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 page **pagep, 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, pagep,
 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         *pagep = &folio->page;
 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 page *page, void *fsdata)
 277 {
 278         struct inode *inode = file_inode(file);
 279         struct folio *folio;
 280         loff_t last_pos;
 281
 282         if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 283                 return generic_write_end(file, mapping, pos, len, copied, page,
 284                                          fsdata);
 285         folio = page_folio(page);
 286         last_pos = pos + copied;
 287         if (last_pos > inode->i_size)
 288                 i_size_write(inode, last_pos);
 289         folio_mark_dirty(folio);
 290         folio_unlock(folio);
 291         folio_put(folio);
 292
 293         return copied;
 294 }
 295
 296 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 297 {
 298         struct file *file = iocb->ki_filp;
 299         struct address_space *mapping = file->f_mapping;
 300         struct inode *inode = mapping->host;
 301         size_t count = iov_iter_count(iter);
 302         ssize_t ret;
 303
 304         /* Fallback to buffered IO for in-ICB files */
 305         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 306                 return 0;
 307         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 308         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 309                 udf_write_failed(mapping, iocb->ki_pos + count);
 310         return ret;
 311 }
 312
 313 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 314 {
 315         struct udf_inode_info *iinfo = UDF_I(mapping->host);
 316
 317         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 318                 return -EINVAL;
 319         return generic_block_bmap(mapping, block, udf_get_block);
 320 }
 321
 322 const struct address_space_operations udf_aops = {
 323         .dirty_folio    = block_dirty_folio,
 324         .invalidate_folio = block_invalidate_folio,
 325         .read_folio     = udf_read_folio,
 326         .readahead      = udf_readahead,
 327         .writepages     = udf_writepages,
 328         .write_begin    = udf_write_begin,
 329         .write_end      = udf_write_end,
 330         .direct_IO      = udf_direct_IO,
 331         .bmap           = udf_bmap,
 332         .migrate_folio  = buffer_migrate_folio,
 333 };
 334
 335 /*
 336  * Expand file stored in ICB to a normal one-block-file
 337  *
 338  * This function requires i_mutex held
 339  */
 340 int udf_expand_file_adinicb(struct inode *inode)
 341 {
 342         struct folio *folio;
 343         struct udf_inode_info *iinfo = UDF_I(inode);
 344         int err;
 345
 346         WARN_ON_ONCE(!inode_is_locked(inode));
 347         if (!iinfo->i_lenAlloc) {
 348                 down_write(&iinfo->i_data_sem);
 349                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 350                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 351                 else
 352                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 353                 up_write(&iinfo->i_data_sem);
 354                 mark_inode_dirty(inode);
 355                 return 0;
 356         }
 357
 358         folio = __filemap_get_folio(inode->i_mapping, 0,
 359                         FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL);
 360         if (IS_ERR(folio))
 361                 return PTR_ERR(folio);
 362
 363         if (!folio_test_uptodate(folio))
 364                 udf_adinicb_read_folio(folio);
 365         down_write(&iinfo->i_data_sem);
 366         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 367                iinfo->i_lenAlloc);
 368         iinfo->i_lenAlloc = 0;
 369         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 370                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 371         else
 372                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 373         folio_mark_dirty(folio);
 374         folio_unlock(folio);
 375         up_write(&iinfo->i_data_sem);
 376         err = filemap_fdatawrite(inode->i_mapping);
 377         if (err) {
 378                 /* Restore everything back so that we don't lose data... */
 379                 folio_lock(folio);
 380                 down_write(&iinfo->i_data_sem);
 381                 memcpy_from_folio(iinfo->i_data + iinfo->i_lenEAttr,
 382                                 folio, 0, inode->i_size);
 383                 folio_unlock(folio);
 384                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 385                 iinfo->i_lenAlloc = inode->i_size;
 386                 up_write(&iinfo->i_data_sem);
 387         }
 388         folio_put(folio);
 389         mark_inode_dirty(inode);
 390
 391         return err;
 392 }
 393
 394 #define UDF_MAP_CREATE          0x01    /* Mapping can allocate new blocks */
 395 #define UDF_MAP_NOPREALLOC      0x02    /* Do not preallocate blocks */
 396
 397 #define UDF_BLK_MAPPED  0x01    /* Block was successfully mapped */
 398 #define UDF_BLK_NEW     0x02    /* Block was freshly allocated */
 399
 400 struct udf_map_rq {
 401         sector_t lblk;
 402         udf_pblk_t pblk;
 403         int iflags;             /* UDF_MAP_ flags determining behavior */
 404         int oflags;             /* UDF_BLK_ flags reporting results */
 405 };
 406
 407 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
 408 {
 409         int err;
 410         struct udf_inode_info *iinfo = UDF_I(inode);
 411
 412         if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
 413                 return -EFSCORRUPTED;
 414
 415         map->oflags = 0;
 416         if (!(map->iflags & UDF_MAP_CREATE)) {
 417                 struct kernel_lb_addr eloc;
 418                 uint32_t elen;
 419                 sector_t offset;
 420                 struct extent_position epos = {};
 421
 422                 down_read(&iinfo->i_data_sem);
 423                 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
 424                                 == (EXT_RECORDED_ALLOCATED >> 30)) {
 425                         map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
 426                                                         offset);
 427                         map->oflags |= UDF_BLK_MAPPED;
 428                 }
 429                 up_read(&iinfo->i_data_sem);
 430                 brelse(epos.bh);
 431
 432                 return 0;
 433         }
 434
 435         down_write(&iinfo->i_data_sem);
 436         /*
 437          * Block beyond EOF and prealloc extents? Just discard preallocation
 438          * as it is not useful and complicates things.
 439          */
 440         if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
 441                 udf_discard_prealloc(inode);
 442         udf_clear_extent_cache(inode);
 443         err = inode_getblk(inode, map);
 444         up_write(&iinfo->i_data_sem);
 445         return err;
 446 }
 447
 448 static int __udf_get_block(struct inode *inode, sector_t block,
 449                            struct buffer_head *bh_result, int flags)
 450 {
 451         int err;
 452         struct udf_map_rq map = {
 453                 .lblk = block,
 454                 .iflags = flags,
 455         };
 456
 457         err = udf_map_block(inode, &map);
 458         if (err < 0)
 459                 return err;
 460         if (map.oflags & UDF_BLK_MAPPED) {
 461                 map_bh(bh_result, inode->i_sb, map.pblk);
 462                 if (map.oflags & UDF_BLK_NEW)
 463                         set_buffer_new(bh_result);
 464         }
 465         return 0;
 466 }
 467
 468 int udf_get_block(struct inode *inode, sector_t block,
 469                   struct buffer_head *bh_result, int create)
 470 {
 471         int flags = create ? UDF_MAP_CREATE : 0;
 472
 473         /*
 474          * We preallocate blocks only for regular files. It also makes sense
 475          * for directories but there's a problem when to drop the
 476          * preallocation. We might use some delayed work for that but I feel
 477          * it's overengineering for a filesystem like UDF.
 478          */
 479         if (!S_ISREG(inode->i_mode))
 480                 flags |= UDF_MAP_NOPREALLOC;
 481         return __udf_get_block(inode, block, bh_result, flags);
 482 }
 483
 484 /*
 485  * We shouldn't be allocating blocks on page writeback since we allocate them
 486  * on page fault. We can spot dirty buffers without allocated blocks though
 487  * when truncate expands file. These however don't have valid data so we can
 488  * safely ignore them. So never allocate blocks from page writeback.
 489  */
 490 static int udf_get_block_wb(struct inode *inode, sector_t block,
 491                             struct buffer_head *bh_result, int create)
 492 {
 493         return __udf_get_block(inode, block, bh_result, 0);
 494 }
 495
 496 /* Extend the file with new blocks totaling 'new_block_bytes',
 497  * return the number of extents added
 498  */
 499 static int udf_do_extend_file(struct inode *inode,
 500                               struct extent_position *last_pos,
 501                               struct kernel_long_ad *last_ext,
 502                               loff_t new_block_bytes)
 503 {
 504         uint32_t add;
 505         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 506         struct super_block *sb = inode->i_sb;
 507         struct udf_inode_info *iinfo;
 508         int err;
 509
 510         /* The previous extent is fake and we should not extend by anything
 511          * - there's nothing to do... */
 512         if (!new_block_bytes && fake)
 513                 return 0;
 514
 515         iinfo = UDF_I(inode);
 516         /* Round the last extent up to a multiple of block size */
 517         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 518                 last_ext->extLength =
 519                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 520                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 521                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 522                 iinfo->i_lenExtents =
 523                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 524                         ~(sb->s_blocksize - 1);
 525         }
 526
 527         add = 0;
 528         /* Can we merge with the previous extent? */
 529         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 530                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 531                 add = (1 << 30) - sb->s_blocksize -
 532                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 533                 if (add > new_block_bytes)
 534                         add = new_block_bytes;
 535                 new_block_bytes -= add;
 536                 last_ext->extLength += add;
 537         }
 538
 539         if (fake) {
 540                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 541                                    last_ext->extLength, 1);
 542                 if (err < 0)
 543                         goto out_err;
 544                 count++;
 545         } else {
 546                 struct kernel_lb_addr tmploc;
 547                 uint32_t tmplen;
 548
 549                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 550                                 last_ext->extLength, 1);
 551
 552                 /*
 553                  * We've rewritten the last extent. If we are going to add
 554                  * more extents, we may need to enter possible following
 555                  * empty indirect extent.
 556                  */
 557                 if (new_block_bytes)
 558                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 559         }
 560         iinfo->i_lenExtents += add;
 561
 562         /* Managed to do everything necessary? */
 563         if (!new_block_bytes)
 564                 goto out;
 565
 566         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 567         last_ext->extLocation.logicalBlockNum = 0;
 568         last_ext->extLocation.partitionReferenceNum = 0;
 569         add = (1 << 30) - sb->s_blocksize;
 570         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 571
 572         /* Create enough extents to cover the whole hole */
 573         while (new_block_bytes > add) {
 574                 new_block_bytes -= add;
 575                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 576                                    last_ext->extLength, 1);
 577                 if (err)
 578                         goto out_err;
 579                 iinfo->i_lenExtents += add;
 580                 count++;
 581         }
 582         if (new_block_bytes) {
 583                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 584                         new_block_bytes;
 585                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 586                                    last_ext->extLength, 1);
 587                 if (err)
 588                         goto out_err;
 589                 iinfo->i_lenExtents += new_block_bytes;
 590                 count++;
 591         }
 592
 593 out:
 594         /* last_pos should point to the last written extent... */
 595         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 596                 last_pos->offset -= sizeof(struct short_ad);
 597         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 598                 last_pos->offset -= sizeof(struct long_ad);
 599         else
 600                 return -EIO;
 601
 602         return count;
 603 out_err:
 604         /* Remove extents we've created so far */
 605         udf_clear_extent_cache(inode);
 606         udf_truncate_extents(inode);
 607         return err;
 608 }
 609
 610 /* Extend the final block of the file to final_block_len bytes */
 611 static void udf_do_extend_final_block(struct inode *inode,
 612                                       struct extent_position *last_pos,
 613                                       struct kernel_long_ad *last_ext,
 614                                       uint32_t new_elen)
 615 {
 616         uint32_t added_bytes;
 617
 618         /*
 619          * Extent already large enough? It may be already rounded up to block
 620          * size...
 621          */
 622         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 623                 return;
 624         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 625         last_ext->extLength += added_bytes;
 626         UDF_I(inode)->i_lenExtents += added_bytes;
 627
 628         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 629                         last_ext->extLength, 1);
 630 }
 631
 632 static int udf_extend_file(struct inode *inode, loff_t newsize)
 633 {
 634
 635         struct extent_position epos;
 636         struct kernel_lb_addr eloc;
 637         uint32_t elen;
 638         int8_t etype;
 639         struct super_block *sb = inode->i_sb;
 640         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 641         loff_t new_elen;
 642         int adsize;
 643         struct udf_inode_info *iinfo = UDF_I(inode);
 644         struct kernel_long_ad extent;
 645         int err = 0;
 646         bool within_last_ext;
 647
 648         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 649                 adsize = sizeof(struct short_ad);
 650         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 651                 adsize = sizeof(struct long_ad);
 652         else
 653                 BUG();
 654
 655         down_write(&iinfo->i_data_sem);
 656         /*
 657          * When creating hole in file, just don't bother with preserving
 658          * preallocation. It likely won't be very useful anyway.
 659          */
 660         udf_discard_prealloc(inode);
 661
 662         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 663         within_last_ext = (etype != -1);
 664         /* We don't expect extents past EOF... */
 665         WARN_ON_ONCE(within_last_ext &&
 666                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 667
 668         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 669             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 670                 /* File has no extents at all or has empty last
 671                  * indirect extent! Create a fake extent... */
 672                 extent.extLocation.logicalBlockNum = 0;
 673                 extent.extLocation.partitionReferenceNum = 0;
 674                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 675         } else {
 676                 epos.offset -= adsize;
 677                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 678                                       &extent.extLength, 0);
 679                 extent.extLength |= etype << 30;
 680         }
 681
 682         new_elen = ((loff_t)offset << inode->i_blkbits) |
 683                                         (newsize & (sb->s_blocksize - 1));
 684
 685         /* File has extent covering the new size (could happen when extending
 686          * inside a block)?
 687          */
 688         if (within_last_ext) {
 689                 /* Extending file within the last file block */
 690                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 691         } else {
 692                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 693         }
 694
 695         if (err < 0)
 696                 goto out;
 697         err = 0;
 698 out:
 699         brelse(epos.bh);
 700         up_write(&iinfo->i_data_sem);
 701         return err;
 702 }
 703
 704 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
 705 {
 706         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 707         struct extent_position prev_epos, cur_epos, next_epos;
 708         int count = 0, startnum = 0, endnum = 0;
 709         uint32_t elen = 0, tmpelen;
 710         struct kernel_lb_addr eloc, tmpeloc;
 711         int c = 1;
 712         loff_t lbcount = 0, b_off = 0;
 713         udf_pblk_t newblocknum;
 714         sector_t offset = 0;
 715         int8_t etype;
 716         struct udf_inode_info *iinfo = UDF_I(inode);
 717         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 718         int lastblock = 0;
 719         bool isBeyondEOF;
 720         int ret = 0;
 721
 722         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 723         prev_epos.block = iinfo->i_location;
 724         prev_epos.bh = NULL;
 725         cur_epos = next_epos = prev_epos;
 726         b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
 727
 728         /* find the extent which contains the block we are looking for.
 729            alternate between laarr[0] and laarr[1] for locations of the
 730            current extent, and the previous extent */
 731         do {
 732                 if (prev_epos.bh != cur_epos.bh) {
 733                         brelse(prev_epos.bh);
 734                         get_bh(cur_epos.bh);
 735                         prev_epos.bh = cur_epos.bh;
 736                 }
 737                 if (cur_epos.bh != next_epos.bh) {
 738                         brelse(cur_epos.bh);
 739                         get_bh(next_epos.bh);
 740                         cur_epos.bh = next_epos.bh;
 741                 }
 742
 743                 lbcount += elen;
 744
 745                 prev_epos.block = cur_epos.block;
 746                 cur_epos.block = next_epos.block;
 747
 748                 prev_epos.offset = cur_epos.offset;
 749                 cur_epos.offset = next_epos.offset;
 750
 751                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 752                 if (etype == -1)
 753                         break;
 754
 755                 c = !c;
 756
 757                 laarr[c].extLength = (etype << 30) | elen;
 758                 laarr[c].extLocation = eloc;
 759
 760                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 761                         pgoal = eloc.logicalBlockNum +
 762                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 763                                  inode->i_sb->s_blocksize_bits);
 764
 765                 count++;
 766         } while (lbcount + elen <= b_off);
 767
 768         b_off -= lbcount;
 769         offset = b_off >> inode->i_sb->s_blocksize_bits;
 770         /*
 771          * Move prev_epos and cur_epos into indirect extent if we are at
 772          * the pointer to it
 773          */
 774         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 775         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 776
 777         /* if the extent is allocated and recorded, return the block
 778            if the extent is not a multiple of the blocksize, round up */
 779
 780         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 781                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 782                         elen = EXT_RECORDED_ALLOCATED |
 783                                 ((elen + inode->i_sb->s_blocksize - 1) &
 784                                  ~(inode->i_sb->s_blocksize - 1));
 785                         iinfo->i_lenExtents =
 786                                 ALIGN(iinfo->i_lenExtents,
 787                                       inode->i_sb->s_blocksize);
 788                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 789                 }
 790                 map->oflags = UDF_BLK_MAPPED;
 791                 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 792                 goto out_free;
 793         }
 794
 795         /* Are we beyond EOF and preallocated extent? */
 796         if (etype == -1) {
 797                 loff_t hole_len;
 798
 799                 isBeyondEOF = true;
 800                 if (count) {
 801                         if (c)
 802                                 laarr[0] = laarr[1];
 803                         startnum = 1;
 804                 } else {
 805                         /* Create a fake extent when there's not one */
 806                         memset(&laarr[0].extLocation, 0x00,
 807                                 sizeof(struct kernel_lb_addr));
 808                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 809                         /* Will udf_do_extend_file() create real extent from
 810                            a fake one? */
 811                         startnum = (offset > 0);
 812                 }
 813                 /* Create extents for the hole between EOF and offset */
 814                 hole_len = (loff_t)offset << inode->i_blkbits;
 815                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 816                 if (ret < 0)
 817                         goto out_free;
 818                 c = 0;
 819                 offset = 0;
 820                 count += ret;
 821                 /*
 822                  * Is there any real extent? - otherwise we overwrite the fake
 823                  * one...
 824                  */
 825                 if (count)
 826                         c = !c;
 827                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 828                         inode->i_sb->s_blocksize;
 829                 memset(&laarr[c].extLocation, 0x00,
 830                         sizeof(struct kernel_lb_addr));
 831                 count++;
 832                 endnum = c + 1;
 833                 lastblock = 1;
 834         } else {
 835                 isBeyondEOF = false;
 836                 endnum = startnum = ((count > 2) ? 2 : count);
 837
 838                 /* if the current extent is in position 0,
 839                    swap it with the previous */
 840                 if (!c && count != 1) {
 841                         laarr[2] = laarr[0];
 842                         laarr[0] = laarr[1];
 843                         laarr[1] = laarr[2];
 844                         c = 1;
 845                 }
 846
 847                 /* if the current block is located in an extent,
 848                    read the next extent */
 849                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 850                 if (etype != -1) {
 851                         laarr[c + 1].extLength = (etype << 30) | elen;
 852                         laarr[c + 1].extLocation = eloc;
 853                         count++;
 854                         startnum++;
 855                         endnum++;
 856                 } else
 857                         lastblock = 1;
 858         }
 859
 860         /* if the current extent is not recorded but allocated, get the
 861          * block in the extent corresponding to the requested block */
 862         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 863                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 864         else { /* otherwise, allocate a new block */
 865                 if (iinfo->i_next_alloc_block == map->lblk)
 866                         goal = iinfo->i_next_alloc_goal;
 867
 868                 if (!goal) {
 869                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 870                                 goal = iinfo->i_location.logicalBlockNum + 1;
 871                 }
 872
 873                 newblocknum = udf_new_block(inode->i_sb, inode,
 874                                 iinfo->i_location.partitionReferenceNum,
 875                                 goal, &ret);
 876                 if (!newblocknum)
 877                         goto out_free;
 878                 if (isBeyondEOF)
 879                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 880         }
 881
 882         /* if the extent the requsted block is located in contains multiple
 883          * blocks, split the extent into at most three extents. blocks prior
 884          * to requested block, requested block, and blocks after requested
 885          * block */
 886         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 887
 888         if (!(map->iflags & UDF_MAP_NOPREALLOC))
 889                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 890
 891         /* merge any continuous blocks in laarr */
 892         udf_merge_extents(inode, laarr, &endnum);
 893
 894         /* write back the new extents, inserting new extents if the new number
 895          * of extents is greater than the old number, and deleting extents if
 896          * the new number of extents is less than the old number */
 897         ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 898         if (ret < 0)
 899                 goto out_free;
 900
 901         map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
 902                                 iinfo->i_location.partitionReferenceNum, 0);
 903         if (!map->pblk) {
 904                 ret = -EFSCORRUPTED;
 905                 goto out_free;
 906         }
 907         map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
 908         iinfo->i_next_alloc_block = map->lblk + 1;
 909         iinfo->i_next_alloc_goal = newblocknum + 1;
 910         inode_set_ctime_current(inode);
 911
 912         if (IS_SYNC(inode))
 913                 udf_sync_inode(inode);
 914         else
 915                 mark_inode_dirty(inode);
 916         ret = 0;
 917 out_free:
 918         brelse(prev_epos.bh);
 919         brelse(cur_epos.bh);
 920         brelse(next_epos.bh);
 921         return ret;
 922 }
 923
 924 static void udf_split_extents(struct inode *inode, int *c, int offset,
 925                                udf_pblk_t newblocknum,
 926                                struct kernel_long_ad *laarr, int *endnum)
 927 {
 928         unsigned long blocksize = inode->i_sb->s_blocksize;
 929         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 930
 931         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 932             (laarr[*c].extLength >> 30) ==
 933                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 934                 int curr = *c;
 935                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 936                             blocksize - 1) >> blocksize_bits;
 937                 int8_t etype = (laarr[curr].extLength >> 30);
 938
 939                 if (blen == 1)
 940                         ;
 941                 else if (!offset || blen == offset + 1) {
 942                         laarr[curr + 2] = laarr[curr + 1];
 943                         laarr[curr + 1] = laarr[curr];
 944                 } else {
 945                         laarr[curr + 3] = laarr[curr + 1];
 946                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 947                 }
 948
 949                 if (offset) {
 950                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 951                                 udf_free_blocks(inode->i_sb, inode,
 952                                                 &laarr[curr].extLocation,
 953                                                 0, offset);
 954                                 laarr[curr].extLength =
 955                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 956                                         (offset << blocksize_bits);
 957                                 laarr[curr].extLocation.logicalBlockNum = 0;
 958                                 laarr[curr].extLocation.
 959                                                 partitionReferenceNum = 0;
 960                         } else
 961                                 laarr[curr].extLength = (etype << 30) |
 962                                         (offset << blocksize_bits);
 963                         curr++;
 964                         (*c)++;
 965                         (*endnum)++;
 966                 }
 967
 968                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 969                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 970                         laarr[curr].extLocation.partitionReferenceNum =
 971                                 UDF_I(inode)->i_location.partitionReferenceNum;
 972                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 973                         blocksize;
 974                 curr++;
 975
 976                 if (blen != offset + 1) {
 977                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 978                                 laarr[curr].extLocation.logicalBlockNum +=
 979                                                                 offset + 1;
 980                         laarr[curr].extLength = (etype << 30) |
 981                                 ((blen - (offset + 1)) << blocksize_bits);
 982                         curr++;
 983                         (*endnum)++;
 984                 }
 985         }
 986 }
 987
 988 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 989                                  struct kernel_long_ad *laarr,
 990                                  int *endnum)
 991 {
 992         int start, length = 0, currlength = 0, i;
 993
 994         if (*endnum >= (c + 1)) {
 995                 if (!lastblock)
 996                         return;
 997                 else
 998                         start = c;
 999         } else {
1000                 if ((laarr[c + 1].extLength >> 30) ==
1001                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1002                         start = c + 1;
1003                         length = currlength =
1004                                 (((laarr[c + 1].extLength &
1005                                         UDF_EXTENT_LENGTH_MASK) +
1006                                 inode->i_sb->s_blocksize - 1) >>
1007                                 inode->i_sb->s_blocksize_bits);
1008                 } else
1009                         start = c;
1010         }
1011
1012         for (i = start + 1; i <= *endnum; i++) {
1013                 if (i == *endnum) {
1014                         if (lastblock)
1015                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1016                 } else if ((laarr[i].extLength >> 30) ==
1017                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1018                         length += (((laarr[i].extLength &
1019                                                 UDF_EXTENT_LENGTH_MASK) +
1020                                     inode->i_sb->s_blocksize - 1) >>
1021                                     inode->i_sb->s_blocksize_bits);
1022                 } else
1023                         break;
1024         }
1025
1026         if (length) {
1027                 int next = laarr[start].extLocation.logicalBlockNum +
1028                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1029                           inode->i_sb->s_blocksize - 1) >>
1030                           inode->i_sb->s_blocksize_bits);
1031                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1032                                 laarr[start].extLocation.partitionReferenceNum,
1033                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1034                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1035                                 currlength);
1036                 if (numalloc)   {
1037                         if (start == (c + 1))
1038                                 laarr[start].extLength +=
1039                                         (numalloc <<
1040                                          inode->i_sb->s_blocksize_bits);
1041                         else {
1042                                 memmove(&laarr[c + 2], &laarr[c + 1],
1043                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1044                                 (*endnum)++;
1045                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1046                                 laarr[c + 1].extLocation.partitionReferenceNum =
1047                                         laarr[c].extLocation.
1048                                                         partitionReferenceNum;
1049                                 laarr[c + 1].extLength =
1050                                         EXT_NOT_RECORDED_ALLOCATED |
1051                                         (numalloc <<
1052                                          inode->i_sb->s_blocksize_bits);
1053                                 start = c + 1;
1054                         }
1055
1056                         for (i = start + 1; numalloc && i < *endnum; i++) {
1057                                 int elen = ((laarr[i].extLength &
1058                                                 UDF_EXTENT_LENGTH_MASK) +
1059                                             inode->i_sb->s_blocksize - 1) >>
1060                                             inode->i_sb->s_blocksize_bits;
1061
1062                                 if (elen > numalloc) {
1063                                         laarr[i].extLength -=
1064                                                 (numalloc <<
1065                                                  inode->i_sb->s_blocksize_bits);
1066                                         numalloc = 0;
1067                                 } else {
1068                                         numalloc -= elen;
1069                                         if (*endnum > (i + 1))
1070                                                 memmove(&laarr[i],
1071                                                         &laarr[i + 1],
1072                                                         sizeof(struct long_ad) *
1073                                                         (*endnum - (i + 1)));
1074                                         i--;
1075                                         (*endnum)--;
1076                                 }
1077                         }
1078                         UDF_I(inode)->i_lenExtents +=
1079                                 numalloc << inode->i_sb->s_blocksize_bits;
1080                 }
1081         }
1082 }
1083
1084 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1085                               int *endnum)
1086 {
1087         int i;
1088         unsigned long blocksize = inode->i_sb->s_blocksize;
1089         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1090
1091         for (i = 0; i < (*endnum - 1); i++) {
1092                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1093                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1094
1095                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1096                         (((li->extLength >> 30) ==
1097                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1098                         ((lip1->extLocation.logicalBlockNum -
1099                           li->extLocation.logicalBlockNum) ==
1100                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1101                         blocksize - 1) >> blocksize_bits)))) {
1102
1103                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1104                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1105                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1106                                 li->extLength = lip1->extLength +
1107                                         (((li->extLength &
1108                                                 UDF_EXTENT_LENGTH_MASK) +
1109                                          blocksize - 1) & ~(blocksize - 1));
1110                                 if (*endnum > (i + 2))
1111                                         memmove(&laarr[i + 1], &laarr[i + 2],
1112                                                 sizeof(struct long_ad) *
1113                                                 (*endnum - (i + 2)));
1114                                 i--;
1115                                 (*endnum)--;
1116                         }
1117                 } else if (((li->extLength >> 30) ==
1118                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1119                            ((lip1->extLength >> 30) ==
1120                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1121                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1122                                         ((li->extLength &
1123                                           UDF_EXTENT_LENGTH_MASK) +
1124                                          blocksize - 1) >> blocksize_bits);
1125                         li->extLocation.logicalBlockNum = 0;
1126                         li->extLocation.partitionReferenceNum = 0;
1127
1128                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1129                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1130                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1131                                 lip1->extLength = (lip1->extLength -
1132                                                    (li->extLength &
1133                                                    UDF_EXTENT_LENGTH_MASK) +
1134                                                    UDF_EXTENT_LENGTH_MASK) &
1135                                                    ~(blocksize - 1);
1136                                 li->extLength = (li->extLength &
1137                                                  UDF_EXTENT_FLAG_MASK) +
1138                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1139                                                 blocksize;
1140                         } else {
1141                                 li->extLength = lip1->extLength +
1142                                         (((li->extLength &
1143                                                 UDF_EXTENT_LENGTH_MASK) +
1144                                           blocksize - 1) & ~(blocksize - 1));
1145                                 if (*endnum > (i + 2))
1146                                         memmove(&laarr[i + 1], &laarr[i + 2],
1147                                                 sizeof(struct long_ad) *
1148                                                 (*endnum - (i + 2)));
1149                                 i--;
1150                                 (*endnum)--;
1151                         }
1152                 } else if ((li->extLength >> 30) ==
1153                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1154                         udf_free_blocks(inode->i_sb, inode,
1155                                         &li->extLocation, 0,
1156                                         ((li->extLength &
1157                                                 UDF_EXTENT_LENGTH_MASK) +
1158                                          blocksize - 1) >> blocksize_bits);
1159                         li->extLocation.logicalBlockNum = 0;
1160                         li->extLocation.partitionReferenceNum = 0;
1161                         li->extLength = (li->extLength &
1162                                                 UDF_EXTENT_LENGTH_MASK) |
1163                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1164                 }
1165         }
1166 }
1167
1168 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1169                               int startnum, int endnum,
1170                               struct extent_position *epos)
1171 {
1172         int start = 0, i;
1173         struct kernel_lb_addr tmploc;
1174         uint32_t tmplen;
1175         int err;
1176
1177         if (startnum > endnum) {
1178                 for (i = 0; i < (startnum - endnum); i++)
1179                         udf_delete_aext(inode, *epos);
1180         } else if (startnum < endnum) {
1181                 for (i = 0; i < (endnum - startnum); i++) {
1182                         err = udf_insert_aext(inode, *epos,
1183                                               laarr[i].extLocation,
1184                                               laarr[i].extLength);
1185                         /*
1186                          * If we fail here, we are likely corrupting the extent
1187                          * list and leaking blocks. At least stop early to
1188                          * limit the damage.
1189                          */
1190                         if (err < 0)
1191                                 return err;
1192                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1193                                       &laarr[i].extLength, 1);
1194                         start++;
1195                 }
1196         }
1197
1198         for (i = start; i < endnum; i++) {
1199                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1200                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1201                                laarr[i].extLength, 1);
1202         }
1203         return 0;
1204 }
1205
1206 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1207                               int create, int *err)
1208 {
1209         struct buffer_head *bh = NULL;
1210         struct udf_map_rq map = {
1211                 .lblk = block,
1212                 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1213         };
1214
1215         *err = udf_map_block(inode, &map);
1216         if (*err || !(map.oflags & UDF_BLK_MAPPED))
1217                 return NULL;
1218
1219         bh = sb_getblk(inode->i_sb, map.pblk);
1220         if (!bh) {
1221                 *err = -ENOMEM;
1222                 return NULL;
1223         }
1224         if (map.oflags & UDF_BLK_NEW) {
1225                 lock_buffer(bh);
1226                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1227                 set_buffer_uptodate(bh);
1228                 unlock_buffer(bh);
1229                 mark_buffer_dirty_inode(bh, inode);
1230                 return bh;
1231         }
1232
1233         if (bh_read(bh, 0) >= 0)
1234                 return bh;
1235
1236         brelse(bh);
1237         *err = -EIO;
1238         return NULL;
1239 }
1240
1241 int udf_setsize(struct inode *inode, loff_t newsize)
1242 {
1243         int err = 0;
1244         struct udf_inode_info *iinfo;
1245         unsigned int bsize = i_blocksize(inode);
1246
1247         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1248               S_ISLNK(inode->i_mode)))
1249                 return -EINVAL;
1250         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1251                 return -EPERM;
1252
1253         filemap_invalidate_lock(inode->i_mapping);
1254         iinfo = UDF_I(inode);
1255         if (newsize > inode->i_size) {
1256                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1257                         if (bsize >=
1258                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1259                                 down_write(&iinfo->i_data_sem);
1260                                 iinfo->i_lenAlloc = newsize;
1261                                 up_write(&iinfo->i_data_sem);
1262                                 goto set_size;
1263                         }
1264                         err = udf_expand_file_adinicb(inode);
1265                         if (err)
1266                                 goto out_unlock;
1267                 }
1268                 err = udf_extend_file(inode, newsize);
1269                 if (err)
1270                         goto out_unlock;
1271 set_size:
1272                 truncate_setsize(inode, newsize);
1273         } else {
1274                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1275                         down_write(&iinfo->i_data_sem);
1276                         udf_clear_extent_cache(inode);
1277                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1278                                0x00, bsize - newsize -
1279                                udf_file_entry_alloc_offset(inode));
1280                         iinfo->i_lenAlloc = newsize;
1281                         truncate_setsize(inode, newsize);
1282                         up_write(&iinfo->i_data_sem);
1283                         goto update_time;
1284                 }
1285                 err = block_truncate_page(inode->i_mapping, newsize,
1286                                           udf_get_block);
1287                 if (err)
1288                         goto out_unlock;
1289                 truncate_setsize(inode, newsize);
1290                 down_write(&iinfo->i_data_sem);
1291                 udf_clear_extent_cache(inode);
1292                 err = udf_truncate_extents(inode);
1293                 up_write(&iinfo->i_data_sem);
1294                 if (err)
1295                         goto out_unlock;
1296         }
1297 update_time:
1298         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1299         if (IS_SYNC(inode))
1300                 udf_sync_inode(inode);
1301         else
1302                 mark_inode_dirty(inode);
1303 out_unlock:
1304         filemap_invalidate_unlock(inode->i_mapping);
1305         return err;
1306 }
1307
1308 /*
1309  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1310  * arbitrary - just that we hopefully don't limit any real use of rewritten
1311  * inode on write-once media but avoid looping for too long on corrupted media.
1312  */
1313 #define UDF_MAX_ICB_NESTING 1024
1314
1315 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1316 {
1317         struct buffer_head *bh = NULL;
1318         struct fileEntry *fe;
1319         struct extendedFileEntry *efe;
1320         uint16_t ident;
1321         struct udf_inode_info *iinfo = UDF_I(inode);
1322         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1323         struct kernel_lb_addr *iloc = &iinfo->i_location;
1324         unsigned int link_count;
1325         unsigned int indirections = 0;
1326         int bs = inode->i_sb->s_blocksize;
1327         int ret = -EIO;
1328         uint32_t uid, gid;
1329         struct timespec64 ts;
1330
1331 reread:
1332         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1333                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1334                           iloc->partitionReferenceNum, sbi->s_partitions);
1335                 return -EIO;
1336         }
1337
1338         if (iloc->logicalBlockNum >=
1339             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1340                 udf_debug("block=%u, partition=%u out of range\n",
1341                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1342                 return -EIO;
1343         }
1344
1345         /*
1346          * Set defaults, but the inode is still incomplete!
1347          * Note: get_new_inode() sets the following on a new inode:
1348          *      i_sb = sb
1349          *      i_no = ino
1350          *      i_flags = sb->s_flags
1351          *      i_state = 0
1352          * clean_inode(): zero fills and sets
1353          *      i_count = 1
1354          *      i_nlink = 1
1355          *      i_op = NULL;
1356          */
1357         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1358         if (!bh) {
1359                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1360                 return -EIO;
1361         }
1362
1363         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1364             ident != TAG_IDENT_USE) {
1365                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1366                         inode->i_ino, ident);
1367                 goto out;
1368         }
1369
1370         fe = (struct fileEntry *)bh->b_data;
1371         efe = (struct extendedFileEntry *)bh->b_data;
1372
1373         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1374                 struct buffer_head *ibh;
1375
1376                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1377                 if (ident == TAG_IDENT_IE && ibh) {
1378                         struct kernel_lb_addr loc;
1379                         struct indirectEntry *ie;
1380
1381                         ie = (struct indirectEntry *)ibh->b_data;
1382                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1383
1384                         if (ie->indirectICB.extLength) {
1385                                 brelse(ibh);
1386                                 memcpy(&iinfo->i_location, &loc,
1387                                        sizeof(struct kernel_lb_addr));
1388                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1389                                         udf_err(inode->i_sb,
1390                                                 "too many ICBs in ICB hierarchy"
1391                                                 " (max %d supported)\n",
1392                                                 UDF_MAX_ICB_NESTING);
1393                                         goto out;
1394                                 }
1395                                 brelse(bh);
1396                                 goto reread;
1397                         }
1398                 }
1399                 brelse(ibh);
1400         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1401                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1402                         le16_to_cpu(fe->icbTag.strategyType));
1403                 goto out;
1404         }
1405         if (fe->icbTag.strategyType == cpu_to_le16(4))
1406                 iinfo->i_strat4096 = 0;
1407         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1408                 iinfo->i_strat4096 = 1;
1409
1410         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1411                                                         ICBTAG_FLAG_AD_MASK;
1412         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1413             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1414             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1415                 ret = -EIO;
1416                 goto out;
1417         }
1418         iinfo->i_hidden = hidden_inode;
1419         iinfo->i_unique = 0;
1420         iinfo->i_lenEAttr = 0;
1421         iinfo->i_lenExtents = 0;
1422         iinfo->i_lenAlloc = 0;
1423         iinfo->i_next_alloc_block = 0;
1424         iinfo->i_next_alloc_goal = 0;
1425         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1426                 iinfo->i_efe = 1;
1427                 iinfo->i_use = 0;
1428                 ret = udf_alloc_i_data(inode, bs -
1429                                         sizeof(struct extendedFileEntry));
1430                 if (ret)
1431                         goto out;
1432                 memcpy(iinfo->i_data,
1433                        bh->b_data + sizeof(struct extendedFileEntry),
1434                        bs - sizeof(struct extendedFileEntry));
1435         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1436                 iinfo->i_efe = 0;
1437                 iinfo->i_use = 0;
1438                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1439                 if (ret)
1440                         goto out;
1441                 memcpy(iinfo->i_data,
1442                        bh->b_data + sizeof(struct fileEntry),
1443                        bs - sizeof(struct fileEntry));
1444         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1445                 iinfo->i_efe = 0;
1446                 iinfo->i_use = 1;
1447                 iinfo->i_lenAlloc = le32_to_cpu(
1448                                 ((struct unallocSpaceEntry *)bh->b_data)->
1449                                  lengthAllocDescs);
1450                 ret = udf_alloc_i_data(inode, bs -
1451                                         sizeof(struct unallocSpaceEntry));
1452                 if (ret)
1453                         goto out;
1454                 memcpy(iinfo->i_data,
1455                        bh->b_data + sizeof(struct unallocSpaceEntry),
1456                        bs - sizeof(struct unallocSpaceEntry));
1457                 return 0;
1458         }
1459
1460         ret = -EIO;
1461         read_lock(&sbi->s_cred_lock);
1462         uid = le32_to_cpu(fe->uid);
1463         if (uid == UDF_INVALID_ID ||
1464             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1465                 inode->i_uid = sbi->s_uid;
1466         else
1467                 i_uid_write(inode, uid);
1468
1469         gid = le32_to_cpu(fe->gid);
1470         if (gid == UDF_INVALID_ID ||
1471             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1472                 inode->i_gid = sbi->s_gid;
1473         else
1474                 i_gid_write(inode, gid);
1475
1476         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1477                         sbi->s_fmode != UDF_INVALID_MODE)
1478                 inode->i_mode = sbi->s_fmode;
1479         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1480                         sbi->s_dmode != UDF_INVALID_MODE)
1481                 inode->i_mode = sbi->s_dmode;
1482         else
1483                 inode->i_mode = udf_convert_permissions(fe);
1484         inode->i_mode &= ~sbi->s_umask;
1485         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1486
1487         read_unlock(&sbi->s_cred_lock);
1488
1489         link_count = le16_to_cpu(fe->fileLinkCount);
1490         if (!link_count) {
1491                 if (!hidden_inode) {
1492                         ret = -ESTALE;
1493                         goto out;
1494                 }
1495                 link_count = 1;
1496         }
1497         set_nlink(inode, link_count);
1498
1499         inode->i_size = le64_to_cpu(fe->informationLength);
1500         iinfo->i_lenExtents = inode->i_size;
1501
1502         if (iinfo->i_efe == 0) {
1503                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1504                         (inode->i_sb->s_blocksize_bits - 9);
1505
1506                 udf_disk_stamp_to_time(&ts, fe->accessTime);
1507                 inode_set_atime_to_ts(inode, ts);
1508                 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1509                 inode_set_mtime_to_ts(inode, ts);
1510                 udf_disk_stamp_to_time(&ts, fe->attrTime);
1511                 inode_set_ctime_to_ts(inode, ts);
1512
1513                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1514                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1515                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1516                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1517                 iinfo->i_streamdir = 0;
1518                 iinfo->i_lenStreams = 0;
1519         } else {
1520                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1521                     (inode->i_sb->s_blocksize_bits - 9);
1522
1523                 udf_disk_stamp_to_time(&ts, efe->accessTime);
1524                 inode_set_atime_to_ts(inode, ts);
1525                 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1526                 inode_set_mtime_to_ts(inode, ts);
1527                 udf_disk_stamp_to_time(&ts, efe->attrTime);
1528                 inode_set_ctime_to_ts(inode, ts);
1529                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1530
1531                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1532                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1533                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1534                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1535
1536                 /* Named streams */
1537                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1538                 iinfo->i_locStreamdir =
1539                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1540                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1541                 if (iinfo->i_lenStreams >= inode->i_size)
1542                         iinfo->i_lenStreams -= inode->i_size;
1543                 else
1544                         iinfo->i_lenStreams = 0;
1545         }
1546         inode->i_generation = iinfo->i_unique;
1547
1548         /*
1549          * Sanity check length of allocation descriptors and extended attrs to
1550          * avoid integer overflows
1551          */
1552         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1553                 goto out;
1554         /* Now do exact checks */
1555         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1556                 goto out;
1557         /* Sanity checks for files in ICB so that we don't get confused later */
1558         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1559                 /*
1560                  * For file in ICB data is stored in allocation descriptor
1561                  * so sizes should match
1562                  */
1563                 if (iinfo->i_lenAlloc != inode->i_size)
1564                         goto out;
1565                 /* File in ICB has to fit in there... */
1566                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1567                         goto out;
1568         }
1569
1570         switch (fe->icbTag.fileType) {
1571         case ICBTAG_FILE_TYPE_DIRECTORY:
1572                 inode->i_op = &udf_dir_inode_operations;
1573                 inode->i_fop = &udf_dir_operations;
1574                 inode->i_mode |= S_IFDIR;
1575                 inc_nlink(inode);
1576                 break;
1577         case ICBTAG_FILE_TYPE_REALTIME:
1578         case ICBTAG_FILE_TYPE_REGULAR:
1579         case ICBTAG_FILE_TYPE_UNDEF:
1580         case ICBTAG_FILE_TYPE_VAT20:
1581                 inode->i_data.a_ops = &udf_aops;
1582                 inode->i_op = &udf_file_inode_operations;
1583                 inode->i_fop = &udf_file_operations;
1584                 inode->i_mode |= S_IFREG;
1585                 break;
1586         case ICBTAG_FILE_TYPE_BLOCK:
1587                 inode->i_mode |= S_IFBLK;
1588                 break;
1589         case ICBTAG_FILE_TYPE_CHAR:
1590                 inode->i_mode |= S_IFCHR;
1591                 break;
1592         case ICBTAG_FILE_TYPE_FIFO:
1593                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1594                 break;
1595         case ICBTAG_FILE_TYPE_SOCKET:
1596                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1597                 break;
1598         case ICBTAG_FILE_TYPE_SYMLINK:
1599                 inode->i_data.a_ops = &udf_symlink_aops;
1600                 inode->i_op = &udf_symlink_inode_operations;
1601                 inode_nohighmem(inode);
1602                 inode->i_mode = S_IFLNK | 0777;
1603                 break;
1604         case ICBTAG_FILE_TYPE_MAIN:
1605                 udf_debug("METADATA FILE-----\n");
1606                 break;
1607         case ICBTAG_FILE_TYPE_MIRROR:
1608                 udf_debug("METADATA MIRROR FILE-----\n");
1609                 break;
1610         case ICBTAG_FILE_TYPE_BITMAP:
1611                 udf_debug("METADATA BITMAP FILE-----\n");
1612                 break;
1613         default:
1614                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1615                         inode->i_ino, fe->icbTag.fileType);
1616                 goto out;
1617         }
1618         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1619                 struct deviceSpec *dsea =
1620                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1621                 if (dsea) {
1622                         init_special_inode(inode, inode->i_mode,
1623                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1624                                       le32_to_cpu(dsea->minorDeviceIdent)));
1625                         /* Developer ID ??? */
1626                 } else
1627                         goto out;
1628         }
1629         ret = 0;
1630 out:
1631         brelse(bh);
1632         return ret;
1633 }
1634
1635 static int udf_alloc_i_data(struct inode *inode, size_t size)
1636 {
1637         struct udf_inode_info *iinfo = UDF_I(inode);
1638         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1639         if (!iinfo->i_data)
1640                 return -ENOMEM;
1641         return 0;
1642 }
1643
1644 static umode_t udf_convert_permissions(struct fileEntry *fe)
1645 {
1646         umode_t mode;
1647         uint32_t permissions;
1648         uint32_t flags;
1649
1650         permissions = le32_to_cpu(fe->permissions);
1651         flags = le16_to_cpu(fe->icbTag.flags);
1652
1653         mode =  ((permissions) & 0007) |
1654                 ((permissions >> 2) & 0070) |
1655                 ((permissions >> 4) & 0700) |
1656                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1657                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1658                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1659
1660         return mode;
1661 }
1662
1663 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1664 {
1665         struct udf_inode_info *iinfo = UDF_I(inode);
1666
1667         /*
1668          * UDF 2.01 sec. 3.3.3.3 Note 2:
1669          * In Unix, delete permission tracks write
1670          */
1671         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1672         if (mode & 0200)
1673                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1674         if (mode & 0020)
1675                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1676         if (mode & 0002)
1677                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1678 }
1679
1680 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1681 {
1682         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1683 }
1684
1685 static int udf_sync_inode(struct inode *inode)
1686 {
1687         return udf_update_inode(inode, 1);
1688 }
1689
1690 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1691 {
1692         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1693             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1694              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1695                 iinfo->i_crtime = time;
1696 }
1697
1698 static int udf_update_inode(struct inode *inode, int do_sync)
1699 {
1700         struct buffer_head *bh = NULL;
1701         struct fileEntry *fe;
1702         struct extendedFileEntry *efe;
1703         uint64_t lb_recorded;
1704         uint32_t udfperms;
1705         uint16_t icbflags;
1706         uint16_t crclen;
1707         int err = 0;
1708         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1709         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1710         struct udf_inode_info *iinfo = UDF_I(inode);
1711
1712         bh = sb_getblk(inode->i_sb,
1713                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1714         if (!bh) {
1715                 udf_debug("getblk failure\n");
1716                 return -EIO;
1717         }
1718
1719         lock_buffer(bh);
1720         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1721         fe = (struct fileEntry *)bh->b_data;
1722         efe = (struct extendedFileEntry *)bh->b_data;
1723
1724         if (iinfo->i_use) {
1725                 struct unallocSpaceEntry *use =
1726                         (struct unallocSpaceEntry *)bh->b_data;
1727
1728                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1729                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1730                        iinfo->i_data, inode->i_sb->s_blocksize -
1731                                         sizeof(struct unallocSpaceEntry));
1732                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1733                 crclen = sizeof(struct unallocSpaceEntry);
1734
1735                 goto finish;
1736         }
1737
1738         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1739                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1740         else
1741                 fe->uid = cpu_to_le32(i_uid_read(inode));
1742
1743         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1744                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1745         else
1746                 fe->gid = cpu_to_le32(i_gid_read(inode));
1747
1748         udfperms = ((inode->i_mode & 0007)) |
1749                    ((inode->i_mode & 0070) << 2) |
1750                    ((inode->i_mode & 0700) << 4);
1751
1752         udfperms |= iinfo->i_extraPerms;
1753         fe->permissions = cpu_to_le32(udfperms);
1754
1755         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1756                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1757         else {
1758                 if (iinfo->i_hidden)
1759                         fe->fileLinkCount = cpu_to_le16(0);
1760                 else
1761                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1762         }
1763
1764         fe->informationLength = cpu_to_le64(inode->i_size);
1765
1766         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1767                 struct regid *eid;
1768                 struct deviceSpec *dsea =
1769                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1770                 if (!dsea) {
1771                         dsea = (struct deviceSpec *)
1772                                 udf_add_extendedattr(inode,
1773                                                      sizeof(struct deviceSpec) +
1774                                                      sizeof(struct regid), 12, 0x3);
1775                         dsea->attrType = cpu_to_le32(12);
1776                         dsea->attrSubtype = 1;
1777                         dsea->attrLength = cpu_to_le32(
1778                                                 sizeof(struct deviceSpec) +
1779                                                 sizeof(struct regid));
1780                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1781                 }
1782                 eid = (struct regid *)dsea->impUse;
1783                 memset(eid, 0, sizeof(*eid));
1784                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1785                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1786                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1787                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1788                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1789         }
1790
1791         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1792                 lb_recorded = 0; /* No extents => no blocks! */
1793         else
1794                 lb_recorded =
1795                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1796                         (blocksize_bits - 9);
1797
1798         if (iinfo->i_efe == 0) {
1799                 memcpy(bh->b_data + sizeof(struct fileEntry),
1800                        iinfo->i_data,
1801                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1802                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1803
1804                 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1805                 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
1806                 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1807                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1808                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1809                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1810                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1811                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1812                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1813                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1814                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1815                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1816                 crclen = sizeof(struct fileEntry);
1817         } else {
1818                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1819                        iinfo->i_data,
1820                        inode->i_sb->s_blocksize -
1821                                         sizeof(struct extendedFileEntry));
1822                 efe->objectSize =
1823                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1824                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1825
1826                 if (iinfo->i_streamdir) {
1827                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1828
1829                         icb_lad->extLocation =
1830                                 cpu_to_lelb(iinfo->i_locStreamdir);
1831                         icb_lad->extLength =
1832                                 cpu_to_le32(inode->i_sb->s_blocksize);
1833                 }
1834
1835                 udf_adjust_time(iinfo, inode_get_atime(inode));
1836                 udf_adjust_time(iinfo, inode_get_mtime(inode));
1837                 udf_adjust_time(iinfo, inode_get_ctime(inode));
1838
1839                 udf_time_to_disk_stamp(&efe->accessTime,
1840                                        inode_get_atime(inode));
1841                 udf_time_to_disk_stamp(&efe->modificationTime,
1842                                        inode_get_mtime(inode));
1843                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1844                 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1845
1846                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1847                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1848                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1849                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1850                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1851                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1852                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1853                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1854                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1855                 crclen = sizeof(struct extendedFileEntry);
1856         }
1857
1858 finish:
1859         if (iinfo->i_strat4096) {
1860                 fe->icbTag.strategyType = cpu_to_le16(4096);
1861                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1862                 fe->icbTag.numEntries = cpu_to_le16(2);
1863         } else {
1864                 fe->icbTag.strategyType = cpu_to_le16(4);
1865                 fe->icbTag.numEntries = cpu_to_le16(1);
1866         }
1867
1868         if (iinfo->i_use)
1869                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1870         else if (S_ISDIR(inode->i_mode))
1871                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1872         else if (S_ISREG(inode->i_mode))
1873                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1874         else if (S_ISLNK(inode->i_mode))
1875                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1876         else if (S_ISBLK(inode->i_mode))
1877                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1878         else if (S_ISCHR(inode->i_mode))
1879                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1880         else if (S_ISFIFO(inode->i_mode))
1881                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1882         else if (S_ISSOCK(inode->i_mode))
1883                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1884
1885         icbflags =      iinfo->i_alloc_type |
1886                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1887                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1888                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1889                         (le16_to_cpu(fe->icbTag.flags) &
1890                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1891                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1892
1893         fe->icbTag.flags = cpu_to_le16(icbflags);
1894         if (sbi->s_udfrev >= 0x0200)
1895                 fe->descTag.descVersion = cpu_to_le16(3);
1896         else
1897                 fe->descTag.descVersion = cpu_to_le16(2);
1898         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1899         fe->descTag.tagLocation = cpu_to_le32(
1900                                         iinfo->i_location.logicalBlockNum);
1901         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1902         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1903         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1904                                                   crclen));
1905         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1906
1907         set_buffer_uptodate(bh);
1908         unlock_buffer(bh);
1909
1910         /* write the data blocks */
1911         mark_buffer_dirty(bh);
1912         if (do_sync) {
1913                 sync_dirty_buffer(bh);
1914                 if (buffer_write_io_error(bh)) {
1915                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1916                                  inode->i_ino);
1917                         err = -EIO;
1918                 }
1919         }
1920         brelse(bh);
1921
1922         return err;
1923 }
1924
1925 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1926                          bool hidden_inode)
1927 {
1928         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1929         struct inode *inode = iget_locked(sb, block);
1930         int err;
1931
1932         if (!inode)
1933                 return ERR_PTR(-ENOMEM);
1934
1935         if (!(inode->i_state & I_NEW)) {
1936                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1937                         iput(inode);
1938                         return ERR_PTR(-EFSCORRUPTED);
1939                 }
1940                 return inode;
1941         }
1942
1943         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1944         err = udf_read_inode(inode, hidden_inode);
1945         if (err < 0) {
1946                 iget_failed(inode);
1947                 return ERR_PTR(err);
1948         }
1949         unlock_new_inode(inode);
1950
1951         return inode;
1952 }
1953
1954 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1955                             struct extent_position *epos)
1956 {
1957         struct super_block *sb = inode->i_sb;
1958         struct buffer_head *bh;
1959         struct allocExtDesc *aed;
1960         struct extent_position nepos;
1961         struct kernel_lb_addr neloc;
1962         int ver, adsize;
1963
1964         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1965                 adsize = sizeof(struct short_ad);
1966         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1967                 adsize = sizeof(struct long_ad);
1968         else
1969                 return -EIO;
1970
1971         neloc.logicalBlockNum = block;
1972         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1973
1974         bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1975         if (!bh)
1976                 return -EIO;
1977         lock_buffer(bh);
1978         memset(bh->b_data, 0x00, sb->s_blocksize);
1979         set_buffer_uptodate(bh);
1980         unlock_buffer(bh);
1981         mark_buffer_dirty_inode(bh, inode);
1982
1983         aed = (struct allocExtDesc *)(bh->b_data);
1984         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1985                 aed->previousAllocExtLocation =
1986                                 cpu_to_le32(epos->block.logicalBlockNum);
1987         }
1988         aed->lengthAllocDescs = cpu_to_le32(0);
1989         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1990                 ver = 3;
1991         else
1992                 ver = 2;
1993         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1994                     sizeof(struct tag));
1995
1996         nepos.block = neloc;
1997         nepos.offset = sizeof(struct allocExtDesc);
1998         nepos.bh = bh;
1999
2000         /*
2001          * Do we have to copy current last extent to make space for indirect
2002          * one?
2003          */
2004         if (epos->offset + adsize > sb->s_blocksize) {
2005                 struct kernel_lb_addr cp_loc;
2006                 uint32_t cp_len;
2007                 int cp_type;
2008
2009                 epos->offset -= adsize;
2010                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2011                 cp_len |= ((uint32_t)cp_type) << 30;
2012
2013                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2014                 udf_write_aext(inode, epos, &nepos.block,
2015                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2016         } else {
2017                 __udf_add_aext(inode, epos, &nepos.block,
2018                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2019         }
2020
2021         brelse(epos->bh);
2022         *epos = nepos;
2023
2024         return 0;
2025 }
2026
2027 /*
2028  * Append extent at the given position - should be the first free one in inode
2029  * / indirect extent. This function assumes there is enough space in the inode
2030  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2031  */
2032 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2033                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2034 {
2035         struct udf_inode_info *iinfo = UDF_I(inode);
2036         struct allocExtDesc *aed;
2037         int adsize;
2038
2039         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2040                 adsize = sizeof(struct short_ad);
2041         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2042                 adsize = sizeof(struct long_ad);
2043         else
2044                 return -EIO;
2045
2046         if (!epos->bh) {
2047                 WARN_ON(iinfo->i_lenAlloc !=
2048                         epos->offset - udf_file_entry_alloc_offset(inode));
2049         } else {
2050                 aed = (struct allocExtDesc *)epos->bh->b_data;
2051                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2052                         epos->offset - sizeof(struct allocExtDesc));
2053                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2054         }
2055
2056         udf_write_aext(inode, epos, eloc, elen, inc);
2057
2058         if (!epos->bh) {
2059                 iinfo->i_lenAlloc += adsize;
2060                 mark_inode_dirty(inode);
2061         } else {
2062                 aed = (struct allocExtDesc *)epos->bh->b_data;
2063                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2064                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2065                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2066                         udf_update_tag(epos->bh->b_data,
2067                                         epos->offset + (inc ? 0 : adsize));
2068                 else
2069                         udf_update_tag(epos->bh->b_data,
2070                                         sizeof(struct allocExtDesc));
2071                 mark_buffer_dirty_inode(epos->bh, inode);
2072         }
2073
2074         return 0;
2075 }
2076
2077 /*
2078  * Append extent at given position - should be the first free one in inode
2079  * / indirect extent. Takes care of allocating and linking indirect blocks.
2080  */
2081 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2082                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2083 {
2084         int adsize;
2085         struct super_block *sb = inode->i_sb;
2086
2087         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2088                 adsize = sizeof(struct short_ad);
2089         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2090                 adsize = sizeof(struct long_ad);
2091         else
2092                 return -EIO;
2093
2094         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2095                 int err;
2096                 udf_pblk_t new_block;
2097
2098                 new_block = udf_new_block(sb, NULL,
2099                                           epos->block.partitionReferenceNum,
2100                                           epos->block.logicalBlockNum, &err);
2101                 if (!new_block)
2102                         return -ENOSPC;
2103
2104                 err = udf_setup_indirect_aext(inode, new_block, epos);
2105                 if (err)
2106                         return err;
2107         }
2108
2109         return __udf_add_aext(inode, epos, eloc, elen, inc);
2110 }
2111
2112 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2113                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2114 {
2115         int adsize;
2116         uint8_t *ptr;
2117         struct short_ad *sad;
2118         struct long_ad *lad;
2119         struct udf_inode_info *iinfo = UDF_I(inode);
2120
2121         if (!epos->bh)
2122                 ptr = iinfo->i_data + epos->offset -
2123                         udf_file_entry_alloc_offset(inode) +
2124                         iinfo->i_lenEAttr;
2125         else
2126                 ptr = epos->bh->b_data + epos->offset;
2127
2128         switch (iinfo->i_alloc_type) {
2129         case ICBTAG_FLAG_AD_SHORT:
2130                 sad = (struct short_ad *)ptr;
2131                 sad->extLength = cpu_to_le32(elen);
2132                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2133                 adsize = sizeof(struct short_ad);
2134                 break;
2135         case ICBTAG_FLAG_AD_LONG:
2136                 lad = (struct long_ad *)ptr;
2137                 lad->extLength = cpu_to_le32(elen);
2138                 lad->extLocation = cpu_to_lelb(*eloc);
2139                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2140                 adsize = sizeof(struct long_ad);
2141                 break;
2142         default:
2143                 return;
2144         }
2145
2146         if (epos->bh) {
2147                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2148                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2149                         struct allocExtDesc *aed =
2150                                 (struct allocExtDesc *)epos->bh->b_data;
2151                         udf_update_tag(epos->bh->b_data,
2152                                        le32_to_cpu(aed->lengthAllocDescs) +
2153                                        sizeof(struct allocExtDesc));
2154                 }
2155                 mark_buffer_dirty_inode(epos->bh, inode);
2156         } else {
2157                 mark_inode_dirty(inode);
2158         }
2159
2160         if (inc)
2161                 epos->offset += adsize;
2162 }
2163
2164 /*
2165  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2166  * someone does some weird stuff.
2167  */
2168 #define UDF_MAX_INDIR_EXTS 16
2169
2170 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2171                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2172 {
2173         int8_t etype;
2174         unsigned int indirections = 0;
2175
2176         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2177                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2178                 udf_pblk_t block;
2179
2180                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2181                         udf_err(inode->i_sb,
2182                                 "too many indirect extents in inode %lu\n",
2183                                 inode->i_ino);
2184                         return -1;
2185                 }
2186
2187                 epos->block = *eloc;
2188                 epos->offset = sizeof(struct allocExtDesc);
2189                 brelse(epos->bh);
2190                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2191                 epos->bh = sb_bread(inode->i_sb, block);
2192                 if (!epos->bh) {
2193                         udf_debug("reading block %u failed!\n", block);
2194                         return -1;
2195                 }
2196         }
2197
2198         return etype;
2199 }
2200
2201 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2202                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2203 {
2204         int alen;
2205         int8_t etype;
2206         uint8_t *ptr;
2207         struct short_ad *sad;
2208         struct long_ad *lad;
2209         struct udf_inode_info *iinfo = UDF_I(inode);
2210
2211         if (!epos->bh) {
2212                 if (!epos->offset)
2213                         epos->offset = udf_file_entry_alloc_offset(inode);
2214                 ptr = iinfo->i_data + epos->offset -
2215                         udf_file_entry_alloc_offset(inode) +
2216                         iinfo->i_lenEAttr;
2217                 alen = udf_file_entry_alloc_offset(inode) +
2218                                                         iinfo->i_lenAlloc;
2219         } else {
2220                 if (!epos->offset)
2221                         epos->offset = sizeof(struct allocExtDesc);
2222                 ptr = epos->bh->b_data + epos->offset;
2223                 alen = sizeof(struct allocExtDesc) +
2224                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2225                                                         lengthAllocDescs);
2226         }
2227
2228         switch (iinfo->i_alloc_type) {
2229         case ICBTAG_FLAG_AD_SHORT:
2230                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2231                 if (!sad)
2232                         return -1;
2233                 etype = le32_to_cpu(sad->extLength) >> 30;
2234                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2235                 eloc->partitionReferenceNum =
2236                                 iinfo->i_location.partitionReferenceNum;
2237                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2238                 break;
2239         case ICBTAG_FLAG_AD_LONG:
2240                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2241                 if (!lad)
2242                         return -1;
2243                 etype = le32_to_cpu(lad->extLength) >> 30;
2244                 *eloc = lelb_to_cpu(lad->extLocation);
2245                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2246                 break;
2247         default:
2248                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2249                 return -1;
2250         }
2251
2252         return etype;
2253 }
2254
2255 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2256                            struct kernel_lb_addr neloc, uint32_t nelen)
2257 {
2258         struct kernel_lb_addr oeloc;
2259         uint32_t oelen;
2260         int8_t etype;
2261         int err;
2262
2263         if (epos.bh)
2264                 get_bh(epos.bh);
2265
2266         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2267                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2268                 neloc = oeloc;
2269                 nelen = (etype << 30) | oelen;
2270         }
2271         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2272         brelse(epos.bh);
2273
2274         return err;
2275 }
2276
2277 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2278 {
2279         struct extent_position oepos;
2280         int adsize;
2281         int8_t etype;
2282         struct allocExtDesc *aed;
2283         struct udf_inode_info *iinfo;
2284         struct kernel_lb_addr eloc;
2285         uint32_t elen;
2286
2287         if (epos.bh) {
2288                 get_bh(epos.bh);
2289                 get_bh(epos.bh);
2290         }
2291
2292         iinfo = UDF_I(inode);
2293         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2294                 adsize = sizeof(struct short_ad);
2295         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2296                 adsize = sizeof(struct long_ad);
2297         else
2298                 adsize = 0;
2299
2300         oepos = epos;
2301         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2302                 return -1;
2303
2304         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2305                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2306                 if (oepos.bh != epos.bh) {
2307                         oepos.block = epos.block;
2308                         brelse(oepos.bh);
2309                         get_bh(epos.bh);
2310                         oepos.bh = epos.bh;
2311                         oepos.offset = epos.offset - adsize;
2312                 }
2313         }
2314         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2315         elen = 0;
2316
2317         if (epos.bh != oepos.bh) {
2318                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2319                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2320                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2321                 if (!oepos.bh) {
2322                         iinfo->i_lenAlloc -= (adsize * 2);
2323                         mark_inode_dirty(inode);
2324                 } else {
2325                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2326                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2327                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2328                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2329                                 udf_update_tag(oepos.bh->b_data,
2330                                                 oepos.offset - (2 * adsize));
2331                         else
2332                                 udf_update_tag(oepos.bh->b_data,
2333                                                 sizeof(struct allocExtDesc));
2334                         mark_buffer_dirty_inode(oepos.bh, inode);
2335                 }
2336         } else {
2337                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2338                 if (!oepos.bh) {
2339                         iinfo->i_lenAlloc -= adsize;
2340                         mark_inode_dirty(inode);
2341                 } else {
2342                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2343                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2344                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2345                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2346                                 udf_update_tag(oepos.bh->b_data,
2347                                                 epos.offset - adsize);
2348                         else
2349                                 udf_update_tag(oepos.bh->b_data,
2350                                                 sizeof(struct allocExtDesc));
2351                         mark_buffer_dirty_inode(oepos.bh, inode);
2352                 }
2353         }
2354
2355         brelse(epos.bh);
2356         brelse(oepos.bh);
2357
2358         return (elen >> 30);
2359 }
2360
2361 int8_t inode_bmap(struct inode *inode, sector_t block,
2362                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2363                   uint32_t *elen, sector_t *offset)
2364 {
2365         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2366         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2367         int8_t etype;
2368         struct udf_inode_info *iinfo;
2369
2370         iinfo = UDF_I(inode);
2371         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2372                 pos->offset = 0;
2373                 pos->block = iinfo->i_location;
2374                 pos->bh = NULL;
2375         }
2376         *elen = 0;
2377         do {
2378                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2379                 if (etype == -1) {
2380                         *offset = (bcount - lbcount) >> blocksize_bits;
2381                         iinfo->i_lenExtents = lbcount;
2382                         return -1;
2383                 }
2384                 lbcount += *elen;
2385         } while (lbcount <= bcount);
2386         /* update extent cache */
2387         udf_update_extent_cache(inode, lbcount - *elen, pos);
2388         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2389
2390         return etype;
2391 }