fs/udf/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * inode.c
   4  *
   5  * PURPOSE
   6  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   7  *
   8  * COPYRIGHT
   9  *  (C) 1998 Dave Boynton
  10  *  (C) 1998-2004 Ben Fennema
  11  *  (C) 1999-2000 Stelias Computing Inc
  12  *
  13  * HISTORY
  14  *
  15  *  10/04/98 dgb  Added rudimentary directory functions
  16  *  10/07/98      Fully working udf_block_map! It works!
  17  *  11/25/98      bmap altered to better support extents
  18  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  19  *                and udf_read_inode
  20  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  21  *                block boundaries (which is not actually allowed)
  22  *  12/20/98      added support for strategy 4096
  23  *  03/07/99      rewrote udf_block_map (again)
  24  *                New funcs, inode_bmap, udf_next_aext
  25  *  04/19/99      Support for writing device EA's for major/minor #
  26  */
  27
  28 #include "udfdecl.h"
  29 #include <linux/mm.h>
  30 #include <linux/module.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/writeback.h>
  33 #include <linux/slab.h>
  34 #include <linux/crc-itu-t.h>
  35 #include <linux/mpage.h>
  36 #include <linux/uio.h>
  37 #include <linux/bio.h>
  38
  39 #include "udf_i.h"
  40 #include "udf_sb.h"
  41
  42 #define EXTENT_MERGE_SIZE 5
  43
  44 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
  45                          FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
  46                          FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
  47
  48 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
  49                          FE_PERM_O_DELETE)
  50
  51 struct udf_map_rq;
  52
  53 static umode_t udf_convert_permissions(struct fileEntry *);
  54 static int udf_update_inode(struct inode *, int);
  55 static int udf_sync_inode(struct inode *inode);
  56 static int udf_alloc_i_data(struct inode *inode, size_t size);
  57 static int inode_getblk(struct inode *inode, struct udf_map_rq *map);
  58 static int udf_insert_aext(struct inode *, struct extent_position,
  59                            struct kernel_lb_addr, uint32_t);
  60 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
  61                               struct kernel_long_ad *, int *);
  62 static void udf_prealloc_extents(struct inode *, int, int,
  63                                  struct kernel_long_ad *, int *);
  64 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  65 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  66                               int, struct extent_position *);
  67 static int udf_get_block_wb(struct inode *inode, sector_t block,
  68                             struct buffer_head *bh_result, int create);
  69
  70 static void __udf_clear_extent_cache(struct inode *inode)
  71 {
  72         struct udf_inode_info *iinfo = UDF_I(inode);
  73
  74         if (iinfo->cached_extent.lstart != -1) {
  75                 brelse(iinfo->cached_extent.epos.bh);
  76                 iinfo->cached_extent.lstart = -1;
  77         }
  78 }
  79
  80 /* Invalidate extent cache */
  81 static void udf_clear_extent_cache(struct inode *inode)
  82 {
  83         struct udf_inode_info *iinfo = UDF_I(inode);
  84
  85         spin_lock(&iinfo->i_extent_cache_lock);
  86         __udf_clear_extent_cache(inode);
  87         spin_unlock(&iinfo->i_extent_cache_lock);
  88 }
  89
  90 /* Return contents of extent cache */
  91 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  92                                  loff_t *lbcount, struct extent_position *pos)
  93 {
  94         struct udf_inode_info *iinfo = UDF_I(inode);
  95         int ret = 0;
  96
  97         spin_lock(&iinfo->i_extent_cache_lock);
  98         if ((iinfo->cached_extent.lstart <= bcount) &&
  99             (iinfo->cached_extent.lstart != -1)) {
 100                 /* Cache hit */
 101                 *lbcount = iinfo->cached_extent.lstart;
 102                 memcpy(pos, &iinfo->cached_extent.epos,
 103                        sizeof(struct extent_position));
 104                 if (pos->bh)
 105                         get_bh(pos->bh);
 106                 ret = 1;
 107         }
 108         spin_unlock(&iinfo->i_extent_cache_lock);
 109         return ret;
 110 }
 111
 112 /* Add extent to extent cache */
 113 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 114                                     struct extent_position *pos)
 115 {
 116         struct udf_inode_info *iinfo = UDF_I(inode);
 117
 118         spin_lock(&iinfo->i_extent_cache_lock);
 119         /* Invalidate previously cached extent */
 120         __udf_clear_extent_cache(inode);
 121         if (pos->bh)
 122                 get_bh(pos->bh);
 123         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 124         iinfo->cached_extent.lstart = estart;
 125         switch (iinfo->i_alloc_type) {
 126         case ICBTAG_FLAG_AD_SHORT:
 127                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 128                 break;
 129         case ICBTAG_FLAG_AD_LONG:
 130                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 131                 break;
 132         }
 133         spin_unlock(&iinfo->i_extent_cache_lock);
 134 }
 135
 136 void udf_evict_inode(struct inode *inode)
 137 {
 138         struct udf_inode_info *iinfo = UDF_I(inode);
 139         int want_delete = 0;
 140
 141         if (!is_bad_inode(inode)) {
 142                 if (!inode->i_nlink) {
 143                         want_delete = 1;
 144                         udf_setsize(inode, 0);
 145                         udf_update_inode(inode, IS_SYNC(inode));
 146                 }
 147                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 148                     inode->i_size != iinfo->i_lenExtents) {
 149                         udf_warn(inode->i_sb,
 150                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 151                                  inode->i_ino, inode->i_mode,
 152                                  (unsigned long long)inode->i_size,
 153                                  (unsigned long long)iinfo->i_lenExtents);
 154                 }
 155         }
 156         truncate_inode_pages_final(&inode->i_data);
 157         invalidate_inode_buffers(inode);
 158         clear_inode(inode);
 159         kfree(iinfo->i_data);
 160         iinfo->i_data = NULL;
 161         udf_clear_extent_cache(inode);
 162         if (want_delete) {
 163                 udf_free_inode(inode);
 164         }
 165 }
 166
 167 static void udf_write_failed(struct address_space *mapping, loff_t to)
 168 {
 169         struct inode *inode = mapping->host;
 170         struct udf_inode_info *iinfo = UDF_I(inode);
 171         loff_t isize = inode->i_size;
 172
 173         if (to > isize) {
 174                 truncate_pagecache(inode, isize);
 175                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 176                         down_write(&iinfo->i_data_sem);
 177                         udf_clear_extent_cache(inode);
 178                         udf_truncate_extents(inode);
 179                         up_write(&iinfo->i_data_sem);
 180                 }
 181         }
 182 }
 183
 184 static int udf_adinicb_writepage(struct folio *folio,
 185                                  struct writeback_control *wbc, void *data)
 186 {
 187         struct inode *inode = folio->mapping->host;
 188         struct udf_inode_info *iinfo = UDF_I(inode);
 189
 190         BUG_ON(!folio_test_locked(folio));
 191         BUG_ON(folio->index != 0);
 192         memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 0,
 193                        i_size_read(inode));
 194         folio_unlock(folio);
 195         mark_inode_dirty(inode);
 196
 197         return 0;
 198 }
 199
 200 static int udf_writepages(struct address_space *mapping,
 201                           struct writeback_control *wbc)
 202 {
 203         struct inode *inode = mapping->host;
 204         struct udf_inode_info *iinfo = UDF_I(inode);
 205
 206         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 207                 return mpage_writepages(mapping, wbc, udf_get_block_wb);
 208         return write_cache_pages(mapping, wbc, udf_adinicb_writepage, NULL);
 209 }
 210
 211 static void udf_adinicb_read_folio(struct folio *folio)
 212 {
 213         struct inode *inode = folio->mapping->host;
 214         struct udf_inode_info *iinfo = UDF_I(inode);
 215         loff_t isize = i_size_read(inode);
 216
 217         folio_fill_tail(folio, 0, iinfo->i_data + iinfo->i_lenEAttr, isize);
 218         folio_mark_uptodate(folio);
 219 }
 220
 221 static int udf_read_folio(struct file *file, struct folio *folio)
 222 {
 223         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 224
 225         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 226                 udf_adinicb_read_folio(folio);
 227                 folio_unlock(folio);
 228                 return 0;
 229         }
 230         return mpage_read_folio(folio, udf_get_block);
 231 }
 232
 233 static void udf_readahead(struct readahead_control *rac)
 234 {
 235         struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
 236
 237         /*
 238          * No readahead needed for in-ICB files and udf_get_block() would get
 239          * confused for such file anyway.
 240          */
 241         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 242                 return;
 243
 244         mpage_readahead(rac, udf_get_block);
 245 }
 246
 247 static int udf_write_begin(struct file *file, struct address_space *mapping,
 248                            loff_t pos, unsigned len,
 249                            struct folio **foliop, void **fsdata)
 250 {
 251         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 252         struct folio *folio;
 253         int ret;
 254
 255         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 256                 ret = block_write_begin(mapping, pos, len, foliop,
 257                                         udf_get_block);
 258                 if (unlikely(ret))
 259                         udf_write_failed(mapping, pos + len);
 260                 return ret;
 261         }
 262         if (WARN_ON_ONCE(pos >= PAGE_SIZE))
 263                 return -EIO;
 264         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 265                         mapping_gfp_mask(mapping));
 266         if (IS_ERR(folio))
 267                 return PTR_ERR(folio);
 268         *foliop = folio;
 269         if (!folio_test_uptodate(folio))
 270                 udf_adinicb_read_folio(folio);
 271         return 0;
 272 }
 273
 274 static int udf_write_end(struct file *file, struct address_space *mapping,
 275                          loff_t pos, unsigned len, unsigned copied,
 276                          struct folio *folio, void *fsdata)
 277 {
 278         struct inode *inode = file_inode(file);
 279         loff_t last_pos;
 280
 281         if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 282                 return generic_write_end(file, mapping, pos, len, copied, folio,
 283                                          fsdata);
 284         last_pos = pos + copied;
 285         if (last_pos > inode->i_size)
 286                 i_size_write(inode, last_pos);
 287         folio_mark_dirty(folio);
 288         folio_unlock(folio);
 289         folio_put(folio);
 290
 291         return copied;
 292 }
 293
 294 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 295 {
 296         struct file *file = iocb->ki_filp;
 297         struct address_space *mapping = file->f_mapping;
 298         struct inode *inode = mapping->host;
 299         size_t count = iov_iter_count(iter);
 300         ssize_t ret;
 301
 302         /* Fallback to buffered IO for in-ICB files */
 303         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 304                 return 0;
 305         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 306         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 307                 udf_write_failed(mapping, iocb->ki_pos + count);
 308         return ret;
 309 }
 310
 311 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 312 {
 313         struct udf_inode_info *iinfo = UDF_I(mapping->host);
 314
 315         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 316                 return -EINVAL;
 317         return generic_block_bmap(mapping, block, udf_get_block);
 318 }
 319
 320 const struct address_space_operations udf_aops = {
 321         .dirty_folio    = block_dirty_folio,
 322         .invalidate_folio = block_invalidate_folio,
 323         .read_folio     = udf_read_folio,
 324         .readahead      = udf_readahead,
 325         .writepages     = udf_writepages,
 326         .write_begin    = udf_write_begin,
 327         .write_end      = udf_write_end,
 328         .direct_IO      = udf_direct_IO,
 329         .bmap           = udf_bmap,
 330         .migrate_folio  = buffer_migrate_folio,
 331 };
 332
 333 /*
 334  * Expand file stored in ICB to a normal one-block-file
 335  *
 336  * This function requires i_mutex held
 337  */
 338 int udf_expand_file_adinicb(struct inode *inode)
 339 {
 340         struct folio *folio;
 341         struct udf_inode_info *iinfo = UDF_I(inode);
 342         int err;
 343
 344         WARN_ON_ONCE(!inode_is_locked(inode));
 345         if (!iinfo->i_lenAlloc) {
 346                 down_write(&iinfo->i_data_sem);
 347                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 348                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 349                 else
 350                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 351                 up_write(&iinfo->i_data_sem);
 352                 mark_inode_dirty(inode);
 353                 return 0;
 354         }
 355
 356         folio = __filemap_get_folio(inode->i_mapping, 0,
 357                         FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL);
 358         if (IS_ERR(folio))
 359                 return PTR_ERR(folio);
 360
 361         if (!folio_test_uptodate(folio))
 362                 udf_adinicb_read_folio(folio);
 363         down_write(&iinfo->i_data_sem);
 364         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 365                iinfo->i_lenAlloc);
 366         iinfo->i_lenAlloc = 0;
 367         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 368                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 369         else
 370                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 371         folio_mark_dirty(folio);
 372         folio_unlock(folio);
 373         up_write(&iinfo->i_data_sem);
 374         err = filemap_fdatawrite(inode->i_mapping);
 375         if (err) {
 376                 /* Restore everything back so that we don't lose data... */
 377                 folio_lock(folio);
 378                 down_write(&iinfo->i_data_sem);
 379                 memcpy_from_folio(iinfo->i_data + iinfo->i_lenEAttr,
 380                                 folio, 0, inode->i_size);
 381                 folio_unlock(folio);
 382                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 383                 iinfo->i_lenAlloc = inode->i_size;
 384                 up_write(&iinfo->i_data_sem);
 385         }
 386         folio_put(folio);
 387         mark_inode_dirty(inode);
 388
 389         return err;
 390 }
 391
 392 #define UDF_MAP_CREATE          0x01    /* Mapping can allocate new blocks */
 393 #define UDF_MAP_NOPREALLOC      0x02    /* Do not preallocate blocks */
 394
 395 #define UDF_BLK_MAPPED  0x01    /* Block was successfully mapped */
 396 #define UDF_BLK_NEW     0x02    /* Block was freshly allocated */
 397
 398 struct udf_map_rq {
 399         sector_t lblk;
 400         udf_pblk_t pblk;
 401         int iflags;             /* UDF_MAP_ flags determining behavior */
 402         int oflags;             /* UDF_BLK_ flags reporting results */
 403 };
 404
 405 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
 406 {
 407         int ret;
 408         struct udf_inode_info *iinfo = UDF_I(inode);
 409
 410         if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
 411                 return -EFSCORRUPTED;
 412
 413         map->oflags = 0;
 414         if (!(map->iflags & UDF_MAP_CREATE)) {
 415                 struct kernel_lb_addr eloc;
 416                 uint32_t elen;
 417                 sector_t offset;
 418                 struct extent_position epos = {};
 419                 int8_t etype;
 420
 421                 down_read(&iinfo->i_data_sem);
 422                 ret = inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset,
 423                                  &etype);
 424                 if (ret < 0)
 425                         goto out_read;
 426                 if (ret > 0 && etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 427                         map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
 428                                                         offset);
 429                         map->oflags |= UDF_BLK_MAPPED;
 430                         ret = 0;
 431                 }
 432 out_read:
 433                 up_read(&iinfo->i_data_sem);
 434                 brelse(epos.bh);
 435
 436                 return ret;
 437         }
 438
 439         down_write(&iinfo->i_data_sem);
 440         /*
 441          * Block beyond EOF and prealloc extents? Just discard preallocation
 442          * as it is not useful and complicates things.
 443          */
 444         if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
 445                 udf_discard_prealloc(inode);
 446         udf_clear_extent_cache(inode);
 447         ret = inode_getblk(inode, map);
 448         up_write(&iinfo->i_data_sem);
 449         return ret;
 450 }
 451
 452 static int __udf_get_block(struct inode *inode, sector_t block,
 453                            struct buffer_head *bh_result, int flags)
 454 {
 455         int err;
 456         struct udf_map_rq map = {
 457                 .lblk = block,
 458                 .iflags = flags,
 459         };
 460
 461         err = udf_map_block(inode, &map);
 462         if (err < 0)
 463                 return err;
 464         if (map.oflags & UDF_BLK_MAPPED) {
 465                 map_bh(bh_result, inode->i_sb, map.pblk);
 466                 if (map.oflags & UDF_BLK_NEW)
 467                         set_buffer_new(bh_result);
 468         }
 469         return 0;
 470 }
 471
 472 int udf_get_block(struct inode *inode, sector_t block,
 473                   struct buffer_head *bh_result, int create)
 474 {
 475         int flags = create ? UDF_MAP_CREATE : 0;
 476
 477         /*
 478          * We preallocate blocks only for regular files. It also makes sense
 479          * for directories but there's a problem when to drop the
 480          * preallocation. We might use some delayed work for that but I feel
 481          * it's overengineering for a filesystem like UDF.
 482          */
 483         if (!S_ISREG(inode->i_mode))
 484                 flags |= UDF_MAP_NOPREALLOC;
 485         return __udf_get_block(inode, block, bh_result, flags);
 486 }
 487
 488 /*
 489  * We shouldn't be allocating blocks on page writeback since we allocate them
 490  * on page fault. We can spot dirty buffers without allocated blocks though
 491  * when truncate expands file. These however don't have valid data so we can
 492  * safely ignore them. So never allocate blocks from page writeback.
 493  */
 494 static int udf_get_block_wb(struct inode *inode, sector_t block,
 495                             struct buffer_head *bh_result, int create)
 496 {
 497         return __udf_get_block(inode, block, bh_result, 0);
 498 }
 499
 500 /* Extend the file with new blocks totaling 'new_block_bytes',
 501  * return the number of extents added
 502  */
 503 static int udf_do_extend_file(struct inode *inode,
 504                               struct extent_position *last_pos,
 505                               struct kernel_long_ad *last_ext,
 506                               loff_t new_block_bytes)
 507 {
 508         uint32_t add;
 509         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 510         struct super_block *sb = inode->i_sb;
 511         struct udf_inode_info *iinfo;
 512         int err;
 513
 514         /* The previous extent is fake and we should not extend by anything
 515          * - there's nothing to do... */
 516         if (!new_block_bytes && fake)
 517                 return 0;
 518
 519         iinfo = UDF_I(inode);
 520         /* Round the last extent up to a multiple of block size */
 521         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 522                 last_ext->extLength =
 523                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 524                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 525                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 526                 iinfo->i_lenExtents =
 527                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 528                         ~(sb->s_blocksize - 1);
 529         }
 530
 531         add = 0;
 532         /* Can we merge with the previous extent? */
 533         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 534                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 535                 add = (1 << 30) - sb->s_blocksize -
 536                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 537                 if (add > new_block_bytes)
 538                         add = new_block_bytes;
 539                 new_block_bytes -= add;
 540                 last_ext->extLength += add;
 541         }
 542
 543         if (fake) {
 544                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 545                                    last_ext->extLength, 1);
 546                 if (err < 0)
 547                         goto out_err;
 548                 count++;
 549         } else {
 550                 struct kernel_lb_addr tmploc;
 551                 uint32_t tmplen;
 552                 int8_t tmptype;
 553
 554                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 555                                 last_ext->extLength, 1);
 556
 557                 /*
 558                  * We've rewritten the last extent. If we are going to add
 559                  * more extents, we may need to enter possible following
 560                  * empty indirect extent.
 561                  */
 562                 if (new_block_bytes) {
 563                         err = udf_next_aext(inode, last_pos, &tmploc, &tmplen,
 564                                             &tmptype, 0);
 565                         if (err < 0)
 566                                 goto out_err;
 567                 }
 568         }
 569         iinfo->i_lenExtents += add;
 570
 571         /* Managed to do everything necessary? */
 572         if (!new_block_bytes)
 573                 goto out;
 574
 575         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 576         last_ext->extLocation.logicalBlockNum = 0;
 577         last_ext->extLocation.partitionReferenceNum = 0;
 578         add = (1 << 30) - sb->s_blocksize;
 579         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 580
 581         /* Create enough extents to cover the whole hole */
 582         while (new_block_bytes > add) {
 583                 new_block_bytes -= add;
 584                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 585                                    last_ext->extLength, 1);
 586                 if (err)
 587                         goto out_err;
 588                 iinfo->i_lenExtents += add;
 589                 count++;
 590         }
 591         if (new_block_bytes) {
 592                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 593                         new_block_bytes;
 594                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 595                                    last_ext->extLength, 1);
 596                 if (err)
 597                         goto out_err;
 598                 iinfo->i_lenExtents += new_block_bytes;
 599                 count++;
 600         }
 601
 602 out:
 603         /* last_pos should point to the last written extent... */
 604         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 605                 last_pos->offset -= sizeof(struct short_ad);
 606         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 607                 last_pos->offset -= sizeof(struct long_ad);
 608         else
 609                 return -EIO;
 610
 611         return count;
 612 out_err:
 613         /* Remove extents we've created so far */
 614         udf_clear_extent_cache(inode);
 615         udf_truncate_extents(inode);
 616         return err;
 617 }
 618
 619 /* Extend the final block of the file to final_block_len bytes */
 620 static void udf_do_extend_final_block(struct inode *inode,
 621                                       struct extent_position *last_pos,
 622                                       struct kernel_long_ad *last_ext,
 623                                       uint32_t new_elen)
 624 {
 625         uint32_t added_bytes;
 626
 627         /*
 628          * Extent already large enough? It may be already rounded up to block
 629          * size...
 630          */
 631         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 632                 return;
 633         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 634         last_ext->extLength += added_bytes;
 635         UDF_I(inode)->i_lenExtents += added_bytes;
 636
 637         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 638                         last_ext->extLength, 1);
 639 }
 640
 641 static int udf_extend_file(struct inode *inode, loff_t newsize)
 642 {
 643
 644         struct extent_position epos;
 645         struct kernel_lb_addr eloc;
 646         uint32_t elen;
 647         int8_t etype;
 648         struct super_block *sb = inode->i_sb;
 649         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 650         loff_t new_elen;
 651         int adsize;
 652         struct udf_inode_info *iinfo = UDF_I(inode);
 653         struct kernel_long_ad extent;
 654         int err = 0;
 655         bool within_last_ext;
 656
 657         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 658                 adsize = sizeof(struct short_ad);
 659         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 660                 adsize = sizeof(struct long_ad);
 661         else
 662                 BUG();
 663
 664         down_write(&iinfo->i_data_sem);
 665         /*
 666          * When creating hole in file, just don't bother with preserving
 667          * preallocation. It likely won't be very useful anyway.
 668          */
 669         udf_discard_prealloc(inode);
 670
 671         err = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset, &etype);
 672         if (err < 0)
 673                 goto out;
 674         within_last_ext = (err == 1);
 675         /* We don't expect extents past EOF... */
 676         WARN_ON_ONCE(within_last_ext &&
 677                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 678
 679         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 680             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 681                 /* File has no extents at all or has empty last
 682                  * indirect extent! Create a fake extent... */
 683                 extent.extLocation.logicalBlockNum = 0;
 684                 extent.extLocation.partitionReferenceNum = 0;
 685                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 686         } else {
 687                 epos.offset -= adsize;
 688                 err = udf_next_aext(inode, &epos, &extent.extLocation,
 689                                     &extent.extLength, &etype, 0);
 690                 if (err <= 0)
 691                         goto out;
 692                 extent.extLength |= etype << 30;
 693         }
 694
 695         new_elen = ((loff_t)offset << inode->i_blkbits) |
 696                                         (newsize & (sb->s_blocksize - 1));
 697
 698         /* File has extent covering the new size (could happen when extending
 699          * inside a block)?
 700          */
 701         if (within_last_ext) {
 702                 /* Extending file within the last file block */
 703                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 704         } else {
 705                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 706         }
 707
 708         if (err < 0)
 709                 goto out;
 710         err = 0;
 711 out:
 712         brelse(epos.bh);
 713         up_write(&iinfo->i_data_sem);
 714         return err;
 715 }
 716
 717 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
 718 {
 719         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 720         struct extent_position prev_epos, cur_epos, next_epos;
 721         int count = 0, startnum = 0, endnum = 0;
 722         uint32_t elen = 0, tmpelen;
 723         struct kernel_lb_addr eloc, tmpeloc;
 724         int c = 1;
 725         loff_t lbcount = 0, b_off = 0;
 726         udf_pblk_t newblocknum;
 727         sector_t offset = 0;
 728         int8_t etype, tmpetype;
 729         struct udf_inode_info *iinfo = UDF_I(inode);
 730         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 731         int lastblock = 0;
 732         bool isBeyondEOF = false;
 733         int ret = 0;
 734
 735         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 736         prev_epos.block = iinfo->i_location;
 737         prev_epos.bh = NULL;
 738         cur_epos = next_epos = prev_epos;
 739         b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
 740
 741         /* find the extent which contains the block we are looking for.
 742            alternate between laarr[0] and laarr[1] for locations of the
 743            current extent, and the previous extent */
 744         do {
 745                 if (prev_epos.bh != cur_epos.bh) {
 746                         brelse(prev_epos.bh);
 747                         get_bh(cur_epos.bh);
 748                         prev_epos.bh = cur_epos.bh;
 749                 }
 750                 if (cur_epos.bh != next_epos.bh) {
 751                         brelse(cur_epos.bh);
 752                         get_bh(next_epos.bh);
 753                         cur_epos.bh = next_epos.bh;
 754                 }
 755
 756                 lbcount += elen;
 757
 758                 prev_epos.block = cur_epos.block;
 759                 cur_epos.block = next_epos.block;
 760
 761                 prev_epos.offset = cur_epos.offset;
 762                 cur_epos.offset = next_epos.offset;
 763
 764                 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 1);
 765                 if (ret < 0) {
 766                         goto out_free;
 767                 } else if (ret == 0) {
 768                         isBeyondEOF = true;
 769                         break;
 770                 }
 771
 772                 c = !c;
 773
 774                 laarr[c].extLength = (etype << 30) | elen;
 775                 laarr[c].extLocation = eloc;
 776
 777                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 778                         pgoal = eloc.logicalBlockNum +
 779                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 780                                  inode->i_sb->s_blocksize_bits);
 781
 782                 count++;
 783         } while (lbcount + elen <= b_off);
 784
 785         b_off -= lbcount;
 786         offset = b_off >> inode->i_sb->s_blocksize_bits;
 787         /*
 788          * Move prev_epos and cur_epos into indirect extent if we are at
 789          * the pointer to it
 790          */
 791         ret = udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
 792         if (ret < 0)
 793                 goto out_free;
 794         ret = udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
 795         if (ret < 0)
 796                 goto out_free;
 797
 798         /* if the extent is allocated and recorded, return the block
 799            if the extent is not a multiple of the blocksize, round up */
 800
 801         if (!isBeyondEOF && etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 802                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 803                         elen = EXT_RECORDED_ALLOCATED |
 804                                 ((elen + inode->i_sb->s_blocksize - 1) &
 805                                  ~(inode->i_sb->s_blocksize - 1));
 806                         iinfo->i_lenExtents =
 807                                 ALIGN(iinfo->i_lenExtents,
 808                                       inode->i_sb->s_blocksize);
 809                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 810                 }
 811                 map->oflags = UDF_BLK_MAPPED;
 812                 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 813                 ret = 0;
 814                 goto out_free;
 815         }
 816
 817         /* Are we beyond EOF and preallocated extent? */
 818         if (isBeyondEOF) {
 819                 loff_t hole_len;
 820
 821                 if (count) {
 822                         if (c)
 823                                 laarr[0] = laarr[1];
 824                         startnum = 1;
 825                 } else {
 826                         /* Create a fake extent when there's not one */
 827                         memset(&laarr[0].extLocation, 0x00,
 828                                 sizeof(struct kernel_lb_addr));
 829                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 830                         /* Will udf_do_extend_file() create real extent from
 831                            a fake one? */
 832                         startnum = (offset > 0);
 833                 }
 834                 /* Create extents for the hole between EOF and offset */
 835                 hole_len = (loff_t)offset << inode->i_blkbits;
 836                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 837                 if (ret < 0)
 838                         goto out_free;
 839                 c = 0;
 840                 offset = 0;
 841                 count += ret;
 842                 /*
 843                  * Is there any real extent? - otherwise we overwrite the fake
 844                  * one...
 845                  */
 846                 if (count)
 847                         c = !c;
 848                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 849                         inode->i_sb->s_blocksize;
 850                 memset(&laarr[c].extLocation, 0x00,
 851                         sizeof(struct kernel_lb_addr));
 852                 count++;
 853                 endnum = c + 1;
 854                 lastblock = 1;
 855         } else {
 856                 endnum = startnum = ((count > 2) ? 2 : count);
 857
 858                 /* if the current extent is in position 0,
 859                    swap it with the previous */
 860                 if (!c && count != 1) {
 861                         laarr[2] = laarr[0];
 862                         laarr[0] = laarr[1];
 863                         laarr[1] = laarr[2];
 864                         c = 1;
 865                 }
 866
 867                 /* if the current block is located in an extent,
 868                    read the next extent */
 869                 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 0);
 870                 if (ret > 0) {
 871                         laarr[c + 1].extLength = (etype << 30) | elen;
 872                         laarr[c + 1].extLocation = eloc;
 873                         count++;
 874                         startnum++;
 875                         endnum++;
 876                 } else if (ret == 0)
 877                         lastblock = 1;
 878                 else
 879                         goto out_free;
 880         }
 881
 882         /* if the current extent is not recorded but allocated, get the
 883          * block in the extent corresponding to the requested block */
 884         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 885                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 886         else { /* otherwise, allocate a new block */
 887                 if (iinfo->i_next_alloc_block == map->lblk)
 888                         goal = iinfo->i_next_alloc_goal;
 889
 890                 if (!goal) {
 891                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 892                                 goal = iinfo->i_location.logicalBlockNum + 1;
 893                 }
 894
 895                 newblocknum = udf_new_block(inode->i_sb, inode,
 896                                 iinfo->i_location.partitionReferenceNum,
 897                                 goal, &ret);
 898                 if (!newblocknum)
 899                         goto out_free;
 900                 if (isBeyondEOF)
 901                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 902         }
 903
 904         /* if the extent the requsted block is located in contains multiple
 905          * blocks, split the extent into at most three extents. blocks prior
 906          * to requested block, requested block, and blocks after requested
 907          * block */
 908         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 909
 910         if (!(map->iflags & UDF_MAP_NOPREALLOC))
 911                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 912
 913         /* merge any continuous blocks in laarr */
 914         udf_merge_extents(inode, laarr, &endnum);
 915
 916         /* write back the new extents, inserting new extents if the new number
 917          * of extents is greater than the old number, and deleting extents if
 918          * the new number of extents is less than the old number */
 919         ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 920         if (ret < 0)
 921                 goto out_free;
 922
 923         map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
 924                                 iinfo->i_location.partitionReferenceNum, 0);
 925         if (!map->pblk) {
 926                 ret = -EFSCORRUPTED;
 927                 goto out_free;
 928         }
 929         map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
 930         iinfo->i_next_alloc_block = map->lblk + 1;
 931         iinfo->i_next_alloc_goal = newblocknum + 1;
 932         inode_set_ctime_current(inode);
 933
 934         if (IS_SYNC(inode))
 935                 udf_sync_inode(inode);
 936         else
 937                 mark_inode_dirty(inode);
 938         ret = 0;
 939 out_free:
 940         brelse(prev_epos.bh);
 941         brelse(cur_epos.bh);
 942         brelse(next_epos.bh);
 943         return ret;
 944 }
 945
 946 static void udf_split_extents(struct inode *inode, int *c, int offset,
 947                                udf_pblk_t newblocknum,
 948                                struct kernel_long_ad *laarr, int *endnum)
 949 {
 950         unsigned long blocksize = inode->i_sb->s_blocksize;
 951         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 952
 953         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 954             (laarr[*c].extLength >> 30) ==
 955                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 956                 int curr = *c;
 957                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 958                             blocksize - 1) >> blocksize_bits;
 959                 int8_t etype = (laarr[curr].extLength >> 30);
 960
 961                 if (blen == 1)
 962                         ;
 963                 else if (!offset || blen == offset + 1) {
 964                         laarr[curr + 2] = laarr[curr + 1];
 965                         laarr[curr + 1] = laarr[curr];
 966                 } else {
 967                         laarr[curr + 3] = laarr[curr + 1];
 968                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 969                 }
 970
 971                 if (offset) {
 972                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 973                                 udf_free_blocks(inode->i_sb, inode,
 974                                                 &laarr[curr].extLocation,
 975                                                 0, offset);
 976                                 laarr[curr].extLength =
 977                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 978                                         (offset << blocksize_bits);
 979                                 laarr[curr].extLocation.logicalBlockNum = 0;
 980                                 laarr[curr].extLocation.
 981                                                 partitionReferenceNum = 0;
 982                         } else
 983                                 laarr[curr].extLength = (etype << 30) |
 984                                         (offset << blocksize_bits);
 985                         curr++;
 986                         (*c)++;
 987                         (*endnum)++;
 988                 }
 989
 990                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 991                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 992                         laarr[curr].extLocation.partitionReferenceNum =
 993                                 UDF_I(inode)->i_location.partitionReferenceNum;
 994                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 995                         blocksize;
 996                 curr++;
 997
 998                 if (blen != offset + 1) {
 999                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
1000                                 laarr[curr].extLocation.logicalBlockNum +=
1001                                                                 offset + 1;
1002                         laarr[curr].extLength = (etype << 30) |
1003                                 ((blen - (offset + 1)) << blocksize_bits);
1004                         curr++;
1005                         (*endnum)++;
1006                 }
1007         }
1008 }
1009
1010 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
1011                                  struct kernel_long_ad *laarr,
1012                                  int *endnum)
1013 {
1014         int start, length = 0, currlength = 0, i;
1015
1016         if (*endnum >= (c + 1)) {
1017                 if (!lastblock)
1018                         return;
1019                 else
1020                         start = c;
1021         } else {
1022                 if ((laarr[c + 1].extLength >> 30) ==
1023                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1024                         start = c + 1;
1025                         length = currlength =
1026                                 (((laarr[c + 1].extLength &
1027                                         UDF_EXTENT_LENGTH_MASK) +
1028                                 inode->i_sb->s_blocksize - 1) >>
1029                                 inode->i_sb->s_blocksize_bits);
1030                 } else
1031                         start = c;
1032         }
1033
1034         for (i = start + 1; i <= *endnum; i++) {
1035                 if (i == *endnum) {
1036                         if (lastblock)
1037                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1038                 } else if ((laarr[i].extLength >> 30) ==
1039                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1040                         length += (((laarr[i].extLength &
1041                                                 UDF_EXTENT_LENGTH_MASK) +
1042                                     inode->i_sb->s_blocksize - 1) >>
1043                                     inode->i_sb->s_blocksize_bits);
1044                 } else
1045                         break;
1046         }
1047
1048         if (length) {
1049                 int next = laarr[start].extLocation.logicalBlockNum +
1050                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1051                           inode->i_sb->s_blocksize - 1) >>
1052                           inode->i_sb->s_blocksize_bits);
1053                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1054                                 laarr[start].extLocation.partitionReferenceNum,
1055                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1056                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1057                                 currlength);
1058                 if (numalloc)   {
1059                         if (start == (c + 1))
1060                                 laarr[start].extLength +=
1061                                         (numalloc <<
1062                                          inode->i_sb->s_blocksize_bits);
1063                         else {
1064                                 memmove(&laarr[c + 2], &laarr[c + 1],
1065                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1066                                 (*endnum)++;
1067                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1068                                 laarr[c + 1].extLocation.partitionReferenceNum =
1069                                         laarr[c].extLocation.
1070                                                         partitionReferenceNum;
1071                                 laarr[c + 1].extLength =
1072                                         EXT_NOT_RECORDED_ALLOCATED |
1073                                         (numalloc <<
1074                                          inode->i_sb->s_blocksize_bits);
1075                                 start = c + 1;
1076                         }
1077
1078                         for (i = start + 1; numalloc && i < *endnum; i++) {
1079                                 int elen = ((laarr[i].extLength &
1080                                                 UDF_EXTENT_LENGTH_MASK) +
1081                                             inode->i_sb->s_blocksize - 1) >>
1082                                             inode->i_sb->s_blocksize_bits;
1083
1084                                 if (elen > numalloc) {
1085                                         laarr[i].extLength -=
1086                                                 (numalloc <<
1087                                                  inode->i_sb->s_blocksize_bits);
1088                                         numalloc = 0;
1089                                 } else {
1090                                         numalloc -= elen;
1091                                         if (*endnum > (i + 1))
1092                                                 memmove(&laarr[i],
1093                                                         &laarr[i + 1],
1094                                                         sizeof(struct long_ad) *
1095                                                         (*endnum - (i + 1)));
1096                                         i--;
1097                                         (*endnum)--;
1098                                 }
1099                         }
1100                         UDF_I(inode)->i_lenExtents +=
1101                                 numalloc << inode->i_sb->s_blocksize_bits;
1102                 }
1103         }
1104 }
1105
1106 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1107                               int *endnum)
1108 {
1109         int i;
1110         unsigned long blocksize = inode->i_sb->s_blocksize;
1111         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1112
1113         for (i = 0; i < (*endnum - 1); i++) {
1114                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1115                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1116
1117                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1118                         (((li->extLength >> 30) ==
1119                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1120                         ((lip1->extLocation.logicalBlockNum -
1121                           li->extLocation.logicalBlockNum) ==
1122                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1123                         blocksize - 1) >> blocksize_bits)))) {
1124
1125                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1126                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1127                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1128                                 li->extLength = lip1->extLength +
1129                                         (((li->extLength &
1130                                                 UDF_EXTENT_LENGTH_MASK) +
1131                                          blocksize - 1) & ~(blocksize - 1));
1132                                 if (*endnum > (i + 2))
1133                                         memmove(&laarr[i + 1], &laarr[i + 2],
1134                                                 sizeof(struct long_ad) *
1135                                                 (*endnum - (i + 2)));
1136                                 i--;
1137                                 (*endnum)--;
1138                         }
1139                 } else if (((li->extLength >> 30) ==
1140                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1141                            ((lip1->extLength >> 30) ==
1142                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1143                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1144                                         ((li->extLength &
1145                                           UDF_EXTENT_LENGTH_MASK) +
1146                                          blocksize - 1) >> blocksize_bits);
1147                         li->extLocation.logicalBlockNum = 0;
1148                         li->extLocation.partitionReferenceNum = 0;
1149
1150                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1151                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1152                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1153                                 lip1->extLength = (lip1->extLength -
1154                                                    (li->extLength &
1155                                                    UDF_EXTENT_LENGTH_MASK) +
1156                                                    UDF_EXTENT_LENGTH_MASK) &
1157                                                    ~(blocksize - 1);
1158                                 li->extLength = (li->extLength &
1159                                                  UDF_EXTENT_FLAG_MASK) +
1160                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1161                                                 blocksize;
1162                         } else {
1163                                 li->extLength = lip1->extLength +
1164                                         (((li->extLength &
1165                                                 UDF_EXTENT_LENGTH_MASK) +
1166                                           blocksize - 1) & ~(blocksize - 1));
1167                                 if (*endnum > (i + 2))
1168                                         memmove(&laarr[i + 1], &laarr[i + 2],
1169                                                 sizeof(struct long_ad) *
1170                                                 (*endnum - (i + 2)));
1171                                 i--;
1172                                 (*endnum)--;
1173                         }
1174                 } else if ((li->extLength >> 30) ==
1175                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1176                         udf_free_blocks(inode->i_sb, inode,
1177                                         &li->extLocation, 0,
1178                                         ((li->extLength &
1179                                                 UDF_EXTENT_LENGTH_MASK) +
1180                                          blocksize - 1) >> blocksize_bits);
1181                         li->extLocation.logicalBlockNum = 0;
1182                         li->extLocation.partitionReferenceNum = 0;
1183                         li->extLength = (li->extLength &
1184                                                 UDF_EXTENT_LENGTH_MASK) |
1185                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1186                 }
1187         }
1188 }
1189
1190 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1191                               int startnum, int endnum,
1192                               struct extent_position *epos)
1193 {
1194         int start = 0, i;
1195         struct kernel_lb_addr tmploc;
1196         uint32_t tmplen;
1197         int8_t tmpetype;
1198         int err;
1199
1200         if (startnum > endnum) {
1201                 for (i = 0; i < (startnum - endnum); i++)
1202                         udf_delete_aext(inode, *epos);
1203         } else if (startnum < endnum) {
1204                 for (i = 0; i < (endnum - startnum); i++) {
1205                         err = udf_insert_aext(inode, *epos,
1206                                               laarr[i].extLocation,
1207                                               laarr[i].extLength);
1208                         /*
1209                          * If we fail here, we are likely corrupting the extent
1210                          * list and leaking blocks. At least stop early to
1211                          * limit the damage.
1212                          */
1213                         if (err < 0)
1214                                 return err;
1215                         err = udf_next_aext(inode, epos, &laarr[i].extLocation,
1216                                       &laarr[i].extLength, &tmpetype, 1);
1217                         if (err < 0)
1218                                 return err;
1219                         start++;
1220                 }
1221         }
1222
1223         for (i = start; i < endnum; i++) {
1224                 err = udf_next_aext(inode, epos, &tmploc, &tmplen, &tmpetype, 0);
1225                 if (err < 0)
1226                         return err;
1227
1228                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1229                                laarr[i].extLength, 1);
1230         }
1231         return 0;
1232 }
1233
1234 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1235                               int create, int *err)
1236 {
1237         struct buffer_head *bh = NULL;
1238         struct udf_map_rq map = {
1239                 .lblk = block,
1240                 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1241         };
1242
1243         *err = udf_map_block(inode, &map);
1244         if (*err || !(map.oflags & UDF_BLK_MAPPED))
1245                 return NULL;
1246
1247         bh = sb_getblk(inode->i_sb, map.pblk);
1248         if (!bh) {
1249                 *err = -ENOMEM;
1250                 return NULL;
1251         }
1252         if (map.oflags & UDF_BLK_NEW) {
1253                 lock_buffer(bh);
1254                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1255                 set_buffer_uptodate(bh);
1256                 unlock_buffer(bh);
1257                 mark_buffer_dirty_inode(bh, inode);
1258                 return bh;
1259         }
1260
1261         if (bh_read(bh, 0) >= 0)
1262                 return bh;
1263
1264         brelse(bh);
1265         *err = -EIO;
1266         return NULL;
1267 }
1268
1269 int udf_setsize(struct inode *inode, loff_t newsize)
1270 {
1271         int err = 0;
1272         struct udf_inode_info *iinfo;
1273         unsigned int bsize = i_blocksize(inode);
1274
1275         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1276               S_ISLNK(inode->i_mode)))
1277                 return -EINVAL;
1278
1279         iinfo = UDF_I(inode);
1280         if (newsize > inode->i_size) {
1281                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1282                         if (bsize >=
1283                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1284                                 down_write(&iinfo->i_data_sem);
1285                                 iinfo->i_lenAlloc = newsize;
1286                                 up_write(&iinfo->i_data_sem);
1287                                 goto set_size;
1288                         }
1289                         err = udf_expand_file_adinicb(inode);
1290                         if (err)
1291                                 return err;
1292                 }
1293                 err = udf_extend_file(inode, newsize);
1294                 if (err)
1295                         return err;
1296 set_size:
1297                 truncate_setsize(inode, newsize);
1298         } else {
1299                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1300                         down_write(&iinfo->i_data_sem);
1301                         udf_clear_extent_cache(inode);
1302                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1303                                0x00, bsize - newsize -
1304                                udf_file_entry_alloc_offset(inode));
1305                         iinfo->i_lenAlloc = newsize;
1306                         truncate_setsize(inode, newsize);
1307                         up_write(&iinfo->i_data_sem);
1308                         goto update_time;
1309                 }
1310                 err = block_truncate_page(inode->i_mapping, newsize,
1311                                           udf_get_block);
1312                 if (err)
1313                         return err;
1314                 truncate_setsize(inode, newsize);
1315                 down_write(&iinfo->i_data_sem);
1316                 udf_clear_extent_cache(inode);
1317                 err = udf_truncate_extents(inode);
1318                 up_write(&iinfo->i_data_sem);
1319                 if (err)
1320                         return err;
1321         }
1322 update_time:
1323         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1324         if (IS_SYNC(inode))
1325                 udf_sync_inode(inode);
1326         else
1327                 mark_inode_dirty(inode);
1328         return err;
1329 }
1330
1331 /*
1332  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1333  * arbitrary - just that we hopefully don't limit any real use of rewritten
1334  * inode on write-once media but avoid looping for too long on corrupted media.
1335  */
1336 #define UDF_MAX_ICB_NESTING 1024
1337
1338 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1339 {
1340         struct buffer_head *bh = NULL;
1341         struct fileEntry *fe;
1342         struct extendedFileEntry *efe;
1343         uint16_t ident;
1344         struct udf_inode_info *iinfo = UDF_I(inode);
1345         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1346         struct kernel_lb_addr *iloc = &iinfo->i_location;
1347         unsigned int link_count;
1348         unsigned int indirections = 0;
1349         int bs = inode->i_sb->s_blocksize;
1350         int ret = -EIO;
1351         uint32_t uid, gid;
1352         struct timespec64 ts;
1353
1354 reread:
1355         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1356                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1357                           iloc->partitionReferenceNum, sbi->s_partitions);
1358                 return -EIO;
1359         }
1360
1361         if (iloc->logicalBlockNum >=
1362             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1363                 udf_debug("block=%u, partition=%u out of range\n",
1364                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1365                 return -EIO;
1366         }
1367
1368         /*
1369          * Set defaults, but the inode is still incomplete!
1370          * Note: get_new_inode() sets the following on a new inode:
1371          *      i_sb = sb
1372          *      i_no = ino
1373          *      i_flags = sb->s_flags
1374          *      i_state = 0
1375          * clean_inode(): zero fills and sets
1376          *      i_count = 1
1377          *      i_nlink = 1
1378          *      i_op = NULL;
1379          */
1380         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1381         if (!bh) {
1382                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1383                 return -EIO;
1384         }
1385
1386         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1387             ident != TAG_IDENT_USE) {
1388                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1389                         inode->i_ino, ident);
1390                 goto out;
1391         }
1392
1393         fe = (struct fileEntry *)bh->b_data;
1394         efe = (struct extendedFileEntry *)bh->b_data;
1395
1396         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1397                 struct buffer_head *ibh;
1398
1399                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1400                 if (ident == TAG_IDENT_IE && ibh) {
1401                         struct kernel_lb_addr loc;
1402                         struct indirectEntry *ie;
1403
1404                         ie = (struct indirectEntry *)ibh->b_data;
1405                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1406
1407                         if (ie->indirectICB.extLength) {
1408                                 brelse(ibh);
1409                                 memcpy(&iinfo->i_location, &loc,
1410                                        sizeof(struct kernel_lb_addr));
1411                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1412                                         udf_err(inode->i_sb,
1413                                                 "too many ICBs in ICB hierarchy"
1414                                                 " (max %d supported)\n",
1415                                                 UDF_MAX_ICB_NESTING);
1416                                         goto out;
1417                                 }
1418                                 brelse(bh);
1419                                 goto reread;
1420                         }
1421                 }
1422                 brelse(ibh);
1423         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1424                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1425                         le16_to_cpu(fe->icbTag.strategyType));
1426                 goto out;
1427         }
1428         if (fe->icbTag.strategyType == cpu_to_le16(4))
1429                 iinfo->i_strat4096 = 0;
1430         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1431                 iinfo->i_strat4096 = 1;
1432
1433         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1434                                                         ICBTAG_FLAG_AD_MASK;
1435         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1436             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1437             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1438                 ret = -EIO;
1439                 goto out;
1440         }
1441         iinfo->i_hidden = hidden_inode;
1442         iinfo->i_unique = 0;
1443         iinfo->i_lenEAttr = 0;
1444         iinfo->i_lenExtents = 0;
1445         iinfo->i_lenAlloc = 0;
1446         iinfo->i_next_alloc_block = 0;
1447         iinfo->i_next_alloc_goal = 0;
1448         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1449                 iinfo->i_efe = 1;
1450                 iinfo->i_use = 0;
1451                 ret = udf_alloc_i_data(inode, bs -
1452                                         sizeof(struct extendedFileEntry));
1453                 if (ret)
1454                         goto out;
1455                 memcpy(iinfo->i_data,
1456                        bh->b_data + sizeof(struct extendedFileEntry),
1457                        bs - sizeof(struct extendedFileEntry));
1458         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1459                 iinfo->i_efe = 0;
1460                 iinfo->i_use = 0;
1461                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1462                 if (ret)
1463                         goto out;
1464                 memcpy(iinfo->i_data,
1465                        bh->b_data + sizeof(struct fileEntry),
1466                        bs - sizeof(struct fileEntry));
1467         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1468                 iinfo->i_efe = 0;
1469                 iinfo->i_use = 1;
1470                 iinfo->i_lenAlloc = le32_to_cpu(
1471                                 ((struct unallocSpaceEntry *)bh->b_data)->
1472                                  lengthAllocDescs);
1473                 ret = udf_alloc_i_data(inode, bs -
1474                                         sizeof(struct unallocSpaceEntry));
1475                 if (ret)
1476                         goto out;
1477                 memcpy(iinfo->i_data,
1478                        bh->b_data + sizeof(struct unallocSpaceEntry),
1479                        bs - sizeof(struct unallocSpaceEntry));
1480                 return 0;
1481         }
1482
1483         ret = -EIO;
1484         read_lock(&sbi->s_cred_lock);
1485         uid = le32_to_cpu(fe->uid);
1486         if (uid == UDF_INVALID_ID ||
1487             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1488                 inode->i_uid = sbi->s_uid;
1489         else
1490                 i_uid_write(inode, uid);
1491
1492         gid = le32_to_cpu(fe->gid);
1493         if (gid == UDF_INVALID_ID ||
1494             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1495                 inode->i_gid = sbi->s_gid;
1496         else
1497                 i_gid_write(inode, gid);
1498
1499         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1500                         sbi->s_fmode != UDF_INVALID_MODE)
1501                 inode->i_mode = sbi->s_fmode;
1502         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1503                         sbi->s_dmode != UDF_INVALID_MODE)
1504                 inode->i_mode = sbi->s_dmode;
1505         else
1506                 inode->i_mode = udf_convert_permissions(fe);
1507         inode->i_mode &= ~sbi->s_umask;
1508         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1509
1510         read_unlock(&sbi->s_cred_lock);
1511
1512         link_count = le16_to_cpu(fe->fileLinkCount);
1513         if (!link_count) {
1514                 if (!hidden_inode) {
1515                         ret = -ESTALE;
1516                         goto out;
1517                 }
1518                 link_count = 1;
1519         }
1520         set_nlink(inode, link_count);
1521
1522         inode->i_size = le64_to_cpu(fe->informationLength);
1523         iinfo->i_lenExtents = inode->i_size;
1524
1525         if (iinfo->i_efe == 0) {
1526                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1527                         (inode->i_sb->s_blocksize_bits - 9);
1528
1529                 udf_disk_stamp_to_time(&ts, fe->accessTime);
1530                 inode_set_atime_to_ts(inode, ts);
1531                 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1532                 inode_set_mtime_to_ts(inode, ts);
1533                 udf_disk_stamp_to_time(&ts, fe->attrTime);
1534                 inode_set_ctime_to_ts(inode, ts);
1535
1536                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1537                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1538                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1539                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1540                 iinfo->i_streamdir = 0;
1541                 iinfo->i_lenStreams = 0;
1542         } else {
1543                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1544                     (inode->i_sb->s_blocksize_bits - 9);
1545
1546                 udf_disk_stamp_to_time(&ts, efe->accessTime);
1547                 inode_set_atime_to_ts(inode, ts);
1548                 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1549                 inode_set_mtime_to_ts(inode, ts);
1550                 udf_disk_stamp_to_time(&ts, efe->attrTime);
1551                 inode_set_ctime_to_ts(inode, ts);
1552                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1553
1554                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1555                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1556                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1557                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1558
1559                 /* Named streams */
1560                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1561                 iinfo->i_locStreamdir =
1562                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1563                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1564                 if (iinfo->i_lenStreams >= inode->i_size)
1565                         iinfo->i_lenStreams -= inode->i_size;
1566                 else
1567                         iinfo->i_lenStreams = 0;
1568         }
1569         inode->i_generation = iinfo->i_unique;
1570
1571         /*
1572          * Sanity check length of allocation descriptors and extended attrs to
1573          * avoid integer overflows
1574          */
1575         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1576                 goto out;
1577         /* Now do exact checks */
1578         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1579                 goto out;
1580         /* Sanity checks for files in ICB so that we don't get confused later */
1581         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1582                 /*
1583                  * For file in ICB data is stored in allocation descriptor
1584                  * so sizes should match
1585                  */
1586                 if (iinfo->i_lenAlloc != inode->i_size)
1587                         goto out;
1588                 /* File in ICB has to fit in there... */
1589                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1590                         goto out;
1591         }
1592
1593         switch (fe->icbTag.fileType) {
1594         case ICBTAG_FILE_TYPE_DIRECTORY:
1595                 inode->i_op = &udf_dir_inode_operations;
1596                 inode->i_fop = &udf_dir_operations;
1597                 inode->i_mode |= S_IFDIR;
1598                 inc_nlink(inode);
1599                 break;
1600         case ICBTAG_FILE_TYPE_REALTIME:
1601         case ICBTAG_FILE_TYPE_REGULAR:
1602         case ICBTAG_FILE_TYPE_UNDEF:
1603         case ICBTAG_FILE_TYPE_VAT20:
1604                 inode->i_data.a_ops = &udf_aops;
1605                 inode->i_op = &udf_file_inode_operations;
1606                 inode->i_fop = &udf_file_operations;
1607                 inode->i_mode |= S_IFREG;
1608                 break;
1609         case ICBTAG_FILE_TYPE_BLOCK:
1610                 inode->i_mode |= S_IFBLK;
1611                 break;
1612         case ICBTAG_FILE_TYPE_CHAR:
1613                 inode->i_mode |= S_IFCHR;
1614                 break;
1615         case ICBTAG_FILE_TYPE_FIFO:
1616                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1617                 break;
1618         case ICBTAG_FILE_TYPE_SOCKET:
1619                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1620                 break;
1621         case ICBTAG_FILE_TYPE_SYMLINK:
1622                 inode->i_data.a_ops = &udf_symlink_aops;
1623                 inode->i_op = &udf_symlink_inode_operations;
1624                 inode_nohighmem(inode);
1625                 inode->i_mode = S_IFLNK | 0777;
1626                 break;
1627         case ICBTAG_FILE_TYPE_MAIN:
1628                 udf_debug("METADATA FILE-----\n");
1629                 break;
1630         case ICBTAG_FILE_TYPE_MIRROR:
1631                 udf_debug("METADATA MIRROR FILE-----\n");
1632                 break;
1633         case ICBTAG_FILE_TYPE_BITMAP:
1634                 udf_debug("METADATA BITMAP FILE-----\n");
1635                 break;
1636         default:
1637                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1638                         inode->i_ino, fe->icbTag.fileType);
1639                 goto out;
1640         }
1641         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1642                 struct deviceSpec *dsea =
1643                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1644                 if (dsea) {
1645                         init_special_inode(inode, inode->i_mode,
1646                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1647                                       le32_to_cpu(dsea->minorDeviceIdent)));
1648                         /* Developer ID ??? */
1649                 } else
1650                         goto out;
1651         }
1652         ret = 0;
1653 out:
1654         brelse(bh);
1655         return ret;
1656 }
1657
1658 static int udf_alloc_i_data(struct inode *inode, size_t size)
1659 {
1660         struct udf_inode_info *iinfo = UDF_I(inode);
1661         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1662         if (!iinfo->i_data)
1663                 return -ENOMEM;
1664         return 0;
1665 }
1666
1667 static umode_t udf_convert_permissions(struct fileEntry *fe)
1668 {
1669         umode_t mode;
1670         uint32_t permissions;
1671         uint32_t flags;
1672
1673         permissions = le32_to_cpu(fe->permissions);
1674         flags = le16_to_cpu(fe->icbTag.flags);
1675
1676         mode =  ((permissions) & 0007) |
1677                 ((permissions >> 2) & 0070) |
1678                 ((permissions >> 4) & 0700) |
1679                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1680                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1681                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1682
1683         return mode;
1684 }
1685
1686 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1687 {
1688         struct udf_inode_info *iinfo = UDF_I(inode);
1689
1690         /*
1691          * UDF 2.01 sec. 3.3.3.3 Note 2:
1692          * In Unix, delete permission tracks write
1693          */
1694         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1695         if (mode & 0200)
1696                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1697         if (mode & 0020)
1698                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1699         if (mode & 0002)
1700                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1701 }
1702
1703 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1704 {
1705         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1706 }
1707
1708 static int udf_sync_inode(struct inode *inode)
1709 {
1710         return udf_update_inode(inode, 1);
1711 }
1712
1713 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1714 {
1715         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1716             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1717              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1718                 iinfo->i_crtime = time;
1719 }
1720
1721 static int udf_update_inode(struct inode *inode, int do_sync)
1722 {
1723         struct buffer_head *bh = NULL;
1724         struct fileEntry *fe;
1725         struct extendedFileEntry *efe;
1726         uint64_t lb_recorded;
1727         uint32_t udfperms;
1728         uint16_t icbflags;
1729         uint16_t crclen;
1730         int err = 0;
1731         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1732         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1733         struct udf_inode_info *iinfo = UDF_I(inode);
1734
1735         bh = sb_getblk(inode->i_sb,
1736                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1737         if (!bh) {
1738                 udf_debug("getblk failure\n");
1739                 return -EIO;
1740         }
1741
1742         lock_buffer(bh);
1743         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1744         fe = (struct fileEntry *)bh->b_data;
1745         efe = (struct extendedFileEntry *)bh->b_data;
1746
1747         if (iinfo->i_use) {
1748                 struct unallocSpaceEntry *use =
1749                         (struct unallocSpaceEntry *)bh->b_data;
1750
1751                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1752                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1753                        iinfo->i_data, inode->i_sb->s_blocksize -
1754                                         sizeof(struct unallocSpaceEntry));
1755                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1756                 crclen = sizeof(struct unallocSpaceEntry);
1757
1758                 goto finish;
1759         }
1760
1761         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1762                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1763         else
1764                 fe->uid = cpu_to_le32(i_uid_read(inode));
1765
1766         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1767                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1768         else
1769                 fe->gid = cpu_to_le32(i_gid_read(inode));
1770
1771         udfperms = ((inode->i_mode & 0007)) |
1772                    ((inode->i_mode & 0070) << 2) |
1773                    ((inode->i_mode & 0700) << 4);
1774
1775         udfperms |= iinfo->i_extraPerms;
1776         fe->permissions = cpu_to_le32(udfperms);
1777
1778         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1779                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1780         else {
1781                 if (iinfo->i_hidden)
1782                         fe->fileLinkCount = cpu_to_le16(0);
1783                 else
1784                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1785         }
1786
1787         fe->informationLength = cpu_to_le64(inode->i_size);
1788
1789         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1790                 struct regid *eid;
1791                 struct deviceSpec *dsea =
1792                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1793                 if (!dsea) {
1794                         dsea = (struct deviceSpec *)
1795                                 udf_add_extendedattr(inode,
1796                                                      sizeof(struct deviceSpec) +
1797                                                      sizeof(struct regid), 12, 0x3);
1798                         dsea->attrType = cpu_to_le32(12);
1799                         dsea->attrSubtype = 1;
1800                         dsea->attrLength = cpu_to_le32(
1801                                                 sizeof(struct deviceSpec) +
1802                                                 sizeof(struct regid));
1803                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1804                 }
1805                 eid = (struct regid *)dsea->impUse;
1806                 memset(eid, 0, sizeof(*eid));
1807                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1808                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1809                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1810                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1811                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1812         }
1813
1814         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1815                 lb_recorded = 0; /* No extents => no blocks! */
1816         else
1817                 lb_recorded =
1818                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1819                         (blocksize_bits - 9);
1820
1821         if (iinfo->i_efe == 0) {
1822                 memcpy(bh->b_data + sizeof(struct fileEntry),
1823                        iinfo->i_data,
1824                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1825                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1826
1827                 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1828                 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
1829                 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1830                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1831                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1832                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1833                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1834                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1835                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1836                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1837                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1838                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1839                 crclen = sizeof(struct fileEntry);
1840         } else {
1841                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1842                        iinfo->i_data,
1843                        inode->i_sb->s_blocksize -
1844                                         sizeof(struct extendedFileEntry));
1845                 efe->objectSize =
1846                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1847                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1848
1849                 if (iinfo->i_streamdir) {
1850                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1851
1852                         icb_lad->extLocation =
1853                                 cpu_to_lelb(iinfo->i_locStreamdir);
1854                         icb_lad->extLength =
1855                                 cpu_to_le32(inode->i_sb->s_blocksize);
1856                 }
1857
1858                 udf_adjust_time(iinfo, inode_get_atime(inode));
1859                 udf_adjust_time(iinfo, inode_get_mtime(inode));
1860                 udf_adjust_time(iinfo, inode_get_ctime(inode));
1861
1862                 udf_time_to_disk_stamp(&efe->accessTime,
1863                                        inode_get_atime(inode));
1864                 udf_time_to_disk_stamp(&efe->modificationTime,
1865                                        inode_get_mtime(inode));
1866                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1867                 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1868
1869                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1870                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1871                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1872                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1873                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1874                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1875                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1876                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1877                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1878                 crclen = sizeof(struct extendedFileEntry);
1879         }
1880
1881 finish:
1882         if (iinfo->i_strat4096) {
1883                 fe->icbTag.strategyType = cpu_to_le16(4096);
1884                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1885                 fe->icbTag.numEntries = cpu_to_le16(2);
1886         } else {
1887                 fe->icbTag.strategyType = cpu_to_le16(4);
1888                 fe->icbTag.numEntries = cpu_to_le16(1);
1889         }
1890
1891         if (iinfo->i_use)
1892                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1893         else if (S_ISDIR(inode->i_mode))
1894                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1895         else if (S_ISREG(inode->i_mode))
1896                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1897         else if (S_ISLNK(inode->i_mode))
1898                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1899         else if (S_ISBLK(inode->i_mode))
1900                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1901         else if (S_ISCHR(inode->i_mode))
1902                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1903         else if (S_ISFIFO(inode->i_mode))
1904                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1905         else if (S_ISSOCK(inode->i_mode))
1906                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1907
1908         icbflags =      iinfo->i_alloc_type |
1909                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1910                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1911                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1912                         (le16_to_cpu(fe->icbTag.flags) &
1913                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1914                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1915
1916         fe->icbTag.flags = cpu_to_le16(icbflags);
1917         if (sbi->s_udfrev >= 0x0200)
1918                 fe->descTag.descVersion = cpu_to_le16(3);
1919         else
1920                 fe->descTag.descVersion = cpu_to_le16(2);
1921         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1922         fe->descTag.tagLocation = cpu_to_le32(
1923                                         iinfo->i_location.logicalBlockNum);
1924         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1925         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1926         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1927                                                   crclen));
1928         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1929
1930         set_buffer_uptodate(bh);
1931         unlock_buffer(bh);
1932
1933         /* write the data blocks */
1934         mark_buffer_dirty(bh);
1935         if (do_sync) {
1936                 sync_dirty_buffer(bh);
1937                 if (buffer_write_io_error(bh)) {
1938                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1939                                  inode->i_ino);
1940                         err = -EIO;
1941                 }
1942         }
1943         brelse(bh);
1944
1945         return err;
1946 }
1947
1948 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1949                          bool hidden_inode)
1950 {
1951         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1952         struct inode *inode = iget_locked(sb, block);
1953         int err;
1954
1955         if (!inode)
1956                 return ERR_PTR(-ENOMEM);
1957
1958         if (!(inode->i_state & I_NEW)) {
1959                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1960                         iput(inode);
1961                         return ERR_PTR(-EFSCORRUPTED);
1962                 }
1963                 return inode;
1964         }
1965
1966         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1967         err = udf_read_inode(inode, hidden_inode);
1968         if (err < 0) {
1969                 iget_failed(inode);
1970                 return ERR_PTR(err);
1971         }
1972         unlock_new_inode(inode);
1973
1974         return inode;
1975 }
1976
1977 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1978                             struct extent_position *epos)
1979 {
1980         struct super_block *sb = inode->i_sb;
1981         struct buffer_head *bh;
1982         struct allocExtDesc *aed;
1983         struct extent_position nepos;
1984         struct kernel_lb_addr neloc;
1985         int ver, adsize;
1986         int err = 0;
1987
1988         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1989                 adsize = sizeof(struct short_ad);
1990         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1991                 adsize = sizeof(struct long_ad);
1992         else
1993                 return -EIO;
1994
1995         neloc.logicalBlockNum = block;
1996         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1997
1998         bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1999         if (!bh)
2000                 return -EIO;
2001         lock_buffer(bh);
2002         memset(bh->b_data, 0x00, sb->s_blocksize);
2003         set_buffer_uptodate(bh);
2004         unlock_buffer(bh);
2005         mark_buffer_dirty_inode(bh, inode);
2006
2007         aed = (struct allocExtDesc *)(bh->b_data);
2008         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
2009                 aed->previousAllocExtLocation =
2010                                 cpu_to_le32(epos->block.logicalBlockNum);
2011         }
2012         aed->lengthAllocDescs = cpu_to_le32(0);
2013         if (UDF_SB(sb)->s_udfrev >= 0x0200)
2014                 ver = 3;
2015         else
2016                 ver = 2;
2017         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
2018                     sizeof(struct tag));
2019
2020         nepos.block = neloc;
2021         nepos.offset = sizeof(struct allocExtDesc);
2022         nepos.bh = bh;
2023
2024         /*
2025          * Do we have to copy current last extent to make space for indirect
2026          * one?
2027          */
2028         if (epos->offset + adsize > sb->s_blocksize) {
2029                 struct kernel_lb_addr cp_loc;
2030                 uint32_t cp_len;
2031                 int8_t cp_type;
2032
2033                 epos->offset -= adsize;
2034                 err = udf_current_aext(inode, epos, &cp_loc, &cp_len, &cp_type, 0);
2035                 if (err <= 0)
2036                         goto err_out;
2037                 cp_len |= ((uint32_t)cp_type) << 30;
2038
2039                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2040                 udf_write_aext(inode, epos, &nepos.block,
2041                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2042         } else {
2043                 __udf_add_aext(inode, epos, &nepos.block,
2044                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2045         }
2046
2047         brelse(epos->bh);
2048         *epos = nepos;
2049
2050         return 0;
2051 err_out:
2052         brelse(bh);
2053         return err;
2054 }
2055
2056 /*
2057  * Append extent at the given position - should be the first free one in inode
2058  * / indirect extent. This function assumes there is enough space in the inode
2059  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2060  */
2061 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2062                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2063 {
2064         struct udf_inode_info *iinfo = UDF_I(inode);
2065         struct allocExtDesc *aed;
2066         int adsize;
2067
2068         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2069                 adsize = sizeof(struct short_ad);
2070         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2071                 adsize = sizeof(struct long_ad);
2072         else
2073                 return -EIO;
2074
2075         if (!epos->bh) {
2076                 WARN_ON(iinfo->i_lenAlloc !=
2077                         epos->offset - udf_file_entry_alloc_offset(inode));
2078         } else {
2079                 aed = (struct allocExtDesc *)epos->bh->b_data;
2080                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2081                         epos->offset - sizeof(struct allocExtDesc));
2082                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2083         }
2084
2085         udf_write_aext(inode, epos, eloc, elen, inc);
2086
2087         if (!epos->bh) {
2088                 iinfo->i_lenAlloc += adsize;
2089                 mark_inode_dirty(inode);
2090         } else {
2091                 aed = (struct allocExtDesc *)epos->bh->b_data;
2092                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2093                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2094                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2095                         udf_update_tag(epos->bh->b_data,
2096                                         epos->offset + (inc ? 0 : adsize));
2097                 else
2098                         udf_update_tag(epos->bh->b_data,
2099                                         sizeof(struct allocExtDesc));
2100                 mark_buffer_dirty_inode(epos->bh, inode);
2101         }
2102
2103         return 0;
2104 }
2105
2106 /*
2107  * Append extent at given position - should be the first free one in inode
2108  * / indirect extent. Takes care of allocating and linking indirect blocks.
2109  */
2110 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2111                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2112 {
2113         int adsize;
2114         struct super_block *sb = inode->i_sb;
2115
2116         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2117                 adsize = sizeof(struct short_ad);
2118         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2119                 adsize = sizeof(struct long_ad);
2120         else
2121                 return -EIO;
2122
2123         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2124                 int err;
2125                 udf_pblk_t new_block;
2126
2127                 new_block = udf_new_block(sb, NULL,
2128                                           epos->block.partitionReferenceNum,
2129                                           epos->block.logicalBlockNum, &err);
2130                 if (!new_block)
2131                         return -ENOSPC;
2132
2133                 err = udf_setup_indirect_aext(inode, new_block, epos);
2134                 if (err)
2135                         return err;
2136         }
2137
2138         return __udf_add_aext(inode, epos, eloc, elen, inc);
2139 }
2140
2141 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2142                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2143 {
2144         int adsize;
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                 ptr = iinfo->i_data + epos->offset -
2152                         udf_file_entry_alloc_offset(inode) +
2153                         iinfo->i_lenEAttr;
2154         else
2155                 ptr = epos->bh->b_data + epos->offset;
2156
2157         switch (iinfo->i_alloc_type) {
2158         case ICBTAG_FLAG_AD_SHORT:
2159                 sad = (struct short_ad *)ptr;
2160                 sad->extLength = cpu_to_le32(elen);
2161                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2162                 adsize = sizeof(struct short_ad);
2163                 break;
2164         case ICBTAG_FLAG_AD_LONG:
2165                 lad = (struct long_ad *)ptr;
2166                 lad->extLength = cpu_to_le32(elen);
2167                 lad->extLocation = cpu_to_lelb(*eloc);
2168                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2169                 adsize = sizeof(struct long_ad);
2170                 break;
2171         default:
2172                 return;
2173         }
2174
2175         if (epos->bh) {
2176                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2177                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2178                         struct allocExtDesc *aed =
2179                                 (struct allocExtDesc *)epos->bh->b_data;
2180                         udf_update_tag(epos->bh->b_data,
2181                                        le32_to_cpu(aed->lengthAllocDescs) +
2182                                        sizeof(struct allocExtDesc));
2183                 }
2184                 mark_buffer_dirty_inode(epos->bh, inode);
2185         } else {
2186                 mark_inode_dirty(inode);
2187         }
2188
2189         if (inc)
2190                 epos->offset += adsize;
2191 }
2192
2193 /*
2194  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2195  * someone does some weird stuff.
2196  */
2197 #define UDF_MAX_INDIR_EXTS 16
2198
2199 /*
2200  * Returns 1 on success, -errno on error, 0 on hit EOF.
2201  */
2202 int udf_next_aext(struct inode *inode, struct extent_position *epos,
2203                   struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype,
2204                   int inc)
2205 {
2206         unsigned int indirections = 0;
2207         int ret = 0;
2208         udf_pblk_t block;
2209
2210         while (1) {
2211                 ret = udf_current_aext(inode, epos, eloc, elen,
2212                                        etype, inc);
2213                 if (ret <= 0)
2214                         return ret;
2215                 if (*etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30))
2216                         return ret;
2217
2218                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2219                         udf_err(inode->i_sb,
2220                                 "too many indirect extents in inode %lu\n",
2221                                 inode->i_ino);
2222                         return -EFSCORRUPTED;
2223                 }
2224
2225                 epos->block = *eloc;
2226                 epos->offset = sizeof(struct allocExtDesc);
2227                 brelse(epos->bh);
2228                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2229                 epos->bh = sb_bread(inode->i_sb, block);
2230                 if (!epos->bh) {
2231                         udf_debug("reading block %u failed!\n", block);
2232                         return -EIO;
2233                 }
2234         }
2235 }
2236
2237 /*
2238  * Returns 1 on success, -errno on error, 0 on hit EOF.
2239  */
2240 int udf_current_aext(struct inode *inode, struct extent_position *epos,
2241                      struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype,
2242                      int inc)
2243 {
2244         int alen;
2245         uint8_t *ptr;
2246         struct short_ad *sad;
2247         struct long_ad *lad;
2248         struct udf_inode_info *iinfo = UDF_I(inode);
2249
2250         if (!epos->bh) {
2251                 if (!epos->offset)
2252                         epos->offset = udf_file_entry_alloc_offset(inode);
2253                 ptr = iinfo->i_data + epos->offset -
2254                         udf_file_entry_alloc_offset(inode) +
2255                         iinfo->i_lenEAttr;
2256                 alen = udf_file_entry_alloc_offset(inode) +
2257                                                         iinfo->i_lenAlloc;
2258         } else {
2259                 struct allocExtDesc *header =
2260                         (struct allocExtDesc *)epos->bh->b_data;
2261
2262                 if (!epos->offset)
2263                         epos->offset = sizeof(struct allocExtDesc);
2264                 ptr = epos->bh->b_data + epos->offset;
2265                 if (check_add_overflow(sizeof(struct allocExtDesc),
2266                                 le32_to_cpu(header->lengthAllocDescs), &alen))
2267                         return -1;
2268         }
2269
2270         switch (iinfo->i_alloc_type) {
2271         case ICBTAG_FLAG_AD_SHORT:
2272                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2273                 if (!sad)
2274                         return 0;
2275                 *etype = le32_to_cpu(sad->extLength) >> 30;
2276                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2277                 eloc->partitionReferenceNum =
2278                                 iinfo->i_location.partitionReferenceNum;
2279                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2280                 break;
2281         case ICBTAG_FLAG_AD_LONG:
2282                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2283                 if (!lad)
2284                         return 0;
2285                 *etype = le32_to_cpu(lad->extLength) >> 30;
2286                 *eloc = lelb_to_cpu(lad->extLocation);
2287                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2288                 break;
2289         default:
2290                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2291                 return -EINVAL;
2292         }
2293
2294         return 1;
2295 }
2296
2297 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2298                            struct kernel_lb_addr neloc, uint32_t nelen)
2299 {
2300         struct kernel_lb_addr oeloc;
2301         uint32_t oelen;
2302         int8_t etype;
2303         int ret;
2304
2305         if (epos.bh)
2306                 get_bh(epos.bh);
2307
2308         while (1) {
2309                 ret = udf_next_aext(inode, &epos, &oeloc, &oelen, &etype, 0);
2310                 if (ret <= 0)
2311                         break;
2312                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2313                 neloc = oeloc;
2314                 nelen = (etype << 30) | oelen;
2315         }
2316         if (ret == 0)
2317                 ret = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2318         brelse(epos.bh);
2319
2320         return ret;
2321 }
2322
2323 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2324 {
2325         struct extent_position oepos;
2326         int adsize;
2327         int8_t etype;
2328         struct allocExtDesc *aed;
2329         struct udf_inode_info *iinfo;
2330         struct kernel_lb_addr eloc;
2331         uint32_t elen;
2332         int ret;
2333
2334         if (epos.bh) {
2335                 get_bh(epos.bh);
2336                 get_bh(epos.bh);
2337         }
2338
2339         iinfo = UDF_I(inode);
2340         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2341                 adsize = sizeof(struct short_ad);
2342         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2343                 adsize = sizeof(struct long_ad);
2344         else
2345                 adsize = 0;
2346
2347         oepos = epos;
2348         if (udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1) <= 0)
2349                 return -1;
2350
2351         while (1) {
2352                 ret = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1);
2353                 if (ret < 0) {
2354                         brelse(epos.bh);
2355                         brelse(oepos.bh);
2356                         return -1;
2357                 }
2358                 if (ret == 0)
2359                         break;
2360                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2361                 if (oepos.bh != epos.bh) {
2362                         oepos.block = epos.block;
2363                         brelse(oepos.bh);
2364                         get_bh(epos.bh);
2365                         oepos.bh = epos.bh;
2366                         oepos.offset = epos.offset - adsize;
2367                 }
2368         }
2369         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2370         elen = 0;
2371
2372         if (epos.bh != oepos.bh) {
2373                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2374                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2375                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2376                 if (!oepos.bh) {
2377                         iinfo->i_lenAlloc -= (adsize * 2);
2378                         mark_inode_dirty(inode);
2379                 } else {
2380                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2381                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2382                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2383                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2384                                 udf_update_tag(oepos.bh->b_data,
2385                                                 oepos.offset - (2 * adsize));
2386                         else
2387                                 udf_update_tag(oepos.bh->b_data,
2388                                                 sizeof(struct allocExtDesc));
2389                         mark_buffer_dirty_inode(oepos.bh, inode);
2390                 }
2391         } else {
2392                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2393                 if (!oepos.bh) {
2394                         iinfo->i_lenAlloc -= adsize;
2395                         mark_inode_dirty(inode);
2396                 } else {
2397                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2398                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2399                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2400                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2401                                 udf_update_tag(oepos.bh->b_data,
2402                                                 epos.offset - adsize);
2403                         else
2404                                 udf_update_tag(oepos.bh->b_data,
2405                                                 sizeof(struct allocExtDesc));
2406                         mark_buffer_dirty_inode(oepos.bh, inode);
2407                 }
2408         }
2409
2410         brelse(epos.bh);
2411         brelse(oepos.bh);
2412
2413         return (elen >> 30);
2414 }
2415
2416 /*
2417  * Returns 1 on success, -errno on error, 0 on hit EOF.
2418  */
2419 int inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos,
2420                struct kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset,
2421                int8_t *etype)
2422 {
2423         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2424         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2425         struct udf_inode_info *iinfo;
2426         int err = 0;
2427
2428         iinfo = UDF_I(inode);
2429         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2430                 pos->offset = 0;
2431                 pos->block = iinfo->i_location;
2432                 pos->bh = NULL;
2433         }
2434         *elen = 0;
2435         do {
2436                 err = udf_next_aext(inode, pos, eloc, elen, etype, 1);
2437                 if (err <= 0) {
2438                         if (err == 0) {
2439                                 *offset = (bcount - lbcount) >> blocksize_bits;
2440                                 iinfo->i_lenExtents = lbcount;
2441                         }
2442                         return err;
2443                 }
2444                 lbcount += *elen;
2445         } while (lbcount <= bcount);
2446         /* update extent cache */
2447         udf_update_extent_cache(inode, lbcount - *elen, pos);
2448         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2449
2450         return 1;
2451 }