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/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 #define EXTENT_MERGE_SIZE 5
  47
  48 static umode_t udf_convert_permissions(struct fileEntry *);
  49 static int udf_update_inode(struct inode *, int);
  50 static int udf_sync_inode(struct inode *inode);
  51 static int udf_alloc_i_data(struct inode *inode, size_t size);
  52 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  53 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  54                               struct kernel_lb_addr, uint32_t);
  55 static void udf_split_extents(struct inode *, int *, int, int,
  56                               struct kernel_long_ad *, int *);
  57 static void udf_prealloc_extents(struct inode *, int, int,
  58                                  struct kernel_long_ad *, int *);
  59 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  60 static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  61                                int, struct extent_position *);
  62 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  63
  64 static void __udf_clear_extent_cache(struct inode *inode)
  65 {
  66         struct udf_inode_info *iinfo = UDF_I(inode);
  67
  68         if (iinfo->cached_extent.lstart != -1) {
  69                 brelse(iinfo->cached_extent.epos.bh);
  70                 iinfo->cached_extent.lstart = -1;
  71         }
  72 }
  73
  74 /* Invalidate extent cache */
  75 static void udf_clear_extent_cache(struct inode *inode)
  76 {
  77         struct udf_inode_info *iinfo = UDF_I(inode);
  78
  79         spin_lock(&iinfo->i_extent_cache_lock);
  80         __udf_clear_extent_cache(inode);
  81         spin_unlock(&iinfo->i_extent_cache_lock);
  82 }
  83
  84 /* Return contents of extent cache */
  85 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  86                                  loff_t *lbcount, struct extent_position *pos)
  87 {
  88         struct udf_inode_info *iinfo = UDF_I(inode);
  89         int ret = 0;
  90
  91         spin_lock(&iinfo->i_extent_cache_lock);
  92         if ((iinfo->cached_extent.lstart <= bcount) &&
  93             (iinfo->cached_extent.lstart != -1)) {
  94                 /* Cache hit */
  95                 *lbcount = iinfo->cached_extent.lstart;
  96                 memcpy(pos, &iinfo->cached_extent.epos,
  97                        sizeof(struct extent_position));
  98                 if (pos->bh)
  99                         get_bh(pos->bh);
 100                 ret = 1;
 101         }
 102         spin_unlock(&iinfo->i_extent_cache_lock);
 103         return ret;
 104 }
 105
 106 /* Add extent to extent cache */
 107 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 108                                     struct extent_position *pos)
 109 {
 110         struct udf_inode_info *iinfo = UDF_I(inode);
 111
 112         spin_lock(&iinfo->i_extent_cache_lock);
 113         /* Invalidate previously cached extent */
 114         __udf_clear_extent_cache(inode);
 115         if (pos->bh)
 116                 get_bh(pos->bh);
 117         memcpy(&iinfo->cached_extent.epos, pos, sizeof(struct extent_position));
 118         iinfo->cached_extent.lstart = estart;
 119         switch (iinfo->i_alloc_type) {
 120         case ICBTAG_FLAG_AD_SHORT:
 121                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 122                 break;
 123         case ICBTAG_FLAG_AD_LONG:
 124                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 125                 break;
 126         }
 127         spin_unlock(&iinfo->i_extent_cache_lock);
 128 }
 129
 130 void udf_evict_inode(struct inode *inode)
 131 {
 132         struct udf_inode_info *iinfo = UDF_I(inode);
 133         int want_delete = 0;
 134
 135         if (!inode->i_nlink && !is_bad_inode(inode)) {
 136                 want_delete = 1;
 137                 udf_setsize(inode, 0);
 138                 udf_update_inode(inode, IS_SYNC(inode));
 139         }
 140         truncate_inode_pages_final(&inode->i_data);
 141         invalidate_inode_buffers(inode);
 142         clear_inode(inode);
 143         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 144             inode->i_size != iinfo->i_lenExtents) {
 145                 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",
 146                          inode->i_ino, inode->i_mode,
 147                          (unsigned long long)inode->i_size,
 148                          (unsigned long long)iinfo->i_lenExtents);
 149         }
 150         kfree(iinfo->i_ext.i_data);
 151         iinfo->i_ext.i_data = NULL;
 152         udf_clear_extent_cache(inode);
 153         if (want_delete) {
 154                 udf_free_inode(inode);
 155         }
 156 }
 157
 158 static void udf_write_failed(struct address_space *mapping, loff_t to)
 159 {
 160         struct inode *inode = mapping->host;
 161         struct udf_inode_info *iinfo = UDF_I(inode);
 162         loff_t isize = inode->i_size;
 163
 164         if (to > isize) {
 165                 truncate_pagecache(inode, isize);
 166                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 167                         down_write(&iinfo->i_data_sem);
 168                         udf_clear_extent_cache(inode);
 169                         udf_truncate_extents(inode);
 170                         up_write(&iinfo->i_data_sem);
 171                 }
 172         }
 173 }
 174
 175 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 176 {
 177         return block_write_full_page(page, udf_get_block, wbc);
 178 }
 179
 180 static int udf_writepages(struct address_space *mapping,
 181                         struct writeback_control *wbc)
 182 {
 183         return mpage_writepages(mapping, wbc, udf_get_block);
 184 }
 185
 186 static int udf_readpage(struct file *file, struct page *page)
 187 {
 188         return mpage_readpage(page, udf_get_block);
 189 }
 190
 191 static int udf_readpages(struct file *file, struct address_space *mapping,
 192                         struct list_head *pages, unsigned nr_pages)
 193 {
 194         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 195 }
 196
 197 static int udf_write_begin(struct file *file, struct address_space *mapping,
 198                         loff_t pos, unsigned len, unsigned flags,
 199                         struct page **pagep, void **fsdata)
 200 {
 201         int ret;
 202
 203         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 204         if (unlikely(ret))
 205                 udf_write_failed(mapping, pos + len);
 206         return ret;
 207 }
 208
 209 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 210 {
 211         struct file *file = iocb->ki_filp;
 212         struct address_space *mapping = file->f_mapping;
 213         struct inode *inode = mapping->host;
 214         size_t count = iov_iter_count(iter);
 215         ssize_t ret;
 216
 217         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 218         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 219                 udf_write_failed(mapping, iocb->ki_pos + count);
 220         return ret;
 221 }
 222
 223 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 224 {
 225         return generic_block_bmap(mapping, block, udf_get_block);
 226 }
 227
 228 const struct address_space_operations udf_aops = {
 229         .readpage       = udf_readpage,
 230         .readpages      = udf_readpages,
 231         .writepage      = udf_writepage,
 232         .writepages     = udf_writepages,
 233         .write_begin    = udf_write_begin,
 234         .write_end      = generic_write_end,
 235         .direct_IO      = udf_direct_IO,
 236         .bmap           = udf_bmap,
 237 };
 238
 239 /*
 240  * Expand file stored in ICB to a normal one-block-file
 241  *
 242  * This function requires i_data_sem for writing and releases it.
 243  * This function requires i_mutex held
 244  */
 245 int udf_expand_file_adinicb(struct inode *inode)
 246 {
 247         struct page *page;
 248         char *kaddr;
 249         struct udf_inode_info *iinfo = UDF_I(inode);
 250         int err;
 251         struct writeback_control udf_wbc = {
 252                 .sync_mode = WB_SYNC_NONE,
 253                 .nr_to_write = 1,
 254         };
 255
 256         WARN_ON_ONCE(!inode_is_locked(inode));
 257         if (!iinfo->i_lenAlloc) {
 258                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 259                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 260                 else
 261                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 262                 /* from now on we have normal address_space methods */
 263                 inode->i_data.a_ops = &udf_aops;
 264                 up_write(&iinfo->i_data_sem);
 265                 mark_inode_dirty(inode);
 266                 return 0;
 267         }
 268         /*
 269          * Release i_data_sem so that we can lock a page - page lock ranks
 270          * above i_data_sem. i_mutex still protects us against file changes.
 271          */
 272         up_write(&iinfo->i_data_sem);
 273
 274         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 275         if (!page)
 276                 return -ENOMEM;
 277
 278         if (!PageUptodate(page)) {
 279                 kaddr = kmap_atomic(page);
 280                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 281                        PAGE_SIZE - iinfo->i_lenAlloc);
 282                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 283                         iinfo->i_lenAlloc);
 284                 flush_dcache_page(page);
 285                 SetPageUptodate(page);
 286                 kunmap_atomic(kaddr);
 287         }
 288         down_write(&iinfo->i_data_sem);
 289         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 290                iinfo->i_lenAlloc);
 291         iinfo->i_lenAlloc = 0;
 292         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 293                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 294         else
 295                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 296         /* from now on we have normal address_space methods */
 297         inode->i_data.a_ops = &udf_aops;
 298         up_write(&iinfo->i_data_sem);
 299         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 300         if (err) {
 301                 /* Restore everything back so that we don't lose data... */
 302                 lock_page(page);
 303                 down_write(&iinfo->i_data_sem);
 304                 kaddr = kmap_atomic(page);
 305                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 306                        inode->i_size);
 307                 kunmap_atomic(kaddr);
 308                 unlock_page(page);
 309                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 310                 inode->i_data.a_ops = &udf_adinicb_aops;
 311                 up_write(&iinfo->i_data_sem);
 312         }
 313         put_page(page);
 314         mark_inode_dirty(inode);
 315
 316         return err;
 317 }
 318
 319 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 320                                            int *err)
 321 {
 322         int newblock;
 323         struct buffer_head *dbh = NULL;
 324         struct kernel_lb_addr eloc;
 325         uint8_t alloctype;
 326         struct extent_position epos;
 327
 328         struct udf_fileident_bh sfibh, dfibh;
 329         loff_t f_pos = udf_ext0_offset(inode);
 330         int size = udf_ext0_offset(inode) + inode->i_size;
 331         struct fileIdentDesc cfi, *sfi, *dfi;
 332         struct udf_inode_info *iinfo = UDF_I(inode);
 333
 334         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 335                 alloctype = ICBTAG_FLAG_AD_SHORT;
 336         else
 337                 alloctype = ICBTAG_FLAG_AD_LONG;
 338
 339         if (!inode->i_size) {
 340                 iinfo->i_alloc_type = alloctype;
 341                 mark_inode_dirty(inode);
 342                 return NULL;
 343         }
 344
 345         /* alloc block, and copy data to it */
 346         *block = udf_new_block(inode->i_sb, inode,
 347                                iinfo->i_location.partitionReferenceNum,
 348                                iinfo->i_location.logicalBlockNum, err);
 349         if (!(*block))
 350                 return NULL;
 351         newblock = udf_get_pblock(inode->i_sb, *block,
 352                                   iinfo->i_location.partitionReferenceNum,
 353                                 0);
 354         if (!newblock)
 355                 return NULL;
 356         dbh = udf_tgetblk(inode->i_sb, newblock);
 357         if (!dbh)
 358                 return NULL;
 359         lock_buffer(dbh);
 360         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 361         set_buffer_uptodate(dbh);
 362         unlock_buffer(dbh);
 363         mark_buffer_dirty_inode(dbh, inode);
 364
 365         sfibh.soffset = sfibh.eoffset =
 366                         f_pos & (inode->i_sb->s_blocksize - 1);
 367         sfibh.sbh = sfibh.ebh = NULL;
 368         dfibh.soffset = dfibh.eoffset = 0;
 369         dfibh.sbh = dfibh.ebh = dbh;
 370         while (f_pos < size) {
 371                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 372                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 373                                          NULL, NULL, NULL);
 374                 if (!sfi) {
 375                         brelse(dbh);
 376                         return NULL;
 377                 }
 378                 iinfo->i_alloc_type = alloctype;
 379                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 380                 dfibh.soffset = dfibh.eoffset;
 381                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 382                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 383                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 384                                  sfi->fileIdent +
 385                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 386                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 387                         brelse(dbh);
 388                         return NULL;
 389                 }
 390         }
 391         mark_buffer_dirty_inode(dbh, inode);
 392
 393         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 394                 iinfo->i_lenAlloc);
 395         iinfo->i_lenAlloc = 0;
 396         eloc.logicalBlockNum = *block;
 397         eloc.partitionReferenceNum =
 398                                 iinfo->i_location.partitionReferenceNum;
 399         iinfo->i_lenExtents = inode->i_size;
 400         epos.bh = NULL;
 401         epos.block = iinfo->i_location;
 402         epos.offset = udf_file_entry_alloc_offset(inode);
 403         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 404         /* UniqueID stuff */
 405
 406         brelse(epos.bh);
 407         mark_inode_dirty(inode);
 408         return dbh;
 409 }
 410
 411 static int udf_get_block(struct inode *inode, sector_t block,
 412                          struct buffer_head *bh_result, int create)
 413 {
 414         int err, new;
 415         sector_t phys = 0;
 416         struct udf_inode_info *iinfo;
 417
 418         if (!create) {
 419                 phys = udf_block_map(inode, block);
 420                 if (phys)
 421                         map_bh(bh_result, inode->i_sb, phys);
 422                 return 0;
 423         }
 424
 425         err = -EIO;
 426         new = 0;
 427         iinfo = UDF_I(inode);
 428
 429         down_write(&iinfo->i_data_sem);
 430         if (block == iinfo->i_next_alloc_block + 1) {
 431                 iinfo->i_next_alloc_block++;
 432                 iinfo->i_next_alloc_goal++;
 433         }
 434
 435         udf_clear_extent_cache(inode);
 436         phys = inode_getblk(inode, block, &err, &new);
 437         if (!phys)
 438                 goto abort;
 439
 440         if (new)
 441                 set_buffer_new(bh_result);
 442         map_bh(bh_result, inode->i_sb, phys);
 443
 444 abort:
 445         up_write(&iinfo->i_data_sem);
 446         return err;
 447 }
 448
 449 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 450                                       int create, int *err)
 451 {
 452         struct buffer_head *bh;
 453         struct buffer_head dummy;
 454
 455         dummy.b_state = 0;
 456         dummy.b_blocknr = -1000;
 457         *err = udf_get_block(inode, block, &dummy, create);
 458         if (!*err && buffer_mapped(&dummy)) {
 459                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 460                 if (buffer_new(&dummy)) {
 461                         lock_buffer(bh);
 462                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 463                         set_buffer_uptodate(bh);
 464                         unlock_buffer(bh);
 465                         mark_buffer_dirty_inode(bh, inode);
 466                 }
 467                 return bh;
 468         }
 469
 470         return NULL;
 471 }
 472
 473 /* Extend the file by 'blocks' blocks, return the number of extents added */
 474 static int udf_do_extend_file(struct inode *inode,
 475                               struct extent_position *last_pos,
 476                               struct kernel_long_ad *last_ext,
 477                               sector_t blocks)
 478 {
 479         sector_t add;
 480         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 481         struct super_block *sb = inode->i_sb;
 482         struct kernel_lb_addr prealloc_loc = {};
 483         int prealloc_len = 0;
 484         struct udf_inode_info *iinfo;
 485         int err;
 486
 487         /* The previous extent is fake and we should not extend by anything
 488          * - there's nothing to do... */
 489         if (!blocks && fake)
 490                 return 0;
 491
 492         iinfo = UDF_I(inode);
 493         /* Round the last extent up to a multiple of block size */
 494         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 495                 last_ext->extLength =
 496                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 497                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 498                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 499                 iinfo->i_lenExtents =
 500                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 501                         ~(sb->s_blocksize - 1);
 502         }
 503
 504         /* Last extent are just preallocated blocks? */
 505         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 506                                                 EXT_NOT_RECORDED_ALLOCATED) {
 507                 /* Save the extent so that we can reattach it to the end */
 508                 prealloc_loc = last_ext->extLocation;
 509                 prealloc_len = last_ext->extLength;
 510                 /* Mark the extent as a hole */
 511                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 512                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 513                 last_ext->extLocation.logicalBlockNum = 0;
 514                 last_ext->extLocation.partitionReferenceNum = 0;
 515         }
 516
 517         /* Can we merge with the previous extent? */
 518         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 519                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 520                 add = ((1 << 30) - sb->s_blocksize -
 521                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 522                         sb->s_blocksize_bits;
 523                 if (add > blocks)
 524                         add = blocks;
 525                 blocks -= add;
 526                 last_ext->extLength += add << sb->s_blocksize_bits;
 527         }
 528
 529         if (fake) {
 530                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 531                              last_ext->extLength, 1);
 532                 count++;
 533         } else {
 534                 struct kernel_lb_addr tmploc;
 535                 uint32_t tmplen;
 536
 537                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 538                                 last_ext->extLength, 1);
 539                 /*
 540                  * We've rewritten the last extent but there may be empty
 541                  * indirect extent after it - enter it.
 542                  */
 543                 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 544         }
 545
 546         /* Managed to do everything necessary? */
 547         if (!blocks)
 548                 goto out;
 549
 550         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 551         last_ext->extLocation.logicalBlockNum = 0;
 552         last_ext->extLocation.partitionReferenceNum = 0;
 553         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 554         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 555                                 (add << sb->s_blocksize_bits);
 556
 557         /* Create enough extents to cover the whole hole */
 558         while (blocks > add) {
 559                 blocks -= add;
 560                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 561                                    last_ext->extLength, 1);
 562                 if (err)
 563                         return err;
 564                 count++;
 565         }
 566         if (blocks) {
 567                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 568                         (blocks << sb->s_blocksize_bits);
 569                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 570                                    last_ext->extLength, 1);
 571                 if (err)
 572                         return err;
 573                 count++;
 574         }
 575
 576 out:
 577         /* Do we have some preallocated blocks saved? */
 578         if (prealloc_len) {
 579                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 580                                    prealloc_len, 1);
 581                 if (err)
 582                         return err;
 583                 last_ext->extLocation = prealloc_loc;
 584                 last_ext->extLength = prealloc_len;
 585                 count++;
 586         }
 587
 588         /* last_pos should point to the last written extent... */
 589         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 590                 last_pos->offset -= sizeof(struct short_ad);
 591         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 592                 last_pos->offset -= sizeof(struct long_ad);
 593         else
 594                 return -EIO;
 595
 596         return count;
 597 }
 598
 599 static int udf_extend_file(struct inode *inode, loff_t newsize)
 600 {
 601
 602         struct extent_position epos;
 603         struct kernel_lb_addr eloc;
 604         uint32_t elen;
 605         int8_t etype;
 606         struct super_block *sb = inode->i_sb;
 607         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 608         int adsize;
 609         struct udf_inode_info *iinfo = UDF_I(inode);
 610         struct kernel_long_ad extent;
 611         int err;
 612
 613         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 614                 adsize = sizeof(struct short_ad);
 615         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 616                 adsize = sizeof(struct long_ad);
 617         else
 618                 BUG();
 619
 620         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 621
 622         /* File has extent covering the new size (could happen when extending
 623          * inside a block)? */
 624         if (etype != -1)
 625                 return 0;
 626         if (newsize & (sb->s_blocksize - 1))
 627                 offset++;
 628         /* Extended file just to the boundary of the last file block? */
 629         if (offset == 0)
 630                 return 0;
 631
 632         /* Truncate is extending the file by 'offset' blocks */
 633         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 634             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 635                 /* File has no extents at all or has empty last
 636                  * indirect extent! Create a fake extent... */
 637                 extent.extLocation.logicalBlockNum = 0;
 638                 extent.extLocation.partitionReferenceNum = 0;
 639                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 640         } else {
 641                 epos.offset -= adsize;
 642                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 643                                       &extent.extLength, 0);
 644                 extent.extLength |= etype << 30;
 645         }
 646         err = udf_do_extend_file(inode, &epos, &extent, offset);
 647         if (err < 0)
 648                 goto out;
 649         err = 0;
 650         iinfo->i_lenExtents = newsize;
 651 out:
 652         brelse(epos.bh);
 653         return err;
 654 }
 655
 656 static sector_t inode_getblk(struct inode *inode, sector_t block,
 657                              int *err, int *new)
 658 {
 659         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 660         struct extent_position prev_epos, cur_epos, next_epos;
 661         int count = 0, startnum = 0, endnum = 0;
 662         uint32_t elen = 0, tmpelen;
 663         struct kernel_lb_addr eloc, tmpeloc;
 664         int c = 1;
 665         loff_t lbcount = 0, b_off = 0;
 666         uint32_t newblocknum, newblock;
 667         sector_t offset = 0;
 668         int8_t etype;
 669         struct udf_inode_info *iinfo = UDF_I(inode);
 670         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 671         int lastblock = 0;
 672         bool isBeyondEOF;
 673
 674         *err = 0;
 675         *new = 0;
 676         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 677         prev_epos.block = iinfo->i_location;
 678         prev_epos.bh = NULL;
 679         cur_epos = next_epos = prev_epos;
 680         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 681
 682         /* find the extent which contains the block we are looking for.
 683            alternate between laarr[0] and laarr[1] for locations of the
 684            current extent, and the previous extent */
 685         do {
 686                 if (prev_epos.bh != cur_epos.bh) {
 687                         brelse(prev_epos.bh);
 688                         get_bh(cur_epos.bh);
 689                         prev_epos.bh = cur_epos.bh;
 690                 }
 691                 if (cur_epos.bh != next_epos.bh) {
 692                         brelse(cur_epos.bh);
 693                         get_bh(next_epos.bh);
 694                         cur_epos.bh = next_epos.bh;
 695                 }
 696
 697                 lbcount += elen;
 698
 699                 prev_epos.block = cur_epos.block;
 700                 cur_epos.block = next_epos.block;
 701
 702                 prev_epos.offset = cur_epos.offset;
 703                 cur_epos.offset = next_epos.offset;
 704
 705                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 706                 if (etype == -1)
 707                         break;
 708
 709                 c = !c;
 710
 711                 laarr[c].extLength = (etype << 30) | elen;
 712                 laarr[c].extLocation = eloc;
 713
 714                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 715                         pgoal = eloc.logicalBlockNum +
 716                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 717                                  inode->i_sb->s_blocksize_bits);
 718
 719                 count++;
 720         } while (lbcount + elen <= b_off);
 721
 722         b_off -= lbcount;
 723         offset = b_off >> inode->i_sb->s_blocksize_bits;
 724         /*
 725          * Move prev_epos and cur_epos into indirect extent if we are at
 726          * the pointer to it
 727          */
 728         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 729         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 730
 731         /* if the extent is allocated and recorded, return the block
 732            if the extent is not a multiple of the blocksize, round up */
 733
 734         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 735                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 736                         elen = EXT_RECORDED_ALLOCATED |
 737                                 ((elen + inode->i_sb->s_blocksize - 1) &
 738                                  ~(inode->i_sb->s_blocksize - 1));
 739                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 740                 }
 741                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 742                 goto out_free;
 743         }
 744
 745         /* Are we beyond EOF? */
 746         if (etype == -1) {
 747                 int ret;
 748                 isBeyondEOF = true;
 749                 if (count) {
 750                         if (c)
 751                                 laarr[0] = laarr[1];
 752                         startnum = 1;
 753                 } else {
 754                         /* Create a fake extent when there's not one */
 755                         memset(&laarr[0].extLocation, 0x00,
 756                                 sizeof(struct kernel_lb_addr));
 757                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 758                         /* Will udf_do_extend_file() create real extent from
 759                            a fake one? */
 760                         startnum = (offset > 0);
 761                 }
 762                 /* Create extents for the hole between EOF and offset */
 763                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 764                 if (ret < 0) {
 765                         *err = ret;
 766                         newblock = 0;
 767                         goto out_free;
 768                 }
 769                 c = 0;
 770                 offset = 0;
 771                 count += ret;
 772                 /* We are not covered by a preallocated extent? */
 773                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 774                                                 EXT_NOT_RECORDED_ALLOCATED) {
 775                         /* Is there any real extent? - otherwise we overwrite
 776                          * the fake one... */
 777                         if (count)
 778                                 c = !c;
 779                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 780                                 inode->i_sb->s_blocksize;
 781                         memset(&laarr[c].extLocation, 0x00,
 782                                 sizeof(struct kernel_lb_addr));
 783                         count++;
 784                 }
 785                 endnum = c + 1;
 786                 lastblock = 1;
 787         } else {
 788                 isBeyondEOF = false;
 789                 endnum = startnum = ((count > 2) ? 2 : count);
 790
 791                 /* if the current extent is in position 0,
 792                    swap it with the previous */
 793                 if (!c && count != 1) {
 794                         laarr[2] = laarr[0];
 795                         laarr[0] = laarr[1];
 796                         laarr[1] = laarr[2];
 797                         c = 1;
 798                 }
 799
 800                 /* if the current block is located in an extent,
 801                    read the next extent */
 802                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 803                 if (etype != -1) {
 804                         laarr[c + 1].extLength = (etype << 30) | elen;
 805                         laarr[c + 1].extLocation = eloc;
 806                         count++;
 807                         startnum++;
 808                         endnum++;
 809                 } else
 810                         lastblock = 1;
 811         }
 812
 813         /* if the current extent is not recorded but allocated, get the
 814          * block in the extent corresponding to the requested block */
 815         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 816                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 817         else { /* otherwise, allocate a new block */
 818                 if (iinfo->i_next_alloc_block == block)
 819                         goal = iinfo->i_next_alloc_goal;
 820
 821                 if (!goal) {
 822                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 823                                 goal = iinfo->i_location.logicalBlockNum + 1;
 824                 }
 825
 826                 newblocknum = udf_new_block(inode->i_sb, inode,
 827                                 iinfo->i_location.partitionReferenceNum,
 828                                 goal, err);
 829                 if (!newblocknum) {
 830                         *err = -ENOSPC;
 831                         newblock = 0;
 832                         goto out_free;
 833                 }
 834                 if (isBeyondEOF)
 835                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 836         }
 837
 838         /* if the extent the requsted block is located in contains multiple
 839          * blocks, split the extent into at most three extents. blocks prior
 840          * to requested block, requested block, and blocks after requested
 841          * block */
 842         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 843
 844         /* We preallocate blocks only for regular files. It also makes sense
 845          * for directories but there's a problem when to drop the
 846          * preallocation. We might use some delayed work for that but I feel
 847          * it's overengineering for a filesystem like UDF. */
 848         if (S_ISREG(inode->i_mode))
 849                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 850
 851         /* merge any continuous blocks in laarr */
 852         udf_merge_extents(inode, laarr, &endnum);
 853
 854         /* write back the new extents, inserting new extents if the new number
 855          * of extents is greater than the old number, and deleting extents if
 856          * the new number of extents is less than the old number */
 857         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 858
 859         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 860                                 iinfo->i_location.partitionReferenceNum, 0);
 861         if (!newblock) {
 862                 *err = -EIO;
 863                 goto out_free;
 864         }
 865         *new = 1;
 866         iinfo->i_next_alloc_block = block;
 867         iinfo->i_next_alloc_goal = newblocknum;
 868         inode->i_ctime = current_time(inode);
 869
 870         if (IS_SYNC(inode))
 871                 udf_sync_inode(inode);
 872         else
 873                 mark_inode_dirty(inode);
 874 out_free:
 875         brelse(prev_epos.bh);
 876         brelse(cur_epos.bh);
 877         brelse(next_epos.bh);
 878         return newblock;
 879 }
 880
 881 static void udf_split_extents(struct inode *inode, int *c, int offset,
 882                               int newblocknum, struct kernel_long_ad *laarr,
 883                               int *endnum)
 884 {
 885         unsigned long blocksize = inode->i_sb->s_blocksize;
 886         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 887
 888         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 889             (laarr[*c].extLength >> 30) ==
 890                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 891                 int curr = *c;
 892                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 893                             blocksize - 1) >> blocksize_bits;
 894                 int8_t etype = (laarr[curr].extLength >> 30);
 895
 896                 if (blen == 1)
 897                         ;
 898                 else if (!offset || blen == offset + 1) {
 899                         laarr[curr + 2] = laarr[curr + 1];
 900                         laarr[curr + 1] = laarr[curr];
 901                 } else {
 902                         laarr[curr + 3] = laarr[curr + 1];
 903                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 904                 }
 905
 906                 if (offset) {
 907                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 908                                 udf_free_blocks(inode->i_sb, inode,
 909                                                 &laarr[curr].extLocation,
 910                                                 0, offset);
 911                                 laarr[curr].extLength =
 912                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 913                                         (offset << blocksize_bits);
 914                                 laarr[curr].extLocation.logicalBlockNum = 0;
 915                                 laarr[curr].extLocation.
 916                                                 partitionReferenceNum = 0;
 917                         } else
 918                                 laarr[curr].extLength = (etype << 30) |
 919                                         (offset << blocksize_bits);
 920                         curr++;
 921                         (*c)++;
 922                         (*endnum)++;
 923                 }
 924
 925                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 926                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 927                         laarr[curr].extLocation.partitionReferenceNum =
 928                                 UDF_I(inode)->i_location.partitionReferenceNum;
 929                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 930                         blocksize;
 931                 curr++;
 932
 933                 if (blen != offset + 1) {
 934                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 935                                 laarr[curr].extLocation.logicalBlockNum +=
 936                                                                 offset + 1;
 937                         laarr[curr].extLength = (etype << 30) |
 938                                 ((blen - (offset + 1)) << blocksize_bits);
 939                         curr++;
 940                         (*endnum)++;
 941                 }
 942         }
 943 }
 944
 945 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 946                                  struct kernel_long_ad *laarr,
 947                                  int *endnum)
 948 {
 949         int start, length = 0, currlength = 0, i;
 950
 951         if (*endnum >= (c + 1)) {
 952                 if (!lastblock)
 953                         return;
 954                 else
 955                         start = c;
 956         } else {
 957                 if ((laarr[c + 1].extLength >> 30) ==
 958                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 959                         start = c + 1;
 960                         length = currlength =
 961                                 (((laarr[c + 1].extLength &
 962                                         UDF_EXTENT_LENGTH_MASK) +
 963                                 inode->i_sb->s_blocksize - 1) >>
 964                                 inode->i_sb->s_blocksize_bits);
 965                 } else
 966                         start = c;
 967         }
 968
 969         for (i = start + 1; i <= *endnum; i++) {
 970                 if (i == *endnum) {
 971                         if (lastblock)
 972                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 973                 } else if ((laarr[i].extLength >> 30) ==
 974                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 975                         length += (((laarr[i].extLength &
 976                                                 UDF_EXTENT_LENGTH_MASK) +
 977                                     inode->i_sb->s_blocksize - 1) >>
 978                                     inode->i_sb->s_blocksize_bits);
 979                 } else
 980                         break;
 981         }
 982
 983         if (length) {
 984                 int next = laarr[start].extLocation.logicalBlockNum +
 985                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 986                           inode->i_sb->s_blocksize - 1) >>
 987                           inode->i_sb->s_blocksize_bits);
 988                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 989                                 laarr[start].extLocation.partitionReferenceNum,
 990                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 991                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 992                                 currlength);
 993                 if (numalloc)   {
 994                         if (start == (c + 1))
 995                                 laarr[start].extLength +=
 996                                         (numalloc <<
 997                                          inode->i_sb->s_blocksize_bits);
 998                         else {
 999                                 memmove(&laarr[c + 2], &laarr[c + 1],
1000                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1001                                 (*endnum)++;
1002                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1003                                 laarr[c + 1].extLocation.partitionReferenceNum =
1004                                         laarr[c].extLocation.
1005                                                         partitionReferenceNum;
1006                                 laarr[c + 1].extLength =
1007                                         EXT_NOT_RECORDED_ALLOCATED |
1008                                         (numalloc <<
1009                                          inode->i_sb->s_blocksize_bits);
1010                                 start = c + 1;
1011                         }
1012
1013                         for (i = start + 1; numalloc && i < *endnum; i++) {
1014                                 int elen = ((laarr[i].extLength &
1015                                                 UDF_EXTENT_LENGTH_MASK) +
1016                                             inode->i_sb->s_blocksize - 1) >>
1017                                             inode->i_sb->s_blocksize_bits;
1018
1019                                 if (elen > numalloc) {
1020                                         laarr[i].extLength -=
1021                                                 (numalloc <<
1022                                                  inode->i_sb->s_blocksize_bits);
1023                                         numalloc = 0;
1024                                 } else {
1025                                         numalloc -= elen;
1026                                         if (*endnum > (i + 1))
1027                                                 memmove(&laarr[i],
1028                                                         &laarr[i + 1],
1029                                                         sizeof(struct long_ad) *
1030                                                         (*endnum - (i + 1)));
1031                                         i--;
1032                                         (*endnum)--;
1033                                 }
1034                         }
1035                         UDF_I(inode)->i_lenExtents +=
1036                                 numalloc << inode->i_sb->s_blocksize_bits;
1037                 }
1038         }
1039 }
1040
1041 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1042                               int *endnum)
1043 {
1044         int i;
1045         unsigned long blocksize = inode->i_sb->s_blocksize;
1046         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1047
1048         for (i = 0; i < (*endnum - 1); i++) {
1049                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1050                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1051
1052                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1053                         (((li->extLength >> 30) ==
1054                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1055                         ((lip1->extLocation.logicalBlockNum -
1056                           li->extLocation.logicalBlockNum) ==
1057                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1058                         blocksize - 1) >> blocksize_bits)))) {
1059
1060                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1061                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1062                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1063                                 lip1->extLength = (lip1->extLength -
1064                                                   (li->extLength &
1065                                                    UDF_EXTENT_LENGTH_MASK) +
1066                                                    UDF_EXTENT_LENGTH_MASK) &
1067                                                         ~(blocksize - 1);
1068                                 li->extLength = (li->extLength &
1069                                                  UDF_EXTENT_FLAG_MASK) +
1070                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1071                                                 blocksize;
1072                                 lip1->extLocation.logicalBlockNum =
1073                                         li->extLocation.logicalBlockNum +
1074                                         ((li->extLength &
1075                                                 UDF_EXTENT_LENGTH_MASK) >>
1076                                                 blocksize_bits);
1077                         } else {
1078                                 li->extLength = lip1->extLength +
1079                                         (((li->extLength &
1080                                                 UDF_EXTENT_LENGTH_MASK) +
1081                                          blocksize - 1) & ~(blocksize - 1));
1082                                 if (*endnum > (i + 2))
1083                                         memmove(&laarr[i + 1], &laarr[i + 2],
1084                                                 sizeof(struct long_ad) *
1085                                                 (*endnum - (i + 2)));
1086                                 i--;
1087                                 (*endnum)--;
1088                         }
1089                 } else if (((li->extLength >> 30) ==
1090                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1091                            ((lip1->extLength >> 30) ==
1092                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1093                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1094                                         ((li->extLength &
1095                                           UDF_EXTENT_LENGTH_MASK) +
1096                                          blocksize - 1) >> blocksize_bits);
1097                         li->extLocation.logicalBlockNum = 0;
1098                         li->extLocation.partitionReferenceNum = 0;
1099
1100                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1101                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1102                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1103                                 lip1->extLength = (lip1->extLength -
1104                                                    (li->extLength &
1105                                                    UDF_EXTENT_LENGTH_MASK) +
1106                                                    UDF_EXTENT_LENGTH_MASK) &
1107                                                    ~(blocksize - 1);
1108                                 li->extLength = (li->extLength &
1109                                                  UDF_EXTENT_FLAG_MASK) +
1110                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1111                                                 blocksize;
1112                         } else {
1113                                 li->extLength = lip1->extLength +
1114                                         (((li->extLength &
1115                                                 UDF_EXTENT_LENGTH_MASK) +
1116                                           blocksize - 1) & ~(blocksize - 1));
1117                                 if (*endnum > (i + 2))
1118                                         memmove(&laarr[i + 1], &laarr[i + 2],
1119                                                 sizeof(struct long_ad) *
1120                                                 (*endnum - (i + 2)));
1121                                 i--;
1122                                 (*endnum)--;
1123                         }
1124                 } else if ((li->extLength >> 30) ==
1125                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1126                         udf_free_blocks(inode->i_sb, inode,
1127                                         &li->extLocation, 0,
1128                                         ((li->extLength &
1129                                                 UDF_EXTENT_LENGTH_MASK) +
1130                                          blocksize - 1) >> blocksize_bits);
1131                         li->extLocation.logicalBlockNum = 0;
1132                         li->extLocation.partitionReferenceNum = 0;
1133                         li->extLength = (li->extLength &
1134                                                 UDF_EXTENT_LENGTH_MASK) |
1135                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1136                 }
1137         }
1138 }
1139
1140 static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1141                                int startnum, int endnum,
1142                                struct extent_position *epos)
1143 {
1144         int start = 0, i;
1145         struct kernel_lb_addr tmploc;
1146         uint32_t tmplen;
1147
1148         if (startnum > endnum) {
1149                 for (i = 0; i < (startnum - endnum); i++)
1150                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1151                                         laarr[i].extLength);
1152         } else if (startnum < endnum) {
1153                 for (i = 0; i < (endnum - startnum); i++) {
1154                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1155                                         laarr[i].extLength);
1156                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1157                                       &laarr[i].extLength, 1);
1158                         start++;
1159                 }
1160         }
1161
1162         for (i = start; i < endnum; i++) {
1163                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1164                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1165                                laarr[i].extLength, 1);
1166         }
1167 }
1168
1169 struct buffer_head *udf_bread(struct inode *inode, int block,
1170                               int create, int *err)
1171 {
1172         struct buffer_head *bh = NULL;
1173
1174         bh = udf_getblk(inode, block, create, err);
1175         if (!bh)
1176                 return NULL;
1177
1178         if (buffer_uptodate(bh))
1179                 return bh;
1180
1181         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1182
1183         wait_on_buffer(bh);
1184         if (buffer_uptodate(bh))
1185                 return bh;
1186
1187         brelse(bh);
1188         *err = -EIO;
1189         return NULL;
1190 }
1191
1192 int udf_setsize(struct inode *inode, loff_t newsize)
1193 {
1194         int err;
1195         struct udf_inode_info *iinfo;
1196         int bsize = i_blocksize(inode);
1197
1198         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1199               S_ISLNK(inode->i_mode)))
1200                 return -EINVAL;
1201         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1202                 return -EPERM;
1203
1204         iinfo = UDF_I(inode);
1205         if (newsize > inode->i_size) {
1206                 down_write(&iinfo->i_data_sem);
1207                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1208                         if (bsize <
1209                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1210                                 err = udf_expand_file_adinicb(inode);
1211                                 if (err)
1212                                         return err;
1213                                 down_write(&iinfo->i_data_sem);
1214                         } else {
1215                                 iinfo->i_lenAlloc = newsize;
1216                                 goto set_size;
1217                         }
1218                 }
1219                 err = udf_extend_file(inode, newsize);
1220                 if (err) {
1221                         up_write(&iinfo->i_data_sem);
1222                         return err;
1223                 }
1224 set_size:
1225                 up_write(&iinfo->i_data_sem);
1226                 truncate_setsize(inode, newsize);
1227         } else {
1228                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1229                         down_write(&iinfo->i_data_sem);
1230                         udf_clear_extent_cache(inode);
1231                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1232                                0x00, bsize - newsize -
1233                                udf_file_entry_alloc_offset(inode));
1234                         iinfo->i_lenAlloc = newsize;
1235                         truncate_setsize(inode, newsize);
1236                         up_write(&iinfo->i_data_sem);
1237                         goto update_time;
1238                 }
1239                 err = block_truncate_page(inode->i_mapping, newsize,
1240                                           udf_get_block);
1241                 if (err)
1242                         return err;
1243                 truncate_setsize(inode, newsize);
1244                 down_write(&iinfo->i_data_sem);
1245                 udf_clear_extent_cache(inode);
1246                 udf_truncate_extents(inode);
1247                 up_write(&iinfo->i_data_sem);
1248         }
1249 update_time:
1250         inode->i_mtime = inode->i_ctime = current_time(inode);
1251         if (IS_SYNC(inode))
1252                 udf_sync_inode(inode);
1253         else
1254                 mark_inode_dirty(inode);
1255         return 0;
1256 }
1257
1258 /*
1259  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1260  * arbitrary - just that we hopefully don't limit any real use of rewritten
1261  * inode on write-once media but avoid looping for too long on corrupted media.
1262  */
1263 #define UDF_MAX_ICB_NESTING 1024
1264
1265 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1266 {
1267         struct buffer_head *bh = NULL;
1268         struct fileEntry *fe;
1269         struct extendedFileEntry *efe;
1270         uint16_t ident;
1271         struct udf_inode_info *iinfo = UDF_I(inode);
1272         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1273         struct kernel_lb_addr *iloc = &iinfo->i_location;
1274         unsigned int link_count;
1275         unsigned int indirections = 0;
1276         int bs = inode->i_sb->s_blocksize;
1277         int ret = -EIO;
1278
1279 reread:
1280         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1281                 udf_debug("partition reference: %d > logical volume partitions: %d\n",
1282                           iloc->partitionReferenceNum, sbi->s_partitions);
1283                 return -EIO;
1284         }
1285
1286         if (iloc->logicalBlockNum >=
1287             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1288                 udf_debug("block=%d, partition=%d out of range\n",
1289                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1290                 return -EIO;
1291         }
1292
1293         /*
1294          * Set defaults, but the inode is still incomplete!
1295          * Note: get_new_inode() sets the following on a new inode:
1296          *      i_sb = sb
1297          *      i_no = ino
1298          *      i_flags = sb->s_flags
1299          *      i_state = 0
1300          * clean_inode(): zero fills and sets
1301          *      i_count = 1
1302          *      i_nlink = 1
1303          *      i_op = NULL;
1304          */
1305         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1306         if (!bh) {
1307                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1308                 return -EIO;
1309         }
1310
1311         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1312             ident != TAG_IDENT_USE) {
1313                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1314                         inode->i_ino, ident);
1315                 goto out;
1316         }
1317
1318         fe = (struct fileEntry *)bh->b_data;
1319         efe = (struct extendedFileEntry *)bh->b_data;
1320
1321         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1322                 struct buffer_head *ibh;
1323
1324                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1325                 if (ident == TAG_IDENT_IE && ibh) {
1326                         struct kernel_lb_addr loc;
1327                         struct indirectEntry *ie;
1328
1329                         ie = (struct indirectEntry *)ibh->b_data;
1330                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1331
1332                         if (ie->indirectICB.extLength) {
1333                                 brelse(ibh);
1334                                 memcpy(&iinfo->i_location, &loc,
1335                                        sizeof(struct kernel_lb_addr));
1336                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1337                                         udf_err(inode->i_sb,
1338                                                 "too many ICBs in ICB hierarchy"
1339                                                 " (max %d supported)\n",
1340                                                 UDF_MAX_ICB_NESTING);
1341                                         goto out;
1342                                 }
1343                                 brelse(bh);
1344                                 goto reread;
1345                         }
1346                 }
1347                 brelse(ibh);
1348         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1349                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1350                         le16_to_cpu(fe->icbTag.strategyType));
1351                 goto out;
1352         }
1353         if (fe->icbTag.strategyType == cpu_to_le16(4))
1354                 iinfo->i_strat4096 = 0;
1355         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1356                 iinfo->i_strat4096 = 1;
1357
1358         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1359                                                         ICBTAG_FLAG_AD_MASK;
1360         iinfo->i_unique = 0;
1361         iinfo->i_lenEAttr = 0;
1362         iinfo->i_lenExtents = 0;
1363         iinfo->i_lenAlloc = 0;
1364         iinfo->i_next_alloc_block = 0;
1365         iinfo->i_next_alloc_goal = 0;
1366         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1367                 iinfo->i_efe = 1;
1368                 iinfo->i_use = 0;
1369                 ret = udf_alloc_i_data(inode, bs -
1370                                         sizeof(struct extendedFileEntry));
1371                 if (ret)
1372                         goto out;
1373                 memcpy(iinfo->i_ext.i_data,
1374                        bh->b_data + sizeof(struct extendedFileEntry),
1375                        bs - sizeof(struct extendedFileEntry));
1376         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1377                 iinfo->i_efe = 0;
1378                 iinfo->i_use = 0;
1379                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1380                 if (ret)
1381                         goto out;
1382                 memcpy(iinfo->i_ext.i_data,
1383                        bh->b_data + sizeof(struct fileEntry),
1384                        bs - sizeof(struct fileEntry));
1385         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1386                 iinfo->i_efe = 0;
1387                 iinfo->i_use = 1;
1388                 iinfo->i_lenAlloc = le32_to_cpu(
1389                                 ((struct unallocSpaceEntry *)bh->b_data)->
1390                                  lengthAllocDescs);
1391                 ret = udf_alloc_i_data(inode, bs -
1392                                         sizeof(struct unallocSpaceEntry));
1393                 if (ret)
1394                         goto out;
1395                 memcpy(iinfo->i_ext.i_data,
1396                        bh->b_data + sizeof(struct unallocSpaceEntry),
1397                        bs - sizeof(struct unallocSpaceEntry));
1398                 return 0;
1399         }
1400
1401         ret = -EIO;
1402         read_lock(&sbi->s_cred_lock);
1403         i_uid_write(inode, le32_to_cpu(fe->uid));
1404         if (!uid_valid(inode->i_uid) ||
1405             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1406             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1407                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1408
1409         i_gid_write(inode, le32_to_cpu(fe->gid));
1410         if (!gid_valid(inode->i_gid) ||
1411             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1412             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1413                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1414
1415         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1416                         sbi->s_fmode != UDF_INVALID_MODE)
1417                 inode->i_mode = sbi->s_fmode;
1418         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1419                         sbi->s_dmode != UDF_INVALID_MODE)
1420                 inode->i_mode = sbi->s_dmode;
1421         else
1422                 inode->i_mode = udf_convert_permissions(fe);
1423         inode->i_mode &= ~sbi->s_umask;
1424         read_unlock(&sbi->s_cred_lock);
1425
1426         link_count = le16_to_cpu(fe->fileLinkCount);
1427         if (!link_count) {
1428                 if (!hidden_inode) {
1429                         ret = -ESTALE;
1430                         goto out;
1431                 }
1432                 link_count = 1;
1433         }
1434         set_nlink(inode, link_count);
1435
1436         inode->i_size = le64_to_cpu(fe->informationLength);
1437         iinfo->i_lenExtents = inode->i_size;
1438
1439         if (iinfo->i_efe == 0) {
1440                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1441                         (inode->i_sb->s_blocksize_bits - 9);
1442
1443                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1444                         inode->i_atime = sbi->s_record_time;
1445
1446                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1447                                             fe->modificationTime))
1448                         inode->i_mtime = sbi->s_record_time;
1449
1450                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1451                         inode->i_ctime = sbi->s_record_time;
1452
1453                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1454                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1455                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1456                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1457         } else {
1458                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1459                     (inode->i_sb->s_blocksize_bits - 9);
1460
1461                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1462                         inode->i_atime = sbi->s_record_time;
1463
1464                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1465                                             efe->modificationTime))
1466                         inode->i_mtime = sbi->s_record_time;
1467
1468                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1469                         iinfo->i_crtime = sbi->s_record_time;
1470
1471                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1472                         inode->i_ctime = sbi->s_record_time;
1473
1474                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1475                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1476                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1477                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1478         }
1479         inode->i_generation = iinfo->i_unique;
1480
1481         /*
1482          * Sanity check length of allocation descriptors and extended attrs to
1483          * avoid integer overflows
1484          */
1485         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1486                 goto out;
1487         /* Now do exact checks */
1488         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1489                 goto out;
1490         /* Sanity checks for files in ICB so that we don't get confused later */
1491         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1492                 /*
1493                  * For file in ICB data is stored in allocation descriptor
1494                  * so sizes should match
1495                  */
1496                 if (iinfo->i_lenAlloc != inode->i_size)
1497                         goto out;
1498                 /* File in ICB has to fit in there... */
1499                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1500                         goto out;
1501         }
1502
1503         switch (fe->icbTag.fileType) {
1504         case ICBTAG_FILE_TYPE_DIRECTORY:
1505                 inode->i_op = &udf_dir_inode_operations;
1506                 inode->i_fop = &udf_dir_operations;
1507                 inode->i_mode |= S_IFDIR;
1508                 inc_nlink(inode);
1509                 break;
1510         case ICBTAG_FILE_TYPE_REALTIME:
1511         case ICBTAG_FILE_TYPE_REGULAR:
1512         case ICBTAG_FILE_TYPE_UNDEF:
1513         case ICBTAG_FILE_TYPE_VAT20:
1514                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1515                         inode->i_data.a_ops = &udf_adinicb_aops;
1516                 else
1517                         inode->i_data.a_ops = &udf_aops;
1518                 inode->i_op = &udf_file_inode_operations;
1519                 inode->i_fop = &udf_file_operations;
1520                 inode->i_mode |= S_IFREG;
1521                 break;
1522         case ICBTAG_FILE_TYPE_BLOCK:
1523                 inode->i_mode |= S_IFBLK;
1524                 break;
1525         case ICBTAG_FILE_TYPE_CHAR:
1526                 inode->i_mode |= S_IFCHR;
1527                 break;
1528         case ICBTAG_FILE_TYPE_FIFO:
1529                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1530                 break;
1531         case ICBTAG_FILE_TYPE_SOCKET:
1532                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1533                 break;
1534         case ICBTAG_FILE_TYPE_SYMLINK:
1535                 inode->i_data.a_ops = &udf_symlink_aops;
1536                 inode->i_op = &udf_symlink_inode_operations;
1537                 inode_nohighmem(inode);
1538                 inode->i_mode = S_IFLNK | 0777;
1539                 break;
1540         case ICBTAG_FILE_TYPE_MAIN:
1541                 udf_debug("METADATA FILE-----\n");
1542                 break;
1543         case ICBTAG_FILE_TYPE_MIRROR:
1544                 udf_debug("METADATA MIRROR FILE-----\n");
1545                 break;
1546         case ICBTAG_FILE_TYPE_BITMAP:
1547                 udf_debug("METADATA BITMAP FILE-----\n");
1548                 break;
1549         default:
1550                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1551                         inode->i_ino, fe->icbTag.fileType);
1552                 goto out;
1553         }
1554         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1555                 struct deviceSpec *dsea =
1556                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1557                 if (dsea) {
1558                         init_special_inode(inode, inode->i_mode,
1559                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1560                                       le32_to_cpu(dsea->minorDeviceIdent)));
1561                         /* Developer ID ??? */
1562                 } else
1563                         goto out;
1564         }
1565         ret = 0;
1566 out:
1567         brelse(bh);
1568         return ret;
1569 }
1570
1571 static int udf_alloc_i_data(struct inode *inode, size_t size)
1572 {
1573         struct udf_inode_info *iinfo = UDF_I(inode);
1574         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1575
1576         if (!iinfo->i_ext.i_data) {
1577                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1578                         inode->i_ino);
1579                 return -ENOMEM;
1580         }
1581
1582         return 0;
1583 }
1584
1585 static umode_t udf_convert_permissions(struct fileEntry *fe)
1586 {
1587         umode_t mode;
1588         uint32_t permissions;
1589         uint32_t flags;
1590
1591         permissions = le32_to_cpu(fe->permissions);
1592         flags = le16_to_cpu(fe->icbTag.flags);
1593
1594         mode =  ((permissions) & 0007) |
1595                 ((permissions >> 2) & 0070) |
1596                 ((permissions >> 4) & 0700) |
1597                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1598                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1599                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1600
1601         return mode;
1602 }
1603
1604 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1605 {
1606         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1607 }
1608
1609 static int udf_sync_inode(struct inode *inode)
1610 {
1611         return udf_update_inode(inode, 1);
1612 }
1613
1614 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec time)
1615 {
1616         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1617             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1618              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1619                 iinfo->i_crtime = time;
1620 }
1621
1622 static int udf_update_inode(struct inode *inode, int do_sync)
1623 {
1624         struct buffer_head *bh = NULL;
1625         struct fileEntry *fe;
1626         struct extendedFileEntry *efe;
1627         uint64_t lb_recorded;
1628         uint32_t udfperms;
1629         uint16_t icbflags;
1630         uint16_t crclen;
1631         int err = 0;
1632         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1633         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1634         struct udf_inode_info *iinfo = UDF_I(inode);
1635
1636         bh = udf_tgetblk(inode->i_sb,
1637                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1638         if (!bh) {
1639                 udf_debug("getblk failure\n");
1640                 return -EIO;
1641         }
1642
1643         lock_buffer(bh);
1644         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1645         fe = (struct fileEntry *)bh->b_data;
1646         efe = (struct extendedFileEntry *)bh->b_data;
1647
1648         if (iinfo->i_use) {
1649                 struct unallocSpaceEntry *use =
1650                         (struct unallocSpaceEntry *)bh->b_data;
1651
1652                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1653                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1654                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1655                                         sizeof(struct unallocSpaceEntry));
1656                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1657                 crclen = sizeof(struct unallocSpaceEntry);
1658
1659                 goto finish;
1660         }
1661
1662         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1663                 fe->uid = cpu_to_le32(-1);
1664         else
1665                 fe->uid = cpu_to_le32(i_uid_read(inode));
1666
1667         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1668                 fe->gid = cpu_to_le32(-1);
1669         else
1670                 fe->gid = cpu_to_le32(i_gid_read(inode));
1671
1672         udfperms = ((inode->i_mode & 0007)) |
1673                    ((inode->i_mode & 0070) << 2) |
1674                    ((inode->i_mode & 0700) << 4);
1675
1676         udfperms |= (le32_to_cpu(fe->permissions) &
1677                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1678                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1679                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1680         fe->permissions = cpu_to_le32(udfperms);
1681
1682         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1683                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1684         else
1685                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1686
1687         fe->informationLength = cpu_to_le64(inode->i_size);
1688
1689         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1690                 struct regid *eid;
1691                 struct deviceSpec *dsea =
1692                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1693                 if (!dsea) {
1694                         dsea = (struct deviceSpec *)
1695                                 udf_add_extendedattr(inode,
1696                                                      sizeof(struct deviceSpec) +
1697                                                      sizeof(struct regid), 12, 0x3);
1698                         dsea->attrType = cpu_to_le32(12);
1699                         dsea->attrSubtype = 1;
1700                         dsea->attrLength = cpu_to_le32(
1701                                                 sizeof(struct deviceSpec) +
1702                                                 sizeof(struct regid));
1703                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1704                 }
1705                 eid = (struct regid *)dsea->impUse;
1706                 memset(eid, 0, sizeof(struct regid));
1707                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1708                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1709                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1710                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1711                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1712         }
1713
1714         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1715                 lb_recorded = 0; /* No extents => no blocks! */
1716         else
1717                 lb_recorded =
1718                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1719                         (blocksize_bits - 9);
1720
1721         if (iinfo->i_efe == 0) {
1722                 memcpy(bh->b_data + sizeof(struct fileEntry),
1723                        iinfo->i_ext.i_data,
1724                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1725                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1726
1727                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1728                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1729                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1730                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1731                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1732                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1733                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1734                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1735                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1736                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1737                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1738                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1739                 crclen = sizeof(struct fileEntry);
1740         } else {
1741                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1742                        iinfo->i_ext.i_data,
1743                        inode->i_sb->s_blocksize -
1744                                         sizeof(struct extendedFileEntry));
1745                 efe->objectSize = cpu_to_le64(inode->i_size);
1746                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1747
1748                 udf_adjust_time(iinfo, inode->i_atime);
1749                 udf_adjust_time(iinfo, inode->i_mtime);
1750                 udf_adjust_time(iinfo, inode->i_ctime);
1751
1752                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1753                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1754                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1755                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1756
1757                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1758                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1759                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1760                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1761                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1762                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1763                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1764                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1765                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1766                 crclen = sizeof(struct extendedFileEntry);
1767         }
1768
1769 finish:
1770         if (iinfo->i_strat4096) {
1771                 fe->icbTag.strategyType = cpu_to_le16(4096);
1772                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1773                 fe->icbTag.numEntries = cpu_to_le16(2);
1774         } else {
1775                 fe->icbTag.strategyType = cpu_to_le16(4);
1776                 fe->icbTag.numEntries = cpu_to_le16(1);
1777         }
1778
1779         if (iinfo->i_use)
1780                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1781         else if (S_ISDIR(inode->i_mode))
1782                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1783         else if (S_ISREG(inode->i_mode))
1784                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1785         else if (S_ISLNK(inode->i_mode))
1786                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1787         else if (S_ISBLK(inode->i_mode))
1788                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1789         else if (S_ISCHR(inode->i_mode))
1790                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1791         else if (S_ISFIFO(inode->i_mode))
1792                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1793         else if (S_ISSOCK(inode->i_mode))
1794                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1795
1796         icbflags =      iinfo->i_alloc_type |
1797                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1798                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1799                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1800                         (le16_to_cpu(fe->icbTag.flags) &
1801                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1802                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1803
1804         fe->icbTag.flags = cpu_to_le16(icbflags);
1805         if (sbi->s_udfrev >= 0x0200)
1806                 fe->descTag.descVersion = cpu_to_le16(3);
1807         else
1808                 fe->descTag.descVersion = cpu_to_le16(2);
1809         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1810         fe->descTag.tagLocation = cpu_to_le32(
1811                                         iinfo->i_location.logicalBlockNum);
1812         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1813         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1814         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1815                                                   crclen));
1816         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1817
1818         set_buffer_uptodate(bh);
1819         unlock_buffer(bh);
1820
1821         /* write the data blocks */
1822         mark_buffer_dirty(bh);
1823         if (do_sync) {
1824                 sync_dirty_buffer(bh);
1825                 if (buffer_write_io_error(bh)) {
1826                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1827                                  inode->i_ino);
1828                         err = -EIO;
1829                 }
1830         }
1831         brelse(bh);
1832
1833         return err;
1834 }
1835
1836 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1837                          bool hidden_inode)
1838 {
1839         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1840         struct inode *inode = iget_locked(sb, block);
1841         int err;
1842
1843         if (!inode)
1844                 return ERR_PTR(-ENOMEM);
1845
1846         if (!(inode->i_state & I_NEW))
1847                 return inode;
1848
1849         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1850         err = udf_read_inode(inode, hidden_inode);
1851         if (err < 0) {
1852                 iget_failed(inode);
1853                 return ERR_PTR(err);
1854         }
1855         unlock_new_inode(inode);
1856
1857         return inode;
1858 }
1859
1860 int udf_setup_indirect_aext(struct inode *inode, int block,
1861                             struct extent_position *epos)
1862 {
1863         struct super_block *sb = inode->i_sb;
1864         struct buffer_head *bh;
1865         struct allocExtDesc *aed;
1866         struct extent_position nepos;
1867         struct kernel_lb_addr neloc;
1868         int ver, adsize;
1869
1870         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1871                 adsize = sizeof(struct short_ad);
1872         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1873                 adsize = sizeof(struct long_ad);
1874         else
1875                 return -EIO;
1876
1877         neloc.logicalBlockNum = block;
1878         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1879
1880         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1881         if (!bh)
1882                 return -EIO;
1883         lock_buffer(bh);
1884         memset(bh->b_data, 0x00, sb->s_blocksize);
1885         set_buffer_uptodate(bh);
1886         unlock_buffer(bh);
1887         mark_buffer_dirty_inode(bh, inode);
1888
1889         aed = (struct allocExtDesc *)(bh->b_data);
1890         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1891                 aed->previousAllocExtLocation =
1892                                 cpu_to_le32(epos->block.logicalBlockNum);
1893         }
1894         aed->lengthAllocDescs = cpu_to_le32(0);
1895         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1896                 ver = 3;
1897         else
1898                 ver = 2;
1899         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1900                     sizeof(struct tag));
1901
1902         nepos.block = neloc;
1903         nepos.offset = sizeof(struct allocExtDesc);
1904         nepos.bh = bh;
1905
1906         /*
1907          * Do we have to copy current last extent to make space for indirect
1908          * one?
1909          */
1910         if (epos->offset + adsize > sb->s_blocksize) {
1911                 struct kernel_lb_addr cp_loc;
1912                 uint32_t cp_len;
1913                 int cp_type;
1914
1915                 epos->offset -= adsize;
1916                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1917                 cp_len |= ((uint32_t)cp_type) << 30;
1918
1919                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1920                 udf_write_aext(inode, epos, &nepos.block,
1921                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1922         } else {
1923                 __udf_add_aext(inode, epos, &nepos.block,
1924                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1925         }
1926
1927         brelse(epos->bh);
1928         *epos = nepos;
1929
1930         return 0;
1931 }
1932
1933 /*
1934  * Append extent at the given position - should be the first free one in inode
1935  * / indirect extent. This function assumes there is enough space in the inode
1936  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1937  */
1938 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1939                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1940 {
1941         struct udf_inode_info *iinfo = UDF_I(inode);
1942         struct allocExtDesc *aed;
1943         int adsize;
1944
1945         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1946                 adsize = sizeof(struct short_ad);
1947         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1948                 adsize = sizeof(struct long_ad);
1949         else
1950                 return -EIO;
1951
1952         if (!epos->bh) {
1953                 WARN_ON(iinfo->i_lenAlloc !=
1954                         epos->offset - udf_file_entry_alloc_offset(inode));
1955         } else {
1956                 aed = (struct allocExtDesc *)epos->bh->b_data;
1957                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
1958                         epos->offset - sizeof(struct allocExtDesc));
1959                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1960         }
1961
1962         udf_write_aext(inode, epos, eloc, elen, inc);
1963
1964         if (!epos->bh) {
1965                 iinfo->i_lenAlloc += adsize;
1966                 mark_inode_dirty(inode);
1967         } else {
1968                 aed = (struct allocExtDesc *)epos->bh->b_data;
1969                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1970                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1971                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1972                         udf_update_tag(epos->bh->b_data,
1973                                         epos->offset + (inc ? 0 : adsize));
1974                 else
1975                         udf_update_tag(epos->bh->b_data,
1976                                         sizeof(struct allocExtDesc));
1977                 mark_buffer_dirty_inode(epos->bh, inode);
1978         }
1979
1980         return 0;
1981 }
1982
1983 /*
1984  * Append extent at given position - should be the first free one in inode
1985  * / indirect extent. Takes care of allocating and linking indirect blocks.
1986  */
1987 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1988                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1989 {
1990         int adsize;
1991         struct super_block *sb = inode->i_sb;
1992
1993         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1994                 adsize = sizeof(struct short_ad);
1995         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1996                 adsize = sizeof(struct long_ad);
1997         else
1998                 return -EIO;
1999
2000         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2001                 int err;
2002                 int new_block;
2003
2004                 new_block = udf_new_block(sb, NULL,
2005                                           epos->block.partitionReferenceNum,
2006                                           epos->block.logicalBlockNum, &err);
2007                 if (!new_block)
2008                         return -ENOSPC;
2009
2010                 err = udf_setup_indirect_aext(inode, new_block, epos);
2011                 if (err)
2012                         return err;
2013         }
2014
2015         return __udf_add_aext(inode, epos, eloc, elen, inc);
2016 }
2017
2018 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2019                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2020 {
2021         int adsize;
2022         uint8_t *ptr;
2023         struct short_ad *sad;
2024         struct long_ad *lad;
2025         struct udf_inode_info *iinfo = UDF_I(inode);
2026
2027         if (!epos->bh)
2028                 ptr = iinfo->i_ext.i_data + epos->offset -
2029                         udf_file_entry_alloc_offset(inode) +
2030                         iinfo->i_lenEAttr;
2031         else
2032                 ptr = epos->bh->b_data + epos->offset;
2033
2034         switch (iinfo->i_alloc_type) {
2035         case ICBTAG_FLAG_AD_SHORT:
2036                 sad = (struct short_ad *)ptr;
2037                 sad->extLength = cpu_to_le32(elen);
2038                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2039                 adsize = sizeof(struct short_ad);
2040                 break;
2041         case ICBTAG_FLAG_AD_LONG:
2042                 lad = (struct long_ad *)ptr;
2043                 lad->extLength = cpu_to_le32(elen);
2044                 lad->extLocation = cpu_to_lelb(*eloc);
2045                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2046                 adsize = sizeof(struct long_ad);
2047                 break;
2048         default:
2049                 return;
2050         }
2051
2052         if (epos->bh) {
2053                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2054                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2055                         struct allocExtDesc *aed =
2056                                 (struct allocExtDesc *)epos->bh->b_data;
2057                         udf_update_tag(epos->bh->b_data,
2058                                        le32_to_cpu(aed->lengthAllocDescs) +
2059                                        sizeof(struct allocExtDesc));
2060                 }
2061                 mark_buffer_dirty_inode(epos->bh, inode);
2062         } else {
2063                 mark_inode_dirty(inode);
2064         }
2065
2066         if (inc)
2067                 epos->offset += adsize;
2068 }
2069
2070 /*
2071  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2072  * someone does some weird stuff.
2073  */
2074 #define UDF_MAX_INDIR_EXTS 16
2075
2076 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2077                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2078 {
2079         int8_t etype;
2080         unsigned int indirections = 0;
2081
2082         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2083                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2084                 int block;
2085
2086                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2087                         udf_err(inode->i_sb,
2088                                 "too many indirect extents in inode %lu\n",
2089                                 inode->i_ino);
2090                         return -1;
2091                 }
2092
2093                 epos->block = *eloc;
2094                 epos->offset = sizeof(struct allocExtDesc);
2095                 brelse(epos->bh);
2096                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2097                 epos->bh = udf_tread(inode->i_sb, block);
2098                 if (!epos->bh) {
2099                         udf_debug("reading block %d failed!\n", block);
2100                         return -1;
2101                 }
2102         }
2103
2104         return etype;
2105 }
2106
2107 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2108                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2109 {
2110         int alen;
2111         int8_t etype;
2112         uint8_t *ptr;
2113         struct short_ad *sad;
2114         struct long_ad *lad;
2115         struct udf_inode_info *iinfo = UDF_I(inode);
2116
2117         if (!epos->bh) {
2118                 if (!epos->offset)
2119                         epos->offset = udf_file_entry_alloc_offset(inode);
2120                 ptr = iinfo->i_ext.i_data + epos->offset -
2121                         udf_file_entry_alloc_offset(inode) +
2122                         iinfo->i_lenEAttr;
2123                 alen = udf_file_entry_alloc_offset(inode) +
2124                                                         iinfo->i_lenAlloc;
2125         } else {
2126                 if (!epos->offset)
2127                         epos->offset = sizeof(struct allocExtDesc);
2128                 ptr = epos->bh->b_data + epos->offset;
2129                 alen = sizeof(struct allocExtDesc) +
2130                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2131                                                         lengthAllocDescs);
2132         }
2133
2134         switch (iinfo->i_alloc_type) {
2135         case ICBTAG_FLAG_AD_SHORT:
2136                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2137                 if (!sad)
2138                         return -1;
2139                 etype = le32_to_cpu(sad->extLength) >> 30;
2140                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2141                 eloc->partitionReferenceNum =
2142                                 iinfo->i_location.partitionReferenceNum;
2143                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2144                 break;
2145         case ICBTAG_FLAG_AD_LONG:
2146                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2147                 if (!lad)
2148                         return -1;
2149                 etype = le32_to_cpu(lad->extLength) >> 30;
2150                 *eloc = lelb_to_cpu(lad->extLocation);
2151                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2152                 break;
2153         default:
2154                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2155                 return -1;
2156         }
2157
2158         return etype;
2159 }
2160
2161 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2162                               struct kernel_lb_addr neloc, uint32_t nelen)
2163 {
2164         struct kernel_lb_addr oeloc;
2165         uint32_t oelen;
2166         int8_t etype;
2167
2168         if (epos.bh)
2169                 get_bh(epos.bh);
2170
2171         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2172                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2173                 neloc = oeloc;
2174                 nelen = (etype << 30) | oelen;
2175         }
2176         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2177         brelse(epos.bh);
2178
2179         return (nelen >> 30);
2180 }
2181
2182 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2183                        struct kernel_lb_addr eloc, uint32_t elen)
2184 {
2185         struct extent_position oepos;
2186         int adsize;
2187         int8_t etype;
2188         struct allocExtDesc *aed;
2189         struct udf_inode_info *iinfo;
2190
2191         if (epos.bh) {
2192                 get_bh(epos.bh);
2193                 get_bh(epos.bh);
2194         }
2195
2196         iinfo = UDF_I(inode);
2197         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2198                 adsize = sizeof(struct short_ad);
2199         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2200                 adsize = sizeof(struct long_ad);
2201         else
2202                 adsize = 0;
2203
2204         oepos = epos;
2205         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2206                 return -1;
2207
2208         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2209                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2210                 if (oepos.bh != epos.bh) {
2211                         oepos.block = epos.block;
2212                         brelse(oepos.bh);
2213                         get_bh(epos.bh);
2214                         oepos.bh = epos.bh;
2215                         oepos.offset = epos.offset - adsize;
2216                 }
2217         }
2218         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2219         elen = 0;
2220
2221         if (epos.bh != oepos.bh) {
2222                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2223                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2224                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2225                 if (!oepos.bh) {
2226                         iinfo->i_lenAlloc -= (adsize * 2);
2227                         mark_inode_dirty(inode);
2228                 } else {
2229                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2230                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2231                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2232                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2233                                 udf_update_tag(oepos.bh->b_data,
2234                                                 oepos.offset - (2 * adsize));
2235                         else
2236                                 udf_update_tag(oepos.bh->b_data,
2237                                                 sizeof(struct allocExtDesc));
2238                         mark_buffer_dirty_inode(oepos.bh, inode);
2239                 }
2240         } else {
2241                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2242                 if (!oepos.bh) {
2243                         iinfo->i_lenAlloc -= adsize;
2244                         mark_inode_dirty(inode);
2245                 } else {
2246                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2247                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2248                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2249                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2250                                 udf_update_tag(oepos.bh->b_data,
2251                                                 epos.offset - adsize);
2252                         else
2253                                 udf_update_tag(oepos.bh->b_data,
2254                                                 sizeof(struct allocExtDesc));
2255                         mark_buffer_dirty_inode(oepos.bh, inode);
2256                 }
2257         }
2258
2259         brelse(epos.bh);
2260         brelse(oepos.bh);
2261
2262         return (elen >> 30);
2263 }
2264
2265 int8_t inode_bmap(struct inode *inode, sector_t block,
2266                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2267                   uint32_t *elen, sector_t *offset)
2268 {
2269         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2270         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2271         int8_t etype;
2272         struct udf_inode_info *iinfo;
2273
2274         iinfo = UDF_I(inode);
2275         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2276                 pos->offset = 0;
2277                 pos->block = iinfo->i_location;
2278                 pos->bh = NULL;
2279         }
2280         *elen = 0;
2281         do {
2282                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2283                 if (etype == -1) {
2284                         *offset = (bcount - lbcount) >> blocksize_bits;
2285                         iinfo->i_lenExtents = lbcount;
2286                         return -1;
2287                 }
2288                 lbcount += *elen;
2289         } while (lbcount <= bcount);
2290         /* update extent cache */
2291         udf_update_extent_cache(inode, lbcount - *elen, pos);
2292         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2293
2294         return etype;
2295 }
2296
2297 long udf_block_map(struct inode *inode, sector_t block)
2298 {
2299         struct kernel_lb_addr eloc;
2300         uint32_t elen;
2301         sector_t offset;
2302         struct extent_position epos = {};
2303         int ret;
2304
2305         down_read(&UDF_I(inode)->i_data_sem);
2306
2307         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2308                                                 (EXT_RECORDED_ALLOCATED >> 30))
2309                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2310         else
2311                 ret = 0;
2312
2313         up_read(&UDF_I(inode)->i_data_sem);
2314         brelse(epos.bh);
2315
2316         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2317                 return udf_fixed_to_variable(ret);
2318         else
2319                 return ret;
2320 }