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