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_readpage(struct page *page)
 212 {
 213         struct inode *inode = page->mapping->host;
 214         char *kaddr;
 215         struct udf_inode_info *iinfo = UDF_I(inode);
 216         loff_t isize = i_size_read(inode);
 217
 218         kaddr = kmap_local_page(page);
 219         memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr, isize);
 220         memset(kaddr + isize, 0, PAGE_SIZE - isize);
 221         flush_dcache_page(page);
 222         SetPageUptodate(page);
 223         kunmap_local(kaddr);
 224 }
 225
 226 static int udf_read_folio(struct file *file, struct folio *folio)
 227 {
 228         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 229
 230         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 231                 udf_adinicb_readpage(&folio->page);
 232                 folio_unlock(folio);
 233                 return 0;
 234         }
 235         return mpage_read_folio(folio, udf_get_block);
 236 }
 237
 238 static void udf_readahead(struct readahead_control *rac)
 239 {
 240         struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
 241
 242         /*
 243          * No readahead needed for in-ICB files and udf_get_block() would get
 244          * confused for such file anyway.
 245          */
 246         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 247                 return;
 248
 249         mpage_readahead(rac, udf_get_block);
 250 }
 251
 252 static int udf_write_begin(struct file *file, struct address_space *mapping,
 253                            loff_t pos, unsigned len,
 254                            struct page **pagep, void **fsdata)
 255 {
 256         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 257         struct page *page;
 258         int ret;
 259
 260         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 261                 ret = block_write_begin(mapping, pos, len, pagep,
 262                                         udf_get_block);
 263                 if (unlikely(ret))
 264                         udf_write_failed(mapping, pos + len);
 265                 return ret;
 266         }
 267         if (WARN_ON_ONCE(pos >= PAGE_SIZE))
 268                 return -EIO;
 269         page = grab_cache_page_write_begin(mapping, 0);
 270         if (!page)
 271                 return -ENOMEM;
 272         *pagep = page;
 273         if (!PageUptodate(page))
 274                 udf_adinicb_readpage(page);
 275         return 0;
 276 }
 277
 278 static int udf_write_end(struct file *file, struct address_space *mapping,
 279                          loff_t pos, unsigned len, unsigned copied,
 280                          struct page *page, void *fsdata)
 281 {
 282         struct inode *inode = file_inode(file);
 283         loff_t last_pos;
 284
 285         if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 286                 return generic_write_end(file, mapping, pos, len, copied, page,
 287                                          fsdata);
 288         last_pos = pos + copied;
 289         if (last_pos > inode->i_size)
 290                 i_size_write(inode, last_pos);
 291         set_page_dirty(page);
 292         unlock_page(page);
 293         put_page(page);
 294
 295         return copied;
 296 }
 297
 298 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 299 {
 300         struct file *file = iocb->ki_filp;
 301         struct address_space *mapping = file->f_mapping;
 302         struct inode *inode = mapping->host;
 303         size_t count = iov_iter_count(iter);
 304         ssize_t ret;
 305
 306         /* Fallback to buffered IO for in-ICB files */
 307         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 308                 return 0;
 309         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 310         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 311                 udf_write_failed(mapping, iocb->ki_pos + count);
 312         return ret;
 313 }
 314
 315 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 316 {
 317         struct udf_inode_info *iinfo = UDF_I(mapping->host);
 318
 319         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 320                 return -EINVAL;
 321         return generic_block_bmap(mapping, block, udf_get_block);
 322 }
 323
 324 const struct address_space_operations udf_aops = {
 325         .dirty_folio    = block_dirty_folio,
 326         .invalidate_folio = block_invalidate_folio,
 327         .read_folio     = udf_read_folio,
 328         .readahead      = udf_readahead,
 329         .writepages     = udf_writepages,
 330         .write_begin    = udf_write_begin,
 331         .write_end      = udf_write_end,
 332         .direct_IO      = udf_direct_IO,
 333         .bmap           = udf_bmap,
 334         .migrate_folio  = buffer_migrate_folio,
 335 };
 336
 337 /*
 338  * Expand file stored in ICB to a normal one-block-file
 339  *
 340  * This function requires i_mutex held
 341  */
 342 int udf_expand_file_adinicb(struct inode *inode)
 343 {
 344         struct page *page;
 345         struct udf_inode_info *iinfo = UDF_I(inode);
 346         int err;
 347
 348         WARN_ON_ONCE(!inode_is_locked(inode));
 349         if (!iinfo->i_lenAlloc) {
 350                 down_write(&iinfo->i_data_sem);
 351                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 352                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 353                 else
 354                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 355                 up_write(&iinfo->i_data_sem);
 356                 mark_inode_dirty(inode);
 357                 return 0;
 358         }
 359
 360         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 361         if (!page)
 362                 return -ENOMEM;
 363
 364         if (!PageUptodate(page))
 365                 udf_adinicb_readpage(page);
 366         down_write(&iinfo->i_data_sem);
 367         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 368                iinfo->i_lenAlloc);
 369         iinfo->i_lenAlloc = 0;
 370         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 371                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 372         else
 373                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 374         set_page_dirty(page);
 375         unlock_page(page);
 376         up_write(&iinfo->i_data_sem);
 377         err = filemap_fdatawrite(inode->i_mapping);
 378         if (err) {
 379                 /* Restore everything back so that we don't lose data... */
 380                 lock_page(page);
 381                 down_write(&iinfo->i_data_sem);
 382                 memcpy_to_page(page, 0, iinfo->i_data + iinfo->i_lenEAttr,
 383                                inode->i_size);
 384                 unlock_page(page);
 385                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 386                 iinfo->i_lenAlloc = inode->i_size;
 387                 up_write(&iinfo->i_data_sem);
 388         }
 389         put_page(page);
 390         mark_inode_dirty(inode);
 391
 392         return err;
 393 }
 394
 395 #define UDF_MAP_CREATE          0x01    /* Mapping can allocate new blocks */
 396 #define UDF_MAP_NOPREALLOC      0x02    /* Do not preallocate blocks */
 397
 398 #define UDF_BLK_MAPPED  0x01    /* Block was successfully mapped */
 399 #define UDF_BLK_NEW     0x02    /* Block was freshly allocated */
 400
 401 struct udf_map_rq {
 402         sector_t lblk;
 403         udf_pblk_t pblk;
 404         int iflags;             /* UDF_MAP_ flags determining behavior */
 405         int oflags;             /* UDF_BLK_ flags reporting results */
 406 };
 407
 408 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
 409 {
 410         int err;
 411         struct udf_inode_info *iinfo = UDF_I(inode);
 412
 413         if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
 414                 return -EFSCORRUPTED;
 415
 416         map->oflags = 0;
 417         if (!(map->iflags & UDF_MAP_CREATE)) {
 418                 struct kernel_lb_addr eloc;
 419                 uint32_t elen;
 420                 sector_t offset;
 421                 struct extent_position epos = {};
 422
 423                 down_read(&iinfo->i_data_sem);
 424                 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
 425                                 == (EXT_RECORDED_ALLOCATED >> 30)) {
 426                         map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
 427                                                         offset);
 428                         map->oflags |= UDF_BLK_MAPPED;
 429                 }
 430                 up_read(&iinfo->i_data_sem);
 431                 brelse(epos.bh);
 432
 433                 return 0;
 434         }
 435
 436         down_write(&iinfo->i_data_sem);
 437         /*
 438          * Block beyond EOF and prealloc extents? Just discard preallocation
 439          * as it is not useful and complicates things.
 440          */
 441         if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
 442                 udf_discard_prealloc(inode);
 443         udf_clear_extent_cache(inode);
 444         err = inode_getblk(inode, map);
 445         up_write(&iinfo->i_data_sem);
 446         return err;
 447 }
 448
 449 static int __udf_get_block(struct inode *inode, sector_t block,
 450                            struct buffer_head *bh_result, int flags)
 451 {
 452         int err;
 453         struct udf_map_rq map = {
 454                 .lblk = block,
 455                 .iflags = flags,
 456         };
 457
 458         err = udf_map_block(inode, &map);
 459         if (err < 0)
 460                 return err;
 461         if (map.oflags & UDF_BLK_MAPPED) {
 462                 map_bh(bh_result, inode->i_sb, map.pblk);
 463                 if (map.oflags & UDF_BLK_NEW)
 464                         set_buffer_new(bh_result);
 465         }
 466         return 0;
 467 }
 468
 469 int udf_get_block(struct inode *inode, sector_t block,
 470                   struct buffer_head *bh_result, int create)
 471 {
 472         int flags = create ? UDF_MAP_CREATE : 0;
 473
 474         /*
 475          * We preallocate blocks only for regular files. It also makes sense
 476          * for directories but there's a problem when to drop the
 477          * preallocation. We might use some delayed work for that but I feel
 478          * it's overengineering for a filesystem like UDF.
 479          */
 480         if (!S_ISREG(inode->i_mode))
 481                 flags |= UDF_MAP_NOPREALLOC;
 482         return __udf_get_block(inode, block, bh_result, flags);
 483 }
 484
 485 /*
 486  * We shouldn't be allocating blocks on page writeback since we allocate them
 487  * on page fault. We can spot dirty buffers without allocated blocks though
 488  * when truncate expands file. These however don't have valid data so we can
 489  * safely ignore them. So never allocate blocks from page writeback.
 490  */
 491 static int udf_get_block_wb(struct inode *inode, sector_t block,
 492                             struct buffer_head *bh_result, int create)
 493 {
 494         return __udf_get_block(inode, block, bh_result, 0);
 495 }
 496
 497 /* Extend the file with new blocks totaling 'new_block_bytes',
 498  * return the number of extents added
 499  */
 500 static int udf_do_extend_file(struct inode *inode,
 501                               struct extent_position *last_pos,
 502                               struct kernel_long_ad *last_ext,
 503                               loff_t new_block_bytes)
 504 {
 505         uint32_t add;
 506         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 507         struct super_block *sb = inode->i_sb;
 508         struct udf_inode_info *iinfo;
 509         int err;
 510
 511         /* The previous extent is fake and we should not extend by anything
 512          * - there's nothing to do... */
 513         if (!new_block_bytes && fake)
 514                 return 0;
 515
 516         iinfo = UDF_I(inode);
 517         /* Round the last extent up to a multiple of block size */
 518         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 519                 last_ext->extLength =
 520                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 521                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 522                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 523                 iinfo->i_lenExtents =
 524                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 525                         ~(sb->s_blocksize - 1);
 526         }
 527
 528         add = 0;
 529         /* Can we merge with the previous extent? */
 530         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 531                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 532                 add = (1 << 30) - sb->s_blocksize -
 533                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 534                 if (add > new_block_bytes)
 535                         add = new_block_bytes;
 536                 new_block_bytes -= add;
 537                 last_ext->extLength += add;
 538         }
 539
 540         if (fake) {
 541                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 542                                    last_ext->extLength, 1);
 543                 if (err < 0)
 544                         goto out_err;
 545                 count++;
 546         } else {
 547                 struct kernel_lb_addr tmploc;
 548                 uint32_t tmplen;
 549
 550                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 551                                 last_ext->extLength, 1);
 552
 553                 /*
 554                  * We've rewritten the last extent. If we are going to add
 555                  * more extents, we may need to enter possible following
 556                  * empty indirect extent.
 557                  */
 558                 if (new_block_bytes)
 559                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 560         }
 561         iinfo->i_lenExtents += add;
 562
 563         /* Managed to do everything necessary? */
 564         if (!new_block_bytes)
 565                 goto out;
 566
 567         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 568         last_ext->extLocation.logicalBlockNum = 0;
 569         last_ext->extLocation.partitionReferenceNum = 0;
 570         add = (1 << 30) - sb->s_blocksize;
 571         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 572
 573         /* Create enough extents to cover the whole hole */
 574         while (new_block_bytes > add) {
 575                 new_block_bytes -= add;
 576                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 577                                    last_ext->extLength, 1);
 578                 if (err)
 579                         goto out_err;
 580                 iinfo->i_lenExtents += add;
 581                 count++;
 582         }
 583         if (new_block_bytes) {
 584                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 585                         new_block_bytes;
 586                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 587                                    last_ext->extLength, 1);
 588                 if (err)
 589                         goto out_err;
 590                 iinfo->i_lenExtents += new_block_bytes;
 591                 count++;
 592         }
 593
 594 out:
 595         /* last_pos should point to the last written extent... */
 596         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 597                 last_pos->offset -= sizeof(struct short_ad);
 598         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 599                 last_pos->offset -= sizeof(struct long_ad);
 600         else
 601                 return -EIO;
 602
 603         return count;
 604 out_err:
 605         /* Remove extents we've created so far */
 606         udf_clear_extent_cache(inode);
 607         udf_truncate_extents(inode);
 608         return err;
 609 }
 610
 611 /* Extend the final block of the file to final_block_len bytes */
 612 static void udf_do_extend_final_block(struct inode *inode,
 613                                       struct extent_position *last_pos,
 614                                       struct kernel_long_ad *last_ext,
 615                                       uint32_t new_elen)
 616 {
 617         uint32_t added_bytes;
 618
 619         /*
 620          * Extent already large enough? It may be already rounded up to block
 621          * size...
 622          */
 623         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 624                 return;
 625         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 626         last_ext->extLength += added_bytes;
 627         UDF_I(inode)->i_lenExtents += added_bytes;
 628
 629         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 630                         last_ext->extLength, 1);
 631 }
 632
 633 static int udf_extend_file(struct inode *inode, loff_t newsize)
 634 {
 635
 636         struct extent_position epos;
 637         struct kernel_lb_addr eloc;
 638         uint32_t elen;
 639         int8_t etype;
 640         struct super_block *sb = inode->i_sb;
 641         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 642         loff_t new_elen;
 643         int adsize;
 644         struct udf_inode_info *iinfo = UDF_I(inode);
 645         struct kernel_long_ad extent;
 646         int err = 0;
 647         bool within_last_ext;
 648
 649         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 650                 adsize = sizeof(struct short_ad);
 651         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 652                 adsize = sizeof(struct long_ad);
 653         else
 654                 BUG();
 655
 656         down_write(&iinfo->i_data_sem);
 657         /*
 658          * When creating hole in file, just don't bother with preserving
 659          * preallocation. It likely won't be very useful anyway.
 660          */
 661         udf_discard_prealloc(inode);
 662
 663         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 664         within_last_ext = (etype != -1);
 665         /* We don't expect extents past EOF... */
 666         WARN_ON_ONCE(within_last_ext &&
 667                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 668
 669         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 670             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 671                 /* File has no extents at all or has empty last
 672                  * indirect extent! Create a fake extent... */
 673                 extent.extLocation.logicalBlockNum = 0;
 674                 extent.extLocation.partitionReferenceNum = 0;
 675                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 676         } else {
 677                 epos.offset -= adsize;
 678                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 679                                       &extent.extLength, 0);
 680                 extent.extLength |= etype << 30;
 681         }
 682
 683         new_elen = ((loff_t)offset << inode->i_blkbits) |
 684                                         (newsize & (sb->s_blocksize - 1));
 685
 686         /* File has extent covering the new size (could happen when extending
 687          * inside a block)?
 688          */
 689         if (within_last_ext) {
 690                 /* Extending file within the last file block */
 691                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 692         } else {
 693                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 694         }
 695
 696         if (err < 0)
 697                 goto out;
 698         err = 0;
 699 out:
 700         brelse(epos.bh);
 701         up_write(&iinfo->i_data_sem);
 702         return err;
 703 }
 704
 705 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
 706 {
 707         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 708         struct extent_position prev_epos, cur_epos, next_epos;
 709         int count = 0, startnum = 0, endnum = 0;
 710         uint32_t elen = 0, tmpelen;
 711         struct kernel_lb_addr eloc, tmpeloc;
 712         int c = 1;
 713         loff_t lbcount = 0, b_off = 0;
 714         udf_pblk_t newblocknum;
 715         sector_t offset = 0;
 716         int8_t etype;
 717         struct udf_inode_info *iinfo = UDF_I(inode);
 718         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 719         int lastblock = 0;
 720         bool isBeyondEOF;
 721         int ret = 0;
 722
 723         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 724         prev_epos.block = iinfo->i_location;
 725         prev_epos.bh = NULL;
 726         cur_epos = next_epos = prev_epos;
 727         b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
 728
 729         /* find the extent which contains the block we are looking for.
 730            alternate between laarr[0] and laarr[1] for locations of the
 731            current extent, and the previous extent */
 732         do {
 733                 if (prev_epos.bh != cur_epos.bh) {
 734                         brelse(prev_epos.bh);
 735                         get_bh(cur_epos.bh);
 736                         prev_epos.bh = cur_epos.bh;
 737                 }
 738                 if (cur_epos.bh != next_epos.bh) {
 739                         brelse(cur_epos.bh);
 740                         get_bh(next_epos.bh);
 741                         cur_epos.bh = next_epos.bh;
 742                 }
 743
 744                 lbcount += elen;
 745
 746                 prev_epos.block = cur_epos.block;
 747                 cur_epos.block = next_epos.block;
 748
 749                 prev_epos.offset = cur_epos.offset;
 750                 cur_epos.offset = next_epos.offset;
 751
 752                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 753                 if (etype == -1)
 754                         break;
 755
 756                 c = !c;
 757
 758                 laarr[c].extLength = (etype << 30) | elen;
 759                 laarr[c].extLocation = eloc;
 760
 761                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 762                         pgoal = eloc.logicalBlockNum +
 763                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 764                                  inode->i_sb->s_blocksize_bits);
 765
 766                 count++;
 767         } while (lbcount + elen <= b_off);
 768
 769         b_off -= lbcount;
 770         offset = b_off >> inode->i_sb->s_blocksize_bits;
 771         /*
 772          * Move prev_epos and cur_epos into indirect extent if we are at
 773          * the pointer to it
 774          */
 775         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 776         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 777
 778         /* if the extent is allocated and recorded, return the block
 779            if the extent is not a multiple of the blocksize, round up */
 780
 781         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 782                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 783                         elen = EXT_RECORDED_ALLOCATED |
 784                                 ((elen + inode->i_sb->s_blocksize - 1) &
 785                                  ~(inode->i_sb->s_blocksize - 1));
 786                         iinfo->i_lenExtents =
 787                                 ALIGN(iinfo->i_lenExtents,
 788                                       inode->i_sb->s_blocksize);
 789                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 790                 }
 791                 map->oflags = UDF_BLK_MAPPED;
 792                 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 793                 goto out_free;
 794         }
 795
 796         /* Are we beyond EOF and preallocated extent? */
 797         if (etype == -1) {
 798                 loff_t hole_len;
 799
 800                 isBeyondEOF = true;
 801                 if (count) {
 802                         if (c)
 803                                 laarr[0] = laarr[1];
 804                         startnum = 1;
 805                 } else {
 806                         /* Create a fake extent when there's not one */
 807                         memset(&laarr[0].extLocation, 0x00,
 808                                 sizeof(struct kernel_lb_addr));
 809                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 810                         /* Will udf_do_extend_file() create real extent from
 811                            a fake one? */
 812                         startnum = (offset > 0);
 813                 }
 814                 /* Create extents for the hole between EOF and offset */
 815                 hole_len = (loff_t)offset << inode->i_blkbits;
 816                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 817                 if (ret < 0)
 818                         goto out_free;
 819                 c = 0;
 820                 offset = 0;
 821                 count += ret;
 822                 /*
 823                  * Is there any real extent? - otherwise we overwrite the fake
 824                  * one...
 825                  */
 826                 if (count)
 827                         c = !c;
 828                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 829                         inode->i_sb->s_blocksize;
 830                 memset(&laarr[c].extLocation, 0x00,
 831                         sizeof(struct kernel_lb_addr));
 832                 count++;
 833                 endnum = c + 1;
 834                 lastblock = 1;
 835         } else {
 836                 isBeyondEOF = false;
 837                 endnum = startnum = ((count > 2) ? 2 : count);
 838
 839                 /* if the current extent is in position 0,
 840                    swap it with the previous */
 841                 if (!c && count != 1) {
 842                         laarr[2] = laarr[0];
 843                         laarr[0] = laarr[1];
 844                         laarr[1] = laarr[2];
 845                         c = 1;
 846                 }
 847
 848                 /* if the current block is located in an extent,
 849                    read the next extent */
 850                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 851                 if (etype != -1) {
 852                         laarr[c + 1].extLength = (etype << 30) | elen;
 853                         laarr[c + 1].extLocation = eloc;
 854                         count++;
 855                         startnum++;
 856                         endnum++;
 857                 } else
 858                         lastblock = 1;
 859         }
 860
 861         /* if the current extent is not recorded but allocated, get the
 862          * block in the extent corresponding to the requested block */
 863         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 864                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 865         else { /* otherwise, allocate a new block */
 866                 if (iinfo->i_next_alloc_block == map->lblk)
 867                         goal = iinfo->i_next_alloc_goal;
 868
 869                 if (!goal) {
 870                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 871                                 goal = iinfo->i_location.logicalBlockNum + 1;
 872                 }
 873
 874                 newblocknum = udf_new_block(inode->i_sb, inode,
 875                                 iinfo->i_location.partitionReferenceNum,
 876                                 goal, &ret);
 877                 if (!newblocknum)
 878                         goto out_free;
 879                 if (isBeyondEOF)
 880                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 881         }
 882
 883         /* if the extent the requsted block is located in contains multiple
 884          * blocks, split the extent into at most three extents. blocks prior
 885          * to requested block, requested block, and blocks after requested
 886          * block */
 887         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 888
 889         if (!(map->iflags & UDF_MAP_NOPREALLOC))
 890                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 891
 892         /* merge any continuous blocks in laarr */
 893         udf_merge_extents(inode, laarr, &endnum);
 894
 895         /* write back the new extents, inserting new extents if the new number
 896          * of extents is greater than the old number, and deleting extents if
 897          * the new number of extents is less than the old number */
 898         ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 899         if (ret < 0)
 900                 goto out_free;
 901
 902         map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
 903                                 iinfo->i_location.partitionReferenceNum, 0);
 904         if (!map->pblk) {
 905                 ret = -EFSCORRUPTED;
 906                 goto out_free;
 907         }
 908         map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
 909         iinfo->i_next_alloc_block = map->lblk + 1;
 910         iinfo->i_next_alloc_goal = newblocknum + 1;
 911         inode_set_ctime_current(inode);
 912
 913         if (IS_SYNC(inode))
 914                 udf_sync_inode(inode);
 915         else
 916                 mark_inode_dirty(inode);
 917         ret = 0;
 918 out_free:
 919         brelse(prev_epos.bh);
 920         brelse(cur_epos.bh);
 921         brelse(next_epos.bh);
 922         return ret;
 923 }
 924
 925 static void udf_split_extents(struct inode *inode, int *c, int offset,
 926                                udf_pblk_t newblocknum,
 927                                struct kernel_long_ad *laarr, int *endnum)
 928 {
 929         unsigned long blocksize = inode->i_sb->s_blocksize;
 930         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 931
 932         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 933             (laarr[*c].extLength >> 30) ==
 934                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 935                 int curr = *c;
 936                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 937                             blocksize - 1) >> blocksize_bits;
 938                 int8_t etype = (laarr[curr].extLength >> 30);
 939
 940                 if (blen == 1)
 941                         ;
 942                 else if (!offset || blen == offset + 1) {
 943                         laarr[curr + 2] = laarr[curr + 1];
 944                         laarr[curr + 1] = laarr[curr];
 945                 } else {
 946                         laarr[curr + 3] = laarr[curr + 1];
 947                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 948                 }
 949
 950                 if (offset) {
 951                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 952                                 udf_free_blocks(inode->i_sb, inode,
 953                                                 &laarr[curr].extLocation,
 954                                                 0, offset);
 955                                 laarr[curr].extLength =
 956                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 957                                         (offset << blocksize_bits);
 958                                 laarr[curr].extLocation.logicalBlockNum = 0;
 959                                 laarr[curr].extLocation.
 960                                                 partitionReferenceNum = 0;
 961                         } else
 962                                 laarr[curr].extLength = (etype << 30) |
 963                                         (offset << blocksize_bits);
 964                         curr++;
 965                         (*c)++;
 966                         (*endnum)++;
 967                 }
 968
 969                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 970                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 971                         laarr[curr].extLocation.partitionReferenceNum =
 972                                 UDF_I(inode)->i_location.partitionReferenceNum;
 973                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 974                         blocksize;
 975                 curr++;
 976
 977                 if (blen != offset + 1) {
 978                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 979                                 laarr[curr].extLocation.logicalBlockNum +=
 980                                                                 offset + 1;
 981                         laarr[curr].extLength = (etype << 30) |
 982                                 ((blen - (offset + 1)) << blocksize_bits);
 983                         curr++;
 984                         (*endnum)++;
 985                 }
 986         }
 987 }
 988
 989 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 990                                  struct kernel_long_ad *laarr,
 991                                  int *endnum)
 992 {
 993         int start, length = 0, currlength = 0, i;
 994
 995         if (*endnum >= (c + 1)) {
 996                 if (!lastblock)
 997                         return;
 998                 else
 999                         start = c;
1000         } else {
1001                 if ((laarr[c + 1].extLength >> 30) ==
1002                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1003                         start = c + 1;
1004                         length = currlength =
1005                                 (((laarr[c + 1].extLength &
1006                                         UDF_EXTENT_LENGTH_MASK) +
1007                                 inode->i_sb->s_blocksize - 1) >>
1008                                 inode->i_sb->s_blocksize_bits);
1009                 } else
1010                         start = c;
1011         }
1012
1013         for (i = start + 1; i <= *endnum; i++) {
1014                 if (i == *endnum) {
1015                         if (lastblock)
1016                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1017                 } else if ((laarr[i].extLength >> 30) ==
1018                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1019                         length += (((laarr[i].extLength &
1020                                                 UDF_EXTENT_LENGTH_MASK) +
1021                                     inode->i_sb->s_blocksize - 1) >>
1022                                     inode->i_sb->s_blocksize_bits);
1023                 } else
1024                         break;
1025         }
1026
1027         if (length) {
1028                 int next = laarr[start].extLocation.logicalBlockNum +
1029                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1030                           inode->i_sb->s_blocksize - 1) >>
1031                           inode->i_sb->s_blocksize_bits);
1032                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1033                                 laarr[start].extLocation.partitionReferenceNum,
1034                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1035                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1036                                 currlength);
1037                 if (numalloc)   {
1038                         if (start == (c + 1))
1039                                 laarr[start].extLength +=
1040                                         (numalloc <<
1041                                          inode->i_sb->s_blocksize_bits);
1042                         else {
1043                                 memmove(&laarr[c + 2], &laarr[c + 1],
1044                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1045                                 (*endnum)++;
1046                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1047                                 laarr[c + 1].extLocation.partitionReferenceNum =
1048                                         laarr[c].extLocation.
1049                                                         partitionReferenceNum;
1050                                 laarr[c + 1].extLength =
1051                                         EXT_NOT_RECORDED_ALLOCATED |
1052                                         (numalloc <<
1053                                          inode->i_sb->s_blocksize_bits);
1054                                 start = c + 1;
1055                         }
1056
1057                         for (i = start + 1; numalloc && i < *endnum; i++) {
1058                                 int elen = ((laarr[i].extLength &
1059                                                 UDF_EXTENT_LENGTH_MASK) +
1060                                             inode->i_sb->s_blocksize - 1) >>
1061                                             inode->i_sb->s_blocksize_bits;
1062
1063                                 if (elen > numalloc) {
1064                                         laarr[i].extLength -=
1065                                                 (numalloc <<
1066                                                  inode->i_sb->s_blocksize_bits);
1067                                         numalloc = 0;
1068                                 } else {
1069                                         numalloc -= elen;
1070                                         if (*endnum > (i + 1))
1071                                                 memmove(&laarr[i],
1072                                                         &laarr[i + 1],
1073                                                         sizeof(struct long_ad) *
1074                                                         (*endnum - (i + 1)));
1075                                         i--;
1076                                         (*endnum)--;
1077                                 }
1078                         }
1079                         UDF_I(inode)->i_lenExtents +=
1080                                 numalloc << inode->i_sb->s_blocksize_bits;
1081                 }
1082         }
1083 }
1084
1085 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1086                               int *endnum)
1087 {
1088         int i;
1089         unsigned long blocksize = inode->i_sb->s_blocksize;
1090         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1091
1092         for (i = 0; i < (*endnum - 1); i++) {
1093                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1094                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1095
1096                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1097                         (((li->extLength >> 30) ==
1098                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1099                         ((lip1->extLocation.logicalBlockNum -
1100                           li->extLocation.logicalBlockNum) ==
1101                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1102                         blocksize - 1) >> blocksize_bits)))) {
1103
1104                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1105                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1106                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1107                                 li->extLength = lip1->extLength +
1108                                         (((li->extLength &
1109                                                 UDF_EXTENT_LENGTH_MASK) +
1110                                          blocksize - 1) & ~(blocksize - 1));
1111                                 if (*endnum > (i + 2))
1112                                         memmove(&laarr[i + 1], &laarr[i + 2],
1113                                                 sizeof(struct long_ad) *
1114                                                 (*endnum - (i + 2)));
1115                                 i--;
1116                                 (*endnum)--;
1117                         }
1118                 } else if (((li->extLength >> 30) ==
1119                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1120                            ((lip1->extLength >> 30) ==
1121                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1122                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1123                                         ((li->extLength &
1124                                           UDF_EXTENT_LENGTH_MASK) +
1125                                          blocksize - 1) >> blocksize_bits);
1126                         li->extLocation.logicalBlockNum = 0;
1127                         li->extLocation.partitionReferenceNum = 0;
1128
1129                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1130                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1131                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1132                                 lip1->extLength = (lip1->extLength -
1133                                                    (li->extLength &
1134                                                    UDF_EXTENT_LENGTH_MASK) +
1135                                                    UDF_EXTENT_LENGTH_MASK) &
1136                                                    ~(blocksize - 1);
1137                                 li->extLength = (li->extLength &
1138                                                  UDF_EXTENT_FLAG_MASK) +
1139                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1140                                                 blocksize;
1141                         } else {
1142                                 li->extLength = lip1->extLength +
1143                                         (((li->extLength &
1144                                                 UDF_EXTENT_LENGTH_MASK) +
1145                                           blocksize - 1) & ~(blocksize - 1));
1146                                 if (*endnum > (i + 2))
1147                                         memmove(&laarr[i + 1], &laarr[i + 2],
1148                                                 sizeof(struct long_ad) *
1149                                                 (*endnum - (i + 2)));
1150                                 i--;
1151                                 (*endnum)--;
1152                         }
1153                 } else if ((li->extLength >> 30) ==
1154                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1155                         udf_free_blocks(inode->i_sb, inode,
1156                                         &li->extLocation, 0,
1157                                         ((li->extLength &
1158                                                 UDF_EXTENT_LENGTH_MASK) +
1159                                          blocksize - 1) >> blocksize_bits);
1160                         li->extLocation.logicalBlockNum = 0;
1161                         li->extLocation.partitionReferenceNum = 0;
1162                         li->extLength = (li->extLength &
1163                                                 UDF_EXTENT_LENGTH_MASK) |
1164                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1165                 }
1166         }
1167 }
1168
1169 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1170                               int startnum, int endnum,
1171                               struct extent_position *epos)
1172 {
1173         int start = 0, i;
1174         struct kernel_lb_addr tmploc;
1175         uint32_t tmplen;
1176         int err;
1177
1178         if (startnum > endnum) {
1179                 for (i = 0; i < (startnum - endnum); i++)
1180                         udf_delete_aext(inode, *epos);
1181         } else if (startnum < endnum) {
1182                 for (i = 0; i < (endnum - startnum); i++) {
1183                         err = udf_insert_aext(inode, *epos,
1184                                               laarr[i].extLocation,
1185                                               laarr[i].extLength);
1186                         /*
1187                          * If we fail here, we are likely corrupting the extent
1188                          * list and leaking blocks. At least stop early to
1189                          * limit the damage.
1190                          */
1191                         if (err < 0)
1192                                 return err;
1193                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1194                                       &laarr[i].extLength, 1);
1195                         start++;
1196                 }
1197         }
1198
1199         for (i = start; i < endnum; i++) {
1200                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1201                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1202                                laarr[i].extLength, 1);
1203         }
1204         return 0;
1205 }
1206
1207 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1208                               int create, int *err)
1209 {
1210         struct buffer_head *bh = NULL;
1211         struct udf_map_rq map = {
1212                 .lblk = block,
1213                 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1214         };
1215
1216         *err = udf_map_block(inode, &map);
1217         if (*err || !(map.oflags & UDF_BLK_MAPPED))
1218                 return NULL;
1219
1220         bh = sb_getblk(inode->i_sb, map.pblk);
1221         if (!bh) {
1222                 *err = -ENOMEM;
1223                 return NULL;
1224         }
1225         if (map.oflags & UDF_BLK_NEW) {
1226                 lock_buffer(bh);
1227                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1228                 set_buffer_uptodate(bh);
1229                 unlock_buffer(bh);
1230                 mark_buffer_dirty_inode(bh, inode);
1231                 return bh;
1232         }
1233
1234         if (bh_read(bh, 0) >= 0)
1235                 return bh;
1236
1237         brelse(bh);
1238         *err = -EIO;
1239         return NULL;
1240 }
1241
1242 int udf_setsize(struct inode *inode, loff_t newsize)
1243 {
1244         int err = 0;
1245         struct udf_inode_info *iinfo;
1246         unsigned int bsize = i_blocksize(inode);
1247
1248         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1249               S_ISLNK(inode->i_mode)))
1250                 return -EINVAL;
1251         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1252                 return -EPERM;
1253
1254         filemap_invalidate_lock(inode->i_mapping);
1255         iinfo = UDF_I(inode);
1256         if (newsize > inode->i_size) {
1257                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1258                         if (bsize >=
1259                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1260                                 down_write(&iinfo->i_data_sem);
1261                                 iinfo->i_lenAlloc = newsize;
1262                                 up_write(&iinfo->i_data_sem);
1263                                 goto set_size;
1264                         }
1265                         err = udf_expand_file_adinicb(inode);
1266                         if (err)
1267                                 goto out_unlock;
1268                 }
1269                 err = udf_extend_file(inode, newsize);
1270                 if (err)
1271                         goto out_unlock;
1272 set_size:
1273                 truncate_setsize(inode, newsize);
1274         } else {
1275                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1276                         down_write(&iinfo->i_data_sem);
1277                         udf_clear_extent_cache(inode);
1278                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1279                                0x00, bsize - newsize -
1280                                udf_file_entry_alloc_offset(inode));
1281                         iinfo->i_lenAlloc = newsize;
1282                         truncate_setsize(inode, newsize);
1283                         up_write(&iinfo->i_data_sem);
1284                         goto update_time;
1285                 }
1286                 err = block_truncate_page(inode->i_mapping, newsize,
1287                                           udf_get_block);
1288                 if (err)
1289                         goto out_unlock;
1290                 truncate_setsize(inode, newsize);
1291                 down_write(&iinfo->i_data_sem);
1292                 udf_clear_extent_cache(inode);
1293                 err = udf_truncate_extents(inode);
1294                 up_write(&iinfo->i_data_sem);
1295                 if (err)
1296                         goto out_unlock;
1297         }
1298 update_time:
1299         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1300         if (IS_SYNC(inode))
1301                 udf_sync_inode(inode);
1302         else
1303                 mark_inode_dirty(inode);
1304 out_unlock:
1305         filemap_invalidate_unlock(inode->i_mapping);
1306         return err;
1307 }
1308
1309 /*
1310  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1311  * arbitrary - just that we hopefully don't limit any real use of rewritten
1312  * inode on write-once media but avoid looping for too long on corrupted media.
1313  */
1314 #define UDF_MAX_ICB_NESTING 1024
1315
1316 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1317 {
1318         struct buffer_head *bh = NULL;
1319         struct fileEntry *fe;
1320         struct extendedFileEntry *efe;
1321         uint16_t ident;
1322         struct udf_inode_info *iinfo = UDF_I(inode);
1323         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1324         struct kernel_lb_addr *iloc = &iinfo->i_location;
1325         unsigned int link_count;
1326         unsigned int indirections = 0;
1327         int bs = inode->i_sb->s_blocksize;
1328         int ret = -EIO;
1329         uint32_t uid, gid;
1330         struct timespec64 ts;
1331
1332 reread:
1333         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1334                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1335                           iloc->partitionReferenceNum, sbi->s_partitions);
1336                 return -EIO;
1337         }
1338
1339         if (iloc->logicalBlockNum >=
1340             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1341                 udf_debug("block=%u, partition=%u out of range\n",
1342                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1343                 return -EIO;
1344         }
1345
1346         /*
1347          * Set defaults, but the inode is still incomplete!
1348          * Note: get_new_inode() sets the following on a new inode:
1349          *      i_sb = sb
1350          *      i_no = ino
1351          *      i_flags = sb->s_flags
1352          *      i_state = 0
1353          * clean_inode(): zero fills and sets
1354          *      i_count = 1
1355          *      i_nlink = 1
1356          *      i_op = NULL;
1357          */
1358         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1359         if (!bh) {
1360                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1361                 return -EIO;
1362         }
1363
1364         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1365             ident != TAG_IDENT_USE) {
1366                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1367                         inode->i_ino, ident);
1368                 goto out;
1369         }
1370
1371         fe = (struct fileEntry *)bh->b_data;
1372         efe = (struct extendedFileEntry *)bh->b_data;
1373
1374         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1375                 struct buffer_head *ibh;
1376
1377                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1378                 if (ident == TAG_IDENT_IE && ibh) {
1379                         struct kernel_lb_addr loc;
1380                         struct indirectEntry *ie;
1381
1382                         ie = (struct indirectEntry *)ibh->b_data;
1383                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1384
1385                         if (ie->indirectICB.extLength) {
1386                                 brelse(ibh);
1387                                 memcpy(&iinfo->i_location, &loc,
1388                                        sizeof(struct kernel_lb_addr));
1389                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1390                                         udf_err(inode->i_sb,
1391                                                 "too many ICBs in ICB hierarchy"
1392                                                 " (max %d supported)\n",
1393                                                 UDF_MAX_ICB_NESTING);
1394                                         goto out;
1395                                 }
1396                                 brelse(bh);
1397                                 goto reread;
1398                         }
1399                 }
1400                 brelse(ibh);
1401         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1402                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1403                         le16_to_cpu(fe->icbTag.strategyType));
1404                 goto out;
1405         }
1406         if (fe->icbTag.strategyType == cpu_to_le16(4))
1407                 iinfo->i_strat4096 = 0;
1408         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1409                 iinfo->i_strat4096 = 1;
1410
1411         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1412                                                         ICBTAG_FLAG_AD_MASK;
1413         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1414             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1415             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1416                 ret = -EIO;
1417                 goto out;
1418         }
1419         iinfo->i_hidden = hidden_inode;
1420         iinfo->i_unique = 0;
1421         iinfo->i_lenEAttr = 0;
1422         iinfo->i_lenExtents = 0;
1423         iinfo->i_lenAlloc = 0;
1424         iinfo->i_next_alloc_block = 0;
1425         iinfo->i_next_alloc_goal = 0;
1426         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1427                 iinfo->i_efe = 1;
1428                 iinfo->i_use = 0;
1429                 ret = udf_alloc_i_data(inode, bs -
1430                                         sizeof(struct extendedFileEntry));
1431                 if (ret)
1432                         goto out;
1433                 memcpy(iinfo->i_data,
1434                        bh->b_data + sizeof(struct extendedFileEntry),
1435                        bs - sizeof(struct extendedFileEntry));
1436         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1437                 iinfo->i_efe = 0;
1438                 iinfo->i_use = 0;
1439                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1440                 if (ret)
1441                         goto out;
1442                 memcpy(iinfo->i_data,
1443                        bh->b_data + sizeof(struct fileEntry),
1444                        bs - sizeof(struct fileEntry));
1445         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1446                 iinfo->i_efe = 0;
1447                 iinfo->i_use = 1;
1448                 iinfo->i_lenAlloc = le32_to_cpu(
1449                                 ((struct unallocSpaceEntry *)bh->b_data)->
1450                                  lengthAllocDescs);
1451                 ret = udf_alloc_i_data(inode, bs -
1452                                         sizeof(struct unallocSpaceEntry));
1453                 if (ret)
1454                         goto out;
1455                 memcpy(iinfo->i_data,
1456                        bh->b_data + sizeof(struct unallocSpaceEntry),
1457                        bs - sizeof(struct unallocSpaceEntry));
1458                 return 0;
1459         }
1460
1461         ret = -EIO;
1462         read_lock(&sbi->s_cred_lock);
1463         uid = le32_to_cpu(fe->uid);
1464         if (uid == UDF_INVALID_ID ||
1465             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1466                 inode->i_uid = sbi->s_uid;
1467         else
1468                 i_uid_write(inode, uid);
1469
1470         gid = le32_to_cpu(fe->gid);
1471         if (gid == UDF_INVALID_ID ||
1472             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1473                 inode->i_gid = sbi->s_gid;
1474         else
1475                 i_gid_write(inode, gid);
1476
1477         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1478                         sbi->s_fmode != UDF_INVALID_MODE)
1479                 inode->i_mode = sbi->s_fmode;
1480         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1481                         sbi->s_dmode != UDF_INVALID_MODE)
1482                 inode->i_mode = sbi->s_dmode;
1483         else
1484                 inode->i_mode = udf_convert_permissions(fe);
1485         inode->i_mode &= ~sbi->s_umask;
1486         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1487
1488         read_unlock(&sbi->s_cred_lock);
1489
1490         link_count = le16_to_cpu(fe->fileLinkCount);
1491         if (!link_count) {
1492                 if (!hidden_inode) {
1493                         ret = -ESTALE;
1494                         goto out;
1495                 }
1496                 link_count = 1;
1497         }
1498         set_nlink(inode, link_count);
1499
1500         inode->i_size = le64_to_cpu(fe->informationLength);
1501         iinfo->i_lenExtents = inode->i_size;
1502
1503         if (iinfo->i_efe == 0) {
1504                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1505                         (inode->i_sb->s_blocksize_bits - 9);
1506
1507                 udf_disk_stamp_to_time(&ts, fe->accessTime);
1508                 inode_set_atime_to_ts(inode, ts);
1509                 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1510                 inode_set_mtime_to_ts(inode, ts);
1511                 udf_disk_stamp_to_time(&ts, fe->attrTime);
1512                 inode_set_ctime_to_ts(inode, ts);
1513
1514                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1515                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1516                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1517                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1518                 iinfo->i_streamdir = 0;
1519                 iinfo->i_lenStreams = 0;
1520         } else {
1521                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1522                     (inode->i_sb->s_blocksize_bits - 9);
1523
1524                 udf_disk_stamp_to_time(&ts, efe->accessTime);
1525                 inode_set_atime_to_ts(inode, ts);
1526                 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1527                 inode_set_mtime_to_ts(inode, ts);
1528                 udf_disk_stamp_to_time(&ts, efe->attrTime);
1529                 inode_set_ctime_to_ts(inode, ts);
1530                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1531
1532                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1533                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1534                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1535                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1536
1537                 /* Named streams */
1538                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1539                 iinfo->i_locStreamdir =
1540                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1541                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1542                 if (iinfo->i_lenStreams >= inode->i_size)
1543                         iinfo->i_lenStreams -= inode->i_size;
1544                 else
1545                         iinfo->i_lenStreams = 0;
1546         }
1547         inode->i_generation = iinfo->i_unique;
1548
1549         /*
1550          * Sanity check length of allocation descriptors and extended attrs to
1551          * avoid integer overflows
1552          */
1553         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1554                 goto out;
1555         /* Now do exact checks */
1556         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1557                 goto out;
1558         /* Sanity checks for files in ICB so that we don't get confused later */
1559         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1560                 /*
1561                  * For file in ICB data is stored in allocation descriptor
1562                  * so sizes should match
1563                  */
1564                 if (iinfo->i_lenAlloc != inode->i_size)
1565                         goto out;
1566                 /* File in ICB has to fit in there... */
1567                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1568                         goto out;
1569         }
1570
1571         switch (fe->icbTag.fileType) {
1572         case ICBTAG_FILE_TYPE_DIRECTORY:
1573                 inode->i_op = &udf_dir_inode_operations;
1574                 inode->i_fop = &udf_dir_operations;
1575                 inode->i_mode |= S_IFDIR;
1576                 inc_nlink(inode);
1577                 break;
1578         case ICBTAG_FILE_TYPE_REALTIME:
1579         case ICBTAG_FILE_TYPE_REGULAR:
1580         case ICBTAG_FILE_TYPE_UNDEF:
1581         case ICBTAG_FILE_TYPE_VAT20:
1582                 inode->i_data.a_ops = &udf_aops;
1583                 inode->i_op = &udf_file_inode_operations;
1584                 inode->i_fop = &udf_file_operations;
1585                 inode->i_mode |= S_IFREG;
1586                 break;
1587         case ICBTAG_FILE_TYPE_BLOCK:
1588                 inode->i_mode |= S_IFBLK;
1589                 break;
1590         case ICBTAG_FILE_TYPE_CHAR:
1591                 inode->i_mode |= S_IFCHR;
1592                 break;
1593         case ICBTAG_FILE_TYPE_FIFO:
1594                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1595                 break;
1596         case ICBTAG_FILE_TYPE_SOCKET:
1597                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1598                 break;
1599         case ICBTAG_FILE_TYPE_SYMLINK:
1600                 inode->i_data.a_ops = &udf_symlink_aops;
1601                 inode->i_op = &udf_symlink_inode_operations;
1602                 inode_nohighmem(inode);
1603                 inode->i_mode = S_IFLNK | 0777;
1604                 break;
1605         case ICBTAG_FILE_TYPE_MAIN:
1606                 udf_debug("METADATA FILE-----\n");
1607                 break;
1608         case ICBTAG_FILE_TYPE_MIRROR:
1609                 udf_debug("METADATA MIRROR FILE-----\n");
1610                 break;
1611         case ICBTAG_FILE_TYPE_BITMAP:
1612                 udf_debug("METADATA BITMAP FILE-----\n");
1613                 break;
1614         default:
1615                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1616                         inode->i_ino, fe->icbTag.fileType);
1617                 goto out;
1618         }
1619         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1620                 struct deviceSpec *dsea =
1621                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1622                 if (dsea) {
1623                         init_special_inode(inode, inode->i_mode,
1624                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1625                                       le32_to_cpu(dsea->minorDeviceIdent)));
1626                         /* Developer ID ??? */
1627                 } else
1628                         goto out;
1629         }
1630         ret = 0;
1631 out:
1632         brelse(bh);
1633         return ret;
1634 }
1635
1636 static int udf_alloc_i_data(struct inode *inode, size_t size)
1637 {
1638         struct udf_inode_info *iinfo = UDF_I(inode);
1639         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1640         if (!iinfo->i_data)
1641                 return -ENOMEM;
1642         return 0;
1643 }
1644
1645 static umode_t udf_convert_permissions(struct fileEntry *fe)
1646 {
1647         umode_t mode;
1648         uint32_t permissions;
1649         uint32_t flags;
1650
1651         permissions = le32_to_cpu(fe->permissions);
1652         flags = le16_to_cpu(fe->icbTag.flags);
1653
1654         mode =  ((permissions) & 0007) |
1655                 ((permissions >> 2) & 0070) |
1656                 ((permissions >> 4) & 0700) |
1657                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1658                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1659                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1660
1661         return mode;
1662 }
1663
1664 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1665 {
1666         struct udf_inode_info *iinfo = UDF_I(inode);
1667
1668         /*
1669          * UDF 2.01 sec. 3.3.3.3 Note 2:
1670          * In Unix, delete permission tracks write
1671          */
1672         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1673         if (mode & 0200)
1674                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1675         if (mode & 0020)
1676                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1677         if (mode & 0002)
1678                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1679 }
1680
1681 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1682 {
1683         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1684 }
1685
1686 static int udf_sync_inode(struct inode *inode)
1687 {
1688         return udf_update_inode(inode, 1);
1689 }
1690
1691 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1692 {
1693         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1694             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1695              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1696                 iinfo->i_crtime = time;
1697 }
1698
1699 static int udf_update_inode(struct inode *inode, int do_sync)
1700 {
1701         struct buffer_head *bh = NULL;
1702         struct fileEntry *fe;
1703         struct extendedFileEntry *efe;
1704         uint64_t lb_recorded;
1705         uint32_t udfperms;
1706         uint16_t icbflags;
1707         uint16_t crclen;
1708         int err = 0;
1709         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1710         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1711         struct udf_inode_info *iinfo = UDF_I(inode);
1712
1713         bh = sb_getblk(inode->i_sb,
1714                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1715         if (!bh) {
1716                 udf_debug("getblk failure\n");
1717                 return -EIO;
1718         }
1719
1720         lock_buffer(bh);
1721         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1722         fe = (struct fileEntry *)bh->b_data;
1723         efe = (struct extendedFileEntry *)bh->b_data;
1724
1725         if (iinfo->i_use) {
1726                 struct unallocSpaceEntry *use =
1727                         (struct unallocSpaceEntry *)bh->b_data;
1728
1729                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1730                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1731                        iinfo->i_data, inode->i_sb->s_blocksize -
1732                                         sizeof(struct unallocSpaceEntry));
1733                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1734                 crclen = sizeof(struct unallocSpaceEntry);
1735
1736                 goto finish;
1737         }
1738
1739         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1740                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1741         else
1742                 fe->uid = cpu_to_le32(i_uid_read(inode));
1743
1744         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1745                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1746         else
1747                 fe->gid = cpu_to_le32(i_gid_read(inode));
1748
1749         udfperms = ((inode->i_mode & 0007)) |
1750                    ((inode->i_mode & 0070) << 2) |
1751                    ((inode->i_mode & 0700) << 4);
1752
1753         udfperms |= iinfo->i_extraPerms;
1754         fe->permissions = cpu_to_le32(udfperms);
1755
1756         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1757                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1758         else {
1759                 if (iinfo->i_hidden)
1760                         fe->fileLinkCount = cpu_to_le16(0);
1761                 else
1762                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1763         }
1764
1765         fe->informationLength = cpu_to_le64(inode->i_size);
1766
1767         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1768                 struct regid *eid;
1769                 struct deviceSpec *dsea =
1770                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1771                 if (!dsea) {
1772                         dsea = (struct deviceSpec *)
1773                                 udf_add_extendedattr(inode,
1774                                                      sizeof(struct deviceSpec) +
1775                                                      sizeof(struct regid), 12, 0x3);
1776                         dsea->attrType = cpu_to_le32(12);
1777                         dsea->attrSubtype = 1;
1778                         dsea->attrLength = cpu_to_le32(
1779                                                 sizeof(struct deviceSpec) +
1780                                                 sizeof(struct regid));
1781                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1782                 }
1783                 eid = (struct regid *)dsea->impUse;
1784                 memset(eid, 0, sizeof(*eid));
1785                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1786                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1787                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1788                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1789                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1790         }
1791
1792         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1793                 lb_recorded = 0; /* No extents => no blocks! */
1794         else
1795                 lb_recorded =
1796                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1797                         (blocksize_bits - 9);
1798
1799         if (iinfo->i_efe == 0) {
1800                 memcpy(bh->b_data + sizeof(struct fileEntry),
1801                        iinfo->i_data,
1802                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1803                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1804
1805                 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1806                 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
1807                 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1808                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1809                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1810                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1811                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1812                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1813                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1814                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1815                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1816                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1817                 crclen = sizeof(struct fileEntry);
1818         } else {
1819                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1820                        iinfo->i_data,
1821                        inode->i_sb->s_blocksize -
1822                                         sizeof(struct extendedFileEntry));
1823                 efe->objectSize =
1824                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1825                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1826
1827                 if (iinfo->i_streamdir) {
1828                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1829
1830                         icb_lad->extLocation =
1831                                 cpu_to_lelb(iinfo->i_locStreamdir);
1832                         icb_lad->extLength =
1833                                 cpu_to_le32(inode->i_sb->s_blocksize);
1834                 }
1835
1836                 udf_adjust_time(iinfo, inode_get_atime(inode));
1837                 udf_adjust_time(iinfo, inode_get_mtime(inode));
1838                 udf_adjust_time(iinfo, inode_get_ctime(inode));
1839
1840                 udf_time_to_disk_stamp(&efe->accessTime,
1841                                        inode_get_atime(inode));
1842                 udf_time_to_disk_stamp(&efe->modificationTime,
1843                                        inode_get_mtime(inode));
1844                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1845                 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1846
1847                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1848                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1849                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1850                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1851                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1852                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1853                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1854                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1855                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1856                 crclen = sizeof(struct extendedFileEntry);
1857         }
1858
1859 finish:
1860         if (iinfo->i_strat4096) {
1861                 fe->icbTag.strategyType = cpu_to_le16(4096);
1862                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1863                 fe->icbTag.numEntries = cpu_to_le16(2);
1864         } else {
1865                 fe->icbTag.strategyType = cpu_to_le16(4);
1866                 fe->icbTag.numEntries = cpu_to_le16(1);
1867         }
1868
1869         if (iinfo->i_use)
1870                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1871         else if (S_ISDIR(inode->i_mode))
1872                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1873         else if (S_ISREG(inode->i_mode))
1874                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1875         else if (S_ISLNK(inode->i_mode))
1876                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1877         else if (S_ISBLK(inode->i_mode))
1878                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1879         else if (S_ISCHR(inode->i_mode))
1880                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1881         else if (S_ISFIFO(inode->i_mode))
1882                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1883         else if (S_ISSOCK(inode->i_mode))
1884                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1885
1886         icbflags =      iinfo->i_alloc_type |
1887                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1888                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1889                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1890                         (le16_to_cpu(fe->icbTag.flags) &
1891                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1892                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1893
1894         fe->icbTag.flags = cpu_to_le16(icbflags);
1895         if (sbi->s_udfrev >= 0x0200)
1896                 fe->descTag.descVersion = cpu_to_le16(3);
1897         else
1898                 fe->descTag.descVersion = cpu_to_le16(2);
1899         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1900         fe->descTag.tagLocation = cpu_to_le32(
1901                                         iinfo->i_location.logicalBlockNum);
1902         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1903         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1904         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1905                                                   crclen));
1906         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1907
1908         set_buffer_uptodate(bh);
1909         unlock_buffer(bh);
1910
1911         /* write the data blocks */
1912         mark_buffer_dirty(bh);
1913         if (do_sync) {
1914                 sync_dirty_buffer(bh);
1915                 if (buffer_write_io_error(bh)) {
1916                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1917                                  inode->i_ino);
1918                         err = -EIO;
1919                 }
1920         }
1921         brelse(bh);
1922
1923         return err;
1924 }
1925
1926 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1927                          bool hidden_inode)
1928 {
1929         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1930         struct inode *inode = iget_locked(sb, block);
1931         int err;
1932
1933         if (!inode)
1934                 return ERR_PTR(-ENOMEM);
1935
1936         if (!(inode->i_state & I_NEW)) {
1937                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1938                         iput(inode);
1939                         return ERR_PTR(-EFSCORRUPTED);
1940                 }
1941                 return inode;
1942         }
1943
1944         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1945         err = udf_read_inode(inode, hidden_inode);
1946         if (err < 0) {
1947                 iget_failed(inode);
1948                 return ERR_PTR(err);
1949         }
1950         unlock_new_inode(inode);
1951
1952         return inode;
1953 }
1954
1955 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1956                             struct extent_position *epos)
1957 {
1958         struct super_block *sb = inode->i_sb;
1959         struct buffer_head *bh;
1960         struct allocExtDesc *aed;
1961         struct extent_position nepos;
1962         struct kernel_lb_addr neloc;
1963         int ver, adsize;
1964
1965         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1966                 adsize = sizeof(struct short_ad);
1967         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1968                 adsize = sizeof(struct long_ad);
1969         else
1970                 return -EIO;
1971
1972         neloc.logicalBlockNum = block;
1973         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1974
1975         bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1976         if (!bh)
1977                 return -EIO;
1978         lock_buffer(bh);
1979         memset(bh->b_data, 0x00, sb->s_blocksize);
1980         set_buffer_uptodate(bh);
1981         unlock_buffer(bh);
1982         mark_buffer_dirty_inode(bh, inode);
1983
1984         aed = (struct allocExtDesc *)(bh->b_data);
1985         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1986                 aed->previousAllocExtLocation =
1987                                 cpu_to_le32(epos->block.logicalBlockNum);
1988         }
1989         aed->lengthAllocDescs = cpu_to_le32(0);
1990         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1991                 ver = 3;
1992         else
1993                 ver = 2;
1994         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1995                     sizeof(struct tag));
1996
1997         nepos.block = neloc;
1998         nepos.offset = sizeof(struct allocExtDesc);
1999         nepos.bh = bh;
2000
2001         /*
2002          * Do we have to copy current last extent to make space for indirect
2003          * one?
2004          */
2005         if (epos->offset + adsize > sb->s_blocksize) {
2006                 struct kernel_lb_addr cp_loc;
2007                 uint32_t cp_len;
2008                 int cp_type;
2009
2010                 epos->offset -= adsize;
2011                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2012                 cp_len |= ((uint32_t)cp_type) << 30;
2013
2014                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2015                 udf_write_aext(inode, epos, &nepos.block,
2016                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2017         } else {
2018                 __udf_add_aext(inode, epos, &nepos.block,
2019                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2020         }
2021
2022         brelse(epos->bh);
2023         *epos = nepos;
2024
2025         return 0;
2026 }
2027
2028 /*
2029  * Append extent at the given position - should be the first free one in inode
2030  * / indirect extent. This function assumes there is enough space in the inode
2031  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2032  */
2033 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2034                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2035 {
2036         struct udf_inode_info *iinfo = UDF_I(inode);
2037         struct allocExtDesc *aed;
2038         int adsize;
2039
2040         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2041                 adsize = sizeof(struct short_ad);
2042         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2043                 adsize = sizeof(struct long_ad);
2044         else
2045                 return -EIO;
2046
2047         if (!epos->bh) {
2048                 WARN_ON(iinfo->i_lenAlloc !=
2049                         epos->offset - udf_file_entry_alloc_offset(inode));
2050         } else {
2051                 aed = (struct allocExtDesc *)epos->bh->b_data;
2052                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2053                         epos->offset - sizeof(struct allocExtDesc));
2054                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2055         }
2056
2057         udf_write_aext(inode, epos, eloc, elen, inc);
2058
2059         if (!epos->bh) {
2060                 iinfo->i_lenAlloc += adsize;
2061                 mark_inode_dirty(inode);
2062         } else {
2063                 aed = (struct allocExtDesc *)epos->bh->b_data;
2064                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2065                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2066                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2067                         udf_update_tag(epos->bh->b_data,
2068                                         epos->offset + (inc ? 0 : adsize));
2069                 else
2070                         udf_update_tag(epos->bh->b_data,
2071                                         sizeof(struct allocExtDesc));
2072                 mark_buffer_dirty_inode(epos->bh, inode);
2073         }
2074
2075         return 0;
2076 }
2077
2078 /*
2079  * Append extent at given position - should be the first free one in inode
2080  * / indirect extent. Takes care of allocating and linking indirect blocks.
2081  */
2082 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2083                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2084 {
2085         int adsize;
2086         struct super_block *sb = inode->i_sb;
2087
2088         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2089                 adsize = sizeof(struct short_ad);
2090         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2091                 adsize = sizeof(struct long_ad);
2092         else
2093                 return -EIO;
2094
2095         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2096                 int err;
2097                 udf_pblk_t new_block;
2098
2099                 new_block = udf_new_block(sb, NULL,
2100                                           epos->block.partitionReferenceNum,
2101                                           epos->block.logicalBlockNum, &err);
2102                 if (!new_block)
2103                         return -ENOSPC;
2104
2105                 err = udf_setup_indirect_aext(inode, new_block, epos);
2106                 if (err)
2107                         return err;
2108         }
2109
2110         return __udf_add_aext(inode, epos, eloc, elen, inc);
2111 }
2112
2113 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2114                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2115 {
2116         int adsize;
2117         uint8_t *ptr;
2118         struct short_ad *sad;
2119         struct long_ad *lad;
2120         struct udf_inode_info *iinfo = UDF_I(inode);
2121
2122         if (!epos->bh)
2123                 ptr = iinfo->i_data + epos->offset -
2124                         udf_file_entry_alloc_offset(inode) +
2125                         iinfo->i_lenEAttr;
2126         else
2127                 ptr = epos->bh->b_data + epos->offset;
2128
2129         switch (iinfo->i_alloc_type) {
2130         case ICBTAG_FLAG_AD_SHORT:
2131                 sad = (struct short_ad *)ptr;
2132                 sad->extLength = cpu_to_le32(elen);
2133                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2134                 adsize = sizeof(struct short_ad);
2135                 break;
2136         case ICBTAG_FLAG_AD_LONG:
2137                 lad = (struct long_ad *)ptr;
2138                 lad->extLength = cpu_to_le32(elen);
2139                 lad->extLocation = cpu_to_lelb(*eloc);
2140                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2141                 adsize = sizeof(struct long_ad);
2142                 break;
2143         default:
2144                 return;
2145         }
2146
2147         if (epos->bh) {
2148                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2149                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2150                         struct allocExtDesc *aed =
2151                                 (struct allocExtDesc *)epos->bh->b_data;
2152                         udf_update_tag(epos->bh->b_data,
2153                                        le32_to_cpu(aed->lengthAllocDescs) +
2154                                        sizeof(struct allocExtDesc));
2155                 }
2156                 mark_buffer_dirty_inode(epos->bh, inode);
2157         } else {
2158                 mark_inode_dirty(inode);
2159         }
2160
2161         if (inc)
2162                 epos->offset += adsize;
2163 }
2164
2165 /*
2166  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2167  * someone does some weird stuff.
2168  */
2169 #define UDF_MAX_INDIR_EXTS 16
2170
2171 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2172                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2173 {
2174         int8_t etype;
2175         unsigned int indirections = 0;
2176
2177         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2178                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2179                 udf_pblk_t block;
2180
2181                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2182                         udf_err(inode->i_sb,
2183                                 "too many indirect extents in inode %lu\n",
2184                                 inode->i_ino);
2185                         return -1;
2186                 }
2187
2188                 epos->block = *eloc;
2189                 epos->offset = sizeof(struct allocExtDesc);
2190                 brelse(epos->bh);
2191                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2192                 epos->bh = sb_bread(inode->i_sb, block);
2193                 if (!epos->bh) {
2194                         udf_debug("reading block %u failed!\n", block);
2195                         return -1;
2196                 }
2197         }
2198
2199         return etype;
2200 }
2201
2202 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2203                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2204 {
2205         int alen;
2206         int8_t etype;
2207         uint8_t *ptr;
2208         struct short_ad *sad;
2209         struct long_ad *lad;
2210         struct udf_inode_info *iinfo = UDF_I(inode);
2211
2212         if (!epos->bh) {
2213                 if (!epos->offset)
2214                         epos->offset = udf_file_entry_alloc_offset(inode);
2215                 ptr = iinfo->i_data + epos->offset -
2216                         udf_file_entry_alloc_offset(inode) +
2217                         iinfo->i_lenEAttr;
2218                 alen = udf_file_entry_alloc_offset(inode) +
2219                                                         iinfo->i_lenAlloc;
2220         } else {
2221                 if (!epos->offset)
2222                         epos->offset = sizeof(struct allocExtDesc);
2223                 ptr = epos->bh->b_data + epos->offset;
2224                 alen = sizeof(struct allocExtDesc) +
2225                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2226                                                         lengthAllocDescs);
2227         }
2228
2229         switch (iinfo->i_alloc_type) {
2230         case ICBTAG_FLAG_AD_SHORT:
2231                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2232                 if (!sad)
2233                         return -1;
2234                 etype = le32_to_cpu(sad->extLength) >> 30;
2235                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2236                 eloc->partitionReferenceNum =
2237                                 iinfo->i_location.partitionReferenceNum;
2238                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2239                 break;
2240         case ICBTAG_FLAG_AD_LONG:
2241                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2242                 if (!lad)
2243                         return -1;
2244                 etype = le32_to_cpu(lad->extLength) >> 30;
2245                 *eloc = lelb_to_cpu(lad->extLocation);
2246                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2247                 break;
2248         default:
2249                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2250                 return -1;
2251         }
2252
2253         return etype;
2254 }
2255
2256 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2257                            struct kernel_lb_addr neloc, uint32_t nelen)
2258 {
2259         struct kernel_lb_addr oeloc;
2260         uint32_t oelen;
2261         int8_t etype;
2262         int err;
2263
2264         if (epos.bh)
2265                 get_bh(epos.bh);
2266
2267         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2268                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2269                 neloc = oeloc;
2270                 nelen = (etype << 30) | oelen;
2271         }
2272         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2273         brelse(epos.bh);
2274
2275         return err;
2276 }
2277
2278 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2279 {
2280         struct extent_position oepos;
2281         int adsize;
2282         int8_t etype;
2283         struct allocExtDesc *aed;
2284         struct udf_inode_info *iinfo;
2285         struct kernel_lb_addr eloc;
2286         uint32_t elen;
2287
2288         if (epos.bh) {
2289                 get_bh(epos.bh);
2290                 get_bh(epos.bh);
2291         }
2292
2293         iinfo = UDF_I(inode);
2294         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2295                 adsize = sizeof(struct short_ad);
2296         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2297                 adsize = sizeof(struct long_ad);
2298         else
2299                 adsize = 0;
2300
2301         oepos = epos;
2302         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2303                 return -1;
2304
2305         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2306                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2307                 if (oepos.bh != epos.bh) {
2308                         oepos.block = epos.block;
2309                         brelse(oepos.bh);
2310                         get_bh(epos.bh);
2311                         oepos.bh = epos.bh;
2312                         oepos.offset = epos.offset - adsize;
2313                 }
2314         }
2315         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2316         elen = 0;
2317
2318         if (epos.bh != oepos.bh) {
2319                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2320                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2321                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2322                 if (!oepos.bh) {
2323                         iinfo->i_lenAlloc -= (adsize * 2);
2324                         mark_inode_dirty(inode);
2325                 } else {
2326                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2327                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2328                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2329                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2330                                 udf_update_tag(oepos.bh->b_data,
2331                                                 oepos.offset - (2 * adsize));
2332                         else
2333                                 udf_update_tag(oepos.bh->b_data,
2334                                                 sizeof(struct allocExtDesc));
2335                         mark_buffer_dirty_inode(oepos.bh, inode);
2336                 }
2337         } else {
2338                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2339                 if (!oepos.bh) {
2340                         iinfo->i_lenAlloc -= adsize;
2341                         mark_inode_dirty(inode);
2342                 } else {
2343                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2344                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2345                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2346                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2347                                 udf_update_tag(oepos.bh->b_data,
2348                                                 epos.offset - adsize);
2349                         else
2350                                 udf_update_tag(oepos.bh->b_data,
2351                                                 sizeof(struct allocExtDesc));
2352                         mark_buffer_dirty_inode(oepos.bh, inode);
2353                 }
2354         }
2355
2356         brelse(epos.bh);
2357         brelse(oepos.bh);
2358
2359         return (elen >> 30);
2360 }
2361
2362 int8_t inode_bmap(struct inode *inode, sector_t block,
2363                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2364                   uint32_t *elen, sector_t *offset)
2365 {
2366         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2367         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2368         int8_t etype;
2369         struct udf_inode_info *iinfo;
2370
2371         iinfo = UDF_I(inode);
2372         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2373                 pos->offset = 0;
2374                 pos->block = iinfo->i_location;
2375                 pos->bh = NULL;
2376         }
2377         *elen = 0;
2378         do {
2379                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2380                 if (etype == -1) {
2381                         *offset = (bcount - lbcount) >> blocksize_bits;
2382                         iinfo->i_lenExtents = lbcount;
2383                         return -1;
2384                 }
2385                 lbcount += *elen;
2386         } while (lbcount <= bcount);
2387         /* update extent cache */
2388         udf_update_extent_cache(inode, lbcount - *elen, pos);
2389         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2390
2391         return etype;
2392 }