);
 134 }
 135
 136 const struct address_space_operations udf_aops = {
 137         .readpage       = udf_readpage,
 138         .writepage      = udf_writepage,
 139         .sync_page      = block_sync_page,
 140         .write_begin            = udf_write_begin,
 141         .write_end              = generic_write_end,
 142         .bmap           = udf_bmap,
 143 };
 144
 145 void udf_expand_file_adinicb(struct inode *inode, int newsize, int *err)
 146 {
 147         struct page *page;
 148         char *kaddr;
 149         struct udf_inode_info *iinfo = UDF_I(inode);
 150         struct writeback_control udf_wbc = {
 151                 .sync_mode = WB_SYNC_NONE,
 152                 .nr_to_write = 1,
 153         };
 154
 155         /* from now on we have normal address_space methods */
 156         inode->i_data.a_ops = &udf_aops;
 157
 158         if (!iinfo->i_lenAlloc) {
 159                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 160                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 161                 else
 162                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 163                 mark_inode_dirty(inode);
 164                 return;
 165         }
 166
 167         page = grab_cache_page(inode->i_mapping, 0);
 168         BUG_ON(!PageLocked(page));
 169
 170         if (!PageUptodate(page)) {
 171                 kaddr = kmap(page);
 172                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 173                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 174                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 175                         iinfo->i_lenAlloc);
 176                 flush_dcache_page(page);
 177                 SetPageUptodate(page);
 178                 kunmap(page);
 179         }
 180         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 181                iinfo->i_lenAlloc);
 182         iinfo->i_lenAlloc = 0;
 183         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 184                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 185         else
 186                 iinfo->i_alloc_type = 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,
 195                                            int *err)
 196 {
 197         int newblock;
 198         struct buffer_head *dbh = NULL;
 199         struct kernel_lb_addr eloc;
 200         uint8_t alloctype;
 201         struct extent_position epos;
 202
 203         struct udf_fileident_bh sfibh, dfibh;
 204         loff_t f_pos = udf_ext0_offset(inode);
 205         int size = udf_ext0_offset(inode) + inode->i_size;
 206         struct fileIdentDesc cfi, *sfi, *dfi;
 207         struct udf_inode_info *iinfo = UDF_I(inode);
 208
 209         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 210                 alloctype = ICBTAG_FLAG_AD_SHORT;
 211         else
 212                 alloctype = ICBTAG_FLAG_AD_LONG;
 213
 214         if (!inode->i_size) {
 215                 iinfo->i_alloc_type = alloctype;
 216                 mark_inode_dirty(inode);
 217                 return NULL;
 218         }
 219
 220         /* alloc block, and copy data to it */
 221         *block = udf_new_block(inode->i_sb, inode,
 222                                iinfo->i_location.partitionReferenceNum,
 223                                iinfo->i_location.logicalBlockNum, err);
 224         if (!(*block))
 225                 return NULL;
 226         newblock = udf_get_pblock(inode->i_sb, *block,
 227                                   iinfo->i_location.partitionReferenceNum,
 228                                 0);
 229         if (!newblock)
 230                 return NULL;
 231         dbh = udf_tgetblk(inode->i_sb, newblock);
 232         if (!dbh)
 233                 return NULL;
 234         lock_buffer(dbh);
 235         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 236         set_buffer_uptodate(dbh);
 237         unlock_buffer(dbh);
 238         mark_buffer_dirty_inode(dbh, inode);
 239
 240         sfibh.soffset = sfibh.eoffset =
 241                         f_pos & (inode->i_sb->s_blocksize - 1);
 242         sfibh.sbh = sfibh.ebh = NULL;
 243         dfibh.soffset = dfibh.eoffset = 0;
 244         dfibh.sbh = dfibh.ebh = dbh;
 245         while (f_pos < size) {
 246                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 247                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 248                                          NULL, NULL, NULL);
 249                 if (!sfi) {
 250                         brelse(dbh);
 251                         return NULL;
 252                 }
 253                 iinfo->i_alloc_type = alloctype;
 254                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 255                 dfibh.soffset = dfibh.eoffset;
 256                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 257                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 258                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 259                                  sfi->fileIdent +
 260                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 261                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 262                         brelse(dbh);
 263                         return NULL;
 264                 }
 265         }
 266         mark_buffer_dirty_inode(dbh, inode);
 267
 268         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 269                 iinfo->i_lenAlloc);
 270         iinfo->i_lenAlloc = 0;
 271         eloc.logicalBlockNum = *block;
 272         eloc.partitionReferenceNum =
 273                                 iinfo->i_location.partitionReferenceNum;
 274         iinfo->i_lenExtents = inode->i_size;
 275         epos.bh = NULL;
 276         epos.block = iinfo->i_location;
 277         epos.offset = udf_file_entry_alloc_offset(inode);
 278         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 279         /* UniqueID stuff */
 280
 281         brelse(epos.bh);
 282         mark_inode_dirty(inode);
 283         return dbh;
 284 }
 285
 286 static int udf_get_block(struct inode *inode, sector_t block,
 287                          struct buffer_head *bh_result, int create)
 288 {
 289         int err, new;
 290         struct buffer_head *bh;
 291         sector_t phys = 0;
 292         struct udf_inode_info *iinfo;
 293
 294         if (!create) {
 295                 phys = udf_block_map(inode, block);
 296                 if (phys)
 297                         map_bh(bh_result, inode->i_sb, phys);
 298                 return 0;
 299         }
 300
 301         err = -EIO;
 302         new = 0;
 303         bh = NULL;
 304         iinfo = UDF_I(inode);
 305
 306         down_write(&iinfo->i_data_sem);
 307         if (block == iinfo->i_next_alloc_block + 1) {
 308                 iinfo->i_next_alloc_block++;
 309                 iinfo->i_next_alloc_goal++;
 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
 324 abort:
 325         up_write(&iinfo->i_data_sem);
 326         return err;
 327 }
 328
 329 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 330                                       int create, int *err)
 331 {
 332         struct buffer_head *bh;
 333         struct buffer_head dummy;
 334
 335         dummy.b_state = 0;
 336         dummy.b_blocknr = -1000;
 337         *err = udf_get_block(inode, block, &dummy, create);
 338         if (!*err && buffer_mapped(&dummy)) {
 339                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 340                 if (buffer_new(&dummy)) {
 341                         lock_buffer(bh);
 342                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 343                         set_buffer_uptodate(bh);
 344                         unlock_buffer(bh);
 345                         mark_buffer_dirty_inode(bh, inode);
 346                 }
 347                 return bh;
 348         }
 349
 350         return NULL;
 351 }
 352
 353 /* Extend the file by 'blocks' blocks, return the number of extents added */
 354 int udf_extend_file(struct inode *inode, struct extent_position *last_pos,
 355                     struct kernel_long_ad *last_ext, sector_t blocks)
 356 {
 357         sector_t add;
 358         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 359         struct super_block *sb = inode->i_sb;
 360         struct kernel_lb_addr prealloc_loc = {};
 361         int prealloc_len = 0;
 362         struct udf_inode_info *iinfo;
 363
 364         /* The previous extent is fake and we should not extend by anything
 365          * - there's nothing to do... */
 366         if (!blocks && fake)
 367                 return 0;
 368
 369         iinfo = UDF_I(inode);
 370         /* Round the last extent up to a multiple of block size */
 371         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 372                 last_ext->extLength =
 373                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 374                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 375                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 376                 iinfo->i_lenExtents =
 377                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 378                         ~(sb->s_blocksize - 1);
 379         }
 380
 381         /* Last extent are just preallocated blocks? */
 382         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 383                                                 EXT_NOT_RECORDED_ALLOCATED) {
 384                 /* Save the extent so that we can reattach it to the end */
 385                 prealloc_loc = last_ext->extLocation;
 386                 prealloc_len = last_ext->extLength;
 387                 /* Mark the extent as a hole */
 388                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 389                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 390                 last_ext->extLocation.logicalBlockNum = 0;
 391                 last_ext->extLocation.partitionReferenceNum = 0;
 392         }
 393
 394         /* Can we merge with the previous extent? */
 395         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 396                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 397                 add = ((1 << 30) - sb->s_blocksize -
 398                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 399                         sb->s_blocksize_bits;
 400                 if (add > blocks)
 401                         add = blocks;
 402                 blocks -= add;
 403                 last_ext->extLength += add << sb->s_blocksize_bits;
 404         }
 405
 406         if (fake) {
 407                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 408                              last_ext->extLength, 1);
 409                 count++;
 410         } else
 411                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 412                                 last_ext->extLength, 1);
 413
 414         /* Managed to do everything necessary? */
 415         if (!blocks)
 416                 goto out;
 417
 418         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 419         last_ext->extLocation.logicalBlockNum = 0;
 420         last_ext->extLocation.partitionReferenceNum = 0;
 421         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 422         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 423                                 (add << sb->s_blocksize_bits);
 424
 425         /* Create enough extents to cover the whole hole */
 426         while (blocks > add) {
 427                 blocks -= add;
 428                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
 429                                  last_ext->extLength, 1) == -1)
 430                         return -1;
 431                 count++;
 432         }
 433         if (blocks) {
 434                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 435                         (blocks << sb->s_blocksize_bits);
 436                 if (udf_add_aext(inode, last_pos, &last_ext->extLocation,
 437                                  last_ext->extLength, 1) == -1)
 438                         return -1;
 439                 count++;
 440         }
 441
 442 out:
 443         /* Do we have some preallocated blocks saved? */
 444         if (prealloc_len) {
 445                 if (udf_add_aext(inode, last_pos, &prealloc_loc,
 446                                  prealloc_len, 1) == -1)
 447                         return -1;
 448                 last_ext->extLocation = prealloc_loc;
 449                 last_ext->extLength = prealloc_len;
 450                 count++;
 451         }
 452
 453         /* last_pos should point to the last written extent... */
 454         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 455                 last_pos->offset -= sizeof(struct short_ad);
 456         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 457                 last_pos->offset -= sizeof(struct long_ad);
 458         else
 459                 return -1;
 460
 461         return count;
 462 }
 463
 464 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 465                                         int *err, sector_t *phys, int *new)
 466 {
 467         static sector_t last_block;
 468         struct buffer_head *result = NULL;
 469         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 470         struct extent_position prev_epos, cur_epos, next_epos;
 471         int count = 0, startnum = 0, endnum = 0;
 472         uint32_t elen = 0, tmpelen;
 473         struct kernel_lb_addr eloc, tmpeloc;
 474         int c = 1;
 475         loff_t lbcount = 0, b_off = 0;
 476         uint32_t newblocknum, newblock;
 477         sector_t offset = 0;
 478         int8_t etype;
 479         struct udf_inode_info *iinfo = UDF_I(inode);
 480         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 481         int lastblock = 0;
 482
 483         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 484         prev_epos.block = iinfo->i_location;
 485         prev_epos.bh = NULL;
 486         cur_epos = next_epos = prev_epos;
 487         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 488
 489         /* find the extent which contains the block we are looking for.
 490            alternate between laarr[0] and laarr[1] for locations of the
 491            current extent, and the previous extent */
 492         do {
 493                 if (prev_epos.bh != cur_epos.bh) {
 494                         brelse(prev_epos.bh);
 495                         get_bh(cur_epos.bh);
 496                         prev_epos.bh = cur_epos.bh;
 497                 }
 498                 if (cur_epos.bh != next_epos.bh) {
 499                         brelse(cur_epos.bh);
 500                         get_bh(next_epos.bh);
 501                         cur_epos.bh = next_epos.bh;
 502                 }
 503
 504                 lbcount += elen;
 505
 506                 prev_epos.block = cur_epos.block;
 507                 cur_epos.block = next_epos.block;
 508
 509                 prev_epos.offset = cur_epos.offset;
 510                 cur_epos.offset = next_epos.offset;
 511
 512                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 513                 if (etype == -1)
 514                         break;
 515
 516                 c = !c;
 517
 518                 laarr[c].extLength = (etype << 30) | elen;
 519                 laarr[c].extLocation = eloc;
 520
 521                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 522                         pgoal = eloc.logicalBlockNum +
 523                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 524                                  inode->i_sb->s_blocksize_bits);
 525
 526                 count++;
 527         } while (lbcount + elen <= b_off);
 528
 529         b_off -= lbcount;
 530         offset = b_off >> inode->i_sb->s_blocksize_bits;
 531         /*
 532          * Move prev_epos and cur_epos into indirect extent if we are at
 533          * the pointer to it
 534          */
 535         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 536         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 537
 538         /* if the extent is allocated and recorded, return the block
 539            if the extent is not a multiple of the blocksize, round up */
 540
 541         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 542                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 543                         elen = EXT_RECORDED_ALLOCATED |
 544                                 ((elen + inode->i_sb->s_blocksize - 1) &
 545                                  ~(inode->i_sb->s_blocksize - 1));
 546                         etype = udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 547                 }
 548                 brelse(prev_epos.bh);
 549                 brelse(cur_epos.bh);
 550                 brelse(next_epos.bh);
 551                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 552                 *phys = newblock;
 553                 return NULL;
 554         }
 555
 556         last_block = block;
 557         /* Are we beyond EOF? */
 558         if (etype == -1) {
 559                 int ret;
 560
 561                 if (count) {
 562                         if (c)
 563                                 laarr[0] = laarr[1];
 564                         startnum = 1;
 565                 } else {
 566                         /* Create a fake extent when there's not one */
 567                         memset(&laarr[0].extLocation, 0x00,
 568                                 sizeof(struct kernel_lb_addr));
 569                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 570                         /* Will udf_extend_file() create real extent from
 571                            a fake one? */
 572                         startnum = (offset > 0);
 573                 }
 574                 /* Create extents for the hole between EOF and offset */
 575                 ret = udf_extend_file(inode, &prev_epos, laarr, offset);
 576                 if (ret == -1) {
 577                         brelse(prev_epos.bh);
 578                         brelse(cur_epos.bh);
 579                         brelse(next_epos.bh);
 580                         /* We don't really know the error here so we just make
 581                          * something up */
 582                         *err = -ENOSPC;
 583                         return NULL;
 584                 }
 585                 c = 0;
 586                 offset = 0;
 587                 count += ret;
 588                 /* We are not covered by a preallocated extent? */
 589                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 590                                                 EXT_NOT_RECORDED_ALLOCATED) {
 591                         /* Is there any real extent? - otherwise we overwrite
 592                          * the fake one... */
 593                         if (count)
 594                                 c = !c;
 595                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 596                                 inode->i_sb->s_blocksize;
 597                         memset(&laarr[c].extLocation, 0x00,
 598                                 sizeof(struct kernel_lb_addr));
 599                         count++;
 600                         endnum++;
 601                 }
 602                 endnum = c + 1;
 603                 lastblock = 1;
 604         } else {
 605                 endnum = startnum = ((count > 2) ? 2 : count);
 606
 607                 /* if the current extent is in position 0,
 608                    swap it with the previous */
 609                 if (!c && count != 1) {
 610                         laarr[2] = laarr[0];
 611                         laarr[0] = laarr[1];
 612                         laarr[1] = laarr[2];
 613                         c = 1;
 614                 }
 615
 616                 /* if the current block is located in an extent,
 617                    read the next extent */
 618                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 619                 if (etype != -1) {
 620                         laarr[c + 1].extLength = (etype << 30) | elen;
 621                         laarr[c + 1].extLocation = eloc;
 622                         count++;
 623                         startnum++;
 624                         endnum++;
 625                 } else
 626                         lastblock = 1;
 627         }
 628
 629         /* if the current extent is not recorded but allocated, get the
 630          * block in the extent corresponding to the requested block */
 631         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 632                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 633         else { /* otherwise, allocate a new block */
 634                 if (iinfo->i_next_alloc_block == block)
 635                         goal = iinfo->i_next_alloc_goal;
 636
 637                 if (!goal) {
 638                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 639                                 goal = iinfo->i_location.logicalBlockNum + 1;
 640                 }
 641
 642                 newblocknum = udf_new_block(inode->i_sb, inode,
 643                                 iinfo->i_location.partitionReferenceNum,
 644                                 goal, err);
 645                 if (!newblocknum) {
 646                         brelse(prev_epos.bh);
 647                         *err = -ENOSPC;
 648                         return NULL;
 649                 }
 650                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 651         }
 652
 653         /* if the extent the requsted block is located in contains multiple
 654          * blocks, split the extent into at most three extents. blocks prior
 655          * to requested block, requested block, and blocks after requested
 656          * block */
 657         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 658
 659 #ifdef UDF_PREALLOCATE
 660         /* We preallocate blocks only for regular files. It also makes sense
 661          * for directories but there's a problem when to drop the
 662          * preallocation. We might use some delayed work for that but I feel
 663          * it's overengineering for a filesystem like UDF. */
 664         if (S_ISREG(inode->i_mode))
 665                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 666 #endif
 667
 668         /* merge any continuous blocks in laarr */
 669         udf_merge_extents(inode, laarr, &endnum);
 670
 671         /* write back the new extents, inserting new extents if the new number
 672          * of extents is greater than the old number, and deleting extents if
 673          * the new number of extents is less than the old number */
 674         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 675
 676         brelse(prev_epos.bh);
 677
 678         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 679                                 iinfo->i_location.partitionReferenceNum, 0);
 680         if (!newblock)
 681                 return NULL;
 682         *phys = newblock;
 683         *err = 0;
 684         *new = 1;
 685         iinfo->i_next_alloc_block = block;
 686         iinfo->i_next_alloc_goal = newblocknum;
 687         inode->i_ctime = current_fs_time(inode->i_sb);
 688
 689         if (IS_SYNC(inode))
 690                 udf_sync_inode(inode);
 691         else
 692                 mark_inode_dirty(inode);
 693
 694         return result;
 695 }
 696
 697 static void udf_split_extents(struct inode *inode, int *c, int offset,
 698                               int newblocknum,
 699                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 700                               int *endnum)
 701 {
 702         unsigned long blocksize = inode->i_sb->s_blocksize;
 703         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 704
 705         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 706             (laarr[*c].extLength >> 30) ==
 707                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 708                 int curr = *c;
 709                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 710                             blocksize - 1) >> blocksize_bits;
 711                 int8_t etype = (laarr[curr].extLength >> 30);
 712
 713                 if (blen == 1)
 714                         ;
 715                 else if (!offset || blen == offset + 1) {
 716                         laarr[curr + 2] = laarr[curr + 1];
 717                         laarr[curr + 1] = laarr[curr];
 718                 } else {
 719                         laarr[curr + 3] = laarr[curr + 1];
 720                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 721                 }
 722
 723                 if (offset) {
 724                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 725                                 udf_free_blocks(inode->i_sb, inode,
 726                                                 &laarr[curr].extLocation,
 727                                                 0, offset);
 728                                 laarr[curr].extLength =
 729                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 730                                         (offset << blocksize_bits);
 731                                 laarr[curr].extLocation.logicalBlockNum = 0;
 732                                 laarr[curr].extLocation.
 733                                                 partitionReferenceNum = 0;
 734                         } else
 735                                 laarr[curr].extLength = (etype << 30) |
 736                                         (offset << blocksize_bits);
 737                         curr++;
 738                         (*c)++;
 739                         (*endnum)++;
 740                 }
 741
 742                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 743                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 744                         laarr[curr].extLocation.partitionReferenceNum =
 745                                 UDF_I(inode)->i_location.partitionReferenceNum;
 746                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 747                         blocksize;
 748                 curr++;
 749
 750                 if (blen != offset + 1) {
 751                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 752                                 laarr[curr].extLocation.logicalBlockNum +=
 753                                                                 offset + 1;
 754                         laarr[curr].extLength = (etype << 30) |
 755                                 ((blen - (offset + 1)) << blocksize_bits);
 756                         curr++;
 757                         (*endnum)++;
 758                 }
 759         }
 760 }
 761
 762 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 763                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 764                                  int *endnum)
 765 {
 766         int start, length = 0, currlength = 0, i;
 767
 768         if (*endnum >= (c + 1)) {
 769                 if (!lastblock)
 770                         return;
 771                 else
 772                         start = c;
 773         } else {
 774                 if ((laarr[c + 1].extLength >> 30) ==
 775                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 776                         start = c + 1;
 777                         length = currlength =
 778                                 (((laarr[c + 1].extLength &
 779                                         UDF_EXTENT_LENGTH_MASK) +
 780                                 inode->i_sb->s_blocksize - 1) >>
 781                                 inode->i_sb->s_blocksize_bits);
 782                 } else
 783                         start = c;
 784         }
 785
 786         for (i = start + 1; i <= *endnum; i++) {
 787                 if (i == *endnum) {
 788                         if (lastblock)
 789                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 790                 } else if ((laarr[i].extLength >> 30) ==
 791                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 792                         length += (((laarr[i].extLength &
 793                                                 UDF_EXTENT_LENGTH_MASK) +
 794                                     inode->i_sb->s_blocksize - 1) >>
 795                                     inode->i_sb->s_blocksize_bits);
 796                 } else
 797                         break;
 798         }
 799
 800         if (length) {
 801                 int next = laarr[start].extLocation.logicalBlockNum +
 802                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 803                           inode->i_sb->s_blocksize - 1) >>
 804                           inode->i_sb->s_blocksize_bits);
 805                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 806                                 laarr[start].extLocation.partitionReferenceNum,
 807                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 808                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 809                                 currlength);
 810                 if (numalloc)   {
 811                         if (start == (c + 1))
 812                                 laarr[start].extLength +=
 813                                         (numalloc <<
 814                                          inode->i_sb->s_blocksize_bits);
 815                         else {
 816                                 memmove(&laarr[c + 2], &laarr[c + 1],
 817                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 818                                 (*endnum)++;
 819                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 820                                 laarr[c + 1].extLocation.partitionReferenceNum =
 821                                         laarr[c].extLocation.
 822                                                         partitionReferenceNum;
 823                                 laarr[c + 1].extLength =
 824                                         EXT_NOT_RECORDED_ALLOCATED |
 825                                         (numalloc <<
 826                                          inode->i_sb->s_blocksize_bits);
 827                                 start = c + 1;
 828                         }
 829
 830                         for (i = start + 1; numalloc && i < *endnum; i++) {
 831                                 int elen = ((laarr[i].extLength &
 832                                                 UDF_EXTENT_LENGTH_MASK) +
 833                                             inode->i_sb->s_blocksize - 1) >>
 834                                             inode->i_sb->s_blocksize_bits;
 835
 836                                 if (elen > numalloc) {
 837                                         laarr[i].extLength -=
 838                                                 (numalloc <<
 839                                                  inode->i_sb->s_blocksize_bits);
 840                                         numalloc = 0;
 841                                 } else {
 842                                         numalloc -= elen;
 843                                         if (*endnum > (i + 1))
 844                                                 memmove(&laarr[i],
 845                                                         &laarr[i + 1],
 846                                                         sizeof(struct long_ad) *
 847                                                         (*endnum - (i + 1)));
 848                                         i--;
 849                                         (*endnum)--;
 850                                 }
 851                         }
 852                         UDF_I(inode)->i_lenExtents +=
 853                                 numalloc << inode->i_sb->s_blocksize_bits;
 854                 }
 855         }
 856 }
 857
 858 static void udf_merge_extents(struct inode *inode,
 859                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 860                               int *endnum)
 861 {
 862         int i;
 863         unsigned long blocksize = inode->i_sb->s_blocksize;
 864         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 865
 866         for (i = 0; i < (*endnum - 1); i++) {
 867                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 868                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 869
 870                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 871                         (((li->extLength >> 30) ==
 872                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 873                         ((lip1->extLocation.logicalBlockNum -
 874                           li->extLocation.logicalBlockNum) ==
 875                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 876                         blocksize - 1) >> blocksize_bits)))) {
 877
 878                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 879                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 880                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 881                                 lip1->extLength = (lip1->extLength -
 882                                                   (li->extLength &
 883                                                    UDF_EXTENT_LENGTH_MASK) +
 884                                                    UDF_EXTENT_LENGTH_MASK) &
 885                                                         ~(blocksize - 1);
 886                                 li->extLength = (li->extLength &
 887                                                  UDF_EXTENT_FLAG_MASK) +
 888                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 889                                                 blocksize;
 890                                 lip1->extLocation.logicalBlockNum =
 891                                         li->extLocation.logicalBlockNum +
 892                                         ((li->extLength &
 893                                                 UDF_EXTENT_LENGTH_MASK) >>
 894                                                 blocksize_bits);
 895                         } else {
 896                                 li->extLength = lip1->extLength +
 897                                         (((li->extLength &
 898                                                 UDF_EXTENT_LENGTH_MASK) +
 899                                          blocksize - 1) & ~(blocksize - 1));
 900                                 if (*endnum > (i + 2))
 901                                         memmove(&laarr[i + 1], &laarr[i + 2],
 902                                                 sizeof(struct long_ad) *
 903                                                 (*endnum - (i + 2)));
 904                                 i--;
 905                                 (*endnum)--;
 906                         }
 907                 } else if (((li->extLength >> 30) ==
 908                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 909                            ((lip1->extLength >> 30) ==
 910                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 911                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
 912                                         ((li->extLength &
 913                                           UDF_EXTENT_LENGTH_MASK) +
 914                                          blocksize - 1) >> blocksize_bits);
 915                         li->extLocation.logicalBlockNum = 0;
 916                         li->extLocation.partitionReferenceNum = 0;
 917
 918                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 919                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 920                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 921                                 lip1->extLength = (lip1->extLength -
 922                                                    (li->extLength &
 923                                                    UDF_EXTENT_LENGTH_MASK) +
 924                                                    UDF_EXTENT_LENGTH_MASK) &
 925                                                    ~(blocksize - 1);
 926                                 li->extLength = (li->extLength &
 927                                                  UDF_EXTENT_FLAG_MASK) +
 928                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 929                                                 blocksize;
 930                         } else {
 931                                 li->extLength = lip1->extLength +
 932                                         (((li->extLength &
 933                                                 UDF_EXTENT_LENGTH_MASK) +
 934                                           blocksize - 1) & ~(blocksize - 1));
 935                                 if (*endnum > (i + 2))
 936                                         memmove(&laarr[i + 1], &laarr[i + 2],
 937                                                 sizeof(struct long_ad) *
 938                                                 (*endnum - (i + 2)));
 939                                 i--;
 940                                 (*endnum)--;
 941                         }
 942                 } else if ((li->extLength >> 30) ==
 943                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 944                         udf_free_blocks(inode->i_sb, inode,
 945                                         &li->extLocation, 0,
 946                                         ((li->extLength &
 947                                                 UDF_EXTENT_LENGTH_MASK) +
 948                                          blocksize - 1) >> blocksize_bits);
 949                         li->extLocation.logicalBlockNum = 0;
 950                         li->extLocation.partitionReferenceNum = 0;
 951                         li->extLength = (li->extLength &
 952                                                 UDF_EXTENT_LENGTH_MASK) |
 953                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
 954                 }
 955         }
 956 }
 957
 958 static void udf_update_extents(struct inode *inode,
 959                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 960                                int startnum, int endnum,
 961                                struct extent_position *epos)
 962 {
 963         int start = 0, i;
 964         struct kernel_lb_addr tmploc;
 965         uint32_t tmplen;
 966
 967         if (startnum > endnum) {
 968                 for (i = 0; i < (startnum - endnum); i++)
 969                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
 970                                         laarr[i].extLength);
 971         } else if (startnum < endnum) {
 972                 for (i = 0; i < (endnum - startnum); i++) {
 973                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
 974                                         laarr[i].extLength);
 975                         udf_next_aext(inode, epos, &laarr[i].extLocation,
 976                                       &laarr[i].extLength, 1);
 977                         start++;
 978                 }
 979         }
 980
 981         for (i = start; i < endnum; i++) {
 982                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
 983                 udf_write_aext(inode, epos, &laarr[i].extLocation,
 984                                laarr[i].extLength, 1);
 985         }
 986 }
 987
 988 struct buffer_head *udf_bread(struct inode *inode, int block,
 989                               int create, int *err)
 990 {
 991         struct buffer_head *bh = NULL;
 992
 993         bh = udf_getblk(inode, block, create, err);
 994         if (!bh)
 995                 return NULL;
 996
 997         if (buffer_uptodate(bh))
 998                 return bh;
 999
1000         ll_rw_block(READ, 1, &bh);
1001
1002         wait_on_buffer(bh);
1003         if (buffer_uptodate(bh))
1004                 return bh;
1005
1006         brelse(bh);
1007         *err = -EIO;
1008         return NULL;
1009 }
1010
1011 void udf_truncate(struct inode *inode)
1012 {
1013         int offset;
1014         int err;
1015         struct udf_inode_info *iinfo;
1016
1017         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1018               S_ISLNK(inode->i_mode)))
1019                 return;
1020         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1021                 return;
1022
1023         iinfo = UDF_I(inode);
1024         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1025                 down_write(&iinfo->i_data_sem);
1026                 if (inode->i_sb->s_blocksize <
1027                                 (udf_file_entry_alloc_offset(inode) +
1028                                  inode->i_size)) {
1029                         udf_expand_file_adinicb(inode, inode->i_size, &err);
1030                         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1031                                 inode->i_size = iinfo->i_lenAlloc;
1032                                 up_write(&iinfo->i_data_sem);
1033                                 return;
1034                         } else
1035                                 udf_truncate_extents(inode);
1036                 } else {
1037                         offset = inode->i_size & (inode->i_sb->s_blocksize - 1);
1038                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
1039                                 0x00, inode->i_sb->s_blocksize -
1040                                 offset - udf_file_entry_alloc_offset(inode));
1041                         iinfo->i_lenAlloc = inode->i_size;
1042                 }
1043                 up_write(&iinfo->i_data_sem);
1044         } else {
1045                 block_truncate_page(inode->i_mapping, inode->i_size,
1046                                     udf_get_block);
1047                 down_write(&iinfo->i_data_sem);
1048                 udf_truncate_extents(inode);
1049                 up_write(&iinfo->i_data_sem);
1050         }
1051
1052         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1053         if (IS_SYNC(inode))
1054                 udf_sync_inode(inode);
1055         else
1056                 mark_inode_dirty(inode);
1057 }
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                         struct 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(struct 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         read_lock(&sbi->s_cred_lock);
1206         inode->i_uid = le32_to_cpu(fe->uid);
1207         if (inode->i_uid == -1 ||
1208             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1209             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1210                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1211
1212         inode->i_gid = le32_to_cpu(fe->gid);
1213         if (inode->i_gid == -1 ||
1214             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1215             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1216                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1217
1218         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1219                         sbi->s_fmode != UDF_INVALID_MODE)
1220                 inode->i_mode = sbi->s_fmode;
1221         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1222                         sbi->s_dmode != UDF_INVALID_MODE)
1223                 inode->i_mode = sbi->s_dmode;
1224         else
1225                 inode->i_mode = udf_convert_permissions(fe);
1226         inode->i_mode &= ~sbi->s_umask;
1227         read_unlock(&sbi->s_cred_lock);
1228
1229         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1230         if (!inode->i_nlink)
1231                 inode->i_nlink = 1;
1232
1233         inode->i_size = le64_to_cpu(fe->informationLength);
1234         iinfo->i_lenExtents = inode->i_size;
1235
1236         if (iinfo->i_efe == 0) {
1237                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1238                         (inode->i_sb->s_blocksize_bits - 9);
1239
1240                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1241                         inode->i_atime = sbi->s_record_time;
1242
1243                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1244                                             fe->modificationTime))
1245                         inode->i_mtime = sbi->s_record_time;
1246
1247                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1248                         inode->i_ctime = sbi->s_record_time;
1249
1250                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1251                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1252                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1253                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1254         } else {
1255                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1256                     (inode->i_sb->s_blocksize_bits - 9);
1257
1258                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1259                         inode->i_atime = sbi->s_record_time;
1260
1261                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1262                                             efe->modificationTime))
1263                         inode->i_mtime = sbi->s_record_time;
1264
1265                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1266                         iinfo->i_crtime = sbi->s_record_time;
1267
1268                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1269                         inode->i_ctime = sbi->s_record_time;
1270
1271                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1272                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1273                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1274                 offset = sizeof(struct extendedFileEntry) +
1275                                                         iinfo->i_lenEAttr;
1276         }
1277
1278         switch (fe->icbTag.fileType) {
1279         case ICBTAG_FILE_TYPE_DIRECTORY:
1280                 inode->i_op = &udf_dir_inode_operations;
1281                 inode->i_fop = &udf_dir_operations;
1282                 inode->i_mode |= S_IFDIR;
1283                 inc_nlink(inode);
1284                 break;
1285         case ICBTAG_FILE_TYPE_REALTIME:
1286         case ICBTAG_FILE_TYPE_REGULAR:
1287         case ICBTAG_FILE_TYPE_UNDEF:
1288         case ICBTAG_FILE_TYPE_VAT20:
1289                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1290                         inode->i_data.a_ops = &udf_adinicb_aops;
1291                 else
1292                         inode->i_data.a_ops = &udf_aops;
1293                 inode->i_op = &udf_file_inode_operations;
1294                 inode->i_fop = &udf_file_operations;
1295                 inode->i_mode |= S_IFREG;
1296                 break;
1297         case ICBTAG_FILE_TYPE_BLOCK:
1298                 inode->i_mode |= S_IFBLK;
1299                 break;
1300         case ICBTAG_FILE_TYPE_CHAR:
1301                 inode->i_mode |= S_IFCHR;
1302                 break;
1303         case ICBTAG_FILE_TYPE_FIFO:
1304                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1305                 break;
1306         case ICBTAG_FILE_TYPE_SOCKET:
1307                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1308                 break;
1309         case ICBTAG_FILE_TYPE_SYMLINK:
1310                 inode->i_data.a_ops = &udf_symlink_aops;
1311                 inode->i_op = &udf_symlink_inode_operations;
1312                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1313                 break;
1314         case ICBTAG_FILE_TYPE_MAIN:
1315                 udf_debug("METADATA FILE-----\n");
1316                 break;
1317         case ICBTAG_FILE_TYPE_MIRROR:
1318                 udf_debug("METADATA MIRROR FILE-----\n");
1319                 break;
1320         case ICBTAG_FILE_TYPE_BITMAP:
1321                 udf_debug("METADATA BITMAP FILE-----\n");
1322                 break;
1323         default:
1324                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1325                                 "file type=%d\n", inode->i_ino,
1326                                 fe->icbTag.fileType);
1327                 make_bad_inode(inode);
1328                 return;
1329         }
1330         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1331                 struct deviceSpec *dsea =
1332                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1333                 if (dsea) {
1334                         init_special_inode(inode, inode->i_mode,
1335                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1336                                       le32_to_cpu(dsea->minorDeviceIdent)));
1337                         /* Developer ID ??? */
1338                 } else
1339                         make_bad_inode(inode);
1340         }
1341 }
1342
1343 static int udf_alloc_i_data(struct inode *inode, size_t size)
1344 {
1345         struct udf_inode_info *iinfo = UDF_I(inode);
1346         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1347
1348         if (!iinfo->i_ext.i_data) {
1349                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1350                                 "no free memory\n", inode->i_ino);
1351                 return -ENOMEM;
1352         }
1353
1354         return 0;
1355 }
1356
1357 static mode_t udf_convert_permissions(struct fileEntry *fe)
1358 {
1359         mode_t mode;
1360         uint32_t permissions;
1361         uint32_t flags;
1362
1363         permissions = le32_to_cpu(fe->permissions);
1364         flags = le16_to_cpu(fe->icbTag.flags);
1365
1366         mode =  ((permissions) & S_IRWXO) |
1367                 ((permissions >> 2) & S_IRWXG) |
1368                 ((permissions >> 4) & S_IRWXU) |
1369                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1370                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1371                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1372
1373         return mode;
1374 }
1375
1376 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1377 {
1378         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1379 }
1380
1381 static int udf_sync_inode(struct inode *inode)
1382 {
1383         return udf_update_inode(inode, 1);
1384 }
1385
1386 static int udf_update_inode(struct inode *inode, int do_sync)
1387 {
1388         struct buffer_head *bh = NULL;
1389         struct fileEntry *fe;
1390         struct extendedFileEntry *efe;
1391         uint32_t udfperms;
1392         uint16_t icbflags;
1393         uint16_t crclen;
1394         int err = 0;
1395         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1396         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1397         struct udf_inode_info *iinfo = UDF_I(inode);
1398
1399         bh = udf_tgetblk(inode->i_sb,
1400                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1401         if (!bh) {
1402                 udf_debug("getblk failure\n");
1403                 return -ENOMEM;
1404         }
1405
1406         lock_buffer(bh);
1407         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1408         fe = (struct fileEntry *)bh->b_data;
1409         efe = (struct extendedFileEntry *)bh->b_data;
1410
1411         if (iinfo->i_use) {
1412                 struct unallocSpaceEntry *use =
1413                         (struct unallocSpaceEntry *)bh->b_data;
1414
1415                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1416                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1417                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1418                                         sizeof(struct unallocSpaceEntry));
1419                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1420                 use->descTag.tagLocation =
1421                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1422                 crclen = sizeof(struct unallocSpaceEntry) +
1423                                 iinfo->i_lenAlloc - sizeof(struct tag);
1424                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1425                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1426                                                            sizeof(struct tag),
1427                                                            crclen));
1428                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1429
1430                 goto out;
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                 struct 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(struct 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(struct regid));
1474                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1475                 }
1476                 eid = (struct regid *)dsea->impUse;
1477                 memset(eid, 0, sizeof(struct 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(struct 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(struct 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 - sizeof(struct tag);
1586         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1587         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1588                                                   crclen));
1589         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1590
1591 out:
1592         set_buffer_uptodate(bh);
1593         unlock_buffer(bh);
1594
1595         /* write the data blocks */
1596         mark_buffer_dirty(bh);
1597         if (do_sync) {
1598                 sync_dirty_buffer(bh);
1599                 if (buffer_write_io_error(bh)) {
1600                         printk(KERN_WARNING "IO error syncing udf inode "
1601                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1602                                 inode->i_ino);
1603                         err = -EIO;
1604                 }
1605         }
1606         brelse(bh);
1607
1608         return err;
1609 }
1610
1611 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1612 {
1613         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1614         struct inode *inode = iget_locked(sb, block);
1615
1616         if (!inode)
1617                 return NULL;
1618
1619         if (inode->i_state & I_NEW) {
1620                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1621                 __udf_read_inode(inode);
1622                 unlock_new_inode(inode);
1623         }
1624
1625         if (is_bad_inode(inode))
1626                 goto out_iput;
1627
1628         if (ino->logicalBlockNum >= UDF_SB(sb)->
1629                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1630                 udf_debug("block=%d, partition=%d out of range\n",
1631                           ino->logicalBlockNum, ino->partitionReferenceNum);
1632                 make_bad_inode(inode);
1633                 goto out_iput;
1634         }
1635
1636         return inode;
1637
1638  out_iput:
1639         iput(inode);
1640         return NULL;
1641 }
1642
1643 int8_t udf_add_aext(struct inode *inode, struct extent_position *epos,
1644                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1645 {
1646         int adsize;
1647         struct short_ad *sad = NULL;
1648         struct long_ad *lad = NULL;
1649         struct allocExtDesc *aed;
1650         int8_t etype;
1651         uint8_t *ptr;
1652         struct udf_inode_info *iinfo = UDF_I(inode);
1653
1654         if (!epos->bh)
1655                 ptr = iinfo->i_ext.i_data + epos->offset -
1656                         udf_file_entry_alloc_offset(inode) +
1657                         iinfo->i_lenEAttr;
1658         else
1659                 ptr = epos->bh->b_data + epos->offset;
1660
1661         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1662                 adsize = sizeof(struct short_ad);
1663         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1664                 adsize = sizeof(struct long_ad);
1665         else
1666                 return -1;
1667
1668         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1669                 unsigned char *sptr, *dptr;
1670                 struct buffer_head *nbh;
1671                 int err, loffset;
1672                 struct kernel_lb_addr obloc = epos->block;
1673
1674                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1675                                                 obloc.partitionReferenceNum,
1676                                                 obloc.logicalBlockNum, &err);
1677                 if (!epos->block.logicalBlockNum)
1678                         return -1;
1679                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1680                                                                  &epos->block,
1681                                                                  0));
1682                 if (!nbh)
1683                         return -1;
1684                 lock_buffer(nbh);
1685                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1686                 set_buffer_uptodate(nbh);
1687                 unlock_buffer(nbh);
1688                 mark_buffer_dirty_inode(nbh, inode);
1689
1690                 aed = (struct allocExtDesc *)(nbh->b_data);
1691                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1692                         aed->previousAllocExtLocation =
1693                                         cpu_to_le32(obloc.logicalBlockNum);
1694                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1695                         loffset = epos->offset;
1696                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1697                         sptr = ptr - adsize;
1698                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1699                         memcpy(dptr, sptr, adsize);
1700                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1701                 } else {
1702                         loffset = epos->offset + adsize;
1703                         aed->lengthAllocDescs = cpu_to_le32(0);
1704                         sptr = ptr;
1705                         epos->offset = sizeof(struct allocExtDesc);
1706
1707                         if (epos->bh) {
1708                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1709                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1710                         } else {
1711                                 iinfo->i_lenAlloc += adsize;
1712                                 mark_inode_dirty(inode);
1713                         }
1714                 }
1715                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1716                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1717                                     epos->block.logicalBlockNum, sizeof(struct tag));
1718                 else
1719                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1720                                     epos->block.logicalBlockNum, sizeof(struct tag));
1721                 switch (iinfo->i_alloc_type) {
1722                 case ICBTAG_FLAG_AD_SHORT:
1723                         sad = (struct short_ad *)sptr;
1724                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1725                                                      inode->i_sb->s_blocksize);
1726                         sad->extPosition =
1727                                 cpu_to_le32(epos->block.logicalBlockNum);
1728                         break;
1729                 case ICBTAG_FLAG_AD_LONG:
1730                         lad = (struct long_ad *)sptr;
1731                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1732                                                      inode->i_sb->s_blocksize);
1733                         lad->extLocation = cpu_to_lelb(epos->block);
1734                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1735                         break;
1736                 }
1737                 if (epos->bh) {
1738                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1739                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1740                                 udf_update_tag(epos->bh->b_data, loffset);
1741                         else
1742                                 udf_update_tag(epos->bh->b_data,
1743                                                 sizeof(struct allocExtDesc));
1744                         mark_buffer_dirty_inode(epos->bh, inode);
1745                         brelse(epos->bh);
1746                 } else {
1747                         mark_inode_dirty(inode);
1748                 }
1749                 epos->bh = nbh;
1750         }
1751
1752         etype = udf_write_aext(inode, epos, eloc, elen, inc);
1753
1754         if (!epos->bh) {
1755                 iinfo->i_lenAlloc += adsize;
1756                 mark_inode_dirty(inode);
1757         } else {
1758                 aed = (struct allocExtDesc *)epos->bh->b_data;
1759                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1760                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1761                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1762                         udf_update_tag(epos->bh->b_data,
1763                                         epos->offset + (inc ? 0 : adsize));
1764                 else
1765                         udf_update_tag(epos->bh->b_data,
1766                                         sizeof(struct allocExtDesc));
1767                 mark_buffer_dirty_inode(epos->bh, inode);
1768         }
1769
1770         return etype;
1771 }
1772
1773 int8_t udf_write_aext(struct inode *inode, struct extent_position *epos,
1774                       struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1775 {
1776         int adsize;
1777         uint8_t *ptr;
1778         struct short_ad *sad;
1779         struct long_ad *lad;
1780         struct udf_inode_info *iinfo = UDF_I(inode);
1781
1782         if (!epos->bh)
1783                 ptr = iinfo->i_ext.i_data + epos->offset -
1784                         udf_file_entry_alloc_offset(inode) +
1785                         iinfo->i_lenEAttr;
1786         else
1787                 ptr = epos->bh->b_data + epos->offset;
1788
1789         switch (iinfo->i_alloc_type) {
1790         case ICBTAG_FLAG_AD_SHORT:
1791                 sad = (struct short_ad *)ptr;
1792                 sad->extLength = cpu_to_le32(elen);
1793                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1794                 adsize = sizeof(struct short_ad);
1795                 break;
1796         case ICBTAG_FLAG_AD_LONG:
1797                 lad = (struct long_ad *)ptr;
1798                 lad->extLength = cpu_to_le32(elen);
1799                 lad->extLocation = cpu_to_lelb(*eloc);
1800                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1801                 adsize = sizeof(struct long_ad);
1802                 break;
1803         default:
1804                 return -1;
1805         }
1806
1807         if (epos->bh) {
1808                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1809                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1810                         struct allocExtDesc *aed =
1811                                 (struct allocExtDesc *)epos->bh->b_data;
1812                         udf_update_tag(epos->bh->b_data,
1813                                        le32_to_cpu(aed->lengthAllocDescs) +
1814                                        sizeof(struct allocExtDesc));
1815                 }
1816                 mark_buffer_dirty_inode(epos->bh, inode);
1817         } else {
1818                 mark_inode_dirty(inode);
1819         }
1820
1821         if (inc)
1822                 epos->offset += adsize;
1823
1824         return (elen >> 30);
1825 }
1826
1827 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1828                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1829 {
1830         int8_t etype;
1831
1832         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1833                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1834                 int block;
1835                 epos->block = *eloc;
1836                 epos->offset = sizeof(struct allocExtDesc);
1837                 brelse(epos->bh);
1838                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1839                 epos->bh = udf_tread(inode->i_sb, block);
1840                 if (!epos->bh) {
1841                         udf_debug("reading block %d failed!\n", block);
1842                         return -1;
1843                 }
1844         }
1845
1846         return etype;
1847 }
1848
1849 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1850                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1851 {
1852         int alen;
1853         int8_t etype;
1854         uint8_t *ptr;
1855         struct short_ad *sad;
1856         struct long_ad *lad;
1857         struct udf_inode_info *iinfo = UDF_I(inode);
1858
1859         if (!epos->bh) {
1860                 if (!epos->offset)
1861                         epos->offset = udf_file_entry_alloc_offset(inode);
1862                 ptr = iinfo->i_ext.i_data + epos->offset -
1863                         udf_file_entry_alloc_offset(inode) +
1864                         iinfo->i_lenEAttr;
1865                 alen = udf_file_entry_alloc_offset(inode) +
1866                                                         iinfo->i_lenAlloc;
1867         } else {
1868                 if (!epos->offset)
1869                         epos->offset = sizeof(struct allocExtDesc);
1870                 ptr = epos->bh->b_data + epos->offset;
1871                 alen = sizeof(struct allocExtDesc) +
1872                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1873                                                         lengthAllocDescs);
1874         }
1875
1876         switch (iinfo->i_alloc_type) {
1877         case ICBTAG_FLAG_AD_SHORT:
1878                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1879                 if (!sad)
1880                         return -1;
1881                 etype = le32_to_cpu(sad->extLength) >> 30;
1882                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1883                 eloc->partitionReferenceNum =
1884                                 iinfo->i_location.partitionReferenceNum;
1885                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1886                 break;
1887         case ICBTAG_FLAG_AD_LONG:
1888                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1889                 if (!lad)
1890                         return -1;
1891                 etype = le32_to_cpu(lad->extLength) >> 30;
1892                 *eloc = lelb_to_cpu(lad->extLocation);
1893                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1894                 break;
1895         default:
1896                 udf_debug("alloc_type = %d unsupported\n",
1897                                 iinfo->i_alloc_type);
1898                 return -1;
1899         }
1900
1901         return etype;
1902 }
1903
1904 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1905                               struct kernel_lb_addr neloc, uint32_t nelen)
1906 {
1907         struct kernel_lb_addr oeloc;
1908         uint32_t oelen;
1909         int8_t etype;
1910
1911         if (epos.bh)
1912                 get_bh(epos.bh);
1913
1914         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
1915                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
1916                 neloc = oeloc;
1917                 nelen = (etype << 30) | oelen;
1918         }
1919         udf_add_aext(inode, &epos, &neloc, nelen, 1);
1920         brelse(epos.bh);
1921
1922         return (nelen >> 30);
1923 }
1924
1925 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
1926                        struct kernel_lb_addr eloc, uint32_t elen)
1927 {
1928         struct extent_position oepos;
1929         int adsize;
1930         int8_t etype;
1931         struct allocExtDesc *aed;
1932         struct udf_inode_info *iinfo;
1933
1934         if (epos.bh) {
1935                 get_bh(epos.bh);
1936                 get_bh(epos.bh);
1937         }
1938
1939         iinfo = UDF_I(inode);
1940         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1941                 adsize = sizeof(struct short_ad);
1942         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1943                 adsize = sizeof(struct long_ad);
1944         else
1945                 adsize = 0;
1946
1947         oepos = epos;
1948         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
1949                 return -1;
1950
1951         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
1952                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
1953                 if (oepos.bh != epos.bh) {
1954                         oepos.block = epos.block;
1955                         brelse(oepos.bh);
1956                         get_bh(epos.bh);
1957                         oepos.bh = epos.bh;
1958                         oepos.offset = epos.offset - adsize;
1959                 }
1960         }
1961         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
1962         elen = 0;
1963
1964         if (epos.bh != oepos.bh) {
1965                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
1966                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1967                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1968                 if (!oepos.bh) {
1969                         iinfo->i_lenAlloc -= (adsize * 2);
1970                         mark_inode_dirty(inode);
1971                 } else {
1972                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1973                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
1974                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1975                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1976                                 udf_update_tag(oepos.bh->b_data,
1977                                                 oepos.offset - (2 * adsize));
1978                         else
1979                                 udf_update_tag(oepos.bh->b_data,
1980                                                 sizeof(struct allocExtDesc));
1981                         mark_buffer_dirty_inode(oepos.bh, inode);
1982                 }
1983         } else {
1984                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
1985                 if (!oepos.bh) {
1986                         iinfo->i_lenAlloc -= adsize;
1987                         mark_inode_dirty(inode);
1988                 } else {
1989                         aed = (struct allocExtDesc *)oepos.bh->b_data;
1990                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
1991                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1992                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1993                                 udf_update_tag(oepos.bh->b_data,
1994                                                 epos.offset - adsize);
1995                         else
1996                                 udf_update_tag(oepos.bh->b_data,
1997                                                 sizeof(struct allocExtDesc));
1998                         mark_buffer_dirty_inode(oepos.bh, inode);
1999                 }
2000         }
2001
2002         brelse(epos.bh);
2003         brelse(oepos.bh);
2004
2005         return (elen >> 30);
2006 }
2007
2008 int8_t inode_bmap(struct inode *inode, sector_t block,
2009                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2010                   uint32_t *elen, sector_t *offset)
2011 {
2012         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2013         loff_t lbcount = 0, bcount =
2014             (loff_t) block << blocksize_bits;
2015         int8_t etype;
2016         struct udf_inode_info *iinfo;
2017
2018         iinfo = UDF_I(inode);
2019         pos->offset = 0;
2020         pos->block = iinfo->i_location;
2021         pos->bh = NULL;
2022         *elen = 0;
2023
2024         do {
2025                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2026                 if (etype == -1) {
2027                         *offset = (bcount - lbcount) >> blocksize_bits;
2028                         iinfo->i_lenExtents = lbcount;
2029                         return -1;
2030                 }
2031                 lbcount += *elen;
2032         } while (lbcount <= bcount);
2033
2034         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2035
2036         return etype;
2037 }
2038
2039 long udf_block_map(struct inode *inode, sector_t block)
2040 {
2041         struct kernel_lb_addr eloc;
2042         uint32_t elen;
2043         sector_t offset;
2044         struct extent_position epos = {};
2045         int ret;
2046
2047         down_read(&UDF_I(inode)->i_data_sem);
2048
2049         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2050                                                 (EXT_RECORDED_ALLOCATED >> 30))
2051                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2052         else
2053                 ret = 0;
2054
2055         up_read(&UDF_I(inode)->i_data_sem);
2056         brelse(epos.bh);
2057
2058         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2059                 return udf_fixed_to_variable(ret);
2060         else
2061                 return ret;
2062 }