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