fs/udf/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * inode.c
   4  *
   5  * PURPOSE
   6  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   7  *
   8  * COPYRIGHT
   9  *  (C) 1998 Dave Boynton
  10  *  (C) 1998-2004 Ben Fennema
  11  *  (C) 1999-2000 Stelias Computing Inc
  12  *
  13  * HISTORY
  14  *
  15  *  10/04/98 dgb  Added rudimentary directory functions
  16  *  10/07/98      Fully working udf_block_map! It works!
  17  *  11/25/98      bmap altered to better support extents
  18  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  19  *                and udf_read_inode
  20  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  21  *                block boundaries (which is not actually allowed)
  22  *  12/20/98      added support for strategy 4096
  23  *  03/07/99      rewrote udf_block_map (again)
  24  *                New funcs, inode_bmap, udf_next_aext
  25  *  04/19/99      Support for writing device EA's for major/minor #
  26  */
  27
  28 #include "udfdecl.h"
  29 #include <linux/mm.h>
  30 #include <linux/module.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/writeback.h>
  33 #include <linux/slab.h>
  34 #include <linux/crc-itu-t.h>
  35 #include <linux/mpage.h>
  36 #include <linux/uio.h>
  37 #include <linux/bio.h>
  38
  39 #include "udf_i.h"
  40 #include "udf_sb.h"
  41
  42 #define EXTENT_MERGE_SIZE 5
  43
  44 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
  45                          FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
  46                          FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
  47
  48 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
  49                          FE_PERM_O_DELETE)
  50
  51 struct udf_map_rq;
  52
  53 static umode_t udf_convert_permissions(struct fileEntry *);
  54 static int udf_update_inode(struct inode *, int);
  55 static int udf_sync_inode(struct inode *inode);
  56 static int udf_alloc_i_data(struct inode *inode, size_t size);
  57 static int inode_getblk(struct inode *inode, struct udf_map_rq *map);
  58 static int udf_insert_aext(struct inode *, struct extent_position,
  59                            struct kernel_lb_addr, uint32_t);
  60 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
  61                               struct kernel_long_ad *, int *);
  62 static void udf_prealloc_extents(struct inode *, int, int,
  63                                  struct kernel_long_ad *, int *);
  64 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  65 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  66                               int, struct extent_position *);
  67 static int udf_get_block_wb(struct inode *inode, sector_t block,
  68                             struct buffer_head *bh_result, int create);
  69
  70 static void __udf_clear_extent_cache(struct inode *inode)
  71 {
  72         struct udf_inode_info *iinfo = UDF_I(inode);
  73
  74         if (iinfo->cached_extent.lstart != -1) {
  75                 brelse(iinfo->cached_extent.epos.bh);
  76                 iinfo->cached_extent.lstart = -1;
  77         }
  78 }
  79
  80 /* Invalidate extent cache */
  81 static void udf_clear_extent_cache(struct inode *inode)
  82 {
  83         struct udf_inode_info *iinfo = UDF_I(inode);
  84
  85         spin_lock(&iinfo->i_extent_cache_lock);
  86         __udf_clear_extent_cache(inode);
  87         spin_unlock(&iinfo->i_extent_cache_lock);
  88 }
  89
  90 /* Return contents of extent cache */
  91 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  92                                  loff_t *lbcount, struct extent_position *pos)
  93 {
  94         struct udf_inode_info *iinfo = UDF_I(inode);
  95         int ret = 0;
  96
  97         spin_lock(&iinfo->i_extent_cache_lock);
  98         if ((iinfo->cached_extent.lstart <= bcount) &&
  99             (iinfo->cached_extent.lstart != -1)) {
 100                 /* Cache hit */
 101                 *lbcount = iinfo->cached_extent.lstart;
 102                 memcpy(pos, &iinfo->cached_extent.epos,
 103                        sizeof(struct extent_position));
 104                 if (pos->bh)
 105                         get_bh(pos->bh);
 106                 ret = 1;
 107         }
 108         spin_unlock(&iinfo->i_extent_cache_lock);
 109         return ret;
 110 }
 111
 112 /* Add extent to extent cache */
 113 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 114                                     struct extent_position *pos)
 115 {
 116         struct udf_inode_info *iinfo = UDF_I(inode);
 117
 118         spin_lock(&iinfo->i_extent_cache_lock);
 119         /* Invalidate previously cached extent */
 120         __udf_clear_extent_cache(inode);
 121         if (pos->bh)
 122                 get_bh(pos->bh);
 123         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 124         iinfo->cached_extent.lstart = estart;
 125         switch (iinfo->i_alloc_type) {
 126         case ICBTAG_FLAG_AD_SHORT:
 127                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 128                 break;
 129         case ICBTAG_FLAG_AD_LONG:
 130                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 131                 break;
 132         }
 133         spin_unlock(&iinfo->i_extent_cache_lock);
 134 }
 135
 136 void udf_evict_inode(struct inode *inode)
 137 {
 138         struct udf_inode_info *iinfo = UDF_I(inode);
 139         int want_delete = 0;
 140
 141         if (!is_bad_inode(inode)) {
 142                 if (!inode->i_nlink) {
 143                         want_delete = 1;
 144                         udf_setsize(inode, 0);
 145                         udf_update_inode(inode, IS_SYNC(inode));
 146                 }
 147                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 148                     inode->i_size != iinfo->i_lenExtents) {
 149                         udf_warn(inode->i_sb,
 150                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 151                                  inode->i_ino, inode->i_mode,
 152                                  (unsigned long long)inode->i_size,
 153                                  (unsigned long long)iinfo->i_lenExtents);
 154                 }
 155         }
 156         truncate_inode_pages_final(&inode->i_data);
 157         invalidate_inode_buffers(inode);
 158         clear_inode(inode);
 159         kfree(iinfo->i_data);
 160         iinfo->i_data = NULL;
 161         udf_clear_extent_cache(inode);
 162         if (want_delete) {
 163                 udf_free_inode(inode);
 164         }
 165 }
 166
 167 static void udf_write_failed(struct address_space *mapping, loff_t to)
 168 {
 169         struct inode *inode = mapping->host;
 170         struct udf_inode_info *iinfo = UDF_I(inode);
 171         loff_t isize = inode->i_size;
 172
 173         if (to > isize) {
 174                 truncate_pagecache(inode, isize);
 175                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 176                         down_write(&iinfo->i_data_sem);
 177                         udf_clear_extent_cache(inode);
 178                         udf_truncate_extents(inode);
 179                         up_write(&iinfo->i_data_sem);
 180                 }
 181         }
 182 }
 183
 184 static int udf_adinicb_writepage(struct folio *folio,
 185                                  struct writeback_control *wbc, void *data)
 186 {
 187         struct inode *inode = folio->mapping->host;
 188         struct udf_inode_info *iinfo = UDF_I(inode);
 189
 190         BUG_ON(!folio_test_locked(folio));
 191         BUG_ON(folio->index != 0);
 192         memcpy_from_file_folio(iinfo->i_data + iinfo->i_lenEAttr, folio, 0,
 193                        i_size_read(inode));
 194         folio_unlock(folio);
 195         mark_inode_dirty(inode);
 196
 197         return 0;
 198 }
 199
 200 static int udf_writepages(struct address_space *mapping,
 201                           struct writeback_control *wbc)
 202 {
 203         struct inode *inode = mapping->host;
 204         struct udf_inode_info *iinfo = UDF_I(inode);
 205
 206         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 207                 return mpage_writepages(mapping, wbc, udf_get_block_wb);
 208         return write_cache_pages(mapping, wbc, udf_adinicb_writepage, NULL);
 209 }
 210
 211 static void udf_adinicb_read_folio(struct folio *folio)
 212 {
 213         struct inode *inode = folio->mapping->host;
 214         struct udf_inode_info *iinfo = UDF_I(inode);
 215         loff_t isize = i_size_read(inode);
 216
 217         folio_fill_tail(folio, 0, iinfo->i_data + iinfo->i_lenEAttr, isize);
 218         folio_mark_uptodate(folio);
 219 }
 220
 221 static int udf_read_folio(struct file *file, struct folio *folio)
 222 {
 223         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 224
 225         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 226                 udf_adinicb_read_folio(folio);
 227                 folio_unlock(folio);
 228                 return 0;
 229         }
 230         return mpage_read_folio(folio, udf_get_block);
 231 }
 232
 233 static void udf_readahead(struct readahead_control *rac)
 234 {
 235         struct udf_inode_info *iinfo = UDF_I(rac->mapping->host);
 236
 237         /*
 238          * No readahead needed for in-ICB files and udf_get_block() would get
 239          * confused for such file anyway.
 240          */
 241         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 242                 return;
 243
 244         mpage_readahead(rac, udf_get_block);
 245 }
 246
 247 static int udf_write_begin(struct file *file, struct address_space *mapping,
 248                            loff_t pos, unsigned len,
 249                            struct folio **foliop, void **fsdata)
 250 {
 251         struct udf_inode_info *iinfo = UDF_I(file_inode(file));
 252         struct folio *folio;
 253         int ret;
 254
 255         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 256                 ret = block_write_begin(mapping, pos, len, foliop,
 257                                         udf_get_block);
 258                 if (unlikely(ret))
 259                         udf_write_failed(mapping, pos + len);
 260                 return ret;
 261         }
 262         if (WARN_ON_ONCE(pos >= PAGE_SIZE))
 263                 return -EIO;
 264         folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
 265                         mapping_gfp_mask(mapping));
 266         if (IS_ERR(folio))
 267                 return PTR_ERR(folio);
 268         *foliop = folio;
 269         if (!folio_test_uptodate(folio))
 270                 udf_adinicb_read_folio(folio);
 271         return 0;
 272 }
 273
 274 static int udf_write_end(struct file *file, struct address_space *mapping,
 275                          loff_t pos, unsigned len, unsigned copied,
 276                          struct folio *folio, void *fsdata)
 277 {
 278         struct inode *inode = file_inode(file);
 279         loff_t last_pos;
 280
 281         if (UDF_I(inode)->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB)
 282                 return generic_write_end(file, mapping, pos, len, copied, folio,
 283                                          fsdata);
 284         last_pos = pos + copied;
 285         if (last_pos > inode->i_size)
 286                 i_size_write(inode, last_pos);
 287         folio_mark_dirty(folio);
 288         folio_unlock(folio);
 289         folio_put(folio);
 290
 291         return copied;
 292 }
 293
 294 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 295 {
 296         struct file *file = iocb->ki_filp;
 297         struct address_space *mapping = file->f_mapping;
 298         struct inode *inode = mapping->host;
 299         size_t count = iov_iter_count(iter);
 300         ssize_t ret;
 301
 302         /* Fallback to buffered IO for in-ICB files */
 303         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 304                 return 0;
 305         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 306         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 307                 udf_write_failed(mapping, iocb->ki_pos + count);
 308         return ret;
 309 }
 310
 311 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 312 {
 313         struct udf_inode_info *iinfo = UDF_I(mapping->host);
 314
 315         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 316                 return -EINVAL;
 317         return generic_block_bmap(mapping, block, udf_get_block);
 318 }
 319
 320 const struct address_space_operations udf_aops = {
 321         .dirty_folio    = block_dirty_folio,
 322         .invalidate_folio = block_invalidate_folio,
 323         .read_folio     = udf_read_folio,
 324         .readahead      = udf_readahead,
 325         .writepages     = udf_writepages,
 326         .write_begin    = udf_write_begin,
 327         .write_end      = udf_write_end,
 328         .direct_IO      = udf_direct_IO,
 329         .bmap           = udf_bmap,
 330         .migrate_folio  = buffer_migrate_folio,
 331 };
 332
 333 /*
 334  * Expand file stored in ICB to a normal one-block-file
 335  *
 336  * This function requires i_mutex held
 337  */
 338 int udf_expand_file_adinicb(struct inode *inode)
 339 {
 340         struct folio *folio;
 341         struct udf_inode_info *iinfo = UDF_I(inode);
 342         int err;
 343
 344         WARN_ON_ONCE(!inode_is_locked(inode));
 345         if (!iinfo->i_lenAlloc) {
 346                 down_write(&iinfo->i_data_sem);
 347                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 348                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 349                 else
 350                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 351                 up_write(&iinfo->i_data_sem);
 352                 mark_inode_dirty(inode);
 353                 return 0;
 354         }
 355
 356         folio = __filemap_get_folio(inode->i_mapping, 0,
 357                         FGP_LOCK | FGP_ACCESSED | FGP_CREAT, GFP_KERNEL);
 358         if (IS_ERR(folio))
 359                 return PTR_ERR(folio);
 360
 361         if (!folio_test_uptodate(folio))
 362                 udf_adinicb_read_folio(folio);
 363         down_write(&iinfo->i_data_sem);
 364         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 365                iinfo->i_lenAlloc);
 366         iinfo->i_lenAlloc = 0;
 367         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 368                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 369         else
 370                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 371         folio_mark_dirty(folio);
 372         folio_unlock(folio);
 373         up_write(&iinfo->i_data_sem);
 374         err = filemap_fdatawrite(inode->i_mapping);
 375         if (err) {
 376                 /* Restore everything back so that we don't lose data... */
 377                 folio_lock(folio);
 378                 down_write(&iinfo->i_data_sem);
 379                 memcpy_from_folio(iinfo->i_data + iinfo->i_lenEAttr,
 380                                 folio, 0, inode->i_size);
 381                 folio_unlock(folio);
 382                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 383                 iinfo->i_lenAlloc = inode->i_size;
 384                 up_write(&iinfo->i_data_sem);
 385         }
 386         folio_put(folio);
 387         mark_inode_dirty(inode);
 388
 389         return err;
 390 }
 391
 392 #define UDF_MAP_CREATE          0x01    /* Mapping can allocate new blocks */
 393 #define UDF_MAP_NOPREALLOC      0x02    /* Do not preallocate blocks */
 394
 395 #define UDF_BLK_MAPPED  0x01    /* Block was successfully mapped */
 396 #define UDF_BLK_NEW     0x02    /* Block was freshly allocated */
 397
 398 struct udf_map_rq {
 399         sector_t lblk;
 400         udf_pblk_t pblk;
 401         int iflags;             /* UDF_MAP_ flags determining behavior */
 402         int oflags;             /* UDF_BLK_ flags reporting results */
 403 };
 404
 405 static int udf_map_block(struct inode *inode, struct udf_map_rq *map)
 406 {
 407         int ret;
 408         struct udf_inode_info *iinfo = UDF_I(inode);
 409
 410         if (WARN_ON_ONCE(iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB))
 411                 return -EFSCORRUPTED;
 412
 413         map->oflags = 0;
 414         if (!(map->iflags & UDF_MAP_CREATE)) {
 415                 struct kernel_lb_addr eloc;
 416                 uint32_t elen;
 417                 sector_t offset;
 418                 struct extent_position epos = {};
 419                 int8_t etype;
 420
 421                 down_read(&iinfo->i_data_sem);
 422                 ret = inode_bmap(inode, map->lblk, &epos, &eloc, &elen, &offset,
 423                                  &etype);
 424                 if (ret < 0)
 425                         goto out_read;
 426                 if (ret > 0 && etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 427                         map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc,
 428                                                         offset);
 429                         map->oflags |= UDF_BLK_MAPPED;
 430                         ret = 0;
 431                 }
 432 out_read:
 433                 up_read(&iinfo->i_data_sem);
 434                 brelse(epos.bh);
 435
 436                 return ret;
 437         }
 438
 439         down_write(&iinfo->i_data_sem);
 440         /*
 441          * Block beyond EOF and prealloc extents? Just discard preallocation
 442          * as it is not useful and complicates things.
 443          */
 444         if (((loff_t)map->lblk) << inode->i_blkbits >= iinfo->i_lenExtents)
 445                 udf_discard_prealloc(inode);
 446         udf_clear_extent_cache(inode);
 447         ret = inode_getblk(inode, map);
 448         up_write(&iinfo->i_data_sem);
 449         return ret;
 450 }
 451
 452 static int __udf_get_block(struct inode *inode, sector_t block,
 453                            struct buffer_head *bh_result, int flags)
 454 {
 455         int err;
 456         struct udf_map_rq map = {
 457                 .lblk = block,
 458                 .iflags = flags,
 459         };
 460
 461         err = udf_map_block(inode, &map);
 462         if (err < 0)
 463                 return err;
 464         if (map.oflags & UDF_BLK_MAPPED) {
 465                 map_bh(bh_result, inode->i_sb, map.pblk);
 466                 if (map.oflags & UDF_BLK_NEW)
 467                         set_buffer_new(bh_result);
 468         }
 469         return 0;
 470 }
 471
 472 int udf_get_block(struct inode *inode, sector_t block,
 473                   struct buffer_head *bh_result, int create)
 474 {
 475         int flags = create ? UDF_MAP_CREATE : 0;
 476
 477         /*
 478          * We preallocate blocks only for regular files. It also makes sense
 479          * for directories but there's a problem when to drop the
 480          * preallocation. We might use some delayed work for that but I feel
 481          * it's overengineering for a filesystem like UDF.
 482          */
 483         if (!S_ISREG(inode->i_mode))
 484                 flags |= UDF_MAP_NOPREALLOC;
 485         return __udf_get_block(inode, block, bh_result, flags);
 486 }
 487
 488 /*
 489  * We shouldn't be allocating blocks on page writeback since we allocate them
 490  * on page fault. We can spot dirty buffers without allocated blocks though
 491  * when truncate expands file. These however don't have valid data so we can
 492  * safely ignore them. So never allocate blocks from page writeback.
 493  */
 494 static int udf_get_block_wb(struct inode *inode, sector_t block,
 495                             struct buffer_head *bh_result, int create)
 496 {
 497         return __udf_get_block(inode, block, bh_result, 0);
 498 }
 499
 500 /* Extend the file with new blocks totaling 'new_block_bytes',
 501  * return the number of extents added
 502  */
 503 static int udf_do_extend_file(struct inode *inode,
 504                               struct extent_position *last_pos,
 505                               struct kernel_long_ad *last_ext,
 506                               loff_t new_block_bytes)
 507 {
 508         uint32_t add;
 509         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 510         struct super_block *sb = inode->i_sb;
 511         struct udf_inode_info *iinfo;
 512         int err;
 513
 514         /* The previous extent is fake and we should not extend by anything
 515          * - there's nothing to do... */
 516         if (!new_block_bytes && fake)
 517                 return 0;
 518
 519         iinfo = UDF_I(inode);
 520         /* Round the last extent up to a multiple of block size */
 521         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 522                 last_ext->extLength =
 523                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 524                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 525                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 526                 iinfo->i_lenExtents =
 527                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 528                         ~(sb->s_blocksize - 1);
 529         }
 530
 531         add = 0;
 532         /* Can we merge with the previous extent? */
 533         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 534                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 535                 add = (1 << 30) - sb->s_blocksize -
 536                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 537                 if (add > new_block_bytes)
 538                         add = new_block_bytes;
 539                 new_block_bytes -= add;
 540                 last_ext->extLength += add;
 541         }
 542
 543         if (fake) {
 544                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 545                                    last_ext->extLength, 1);
 546                 if (err < 0)
 547                         goto out_err;
 548                 count++;
 549         } else {
 550                 struct kernel_lb_addr tmploc;
 551                 uint32_t tmplen;
 552                 int8_t tmptype;
 553
 554                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 555                                 last_ext->extLength, 1);
 556
 557                 /*
 558                  * We've rewritten the last extent. If we are going to add
 559                  * more extents, we may need to enter possible following
 560                  * empty indirect extent.
 561                  */
 562                 if (new_block_bytes) {
 563                         err = udf_next_aext(inode, last_pos, &tmploc, &tmplen,
 564                                             &tmptype, 0);
 565                         if (err < 0)
 566                                 goto out_err;
 567                 }
 568         }
 569         iinfo->i_lenExtents += add;
 570
 571         /* Managed to do everything necessary? */
 572         if (!new_block_bytes)
 573                 goto out;
 574
 575         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 576         last_ext->extLocation.logicalBlockNum = 0;
 577         last_ext->extLocation.partitionReferenceNum = 0;
 578         add = (1 << 30) - sb->s_blocksize;
 579         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 580
 581         /* Create enough extents to cover the whole hole */
 582         while (new_block_bytes > add) {
 583                 new_block_bytes -= add;
 584                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 585                                    last_ext->extLength, 1);
 586                 if (err)
 587                         goto out_err;
 588                 iinfo->i_lenExtents += add;
 589                 count++;
 590         }
 591         if (new_block_bytes) {
 592                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 593                         new_block_bytes;
 594                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 595                                    last_ext->extLength, 1);
 596                 if (err)
 597                         goto out_err;
 598                 iinfo->i_lenExtents += new_block_bytes;
 599                 count++;
 600         }
 601
 602 out:
 603         /* last_pos should point to the last written extent... */
 604         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 605                 last_pos->offset -= sizeof(struct short_ad);
 606         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 607                 last_pos->offset -= sizeof(struct long_ad);
 608         else
 609                 return -EIO;
 610
 611         return count;
 612 out_err:
 613         /* Remove extents we've created so far */
 614         udf_clear_extent_cache(inode);
 615         udf_truncate_extents(inode);
 616         return err;
 617 }
 618
 619 /* Extend the final block of the file to final_block_len bytes */
 620 static void udf_do_extend_final_block(struct inode *inode,
 621                                       struct extent_position *last_pos,
 622                                       struct kernel_long_ad *last_ext,
 623                                       uint32_t new_elen)
 624 {
 625         uint32_t added_bytes;
 626
 627         /*
 628          * Extent already large enough? It may be already rounded up to block
 629          * size...
 630          */
 631         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 632                 return;
 633         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 634         last_ext->extLength += added_bytes;
 635         UDF_I(inode)->i_lenExtents += added_bytes;
 636
 637         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 638                         last_ext->extLength, 1);
 639 }
 640
 641 static int udf_extend_file(struct inode *inode, loff_t newsize)
 642 {
 643
 644         struct extent_position epos;
 645         struct kernel_lb_addr eloc;
 646         uint32_t elen;
 647         int8_t etype;
 648         struct super_block *sb = inode->i_sb;
 649         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 650         loff_t new_elen;
 651         int adsize;
 652         struct udf_inode_info *iinfo = UDF_I(inode);
 653         struct kernel_long_ad extent;
 654         int err = 0;
 655         bool within_last_ext;
 656
 657         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 658                 adsize = sizeof(struct short_ad);
 659         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 660                 adsize = sizeof(struct long_ad);
 661         else
 662                 BUG();
 663
 664         down_write(&iinfo->i_data_sem);
 665         /*
 666          * When creating hole in file, just don't bother with preserving
 667          * preallocation. It likely won't be very useful anyway.
 668          */
 669         udf_discard_prealloc(inode);
 670
 671         err = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset, &etype);
 672         if (err < 0)
 673                 goto out;
 674         within_last_ext = (err == 1);
 675         /* We don't expect extents past EOF... */
 676         WARN_ON_ONCE(within_last_ext &&
 677                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 678
 679         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 680             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 681                 /* File has no extents at all or has empty last
 682                  * indirect extent! Create a fake extent... */
 683                 extent.extLocation.logicalBlockNum = 0;
 684                 extent.extLocation.partitionReferenceNum = 0;
 685                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 686         } else {
 687                 epos.offset -= adsize;
 688                 err = udf_next_aext(inode, &epos, &extent.extLocation,
 689                                     &extent.extLength, &etype, 0);
 690                 if (err <= 0)
 691                         goto out;
 692                 extent.extLength |= etype << 30;
 693         }
 694
 695         new_elen = ((loff_t)offset << inode->i_blkbits) |
 696                                         (newsize & (sb->s_blocksize - 1));
 697
 698         /* File has extent covering the new size (could happen when extending
 699          * inside a block)?
 700          */
 701         if (within_last_ext) {
 702                 /* Extending file within the last file block */
 703                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 704         } else {
 705                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 706         }
 707
 708         if (err < 0)
 709                 goto out;
 710         err = 0;
 711 out:
 712         brelse(epos.bh);
 713         up_write(&iinfo->i_data_sem);
 714         return err;
 715 }
 716
 717 static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
 718 {
 719         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 720         struct extent_position prev_epos, cur_epos, next_epos;
 721         int count = 0, startnum = 0, endnum = 0;
 722         uint32_t elen = 0, tmpelen;
 723         struct kernel_lb_addr eloc, tmpeloc;
 724         int c = 1;
 725         loff_t lbcount = 0, b_off = 0;
 726         udf_pblk_t newblocknum;
 727         sector_t offset = 0;
 728         int8_t etype, tmpetype;
 729         struct udf_inode_info *iinfo = UDF_I(inode);
 730         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 731         int lastblock = 0;
 732         bool isBeyondEOF = false;
 733         int ret = 0;
 734
 735         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 736         prev_epos.block = iinfo->i_location;
 737         prev_epos.bh = NULL;
 738         cur_epos = next_epos = prev_epos;
 739         b_off = (loff_t)map->lblk << inode->i_sb->s_blocksize_bits;
 740
 741         /* find the extent which contains the block we are looking for.
 742            alternate between laarr[0] and laarr[1] for locations of the
 743            current extent, and the previous extent */
 744         do {
 745                 if (prev_epos.bh != cur_epos.bh) {
 746                         brelse(prev_epos.bh);
 747                         get_bh(cur_epos.bh);
 748                         prev_epos.bh = cur_epos.bh;
 749                 }
 750                 if (cur_epos.bh != next_epos.bh) {
 751                         brelse(cur_epos.bh);
 752                         get_bh(next_epos.bh);
 753                         cur_epos.bh = next_epos.bh;
 754                 }
 755
 756                 lbcount += elen;
 757
 758                 prev_epos.block = cur_epos.block;
 759                 cur_epos.block = next_epos.block;
 760
 761                 prev_epos.offset = cur_epos.offset;
 762                 cur_epos.offset = next_epos.offset;
 763
 764                 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 1);
 765                 if (ret < 0) {
 766                         goto out_free;
 767                 } else if (ret == 0) {
 768                         isBeyondEOF = true;
 769                         break;
 770                 }
 771
 772                 c = !c;
 773
 774                 laarr[c].extLength = (etype << 30) | elen;
 775                 laarr[c].extLocation = eloc;
 776
 777                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 778                         pgoal = eloc.logicalBlockNum +
 779                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 780                                  inode->i_sb->s_blocksize_bits);
 781
 782                 count++;
 783         } while (lbcount + elen <= b_off);
 784
 785         b_off -= lbcount;
 786         offset = b_off >> inode->i_sb->s_blocksize_bits;
 787         /*
 788          * Move prev_epos and cur_epos into indirect extent if we are at
 789          * the pointer to it
 790          */
 791         ret = udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
 792         if (ret < 0)
 793                 goto out_free;
 794         ret = udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
 795         if (ret < 0)
 796                 goto out_free;
 797
 798         /* if the extent is allocated and recorded, return the block
 799            if the extent is not a multiple of the blocksize, round up */
 800
 801         if (!isBeyondEOF && etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 802                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 803                         elen = EXT_RECORDED_ALLOCATED |
 804                                 ((elen + inode->i_sb->s_blocksize - 1) &
 805                                  ~(inode->i_sb->s_blocksize - 1));
 806                         iinfo->i_lenExtents =
 807                                 ALIGN(iinfo->i_lenExtents,
 808                                       inode->i_sb->s_blocksize);
 809                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 810                 }
 811                 map->oflags = UDF_BLK_MAPPED;
 812                 map->pblk = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 813                 goto out_free;
 814         }
 815
 816         /* Are we beyond EOF and preallocated extent? */
 817         if (isBeyondEOF) {
 818                 loff_t hole_len;
 819
 820                 if (count) {
 821                         if (c)
 822                                 laarr[0] = laarr[1];
 823                         startnum = 1;
 824                 } else {
 825                         /* Create a fake extent when there's not one */
 826                         memset(&laarr[0].extLocation, 0x00,
 827                                 sizeof(struct kernel_lb_addr));
 828                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 829                         /* Will udf_do_extend_file() create real extent from
 830                            a fake one? */
 831                         startnum = (offset > 0);
 832                 }
 833                 /* Create extents for the hole between EOF and offset */
 834                 hole_len = (loff_t)offset << inode->i_blkbits;
 835                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 836                 if (ret < 0)
 837                         goto out_free;
 838                 c = 0;
 839                 offset = 0;
 840                 count += ret;
 841                 /*
 842                  * Is there any real extent? - otherwise we overwrite the fake
 843                  * one...
 844                  */
 845                 if (count)
 846                         c = !c;
 847                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 848                         inode->i_sb->s_blocksize;
 849                 memset(&laarr[c].extLocation, 0x00,
 850                         sizeof(struct kernel_lb_addr));
 851                 count++;
 852                 endnum = c + 1;
 853                 lastblock = 1;
 854         } else {
 855                 endnum = startnum = ((count > 2) ? 2 : count);
 856
 857                 /* if the current extent is in position 0,
 858                    swap it with the previous */
 859                 if (!c && count != 1) {
 860                         laarr[2] = laarr[0];
 861                         laarr[0] = laarr[1];
 862                         laarr[1] = laarr[2];
 863                         c = 1;
 864                 }
 865
 866                 /* if the current block is located in an extent,
 867                    read the next extent */
 868                 ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 0);
 869                 if (ret > 0) {
 870                         laarr[c + 1].extLength = (etype << 30) | elen;
 871                         laarr[c + 1].extLocation = eloc;
 872                         count++;
 873                         startnum++;
 874                         endnum++;
 875                 } else if (ret == 0)
 876                         lastblock = 1;
 877                 else
 878                         goto out_free;
 879         }
 880
 881         /* if the current extent is not recorded but allocated, get the
 882          * block in the extent corresponding to the requested block */
 883         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 884                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 885         else { /* otherwise, allocate a new block */
 886                 if (iinfo->i_next_alloc_block == map->lblk)
 887                         goal = iinfo->i_next_alloc_goal;
 888
 889                 if (!goal) {
 890                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 891                                 goal = iinfo->i_location.logicalBlockNum + 1;
 892                 }
 893
 894                 newblocknum = udf_new_block(inode->i_sb, inode,
 895                                 iinfo->i_location.partitionReferenceNum,
 896                                 goal, &ret);
 897                 if (!newblocknum)
 898                         goto out_free;
 899                 if (isBeyondEOF)
 900                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 901         }
 902
 903         /* if the extent the requsted block is located in contains multiple
 904          * blocks, split the extent into at most three extents. blocks prior
 905          * to requested block, requested block, and blocks after requested
 906          * block */
 907         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 908
 909         if (!(map->iflags & UDF_MAP_NOPREALLOC))
 910                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 911
 912         /* merge any continuous blocks in laarr */
 913         udf_merge_extents(inode, laarr, &endnum);
 914
 915         /* write back the new extents, inserting new extents if the new number
 916          * of extents is greater than the old number, and deleting extents if
 917          * the new number of extents is less than the old number */
 918         ret = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 919         if (ret < 0)
 920                 goto out_free;
 921
 922         map->pblk = udf_get_pblock(inode->i_sb, newblocknum,
 923                                 iinfo->i_location.partitionReferenceNum, 0);
 924         if (!map->pblk) {
 925                 ret = -EFSCORRUPTED;
 926                 goto out_free;
 927         }
 928         map->oflags = UDF_BLK_NEW | UDF_BLK_MAPPED;
 929         iinfo->i_next_alloc_block = map->lblk + 1;
 930         iinfo->i_next_alloc_goal = newblocknum + 1;
 931         inode_set_ctime_current(inode);
 932
 933         if (IS_SYNC(inode))
 934                 udf_sync_inode(inode);
 935         else
 936                 mark_inode_dirty(inode);
 937         ret = 0;
 938 out_free:
 939         brelse(prev_epos.bh);
 940         brelse(cur_epos.bh);
 941         brelse(next_epos.bh);
 942         return ret;
 943 }
 944
 945 static void udf_split_extents(struct inode *inode, int *c, int offset,
 946                                udf_pblk_t newblocknum,
 947                                struct kernel_long_ad *laarr, int *endnum)
 948 {
 949         unsigned long blocksize = inode->i_sb->s_blocksize;
 950         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 951
 952         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 953             (laarr[*c].extLength >> 30) ==
 954                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 955                 int curr = *c;
 956                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 957                             blocksize - 1) >> blocksize_bits;
 958                 int8_t etype = (laarr[curr].extLength >> 30);
 959
 960                 if (blen == 1)
 961                         ;
 962                 else if (!offset || blen == offset + 1) {
 963                         laarr[curr + 2] = laarr[curr + 1];
 964                         laarr[curr + 1] = laarr[curr];
 965                 } else {
 966                         laarr[curr + 3] = laarr[curr + 1];
 967                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 968                 }
 969
 970                 if (offset) {
 971                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 972                                 udf_free_blocks(inode->i_sb, inode,
 973                                                 &laarr[curr].extLocation,
 974                                                 0, offset);
 975                                 laarr[curr].extLength =
 976                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 977                                         (offset << blocksize_bits);
 978                                 laarr[curr].extLocation.logicalBlockNum = 0;
 979                                 laarr[curr].extLocation.
 980                                                 partitionReferenceNum = 0;
 981                         } else
 982                                 laarr[curr].extLength = (etype << 30) |
 983                                         (offset << blocksize_bits);
 984                         curr++;
 985                         (*c)++;
 986                         (*endnum)++;
 987                 }
 988
 989                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 990                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 991                         laarr[curr].extLocation.partitionReferenceNum =
 992                                 UDF_I(inode)->i_location.partitionReferenceNum;
 993                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 994                         blocksize;
 995                 curr++;
 996
 997                 if (blen != offset + 1) {
 998                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 999                                 laarr[curr].extLocation.logicalBlockNum +=
1000                                                                 offset + 1;
1001                         laarr[curr].extLength = (etype << 30) |
1002                                 ((blen - (offset + 1)) << blocksize_bits);
1003                         curr++;
1004                         (*endnum)++;
1005                 }
1006         }
1007 }
1008
1009 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
1010                                  struct kernel_long_ad *laarr,
1011                                  int *endnum)
1012 {
1013         int start, length = 0, currlength = 0, i;
1014
1015         if (*endnum >= (c + 1)) {
1016                 if (!lastblock)
1017                         return;
1018                 else
1019                         start = c;
1020         } else {
1021                 if ((laarr[c + 1].extLength >> 30) ==
1022                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1023                         start = c + 1;
1024                         length = currlength =
1025                                 (((laarr[c + 1].extLength &
1026                                         UDF_EXTENT_LENGTH_MASK) +
1027                                 inode->i_sb->s_blocksize - 1) >>
1028                                 inode->i_sb->s_blocksize_bits);
1029                 } else
1030                         start = c;
1031         }
1032
1033         for (i = start + 1; i <= *endnum; i++) {
1034                 if (i == *endnum) {
1035                         if (lastblock)
1036                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1037                 } else if ((laarr[i].extLength >> 30) ==
1038                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1039                         length += (((laarr[i].extLength &
1040                                                 UDF_EXTENT_LENGTH_MASK) +
1041                                     inode->i_sb->s_blocksize - 1) >>
1042                                     inode->i_sb->s_blocksize_bits);
1043                 } else
1044                         break;
1045         }
1046
1047         if (length) {
1048                 int next = laarr[start].extLocation.logicalBlockNum +
1049                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1050                           inode->i_sb->s_blocksize - 1) >>
1051                           inode->i_sb->s_blocksize_bits);
1052                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1053                                 laarr[start].extLocation.partitionReferenceNum,
1054                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1055                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1056                                 currlength);
1057                 if (numalloc)   {
1058                         if (start == (c + 1))
1059                                 laarr[start].extLength +=
1060                                         (numalloc <<
1061                                          inode->i_sb->s_blocksize_bits);
1062                         else {
1063                                 memmove(&laarr[c + 2], &laarr[c + 1],
1064                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1065                                 (*endnum)++;
1066                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1067                                 laarr[c + 1].extLocation.partitionReferenceNum =
1068                                         laarr[c].extLocation.
1069                                                         partitionReferenceNum;
1070                                 laarr[c + 1].extLength =
1071                                         EXT_NOT_RECORDED_ALLOCATED |
1072                                         (numalloc <<
1073                                          inode->i_sb->s_blocksize_bits);
1074                                 start = c + 1;
1075                         }
1076
1077                         for (i = start + 1; numalloc && i < *endnum; i++) {
1078                                 int elen = ((laarr[i].extLength &
1079                                                 UDF_EXTENT_LENGTH_MASK) +
1080                                             inode->i_sb->s_blocksize - 1) >>
1081                                             inode->i_sb->s_blocksize_bits;
1082
1083                                 if (elen > numalloc) {
1084                                         laarr[i].extLength -=
1085                                                 (numalloc <<
1086                                                  inode->i_sb->s_blocksize_bits);
1087                                         numalloc = 0;
1088                                 } else {
1089                                         numalloc -= elen;
1090                                         if (*endnum > (i + 1))
1091                                                 memmove(&laarr[i],
1092                                                         &laarr[i + 1],
1093                                                         sizeof(struct long_ad) *
1094                                                         (*endnum - (i + 1)));
1095                                         i--;
1096                                         (*endnum)--;
1097                                 }
1098                         }
1099                         UDF_I(inode)->i_lenExtents +=
1100                                 numalloc << inode->i_sb->s_blocksize_bits;
1101                 }
1102         }
1103 }
1104
1105 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1106                               int *endnum)
1107 {
1108         int i;
1109         unsigned long blocksize = inode->i_sb->s_blocksize;
1110         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1111
1112         for (i = 0; i < (*endnum - 1); i++) {
1113                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1114                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1115
1116                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1117                         (((li->extLength >> 30) ==
1118                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1119                         ((lip1->extLocation.logicalBlockNum -
1120                           li->extLocation.logicalBlockNum) ==
1121                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1122                         blocksize - 1) >> blocksize_bits)))) {
1123
1124                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1125                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1126                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1127                                 li->extLength = lip1->extLength +
1128                                         (((li->extLength &
1129                                                 UDF_EXTENT_LENGTH_MASK) +
1130                                          blocksize - 1) & ~(blocksize - 1));
1131                                 if (*endnum > (i + 2))
1132                                         memmove(&laarr[i + 1], &laarr[i + 2],
1133                                                 sizeof(struct long_ad) *
1134                                                 (*endnum - (i + 2)));
1135                                 i--;
1136                                 (*endnum)--;
1137                         }
1138                 } else if (((li->extLength >> 30) ==
1139                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1140                            ((lip1->extLength >> 30) ==
1141                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1142                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1143                                         ((li->extLength &
1144                                           UDF_EXTENT_LENGTH_MASK) +
1145                                          blocksize - 1) >> blocksize_bits);
1146                         li->extLocation.logicalBlockNum = 0;
1147                         li->extLocation.partitionReferenceNum = 0;
1148
1149                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1150                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1151                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1152                                 lip1->extLength = (lip1->extLength -
1153                                                    (li->extLength &
1154                                                    UDF_EXTENT_LENGTH_MASK) +
1155                                                    UDF_EXTENT_LENGTH_MASK) &
1156                                                    ~(blocksize - 1);
1157                                 li->extLength = (li->extLength &
1158                                                  UDF_EXTENT_FLAG_MASK) +
1159                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1160                                                 blocksize;
1161                         } else {
1162                                 li->extLength = lip1->extLength +
1163                                         (((li->extLength &
1164                                                 UDF_EXTENT_LENGTH_MASK) +
1165                                           blocksize - 1) & ~(blocksize - 1));
1166                                 if (*endnum > (i + 2))
1167                                         memmove(&laarr[i + 1], &laarr[i + 2],
1168                                                 sizeof(struct long_ad) *
1169                                                 (*endnum - (i + 2)));
1170                                 i--;
1171                                 (*endnum)--;
1172                         }
1173                 } else if ((li->extLength >> 30) ==
1174                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1175                         udf_free_blocks(inode->i_sb, inode,
1176                                         &li->extLocation, 0,
1177                                         ((li->extLength &
1178                                                 UDF_EXTENT_LENGTH_MASK) +
1179                                          blocksize - 1) >> blocksize_bits);
1180                         li->extLocation.logicalBlockNum = 0;
1181                         li->extLocation.partitionReferenceNum = 0;
1182                         li->extLength = (li->extLength &
1183                                                 UDF_EXTENT_LENGTH_MASK) |
1184                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1185                 }
1186         }
1187 }
1188
1189 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1190                               int startnum, int endnum,
1191                               struct extent_position *epos)
1192 {
1193         int start = 0, i;
1194         struct kernel_lb_addr tmploc;
1195         uint32_t tmplen;
1196         int8_t tmpetype;
1197         int err;
1198
1199         if (startnum > endnum) {
1200                 for (i = 0; i < (startnum - endnum); i++)
1201                         udf_delete_aext(inode, *epos);
1202         } else if (startnum < endnum) {
1203                 for (i = 0; i < (endnum - startnum); i++) {
1204                         err = udf_insert_aext(inode, *epos,
1205                                               laarr[i].extLocation,
1206                                               laarr[i].extLength);
1207                         /*
1208                          * If we fail here, we are likely corrupting the extent
1209                          * list and leaking blocks. At least stop early to
1210                          * limit the damage.
1211                          */
1212                         if (err < 0)
1213                                 return err;
1214                         err = udf_next_aext(inode, epos, &laarr[i].extLocation,
1215                                       &laarr[i].extLength, &tmpetype, 1);
1216                         if (err < 0)
1217                                 return err;
1218                         start++;
1219                 }
1220         }
1221
1222         for (i = start; i < endnum; i++) {
1223                 err = udf_next_aext(inode, epos, &tmploc, &tmplen, &tmpetype, 0);
1224                 if (err < 0)
1225                         return err;
1226
1227                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1228                                laarr[i].extLength, 1);
1229         }
1230         return 0;
1231 }
1232
1233 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1234                               int create, int *err)
1235 {
1236         struct buffer_head *bh = NULL;
1237         struct udf_map_rq map = {
1238                 .lblk = block,
1239                 .iflags = UDF_MAP_NOPREALLOC | (create ? UDF_MAP_CREATE : 0),
1240         };
1241
1242         *err = udf_map_block(inode, &map);
1243         if (*err || !(map.oflags & UDF_BLK_MAPPED))
1244                 return NULL;
1245
1246         bh = sb_getblk(inode->i_sb, map.pblk);
1247         if (!bh) {
1248                 *err = -ENOMEM;
1249                 return NULL;
1250         }
1251         if (map.oflags & UDF_BLK_NEW) {
1252                 lock_buffer(bh);
1253                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
1254                 set_buffer_uptodate(bh);
1255                 unlock_buffer(bh);
1256                 mark_buffer_dirty_inode(bh, inode);
1257                 return bh;
1258         }
1259
1260         if (bh_read(bh, 0) >= 0)
1261                 return bh;
1262
1263         brelse(bh);
1264         *err = -EIO;
1265         return NULL;
1266 }
1267
1268 int udf_setsize(struct inode *inode, loff_t newsize)
1269 {
1270         int err = 0;
1271         struct udf_inode_info *iinfo;
1272         unsigned int bsize = i_blocksize(inode);
1273
1274         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1275               S_ISLNK(inode->i_mode)))
1276                 return -EINVAL;
1277
1278         iinfo = UDF_I(inode);
1279         if (newsize > inode->i_size) {
1280                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1281                         if (bsize >=
1282                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1283                                 down_write(&iinfo->i_data_sem);
1284                                 iinfo->i_lenAlloc = newsize;
1285                                 up_write(&iinfo->i_data_sem);
1286                                 goto set_size;
1287                         }
1288                         err = udf_expand_file_adinicb(inode);
1289                         if (err)
1290                                 return err;
1291                 }
1292                 err = udf_extend_file(inode, newsize);
1293                 if (err)
1294                         return err;
1295 set_size:
1296                 truncate_setsize(inode, newsize);
1297         } else {
1298                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1299                         down_write(&iinfo->i_data_sem);
1300                         udf_clear_extent_cache(inode);
1301                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1302                                0x00, bsize - newsize -
1303                                udf_file_entry_alloc_offset(inode));
1304                         iinfo->i_lenAlloc = newsize;
1305                         truncate_setsize(inode, newsize);
1306                         up_write(&iinfo->i_data_sem);
1307                         goto update_time;
1308                 }
1309                 err = block_truncate_page(inode->i_mapping, newsize,
1310                                           udf_get_block);
1311                 if (err)
1312                         return err;
1313                 truncate_setsize(inode, newsize);
1314                 down_write(&iinfo->i_data_sem);
1315                 udf_clear_extent_cache(inode);
1316                 err = udf_truncate_extents(inode);
1317                 up_write(&iinfo->i_data_sem);
1318                 if (err)
1319                         return err;
1320         }
1321 update_time:
1322         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1323         if (IS_SYNC(inode))
1324                 udf_sync_inode(inode);
1325         else
1326                 mark_inode_dirty(inode);
1327         return err;
1328 }
1329
1330 /*
1331  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1332  * arbitrary - just that we hopefully don't limit any real use of rewritten
1333  * inode on write-once media but avoid looping for too long on corrupted media.
1334  */
1335 #define UDF_MAX_ICB_NESTING 1024
1336
1337 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1338 {
1339         struct buffer_head *bh = NULL;
1340         struct fileEntry *fe;
1341         struct extendedFileEntry *efe;
1342         uint16_t ident;
1343         struct udf_inode_info *iinfo = UDF_I(inode);
1344         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1345         struct kernel_lb_addr *iloc = &iinfo->i_location;
1346         unsigned int link_count;
1347         unsigned int indirections = 0;
1348         int bs = inode->i_sb->s_blocksize;
1349         int ret = -EIO;
1350         uint32_t uid, gid;
1351         struct timespec64 ts;
1352
1353 reread:
1354         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1355                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1356                           iloc->partitionReferenceNum, sbi->s_partitions);
1357                 return -EIO;
1358         }
1359
1360         if (iloc->logicalBlockNum >=
1361             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1362                 udf_debug("block=%u, partition=%u out of range\n",
1363                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1364                 return -EIO;
1365         }
1366
1367         /*
1368          * Set defaults, but the inode is still incomplete!
1369          * Note: get_new_inode() sets the following on a new inode:
1370          *      i_sb = sb
1371          *      i_no = ino
1372          *      i_flags = sb->s_flags
1373          *      i_state = 0
1374          * clean_inode(): zero fills and sets
1375          *      i_count = 1
1376          *      i_nlink = 1
1377          *      i_op = NULL;
1378          */
1379         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1380         if (!bh) {
1381                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1382                 return -EIO;
1383         }
1384
1385         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1386             ident != TAG_IDENT_USE) {
1387                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1388                         inode->i_ino, ident);
1389                 goto out;
1390         }
1391
1392         fe = (struct fileEntry *)bh->b_data;
1393         efe = (struct extendedFileEntry *)bh->b_data;
1394
1395         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1396                 struct buffer_head *ibh;
1397
1398                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1399                 if (ident == TAG_IDENT_IE && ibh) {
1400                         struct kernel_lb_addr loc;
1401                         struct indirectEntry *ie;
1402
1403                         ie = (struct indirectEntry *)ibh->b_data;
1404                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1405
1406                         if (ie->indirectICB.extLength) {
1407                                 brelse(ibh);
1408                                 memcpy(&iinfo->i_location, &loc,
1409                                        sizeof(struct kernel_lb_addr));
1410                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1411                                         udf_err(inode->i_sb,
1412                                                 "too many ICBs in ICB hierarchy"
1413                                                 " (max %d supported)\n",
1414                                                 UDF_MAX_ICB_NESTING);
1415                                         goto out;
1416                                 }
1417                                 brelse(bh);
1418                                 goto reread;
1419                         }
1420                 }
1421                 brelse(ibh);
1422         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1423                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1424                         le16_to_cpu(fe->icbTag.strategyType));
1425                 goto out;
1426         }
1427         if (fe->icbTag.strategyType == cpu_to_le16(4))
1428                 iinfo->i_strat4096 = 0;
1429         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1430                 iinfo->i_strat4096 = 1;
1431
1432         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1433                                                         ICBTAG_FLAG_AD_MASK;
1434         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1435             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1436             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1437                 ret = -EIO;
1438                 goto out;
1439         }
1440         iinfo->i_hidden = hidden_inode;
1441         iinfo->i_unique = 0;
1442         iinfo->i_lenEAttr = 0;
1443         iinfo->i_lenExtents = 0;
1444         iinfo->i_lenAlloc = 0;
1445         iinfo->i_next_alloc_block = 0;
1446         iinfo->i_next_alloc_goal = 0;
1447         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1448                 iinfo->i_efe = 1;
1449                 iinfo->i_use = 0;
1450                 ret = udf_alloc_i_data(inode, bs -
1451                                         sizeof(struct extendedFileEntry));
1452                 if (ret)
1453                         goto out;
1454                 memcpy(iinfo->i_data,
1455                        bh->b_data + sizeof(struct extendedFileEntry),
1456                        bs - sizeof(struct extendedFileEntry));
1457         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1458                 iinfo->i_efe = 0;
1459                 iinfo->i_use = 0;
1460                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1461                 if (ret)
1462                         goto out;
1463                 memcpy(iinfo->i_data,
1464                        bh->b_data + sizeof(struct fileEntry),
1465                        bs - sizeof(struct fileEntry));
1466         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1467                 iinfo->i_efe = 0;
1468                 iinfo->i_use = 1;
1469                 iinfo->i_lenAlloc = le32_to_cpu(
1470                                 ((struct unallocSpaceEntry *)bh->b_data)->
1471                                  lengthAllocDescs);
1472                 ret = udf_alloc_i_data(inode, bs -
1473                                         sizeof(struct unallocSpaceEntry));
1474                 if (ret)
1475                         goto out;
1476                 memcpy(iinfo->i_data,
1477                        bh->b_data + sizeof(struct unallocSpaceEntry),
1478                        bs - sizeof(struct unallocSpaceEntry));
1479                 return 0;
1480         }
1481
1482         ret = -EIO;
1483         read_lock(&sbi->s_cred_lock);
1484         uid = le32_to_cpu(fe->uid);
1485         if (uid == UDF_INVALID_ID ||
1486             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1487                 inode->i_uid = sbi->s_uid;
1488         else
1489                 i_uid_write(inode, uid);
1490
1491         gid = le32_to_cpu(fe->gid);
1492         if (gid == UDF_INVALID_ID ||
1493             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1494                 inode->i_gid = sbi->s_gid;
1495         else
1496                 i_gid_write(inode, gid);
1497
1498         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1499                         sbi->s_fmode != UDF_INVALID_MODE)
1500                 inode->i_mode = sbi->s_fmode;
1501         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1502                         sbi->s_dmode != UDF_INVALID_MODE)
1503                 inode->i_mode = sbi->s_dmode;
1504         else
1505                 inode->i_mode = udf_convert_permissions(fe);
1506         inode->i_mode &= ~sbi->s_umask;
1507         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1508
1509         read_unlock(&sbi->s_cred_lock);
1510
1511         link_count = le16_to_cpu(fe->fileLinkCount);
1512         if (!link_count) {
1513                 if (!hidden_inode) {
1514                         ret = -ESTALE;
1515                         goto out;
1516                 }
1517                 link_count = 1;
1518         }
1519         set_nlink(inode, link_count);
1520
1521         inode->i_size = le64_to_cpu(fe->informationLength);
1522         iinfo->i_lenExtents = inode->i_size;
1523
1524         if (iinfo->i_efe == 0) {
1525                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1526                         (inode->i_sb->s_blocksize_bits - 9);
1527
1528                 udf_disk_stamp_to_time(&ts, fe->accessTime);
1529                 inode_set_atime_to_ts(inode, ts);
1530                 udf_disk_stamp_to_time(&ts, fe->modificationTime);
1531                 inode_set_mtime_to_ts(inode, ts);
1532                 udf_disk_stamp_to_time(&ts, fe->attrTime);
1533                 inode_set_ctime_to_ts(inode, ts);
1534
1535                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1536                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1537                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1538                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1539                 iinfo->i_streamdir = 0;
1540                 iinfo->i_lenStreams = 0;
1541         } else {
1542                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1543                     (inode->i_sb->s_blocksize_bits - 9);
1544
1545                 udf_disk_stamp_to_time(&ts, efe->accessTime);
1546                 inode_set_atime_to_ts(inode, ts);
1547                 udf_disk_stamp_to_time(&ts, efe->modificationTime);
1548                 inode_set_mtime_to_ts(inode, ts);
1549                 udf_disk_stamp_to_time(&ts, efe->attrTime);
1550                 inode_set_ctime_to_ts(inode, ts);
1551                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1552
1553                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1554                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1555                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1556                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1557
1558                 /* Named streams */
1559                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1560                 iinfo->i_locStreamdir =
1561                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1562                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1563                 if (iinfo->i_lenStreams >= inode->i_size)
1564                         iinfo->i_lenStreams -= inode->i_size;
1565                 else
1566                         iinfo->i_lenStreams = 0;
1567         }
1568         inode->i_generation = iinfo->i_unique;
1569
1570         /*
1571          * Sanity check length of allocation descriptors and extended attrs to
1572          * avoid integer overflows
1573          */
1574         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1575                 goto out;
1576         /* Now do exact checks */
1577         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1578                 goto out;
1579         /* Sanity checks for files in ICB so that we don't get confused later */
1580         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1581                 /*
1582                  * For file in ICB data is stored in allocation descriptor
1583                  * so sizes should match
1584                  */
1585                 if (iinfo->i_lenAlloc != inode->i_size)
1586                         goto out;
1587                 /* File in ICB has to fit in there... */
1588                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1589                         goto out;
1590         }
1591
1592         switch (fe->icbTag.fileType) {
1593         case ICBTAG_FILE_TYPE_DIRECTORY:
1594                 inode->i_op = &udf_dir_inode_operations;
1595                 inode->i_fop = &udf_dir_operations;
1596                 inode->i_mode |= S_IFDIR;
1597                 inc_nlink(inode);
1598                 break;
1599         case ICBTAG_FILE_TYPE_REALTIME:
1600         case ICBTAG_FILE_TYPE_REGULAR:
1601         case ICBTAG_FILE_TYPE_UNDEF:
1602         case ICBTAG_FILE_TYPE_VAT20:
1603                 inode->i_data.a_ops = &udf_aops;
1604                 inode->i_op = &udf_file_inode_operations;
1605                 inode->i_fop = &udf_file_operations;
1606                 inode->i_mode |= S_IFREG;
1607                 break;
1608         case ICBTAG_FILE_TYPE_BLOCK:
1609                 inode->i_mode |= S_IFBLK;
1610                 break;
1611         case ICBTAG_FILE_TYPE_CHAR:
1612                 inode->i_mode |= S_IFCHR;
1613                 break;
1614         case ICBTAG_FILE_TYPE_FIFO:
1615                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1616                 break;
1617         case ICBTAG_FILE_TYPE_SOCKET:
1618                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1619                 break;
1620         case ICBTAG_FILE_TYPE_SYMLINK:
1621                 inode->i_data.a_ops = &udf_symlink_aops;
1622                 inode->i_op = &udf_symlink_inode_operations;
1623                 inode_nohighmem(inode);
1624                 inode->i_mode = S_IFLNK | 0777;
1625                 break;
1626         case ICBTAG_FILE_TYPE_MAIN:
1627                 udf_debug("METADATA FILE-----\n");
1628                 break;
1629         case ICBTAG_FILE_TYPE_MIRROR:
1630                 udf_debug("METADATA MIRROR FILE-----\n");
1631                 break;
1632         case ICBTAG_FILE_TYPE_BITMAP:
1633                 udf_debug("METADATA BITMAP FILE-----\n");
1634                 break;
1635         default:
1636                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1637                         inode->i_ino, fe->icbTag.fileType);
1638                 goto out;
1639         }
1640         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1641                 struct deviceSpec *dsea =
1642                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1643                 if (dsea) {
1644                         init_special_inode(inode, inode->i_mode,
1645                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1646                                       le32_to_cpu(dsea->minorDeviceIdent)));
1647                         /* Developer ID ??? */
1648                 } else
1649                         goto out;
1650         }
1651         ret = 0;
1652 out:
1653         brelse(bh);
1654         return ret;
1655 }
1656
1657 static int udf_alloc_i_data(struct inode *inode, size_t size)
1658 {
1659         struct udf_inode_info *iinfo = UDF_I(inode);
1660         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1661         if (!iinfo->i_data)
1662                 return -ENOMEM;
1663         return 0;
1664 }
1665
1666 static umode_t udf_convert_permissions(struct fileEntry *fe)
1667 {
1668         umode_t mode;
1669         uint32_t permissions;
1670         uint32_t flags;
1671
1672         permissions = le32_to_cpu(fe->permissions);
1673         flags = le16_to_cpu(fe->icbTag.flags);
1674
1675         mode =  ((permissions) & 0007) |
1676                 ((permissions >> 2) & 0070) |
1677                 ((permissions >> 4) & 0700) |
1678                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1679                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1680                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1681
1682         return mode;
1683 }
1684
1685 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1686 {
1687         struct udf_inode_info *iinfo = UDF_I(inode);
1688
1689         /*
1690          * UDF 2.01 sec. 3.3.3.3 Note 2:
1691          * In Unix, delete permission tracks write
1692          */
1693         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1694         if (mode & 0200)
1695                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1696         if (mode & 0020)
1697                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1698         if (mode & 0002)
1699                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1700 }
1701
1702 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1703 {
1704         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1705 }
1706
1707 static int udf_sync_inode(struct inode *inode)
1708 {
1709         return udf_update_inode(inode, 1);
1710 }
1711
1712 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1713 {
1714         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1715             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1716              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1717                 iinfo->i_crtime = time;
1718 }
1719
1720 static int udf_update_inode(struct inode *inode, int do_sync)
1721 {
1722         struct buffer_head *bh = NULL;
1723         struct fileEntry *fe;
1724         struct extendedFileEntry *efe;
1725         uint64_t lb_recorded;
1726         uint32_t udfperms;
1727         uint16_t icbflags;
1728         uint16_t crclen;
1729         int err = 0;
1730         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1731         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1732         struct udf_inode_info *iinfo = UDF_I(inode);
1733
1734         bh = sb_getblk(inode->i_sb,
1735                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1736         if (!bh) {
1737                 udf_debug("getblk failure\n");
1738                 return -EIO;
1739         }
1740
1741         lock_buffer(bh);
1742         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1743         fe = (struct fileEntry *)bh->b_data;
1744         efe = (struct extendedFileEntry *)bh->b_data;
1745
1746         if (iinfo->i_use) {
1747                 struct unallocSpaceEntry *use =
1748                         (struct unallocSpaceEntry *)bh->b_data;
1749
1750                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1751                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1752                        iinfo->i_data, inode->i_sb->s_blocksize -
1753                                         sizeof(struct unallocSpaceEntry));
1754                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1755                 crclen = sizeof(struct unallocSpaceEntry);
1756
1757                 goto finish;
1758         }
1759
1760         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1761                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1762         else
1763                 fe->uid = cpu_to_le32(i_uid_read(inode));
1764
1765         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1766                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1767         else
1768                 fe->gid = cpu_to_le32(i_gid_read(inode));
1769
1770         udfperms = ((inode->i_mode & 0007)) |
1771                    ((inode->i_mode & 0070) << 2) |
1772                    ((inode->i_mode & 0700) << 4);
1773
1774         udfperms |= iinfo->i_extraPerms;
1775         fe->permissions = cpu_to_le32(udfperms);
1776
1777         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1778                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1779         else {
1780                 if (iinfo->i_hidden)
1781                         fe->fileLinkCount = cpu_to_le16(0);
1782                 else
1783                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1784         }
1785
1786         fe->informationLength = cpu_to_le64(inode->i_size);
1787
1788         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1789                 struct regid *eid;
1790                 struct deviceSpec *dsea =
1791                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1792                 if (!dsea) {
1793                         dsea = (struct deviceSpec *)
1794                                 udf_add_extendedattr(inode,
1795                                                      sizeof(struct deviceSpec) +
1796                                                      sizeof(struct regid), 12, 0x3);
1797                         dsea->attrType = cpu_to_le32(12);
1798                         dsea->attrSubtype = 1;
1799                         dsea->attrLength = cpu_to_le32(
1800                                                 sizeof(struct deviceSpec) +
1801                                                 sizeof(struct regid));
1802                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1803                 }
1804                 eid = (struct regid *)dsea->impUse;
1805                 memset(eid, 0, sizeof(*eid));
1806                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1807                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1808                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1809                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1810                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1811         }
1812
1813         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1814                 lb_recorded = 0; /* No extents => no blocks! */
1815         else
1816                 lb_recorded =
1817                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1818                         (blocksize_bits - 9);
1819
1820         if (iinfo->i_efe == 0) {
1821                 memcpy(bh->b_data + sizeof(struct fileEntry),
1822                        iinfo->i_data,
1823                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1824                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1825
1826                 udf_time_to_disk_stamp(&fe->accessTime, inode_get_atime(inode));
1827                 udf_time_to_disk_stamp(&fe->modificationTime, inode_get_mtime(inode));
1828                 udf_time_to_disk_stamp(&fe->attrTime, inode_get_ctime(inode));
1829                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1830                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1831                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1832                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1833                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1834                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1835                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1836                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1837                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1838                 crclen = sizeof(struct fileEntry);
1839         } else {
1840                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1841                        iinfo->i_data,
1842                        inode->i_sb->s_blocksize -
1843                                         sizeof(struct extendedFileEntry));
1844                 efe->objectSize =
1845                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1846                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1847
1848                 if (iinfo->i_streamdir) {
1849                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1850
1851                         icb_lad->extLocation =
1852                                 cpu_to_lelb(iinfo->i_locStreamdir);
1853                         icb_lad->extLength =
1854                                 cpu_to_le32(inode->i_sb->s_blocksize);
1855                 }
1856
1857                 udf_adjust_time(iinfo, inode_get_atime(inode));
1858                 udf_adjust_time(iinfo, inode_get_mtime(inode));
1859                 udf_adjust_time(iinfo, inode_get_ctime(inode));
1860
1861                 udf_time_to_disk_stamp(&efe->accessTime,
1862                                        inode_get_atime(inode));
1863                 udf_time_to_disk_stamp(&efe->modificationTime,
1864                                        inode_get_mtime(inode));
1865                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1866                 udf_time_to_disk_stamp(&efe->attrTime, inode_get_ctime(inode));
1867
1868                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1869                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1870                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1871                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1872                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1873                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1874                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1875                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1876                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1877                 crclen = sizeof(struct extendedFileEntry);
1878         }
1879
1880 finish:
1881         if (iinfo->i_strat4096) {
1882                 fe->icbTag.strategyType = cpu_to_le16(4096);
1883                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1884                 fe->icbTag.numEntries = cpu_to_le16(2);
1885         } else {
1886                 fe->icbTag.strategyType = cpu_to_le16(4);
1887                 fe->icbTag.numEntries = cpu_to_le16(1);
1888         }
1889
1890         if (iinfo->i_use)
1891                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1892         else if (S_ISDIR(inode->i_mode))
1893                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1894         else if (S_ISREG(inode->i_mode))
1895                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1896         else if (S_ISLNK(inode->i_mode))
1897                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1898         else if (S_ISBLK(inode->i_mode))
1899                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1900         else if (S_ISCHR(inode->i_mode))
1901                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1902         else if (S_ISFIFO(inode->i_mode))
1903                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1904         else if (S_ISSOCK(inode->i_mode))
1905                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1906
1907         icbflags =      iinfo->i_alloc_type |
1908                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1909                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1910                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1911                         (le16_to_cpu(fe->icbTag.flags) &
1912                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1913                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1914
1915         fe->icbTag.flags = cpu_to_le16(icbflags);
1916         if (sbi->s_udfrev >= 0x0200)
1917                 fe->descTag.descVersion = cpu_to_le16(3);
1918         else
1919                 fe->descTag.descVersion = cpu_to_le16(2);
1920         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1921         fe->descTag.tagLocation = cpu_to_le32(
1922                                         iinfo->i_location.logicalBlockNum);
1923         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1924         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1925         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1926                                                   crclen));
1927         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1928
1929         set_buffer_uptodate(bh);
1930         unlock_buffer(bh);
1931
1932         /* write the data blocks */
1933         mark_buffer_dirty(bh);
1934         if (do_sync) {
1935                 sync_dirty_buffer(bh);
1936                 if (buffer_write_io_error(bh)) {
1937                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1938                                  inode->i_ino);
1939                         err = -EIO;
1940                 }
1941         }
1942         brelse(bh);
1943
1944         return err;
1945 }
1946
1947 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1948                          bool hidden_inode)
1949 {
1950         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1951         struct inode *inode = iget_locked(sb, block);
1952         int err;
1953
1954         if (!inode)
1955                 return ERR_PTR(-ENOMEM);
1956
1957         if (!(inode->i_state & I_NEW)) {
1958                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1959                         iput(inode);
1960                         return ERR_PTR(-EFSCORRUPTED);
1961                 }
1962                 return inode;
1963         }
1964
1965         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1966         err = udf_read_inode(inode, hidden_inode);
1967         if (err < 0) {
1968                 iget_failed(inode);
1969                 return ERR_PTR(err);
1970         }
1971         unlock_new_inode(inode);
1972
1973         return inode;
1974 }
1975
1976 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1977                             struct extent_position *epos)
1978 {
1979         struct super_block *sb = inode->i_sb;
1980         struct buffer_head *bh;
1981         struct allocExtDesc *aed;
1982         struct extent_position nepos;
1983         struct kernel_lb_addr neloc;
1984         int ver, adsize;
1985         int err = 0;
1986
1987         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1988                 adsize = sizeof(struct short_ad);
1989         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1990                 adsize = sizeof(struct long_ad);
1991         else
1992                 return -EIO;
1993
1994         neloc.logicalBlockNum = block;
1995         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1996
1997         bh = sb_getblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1998         if (!bh)
1999                 return -EIO;
2000         lock_buffer(bh);
2001         memset(bh->b_data, 0x00, sb->s_blocksize);
2002         set_buffer_uptodate(bh);
2003         unlock_buffer(bh);
2004         mark_buffer_dirty_inode(bh, inode);
2005
2006         aed = (struct allocExtDesc *)(bh->b_data);
2007         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
2008                 aed->previousAllocExtLocation =
2009                                 cpu_to_le32(epos->block.logicalBlockNum);
2010         }
2011         aed->lengthAllocDescs = cpu_to_le32(0);
2012         if (UDF_SB(sb)->s_udfrev >= 0x0200)
2013                 ver = 3;
2014         else
2015                 ver = 2;
2016         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
2017                     sizeof(struct tag));
2018
2019         nepos.block = neloc;
2020         nepos.offset = sizeof(struct allocExtDesc);
2021         nepos.bh = bh;
2022
2023         /*
2024          * Do we have to copy current last extent to make space for indirect
2025          * one?
2026          */
2027         if (epos->offset + adsize > sb->s_blocksize) {
2028                 struct kernel_lb_addr cp_loc;
2029                 uint32_t cp_len;
2030                 int8_t cp_type;
2031
2032                 epos->offset -= adsize;
2033                 err = udf_current_aext(inode, epos, &cp_loc, &cp_len, &cp_type, 0);
2034                 if (err <= 0)
2035                         goto err_out;
2036                 cp_len |= ((uint32_t)cp_type) << 30;
2037
2038                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
2039                 udf_write_aext(inode, epos, &nepos.block,
2040                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2041         } else {
2042                 __udf_add_aext(inode, epos, &nepos.block,
2043                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
2044         }
2045
2046         brelse(epos->bh);
2047         *epos = nepos;
2048
2049         return 0;
2050 err_out:
2051         brelse(bh);
2052         return err;
2053 }
2054
2055 /*
2056  * Append extent at the given position - should be the first free one in inode
2057  * / indirect extent. This function assumes there is enough space in the inode
2058  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2059  */
2060 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2061                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2062 {
2063         struct udf_inode_info *iinfo = UDF_I(inode);
2064         struct allocExtDesc *aed;
2065         int adsize;
2066
2067         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2068                 adsize = sizeof(struct short_ad);
2069         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2070                 adsize = sizeof(struct long_ad);
2071         else
2072                 return -EIO;
2073
2074         if (!epos->bh) {
2075                 WARN_ON(iinfo->i_lenAlloc !=
2076                         epos->offset - udf_file_entry_alloc_offset(inode));
2077         } else {
2078                 aed = (struct allocExtDesc *)epos->bh->b_data;
2079                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2080                         epos->offset - sizeof(struct allocExtDesc));
2081                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2082         }
2083
2084         udf_write_aext(inode, epos, eloc, elen, inc);
2085
2086         if (!epos->bh) {
2087                 iinfo->i_lenAlloc += adsize;
2088                 mark_inode_dirty(inode);
2089         } else {
2090                 aed = (struct allocExtDesc *)epos->bh->b_data;
2091                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2092                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2093                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2094                         udf_update_tag(epos->bh->b_data,
2095                                         epos->offset + (inc ? 0 : adsize));
2096                 else
2097                         udf_update_tag(epos->bh->b_data,
2098                                         sizeof(struct allocExtDesc));
2099                 mark_buffer_dirty_inode(epos->bh, inode);
2100         }
2101
2102         return 0;
2103 }
2104
2105 /*
2106  * Append extent at given position - should be the first free one in inode
2107  * / indirect extent. Takes care of allocating and linking indirect blocks.
2108  */
2109 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2110                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2111 {
2112         int adsize;
2113         struct super_block *sb = inode->i_sb;
2114
2115         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2116                 adsize = sizeof(struct short_ad);
2117         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2118                 adsize = sizeof(struct long_ad);
2119         else
2120                 return -EIO;
2121
2122         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2123                 int err;
2124                 udf_pblk_t new_block;
2125
2126                 new_block = udf_new_block(sb, NULL,
2127                                           epos->block.partitionReferenceNum,
2128                                           epos->block.logicalBlockNum, &err);
2129                 if (!new_block)
2130                         return -ENOSPC;
2131
2132                 err = udf_setup_indirect_aext(inode, new_block, epos);
2133                 if (err)
2134                         return err;
2135         }
2136
2137         return __udf_add_aext(inode, epos, eloc, elen, inc);
2138 }
2139
2140 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2141                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2142 {
2143         int adsize;
2144         uint8_t *ptr;
2145         struct short_ad *sad;
2146         struct long_ad *lad;
2147         struct udf_inode_info *iinfo = UDF_I(inode);
2148
2149         if (!epos->bh)
2150                 ptr = iinfo->i_data + epos->offset -
2151                         udf_file_entry_alloc_offset(inode) +
2152                         iinfo->i_lenEAttr;
2153         else
2154                 ptr = epos->bh->b_data + epos->offset;
2155
2156         switch (iinfo->i_alloc_type) {
2157         case ICBTAG_FLAG_AD_SHORT:
2158                 sad = (struct short_ad *)ptr;
2159                 sad->extLength = cpu_to_le32(elen);
2160                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2161                 adsize = sizeof(struct short_ad);
2162                 break;
2163         case ICBTAG_FLAG_AD_LONG:
2164                 lad = (struct long_ad *)ptr;
2165                 lad->extLength = cpu_to_le32(elen);
2166                 lad->extLocation = cpu_to_lelb(*eloc);
2167                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2168                 adsize = sizeof(struct long_ad);
2169                 break;
2170         default:
2171                 return;
2172         }
2173
2174         if (epos->bh) {
2175                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2176                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2177                         struct allocExtDesc *aed =
2178                                 (struct allocExtDesc *)epos->bh->b_data;
2179                         udf_update_tag(epos->bh->b_data,
2180                                        le32_to_cpu(aed->lengthAllocDescs) +
2181                                        sizeof(struct allocExtDesc));
2182                 }
2183                 mark_buffer_dirty_inode(epos->bh, inode);
2184         } else {
2185                 mark_inode_dirty(inode);
2186         }
2187
2188         if (inc)
2189                 epos->offset += adsize;
2190 }
2191
2192 /*
2193  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2194  * someone does some weird stuff.
2195  */
2196 #define UDF_MAX_INDIR_EXTS 16
2197
2198 /*
2199  * Returns 1 on success, -errno on error, 0 on hit EOF.
2200  */
2201 int udf_next_aext(struct inode *inode, struct extent_position *epos,
2202                   struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype,
2203                   int inc)
2204 {
2205         unsigned int indirections = 0;
2206         int ret = 0;
2207         udf_pblk_t block;
2208
2209         while (1) {
2210                 ret = udf_current_aext(inode, epos, eloc, elen,
2211                                        etype, inc);
2212                 if (ret <= 0)
2213                         return ret;
2214                 if (*etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30))
2215                         return ret;
2216
2217                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2218                         udf_err(inode->i_sb,
2219                                 "too many indirect extents in inode %lu\n",
2220                                 inode->i_ino);
2221                         return -EFSCORRUPTED;
2222                 }
2223
2224                 epos->block = *eloc;
2225                 epos->offset = sizeof(struct allocExtDesc);
2226                 brelse(epos->bh);
2227                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2228                 epos->bh = sb_bread(inode->i_sb, block);
2229                 if (!epos->bh) {
2230                         udf_debug("reading block %u failed!\n", block);
2231                         return -EIO;
2232                 }
2233         }
2234 }
2235
2236 /*
2237  * Returns 1 on success, -errno on error, 0 on hit EOF.
2238  */
2239 int udf_current_aext(struct inode *inode, struct extent_position *epos,
2240                      struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype,
2241                      int inc)
2242 {
2243         int alen;
2244         uint8_t *ptr;
2245         struct short_ad *sad;
2246         struct long_ad *lad;
2247         struct udf_inode_info *iinfo = UDF_I(inode);
2248
2249         if (!epos->bh) {
2250                 if (!epos->offset)
2251                         epos->offset = udf_file_entry_alloc_offset(inode);
2252                 ptr = iinfo->i_data + epos->offset -
2253                         udf_file_entry_alloc_offset(inode) +
2254                         iinfo->i_lenEAttr;
2255                 alen = udf_file_entry_alloc_offset(inode) +
2256                                                         iinfo->i_lenAlloc;
2257         } else {
2258                 struct allocExtDesc *header =
2259                         (struct allocExtDesc *)epos->bh->b_data;
2260
2261                 if (!epos->offset)
2262                         epos->offset = sizeof(struct allocExtDesc);
2263                 ptr = epos->bh->b_data + epos->offset;
2264                 if (check_add_overflow(sizeof(struct allocExtDesc),
2265                                 le32_to_cpu(header->lengthAllocDescs), &alen))
2266                         return -1;
2267         }
2268
2269         switch (iinfo->i_alloc_type) {
2270         case ICBTAG_FLAG_AD_SHORT:
2271                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2272                 if (!sad)
2273                         return 0;
2274                 *etype = le32_to_cpu(sad->extLength) >> 30;
2275                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2276                 eloc->partitionReferenceNum =
2277                                 iinfo->i_location.partitionReferenceNum;
2278                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2279                 break;
2280         case ICBTAG_FLAG_AD_LONG:
2281                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2282                 if (!lad)
2283                         return 0;
2284                 *etype = le32_to_cpu(lad->extLength) >> 30;
2285                 *eloc = lelb_to_cpu(lad->extLocation);
2286                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2287                 break;
2288         default:
2289                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2290                 return -EINVAL;
2291         }
2292
2293         return 1;
2294 }
2295
2296 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2297                            struct kernel_lb_addr neloc, uint32_t nelen)
2298 {
2299         struct kernel_lb_addr oeloc;
2300         uint32_t oelen;
2301         int8_t etype;
2302         int ret;
2303
2304         if (epos.bh)
2305                 get_bh(epos.bh);
2306
2307         while (1) {
2308                 ret = udf_next_aext(inode, &epos, &oeloc, &oelen, &etype, 0);
2309                 if (ret <= 0)
2310                         break;
2311                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2312                 neloc = oeloc;
2313                 nelen = (etype << 30) | oelen;
2314         }
2315         if (ret == 0)
2316                 ret = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2317         brelse(epos.bh);
2318
2319         return ret;
2320 }
2321
2322 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2323 {
2324         struct extent_position oepos;
2325         int adsize;
2326         int8_t etype;
2327         struct allocExtDesc *aed;
2328         struct udf_inode_info *iinfo;
2329         struct kernel_lb_addr eloc;
2330         uint32_t elen;
2331         int ret;
2332
2333         if (epos.bh) {
2334                 get_bh(epos.bh);
2335                 get_bh(epos.bh);
2336         }
2337
2338         iinfo = UDF_I(inode);
2339         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2340                 adsize = sizeof(struct short_ad);
2341         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2342                 adsize = sizeof(struct long_ad);
2343         else
2344                 adsize = 0;
2345
2346         oepos = epos;
2347         if (udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1) <= 0)
2348                 return -1;
2349
2350         while (1) {
2351                 ret = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1);
2352                 if (ret < 0) {
2353                         brelse(epos.bh);
2354                         brelse(oepos.bh);
2355                         return -1;
2356                 }
2357                 if (ret == 0)
2358                         break;
2359                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2360                 if (oepos.bh != epos.bh) {
2361                         oepos.block = epos.block;
2362                         brelse(oepos.bh);
2363                         get_bh(epos.bh);
2364                         oepos.bh = epos.bh;
2365                         oepos.offset = epos.offset - adsize;
2366                 }
2367         }
2368         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2369         elen = 0;
2370
2371         if (epos.bh != oepos.bh) {
2372                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2373                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2374                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2375                 if (!oepos.bh) {
2376                         iinfo->i_lenAlloc -= (adsize * 2);
2377                         mark_inode_dirty(inode);
2378                 } else {
2379                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2380                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2381                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2382                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2383                                 udf_update_tag(oepos.bh->b_data,
2384                                                 oepos.offset - (2 * adsize));
2385                         else
2386                                 udf_update_tag(oepos.bh->b_data,
2387                                                 sizeof(struct allocExtDesc));
2388                         mark_buffer_dirty_inode(oepos.bh, inode);
2389                 }
2390         } else {
2391                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2392                 if (!oepos.bh) {
2393                         iinfo->i_lenAlloc -= adsize;
2394                         mark_inode_dirty(inode);
2395                 } else {
2396                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2397                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2398                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2399                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2400                                 udf_update_tag(oepos.bh->b_data,
2401                                                 epos.offset - adsize);
2402                         else
2403                                 udf_update_tag(oepos.bh->b_data,
2404                                                 sizeof(struct allocExtDesc));
2405                         mark_buffer_dirty_inode(oepos.bh, inode);
2406                 }
2407         }
2408
2409         brelse(epos.bh);
2410         brelse(oepos.bh);
2411
2412         return (elen >> 30);
2413 }
2414
2415 /*
2416  * Returns 1 on success, -errno on error, 0 on hit EOF.
2417  */
2418 int inode_bmap(struct inode *inode, sector_t block, struct extent_position *pos,
2419                struct kernel_lb_addr *eloc, uint32_t *elen, sector_t *offset,
2420                int8_t *etype)
2421 {
2422         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2423         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2424         struct udf_inode_info *iinfo;
2425         int err = 0;
2426
2427         iinfo = UDF_I(inode);
2428         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2429                 pos->offset = 0;
2430                 pos->block = iinfo->i_location;
2431                 pos->bh = NULL;
2432         }
2433         *elen = 0;
2434         do {
2435                 err = udf_next_aext(inode, pos, eloc, elen, etype, 1);
2436                 if (err <= 0) {
2437                         if (err == 0) {
2438                                 *offset = (bcount - lbcount) >> blocksize_bits;
2439                                 iinfo->i_lenExtents = lbcount;
2440                         }
2441                         return err;
2442                 }
2443                 lbcount += *elen;
2444         } while (lbcount <= bcount);
2445         /* update extent cache */
2446         udf_update_extent_cache(inode, lbcount - *elen, pos);
2447         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2448
2449         return 1;
2450 }