fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 #define EXTENT_MERGE_SIZE 5
  47
  48 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
  49                          FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
  50                          FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
  51
  52 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
  53                          FE_PERM_O_DELETE)
  54
  55 struct udf_map_rq;
  56
  57 static umode_t udf_convert_permissions(struct fileEntry *);
  58 static int udf_update_inode(struct inode *, int);
  59 static int udf_sync_inode(struct inode *inode);
  60 static int udf_alloc_i_data(struct inode *inode, size_t size);
  61 static int inode_getblk(struct inode *inode, struct udf_map_rq *map);
  62 static int udf_insert_aext(struct inode *, struct extent_position,
  63                            struct kernel_lb_addr, uint32_t);
  64 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
  65                               struct kernel_long_ad *, int *);
  66 static void udf_prealloc_extents(struct inode *, int, int,
  67                                  struct kernel_long_ad *, int *);
  68 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  69 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  70                               int, struct extent_position *);
  71 static int udf_get_block_wb(struct inode *inode, sector_t block,
  72                             struct buffer_head *bh_result, int create);
  73
  74 static void __udf_clear_extent_cache(struct inode *inode)
  75 {
  76         struct udf_inode_info *iinfo = UDF_I(inode);
  77
  78         if (iinfo->cached_extent.lstart != -1) {
  79                 brelse(iinfo->cached_extent.epos.bh);
  80                 iinfo->cached_extent.lstart = -1;
  81         }
  82 }
  83
  84 /* Invalidate extent cache */
  85 static void udf_clear_extent_cache(struct inode *inode)
  86 {
  87         struct udf_inode_info *iinfo = UDF_I(inode);
  88
  89         spin_lock(&iinfo->i_extent_cache_lock);
  90         __udf_clear_extent_cache(inode);
  91         spin_unlock(&iinfo->i_extent_cache_lock);
  92 }
  93
  94 /* Return contents of extent cache */
  95 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  96                                  loff_t *lbcount, struct extent_position *pos)
  97 {
  98         struct udf_inode_info *iinfo = UDF_I(inode);
  99         int ret = 0;
 100
 101         spin_lock(&iinfo->i_extent_cache_lock);
 102         if ((iinfo->cached_extent.lstart <= bcount) &&
 103             (iinfo->cached_extent.lstart != -1)) {
 104                 /* Cache hit */
 105                 *lbcount = iinfo->cached_extent.lstart;
 106                 memcpy(pos, &iinfo->cached_extent.epos,
 107                        sizeof(struct extent_position));
 108                 if (pos->bh)
 109                         get_bh(pos->bh);
 110                 ret = 1;
 111         }
 112         spin_unlock(&iinfo->i_extent_cache_lock);
 113         return ret;
 114 }
 115
 116 /* Add extent to extent cache */
 117 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 118                                     struct extent_position *pos)
 119 {
 120         struct udf_inode_info *iinfo = UDF_I(inode);
 121
 122         spin_lock(&iinfo->i_extent_cache_lock);
 123         /* Invalidate previously cached extent */
 124         __udf_clear_extent_cache(inode);
 125         if (pos->bh)
 126                 get_bh(pos->bh);
 127         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 128         iinfo->cached_extent.lstart = estart;
 129         switch (iinfo->i_alloc_type) {
 130         case ICBTAG_FLAG_AD_SHORT:
 131                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 132                 break;
 133         case ICBTAG_FLAG_AD_LONG:
 134                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 135                 break;
 136         }
 137         spin_unlock(&iinfo->i_extent_cache_lock);
 138 }
 139
 140 void udf_evict_inode(struct inode *inode)
 141 {
 142         struct udf_inode_info *iinfo = UDF_I(inode);
 143         int want_delete = 0;
 144
 145         if (!is_bad_inode(inode)) {
 146                 if (!inode->i_nlink) {
 147                         want_delete = 1;
 148                         udf_setsize(inode, 0);
 149                         udf_update_inode(inode, IS_SYNC(inode));
 150                 }
 151                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 152                     inode->i_size != iinfo->i_lenExtents) {
 153                         udf_warn(inode->i_sb,
 154                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 155                                  inode->i_ino, inode->i_mode,
 156                                  (unsigned long long)inode->i_size,
 157                                  (unsigned long long)iinfo->i_lenExtents);
 158                 }
 159         }
 160         truncate_inode_pages_final(&inode->i_data);
 161         invalidate_inode_buffers(inode);
 162         clear_inode(inode);
 163         kfree(iinfo->i_data);
 164         iinfo->i_data = NULL;
 165         udf_clear_extent_cache(inode);
 166         if (want_delete) {
 167                 udf_free_inode(inode);
 168         }
 169 }
 170
 171 static void udf_write_failed(struct address_space *mapping, loff_t to)
 172 {
 173         struct inode *inode = mapping->host;
 174         struct udf_inode_info *iinfo = UDF_I(inode);
 175         loff_t isize = inode->i_size;
 176
 177         if (to > isize) {
 178                 truncate_pagecache(inode, isize);
 179                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 180                         down_write(&iinfo->i_data_sem);
 181                         udf_clear_extent_cache(inode);
 182                         udf_truncate_extents(inode);
 183                         up_write(&iinfo->i_data_sem);
 184                 }
 185         }
 186 }
 187
 188 static int udf_adinicb_writepage(struct folio *folio,
 189                                  struct writeback_control *wbc, void *data)
 190 {
 191         struct inode *inode = folio->mapping->host;
 192         struct udf_inode_info *iinfo = UDF_I(inode);
 193
 194         BUG_ON(!folio_test_locked(folio));
 195         BUG_ON(folio->index != 0);
 196         memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 0,
 197                        i_size_read(inode));
 198         folio_unlock(folio);
 199         mark_inode_dirty(inode);
 200
 201         return 0;
 202 }
 203
 204 static int udf_writepages(struct address_space *mapping,
 205                           struct writeback_control *wbc)
 206 {
 207         struct inode *inode = mapping->host;
 208         struct udf_inode_info *iinfo = UDF_I(inode);
 209
 210         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 211                 return mpage_writepages(mapping, wbc, udf_get_block_wb);
 212         return write_cache_pages(mapping, wbc, udf_adinicb_writepage, NULL);
 213 }
 214
 215 static void udf_adinicb_readpage(struct page *page)
 216 {
 217         struct inode *inode = page->mapping->host;
 218         char *kaddr;
 219         struct udf_inode_info *iinfo = UDF_I(inode);
 220         loff_t isize = i_size_read(inode);
 221
 222         kaddr = kmap_local_page(page);
 223         memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr, isize);
 224         memset(kaddr + isize, 0, PAGE_SIZE - isize);
 225         flush_dcache_page(page);
 226         SetPageUptodate(page);
 227         kunmap_local(kaddr);
 228 }
 229
 230 static int udf_read_folio(struct file *file, struct folio *folio)
 231 {
 232         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 233
 234         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 235                 udf_adinicb_readpage(&folio->page);
 236                 folio_unlock(folio);
 237                 return 0;
 238         }
 239         return mpage_read_folio(folio, udf_get_block);
 240 }
 241
 242 static void udf_readahead(struct readahead_control *rac)
 243 {
 244         struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
 245
 246         /*
 247          * No readahead needed for in-ICB files and udf_get_block() would get
 248          * confused for such file anyway.
 249          */
 250         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 251                 return;
 252
 253         mpage_readahead(rac, udf_get_block);
 254 }
 255
 256 static int udf_write_begin(struct file *file, struct address_space *mapping,
 257                            loff_t pos, unsigned len,
 258                            struct page **pagep, void **fsdata)
 259 {
 260         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 261         struct page *page;
 262         int ret;
 263
 264         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 265                 ret = block_write_begin(mapping, pos, len, pagep,
 266                                         udf_get_block);
 267                 if (unlikely(ret))
 268                         udf_write_failed(mapping, pos + len);
 269                 return ret;
 270         }
 271         if (WARN_ON_ONCE(pos >= PAGE_SIZE))
 272                 return -EIO;
 273         page = grab_cache_page_write_begin(mapping, 0);
 274         if (!page)
 275                 return -ENOMEM;
 276         *pagep = page;
 277         if (!PageUptodate(page))
 278                 udf_adinicb_readpage(page);
 279         return 0;
 280 }
 281
 282 static int udf_write_end(struct file *file, struct address_space *mapping,
 283                          loff_t pos, unsigned len, unsigned copied,
 284                          struct page *page, void *fsdata)
 285 {
 286         struct inode *inode = file_inode(file);
 287         loff_t last_pos;
 288
 289         if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 290                 return generic_write_end(file, mapping, pos, len, copied, page,
 291                                          fsdata);
 292         last_pos = pos + copied;
 293         if (last_pos > inode->i_size)
 294                 i_size_write(inode, last_pos);
 295         set_page_dirty(page);
 296         unlock_page(page);
 297         put_page(page);
 298
 299         return copied;
 300 }
 301
 302 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 303 {
 304         struct file *file = iocb->ki_filp;
 305         struct address_space *mapping = file->f_mapping;
 306         struct inode *inode = mapping->host;
 307         size_t count = iov_iter_count(iter);
 308         ssize_t ret;
 309
 310         /* Fallback to buffered IO for in-ICB files */
 311         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 312                 return 0;
 313         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 314         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 315                 udf_write_failed(mapping, iocb->ki_pos + count);
 316         return ret;
 317 }
 318
 319 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 320 {
 321         struct udf_inode_info *iinfo = UDF_I(mapping->host);
 322
 323         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 324                 return -EINVAL;
 325         return generic_block_bmap(mapping, block, udf_get_block);
 326 }
 327
 328 const struct address_space_operations udf_aops = {
 329         .dirty_folio    = block_dirty_folio,
 330         .invalidate_folio = block_invalidate_folio,
 331         .read_folio     = udf_read_folio,
 332         .readahead      = udf_readahead,
 333         .writepages     = udf_writepages,
 334         .write_begin    = udf_write_begin,
 335         .write_end      = udf_write_end,
 336         .direct_IO      = udf_direct_IO,
 337         .bmap           = udf_bmap,
 338         .migrate_folio  = buffer_migrate_folio,
 339 };
 340
 341 /*
 342  * Expand file stored in ICB to a normal one-block-file
 343  *
 344  * This function requires i_mutex held
 345  */
 346 int udf_expand_file_adinicb(struct inode *inode)
 347 {
 348         struct page *page;
 349         struct udf_inode_info *iinfo = UDF_I(inode);
 350         int err;
 351
 352         WARN_ON_ONCE(!inode_is_locked(inode));
 353         if (!iinfo->i_lenAlloc) {
 354                 down_write(&iinfo->i_data_sem);
 355                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 356                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 357                 else
 358                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 359                 /* from now on we have normal address_space methods */
 360                 inode->i_data.a_ops = &udf_aops;
 361                 up_write(&iinfo->i_data_sem);
 362                 mark_inode_dirty(inode);
 363                 return 0;
 364         }
 365
 366         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 367         if (!page)
 368                 return -ENOMEM;
 369
 370         if (!PageUptodate(page))
 371                 udf_adinicb_readpage(page);
 372         down_write(&iinfo->i_data_sem);
 373         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 374                iinfo->i_lenAlloc);
 375         iinfo->i_lenAlloc = 0;
 376         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 377                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 378         else
 379                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 380         set_page_dirty(page);
 381         unlock_page(page);
 382         up_write(&iinfo->i_data_sem);
 383         err = filemap_fdatawrite(inode->i_mapping);
 384         if (err) {
 385                 /* Restore everything back so that we don't lose data... */
 386                 lock_page(page);
 387                 down_write(&iinfo->i_data_sem);
 388                 memcpy_to_page(page, 0, iinfo->i_data + iinfo->i_lenEAttr,
 389                                inode->i_size);
 390                 unlock_page(page);
 391                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 392                 iinfo->i_lenAlloc = inode->i_size;
 393                 up_write(&iinfo->i_data_sem);
 394         }
 395         put_page(page);
 396         mark_inode_dirty(inode);
 397
 398         return err;
 399 }
 400
 401 #define UDF_MAP_CREATE          0x01    /* Mapping can allocate new blocks */
 402 #define UDF_MAP_NOPREALLOC      0x02    /* Do not preallocate blocks */
 403
 404 #define UDF_BLK_MAPPED  0x01    /* Block was successfully mapped */
 405 #define UDF_BLK_NEW     0x02    /* Block was freshly allocated */
 406
 407 struct udf_map_rq {
 408         sector_t lblk;
 409         udf_pblk_t pblk;
 410         int iflags;             /* UDF_MAP_ flags determining behavior */
 411         int oflags;             /* UDF_BLK_ flags reporting results */
 412 };
 413
 414 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
 415 {
 416         int err;
 417         struct udf_inode_info *iinfo = UDF_I(inode);
 418
 419         if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
 420                 return -EFSCORRUPTED;
 421
 422         map->oflags = 0;
 423         if (!(map->iflags & UDF_MAP_CREATE)) {
 424                 struct kernel_lb_addr eloc;
 425                 uint32_t elen;
 426                 sector_t offset;
 427                 struct extent_position epos = {};
 428
 429                 down_read(&iinfo->i_data_sem);
 430                 if (inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset)
 431                                 == (EXT_RECORDED_ALLOCATED >> 30)) {
 432                         map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
 433                                                         offset);
 434                         map->oflags |= UDF_BLK_MAPPED;
 435                 }
 436                 up_read(&iinfo->i_data_sem);
 437                 brelse(epos.bh);
 438
 439                 return 0;
 440         }
 441
 442         down_write(&iinfo->i_data_sem);
 443         /*
 444          * Block beyond EOF and prealloc extents? Just discard preallocation
 445          * as it is not useful and complicates things.
 446          */
 447         if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
 448                 udf_discard_prealloc(inode);
 449         udf_clear_extent_cache(inode);
 450         err = inode_getblk(inode, map);
 451         up_write(&iinfo->i_data_sem);
 452         return err;
 453 }
 454
 455 static int __udf_get_block(struct inode *inode, sector_t block,
 456                            struct buffer_head *bh_result, int flags)
 457 {
 458         int err;
 459         struct udf_map_rq map = {
 460                 .lblk = block,
 461                 .iflags = flags,
 462         };
 463
 464         err = udf_map_block(inode, &map);
 465         if (err < 0)
 466                 return err;
 467         if (map.oflags & UDF_BLK_MAPPED) {
 468                 map_bh(bh_result, inode->i_sb, map.pblk);
 469                 if (map.oflags & UDF_BLK_NEW)
 470                         set_buffer_new(bh_result);
 471         }
 472         return 0;
 473 }
 474
 475 int udf_get_block(struct inode *inode, sector_t block,
 476                   struct buffer_head *bh_result, int create)
 477 {
 478         int flags = create ? UDF_MAP_CREATE : 0;
 479
 480         /*
 481          * We preallocate blocks only for regular files. It also makes sense
 482          * for directories but there's a problem when to drop the
 483          * preallocation. We might use some delayed work for that but I feel
 484          * it's overengineering for a filesystem like UDF.
 485          */
 486         if (!S_ISREG(inode->i_mode))
 487                 flags |= UDF_MAP_NOPREALLOC;
 488         return __udf_get_block(inode, block, bh_result, flags);
 489 }
 490
 491 /*
 492  * We shouldn't be allocating blocks on page writeback since we allocate them
 493  * on page fault. We can spot dirty buffers without allocated blocks though
 494  * when truncate expands file. These however don't have valid data so we can
 495  * safely ignore them. So never allocate blocks from page writeback.
 496  */
 497 static int udf_get_block_wb(struct inode *inode, sector_t block,
 498                             struct buffer_head *bh_result, int create)
 499 {
 500         return __udf_get_block(inode, block, bh_result, 0);
 501 }
 502
 503 /* Extend the file with new blocks totaling 'new_block_bytes',
 504  * return the number of extents added
 505  */
 506 static int udf_do_extend_file(struct inode *inode,
 507                               struct extent_position *last_pos,
 508                               struct kernel_long_ad *last_ext,
 509                               loff_t new_block_bytes)
 510 {
 511         uint32_t add;
 512         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 513         struct super_block *sb = inode->i_sb;
 514         struct udf_inode_info *iinfo;
 515         int err;
 516
 517         /* The previous extent is fake and we should not extend by anything
 518          * - there's nothing to do... */
 519         if (!new_block_bytes && fake)
 520                 return 0;
 521
 522         iinfo = UDF_I(inode);
 523         /* Round the last extent up to a multiple of block size */
 524         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 525                 last_ext->extLength =
 526                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 527                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 528                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 529                 iinfo->i_lenExtents =
 530                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 531                         ~(sb->s_blocksize - 1);
 532         }
 533
 534         add = 0;
 535         /* Can we merge with the previous extent? */
 536         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 537                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 538                 add = (1 << 30) - sb->s_blocksize -
 539                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 540                 if (add > new_block_bytes)
 541                         add = new_block_bytes;
 542                 new_block_bytes -= add;
 543                 last_ext->extLength += add;
 544         }
 545
 546         if (fake) {
 547                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 548                                    last_ext->extLength, 1);
 549                 if (err < 0)
 550                         goto out_err;
 551                 count++;
 552         } else {
 553                 struct kernel_lb_addr tmploc;
 554                 uint32_t tmplen;
 555
 556                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 557                                 last_ext->extLength, 1);
 558
 559                 /*
 560                  * We've rewritten the last extent. If we are going to add
 561                  * more extents, we may need to enter possible following
 562                  * empty indirect extent.
 563                  */
 564                 if (new_block_bytes)
 565                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 566         }
 567         iinfo->i_lenExtents += add;
 568
 569         /* Managed to do everything necessary? */
 570         if (!new_block_bytes)
 571                 goto out;
 572
 573         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 574         last_ext->extLocation.logicalBlockNum = 0;
 575         last_ext->extLocation.partitionReferenceNum = 0;
 576         add = (1 << 30) - sb->s_blocksize;
 577         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 578
 579         /* Create enough extents to cover the whole hole */
 580         while (new_block_bytes > add) {
 581                 new_block_bytes -= add;
 582                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 583                                    last_ext->extLength, 1);
 584                 if (err)
 585                         goto out_err;
 586                 iinfo->i_lenExtents += add;
 587                 count++;
 588         }
 589         if (new_block_bytes) {
 590                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 591                         new_block_bytes;
 592                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 593                                    last_ext->extLength, 1);
 594                 if (err)
 595                         goto out_err;
 596                 iinfo->i_lenExtents += new_block_bytes;
 597                 count++;
 598         }
 599
 600 out:
 601         /* last_pos should point to the last written extent... */
 602         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 603                 last_pos->offset -= sizeof(struct short_ad);
 604         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 605                 last_pos->offset -= sizeof(struct long_ad);
 606         else
 607                 return -EIO;
 608
 609         return count;
 610 out_err:
 611         /* Remove extents we've created so far */
 612         udf_clear_extent_cache(inode);
 613         udf_truncate_extents(inode);
 614         return err;
 615 }
 616
 617 /* Extend the final block of the file to final_block_len bytes */
 618 static void udf_do_extend_final_block(struct inode *inode,
 619                                       struct extent_position *last_pos,
 620                                       struct kernel_long_ad *last_ext,
 621                                       uint32_t new_elen)
 622 {
 623         uint32_t added_bytes;
 624
 625         /*
 626          * Extent already large enough? It may be already rounded up to block
 627          * size...
 628          */
 629         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 630                 return;
 631         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 632         last_ext->extLength += added_bytes;
 633         UDF_I(inode)->i_lenExtents += added_bytes;
 634
 635         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 636                         last_ext->extLength, 1);
 637 }
 638
 639 static int udf_extend_file(struct inode *inode, loff_t newsize)
 640 {
 641
 642         struct extent_position epos;
 643         struct kernel_lb_addr eloc;
 644         uint32_t elen;
 645         int8_t etype;
 646         struct super_block *sb = inode->i_sb;
 647         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 648         loff_t new_elen;
 649         int adsize;
 650         struct udf_inode_info *iinfo = UDF_I(inode);
 651         struct kernel_long_ad extent;
 652         int err = 0;
 653         bool within_last_ext;
 654
 655         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 656                 adsize = sizeof(struct short_ad);
 657         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 658                 adsize = sizeof(struct long_ad);
 659         else
 660                 BUG();
 661
 662         down_write(&iinfo->i_data_sem);
 663         /*
 664          * When creating hole in file, just don't bother with preserving
 665          * preallocation. It likely won't be very useful anyway.
 666          */
 667         udf_discard_prealloc(inode);
 668
 669         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 670         within_last_ext = (etype != -1);
 671         /* We don't expect extents past EOF... */
 672         WARN_ON_ONCE(within_last_ext &&
 673                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 674
 675         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 676             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 677                 /* File has no extents at all or has empty last
 678                  * indirect extent! Create a fake extent... */
 679                 extent.extLocation.logicalBlockNum = 0;
 680                 extent.extLocation.partitionReferenceNum = 0;
 681                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 682         } else {
 683                 epos.offset -= adsize;
 684                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 685                                       &extent.extLength, 0);
 686                 extent.extLength |= etype << 30;
 687         }
 688
 689         new_elen = ((loff_t)offset << inode->i_blkbits) |
 690                                         (newsize & (sb->s_blocksize - 1));
 691
 692         /* File has extent covering the new size (could happen when extending
 693          * inside a block)?
 694          */
 695         if (within_last_ext) {
 696                 /* Extending file within the last file block */
 697                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 698         } else {
 699                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 700         }
 701
 702         if (err < 0)
 703                 goto out;
 704         err = 0;
 705 out:
 706         brelse(epos.bh);
 707         up_write(&iinfo->i_data_sem);
 708         return err;
 709 }
 710
 711 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
 712 {
 713         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 714         struct extent_position prev_epos, cur_epos, next_epos;
 715         int count = 0, startnum = 0, endnum = 0;
 716         uint32_t elen = 0, tmpelen;
 717         struct kernel_lb_addr eloc, tmpeloc;
 718         int c = 1;
 719         loff_t lbcount = 0, b_off = 0;
 720         udf_pblk_t newblocknum;
 721         sector_t offset = 0;
 722         int8_t etype;
 723         struct udf_inode_info *iinfo = UDF_I(inode);
 724         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 725         int lastblock = 0;
 726         bool isBeyondEOF;
 727         int ret = 0;
 728
 729         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 730         prev_epos.block = iinfo->i_location;
 731         prev_epos.bh = NULL;
 732         cur_epos = next_epos = prev_epos;
 733         b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
 734
 735         /* find the extent which contains the block we are looking for.
 736            alternate between laarr[0] and laarr[1] for locations of the
 737            current extent, and the previous extent */
 738         do {
 739                 if (prev_epos.bh != cur_epos.bh) {
 740                         brelse(prev_epos.bh);
 741                         get_bh(cur_epos.bh);
 742                         prev_epos.bh = cur_epos.bh;
 743                 }
 744                 if (cur_epos.bh != next_epos.bh) {
 745                         brelse(cur_epos.bh);
 746                         get_bh(next_epos.bh);
 747                         cur_epos.bh = next_epos.bh;
 748                 }
 749
 750                 lbcount += elen;
 751
 752                 prev_epos.block = cur_epos.block;
 753                 cur_epos.block = next_epos.block;
 754
 755                 prev_epos.offset = cur_epos.offset;
 756                 cur_epos.offset = next_epos.offset;
 757
 758                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 759                 if (etype == -1)
 760                         break;
 761
 762                 c = !c;
 763
 764                 laarr[c].extLength = (etype << 30) | elen;
 765                 laarr[c].extLocation = eloc;
 766
 767                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 768                         pgoal = eloc.logicalBlockNum +
 769                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 770                                  inode->i_sb->s_blocksize_bits);
 771
 772                 count++;
 773         } while (lbcount + elen <= b_off);
 774
 775         b_off -= lbcount;
 776         offset = b_off >> inode->i_sb->s_blocksize_bits;
 777         /*
 778          * Move prev_epos and cur_epos into indirect extent if we are at
 779          * the pointer to it
 780          */
 781         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 782         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 783
 784         /* if the extent is allocated and recorded, return the block
 785            if the extent is not a multiple of the blocksize, round up */
 786
 787         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 788                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 789                         elen = EXT_RECORDED_ALLOCATED |
 790                                 ((elen + inode->i_sb->s_blocksize - 1) &
 791                                  ~(inode->i_sb->s_blocksize - 1));
 792                         iinfo->i_lenExtents =
 793                                 ALIGN(iinfo->i_lenExtents,
 794                                       inode->i_sb->s_blocksize);
 795                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 796                 }
 797                 map->oflags = UDF_BLK_MAPPED;
 798                 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 799                 goto out_free;
 800         }
 801
 802         /* Are we beyond EOF and preallocated extent? */
 803         if (etype == -1) {
 804                 loff_t hole_len;
 805
 806                 isBeyondEOF = true;
 807                 if (count) {
 808                         if (c)
 809                                 laarr[0] = laarr[1];
 810                         startnum = 1;
 811                 } else {
 812                         /* Create a fake extent when there's not one */
 813                         memset(&laarr[0].extLocation, 0x00,
 814                                 sizeof(struct kernel_lb_addr));
 815                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 816                         /* Will udf_do_extend_file() create real extent from
 817                            a fake one? */
 818                         startnum = (offset > 0);
 819                 }
 820                 /* Create extents for the hole between EOF and offset */
 821                 hole_len = (loff_t)offset << inode->i_blkbits;
 822                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 823                 if (ret < 0)
 824                         goto out_free;
 825                 c = 0;
 826                 offset = 0;
 827                 count += ret;
 828                 /*
 829                  * Is there any real extent? - otherwise we overwrite the fake
 830                  * one...
 831                  */
 832                 if (count)
 833                         c = !c;
 834                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 835                         inode->i_sb->s_blocksize;
 836                 memset(&laarr[c].extLocation, 0x00,
 837                         sizeof(struct kernel_lb_addr));
 838                 count++;
 839                 endnum = c + 1;
 840                 lastblock = 1;
 841         } else {
 842                 isBeyondEOF = false;
 843                 endnum = startnum = ((count > 2) ? 2 : count);
 844
 845                 /* if the current extent is in position 0,
 846                    swap it with the previous */
 847                 if (!c && count != 1) {
 848                         laarr[2] = laarr[0];
 849                         laarr[0] = laarr[1];
 850                         laarr[1] = laarr[2];
 851                         c = 1;
 852                 }
 853
 854                 /* if the current block is located in an extent,
 855                    read the next extent */
 856                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 857                 if (etype != -1) {
 858                         laarr[c + 1].extLength = (etype << 30) | elen;
 859                         laarr[c + 1].extLocation = eloc;
 860                         count++;
 861                         startnum++;
 862                         endnum++;
 863                 } else
 864                         lastblock = 1;
 865         }
 866
 867         /* if the current extent is not recorded but allocated, get the
 868          * block in the extent corresponding to the requested block */
 869         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 870                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 871         else { /* otherwise, allocate a new block */
 872                 if (iinfo->i_next_alloc_block == map->lblk)
 873                         goal = iinfo->i_next_alloc_goal;
 874
 875                 if (!goal) {
 876                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 877                                 goal = iinfo->i_location.logicalBlockNum + 1;
 878                 }
 879
 880                 newblocknum = udf_new_block(inode->i_sb, inode,
 881                                 iinfo->i_location.partitionReferenceNum,
 882                                 goal, &ret);
 883                 if (!newblocknum)
 884                         goto out_free;
 885                 if (isBeyondEOF)
 886                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 887         }
 888
 889         /* if the extent the requsted block is located in contains multiple
 890          * blocks, split the extent into at most three extents. blocks prior
 891          * to requested block, requested block, and blocks after requested
 892          * block */
 893         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 894
 895         if (!(map->iflags & UDF_MAP_NOPREALLOC))
 896                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 897
 898         /* merge any continuous blocks in laarr */
 899         udf_merge_extents(inode, laarr, &endnum);
 900
 901         /* write back the new extents, inserting new extents if the new number
 902          * of extents is greater than the old number, and deleting extents if
 903          * the new number of extents is less than the old number */
 904         ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 905         if (ret < 0)
 906                 goto out_free;
 907
 908         map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
 909                                 iinfo->i_location.partitionReferenceNum, 0);
 910         if (!map->pblk) {
 911                 ret = -EFSCORRUPTED;
 912                 goto out_free;
 913         }
 914         map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
 915         iinfo->i_next_alloc_block = map->lblk + 1;
 916         iinfo->i_next_alloc_goal = newblocknum + 1;
 917         inode->i_ctime = current_time(inode);
 918
 919         if (IS_SYNC(inode))
 920                 udf_sync_inode(inode);
 921         else
 922                 mark_inode_dirty(inode);
 923         ret = 0;
 924 out_free:
 925         brelse(prev_epos.bh);
 926         brelse(cur_epos.bh);
 927         brelse(next_epos.bh);
 928         return ret;
 929 }
 930
 931 static void udf_split_extents(struct inode *inode, int *c, int offset,
 932                                udf_pblk_t newblocknum,
 933                                struct kernel_long_ad *laarr, int *endnum)
 934 {
 935         unsigned long blocksize = inode->i_sb->s_blocksize;
 936         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 937
 938         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 939             (laarr[*c].extLength >> 30) ==
 940                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 941                 int curr = *c;
 942                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 943                             blocksize - 1) >> blocksize_bits;
 944                 int8_t etype = (laarr[curr].extLength >> 30);
 945
 946                 if (blen == 1)
 947                         ;
 948                 else if (!offset || blen == offset + 1) {
 949                         laarr[curr + 2] = laarr[curr + 1];
 950                         laarr[curr + 1] = laarr[curr];
 951                 } else {
 952                         laarr[curr + 3] = laarr[curr + 1];
 953                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 954                 }
 955
 956                 if (offset) {
 957                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 958                                 udf_free_blocks(inode->i_sb, inode,
 959                                                 &laarr[curr].extLocation,
 960                                                 0, offset);
 961                                 laarr[curr].extLength =
 962                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 963                                         (offset << blocksize_bits);
 964                                 laarr[curr].extLocation.logicalBlockNum = 0;
 965                                 laarr[curr].extLocation.
 966                                                 partitionReferenceNum = 0;
 967                         } else
 968                                 laarr[curr].extLength = (etype << 30) |
 969                                         (offset << blocksize_bits);
 970                         curr++;
 971                         (*c)++;
 972                         (*endnum)++;
 973                 }
 974
 975                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 976                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 977                         laarr[curr].extLocation.partitionReferenceNum =
 978                                 UDF_I(inode)->i_location.partitionReferenceNum;
 979                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 980                         blocksize;
 981                 curr++;
 982
 983                 if (blen != offset + 1) {
 984                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 985                                 laarr[curr].extLocation.logicalBlockNum +=
 986                                                                 offset + 1;
 987                         laarr[curr].extLength = (etype << 30) |
 988                                 ((blen - (offset + 1)) << blocksize_bits);
 989                         curr++;
 990                         (*endnum)++;
 991                 }
 992         }
 993 }
 994
 995 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 996                                  struct kernel_long_ad *laarr,
 997                                  int *endnum)
 998 {
 999         int start, length = 0, currlength = 0, i;
1000
1001         if (*endnum >= (c + 1)) {
1002                 if (!lastblock)
1003                         return;
1004                 else
1005                         start = c;
1006         } else {
1007                 if ((laarr[c + 1].extLength >> 30) ==
1008                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1009                         start = c + 1;
1010                         length = currlength =
1011                                 (((laarr[c + 1].extLength &
1012                                         UDF_EXTENT_LENGTH_MASK) +
1013                                 inode->i_sb->s_blocksize - 1) >>
1014                                 inode->i_sb->s_blocksize_bits);
1015                 } else
1016                         start = c;
1017         }
1018
1019         for (i = start + 1; i <= *endnum; i++) {
1020                 if (i == *endnum) {
1021                         if (lastblock)
1022                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1023                 } else if ((laarr[i].extLength >> 30) ==
1024                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1025                         length += (((laarr[i].extLength &
1026                                                 UDF_EXTENT_LENGTH_MASK) +
1027                                     inode->i_sb->s_blocksize - 1) >>
1028                                     inode->i_sb->s_blocksize_bits);
1029                 } else
1030                         break;
1031         }
1032
1033         if (length) {
1034                 int next = laarr[start].extLocation.logicalBlockNum +
1035                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1036                           inode->i_sb->s_blocksize - 1) >>
1037                           inode->i_sb->s_blocksize_bits);
1038                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1039                                 laarr[start].extLocation.partitionReferenceNum,
1040                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1041                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1042                                 currlength);
1043                 if (numalloc)   {
1044                         if (start == (c + 1))
1045                                 laarr[start].extLength +=
1046                                         (numalloc <<
1047                                          inode->i_sb->s_blocksize_bits);
1048                         else {
1049                                 memmove(&laarr[c + 2], &laarr[c + 1],
1050                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1051                                 (*endnum)++;
1052                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1053                                 laarr[c + 1].extLocation.partitionReferenceNum =
1054                                         laarr[c].extLocation.
1055                                                         partitionReferenceNum;
1056                                 laarr[c + 1].extLength =
1057                                         EXT_NOT_RECORDED_ALLOCATED |
1058                                         (numalloc <<
1059                                          inode->i_sb->s_blocksize_bits);
1060                                 start = c + 1;
1061                         }
1062
1063                         for (i = start + 1; numalloc && i < *endnum; i++) {
1064                                 int elen = ((laarr[i].extLength &
1065                                                 UDF_EXTENT_LENGTH_MASK) +
1066                                             inode->i_sb->s_blocksize - 1) >>
1067                                             inode->i_sb->s_blocksize_bits;
1068
1069                                 if (elen > numalloc) {
1070                                         laarr[i].extLength -=
1071                                                 (numalloc <<
1072                                                  inode->i_sb->s_blocksize_bits);
1073                                         numalloc = 0;
1074                                 } else {
1075                                         numalloc -= elen;
1076                                         if (*endnum > (i + 1))
1077                                                 memmove(&laarr[i],
1078                                                         &laarr[i + 1],
1079                                                         sizeof(struct long_ad) *
1080                                                         (*endnum - (i + 1)));
1081                                         i--;
1082                                         (*endnum)--;
1083                                 }
1084                         }
1085                         UDF_I(inode)->i_lenExtents +=
1086                                 numalloc << inode->i_sb->s_blocksize_bits;
1087                 }
1088         }
1089 }
1090
1091 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1092                               int *endnum)
1093 {
1094         int i;
1095         unsigned long blocksize = inode->i_sb->s_blocksize;
1096         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1097
1098         for (i = 0; i < (*endnum - 1); i++) {
1099                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1100                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1101
1102                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1103                         (((li->extLength >> 30) ==
1104                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1105                         ((lip1->extLocation.logicalBlockNum -
1106                           li->extLocation.logicalBlockNum) ==
1107                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1108                         blocksize - 1) >> blocksize_bits)))) {
1109
1110                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1111                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1112                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1113                                 li->extLength = lip1->extLength +
1114                                         (((li->extLength &
1115                                                 UDF_EXTENT_LENGTH_MASK) +
1116                                          blocksize - 1) & ~(blocksize - 1));
1117                                 if (*endnum > (i + 2))
1118                                         memmove(&laarr[i + 1], &laarr[i + 2],
1119                                                 sizeof(struct long_ad) *
1120                                                 (*endnum - (i + 2)));
1121                                 i--;
1122                                 (*endnum)--;
1123                         }
1124                 } else if (((li->extLength >> 30) ==
1125                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1126                            ((lip1->extLength >> 30) ==
1127                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1128                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1129                                         ((li->extLength &
1130                                           UDF_EXTENT_LENGTH_MASK) +
1131                                          blocksize - 1) >> blocksize_bits);
1132                         li->extLocation.logicalBlockNum = 0;
1133                         li->extLocation.partitionReferenceNum = 0;
1134
1135                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1136                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1137                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1138                                 lip1->extLength = (lip1->extLength -
1139                                                    (li->extLength &
1140                                                    UDF_EXTENT_LENGTH_MASK) +
1141                                                    UDF_EXTENT_LENGTH_MASK) &
1142                                                    ~(blocksize - 1);
1143                                 li->extLength = (li->extLength &
1144                                                  UDF_EXTENT_FLAG_MASK) +
1145                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1146                                                 blocksize;
1147                         } else {
1148                                 li->extLength = lip1->extLength +
1149                                         (((li->extLength &
1150                                                 UDF_EXTENT_LENGTH_MASK) +
1151                                           blocksize - 1) & ~(blocksize - 1));
1152                                 if (*endnum > (i + 2))
1153                                         memmove(&laarr[i + 1], &laarr[i + 2],
1154                                                 sizeof(struct long_ad) *
1155                                                 (*endnum - (i + 2)));
1156                                 i--;
1157                                 (*endnum)--;
1158                         }
1159                 } else if ((li->extLength >> 30) ==
1160                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1161                         udf_free_blocks(inode->i_sb, inode,
1162                                         &li->extLocation, 0,
1163                                         ((li->extLength &
1164                                                 UDF_EXTENT_LENGTH_MASK) +
1165                                          blocksize - 1) >> blocksize_bits);
1166                         li->extLocation.logicalBlockNum = 0;
1167                         li->extLocation.partitionReferenceNum = 0;
1168                         li->extLength = (li->extLength &
1169                                                 UDF_EXTENT_LENGTH_MASK) |
1170                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1171                 }
1172         }
1173 }
1174
1175 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1176                               int startnum, int endnum,
1177                               struct extent_position *epos)
1178 {
1179         int start = 0, i;
1180         struct kernel_lb_addr tmploc;
1181         uint32_t tmplen;
1182         int err;
1183
1184         if (startnum > endnum) {
1185                 for (i = 0; i < (startnum - endnum); i++)
1186                         udf_delete_aext(inode, *epos);
1187         } else if (startnum < endnum) {
1188                 for (i = 0; i < (endnum - startnum); i++) {
1189                         err = udf_insert_aext(inode, *epos,
1190                                               laarr[i].extLocation,
1191                                               laarr[i].extLength);
1192                         /*
1193                          * If we fail here, we are likely corrupting the extent
1194                          * list and leaking blocks. At least stop early to
1195                          * limit the damage.
1196                          */
1197                         if (err < 0)
1198                                 return err;
1199                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1200                                       &laarr[i].extLength, 1);
1201                         start++;
1202                 }
1203         }
1204
1205         for (i = start; i < endnum; i++) {
1206                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1207                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1208                                laarr[i].extLength, 1);
1209         }
1210         return 0;
1211 }
1212
1213 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1214                               int create, int *err)
1215 {
1216         struct buffer_head *bh = NULL;
1217         struct udf_map_rq map = {
1218                 .lblk = block,
1219                 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1220         };
1221
1222         *err = udf_map_block(inode, &map);
1223         if (*err || !(map.oflags & UDF_BLK_MAPPED))
1224                 return NULL;
1225
1226         bh = sb_getblk(inode->i_sb, map.pblk);
1227         if (!bh) {
1228                 *err = -ENOMEM;
1229                 return NULL;
1230         }
1231         if (map.oflags & UDF_BLK_NEW) {
1232                 lock_buffer(bh);
1233                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1234                 set_buffer_uptodate(bh);
1235                 unlock_buffer(bh);
1236                 mark_buffer_dirty_inode(bh, inode);
1237                 return bh;
1238         }
1239
1240         if (bh_read(bh, 0) >= 0)
1241                 return bh;
1242
1243         brelse(bh);
1244         *err = -EIO;
1245         return NULL;
1246 }
1247
1248 int udf_setsize(struct inode *inode, loff_t newsize)
1249 {
1250         int err = 0;
1251         struct udf_inode_info *iinfo;
1252         unsigned int bsize = i_blocksize(inode);
1253
1254         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1255               S_ISLNK(inode->i_mode)))
1256                 return -EINVAL;
1257         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1258                 return -EPERM;
1259
1260         filemap_invalidate_lock(inode->i_mapping);
1261         iinfo = UDF_I(inode);
1262         if (newsize > inode->i_size) {
1263                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1264                         if (bsize >=
1265                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1266                                 down_write(&iinfo->i_data_sem);
1267                                 iinfo->i_lenAlloc = newsize;
1268                                 up_write(&iinfo->i_data_sem);
1269                                 goto set_size;
1270                         }
1271                         err = udf_expand_file_adinicb(inode);
1272                         if (err)
1273                                 goto out_unlock;
1274                 }
1275                 err = udf_extend_file(inode, newsize);
1276                 if (err)
1277                         goto out_unlock;
1278 set_size:
1279                 truncate_setsize(inode, newsize);
1280         } else {
1281                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1282                         down_write(&iinfo->i_data_sem);
1283                         udf_clear_extent_cache(inode);
1284                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1285                                0x00, bsize - newsize -
1286                                udf_file_entry_alloc_offset(inode));
1287                         iinfo->i_lenAlloc = newsize;
1288                         truncate_setsize(inode, newsize);
1289                         up_write(&iinfo->i_data_sem);
1290                         goto update_time;
1291                 }
1292                 err = block_truncate_page(inode->i_mapping, newsize,
1293                                           udf_get_block);
1294                 if (err)
1295                         goto out_unlock;
1296                 truncate_setsize(inode, newsize);
1297                 down_write(&iinfo->i_data_sem);
1298                 udf_clear_extent_cache(inode);
1299                 err = udf_truncate_extents(inode);
1300                 up_write(&iinfo->i_data_sem);
1301                 if (err)
1302                         goto out_unlock;
1303         }
1304 update_time:
1305         inode->i_mtime = inode->i_ctime = current_time(inode);
1306         if (IS_SYNC(inode))
1307                 udf_sync_inode(inode);
1308         else
1309                 mark_inode_dirty(inode);
1310 out_unlock:
1311         filemap_invalidate_unlock(inode->i_mapping);
1312         return err;
1313 }
1314
1315 /*
1316  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1317  * arbitrary - just that we hopefully don't limit any real use of rewritten
1318  * inode on write-once media but avoid looping for too long on corrupted media.
1319  */
1320 #define UDF_MAX_ICB_NESTING 1024
1321
1322 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1323 {
1324         struct buffer_head *bh = NULL;
1325         struct fileEntry *fe;
1326         struct extendedFileEntry *efe;
1327         uint16_t ident;
1328         struct udf_inode_info *iinfo = UDF_I(inode);
1329         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1330         struct kernel_lb_addr *iloc = &iinfo->i_location;
1331         unsigned int link_count;
1332         unsigned int indirections = 0;
1333         int bs = inode->i_sb->s_blocksize;
1334         int ret = -EIO;
1335         uint32_t uid, gid;
1336
1337 reread:
1338         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1339                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1340                           iloc->partitionReferenceNum, sbi->s_partitions);
1341                 return -EIO;
1342         }
1343
1344         if (iloc->logicalBlockNum >=
1345             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1346                 udf_debug("block=%u, partition=%u out of range\n",
1347                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1348                 return -EIO;
1349         }
1350
1351         /*
1352          * Set defaults, but the inode is still incomplete!
1353          * Note: get_new_inode() sets the following on a new inode:
1354          *      i_sb = sb
1355          *      i_no = ino
1356          *      i_flags = sb->s_flags
1357          *      i_state = 0
1358          * clean_inode(): zero fills and sets
1359          *      i_count = 1
1360          *      i_nlink = 1
1361          *      i_op = NULL;
1362          */
1363         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1364         if (!bh) {
1365                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1366                 return -EIO;
1367         }
1368
1369         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1370             ident != TAG_IDENT_USE) {
1371                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1372                         inode->i_ino, ident);
1373                 goto out;
1374         }
1375
1376         fe = (struct fileEntry *)bh->b_data;
1377         efe = (struct extendedFileEntry *)bh->b_data;
1378
1379         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1380                 struct buffer_head *ibh;
1381
1382                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1383                 if (ident == TAG_IDENT_IE && ibh) {
1384                         struct kernel_lb_addr loc;
1385                         struct indirectEntry *ie;
1386
1387                         ie = (struct indirectEntry *)ibh->b_data;
1388                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1389
1390                         if (ie->indirectICB.extLength) {
1391                                 brelse(ibh);
1392                                 memcpy(&iinfo->i_location, &loc,
1393                                        sizeof(struct kernel_lb_addr));
1394                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1395                                         udf_err(inode->i_sb,
1396                                                 "too many ICBs in ICB hierarchy"
1397                                                 " (max %d supported)\n",
1398                                                 UDF_MAX_ICB_NESTING);
1399                                         goto out;
1400                                 }
1401                                 brelse(bh);
1402                                 goto reread;
1403                         }
1404                 }
1405                 brelse(ibh);
1406         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1407                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1408                         le16_to_cpu(fe->icbTag.strategyType));
1409                 goto out;
1410         }
1411         if (fe->icbTag.strategyType == cpu_to_le16(4))
1412                 iinfo->i_strat4096 = 0;
1413         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1414                 iinfo->i_strat4096 = 1;
1415
1416         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1417                                                         ICBTAG_FLAG_AD_MASK;
1418         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1419             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1420             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1421                 ret = -EIO;
1422                 goto out;
1423         }
1424         iinfo->i_hidden = hidden_inode;
1425         iinfo->i_unique = 0;
1426         iinfo->i_lenEAttr = 0;
1427         iinfo->i_lenExtents = 0;
1428         iinfo->i_lenAlloc = 0;
1429         iinfo->i_next_alloc_block = 0;
1430         iinfo->i_next_alloc_goal = 0;
1431         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1432                 iinfo->i_efe = 1;
1433                 iinfo->i_use = 0;
1434                 ret = udf_alloc_i_data(inode, bs -
1435                                         sizeof(struct extendedFileEntry));
1436                 if (ret)
1437                         goto out;
1438                 memcpy(iinfo->i_data,
1439                        bh->b_data + sizeof(struct extendedFileEntry),
1440                        bs - sizeof(struct extendedFileEntry));
1441         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1442                 iinfo->i_efe = 0;
1443                 iinfo->i_use = 0;
1444                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1445                 if (ret)
1446                         goto out;
1447                 memcpy(iinfo->i_data,
1448                        bh->b_data + sizeof(struct fileEntry),
1449                        bs - sizeof(struct fileEntry));
1450         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1451                 iinfo->i_efe = 0;
1452                 iinfo->i_use = 1;
1453                 iinfo->i_lenAlloc = le32_to_cpu(
1454                                 ((struct unallocSpaceEntry *)bh->b_data)->
1455                                  lengthAllocDescs);
1456                 ret = udf_alloc_i_data(inode, bs -
1457                                         sizeof(struct unallocSpaceEntry));
1458                 if (ret)
1459                         goto out;
1460                 memcpy(iinfo->i_data,
1461                        bh->b_data + sizeof(struct unallocSpaceEntry),
1462                        bs - sizeof(struct unallocSpaceEntry));
1463                 return 0;
1464         }
1465
1466         ret = -EIO;
1467         read_lock(&sbi->s_cred_lock);
1468         uid = le32_to_cpu(fe->uid);
1469         if (uid == UDF_INVALID_ID ||
1470             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1471                 inode->i_uid = sbi->s_uid;
1472         else
1473                 i_uid_write(inode, uid);
1474
1475         gid = le32_to_cpu(fe->gid);
1476         if (gid == UDF_INVALID_ID ||
1477             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1478                 inode->i_gid = sbi->s_gid;
1479         else
1480                 i_gid_write(inode, gid);
1481
1482         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1483                         sbi->s_fmode != UDF_INVALID_MODE)
1484                 inode->i_mode = sbi->s_fmode;
1485         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1486                         sbi->s_dmode != UDF_INVALID_MODE)
1487                 inode->i_mode = sbi->s_dmode;
1488         else
1489                 inode->i_mode = udf_convert_permissions(fe);
1490         inode->i_mode &= ~sbi->s_umask;
1491         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1492
1493         read_unlock(&sbi->s_cred_lock);
1494
1495         link_count = le16_to_cpu(fe->fileLinkCount);
1496         if (!link_count) {
1497                 if (!hidden_inode) {
1498                         ret = -ESTALE;
1499                         goto out;
1500                 }
1501                 link_count = 1;
1502         }
1503         set_nlink(inode, link_count);
1504
1505         inode->i_size = le64_to_cpu(fe->informationLength);
1506         iinfo->i_lenExtents = inode->i_size;
1507
1508         if (iinfo->i_efe == 0) {
1509                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1510                         (inode->i_sb->s_blocksize_bits - 9);
1511
1512                 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1513                 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1514                 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1515
1516                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1517                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1518                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1519                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1520                 iinfo->i_streamdir = 0;
1521                 iinfo->i_lenStreams = 0;
1522         } else {
1523                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1524                     (inode->i_sb->s_blocksize_bits - 9);
1525
1526                 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1527                 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1528                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1529                 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1530
1531                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1532                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1533                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1534                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1535
1536                 /* Named streams */
1537                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1538                 iinfo->i_locStreamdir =
1539                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1540                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1541                 if (iinfo->i_lenStreams >= inode->i_size)
1542                         iinfo->i_lenStreams -= inode->i_size;
1543                 else
1544                         iinfo->i_lenStreams = 0;
1545         }
1546         inode->i_generation = iinfo->i_unique;
1547
1548         /*
1549          * Sanity check length of allocation descriptors and extended attrs to
1550          * avoid integer overflows
1551          */
1552         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1553                 goto out;
1554         /* Now do exact checks */
1555         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1556                 goto out;
1557         /* Sanity checks for files in ICB so that we don't get confused later */
1558         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1559                 /*
1560                  * For file in ICB data is stored in allocation descriptor
1561                  * so sizes should match
1562                  */
1563                 if (iinfo->i_lenAlloc != inode->i_size)
1564                         goto out;
1565                 /* File in ICB has to fit in there... */
1566                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1567                         goto out;
1568         }
1569
1570         switch (fe->icbTag.fileType) {
1571         case ICBTAG_FILE_TYPE_DIRECTORY:
1572                 inode->i_op = &udf_dir_inode_operations;
1573                 inode->i_fop = &udf_dir_operations;
1574                 inode->i_mode |= S_IFDIR;
1575                 inc_nlink(inode);
1576                 break;
1577         case ICBTAG_FILE_TYPE_REALTIME:
1578         case ICBTAG_FILE_TYPE_REGULAR:
1579         case ICBTAG_FILE_TYPE_UNDEF:
1580         case ICBTAG_FILE_TYPE_VAT20:
1581                 inode->i_data.a_ops = &udf_aops;
1582                 inode->i_op = &udf_file_inode_operations;
1583                 inode->i_fop = &udf_file_operations;
1584                 inode->i_mode |= S_IFREG;
1585                 break;
1586         case ICBTAG_FILE_TYPE_BLOCK:
1587                 inode->i_mode |= S_IFBLK;
1588                 break;
1589         case ICBTAG_FILE_TYPE_CHAR:
1590                 inode->i_mode |= S_IFCHR;
1591                 break;
1592         case ICBTAG_FILE_TYPE_FIFO:
1593                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1594                 break;
1595         case ICBTAG_FILE_TYPE_SOCKET:
1596                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1597                 break;
1598         case ICBTAG_FILE_TYPE_SYMLINK:
1599                 inode->i_data.a_ops = &udf_symlink_aops;
1600                 inode->i_op = &udf_symlink_inode_operations;
1601                 inode_nohighmem(inode);
1602                 inode->i_mode = S_IFLNK | 0777;
1603                 break;
1604         case ICBTAG_FILE_TYPE_MAIN:
1605                 udf_debug("METADATA FILE-----\n");
1606                 break;
1607         case ICBTAG_FILE_TYPE_MIRROR:
1608                 udf_debug("METADATA MIRROR FILE-----\n");
1609                 break;
1610         case ICBTAG_FILE_TYPE_BITMAP:
1611                 udf_debug("METADATA BITMAP FILE-----\n");
1612                 break;
1613         default:
1614                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1615                         inode->i_ino, fe->icbTag.fileType);
1616                 goto out;
1617         }
1618         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1619                 struct deviceSpec *dsea =
1620                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1621                 if (dsea) {
1622                         init_special_inode(inode, inode->i_mode,
1623                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1624                                       le32_to_cpu(dsea->minorDeviceIdent)));
1625                         /* Developer ID ??? */
1626                 } else
1627                         goto out;
1628         }
1629         ret = 0;
1630 out:
1631         brelse(bh);
1632         return ret;
1633 }
1634
1635 static int udf_alloc_i_data(struct inode *inode, size_t size)
1636 {
1637         struct udf_inode_info *iinfo = UDF_I(inode);
1638         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1639         if (!iinfo->i_data)
1640                 return -ENOMEM;
1641         return 0;
1642 }
1643
1644 static umode_t udf_convert_permissions(struct fileEntry *fe)
1645 {
1646         umode_t mode;
1647         uint32_t permissions;
1648         uint32_t flags;
1649
1650         permissions = le32_to_cpu(fe->permissions);
1651         flags = le16_to_cpu(fe->icbTag.flags);
1652
1653         mode =  ((permissions) & 0007) |
1654                 ((permissions >> 2) & 0070) |
1655                 ((permissions >> 4) & 0700) |
1656                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1657                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1658                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1659
1660         return mode;
1661 }
1662
1663 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1664 {
1665         struct udf_inode_info *iinfo = UDF_I(inode);
1666
1667         /*
1668          * UDF 2.01 sec. 3.3.3.3 Note 2:
1669          * In Unix, delete permission tracks write
1670          */
1671         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1672         if (mode & 0200)
1673                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1674         if (mode & 0020)
1675                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1676         if (mode & 0002)
1677                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1678 }
1679
1680 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1681 {
1682         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1683 }
1684
1685 static int udf_sync_inode(struct inode *inode)
1686 {
1687         return udf_update_inode(inode, 1);
1688 }
1689
1690 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1691 {
1692         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1693             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1694              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1695                 iinfo->i_crtime = time;
1696 }
1697
1698 static int udf_update_inode(struct inode *inode, int do_sync)
1699 {
1700         struct buffer_head *bh = NULL;
1701         struct fileEntry *fe;
1702         struct extendedFileEntry *efe;
1703         uint64_t lb_recorded;
1704         uint32_t udfperms;
1705         uint16_t icbflags;
1706         uint16_t crclen;
1707         int err = 0;
1708         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1709         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1710         struct udf_inode_info *iinfo = UDF_I(inode);
1711
1712         bh = sb_getblk(inode->i_sb,
1713                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1714         if (!bh) {
1715                 udf_debug("getblk failure\n");
1716                 return -EIO;
1717         }
1718
1719         lock_buffer(bh);
1720         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1721         fe = (struct fileEntry *)bh->b_data;
1722         efe = (struct extendedFileEntry *)bh->b_data;
1723
1724         if (iinfo->i_use) {
1725                 struct unallocSpaceEntry *use =
1726                         (struct unallocSpaceEntry *)bh->b_data;
1727
1728                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1729                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1730                        iinfo->i_data, inode->i_sb->s_blocksize -
1731                                         sizeof(struct unallocSpaceEntry));
1732                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1733                 crclen = sizeof(struct unallocSpaceEntry);
1734
1735                 goto finish;
1736         }
1737
1738         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1739                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1740         else
1741                 fe->uid = cpu_to_le32(i_uid_read(inode));
1742
1743         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1744                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1745         else
1746                 fe->gid = cpu_to_le32(i_gid_read(inode));
1747
1748         udfperms = ((inode->i_mode & 0007)) |
1749                    ((inode->i_mode & 0070) << 2) |
1750                    ((inode->i_mode & 0700) << 4);
1751
1752         udfperms |= iinfo->i_extraPerms;
1753         fe->permissions = cpu_to_le32(udfperms);
1754
1755         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1756                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1757         else {
1758                 if (iinfo->i_hidden)
1759                         fe->fileLinkCount = cpu_to_le16(0);
1760                 else
1761                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1762         }
1763
1764         fe->informationLength = cpu_to_le64(inode->i_size);
1765
1766         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1767                 struct regid *eid;
1768                 struct deviceSpec *dsea =
1769                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1770                 if (!dsea) {
1771                         dsea = (struct deviceSpec *)
1772                                 udf_add_extendedattr(inode,
1773                                                      sizeof(struct deviceSpec) +
1774                                                      sizeof(struct regid), 12, 0x3);
1775                         dsea->attrType = cpu_to_le32(12);
1776                         dsea->attrSubtype = 1;
1777                         dsea->attrLength = cpu_to_le32(
1778                                                 sizeof(struct deviceSpec) +
1779                                                 sizeof(struct regid));
1780                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1781                 }
1782                 eid = (struct regid *)dsea->impUse;
1783                 memset(eid, 0, sizeof(*eid));
1784                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1785                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1786                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1787                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1788                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1789         }
1790
1791         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1792                 lb_recorded = 0; /* No extents => no blocks! */
1793         else
1794                 lb_recorded =
1795                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1796                         (blocksize_bits - 9);
1797
1798         if (iinfo->i_efe == 0) {
1799                 memcpy(bh->b_data + sizeof(struct fileEntry),
1800                        iinfo->i_data,
1801                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1802                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1803
1804                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1805                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1806                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1807                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1808                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1809                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1810                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1811                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1812                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1813                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1814                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1815                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1816                 crclen = sizeof(struct fileEntry);
1817         } else {
1818                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1819                        iinfo->i_data,
1820                        inode->i_sb->s_blocksize -
1821                                         sizeof(struct extendedFileEntry));
1822                 efe->objectSize =
1823                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1824                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1825
1826                 if (iinfo->i_streamdir) {
1827                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1828
1829                         icb_lad->extLocation =
1830                                 cpu_to_lelb(iinfo->i_locStreamdir);
1831                         icb_lad->extLength =
1832                                 cpu_to_le32(inode->i_sb->s_blocksize);
1833                 }
1834
1835                 udf_adjust_time(iinfo, inode->i_atime);
1836                 udf_adjust_time(iinfo, inode->i_mtime);
1837                 udf_adjust_time(iinfo, inode->i_ctime);
1838
1839                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1840                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1841                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1842                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1843
1844                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1845                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1846                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1847                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1848                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1849                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1850                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1851                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1852                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1853                 crclen = sizeof(struct extendedFileEntry);
1854         }
1855
1856 finish:
1857         if (iinfo->i_strat4096) {
1858                 fe->icbTag.strategyType = cpu_to_le16(4096);
1859                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1860                 fe->icbTag.numEntries = cpu_to_le16(2);
1861         } else {
1862                 fe->icbTag.strategyType = cpu_to_le16(4);
1863                 fe->icbTag.numEntries = cpu_to_le16(1);
1864         }
1865
1866         if (iinfo->i_use)
1867                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1868         else if (S_ISDIR(inode->i_mode))
1869                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1870         else if (S_ISREG(inode->i_mode))
1871                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1872         else if (S_ISLNK(inode->i_mode))
1873                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1874         else if (S_ISBLK(inode->i_mode))
1875                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1876         else if (S_ISCHR(inode->i_mode))
1877                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1878         else if (S_ISFIFO(inode->i_mode))
1879                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1880         else if (S_ISSOCK(inode->i_mode))
1881                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1882
1883         icbflags =      iinfo->i_alloc_type |
1884                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1885                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1886                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1887                         (le16_to_cpu(fe->icbTag.flags) &
1888                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1889                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1890
1891         fe->icbTag.flags = cpu_to_le16(icbflags);
1892         if (sbi->s_udfrev >= 0x0200)
1893                 fe->descTag.descVersion = cpu_to_le16(3);
1894         else
1895                 fe->descTag.descVersion = cpu_to_le16(2);
1896         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1897         fe->descTag.tagLocation = cpu_to_le32(
1898                                         iinfo->i_location.logicalBlockNum);
1899         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1900         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1901         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1902                                                   crclen));
1903         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1904
1905         set_buffer_uptodate(bh);
1906         unlock_buffer(bh);
1907
1908         /* write the data blocks */
1909         mark_buffer_dirty(bh);
1910         if (do_sync) {
1911                 sync_dirty_buffer(bh);
1912                 if (buffer_write_io_error(bh)) {
1913                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1914                                  inode->i_ino);
1915                         err = -EIO;
1916                 }
1917         }
1918         brelse(bh);
1919
1920         return err;
1921 }
1922
1923 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1924                          bool hidden_inode)
1925 {
1926         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1927         struct inode *inode = iget_locked(sb, block);
1928         int err;
1929
1930         if (!inode)
1931                 return ERR_PTR(-ENOMEM);
1932
1933         if (!(inode->i_state & I_NEW)) {
1934                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1935                         iput(inode);
1936                         return ERR_PTR(-EFSCORRUPTED);
1937                 }
1938                 return inode;
1939         }
1940
1941         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1942         err = udf_read_inode(inode, hidden_inode);
1943         if (err < 0) {
1944                 iget_failed(inode);
1945                 return ERR_PTR(err);
1946         }
1947         unlock_new_inode(inode);
1948
1949         return inode;
1950 }
1951
1952 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1953                             struct extent_position *epos)
1954 {
1955         struct super_block *sb = inode->i_sb;
1956         struct buffer_head *bh;
1957         struct allocExtDesc *aed;
1958         struct extent_position nepos;
1959         struct kernel_lb_addr neloc;
1960         int ver, adsize;
1961
1962         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1963                 adsize = sizeof(struct short_ad);
1964         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1965                 adsize = sizeof(struct long_ad);
1966         else
1967                 return -EIO;
1968
1969         neloc.logicalBlockNum = block;
1970         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1971
1972         bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1973         if (!bh)
1974                 return -EIO;
1975         lock_buffer(bh);
1976         memset(bh->b_data, 0x00, sb->s_blocksize);
1977         set_buffer_uptodate(bh);
1978         unlock_buffer(bh);
1979         mark_buffer_dirty_inode(bh, inode);
1980
1981         aed = (struct allocExtDesc *)(bh->b_data);
1982         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1983                 aed->previousAllocExtLocation =
1984                                 cpu_to_le32(epos->block.logicalBlockNum);
1985         }
1986         aed->lengthAllocDescs = cpu_to_le32(0);
1987         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1988                 ver = 3;
1989         else
1990                 ver = 2;
1991         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1992                     sizeof(struct tag));
1993
1994         nepos.block = neloc;
1995         nepos.offset = sizeof(struct allocExtDesc);
1996         nepos.bh = bh;
1997
1998         /*
1999          * Do we have to copy current last extent to make space for indirect
2000          * one?
2001          */
2002         if (epos->offset + adsize > sb->s_blocksize) {
2003                 struct kernel_lb_addr cp_loc;
2004                 uint32_t cp_len;
2005                 int cp_type;
2006
2007                 epos->offset -= adsize;
2008                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
2009                 cp_len |= ((uint32_t)cp_type) << 30;
2010
2011                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2012                 udf_write_aext(inode, epos, &nepos.block,
2013                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2014         } else {
2015                 __udf_add_aext(inode, epos, &nepos.block,
2016                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2017         }
2018
2019         brelse(epos->bh);
2020         *epos = nepos;
2021
2022         return 0;
2023 }
2024
2025 /*
2026  * Append extent at the given position - should be the first free one in inode
2027  * / indirect extent. This function assumes there is enough space in the inode
2028  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2029  */
2030 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2031                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2032 {
2033         struct udf_inode_info *iinfo = UDF_I(inode);
2034         struct allocExtDesc *aed;
2035         int adsize;
2036
2037         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2038                 adsize = sizeof(struct short_ad);
2039         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2040                 adsize = sizeof(struct long_ad);
2041         else
2042                 return -EIO;
2043
2044         if (!epos->bh) {
2045                 WARN_ON(iinfo->i_lenAlloc !=
2046                         epos->offset - udf_file_entry_alloc_offset(inode));
2047         } else {
2048                 aed = (struct allocExtDesc *)epos->bh->b_data;
2049                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2050                         epos->offset - sizeof(struct allocExtDesc));
2051                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2052         }
2053
2054         udf_write_aext(inode, epos, eloc, elen, inc);
2055
2056         if (!epos->bh) {
2057                 iinfo->i_lenAlloc += adsize;
2058                 mark_inode_dirty(inode);
2059         } else {
2060                 aed = (struct allocExtDesc *)epos->bh->b_data;
2061                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2062                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2063                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2064                         udf_update_tag(epos->bh->b_data,
2065                                         epos->offset + (inc ? 0 : adsize));
2066                 else
2067                         udf_update_tag(epos->bh->b_data,
2068                                         sizeof(struct allocExtDesc));
2069                 mark_buffer_dirty_inode(epos->bh, inode);
2070         }
2071
2072         return 0;
2073 }
2074
2075 /*
2076  * Append extent at given position - should be the first free one in inode
2077  * / indirect extent. Takes care of allocating and linking indirect blocks.
2078  */
2079 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2080                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2081 {
2082         int adsize;
2083         struct super_block *sb = inode->i_sb;
2084
2085         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2086                 adsize = sizeof(struct short_ad);
2087         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2088                 adsize = sizeof(struct long_ad);
2089         else
2090                 return -EIO;
2091
2092         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2093                 int err;
2094                 udf_pblk_t new_block;
2095
2096                 new_block = udf_new_block(sb, NULL,
2097                                           epos->block.partitionReferenceNum,
2098                                           epos->block.logicalBlockNum, &err);
2099                 if (!new_block)
2100                         return -ENOSPC;
2101
2102                 err = udf_setup_indirect_aext(inode, new_block, epos);
2103                 if (err)
2104                         return err;
2105         }
2106
2107         return __udf_add_aext(inode, epos, eloc, elen, inc);
2108 }
2109
2110 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2111                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2112 {
2113         int adsize;
2114         uint8_t *ptr;
2115         struct short_ad *sad;
2116         struct long_ad *lad;
2117         struct udf_inode_info *iinfo = UDF_I(inode);
2118
2119         if (!epos->bh)
2120                 ptr = iinfo->i_data + epos->offset -
2121                         udf_file_entry_alloc_offset(inode) +
2122                         iinfo->i_lenEAttr;
2123         else
2124                 ptr = epos->bh->b_data + epos->offset;
2125
2126         switch (iinfo->i_alloc_type) {
2127         case ICBTAG_FLAG_AD_SHORT:
2128                 sad = (struct short_ad *)ptr;
2129                 sad->extLength = cpu_to_le32(elen);
2130                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2131                 adsize = sizeof(struct short_ad);
2132                 break;
2133         case ICBTAG_FLAG_AD_LONG:
2134                 lad = (struct long_ad *)ptr;
2135                 lad->extLength = cpu_to_le32(elen);
2136                 lad->extLocation = cpu_to_lelb(*eloc);
2137                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2138                 adsize = sizeof(struct long_ad);
2139                 break;
2140         default:
2141                 return;
2142         }
2143
2144         if (epos->bh) {
2145                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2146                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2147                         struct allocExtDesc *aed =
2148                                 (struct allocExtDesc *)epos->bh->b_data;
2149                         udf_update_tag(epos->bh->b_data,
2150                                        le32_to_cpu(aed->lengthAllocDescs) +
2151                                        sizeof(struct allocExtDesc));
2152                 }
2153                 mark_buffer_dirty_inode(epos->bh, inode);
2154         } else {
2155                 mark_inode_dirty(inode);
2156         }
2157
2158         if (inc)
2159                 epos->offset += adsize;
2160 }
2161
2162 /*
2163  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2164  * someone does some weird stuff.
2165  */
2166 #define UDF_MAX_INDIR_EXTS 16
2167
2168 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2169                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2170 {
2171         int8_t etype;
2172         unsigned int indirections = 0;
2173
2174         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2175                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2176                 udf_pblk_t block;
2177
2178                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2179                         udf_err(inode->i_sb,
2180                                 "too many indirect extents in inode %lu\n",
2181                                 inode->i_ino);
2182                         return -1;
2183                 }
2184
2185                 epos->block = *eloc;
2186                 epos->offset = sizeof(struct allocExtDesc);
2187                 brelse(epos->bh);
2188                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2189                 epos->bh = sb_bread(inode->i_sb, block);
2190                 if (!epos->bh) {
2191                         udf_debug("reading block %u failed!\n", block);
2192                         return -1;
2193                 }
2194         }
2195
2196         return etype;
2197 }
2198
2199 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2200                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2201 {
2202         int alen;
2203         int8_t etype;
2204         uint8_t *ptr;
2205         struct short_ad *sad;
2206         struct long_ad *lad;
2207         struct udf_inode_info *iinfo = UDF_I(inode);
2208
2209         if (!epos->bh) {
2210                 if (!epos->offset)
2211                         epos->offset = udf_file_entry_alloc_offset(inode);
2212                 ptr = iinfo->i_data + epos->offset -
2213                         udf_file_entry_alloc_offset(inode) +
2214                         iinfo->i_lenEAttr;
2215                 alen = udf_file_entry_alloc_offset(inode) +
2216                                                         iinfo->i_lenAlloc;
2217         } else {
2218                 if (!epos->offset)
2219                         epos->offset = sizeof(struct allocExtDesc);
2220                 ptr = epos->bh->b_data + epos->offset;
2221                 alen = sizeof(struct allocExtDesc) +
2222                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2223                                                         lengthAllocDescs);
2224         }
2225
2226         switch (iinfo->i_alloc_type) {
2227         case ICBTAG_FLAG_AD_SHORT:
2228                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2229                 if (!sad)
2230                         return -1;
2231                 etype = le32_to_cpu(sad->extLength) >> 30;
2232                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2233                 eloc->partitionReferenceNum =
2234                                 iinfo->i_location.partitionReferenceNum;
2235                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2236                 break;
2237         case ICBTAG_FLAG_AD_LONG:
2238                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2239                 if (!lad)
2240                         return -1;
2241                 etype = le32_to_cpu(lad->extLength) >> 30;
2242                 *eloc = lelb_to_cpu(lad->extLocation);
2243                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2244                 break;
2245         default:
2246                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2247                 return -1;
2248         }
2249
2250         return etype;
2251 }
2252
2253 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2254                            struct kernel_lb_addr neloc, uint32_t nelen)
2255 {
2256         struct kernel_lb_addr oeloc;
2257         uint32_t oelen;
2258         int8_t etype;
2259         int err;
2260
2261         if (epos.bh)
2262                 get_bh(epos.bh);
2263
2264         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2265                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2266                 neloc = oeloc;
2267                 nelen = (etype << 30) | oelen;
2268         }
2269         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2270         brelse(epos.bh);
2271
2272         return err;
2273 }
2274
2275 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2276 {
2277         struct extent_position oepos;
2278         int adsize;
2279         int8_t etype;
2280         struct allocExtDesc *aed;
2281         struct udf_inode_info *iinfo;
2282         struct kernel_lb_addr eloc;
2283         uint32_t elen;
2284
2285         if (epos.bh) {
2286                 get_bh(epos.bh);
2287                 get_bh(epos.bh);
2288         }
2289
2290         iinfo = UDF_I(inode);
2291         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2292                 adsize = sizeof(struct short_ad);
2293         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2294                 adsize = sizeof(struct long_ad);
2295         else
2296                 adsize = 0;
2297
2298         oepos = epos;
2299         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2300                 return -1;
2301
2302         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2303                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2304                 if (oepos.bh != epos.bh) {
2305                         oepos.block = epos.block;
2306                         brelse(oepos.bh);
2307                         get_bh(epos.bh);
2308                         oepos.bh = epos.bh;
2309                         oepos.offset = epos.offset - adsize;
2310                 }
2311         }
2312         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2313         elen = 0;
2314
2315         if (epos.bh != oepos.bh) {
2316                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2317                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2318                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2319                 if (!oepos.bh) {
2320                         iinfo->i_lenAlloc -= (adsize * 2);
2321                         mark_inode_dirty(inode);
2322                 } else {
2323                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2324                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2325                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2326                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2327                                 udf_update_tag(oepos.bh->b_data,
2328                                                 oepos.offset - (2 * adsize));
2329                         else
2330                                 udf_update_tag(oepos.bh->b_data,
2331                                                 sizeof(struct allocExtDesc));
2332                         mark_buffer_dirty_inode(oepos.bh, inode);
2333                 }
2334         } else {
2335                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2336                 if (!oepos.bh) {
2337                         iinfo->i_lenAlloc -= adsize;
2338                         mark_inode_dirty(inode);
2339                 } else {
2340                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2341                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2342                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2343                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2344                                 udf_update_tag(oepos.bh->b_data,
2345                                                 epos.offset - adsize);
2346                         else
2347                                 udf_update_tag(oepos.bh->b_data,
2348                                                 sizeof(struct allocExtDesc));
2349                         mark_buffer_dirty_inode(oepos.bh, inode);
2350                 }
2351         }
2352
2353         brelse(epos.bh);
2354         brelse(oepos.bh);
2355
2356         return (elen >> 30);
2357 }
2358
2359 int8_t inode_bmap(struct inode *inode, sector_t block,
2360                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2361                   uint32_t *elen, sector_t *offset)
2362 {
2363         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2364         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2365         int8_t etype;
2366         struct udf_inode_info *iinfo;
2367
2368         iinfo = UDF_I(inode);
2369         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2370                 pos->offset = 0;
2371                 pos->block = iinfo->i_location;
2372                 pos->bh = NULL;
2373         }
2374         *elen = 0;
2375         do {
2376                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2377                 if (etype == -1) {
2378                         *offset = (bcount - lbcount) >> blocksize_bits;
2379                         iinfo->i_lenExtents = lbcount;
2380                         return -1;
2381                 }
2382                 lbcount += *elen;
2383         } while (lbcount <= bcount);
2384         /* update extent cache */
2385         udf_update_extent_cache(inode, lbcount - *elen, pos);
2386         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2387
2388         return etype;
2389 }