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