fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 #define EXTENT_MERGE_SIZE 5
  47
  48 static umode_t udf_convert_permissions(struct fileEntry *);
  49 static int udf_update_inode(struct inode *, int);
  50 static int udf_sync_inode(struct inode *inode);
  51 static int udf_alloc_i_data(struct inode *inode, size_t size);
  52 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  53 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  54                               struct kernel_lb_addr, uint32_t);
  55 static void udf_split_extents(struct inode *, int *, int, int,
  56                               struct kernel_long_ad *, int *);
  57 static void udf_prealloc_extents(struct inode *, int, int,
  58                                  struct kernel_long_ad *, int *);
  59 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  60 static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  61                                int, struct extent_position *);
  62 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  63
  64 static void __udf_clear_extent_cache(struct inode *inode)
  65 {
  66         struct udf_inode_info *iinfo = UDF_I(inode);
  67
  68         if (iinfo->cached_extent.lstart != -1) {
  69                 brelse(iinfo->cached_extent.epos.bh);
  70                 iinfo->cached_extent.lstart = -1;
  71         }
  72 }
  73
  74 /* Invalidate extent cache */
  75 static void udf_clear_extent_cache(struct inode *inode)
  76 {
  77         struct udf_inode_info *iinfo = UDF_I(inode);
  78
  79         spin_lock(&iinfo->i_extent_cache_lock);
  80         __udf_clear_extent_cache(inode);
  81         spin_unlock(&iinfo->i_extent_cache_lock);
  82 }
  83
  84 /* Return contents of extent cache */
  85 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  86                                  loff_t *lbcount, struct extent_position *pos)
  87 {
  88         struct udf_inode_info *iinfo = UDF_I(inode);
  89         int ret = 0;
  90
  91         spin_lock(&iinfo->i_extent_cache_lock);
  92         if ((iinfo->cached_extent.lstart <= bcount) &&
  93             (iinfo->cached_extent.lstart != -1)) {
  94                 /* Cache hit */
  95                 *lbcount = iinfo->cached_extent.lstart;
  96                 memcpy(pos, &iinfo->cached_extent.epos,
  97                        sizeof(struct extent_position));
  98                 if (pos->bh)
  99                         get_bh(pos->bh);
 100                 ret = 1;
 101         }
 102         spin_unlock(&iinfo->i_extent_cache_lock);
 103         return ret;
 104 }
 105
 106 /* Add extent to extent cache */
 107 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 108                                     struct extent_position *pos)
 109 {
 110         struct udf_inode_info *iinfo = UDF_I(inode);
 111
 112         spin_lock(&iinfo->i_extent_cache_lock);
 113         /* Invalidate previously cached extent */
 114         __udf_clear_extent_cache(inode);
 115         if (pos->bh)
 116                 get_bh(pos->bh);
 117         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 118         iinfo->cached_extent.lstart = estart;
 119         switch (iinfo->i_alloc_type) {
 120         case ICBTAG_FLAG_AD_SHORT:
 121                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 122                 break;
 123         case ICBTAG_FLAG_AD_LONG:
 124                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 125                 break;
 126         }
 127         spin_unlock(&iinfo->i_extent_cache_lock);
 128 }
 129
 130 void udf_evict_inode(struct inode *inode)
 131 {
 132         struct udf_inode_info *iinfo = UDF_I(inode);
 133         int want_delete = 0;
 134
 135         if (!is_bad_inode(inode)) {
 136                 if (!inode->i_nlink) {
 137                         want_delete = 1;
 138                         udf_setsize(inode, 0);
 139                         udf_update_inode(inode, IS_SYNC(inode));
 140                 }
 141                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 142                     inode->i_size != iinfo->i_lenExtents) {
 143                         udf_warn(inode->i_sb,
 144                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 145                                  inode->i_ino, inode->i_mode,
 146                                  (unsigned long long)inode->i_size,
 147                                  (unsigned long long)iinfo->i_lenExtents);
 148                 }
 149         }
 150         truncate_inode_pages_final(&inode->i_data);
 151         invalidate_inode_buffers(inode);
 152         clear_inode(inode);
 153         kfree(iinfo->i_ext.i_data);
 154         iinfo->i_ext.i_data = NULL;
 155         udf_clear_extent_cache(inode);
 156         if (want_delete) {
 157                 udf_free_inode(inode);
 158         }
 159 }
 160
 161 static void udf_write_failed(struct address_space *mapping, loff_t to)
 162 {
 163         struct inode *inode = mapping->host;
 164         struct udf_inode_info *iinfo = UDF_I(inode);
 165         loff_t isize = inode->i_size;
 166
 167         if (to > isize) {
 168                 truncate_pagecache(inode, isize);
 169                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 170                         down_write(&iinfo->i_data_sem);
 171                         udf_clear_extent_cache(inode);
 172                         udf_truncate_extents(inode);
 173                         up_write(&iinfo->i_data_sem);
 174                 }
 175         }
 176 }
 177
 178 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 179 {
 180         return block_write_full_page(page, udf_get_block, wbc);
 181 }
 182
 183 static int udf_writepages(struct address_space *mapping,
 184                         struct writeback_control *wbc)
 185 {
 186         return mpage_writepages(mapping, wbc, udf_get_block);
 187 }
 188
 189 static int udf_readpage(struct file *file, struct page *page)
 190 {
 191         return mpage_readpage(page, udf_get_block);
 192 }
 193
 194 static int udf_readpages(struct file *file, struct address_space *mapping,
 195                         struct list_head *pages, unsigned nr_pages)
 196 {
 197         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 198 }
 199
 200 static int udf_write_begin(struct file *file, struct address_space *mapping,
 201                         loff_t pos, unsigned len, unsigned flags,
 202                         struct page **pagep, void **fsdata)
 203 {
 204         int ret;
 205
 206         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 207         if (unlikely(ret))
 208                 udf_write_failed(mapping, pos + len);
 209         return ret;
 210 }
 211
 212 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 213 {
 214         struct file *file = iocb->ki_filp;
 215         struct address_space *mapping = file->f_mapping;
 216         struct inode *inode = mapping->host;
 217         size_t count = iov_iter_count(iter);
 218         ssize_t ret;
 219
 220         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 221         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 222                 udf_write_failed(mapping, iocb->ki_pos + count);
 223         return ret;
 224 }
 225
 226 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 227 {
 228         return generic_block_bmap(mapping, block, udf_get_block);
 229 }
 230
 231 const struct address_space_operations udf_aops = {
 232         .readpage       = udf_readpage,
 233         .readpages      = udf_readpages,
 234         .writepage      = udf_writepage,
 235         .writepages     = udf_writepages,
 236         .write_begin    = udf_write_begin,
 237         .write_end      = generic_write_end,
 238         .direct_IO      = udf_direct_IO,
 239         .bmap           = udf_bmap,
 240 };
 241
 242 /*
 243  * Expand file stored in ICB to a normal one-block-file
 244  *
 245  * This function requires i_data_sem for writing and releases it.
 246  * This function requires i_mutex held
 247  */
 248 int udf_expand_file_adinicb(struct inode *inode)
 249 {
 250         struct page *page;
 251         char *kaddr;
 252         struct udf_inode_info *iinfo = UDF_I(inode);
 253         int err;
 254         struct writeback_control udf_wbc = {
 255                 .sync_mode = WB_SYNC_NONE,
 256                 .nr_to_write = 1,
 257         };
 258
 259         WARN_ON_ONCE(!inode_is_locked(inode));
 260         if (!iinfo->i_lenAlloc) {
 261                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 262                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 263                 else
 264                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 265                 /* from now on we have normal address_space methods */
 266                 inode->i_data.a_ops = &udf_aops;
 267                 up_write(&iinfo->i_data_sem);
 268                 mark_inode_dirty(inode);
 269                 return 0;
 270         }
 271         /*
 272          * Release i_data_sem so that we can lock a page - page lock ranks
 273          * above i_data_sem. i_mutex still protects us against file changes.
 274          */
 275         up_write(&iinfo->i_data_sem);
 276
 277         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 278         if (!page)
 279                 return -ENOMEM;
 280
 281         if (!PageUptodate(page)) {
 282                 kaddr = kmap_atomic(page);
 283                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 284                        PAGE_SIZE - iinfo->i_lenAlloc);
 285                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 286                         iinfo->i_lenAlloc);
 287                 flush_dcache_page(page);
 288                 SetPageUptodate(page);
 289                 kunmap_atomic(kaddr);
 290         }
 291         down_write(&iinfo->i_data_sem);
 292         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 293                iinfo->i_lenAlloc);
 294         iinfo->i_lenAlloc = 0;
 295         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 296                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 297         else
 298                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 299         /* from now on we have normal address_space methods */
 300         inode->i_data.a_ops = &udf_aops;
 301         up_write(&iinfo->i_data_sem);
 302         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 303         if (err) {
 304                 /* Restore everything back so that we don't lose data... */
 305                 lock_page(page);
 306                 down_write(&iinfo->i_data_sem);
 307                 kaddr = kmap_atomic(page);
 308                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 309                        inode->i_size);
 310                 kunmap_atomic(kaddr);
 311                 unlock_page(page);
 312                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 313                 inode->i_data.a_ops = &udf_adinicb_aops;
 314                 up_write(&iinfo->i_data_sem);
 315         }
 316         put_page(page);
 317         mark_inode_dirty(inode);
 318
 319         return err;
 320 }
 321
 322 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 323                                            int *err)
 324 {
 325         int newblock;
 326         struct buffer_head *dbh = NULL;
 327         struct kernel_lb_addr eloc;
 328         uint8_t alloctype;
 329         struct extent_position epos;
 330
 331         struct udf_fileident_bh sfibh, dfibh;
 332         loff_t f_pos = udf_ext0_offset(inode);
 333         int size = udf_ext0_offset(inode) + inode->i_size;
 334         struct fileIdentDesc cfi, *sfi, *dfi;
 335         struct udf_inode_info *iinfo = UDF_I(inode);
 336
 337         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 338                 alloctype = ICBTAG_FLAG_AD_SHORT;
 339         else
 340                 alloctype = ICBTAG_FLAG_AD_LONG;
 341
 342         if (!inode->i_size) {
 343                 iinfo->i_alloc_type = alloctype;
 344                 mark_inode_dirty(inode);
 345                 return NULL;
 346         }
 347
 348         /* alloc block, and copy data to it */
 349         *block = udf_new_block(inode->i_sb, inode,
 350                                iinfo->i_location.partitionReferenceNum,
 351                                iinfo->i_location.logicalBlockNum, err);
 352         if (!(*block))
 353                 return NULL;
 354         newblock = udf_get_pblock(inode->i_sb, *block,
 355                                   iinfo->i_location.partitionReferenceNum,
 356                                 0);
 357         if (!newblock)
 358                 return NULL;
 359         dbh = udf_tgetblk(inode->i_sb, newblock);
 360         if (!dbh)
 361                 return NULL;
 362         lock_buffer(dbh);
 363         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 364         set_buffer_uptodate(dbh);
 365         unlock_buffer(dbh);
 366         mark_buffer_dirty_inode(dbh, inode);
 367
 368         sfibh.soffset = sfibh.eoffset =
 369                         f_pos & (inode->i_sb->s_blocksize - 1);
 370         sfibh.sbh = sfibh.ebh = NULL;
 371         dfibh.soffset = dfibh.eoffset = 0;
 372         dfibh.sbh = dfibh.ebh = dbh;
 373         while (f_pos < size) {
 374                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 375                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 376                                          NULL, NULL, NULL);
 377                 if (!sfi) {
 378                         brelse(dbh);
 379                         return NULL;
 380                 }
 381                 iinfo->i_alloc_type = alloctype;
 382                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 383                 dfibh.soffset = dfibh.eoffset;
 384                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 385                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 386                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 387                                  sfi->fileIdent +
 388                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 389                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 390                         brelse(dbh);
 391                         return NULL;
 392                 }
 393         }
 394         mark_buffer_dirty_inode(dbh, inode);
 395
 396         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 397                 iinfo->i_lenAlloc);
 398         iinfo->i_lenAlloc = 0;
 399         eloc.logicalBlockNum = *block;
 400         eloc.partitionReferenceNum =
 401                                 iinfo->i_location.partitionReferenceNum;
 402         iinfo->i_lenExtents = inode->i_size;
 403         epos.bh = NULL;
 404         epos.block = iinfo->i_location;
 405         epos.offset = udf_file_entry_alloc_offset(inode);
 406         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 407         /* UniqueID stuff */
 408
 409         brelse(epos.bh);
 410         mark_inode_dirty(inode);
 411         return dbh;
 412 }
 413
 414 static int udf_get_block(struct inode *inode, sector_t block,
 415                          struct buffer_head *bh_result, int create)
 416 {
 417         int err, new;
 418         sector_t phys = 0;
 419         struct udf_inode_info *iinfo;
 420
 421         if (!create) {
 422                 phys = udf_block_map(inode, block);
 423                 if (phys)
 424                         map_bh(bh_result, inode->i_sb, phys);
 425                 return 0;
 426         }
 427
 428         err = -EIO;
 429         new = 0;
 430         iinfo = UDF_I(inode);
 431
 432         down_write(&iinfo->i_data_sem);
 433         if (block == iinfo->i_next_alloc_block + 1) {
 434                 iinfo->i_next_alloc_block++;
 435                 iinfo->i_next_alloc_goal++;
 436         }
 437
 438         udf_clear_extent_cache(inode);
 439         phys = inode_getblk(inode, block, &err, &new);
 440         if (!phys)
 441                 goto abort;
 442
 443         if (new)
 444                 set_buffer_new(bh_result);
 445         map_bh(bh_result, inode->i_sb, phys);
 446
 447 abort:
 448         up_write(&iinfo->i_data_sem);
 449         return err;
 450 }
 451
 452 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 453                                       int create, int *err)
 454 {
 455         struct buffer_head *bh;
 456         struct buffer_head dummy;
 457
 458         dummy.b_state = 0;
 459         dummy.b_blocknr = -1000;
 460         *err = udf_get_block(inode, block, &dummy, create);
 461         if (!*err && buffer_mapped(&dummy)) {
 462                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 463                 if (buffer_new(&dummy)) {
 464                         lock_buffer(bh);
 465                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 466                         set_buffer_uptodate(bh);
 467                         unlock_buffer(bh);
 468                         mark_buffer_dirty_inode(bh, inode);
 469                 }
 470                 return bh;
 471         }
 472
 473         return NULL;
 474 }
 475
 476 /* Extend the file with new blocks totaling 'new_block_bytes',
 477  * return the number of extents added
 478  */
 479 static int udf_do_extend_file(struct inode *inode,
 480                               struct extent_position *last_pos,
 481                               struct kernel_long_ad *last_ext,
 482                               loff_t new_block_bytes)
 483 {
 484         uint32_t add;
 485         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 486         struct super_block *sb = inode->i_sb;
 487         struct kernel_lb_addr prealloc_loc = {};
 488         int prealloc_len = 0;
 489         struct udf_inode_info *iinfo;
 490         int err;
 491
 492         /* The previous extent is fake and we should not extend by anything
 493          * - there's nothing to do... */
 494         if (!new_block_bytes && fake)
 495                 return 0;
 496
 497         iinfo = UDF_I(inode);
 498         /* Round the last extent up to a multiple of block size */
 499         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 500                 last_ext->extLength =
 501                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 502                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 503                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 504                 iinfo->i_lenExtents =
 505                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 506                         ~(sb->s_blocksize - 1);
 507         }
 508
 509         /* Last extent are just preallocated blocks? */
 510         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 511                                                 EXT_NOT_RECORDED_ALLOCATED) {
 512                 /* Save the extent so that we can reattach it to the end */
 513                 prealloc_loc = last_ext->extLocation;
 514                 prealloc_len = last_ext->extLength;
 515                 /* Mark the extent as a hole */
 516                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 517                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 518                 last_ext->extLocation.logicalBlockNum = 0;
 519                 last_ext->extLocation.partitionReferenceNum = 0;
 520         }
 521
 522         /* Can we merge with the previous extent? */
 523         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 524                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 525                 add = (1 << 30) - sb->s_blocksize -
 526                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 527                 if (add > new_block_bytes)
 528                         add = new_block_bytes;
 529                 new_block_bytes -= add;
 530                 last_ext->extLength += add;
 531         }
 532
 533         if (fake) {
 534                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 535                              last_ext->extLength, 1);
 536                 count++;
 537         } else {
 538                 struct kernel_lb_addr tmploc;
 539                 uint32_t tmplen;
 540
 541                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 542                                 last_ext->extLength, 1);
 543
 544                 /*
 545                  * We've rewritten the last extent. If we are going to add
 546                  * more extents, we may need to enter possible following
 547                  * empty indirect extent.
 548                  */
 549                 if (new_block_bytes || prealloc_len)
 550                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 551         }
 552
 553         /* Managed to do everything necessary? */
 554         if (!new_block_bytes)
 555                 goto out;
 556
 557         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 558         last_ext->extLocation.logicalBlockNum = 0;
 559         last_ext->extLocation.partitionReferenceNum = 0;
 560         add = (1 << 30) - sb->s_blocksize;
 561         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 562
 563         /* Create enough extents to cover the whole hole */
 564         while (new_block_bytes > add) {
 565                 new_block_bytes -= add;
 566                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 567                                    last_ext->extLength, 1);
 568                 if (err)
 569                         return err;
 570                 count++;
 571         }
 572         if (new_block_bytes) {
 573                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 574                         new_block_bytes;
 575                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 576                                    last_ext->extLength, 1);
 577                 if (err)
 578                         return err;
 579                 count++;
 580         }
 581
 582 out:
 583         /* Do we have some preallocated blocks saved? */
 584         if (prealloc_len) {
 585                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 586                                    prealloc_len, 1);
 587                 if (err)
 588                         return err;
 589                 last_ext->extLocation = prealloc_loc;
 590                 last_ext->extLength = prealloc_len;
 591                 count++;
 592         }
 593
 594         /* last_pos should point to the last written extent... */
 595         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 596                 last_pos->offset -= sizeof(struct short_ad);
 597         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 598                 last_pos->offset -= sizeof(struct long_ad);
 599         else
 600                 return -EIO;
 601
 602         return count;
 603 }
 604
 605 /* Extend the final block of the file to final_block_len bytes */
 606 static void udf_do_extend_final_block(struct inode *inode,
 607                                       struct extent_position *last_pos,
 608                                       struct kernel_long_ad *last_ext,
 609                                       uint32_t final_block_len)
 610 {
 611         struct super_block *sb = inode->i_sb;
 612         uint32_t added_bytes;
 613
 614         added_bytes = final_block_len -
 615                       (last_ext->extLength & (sb->s_blocksize - 1));
 616         last_ext->extLength += added_bytes;
 617         UDF_I(inode)->i_lenExtents += added_bytes;
 618
 619         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 620                         last_ext->extLength, 1);
 621 }
 622
 623 static int udf_extend_file(struct inode *inode, loff_t newsize)
 624 {
 625
 626         struct extent_position epos;
 627         struct kernel_lb_addr eloc;
 628         uint32_t elen;
 629         int8_t etype;
 630         struct super_block *sb = inode->i_sb;
 631         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 632         unsigned long partial_final_block;
 633         int adsize;
 634         struct udf_inode_info *iinfo = UDF_I(inode);
 635         struct kernel_long_ad extent;
 636         int err = 0;
 637         int within_final_block;
 638
 639         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 640                 adsize = sizeof(struct short_ad);
 641         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 642                 adsize = sizeof(struct long_ad);
 643         else
 644                 BUG();
 645
 646         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 647         within_final_block = (etype != -1);
 648
 649         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 650             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 651                 /* File has no extents at all or has empty last
 652                  * indirect extent! Create a fake extent... */
 653                 extent.extLocation.logicalBlockNum = 0;
 654                 extent.extLocation.partitionReferenceNum = 0;
 655                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 656         } else {
 657                 epos.offset -= adsize;
 658                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 659                                       &extent.extLength, 0);
 660                 extent.extLength |= etype << 30;
 661         }
 662
 663         partial_final_block = newsize & (sb->s_blocksize - 1);
 664
 665         /* File has extent covering the new size (could happen when extending
 666          * inside a block)?
 667          */
 668         if (within_final_block) {
 669                 /* Extending file within the last file block */
 670                 udf_do_extend_final_block(inode, &epos, &extent,
 671                                           partial_final_block);
 672         } else {
 673                 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
 674                              partial_final_block;
 675                 err = udf_do_extend_file(inode, &epos, &extent, add);
 676         }
 677
 678         if (err < 0)
 679                 goto out;
 680         err = 0;
 681         iinfo->i_lenExtents = newsize;
 682 out:
 683         brelse(epos.bh);
 684         return err;
 685 }
 686
 687 static sector_t inode_getblk(struct inode *inode, sector_t block,
 688                              int *err, int *new)
 689 {
 690         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 691         struct extent_position prev_epos, cur_epos, next_epos;
 692         int count = 0, startnum = 0, endnum = 0;
 693         uint32_t elen = 0, tmpelen;
 694         struct kernel_lb_addr eloc, tmpeloc;
 695         int c = 1;
 696         loff_t lbcount = 0, b_off = 0;
 697         uint32_t newblocknum, newblock;
 698         sector_t offset = 0;
 699         int8_t etype;
 700         struct udf_inode_info *iinfo = UDF_I(inode);
 701         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 702         int lastblock = 0;
 703         bool isBeyondEOF;
 704
 705         *err = 0;
 706         *new = 0;
 707         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 708         prev_epos.block = iinfo->i_location;
 709         prev_epos.bh = NULL;
 710         cur_epos = next_epos = prev_epos;
 711         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 712
 713         /* find the extent which contains the block we are looking for.
 714            alternate between laarr[0] and laarr[1] for locations of the
 715            current extent, and the previous extent */
 716         do {
 717                 if (prev_epos.bh != cur_epos.bh) {
 718                         brelse(prev_epos.bh);
 719                         get_bh(cur_epos.bh);
 720                         prev_epos.bh = cur_epos.bh;
 721                 }
 722                 if (cur_epos.bh != next_epos.bh) {
 723                         brelse(cur_epos.bh);
 724                         get_bh(next_epos.bh);
 725                         cur_epos.bh = next_epos.bh;
 726                 }
 727
 728                 lbcount += elen;
 729
 730                 prev_epos.block = cur_epos.block;
 731                 cur_epos.block = next_epos.block;
 732
 733                 prev_epos.offset = cur_epos.offset;
 734                 cur_epos.offset = next_epos.offset;
 735
 736                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 737                 if (etype == -1)
 738                         break;
 739
 740                 c = !c;
 741
 742                 laarr[c].extLength = (etype << 30) | elen;
 743                 laarr[c].extLocation = eloc;
 744
 745                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 746                         pgoal = eloc.logicalBlockNum +
 747                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 748                                  inode->i_sb->s_blocksize_bits);
 749
 750                 count++;
 751         } while (lbcount + elen <= b_off);
 752
 753         b_off -= lbcount;
 754         offset = b_off >> inode->i_sb->s_blocksize_bits;
 755         /*
 756          * Move prev_epos and cur_epos into indirect extent if we are at
 757          * the pointer to it
 758          */
 759         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 760         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 761
 762         /* if the extent is allocated and recorded, return the block
 763            if the extent is not a multiple of the blocksize, round up */
 764
 765         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 766                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 767                         elen = EXT_RECORDED_ALLOCATED |
 768                                 ((elen + inode->i_sb->s_blocksize - 1) &
 769                                  ~(inode->i_sb->s_blocksize - 1));
 770                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 771                 }
 772                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 773                 goto out_free;
 774         }
 775
 776         /* Are we beyond EOF? */
 777         if (etype == -1) {
 778                 int ret;
 779                 loff_t hole_len;
 780                 isBeyondEOF = true;
 781                 if (count) {
 782                         if (c)
 783                                 laarr[0] = laarr[1];
 784                         startnum = 1;
 785                 } else {
 786                         /* Create a fake extent when there's not one */
 787                         memset(&laarr[0].extLocation, 0x00,
 788                                 sizeof(struct kernel_lb_addr));
 789                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 790                         /* Will udf_do_extend_file() create real extent from
 791                            a fake one? */
 792                         startnum = (offset > 0);
 793                 }
 794                 /* Create extents for the hole between EOF and offset */
 795                 hole_len = (loff_t)offset << inode->i_blkbits;
 796                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 797                 if (ret < 0) {
 798                         *err = ret;
 799                         newblock = 0;
 800                         goto out_free;
 801                 }
 802                 c = 0;
 803                 offset = 0;
 804                 count += ret;
 805                 /* We are not covered by a preallocated extent? */
 806                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 807                                                 EXT_NOT_RECORDED_ALLOCATED) {
 808                         /* Is there any real extent? - otherwise we overwrite
 809                          * the fake one... */
 810                         if (count)
 811                                 c = !c;
 812                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 813                                 inode->i_sb->s_blocksize;
 814                         memset(&laarr[c].extLocation, 0x00,
 815                                 sizeof(struct kernel_lb_addr));
 816                         count++;
 817                 }
 818                 endnum = c + 1;
 819                 lastblock = 1;
 820         } else {
 821                 isBeyondEOF = false;
 822                 endnum = startnum = ((count > 2) ? 2 : count);
 823
 824                 /* if the current extent is in position 0,
 825                    swap it with the previous */
 826                 if (!c && count != 1) {
 827                         laarr[2] = laarr[0];
 828                         laarr[0] = laarr[1];
 829                         laarr[1] = laarr[2];
 830                         c = 1;
 831                 }
 832
 833                 /* if the current block is located in an extent,
 834                    read the next extent */
 835                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 836                 if (etype != -1) {
 837                         laarr[c + 1].extLength = (etype << 30) | elen;
 838                         laarr[c + 1].extLocation = eloc;
 839                         count++;
 840                         startnum++;
 841                         endnum++;
 842                 } else
 843                         lastblock = 1;
 844         }
 845
 846         /* if the current extent is not recorded but allocated, get the
 847          * block in the extent corresponding to the requested block */
 848         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 849                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 850         else { /* otherwise, allocate a new block */
 851                 if (iinfo->i_next_alloc_block == block)
 852                         goal = iinfo->i_next_alloc_goal;
 853
 854                 if (!goal) {
 855                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 856                                 goal = iinfo->i_location.logicalBlockNum + 1;
 857                 }
 858
 859                 newblocknum = udf_new_block(inode->i_sb, inode,
 860                                 iinfo->i_location.partitionReferenceNum,
 861                                 goal, err);
 862                 if (!newblocknum) {
 863                         *err = -ENOSPC;
 864                         newblock = 0;
 865                         goto out_free;
 866                 }
 867                 if (isBeyondEOF)
 868                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 869         }
 870
 871         /* if the extent the requsted block is located in contains multiple
 872          * blocks, split the extent into at most three extents. blocks prior
 873          * to requested block, requested block, and blocks after requested
 874          * block */
 875         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 876
 877         /* We preallocate blocks only for regular files. It also makes sense
 878          * for directories but there's a problem when to drop the
 879          * preallocation. We might use some delayed work for that but I feel
 880          * it's overengineering for a filesystem like UDF. */
 881         if (S_ISREG(inode->i_mode))
 882                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 883
 884         /* merge any continuous blocks in laarr */
 885         udf_merge_extents(inode, laarr, &endnum);
 886
 887         /* write back the new extents, inserting new extents if the new number
 888          * of extents is greater than the old number, and deleting extents if
 889          * the new number of extents is less than the old number */
 890         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 891
 892         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 893                                 iinfo->i_location.partitionReferenceNum, 0);
 894         if (!newblock) {
 895                 *err = -EIO;
 896                 goto out_free;
 897         }
 898         *new = 1;
 899         iinfo->i_next_alloc_block = block;
 900         iinfo->i_next_alloc_goal = newblocknum;
 901         inode->i_ctime = current_time(inode);
 902
 903         if (IS_SYNC(inode))
 904                 udf_sync_inode(inode);
 905         else
 906                 mark_inode_dirty(inode);
 907 out_free:
 908         brelse(prev_epos.bh);
 909         brelse(cur_epos.bh);
 910         brelse(next_epos.bh);
 911         return newblock;
 912 }
 913
 914 static void udf_split_extents(struct inode *inode, int *c, int offset,
 915                               int newblocknum, struct kernel_long_ad *laarr,
 916                               int *endnum)
 917 {
 918         unsigned long blocksize = inode->i_sb->s_blocksize;
 919         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 920
 921         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 922             (laarr[*c].extLength >> 30) ==
 923                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 924                 int curr = *c;
 925                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 926                             blocksize - 1) >> blocksize_bits;
 927                 int8_t etype = (laarr[curr].extLength >> 30);
 928
 929                 if (blen == 1)
 930                         ;
 931                 else if (!offset || blen == offset + 1) {
 932                         laarr[curr + 2] = laarr[curr + 1];
 933                         laarr[curr + 1] = laarr[curr];
 934                 } else {
 935                         laarr[curr + 3] = laarr[curr + 1];
 936                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 937                 }
 938
 939                 if (offset) {
 940                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 941                                 udf_free_blocks(inode->i_sb, inode,
 942                                                 &laarr[curr].extLocation,
 943                                                 0, offset);
 944                                 laarr[curr].extLength =
 945                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 946                                         (offset << blocksize_bits);
 947                                 laarr[curr].extLocation.logicalBlockNum = 0;
 948                                 laarr[curr].extLocation.
 949                                                 partitionReferenceNum = 0;
 950                         } else
 951                                 laarr[curr].extLength = (etype << 30) |
 952                                         (offset << blocksize_bits);
 953                         curr++;
 954                         (*c)++;
 955                         (*endnum)++;
 956                 }
 957
 958                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 959                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 960                         laarr[curr].extLocation.partitionReferenceNum =
 961                                 UDF_I(inode)->i_location.partitionReferenceNum;
 962                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 963                         blocksize;
 964                 curr++;
 965
 966                 if (blen != offset + 1) {
 967                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 968                                 laarr[curr].extLocation.logicalBlockNum +=
 969                                                                 offset + 1;
 970                         laarr[curr].extLength = (etype << 30) |
 971                                 ((blen - (offset + 1)) << blocksize_bits);
 972                         curr++;
 973                         (*endnum)++;
 974                 }
 975         }
 976 }
 977
 978 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 979                                  struct kernel_long_ad *laarr,
 980                                  int *endnum)
 981 {
 982         int start, length = 0, currlength = 0, i;
 983
 984         if (*endnum >= (c + 1)) {
 985                 if (!lastblock)
 986                         return;
 987                 else
 988                         start = c;
 989         } else {
 990                 if ((laarr[c + 1].extLength >> 30) ==
 991                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 992                         start = c + 1;
 993                         length = currlength =
 994                                 (((laarr[c + 1].extLength &
 995                                         UDF_EXTENT_LENGTH_MASK) +
 996                                 inode->i_sb->s_blocksize - 1) >>
 997                                 inode->i_sb->s_blocksize_bits);
 998                 } else
 999                         start = c;
1000         }
1001
1002         for (i = start + 1; i <= *endnum; i++) {
1003                 if (i == *endnum) {
1004                         if (lastblock)
1005                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1006                 } else if ((laarr[i].extLength >> 30) ==
1007                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1008                         length += (((laarr[i].extLength &
1009                                                 UDF_EXTENT_LENGTH_MASK) +
1010                                     inode->i_sb->s_blocksize - 1) >>
1011                                     inode->i_sb->s_blocksize_bits);
1012                 } else
1013                         break;
1014         }
1015
1016         if (length) {
1017                 int next = laarr[start].extLocation.logicalBlockNum +
1018                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1019                           inode->i_sb->s_blocksize - 1) >>
1020                           inode->i_sb->s_blocksize_bits);
1021                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1022                                 laarr[start].extLocation.partitionReferenceNum,
1023                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1024                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1025                                 currlength);
1026                 if (numalloc)   {
1027                         if (start == (c + 1))
1028                                 laarr[start].extLength +=
1029                                         (numalloc <<
1030                                          inode->i_sb->s_blocksize_bits);
1031                         else {
1032                                 memmove(&laarr[c + 2], &laarr[c + 1],
1033                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1034                                 (*endnum)++;
1035                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1036                                 laarr[c + 1].extLocation.partitionReferenceNum =
1037                                         laarr[c].extLocation.
1038                                                         partitionReferenceNum;
1039                                 laarr[c + 1].extLength =
1040                                         EXT_NOT_RECORDED_ALLOCATED |
1041                                         (numalloc <<
1042                                          inode->i_sb->s_blocksize_bits);
1043                                 start = c + 1;
1044                         }
1045
1046                         for (i = start + 1; numalloc && i < *endnum; i++) {
1047                                 int elen = ((laarr[i].extLength &
1048                                                 UDF_EXTENT_LENGTH_MASK) +
1049                                             inode->i_sb->s_blocksize - 1) >>
1050                                             inode->i_sb->s_blocksize_bits;
1051
1052                                 if (elen > numalloc) {
1053                                         laarr[i].extLength -=
1054                                                 (numalloc <<
1055                                                  inode->i_sb->s_blocksize_bits);
1056                                         numalloc = 0;
1057                                 } else {
1058                                         numalloc -= elen;
1059                                         if (*endnum > (i + 1))
1060                                                 memmove(&laarr[i],
1061                                                         &laarr[i + 1],
1062                                                         sizeof(struct long_ad) *
1063                                                         (*endnum - (i + 1)));
1064                                         i--;
1065                                         (*endnum)--;
1066                                 }
1067                         }
1068                         UDF_I(inode)->i_lenExtents +=
1069                                 numalloc << inode->i_sb->s_blocksize_bits;
1070                 }
1071         }
1072 }
1073
1074 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1075                               int *endnum)
1076 {
1077         int i;
1078         unsigned long blocksize = inode->i_sb->s_blocksize;
1079         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1080
1081         for (i = 0; i < (*endnum - 1); i++) {
1082                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1083                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1084
1085                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1086                         (((li->extLength >> 30) ==
1087                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1088                         ((lip1->extLocation.logicalBlockNum -
1089                           li->extLocation.logicalBlockNum) ==
1090                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1091                         blocksize - 1) >> blocksize_bits)))) {
1092
1093                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1094                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1095                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1096                                 lip1->extLength = (lip1->extLength -
1097                                                   (li->extLength &
1098                                                    UDF_EXTENT_LENGTH_MASK) +
1099                                                    UDF_EXTENT_LENGTH_MASK) &
1100                                                         ~(blocksize - 1);
1101                                 li->extLength = (li->extLength &
1102                                                  UDF_EXTENT_FLAG_MASK) +
1103                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1104                                                 blocksize;
1105                                 lip1->extLocation.logicalBlockNum =
1106                                         li->extLocation.logicalBlockNum +
1107                                         ((li->extLength &
1108                                                 UDF_EXTENT_LENGTH_MASK) >>
1109                                                 blocksize_bits);
1110                         } else {
1111                                 li->extLength = lip1->extLength +
1112                                         (((li->extLength &
1113                                                 UDF_EXTENT_LENGTH_MASK) +
1114                                          blocksize - 1) & ~(blocksize - 1));
1115                                 if (*endnum > (i + 2))
1116                                         memmove(&laarr[i + 1], &laarr[i + 2],
1117                                                 sizeof(struct long_ad) *
1118                                                 (*endnum - (i + 2)));
1119                                 i--;
1120                                 (*endnum)--;
1121                         }
1122                 } else if (((li->extLength >> 30) ==
1123                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1124                            ((lip1->extLength >> 30) ==
1125                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1126                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1127                                         ((li->extLength &
1128                                           UDF_EXTENT_LENGTH_MASK) +
1129                                          blocksize - 1) >> blocksize_bits);
1130                         li->extLocation.logicalBlockNum = 0;
1131                         li->extLocation.partitionReferenceNum = 0;
1132
1133                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1134                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1135                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1136                                 lip1->extLength = (lip1->extLength -
1137                                                    (li->extLength &
1138                                                    UDF_EXTENT_LENGTH_MASK) +
1139                                                    UDF_EXTENT_LENGTH_MASK) &
1140                                                    ~(blocksize - 1);
1141                                 li->extLength = (li->extLength &
1142                                                  UDF_EXTENT_FLAG_MASK) +
1143                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1144                                                 blocksize;
1145                         } else {
1146                                 li->extLength = lip1->extLength +
1147                                         (((li->extLength &
1148                                                 UDF_EXTENT_LENGTH_MASK) +
1149                                           blocksize - 1) & ~(blocksize - 1));
1150                                 if (*endnum > (i + 2))
1151                                         memmove(&laarr[i + 1], &laarr[i + 2],
1152                                                 sizeof(struct long_ad) *
1153                                                 (*endnum - (i + 2)));
1154                                 i--;
1155                                 (*endnum)--;
1156                         }
1157                 } else if ((li->extLength >> 30) ==
1158                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1159                         udf_free_blocks(inode->i_sb, inode,
1160                                         &li->extLocation, 0,
1161                                         ((li->extLength &
1162                                                 UDF_EXTENT_LENGTH_MASK) +
1163                                          blocksize - 1) >> blocksize_bits);
1164                         li->extLocation.logicalBlockNum = 0;
1165                         li->extLocation.partitionReferenceNum = 0;
1166                         li->extLength = (li->extLength &
1167                                                 UDF_EXTENT_LENGTH_MASK) |
1168                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1169                 }
1170         }
1171 }
1172
1173 static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1174                                int startnum, int endnum,
1175                                struct extent_position *epos)
1176 {
1177         int start = 0, i;
1178         struct kernel_lb_addr tmploc;
1179         uint32_t tmplen;
1180
1181         if (startnum > endnum) {
1182                 for (i = 0; i < (startnum - endnum); i++)
1183                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1184                                         laarr[i].extLength);
1185         } else if (startnum < endnum) {
1186                 for (i = 0; i < (endnum - startnum); i++) {
1187                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1188                                         laarr[i].extLength);
1189                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1190                                       &laarr[i].extLength, 1);
1191                         start++;
1192                 }
1193         }
1194
1195         for (i = start; i < endnum; i++) {
1196                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1197                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1198                                laarr[i].extLength, 1);
1199         }
1200 }
1201
1202 struct buffer_head *udf_bread(struct inode *inode, int block,
1203                               int create, int *err)
1204 {
1205         struct buffer_head *bh = NULL;
1206
1207         bh = udf_getblk(inode, block, create, err);
1208         if (!bh)
1209                 return NULL;
1210
1211         if (buffer_uptodate(bh))
1212                 return bh;
1213
1214         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1215
1216         wait_on_buffer(bh);
1217         if (buffer_uptodate(bh))
1218                 return bh;
1219
1220         brelse(bh);
1221         *err = -EIO;
1222         return NULL;
1223 }
1224
1225 int udf_setsize(struct inode *inode, loff_t newsize)
1226 {
1227         int err;
1228         struct udf_inode_info *iinfo;
1229         int bsize = i_blocksize(inode);
1230
1231         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1232               S_ISLNK(inode->i_mode)))
1233                 return -EINVAL;
1234         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1235                 return -EPERM;
1236
1237         iinfo = UDF_I(inode);
1238         if (newsize > inode->i_size) {
1239                 down_write(&iinfo->i_data_sem);
1240                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1241                         if (bsize <
1242                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1243                                 err = udf_expand_file_adinicb(inode);
1244                                 if (err)
1245                                         return err;
1246                                 down_write(&iinfo->i_data_sem);
1247                         } else {
1248                                 iinfo->i_lenAlloc = newsize;
1249                                 goto set_size;
1250                         }
1251                 }
1252                 err = udf_extend_file(inode, newsize);
1253                 if (err) {
1254                         up_write(&iinfo->i_data_sem);
1255                         return err;
1256                 }
1257 set_size:
1258                 up_write(&iinfo->i_data_sem);
1259                 truncate_setsize(inode, newsize);
1260         } else {
1261                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1262                         down_write(&iinfo->i_data_sem);
1263                         udf_clear_extent_cache(inode);
1264                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1265                                0x00, bsize - newsize -
1266                                udf_file_entry_alloc_offset(inode));
1267                         iinfo->i_lenAlloc = newsize;
1268                         truncate_setsize(inode, newsize);
1269                         up_write(&iinfo->i_data_sem);
1270                         goto update_time;
1271                 }
1272                 err = block_truncate_page(inode->i_mapping, newsize,
1273                                           udf_get_block);
1274                 if (err)
1275                         return err;
1276                 truncate_setsize(inode, newsize);
1277                 down_write(&iinfo->i_data_sem);
1278                 udf_clear_extent_cache(inode);
1279                 udf_truncate_extents(inode);
1280                 up_write(&iinfo->i_data_sem);
1281         }
1282 update_time:
1283         inode->i_mtime = inode->i_ctime = current_time(inode);
1284         if (IS_SYNC(inode))
1285                 udf_sync_inode(inode);
1286         else
1287                 mark_inode_dirty(inode);
1288         return 0;
1289 }
1290
1291 /*
1292  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1293  * arbitrary - just that we hopefully don't limit any real use of rewritten
1294  * inode on write-once media but avoid looping for too long on corrupted media.
1295  */
1296 #define UDF_MAX_ICB_NESTING 1024
1297
1298 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1299 {
1300         struct buffer_head *bh = NULL;
1301         struct fileEntry *fe;
1302         struct extendedFileEntry *efe;
1303         uint16_t ident;
1304         struct udf_inode_info *iinfo = UDF_I(inode);
1305         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1306         struct kernel_lb_addr *iloc = &iinfo->i_location;
1307         unsigned int link_count;
1308         unsigned int indirections = 0;
1309         int bs = inode->i_sb->s_blocksize;
1310         int ret = -EIO;
1311
1312 reread:
1313         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1314                 udf_debug("partition reference: %d > logical volume partitions: %d\n",
1315                           iloc->partitionReferenceNum, sbi->s_partitions);
1316                 return -EIO;
1317         }
1318
1319         if (iloc->logicalBlockNum >=
1320             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1321                 udf_debug("block=%d, partition=%d out of range\n",
1322                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1323                 return -EIO;
1324         }
1325
1326         /*
1327          * Set defaults, but the inode is still incomplete!
1328          * Note: get_new_inode() sets the following on a new inode:
1329          *      i_sb = sb
1330          *      i_no = ino
1331          *      i_flags = sb->s_flags
1332          *      i_state = 0
1333          * clean_inode(): zero fills and sets
1334          *      i_count = 1
1335          *      i_nlink = 1
1336          *      i_op = NULL;
1337          */
1338         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1339         if (!bh) {
1340                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1341                 return -EIO;
1342         }
1343
1344         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1345             ident != TAG_IDENT_USE) {
1346                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1347                         inode->i_ino, ident);
1348                 goto out;
1349         }
1350
1351         fe = (struct fileEntry *)bh->b_data;
1352         efe = (struct extendedFileEntry *)bh->b_data;
1353
1354         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1355                 struct buffer_head *ibh;
1356
1357                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1358                 if (ident == TAG_IDENT_IE && ibh) {
1359                         struct kernel_lb_addr loc;
1360                         struct indirectEntry *ie;
1361
1362                         ie = (struct indirectEntry *)ibh->b_data;
1363                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1364
1365                         if (ie->indirectICB.extLength) {
1366                                 brelse(ibh);
1367                                 memcpy(&iinfo->i_location, &loc,
1368                                        sizeof(struct kernel_lb_addr));
1369                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1370                                         udf_err(inode->i_sb,
1371                                                 "too many ICBs in ICB hierarchy"
1372                                                 " (max %d supported)\n",
1373                                                 UDF_MAX_ICB_NESTING);
1374                                         goto out;
1375                                 }
1376                                 brelse(bh);
1377                                 goto reread;
1378                         }
1379                 }
1380                 brelse(ibh);
1381         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1382                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1383                         le16_to_cpu(fe->icbTag.strategyType));
1384                 goto out;
1385         }
1386         if (fe->icbTag.strategyType == cpu_to_le16(4))
1387                 iinfo->i_strat4096 = 0;
1388         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1389                 iinfo->i_strat4096 = 1;
1390
1391         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1392                                                         ICBTAG_FLAG_AD_MASK;
1393         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1394             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1395             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1396                 ret = -EIO;
1397                 goto out;
1398         }
1399         iinfo->i_unique = 0;
1400         iinfo->i_lenEAttr = 0;
1401         iinfo->i_lenExtents = 0;
1402         iinfo->i_lenAlloc = 0;
1403         iinfo->i_next_alloc_block = 0;
1404         iinfo->i_next_alloc_goal = 0;
1405         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1406                 iinfo->i_efe = 1;
1407                 iinfo->i_use = 0;
1408                 ret = udf_alloc_i_data(inode, bs -
1409                                         sizeof(struct extendedFileEntry));
1410                 if (ret)
1411                         goto out;
1412                 memcpy(iinfo->i_ext.i_data,
1413                        bh->b_data + sizeof(struct extendedFileEntry),
1414                        bs - sizeof(struct extendedFileEntry));
1415         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1416                 iinfo->i_efe = 0;
1417                 iinfo->i_use = 0;
1418                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1419                 if (ret)
1420                         goto out;
1421                 memcpy(iinfo->i_ext.i_data,
1422                        bh->b_data + sizeof(struct fileEntry),
1423                        bs - sizeof(struct fileEntry));
1424         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1425                 iinfo->i_efe = 0;
1426                 iinfo->i_use = 1;
1427                 iinfo->i_lenAlloc = le32_to_cpu(
1428                                 ((struct unallocSpaceEntry *)bh->b_data)->
1429                                  lengthAllocDescs);
1430                 ret = udf_alloc_i_data(inode, bs -
1431                                         sizeof(struct unallocSpaceEntry));
1432                 if (ret)
1433                         goto out;
1434                 memcpy(iinfo->i_ext.i_data,
1435                        bh->b_data + sizeof(struct unallocSpaceEntry),
1436                        bs - sizeof(struct unallocSpaceEntry));
1437                 return 0;
1438         }
1439
1440         ret = -EIO;
1441         read_lock(&sbi->s_cred_lock);
1442         i_uid_write(inode, le32_to_cpu(fe->uid));
1443         if (!uid_valid(inode->i_uid) ||
1444             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1445             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1446                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1447
1448         i_gid_write(inode, le32_to_cpu(fe->gid));
1449         if (!gid_valid(inode->i_gid) ||
1450             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1451             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1452                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1453
1454         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1455                         sbi->s_fmode != UDF_INVALID_MODE)
1456                 inode->i_mode = sbi->s_fmode;
1457         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1458                         sbi->s_dmode != UDF_INVALID_MODE)
1459                 inode->i_mode = sbi->s_dmode;
1460         else
1461                 inode->i_mode = udf_convert_permissions(fe);
1462         inode->i_mode &= ~sbi->s_umask;
1463         read_unlock(&sbi->s_cred_lock);
1464
1465         link_count = le16_to_cpu(fe->fileLinkCount);
1466         if (!link_count) {
1467                 if (!hidden_inode) {
1468                         ret = -ESTALE;
1469                         goto out;
1470                 }
1471                 link_count = 1;
1472         }
1473         set_nlink(inode, link_count);
1474
1475         inode->i_size = le64_to_cpu(fe->informationLength);
1476         iinfo->i_lenExtents = inode->i_size;
1477
1478         if (iinfo->i_efe == 0) {
1479                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1480                         (inode->i_sb->s_blocksize_bits - 9);
1481
1482                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1483                         inode->i_atime = sbi->s_record_time;
1484
1485                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1486                                             fe->modificationTime))
1487                         inode->i_mtime = sbi->s_record_time;
1488
1489                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1490                         inode->i_ctime = sbi->s_record_time;
1491
1492                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1493                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1494                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1495                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1496         } else {
1497                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1498                     (inode->i_sb->s_blocksize_bits - 9);
1499
1500                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1501                         inode->i_atime = sbi->s_record_time;
1502
1503                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1504                                             efe->modificationTime))
1505                         inode->i_mtime = sbi->s_record_time;
1506
1507                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1508                         iinfo->i_crtime = sbi->s_record_time;
1509
1510                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1511                         inode->i_ctime = sbi->s_record_time;
1512
1513                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1514                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1515                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1516                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1517         }
1518         inode->i_generation = iinfo->i_unique;
1519
1520         /*
1521          * Sanity check length of allocation descriptors and extended attrs to
1522          * avoid integer overflows
1523          */
1524         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1525                 goto out;
1526         /* Now do exact checks */
1527         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1528                 goto out;
1529         /* Sanity checks for files in ICB so that we don't get confused later */
1530         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1531                 /*
1532                  * For file in ICB data is stored in allocation descriptor
1533                  * so sizes should match
1534                  */
1535                 if (iinfo->i_lenAlloc != inode->i_size)
1536                         goto out;
1537                 /* File in ICB has to fit in there... */
1538                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1539                         goto out;
1540         }
1541
1542         switch (fe->icbTag.fileType) {
1543         case ICBTAG_FILE_TYPE_DIRECTORY:
1544                 inode->i_op = &udf_dir_inode_operations;
1545                 inode->i_fop = &udf_dir_operations;
1546                 inode->i_mode |= S_IFDIR;
1547                 inc_nlink(inode);
1548                 break;
1549         case ICBTAG_FILE_TYPE_REALTIME:
1550         case ICBTAG_FILE_TYPE_REGULAR:
1551         case ICBTAG_FILE_TYPE_UNDEF:
1552         case ICBTAG_FILE_TYPE_VAT20:
1553                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1554                         inode->i_data.a_ops = &udf_adinicb_aops;
1555                 else
1556                         inode->i_data.a_ops = &udf_aops;
1557                 inode->i_op = &udf_file_inode_operations;
1558                 inode->i_fop = &udf_file_operations;
1559                 inode->i_mode |= S_IFREG;
1560                 break;
1561         case ICBTAG_FILE_TYPE_BLOCK:
1562                 inode->i_mode |= S_IFBLK;
1563                 break;
1564         case ICBTAG_FILE_TYPE_CHAR:
1565                 inode->i_mode |= S_IFCHR;
1566                 break;
1567         case ICBTAG_FILE_TYPE_FIFO:
1568                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1569                 break;
1570         case ICBTAG_FILE_TYPE_SOCKET:
1571                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1572                 break;
1573         case ICBTAG_FILE_TYPE_SYMLINK:
1574                 inode->i_data.a_ops = &udf_symlink_aops;
1575                 inode->i_op = &udf_symlink_inode_operations;
1576                 inode_nohighmem(inode);
1577                 inode->i_mode = S_IFLNK | 0777;
1578                 break;
1579         case ICBTAG_FILE_TYPE_MAIN:
1580                 udf_debug("METADATA FILE-----\n");
1581                 break;
1582         case ICBTAG_FILE_TYPE_MIRROR:
1583                 udf_debug("METADATA MIRROR FILE-----\n");
1584                 break;
1585         case ICBTAG_FILE_TYPE_BITMAP:
1586                 udf_debug("METADATA BITMAP FILE-----\n");
1587                 break;
1588         default:
1589                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1590                         inode->i_ino, fe->icbTag.fileType);
1591                 goto out;
1592         }
1593         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1594                 struct deviceSpec *dsea =
1595                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1596                 if (dsea) {
1597                         init_special_inode(inode, inode->i_mode,
1598                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1599                                       le32_to_cpu(dsea->minorDeviceIdent)));
1600                         /* Developer ID ??? */
1601                 } else
1602                         goto out;
1603         }
1604         ret = 0;
1605 out:
1606         brelse(bh);
1607         return ret;
1608 }
1609
1610 static int udf_alloc_i_data(struct inode *inode, size_t size)
1611 {
1612         struct udf_inode_info *iinfo = UDF_I(inode);
1613         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1614         if (!iinfo->i_ext.i_data)
1615                 return -ENOMEM;
1616         return 0;
1617 }
1618
1619 static umode_t udf_convert_permissions(struct fileEntry *fe)
1620 {
1621         umode_t mode;
1622         uint32_t permissions;
1623         uint32_t flags;
1624
1625         permissions = le32_to_cpu(fe->permissions);
1626         flags = le16_to_cpu(fe->icbTag.flags);
1627
1628         mode =  ((permissions) & 0007) |
1629                 ((permissions >> 2) & 0070) |
1630                 ((permissions >> 4) & 0700) |
1631                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1632                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1633                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1634
1635         return mode;
1636 }
1637
1638 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1639 {
1640         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1641 }
1642
1643 static int udf_sync_inode(struct inode *inode)
1644 {
1645         return udf_update_inode(inode, 1);
1646 }
1647
1648 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec time)
1649 {
1650         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1651             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1652              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1653                 iinfo->i_crtime = time;
1654 }
1655
1656 static int udf_update_inode(struct inode *inode, int do_sync)
1657 {
1658         struct buffer_head *bh = NULL;
1659         struct fileEntry *fe;
1660         struct extendedFileEntry *efe;
1661         uint64_t lb_recorded;
1662         uint32_t udfperms;
1663         uint16_t icbflags;
1664         uint16_t crclen;
1665         int err = 0;
1666         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1667         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1668         struct udf_inode_info *iinfo = UDF_I(inode);
1669
1670         bh = udf_tgetblk(inode->i_sb,
1671                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1672         if (!bh) {
1673                 udf_debug("getblk failure\n");
1674                 return -EIO;
1675         }
1676
1677         lock_buffer(bh);
1678         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1679         fe = (struct fileEntry *)bh->b_data;
1680         efe = (struct extendedFileEntry *)bh->b_data;
1681
1682         if (iinfo->i_use) {
1683                 struct unallocSpaceEntry *use =
1684                         (struct unallocSpaceEntry *)bh->b_data;
1685
1686                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1687                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1688                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1689                                         sizeof(struct unallocSpaceEntry));
1690                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1691                 crclen = sizeof(struct unallocSpaceEntry);
1692
1693                 goto finish;
1694         }
1695
1696         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1697                 fe->uid = cpu_to_le32(-1);
1698         else
1699                 fe->uid = cpu_to_le32(i_uid_read(inode));
1700
1701         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1702                 fe->gid = cpu_to_le32(-1);
1703         else
1704                 fe->gid = cpu_to_le32(i_gid_read(inode));
1705
1706         udfperms = ((inode->i_mode & 0007)) |
1707                    ((inode->i_mode & 0070) << 2) |
1708                    ((inode->i_mode & 0700) << 4);
1709
1710         udfperms |= (le32_to_cpu(fe->permissions) &
1711                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1712                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1713                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1714         fe->permissions = cpu_to_le32(udfperms);
1715
1716         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1717                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1718         else
1719                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1720
1721         fe->informationLength = cpu_to_le64(inode->i_size);
1722
1723         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1724                 struct regid *eid;
1725                 struct deviceSpec *dsea =
1726                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1727                 if (!dsea) {
1728                         dsea = (struct deviceSpec *)
1729                                 udf_add_extendedattr(inode,
1730                                                      sizeof(struct deviceSpec) +
1731                                                      sizeof(struct regid), 12, 0x3);
1732                         dsea->attrType = cpu_to_le32(12);
1733                         dsea->attrSubtype = 1;
1734                         dsea->attrLength = cpu_to_le32(
1735                                                 sizeof(struct deviceSpec) +
1736                                                 sizeof(struct regid));
1737                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1738                 }
1739                 eid = (struct regid *)dsea->impUse;
1740                 memset(eid, 0, sizeof(*eid));
1741                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1742                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1743                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1744                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1745                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1746         }
1747
1748         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1749                 lb_recorded = 0; /* No extents => no blocks! */
1750         else
1751                 lb_recorded =
1752                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1753                         (blocksize_bits - 9);
1754
1755         if (iinfo->i_efe == 0) {
1756                 memcpy(bh->b_data + sizeof(struct fileEntry),
1757                        iinfo->i_ext.i_data,
1758                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1759                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1760
1761                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1762                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1763                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1764                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1765                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1766                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1767                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1768                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1769                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1770                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1771                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1772                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1773                 crclen = sizeof(struct fileEntry);
1774         } else {
1775                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1776                        iinfo->i_ext.i_data,
1777                        inode->i_sb->s_blocksize -
1778                                         sizeof(struct extendedFileEntry));
1779                 efe->objectSize = cpu_to_le64(inode->i_size);
1780                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1781
1782                 udf_adjust_time(iinfo, inode->i_atime);
1783                 udf_adjust_time(iinfo, inode->i_mtime);
1784                 udf_adjust_time(iinfo, inode->i_ctime);
1785
1786                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1787                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1788                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1789                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1790
1791                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1792                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1793                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1794                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1795                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1796                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1797                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1798                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1799                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1800                 crclen = sizeof(struct extendedFileEntry);
1801         }
1802
1803 finish:
1804         if (iinfo->i_strat4096) {
1805                 fe->icbTag.strategyType = cpu_to_le16(4096);
1806                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1807                 fe->icbTag.numEntries = cpu_to_le16(2);
1808         } else {
1809                 fe->icbTag.strategyType = cpu_to_le16(4);
1810                 fe->icbTag.numEntries = cpu_to_le16(1);
1811         }
1812
1813         if (iinfo->i_use)
1814                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1815         else if (S_ISDIR(inode->i_mode))
1816                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1817         else if (S_ISREG(inode->i_mode))
1818                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1819         else if (S_ISLNK(inode->i_mode))
1820                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1821         else if (S_ISBLK(inode->i_mode))
1822                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1823         else if (S_ISCHR(inode->i_mode))
1824                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1825         else if (S_ISFIFO(inode->i_mode))
1826                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1827         else if (S_ISSOCK(inode->i_mode))
1828                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1829
1830         icbflags =      iinfo->i_alloc_type |
1831                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1832                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1833                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1834                         (le16_to_cpu(fe->icbTag.flags) &
1835                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1836                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1837
1838         fe->icbTag.flags = cpu_to_le16(icbflags);
1839         if (sbi->s_udfrev >= 0x0200)
1840                 fe->descTag.descVersion = cpu_to_le16(3);
1841         else
1842                 fe->descTag.descVersion = cpu_to_le16(2);
1843         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1844         fe->descTag.tagLocation = cpu_to_le32(
1845                                         iinfo->i_location.logicalBlockNum);
1846         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1847         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1848         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1849                                                   crclen));
1850         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1851
1852         set_buffer_uptodate(bh);
1853         unlock_buffer(bh);
1854
1855         /* write the data blocks */
1856         mark_buffer_dirty(bh);
1857         if (do_sync) {
1858                 sync_dirty_buffer(bh);
1859                 if (buffer_write_io_error(bh)) {
1860                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1861                                  inode->i_ino);
1862                         err = -EIO;
1863                 }
1864         }
1865         brelse(bh);
1866
1867         return err;
1868 }
1869
1870 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1871                          bool hidden_inode)
1872 {
1873         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1874         struct inode *inode = iget_locked(sb, block);
1875         int err;
1876
1877         if (!inode)
1878                 return ERR_PTR(-ENOMEM);
1879
1880         if (!(inode->i_state & I_NEW))
1881                 return inode;
1882
1883         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1884         err = udf_read_inode(inode, hidden_inode);
1885         if (err < 0) {
1886                 iget_failed(inode);
1887                 return ERR_PTR(err);
1888         }
1889         unlock_new_inode(inode);
1890
1891         return inode;
1892 }
1893
1894 int udf_setup_indirect_aext(struct inode *inode, int block,
1895                             struct extent_position *epos)
1896 {
1897         struct super_block *sb = inode->i_sb;
1898         struct buffer_head *bh;
1899         struct allocExtDesc *aed;
1900         struct extent_position nepos;
1901         struct kernel_lb_addr neloc;
1902         int ver, adsize;
1903
1904         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1905                 adsize = sizeof(struct short_ad);
1906         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1907                 adsize = sizeof(struct long_ad);
1908         else
1909                 return -EIO;
1910
1911         neloc.logicalBlockNum = block;
1912         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1913
1914         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1915         if (!bh)
1916                 return -EIO;
1917         lock_buffer(bh);
1918         memset(bh->b_data, 0x00, sb->s_blocksize);
1919         set_buffer_uptodate(bh);
1920         unlock_buffer(bh);
1921         mark_buffer_dirty_inode(bh, inode);
1922
1923         aed = (struct allocExtDesc *)(bh->b_data);
1924         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1925                 aed->previousAllocExtLocation =
1926                                 cpu_to_le32(epos->block.logicalBlockNum);
1927         }
1928         aed->lengthAllocDescs = cpu_to_le32(0);
1929         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1930                 ver = 3;
1931         else
1932                 ver = 2;
1933         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1934                     sizeof(struct tag));
1935
1936         nepos.block = neloc;
1937         nepos.offset = sizeof(struct allocExtDesc);
1938         nepos.bh = bh;
1939
1940         /*
1941          * Do we have to copy current last extent to make space for indirect
1942          * one?
1943          */
1944         if (epos->offset + adsize > sb->s_blocksize) {
1945                 struct kernel_lb_addr cp_loc;
1946                 uint32_t cp_len;
1947                 int cp_type;
1948
1949                 epos->offset -= adsize;
1950                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1951                 cp_len |= ((uint32_t)cp_type) << 30;
1952
1953                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1954                 udf_write_aext(inode, epos, &nepos.block,
1955                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1956         } else {
1957                 __udf_add_aext(inode, epos, &nepos.block,
1958                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1959         }
1960
1961         brelse(epos->bh);
1962         *epos = nepos;
1963
1964         return 0;
1965 }
1966
1967 /*
1968  * Append extent at the given position - should be the first free one in inode
1969  * / indirect extent. This function assumes there is enough space in the inode
1970  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1971  */
1972 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1973                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1974 {
1975         struct udf_inode_info *iinfo = UDF_I(inode);
1976         struct allocExtDesc *aed;
1977         int adsize;
1978
1979         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1980                 adsize = sizeof(struct short_ad);
1981         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1982                 adsize = sizeof(struct long_ad);
1983         else
1984                 return -EIO;
1985
1986         if (!epos->bh) {
1987                 WARN_ON(iinfo->i_lenAlloc !=
1988                         epos->offset - udf_file_entry_alloc_offset(inode));
1989         } else {
1990                 aed = (struct allocExtDesc *)epos->bh->b_data;
1991                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
1992                         epos->offset - sizeof(struct allocExtDesc));
1993                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1994         }
1995
1996         udf_write_aext(inode, epos, eloc, elen, inc);
1997
1998         if (!epos->bh) {
1999                 iinfo->i_lenAlloc += adsize;
2000                 mark_inode_dirty(inode);
2001         } else {
2002                 aed = (struct allocExtDesc *)epos->bh->b_data;
2003                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2004                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2005                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2006                         udf_update_tag(epos->bh->b_data,
2007                                         epos->offset + (inc ? 0 : adsize));
2008                 else
2009                         udf_update_tag(epos->bh->b_data,
2010                                         sizeof(struct allocExtDesc));
2011                 mark_buffer_dirty_inode(epos->bh, inode);
2012         }
2013
2014         return 0;
2015 }
2016
2017 /*
2018  * Append extent at given position - should be the first free one in inode
2019  * / indirect extent. Takes care of allocating and linking indirect blocks.
2020  */
2021 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2022                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2023 {
2024         int adsize;
2025         struct super_block *sb = inode->i_sb;
2026
2027         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2028                 adsize = sizeof(struct short_ad);
2029         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2030                 adsize = sizeof(struct long_ad);
2031         else
2032                 return -EIO;
2033
2034         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2035                 int err;
2036                 int new_block;
2037
2038                 new_block = udf_new_block(sb, NULL,
2039                                           epos->block.partitionReferenceNum,
2040                                           epos->block.logicalBlockNum, &err);
2041                 if (!new_block)
2042                         return -ENOSPC;
2043
2044                 err = udf_setup_indirect_aext(inode, new_block, epos);
2045                 if (err)
2046                         return err;
2047         }
2048
2049         return __udf_add_aext(inode, epos, eloc, elen, inc);
2050 }
2051
2052 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2053                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2054 {
2055         int adsize;
2056         uint8_t *ptr;
2057         struct short_ad *sad;
2058         struct long_ad *lad;
2059         struct udf_inode_info *iinfo = UDF_I(inode);
2060
2061         if (!epos->bh)
2062                 ptr = iinfo->i_ext.i_data + epos->offset -
2063                         udf_file_entry_alloc_offset(inode) +
2064                         iinfo->i_lenEAttr;
2065         else
2066                 ptr = epos->bh->b_data + epos->offset;
2067
2068         switch (iinfo->i_alloc_type) {
2069         case ICBTAG_FLAG_AD_SHORT:
2070                 sad = (struct short_ad *)ptr;
2071                 sad->extLength = cpu_to_le32(elen);
2072                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2073                 adsize = sizeof(struct short_ad);
2074                 break;
2075         case ICBTAG_FLAG_AD_LONG:
2076                 lad = (struct long_ad *)ptr;
2077                 lad->extLength = cpu_to_le32(elen);
2078                 lad->extLocation = cpu_to_lelb(*eloc);
2079                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2080                 adsize = sizeof(struct long_ad);
2081                 break;
2082         default:
2083                 return;
2084         }
2085
2086         if (epos->bh) {
2087                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2088                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2089                         struct allocExtDesc *aed =
2090                                 (struct allocExtDesc *)epos->bh->b_data;
2091                         udf_update_tag(epos->bh->b_data,
2092                                        le32_to_cpu(aed->lengthAllocDescs) +
2093                                        sizeof(struct allocExtDesc));
2094                 }
2095                 mark_buffer_dirty_inode(epos->bh, inode);
2096         } else {
2097                 mark_inode_dirty(inode);
2098         }
2099
2100         if (inc)
2101                 epos->offset += adsize;
2102 }
2103
2104 /*
2105  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2106  * someone does some weird stuff.
2107  */
2108 #define UDF_MAX_INDIR_EXTS 16
2109
2110 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2111                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2112 {
2113         int8_t etype;
2114         unsigned int indirections = 0;
2115
2116         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2117                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2118                 int block;
2119
2120                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2121                         udf_err(inode->i_sb,
2122                                 "too many indirect extents in inode %lu\n",
2123                                 inode->i_ino);
2124                         return -1;
2125                 }
2126
2127                 epos->block = *eloc;
2128                 epos->offset = sizeof(struct allocExtDesc);
2129                 brelse(epos->bh);
2130                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2131                 epos->bh = udf_tread(inode->i_sb, block);
2132                 if (!epos->bh) {
2133                         udf_debug("reading block %d failed!\n", block);
2134                         return -1;
2135                 }
2136         }
2137
2138         return etype;
2139 }
2140
2141 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2142                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2143 {
2144         int alen;
2145         int8_t etype;
2146         uint8_t *ptr;
2147         struct short_ad *sad;
2148         struct long_ad *lad;
2149         struct udf_inode_info *iinfo = UDF_I(inode);
2150
2151         if (!epos->bh) {
2152                 if (!epos->offset)
2153                         epos->offset = udf_file_entry_alloc_offset(inode);
2154                 ptr = iinfo->i_ext.i_data + epos->offset -
2155                         udf_file_entry_alloc_offset(inode) +
2156                         iinfo->i_lenEAttr;
2157                 alen = udf_file_entry_alloc_offset(inode) +
2158                                                         iinfo->i_lenAlloc;
2159         } else {
2160                 if (!epos->offset)
2161                         epos->offset = sizeof(struct allocExtDesc);
2162                 ptr = epos->bh->b_data + epos->offset;
2163                 alen = sizeof(struct allocExtDesc) +
2164                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2165                                                         lengthAllocDescs);
2166         }
2167
2168         switch (iinfo->i_alloc_type) {
2169         case ICBTAG_FLAG_AD_SHORT:
2170                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2171                 if (!sad)
2172                         return -1;
2173                 etype = le32_to_cpu(sad->extLength) >> 30;
2174                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2175                 eloc->partitionReferenceNum =
2176                                 iinfo->i_location.partitionReferenceNum;
2177                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2178                 break;
2179         case ICBTAG_FLAG_AD_LONG:
2180                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2181                 if (!lad)
2182                         return -1;
2183                 etype = le32_to_cpu(lad->extLength) >> 30;
2184                 *eloc = lelb_to_cpu(lad->extLocation);
2185                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2186                 break;
2187         default:
2188                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2189                 return -1;
2190         }
2191
2192         return etype;
2193 }
2194
2195 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2196                               struct kernel_lb_addr neloc, uint32_t nelen)
2197 {
2198         struct kernel_lb_addr oeloc;
2199         uint32_t oelen;
2200         int8_t etype;
2201
2202         if (epos.bh)
2203                 get_bh(epos.bh);
2204
2205         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2206                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2207                 neloc = oeloc;
2208                 nelen = (etype << 30) | oelen;
2209         }
2210         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2211         brelse(epos.bh);
2212
2213         return (nelen >> 30);
2214 }
2215
2216 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2217                        struct kernel_lb_addr eloc, uint32_t elen)
2218 {
2219         struct extent_position oepos;
2220         int adsize;
2221         int8_t etype;
2222         struct allocExtDesc *aed;
2223         struct udf_inode_info *iinfo;
2224
2225         if (epos.bh) {
2226                 get_bh(epos.bh);
2227                 get_bh(epos.bh);
2228         }
2229
2230         iinfo = UDF_I(inode);
2231         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2232                 adsize = sizeof(struct short_ad);
2233         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2234                 adsize = sizeof(struct long_ad);
2235         else
2236                 adsize = 0;
2237
2238         oepos = epos;
2239         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2240                 return -1;
2241
2242         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2243                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2244                 if (oepos.bh != epos.bh) {
2245                         oepos.block = epos.block;
2246                         brelse(oepos.bh);
2247                         get_bh(epos.bh);
2248                         oepos.bh = epos.bh;
2249                         oepos.offset = epos.offset - adsize;
2250                 }
2251         }
2252         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2253         elen = 0;
2254
2255         if (epos.bh != oepos.bh) {
2256                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2257                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2258                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2259                 if (!oepos.bh) {
2260                         iinfo->i_lenAlloc -= (adsize * 2);
2261                         mark_inode_dirty(inode);
2262                 } else {
2263                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2264                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2265                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2266                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2267                                 udf_update_tag(oepos.bh->b_data,
2268                                                 oepos.offset - (2 * adsize));
2269                         else
2270                                 udf_update_tag(oepos.bh->b_data,
2271                                                 sizeof(struct allocExtDesc));
2272                         mark_buffer_dirty_inode(oepos.bh, inode);
2273                 }
2274         } else {
2275                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2276                 if (!oepos.bh) {
2277                         iinfo->i_lenAlloc -= adsize;
2278                         mark_inode_dirty(inode);
2279                 } else {
2280                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2281                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2282                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2283                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2284                                 udf_update_tag(oepos.bh->b_data,
2285                                                 epos.offset - adsize);
2286                         else
2287                                 udf_update_tag(oepos.bh->b_data,
2288                                                 sizeof(struct allocExtDesc));
2289                         mark_buffer_dirty_inode(oepos.bh, inode);
2290                 }
2291         }
2292
2293         brelse(epos.bh);
2294         brelse(oepos.bh);
2295
2296         return (elen >> 30);
2297 }
2298
2299 int8_t inode_bmap(struct inode *inode, sector_t block,
2300                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2301                   uint32_t *elen, sector_t *offset)
2302 {
2303         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2304         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2305         int8_t etype;
2306         struct udf_inode_info *iinfo;
2307
2308         iinfo = UDF_I(inode);
2309         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2310                 pos->offset = 0;
2311                 pos->block = iinfo->i_location;
2312                 pos->bh = NULL;
2313         }
2314         *elen = 0;
2315         do {
2316                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2317                 if (etype == -1) {
2318                         *offset = (bcount - lbcount) >> blocksize_bits;
2319                         iinfo->i_lenExtents = lbcount;
2320                         return -1;
2321                 }
2322                 lbcount += *elen;
2323         } while (lbcount <= bcount);
2324         /* update extent cache */
2325         udf_update_extent_cache(inode, lbcount - *elen, pos);
2326         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2327
2328         return etype;
2329 }
2330
2331 long udf_block_map(struct inode *inode, sector_t block)
2332 {
2333         struct kernel_lb_addr eloc;
2334         uint32_t elen;
2335         sector_t offset;
2336         struct extent_position epos = {};
2337         int ret;
2338
2339         down_read(&UDF_I(inode)->i_data_sem);
2340
2341         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2342                                                 (EXT_RECORDED_ALLOCATED >> 30))
2343                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2344         else
2345                 ret = 0;
2346
2347         up_read(&UDF_I(inode)->i_data_sem);
2348         brelse(epos.bh);
2349
2350         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2351                 return udf_fixed_to_variable(ret);
2352         else
2353                 return ret;
2354 }