fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 #define EXTENT_MERGE_SIZE 5
  47
  48 static umode_t udf_convert_permissions(struct fileEntry *);
  49 static int udf_update_inode(struct inode *, int);
  50 static int udf_sync_inode(struct inode *inode);
  51 static int udf_alloc_i_data(struct inode *inode, size_t size);
  52 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  53 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  54                               struct kernel_lb_addr, uint32_t);
  55 static void udf_split_extents(struct inode *, int *, int, int,
  56                               struct kernel_long_ad *, int *);
  57 static void udf_prealloc_extents(struct inode *, int, int,
  58                                  struct kernel_long_ad *, int *);
  59 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  60 static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  61                                int, struct extent_position *);
  62 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  63
  64 static void __udf_clear_extent_cache(struct inode *inode)
  65 {
  66         struct udf_inode_info *iinfo = UDF_I(inode);
  67
  68         if (iinfo->cached_extent.lstart != -1) {
  69                 brelse(iinfo->cached_extent.epos.bh);
  70                 iinfo->cached_extent.lstart = -1;
  71         }
  72 }
  73
  74 /* Invalidate extent cache */
  75 static void udf_clear_extent_cache(struct inode *inode)
  76 {
  77         struct udf_inode_info *iinfo = UDF_I(inode);
  78
  79         spin_lock(&iinfo->i_extent_cache_lock);
  80         __udf_clear_extent_cache(inode);
  81         spin_unlock(&iinfo->i_extent_cache_lock);
  82 }
  83
  84 /* Return contents of extent cache */
  85 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  86                                  loff_t *lbcount, struct extent_position *pos)
  87 {
  88         struct udf_inode_info *iinfo = UDF_I(inode);
  89         int ret = 0;
  90
  91         spin_lock(&iinfo->i_extent_cache_lock);
  92         if ((iinfo->cached_extent.lstart <= bcount) &&
  93             (iinfo->cached_extent.lstart != -1)) {
  94                 /* Cache hit */
  95                 *lbcount = iinfo->cached_extent.lstart;
  96                 memcpy(pos, &iinfo->cached_extent.epos,
  97                        sizeof(struct extent_position));
  98                 if (pos->bh)
  99                         get_bh(pos->bh);
 100                 ret = 1;
 101         }
 102         spin_unlock(&iinfo->i_extent_cache_lock);
 103         return ret;
 104 }
 105
 106 /* Add extent to extent cache */
 107 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 108                                     struct extent_position *pos)
 109 {
 110         struct udf_inode_info *iinfo = UDF_I(inode);
 111
 112         spin_lock(&iinfo->i_extent_cache_lock);
 113         /* Invalidate previously cached extent */
 114         __udf_clear_extent_cache(inode);
 115         if (pos->bh)
 116                 get_bh(pos->bh);
 117         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 118         iinfo->cached_extent.lstart = estart;
 119         switch (iinfo->i_alloc_type) {
 120         case ICBTAG_FLAG_AD_SHORT:
 121                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 122                 break;
 123         case ICBTAG_FLAG_AD_LONG:
 124                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 125                 break;
 126         }
 127         spin_unlock(&iinfo->i_extent_cache_lock);
 128 }
 129
 130 void udf_evict_inode(struct inode *inode)
 131 {
 132         struct udf_inode_info *iinfo = UDF_I(inode);
 133         int want_delete = 0;
 134
 135         if (!is_bad_inode(inode)) {
 136                 if (!inode->i_nlink) {
 137                         want_delete = 1;
 138                         udf_setsize(inode, 0);
 139                         udf_update_inode(inode, IS_SYNC(inode));
 140                 }
 141                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 142                     inode->i_size != iinfo->i_lenExtents) {
 143                         udf_warn(inode->i_sb,
 144                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 145                                  inode->i_ino, inode->i_mode,
 146                                  (unsigned long long)inode->i_size,
 147                                  (unsigned long long)iinfo->i_lenExtents);
 148                 }
 149         }
 150         truncate_inode_pages_final(&inode->i_data);
 151         invalidate_inode_buffers(inode);
 152         clear_inode(inode);
 153         kfree(iinfo->i_ext.i_data);
 154         iinfo->i_ext.i_data = NULL;
 155         udf_clear_extent_cache(inode);
 156         if (want_delete) {
 157                 udf_free_inode(inode);
 158         }
 159 }
 160
 161 static void udf_write_failed(struct address_space *mapping, loff_t to)
 162 {
 163         struct inode *inode = mapping->host;
 164         struct udf_inode_info *iinfo = UDF_I(inode);
 165         loff_t isize = inode->i_size;
 166
 167         if (to > isize) {
 168                 truncate_pagecache(inode, isize);
 169                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 170                         down_write(&iinfo->i_data_sem);
 171                         udf_clear_extent_cache(inode);
 172                         udf_truncate_extents(inode);
 173                         up_write(&iinfo->i_data_sem);
 174                 }
 175         }
 176 }
 177
 178 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 179 {
 180         return block_write_full_page(page, udf_get_block, wbc);
 181 }
 182
 183 static int udf_writepages(struct address_space *mapping,
 184                         struct writeback_control *wbc)
 185 {
 186         return mpage_writepages(mapping, wbc, udf_get_block);
 187 }
 188
 189 static int udf_readpage(struct file *file, struct page *page)
 190 {
 191         return mpage_readpage(page, udf_get_block);
 192 }
 193
 194 static int udf_readpages(struct file *file, struct address_space *mapping,
 195                         struct list_head *pages, unsigned nr_pages)
 196 {
 197         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 198 }
 199
 200 static int udf_write_begin(struct file *file, struct address_space *mapping,
 201                         loff_t pos, unsigned len, unsigned flags,
 202                         struct page **pagep, void **fsdata)
 203 {
 204         int ret;
 205
 206         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 207         if (unlikely(ret))
 208                 udf_write_failed(mapping, pos + len);
 209         return ret;
 210 }
 211
 212 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 213 {
 214         struct file *file = iocb->ki_filp;
 215         struct address_space *mapping = file->f_mapping;
 216         struct inode *inode = mapping->host;
 217         size_t count = iov_iter_count(iter);
 218         ssize_t ret;
 219
 220         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 221         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 222                 udf_write_failed(mapping, iocb->ki_pos + count);
 223         return ret;
 224 }
 225
 226 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 227 {
 228         return generic_block_bmap(mapping, block, udf_get_block);
 229 }
 230
 231 const struct address_space_operations udf_aops = {
 232         .readpage       = udf_readpage,
 233         .readpages      = udf_readpages,
 234         .writepage      = udf_writepage,
 235         .writepages     = udf_writepages,
 236         .write_begin    = udf_write_begin,
 237         .write_end      = generic_write_end,
 238         .direct_IO      = udf_direct_IO,
 239         .bmap           = udf_bmap,
 240 };
 241
 242 /*
 243  * Expand file stored in ICB to a normal one-block-file
 244  *
 245  * This function requires i_data_sem for writing and releases it.
 246  * This function requires i_mutex held
 247  */
 248 int udf_expand_file_adinicb(struct inode *inode)
 249 {
 250         struct page *page;
 251         char *kaddr;
 252         struct udf_inode_info *iinfo = UDF_I(inode);
 253         int err;
 254
 255         WARN_ON_ONCE(!inode_is_locked(inode));
 256         if (!iinfo->i_lenAlloc) {
 257                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 258                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 259                 else
 260                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 261                 /* from now on we have normal address_space methods */
 262                 inode->i_data.a_ops = &udf_aops;
 263                 up_write(&iinfo->i_data_sem);
 264                 mark_inode_dirty(inode);
 265                 return 0;
 266         }
 267         /*
 268          * Release i_data_sem so that we can lock a page - page lock ranks
 269          * above i_data_sem. i_mutex still protects us against file changes.
 270          */
 271         up_write(&iinfo->i_data_sem);
 272
 273         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 274         if (!page)
 275                 return -ENOMEM;
 276
 277         if (!PageUptodate(page)) {
 278                 kaddr = kmap_atomic(page);
 279                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 280                        PAGE_SIZE - iinfo->i_lenAlloc);
 281                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 282                         iinfo->i_lenAlloc);
 283                 flush_dcache_page(page);
 284                 SetPageUptodate(page);
 285                 kunmap_atomic(kaddr);
 286         }
 287         down_write(&iinfo->i_data_sem);
 288         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 289                iinfo->i_lenAlloc);
 290         iinfo->i_lenAlloc = 0;
 291         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 292                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 293         else
 294                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 295         /* from now on we have normal address_space methods */
 296         inode->i_data.a_ops = &udf_aops;
 297         set_page_dirty(page);
 298         unlock_page(page);
 299         up_write(&iinfo->i_data_sem);
 300         err = filemap_fdatawrite(inode->i_mapping);
 301         if (err) {
 302                 /* Restore everything back so that we don't lose data... */
 303                 lock_page(page);
 304                 down_write(&iinfo->i_data_sem);
 305                 kaddr = kmap_atomic(page);
 306                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 307                        inode->i_size);
 308                 kunmap_atomic(kaddr);
 309                 unlock_page(page);
 310                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 311                 inode->i_data.a_ops = &udf_adinicb_aops;
 312                 iinfo->i_lenAlloc = inode->i_size;
 313                 up_write(&iinfo->i_data_sem);
 314         }
 315         put_page(page);
 316         mark_inode_dirty(inode);
 317
 318         return err;
 319 }
 320
 321 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 322                                            int *err)
 323 {
 324         int newblock;
 325         struct buffer_head *dbh = NULL;
 326         struct kernel_lb_addr eloc;
 327         uint8_t alloctype;
 328         struct extent_position epos;
 329
 330         struct udf_fileident_bh sfibh, dfibh;
 331         loff_t f_pos = udf_ext0_offset(inode);
 332         int size = udf_ext0_offset(inode) + inode->i_size;
 333         struct fileIdentDesc cfi, *sfi, *dfi;
 334         struct udf_inode_info *iinfo = UDF_I(inode);
 335
 336         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 337                 alloctype = ICBTAG_FLAG_AD_SHORT;
 338         else
 339                 alloctype = ICBTAG_FLAG_AD_LONG;
 340
 341         if (!inode->i_size) {
 342                 iinfo->i_alloc_type = alloctype;
 343                 mark_inode_dirty(inode);
 344                 return NULL;
 345         }
 346
 347         /* alloc block, and copy data to it */
 348         *block = udf_new_block(inode->i_sb, inode,
 349                                iinfo->i_location.partitionReferenceNum,
 350                                iinfo->i_location.logicalBlockNum, err);
 351         if (!(*block))
 352                 return NULL;
 353         newblock = udf_get_pblock(inode->i_sb, *block,
 354                                   iinfo->i_location.partitionReferenceNum,
 355                                 0);
 356         if (!newblock)
 357                 return NULL;
 358         dbh = udf_tgetblk(inode->i_sb, newblock);
 359         if (!dbh)
 360                 return NULL;
 361         lock_buffer(dbh);
 362         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 363         set_buffer_uptodate(dbh);
 364         unlock_buffer(dbh);
 365         mark_buffer_dirty_inode(dbh, inode);
 366
 367         sfibh.soffset = sfibh.eoffset =
 368                         f_pos & (inode->i_sb->s_blocksize - 1);
 369         sfibh.sbh = sfibh.ebh = NULL;
 370         dfibh.soffset = dfibh.eoffset = 0;
 371         dfibh.sbh = dfibh.ebh = dbh;
 372         while (f_pos < size) {
 373                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 374                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 375                                          NULL, NULL, NULL);
 376                 if (!sfi) {
 377                         brelse(dbh);
 378                         return NULL;
 379                 }
 380                 iinfo->i_alloc_type = alloctype;
 381                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 382                 dfibh.soffset = dfibh.eoffset;
 383                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 384                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 385                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 386                                  sfi->fileIdent +
 387                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 388                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 389                         brelse(dbh);
 390                         return NULL;
 391                 }
 392         }
 393         mark_buffer_dirty_inode(dbh, inode);
 394
 395         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 396                 iinfo->i_lenAlloc);
 397         iinfo->i_lenAlloc = 0;
 398         eloc.logicalBlockNum = *block;
 399         eloc.partitionReferenceNum =
 400                                 iinfo->i_location.partitionReferenceNum;
 401         iinfo->i_lenExtents = inode->i_size;
 402         epos.bh = NULL;
 403         epos.block = iinfo->i_location;
 404         epos.offset = udf_file_entry_alloc_offset(inode);
 405         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 406         /* UniqueID stuff */
 407
 408         brelse(epos.bh);
 409         mark_inode_dirty(inode);
 410         return dbh;
 411 }
 412
 413 static int udf_get_block(struct inode *inode, sector_t block,
 414                          struct buffer_head *bh_result, int create)
 415 {
 416         int err, new;
 417         sector_t phys = 0;
 418         struct udf_inode_info *iinfo;
 419
 420         if (!create) {
 421                 phys = udf_block_map(inode, block);
 422                 if (phys)
 423                         map_bh(bh_result, inode->i_sb, phys);
 424                 return 0;
 425         }
 426
 427         err = -EIO;
 428         new = 0;
 429         iinfo = UDF_I(inode);
 430
 431         down_write(&iinfo->i_data_sem);
 432         if (block == iinfo->i_next_alloc_block + 1) {
 433                 iinfo->i_next_alloc_block++;
 434                 iinfo->i_next_alloc_goal++;
 435         }
 436
 437         udf_clear_extent_cache(inode);
 438         phys = inode_getblk(inode, block, &err, &new);
 439         if (!phys)
 440                 goto abort;
 441
 442         if (new)
 443                 set_buffer_new(bh_result);
 444         map_bh(bh_result, inode->i_sb, phys);
 445
 446 abort:
 447         up_write(&iinfo->i_data_sem);
 448         return err;
 449 }
 450
 451 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 452                                       int create, int *err)
 453 {
 454         struct buffer_head *bh;
 455         struct buffer_head dummy;
 456
 457         dummy.b_state = 0;
 458         dummy.b_blocknr = -1000;
 459         *err = udf_get_block(inode, block, &dummy, create);
 460         if (!*err && buffer_mapped(&dummy)) {
 461                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 462                 if (buffer_new(&dummy)) {
 463                         lock_buffer(bh);
 464                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 465                         set_buffer_uptodate(bh);
 466                         unlock_buffer(bh);
 467                         mark_buffer_dirty_inode(bh, inode);
 468                 }
 469                 return bh;
 470         }
 471
 472         return NULL;
 473 }
 474
 475 /* Extend the file with new blocks totaling 'new_block_bytes',
 476  * return the number of extents added
 477  */
 478 static int udf_do_extend_file(struct inode *inode,
 479                               struct extent_position *last_pos,
 480                               struct kernel_long_ad *last_ext,
 481                               loff_t new_block_bytes)
 482 {
 483         uint32_t add;
 484         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 485         struct super_block *sb = inode->i_sb;
 486         struct kernel_lb_addr prealloc_loc = {};
 487         int prealloc_len = 0;
 488         struct udf_inode_info *iinfo;
 489         int err;
 490
 491         /* The previous extent is fake and we should not extend by anything
 492          * - there's nothing to do... */
 493         if (!new_block_bytes && fake)
 494                 return 0;
 495
 496         iinfo = UDF_I(inode);
 497         /* Round the last extent up to a multiple of block size */
 498         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 499                 last_ext->extLength =
 500                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 501                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 502                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 503                 iinfo->i_lenExtents =
 504                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 505                         ~(sb->s_blocksize - 1);
 506         }
 507
 508         /* Last extent are just preallocated blocks? */
 509         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 510                                                 EXT_NOT_RECORDED_ALLOCATED) {
 511                 /* Save the extent so that we can reattach it to the end */
 512                 prealloc_loc = last_ext->extLocation;
 513                 prealloc_len = last_ext->extLength;
 514                 /* Mark the extent as a hole */
 515                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 516                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 517                 last_ext->extLocation.logicalBlockNum = 0;
 518                 last_ext->extLocation.partitionReferenceNum = 0;
 519         }
 520
 521         /* Can we merge with the previous extent? */
 522         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 523                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 524                 add = (1 << 30) - sb->s_blocksize -
 525                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 526                 if (add > new_block_bytes)
 527                         add = new_block_bytes;
 528                 new_block_bytes -= add;
 529                 last_ext->extLength += add;
 530         }
 531
 532         if (fake) {
 533                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 534                              last_ext->extLength, 1);
 535                 count++;
 536         } else {
 537                 struct kernel_lb_addr tmploc;
 538                 uint32_t tmplen;
 539
 540                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 541                                 last_ext->extLength, 1);
 542
 543                 /*
 544                  * We've rewritten the last extent. If we are going to add
 545                  * more extents, we may need to enter possible following
 546                  * empty indirect extent.
 547                  */
 548                 if (new_block_bytes || prealloc_len)
 549                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 550         }
 551
 552         /* Managed to do everything necessary? */
 553         if (!new_block_bytes)
 554                 goto out;
 555
 556         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 557         last_ext->extLocation.logicalBlockNum = 0;
 558         last_ext->extLocation.partitionReferenceNum = 0;
 559         add = (1 << 30) - sb->s_blocksize;
 560         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 561
 562         /* Create enough extents to cover the whole hole */
 563         while (new_block_bytes > add) {
 564                 new_block_bytes -= add;
 565                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 566                                    last_ext->extLength, 1);
 567                 if (err)
 568                         return err;
 569                 count++;
 570         }
 571         if (new_block_bytes) {
 572                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 573                         new_block_bytes;
 574                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 575                                    last_ext->extLength, 1);
 576                 if (err)
 577                         return err;
 578                 count++;
 579         }
 580
 581 out:
 582         /* Do we have some preallocated blocks saved? */
 583         if (prealloc_len) {
 584                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 585                                    prealloc_len, 1);
 586                 if (err)
 587                         return err;
 588                 last_ext->extLocation = prealloc_loc;
 589                 last_ext->extLength = prealloc_len;
 590                 count++;
 591         }
 592
 593         /* last_pos should point to the last written extent... */
 594         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 595                 last_pos->offset -= sizeof(struct short_ad);
 596         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 597                 last_pos->offset -= sizeof(struct long_ad);
 598         else
 599                 return -EIO;
 600
 601         return count;
 602 }
 603
 604 /* Extend the final block of the file to final_block_len bytes */
 605 static void udf_do_extend_final_block(struct inode *inode,
 606                                       struct extent_position *last_pos,
 607                                       struct kernel_long_ad *last_ext,
 608                                       uint32_t final_block_len)
 609 {
 610         struct super_block *sb = inode->i_sb;
 611         uint32_t added_bytes;
 612
 613         added_bytes = final_block_len -
 614                       (last_ext->extLength & (sb->s_blocksize - 1));
 615         last_ext->extLength += added_bytes;
 616         UDF_I(inode)->i_lenExtents += added_bytes;
 617
 618         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 619                         last_ext->extLength, 1);
 620 }
 621
 622 static int udf_extend_file(struct inode *inode, loff_t newsize)
 623 {
 624
 625         struct extent_position epos;
 626         struct kernel_lb_addr eloc;
 627         uint32_t elen;
 628         int8_t etype;
 629         struct super_block *sb = inode->i_sb;
 630         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 631         unsigned long partial_final_block;
 632         int adsize;
 633         struct udf_inode_info *iinfo = UDF_I(inode);
 634         struct kernel_long_ad extent;
 635         int err = 0;
 636         int within_final_block;
 637
 638         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 639                 adsize = sizeof(struct short_ad);
 640         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 641                 adsize = sizeof(struct long_ad);
 642         else
 643                 BUG();
 644
 645         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 646         within_final_block = (etype != -1);
 647
 648         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 649             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 650                 /* File has no extents at all or has empty last
 651                  * indirect extent! Create a fake extent... */
 652                 extent.extLocation.logicalBlockNum = 0;
 653                 extent.extLocation.partitionReferenceNum = 0;
 654                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 655         } else {
 656                 epos.offset -= adsize;
 657                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 658                                       &extent.extLength, 0);
 659                 extent.extLength |= etype << 30;
 660         }
 661
 662         partial_final_block = newsize & (sb->s_blocksize - 1);
 663
 664         /* File has extent covering the new size (could happen when extending
 665          * inside a block)?
 666          */
 667         if (within_final_block) {
 668                 /* Extending file within the last file block */
 669                 udf_do_extend_final_block(inode, &epos, &extent,
 670                                           partial_final_block);
 671         } else {
 672                 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
 673                              partial_final_block;
 674                 err = udf_do_extend_file(inode, &epos, &extent, add);
 675         }
 676
 677         if (err < 0)
 678                 goto out;
 679         err = 0;
 680         iinfo->i_lenExtents = newsize;
 681 out:
 682         brelse(epos.bh);
 683         return err;
 684 }
 685
 686 static sector_t inode_getblk(struct inode *inode, sector_t block,
 687                              int *err, int *new)
 688 {
 689         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 690         struct extent_position prev_epos, cur_epos, next_epos;
 691         int count = 0, startnum = 0, endnum = 0;
 692         uint32_t elen = 0, tmpelen;
 693         struct kernel_lb_addr eloc, tmpeloc;
 694         int c = 1;
 695         loff_t lbcount = 0, b_off = 0;
 696         uint32_t newblocknum, newblock;
 697         sector_t offset = 0;
 698         int8_t etype;
 699         struct udf_inode_info *iinfo = UDF_I(inode);
 700         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 701         int lastblock = 0;
 702         bool isBeyondEOF;
 703
 704         *err = 0;
 705         *new = 0;
 706         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 707         prev_epos.block = iinfo->i_location;
 708         prev_epos.bh = NULL;
 709         cur_epos = next_epos = prev_epos;
 710         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 711
 712         /* find the extent which contains the block we are looking for.
 713            alternate between laarr[0] and laarr[1] for locations of the
 714            current extent, and the previous extent */
 715         do {
 716                 if (prev_epos.bh != cur_epos.bh) {
 717                         brelse(prev_epos.bh);
 718                         get_bh(cur_epos.bh);
 719                         prev_epos.bh = cur_epos.bh;
 720                 }
 721                 if (cur_epos.bh != next_epos.bh) {
 722                         brelse(cur_epos.bh);
 723                         get_bh(next_epos.bh);
 724                         cur_epos.bh = next_epos.bh;
 725                 }
 726
 727                 lbcount += elen;
 728
 729                 prev_epos.block = cur_epos.block;
 730                 cur_epos.block = next_epos.block;
 731
 732                 prev_epos.offset = cur_epos.offset;
 733                 cur_epos.offset = next_epos.offset;
 734
 735                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 736                 if (etype == -1)
 737                         break;
 738
 739                 c = !c;
 740
 741                 laarr[c].extLength = (etype << 30) | elen;
 742                 laarr[c].extLocation = eloc;
 743
 744                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 745                         pgoal = eloc.logicalBlockNum +
 746                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 747                                  inode->i_sb->s_blocksize_bits);
 748
 749                 count++;
 750         } while (lbcount + elen <= b_off);
 751
 752         b_off -= lbcount;
 753         offset = b_off >> inode->i_sb->s_blocksize_bits;
 754         /*
 755          * Move prev_epos and cur_epos into indirect extent if we are at
 756          * the pointer to it
 757          */
 758         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 759         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 760
 761         /* if the extent is allocated and recorded, return the block
 762            if the extent is not a multiple of the blocksize, round up */
 763
 764         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 765                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 766                         elen = EXT_RECORDED_ALLOCATED |
 767                                 ((elen + inode->i_sb->s_blocksize - 1) &
 768                                  ~(inode->i_sb->s_blocksize - 1));
 769                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 770                 }
 771                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 772                 goto out_free;
 773         }
 774
 775         /* Are we beyond EOF? */
 776         if (etype == -1) {
 777                 int ret;
 778                 loff_t hole_len;
 779                 isBeyondEOF = true;
 780                 if (count) {
 781                         if (c)
 782                                 laarr[0] = laarr[1];
 783                         startnum = 1;
 784                 } else {
 785                         /* Create a fake extent when there's not one */
 786                         memset(&laarr[0].extLocation, 0x00,
 787                                 sizeof(struct kernel_lb_addr));
 788                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 789                         /* Will udf_do_extend_file() create real extent from
 790                            a fake one? */
 791                         startnum = (offset > 0);
 792                 }
 793                 /* Create extents for the hole between EOF and offset */
 794                 hole_len = (loff_t)offset << inode->i_blkbits;
 795                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 796                 if (ret < 0) {
 797                         *err = ret;
 798                         newblock = 0;
 799                         goto out_free;
 800                 }
 801                 c = 0;
 802                 offset = 0;
 803                 count += ret;
 804                 /* We are not covered by a preallocated extent? */
 805                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 806                                                 EXT_NOT_RECORDED_ALLOCATED) {
 807                         /* Is there any real extent? - otherwise we overwrite
 808                          * the fake one... */
 809                         if (count)
 810                                 c = !c;
 811                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 812                                 inode->i_sb->s_blocksize;
 813                         memset(&laarr[c].extLocation, 0x00,
 814                                 sizeof(struct kernel_lb_addr));
 815                         count++;
 816                 }
 817                 endnum = c + 1;
 818                 lastblock = 1;
 819         } else {
 820                 isBeyondEOF = false;
 821                 endnum = startnum = ((count > 2) ? 2 : count);
 822
 823                 /* if the current extent is in position 0,
 824                    swap it with the previous */
 825                 if (!c && count != 1) {
 826                         laarr[2] = laarr[0];
 827                         laarr[0] = laarr[1];
 828                         laarr[1] = laarr[2];
 829                         c = 1;
 830                 }
 831
 832                 /* if the current block is located in an extent,
 833                    read the next extent */
 834                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 835                 if (etype != -1) {
 836                         laarr[c + 1].extLength = (etype << 30) | elen;
 837                         laarr[c + 1].extLocation = eloc;
 838                         count++;
 839                         startnum++;
 840                         endnum++;
 841                 } else
 842                         lastblock = 1;
 843         }
 844
 845         /* if the current extent is not recorded but allocated, get the
 846          * block in the extent corresponding to the requested block */
 847         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 848                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 849         else { /* otherwise, allocate a new block */
 850                 if (iinfo->i_next_alloc_block == block)
 851                         goal = iinfo->i_next_alloc_goal;
 852
 853                 if (!goal) {
 854                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 855                                 goal = iinfo->i_location.logicalBlockNum + 1;
 856                 }
 857
 858                 newblocknum = udf_new_block(inode->i_sb, inode,
 859                                 iinfo->i_location.partitionReferenceNum,
 860                                 goal, err);
 861                 if (!newblocknum) {
 862                         *err = -ENOSPC;
 863                         newblock = 0;
 864                         goto out_free;
 865                 }
 866                 if (isBeyondEOF)
 867                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 868         }
 869
 870         /* if the extent the requsted block is located in contains multiple
 871          * blocks, split the extent into at most three extents. blocks prior
 872          * to requested block, requested block, and blocks after requested
 873          * block */
 874         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 875
 876         /* We preallocate blocks only for regular files. It also makes sense
 877          * for directories but there's a problem when to drop the
 878          * preallocation. We might use some delayed work for that but I feel
 879          * it's overengineering for a filesystem like UDF. */
 880         if (S_ISREG(inode->i_mode))
 881                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 882
 883         /* merge any continuous blocks in laarr */
 884         udf_merge_extents(inode, laarr, &endnum);
 885
 886         /* write back the new extents, inserting new extents if the new number
 887          * of extents is greater than the old number, and deleting extents if
 888          * the new number of extents is less than the old number */
 889         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 890
 891         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 892                                 iinfo->i_location.partitionReferenceNum, 0);
 893         if (!newblock) {
 894                 *err = -EIO;
 895                 goto out_free;
 896         }
 897         *new = 1;
 898         iinfo->i_next_alloc_block = block;
 899         iinfo->i_next_alloc_goal = newblocknum;
 900         inode->i_ctime = current_time(inode);
 901
 902         if (IS_SYNC(inode))
 903                 udf_sync_inode(inode);
 904         else
 905                 mark_inode_dirty(inode);
 906 out_free:
 907         brelse(prev_epos.bh);
 908         brelse(cur_epos.bh);
 909         brelse(next_epos.bh);
 910         return newblock;
 911 }
 912
 913 static void udf_split_extents(struct inode *inode, int *c, int offset,
 914                               int newblocknum, struct kernel_long_ad *laarr,
 915                               int *endnum)
 916 {
 917         unsigned long blocksize = inode->i_sb->s_blocksize;
 918         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 919
 920         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 921             (laarr[*c].extLength >> 30) ==
 922                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 923                 int curr = *c;
 924                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 925                             blocksize - 1) >> blocksize_bits;
 926                 int8_t etype = (laarr[curr].extLength >> 30);
 927
 928                 if (blen == 1)
 929                         ;
 930                 else if (!offset || blen == offset + 1) {
 931                         laarr[curr + 2] = laarr[curr + 1];
 932                         laarr[curr + 1] = laarr[curr];
 933                 } else {
 934                         laarr[curr + 3] = laarr[curr + 1];
 935                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 936                 }
 937
 938                 if (offset) {
 939                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 940                                 udf_free_blocks(inode->i_sb, inode,
 941                                                 &laarr[curr].extLocation,
 942                                                 0, offset);
 943                                 laarr[curr].extLength =
 944                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 945                                         (offset << blocksize_bits);
 946                                 laarr[curr].extLocation.logicalBlockNum = 0;
 947                                 laarr[curr].extLocation.
 948                                                 partitionReferenceNum = 0;
 949                         } else
 950                                 laarr[curr].extLength = (etype << 30) |
 951                                         (offset << blocksize_bits);
 952                         curr++;
 953                         (*c)++;
 954                         (*endnum)++;
 955                 }
 956
 957                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 958                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 959                         laarr[curr].extLocation.partitionReferenceNum =
 960                                 UDF_I(inode)->i_location.partitionReferenceNum;
 961                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 962                         blocksize;
 963                 curr++;
 964
 965                 if (blen != offset + 1) {
 966                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 967                                 laarr[curr].extLocation.logicalBlockNum +=
 968                                                                 offset + 1;
 969                         laarr[curr].extLength = (etype << 30) |
 970                                 ((blen - (offset + 1)) << blocksize_bits);
 971                         curr++;
 972                         (*endnum)++;
 973                 }
 974         }
 975 }
 976
 977 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 978                                  struct kernel_long_ad *laarr,
 979                                  int *endnum)
 980 {
 981         int start, length = 0, currlength = 0, i;
 982
 983         if (*endnum >= (c + 1)) {
 984                 if (!lastblock)
 985                         return;
 986                 else
 987                         start = c;
 988         } else {
 989                 if ((laarr[c + 1].extLength >> 30) ==
 990                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 991                         start = c + 1;
 992                         length = currlength =
 993                                 (((laarr[c + 1].extLength &
 994                                         UDF_EXTENT_LENGTH_MASK) +
 995                                 inode->i_sb->s_blocksize - 1) >>
 996                                 inode->i_sb->s_blocksize_bits);
 997                 } else
 998                         start = c;
 999         }
1000
1001         for (i = start + 1; i <= *endnum; i++) {
1002                 if (i == *endnum) {
1003                         if (lastblock)
1004                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1005                 } else if ((laarr[i].extLength >> 30) ==
1006                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1007                         length += (((laarr[i].extLength &
1008                                                 UDF_EXTENT_LENGTH_MASK) +
1009                                     inode->i_sb->s_blocksize - 1) >>
1010                                     inode->i_sb->s_blocksize_bits);
1011                 } else
1012                         break;
1013         }
1014
1015         if (length) {
1016                 int next = laarr[start].extLocation.logicalBlockNum +
1017                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1018                           inode->i_sb->s_blocksize - 1) >>
1019                           inode->i_sb->s_blocksize_bits);
1020                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1021                                 laarr[start].extLocation.partitionReferenceNum,
1022                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1023                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1024                                 currlength);
1025                 if (numalloc)   {
1026                         if (start == (c + 1))
1027                                 laarr[start].extLength +=
1028                                         (numalloc <<
1029                                          inode->i_sb->s_blocksize_bits);
1030                         else {
1031                                 memmove(&laarr[c + 2], &laarr[c + 1],
1032                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1033                                 (*endnum)++;
1034                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1035                                 laarr[c + 1].extLocation.partitionReferenceNum =
1036                                         laarr[c].extLocation.
1037                                                         partitionReferenceNum;
1038                                 laarr[c + 1].extLength =
1039                                         EXT_NOT_RECORDED_ALLOCATED |
1040                                         (numalloc <<
1041                                          inode->i_sb->s_blocksize_bits);
1042                                 start = c + 1;
1043                         }
1044
1045                         for (i = start + 1; numalloc && i < *endnum; i++) {
1046                                 int elen = ((laarr[i].extLength &
1047                                                 UDF_EXTENT_LENGTH_MASK) +
1048                                             inode->i_sb->s_blocksize - 1) >>
1049                                             inode->i_sb->s_blocksize_bits;
1050
1051                                 if (elen > numalloc) {
1052                                         laarr[i].extLength -=
1053                                                 (numalloc <<
1054                                                  inode->i_sb->s_blocksize_bits);
1055                                         numalloc = 0;
1056                                 } else {
1057                                         numalloc -= elen;
1058                                         if (*endnum > (i + 1))
1059                                                 memmove(&laarr[i],
1060                                                         &laarr[i + 1],
1061                                                         sizeof(struct long_ad) *
1062                                                         (*endnum - (i + 1)));
1063                                         i--;
1064                                         (*endnum)--;
1065                                 }
1066                         }
1067                         UDF_I(inode)->i_lenExtents +=
1068                                 numalloc << inode->i_sb->s_blocksize_bits;
1069                 }
1070         }
1071 }
1072
1073 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1074                               int *endnum)
1075 {
1076         int i;
1077         unsigned long blocksize = inode->i_sb->s_blocksize;
1078         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1079
1080         for (i = 0; i < (*endnum - 1); i++) {
1081                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1082                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1083
1084                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1085                         (((li->extLength >> 30) ==
1086                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1087                         ((lip1->extLocation.logicalBlockNum -
1088                           li->extLocation.logicalBlockNum) ==
1089                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1090                         blocksize - 1) >> blocksize_bits)))) {
1091
1092                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1093                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1094                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1095                                 lip1->extLength = (lip1->extLength -
1096                                                   (li->extLength &
1097                                                    UDF_EXTENT_LENGTH_MASK) +
1098                                                    UDF_EXTENT_LENGTH_MASK) &
1099                                                         ~(blocksize - 1);
1100                                 li->extLength = (li->extLength &
1101                                                  UDF_EXTENT_FLAG_MASK) +
1102                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1103                                                 blocksize;
1104                                 lip1->extLocation.logicalBlockNum =
1105                                         li->extLocation.logicalBlockNum +
1106                                         ((li->extLength &
1107                                                 UDF_EXTENT_LENGTH_MASK) >>
1108                                                 blocksize_bits);
1109                         } else {
1110                                 li->extLength = lip1->extLength +
1111                                         (((li->extLength &
1112                                                 UDF_EXTENT_LENGTH_MASK) +
1113                                          blocksize - 1) & ~(blocksize - 1));
1114                                 if (*endnum > (i + 2))
1115                                         memmove(&laarr[i + 1], &laarr[i + 2],
1116                                                 sizeof(struct long_ad) *
1117                                                 (*endnum - (i + 2)));
1118                                 i--;
1119                                 (*endnum)--;
1120                         }
1121                 } else if (((li->extLength >> 30) ==
1122                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1123                            ((lip1->extLength >> 30) ==
1124                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1125                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1126                                         ((li->extLength &
1127                                           UDF_EXTENT_LENGTH_MASK) +
1128                                          blocksize - 1) >> blocksize_bits);
1129                         li->extLocation.logicalBlockNum = 0;
1130                         li->extLocation.partitionReferenceNum = 0;
1131
1132                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1133                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1134                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1135                                 lip1->extLength = (lip1->extLength -
1136                                                    (li->extLength &
1137                                                    UDF_EXTENT_LENGTH_MASK) +
1138                                                    UDF_EXTENT_LENGTH_MASK) &
1139                                                    ~(blocksize - 1);
1140                                 li->extLength = (li->extLength &
1141                                                  UDF_EXTENT_FLAG_MASK) +
1142                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1143                                                 blocksize;
1144                         } else {
1145                                 li->extLength = lip1->extLength +
1146                                         (((li->extLength &
1147                                                 UDF_EXTENT_LENGTH_MASK) +
1148                                           blocksize - 1) & ~(blocksize - 1));
1149                                 if (*endnum > (i + 2))
1150                                         memmove(&laarr[i + 1], &laarr[i + 2],
1151                                                 sizeof(struct long_ad) *
1152                                                 (*endnum - (i + 2)));
1153                                 i--;
1154                                 (*endnum)--;
1155                         }
1156                 } else if ((li->extLength >> 30) ==
1157                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1158                         udf_free_blocks(inode->i_sb, inode,
1159                                         &li->extLocation, 0,
1160                                         ((li->extLength &
1161                                                 UDF_EXTENT_LENGTH_MASK) +
1162                                          blocksize - 1) >> blocksize_bits);
1163                         li->extLocation.logicalBlockNum = 0;
1164                         li->extLocation.partitionReferenceNum = 0;
1165                         li->extLength = (li->extLength &
1166                                                 UDF_EXTENT_LENGTH_MASK) |
1167                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1168                 }
1169         }
1170 }
1171
1172 static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1173                                int startnum, int endnum,
1174                                struct extent_position *epos)
1175 {
1176         int start = 0, i;
1177         struct kernel_lb_addr tmploc;
1178         uint32_t tmplen;
1179
1180         if (startnum > endnum) {
1181                 for (i = 0; i < (startnum - endnum); i++)
1182                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1183                                         laarr[i].extLength);
1184         } else if (startnum < endnum) {
1185                 for (i = 0; i < (endnum - startnum); i++) {
1186                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1187                                         laarr[i].extLength);
1188                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1189                                       &laarr[i].extLength, 1);
1190                         start++;
1191                 }
1192         }
1193
1194         for (i = start; i < endnum; i++) {
1195                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1196                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1197                                laarr[i].extLength, 1);
1198         }
1199 }
1200
1201 struct buffer_head *udf_bread(struct inode *inode, int block,
1202                               int create, int *err)
1203 {
1204         struct buffer_head *bh = NULL;
1205
1206         bh = udf_getblk(inode, block, create, err);
1207         if (!bh)
1208                 return NULL;
1209
1210         if (buffer_uptodate(bh))
1211                 return bh;
1212
1213         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1214
1215         wait_on_buffer(bh);
1216         if (buffer_uptodate(bh))
1217                 return bh;
1218
1219         brelse(bh);
1220         *err = -EIO;
1221         return NULL;
1222 }
1223
1224 int udf_setsize(struct inode *inode, loff_t newsize)
1225 {
1226         int err;
1227         struct udf_inode_info *iinfo;
1228         int bsize = i_blocksize(inode);
1229
1230         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1231               S_ISLNK(inode->i_mode)))
1232                 return -EINVAL;
1233         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1234                 return -EPERM;
1235
1236         iinfo = UDF_I(inode);
1237         if (newsize > inode->i_size) {
1238                 down_write(&iinfo->i_data_sem);
1239                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1240                         if (bsize <
1241                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1242                                 err = udf_expand_file_adinicb(inode);
1243                                 if (err)
1244                                         return err;
1245                                 down_write(&iinfo->i_data_sem);
1246                         } else {
1247                                 iinfo->i_lenAlloc = newsize;
1248                                 goto set_size;
1249                         }
1250                 }
1251                 err = udf_extend_file(inode, newsize);
1252                 if (err) {
1253                         up_write(&iinfo->i_data_sem);
1254                         return err;
1255                 }
1256 set_size:
1257                 up_write(&iinfo->i_data_sem);
1258                 truncate_setsize(inode, newsize);
1259         } else {
1260                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1261                         down_write(&iinfo->i_data_sem);
1262                         udf_clear_extent_cache(inode);
1263                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1264                                0x00, bsize - newsize -
1265                                udf_file_entry_alloc_offset(inode));
1266                         iinfo->i_lenAlloc = newsize;
1267                         truncate_setsize(inode, newsize);
1268                         up_write(&iinfo->i_data_sem);
1269                         goto update_time;
1270                 }
1271                 err = block_truncate_page(inode->i_mapping, newsize,
1272                                           udf_get_block);
1273                 if (err)
1274                         return err;
1275                 truncate_setsize(inode, newsize);
1276                 down_write(&iinfo->i_data_sem);
1277                 udf_clear_extent_cache(inode);
1278                 udf_truncate_extents(inode);
1279                 up_write(&iinfo->i_data_sem);
1280         }
1281 update_time:
1282         inode->i_mtime = inode->i_ctime = current_time(inode);
1283         if (IS_SYNC(inode))
1284                 udf_sync_inode(inode);
1285         else
1286                 mark_inode_dirty(inode);
1287         return 0;
1288 }
1289
1290 /*
1291  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1292  * arbitrary - just that we hopefully don't limit any real use of rewritten
1293  * inode on write-once media but avoid looping for too long on corrupted media.
1294  */
1295 #define UDF_MAX_ICB_NESTING 1024
1296
1297 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1298 {
1299         struct buffer_head *bh = NULL;
1300         struct fileEntry *fe;
1301         struct extendedFileEntry *efe;
1302         uint16_t ident;
1303         struct udf_inode_info *iinfo = UDF_I(inode);
1304         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1305         struct kernel_lb_addr *iloc = &iinfo->i_location;
1306         unsigned int link_count;
1307         unsigned int indirections = 0;
1308         int bs = inode->i_sb->s_blocksize;
1309         int ret = -EIO;
1310
1311 reread:
1312         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1313                 udf_debug("partition reference: %d > logical volume partitions: %d\n",
1314                           iloc->partitionReferenceNum, sbi->s_partitions);
1315                 return -EIO;
1316         }
1317
1318         if (iloc->logicalBlockNum >=
1319             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1320                 udf_debug("block=%d, partition=%d out of range\n",
1321                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1322                 return -EIO;
1323         }
1324
1325         /*
1326          * Set defaults, but the inode is still incomplete!
1327          * Note: get_new_inode() sets the following on a new inode:
1328          *      i_sb = sb
1329          *      i_no = ino
1330          *      i_flags = sb->s_flags
1331          *      i_state = 0
1332          * clean_inode(): zero fills and sets
1333          *      i_count = 1
1334          *      i_nlink = 1
1335          *      i_op = NULL;
1336          */
1337         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1338         if (!bh) {
1339                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1340                 return -EIO;
1341         }
1342
1343         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1344             ident != TAG_IDENT_USE) {
1345                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1346                         inode->i_ino, ident);
1347                 goto out;
1348         }
1349
1350         fe = (struct fileEntry *)bh->b_data;
1351         efe = (struct extendedFileEntry *)bh->b_data;
1352
1353         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1354                 struct buffer_head *ibh;
1355
1356                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1357                 if (ident == TAG_IDENT_IE && ibh) {
1358                         struct kernel_lb_addr loc;
1359                         struct indirectEntry *ie;
1360
1361                         ie = (struct indirectEntry *)ibh->b_data;
1362                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1363
1364                         if (ie->indirectICB.extLength) {
1365                                 brelse(ibh);
1366                                 memcpy(&iinfo->i_location, &loc,
1367                                        sizeof(struct kernel_lb_addr));
1368                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1369                                         udf_err(inode->i_sb,
1370                                                 "too many ICBs in ICB hierarchy"
1371                                                 " (max %d supported)\n",
1372                                                 UDF_MAX_ICB_NESTING);
1373                                         goto out;
1374                                 }
1375                                 brelse(bh);
1376                                 goto reread;
1377                         }
1378                 }
1379                 brelse(ibh);
1380         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1381                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1382                         le16_to_cpu(fe->icbTag.strategyType));
1383                 goto out;
1384         }
1385         if (fe->icbTag.strategyType == cpu_to_le16(4))
1386                 iinfo->i_strat4096 = 0;
1387         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1388                 iinfo->i_strat4096 = 1;
1389
1390         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1391                                                         ICBTAG_FLAG_AD_MASK;
1392         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1393             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1394             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1395                 ret = -EIO;
1396                 goto out;
1397         }
1398         iinfo->i_unique = 0;
1399         iinfo->i_lenEAttr = 0;
1400         iinfo->i_lenExtents = 0;
1401         iinfo->i_lenAlloc = 0;
1402         iinfo->i_next_alloc_block = 0;
1403         iinfo->i_next_alloc_goal = 0;
1404         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1405                 iinfo->i_efe = 1;
1406                 iinfo->i_use = 0;
1407                 ret = udf_alloc_i_data(inode, bs -
1408                                         sizeof(struct extendedFileEntry));
1409                 if (ret)
1410                         goto out;
1411                 memcpy(iinfo->i_ext.i_data,
1412                        bh->b_data + sizeof(struct extendedFileEntry),
1413                        bs - sizeof(struct extendedFileEntry));
1414         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1415                 iinfo->i_efe = 0;
1416                 iinfo->i_use = 0;
1417                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1418                 if (ret)
1419                         goto out;
1420                 memcpy(iinfo->i_ext.i_data,
1421                        bh->b_data + sizeof(struct fileEntry),
1422                        bs - sizeof(struct fileEntry));
1423         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1424                 iinfo->i_efe = 0;
1425                 iinfo->i_use = 1;
1426                 iinfo->i_lenAlloc = le32_to_cpu(
1427                                 ((struct unallocSpaceEntry *)bh->b_data)->
1428                                  lengthAllocDescs);
1429                 ret = udf_alloc_i_data(inode, bs -
1430                                         sizeof(struct unallocSpaceEntry));
1431                 if (ret)
1432                         goto out;
1433                 memcpy(iinfo->i_ext.i_data,
1434                        bh->b_data + sizeof(struct unallocSpaceEntry),
1435                        bs - sizeof(struct unallocSpaceEntry));
1436                 return 0;
1437         }
1438
1439         ret = -EIO;
1440         read_lock(&sbi->s_cred_lock);
1441         i_uid_write(inode, le32_to_cpu(fe->uid));
1442         if (!uid_valid(inode->i_uid) ||
1443             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1444             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1445                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1446
1447         i_gid_write(inode, le32_to_cpu(fe->gid));
1448         if (!gid_valid(inode->i_gid) ||
1449             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1450             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1451                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1452
1453         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1454                         sbi->s_fmode != UDF_INVALID_MODE)
1455                 inode->i_mode = sbi->s_fmode;
1456         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1457                         sbi->s_dmode != UDF_INVALID_MODE)
1458                 inode->i_mode = sbi->s_dmode;
1459         else
1460                 inode->i_mode = udf_convert_permissions(fe);
1461         inode->i_mode &= ~sbi->s_umask;
1462         read_unlock(&sbi->s_cred_lock);
1463
1464         link_count = le16_to_cpu(fe->fileLinkCount);
1465         if (!link_count) {
1466                 if (!hidden_inode) {
1467                         ret = -ESTALE;
1468                         goto out;
1469                 }
1470                 link_count = 1;
1471         }
1472         set_nlink(inode, link_count);
1473
1474         inode->i_size = le64_to_cpu(fe->informationLength);
1475         iinfo->i_lenExtents = inode->i_size;
1476
1477         if (iinfo->i_efe == 0) {
1478                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1479                         (inode->i_sb->s_blocksize_bits - 9);
1480
1481                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1482                         inode->i_atime = sbi->s_record_time;
1483
1484                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1485                                             fe->modificationTime))
1486                         inode->i_mtime = sbi->s_record_time;
1487
1488                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1489                         inode->i_ctime = sbi->s_record_time;
1490
1491                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1492                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1493                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1494                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1495         } else {
1496                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1497                     (inode->i_sb->s_blocksize_bits - 9);
1498
1499                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1500                         inode->i_atime = sbi->s_record_time;
1501
1502                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1503                                             efe->modificationTime))
1504                         inode->i_mtime = sbi->s_record_time;
1505
1506                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1507                         iinfo->i_crtime = sbi->s_record_time;
1508
1509                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1510                         inode->i_ctime = sbi->s_record_time;
1511
1512                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1513                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1514                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1515                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1516         }
1517         inode->i_generation = iinfo->i_unique;
1518
1519         /*
1520          * Sanity check length of allocation descriptors and extended attrs to
1521          * avoid integer overflows
1522          */
1523         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1524                 goto out;
1525         /* Now do exact checks */
1526         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1527                 goto out;
1528         /* Sanity checks for files in ICB so that we don't get confused later */
1529         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1530                 /*
1531                  * For file in ICB data is stored in allocation descriptor
1532                  * so sizes should match
1533                  */
1534                 if (iinfo->i_lenAlloc != inode->i_size)
1535                         goto out;
1536                 /* File in ICB has to fit in there... */
1537                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1538                         goto out;
1539         }
1540
1541         switch (fe->icbTag.fileType) {
1542         case ICBTAG_FILE_TYPE_DIRECTORY:
1543                 inode->i_op = &udf_dir_inode_operations;
1544                 inode->i_fop = &udf_dir_operations;
1545                 inode->i_mode |= S_IFDIR;
1546                 inc_nlink(inode);
1547                 break;
1548         case ICBTAG_FILE_TYPE_REALTIME:
1549         case ICBTAG_FILE_TYPE_REGULAR:
1550         case ICBTAG_FILE_TYPE_UNDEF:
1551         case ICBTAG_FILE_TYPE_VAT20:
1552                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1553                         inode->i_data.a_ops = &udf_adinicb_aops;
1554                 else
1555                         inode->i_data.a_ops = &udf_aops;
1556                 inode->i_op = &udf_file_inode_operations;
1557                 inode->i_fop = &udf_file_operations;
1558                 inode->i_mode |= S_IFREG;
1559                 break;
1560         case ICBTAG_FILE_TYPE_BLOCK:
1561                 inode->i_mode |= S_IFBLK;
1562                 break;
1563         case ICBTAG_FILE_TYPE_CHAR:
1564                 inode->i_mode |= S_IFCHR;
1565                 break;
1566         case ICBTAG_FILE_TYPE_FIFO:
1567                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1568                 break;
1569         case ICBTAG_FILE_TYPE_SOCKET:
1570                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1571                 break;
1572         case ICBTAG_FILE_TYPE_SYMLINK:
1573                 inode->i_data.a_ops = &udf_symlink_aops;
1574                 inode->i_op = &udf_symlink_inode_operations;
1575                 inode_nohighmem(inode);
1576                 inode->i_mode = S_IFLNK | 0777;
1577                 break;
1578         case ICBTAG_FILE_TYPE_MAIN:
1579                 udf_debug("METADATA FILE-----\n");
1580                 break;
1581         case ICBTAG_FILE_TYPE_MIRROR:
1582                 udf_debug("METADATA MIRROR FILE-----\n");
1583                 break;
1584         case ICBTAG_FILE_TYPE_BITMAP:
1585                 udf_debug("METADATA BITMAP FILE-----\n");
1586                 break;
1587         default:
1588                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1589                         inode->i_ino, fe->icbTag.fileType);
1590                 goto out;
1591         }
1592         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1593                 struct deviceSpec *dsea =
1594                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1595                 if (dsea) {
1596                         init_special_inode(inode, inode->i_mode,
1597                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1598                                       le32_to_cpu(dsea->minorDeviceIdent)));
1599                         /* Developer ID ??? */
1600                 } else
1601                         goto out;
1602         }
1603         ret = 0;
1604 out:
1605         brelse(bh);
1606         return ret;
1607 }
1608
1609 static int udf_alloc_i_data(struct inode *inode, size_t size)
1610 {
1611         struct udf_inode_info *iinfo = UDF_I(inode);
1612         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1613         if (!iinfo->i_ext.i_data)
1614                 return -ENOMEM;
1615         return 0;
1616 }
1617
1618 static umode_t udf_convert_permissions(struct fileEntry *fe)
1619 {
1620         umode_t mode;
1621         uint32_t permissions;
1622         uint32_t flags;
1623
1624         permissions = le32_to_cpu(fe->permissions);
1625         flags = le16_to_cpu(fe->icbTag.flags);
1626
1627         mode =  ((permissions) & 0007) |
1628                 ((permissions >> 2) & 0070) |
1629                 ((permissions >> 4) & 0700) |
1630                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1631                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1632                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1633
1634         return mode;
1635 }
1636
1637 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1638 {
1639         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1640 }
1641
1642 static int udf_sync_inode(struct inode *inode)
1643 {
1644         return udf_update_inode(inode, 1);
1645 }
1646
1647 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec time)
1648 {
1649         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1650             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1651              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1652                 iinfo->i_crtime = time;
1653 }
1654
1655 static int udf_update_inode(struct inode *inode, int do_sync)
1656 {
1657         struct buffer_head *bh = NULL;
1658         struct fileEntry *fe;
1659         struct extendedFileEntry *efe;
1660         uint64_t lb_recorded;
1661         uint32_t udfperms;
1662         uint16_t icbflags;
1663         uint16_t crclen;
1664         int err = 0;
1665         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1666         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1667         struct udf_inode_info *iinfo = UDF_I(inode);
1668
1669         bh = udf_tgetblk(inode->i_sb,
1670                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1671         if (!bh) {
1672                 udf_debug("getblk failure\n");
1673                 return -EIO;
1674         }
1675
1676         lock_buffer(bh);
1677         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1678         fe = (struct fileEntry *)bh->b_data;
1679         efe = (struct extendedFileEntry *)bh->b_data;
1680
1681         if (iinfo->i_use) {
1682                 struct unallocSpaceEntry *use =
1683                         (struct unallocSpaceEntry *)bh->b_data;
1684
1685                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1686                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1687                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1688                                         sizeof(struct unallocSpaceEntry));
1689                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1690                 crclen = sizeof(struct unallocSpaceEntry);
1691
1692                 goto finish;
1693         }
1694
1695         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1696                 fe->uid = cpu_to_le32(-1);
1697         else
1698                 fe->uid = cpu_to_le32(i_uid_read(inode));
1699
1700         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1701                 fe->gid = cpu_to_le32(-1);
1702         else
1703                 fe->gid = cpu_to_le32(i_gid_read(inode));
1704
1705         udfperms = ((inode->i_mode & 0007)) |
1706                    ((inode->i_mode & 0070) << 2) |
1707                    ((inode->i_mode & 0700) << 4);
1708
1709         udfperms |= (le32_to_cpu(fe->permissions) &
1710                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1711                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1712                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1713         fe->permissions = cpu_to_le32(udfperms);
1714
1715         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1716                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1717         else
1718                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1719
1720         fe->informationLength = cpu_to_le64(inode->i_size);
1721
1722         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1723                 struct regid *eid;
1724                 struct deviceSpec *dsea =
1725                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1726                 if (!dsea) {
1727                         dsea = (struct deviceSpec *)
1728                                 udf_add_extendedattr(inode,
1729                                                      sizeof(struct deviceSpec) +
1730                                                      sizeof(struct regid), 12, 0x3);
1731                         dsea->attrType = cpu_to_le32(12);
1732                         dsea->attrSubtype = 1;
1733                         dsea->attrLength = cpu_to_le32(
1734                                                 sizeof(struct deviceSpec) +
1735                                                 sizeof(struct regid));
1736                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1737                 }
1738                 eid = (struct regid *)dsea->impUse;
1739                 memset(eid, 0, sizeof(*eid));
1740                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1741                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1742                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1743                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1744                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1745         }
1746
1747         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1748                 lb_recorded = 0; /* No extents => no blocks! */
1749         else
1750                 lb_recorded =
1751                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1752                         (blocksize_bits - 9);
1753
1754         if (iinfo->i_efe == 0) {
1755                 memcpy(bh->b_data + sizeof(struct fileEntry),
1756                        iinfo->i_ext.i_data,
1757                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1758                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1759
1760                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1761                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1762                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1763                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1764                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1765                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1766                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1767                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1768                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1769                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1770                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1771                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1772                 crclen = sizeof(struct fileEntry);
1773         } else {
1774                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1775                        iinfo->i_ext.i_data,
1776                        inode->i_sb->s_blocksize -
1777                                         sizeof(struct extendedFileEntry));
1778                 efe->objectSize = cpu_to_le64(inode->i_size);
1779                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1780
1781                 udf_adjust_time(iinfo, inode->i_atime);
1782                 udf_adjust_time(iinfo, inode->i_mtime);
1783                 udf_adjust_time(iinfo, inode->i_ctime);
1784
1785                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1786                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1787                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1788                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1789
1790                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1791                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1792                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1793                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1794                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1795                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1796                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1797                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1798                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1799                 crclen = sizeof(struct extendedFileEntry);
1800         }
1801
1802 finish:
1803         if (iinfo->i_strat4096) {
1804                 fe->icbTag.strategyType = cpu_to_le16(4096);
1805                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1806                 fe->icbTag.numEntries = cpu_to_le16(2);
1807         } else {
1808                 fe->icbTag.strategyType = cpu_to_le16(4);
1809                 fe->icbTag.numEntries = cpu_to_le16(1);
1810         }
1811
1812         if (iinfo->i_use)
1813                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1814         else if (S_ISDIR(inode->i_mode))
1815                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1816         else if (S_ISREG(inode->i_mode))
1817                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1818         else if (S_ISLNK(inode->i_mode))
1819                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1820         else if (S_ISBLK(inode->i_mode))
1821                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1822         else if (S_ISCHR(inode->i_mode))
1823                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1824         else if (S_ISFIFO(inode->i_mode))
1825                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1826         else if (S_ISSOCK(inode->i_mode))
1827                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1828
1829         icbflags =      iinfo->i_alloc_type |
1830                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1831                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1832                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1833                         (le16_to_cpu(fe->icbTag.flags) &
1834                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1835                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1836
1837         fe->icbTag.flags = cpu_to_le16(icbflags);
1838         if (sbi->s_udfrev >= 0x0200)
1839                 fe->descTag.descVersion = cpu_to_le16(3);
1840         else
1841                 fe->descTag.descVersion = cpu_to_le16(2);
1842         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1843         fe->descTag.tagLocation = cpu_to_le32(
1844                                         iinfo->i_location.logicalBlockNum);
1845         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1846         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1847         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1848                                                   crclen));
1849         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1850
1851         set_buffer_uptodate(bh);
1852         unlock_buffer(bh);
1853
1854         /* write the data blocks */
1855         mark_buffer_dirty(bh);
1856         if (do_sync) {
1857                 sync_dirty_buffer(bh);
1858                 if (buffer_write_io_error(bh)) {
1859                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1860                                  inode->i_ino);
1861                         err = -EIO;
1862                 }
1863         }
1864         brelse(bh);
1865
1866         return err;
1867 }
1868
1869 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1870                          bool hidden_inode)
1871 {
1872         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1873         struct inode *inode = iget_locked(sb, block);
1874         int err;
1875
1876         if (!inode)
1877                 return ERR_PTR(-ENOMEM);
1878
1879         if (!(inode->i_state & I_NEW))
1880                 return inode;
1881
1882         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1883         err = udf_read_inode(inode, hidden_inode);
1884         if (err < 0) {
1885                 iget_failed(inode);
1886                 return ERR_PTR(err);
1887         }
1888         unlock_new_inode(inode);
1889
1890         return inode;
1891 }
1892
1893 int udf_setup_indirect_aext(struct inode *inode, int block,
1894                             struct extent_position *epos)
1895 {
1896         struct super_block *sb = inode->i_sb;
1897         struct buffer_head *bh;
1898         struct allocExtDesc *aed;
1899         struct extent_position nepos;
1900         struct kernel_lb_addr neloc;
1901         int ver, adsize;
1902
1903         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1904                 adsize = sizeof(struct short_ad);
1905         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1906                 adsize = sizeof(struct long_ad);
1907         else
1908                 return -EIO;
1909
1910         neloc.logicalBlockNum = block;
1911         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1912
1913         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1914         if (!bh)
1915                 return -EIO;
1916         lock_buffer(bh);
1917         memset(bh->b_data, 0x00, sb->s_blocksize);
1918         set_buffer_uptodate(bh);
1919         unlock_buffer(bh);
1920         mark_buffer_dirty_inode(bh, inode);
1921
1922         aed = (struct allocExtDesc *)(bh->b_data);
1923         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1924                 aed->previousAllocExtLocation =
1925                                 cpu_to_le32(epos->block.logicalBlockNum);
1926         }
1927         aed->lengthAllocDescs = cpu_to_le32(0);
1928         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1929                 ver = 3;
1930         else
1931                 ver = 2;
1932         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1933                     sizeof(struct tag));
1934
1935         nepos.block = neloc;
1936         nepos.offset = sizeof(struct allocExtDesc);
1937         nepos.bh = bh;
1938
1939         /*
1940          * Do we have to copy current last extent to make space for indirect
1941          * one?
1942          */
1943         if (epos->offset + adsize > sb->s_blocksize) {
1944                 struct kernel_lb_addr cp_loc;
1945                 uint32_t cp_len;
1946                 int cp_type;
1947
1948                 epos->offset -= adsize;
1949                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1950                 cp_len |= ((uint32_t)cp_type) << 30;
1951
1952                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1953                 udf_write_aext(inode, epos, &nepos.block,
1954                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1955         } else {
1956                 __udf_add_aext(inode, epos, &nepos.block,
1957                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1958         }
1959
1960         brelse(epos->bh);
1961         *epos = nepos;
1962
1963         return 0;
1964 }
1965
1966 /*
1967  * Append extent at the given position - should be the first free one in inode
1968  * / indirect extent. This function assumes there is enough space in the inode
1969  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1970  */
1971 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1972                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1973 {
1974         struct udf_inode_info *iinfo = UDF_I(inode);
1975         struct allocExtDesc *aed;
1976         int adsize;
1977
1978         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1979                 adsize = sizeof(struct short_ad);
1980         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1981                 adsize = sizeof(struct long_ad);
1982         else
1983                 return -EIO;
1984
1985         if (!epos->bh) {
1986                 WARN_ON(iinfo->i_lenAlloc !=
1987                         epos->offset - udf_file_entry_alloc_offset(inode));
1988         } else {
1989                 aed = (struct allocExtDesc *)epos->bh->b_data;
1990                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
1991                         epos->offset - sizeof(struct allocExtDesc));
1992                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1993         }
1994
1995         udf_write_aext(inode, epos, eloc, elen, inc);
1996
1997         if (!epos->bh) {
1998                 iinfo->i_lenAlloc += adsize;
1999                 mark_inode_dirty(inode);
2000         } else {
2001                 aed = (struct allocExtDesc *)epos->bh->b_data;
2002                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2003                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2004                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2005                         udf_update_tag(epos->bh->b_data,
2006                                         epos->offset + (inc ? 0 : adsize));
2007                 else
2008                         udf_update_tag(epos->bh->b_data,
2009                                         sizeof(struct allocExtDesc));
2010                 mark_buffer_dirty_inode(epos->bh, inode);
2011         }
2012
2013         return 0;
2014 }
2015
2016 /*
2017  * Append extent at given position - should be the first free one in inode
2018  * / indirect extent. Takes care of allocating and linking indirect blocks.
2019  */
2020 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2021                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2022 {
2023         int adsize;
2024         struct super_block *sb = inode->i_sb;
2025
2026         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2027                 adsize = sizeof(struct short_ad);
2028         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2029                 adsize = sizeof(struct long_ad);
2030         else
2031                 return -EIO;
2032
2033         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2034                 int err;
2035                 int new_block;
2036
2037                 new_block = udf_new_block(sb, NULL,
2038                                           epos->block.partitionReferenceNum,
2039                                           epos->block.logicalBlockNum, &err);
2040                 if (!new_block)
2041                         return -ENOSPC;
2042
2043                 err = udf_setup_indirect_aext(inode, new_block, epos);
2044                 if (err)
2045                         return err;
2046         }
2047
2048         return __udf_add_aext(inode, epos, eloc, elen, inc);
2049 }
2050
2051 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2052                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2053 {
2054         int adsize;
2055         uint8_t *ptr;
2056         struct short_ad *sad;
2057         struct long_ad *lad;
2058         struct udf_inode_info *iinfo = UDF_I(inode);
2059
2060         if (!epos->bh)
2061                 ptr = iinfo->i_ext.i_data + epos->offset -
2062                         udf_file_entry_alloc_offset(inode) +
2063                         iinfo->i_lenEAttr;
2064         else
2065                 ptr = epos->bh->b_data + epos->offset;
2066
2067         switch (iinfo->i_alloc_type) {
2068         case ICBTAG_FLAG_AD_SHORT:
2069                 sad = (struct short_ad *)ptr;
2070                 sad->extLength = cpu_to_le32(elen);
2071                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2072                 adsize = sizeof(struct short_ad);
2073                 break;
2074         case ICBTAG_FLAG_AD_LONG:
2075                 lad = (struct long_ad *)ptr;
2076                 lad->extLength = cpu_to_le32(elen);
2077                 lad->extLocation = cpu_to_lelb(*eloc);
2078                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2079                 adsize = sizeof(struct long_ad);
2080                 break;
2081         default:
2082                 return;
2083         }
2084
2085         if (epos->bh) {
2086                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2087                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2088                         struct allocExtDesc *aed =
2089                                 (struct allocExtDesc *)epos->bh->b_data;
2090                         udf_update_tag(epos->bh->b_data,
2091                                        le32_to_cpu(aed->lengthAllocDescs) +
2092                                        sizeof(struct allocExtDesc));
2093                 }
2094                 mark_buffer_dirty_inode(epos->bh, inode);
2095         } else {
2096                 mark_inode_dirty(inode);
2097         }
2098
2099         if (inc)
2100                 epos->offset += adsize;
2101 }
2102
2103 /*
2104  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2105  * someone does some weird stuff.
2106  */
2107 #define UDF_MAX_INDIR_EXTS 16
2108
2109 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2110                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2111 {
2112         int8_t etype;
2113         unsigned int indirections = 0;
2114
2115         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2116                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2117                 int block;
2118
2119                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2120                         udf_err(inode->i_sb,
2121                                 "too many indirect extents in inode %lu\n",
2122                                 inode->i_ino);
2123                         return -1;
2124                 }
2125
2126                 epos->block = *eloc;
2127                 epos->offset = sizeof(struct allocExtDesc);
2128                 brelse(epos->bh);
2129                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2130                 epos->bh = udf_tread(inode->i_sb, block);
2131                 if (!epos->bh) {
2132                         udf_debug("reading block %d failed!\n", block);
2133                         return -1;
2134                 }
2135         }
2136
2137         return etype;
2138 }
2139
2140 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2141                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2142 {
2143         int alen;
2144         int8_t etype;
2145         uint8_t *ptr;
2146         struct short_ad *sad;
2147         struct long_ad *lad;
2148         struct udf_inode_info *iinfo = UDF_I(inode);
2149
2150         if (!epos->bh) {
2151                 if (!epos->offset)
2152                         epos->offset = udf_file_entry_alloc_offset(inode);
2153                 ptr = iinfo->i_ext.i_data + epos->offset -
2154                         udf_file_entry_alloc_offset(inode) +
2155                         iinfo->i_lenEAttr;
2156                 alen = udf_file_entry_alloc_offset(inode) +
2157                                                         iinfo->i_lenAlloc;
2158         } else {
2159                 if (!epos->offset)
2160                         epos->offset = sizeof(struct allocExtDesc);
2161                 ptr = epos->bh->b_data + epos->offset;
2162                 alen = sizeof(struct allocExtDesc) +
2163                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2164                                                         lengthAllocDescs);
2165         }
2166
2167         switch (iinfo->i_alloc_type) {
2168         case ICBTAG_FLAG_AD_SHORT:
2169                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2170                 if (!sad)
2171                         return -1;
2172                 etype = le32_to_cpu(sad->extLength) >> 30;
2173                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2174                 eloc->partitionReferenceNum =
2175                                 iinfo->i_location.partitionReferenceNum;
2176                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2177                 break;
2178         case ICBTAG_FLAG_AD_LONG:
2179                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2180                 if (!lad)
2181                         return -1;
2182                 etype = le32_to_cpu(lad->extLength) >> 30;
2183                 *eloc = lelb_to_cpu(lad->extLocation);
2184                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2185                 break;
2186         default:
2187                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2188                 return -1;
2189         }
2190
2191         return etype;
2192 }
2193
2194 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2195                               struct kernel_lb_addr neloc, uint32_t nelen)
2196 {
2197         struct kernel_lb_addr oeloc;
2198         uint32_t oelen;
2199         int8_t etype;
2200
2201         if (epos.bh)
2202                 get_bh(epos.bh);
2203
2204         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2205                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2206                 neloc = oeloc;
2207                 nelen = (etype << 30) | oelen;
2208         }
2209         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2210         brelse(epos.bh);
2211
2212         return (nelen >> 30);
2213 }
2214
2215 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2216                        struct kernel_lb_addr eloc, uint32_t elen)
2217 {
2218         struct extent_position oepos;
2219         int adsize;
2220         int8_t etype;
2221         struct allocExtDesc *aed;
2222         struct udf_inode_info *iinfo;
2223
2224         if (epos.bh) {
2225                 get_bh(epos.bh);
2226                 get_bh(epos.bh);
2227         }
2228
2229         iinfo = UDF_I(inode);
2230         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2231                 adsize = sizeof(struct short_ad);
2232         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2233                 adsize = sizeof(struct long_ad);
2234         else
2235                 adsize = 0;
2236
2237         oepos = epos;
2238         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2239                 return -1;
2240
2241         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2242                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2243                 if (oepos.bh != epos.bh) {
2244                         oepos.block = epos.block;
2245                         brelse(oepos.bh);
2246                         get_bh(epos.bh);
2247                         oepos.bh = epos.bh;
2248                         oepos.offset = epos.offset - adsize;
2249                 }
2250         }
2251         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2252         elen = 0;
2253
2254         if (epos.bh != oepos.bh) {
2255                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2256                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2257                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2258                 if (!oepos.bh) {
2259                         iinfo->i_lenAlloc -= (adsize * 2);
2260                         mark_inode_dirty(inode);
2261                 } else {
2262                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2263                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2264                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2265                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2266                                 udf_update_tag(oepos.bh->b_data,
2267                                                 oepos.offset - (2 * adsize));
2268                         else
2269                                 udf_update_tag(oepos.bh->b_data,
2270                                                 sizeof(struct allocExtDesc));
2271                         mark_buffer_dirty_inode(oepos.bh, inode);
2272                 }
2273         } else {
2274                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2275                 if (!oepos.bh) {
2276                         iinfo->i_lenAlloc -= adsize;
2277                         mark_inode_dirty(inode);
2278                 } else {
2279                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2280                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2281                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2282                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2283                                 udf_update_tag(oepos.bh->b_data,
2284                                                 epos.offset - adsize);
2285                         else
2286                                 udf_update_tag(oepos.bh->b_data,
2287                                                 sizeof(struct allocExtDesc));
2288                         mark_buffer_dirty_inode(oepos.bh, inode);
2289                 }
2290         }
2291
2292         brelse(epos.bh);
2293         brelse(oepos.bh);
2294
2295         return (elen >> 30);
2296 }
2297
2298 int8_t inode_bmap(struct inode *inode, sector_t block,
2299                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2300                   uint32_t *elen, sector_t *offset)
2301 {
2302         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2303         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2304         int8_t etype;
2305         struct udf_inode_info *iinfo;
2306
2307         iinfo = UDF_I(inode);
2308         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2309                 pos->offset = 0;
2310                 pos->block = iinfo->i_location;
2311                 pos->bh = NULL;
2312         }
2313         *elen = 0;
2314         do {
2315                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2316                 if (etype == -1) {
2317                         *offset = (bcount - lbcount) >> blocksize_bits;
2318                         iinfo->i_lenExtents = lbcount;
2319                         return -1;
2320                 }
2321                 lbcount += *elen;
2322         } while (lbcount <= bcount);
2323         /* update extent cache */
2324         udf_update_extent_cache(inode, lbcount - *elen, pos);
2325         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2326
2327         return etype;
2328 }
2329
2330 long udf_block_map(struct inode *inode, sector_t block)
2331 {
2332         struct kernel_lb_addr eloc;
2333         uint32_t elen;
2334         sector_t offset;
2335         struct extent_position epos = {};
2336         int ret;
2337
2338         down_read(&UDF_I(inode)->i_data_sem);
2339
2340         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2341                                                 (EXT_RECORDED_ALLOCATED >> 30))
2342                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2343         else
2344                 ret = 0;
2345
2346         up_read(&UDF_I(inode)->i_data_sem);
2347         brelse(epos.bh);
2348
2349         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2350                 return udf_fixed_to_variable(ret);
2351         else
2352                 return ret;
2353 }