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/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38 #include <linux/slab.h>
  39 #include <linux/crc-itu-t.h>
  40 #include <linux/mpage.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 umode_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 sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  58                               struct kernel_lb_addr, uint32_t);
  59 static void udf_split_extents(struct inode *, int *, int, int,
  60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_prealloc_extents(struct inode *, int, int,
  62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_merge_extents(struct inode *,
  64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  65 static void udf_update_extents(struct inode *,
  66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  67                                struct extent_position *);
  68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  69
  70
  71 void udf_evict_inode(struct inode *inode)
  72 {
  73         struct udf_inode_info *iinfo = UDF_I(inode);
  74         int want_delete = 0;
  75
  76         if (!inode->i_nlink && !is_bad_inode(inode)) {
  77                 want_delete = 1;
  78                 udf_setsize(inode, 0);
  79                 udf_update_inode(inode, IS_SYNC(inode));
  80         } else
  81                 truncate_inode_pages(&inode->i_data, 0);
  82         invalidate_inode_buffers(inode);
  83         clear_inode(inode);
  84         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
  85             inode->i_size != iinfo->i_lenExtents) {
  86                 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
  87                          inode->i_ino, inode->i_mode,
  88                          (unsigned long long)inode->i_size,
  89                          (unsigned long long)iinfo->i_lenExtents);
  90         }
  91         kfree(iinfo->i_ext.i_data);
  92         iinfo->i_ext.i_data = NULL;
  93         if (want_delete) {
  94                 udf_free_inode(inode);
  95         }
  96 }
  97
  98 static void udf_write_failed(struct address_space *mapping, loff_t to)
  99 {
 100         struct inode *inode = mapping->host;
 101         struct udf_inode_info *iinfo = UDF_I(inode);
 102         loff_t isize = inode->i_size;
 103
 104         if (to > isize) {
 105                 truncate_pagecache(inode, to, isize);
 106                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 107                         down_write(&iinfo->i_data_sem);
 108                         udf_truncate_extents(inode);
 109                         up_write(&iinfo->i_data_sem);
 110                 }
 111         }
 112 }
 113
 114 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 115 {
 116         return block_write_full_page(page, udf_get_block, wbc);
 117 }
 118
 119 static int udf_writepages(struct address_space *mapping,
 120                         struct writeback_control *wbc)
 121 {
 122         return mpage_writepages(mapping, wbc, udf_get_block);
 123 }
 124
 125 static int udf_readpage(struct file *file, struct page *page)
 126 {
 127         return mpage_readpage(page, udf_get_block);
 128 }
 129
 130 static int udf_readpages(struct file *file, struct address_space *mapping,
 131                         struct list_head *pages, unsigned nr_pages)
 132 {
 133         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 134 }
 135
 136 static int udf_write_begin(struct file *file, struct address_space *mapping,
 137                         loff_t pos, unsigned len, unsigned flags,
 138                         struct page **pagep, void **fsdata)
 139 {
 140         int ret;
 141
 142         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 143         if (unlikely(ret))
 144                 udf_write_failed(mapping, pos + len);
 145         return ret;
 146 }
 147
 148 static ssize_t udf_direct_IO(int rw, struct kiocb *iocb,
 149                              const struct iovec *iov,
 150                              loff_t offset, unsigned long nr_segs)
 151 {
 152         struct file *file = iocb->ki_filp;
 153         struct address_space *mapping = file->f_mapping;
 154         struct inode *inode = mapping->host;
 155         ssize_t ret;
 156
 157         ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
 158                                   udf_get_block);
 159         if (unlikely(ret < 0 && (rw & WRITE)))
 160                 udf_write_failed(mapping, offset + iov_length(iov, nr_segs));
 161         return ret;
 162 }
 163
 164 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 165 {
 166         return generic_block_bmap(mapping, block, udf_get_block);
 167 }
 168
 169 const struct address_space_operations udf_aops = {
 170         .readpage       = udf_readpage,
 171         .readpages      = udf_readpages,
 172         .writepage      = udf_writepage,
 173         .writepages     = udf_writepages,
 174         .write_begin    = udf_write_begin,
 175         .write_end      = generic_write_end,
 176         .direct_IO      = udf_direct_IO,
 177         .bmap           = udf_bmap,
 178 };
 179
 180 /*
 181  * Expand file stored in ICB to a normal one-block-file
 182  *
 183  * This function requires i_data_sem for writing and releases it.
 184  * This function requires i_mutex held
 185  */
 186 int udf_expand_file_adinicb(struct inode *inode)
 187 {
 188         struct page *page;
 189         char *kaddr;
 190         struct udf_inode_info *iinfo = UDF_I(inode);
 191         int err;
 192         struct writeback_control udf_wbc = {
 193                 .sync_mode = WB_SYNC_NONE,
 194                 .nr_to_write = 1,
 195         };
 196
 197         if (!iinfo->i_lenAlloc) {
 198                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 199                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 200                 else
 201                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 202                 /* from now on we have normal address_space methods */
 203                 inode->i_data.a_ops = &udf_aops;
 204                 up_write(&iinfo->i_data_sem);
 205                 mark_inode_dirty(inode);
 206                 return 0;
 207         }
 208         /*
 209          * Release i_data_sem so that we can lock a page - page lock ranks
 210          * above i_data_sem. i_mutex still protects us against file changes.
 211          */
 212         up_write(&iinfo->i_data_sem);
 213
 214         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 215         if (!page)
 216                 return -ENOMEM;
 217
 218         if (!PageUptodate(page)) {
 219                 kaddr = kmap(page);
 220                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 221                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 222                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 223                         iinfo->i_lenAlloc);
 224                 flush_dcache_page(page);
 225                 SetPageUptodate(page);
 226                 kunmap(page);
 227         }
 228         down_write(&iinfo->i_data_sem);
 229         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 230                iinfo->i_lenAlloc);
 231         iinfo->i_lenAlloc = 0;
 232         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 233                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 234         else
 235                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 236         /* from now on we have normal address_space methods */
 237         inode->i_data.a_ops = &udf_aops;
 238         up_write(&iinfo->i_data_sem);
 239         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 240         if (err) {
 241                 /* Restore everything back so that we don't lose data... */
 242                 lock_page(page);
 243                 kaddr = kmap(page);
 244                 down_write(&iinfo->i_data_sem);
 245                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 246                        inode->i_size);
 247                 kunmap(page);
 248                 unlock_page(page);
 249                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 250                 inode->i_data.a_ops = &udf_adinicb_aops;
 251                 up_write(&iinfo->i_data_sem);
 252         }
 253         page_cache_release(page);
 254         mark_inode_dirty(inode);
 255
 256         return err;
 257 }
 258
 259 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 260                                            int *err)
 261 {
 262         int newblock;
 263         struct buffer_head *dbh = NULL;
 264         struct kernel_lb_addr eloc;
 265         uint8_t alloctype;
 266         struct extent_position epos;
 267
 268         struct udf_fileident_bh sfibh, dfibh;
 269         loff_t f_pos = udf_ext0_offset(inode);
 270         int size = udf_ext0_offset(inode) + inode->i_size;
 271         struct fileIdentDesc cfi, *sfi, *dfi;
 272         struct udf_inode_info *iinfo = UDF_I(inode);
 273
 274         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 275                 alloctype = ICBTAG_FLAG_AD_SHORT;
 276         else
 277                 alloctype = ICBTAG_FLAG_AD_LONG;
 278
 279         if (!inode->i_size) {
 280                 iinfo->i_alloc_type = alloctype;
 281                 mark_inode_dirty(inode);
 282                 return NULL;
 283         }
 284
 285         /* alloc block, and copy data to it */
 286         *block = udf_new_block(inode->i_sb, inode,
 287                                iinfo->i_location.partitionReferenceNum,
 288                                iinfo->i_location.logicalBlockNum, err);
 289         if (!(*block))
 290                 return NULL;
 291         newblock = udf_get_pblock(inode->i_sb, *block,
 292                                   iinfo->i_location.partitionReferenceNum,
 293                                 0);
 294         if (!newblock)
 295                 return NULL;
 296         dbh = udf_tgetblk(inode->i_sb, newblock);
 297         if (!dbh)
 298                 return NULL;
 299         lock_buffer(dbh);
 300         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 301         set_buffer_uptodate(dbh);
 302         unlock_buffer(dbh);
 303         mark_buffer_dirty_inode(dbh, inode);
 304
 305         sfibh.soffset = sfibh.eoffset =
 306                         f_pos & (inode->i_sb->s_blocksize - 1);
 307         sfibh.sbh = sfibh.ebh = NULL;
 308         dfibh.soffset = dfibh.eoffset = 0;
 309         dfibh.sbh = dfibh.ebh = dbh;
 310         while (f_pos < size) {
 311                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 312                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 313                                          NULL, NULL, NULL);
 314                 if (!sfi) {
 315                         brelse(dbh);
 316                         return NULL;
 317                 }
 318                 iinfo->i_alloc_type = alloctype;
 319                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 320                 dfibh.soffset = dfibh.eoffset;
 321                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 322                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 323                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 324                                  sfi->fileIdent +
 325                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 326                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 327                         brelse(dbh);
 328                         return NULL;
 329                 }
 330         }
 331         mark_buffer_dirty_inode(dbh, inode);
 332
 333         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 334                 iinfo->i_lenAlloc);
 335         iinfo->i_lenAlloc = 0;
 336         eloc.logicalBlockNum = *block;
 337         eloc.partitionReferenceNum =
 338                                 iinfo->i_location.partitionReferenceNum;
 339         iinfo->i_lenExtents = inode->i_size;
 340         epos.bh = NULL;
 341         epos.block = iinfo->i_location;
 342         epos.offset = udf_file_entry_alloc_offset(inode);
 343         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 344         /* UniqueID stuff */
 345
 346         brelse(epos.bh);
 347         mark_inode_dirty(inode);
 348         return dbh;
 349 }
 350
 351 static int udf_get_block(struct inode *inode, sector_t block,
 352                          struct buffer_head *bh_result, int create)
 353 {
 354         int err, new;
 355         sector_t phys = 0;
 356         struct udf_inode_info *iinfo;
 357
 358         if (!create) {
 359                 phys = udf_block_map(inode, block);
 360                 if (phys)
 361                         map_bh(bh_result, inode->i_sb, phys);
 362                 return 0;
 363         }
 364
 365         err = -EIO;
 366         new = 0;
 367         iinfo = UDF_I(inode);
 368
 369         down_write(&iinfo->i_data_sem);
 370         if (block == iinfo->i_next_alloc_block + 1) {
 371                 iinfo->i_next_alloc_block++;
 372                 iinfo->i_next_alloc_goal++;
 373         }
 374
 375
 376         phys = inode_getblk(inode, block, &err, &new);
 377         if (!phys)
 378                 goto abort;
 379
 380         if (new)
 381                 set_buffer_new(bh_result);
 382         map_bh(bh_result, inode->i_sb, phys);
 383
 384 abort:
 385         up_write(&iinfo->i_data_sem);
 386         return err;
 387 }
 388
 389 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 390                                       int create, int *err)
 391 {
 392         struct buffer_head *bh;
 393         struct buffer_head dummy;
 394
 395         dummy.b_state = 0;
 396         dummy.b_blocknr = -1000;
 397         *err = udf_get_block(inode, block, &dummy, create);
 398         if (!*err && buffer_mapped(&dummy)) {
 399                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 400                 if (buffer_new(&dummy)) {
 401                         lock_buffer(bh);
 402                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 403                         set_buffer_uptodate(bh);
 404                         unlock_buffer(bh);
 405                         mark_buffer_dirty_inode(bh, inode);
 406                 }
 407                 return bh;
 408         }
 409
 410         return NULL;
 411 }
 412
 413 /* Extend the file by 'blocks' blocks, return the number of extents added */
 414 static int udf_do_extend_file(struct inode *inode,
 415                               struct extent_position *last_pos,
 416                               struct kernel_long_ad *last_ext,
 417                               sector_t blocks)
 418 {
 419         sector_t add;
 420         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 421         struct super_block *sb = inode->i_sb;
 422         struct kernel_lb_addr prealloc_loc = {};
 423         int prealloc_len = 0;
 424         struct udf_inode_info *iinfo;
 425         int err;
 426
 427         /* The previous extent is fake and we should not extend by anything
 428          * - there's nothing to do... */
 429         if (!blocks && fake)
 430                 return 0;
 431
 432         iinfo = UDF_I(inode);
 433         /* Round the last extent up to a multiple of block size */
 434         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 435                 last_ext->extLength =
 436                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 437                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 438                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 439                 iinfo->i_lenExtents =
 440                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 441                         ~(sb->s_blocksize - 1);
 442         }
 443
 444         /* Last extent are just preallocated blocks? */
 445         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 446                                                 EXT_NOT_RECORDED_ALLOCATED) {
 447                 /* Save the extent so that we can reattach it to the end */
 448                 prealloc_loc = last_ext->extLocation;
 449                 prealloc_len = last_ext->extLength;
 450                 /* Mark the extent as a hole */
 451                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 452                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 453                 last_ext->extLocation.logicalBlockNum = 0;
 454                 last_ext->extLocation.partitionReferenceNum = 0;
 455         }
 456
 457         /* Can we merge with the previous extent? */
 458         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 459                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 460                 add = ((1 << 30) - sb->s_blocksize -
 461                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 462                         sb->s_blocksize_bits;
 463                 if (add > blocks)
 464                         add = blocks;
 465                 blocks -= add;
 466                 last_ext->extLength += add << sb->s_blocksize_bits;
 467         }
 468
 469         if (fake) {
 470                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 471                              last_ext->extLength, 1);
 472                 count++;
 473         } else
 474                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 475                                 last_ext->extLength, 1);
 476
 477         /* Managed to do everything necessary? */
 478         if (!blocks)
 479                 goto out;
 480
 481         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 482         last_ext->extLocation.logicalBlockNum = 0;
 483         last_ext->extLocation.partitionReferenceNum = 0;
 484         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 485         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 486                                 (add << sb->s_blocksize_bits);
 487
 488         /* Create enough extents to cover the whole hole */
 489         while (blocks > add) {
 490                 blocks -= add;
 491                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 492                                    last_ext->extLength, 1);
 493                 if (err)
 494                         return err;
 495                 count++;
 496         }
 497         if (blocks) {
 498                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 499                         (blocks << sb->s_blocksize_bits);
 500                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 501                                    last_ext->extLength, 1);
 502                 if (err)
 503                         return err;
 504                 count++;
 505         }
 506
 507 out:
 508         /* Do we have some preallocated blocks saved? */
 509         if (prealloc_len) {
 510                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 511                                    prealloc_len, 1);
 512                 if (err)
 513                         return err;
 514                 last_ext->extLocation = prealloc_loc;
 515                 last_ext->extLength = prealloc_len;
 516                 count++;
 517         }
 518
 519         /* last_pos should point to the last written extent... */
 520         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 521                 last_pos->offset -= sizeof(struct short_ad);
 522         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 523                 last_pos->offset -= sizeof(struct long_ad);
 524         else
 525                 return -EIO;
 526
 527         return count;
 528 }
 529
 530 static int udf_extend_file(struct inode *inode, loff_t newsize)
 531 {
 532
 533         struct extent_position epos;
 534         struct kernel_lb_addr eloc;
 535         uint32_t elen;
 536         int8_t etype;
 537         struct super_block *sb = inode->i_sb;
 538         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 539         int adsize;
 540         struct udf_inode_info *iinfo = UDF_I(inode);
 541         struct kernel_long_ad extent;
 542         int err;
 543
 544         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 545                 adsize = sizeof(struct short_ad);
 546         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 547                 adsize = sizeof(struct long_ad);
 548         else
 549                 BUG();
 550
 551         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 552
 553         /* File has extent covering the new size (could happen when extending
 554          * inside a block)? */
 555         if (etype != -1)
 556                 return 0;
 557         if (newsize & (sb->s_blocksize - 1))
 558                 offset++;
 559         /* Extended file just to the boundary of the last file block? */
 560         if (offset == 0)
 561                 return 0;
 562
 563         /* Truncate is extending the file by 'offset' blocks */
 564         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 565             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 566                 /* File has no extents at all or has empty last
 567                  * indirect extent! Create a fake extent... */
 568                 extent.extLocation.logicalBlockNum = 0;
 569                 extent.extLocation.partitionReferenceNum = 0;
 570                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 571         } else {
 572                 epos.offset -= adsize;
 573                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 574                                       &extent.extLength, 0);
 575                 extent.extLength |= etype << 30;
 576         }
 577         err = udf_do_extend_file(inode, &epos, &extent, offset);
 578         if (err < 0)
 579                 goto out;
 580         err = 0;
 581         iinfo->i_lenExtents = newsize;
 582 out:
 583         brelse(epos.bh);
 584         return err;
 585 }
 586
 587 static sector_t inode_getblk(struct inode *inode, sector_t block,
 588                              int *err, int *new)
 589 {
 590         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 591         struct extent_position prev_epos, cur_epos, next_epos;
 592         int count = 0, startnum = 0, endnum = 0;
 593         uint32_t elen = 0, tmpelen;
 594         struct kernel_lb_addr eloc, tmpeloc;
 595         int c = 1;
 596         loff_t lbcount = 0, b_off = 0;
 597         uint32_t newblocknum, newblock;
 598         sector_t offset = 0;
 599         int8_t etype;
 600         struct udf_inode_info *iinfo = UDF_I(inode);
 601         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 602         int lastblock = 0;
 603         bool isBeyondEOF;
 604
 605         *err = 0;
 606         *new = 0;
 607         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 608         prev_epos.block = iinfo->i_location;
 609         prev_epos.bh = NULL;
 610         cur_epos = next_epos = prev_epos;
 611         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 612
 613         /* find the extent which contains the block we are looking for.
 614            alternate between laarr[0] and laarr[1] for locations of the
 615            current extent, and the previous extent */
 616         do {
 617                 if (prev_epos.bh != cur_epos.bh) {
 618                         brelse(prev_epos.bh);
 619                         get_bh(cur_epos.bh);
 620                         prev_epos.bh = cur_epos.bh;
 621                 }
 622                 if (cur_epos.bh != next_epos.bh) {
 623                         brelse(cur_epos.bh);
 624                         get_bh(next_epos.bh);
 625                         cur_epos.bh = next_epos.bh;
 626                 }
 627
 628                 lbcount += elen;
 629
 630                 prev_epos.block = cur_epos.block;
 631                 cur_epos.block = next_epos.block;
 632
 633                 prev_epos.offset = cur_epos.offset;
 634                 cur_epos.offset = next_epos.offset;
 635
 636                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 637                 if (etype == -1)
 638                         break;
 639
 640                 c = !c;
 641
 642                 laarr[c].extLength = (etype << 30) | elen;
 643                 laarr[c].extLocation = eloc;
 644
 645                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 646                         pgoal = eloc.logicalBlockNum +
 647                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 648                                  inode->i_sb->s_blocksize_bits);
 649
 650                 count++;
 651         } while (lbcount + elen <= b_off);
 652
 653         b_off -= lbcount;
 654         offset = b_off >> inode->i_sb->s_blocksize_bits;
 655         /*
 656          * Move prev_epos and cur_epos into indirect extent if we are at
 657          * the pointer to it
 658          */
 659         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 660         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 661
 662         /* if the extent is allocated and recorded, return the block
 663            if the extent is not a multiple of the blocksize, round up */
 664
 665         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 666                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 667                         elen = EXT_RECORDED_ALLOCATED |
 668                                 ((elen + inode->i_sb->s_blocksize - 1) &
 669                                  ~(inode->i_sb->s_blocksize - 1));
 670                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 671                 }
 672                 brelse(prev_epos.bh);
 673                 brelse(cur_epos.bh);
 674                 brelse(next_epos.bh);
 675                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 676                 return newblock;
 677         }
 678
 679         /* Are we beyond EOF? */
 680         if (etype == -1) {
 681                 int ret;
 682                 isBeyondEOF = 1;
 683                 if (count) {
 684                         if (c)
 685                                 laarr[0] = laarr[1];
 686                         startnum = 1;
 687                 } else {
 688                         /* Create a fake extent when there's not one */
 689                         memset(&laarr[0].extLocation, 0x00,
 690                                 sizeof(struct kernel_lb_addr));
 691                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 692                         /* Will udf_do_extend_file() create real extent from
 693                            a fake one? */
 694                         startnum = (offset > 0);
 695                 }
 696                 /* Create extents for the hole between EOF and offset */
 697                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 698                 if (ret < 0) {
 699                         brelse(prev_epos.bh);
 700                         brelse(cur_epos.bh);
 701                         brelse(next_epos.bh);
 702                         *err = ret;
 703                         return 0;
 704                 }
 705                 c = 0;
 706                 offset = 0;
 707                 count += ret;
 708                 /* We are not covered by a preallocated extent? */
 709                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 710                                                 EXT_NOT_RECORDED_ALLOCATED) {
 711                         /* Is there any real extent? - otherwise we overwrite
 712                          * the fake one... */
 713                         if (count)
 714                                 c = !c;
 715                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 716                                 inode->i_sb->s_blocksize;
 717                         memset(&laarr[c].extLocation, 0x00,
 718                                 sizeof(struct kernel_lb_addr));
 719                         count++;
 720                 }
 721                 endnum = c + 1;
 722                 lastblock = 1;
 723         } else {
 724                 isBeyondEOF = 0;
 725                 endnum = startnum = ((count > 2) ? 2 : count);
 726
 727                 /* if the current extent is in position 0,
 728                    swap it with the previous */
 729                 if (!c && count != 1) {
 730                         laarr[2] = laarr[0];
 731                         laarr[0] = laarr[1];
 732                         laarr[1] = laarr[2];
 733                         c = 1;
 734                 }
 735
 736                 /* if the current block is located in an extent,
 737                    read the next extent */
 738                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 739                 if (etype != -1) {
 740                         laarr[c + 1].extLength = (etype << 30) | elen;
 741                         laarr[c + 1].extLocation = eloc;
 742                         count++;
 743                         startnum++;
 744                         endnum++;
 745                 } else
 746                         lastblock = 1;
 747         }
 748
 749         /* if the current extent is not recorded but allocated, get the
 750          * block in the extent corresponding to the requested block */
 751         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 752                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 753         else { /* otherwise, allocate a new block */
 754                 if (iinfo->i_next_alloc_block == block)
 755                         goal = iinfo->i_next_alloc_goal;
 756
 757                 if (!goal) {
 758                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 759                                 goal = iinfo->i_location.logicalBlockNum + 1;
 760                 }
 761
 762                 newblocknum = udf_new_block(inode->i_sb, inode,
 763                                 iinfo->i_location.partitionReferenceNum,
 764                                 goal, err);
 765                 if (!newblocknum) {
 766                         brelse(prev_epos.bh);
 767                         brelse(cur_epos.bh);
 768                         brelse(next_epos.bh);
 769                         *err = -ENOSPC;
 770                         return 0;
 771                 }
 772                 if (isBeyondEOF)
 773                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 774         }
 775
 776         /* if the extent the requsted block is located in contains multiple
 777          * blocks, split the extent into at most three extents. blocks prior
 778          * to requested block, requested block, and blocks after requested
 779          * block */
 780         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 781
 782 #ifdef UDF_PREALLOCATE
 783         /* We preallocate blocks only for regular files. It also makes sense
 784          * for directories but there's a problem when to drop the
 785          * preallocation. We might use some delayed work for that but I feel
 786          * it's overengineering for a filesystem like UDF. */
 787         if (S_ISREG(inode->i_mode))
 788                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 789 #endif
 790
 791         /* merge any continuous blocks in laarr */
 792         udf_merge_extents(inode, laarr, &endnum);
 793
 794         /* write back the new extents, inserting new extents if the new number
 795          * of extents is greater than the old number, and deleting extents if
 796          * the new number of extents is less than the old number */
 797         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 798
 799         brelse(prev_epos.bh);
 800         brelse(cur_epos.bh);
 801         brelse(next_epos.bh);
 802
 803         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 804                                 iinfo->i_location.partitionReferenceNum, 0);
 805         if (!newblock) {
 806                 *err = -EIO;
 807                 return 0;
 808         }
 809         *new = 1;
 810         iinfo->i_next_alloc_block = block;
 811         iinfo->i_next_alloc_goal = newblocknum;
 812         inode->i_ctime = current_fs_time(inode->i_sb);
 813
 814         if (IS_SYNC(inode))
 815                 udf_sync_inode(inode);
 816         else
 817                 mark_inode_dirty(inode);
 818
 819         return newblock;
 820 }
 821
 822 static void udf_split_extents(struct inode *inode, int *c, int offset,
 823                               int newblocknum,
 824                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 825                               int *endnum)
 826 {
 827         unsigned long blocksize = inode->i_sb->s_blocksize;
 828         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 829
 830         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 831             (laarr[*c].extLength >> 30) ==
 832                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 833                 int curr = *c;
 834                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 835                             blocksize - 1) >> blocksize_bits;
 836                 int8_t etype = (laarr[curr].extLength >> 30);
 837
 838                 if (blen == 1)
 839                         ;
 840                 else if (!offset || blen == offset + 1) {
 841                         laarr[curr + 2] = laarr[curr + 1];
 842                         laarr[curr + 1] = laarr[curr];
 843                 } else {
 844                         laarr[curr + 3] = laarr[curr + 1];
 845                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 846                 }
 847
 848                 if (offset) {
 849                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 850                                 udf_free_blocks(inode->i_sb, inode,
 851                                                 &laarr[curr].extLocation,
 852                                                 0, offset);
 853                                 laarr[curr].extLength =
 854                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 855                                         (offset << blocksize_bits);
 856                                 laarr[curr].extLocation.logicalBlockNum = 0;
 857                                 laarr[curr].extLocation.
 858                                                 partitionReferenceNum = 0;
 859                         } else
 860                                 laarr[curr].extLength = (etype << 30) |
 861                                         (offset << blocksize_bits);
 862                         curr++;
 863                         (*c)++;
 864                         (*endnum)++;
 865                 }
 866
 867                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 868                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 869                         laarr[curr].extLocation.partitionReferenceNum =
 870                                 UDF_I(inode)->i_location.partitionReferenceNum;
 871                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 872                         blocksize;
 873                 curr++;
 874
 875                 if (blen != offset + 1) {
 876                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 877                                 laarr[curr].extLocation.logicalBlockNum +=
 878                                                                 offset + 1;
 879                         laarr[curr].extLength = (etype << 30) |
 880                                 ((blen - (offset + 1)) << blocksize_bits);
 881                         curr++;
 882                         (*endnum)++;
 883                 }
 884         }
 885 }
 886
 887 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 888                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 889                                  int *endnum)
 890 {
 891         int start, length = 0, currlength = 0, i;
 892
 893         if (*endnum >= (c + 1)) {
 894                 if (!lastblock)
 895                         return;
 896                 else
 897                         start = c;
 898         } else {
 899                 if ((laarr[c + 1].extLength >> 30) ==
 900                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 901                         start = c + 1;
 902                         length = currlength =
 903                                 (((laarr[c + 1].extLength &
 904                                         UDF_EXTENT_LENGTH_MASK) +
 905                                 inode->i_sb->s_blocksize - 1) >>
 906                                 inode->i_sb->s_blocksize_bits);
 907                 } else
 908                         start = c;
 909         }
 910
 911         for (i = start + 1; i <= *endnum; i++) {
 912                 if (i == *endnum) {
 913                         if (lastblock)
 914                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 915                 } else if ((laarr[i].extLength >> 30) ==
 916                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 917                         length += (((laarr[i].extLength &
 918                                                 UDF_EXTENT_LENGTH_MASK) +
 919                                     inode->i_sb->s_blocksize - 1) >>
 920                                     inode->i_sb->s_blocksize_bits);
 921                 } else
 922                         break;
 923         }
 924
 925         if (length) {
 926                 int next = laarr[start].extLocation.logicalBlockNum +
 927                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 928                           inode->i_sb->s_blocksize - 1) >>
 929                           inode->i_sb->s_blocksize_bits);
 930                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 931                                 laarr[start].extLocation.partitionReferenceNum,
 932                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 933                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 934                                 currlength);
 935                 if (numalloc)   {
 936                         if (start == (c + 1))
 937                                 laarr[start].extLength +=
 938                                         (numalloc <<
 939                                          inode->i_sb->s_blocksize_bits);
 940                         else {
 941                                 memmove(&laarr[c + 2], &laarr[c + 1],
 942                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 943                                 (*endnum)++;
 944                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 945                                 laarr[c + 1].extLocation.partitionReferenceNum =
 946                                         laarr[c].extLocation.
 947                                                         partitionReferenceNum;
 948                                 laarr[c + 1].extLength =
 949                                         EXT_NOT_RECORDED_ALLOCATED |
 950                                         (numalloc <<
 951                                          inode->i_sb->s_blocksize_bits);
 952                                 start = c + 1;
 953                         }
 954
 955                         for (i = start + 1; numalloc && i < *endnum; i++) {
 956                                 int elen = ((laarr[i].extLength &
 957                                                 UDF_EXTENT_LENGTH_MASK) +
 958                                             inode->i_sb->s_blocksize - 1) >>
 959                                             inode->i_sb->s_blocksize_bits;
 960
 961                                 if (elen > numalloc) {
 962                                         laarr[i].extLength -=
 963                                                 (numalloc <<
 964                                                  inode->i_sb->s_blocksize_bits);
 965                                         numalloc = 0;
 966                                 } else {
 967                                         numalloc -= elen;
 968                                         if (*endnum > (i + 1))
 969                                                 memmove(&laarr[i],
 970                                                         &laarr[i + 1],
 971                                                         sizeof(struct long_ad) *
 972                                                         (*endnum - (i + 1)));
 973                                         i--;
 974                                         (*endnum)--;
 975                                 }
 976                         }
 977                         UDF_I(inode)->i_lenExtents +=
 978                                 numalloc << inode->i_sb->s_blocksize_bits;
 979                 }
 980         }
 981 }
 982
 983 static void udf_merge_extents(struct inode *inode,
 984                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 985                               int *endnum)
 986 {
 987         int i;
 988         unsigned long blocksize = inode->i_sb->s_blocksize;
 989         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 990
 991         for (i = 0; i < (*endnum - 1); i++) {
 992                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 993                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 994
 995                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 996                         (((li->extLength >> 30) ==
 997                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 998                         ((lip1->extLocation.logicalBlockNum -
 999                           li->extLocation.logicalBlockNum) ==
1000                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1001                         blocksize - 1) >> blocksize_bits)))) {
1002
1003                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1004                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1005                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1006                                 lip1->extLength = (lip1->extLength -
1007                                                   (li->extLength &
1008                                                    UDF_EXTENT_LENGTH_MASK) +
1009                                                    UDF_EXTENT_LENGTH_MASK) &
1010                                                         ~(blocksize - 1);
1011                                 li->extLength = (li->extLength &
1012                                                  UDF_EXTENT_FLAG_MASK) +
1013                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1014                                                 blocksize;
1015                                 lip1->extLocation.logicalBlockNum =
1016                                         li->extLocation.logicalBlockNum +
1017                                         ((li->extLength &
1018                                                 UDF_EXTENT_LENGTH_MASK) >>
1019                                                 blocksize_bits);
1020                         } else {
1021                                 li->extLength = lip1->extLength +
1022                                         (((li->extLength &
1023                                                 UDF_EXTENT_LENGTH_MASK) +
1024                                          blocksize - 1) & ~(blocksize - 1));
1025                                 if (*endnum > (i + 2))
1026                                         memmove(&laarr[i + 1], &laarr[i + 2],
1027                                                 sizeof(struct long_ad) *
1028                                                 (*endnum - (i + 2)));
1029                                 i--;
1030                                 (*endnum)--;
1031                         }
1032                 } else if (((li->extLength >> 30) ==
1033                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1034                            ((lip1->extLength >> 30) ==
1035                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1036                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1037                                         ((li->extLength &
1038                                           UDF_EXTENT_LENGTH_MASK) +
1039                                          blocksize - 1) >> blocksize_bits);
1040                         li->extLocation.logicalBlockNum = 0;
1041                         li->extLocation.partitionReferenceNum = 0;
1042
1043                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1044                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1045                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1046                                 lip1->extLength = (lip1->extLength -
1047                                                    (li->extLength &
1048                                                    UDF_EXTENT_LENGTH_MASK) +
1049                                                    UDF_EXTENT_LENGTH_MASK) &
1050                                                    ~(blocksize - 1);
1051                                 li->extLength = (li->extLength &
1052                                                  UDF_EXTENT_FLAG_MASK) +
1053                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1054                                                 blocksize;
1055                         } else {
1056                                 li->extLength = lip1->extLength +
1057                                         (((li->extLength &
1058                                                 UDF_EXTENT_LENGTH_MASK) +
1059                                           blocksize - 1) & ~(blocksize - 1));
1060                                 if (*endnum > (i + 2))
1061                                         memmove(&laarr[i + 1], &laarr[i + 2],
1062                                                 sizeof(struct long_ad) *
1063                                                 (*endnum - (i + 2)));
1064                                 i--;
1065                                 (*endnum)--;
1066                         }
1067                 } else if ((li->extLength >> 30) ==
1068                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1069                         udf_free_blocks(inode->i_sb, inode,
1070                                         &li->extLocation, 0,
1071                                         ((li->extLength &
1072                                                 UDF_EXTENT_LENGTH_MASK) +
1073                                          blocksize - 1) >> blocksize_bits);
1074                         li->extLocation.logicalBlockNum = 0;
1075                         li->extLocation.partitionReferenceNum = 0;
1076                         li->extLength = (li->extLength &
1077                                                 UDF_EXTENT_LENGTH_MASK) |
1078                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1079                 }
1080         }
1081 }
1082
1083 static void udf_update_extents(struct inode *inode,
1084                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1085                                int startnum, int endnum,
1086                                struct extent_position *epos)
1087 {
1088         int start = 0, i;
1089         struct kernel_lb_addr tmploc;
1090         uint32_t tmplen;
1091
1092         if (startnum > endnum) {
1093                 for (i = 0; i < (startnum - endnum); i++)
1094                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1095                                         laarr[i].extLength);
1096         } else if (startnum < endnum) {
1097                 for (i = 0; i < (endnum - startnum); i++) {
1098                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1099                                         laarr[i].extLength);
1100                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1101                                       &laarr[i].extLength, 1);
1102                         start++;
1103                 }
1104         }
1105
1106         for (i = start; i < endnum; i++) {
1107                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1108                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1109                                laarr[i].extLength, 1);
1110         }
1111 }
1112
1113 struct buffer_head *udf_bread(struct inode *inode, int block,
1114                               int create, int *err)
1115 {
1116         struct buffer_head *bh = NULL;
1117
1118         bh = udf_getblk(inode, block, create, err);
1119         if (!bh)
1120                 return NULL;
1121
1122         if (buffer_uptodate(bh))
1123                 return bh;
1124
1125         ll_rw_block(READ, 1, &bh);
1126
1127         wait_on_buffer(bh);
1128         if (buffer_uptodate(bh))
1129                 return bh;
1130
1131         brelse(bh);
1132         *err = -EIO;
1133         return NULL;
1134 }
1135
1136 int udf_setsize(struct inode *inode, loff_t newsize)
1137 {
1138         int err;
1139         struct udf_inode_info *iinfo;
1140         int bsize = 1 << inode->i_blkbits;
1141
1142         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1143               S_ISLNK(inode->i_mode)))
1144                 return -EINVAL;
1145         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1146                 return -EPERM;
1147
1148         iinfo = UDF_I(inode);
1149         if (newsize > inode->i_size) {
1150                 down_write(&iinfo->i_data_sem);
1151                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1152                         if (bsize <
1153                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1154                                 err = udf_expand_file_adinicb(inode);
1155                                 if (err)
1156                                         return err;
1157                                 down_write(&iinfo->i_data_sem);
1158                         } else {
1159                                 iinfo->i_lenAlloc = newsize;
1160                                 goto set_size;
1161                         }
1162                 }
1163                 err = udf_extend_file(inode, newsize);
1164                 if (err) {
1165                         up_write(&iinfo->i_data_sem);
1166                         return err;
1167                 }
1168 set_size:
1169                 truncate_setsize(inode, newsize);
1170                 up_write(&iinfo->i_data_sem);
1171         } else {
1172                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1173                         down_write(&iinfo->i_data_sem);
1174                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1175                                0x00, bsize - newsize -
1176                                udf_file_entry_alloc_offset(inode));
1177                         iinfo->i_lenAlloc = newsize;
1178                         truncate_setsize(inode, newsize);
1179                         up_write(&iinfo->i_data_sem);
1180                         goto update_time;
1181                 }
1182                 err = block_truncate_page(inode->i_mapping, newsize,
1183                                           udf_get_block);
1184                 if (err)
1185                         return err;
1186                 down_write(&iinfo->i_data_sem);
1187                 truncate_setsize(inode, newsize);
1188                 udf_truncate_extents(inode);
1189                 up_write(&iinfo->i_data_sem);
1190         }
1191 update_time:
1192         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1193         if (IS_SYNC(inode))
1194                 udf_sync_inode(inode);
1195         else
1196                 mark_inode_dirty(inode);
1197         return 0;
1198 }
1199
1200 static void __udf_read_inode(struct inode *inode)
1201 {
1202         struct buffer_head *bh = NULL;
1203         struct fileEntry *fe;
1204         uint16_t ident;
1205         struct udf_inode_info *iinfo = UDF_I(inode);
1206
1207         /*
1208          * Set defaults, but the inode is still incomplete!
1209          * Note: get_new_inode() sets the following on a new inode:
1210          *      i_sb = sb
1211          *      i_no = ino
1212          *      i_flags = sb->s_flags
1213          *      i_state = 0
1214          * clean_inode(): zero fills and sets
1215          *      i_count = 1
1216          *      i_nlink = 1
1217          *      i_op = NULL;
1218          */
1219         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1220         if (!bh) {
1221                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1222                 make_bad_inode(inode);
1223                 return;
1224         }
1225
1226         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1227             ident != TAG_IDENT_USE) {
1228                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1229                         inode->i_ino, ident);
1230                 brelse(bh);
1231                 make_bad_inode(inode);
1232                 return;
1233         }
1234
1235         fe = (struct fileEntry *)bh->b_data;
1236
1237         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1238                 struct buffer_head *ibh;
1239
1240                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1241                                         &ident);
1242                 if (ident == TAG_IDENT_IE && ibh) {
1243                         struct buffer_head *nbh = NULL;
1244                         struct kernel_lb_addr loc;
1245                         struct indirectEntry *ie;
1246
1247                         ie = (struct indirectEntry *)ibh->b_data;
1248                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1249
1250                         if (ie->indirectICB.extLength &&
1251                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1252                                                         &ident))) {
1253                                 if (ident == TAG_IDENT_FE ||
1254                                         ident == TAG_IDENT_EFE) {
1255                                         memcpy(&iinfo->i_location,
1256                                                 &loc,
1257                                                 sizeof(struct kernel_lb_addr));
1258                                         brelse(bh);
1259                                         brelse(ibh);
1260                                         brelse(nbh);
1261                                         __udf_read_inode(inode);
1262                                         return;
1263                                 }
1264                                 brelse(nbh);
1265                         }
1266                 }
1267                 brelse(ibh);
1268         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1269                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1270                         le16_to_cpu(fe->icbTag.strategyType));
1271                 brelse(bh);
1272                 make_bad_inode(inode);
1273                 return;
1274         }
1275         udf_fill_inode(inode, bh);
1276
1277         brelse(bh);
1278 }
1279
1280 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1281 {
1282         struct fileEntry *fe;
1283         struct extendedFileEntry *efe;
1284         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1285         struct udf_inode_info *iinfo = UDF_I(inode);
1286         unsigned int link_count;
1287
1288         fe = (struct fileEntry *)bh->b_data;
1289         efe = (struct extendedFileEntry *)bh->b_data;
1290
1291         if (fe->icbTag.strategyType == cpu_to_le16(4))
1292                 iinfo->i_strat4096 = 0;
1293         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1294                 iinfo->i_strat4096 = 1;
1295
1296         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1297                                                         ICBTAG_FLAG_AD_MASK;
1298         iinfo->i_unique = 0;
1299         iinfo->i_lenEAttr = 0;
1300         iinfo->i_lenExtents = 0;
1301         iinfo->i_lenAlloc = 0;
1302         iinfo->i_next_alloc_block = 0;
1303         iinfo->i_next_alloc_goal = 0;
1304         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1305                 iinfo->i_efe = 1;
1306                 iinfo->i_use = 0;
1307                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1308                                         sizeof(struct extendedFileEntry))) {
1309                         make_bad_inode(inode);
1310                         return;
1311                 }
1312                 memcpy(iinfo->i_ext.i_data,
1313                        bh->b_data + sizeof(struct extendedFileEntry),
1314                        inode->i_sb->s_blocksize -
1315                                         sizeof(struct extendedFileEntry));
1316         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1317                 iinfo->i_efe = 0;
1318                 iinfo->i_use = 0;
1319                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1320                                                 sizeof(struct fileEntry))) {
1321                         make_bad_inode(inode);
1322                         return;
1323                 }
1324                 memcpy(iinfo->i_ext.i_data,
1325                        bh->b_data + sizeof(struct fileEntry),
1326                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1327         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1328                 iinfo->i_efe = 0;
1329                 iinfo->i_use = 1;
1330                 iinfo->i_lenAlloc = le32_to_cpu(
1331                                 ((struct unallocSpaceEntry *)bh->b_data)->
1332                                  lengthAllocDescs);
1333                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1334                                         sizeof(struct unallocSpaceEntry))) {
1335                         make_bad_inode(inode);
1336                         return;
1337                 }
1338                 memcpy(iinfo->i_ext.i_data,
1339                        bh->b_data + sizeof(struct unallocSpaceEntry),
1340                        inode->i_sb->s_blocksize -
1341                                         sizeof(struct unallocSpaceEntry));
1342                 return;
1343         }
1344
1345         read_lock(&sbi->s_cred_lock);
1346         i_uid_write(inode, le32_to_cpu(fe->uid));
1347         if (!uid_valid(inode->i_uid) ||
1348             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1349             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1350                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1351
1352         i_gid_write(inode, le32_to_cpu(fe->gid));
1353         if (!gid_valid(inode->i_gid) ||
1354             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1355             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1356                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1357
1358         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1359                         sbi->s_fmode != UDF_INVALID_MODE)
1360                 inode->i_mode = sbi->s_fmode;
1361         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1362                         sbi->s_dmode != UDF_INVALID_MODE)
1363                 inode->i_mode = sbi->s_dmode;
1364         else
1365                 inode->i_mode = udf_convert_permissions(fe);
1366         inode->i_mode &= ~sbi->s_umask;
1367         read_unlock(&sbi->s_cred_lock);
1368
1369         link_count = le16_to_cpu(fe->fileLinkCount);
1370         if (!link_count)
1371                 link_count = 1;
1372         set_nlink(inode, link_count);
1373
1374         inode->i_size = le64_to_cpu(fe->informationLength);
1375         iinfo->i_lenExtents = inode->i_size;
1376
1377         if (iinfo->i_efe == 0) {
1378                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1379                         (inode->i_sb->s_blocksize_bits - 9);
1380
1381                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1382                         inode->i_atime = sbi->s_record_time;
1383
1384                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1385                                             fe->modificationTime))
1386                         inode->i_mtime = sbi->s_record_time;
1387
1388                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1389                         inode->i_ctime = sbi->s_record_time;
1390
1391                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1392                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1393                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1394                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1395         } else {
1396                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1397                     (inode->i_sb->s_blocksize_bits - 9);
1398
1399                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1400                         inode->i_atime = sbi->s_record_time;
1401
1402                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1403                                             efe->modificationTime))
1404                         inode->i_mtime = sbi->s_record_time;
1405
1406                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1407                         iinfo->i_crtime = sbi->s_record_time;
1408
1409                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1410                         inode->i_ctime = sbi->s_record_time;
1411
1412                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1413                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1414                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1415                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1416         }
1417
1418         switch (fe->icbTag.fileType) {
1419         case ICBTAG_FILE_TYPE_DIRECTORY:
1420                 inode->i_op = &udf_dir_inode_operations;
1421                 inode->i_fop = &udf_dir_operations;
1422                 inode->i_mode |= S_IFDIR;
1423                 inc_nlink(inode);
1424                 break;
1425         case ICBTAG_FILE_TYPE_REALTIME:
1426         case ICBTAG_FILE_TYPE_REGULAR:
1427         case ICBTAG_FILE_TYPE_UNDEF:
1428         case ICBTAG_FILE_TYPE_VAT20:
1429                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1430                         inode->i_data.a_ops = &udf_adinicb_aops;
1431                 else
1432                         inode->i_data.a_ops = &udf_aops;
1433                 inode->i_op = &udf_file_inode_operations;
1434                 inode->i_fop = &udf_file_operations;
1435                 inode->i_mode |= S_IFREG;
1436                 break;
1437         case ICBTAG_FILE_TYPE_BLOCK:
1438                 inode->i_mode |= S_IFBLK;
1439                 break;
1440         case ICBTAG_FILE_TYPE_CHAR:
1441                 inode->i_mode |= S_IFCHR;
1442                 break;
1443         case ICBTAG_FILE_TYPE_FIFO:
1444                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1445                 break;
1446         case ICBTAG_FILE_TYPE_SOCKET:
1447                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1448                 break;
1449         case ICBTAG_FILE_TYPE_SYMLINK:
1450                 inode->i_data.a_ops = &udf_symlink_aops;
1451                 inode->i_op = &udf_symlink_inode_operations;
1452                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1453                 break;
1454         case ICBTAG_FILE_TYPE_MAIN:
1455                 udf_debug("METADATA FILE-----\n");
1456                 break;
1457         case ICBTAG_FILE_TYPE_MIRROR:
1458                 udf_debug("METADATA MIRROR FILE-----\n");
1459                 break;
1460         case ICBTAG_FILE_TYPE_BITMAP:
1461                 udf_debug("METADATA BITMAP FILE-----\n");
1462                 break;
1463         default:
1464                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1465                         inode->i_ino, fe->icbTag.fileType);
1466                 make_bad_inode(inode);
1467                 return;
1468         }
1469         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1470                 struct deviceSpec *dsea =
1471                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1472                 if (dsea) {
1473                         init_special_inode(inode, inode->i_mode,
1474                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1475                                       le32_to_cpu(dsea->minorDeviceIdent)));
1476                         /* Developer ID ??? */
1477                 } else
1478                         make_bad_inode(inode);
1479         }
1480 }
1481
1482 static int udf_alloc_i_data(struct inode *inode, size_t size)
1483 {
1484         struct udf_inode_info *iinfo = UDF_I(inode);
1485         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1486
1487         if (!iinfo->i_ext.i_data) {
1488                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1489                         inode->i_ino);
1490                 return -ENOMEM;
1491         }
1492
1493         return 0;
1494 }
1495
1496 static umode_t udf_convert_permissions(struct fileEntry *fe)
1497 {
1498         umode_t mode;
1499         uint32_t permissions;
1500         uint32_t flags;
1501
1502         permissions = le32_to_cpu(fe->permissions);
1503         flags = le16_to_cpu(fe->icbTag.flags);
1504
1505         mode =  ((permissions) & S_IRWXO) |
1506                 ((permissions >> 2) & S_IRWXG) |
1507                 ((permissions >> 4) & S_IRWXU) |
1508                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1509                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1510                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1511
1512         return mode;
1513 }
1514
1515 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1516 {
1517         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1518 }
1519
1520 static int udf_sync_inode(struct inode *inode)
1521 {
1522         return udf_update_inode(inode, 1);
1523 }
1524
1525 static int udf_update_inode(struct inode *inode, int do_sync)
1526 {
1527         struct buffer_head *bh = NULL;
1528         struct fileEntry *fe;
1529         struct extendedFileEntry *efe;
1530         uint64_t lb_recorded;
1531         uint32_t udfperms;
1532         uint16_t icbflags;
1533         uint16_t crclen;
1534         int err = 0;
1535         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1536         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1537         struct udf_inode_info *iinfo = UDF_I(inode);
1538
1539         bh = udf_tgetblk(inode->i_sb,
1540                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1541         if (!bh) {
1542                 udf_debug("getblk failure\n");
1543                 return -ENOMEM;
1544         }
1545
1546         lock_buffer(bh);
1547         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1548         fe = (struct fileEntry *)bh->b_data;
1549         efe = (struct extendedFileEntry *)bh->b_data;
1550
1551         if (iinfo->i_use) {
1552                 struct unallocSpaceEntry *use =
1553                         (struct unallocSpaceEntry *)bh->b_data;
1554
1555                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1556                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1557                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1558                                         sizeof(struct unallocSpaceEntry));
1559                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1560                 use->descTag.tagLocation =
1561                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1562                 crclen = sizeof(struct unallocSpaceEntry) +
1563                                 iinfo->i_lenAlloc - sizeof(struct tag);
1564                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1565                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1566                                                            sizeof(struct tag),
1567                                                            crclen));
1568                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1569
1570                 goto out;
1571         }
1572
1573         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1574                 fe->uid = cpu_to_le32(-1);
1575         else
1576                 fe->uid = cpu_to_le32(i_uid_read(inode));
1577
1578         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1579                 fe->gid = cpu_to_le32(-1);
1580         else
1581                 fe->gid = cpu_to_le32(i_gid_read(inode));
1582
1583         udfperms = ((inode->i_mode & S_IRWXO)) |
1584                    ((inode->i_mode & S_IRWXG) << 2) |
1585                    ((inode->i_mode & S_IRWXU) << 4);
1586
1587         udfperms |= (le32_to_cpu(fe->permissions) &
1588                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1589                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1590                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1591         fe->permissions = cpu_to_le32(udfperms);
1592
1593         if (S_ISDIR(inode->i_mode))
1594                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1595         else
1596                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1597
1598         fe->informationLength = cpu_to_le64(inode->i_size);
1599
1600         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1601                 struct regid *eid;
1602                 struct deviceSpec *dsea =
1603                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1604                 if (!dsea) {
1605                         dsea = (struct deviceSpec *)
1606                                 udf_add_extendedattr(inode,
1607                                                      sizeof(struct deviceSpec) +
1608                                                      sizeof(struct regid), 12, 0x3);
1609                         dsea->attrType = cpu_to_le32(12);
1610                         dsea->attrSubtype = 1;
1611                         dsea->attrLength = cpu_to_le32(
1612                                                 sizeof(struct deviceSpec) +
1613                                                 sizeof(struct regid));
1614                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1615                 }
1616                 eid = (struct regid *)dsea->impUse;
1617                 memset(eid, 0, sizeof(struct regid));
1618                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1619                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1620                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1621                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1622                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1623         }
1624
1625         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1626                 lb_recorded = 0; /* No extents => no blocks! */
1627         else
1628                 lb_recorded =
1629                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1630                         (blocksize_bits - 9);
1631
1632         if (iinfo->i_efe == 0) {
1633                 memcpy(bh->b_data + sizeof(struct fileEntry),
1634                        iinfo->i_ext.i_data,
1635                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1636                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1637
1638                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1639                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1640                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1641                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1642                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1643                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1644                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1645                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1646                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1647                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1648                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1649                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1650                 crclen = sizeof(struct fileEntry);
1651         } else {
1652                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1653                        iinfo->i_ext.i_data,
1654                        inode->i_sb->s_blocksize -
1655                                         sizeof(struct extendedFileEntry));
1656                 efe->objectSize = cpu_to_le64(inode->i_size);
1657                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1658
1659                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1660                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1661                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1662                         iinfo->i_crtime = inode->i_atime;
1663
1664                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1665                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1666                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1667                         iinfo->i_crtime = inode->i_mtime;
1668
1669                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1670                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1671                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1672                         iinfo->i_crtime = inode->i_ctime;
1673
1674                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1675                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1676                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1677                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1678
1679                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1680                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1681                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1682                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1683                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1684                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1685                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1686                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1687                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1688                 crclen = sizeof(struct extendedFileEntry);
1689         }
1690         if (iinfo->i_strat4096) {
1691                 fe->icbTag.strategyType = cpu_to_le16(4096);
1692                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1693                 fe->icbTag.numEntries = cpu_to_le16(2);
1694         } else {
1695                 fe->icbTag.strategyType = cpu_to_le16(4);
1696                 fe->icbTag.numEntries = cpu_to_le16(1);
1697         }
1698
1699         if (S_ISDIR(inode->i_mode))
1700                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1701         else if (S_ISREG(inode->i_mode))
1702                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1703         else if (S_ISLNK(inode->i_mode))
1704                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1705         else if (S_ISBLK(inode->i_mode))
1706                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1707         else if (S_ISCHR(inode->i_mode))
1708                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1709         else if (S_ISFIFO(inode->i_mode))
1710                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1711         else if (S_ISSOCK(inode->i_mode))
1712                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1713
1714         icbflags =      iinfo->i_alloc_type |
1715                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1716                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1717                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1718                         (le16_to_cpu(fe->icbTag.flags) &
1719                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1720                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1721
1722         fe->icbTag.flags = cpu_to_le16(icbflags);
1723         if (sbi->s_udfrev >= 0x0200)
1724                 fe->descTag.descVersion = cpu_to_le16(3);
1725         else
1726                 fe->descTag.descVersion = cpu_to_le16(2);
1727         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1728         fe->descTag.tagLocation = cpu_to_le32(
1729                                         iinfo->i_location.logicalBlockNum);
1730         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1731         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1732         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1733                                                   crclen));
1734         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1735
1736 out:
1737         set_buffer_uptodate(bh);
1738         unlock_buffer(bh);
1739
1740         /* write the data blocks */
1741         mark_buffer_dirty(bh);
1742         if (do_sync) {
1743                 sync_dirty_buffer(bh);
1744                 if (buffer_write_io_error(bh)) {
1745                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1746                                  inode->i_ino);
1747                         err = -EIO;
1748                 }
1749         }
1750         brelse(bh);
1751
1752         return err;
1753 }
1754
1755 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1756 {
1757         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1758         struct inode *inode = iget_locked(sb, block);
1759
1760         if (!inode)
1761                 return NULL;
1762
1763         if (inode->i_state & I_NEW) {
1764                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1765                 __udf_read_inode(inode);
1766                 unlock_new_inode(inode);
1767         }
1768
1769         if (is_bad_inode(inode))
1770                 goto out_iput;
1771
1772         if (ino->logicalBlockNum >= UDF_SB(sb)->
1773                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1774                 udf_debug("block=%d, partition=%d out of range\n",
1775                           ino->logicalBlockNum, ino->partitionReferenceNum);
1776                 make_bad_inode(inode);
1777                 goto out_iput;
1778         }
1779
1780         return inode;
1781
1782  out_iput:
1783         iput(inode);
1784         return NULL;
1785 }
1786
1787 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1788                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1789 {
1790         int adsize;
1791         struct short_ad *sad = NULL;
1792         struct long_ad *lad = NULL;
1793         struct allocExtDesc *aed;
1794         uint8_t *ptr;
1795         struct udf_inode_info *iinfo = UDF_I(inode);
1796
1797         if (!epos->bh)
1798                 ptr = iinfo->i_ext.i_data + epos->offset -
1799                         udf_file_entry_alloc_offset(inode) +
1800                         iinfo->i_lenEAttr;
1801         else
1802                 ptr = epos->bh->b_data + epos->offset;
1803
1804         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1805                 adsize = sizeof(struct short_ad);
1806         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1807                 adsize = sizeof(struct long_ad);
1808         else
1809                 return -EIO;
1810
1811         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1812                 unsigned char *sptr, *dptr;
1813                 struct buffer_head *nbh;
1814                 int err, loffset;
1815                 struct kernel_lb_addr obloc = epos->block;
1816
1817                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1818                                                 obloc.partitionReferenceNum,
1819                                                 obloc.logicalBlockNum, &err);
1820                 if (!epos->block.logicalBlockNum)
1821                         return -ENOSPC;
1822                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1823                                                                  &epos->block,
1824                                                                  0));
1825                 if (!nbh)
1826                         return -EIO;
1827                 lock_buffer(nbh);
1828                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1829                 set_buffer_uptodate(nbh);
1830                 unlock_buffer(nbh);
1831                 mark_buffer_dirty_inode(nbh, inode);
1832
1833                 aed = (struct allocExtDesc *)(nbh->b_data);
1834                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1835                         aed->previousAllocExtLocation =
1836                                         cpu_to_le32(obloc.logicalBlockNum);
1837                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1838                         loffset = epos->offset;
1839                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1840                         sptr = ptr - adsize;
1841                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1842                         memcpy(dptr, sptr, adsize);
1843                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1844                 } else {
1845                         loffset = epos->offset + adsize;
1846                         aed->lengthAllocDescs = cpu_to_le32(0);
1847                         sptr = ptr;
1848                         epos->offset = sizeof(struct allocExtDesc);
1849
1850                         if (epos->bh) {
1851                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1852                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1853                         } else {
1854                                 iinfo->i_lenAlloc += adsize;
1855                                 mark_inode_dirty(inode);
1856                         }
1857                 }
1858                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1859                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1860                                     epos->block.logicalBlockNum, sizeof(struct tag));
1861                 else
1862                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1863                                     epos->block.logicalBlockNum, sizeof(struct tag));
1864                 switch (iinfo->i_alloc_type) {
1865                 case ICBTAG_FLAG_AD_SHORT:
1866                         sad = (struct short_ad *)sptr;
1867                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1868                                                      inode->i_sb->s_blocksize);
1869                         sad->extPosition =
1870                                 cpu_to_le32(epos->block.logicalBlockNum);
1871                         break;
1872                 case ICBTAG_FLAG_AD_LONG:
1873                         lad = (struct long_ad *)sptr;
1874                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1875                                                      inode->i_sb->s_blocksize);
1876                         lad->extLocation = cpu_to_lelb(epos->block);
1877                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1878                         break;
1879                 }
1880                 if (epos->bh) {
1881                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1882                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1883                                 udf_update_tag(epos->bh->b_data, loffset);
1884                         else
1885                                 udf_update_tag(epos->bh->b_data,
1886                                                 sizeof(struct allocExtDesc));
1887                         mark_buffer_dirty_inode(epos->bh, inode);
1888                         brelse(epos->bh);
1889                 } else {
1890                         mark_inode_dirty(inode);
1891                 }
1892                 epos->bh = nbh;
1893         }
1894
1895         udf_write_aext(inode, epos, eloc, elen, inc);
1896
1897         if (!epos->bh) {
1898                 iinfo->i_lenAlloc += adsize;
1899                 mark_inode_dirty(inode);
1900         } else {
1901                 aed = (struct allocExtDesc *)epos->bh->b_data;
1902                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1903                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1904                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1905                         udf_update_tag(epos->bh->b_data,
1906                                         epos->offset + (inc ? 0 : adsize));
1907                 else
1908                         udf_update_tag(epos->bh->b_data,
1909                                         sizeof(struct allocExtDesc));
1910                 mark_buffer_dirty_inode(epos->bh, inode);
1911         }
1912
1913         return 0;
1914 }
1915
1916 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1917                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1918 {
1919         int adsize;
1920         uint8_t *ptr;
1921         struct short_ad *sad;
1922         struct long_ad *lad;
1923         struct udf_inode_info *iinfo = UDF_I(inode);
1924
1925         if (!epos->bh)
1926                 ptr = iinfo->i_ext.i_data + epos->offset -
1927                         udf_file_entry_alloc_offset(inode) +
1928                         iinfo->i_lenEAttr;
1929         else
1930                 ptr = epos->bh->b_data + epos->offset;
1931
1932         switch (iinfo->i_alloc_type) {
1933         case ICBTAG_FLAG_AD_SHORT:
1934                 sad = (struct short_ad *)ptr;
1935                 sad->extLength = cpu_to_le32(elen);
1936                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1937                 adsize = sizeof(struct short_ad);
1938                 break;
1939         case ICBTAG_FLAG_AD_LONG:
1940                 lad = (struct long_ad *)ptr;
1941                 lad->extLength = cpu_to_le32(elen);
1942                 lad->extLocation = cpu_to_lelb(*eloc);
1943                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1944                 adsize = sizeof(struct long_ad);
1945                 break;
1946         default:
1947                 return;
1948         }
1949
1950         if (epos->bh) {
1951                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1952                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1953                         struct allocExtDesc *aed =
1954                                 (struct allocExtDesc *)epos->bh->b_data;
1955                         udf_update_tag(epos->bh->b_data,
1956                                        le32_to_cpu(aed->lengthAllocDescs) +
1957                                        sizeof(struct allocExtDesc));
1958                 }
1959                 mark_buffer_dirty_inode(epos->bh, inode);
1960         } else {
1961                 mark_inode_dirty(inode);
1962         }
1963
1964         if (inc)
1965                 epos->offset += adsize;
1966 }
1967
1968 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1969                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1970 {
1971         int8_t etype;
1972
1973         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1974                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1975                 int block;
1976                 epos->block = *eloc;
1977                 epos->offset = sizeof(struct allocExtDesc);
1978                 brelse(epos->bh);
1979                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1980                 epos->bh = udf_tread(inode->i_sb, block);
1981                 if (!epos->bh) {
1982                         udf_debug("reading block %d failed!\n", block);
1983                         return -1;
1984                 }
1985         }
1986
1987         return etype;
1988 }
1989
1990 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1991                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1992 {
1993         int alen;
1994         int8_t etype;
1995         uint8_t *ptr;
1996         struct short_ad *sad;
1997         struct long_ad *lad;
1998         struct udf_inode_info *iinfo = UDF_I(inode);
1999
2000         if (!epos->bh) {
2001                 if (!epos->offset)
2002                         epos->offset = udf_file_entry_alloc_offset(inode);
2003                 ptr = iinfo->i_ext.i_data + epos->offset -
2004                         udf_file_entry_alloc_offset(inode) +
2005                         iinfo->i_lenEAttr;
2006                 alen = udf_file_entry_alloc_offset(inode) +
2007                                                         iinfo->i_lenAlloc;
2008         } else {
2009                 if (!epos->offset)
2010                         epos->offset = sizeof(struct allocExtDesc);
2011                 ptr = epos->bh->b_data + epos->offset;
2012                 alen = sizeof(struct allocExtDesc) +
2013                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2014                                                         lengthAllocDescs);
2015         }
2016
2017         switch (iinfo->i_alloc_type) {
2018         case ICBTAG_FLAG_AD_SHORT:
2019                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2020                 if (!sad)
2021                         return -1;
2022                 etype = le32_to_cpu(sad->extLength) >> 30;
2023                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2024                 eloc->partitionReferenceNum =
2025                                 iinfo->i_location.partitionReferenceNum;
2026                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2027                 break;
2028         case ICBTAG_FLAG_AD_LONG:
2029                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2030                 if (!lad)
2031                         return -1;
2032                 etype = le32_to_cpu(lad->extLength) >> 30;
2033                 *eloc = lelb_to_cpu(lad->extLocation);
2034                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2035                 break;
2036         default:
2037                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2038                 return -1;
2039         }
2040
2041         return etype;
2042 }
2043
2044 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2045                               struct kernel_lb_addr neloc, uint32_t nelen)
2046 {
2047         struct kernel_lb_addr oeloc;
2048         uint32_t oelen;
2049         int8_t etype;
2050
2051         if (epos.bh)
2052                 get_bh(epos.bh);
2053
2054         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2055                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2056                 neloc = oeloc;
2057                 nelen = (etype << 30) | oelen;
2058         }
2059         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2060         brelse(epos.bh);
2061
2062         return (nelen >> 30);
2063 }
2064
2065 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2066                        struct kernel_lb_addr eloc, uint32_t elen)
2067 {
2068         struct extent_position oepos;
2069         int adsize;
2070         int8_t etype;
2071         struct allocExtDesc *aed;
2072         struct udf_inode_info *iinfo;
2073
2074         if (epos.bh) {
2075                 get_bh(epos.bh);
2076                 get_bh(epos.bh);
2077         }
2078
2079         iinfo = UDF_I(inode);
2080         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2081                 adsize = sizeof(struct short_ad);
2082         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2083                 adsize = sizeof(struct long_ad);
2084         else
2085                 adsize = 0;
2086
2087         oepos = epos;
2088         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2089                 return -1;
2090
2091         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2092                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2093                 if (oepos.bh != epos.bh) {
2094                         oepos.block = epos.block;
2095                         brelse(oepos.bh);
2096                         get_bh(epos.bh);
2097                         oepos.bh = epos.bh;
2098                         oepos.offset = epos.offset - adsize;
2099                 }
2100         }
2101         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2102         elen = 0;
2103
2104         if (epos.bh != oepos.bh) {
2105                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2106                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2107                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2108                 if (!oepos.bh) {
2109                         iinfo->i_lenAlloc -= (adsize * 2);
2110                         mark_inode_dirty(inode);
2111                 } else {
2112                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2113                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2114                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2115                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2116                                 udf_update_tag(oepos.bh->b_data,
2117                                                 oepos.offset - (2 * adsize));
2118                         else
2119                                 udf_update_tag(oepos.bh->b_data,
2120                                                 sizeof(struct allocExtDesc));
2121                         mark_buffer_dirty_inode(oepos.bh, inode);
2122                 }
2123         } else {
2124                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2125                 if (!oepos.bh) {
2126                         iinfo->i_lenAlloc -= adsize;
2127                         mark_inode_dirty(inode);
2128                 } else {
2129                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2130                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2131                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2132                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2133                                 udf_update_tag(oepos.bh->b_data,
2134                                                 epos.offset - adsize);
2135                         else
2136                                 udf_update_tag(oepos.bh->b_data,
2137                                                 sizeof(struct allocExtDesc));
2138                         mark_buffer_dirty_inode(oepos.bh, inode);
2139                 }
2140         }
2141
2142         brelse(epos.bh);
2143         brelse(oepos.bh);
2144
2145         return (elen >> 30);
2146 }
2147
2148 int8_t inode_bmap(struct inode *inode, sector_t block,
2149                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2150                   uint32_t *elen, sector_t *offset)
2151 {
2152         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2153         loff_t lbcount = 0, bcount =
2154             (loff_t) block << blocksize_bits;
2155         int8_t etype;
2156         struct udf_inode_info *iinfo;
2157
2158         iinfo = UDF_I(inode);
2159         pos->offset = 0;
2160         pos->block = iinfo->i_location;
2161         pos->bh = NULL;
2162         *elen = 0;
2163
2164         do {
2165                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2166                 if (etype == -1) {
2167                         *offset = (bcount - lbcount) >> blocksize_bits;
2168                         iinfo->i_lenExtents = lbcount;
2169                         return -1;
2170                 }
2171                 lbcount += *elen;
2172         } while (lbcount <= bcount);
2173
2174         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2175
2176         return etype;
2177 }
2178
2179 long udf_block_map(struct inode *inode, sector_t block)
2180 {
2181         struct kernel_lb_addr eloc;
2182         uint32_t elen;
2183         sector_t offset;
2184         struct extent_position epos = {};
2185         int ret;
2186
2187         down_read(&UDF_I(inode)->i_data_sem);
2188
2189         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2190                                                 (EXT_RECORDED_ALLOCATED >> 30))
2191                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2192         else
2193                 ret = 0;
2194
2195         up_read(&UDF_I(inode)->i_data_sem);
2196         brelse(epos.bh);
2197
2198         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2199                 return udf_fixed_to_variable(ret);
2200         else
2201                 return ret;
2202 }