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
  41 #include "udf_i.h"
  42 #include "udf_sb.h"
  43
  44 MODULE_AUTHOR("Ben Fennema");
  45 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  46 MODULE_LICENSE("GPL");
  47
  48 #define EXTENT_MERGE_SIZE 5
  49
  50 static mode_t udf_convert_permissions(struct fileEntry *);
  51 static int udf_update_inode(struct inode *, int);
  52 static void udf_fill_inode(struct inode *, struct buffer_head *);
  53 static int udf_sync_inode(struct inode *inode);
  54 static int udf_alloc_i_data(struct inode *inode, size_t size);
  55 static struct buffer_head *inode_getblk(struct inode *, sector_t, int *,
  56                                         sector_t *, int *);
  57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  58                               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         end_writeback(inode);
  84         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
  85             inode->i_size != iinfo->i_lenExtents) {
  86                 printk(KERN_WARNING "UDF-fs (%s): Inode %lu (mode %o) has "
  87                         "inode size %llu different from extent length %llu. "
  88                         "Filesystem need not be standards compliant.\n",
  89                         inode->i_sb->s_id, inode->i_ino, inode->i_mode,
  90                         (unsigned long long)inode->i_size,
  91                         (unsigned long long)iinfo->i_lenExtents);
  92         }
  93         kfree(iinfo->i_ext.i_data);
  94         iinfo->i_ext.i_data = NULL;
  95         if (want_delete) {
  96                 udf_free_inode(inode);
  97         }
  98 }
  99
 100 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 101 {
 102         return block_write_full_page(page, udf_get_block, wbc);
 103 }
 104
 105 static int udf_readpage(struct file *file, struct page *page)
 106 {
 107         return block_read_full_page(page, udf_get_block);
 108 }
 109
 110 static int udf_write_begin(struct file *file, struct address_space *mapping,
 111                         loff_t pos, unsigned len, unsigned flags,
 112                         struct page **pagep, void **fsdata)
 113 {
 114         int ret;
 115
 116         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 117         if (unlikely(ret)) {
 118                 struct inode *inode = mapping->host;
 119                 struct udf_inode_info *iinfo = UDF_I(inode);
 120                 loff_t isize = inode->i_size;
 121
 122                 if (pos + len > isize) {
 123                         truncate_pagecache(inode, pos + len, isize);
 124                         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 125                                 down_write(&iinfo->i_data_sem);
 126                                 udf_truncate_extents(inode);
 127                                 up_write(&iinfo->i_data_sem);
 128                         }
 129                 }
 130         }
 131
 132         return ret;
 133 }
 134
 135 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 136 {
 137         return generic_block_bmap(mapping, block, udf_get_block);
 138 }
 139
 140 const struct address_space_operations udf_aops = {
 141         .readpage       = udf_readpage,
 142         .writepage      = udf_writepage,
 143         .write_begin            = udf_write_begin,
 144         .write_end              = generic_write_end,
 145         .bmap           = udf_bmap,
 146 };
 147
 148 int udf_expand_file_adinicb(struct inode *inode)
 149 {
 150         struct page *page;
 151         char *kaddr;
 152         struct udf_inode_info *iinfo = UDF_I(inode);
 153         int err;
 154         struct writeback_control udf_wbc = {
 155                 .sync_mode = WB_SYNC_NONE,
 156                 .nr_to_write = 1,
 157         };
 158
 159         if (!iinfo->i_lenAlloc) {
 160                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 161                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 162                 else
 163                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 164                 /* from now on we have normal address_space methods */
 165                 inode->i_data.a_ops = &udf_aops;
 166                 mark_inode_dirty(inode);
 167                 return 0;
 168         }
 169
 170         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 171         if (!page)
 172                 return -ENOMEM;
 173
 174         if (!PageUptodate(page)) {
 175                 kaddr = kmap(page);
 176                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 177                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 178                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 179                         iinfo->i_lenAlloc);
 180                 flush_dcache_page(page);
 181                 SetPageUptodate(page);
 182                 kunmap(page);
 183         }
 184         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 185                iinfo->i_lenAlloc);
 186         iinfo->i_lenAlloc = 0;
 187         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 188                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 189         else
 190                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 191         /* from now on we have normal address_space methods */
 192         inode->i_data.a_ops = &udf_aops;
 193         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 194         if (err) {
 195                 /* Restore everything back so that we don't lose data... */
 196                 lock_page(page);
 197                 kaddr = kmap(page);
 198                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 199                        inode->i_size);
 200                 kunmap(page);
 201                 unlock_page(page);
 202                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 203                 inode->i_data.a_ops = &udf_adinicb_aops;
 204         }
 205         page_cache_release(page);
 206         mark_inode_dirty(inode);
 207
 208         return err;
 209 }
 210
 211 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 212                                            int *err)
 213 {
 214         int newblock;
 215         struct buffer_head *dbh = NULL;
 216         struct kernel_lb_addr eloc;
 217         uint8_t alloctype;
 218         struct extent_position epos;
 219
 220         struct udf_fileident_bh sfibh, dfibh;
 221         loff_t f_pos = udf_ext0_offset(inode);
 222         int size = udf_ext0_offset(inode) + inode->i_size;
 223         struct fileIdentDesc cfi, *sfi, *dfi;
 224         struct udf_inode_info *iinfo = UDF_I(inode);
 225
 226         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 227                 alloctype = ICBTAG_FLAG_AD_SHORT;
 228         else
 229                 alloctype = ICBTAG_FLAG_AD_LONG;
 230
 231         if (!inode->i_size) {
 232                 iinfo->i_alloc_type = alloctype;
 233                 mark_inode_dirty(inode);
 234                 return NULL;
 235         }
 236
 237         /* alloc block, and copy data to it */
 238         *block = udf_new_block(inode->i_sb, inode,
 239                                iinfo->i_location.partitionReferenceNum,
 240                                iinfo->i_location.logicalBlockNum, err);
 241         if (!(*block))
 242                 return NULL;
 243         newblock = udf_get_pblock(inode->i_sb, *block,
 244                                   iinfo->i_location.partitionReferenceNum,
 245                                 0);
 246         if (!newblock)
 247                 return NULL;
 248         dbh = udf_tgetblk(inode->i_sb, newblock);
 249         if (!dbh)
 250                 return NULL;
 251         lock_buffer(dbh);
 252         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 253         set_buffer_uptodate(dbh);
 254         unlock_buffer(dbh);
 255         mark_buffer_dirty_inode(dbh, inode);
 256
 257         sfibh.soffset = sfibh.eoffset =
 258                         f_pos & (inode->i_sb->s_blocksize - 1);
 259         sfibh.sbh = sfibh.ebh = NULL;
 260         dfibh.soffset = dfibh.eoffset = 0;
 261         dfibh.sbh = dfibh.ebh = dbh;
 262         while (f_pos < size) {
 263                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 264                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 265                                          NULL, NULL, NULL);
 266                 if (!sfi) {
 267                         brelse(dbh);
 268                         return NULL;
 269                 }
 270                 iinfo->i_alloc_type = alloctype;
 271                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 272                 dfibh.soffset = dfibh.eoffset;
 273                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 274                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 275                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 276                                  sfi->fileIdent +
 277                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 278                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 279                         brelse(dbh);
 280                         return NULL;
 281                 }
 282         }
 283         mark_buffer_dirty_inode(dbh, inode);
 284
 285         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 286                 iinfo->i_lenAlloc);
 287         iinfo->i_lenAlloc = 0;
 288         eloc.logicalBlockNum = *block;
 289         eloc.partitionReferenceNum =
 290                                 iinfo->i_location.partitionReferenceNum;
 291         iinfo->i_lenExtents = inode->i_size;
 292         epos.bh = NULL;
 293         epos.block = iinfo->i_location;
 294         epos.offset = udf_file_entry_alloc_offset(inode);
 295         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 296         /* UniqueID stuff */
 297
 298         brelse(epos.bh);
 299         mark_inode_dirty(inode);
 300         return dbh;
 301 }
 302
 303 static int udf_get_block(struct inode *inode, sector_t block,
 304                          struct buffer_head *bh_result, int create)
 305 {
 306         int err, new;
 307         struct buffer_head *bh;
 308         sector_t phys = 0;
 309         struct udf_inode_info *iinfo;
 310
 311         if (!create) {
 312                 phys = udf_block_map(inode, block);
 313                 if (phys)
 314                         map_bh(bh_result, inode->i_sb, phys);
 315                 return 0;
 316         }
 317
 318         err = -EIO;
 319         new = 0;
 320         bh = NULL;
 321         iinfo = UDF_I(inode);
 322
 323         down_write(&iinfo->i_data_sem);
 324         if (block == iinfo->i_next_alloc_block + 1) {
 325                 iinfo->i_next_alloc_block++;
 326                 iinfo->i_next_alloc_goal++;
 327         }
 328
 329         err = 0;
 330
 331         bh = inode_getblk(inode, block, &err, &phys, &new);
 332         BUG_ON(bh);
 333         if (err)
 334                 goto abort;
 335         BUG_ON(!phys);
 336
 337         if (new)
 338                 set_buffer_new(bh_result);
 339         map_bh(bh_result, inode->i_sb, phys);
 340
 341 abort:
 342         up_write(&iinfo->i_data_sem);
 343         return err;
 344 }
 345
 346 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 347                                       int create, int *err)
 348 {
 349         struct buffer_head *bh;
 350         struct buffer_head dummy;
 351
 352         dummy.b_state = 0;
 353         dummy.b_blocknr = -1000;
 354         *err = udf_get_block(inode, block, &dummy, create);
 355         if (!*err && buffer_mapped(&dummy)) {
 356                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 357                 if (buffer_new(&dummy)) {
 358                         lock_buffer(bh);
 359                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 360                         set_buffer_uptodate(bh);
 361                         unlock_buffer(bh);
 362                         mark_buffer_dirty_inode(bh, inode);
 363                 }
 364                 return bh;
 365         }
 366
 367         return NULL;
 368 }
 369
 370 /* Extend the file by 'blocks' blocks, return the number of extents added */
 371 static int udf_do_extend_file(struct inode *inode,
 372                               struct extent_position *last_pos,
 373                               struct kernel_long_ad *last_ext,
 374                               sector_t blocks)
 375 {
 376         sector_t add;
 377         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 378         struct super_block *sb = inode->i_sb;
 379         struct kernel_lb_addr prealloc_loc = {};
 380         int prealloc_len = 0;
 381         struct udf_inode_info *iinfo;
 382         int err;
 383
 384         /* The previous extent is fake and we should not extend by anything
 385          * - there's nothing to do... */
 386         if (!blocks && fake)
 387                 return 0;
 388
 389         iinfo = UDF_I(inode);
 390         /* Round the last extent up to a multiple of block size */
 391         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 392                 last_ext->extLength =
 393                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 394                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 395                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 396                 iinfo->i_lenExtents =
 397                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 398                         ~(sb->s_blocksize - 1);
 399         }
 400
 401         /* Last extent are just preallocated blocks? */
 402         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 403                                                 EXT_NOT_RECORDED_ALLOCATED) {
 404                 /* Save the extent so that we can reattach it to the end */
 405                 prealloc_loc = last_ext->extLocation;
 406                 prealloc_len = last_ext->extLength;
 407                 /* Mark the extent as a hole */
 408                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 409                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 410                 last_ext->extLocation.logicalBlockNum = 0;
 411                 last_ext->extLocation.partitionReferenceNum = 0;
 412         }
 413
 414         /* Can we merge with the previous extent? */
 415         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 416                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 417                 add = ((1 << 30) - sb->s_blocksize -
 418                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 419                         sb->s_blocksize_bits;
 420                 if (add > blocks)
 421                         add = blocks;
 422                 blocks -= add;
 423                 last_ext->extLength += add << sb->s_blocksize_bits;
 424         }
 425
 426         if (fake) {
 427                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 428                              last_ext->extLength, 1);
 429                 count++;
 430         } else
 431                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 432                                 last_ext->extLength, 1);
 433
 434         /* Managed to do everything necessary? */
 435         if (!blocks)
 436                 goto out;
 437
 438         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 439         last_ext->extLocation.logicalBlockNum = 0;
 440         last_ext->extLocation.partitionReferenceNum = 0;
 441         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 442         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 443                                 (add << sb->s_blocksize_bits);
 444
 445         /* Create enough extents to cover the whole hole */
 446         while (blocks > add) {
 447                 blocks -= add;
 448                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 449                                    last_ext->extLength, 1);
 450                 if (err)
 451                         return err;
 452                 count++;
 453         }
 454         if (blocks) {
 455                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 456                         (blocks << sb->s_blocksize_bits);
 457                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 458                                    last_ext->extLength, 1);
 459                 if (err)
 460                         return err;
 461                 count++;
 462         }
 463
 464 out:
 465         /* Do we have some preallocated blocks saved? */
 466         if (prealloc_len) {
 467                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 468                                    prealloc_len, 1);
 469                 if (err)
 470                         return err;
 471                 last_ext->extLocation = prealloc_loc;
 472                 last_ext->extLength = prealloc_len;
 473                 count++;
 474         }
 475
 476         /* last_pos should point to the last written extent... */
 477         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 478                 last_pos->offset -= sizeof(struct short_ad);
 479         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 480                 last_pos->offset -= sizeof(struct long_ad);
 481         else
 482                 return -EIO;
 483
 484         return count;
 485 }
 486
 487 static int udf_extend_file(struct inode *inode, loff_t newsize)
 488 {
 489
 490         struct extent_position epos;
 491         struct kernel_lb_addr eloc;
 492         uint32_t elen;
 493         int8_t etype;
 494         struct super_block *sb = inode->i_sb;
 495         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 496         int adsize;
 497         struct udf_inode_info *iinfo = UDF_I(inode);
 498         struct kernel_long_ad extent;
 499         int err;
 500
 501         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 502                 adsize = sizeof(struct short_ad);
 503         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 504                 adsize = sizeof(struct long_ad);
 505         else
 506                 BUG();
 507
 508         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 509
 510         /* File has extent covering the new size (could happen when extending
 511          * inside a block)? */
 512         if (etype != -1)
 513                 return 0;
 514         if (newsize & (sb->s_blocksize - 1))
 515                 offset++;
 516         /* Extended file just to the boundary of the last file block? */
 517         if (offset == 0)
 518                 return 0;
 519
 520         /* Truncate is extending the file by 'offset' blocks */
 521         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 522             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 523                 /* File has no extents at all or has empty last
 524                  * indirect extent! Create a fake extent... */
 525                 extent.extLocation.logicalBlockNum = 0;
 526                 extent.extLocation.partitionReferenceNum = 0;
 527                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 528         } else {
 529                 epos.offset -= adsize;
 530                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 531                                       &extent.extLength, 0);
 532                 extent.extLength |= etype << 30;
 533         }
 534         err = udf_do_extend_file(inode, &epos, &extent, offset);
 535         if (err < 0)
 536                 goto out;
 537         err = 0;
 538         iinfo->i_lenExtents = newsize;
 539 out:
 540         brelse(epos.bh);
 541         return err;
 542 }
 543
 544 static struct buffer_head *inode_getblk(struct inode *inode, sector_t block,
 545                                         int *err, sector_t *phys, int *new)
 546 {
 547         static sector_t last_block;
 548         struct buffer_head *result = NULL;
 549         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 550         struct extent_position prev_epos, cur_epos, next_epos;
 551         int count = 0, startnum = 0, endnum = 0;
 552         uint32_t elen = 0, tmpelen;
 553         struct kernel_lb_addr eloc, tmpeloc;
 554         int c = 1;
 555         loff_t lbcount = 0, b_off = 0;
 556         uint32_t newblocknum, newblock;
 557         sector_t offset = 0;
 558         int8_t etype;
 559         struct udf_inode_info *iinfo = UDF_I(inode);
 560         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 561         int lastblock = 0;
 562
 563         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 564         prev_epos.block = iinfo->i_location;
 565         prev_epos.bh = NULL;
 566         cur_epos = next_epos = prev_epos;
 567         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 568
 569         /* find the extent which contains the block we are looking for.
 570            alternate between laarr[0] and laarr[1] for locations of the
 571            current extent, and the previous extent */
 572         do {
 573                 if (prev_epos.bh != cur_epos.bh) {
 574                         brelse(prev_epos.bh);
 575                         get_bh(cur_epos.bh);
 576                         prev_epos.bh = cur_epos.bh;
 577                 }
 578                 if (cur_epos.bh != next_epos.bh) {
 579                         brelse(cur_epos.bh);
 580                         get_bh(next_epos.bh);
 581                         cur_epos.bh = next_epos.bh;
 582                 }
 583
 584                 lbcount += elen;
 585
 586                 prev_epos.block = cur_epos.block;
 587                 cur_epos.block = next_epos.block;
 588
 589                 prev_epos.offset = cur_epos.offset;
 590                 cur_epos.offset = next_epos.offset;
 591
 592                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 593                 if (etype == -1)
 594                         break;
 595
 596                 c = !c;
 597
 598                 laarr[c].extLength = (etype << 30) | elen;
 599                 laarr[c].extLocation = eloc;
 600
 601                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 602                         pgoal = eloc.logicalBlockNum +
 603                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 604                                  inode->i_sb->s_blocksize_bits);
 605
 606                 count++;
 607         } while (lbcount + elen <= b_off);
 608
 609         b_off -= lbcount;
 610         offset = b_off >> inode->i_sb->s_blocksize_bits;
 611         /*
 612          * Move prev_epos and cur_epos into indirect extent if we are at
 613          * the pointer to it
 614          */
 615         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 616         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 617
 618         /* if the extent is allocated and recorded, return the block
 619            if the extent is not a multiple of the blocksize, round up */
 620
 621         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 622                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 623                         elen = EXT_RECORDED_ALLOCATED |
 624                                 ((elen + inode->i_sb->s_blocksize - 1) &
 625                                  ~(inode->i_sb->s_blocksize - 1));
 626                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 627                 }
 628                 brelse(prev_epos.bh);
 629                 brelse(cur_epos.bh);
 630                 brelse(next_epos.bh);
 631                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 632                 *phys = newblock;
 633                 return NULL;
 634         }
 635
 636         last_block = block;
 637         /* Are we beyond EOF? */
 638         if (etype == -1) {
 639                 int ret;
 640
 641                 if (count) {
 642                         if (c)
 643                                 laarr[0] = laarr[1];
 644                         startnum = 1;
 645                 } else {
 646                         /* Create a fake extent when there's not one */
 647                         memset(&laarr[0].extLocation, 0x00,
 648                                 sizeof(struct kernel_lb_addr));
 649                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 650                         /* Will udf_do_extend_file() create real extent from
 651                            a fake one? */
 652                         startnum = (offset > 0);
 653                 }
 654                 /* Create extents for the hole between EOF and offset */
 655                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 656                 if (ret < 0) {
 657                         brelse(prev_epos.bh);
 658                         brelse(cur_epos.bh);
 659                         brelse(next_epos.bh);
 660                         *err = ret;
 661                         return NULL;
 662                 }
 663                 c = 0;
 664                 offset = 0;
 665                 count += ret;
 666                 /* We are not covered by a preallocated extent? */
 667                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 668                                                 EXT_NOT_RECORDED_ALLOCATED) {
 669                         /* Is there any real extent? - otherwise we overwrite
 670                          * the fake one... */
 671                         if (count)
 672                                 c = !c;
 673                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 674                                 inode->i_sb->s_blocksize;
 675                         memset(&laarr[c].extLocation, 0x00,
 676                                 sizeof(struct kernel_lb_addr));
 677                         count++;
 678                         endnum++;
 679                 }
 680                 endnum = c + 1;
 681                 lastblock = 1;
 682         } else {
 683                 endnum = startnum = ((count > 2) ? 2 : count);
 684
 685                 /* if the current extent is in position 0,
 686                    swap it with the previous */
 687                 if (!c && count != 1) {
 688                         laarr[2] = laarr[0];
 689                         laarr[0] = laarr[1];
 690                         laarr[1] = laarr[2];
 691                         c = 1;
 692                 }
 693
 694                 /* if the current block is located in an extent,
 695                    read the next extent */
 696                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 697                 if (etype != -1) {
 698                         laarr[c + 1].extLength = (etype << 30) | elen;
 699                         laarr[c + 1].extLocation = eloc;
 700                         count++;
 701                         startnum++;
 702                         endnum++;
 703                 } else
 704                         lastblock = 1;
 705         }
 706
 707         /* if the current extent is not recorded but allocated, get the
 708          * block in the extent corresponding to the requested block */
 709         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 710                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 711         else { /* otherwise, allocate a new block */
 712                 if (iinfo->i_next_alloc_block == block)
 713                         goal = iinfo->i_next_alloc_goal;
 714
 715                 if (!goal) {
 716                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 717                                 goal = iinfo->i_location.logicalBlockNum + 1;
 718                 }
 719
 720                 newblocknum = udf_new_block(inode->i_sb, inode,
 721                                 iinfo->i_location.partitionReferenceNum,
 722                                 goal, err);
 723                 if (!newblocknum) {
 724                         brelse(prev_epos.bh);
 725                         *err = -ENOSPC;
 726                         return NULL;
 727                 }
 728                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 729         }
 730
 731         /* if the extent the requsted block is located in contains multiple
 732          * blocks, split the extent into at most three extents. blocks prior
 733          * to requested block, requested block, and blocks after requested
 734          * block */
 735         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 736
 737 #ifdef UDF_PREALLOCATE
 738         /* We preallocate blocks only for regular files. It also makes sense
 739          * for directories but there's a problem when to drop the
 740          * preallocation. We might use some delayed work for that but I feel
 741          * it's overengineering for a filesystem like UDF. */
 742         if (S_ISREG(inode->i_mode))
 743                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 744 #endif
 745
 746         /* merge any continuous blocks in laarr */
 747         udf_merge_extents(inode, laarr, &endnum);
 748
 749         /* write back the new extents, inserting new extents if the new number
 750          * of extents is greater than the old number, and deleting extents if
 751          * the new number of extents is less than the old number */
 752         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 753
 754         brelse(prev_epos.bh);
 755
 756         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 757                                 iinfo->i_location.partitionReferenceNum, 0);
 758         if (!newblock)
 759                 return NULL;
 760         *phys = newblock;
 761         *err = 0;
 762         *new = 1;
 763         iinfo->i_next_alloc_block = block;
 764         iinfo->i_next_alloc_goal = newblocknum;
 765         inode->i_ctime = current_fs_time(inode->i_sb);
 766
 767         if (IS_SYNC(inode))
 768                 udf_sync_inode(inode);
 769         else
 770                 mark_inode_dirty(inode);
 771
 772         return result;
 773 }
 774
 775 static void udf_split_extents(struct inode *inode, int *c, int offset,
 776                               int newblocknum,
 777                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 778                               int *endnum)
 779 {
 780         unsigned long blocksize = inode->i_sb->s_blocksize;
 781         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 782
 783         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 784             (laarr[*c].extLength >> 30) ==
 785                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 786                 int curr = *c;
 787                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 788                             blocksize - 1) >> blocksize_bits;
 789                 int8_t etype = (laarr[curr].extLength >> 30);
 790
 791                 if (blen == 1)
 792                         ;
 793                 else if (!offset || blen == offset + 1) {
 794                         laarr[curr + 2] = laarr[curr + 1];
 795                         laarr[curr + 1] = laarr[curr];
 796                 } else {
 797                         laarr[curr + 3] = laarr[curr + 1];
 798                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 799                 }
 800
 801                 if (offset) {
 802                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 803                                 udf_free_blocks(inode->i_sb, inode,
 804                                                 &laarr[curr].extLocation,
 805                                                 0, offset);
 806                                 laarr[curr].extLength =
 807                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 808                                         (offset << blocksize_bits);
 809                                 laarr[curr].extLocation.logicalBlockNum = 0;
 810                                 laarr[curr].extLocation.
 811                                                 partitionReferenceNum = 0;
 812                         } else
 813                                 laarr[curr].extLength = (etype << 30) |
 814                                         (offset << blocksize_bits);
 815                         curr++;
 816                         (*c)++;
 817                         (*endnum)++;
 818                 }
 819
 820                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 821                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 822                         laarr[curr].extLocation.partitionReferenceNum =
 823                                 UDF_I(inode)->i_location.partitionReferenceNum;
 824                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 825                         blocksize;
 826                 curr++;
 827
 828                 if (blen != offset + 1) {
 829                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 830                                 laarr[curr].extLocation.logicalBlockNum +=
 831                                                                 offset + 1;
 832                         laarr[curr].extLength = (etype << 30) |
 833                                 ((blen - (offset + 1)) << blocksize_bits);
 834                         curr++;
 835                         (*endnum)++;
 836                 }
 837         }
 838 }
 839
 840 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 841                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 842                                  int *endnum)
 843 {
 844         int start, length = 0, currlength = 0, i;
 845
 846         if (*endnum >= (c + 1)) {
 847                 if (!lastblock)
 848                         return;
 849                 else
 850                         start = c;
 851         } else {
 852                 if ((laarr[c + 1].extLength >> 30) ==
 853                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 854                         start = c + 1;
 855                         length = currlength =
 856                                 (((laarr[c + 1].extLength &
 857                                         UDF_EXTENT_LENGTH_MASK) +
 858                                 inode->i_sb->s_blocksize - 1) >>
 859                                 inode->i_sb->s_blocksize_bits);
 860                 } else
 861                         start = c;
 862         }
 863
 864         for (i = start + 1; i <= *endnum; i++) {
 865                 if (i == *endnum) {
 866                         if (lastblock)
 867                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 868                 } else if ((laarr[i].extLength >> 30) ==
 869                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 870                         length += (((laarr[i].extLength &
 871                                                 UDF_EXTENT_LENGTH_MASK) +
 872                                     inode->i_sb->s_blocksize - 1) >>
 873                                     inode->i_sb->s_blocksize_bits);
 874                 } else
 875                         break;
 876         }
 877
 878         if (length) {
 879                 int next = laarr[start].extLocation.logicalBlockNum +
 880                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 881                           inode->i_sb->s_blocksize - 1) >>
 882                           inode->i_sb->s_blocksize_bits);
 883                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 884                                 laarr[start].extLocation.partitionReferenceNum,
 885                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 886                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 887                                 currlength);
 888                 if (numalloc)   {
 889                         if (start == (c + 1))
 890                                 laarr[start].extLength +=
 891                                         (numalloc <<
 892                                          inode->i_sb->s_blocksize_bits);
 893                         else {
 894                                 memmove(&laarr[c + 2], &laarr[c + 1],
 895                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 896                                 (*endnum)++;
 897                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 898                                 laarr[c + 1].extLocation.partitionReferenceNum =
 899                                         laarr[c].extLocation.
 900                                                         partitionReferenceNum;
 901                                 laarr[c + 1].extLength =
 902                                         EXT_NOT_RECORDED_ALLOCATED |
 903                                         (numalloc <<
 904                                          inode->i_sb->s_blocksize_bits);
 905                                 start = c + 1;
 906                         }
 907
 908                         for (i = start + 1; numalloc && i < *endnum; i++) {
 909                                 int elen = ((laarr[i].extLength &
 910                                                 UDF_EXTENT_LENGTH_MASK) +
 911                                             inode->i_sb->s_blocksize - 1) >>
 912                                             inode->i_sb->s_blocksize_bits;
 913
 914                                 if (elen > numalloc) {
 915                                         laarr[i].extLength -=
 916                                                 (numalloc <<
 917                                                  inode->i_sb->s_blocksize_bits);
 918                                         numalloc = 0;
 919                                 } else {
 920                                         numalloc -= elen;
 921                                         if (*endnum > (i + 1))
 922                                                 memmove(&laarr[i],
 923                                                         &laarr[i + 1],
 924                                                         sizeof(struct long_ad) *
 925                                                         (*endnum - (i + 1)));
 926                                         i--;
 927                                         (*endnum)--;
 928                                 }
 929                         }
 930                         UDF_I(inode)->i_lenExtents +=
 931                                 numalloc << inode->i_sb->s_blocksize_bits;
 932                 }
 933         }
 934 }
 935
 936 static void udf_merge_extents(struct inode *inode,
 937                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 938                               int *endnum)
 939 {
 940         int i;
 941         unsigned long blocksize = inode->i_sb->s_blocksize;
 942         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 943
 944         for (i = 0; i < (*endnum - 1); i++) {
 945                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 946                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 947
 948                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 949                         (((li->extLength >> 30) ==
 950                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 951                         ((lip1->extLocation.logicalBlockNum -
 952                           li->extLocation.logicalBlockNum) ==
 953                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 954                         blocksize - 1) >> blocksize_bits)))) {
 955
 956                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 957                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 958                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 959                                 lip1->extLength = (lip1->extLength -
 960                                                   (li->extLength &
 961                                                    UDF_EXTENT_LENGTH_MASK) +
 962                                                    UDF_EXTENT_LENGTH_MASK) &
 963                                                         ~(blocksize - 1);
 964                                 li->extLength = (li->extLength &
 965                                                  UDF_EXTENT_FLAG_MASK) +
 966                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 967                                                 blocksize;
 968                                 lip1->extLocation.logicalBlockNum =
 969                                         li->extLocation.logicalBlockNum +
 970                                         ((li->extLength &
 971                                                 UDF_EXTENT_LENGTH_MASK) >>
 972                                                 blocksize_bits);
 973                         } else {
 974                                 li->extLength = lip1->extLength +
 975                                         (((li->extLength &
 976                                                 UDF_EXTENT_LENGTH_MASK) +
 977                                          blocksize - 1) & ~(blocksize - 1));
 978                                 if (*endnum > (i + 2))
 979                                         memmove(&laarr[i + 1], &laarr[i + 2],
 980                                                 sizeof(struct long_ad) *
 981                                                 (*endnum - (i + 2)));
 982                                 i--;
 983                                 (*endnum)--;
 984                         }
 985                 } else if (((li->extLength >> 30) ==
 986                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
 987                            ((lip1->extLength >> 30) ==
 988                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
 989                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
 990                                         ((li->extLength &
 991                                           UDF_EXTENT_LENGTH_MASK) +
 992                                          blocksize - 1) >> blocksize_bits);
 993                         li->extLocation.logicalBlockNum = 0;
 994                         li->extLocation.partitionReferenceNum = 0;
 995
 996                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 997                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 998                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 999                                 lip1->extLength = (lip1->extLength -
1000                                                    (li->extLength &
1001                                                    UDF_EXTENT_LENGTH_MASK) +
1002                                                    UDF_EXTENT_LENGTH_MASK) &
1003                                                    ~(blocksize - 1);
1004                                 li->extLength = (li->extLength &
1005                                                  UDF_EXTENT_FLAG_MASK) +
1006                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1007                                                 blocksize;
1008                         } else {
1009                                 li->extLength = lip1->extLength +
1010                                         (((li->extLength &
1011                                                 UDF_EXTENT_LENGTH_MASK) +
1012                                           blocksize - 1) & ~(blocksize - 1));
1013                                 if (*endnum > (i + 2))
1014                                         memmove(&laarr[i + 1], &laarr[i + 2],
1015                                                 sizeof(struct long_ad) *
1016                                                 (*endnum - (i + 2)));
1017                                 i--;
1018                                 (*endnum)--;
1019                         }
1020                 } else if ((li->extLength >> 30) ==
1021                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1022                         udf_free_blocks(inode->i_sb, inode,
1023                                         &li->extLocation, 0,
1024                                         ((li->extLength &
1025                                                 UDF_EXTENT_LENGTH_MASK) +
1026                                          blocksize - 1) >> blocksize_bits);
1027                         li->extLocation.logicalBlockNum = 0;
1028                         li->extLocation.partitionReferenceNum = 0;
1029                         li->extLength = (li->extLength &
1030                                                 UDF_EXTENT_LENGTH_MASK) |
1031                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1032                 }
1033         }
1034 }
1035
1036 static void udf_update_extents(struct inode *inode,
1037                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1038                                int startnum, int endnum,
1039                                struct extent_position *epos)
1040 {
1041         int start = 0, i;
1042         struct kernel_lb_addr tmploc;
1043         uint32_t tmplen;
1044
1045         if (startnum > endnum) {
1046                 for (i = 0; i < (startnum - endnum); i++)
1047                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1048                                         laarr[i].extLength);
1049         } else if (startnum < endnum) {
1050                 for (i = 0; i < (endnum - startnum); i++) {
1051                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1052                                         laarr[i].extLength);
1053                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1054                                       &laarr[i].extLength, 1);
1055                         start++;
1056                 }
1057         }
1058
1059         for (i = start; i < endnum; i++) {
1060                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1061                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1062                                laarr[i].extLength, 1);
1063         }
1064 }
1065
1066 struct buffer_head *udf_bread(struct inode *inode, int block,
1067                               int create, int *err)
1068 {
1069         struct buffer_head *bh = NULL;
1070
1071         bh = udf_getblk(inode, block, create, err);
1072         if (!bh)
1073                 return NULL;
1074
1075         if (buffer_uptodate(bh))
1076                 return bh;
1077
1078         ll_rw_block(READ, 1, &bh);
1079
1080         wait_on_buffer(bh);
1081         if (buffer_uptodate(bh))
1082                 return bh;
1083
1084         brelse(bh);
1085         *err = -EIO;
1086         return NULL;
1087 }
1088
1089 int udf_setsize(struct inode *inode, loff_t newsize)
1090 {
1091         int err;
1092         struct udf_inode_info *iinfo;
1093         int bsize = 1 << inode->i_blkbits;
1094
1095         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1096               S_ISLNK(inode->i_mode)))
1097                 return -EINVAL;
1098         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1099                 return -EPERM;
1100
1101         iinfo = UDF_I(inode);
1102         if (newsize > inode->i_size) {
1103                 down_write(&iinfo->i_data_sem);
1104                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1105                         if (bsize <
1106                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1107                                 err = udf_expand_file_adinicb(inode);
1108                                 if (err) {
1109                                         up_write(&iinfo->i_data_sem);
1110                                         return err;
1111                                 }
1112                         } else
1113                                 iinfo->i_lenAlloc = newsize;
1114                 }
1115                 err = udf_extend_file(inode, newsize);
1116                 if (err) {
1117                         up_write(&iinfo->i_data_sem);
1118                         return err;
1119                 }
1120                 truncate_setsize(inode, newsize);
1121                 up_write(&iinfo->i_data_sem);
1122         } else {
1123                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1124                         down_write(&iinfo->i_data_sem);
1125                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1126                                0x00, bsize - newsize -
1127                                udf_file_entry_alloc_offset(inode));
1128                         iinfo->i_lenAlloc = newsize;
1129                         truncate_setsize(inode, newsize);
1130                         up_write(&iinfo->i_data_sem);
1131                         goto update_time;
1132                 }
1133                 err = block_truncate_page(inode->i_mapping, newsize,
1134                                           udf_get_block);
1135                 if (err)
1136                         return err;
1137                 down_write(&iinfo->i_data_sem);
1138                 truncate_setsize(inode, newsize);
1139                 udf_truncate_extents(inode);
1140                 up_write(&iinfo->i_data_sem);
1141         }
1142 update_time:
1143         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1144         if (IS_SYNC(inode))
1145                 udf_sync_inode(inode);
1146         else
1147                 mark_inode_dirty(inode);
1148         return 0;
1149 }
1150
1151 static void __udf_read_inode(struct inode *inode)
1152 {
1153         struct buffer_head *bh = NULL;
1154         struct fileEntry *fe;
1155         uint16_t ident;
1156         struct udf_inode_info *iinfo = UDF_I(inode);
1157
1158         /*
1159          * Set defaults, but the inode is still incomplete!
1160          * Note: get_new_inode() sets the following on a new inode:
1161          *      i_sb = sb
1162          *      i_no = ino
1163          *      i_flags = sb->s_flags
1164          *      i_state = 0
1165          * clean_inode(): zero fills and sets
1166          *      i_count = 1
1167          *      i_nlink = 1
1168          *      i_op = NULL;
1169          */
1170         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1171         if (!bh) {
1172                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) failed !bh\n",
1173                        inode->i_ino);
1174                 make_bad_inode(inode);
1175                 return;
1176         }
1177
1178         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1179             ident != TAG_IDENT_USE) {
1180                 printk(KERN_ERR "udf: udf_read_inode(ino %ld) "
1181                                 "failed ident=%d\n", inode->i_ino, ident);
1182                 brelse(bh);
1183                 make_bad_inode(inode);
1184                 return;
1185         }
1186
1187         fe = (struct fileEntry *)bh->b_data;
1188
1189         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1190                 struct buffer_head *ibh;
1191
1192                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1193                                         &ident);
1194                 if (ident == TAG_IDENT_IE && ibh) {
1195                         struct buffer_head *nbh = NULL;
1196                         struct kernel_lb_addr loc;
1197                         struct indirectEntry *ie;
1198
1199                         ie = (struct indirectEntry *)ibh->b_data;
1200                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1201
1202                         if (ie->indirectICB.extLength &&
1203                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1204                                                         &ident))) {
1205                                 if (ident == TAG_IDENT_FE ||
1206                                         ident == TAG_IDENT_EFE) {
1207                                         memcpy(&iinfo->i_location,
1208                                                 &loc,
1209                                                 sizeof(struct kernel_lb_addr));
1210                                         brelse(bh);
1211                                         brelse(ibh);
1212                                         brelse(nbh);
1213                                         __udf_read_inode(inode);
1214                                         return;
1215                                 }
1216                                 brelse(nbh);
1217                         }
1218                 }
1219                 brelse(ibh);
1220         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1221                 printk(KERN_ERR "udf: unsupported strategy type: %d\n",
1222                        le16_to_cpu(fe->icbTag.strategyType));
1223                 brelse(bh);
1224                 make_bad_inode(inode);
1225                 return;
1226         }
1227         udf_fill_inode(inode, bh);
1228
1229         brelse(bh);
1230 }
1231
1232 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1233 {
1234         struct fileEntry *fe;
1235         struct extendedFileEntry *efe;
1236         int offset;
1237         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1238         struct udf_inode_info *iinfo = UDF_I(inode);
1239
1240         fe = (struct fileEntry *)bh->b_data;
1241         efe = (struct extendedFileEntry *)bh->b_data;
1242
1243         if (fe->icbTag.strategyType == cpu_to_le16(4))
1244                 iinfo->i_strat4096 = 0;
1245         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1246                 iinfo->i_strat4096 = 1;
1247
1248         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1249                                                         ICBTAG_FLAG_AD_MASK;
1250         iinfo->i_unique = 0;
1251         iinfo->i_lenEAttr = 0;
1252         iinfo->i_lenExtents = 0;
1253         iinfo->i_lenAlloc = 0;
1254         iinfo->i_next_alloc_block = 0;
1255         iinfo->i_next_alloc_goal = 0;
1256         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1257                 iinfo->i_efe = 1;
1258                 iinfo->i_use = 0;
1259                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1260                                         sizeof(struct extendedFileEntry))) {
1261                         make_bad_inode(inode);
1262                         return;
1263                 }
1264                 memcpy(iinfo->i_ext.i_data,
1265                        bh->b_data + sizeof(struct extendedFileEntry),
1266                        inode->i_sb->s_blocksize -
1267                                         sizeof(struct extendedFileEntry));
1268         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1269                 iinfo->i_efe = 0;
1270                 iinfo->i_use = 0;
1271                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1272                                                 sizeof(struct fileEntry))) {
1273                         make_bad_inode(inode);
1274                         return;
1275                 }
1276                 memcpy(iinfo->i_ext.i_data,
1277                        bh->b_data + sizeof(struct fileEntry),
1278                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1279         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1280                 iinfo->i_efe = 0;
1281                 iinfo->i_use = 1;
1282                 iinfo->i_lenAlloc = le32_to_cpu(
1283                                 ((struct unallocSpaceEntry *)bh->b_data)->
1284                                  lengthAllocDescs);
1285                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1286                                         sizeof(struct unallocSpaceEntry))) {
1287                         make_bad_inode(inode);
1288                         return;
1289                 }
1290                 memcpy(iinfo->i_ext.i_data,
1291                        bh->b_data + sizeof(struct unallocSpaceEntry),
1292                        inode->i_sb->s_blocksize -
1293                                         sizeof(struct unallocSpaceEntry));
1294                 return;
1295         }
1296
1297         read_lock(&sbi->s_cred_lock);
1298         inode->i_uid = le32_to_cpu(fe->uid);
1299         if (inode->i_uid == -1 ||
1300             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1301             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1302                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1303
1304         inode->i_gid = le32_to_cpu(fe->gid);
1305         if (inode->i_gid == -1 ||
1306             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1307             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1308                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1309
1310         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1311                         sbi->s_fmode != UDF_INVALID_MODE)
1312                 inode->i_mode = sbi->s_fmode;
1313         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1314                         sbi->s_dmode != UDF_INVALID_MODE)
1315                 inode->i_mode = sbi->s_dmode;
1316         else
1317                 inode->i_mode = udf_convert_permissions(fe);
1318         inode->i_mode &= ~sbi->s_umask;
1319         read_unlock(&sbi->s_cred_lock);
1320
1321         inode->i_nlink = le16_to_cpu(fe->fileLinkCount);
1322         if (!inode->i_nlink)
1323                 inode->i_nlink = 1;
1324
1325         inode->i_size = le64_to_cpu(fe->informationLength);
1326         iinfo->i_lenExtents = inode->i_size;
1327
1328         if (iinfo->i_efe == 0) {
1329                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1330                         (inode->i_sb->s_blocksize_bits - 9);
1331
1332                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1333                         inode->i_atime = sbi->s_record_time;
1334
1335                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1336                                             fe->modificationTime))
1337                         inode->i_mtime = sbi->s_record_time;
1338
1339                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1340                         inode->i_ctime = sbi->s_record_time;
1341
1342                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1343                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1344                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1345                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1346         } else {
1347                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1348                     (inode->i_sb->s_blocksize_bits - 9);
1349
1350                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1351                         inode->i_atime = sbi->s_record_time;
1352
1353                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1354                                             efe->modificationTime))
1355                         inode->i_mtime = sbi->s_record_time;
1356
1357                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1358                         iinfo->i_crtime = sbi->s_record_time;
1359
1360                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1361                         inode->i_ctime = sbi->s_record_time;
1362
1363                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1364                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1365                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1366                 offset = sizeof(struct extendedFileEntry) +
1367                                                         iinfo->i_lenEAttr;
1368         }
1369
1370         switch (fe->icbTag.fileType) {
1371         case ICBTAG_FILE_TYPE_DIRECTORY:
1372                 inode->i_op = &udf_dir_inode_operations;
1373                 inode->i_fop = &udf_dir_operations;
1374                 inode->i_mode |= S_IFDIR;
1375                 inc_nlink(inode);
1376                 break;
1377         case ICBTAG_FILE_TYPE_REALTIME:
1378         case ICBTAG_FILE_TYPE_REGULAR:
1379         case ICBTAG_FILE_TYPE_UNDEF:
1380         case ICBTAG_FILE_TYPE_VAT20:
1381                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1382                         inode->i_data.a_ops = &udf_adinicb_aops;
1383                 else
1384                         inode->i_data.a_ops = &udf_aops;
1385                 inode->i_op = &udf_file_inode_operations;
1386                 inode->i_fop = &udf_file_operations;
1387                 inode->i_mode |= S_IFREG;
1388                 break;
1389         case ICBTAG_FILE_TYPE_BLOCK:
1390                 inode->i_mode |= S_IFBLK;
1391                 break;
1392         case ICBTAG_FILE_TYPE_CHAR:
1393                 inode->i_mode |= S_IFCHR;
1394                 break;
1395         case ICBTAG_FILE_TYPE_FIFO:
1396                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1397                 break;
1398         case ICBTAG_FILE_TYPE_SOCKET:
1399                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1400                 break;
1401         case ICBTAG_FILE_TYPE_SYMLINK:
1402                 inode->i_data.a_ops = &udf_symlink_aops;
1403                 inode->i_op = &udf_symlink_inode_operations;
1404                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1405                 break;
1406         case ICBTAG_FILE_TYPE_MAIN:
1407                 udf_debug("METADATA FILE-----\n");
1408                 break;
1409         case ICBTAG_FILE_TYPE_MIRROR:
1410                 udf_debug("METADATA MIRROR FILE-----\n");
1411                 break;
1412         case ICBTAG_FILE_TYPE_BITMAP:
1413                 udf_debug("METADATA BITMAP FILE-----\n");
1414                 break;
1415         default:
1416                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
1417                                 "file type=%d\n", inode->i_ino,
1418                                 fe->icbTag.fileType);
1419                 make_bad_inode(inode);
1420                 return;
1421         }
1422         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1423                 struct deviceSpec *dsea =
1424                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1425                 if (dsea) {
1426                         init_special_inode(inode, inode->i_mode,
1427                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1428                                       le32_to_cpu(dsea->minorDeviceIdent)));
1429                         /* Developer ID ??? */
1430                 } else
1431                         make_bad_inode(inode);
1432         }
1433 }
1434
1435 static int udf_alloc_i_data(struct inode *inode, size_t size)
1436 {
1437         struct udf_inode_info *iinfo = UDF_I(inode);
1438         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1439
1440         if (!iinfo->i_ext.i_data) {
1441                 printk(KERN_ERR "udf:udf_alloc_i_data (ino %ld) "
1442                                 "no free memory\n", inode->i_ino);
1443                 return -ENOMEM;
1444         }
1445
1446         return 0;
1447 }
1448
1449 static mode_t udf_convert_permissions(struct fileEntry *fe)
1450 {
1451         mode_t mode;
1452         uint32_t permissions;
1453         uint32_t flags;
1454
1455         permissions = le32_to_cpu(fe->permissions);
1456         flags = le16_to_cpu(fe->icbTag.flags);
1457
1458         mode =  ((permissions) & S_IRWXO) |
1459                 ((permissions >> 2) & S_IRWXG) |
1460                 ((permissions >> 4) & S_IRWXU) |
1461                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1462                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1463                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1464
1465         return mode;
1466 }
1467
1468 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1469 {
1470         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1471 }
1472
1473 static int udf_sync_inode(struct inode *inode)
1474 {
1475         return udf_update_inode(inode, 1);
1476 }
1477
1478 static int udf_update_inode(struct inode *inode, int do_sync)
1479 {
1480         struct buffer_head *bh = NULL;
1481         struct fileEntry *fe;
1482         struct extendedFileEntry *efe;
1483         uint32_t udfperms;
1484         uint16_t icbflags;
1485         uint16_t crclen;
1486         int err = 0;
1487         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1488         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1489         struct udf_inode_info *iinfo = UDF_I(inode);
1490
1491         bh = udf_tgetblk(inode->i_sb,
1492                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1493         if (!bh) {
1494                 udf_debug("getblk failure\n");
1495                 return -ENOMEM;
1496         }
1497
1498         lock_buffer(bh);
1499         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1500         fe = (struct fileEntry *)bh->b_data;
1501         efe = (struct extendedFileEntry *)bh->b_data;
1502
1503         if (iinfo->i_use) {
1504                 struct unallocSpaceEntry *use =
1505                         (struct unallocSpaceEntry *)bh->b_data;
1506
1507                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1508                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1509                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1510                                         sizeof(struct unallocSpaceEntry));
1511                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1512                 use->descTag.tagLocation =
1513                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1514                 crclen = sizeof(struct unallocSpaceEntry) +
1515                                 iinfo->i_lenAlloc - sizeof(struct tag);
1516                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1517                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1518                                                            sizeof(struct tag),
1519                                                            crclen));
1520                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1521
1522                 goto out;
1523         }
1524
1525         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1526                 fe->uid = cpu_to_le32(-1);
1527         else
1528                 fe->uid = cpu_to_le32(inode->i_uid);
1529
1530         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1531                 fe->gid = cpu_to_le32(-1);
1532         else
1533                 fe->gid = cpu_to_le32(inode->i_gid);
1534
1535         udfperms = ((inode->i_mode & S_IRWXO)) |
1536                    ((inode->i_mode & S_IRWXG) << 2) |
1537                    ((inode->i_mode & S_IRWXU) << 4);
1538
1539         udfperms |= (le32_to_cpu(fe->permissions) &
1540                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1541                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1542                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1543         fe->permissions = cpu_to_le32(udfperms);
1544
1545         if (S_ISDIR(inode->i_mode))
1546                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1547         else
1548                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1549
1550         fe->informationLength = cpu_to_le64(inode->i_size);
1551
1552         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1553                 struct regid *eid;
1554                 struct deviceSpec *dsea =
1555                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1556                 if (!dsea) {
1557                         dsea = (struct deviceSpec *)
1558                                 udf_add_extendedattr(inode,
1559                                                      sizeof(struct deviceSpec) +
1560                                                      sizeof(struct regid), 12, 0x3);
1561                         dsea->attrType = cpu_to_le32(12);
1562                         dsea->attrSubtype = 1;
1563                         dsea->attrLength = cpu_to_le32(
1564                                                 sizeof(struct deviceSpec) +
1565                                                 sizeof(struct regid));
1566                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1567                 }
1568                 eid = (struct regid *)dsea->impUse;
1569                 memset(eid, 0, sizeof(struct regid));
1570                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1571                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1572                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1573                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1574                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1575         }
1576
1577         if (iinfo->i_efe == 0) {
1578                 memcpy(bh->b_data + sizeof(struct fileEntry),
1579                        iinfo->i_ext.i_data,
1580                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1581                 fe->logicalBlocksRecorded = cpu_to_le64(
1582                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1583                         (blocksize_bits - 9));
1584
1585                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1586                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1587                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1588                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1589                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1590                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1591                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1592                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1593                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1594                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1595                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1596                 crclen = sizeof(struct fileEntry);
1597         } else {
1598                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1599                        iinfo->i_ext.i_data,
1600                        inode->i_sb->s_blocksize -
1601                                         sizeof(struct extendedFileEntry));
1602                 efe->objectSize = cpu_to_le64(inode->i_size);
1603                 efe->logicalBlocksRecorded = cpu_to_le64(
1604                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1605                         (blocksize_bits - 9));
1606
1607                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1608                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1609                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1610                         iinfo->i_crtime = inode->i_atime;
1611
1612                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1613                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1614                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1615                         iinfo->i_crtime = inode->i_mtime;
1616
1617                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1618                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1619                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1620                         iinfo->i_crtime = inode->i_ctime;
1621
1622                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1623                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1624                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1625                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1626
1627                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1628                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1629                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1630                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1631                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1632                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1633                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1634                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1635                 crclen = sizeof(struct extendedFileEntry);
1636         }
1637         if (iinfo->i_strat4096) {
1638                 fe->icbTag.strategyType = cpu_to_le16(4096);
1639                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1640                 fe->icbTag.numEntries = cpu_to_le16(2);
1641         } else {
1642                 fe->icbTag.strategyType = cpu_to_le16(4);
1643                 fe->icbTag.numEntries = cpu_to_le16(1);
1644         }
1645
1646         if (S_ISDIR(inode->i_mode))
1647                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1648         else if (S_ISREG(inode->i_mode))
1649                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1650         else if (S_ISLNK(inode->i_mode))
1651                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1652         else if (S_ISBLK(inode->i_mode))
1653                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1654         else if (S_ISCHR(inode->i_mode))
1655                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1656         else if (S_ISFIFO(inode->i_mode))
1657                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1658         else if (S_ISSOCK(inode->i_mode))
1659                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1660
1661         icbflags =      iinfo->i_alloc_type |
1662                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1663                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1664                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1665                         (le16_to_cpu(fe->icbTag.flags) &
1666                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1667                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1668
1669         fe->icbTag.flags = cpu_to_le16(icbflags);
1670         if (sbi->s_udfrev >= 0x0200)
1671                 fe->descTag.descVersion = cpu_to_le16(3);
1672         else
1673                 fe->descTag.descVersion = cpu_to_le16(2);
1674         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1675         fe->descTag.tagLocation = cpu_to_le32(
1676                                         iinfo->i_location.logicalBlockNum);
1677         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1678         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1679         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1680                                                   crclen));
1681         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1682
1683 out:
1684         set_buffer_uptodate(bh);
1685         unlock_buffer(bh);
1686
1687         /* write the data blocks */
1688         mark_buffer_dirty(bh);
1689         if (do_sync) {
1690                 sync_dirty_buffer(bh);
1691                 if (buffer_write_io_error(bh)) {
1692                         printk(KERN_WARNING "IO error syncing udf inode "
1693                                 "[%s:%08lx]\n", inode->i_sb->s_id,
1694                                 inode->i_ino);
1695                         err = -EIO;
1696                 }
1697         }
1698         brelse(bh);
1699
1700         return err;
1701 }
1702
1703 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1704 {
1705         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1706         struct inode *inode = iget_locked(sb, block);
1707
1708         if (!inode)
1709                 return NULL;
1710
1711         if (inode->i_state & I_NEW) {
1712                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1713                 __udf_read_inode(inode);
1714                 unlock_new_inode(inode);
1715         }
1716
1717         if (is_bad_inode(inode))
1718                 goto out_iput;
1719
1720         if (ino->logicalBlockNum >= UDF_SB(sb)->
1721                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1722                 udf_debug("block=%d, partition=%d out of range\n",
1723                           ino->logicalBlockNum, ino->partitionReferenceNum);
1724                 make_bad_inode(inode);
1725                 goto out_iput;
1726         }
1727
1728         return inode;
1729
1730  out_iput:
1731         iput(inode);
1732         return NULL;
1733 }
1734
1735 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1736                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1737 {
1738         int adsize;
1739         struct short_ad *sad = NULL;
1740         struct long_ad *lad = NULL;
1741         struct allocExtDesc *aed;
1742         uint8_t *ptr;
1743         struct udf_inode_info *iinfo = UDF_I(inode);
1744
1745         if (!epos->bh)
1746                 ptr = iinfo->i_ext.i_data + epos->offset -
1747                         udf_file_entry_alloc_offset(inode) +
1748                         iinfo->i_lenEAttr;
1749         else
1750                 ptr = epos->bh->b_data + epos->offset;
1751
1752         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1753                 adsize = sizeof(struct short_ad);
1754         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1755                 adsize = sizeof(struct long_ad);
1756         else
1757                 return -EIO;
1758
1759         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1760                 unsigned char *sptr, *dptr;
1761                 struct buffer_head *nbh;
1762                 int err, loffset;
1763                 struct kernel_lb_addr obloc = epos->block;
1764
1765                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1766                                                 obloc.partitionReferenceNum,
1767                                                 obloc.logicalBlockNum, &err);
1768                 if (!epos->block.logicalBlockNum)
1769                         return -ENOSPC;
1770                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1771                                                                  &epos->block,
1772                                                                  0));
1773                 if (!nbh)
1774                         return -EIO;
1775                 lock_buffer(nbh);
1776                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1777                 set_buffer_uptodate(nbh);
1778                 unlock_buffer(nbh);
1779                 mark_buffer_dirty_inode(nbh, inode);
1780
1781                 aed = (struct allocExtDesc *)(nbh->b_data);
1782                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1783                         aed->previousAllocExtLocation =
1784                                         cpu_to_le32(obloc.logicalBlockNum);
1785                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1786                         loffset = epos->offset;
1787                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1788                         sptr = ptr - adsize;
1789                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1790                         memcpy(dptr, sptr, adsize);
1791                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1792                 } else {
1793                         loffset = epos->offset + adsize;
1794                         aed->lengthAllocDescs = cpu_to_le32(0);
1795                         sptr = ptr;
1796                         epos->offset = sizeof(struct allocExtDesc);
1797
1798                         if (epos->bh) {
1799                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1800                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1801                         } else {
1802                                 iinfo->i_lenAlloc += adsize;
1803                                 mark_inode_dirty(inode);
1804                         }
1805                 }
1806                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1807                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1808                                     epos->block.logicalBlockNum, sizeof(struct tag));
1809                 else
1810                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1811                                     epos->block.logicalBlockNum, sizeof(struct tag));
1812                 switch (iinfo->i_alloc_type) {
1813                 case ICBTAG_FLAG_AD_SHORT:
1814                         sad = (struct short_ad *)sptr;
1815                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1816                                                      inode->i_sb->s_blocksize);
1817                         sad->extPosition =
1818                                 cpu_to_le32(epos->block.logicalBlockNum);
1819                         break;
1820                 case ICBTAG_FLAG_AD_LONG:
1821                         lad = (struct long_ad *)sptr;
1822                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1823                                                      inode->i_sb->s_blocksize);
1824                         lad->extLocation = cpu_to_lelb(epos->block);
1825                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1826                         break;
1827                 }
1828                 if (epos->bh) {
1829                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1830                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1831                                 udf_update_tag(epos->bh->b_data, loffset);
1832                         else
1833                                 udf_update_tag(epos->bh->b_data,
1834                                                 sizeof(struct allocExtDesc));
1835                         mark_buffer_dirty_inode(epos->bh, inode);
1836                         brelse(epos->bh);
1837                 } else {
1838                         mark_inode_dirty(inode);
1839                 }
1840                 epos->bh = nbh;
1841         }
1842
1843         udf_write_aext(inode, epos, eloc, elen, inc);
1844
1845         if (!epos->bh) {
1846                 iinfo->i_lenAlloc += adsize;
1847                 mark_inode_dirty(inode);
1848         } else {
1849                 aed = (struct allocExtDesc *)epos->bh->b_data;
1850                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1851                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1852                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1853                         udf_update_tag(epos->bh->b_data,
1854                                         epos->offset + (inc ? 0 : adsize));
1855                 else
1856                         udf_update_tag(epos->bh->b_data,
1857                                         sizeof(struct allocExtDesc));
1858                 mark_buffer_dirty_inode(epos->bh, inode);
1859         }
1860
1861         return 0;
1862 }
1863
1864 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1865                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1866 {
1867         int adsize;
1868         uint8_t *ptr;
1869         struct short_ad *sad;
1870         struct long_ad *lad;
1871         struct udf_inode_info *iinfo = UDF_I(inode);
1872
1873         if (!epos->bh)
1874                 ptr = iinfo->i_ext.i_data + epos->offset -
1875                         udf_file_entry_alloc_offset(inode) +
1876                         iinfo->i_lenEAttr;
1877         else
1878                 ptr = epos->bh->b_data + epos->offset;
1879
1880         switch (iinfo->i_alloc_type) {
1881         case ICBTAG_FLAG_AD_SHORT:
1882                 sad = (struct short_ad *)ptr;
1883                 sad->extLength = cpu_to_le32(elen);
1884                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1885                 adsize = sizeof(struct short_ad);
1886                 break;
1887         case ICBTAG_FLAG_AD_LONG:
1888                 lad = (struct long_ad *)ptr;
1889                 lad->extLength = cpu_to_le32(elen);
1890                 lad->extLocation = cpu_to_lelb(*eloc);
1891                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1892                 adsize = sizeof(struct long_ad);
1893                 break;
1894         default:
1895                 return;
1896         }
1897
1898         if (epos->bh) {
1899                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1900                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1901                         struct allocExtDesc *aed =
1902                                 (struct allocExtDesc *)epos->bh->b_data;
1903                         udf_update_tag(epos->bh->b_data,
1904                                        le32_to_cpu(aed->lengthAllocDescs) +
1905                                        sizeof(struct allocExtDesc));
1906                 }
1907                 mark_buffer_dirty_inode(epos->bh, inode);
1908         } else {
1909                 mark_inode_dirty(inode);
1910         }
1911
1912         if (inc)
1913                 epos->offset += adsize;
1914 }
1915
1916 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1917                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1918 {
1919         int8_t etype;
1920
1921         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1922                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1923                 int block;
1924                 epos->block = *eloc;
1925                 epos->offset = sizeof(struct allocExtDesc);
1926                 brelse(epos->bh);
1927                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1928                 epos->bh = udf_tread(inode->i_sb, block);
1929                 if (!epos->bh) {
1930                         udf_debug("reading block %d failed!\n", block);
1931                         return -1;
1932                 }
1933         }
1934
1935         return etype;
1936 }
1937
1938 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1939                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1940 {
1941         int alen;
1942         int8_t etype;
1943         uint8_t *ptr;
1944         struct short_ad *sad;
1945         struct long_ad *lad;
1946         struct udf_inode_info *iinfo = UDF_I(inode);
1947
1948         if (!epos->bh) {
1949                 if (!epos->offset)
1950                         epos->offset = udf_file_entry_alloc_offset(inode);
1951                 ptr = iinfo->i_ext.i_data + epos->offset -
1952                         udf_file_entry_alloc_offset(inode) +
1953                         iinfo->i_lenEAttr;
1954                 alen = udf_file_entry_alloc_offset(inode) +
1955                                                         iinfo->i_lenAlloc;
1956         } else {
1957                 if (!epos->offset)
1958                         epos->offset = sizeof(struct allocExtDesc);
1959                 ptr = epos->bh->b_data + epos->offset;
1960                 alen = sizeof(struct allocExtDesc) +
1961                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1962                                                         lengthAllocDescs);
1963         }
1964
1965         switch (iinfo->i_alloc_type) {
1966         case ICBTAG_FLAG_AD_SHORT:
1967                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1968                 if (!sad)
1969                         return -1;
1970                 etype = le32_to_cpu(sad->extLength) >> 30;
1971                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1972                 eloc->partitionReferenceNum =
1973                                 iinfo->i_location.partitionReferenceNum;
1974                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1975                 break;
1976         case ICBTAG_FLAG_AD_LONG:
1977                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1978                 if (!lad)
1979                         return -1;
1980                 etype = le32_to_cpu(lad->extLength) >> 30;
1981                 *eloc = lelb_to_cpu(lad->extLocation);
1982                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
1983                 break;
1984         default:
1985                 udf_debug("alloc_type = %d unsupported\n",
1986                                 iinfo->i_alloc_type);
1987                 return -1;
1988         }
1989
1990         return etype;
1991 }
1992
1993 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
1994                               struct kernel_lb_addr neloc, uint32_t nelen)
1995 {
1996         struct kernel_lb_addr oeloc;
1997         uint32_t oelen;
1998         int8_t etype;
1999
2000         if (epos.bh)
2001                 get_bh(epos.bh);
2002
2003         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2004                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2005                 neloc = oeloc;
2006                 nelen = (etype << 30) | oelen;
2007         }
2008         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2009         brelse(epos.bh);
2010
2011         return (nelen >> 30);
2012 }
2013
2014 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2015                        struct kernel_lb_addr eloc, uint32_t elen)
2016 {
2017         struct extent_position oepos;
2018         int adsize;
2019         int8_t etype;
2020         struct allocExtDesc *aed;
2021         struct udf_inode_info *iinfo;
2022
2023         if (epos.bh) {
2024                 get_bh(epos.bh);
2025                 get_bh(epos.bh);
2026         }
2027
2028         iinfo = UDF_I(inode);
2029         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2030                 adsize = sizeof(struct short_ad);
2031         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2032                 adsize = sizeof(struct long_ad);
2033         else
2034                 adsize = 0;
2035
2036         oepos = epos;
2037         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2038                 return -1;
2039
2040         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2041                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2042                 if (oepos.bh != epos.bh) {
2043                         oepos.block = epos.block;
2044                         brelse(oepos.bh);
2045                         get_bh(epos.bh);
2046                         oepos.bh = epos.bh;
2047                         oepos.offset = epos.offset - adsize;
2048                 }
2049         }
2050         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2051         elen = 0;
2052
2053         if (epos.bh != oepos.bh) {
2054                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2055                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2056                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2057                 if (!oepos.bh) {
2058                         iinfo->i_lenAlloc -= (adsize * 2);
2059                         mark_inode_dirty(inode);
2060                 } else {
2061                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2062                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2063                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2064                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2065                                 udf_update_tag(oepos.bh->b_data,
2066                                                 oepos.offset - (2 * adsize));
2067                         else
2068                                 udf_update_tag(oepos.bh->b_data,
2069                                                 sizeof(struct allocExtDesc));
2070                         mark_buffer_dirty_inode(oepos.bh, inode);
2071                 }
2072         } else {
2073                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2074                 if (!oepos.bh) {
2075                         iinfo->i_lenAlloc -= adsize;
2076                         mark_inode_dirty(inode);
2077                 } else {
2078                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2079                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2080                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2081                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2082                                 udf_update_tag(oepos.bh->b_data,
2083                                                 epos.offset - adsize);
2084                         else
2085                                 udf_update_tag(oepos.bh->b_data,
2086                                                 sizeof(struct allocExtDesc));
2087                         mark_buffer_dirty_inode(oepos.bh, inode);
2088                 }
2089         }
2090
2091         brelse(epos.bh);
2092         brelse(oepos.bh);
2093
2094         return (elen >> 30);
2095 }
2096
2097 int8_t inode_bmap(struct inode *inode, sector_t block,
2098                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2099                   uint32_t *elen, sector_t *offset)
2100 {
2101         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2102         loff_t lbcount = 0, bcount =
2103             (loff_t) block << blocksize_bits;
2104         int8_t etype;
2105         struct udf_inode_info *iinfo;
2106
2107         iinfo = UDF_I(inode);
2108         pos->offset = 0;
2109         pos->block = iinfo->i_location;
2110         pos->bh = NULL;
2111         *elen = 0;
2112
2113         do {
2114                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2115                 if (etype == -1) {
2116                         *offset = (bcount - lbcount) >> blocksize_bits;
2117                         iinfo->i_lenExtents = lbcount;
2118                         return -1;
2119                 }
2120                 lbcount += *elen;
2121         } while (lbcount <= bcount);
2122
2123         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2124
2125         return etype;
2126 }
2127
2128 long udf_block_map(struct inode *inode, sector_t block)
2129 {
2130         struct kernel_lb_addr eloc;
2131         uint32_t elen;
2132         sector_t offset;
2133         struct extent_position epos = {};
2134         int ret;
2135
2136         down_read(&UDF_I(inode)->i_data_sem);
2137
2138         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2139                                                 (EXT_RECORDED_ALLOCATED >> 30))
2140                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2141         else
2142                 ret = 0;
2143
2144         up_read(&UDF_I(inode)->i_data_sem);
2145         brelse(epos.bh);
2146
2147         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2148                 return udf_fixed_to_variable(ret);
2149         else
2150                 return ret;
2151 }