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