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