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         static sector_t last_block;
 591         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 592         struct extent_position prev_epos, cur_epos, next_epos;
 593         int count = 0, startnum = 0, endnum = 0;
 594         uint32_t elen = 0, tmpelen;
 595         struct kernel_lb_addr eloc, tmpeloc;
 596         int c = 1;
 597         loff_t lbcount = 0, b_off = 0;
 598         uint32_t newblocknum, newblock;
 599         sector_t offset = 0;
 600         int8_t etype;
 601         struct udf_inode_info *iinfo = UDF_I(inode);
 602         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 603         int lastblock = 0;
 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         last_block = block;
 680         /* Are we beyond EOF? */
 681         if (etype == -1) {
 682                 int ret;
 683
 684                 if (count) {
 685                         if (c)
 686                                 laarr[0] = laarr[1];
 687                         startnum = 1;
 688                 } else {
 689                         /* Create a fake extent when there's not one */
 690                         memset(&laarr[0].extLocation, 0x00,
 691                                 sizeof(struct kernel_lb_addr));
 692                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 693                         /* Will udf_do_extend_file() create real extent from
 694                            a fake one? */
 695                         startnum = (offset > 0);
 696                 }
 697                 /* Create extents for the hole between EOF and offset */
 698                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 699                 if (ret < 0) {
 700                         brelse(prev_epos.bh);
 701                         brelse(cur_epos.bh);
 702                         brelse(next_epos.bh);
 703                         *err = ret;
 704                         return 0;
 705                 }
 706                 c = 0;
 707                 offset = 0;
 708                 count += ret;
 709                 /* We are not covered by a preallocated extent? */
 710                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 711                                                 EXT_NOT_RECORDED_ALLOCATED) {
 712                         /* Is there any real extent? - otherwise we overwrite
 713                          * the fake one... */
 714                         if (count)
 715                                 c = !c;
 716                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 717                                 inode->i_sb->s_blocksize;
 718                         memset(&laarr[c].extLocation, 0x00,
 719                                 sizeof(struct kernel_lb_addr));
 720                         count++;
 721                         endnum++;
 722                 }
 723                 endnum = c + 1;
 724                 lastblock = 1;
 725         } else {
 726                 endnum = startnum = ((count > 2) ? 2 : count);
 727
 728                 /* if the current extent is in position 0,
 729                    swap it with the previous */
 730                 if (!c && count != 1) {
 731                         laarr[2] = laarr[0];
 732                         laarr[0] = laarr[1];
 733                         laarr[1] = laarr[2];
 734                         c = 1;
 735                 }
 736
 737                 /* if the current block is located in an extent,
 738                    read the next extent */
 739                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 740                 if (etype != -1) {
 741                         laarr[c + 1].extLength = (etype << 30) | elen;
 742                         laarr[c + 1].extLocation = eloc;
 743                         count++;
 744                         startnum++;
 745                         endnum++;
 746                 } else
 747                         lastblock = 1;
 748         }
 749
 750         /* if the current extent is not recorded but allocated, get the
 751          * block in the extent corresponding to the requested block */
 752         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 753                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 754         else { /* otherwise, allocate a new block */
 755                 if (iinfo->i_next_alloc_block == block)
 756                         goal = iinfo->i_next_alloc_goal;
 757
 758                 if (!goal) {
 759                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 760                                 goal = iinfo->i_location.logicalBlockNum + 1;
 761                 }
 762
 763                 newblocknum = udf_new_block(inode->i_sb, inode,
 764                                 iinfo->i_location.partitionReferenceNum,
 765                                 goal, err);
 766                 if (!newblocknum) {
 767                         brelse(prev_epos.bh);
 768                         *err = -ENOSPC;
 769                         return 0;
 770                 }
 771                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 772         }
 773
 774         /* if the extent the requsted block is located in contains multiple
 775          * blocks, split the extent into at most three extents. blocks prior
 776          * to requested block, requested block, and blocks after requested
 777          * block */
 778         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 779
 780 #ifdef UDF_PREALLOCATE
 781         /* We preallocate blocks only for regular files. It also makes sense
 782          * for directories but there's a problem when to drop the
 783          * preallocation. We might use some delayed work for that but I feel
 784          * it's overengineering for a filesystem like UDF. */
 785         if (S_ISREG(inode->i_mode))
 786                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 787 #endif
 788
 789         /* merge any continuous blocks in laarr */
 790         udf_merge_extents(inode, laarr, &endnum);
 791
 792         /* write back the new extents, inserting new extents if the new number
 793          * of extents is greater than the old number, and deleting extents if
 794          * the new number of extents is less than the old number */
 795         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 796
 797         brelse(prev_epos.bh);
 798
 799         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 800                                 iinfo->i_location.partitionReferenceNum, 0);
 801         if (!newblock) {
 802                 *err = -EIO;
 803                 return 0;
 804         }
 805         *new = 1;
 806         iinfo->i_next_alloc_block = block;
 807         iinfo->i_next_alloc_goal = newblocknum;
 808         inode->i_ctime = current_fs_time(inode->i_sb);
 809
 810         if (IS_SYNC(inode))
 811                 udf_sync_inode(inode);
 812         else
 813                 mark_inode_dirty(inode);
 814
 815         return newblock;
 816 }
 817
 818 static void udf_split_extents(struct inode *inode, int *c, int offset,
 819                               int newblocknum,
 820                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 821                               int *endnum)
 822 {
 823         unsigned long blocksize = inode->i_sb->s_blocksize;
 824         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 825
 826         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 827             (laarr[*c].extLength >> 30) ==
 828                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 829                 int curr = *c;
 830                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 831                             blocksize - 1) >> blocksize_bits;
 832                 int8_t etype = (laarr[curr].extLength >> 30);
 833
 834                 if (blen == 1)
 835                         ;
 836                 else if (!offset || blen == offset + 1) {
 837                         laarr[curr + 2] = laarr[curr + 1];
 838                         laarr[curr + 1] = laarr[curr];
 839                 } else {
 840                         laarr[curr + 3] = laarr[curr + 1];
 841                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 842                 }
 843
 844                 if (offset) {
 845                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 846                                 udf_free_blocks(inode->i_sb, inode,
 847                                                 &laarr[curr].extLocation,
 848                                                 0, offset);
 849                                 laarr[curr].extLength =
 850                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 851                                         (offset << blocksize_bits);
 852                                 laarr[curr].extLocation.logicalBlockNum = 0;
 853                                 laarr[curr].extLocation.
 854                                                 partitionReferenceNum = 0;
 855                         } else
 856                                 laarr[curr].extLength = (etype << 30) |
 857                                         (offset << blocksize_bits);
 858                         curr++;
 859                         (*c)++;
 860                         (*endnum)++;
 861                 }
 862
 863                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 864                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 865                         laarr[curr].extLocation.partitionReferenceNum =
 866                                 UDF_I(inode)->i_location.partitionReferenceNum;
 867                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 868                         blocksize;
 869                 curr++;
 870
 871                 if (blen != offset + 1) {
 872                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 873                                 laarr[curr].extLocation.logicalBlockNum +=
 874                                                                 offset + 1;
 875                         laarr[curr].extLength = (etype << 30) |
 876                                 ((blen - (offset + 1)) << blocksize_bits);
 877                         curr++;
 878                         (*endnum)++;
 879                 }
 880         }
 881 }
 882
 883 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 884                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 885                                  int *endnum)
 886 {
 887         int start, length = 0, currlength = 0, i;
 888
 889         if (*endnum >= (c + 1)) {
 890                 if (!lastblock)
 891                         return;
 892                 else
 893                         start = c;
 894         } else {
 895                 if ((laarr[c + 1].extLength >> 30) ==
 896                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 897                         start = c + 1;
 898                         length = currlength =
 899                                 (((laarr[c + 1].extLength &
 900                                         UDF_EXTENT_LENGTH_MASK) +
 901                                 inode->i_sb->s_blocksize - 1) >>
 902                                 inode->i_sb->s_blocksize_bits);
 903                 } else
 904                         start = c;
 905         }
 906
 907         for (i = start + 1; i <= *endnum; i++) {
 908                 if (i == *endnum) {
 909                         if (lastblock)
 910                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 911                 } else if ((laarr[i].extLength >> 30) ==
 912                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 913                         length += (((laarr[i].extLength &
 914                                                 UDF_EXTENT_LENGTH_MASK) +
 915                                     inode->i_sb->s_blocksize - 1) >>
 916                                     inode->i_sb->s_blocksize_bits);
 917                 } else
 918                         break;
 919         }
 920
 921         if (length) {
 922                 int next = laarr[start].extLocation.logicalBlockNum +
 923                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 924                           inode->i_sb->s_blocksize - 1) >>
 925                           inode->i_sb->s_blocksize_bits);
 926                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 927                                 laarr[start].extLocation.partitionReferenceNum,
 928                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 929                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 930                                 currlength);
 931                 if (numalloc)   {
 932                         if (start == (c + 1))
 933                                 laarr[start].extLength +=
 934                                         (numalloc <<
 935                                          inode->i_sb->s_blocksize_bits);
 936                         else {
 937                                 memmove(&laarr[c + 2], &laarr[c + 1],
 938                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 939                                 (*endnum)++;
 940                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 941                                 laarr[c + 1].extLocation.partitionReferenceNum =
 942                                         laarr[c].extLocation.
 943                                                         partitionReferenceNum;
 944                                 laarr[c + 1].extLength =
 945                                         EXT_NOT_RECORDED_ALLOCATED |
 946                                         (numalloc <<
 947                                          inode->i_sb->s_blocksize_bits);
 948                                 start = c + 1;
 949                         }
 950
 951                         for (i = start + 1; numalloc && i < *endnum; i++) {
 952                                 int elen = ((laarr[i].extLength &
 953                                                 UDF_EXTENT_LENGTH_MASK) +
 954                                             inode->i_sb->s_blocksize - 1) >>
 955                                             inode->i_sb->s_blocksize_bits;
 956
 957                                 if (elen > numalloc) {
 958                                         laarr[i].extLength -=
 959                                                 (numalloc <<
 960                                                  inode->i_sb->s_blocksize_bits);
 961                                         numalloc = 0;
 962                                 } else {
 963                                         numalloc -= elen;
 964                                         if (*endnum > (i + 1))
 965                                                 memmove(&laarr[i],
 966                                                         &laarr[i + 1],
 967                                                         sizeof(struct long_ad) *
 968                                                         (*endnum - (i + 1)));
 969                                         i--;
 970                                         (*endnum)--;
 971                                 }
 972                         }
 973                         UDF_I(inode)->i_lenExtents +=
 974                                 numalloc << inode->i_sb->s_blocksize_bits;
 975                 }
 976         }
 977 }
 978
 979 static void udf_merge_extents(struct inode *inode,
 980                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 981                               int *endnum)
 982 {
 983         int i;
 984         unsigned long blocksize = inode->i_sb->s_blocksize;
 985         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 986
 987         for (i = 0; i < (*endnum - 1); i++) {
 988                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 989                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 990
 991                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 992                         (((li->extLength >> 30) ==
 993                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 994                         ((lip1->extLocation.logicalBlockNum -
 995                           li->extLocation.logicalBlockNum) ==
 996                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 997                         blocksize - 1) >> blocksize_bits)))) {
 998
 999                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1000                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1001                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1002                                 lip1->extLength = (lip1->extLength -
1003                                                   (li->extLength &
1004                                                    UDF_EXTENT_LENGTH_MASK) +
1005                                                    UDF_EXTENT_LENGTH_MASK) &
1006                                                         ~(blocksize - 1);
1007                                 li->extLength = (li->extLength &
1008                                                  UDF_EXTENT_FLAG_MASK) +
1009                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1010                                                 blocksize;
1011                                 lip1->extLocation.logicalBlockNum =
1012                                         li->extLocation.logicalBlockNum +
1013                                         ((li->extLength &
1014                                                 UDF_EXTENT_LENGTH_MASK) >>
1015                                                 blocksize_bits);
1016                         } else {
1017                                 li->extLength = lip1->extLength +
1018                                         (((li->extLength &
1019                                                 UDF_EXTENT_LENGTH_MASK) +
1020                                          blocksize - 1) & ~(blocksize - 1));
1021                                 if (*endnum > (i + 2))
1022                                         memmove(&laarr[i + 1], &laarr[i + 2],
1023                                                 sizeof(struct long_ad) *
1024                                                 (*endnum - (i + 2)));
1025                                 i--;
1026                                 (*endnum)--;
1027                         }
1028                 } else if (((li->extLength >> 30) ==
1029                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1030                            ((lip1->extLength >> 30) ==
1031                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1032                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1033                                         ((li->extLength &
1034                                           UDF_EXTENT_LENGTH_MASK) +
1035                                          blocksize - 1) >> blocksize_bits);
1036                         li->extLocation.logicalBlockNum = 0;
1037                         li->extLocation.partitionReferenceNum = 0;
1038
1039                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1040                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1041                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1042                                 lip1->extLength = (lip1->extLength -
1043                                                    (li->extLength &
1044                                                    UDF_EXTENT_LENGTH_MASK) +
1045                                                    UDF_EXTENT_LENGTH_MASK) &
1046                                                    ~(blocksize - 1);
1047                                 li->extLength = (li->extLength &
1048                                                  UDF_EXTENT_FLAG_MASK) +
1049                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1050                                                 blocksize;
1051                         } else {
1052                                 li->extLength = lip1->extLength +
1053                                         (((li->extLength &
1054                                                 UDF_EXTENT_LENGTH_MASK) +
1055                                           blocksize - 1) & ~(blocksize - 1));
1056                                 if (*endnum > (i + 2))
1057                                         memmove(&laarr[i + 1], &laarr[i + 2],
1058                                                 sizeof(struct long_ad) *
1059                                                 (*endnum - (i + 2)));
1060                                 i--;
1061                                 (*endnum)--;
1062                         }
1063                 } else if ((li->extLength >> 30) ==
1064                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1065                         udf_free_blocks(inode->i_sb, inode,
1066                                         &li->extLocation, 0,
1067                                         ((li->extLength &
1068                                                 UDF_EXTENT_LENGTH_MASK) +
1069                                          blocksize - 1) >> blocksize_bits);
1070                         li->extLocation.logicalBlockNum = 0;
1071                         li->extLocation.partitionReferenceNum = 0;
1072                         li->extLength = (li->extLength &
1073                                                 UDF_EXTENT_LENGTH_MASK) |
1074                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1075                 }
1076         }
1077 }
1078
1079 static void udf_update_extents(struct inode *inode,
1080                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1081                                int startnum, int endnum,
1082                                struct extent_position *epos)
1083 {
1084         int start = 0, i;
1085         struct kernel_lb_addr tmploc;
1086         uint32_t tmplen;
1087
1088         if (startnum > endnum) {
1089                 for (i = 0; i < (startnum - endnum); i++)
1090                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1091                                         laarr[i].extLength);
1092         } else if (startnum < endnum) {
1093                 for (i = 0; i < (endnum - startnum); i++) {
1094                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1095                                         laarr[i].extLength);
1096                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1097                                       &laarr[i].extLength, 1);
1098                         start++;
1099                 }
1100         }
1101
1102         for (i = start; i < endnum; i++) {
1103                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1104                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1105                                laarr[i].extLength, 1);
1106         }
1107 }
1108
1109 struct buffer_head *udf_bread(struct inode *inode, int block,
1110                               int create, int *err)
1111 {
1112         struct buffer_head *bh = NULL;
1113
1114         bh = udf_getblk(inode, block, create, err);
1115         if (!bh)
1116                 return NULL;
1117
1118         if (buffer_uptodate(bh))
1119                 return bh;
1120
1121         ll_rw_block(READ, 1, &bh);
1122
1123         wait_on_buffer(bh);
1124         if (buffer_uptodate(bh))
1125                 return bh;
1126
1127         brelse(bh);
1128         *err = -EIO;
1129         return NULL;
1130 }
1131
1132 int udf_setsize(struct inode *inode, loff_t newsize)
1133 {
1134         int err;
1135         struct udf_inode_info *iinfo;
1136         int bsize = 1 << inode->i_blkbits;
1137
1138         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1139               S_ISLNK(inode->i_mode)))
1140                 return -EINVAL;
1141         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1142                 return -EPERM;
1143
1144         iinfo = UDF_I(inode);
1145         if (newsize > inode->i_size) {
1146                 down_write(&iinfo->i_data_sem);
1147                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1148                         if (bsize <
1149                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1150                                 err = udf_expand_file_adinicb(inode);
1151                                 if (err)
1152                                         return err;
1153                                 down_write(&iinfo->i_data_sem);
1154                         } else {
1155                                 iinfo->i_lenAlloc = newsize;
1156                                 goto set_size;
1157                         }
1158                 }
1159                 err = udf_extend_file(inode, newsize);
1160                 if (err) {
1161                         up_write(&iinfo->i_data_sem);
1162                         return err;
1163                 }
1164 set_size:
1165                 truncate_setsize(inode, newsize);
1166                 up_write(&iinfo->i_data_sem);
1167         } else {
1168                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1169                         down_write(&iinfo->i_data_sem);
1170                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1171                                0x00, bsize - newsize -
1172                                udf_file_entry_alloc_offset(inode));
1173                         iinfo->i_lenAlloc = newsize;
1174                         truncate_setsize(inode, newsize);
1175                         up_write(&iinfo->i_data_sem);
1176                         goto update_time;
1177                 }
1178                 err = block_truncate_page(inode->i_mapping, newsize,
1179                                           udf_get_block);
1180                 if (err)
1181                         return err;
1182                 down_write(&iinfo->i_data_sem);
1183                 truncate_setsize(inode, newsize);
1184                 udf_truncate_extents(inode);
1185                 up_write(&iinfo->i_data_sem);
1186         }
1187 update_time:
1188         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1189         if (IS_SYNC(inode))
1190                 udf_sync_inode(inode);
1191         else
1192                 mark_inode_dirty(inode);
1193         return 0;
1194 }
1195
1196 static void __udf_read_inode(struct inode *inode)
1197 {
1198         struct buffer_head *bh = NULL;
1199         struct fileEntry *fe;
1200         uint16_t ident;
1201         struct udf_inode_info *iinfo = UDF_I(inode);
1202
1203         /*
1204          * Set defaults, but the inode is still incomplete!
1205          * Note: get_new_inode() sets the following on a new inode:
1206          *      i_sb = sb
1207          *      i_no = ino
1208          *      i_flags = sb->s_flags
1209          *      i_state = 0
1210          * clean_inode(): zero fills and sets
1211          *      i_count = 1
1212          *      i_nlink = 1
1213          *      i_op = NULL;
1214          */
1215         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1216         if (!bh) {
1217                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1218                 make_bad_inode(inode);
1219                 return;
1220         }
1221
1222         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1223             ident != TAG_IDENT_USE) {
1224                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1225                         inode->i_ino, ident);
1226                 brelse(bh);
1227                 make_bad_inode(inode);
1228                 return;
1229         }
1230
1231         fe = (struct fileEntry *)bh->b_data;
1232
1233         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1234                 struct buffer_head *ibh;
1235
1236                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1237                                         &ident);
1238                 if (ident == TAG_IDENT_IE && ibh) {
1239                         struct buffer_head *nbh = NULL;
1240                         struct kernel_lb_addr loc;
1241                         struct indirectEntry *ie;
1242
1243                         ie = (struct indirectEntry *)ibh->b_data;
1244                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1245
1246                         if (ie->indirectICB.extLength &&
1247                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1248                                                         &ident))) {
1249                                 if (ident == TAG_IDENT_FE ||
1250                                         ident == TAG_IDENT_EFE) {
1251                                         memcpy(&iinfo->i_location,
1252                                                 &loc,
1253                                                 sizeof(struct kernel_lb_addr));
1254                                         brelse(bh);
1255                                         brelse(ibh);
1256                                         brelse(nbh);
1257                                         __udf_read_inode(inode);
1258                                         return;
1259                                 }
1260                                 brelse(nbh);
1261                         }
1262                 }
1263                 brelse(ibh);
1264         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1265                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1266                         le16_to_cpu(fe->icbTag.strategyType));
1267                 brelse(bh);
1268                 make_bad_inode(inode);
1269                 return;
1270         }
1271         udf_fill_inode(inode, bh);
1272
1273         brelse(bh);
1274 }
1275
1276 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1277 {
1278         struct fileEntry *fe;
1279         struct extendedFileEntry *efe;
1280         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1281         struct udf_inode_info *iinfo = UDF_I(inode);
1282         unsigned int link_count;
1283
1284         fe = (struct fileEntry *)bh->b_data;
1285         efe = (struct extendedFileEntry *)bh->b_data;
1286
1287         if (fe->icbTag.strategyType == cpu_to_le16(4))
1288                 iinfo->i_strat4096 = 0;
1289         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1290                 iinfo->i_strat4096 = 1;
1291
1292         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1293                                                         ICBTAG_FLAG_AD_MASK;
1294         iinfo->i_unique = 0;
1295         iinfo->i_lenEAttr = 0;
1296         iinfo->i_lenExtents = 0;
1297         iinfo->i_lenAlloc = 0;
1298         iinfo->i_next_alloc_block = 0;
1299         iinfo->i_next_alloc_goal = 0;
1300         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1301                 iinfo->i_efe = 1;
1302                 iinfo->i_use = 0;
1303                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1304                                         sizeof(struct extendedFileEntry))) {
1305                         make_bad_inode(inode);
1306                         return;
1307                 }
1308                 memcpy(iinfo->i_ext.i_data,
1309                        bh->b_data + sizeof(struct extendedFileEntry),
1310                        inode->i_sb->s_blocksize -
1311                                         sizeof(struct extendedFileEntry));
1312         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1313                 iinfo->i_efe = 0;
1314                 iinfo->i_use = 0;
1315                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1316                                                 sizeof(struct fileEntry))) {
1317                         make_bad_inode(inode);
1318                         return;
1319                 }
1320                 memcpy(iinfo->i_ext.i_data,
1321                        bh->b_data + sizeof(struct fileEntry),
1322                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1323         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1324                 iinfo->i_efe = 0;
1325                 iinfo->i_use = 1;
1326                 iinfo->i_lenAlloc = le32_to_cpu(
1327                                 ((struct unallocSpaceEntry *)bh->b_data)->
1328                                  lengthAllocDescs);
1329                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1330                                         sizeof(struct unallocSpaceEntry))) {
1331                         make_bad_inode(inode);
1332                         return;
1333                 }
1334                 memcpy(iinfo->i_ext.i_data,
1335                        bh->b_data + sizeof(struct unallocSpaceEntry),
1336                        inode->i_sb->s_blocksize -
1337                                         sizeof(struct unallocSpaceEntry));
1338                 return;
1339         }
1340
1341         read_lock(&sbi->s_cred_lock);
1342         i_uid_write(inode, le32_to_cpu(fe->uid));
1343         if (!uid_valid(inode->i_uid) ||
1344             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1345             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1346                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1347
1348         i_gid_write(inode, le32_to_cpu(fe->gid));
1349         if (!gid_valid(inode->i_gid) ||
1350             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1351             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1352                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1353
1354         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1355                         sbi->s_fmode != UDF_INVALID_MODE)
1356                 inode->i_mode = sbi->s_fmode;
1357         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1358                         sbi->s_dmode != UDF_INVALID_MODE)
1359                 inode->i_mode = sbi->s_dmode;
1360         else
1361                 inode->i_mode = udf_convert_permissions(fe);
1362         inode->i_mode &= ~sbi->s_umask;
1363         read_unlock(&sbi->s_cred_lock);
1364
1365         link_count = le16_to_cpu(fe->fileLinkCount);
1366         if (!link_count)
1367                 link_count = 1;
1368         set_nlink(inode, link_count);
1369
1370         inode->i_size = le64_to_cpu(fe->informationLength);
1371         iinfo->i_lenExtents = inode->i_size;
1372
1373         if (iinfo->i_efe == 0) {
1374                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1375                         (inode->i_sb->s_blocksize_bits - 9);
1376
1377                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1378                         inode->i_atime = sbi->s_record_time;
1379
1380                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1381                                             fe->modificationTime))
1382                         inode->i_mtime = sbi->s_record_time;
1383
1384                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1385                         inode->i_ctime = sbi->s_record_time;
1386
1387                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1388                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1389                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1390                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1391         } else {
1392                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1393                     (inode->i_sb->s_blocksize_bits - 9);
1394
1395                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1396                         inode->i_atime = sbi->s_record_time;
1397
1398                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1399                                             efe->modificationTime))
1400                         inode->i_mtime = sbi->s_record_time;
1401
1402                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1403                         iinfo->i_crtime = sbi->s_record_time;
1404
1405                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1406                         inode->i_ctime = sbi->s_record_time;
1407
1408                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1409                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1410                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1411                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1412         }
1413
1414         switch (fe->icbTag.fileType) {
1415         case ICBTAG_FILE_TYPE_DIRECTORY:
1416                 inode->i_op = &udf_dir_inode_operations;
1417                 inode->i_fop = &udf_dir_operations;
1418                 inode->i_mode |= S_IFDIR;
1419                 inc_nlink(inode);
1420                 break;
1421         case ICBTAG_FILE_TYPE_REALTIME:
1422         case ICBTAG_FILE_TYPE_REGULAR:
1423         case ICBTAG_FILE_TYPE_UNDEF:
1424         case ICBTAG_FILE_TYPE_VAT20:
1425                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1426                         inode->i_data.a_ops = &udf_adinicb_aops;
1427                 else
1428                         inode->i_data.a_ops = &udf_aops;
1429                 inode->i_op = &udf_file_inode_operations;
1430                 inode->i_fop = &udf_file_operations;
1431                 inode->i_mode |= S_IFREG;
1432                 break;
1433         case ICBTAG_FILE_TYPE_BLOCK:
1434                 inode->i_mode |= S_IFBLK;
1435                 break;
1436         case ICBTAG_FILE_TYPE_CHAR:
1437                 inode->i_mode |= S_IFCHR;
1438                 break;
1439         case ICBTAG_FILE_TYPE_FIFO:
1440                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1441                 break;
1442         case ICBTAG_FILE_TYPE_SOCKET:
1443                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1444                 break;
1445         case ICBTAG_FILE_TYPE_SYMLINK:
1446                 inode->i_data.a_ops = &udf_symlink_aops;
1447                 inode->i_op = &udf_symlink_inode_operations;
1448                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1449                 break;
1450         case ICBTAG_FILE_TYPE_MAIN:
1451                 udf_debug("METADATA FILE-----\n");
1452                 break;
1453         case ICBTAG_FILE_TYPE_MIRROR:
1454                 udf_debug("METADATA MIRROR FILE-----\n");
1455                 break;
1456         case ICBTAG_FILE_TYPE_BITMAP:
1457                 udf_debug("METADATA BITMAP FILE-----\n");
1458                 break;
1459         default:
1460                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1461                         inode->i_ino, fe->icbTag.fileType);
1462                 make_bad_inode(inode);
1463                 return;
1464         }
1465         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1466                 struct deviceSpec *dsea =
1467                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1468                 if (dsea) {
1469                         init_special_inode(inode, inode->i_mode,
1470                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1471                                       le32_to_cpu(dsea->minorDeviceIdent)));
1472                         /* Developer ID ??? */
1473                 } else
1474                         make_bad_inode(inode);
1475         }
1476 }
1477
1478 static int udf_alloc_i_data(struct inode *inode, size_t size)
1479 {
1480         struct udf_inode_info *iinfo = UDF_I(inode);
1481         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1482
1483         if (!iinfo->i_ext.i_data) {
1484                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1485                         inode->i_ino);
1486                 return -ENOMEM;
1487         }
1488
1489         return 0;
1490 }
1491
1492 static umode_t udf_convert_permissions(struct fileEntry *fe)
1493 {
1494         umode_t mode;
1495         uint32_t permissions;
1496         uint32_t flags;
1497
1498         permissions = le32_to_cpu(fe->permissions);
1499         flags = le16_to_cpu(fe->icbTag.flags);
1500
1501         mode =  ((permissions) & S_IRWXO) |
1502                 ((permissions >> 2) & S_IRWXG) |
1503                 ((permissions >> 4) & S_IRWXU) |
1504                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1505                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1506                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1507
1508         return mode;
1509 }
1510
1511 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1512 {
1513         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1514 }
1515
1516 static int udf_sync_inode(struct inode *inode)
1517 {
1518         return udf_update_inode(inode, 1);
1519 }
1520
1521 static int udf_update_inode(struct inode *inode, int do_sync)
1522 {
1523         struct buffer_head *bh = NULL;
1524         struct fileEntry *fe;
1525         struct extendedFileEntry *efe;
1526         uint64_t lb_recorded;
1527         uint32_t udfperms;
1528         uint16_t icbflags;
1529         uint16_t crclen;
1530         int err = 0;
1531         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1532         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1533         struct udf_inode_info *iinfo = UDF_I(inode);
1534
1535         bh = udf_tgetblk(inode->i_sb,
1536                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1537         if (!bh) {
1538                 udf_debug("getblk failure\n");
1539                 return -ENOMEM;
1540         }
1541
1542         lock_buffer(bh);
1543         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1544         fe = (struct fileEntry *)bh->b_data;
1545         efe = (struct extendedFileEntry *)bh->b_data;
1546
1547         if (iinfo->i_use) {
1548                 struct unallocSpaceEntry *use =
1549                         (struct unallocSpaceEntry *)bh->b_data;
1550
1551                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1552                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1553                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1554                                         sizeof(struct unallocSpaceEntry));
1555                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1556                 use->descTag.tagLocation =
1557                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1558                 crclen = sizeof(struct unallocSpaceEntry) +
1559                                 iinfo->i_lenAlloc - sizeof(struct tag);
1560                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1561                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1562                                                            sizeof(struct tag),
1563                                                            crclen));
1564                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1565
1566                 goto out;
1567         }
1568
1569         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1570                 fe->uid = cpu_to_le32(-1);
1571         else
1572                 fe->uid = cpu_to_le32(i_uid_read(inode));
1573
1574         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1575                 fe->gid = cpu_to_le32(-1);
1576         else
1577                 fe->gid = cpu_to_le32(i_gid_read(inode));
1578
1579         udfperms = ((inode->i_mode & S_IRWXO)) |
1580                    ((inode->i_mode & S_IRWXG) << 2) |
1581                    ((inode->i_mode & S_IRWXU) << 4);
1582
1583         udfperms |= (le32_to_cpu(fe->permissions) &
1584                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1585                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1586                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1587         fe->permissions = cpu_to_le32(udfperms);
1588
1589         if (S_ISDIR(inode->i_mode))
1590                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1591         else
1592                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1593
1594         fe->informationLength = cpu_to_le64(inode->i_size);
1595
1596         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1597                 struct regid *eid;
1598                 struct deviceSpec *dsea =
1599                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1600                 if (!dsea) {
1601                         dsea = (struct deviceSpec *)
1602                                 udf_add_extendedattr(inode,
1603                                                      sizeof(struct deviceSpec) +
1604                                                      sizeof(struct regid), 12, 0x3);
1605                         dsea->attrType = cpu_to_le32(12);
1606                         dsea->attrSubtype = 1;
1607                         dsea->attrLength = cpu_to_le32(
1608                                                 sizeof(struct deviceSpec) +
1609                                                 sizeof(struct regid));
1610                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1611                 }
1612                 eid = (struct regid *)dsea->impUse;
1613                 memset(eid, 0, sizeof(struct regid));
1614                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1615                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1616                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1617                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1618                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1619         }
1620
1621         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1622                 lb_recorded = 0; /* No extents => no blocks! */
1623         else
1624                 lb_recorded =
1625                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1626                         (blocksize_bits - 9);
1627
1628         if (iinfo->i_efe == 0) {
1629                 memcpy(bh->b_data + sizeof(struct fileEntry),
1630                        iinfo->i_ext.i_data,
1631                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1632                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1633
1634                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1635                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1636                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1637                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1638                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1639                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1640                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1641                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1642                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1643                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1644                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1645                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1646                 crclen = sizeof(struct fileEntry);
1647         } else {
1648                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1649                        iinfo->i_ext.i_data,
1650                        inode->i_sb->s_blocksize -
1651                                         sizeof(struct extendedFileEntry));
1652                 efe->objectSize = cpu_to_le64(inode->i_size);
1653                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1654
1655                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1656                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1657                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1658                         iinfo->i_crtime = inode->i_atime;
1659
1660                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1661                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1662                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1663                         iinfo->i_crtime = inode->i_mtime;
1664
1665                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1666                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1667                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1668                         iinfo->i_crtime = inode->i_ctime;
1669
1670                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1671                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1672                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1673                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1674
1675                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1676                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1677                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1678                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1679                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1680                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1681                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1682                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1683                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1684                 crclen = sizeof(struct extendedFileEntry);
1685         }
1686         if (iinfo->i_strat4096) {
1687                 fe->icbTag.strategyType = cpu_to_le16(4096);
1688                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1689                 fe->icbTag.numEntries = cpu_to_le16(2);
1690         } else {
1691                 fe->icbTag.strategyType = cpu_to_le16(4);
1692                 fe->icbTag.numEntries = cpu_to_le16(1);
1693         }
1694
1695         if (S_ISDIR(inode->i_mode))
1696                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1697         else if (S_ISREG(inode->i_mode))
1698                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1699         else if (S_ISLNK(inode->i_mode))
1700                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1701         else if (S_ISBLK(inode->i_mode))
1702                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1703         else if (S_ISCHR(inode->i_mode))
1704                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1705         else if (S_ISFIFO(inode->i_mode))
1706                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1707         else if (S_ISSOCK(inode->i_mode))
1708                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1709
1710         icbflags =      iinfo->i_alloc_type |
1711                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1712                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1713                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1714                         (le16_to_cpu(fe->icbTag.flags) &
1715                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1716                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1717
1718         fe->icbTag.flags = cpu_to_le16(icbflags);
1719         if (sbi->s_udfrev >= 0x0200)
1720                 fe->descTag.descVersion = cpu_to_le16(3);
1721         else
1722                 fe->descTag.descVersion = cpu_to_le16(2);
1723         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1724         fe->descTag.tagLocation = cpu_to_le32(
1725                                         iinfo->i_location.logicalBlockNum);
1726         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1727         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1728         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1729                                                   crclen));
1730         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1731
1732 out:
1733         set_buffer_uptodate(bh);
1734         unlock_buffer(bh);
1735
1736         /* write the data blocks */
1737         mark_buffer_dirty(bh);
1738         if (do_sync) {
1739                 sync_dirty_buffer(bh);
1740                 if (buffer_write_io_error(bh)) {
1741                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1742                                  inode->i_ino);
1743                         err = -EIO;
1744                 }
1745         }
1746         brelse(bh);
1747
1748         return err;
1749 }
1750
1751 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1752 {
1753         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1754         struct inode *inode = iget_locked(sb, block);
1755
1756         if (!inode)
1757                 return NULL;
1758
1759         if (inode->i_state & I_NEW) {
1760                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1761                 __udf_read_inode(inode);
1762                 unlock_new_inode(inode);
1763         }
1764
1765         if (is_bad_inode(inode))
1766                 goto out_iput;
1767
1768         if (ino->logicalBlockNum >= UDF_SB(sb)->
1769                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1770                 udf_debug("block=%d, partition=%d out of range\n",
1771                           ino->logicalBlockNum, ino->partitionReferenceNum);
1772                 make_bad_inode(inode);
1773                 goto out_iput;
1774         }
1775
1776         return inode;
1777
1778  out_iput:
1779         iput(inode);
1780         return NULL;
1781 }
1782
1783 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1784                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1785 {
1786         int adsize;
1787         struct short_ad *sad = NULL;
1788         struct long_ad *lad = NULL;
1789         struct allocExtDesc *aed;
1790         uint8_t *ptr;
1791         struct udf_inode_info *iinfo = UDF_I(inode);
1792
1793         if (!epos->bh)
1794                 ptr = iinfo->i_ext.i_data + epos->offset -
1795                         udf_file_entry_alloc_offset(inode) +
1796                         iinfo->i_lenEAttr;
1797         else
1798                 ptr = epos->bh->b_data + epos->offset;
1799
1800         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1801                 adsize = sizeof(struct short_ad);
1802         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1803                 adsize = sizeof(struct long_ad);
1804         else
1805                 return -EIO;
1806
1807         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1808                 unsigned char *sptr, *dptr;
1809                 struct buffer_head *nbh;
1810                 int err, loffset;
1811                 struct kernel_lb_addr obloc = epos->block;
1812
1813                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1814                                                 obloc.partitionReferenceNum,
1815                                                 obloc.logicalBlockNum, &err);
1816                 if (!epos->block.logicalBlockNum)
1817                         return -ENOSPC;
1818                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1819                                                                  &epos->block,
1820                                                                  0));
1821                 if (!nbh)
1822                         return -EIO;
1823                 lock_buffer(nbh);
1824                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1825                 set_buffer_uptodate(nbh);
1826                 unlock_buffer(nbh);
1827                 mark_buffer_dirty_inode(nbh, inode);
1828
1829                 aed = (struct allocExtDesc *)(nbh->b_data);
1830                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1831                         aed->previousAllocExtLocation =
1832                                         cpu_to_le32(obloc.logicalBlockNum);
1833                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1834                         loffset = epos->offset;
1835                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1836                         sptr = ptr - adsize;
1837                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1838                         memcpy(dptr, sptr, adsize);
1839                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1840                 } else {
1841                         loffset = epos->offset + adsize;
1842                         aed->lengthAllocDescs = cpu_to_le32(0);
1843                         sptr = ptr;
1844                         epos->offset = sizeof(struct allocExtDesc);
1845
1846                         if (epos->bh) {
1847                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1848                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1849                         } else {
1850                                 iinfo->i_lenAlloc += adsize;
1851                                 mark_inode_dirty(inode);
1852                         }
1853                 }
1854                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1855                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1856                                     epos->block.logicalBlockNum, sizeof(struct tag));
1857                 else
1858                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1859                                     epos->block.logicalBlockNum, sizeof(struct tag));
1860                 switch (iinfo->i_alloc_type) {
1861                 case ICBTAG_FLAG_AD_SHORT:
1862                         sad = (struct short_ad *)sptr;
1863                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1864                                                      inode->i_sb->s_blocksize);
1865                         sad->extPosition =
1866                                 cpu_to_le32(epos->block.logicalBlockNum);
1867                         break;
1868                 case ICBTAG_FLAG_AD_LONG:
1869                         lad = (struct long_ad *)sptr;
1870                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1871                                                      inode->i_sb->s_blocksize);
1872                         lad->extLocation = cpu_to_lelb(epos->block);
1873                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1874                         break;
1875                 }
1876                 if (epos->bh) {
1877                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1878                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1879                                 udf_update_tag(epos->bh->b_data, loffset);
1880                         else
1881                                 udf_update_tag(epos->bh->b_data,
1882                                                 sizeof(struct allocExtDesc));
1883                         mark_buffer_dirty_inode(epos->bh, inode);
1884                         brelse(epos->bh);
1885                 } else {
1886                         mark_inode_dirty(inode);
1887                 }
1888                 epos->bh = nbh;
1889         }
1890
1891         udf_write_aext(inode, epos, eloc, elen, inc);
1892
1893         if (!epos->bh) {
1894                 iinfo->i_lenAlloc += adsize;
1895                 mark_inode_dirty(inode);
1896         } else {
1897                 aed = (struct allocExtDesc *)epos->bh->b_data;
1898                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1899                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1900                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1901                         udf_update_tag(epos->bh->b_data,
1902                                         epos->offset + (inc ? 0 : adsize));
1903                 else
1904                         udf_update_tag(epos->bh->b_data,
1905                                         sizeof(struct allocExtDesc));
1906                 mark_buffer_dirty_inode(epos->bh, inode);
1907         }
1908
1909         return 0;
1910 }
1911
1912 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1913                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1914 {
1915         int adsize;
1916         uint8_t *ptr;
1917         struct short_ad *sad;
1918         struct long_ad *lad;
1919         struct udf_inode_info *iinfo = UDF_I(inode);
1920
1921         if (!epos->bh)
1922                 ptr = iinfo->i_ext.i_data + epos->offset -
1923                         udf_file_entry_alloc_offset(inode) +
1924                         iinfo->i_lenEAttr;
1925         else
1926                 ptr = epos->bh->b_data + epos->offset;
1927
1928         switch (iinfo->i_alloc_type) {
1929         case ICBTAG_FLAG_AD_SHORT:
1930                 sad = (struct short_ad *)ptr;
1931                 sad->extLength = cpu_to_le32(elen);
1932                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1933                 adsize = sizeof(struct short_ad);
1934                 break;
1935         case ICBTAG_FLAG_AD_LONG:
1936                 lad = (struct long_ad *)ptr;
1937                 lad->extLength = cpu_to_le32(elen);
1938                 lad->extLocation = cpu_to_lelb(*eloc);
1939                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1940                 adsize = sizeof(struct long_ad);
1941                 break;
1942         default:
1943                 return;
1944         }
1945
1946         if (epos->bh) {
1947                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1948                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1949                         struct allocExtDesc *aed =
1950                                 (struct allocExtDesc *)epos->bh->b_data;
1951                         udf_update_tag(epos->bh->b_data,
1952                                        le32_to_cpu(aed->lengthAllocDescs) +
1953                                        sizeof(struct allocExtDesc));
1954                 }
1955                 mark_buffer_dirty_inode(epos->bh, inode);
1956         } else {
1957                 mark_inode_dirty(inode);
1958         }
1959
1960         if (inc)
1961                 epos->offset += adsize;
1962 }
1963
1964 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1965                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1966 {
1967         int8_t etype;
1968
1969         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1970                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1971                 int block;
1972                 epos->block = *eloc;
1973                 epos->offset = sizeof(struct allocExtDesc);
1974                 brelse(epos->bh);
1975                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1976                 epos->bh = udf_tread(inode->i_sb, block);
1977                 if (!epos->bh) {
1978                         udf_debug("reading block %d failed!\n", block);
1979                         return -1;
1980                 }
1981         }
1982
1983         return etype;
1984 }
1985
1986 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1987                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1988 {
1989         int alen;
1990         int8_t etype;
1991         uint8_t *ptr;
1992         struct short_ad *sad;
1993         struct long_ad *lad;
1994         struct udf_inode_info *iinfo = UDF_I(inode);
1995
1996         if (!epos->bh) {
1997                 if (!epos->offset)
1998                         epos->offset = udf_file_entry_alloc_offset(inode);
1999                 ptr = iinfo->i_ext.i_data + epos->offset -
2000                         udf_file_entry_alloc_offset(inode) +
2001                         iinfo->i_lenEAttr;
2002                 alen = udf_file_entry_alloc_offset(inode) +
2003                                                         iinfo->i_lenAlloc;
2004         } else {
2005                 if (!epos->offset)
2006                         epos->offset = sizeof(struct allocExtDesc);
2007                 ptr = epos->bh->b_data + epos->offset;
2008                 alen = sizeof(struct allocExtDesc) +
2009                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2010                                                         lengthAllocDescs);
2011         }
2012
2013         switch (iinfo->i_alloc_type) {
2014         case ICBTAG_FLAG_AD_SHORT:
2015                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2016                 if (!sad)
2017                         return -1;
2018                 etype = le32_to_cpu(sad->extLength) >> 30;
2019                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2020                 eloc->partitionReferenceNum =
2021                                 iinfo->i_location.partitionReferenceNum;
2022                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2023                 break;
2024         case ICBTAG_FLAG_AD_LONG:
2025                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2026                 if (!lad)
2027                         return -1;
2028                 etype = le32_to_cpu(lad->extLength) >> 30;
2029                 *eloc = lelb_to_cpu(lad->extLocation);
2030                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2031                 break;
2032         default:
2033                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2034                 return -1;
2035         }
2036
2037         return etype;
2038 }
2039
2040 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2041                               struct kernel_lb_addr neloc, uint32_t nelen)
2042 {
2043         struct kernel_lb_addr oeloc;
2044         uint32_t oelen;
2045         int8_t etype;
2046
2047         if (epos.bh)
2048                 get_bh(epos.bh);
2049
2050         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2051                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2052                 neloc = oeloc;
2053                 nelen = (etype << 30) | oelen;
2054         }
2055         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2056         brelse(epos.bh);
2057
2058         return (nelen >> 30);
2059 }
2060
2061 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2062                        struct kernel_lb_addr eloc, uint32_t elen)
2063 {
2064         struct extent_position oepos;
2065         int adsize;
2066         int8_t etype;
2067         struct allocExtDesc *aed;
2068         struct udf_inode_info *iinfo;
2069
2070         if (epos.bh) {
2071                 get_bh(epos.bh);
2072                 get_bh(epos.bh);
2073         }
2074
2075         iinfo = UDF_I(inode);
2076         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2077                 adsize = sizeof(struct short_ad);
2078         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2079                 adsize = sizeof(struct long_ad);
2080         else
2081                 adsize = 0;
2082
2083         oepos = epos;
2084         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2085                 return -1;
2086
2087         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2088                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2089                 if (oepos.bh != epos.bh) {
2090                         oepos.block = epos.block;
2091                         brelse(oepos.bh);
2092                         get_bh(epos.bh);
2093                         oepos.bh = epos.bh;
2094                         oepos.offset = epos.offset - adsize;
2095                 }
2096         }
2097         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2098         elen = 0;
2099
2100         if (epos.bh != oepos.bh) {
2101                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2102                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2103                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2104                 if (!oepos.bh) {
2105                         iinfo->i_lenAlloc -= (adsize * 2);
2106                         mark_inode_dirty(inode);
2107                 } else {
2108                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2109                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2110                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2111                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2112                                 udf_update_tag(oepos.bh->b_data,
2113                                                 oepos.offset - (2 * adsize));
2114                         else
2115                                 udf_update_tag(oepos.bh->b_data,
2116                                                 sizeof(struct allocExtDesc));
2117                         mark_buffer_dirty_inode(oepos.bh, inode);
2118                 }
2119         } else {
2120                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2121                 if (!oepos.bh) {
2122                         iinfo->i_lenAlloc -= adsize;
2123                         mark_inode_dirty(inode);
2124                 } else {
2125                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2126                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2127                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2128                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2129                                 udf_update_tag(oepos.bh->b_data,
2130                                                 epos.offset - adsize);
2131                         else
2132                                 udf_update_tag(oepos.bh->b_data,
2133                                                 sizeof(struct allocExtDesc));
2134                         mark_buffer_dirty_inode(oepos.bh, inode);
2135                 }
2136         }
2137
2138         brelse(epos.bh);
2139         brelse(oepos.bh);
2140
2141         return (elen >> 30);
2142 }
2143
2144 int8_t inode_bmap(struct inode *inode, sector_t block,
2145                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2146                   uint32_t *elen, sector_t *offset)
2147 {
2148         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2149         loff_t lbcount = 0, bcount =
2150             (loff_t) block << blocksize_bits;
2151         int8_t etype;
2152         struct udf_inode_info *iinfo;
2153
2154         iinfo = UDF_I(inode);
2155         pos->offset = 0;
2156         pos->block = iinfo->i_location;
2157         pos->bh = NULL;
2158         *elen = 0;
2159
2160         do {
2161                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2162                 if (etype == -1) {
2163                         *offset = (bcount - lbcount) >> blocksize_bits;
2164                         iinfo->i_lenExtents = lbcount;
2165                         return -1;
2166                 }
2167                 lbcount += *elen;
2168         } while (lbcount <= bcount);
2169
2170         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2171
2172         return etype;
2173 }
2174
2175 long udf_block_map(struct inode *inode, sector_t block)
2176 {
2177         struct kernel_lb_addr eloc;
2178         uint32_t elen;
2179         sector_t offset;
2180         struct extent_position epos = {};
2181         int ret;
2182
2183         down_read(&UDF_I(inode)->i_data_sem);
2184
2185         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2186                                                 (EXT_RECORDED_ALLOCATED >> 30))
2187                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2188         else
2189                 ret = 0;
2190
2191         up_read(&UDF_I(inode)->i_data_sem);
2192         brelse(epos.bh);
2193
2194         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2195                 return udf_fixed_to_variable(ret);
2196         else
2197                 return ret;
2198 }