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