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
1251         iinfo = UDF_I(inode);
1252         if (newsize > inode->i_size) {
1253                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1254                         if (bsize >=
1255                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1256                                 down_write(&iinfo->i_data_sem);
1257                                 iinfo->i_lenAlloc = newsize;
1258                                 up_write(&iinfo->i_data_sem);
1259                                 goto set_size;
1260                         }
1261                         err = udf_expand_file_adinicb(inode);
1262                         if (err)
1263                                 return err;
1264                 }
1265                 err = udf_extend_file(inode, newsize);
1266                 if (err)
1267                         return err;
1268 set_size:
1269                 truncate_setsize(inode, newsize);
1270         } else {
1271                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1272                         down_write(&iinfo->i_data_sem);
1273                         udf_clear_extent_cache(inode);
1274                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1275                                0x00, bsize - newsize -
1276                                udf_file_entry_alloc_offset(inode));
1277                         iinfo->i_lenAlloc = newsize;
1278                         truncate_setsize(inode, newsize);
1279                         up_write(&iinfo->i_data_sem);
1280                         goto update_time;
1281                 }
1282                 err = block_truncate_page(inode->i_mapping, newsize,
1283                                           udf_get_block);
1284                 if (err)
1285                         return err;
1286                 truncate_setsize(inode, newsize);
1287                 down_write(&iinfo->i_data_sem);
1288                 udf_clear_extent_cache(inode);
1289                 err = udf_truncate_extents(inode);
1290                 up_write(&iinfo->i_data_sem);
1291                 if (err)
1292                         return err;
1293         }
1294 update_time:
1295         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1296         if (IS_SYNC(inode))
1297                 udf_sync_inode(inode);
1298         else
1299                 mark_inode_dirty(inode);
1300         return err;
1301 }
1302
1303 /*
1304  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1305  * arbitrary - just that we hopefully don't limit any real use of rewritten
1306  * inode on write-once media but avoid looping for too long on corrupted media.
1307  */
1308 #define UDF_MAX_ICB_NESTING 1024
1309
1310 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1311 {
1312         struct buffer_head *bh = NULL;
1313         struct fileEntry *fe;
1314         struct extendedFileEntry *efe;
1315         uint16_t ident;
1316         struct udf_inode_info *iinfo = UDF_I(inode);
1317         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1318         struct kernel_lb_addr *iloc = &iinfo->i_location;
1319         unsigned int link_count;
1320         unsigned int indirections = 0;
1321         int bs = inode->i_sb->s_blocksize;
1322         int ret = -EIO;
1323         uint32_t uid, gid;
1324         struct timespec64 ts;
1325
1326 reread:
1327         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1328                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1329                           iloc->partitionReferenceNum, sbi->s_partitions);
1330                 return -EIO;
1331         }
1332
1333         if (iloc->logicalBlockNum >=
1334             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1335                 udf_debug("block=%u, partition=%u out of range\n",
1336                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1337                 return -EIO;
1338         }
1339
1340         /*
1341          * Set defaults, but the inode is still incomplete!
1342          * Note: get_new_inode() sets the following on a new inode:
1343          *      i_sb = sb
1344          *      i_no = ino
1345          *      i_flags = sb->s_flags
1346          *      i_state = 0
1347          * clean_inode(): zero fills and sets
1348          *      i_count = 1
1349          *      i_nlink = 1
1350          *      i_op = NULL;
1351          */
1352         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1353         if (!bh) {
1354                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1355                 return -EIO;
1356         }
1357
1358         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1359             ident != TAG_IDENT_USE) {
1360                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1361                         inode->i_ino, ident);
1362                 goto out;
1363         }
1364
1365         fe = (struct fileEntry *)bh->b_data;
1366         efe = (struct extendedFileEntry *)bh->b_data;
1367
1368         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1369                 struct buffer_head *ibh;
1370
1371                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1372                 if (ident == TAG_IDENT_IE && ibh) {
1373                         struct kernel_lb_addr loc;
1374                         struct indirectEntry *ie;
1375
1376                         ie = (struct indirectEntry *)ibh->b_data;
1377                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1378
1379                         if (ie->indirectICB.extLength) {
1380                                 brelse(ibh);
1381                                 memcpy(&iinfo->i_location, &loc,
1382                                        sizeof(struct kernel_lb_addr));
1383                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1384                                         udf_err(inode->i_sb,
1385                                                 "too many ICBs in ICB hierarchy"
1386                                                 " (max %d supported)\n",
1387                                                 UDF_MAX_ICB_NESTING);
1388                                         goto out;
1389                                 }
1390                                 brelse(bh);
1391                                 goto reread;
1392                         }
1393                 }
1394                 brelse(ibh);
1395         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1396                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1397                         le16_to_cpu(fe->icbTag.strategyType));
1398                 goto out;
1399         }
1400         if (fe->icbTag.strategyType == cpu_to_le16(4))
1401                 iinfo->i_strat4096 = 0;
1402         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1403                 iinfo->i_strat4096 = 1;
1404
1405         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1406                                                         ICBTAG_FLAG_AD_MASK;
1407         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1408             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1409             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1410                 ret = -EIO;
1411                 goto out;
1412         }
1413         iinfo->i_hidden = hidden_inode;
1414         iinfo->i_unique = 0;
1415         iinfo->i_lenEAttr = 0;
1416         iinfo->i_lenExtents = 0;
1417         iinfo->i_lenAlloc = 0;
1418         iinfo->i_next_alloc_block = 0;
1419         iinfo->i_next_alloc_goal = 0;
1420         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1421                 iinfo->i_efe = 1;
1422                 iinfo->i_use = 0;
1423                 ret = udf_alloc_i_data(inode, bs -
1424                                         sizeof(struct extendedFileEntry));
1425                 if (ret)
1426                         goto out;
1427                 memcpy(iinfo->i_data,
1428                        bh->b_data + sizeof(struct extendedFileEntry),
1429                        bs - sizeof(struct extendedFileEntry));
1430         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1431                 iinfo->i_efe = 0;
1432                 iinfo->i_use = 0;
1433                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1434                 if (ret)
1435                         goto out;
1436                 memcpy(iinfo->i_data,
1437                        bh->b_data + sizeof(struct fileEntry),
1438                        bs - sizeof(struct fileEntry));
1439         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1440                 iinfo->i_efe = 0;
1441                 iinfo->i_use = 1;
1442                 iinfo->i_lenAlloc = le32_to_cpu(
1443                                 ((struct unallocSpaceEntry *)bh->b_data)->
1444                                  lengthAllocDescs);
1445                 ret = udf_alloc_i_data(inode, bs -
1446                                         sizeof(struct unallocSpaceEntry));
1447                 if (ret)
1448                         goto out;
1449                 memcpy(iinfo->i_data,
1450                        bh->b_data + sizeof(struct unallocSpaceEntry),
1451                        bs - sizeof(struct unallocSpaceEntry));
1452                 return 0;
1453         }
1454
1455         ret = -EIO;
1456         read_lock(&sbi->s_cred_lock);
1457         uid = le32_to_cpu(fe->uid);
1458         if (uid == UDF_INVALID_ID ||
1459             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1460                 inode->i_uid = sbi->s_uid;
1461         else
1462                 i_uid_write(inode, uid);
1463
1464         gid = le32_to_cpu(fe->gid);
1465         if (gid == UDF_INVALID_ID ||
1466             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1467                 inode->i_gid = sbi->s_gid;
1468         else
1469                 i_gid_write(inode, gid);
1470
1471         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1472                         sbi->s_fmode != UDF_INVALID_MODE)
1473                 inode->i_mode = sbi->s_fmode;
1474         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1475                         sbi->s_dmode != UDF_INVALID_MODE)
1476                 inode->i_mode = sbi->s_dmode;
1477         else
1478                 inode->i_mode = udf_convert_permissions(fe);
1479         inode->i_mode &= ~sbi->s_umask;
1480         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1481
1482         read_unlock(&sbi->s_cred_lock);
1483
1484         link_count = le16_to_cpu(fe->fileLinkCount);
1485         if (!link_count) {
1486                 if (!hidden_inode) {
1487                         ret = -ESTALE;
1488                         goto out;
1489                 }
1490                 link_count = 1;
1491         }
1492         set_nlink(inode, link_count);
1493
1494         inode->i_size = le64_to_cpu(fe->informationLength);
1495         iinfo->i_lenExtents = inode->i_size;
1496
1497         if (iinfo->i_efe == 0) {
1498                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1499                         (inode->i_sb->s_blocksize_bits - 9);
1500
1501                 udf_disk_stamp_to_time(&ts, fe->accessTime);
1502                 inode_set_atime_to_ts(inode, ts);
1503                 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1504                 inode_set_mtime_to_ts(inode, ts);
1505                 udf_disk_stamp_to_time(&ts, fe->attrTime);
1506                 inode_set_ctime_to_ts(inode, ts);
1507
1508                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1509                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1510                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1511                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1512                 iinfo->i_streamdir = 0;
1513                 iinfo->i_lenStreams = 0;
1514         } else {
1515                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1516                     (inode->i_sb->s_blocksize_bits - 9);
1517
1518                 udf_disk_stamp_to_time(&ts, efe->accessTime);
1519                 inode_set_atime_to_ts(inode, ts);
1520                 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1521                 inode_set_mtime_to_ts(inode, ts);
1522                 udf_disk_stamp_to_time(&ts, efe->attrTime);
1523                 inode_set_ctime_to_ts(inode, ts);
1524                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1525
1526                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1527                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1528                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1529                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1530
1531                 /* Named streams */
1532                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1533                 iinfo->i_locStreamdir =
1534                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1535                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1536                 if (iinfo->i_lenStreams >= inode->i_size)
1537                         iinfo->i_lenStreams -= inode->i_size;
1538                 else
1539                         iinfo->i_lenStreams = 0;
1540         }
1541         inode->i_generation = iinfo->i_unique;
1542
1543         /*
1544          * Sanity check length of allocation descriptors and extended attrs to
1545          * avoid integer overflows
1546          */
1547         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1548                 goto out;
1549         /* Now do exact checks */
1550         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1551                 goto out;
1552         /* Sanity checks for files in ICB so that we don't get confused later */
1553         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1554                 /*
1555                  * For file in ICB data is stored in allocation descriptor
1556                  * so sizes should match
1557                  */
1558                 if (iinfo->i_lenAlloc != inode->i_size)
1559                         goto out;
1560                 /* File in ICB has to fit in there... */
1561                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1562                         goto out;
1563         }
1564
1565         switch (fe->icbTag.fileType) {
1566         case ICBTAG_FILE_TYPE_DIRECTORY:
1567                 inode->i_op = &udf_dir_inode_operations;
1568                 inode->i_fop = &udf_dir_operations;
1569                 inode->i_mode |= S_IFDIR;
1570                 inc_nlink(inode);
1571                 break;
1572         case ICBTAG_FILE_TYPE_REALTIME:
1573         case ICBTAG_FILE_TYPE_REGULAR:
1574         case ICBTAG_FILE_TYPE_UNDEF:
1575         case ICBTAG_FILE_TYPE_VAT20:
1576                 inode->i_data.a_ops = &udf_aops;
1577                 inode->i_op = &udf_file_inode_operations;
1578                 inode->i_fop = &udf_file_operations;
1579                 inode->i_mode |= S_IFREG;
1580                 break;
1581         case ICBTAG_FILE_TYPE_BLOCK:
1582                 inode->i_mode |= S_IFBLK;
1583                 break;
1584         case ICBTAG_FILE_TYPE_CHAR:
1585                 inode->i_mode |= S_IFCHR;
1586                 break;
1587         case ICBTAG_FILE_TYPE_FIFO:
1588                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1589                 break;
1590         case ICBTAG_FILE_TYPE_SOCKET:
1591                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1592                 break;
1593         case ICBTAG_FILE_TYPE_SYMLINK:
1594                 inode->i_data.a_ops = &udf_symlink_aops;
1595                 inode->i_op = &udf_symlink_inode_operations;
1596                 inode_nohighmem(inode);
1597                 inode->i_mode = S_IFLNK | 0777;
1598                 break;
1599         case ICBTAG_FILE_TYPE_MAIN:
1600                 udf_debug("METADATA FILE-----\n");
1601                 break;
1602         case ICBTAG_FILE_TYPE_MIRROR:
1603                 udf_debug("METADATA MIRROR FILE-----\n");
1604                 break;
1605         case ICBTAG_FILE_TYPE_BITMAP:
1606                 udf_debug("METADATA BITMAP FILE-----\n");
1607                 break;
1608         default:
1609                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1610                         inode->i_ino, fe->icbTag.fileType);
1611                 goto out;
1612         }
1613         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1614                 struct deviceSpec *dsea =
1615                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1616                 if (dsea) {
1617                         init_special_inode(inode, inode->i_mode,
1618                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1619                                       le32_to_cpu(dsea->minorDeviceIdent)));
1620                         /* Developer ID ??? */
1621                 } else
1622                         goto out;
1623         }
1624         ret = 0;
1625 out:
1626         brelse(bh);
1627         return ret;
1628 }
1629
1630 static int udf_alloc_i_data(struct inode *inode, size_t size)
1631 {
1632         struct udf_inode_info *iinfo = UDF_I(inode);
1633         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1634         if (!iinfo->i_data)
1635                 return -ENOMEM;
1636         return 0;
1637 }
1638
1639 static umode_t udf_convert_permissions(struct fileEntry *fe)
1640 {
1641         umode_t mode;
1642         uint32_t permissions;
1643         uint32_t flags;
1644
1645         permissions = le32_to_cpu(fe->permissions);
1646         flags = le16_to_cpu(fe->icbTag.flags);
1647
1648         mode =  ((permissions) & 0007) |
1649                 ((permissions >> 2) & 0070) |
1650                 ((permissions >> 4) & 0700) |
1651                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1652                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1653                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1654
1655         return mode;
1656 }
1657
1658 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1659 {
1660         struct udf_inode_info *iinfo = UDF_I(inode);
1661
1662         /*
1663          * UDF 2.01 sec. 3.3.3.3 Note 2:
1664          * In Unix, delete permission tracks write
1665          */
1666         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1667         if (mode & 0200)
1668                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1669         if (mode & 0020)
1670                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1671         if (mode & 0002)
1672                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1673 }
1674
1675 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1676 {
1677         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1678 }
1679
1680 static int udf_sync_inode(struct inode *inode)
1681 {
1682         return udf_update_inode(inode, 1);
1683 }
1684
1685 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1686 {
1687         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1688             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1689              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1690                 iinfo->i_crtime = time;
1691 }
1692
1693 static int udf_update_inode(struct inode *inode, int do_sync)
1694 {
1695         struct buffer_head *bh = NULL;
1696         struct fileEntry *fe;
1697         struct extendedFileEntry *efe;
1698         uint64_t lb_recorded;
1699         uint32_t udfperms;
1700         uint16_t icbflags;
1701         uint16_t crclen;
1702         int err = 0;
1703         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1704         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1705         struct udf_inode_info *iinfo = UDF_I(inode);
1706
1707         bh = sb_getblk(inode->i_sb,
1708                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1709         if (!bh) {
1710                 udf_debug("getblk failure\n");
1711                 return -EIO;
1712         }
1713
1714         lock_buffer(bh);
1715         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1716         fe = (struct fileEntry *)bh->b_data;
1717         efe = (struct extendedFileEntry *)bh->b_data;
1718
1719         if (iinfo->i_use) {
1720                 struct unallocSpaceEntry *use =
1721                         (struct unallocSpaceEntry *)bh->b_data;
1722
1723                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1724                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1725                        iinfo->i_data, inode->i_sb->s_blocksize -
1726                                         sizeof(struct unallocSpaceEntry));
1727                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1728                 crclen = sizeof(struct unallocSpaceEntry);
1729
1730                 goto finish;
1731         }
1732
1733         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1734                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1735         else
1736                 fe->uid = cpu_to_le32(i_uid_read(inode));
1737
1738         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1739                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1740         else
1741                 fe->gid = cpu_to_le32(i_gid_read(inode));
1742
1743         udfperms = ((inode->i_mode & 0007)) |
1744                    ((inode->i_mode & 0070) << 2) |
1745                    ((inode->i_mode & 0700) << 4);
1746
1747         udfperms |= iinfo->i_extraPerms;
1748         fe->permissions = cpu_to_le32(udfperms);
1749
1750         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1751                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1752         else {
1753                 if (iinfo->i_hidden)
1754                         fe->fileLinkCount = cpu_to_le16(0);
1755                 else
1756                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1757         }
1758
1759         fe->informationLength = cpu_to_le64(inode->i_size);
1760
1761         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1762                 struct regid *eid;
1763                 struct deviceSpec *dsea =
1764                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1765                 if (!dsea) {
1766                         dsea = (struct deviceSpec *)
1767                                 udf_add_extendedattr(inode,
1768                                                      sizeof(struct deviceSpec) +
1769                                                      sizeof(struct regid), 12, 0x3);
1770                         dsea->attrType = cpu_to_le32(12);
1771                         dsea->attrSubtype = 1;
1772                         dsea->attrLength = cpu_to_le32(
1773                                                 sizeof(struct deviceSpec) +
1774                                                 sizeof(struct regid));
1775                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1776                 }
1777                 eid = (struct regid *)dsea->impUse;
1778                 memset(eid, 0, sizeof(*eid));
1779                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1780                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1781                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1782                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1783                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1784         }
1785
1786         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1787                 lb_recorded = 0; /* No extents => no blocks! */
1788         else
1789                 lb_recorded =
1790                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1791                         (blocksize_bits - 9);
1792
1793         if (iinfo->i_efe == 0) {
1794                 memcpy(bh->b_data + sizeof(struct fileEntry),
1795                        iinfo->i_data,
1796                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1797                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1798
1799                 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1800                 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
1801                 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1802                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1803                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1804                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1805                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1806                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1807                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1808                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1809                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1810                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1811                 crclen = sizeof(struct fileEntry);
1812         } else {
1813                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1814                        iinfo->i_data,
1815                        inode->i_sb->s_blocksize -
1816                                         sizeof(struct extendedFileEntry));
1817                 efe->objectSize =
1818                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1819                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1820
1821                 if (iinfo->i_streamdir) {
1822                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1823
1824                         icb_lad->extLocation =
1825                                 cpu_to_lelb(iinfo->i_locStreamdir);
1826                         icb_lad->extLength =
1827                                 cpu_to_le32(inode->i_sb->s_blocksize);
1828                 }
1829
1830                 udf_adjust_time(iinfo, inode_get_atime(inode));
1831                 udf_adjust_time(iinfo, inode_get_mtime(inode));
1832                 udf_adjust_time(iinfo, inode_get_ctime(inode));
1833
1834                 udf_time_to_disk_stamp(&efe->accessTime,
1835                                        inode_get_atime(inode));
1836                 udf_time_to_disk_stamp(&efe->modificationTime,
1837                                        inode_get_mtime(inode));
1838                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1839                 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1840
1841                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1842                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1843                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1844                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1845                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1846                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1847                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1848                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1849                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1850                 crclen = sizeof(struct extendedFileEntry);
1851         }
1852
1853 finish:
1854         if (iinfo->i_strat4096) {
1855                 fe->icbTag.strategyType = cpu_to_le16(4096);
1856                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1857                 fe->icbTag.numEntries = cpu_to_le16(2);
1858         } else {
1859                 fe->icbTag.strategyType = cpu_to_le16(4);
1860                 fe->icbTag.numEntries = cpu_to_le16(1);
1861         }
1862
1863         if (iinfo->i_use)
1864                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1865         else if (S_ISDIR(inode->i_mode))
1866                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1867         else if (S_ISREG(inode->i_mode))
1868                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1869         else if (S_ISLNK(inode->i_mode))
1870                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1871         else if (S_ISBLK(inode->i_mode))
1872                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1873         else if (S_ISCHR(inode->i_mode))
1874                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1875         else if (S_ISFIFO(inode->i_mode))
1876                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1877         else if (S_ISSOCK(inode->i_mode))
1878                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1879
1880         icbflags =      iinfo->i_alloc_type |
1881                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1882                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1883                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1884                         (le16_to_cpu(fe->icbTag.flags) &
1885                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1886                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1887
1888         fe->icbTag.flags = cpu_to_le16(icbflags);
1889         if (sbi->s_udfrev >= 0x0200)
1890                 fe->descTag.descVersion = cpu_to_le16(3);
1891         else
1892                 fe->descTag.descVersion = cpu_to_le16(2);
1893         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1894         fe->descTag.tagLocation = cpu_to_le32(
1895                                         iinfo->i_location.logicalBlockNum);
1896         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1897         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1898         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1899                                                   crclen));
1900         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1901
1902         set_buffer_uptodate(bh);
1903         unlock_buffer(bh);
1904
1905         /* write the data blocks */
1906         mark_buffer_dirty(bh);
1907         if (do_sync) {
1908                 sync_dirty_buffer(bh);
1909                 if (buffer_write_io_error(bh)) {
1910                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1911                                  inode->i_ino);
1912                         err = -EIO;
1913                 }
1914         }
1915         brelse(bh);
1916
1917         return err;
1918 }
1919
1920 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1921                          bool hidden_inode)
1922 {
1923         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1924         struct inode *inode = iget_locked(sb, block);
1925         int err;
1926
1927         if (!inode)
1928                 return ERR_PTR(-ENOMEM);
1929
1930         if (!(inode->i_state & I_NEW)) {
1931                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1932                         iput(inode);
1933                         return ERR_PTR(-EFSCORRUPTED);
1934                 }
1935                 return inode;
1936         }
1937
1938         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1939         err = udf_read_inode(inode, hidden_inode);
1940         if (err < 0) {
1941                 iget_failed(inode);
1942                 return ERR_PTR(err);
1943         }
1944         unlock_new_inode(inode);
1945
1946         return inode;
1947 }
1948
1949 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1950                             struct extent_position *epos)
1951 {
1952         struct super_block *sb = inode->i_sb;
1953         struct buffer_head *bh;
1954         struct allocExtDesc *aed;
1955         struct extent_position nepos;
1956         struct kernel_lb_addr neloc;
1957         int ver, adsize;
1958
1959         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1960                 adsize = sizeof(struct short_ad);
1961         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1962                 adsize = sizeof(struct long_ad);
1963         else
1964                 return -EIO;
1965
1966         neloc.logicalBlockNum = block;
1967         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1968
1969         bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1970         if (!bh)
1971                 return -EIO;
1972         lock_buffer(bh);
1973         memset(bh->b_data, 0x00, sb->s_blocksize);
1974         set_buffer_uptodate(bh);
1975         unlock_buffer(bh);
1976         mark_buffer_dirty_inode(bh, inode);
1977
1978         aed = (struct allocExtDesc *)(bh->b_data);
1979         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1980                 aed->previousAllocExtLocation =
1981                                 cpu_to_le32(epos->block.logicalBlockNum);
1982         }
1983         aed->lengthAllocDescs = cpu_to_le32(0);
1984         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1985                 ver = 3;
1986         else
1987                 ver = 2;
1988         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1989                     sizeof(struct tag));
1990
1991         nepos.block = neloc;
1992         nepos.offset = sizeof(struct allocExtDesc);
1993         nepos.bh = bh;
1994
1995         /*
1996          * Do we have to copy current last extent to make space for indirect
1997          * one?
1998          */
1999         if (epos->offset + adsize > sb->s_blocksize) {
2000                 struct kernel_lb_addr cp_loc;
2001                 uint32_t cp_len;
2002                 int cp_type;
2003
2004                 epos->offset -= adsize;
2005                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2006                 cp_len |= ((uint32_t)cp_type) << 30;
2007
2008                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2009                 udf_write_aext(inode, epos, &nepos.block,
2010                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2011         } else {
2012                 __udf_add_aext(inode, epos, &nepos.block,
2013                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2014         }
2015
2016         brelse(epos->bh);
2017         *epos = nepos;
2018
2019         return 0;
2020 }
2021
2022 /*
2023  * Append extent at the given position - should be the first free one in inode
2024  * / indirect extent. This function assumes there is enough space in the inode
2025  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2026  */
2027 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2028                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2029 {
2030         struct udf_inode_info *iinfo = UDF_I(inode);
2031         struct allocExtDesc *aed;
2032         int adsize;
2033
2034         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2035                 adsize = sizeof(struct short_ad);
2036         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2037                 adsize = sizeof(struct long_ad);
2038         else
2039                 return -EIO;
2040
2041         if (!epos->bh) {
2042                 WARN_ON(iinfo->i_lenAlloc !=
2043                         epos->offset - udf_file_entry_alloc_offset(inode));
2044         } else {
2045                 aed = (struct allocExtDesc *)epos->bh->b_data;
2046                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2047                         epos->offset - sizeof(struct allocExtDesc));
2048                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2049         }
2050
2051         udf_write_aext(inode, epos, eloc, elen, inc);
2052
2053         if (!epos->bh) {
2054                 iinfo->i_lenAlloc += adsize;
2055                 mark_inode_dirty(inode);
2056         } else {
2057                 aed = (struct allocExtDesc *)epos->bh->b_data;
2058                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2059                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2060                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2061                         udf_update_tag(epos->bh->b_data,
2062                                         epos->offset + (inc ? 0 : adsize));
2063                 else
2064                         udf_update_tag(epos->bh->b_data,
2065                                         sizeof(struct allocExtDesc));
2066                 mark_buffer_dirty_inode(epos->bh, inode);
2067         }
2068
2069         return 0;
2070 }
2071
2072 /*
2073  * Append extent at given position - should be the first free one in inode
2074  * / indirect extent. Takes care of allocating and linking indirect blocks.
2075  */
2076 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2077                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2078 {
2079         int adsize;
2080         struct super_block *sb = inode->i_sb;
2081
2082         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2083                 adsize = sizeof(struct short_ad);
2084         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2085                 adsize = sizeof(struct long_ad);
2086         else
2087                 return -EIO;
2088
2089         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2090                 int err;
2091                 udf_pblk_t new_block;
2092
2093                 new_block = udf_new_block(sb, NULL,
2094                                           epos->block.partitionReferenceNum,
2095                                           epos->block.logicalBlockNum, &err);
2096                 if (!new_block)
2097                         return -ENOSPC;
2098
2099                 err = udf_setup_indirect_aext(inode, new_block, epos);
2100                 if (err)
2101                         return err;
2102         }
2103
2104         return __udf_add_aext(inode, epos, eloc, elen, inc);
2105 }
2106
2107 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2108                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2109 {
2110         int adsize;
2111         uint8_t *ptr;
2112         struct short_ad *sad;
2113         struct long_ad *lad;
2114         struct udf_inode_info *iinfo = UDF_I(inode);
2115
2116         if (!epos->bh)
2117                 ptr = iinfo->i_data + epos->offset -
2118                         udf_file_entry_alloc_offset(inode) +
2119                         iinfo->i_lenEAttr;
2120         else
2121                 ptr = epos->bh->b_data + epos->offset;
2122
2123         switch (iinfo->i_alloc_type) {
2124         case ICBTAG_FLAG_AD_SHORT:
2125                 sad = (struct short_ad *)ptr;
2126                 sad->extLength = cpu_to_le32(elen);
2127                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2128                 adsize = sizeof(struct short_ad);
2129                 break;
2130         case ICBTAG_FLAG_AD_LONG:
2131                 lad = (struct long_ad *)ptr;
2132                 lad->extLength = cpu_to_le32(elen);
2133                 lad->extLocation = cpu_to_lelb(*eloc);
2134                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2135                 adsize = sizeof(struct long_ad);
2136                 break;
2137         default:
2138                 return;
2139         }
2140
2141         if (epos->bh) {
2142                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2143                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2144                         struct allocExtDesc *aed =
2145                                 (struct allocExtDesc *)epos->bh->b_data;
2146                         udf_update_tag(epos->bh->b_data,
2147                                        le32_to_cpu(aed->lengthAllocDescs) +
2148                                        sizeof(struct allocExtDesc));
2149                 }
2150                 mark_buffer_dirty_inode(epos->bh, inode);
2151         } else {
2152                 mark_inode_dirty(inode);
2153         }
2154
2155         if (inc)
2156                 epos->offset += adsize;
2157 }
2158
2159 /*
2160  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2161  * someone does some weird stuff.
2162  */
2163 #define UDF_MAX_INDIR_EXTS 16
2164
2165 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2166                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2167 {
2168         int8_t etype;
2169         unsigned int indirections = 0;
2170
2171         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2172                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2173                 udf_pblk_t block;
2174
2175                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2176                         udf_err(inode->i_sb,
2177                                 "too many indirect extents in inode %lu\n",
2178                                 inode->i_ino);
2179                         return -1;
2180                 }
2181
2182                 epos->block = *eloc;
2183                 epos->offset = sizeof(struct allocExtDesc);
2184                 brelse(epos->bh);
2185                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2186                 epos->bh = sb_bread(inode->i_sb, block);
2187                 if (!epos->bh) {
2188                         udf_debug("reading block %u failed!\n", block);
2189                         return -1;
2190                 }
2191         }
2192
2193         return etype;
2194 }
2195
2196 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2197                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2198 {
2199         int alen;
2200         int8_t etype;
2201         uint8_t *ptr;
2202         struct short_ad *sad;
2203         struct long_ad *lad;
2204         struct udf_inode_info *iinfo = UDF_I(inode);
2205
2206         if (!epos->bh) {
2207                 if (!epos->offset)
2208                         epos->offset = udf_file_entry_alloc_offset(inode);
2209                 ptr = iinfo->i_data + epos->offset -
2210                         udf_file_entry_alloc_offset(inode) +
2211                         iinfo->i_lenEAttr;
2212                 alen = udf_file_entry_alloc_offset(inode) +
2213                                                         iinfo->i_lenAlloc;
2214         } else {
2215                 if (!epos->offset)
2216                         epos->offset = sizeof(struct allocExtDesc);
2217                 ptr = epos->bh->b_data + epos->offset;
2218                 alen = sizeof(struct allocExtDesc) +
2219                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2220                                                         lengthAllocDescs);
2221         }
2222
2223         switch (iinfo->i_alloc_type) {
2224         case ICBTAG_FLAG_AD_SHORT:
2225                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2226                 if (!sad)
2227                         return -1;
2228                 etype = le32_to_cpu(sad->extLength) >> 30;
2229                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2230                 eloc->partitionReferenceNum =
2231                                 iinfo->i_location.partitionReferenceNum;
2232                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2233                 break;
2234         case ICBTAG_FLAG_AD_LONG:
2235                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2236                 if (!lad)
2237                         return -1;
2238                 etype = le32_to_cpu(lad->extLength) >> 30;
2239                 *eloc = lelb_to_cpu(lad->extLocation);
2240                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2241                 break;
2242         default:
2243                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2244                 return -1;
2245         }
2246
2247         return etype;
2248 }
2249
2250 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2251                            struct kernel_lb_addr neloc, uint32_t nelen)
2252 {
2253         struct kernel_lb_addr oeloc;
2254         uint32_t oelen;
2255         int8_t etype;
2256         int err;
2257
2258         if (epos.bh)
2259                 get_bh(epos.bh);
2260
2261         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2262                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2263                 neloc = oeloc;
2264                 nelen = (etype << 30) | oelen;
2265         }
2266         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2267         brelse(epos.bh);
2268
2269         return err;
2270 }
2271
2272 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2273 {
2274         struct extent_position oepos;
2275         int adsize;
2276         int8_t etype;
2277         struct allocExtDesc *aed;
2278         struct udf_inode_info *iinfo;
2279         struct kernel_lb_addr eloc;
2280         uint32_t elen;
2281
2282         if (epos.bh) {
2283                 get_bh(epos.bh);
2284                 get_bh(epos.bh);
2285         }
2286
2287         iinfo = UDF_I(inode);
2288         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2289                 adsize = sizeof(struct short_ad);
2290         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2291                 adsize = sizeof(struct long_ad);
2292         else
2293                 adsize = 0;
2294
2295         oepos = epos;
2296         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2297                 return -1;
2298
2299         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2300                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2301                 if (oepos.bh != epos.bh) {
2302                         oepos.block = epos.block;
2303                         brelse(oepos.bh);
2304                         get_bh(epos.bh);
2305                         oepos.bh = epos.bh;
2306                         oepos.offset = epos.offset - adsize;
2307                 }
2308         }
2309         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2310         elen = 0;
2311
2312         if (epos.bh != oepos.bh) {
2313                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2314                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2315                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2316                 if (!oepos.bh) {
2317                         iinfo->i_lenAlloc -= (adsize * 2);
2318                         mark_inode_dirty(inode);
2319                 } else {
2320                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2321                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2322                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2323                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2324                                 udf_update_tag(oepos.bh->b_data,
2325                                                 oepos.offset - (2 * adsize));
2326                         else
2327                                 udf_update_tag(oepos.bh->b_data,
2328                                                 sizeof(struct allocExtDesc));
2329                         mark_buffer_dirty_inode(oepos.bh, inode);
2330                 }
2331         } else {
2332                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2333                 if (!oepos.bh) {
2334                         iinfo->i_lenAlloc -= adsize;
2335                         mark_inode_dirty(inode);
2336                 } else {
2337                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2338                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2339                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2340                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2341                                 udf_update_tag(oepos.bh->b_data,
2342                                                 epos.offset - adsize);
2343                         else
2344                                 udf_update_tag(oepos.bh->b_data,
2345                                                 sizeof(struct allocExtDesc));
2346                         mark_buffer_dirty_inode(oepos.bh, inode);
2347                 }
2348         }
2349
2350         brelse(epos.bh);
2351         brelse(oepos.bh);
2352
2353         return (elen >> 30);
2354 }
2355
2356 int8_t inode_bmap(struct inode *inode, sector_t block,
2357                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2358                   uint32_t *elen, sector_t *offset)
2359 {
2360         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2361         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2362         int8_t etype;
2363         struct udf_inode_info *iinfo;
2364
2365         iinfo = UDF_I(inode);
2366         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2367                 pos->offset = 0;
2368                 pos->block = iinfo->i_location;
2369                 pos->bh = NULL;
2370         }
2371         *elen = 0;
2372         do {
2373                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2374                 if (etype == -1) {
2375                         *offset = (bcount - lbcount) >> blocksize_bits;
2376                         iinfo->i_lenExtents = lbcount;
2377                         return -1;
2378                 }
2379                 lbcount += *elen;
2380         } while (lbcount <= bcount);
2381         /* update extent cache */
2382         udf_update_extent_cache(inode, lbcount - *elen, pos);
2383         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2384
2385         return etype;
2386 }