fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38 #include <linux/slab.h>
  39 #include <linux/crc-itu-t.h>
  40 #include <linux/mpage.h>
  41 #include <linux/aio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 MODULE_AUTHOR("Ben Fennema");
  47 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  48 MODULE_LICENSE("GPL");
  49
  50 #define EXTENT_MERGE_SIZE 5
  51
  52 static umode_t udf_convert_permissions(struct fileEntry *);
  53 static int udf_update_inode(struct inode *, int);
  54 static void udf_fill_inode(struct inode *, struct buffer_head *);
  55 static int udf_sync_inode(struct inode *inode);
  56 static int udf_alloc_i_data(struct inode *inode, size_t size);
  57 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  58 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  59                               struct kernel_lb_addr, uint32_t);
  60 static void udf_split_extents(struct inode *, int *, int, int,
  61                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  62 static void udf_prealloc_extents(struct inode *, int, int,
  63                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  64 static void udf_merge_extents(struct inode *,
  65                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  66 static void udf_update_extents(struct inode *,
  67                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  68                                struct extent_position *);
  69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  70
  71 static void __udf_clear_extent_cache(struct inode *inode)
  72 {
  73         struct udf_inode_info *iinfo = UDF_I(inode);
  74
  75         if (iinfo->cached_extent.lstart != -1) {
  76                 brelse(iinfo->cached_extent.epos.bh);
  77                 iinfo->cached_extent.lstart = -1;
  78         }
  79 }
  80
  81 /* Invalidate extent cache */
  82 static void udf_clear_extent_cache(struct inode *inode)
  83 {
  84         struct udf_inode_info *iinfo = UDF_I(inode);
  85
  86         spin_lock(&iinfo->i_extent_cache_lock);
  87         __udf_clear_extent_cache(inode);
  88         spin_unlock(&iinfo->i_extent_cache_lock);
  89 }
  90
  91 /* Return contents of extent cache */
  92 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  93                                  loff_t *lbcount, struct extent_position *pos)
  94 {
  95         struct udf_inode_info *iinfo = UDF_I(inode);
  96         int ret = 0;
  97
  98         spin_lock(&iinfo->i_extent_cache_lock);
  99         if ((iinfo->cached_extent.lstart <= bcount) &&
 100             (iinfo->cached_extent.lstart != -1)) {
 101                 /* Cache hit */
 102                 *lbcount = iinfo->cached_extent.lstart;
 103                 memcpy(pos, &iinfo->cached_extent.epos,
 104                        sizeof(struct extent_position));
 105                 if (pos->bh)
 106                         get_bh(pos->bh);
 107                 ret = 1;
 108         }
 109         spin_unlock(&iinfo->i_extent_cache_lock);
 110         return ret;
 111 }
 112
 113 /* Add extent to extent cache */
 114 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 115                                     struct extent_position *pos, int next_epos)
 116 {
 117         struct udf_inode_info *iinfo = UDF_I(inode);
 118
 119         spin_lock(&iinfo->i_extent_cache_lock);
 120         /* Invalidate previously cached extent */
 121         __udf_clear_extent_cache(inode);
 122         if (pos->bh)
 123                 get_bh(pos->bh);
 124         memcpy(&iinfo->cached_extent.epos, pos,
 125                sizeof(struct extent_position));
 126         iinfo->cached_extent.lstart = estart;
 127         if (next_epos)
 128                 switch (iinfo->i_alloc_type) {
 129                 case ICBTAG_FLAG_AD_SHORT:
 130                         iinfo->cached_extent.epos.offset -=
 131                         sizeof(struct short_ad);
 132                         break;
 133                 case ICBTAG_FLAG_AD_LONG:
 134                         iinfo->cached_extent.epos.offset -=
 135                         sizeof(struct long_ad);
 136                 }
 137         spin_unlock(&iinfo->i_extent_cache_lock);
 138 }
 139
 140 void udf_evict_inode(struct inode *inode)
 141 {
 142         struct udf_inode_info *iinfo = UDF_I(inode);
 143         int want_delete = 0;
 144
 145         if (!inode->i_nlink && !is_bad_inode(inode)) {
 146                 want_delete = 1;
 147                 udf_setsize(inode, 0);
 148                 udf_update_inode(inode, IS_SYNC(inode));
 149         }
 150         truncate_inode_pages_final(&inode->i_data);
 151         invalidate_inode_buffers(inode);
 152         clear_inode(inode);
 153         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 154             inode->i_size != iinfo->i_lenExtents) {
 155                 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 156                          inode->i_ino, inode->i_mode,
 157                          (unsigned long long)inode->i_size,
 158                          (unsigned long long)iinfo->i_lenExtents);
 159         }
 160         kfree(iinfo->i_ext.i_data);
 161         iinfo->i_ext.i_data = NULL;
 162         udf_clear_extent_cache(inode);
 163         if (want_delete) {
 164                 udf_free_inode(inode);
 165         }
 166 }
 167
 168 static void udf_write_failed(struct address_space *mapping, loff_t to)
 169 {
 170         struct inode *inode = mapping->host;
 171         struct udf_inode_info *iinfo = UDF_I(inode);
 172         loff_t isize = inode->i_size;
 173
 174         if (to > isize) {
 175                 truncate_pagecache(inode, isize);
 176                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 177                         down_write(&iinfo->i_data_sem);
 178                         udf_clear_extent_cache(inode);
 179                         udf_truncate_extents(inode);
 180                         up_write(&iinfo->i_data_sem);
 181                 }
 182         }
 183 }
 184
 185 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 186 {
 187         return block_write_full_page(page, udf_get_block, wbc);
 188 }
 189
 190 static int udf_writepages(struct address_space *mapping,
 191                         struct writeback_control *wbc)
 192 {
 193         return mpage_writepages(mapping, wbc, udf_get_block);
 194 }
 195
 196 static int udf_readpage(struct file *file, struct page *page)
 197 {
 198         return mpage_readpage(page, udf_get_block);
 199 }
 200
 201 static int udf_readpages(struct file *file, struct address_space *mapping,
 202                         struct list_head *pages, unsigned nr_pages)
 203 {
 204         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 205 }
 206
 207 static int udf_write_begin(struct file *file, struct address_space *mapping,
 208                         loff_t pos, unsigned len, unsigned flags,
 209                         struct page **pagep, void **fsdata)
 210 {
 211         int ret;
 212
 213         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 214         if (unlikely(ret))
 215                 udf_write_failed(mapping, pos + len);
 216         return ret;
 217 }
 218
 219 static ssize_t udf_direct_IO(int rw, struct kiocb *iocb,
 220                              const struct iovec *iov,
 221                              loff_t offset, unsigned long nr_segs)
 222 {
 223         struct file *file = iocb->ki_filp;
 224         struct address_space *mapping = file->f_mapping;
 225         struct inode *inode = mapping->host;
 226         ssize_t ret;
 227
 228         ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
 229                                   udf_get_block);
 230         if (unlikely(ret < 0 && (rw & WRITE)))
 231                 udf_write_failed(mapping, offset + iov_length(iov, nr_segs));
 232         return ret;
 233 }
 234
 235 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 236 {
 237         return generic_block_bmap(mapping, block, udf_get_block);
 238 }
 239
 240 const struct address_space_operations udf_aops = {
 241         .readpage       = udf_readpage,
 242         .readpages      = udf_readpages,
 243         .writepage      = udf_writepage,
 244         .writepages     = udf_writepages,
 245         .write_begin    = udf_write_begin,
 246         .write_end      = generic_write_end,
 247         .direct_IO      = udf_direct_IO,
 248         .bmap           = udf_bmap,
 249 };
 250
 251 /*
 252  * Expand file stored in ICB to a normal one-block-file
 253  *
 254  * This function requires i_data_sem for writing and releases it.
 255  * This function requires i_mutex held
 256  */
 257 int udf_expand_file_adinicb(struct inode *inode)
 258 {
 259         struct page *page;
 260         char *kaddr;
 261         struct udf_inode_info *iinfo = UDF_I(inode);
 262         int err;
 263         struct writeback_control udf_wbc = {
 264                 .sync_mode = WB_SYNC_NONE,
 265                 .nr_to_write = 1,
 266         };
 267
 268         WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
 269         if (!iinfo->i_lenAlloc) {
 270                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 271                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 272                 else
 273                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 274                 /* from now on we have normal address_space methods */
 275                 inode->i_data.a_ops = &udf_aops;
 276                 up_write(&iinfo->i_data_sem);
 277                 mark_inode_dirty(inode);
 278                 return 0;
 279         }
 280         /*
 281          * Release i_data_sem so that we can lock a page - page lock ranks
 282          * above i_data_sem. i_mutex still protects us against file changes.
 283          */
 284         up_write(&iinfo->i_data_sem);
 285
 286         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 287         if (!page)
 288                 return -ENOMEM;
 289
 290         if (!PageUptodate(page)) {
 291                 kaddr = kmap(page);
 292                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 293                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 294                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 295                         iinfo->i_lenAlloc);
 296                 flush_dcache_page(page);
 297                 SetPageUptodate(page);
 298                 kunmap(page);
 299         }
 300         down_write(&iinfo->i_data_sem);
 301         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 302                iinfo->i_lenAlloc);
 303         iinfo->i_lenAlloc = 0;
 304         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 305                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 306         else
 307                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 308         /* from now on we have normal address_space methods */
 309         inode->i_data.a_ops = &udf_aops;
 310         up_write(&iinfo->i_data_sem);
 311         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 312         if (err) {
 313                 /* Restore everything back so that we don't lose data... */
 314                 lock_page(page);
 315                 kaddr = kmap(page);
 316                 down_write(&iinfo->i_data_sem);
 317                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 318                        inode->i_size);
 319                 kunmap(page);
 320                 unlock_page(page);
 321                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 322                 inode->i_data.a_ops = &udf_adinicb_aops;
 323                 up_write(&iinfo->i_data_sem);
 324         }
 325         page_cache_release(page);
 326         mark_inode_dirty(inode);
 327
 328         return err;
 329 }
 330
 331 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 332                                            int *err)
 333 {
 334         int newblock;
 335         struct buffer_head *dbh = NULL;
 336         struct kernel_lb_addr eloc;
 337         uint8_t alloctype;
 338         struct extent_position epos;
 339
 340         struct udf_fileident_bh sfibh, dfibh;
 341         loff_t f_pos = udf_ext0_offset(inode);
 342         int size = udf_ext0_offset(inode) + inode->i_size;
 343         struct fileIdentDesc cfi, *sfi, *dfi;
 344         struct udf_inode_info *iinfo = UDF_I(inode);
 345
 346         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 347                 alloctype = ICBTAG_FLAG_AD_SHORT;
 348         else
 349                 alloctype = ICBTAG_FLAG_AD_LONG;
 350
 351         if (!inode->i_size) {
 352                 iinfo->i_alloc_type = alloctype;
 353                 mark_inode_dirty(inode);
 354                 return NULL;
 355         }
 356
 357         /* alloc block, and copy data to it */
 358         *block = udf_new_block(inode->i_sb, inode,
 359                                iinfo->i_location.partitionReferenceNum,
 360                                iinfo->i_location.logicalBlockNum, err);
 361         if (!(*block))
 362                 return NULL;
 363         newblock = udf_get_pblock(inode->i_sb, *block,
 364                                   iinfo->i_location.partitionReferenceNum,
 365                                 0);
 366         if (!newblock)
 367                 return NULL;
 368         dbh = udf_tgetblk(inode->i_sb, newblock);
 369         if (!dbh)
 370                 return NULL;
 371         lock_buffer(dbh);
 372         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 373         set_buffer_uptodate(dbh);
 374         unlock_buffer(dbh);
 375         mark_buffer_dirty_inode(dbh, inode);
 376
 377         sfibh.soffset = sfibh.eoffset =
 378                         f_pos & (inode->i_sb->s_blocksize - 1);
 379         sfibh.sbh = sfibh.ebh = NULL;
 380         dfibh.soffset = dfibh.eoffset = 0;
 381         dfibh.sbh = dfibh.ebh = dbh;
 382         while (f_pos < size) {
 383                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 384                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 385                                          NULL, NULL, NULL);
 386                 if (!sfi) {
 387                         brelse(dbh);
 388                         return NULL;
 389                 }
 390                 iinfo->i_alloc_type = alloctype;
 391                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 392                 dfibh.soffset = dfibh.eoffset;
 393                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 394                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 395                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 396                                  sfi->fileIdent +
 397                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 398                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 399                         brelse(dbh);
 400                         return NULL;
 401                 }
 402         }
 403         mark_buffer_dirty_inode(dbh, inode);
 404
 405         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 406                 iinfo->i_lenAlloc);
 407         iinfo->i_lenAlloc = 0;
 408         eloc.logicalBlockNum = *block;
 409         eloc.partitionReferenceNum =
 410                                 iinfo->i_location.partitionReferenceNum;
 411         iinfo->i_lenExtents = inode->i_size;
 412         epos.bh = NULL;
 413         epos.block = iinfo->i_location;
 414         epos.offset = udf_file_entry_alloc_offset(inode);
 415         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 416         /* UniqueID stuff */
 417
 418         brelse(epos.bh);
 419         mark_inode_dirty(inode);
 420         return dbh;
 421 }
 422
 423 static int udf_get_block(struct inode *inode, sector_t block,
 424                          struct buffer_head *bh_result, int create)
 425 {
 426         int err, new;
 427         sector_t phys = 0;
 428         struct udf_inode_info *iinfo;
 429
 430         if (!create) {
 431                 phys = udf_block_map(inode, block);
 432                 if (phys)
 433                         map_bh(bh_result, inode->i_sb, phys);
 434                 return 0;
 435         }
 436
 437         err = -EIO;
 438         new = 0;
 439         iinfo = UDF_I(inode);
 440
 441         down_write(&iinfo->i_data_sem);
 442         if (block == iinfo->i_next_alloc_block + 1) {
 443                 iinfo->i_next_alloc_block++;
 444                 iinfo->i_next_alloc_goal++;
 445         }
 446
 447         udf_clear_extent_cache(inode);
 448         phys = inode_getblk(inode, block, &err, &new);
 449         if (!phys)
 450                 goto abort;
 451
 452         if (new)
 453                 set_buffer_new(bh_result);
 454         map_bh(bh_result, inode->i_sb, phys);
 455
 456 abort:
 457         up_write(&iinfo->i_data_sem);
 458         return err;
 459 }
 460
 461 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 462                                       int create, int *err)
 463 {
 464         struct buffer_head *bh;
 465         struct buffer_head dummy;
 466
 467         dummy.b_state = 0;
 468         dummy.b_blocknr = -1000;
 469         *err = udf_get_block(inode, block, &dummy, create);
 470         if (!*err && buffer_mapped(&dummy)) {
 471                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 472                 if (buffer_new(&dummy)) {
 473                         lock_buffer(bh);
 474                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 475                         set_buffer_uptodate(bh);
 476                         unlock_buffer(bh);
 477                         mark_buffer_dirty_inode(bh, inode);
 478                 }
 479                 return bh;
 480         }
 481
 482         return NULL;
 483 }
 484
 485 /* Extend the file by 'blocks' blocks, return the number of extents added */
 486 static int udf_do_extend_file(struct inode *inode,
 487                               struct extent_position *last_pos,
 488                               struct kernel_long_ad *last_ext,
 489                               sector_t blocks)
 490 {
 491         sector_t add;
 492         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 493         struct super_block *sb = inode->i_sb;
 494         struct kernel_lb_addr prealloc_loc = {};
 495         int prealloc_len = 0;
 496         struct udf_inode_info *iinfo;
 497         int err;
 498
 499         /* The previous extent is fake and we should not extend by anything
 500          * - there's nothing to do... */
 501         if (!blocks && fake)
 502                 return 0;
 503
 504         iinfo = UDF_I(inode);
 505         /* Round the last extent up to a multiple of block size */
 506         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 507                 last_ext->extLength =
 508                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 509                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 510                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 511                 iinfo->i_lenExtents =
 512                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 513                         ~(sb->s_blocksize - 1);
 514         }
 515
 516         /* Last extent are just preallocated blocks? */
 517         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 518                                                 EXT_NOT_RECORDED_ALLOCATED) {
 519                 /* Save the extent so that we can reattach it to the end */
 520                 prealloc_loc = last_ext->extLocation;
 521                 prealloc_len = last_ext->extLength;
 522                 /* Mark the extent as a hole */
 523                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 524                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 525                 last_ext->extLocation.logicalBlockNum = 0;
 526                 last_ext->extLocation.partitionReferenceNum = 0;
 527         }
 528
 529         /* Can we merge with the previous extent? */
 530         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 531                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 532                 add = ((1 << 30) - sb->s_blocksize -
 533                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 534                         sb->s_blocksize_bits;
 535                 if (add > blocks)
 536                         add = blocks;
 537                 blocks -= add;
 538                 last_ext->extLength += add << sb->s_blocksize_bits;
 539         }
 540
 541         if (fake) {
 542                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 543                              last_ext->extLength, 1);
 544                 count++;
 545         } else
 546                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 547                                 last_ext->extLength, 1);
 548
 549         /* Managed to do everything necessary? */
 550         if (!blocks)
 551                 goto out;
 552
 553         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 554         last_ext->extLocation.logicalBlockNum = 0;
 555         last_ext->extLocation.partitionReferenceNum = 0;
 556         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 557         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 558                                 (add << sb->s_blocksize_bits);
 559
 560         /* Create enough extents to cover the whole hole */
 561         while (blocks > add) {
 562                 blocks -= add;
 563                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 564                                    last_ext->extLength, 1);
 565                 if (err)
 566                         return err;
 567                 count++;
 568         }
 569         if (blocks) {
 570                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 571                         (blocks << sb->s_blocksize_bits);
 572                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 573                                    last_ext->extLength, 1);
 574                 if (err)
 575                         return err;
 576                 count++;
 577         }
 578
 579 out:
 580         /* Do we have some preallocated blocks saved? */
 581         if (prealloc_len) {
 582                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 583                                    prealloc_len, 1);
 584                 if (err)
 585                         return err;
 586                 last_ext->extLocation = prealloc_loc;
 587                 last_ext->extLength = prealloc_len;
 588                 count++;
 589         }
 590
 591         /* last_pos should point to the last written extent... */
 592         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 593                 last_pos->offset -= sizeof(struct short_ad);
 594         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 595                 last_pos->offset -= sizeof(struct long_ad);
 596         else
 597                 return -EIO;
 598
 599         return count;
 600 }
 601
 602 static int udf_extend_file(struct inode *inode, loff_t newsize)
 603 {
 604
 605         struct extent_position epos;
 606         struct kernel_lb_addr eloc;
 607         uint32_t elen;
 608         int8_t etype;
 609         struct super_block *sb = inode->i_sb;
 610         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 611         int adsize;
 612         struct udf_inode_info *iinfo = UDF_I(inode);
 613         struct kernel_long_ad extent;
 614         int err;
 615
 616         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 617                 adsize = sizeof(struct short_ad);
 618         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 619                 adsize = sizeof(struct long_ad);
 620         else
 621                 BUG();
 622
 623         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 624
 625         /* File has extent covering the new size (could happen when extending
 626          * inside a block)? */
 627         if (etype != -1)
 628                 return 0;
 629         if (newsize & (sb->s_blocksize - 1))
 630                 offset++;
 631         /* Extended file just to the boundary of the last file block? */
 632         if (offset == 0)
 633                 return 0;
 634
 635         /* Truncate is extending the file by 'offset' blocks */
 636         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 637             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 638                 /* File has no extents at all or has empty last
 639                  * indirect extent! Create a fake extent... */
 640                 extent.extLocation.logicalBlockNum = 0;
 641                 extent.extLocation.partitionReferenceNum = 0;
 642                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 643         } else {
 644                 epos.offset -= adsize;
 645                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 646                                       &extent.extLength, 0);
 647                 extent.extLength |= etype << 30;
 648         }
 649         err = udf_do_extend_file(inode, &epos, &extent, offset);
 650         if (err < 0)
 651                 goto out;
 652         err = 0;
 653         iinfo->i_lenExtents = newsize;
 654 out:
 655         brelse(epos.bh);
 656         return err;
 657 }
 658
 659 static sector_t inode_getblk(struct inode *inode, sector_t block,
 660                              int *err, int *new)
 661 {
 662         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 663         struct extent_position prev_epos, cur_epos, next_epos;
 664         int count = 0, startnum = 0, endnum = 0;
 665         uint32_t elen = 0, tmpelen;
 666         struct kernel_lb_addr eloc, tmpeloc;
 667         int c = 1;
 668         loff_t lbcount = 0, b_off = 0;
 669         uint32_t newblocknum, newblock;
 670         sector_t offset = 0;
 671         int8_t etype;
 672         struct udf_inode_info *iinfo = UDF_I(inode);
 673         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 674         int lastblock = 0;
 675         bool isBeyondEOF;
 676
 677         *err = 0;
 678         *new = 0;
 679         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 680         prev_epos.block = iinfo->i_location;
 681         prev_epos.bh = NULL;
 682         cur_epos = next_epos = prev_epos;
 683         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 684
 685         /* find the extent which contains the block we are looking for.
 686            alternate between laarr[0] and laarr[1] for locations of the
 687            current extent, and the previous extent */
 688         do {
 689                 if (prev_epos.bh != cur_epos.bh) {
 690                         brelse(prev_epos.bh);
 691                         get_bh(cur_epos.bh);
 692                         prev_epos.bh = cur_epos.bh;
 693                 }
 694                 if (cur_epos.bh != next_epos.bh) {
 695                         brelse(cur_epos.bh);
 696                         get_bh(next_epos.bh);
 697                         cur_epos.bh = next_epos.bh;
 698                 }
 699
 700                 lbcount += elen;
 701
 702                 prev_epos.block = cur_epos.block;
 703                 cur_epos.block = next_epos.block;
 704
 705                 prev_epos.offset = cur_epos.offset;
 706                 cur_epos.offset = next_epos.offset;
 707
 708                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 709                 if (etype == -1)
 710                         break;
 711
 712                 c = !c;
 713
 714                 laarr[c].extLength = (etype << 30) | elen;
 715                 laarr[c].extLocation = eloc;
 716
 717                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 718                         pgoal = eloc.logicalBlockNum +
 719                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 720                                  inode->i_sb->s_blocksize_bits);
 721
 722                 count++;
 723         } while (lbcount + elen <= b_off);
 724
 725         b_off -= lbcount;
 726         offset = b_off >> inode->i_sb->s_blocksize_bits;
 727         /*
 728          * Move prev_epos and cur_epos into indirect extent if we are at
 729          * the pointer to it
 730          */
 731         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 732         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 733
 734         /* if the extent is allocated and recorded, return the block
 735            if the extent is not a multiple of the blocksize, round up */
 736
 737         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 738                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 739                         elen = EXT_RECORDED_ALLOCATED |
 740                                 ((elen + inode->i_sb->s_blocksize - 1) &
 741                                  ~(inode->i_sb->s_blocksize - 1));
 742                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 743                 }
 744                 brelse(prev_epos.bh);
 745                 brelse(cur_epos.bh);
 746                 brelse(next_epos.bh);
 747                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 748                 return newblock;
 749         }
 750
 751         /* Are we beyond EOF? */
 752         if (etype == -1) {
 753                 int ret;
 754                 isBeyondEOF = 1;
 755                 if (count) {
 756                         if (c)
 757                                 laarr[0] = laarr[1];
 758                         startnum = 1;
 759                 } else {
 760                         /* Create a fake extent when there's not one */
 761                         memset(&laarr[0].extLocation, 0x00,
 762                                 sizeof(struct kernel_lb_addr));
 763                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 764                         /* Will udf_do_extend_file() create real extent from
 765                            a fake one? */
 766                         startnum = (offset > 0);
 767                 }
 768                 /* Create extents for the hole between EOF and offset */
 769                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 770                 if (ret < 0) {
 771                         brelse(prev_epos.bh);
 772                         brelse(cur_epos.bh);
 773                         brelse(next_epos.bh);
 774                         *err = ret;
 775                         return 0;
 776                 }
 777                 c = 0;
 778                 offset = 0;
 779                 count += ret;
 780                 /* We are not covered by a preallocated extent? */
 781                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 782                                                 EXT_NOT_RECORDED_ALLOCATED) {
 783                         /* Is there any real extent? - otherwise we overwrite
 784                          * the fake one... */
 785                         if (count)
 786                                 c = !c;
 787                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 788                                 inode->i_sb->s_blocksize;
 789                         memset(&laarr[c].extLocation, 0x00,
 790                                 sizeof(struct kernel_lb_addr));
 791                         count++;
 792                 }
 793                 endnum = c + 1;
 794                 lastblock = 1;
 795         } else {
 796                 isBeyondEOF = 0;
 797                 endnum = startnum = ((count > 2) ? 2 : count);
 798
 799                 /* if the current extent is in position 0,
 800                    swap it with the previous */
 801                 if (!c && count != 1) {
 802                         laarr[2] = laarr[0];
 803                         laarr[0] = laarr[1];
 804                         laarr[1] = laarr[2];
 805                         c = 1;
 806                 }
 807
 808                 /* if the current block is located in an extent,
 809                    read the next extent */
 810                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 811                 if (etype != -1) {
 812                         laarr[c + 1].extLength = (etype << 30) | elen;
 813                         laarr[c + 1].extLocation = eloc;
 814                         count++;
 815                         startnum++;
 816                         endnum++;
 817                 } else
 818                         lastblock = 1;
 819         }
 820
 821         /* if the current extent is not recorded but allocated, get the
 822          * block in the extent corresponding to the requested block */
 823         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 824                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 825         else { /* otherwise, allocate a new block */
 826                 if (iinfo->i_next_alloc_block == block)
 827                         goal = iinfo->i_next_alloc_goal;
 828
 829                 if (!goal) {
 830                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 831                                 goal = iinfo->i_location.logicalBlockNum + 1;
 832                 }
 833
 834                 newblocknum = udf_new_block(inode->i_sb, inode,
 835                                 iinfo->i_location.partitionReferenceNum,
 836                                 goal, err);
 837                 if (!newblocknum) {
 838                         brelse(prev_epos.bh);
 839                         brelse(cur_epos.bh);
 840                         brelse(next_epos.bh);
 841                         *err = -ENOSPC;
 842                         return 0;
 843                 }
 844                 if (isBeyondEOF)
 845                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 846         }
 847
 848         /* if the extent the requsted block is located in contains multiple
 849          * blocks, split the extent into at most three extents. blocks prior
 850          * to requested block, requested block, and blocks after requested
 851          * block */
 852         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 853
 854 #ifdef UDF_PREALLOCATE
 855         /* We preallocate blocks only for regular files. It also makes sense
 856          * for directories but there's a problem when to drop the
 857          * preallocation. We might use some delayed work for that but I feel
 858          * it's overengineering for a filesystem like UDF. */
 859         if (S_ISREG(inode->i_mode))
 860                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 861 #endif
 862
 863         /* merge any continuous blocks in laarr */
 864         udf_merge_extents(inode, laarr, &endnum);
 865
 866         /* write back the new extents, inserting new extents if the new number
 867          * of extents is greater than the old number, and deleting extents if
 868          * the new number of extents is less than the old number */
 869         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 870
 871         brelse(prev_epos.bh);
 872         brelse(cur_epos.bh);
 873         brelse(next_epos.bh);
 874
 875         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 876                                 iinfo->i_location.partitionReferenceNum, 0);
 877         if (!newblock) {
 878                 *err = -EIO;
 879                 return 0;
 880         }
 881         *new = 1;
 882         iinfo->i_next_alloc_block = block;
 883         iinfo->i_next_alloc_goal = newblocknum;
 884         inode->i_ctime = current_fs_time(inode->i_sb);
 885
 886         if (IS_SYNC(inode))
 887                 udf_sync_inode(inode);
 888         else
 889                 mark_inode_dirty(inode);
 890
 891         return newblock;
 892 }
 893
 894 static void udf_split_extents(struct inode *inode, int *c, int offset,
 895                               int newblocknum,
 896                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 897                               int *endnum)
 898 {
 899         unsigned long blocksize = inode->i_sb->s_blocksize;
 900         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 901
 902         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 903             (laarr[*c].extLength >> 30) ==
 904                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 905                 int curr = *c;
 906                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 907                             blocksize - 1) >> blocksize_bits;
 908                 int8_t etype = (laarr[curr].extLength >> 30);
 909
 910                 if (blen == 1)
 911                         ;
 912                 else if (!offset || blen == offset + 1) {
 913                         laarr[curr + 2] = laarr[curr + 1];
 914                         laarr[curr + 1] = laarr[curr];
 915                 } else {
 916                         laarr[curr + 3] = laarr[curr + 1];
 917                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 918                 }
 919
 920                 if (offset) {
 921                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 922                                 udf_free_blocks(inode->i_sb, inode,
 923                                                 &laarr[curr].extLocation,
 924                                                 0, offset);
 925                                 laarr[curr].extLength =
 926                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 927                                         (offset << blocksize_bits);
 928                                 laarr[curr].extLocation.logicalBlockNum = 0;
 929                                 laarr[curr].extLocation.
 930                                                 partitionReferenceNum = 0;
 931                         } else
 932                                 laarr[curr].extLength = (etype << 30) |
 933                                         (offset << blocksize_bits);
 934                         curr++;
 935                         (*c)++;
 936                         (*endnum)++;
 937                 }
 938
 939                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 940                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 941                         laarr[curr].extLocation.partitionReferenceNum =
 942                                 UDF_I(inode)->i_location.partitionReferenceNum;
 943                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 944                         blocksize;
 945                 curr++;
 946
 947                 if (blen != offset + 1) {
 948                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 949                                 laarr[curr].extLocation.logicalBlockNum +=
 950                                                                 offset + 1;
 951                         laarr[curr].extLength = (etype << 30) |
 952                                 ((blen - (offset + 1)) << blocksize_bits);
 953                         curr++;
 954                         (*endnum)++;
 955                 }
 956         }
 957 }
 958
 959 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 960                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 961                                  int *endnum)
 962 {
 963         int start, length = 0, currlength = 0, i;
 964
 965         if (*endnum >= (c + 1)) {
 966                 if (!lastblock)
 967                         return;
 968                 else
 969                         start = c;
 970         } else {
 971                 if ((laarr[c + 1].extLength >> 30) ==
 972                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 973                         start = c + 1;
 974                         length = currlength =
 975                                 (((laarr[c + 1].extLength &
 976                                         UDF_EXTENT_LENGTH_MASK) +
 977                                 inode->i_sb->s_blocksize - 1) >>
 978                                 inode->i_sb->s_blocksize_bits);
 979                 } else
 980                         start = c;
 981         }
 982
 983         for (i = start + 1; i <= *endnum; i++) {
 984                 if (i == *endnum) {
 985                         if (lastblock)
 986                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 987                 } else if ((laarr[i].extLength >> 30) ==
 988                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 989                         length += (((laarr[i].extLength &
 990                                                 UDF_EXTENT_LENGTH_MASK) +
 991                                     inode->i_sb->s_blocksize - 1) >>
 992                                     inode->i_sb->s_blocksize_bits);
 993                 } else
 994                         break;
 995         }
 996
 997         if (length) {
 998                 int next = laarr[start].extLocation.logicalBlockNum +
 999                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1000                           inode->i_sb->s_blocksize - 1) >>
1001                           inode->i_sb->s_blocksize_bits);
1002                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1003                                 laarr[start].extLocation.partitionReferenceNum,
1004                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1005                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1006                                 currlength);
1007                 if (numalloc)   {
1008                         if (start == (c + 1))
1009                                 laarr[start].extLength +=
1010                                         (numalloc <<
1011                                          inode->i_sb->s_blocksize_bits);
1012                         else {
1013                                 memmove(&laarr[c + 2], &laarr[c + 1],
1014                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1015                                 (*endnum)++;
1016                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1017                                 laarr[c + 1].extLocation.partitionReferenceNum =
1018                                         laarr[c].extLocation.
1019                                                         partitionReferenceNum;
1020                                 laarr[c + 1].extLength =
1021                                         EXT_NOT_RECORDED_ALLOCATED |
1022                                         (numalloc <<
1023                                          inode->i_sb->s_blocksize_bits);
1024                                 start = c + 1;
1025                         }
1026
1027                         for (i = start + 1; numalloc && i < *endnum; i++) {
1028                                 int elen = ((laarr[i].extLength &
1029                                                 UDF_EXTENT_LENGTH_MASK) +
1030                                             inode->i_sb->s_blocksize - 1) >>
1031                                             inode->i_sb->s_blocksize_bits;
1032
1033                                 if (elen > numalloc) {
1034                                         laarr[i].extLength -=
1035                                                 (numalloc <<
1036                                                  inode->i_sb->s_blocksize_bits);
1037                                         numalloc = 0;
1038                                 } else {
1039                                         numalloc -= elen;
1040                                         if (*endnum > (i + 1))
1041                                                 memmove(&laarr[i],
1042                                                         &laarr[i + 1],
1043                                                         sizeof(struct long_ad) *
1044                                                         (*endnum - (i + 1)));
1045                                         i--;
1046                                         (*endnum)--;
1047                                 }
1048                         }
1049                         UDF_I(inode)->i_lenExtents +=
1050                                 numalloc << inode->i_sb->s_blocksize_bits;
1051                 }
1052         }
1053 }
1054
1055 static void udf_merge_extents(struct inode *inode,
1056                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1057                               int *endnum)
1058 {
1059         int i;
1060         unsigned long blocksize = inode->i_sb->s_blocksize;
1061         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1062
1063         for (i = 0; i < (*endnum - 1); i++) {
1064                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1065                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1066
1067                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1068                         (((li->extLength >> 30) ==
1069                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1070                         ((lip1->extLocation.logicalBlockNum -
1071                           li->extLocation.logicalBlockNum) ==
1072                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1073                         blocksize - 1) >> blocksize_bits)))) {
1074
1075                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1076                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1077                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1078                                 lip1->extLength = (lip1->extLength -
1079                                                   (li->extLength &
1080                                                    UDF_EXTENT_LENGTH_MASK) +
1081                                                    UDF_EXTENT_LENGTH_MASK) &
1082                                                         ~(blocksize - 1);
1083                                 li->extLength = (li->extLength &
1084                                                  UDF_EXTENT_FLAG_MASK) +
1085                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1086                                                 blocksize;
1087                                 lip1->extLocation.logicalBlockNum =
1088                                         li->extLocation.logicalBlockNum +
1089                                         ((li->extLength &
1090                                                 UDF_EXTENT_LENGTH_MASK) >>
1091                                                 blocksize_bits);
1092                         } else {
1093                                 li->extLength = lip1->extLength +
1094                                         (((li->extLength &
1095                                                 UDF_EXTENT_LENGTH_MASK) +
1096                                          blocksize - 1) & ~(blocksize - 1));
1097                                 if (*endnum > (i + 2))
1098                                         memmove(&laarr[i + 1], &laarr[i + 2],
1099                                                 sizeof(struct long_ad) *
1100                                                 (*endnum - (i + 2)));
1101                                 i--;
1102                                 (*endnum)--;
1103                         }
1104                 } else if (((li->extLength >> 30) ==
1105                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1106                            ((lip1->extLength >> 30) ==
1107                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1108                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1109                                         ((li->extLength &
1110                                           UDF_EXTENT_LENGTH_MASK) +
1111                                          blocksize - 1) >> blocksize_bits);
1112                         li->extLocation.logicalBlockNum = 0;
1113                         li->extLocation.partitionReferenceNum = 0;
1114
1115                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1116                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1117                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1118                                 lip1->extLength = (lip1->extLength -
1119                                                    (li->extLength &
1120                                                    UDF_EXTENT_LENGTH_MASK) +
1121                                                    UDF_EXTENT_LENGTH_MASK) &
1122                                                    ~(blocksize - 1);
1123                                 li->extLength = (li->extLength &
1124                                                  UDF_EXTENT_FLAG_MASK) +
1125                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1126                                                 blocksize;
1127                         } else {
1128                                 li->extLength = lip1->extLength +
1129                                         (((li->extLength &
1130                                                 UDF_EXTENT_LENGTH_MASK) +
1131                                           blocksize - 1) & ~(blocksize - 1));
1132                                 if (*endnum > (i + 2))
1133                                         memmove(&laarr[i + 1], &laarr[i + 2],
1134                                                 sizeof(struct long_ad) *
1135                                                 (*endnum - (i + 2)));
1136                                 i--;
1137                                 (*endnum)--;
1138                         }
1139                 } else if ((li->extLength >> 30) ==
1140                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1141                         udf_free_blocks(inode->i_sb, inode,
1142                                         &li->extLocation, 0,
1143                                         ((li->extLength &
1144                                                 UDF_EXTENT_LENGTH_MASK) +
1145                                          blocksize - 1) >> blocksize_bits);
1146                         li->extLocation.logicalBlockNum = 0;
1147                         li->extLocation.partitionReferenceNum = 0;
1148                         li->extLength = (li->extLength &
1149                                                 UDF_EXTENT_LENGTH_MASK) |
1150                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1151                 }
1152         }
1153 }
1154
1155 static void udf_update_extents(struct inode *inode,
1156                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1157                                int startnum, int endnum,
1158                                struct extent_position *epos)
1159 {
1160         int start = 0, i;
1161         struct kernel_lb_addr tmploc;
1162         uint32_t tmplen;
1163
1164         if (startnum > endnum) {
1165                 for (i = 0; i < (startnum - endnum); i++)
1166                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1167                                         laarr[i].extLength);
1168         } else if (startnum < endnum) {
1169                 for (i = 0; i < (endnum - startnum); i++) {
1170                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1171                                         laarr[i].extLength);
1172                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1173                                       &laarr[i].extLength, 1);
1174                         start++;
1175                 }
1176         }
1177
1178         for (i = start; i < endnum; i++) {
1179                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1180                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1181                                laarr[i].extLength, 1);
1182         }
1183 }
1184
1185 struct buffer_head *udf_bread(struct inode *inode, int block,
1186                               int create, int *err)
1187 {
1188         struct buffer_head *bh = NULL;
1189
1190         bh = udf_getblk(inode, block, create, err);
1191         if (!bh)
1192                 return NULL;
1193
1194         if (buffer_uptodate(bh))
1195                 return bh;
1196
1197         ll_rw_block(READ, 1, &bh);
1198
1199         wait_on_buffer(bh);
1200         if (buffer_uptodate(bh))
1201                 return bh;
1202
1203         brelse(bh);
1204         *err = -EIO;
1205         return NULL;
1206 }
1207
1208 int udf_setsize(struct inode *inode, loff_t newsize)
1209 {
1210         int err;
1211         struct udf_inode_info *iinfo;
1212         int bsize = 1 << inode->i_blkbits;
1213
1214         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1215               S_ISLNK(inode->i_mode)))
1216                 return -EINVAL;
1217         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1218                 return -EPERM;
1219
1220         iinfo = UDF_I(inode);
1221         if (newsize > inode->i_size) {
1222                 down_write(&iinfo->i_data_sem);
1223                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1224                         if (bsize <
1225                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1226                                 err = udf_expand_file_adinicb(inode);
1227                                 if (err)
1228                                         return err;
1229                                 down_write(&iinfo->i_data_sem);
1230                         } else {
1231                                 iinfo->i_lenAlloc = newsize;
1232                                 goto set_size;
1233                         }
1234                 }
1235                 err = udf_extend_file(inode, newsize);
1236                 if (err) {
1237                         up_write(&iinfo->i_data_sem);
1238                         return err;
1239                 }
1240 set_size:
1241                 truncate_setsize(inode, newsize);
1242                 up_write(&iinfo->i_data_sem);
1243         } else {
1244                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1245                         down_write(&iinfo->i_data_sem);
1246                         udf_clear_extent_cache(inode);
1247                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1248                                0x00, bsize - newsize -
1249                                udf_file_entry_alloc_offset(inode));
1250                         iinfo->i_lenAlloc = newsize;
1251                         truncate_setsize(inode, newsize);
1252                         up_write(&iinfo->i_data_sem);
1253                         goto update_time;
1254                 }
1255                 err = block_truncate_page(inode->i_mapping, newsize,
1256                                           udf_get_block);
1257                 if (err)
1258                         return err;
1259                 down_write(&iinfo->i_data_sem);
1260                 udf_clear_extent_cache(inode);
1261                 truncate_setsize(inode, newsize);
1262                 udf_truncate_extents(inode);
1263                 up_write(&iinfo->i_data_sem);
1264         }
1265 update_time:
1266         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1267         if (IS_SYNC(inode))
1268                 udf_sync_inode(inode);
1269         else
1270                 mark_inode_dirty(inode);
1271         return 0;
1272 }
1273
1274 static void __udf_read_inode(struct inode *inode)
1275 {
1276         struct buffer_head *bh = NULL;
1277         struct fileEntry *fe;
1278         uint16_t ident;
1279         struct udf_inode_info *iinfo = UDF_I(inode);
1280
1281         /*
1282          * Set defaults, but the inode is still incomplete!
1283          * Note: get_new_inode() sets the following on a new inode:
1284          *      i_sb = sb
1285          *      i_no = ino
1286          *      i_flags = sb->s_flags
1287          *      i_state = 0
1288          * clean_inode(): zero fills and sets
1289          *      i_count = 1
1290          *      i_nlink = 1
1291          *      i_op = NULL;
1292          */
1293         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1294         if (!bh) {
1295                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1296                 make_bad_inode(inode);
1297                 return;
1298         }
1299
1300         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1301             ident != TAG_IDENT_USE) {
1302                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1303                         inode->i_ino, ident);
1304                 brelse(bh);
1305                 make_bad_inode(inode);
1306                 return;
1307         }
1308
1309         fe = (struct fileEntry *)bh->b_data;
1310
1311         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1312                 struct buffer_head *ibh;
1313
1314                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1315                                         &ident);
1316                 if (ident == TAG_IDENT_IE && ibh) {
1317                         struct buffer_head *nbh = NULL;
1318                         struct kernel_lb_addr loc;
1319                         struct indirectEntry *ie;
1320
1321                         ie = (struct indirectEntry *)ibh->b_data;
1322                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1323
1324                         if (ie->indirectICB.extLength &&
1325                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1326                                                         &ident))) {
1327                                 if (ident == TAG_IDENT_FE ||
1328                                         ident == TAG_IDENT_EFE) {
1329                                         memcpy(&iinfo->i_location,
1330                                                 &loc,
1331                                                 sizeof(struct kernel_lb_addr));
1332                                         brelse(bh);
1333                                         brelse(ibh);
1334                                         brelse(nbh);
1335                                         __udf_read_inode(inode);
1336                                         return;
1337                                 }
1338                                 brelse(nbh);
1339                         }
1340                 }
1341                 brelse(ibh);
1342         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1343                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1344                         le16_to_cpu(fe->icbTag.strategyType));
1345                 brelse(bh);
1346                 make_bad_inode(inode);
1347                 return;
1348         }
1349         udf_fill_inode(inode, bh);
1350
1351         brelse(bh);
1352 }
1353
1354 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1355 {
1356         struct fileEntry *fe;
1357         struct extendedFileEntry *efe;
1358         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1359         struct udf_inode_info *iinfo = UDF_I(inode);
1360         unsigned int link_count;
1361
1362         fe = (struct fileEntry *)bh->b_data;
1363         efe = (struct extendedFileEntry *)bh->b_data;
1364
1365         if (fe->icbTag.strategyType == cpu_to_le16(4))
1366                 iinfo->i_strat4096 = 0;
1367         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1368                 iinfo->i_strat4096 = 1;
1369
1370         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1371                                                         ICBTAG_FLAG_AD_MASK;
1372         iinfo->i_unique = 0;
1373         iinfo->i_lenEAttr = 0;
1374         iinfo->i_lenExtents = 0;
1375         iinfo->i_lenAlloc = 0;
1376         iinfo->i_next_alloc_block = 0;
1377         iinfo->i_next_alloc_goal = 0;
1378         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1379                 iinfo->i_efe = 1;
1380                 iinfo->i_use = 0;
1381                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1382                                         sizeof(struct extendedFileEntry))) {
1383                         make_bad_inode(inode);
1384                         return;
1385                 }
1386                 memcpy(iinfo->i_ext.i_data,
1387                        bh->b_data + sizeof(struct extendedFileEntry),
1388                        inode->i_sb->s_blocksize -
1389                                         sizeof(struct extendedFileEntry));
1390         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1391                 iinfo->i_efe = 0;
1392                 iinfo->i_use = 0;
1393                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1394                                                 sizeof(struct fileEntry))) {
1395                         make_bad_inode(inode);
1396                         return;
1397                 }
1398                 memcpy(iinfo->i_ext.i_data,
1399                        bh->b_data + sizeof(struct fileEntry),
1400                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1401         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1402                 iinfo->i_efe = 0;
1403                 iinfo->i_use = 1;
1404                 iinfo->i_lenAlloc = le32_to_cpu(
1405                                 ((struct unallocSpaceEntry *)bh->b_data)->
1406                                  lengthAllocDescs);
1407                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1408                                         sizeof(struct unallocSpaceEntry))) {
1409                         make_bad_inode(inode);
1410                         return;
1411                 }
1412                 memcpy(iinfo->i_ext.i_data,
1413                        bh->b_data + sizeof(struct unallocSpaceEntry),
1414                        inode->i_sb->s_blocksize -
1415                                         sizeof(struct unallocSpaceEntry));
1416                 return;
1417         }
1418
1419         read_lock(&sbi->s_cred_lock);
1420         i_uid_write(inode, le32_to_cpu(fe->uid));
1421         if (!uid_valid(inode->i_uid) ||
1422             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1423             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1424                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1425
1426         i_gid_write(inode, le32_to_cpu(fe->gid));
1427         if (!gid_valid(inode->i_gid) ||
1428             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1429             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1430                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1431
1432         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1433                         sbi->s_fmode != UDF_INVALID_MODE)
1434                 inode->i_mode = sbi->s_fmode;
1435         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1436                         sbi->s_dmode != UDF_INVALID_MODE)
1437                 inode->i_mode = sbi->s_dmode;
1438         else
1439                 inode->i_mode = udf_convert_permissions(fe);
1440         inode->i_mode &= ~sbi->s_umask;
1441         read_unlock(&sbi->s_cred_lock);
1442
1443         link_count = le16_to_cpu(fe->fileLinkCount);
1444         if (!link_count)
1445                 link_count = 1;
1446         set_nlink(inode, link_count);
1447
1448         inode->i_size = le64_to_cpu(fe->informationLength);
1449         iinfo->i_lenExtents = inode->i_size;
1450
1451         if (iinfo->i_efe == 0) {
1452                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1453                         (inode->i_sb->s_blocksize_bits - 9);
1454
1455                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1456                         inode->i_atime = sbi->s_record_time;
1457
1458                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1459                                             fe->modificationTime))
1460                         inode->i_mtime = sbi->s_record_time;
1461
1462                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1463                         inode->i_ctime = sbi->s_record_time;
1464
1465                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1466                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1467                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1468                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1469         } else {
1470                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1471                     (inode->i_sb->s_blocksize_bits - 9);
1472
1473                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1474                         inode->i_atime = sbi->s_record_time;
1475
1476                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1477                                             efe->modificationTime))
1478                         inode->i_mtime = sbi->s_record_time;
1479
1480                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1481                         iinfo->i_crtime = sbi->s_record_time;
1482
1483                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1484                         inode->i_ctime = sbi->s_record_time;
1485
1486                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1487                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1488                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1489                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1490         }
1491
1492         switch (fe->icbTag.fileType) {
1493         case ICBTAG_FILE_TYPE_DIRECTORY:
1494                 inode->i_op = &udf_dir_inode_operations;
1495                 inode->i_fop = &udf_dir_operations;
1496                 inode->i_mode |= S_IFDIR;
1497                 inc_nlink(inode);
1498                 break;
1499         case ICBTAG_FILE_TYPE_REALTIME:
1500         case ICBTAG_FILE_TYPE_REGULAR:
1501         case ICBTAG_FILE_TYPE_UNDEF:
1502         case ICBTAG_FILE_TYPE_VAT20:
1503                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1504                         inode->i_data.a_ops = &udf_adinicb_aops;
1505                 else
1506                         inode->i_data.a_ops = &udf_aops;
1507                 inode->i_op = &udf_file_inode_operations;
1508                 inode->i_fop = &udf_file_operations;
1509                 inode->i_mode |= S_IFREG;
1510                 break;
1511         case ICBTAG_FILE_TYPE_BLOCK:
1512                 inode->i_mode |= S_IFBLK;
1513                 break;
1514         case ICBTAG_FILE_TYPE_CHAR:
1515                 inode->i_mode |= S_IFCHR;
1516                 break;
1517         case ICBTAG_FILE_TYPE_FIFO:
1518                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1519                 break;
1520         case ICBTAG_FILE_TYPE_SOCKET:
1521                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1522                 break;
1523         case ICBTAG_FILE_TYPE_SYMLINK:
1524                 inode->i_data.a_ops = &udf_symlink_aops;
1525                 inode->i_op = &udf_symlink_inode_operations;
1526                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1527                 break;
1528         case ICBTAG_FILE_TYPE_MAIN:
1529                 udf_debug("METADATA FILE-----\n");
1530                 break;
1531         case ICBTAG_FILE_TYPE_MIRROR:
1532                 udf_debug("METADATA MIRROR FILE-----\n");
1533                 break;
1534         case ICBTAG_FILE_TYPE_BITMAP:
1535                 udf_debug("METADATA BITMAP FILE-----\n");
1536                 break;
1537         default:
1538                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1539                         inode->i_ino, fe->icbTag.fileType);
1540                 make_bad_inode(inode);
1541                 return;
1542         }
1543         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1544                 struct deviceSpec *dsea =
1545                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1546                 if (dsea) {
1547                         init_special_inode(inode, inode->i_mode,
1548                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1549                                       le32_to_cpu(dsea->minorDeviceIdent)));
1550                         /* Developer ID ??? */
1551                 } else
1552                         make_bad_inode(inode);
1553         }
1554 }
1555
1556 static int udf_alloc_i_data(struct inode *inode, size_t size)
1557 {
1558         struct udf_inode_info *iinfo = UDF_I(inode);
1559         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1560
1561         if (!iinfo->i_ext.i_data) {
1562                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1563                         inode->i_ino);
1564                 return -ENOMEM;
1565         }
1566
1567         return 0;
1568 }
1569
1570 static umode_t udf_convert_permissions(struct fileEntry *fe)
1571 {
1572         umode_t mode;
1573         uint32_t permissions;
1574         uint32_t flags;
1575
1576         permissions = le32_to_cpu(fe->permissions);
1577         flags = le16_to_cpu(fe->icbTag.flags);
1578
1579         mode =  ((permissions) & S_IRWXO) |
1580                 ((permissions >> 2) & S_IRWXG) |
1581                 ((permissions >> 4) & S_IRWXU) |
1582                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1583                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1584                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1585
1586         return mode;
1587 }
1588
1589 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1590 {
1591         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1592 }
1593
1594 static int udf_sync_inode(struct inode *inode)
1595 {
1596         return udf_update_inode(inode, 1);
1597 }
1598
1599 static int udf_update_inode(struct inode *inode, int do_sync)
1600 {
1601         struct buffer_head *bh = NULL;
1602         struct fileEntry *fe;
1603         struct extendedFileEntry *efe;
1604         uint64_t lb_recorded;
1605         uint32_t udfperms;
1606         uint16_t icbflags;
1607         uint16_t crclen;
1608         int err = 0;
1609         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1610         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1611         struct udf_inode_info *iinfo = UDF_I(inode);
1612
1613         bh = udf_tgetblk(inode->i_sb,
1614                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1615         if (!bh) {
1616                 udf_debug("getblk failure\n");
1617                 return -ENOMEM;
1618         }
1619
1620         lock_buffer(bh);
1621         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1622         fe = (struct fileEntry *)bh->b_data;
1623         efe = (struct extendedFileEntry *)bh->b_data;
1624
1625         if (iinfo->i_use) {
1626                 struct unallocSpaceEntry *use =
1627                         (struct unallocSpaceEntry *)bh->b_data;
1628
1629                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1630                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1631                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1632                                         sizeof(struct unallocSpaceEntry));
1633                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1634                 use->descTag.tagLocation =
1635                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1636                 crclen = sizeof(struct unallocSpaceEntry) +
1637                                 iinfo->i_lenAlloc - sizeof(struct tag);
1638                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1639                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1640                                                            sizeof(struct tag),
1641                                                            crclen));
1642                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1643
1644                 goto out;
1645         }
1646
1647         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1648                 fe->uid = cpu_to_le32(-1);
1649         else
1650                 fe->uid = cpu_to_le32(i_uid_read(inode));
1651
1652         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1653                 fe->gid = cpu_to_le32(-1);
1654         else
1655                 fe->gid = cpu_to_le32(i_gid_read(inode));
1656
1657         udfperms = ((inode->i_mode & S_IRWXO)) |
1658                    ((inode->i_mode & S_IRWXG) << 2) |
1659                    ((inode->i_mode & S_IRWXU) << 4);
1660
1661         udfperms |= (le32_to_cpu(fe->permissions) &
1662                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1663                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1664                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1665         fe->permissions = cpu_to_le32(udfperms);
1666
1667         if (S_ISDIR(inode->i_mode))
1668                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1669         else
1670                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1671
1672         fe->informationLength = cpu_to_le64(inode->i_size);
1673
1674         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1675                 struct regid *eid;
1676                 struct deviceSpec *dsea =
1677                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1678                 if (!dsea) {
1679                         dsea = (struct deviceSpec *)
1680                                 udf_add_extendedattr(inode,
1681                                                      sizeof(struct deviceSpec) +
1682                                                      sizeof(struct regid), 12, 0x3);
1683                         dsea->attrType = cpu_to_le32(12);
1684                         dsea->attrSubtype = 1;
1685                         dsea->attrLength = cpu_to_le32(
1686                                                 sizeof(struct deviceSpec) +
1687                                                 sizeof(struct regid));
1688                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1689                 }
1690                 eid = (struct regid *)dsea->impUse;
1691                 memset(eid, 0, sizeof(struct regid));
1692                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1693                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1694                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1695                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1696                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1697         }
1698
1699         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1700                 lb_recorded = 0; /* No extents => no blocks! */
1701         else
1702                 lb_recorded =
1703                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1704                         (blocksize_bits - 9);
1705
1706         if (iinfo->i_efe == 0) {
1707                 memcpy(bh->b_data + sizeof(struct fileEntry),
1708                        iinfo->i_ext.i_data,
1709                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1710                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1711
1712                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1713                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1714                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1715                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1716                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1717                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1718                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1719                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1720                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1721                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1722                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1723                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1724                 crclen = sizeof(struct fileEntry);
1725         } else {
1726                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1727                        iinfo->i_ext.i_data,
1728                        inode->i_sb->s_blocksize -
1729                                         sizeof(struct extendedFileEntry));
1730                 efe->objectSize = cpu_to_le64(inode->i_size);
1731                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1732
1733                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1734                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1735                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1736                         iinfo->i_crtime = inode->i_atime;
1737
1738                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1739                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1740                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1741                         iinfo->i_crtime = inode->i_mtime;
1742
1743                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1744                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1745                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1746                         iinfo->i_crtime = inode->i_ctime;
1747
1748                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1749                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1750                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1751                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1752
1753                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1754                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1755                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1756                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1757                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1758                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1759                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1760                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1761                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1762                 crclen = sizeof(struct extendedFileEntry);
1763         }
1764         if (iinfo->i_strat4096) {
1765                 fe->icbTag.strategyType = cpu_to_le16(4096);
1766                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1767                 fe->icbTag.numEntries = cpu_to_le16(2);
1768         } else {
1769                 fe->icbTag.strategyType = cpu_to_le16(4);
1770                 fe->icbTag.numEntries = cpu_to_le16(1);
1771         }
1772
1773         if (S_ISDIR(inode->i_mode))
1774                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1775         else if (S_ISREG(inode->i_mode))
1776                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1777         else if (S_ISLNK(inode->i_mode))
1778                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1779         else if (S_ISBLK(inode->i_mode))
1780                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1781         else if (S_ISCHR(inode->i_mode))
1782                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1783         else if (S_ISFIFO(inode->i_mode))
1784                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1785         else if (S_ISSOCK(inode->i_mode))
1786                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1787
1788         icbflags =      iinfo->i_alloc_type |
1789                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1790                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1791                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1792                         (le16_to_cpu(fe->icbTag.flags) &
1793                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1794                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1795
1796         fe->icbTag.flags = cpu_to_le16(icbflags);
1797         if (sbi->s_udfrev >= 0x0200)
1798                 fe->descTag.descVersion = cpu_to_le16(3);
1799         else
1800                 fe->descTag.descVersion = cpu_to_le16(2);
1801         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1802         fe->descTag.tagLocation = cpu_to_le32(
1803                                         iinfo->i_location.logicalBlockNum);
1804         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1805         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1806         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1807                                                   crclen));
1808         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1809
1810 out:
1811         set_buffer_uptodate(bh);
1812         unlock_buffer(bh);
1813
1814         /* write the data blocks */
1815         mark_buffer_dirty(bh);
1816         if (do_sync) {
1817                 sync_dirty_buffer(bh);
1818                 if (buffer_write_io_error(bh)) {
1819                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1820                                  inode->i_ino);
1821                         err = -EIO;
1822                 }
1823         }
1824         brelse(bh);
1825
1826         return err;
1827 }
1828
1829 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1830 {
1831         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1832         struct inode *inode = iget_locked(sb, block);
1833
1834         if (!inode)
1835                 return NULL;
1836
1837         if (inode->i_state & I_NEW) {
1838                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1839                 __udf_read_inode(inode);
1840                 unlock_new_inode(inode);
1841         }
1842
1843         if (is_bad_inode(inode))
1844                 goto out_iput;
1845
1846         if (ino->logicalBlockNum >= UDF_SB(sb)->
1847                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1848                 udf_debug("block=%d, partition=%d out of range\n",
1849                           ino->logicalBlockNum, ino->partitionReferenceNum);
1850                 make_bad_inode(inode);
1851                 goto out_iput;
1852         }
1853
1854         return inode;
1855
1856  out_iput:
1857         iput(inode);
1858         return NULL;
1859 }
1860
1861 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1862                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1863 {
1864         int adsize;
1865         struct short_ad *sad = NULL;
1866         struct long_ad *lad = NULL;
1867         struct allocExtDesc *aed;
1868         uint8_t *ptr;
1869         struct udf_inode_info *iinfo = UDF_I(inode);
1870
1871         if (!epos->bh)
1872                 ptr = iinfo->i_ext.i_data + epos->offset -
1873                         udf_file_entry_alloc_offset(inode) +
1874                         iinfo->i_lenEAttr;
1875         else
1876                 ptr = epos->bh->b_data + epos->offset;
1877
1878         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1879                 adsize = sizeof(struct short_ad);
1880         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1881                 adsize = sizeof(struct long_ad);
1882         else
1883                 return -EIO;
1884
1885         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1886                 unsigned char *sptr, *dptr;
1887                 struct buffer_head *nbh;
1888                 int err, loffset;
1889                 struct kernel_lb_addr obloc = epos->block;
1890
1891                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1892                                                 obloc.partitionReferenceNum,
1893                                                 obloc.logicalBlockNum, &err);
1894                 if (!epos->block.logicalBlockNum)
1895                         return -ENOSPC;
1896                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1897                                                                  &epos->block,
1898                                                                  0));
1899                 if (!nbh)
1900                         return -EIO;
1901                 lock_buffer(nbh);
1902                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1903                 set_buffer_uptodate(nbh);
1904                 unlock_buffer(nbh);
1905                 mark_buffer_dirty_inode(nbh, inode);
1906
1907                 aed = (struct allocExtDesc *)(nbh->b_data);
1908                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1909                         aed->previousAllocExtLocation =
1910                                         cpu_to_le32(obloc.logicalBlockNum);
1911                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1912                         loffset = epos->offset;
1913                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1914                         sptr = ptr - adsize;
1915                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1916                         memcpy(dptr, sptr, adsize);
1917                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1918                 } else {
1919                         loffset = epos->offset + adsize;
1920                         aed->lengthAllocDescs = cpu_to_le32(0);
1921                         sptr = ptr;
1922                         epos->offset = sizeof(struct allocExtDesc);
1923
1924                         if (epos->bh) {
1925                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1926                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1927                         } else {
1928                                 iinfo->i_lenAlloc += adsize;
1929                                 mark_inode_dirty(inode);
1930                         }
1931                 }
1932                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1933                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1934                                     epos->block.logicalBlockNum, sizeof(struct tag));
1935                 else
1936                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1937                                     epos->block.logicalBlockNum, sizeof(struct tag));
1938                 switch (iinfo->i_alloc_type) {
1939                 case ICBTAG_FLAG_AD_SHORT:
1940                         sad = (struct short_ad *)sptr;
1941                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1942                                                      inode->i_sb->s_blocksize);
1943                         sad->extPosition =
1944                                 cpu_to_le32(epos->block.logicalBlockNum);
1945                         break;
1946                 case ICBTAG_FLAG_AD_LONG:
1947                         lad = (struct long_ad *)sptr;
1948                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1949                                                      inode->i_sb->s_blocksize);
1950                         lad->extLocation = cpu_to_lelb(epos->block);
1951                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1952                         break;
1953                 }
1954                 if (epos->bh) {
1955                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1956                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1957                                 udf_update_tag(epos->bh->b_data, loffset);
1958                         else
1959                                 udf_update_tag(epos->bh->b_data,
1960                                                 sizeof(struct allocExtDesc));
1961                         mark_buffer_dirty_inode(epos->bh, inode);
1962                         brelse(epos->bh);
1963                 } else {
1964                         mark_inode_dirty(inode);
1965                 }
1966                 epos->bh = nbh;
1967         }
1968
1969         udf_write_aext(inode, epos, eloc, elen, inc);
1970
1971         if (!epos->bh) {
1972                 iinfo->i_lenAlloc += adsize;
1973                 mark_inode_dirty(inode);
1974         } else {
1975                 aed = (struct allocExtDesc *)epos->bh->b_data;
1976                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1977                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1978                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1979                         udf_update_tag(epos->bh->b_data,
1980                                         epos->offset + (inc ? 0 : adsize));
1981                 else
1982                         udf_update_tag(epos->bh->b_data,
1983                                         sizeof(struct allocExtDesc));
1984                 mark_buffer_dirty_inode(epos->bh, inode);
1985         }
1986
1987         return 0;
1988 }
1989
1990 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1991                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1992 {
1993         int adsize;
1994         uint8_t *ptr;
1995         struct short_ad *sad;
1996         struct long_ad *lad;
1997         struct udf_inode_info *iinfo = UDF_I(inode);
1998
1999         if (!epos->bh)
2000                 ptr = iinfo->i_ext.i_data + epos->offset -
2001                         udf_file_entry_alloc_offset(inode) +
2002                         iinfo->i_lenEAttr;
2003         else
2004                 ptr = epos->bh->b_data + epos->offset;
2005
2006         switch (iinfo->i_alloc_type) {
2007         case ICBTAG_FLAG_AD_SHORT:
2008                 sad = (struct short_ad *)ptr;
2009                 sad->extLength = cpu_to_le32(elen);
2010                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2011                 adsize = sizeof(struct short_ad);
2012                 break;
2013         case ICBTAG_FLAG_AD_LONG:
2014                 lad = (struct long_ad *)ptr;
2015                 lad->extLength = cpu_to_le32(elen);
2016                 lad->extLocation = cpu_to_lelb(*eloc);
2017                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2018                 adsize = sizeof(struct long_ad);
2019                 break;
2020         default:
2021                 return;
2022         }
2023
2024         if (epos->bh) {
2025                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2026                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2027                         struct allocExtDesc *aed =
2028                                 (struct allocExtDesc *)epos->bh->b_data;
2029                         udf_update_tag(epos->bh->b_data,
2030                                        le32_to_cpu(aed->lengthAllocDescs) +
2031                                        sizeof(struct allocExtDesc));
2032                 }
2033                 mark_buffer_dirty_inode(epos->bh, inode);
2034         } else {
2035                 mark_inode_dirty(inode);
2036         }
2037
2038         if (inc)
2039                 epos->offset += adsize;
2040 }
2041
2042 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2043                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2044 {
2045         int8_t etype;
2046
2047         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2048                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2049                 int block;
2050                 epos->block = *eloc;
2051                 epos->offset = sizeof(struct allocExtDesc);
2052                 brelse(epos->bh);
2053                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2054                 epos->bh = udf_tread(inode->i_sb, block);
2055                 if (!epos->bh) {
2056                         udf_debug("reading block %d failed!\n", block);
2057                         return -1;
2058                 }
2059         }
2060
2061         return etype;
2062 }
2063
2064 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2065                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2066 {
2067         int alen;
2068         int8_t etype;
2069         uint8_t *ptr;
2070         struct short_ad *sad;
2071         struct long_ad *lad;
2072         struct udf_inode_info *iinfo = UDF_I(inode);
2073
2074         if (!epos->bh) {
2075                 if (!epos->offset)
2076                         epos->offset = udf_file_entry_alloc_offset(inode);
2077                 ptr = iinfo->i_ext.i_data + epos->offset -
2078                         udf_file_entry_alloc_offset(inode) +
2079                         iinfo->i_lenEAttr;
2080                 alen = udf_file_entry_alloc_offset(inode) +
2081                                                         iinfo->i_lenAlloc;
2082         } else {
2083                 if (!epos->offset)
2084                         epos->offset = sizeof(struct allocExtDesc);
2085                 ptr = epos->bh->b_data + epos->offset;
2086                 alen = sizeof(struct allocExtDesc) +
2087                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2088                                                         lengthAllocDescs);
2089         }
2090
2091         switch (iinfo->i_alloc_type) {
2092         case ICBTAG_FLAG_AD_SHORT:
2093                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2094                 if (!sad)
2095                         return -1;
2096                 etype = le32_to_cpu(sad->extLength) >> 30;
2097                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2098                 eloc->partitionReferenceNum =
2099                                 iinfo->i_location.partitionReferenceNum;
2100                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2101                 break;
2102         case ICBTAG_FLAG_AD_LONG:
2103                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2104                 if (!lad)
2105                         return -1;
2106                 etype = le32_to_cpu(lad->extLength) >> 30;
2107                 *eloc = lelb_to_cpu(lad->extLocation);
2108                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2109                 break;
2110         default:
2111                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2112                 return -1;
2113         }
2114
2115         return etype;
2116 }
2117
2118 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2119                               struct kernel_lb_addr neloc, uint32_t nelen)
2120 {
2121         struct kernel_lb_addr oeloc;
2122         uint32_t oelen;
2123         int8_t etype;
2124
2125         if (epos.bh)
2126                 get_bh(epos.bh);
2127
2128         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2129                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2130                 neloc = oeloc;
2131                 nelen = (etype << 30) | oelen;
2132         }
2133         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2134         brelse(epos.bh);
2135
2136         return (nelen >> 30);
2137 }
2138
2139 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2140                        struct kernel_lb_addr eloc, uint32_t elen)
2141 {
2142         struct extent_position oepos;
2143         int adsize;
2144         int8_t etype;
2145         struct allocExtDesc *aed;
2146         struct udf_inode_info *iinfo;
2147
2148         if (epos.bh) {
2149                 get_bh(epos.bh);
2150                 get_bh(epos.bh);
2151         }
2152
2153         iinfo = UDF_I(inode);
2154         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2155                 adsize = sizeof(struct short_ad);
2156         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2157                 adsize = sizeof(struct long_ad);
2158         else
2159                 adsize = 0;
2160
2161         oepos = epos;
2162         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2163                 return -1;
2164
2165         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2166                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2167                 if (oepos.bh != epos.bh) {
2168                         oepos.block = epos.block;
2169                         brelse(oepos.bh);
2170                         get_bh(epos.bh);
2171                         oepos.bh = epos.bh;
2172                         oepos.offset = epos.offset - adsize;
2173                 }
2174         }
2175         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2176         elen = 0;
2177
2178         if (epos.bh != oepos.bh) {
2179                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2180                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2181                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2182                 if (!oepos.bh) {
2183                         iinfo->i_lenAlloc -= (adsize * 2);
2184                         mark_inode_dirty(inode);
2185                 } else {
2186                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2187                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2188                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2189                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2190                                 udf_update_tag(oepos.bh->b_data,
2191                                                 oepos.offset - (2 * adsize));
2192                         else
2193                                 udf_update_tag(oepos.bh->b_data,
2194                                                 sizeof(struct allocExtDesc));
2195                         mark_buffer_dirty_inode(oepos.bh, inode);
2196                 }
2197         } else {
2198                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2199                 if (!oepos.bh) {
2200                         iinfo->i_lenAlloc -= adsize;
2201                         mark_inode_dirty(inode);
2202                 } else {
2203                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2204                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2205                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2206                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2207                                 udf_update_tag(oepos.bh->b_data,
2208                                                 epos.offset - adsize);
2209                         else
2210                                 udf_update_tag(oepos.bh->b_data,
2211                                                 sizeof(struct allocExtDesc));
2212                         mark_buffer_dirty_inode(oepos.bh, inode);
2213                 }
2214         }
2215
2216         brelse(epos.bh);
2217         brelse(oepos.bh);
2218
2219         return (elen >> 30);
2220 }
2221
2222 int8_t inode_bmap(struct inode *inode, sector_t block,
2223                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2224                   uint32_t *elen, sector_t *offset)
2225 {
2226         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2227         loff_t lbcount = 0, bcount =
2228             (loff_t) block << blocksize_bits;
2229         int8_t etype;
2230         struct udf_inode_info *iinfo;
2231
2232         iinfo = UDF_I(inode);
2233         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2234                 pos->offset = 0;
2235                 pos->block = iinfo->i_location;
2236                 pos->bh = NULL;
2237         }
2238         *elen = 0;
2239         do {
2240                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2241                 if (etype == -1) {
2242                         *offset = (bcount - lbcount) >> blocksize_bits;
2243                         iinfo->i_lenExtents = lbcount;
2244                         return -1;
2245                 }
2246                 lbcount += *elen;
2247         } while (lbcount <= bcount);
2248         /* update extent cache */
2249         udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2250         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2251
2252         return etype;
2253 }
2254
2255 long udf_block_map(struct inode *inode, sector_t block)
2256 {
2257         struct kernel_lb_addr eloc;
2258         uint32_t elen;
2259         sector_t offset;
2260         struct extent_position epos = {};
2261         int ret;
2262
2263         down_read(&UDF_I(inode)->i_data_sem);
2264
2265         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2266                                                 (EXT_RECORDED_ALLOCATED >> 30))
2267                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2268         else
2269                 ret = 0;
2270
2271         up_read(&UDF_I(inode)->i_data_sem);
2272         brelse(epos.bh);
2273
2274         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2275                 return udf_fixed_to_variable(ret);
2276         else
2277                 return ret;
2278 }