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
 585         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 586         prev_epos.block = iinfo->i_location;
 587         prev_epos.bh = NULL;
 588         cur_epos = next_epos = prev_epos;
 589         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 590
 591         /* find the extent which contains the block we are looking for.
 592            alternate between laarr[0] and laarr[1] for locations of the
 593            current extent, and the previous extent */
 594         do {
 595                 if (prev_epos.bh != cur_epos.bh) {
 596                         brelse(prev_epos.bh);
 597                         get_bh(cur_epos.bh);
 598                         prev_epos.bh = cur_epos.bh;
 599                 }
 600                 if (cur_epos.bh != next_epos.bh) {
 601                         brelse(cur_epos.bh);
 602                         get_bh(next_epos.bh);
 603                         cur_epos.bh = next_epos.bh;
 604                 }
 605
 606                 lbcount += elen;
 607
 608                 prev_epos.block = cur_epos.block;
 609                 cur_epos.block = next_epos.block;
 610
 611                 prev_epos.offset = cur_epos.offset;
 612                 cur_epos.offset = next_epos.offset;
 613
 614                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 615                 if (etype == -1)
 616                         break;
 617
 618                 c = !c;
 619
 620                 laarr[c].extLength = (etype << 30) | elen;
 621                 laarr[c].extLocation = eloc;
 622
 623                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 624                         pgoal = eloc.logicalBlockNum +
 625                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 626                                  inode->i_sb->s_blocksize_bits);
 627
 628                 count++;
 629         } while (lbcount + elen <= b_off);
 630
 631         b_off -= lbcount;
 632         offset = b_off >> inode->i_sb->s_blocksize_bits;
 633         /*
 634          * Move prev_epos and cur_epos into indirect extent if we are at
 635          * the pointer to it
 636          */
 637         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 638         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 639
 640         /* if the extent is allocated and recorded, return the block
 641            if the extent is not a multiple of the blocksize, round up */
 642
 643         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 644                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 645                         elen = EXT_RECORDED_ALLOCATED |
 646                                 ((elen + inode->i_sb->s_blocksize - 1) &
 647                                  ~(inode->i_sb->s_blocksize - 1));
 648                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 649                 }
 650                 brelse(prev_epos.bh);
 651                 brelse(cur_epos.bh);
 652                 brelse(next_epos.bh);
 653                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 654                 *phys = newblock;
 655                 return NULL;
 656         }
 657
 658         last_block = block;
 659         /* Are we beyond EOF? */
 660         if (etype == -1) {
 661                 int ret;
 662
 663                 if (count) {
 664                         if (c)
 665                                 laarr[0] = laarr[1];
 666                         startnum = 1;
 667                 } else {
 668                         /* Create a fake extent when there's not one */
 669                         memset(&laarr[0].extLocation, 0x00,
 670                                 sizeof(struct kernel_lb_addr));
 671                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 672                         /* Will udf_do_extend_file() create real extent from
 673                            a fake one? */
 674                         startnum = (offset > 0);
 675                 }
 676                 /* Create extents for the hole between EOF and offset */
 677                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 678                 if (ret < 0) {
 679                         brelse(prev_epos.bh);
 680                         brelse(cur_epos.bh);
 681                         brelse(next_epos.bh);
 682                         *err = ret;
 683                         return NULL;
 684                 }
 685                 c = 0;
 686                 offset = 0;
 687                 count += ret;
 688                 /* We are not covered by a preallocated extent? */
 689                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 690                                                 EXT_NOT_RECORDED_ALLOCATED) {
 691                         /* Is there any real extent? - otherwise we overwrite
 692                          * the fake one... */
 693                         if (count)
 694                                 c = !c;
 695                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 696                                 inode->i_sb->s_blocksize;
 697                         memset(&laarr[c].extLocation, 0x00,
 698                                 sizeof(struct kernel_lb_addr));
 699                         count++;
 700                         endnum++;
 701                 }
 702                 endnum = c + 1;
 703                 lastblock = 1;
 704         } else {
 705                 endnum = startnum = ((count > 2) ? 2 : count);
 706
 707                 /* if the current extent is in position 0,
 708                    swap it with the previous */
 709                 if (!c && count != 1) {
 710                         laarr[2] = laarr[0];
 711                         laarr[0] = laarr[1];
 712                         laarr[1] = laarr[2];
 713                         c = 1;
 714                 }
 715
 716                 /* if the current block is located in an extent,
 717                    read the next extent */
 718                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 719                 if (etype != -1) {
 720                         laarr[c + 1].extLength = (etype << 30) | elen;
 721                         laarr[c + 1].extLocation = eloc;
 722                         count++;
 723                         startnum++;
 724                         endnum++;
 725                 } else
 726                         lastblock = 1;
 727         }
 728
 729         /* if the current extent is not recorded but allocated, get the
 730          * block in the extent corresponding to the requested block */
 731         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 732                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 733         else { /* otherwise, allocate a new block */
 734                 if (iinfo->i_next_alloc_block == block)
 735                         goal = iinfo->i_next_alloc_goal;
 736
 737                 if (!goal) {
 738                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 739                                 goal = iinfo->i_location.logicalBlockNum + 1;
 740                 }
 741
 742                 newblocknum = udf_new_block(inode->i_sb, inode,
 743                                 iinfo->i_location.partitionReferenceNum,
 744                                 goal, err);
 745                 if (!newblocknum) {
 746                         brelse(prev_epos.bh);
 747                         brelse(cur_epos.bh);
 748                         brelse(next_epos.bh);
 749                         *err = -ENOSPC;
 750                         return NULL;
 751                 }
 752                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 753         }
 754
 755         /* if the extent the requsted block is located in contains multiple
 756          * blocks, split the extent into at most three extents. blocks prior
 757          * to requested block, requested block, and blocks after requested
 758          * block */
 759         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 760
 761 #ifdef UDF_PREALLOCATE
 762         /* We preallocate blocks only for regular files. It also makes sense
 763          * for directories but there's a problem when to drop the
 764          * preallocation. We might use some delayed work for that but I feel
 765          * it's overengineering for a filesystem like UDF. */
 766         if (S_ISREG(inode->i_mode))
 767                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 768 #endif
 769
 770         /* merge any continuous blocks in laarr */
 771         udf_merge_extents(inode, laarr, &endnum);
 772
 773         /* write back the new extents, inserting new extents if the new number
 774          * of extents is greater than the old number, and deleting extents if
 775          * the new number of extents is less than the old number */
 776         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 777
 778         brelse(prev_epos.bh);
 779         brelse(cur_epos.bh);
 780         brelse(next_epos.bh);
 781
 782         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 783                                 iinfo->i_location.partitionReferenceNum, 0);
 784         if (!newblock)
 785                 return NULL;
 786         *phys = newblock;
 787         *err = 0;
 788         *new = 1;
 789         iinfo->i_next_alloc_block = block;
 790         iinfo->i_next_alloc_goal = newblocknum;
 791         inode->i_ctime = current_fs_time(inode->i_sb);
 792
 793         if (IS_SYNC(inode))
 794                 udf_sync_inode(inode);
 795         else
 796                 mark_inode_dirty(inode);
 797
 798         return result;
 799 }
 800
 801 static void udf_split_extents(struct inode *inode, int *c, int offset,
 802                               int newblocknum,
 803                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 804                               int *endnum)
 805 {
 806         unsigned long blocksize = inode->i_sb->s_blocksize;
 807         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 808
 809         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 810             (laarr[*c].extLength >> 30) ==
 811                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 812                 int curr = *c;
 813                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 814                             blocksize - 1) >> blocksize_bits;
 815                 int8_t etype = (laarr[curr].extLength >> 30);
 816
 817                 if (blen == 1)
 818                         ;
 819                 else if (!offset || blen == offset + 1) {
 820                         laarr[curr + 2] = laarr[curr + 1];
 821                         laarr[curr + 1] = laarr[curr];
 822                 } else {
 823                         laarr[curr + 3] = laarr[curr + 1];
 824                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 825                 }
 826
 827                 if (offset) {
 828                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 829                                 udf_free_blocks(inode->i_sb, inode,
 830                                                 &laarr[curr].extLocation,
 831                                                 0, offset);
 832                                 laarr[curr].extLength =
 833                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 834                                         (offset << blocksize_bits);
 835                                 laarr[curr].extLocation.logicalBlockNum = 0;
 836                                 laarr[curr].extLocation.
 837                                                 partitionReferenceNum = 0;
 838                         } else
 839                                 laarr[curr].extLength = (etype << 30) |
 840                                         (offset << blocksize_bits);
 841                         curr++;
 842                         (*c)++;
 843                         (*endnum)++;
 844                 }
 845
 846                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 847                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 848                         laarr[curr].extLocation.partitionReferenceNum =
 849                                 UDF_I(inode)->i_location.partitionReferenceNum;
 850                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 851                         blocksize;
 852                 curr++;
 853
 854                 if (blen != offset + 1) {
 855                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 856                                 laarr[curr].extLocation.logicalBlockNum +=
 857                                                                 offset + 1;
 858                         laarr[curr].extLength = (etype << 30) |
 859                                 ((blen - (offset + 1)) << blocksize_bits);
 860                         curr++;
 861                         (*endnum)++;
 862                 }
 863         }
 864 }
 865
 866 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 867                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 868                                  int *endnum)
 869 {
 870         int start, length = 0, currlength = 0, i;
 871
 872         if (*endnum >= (c + 1)) {
 873                 if (!lastblock)
 874                         return;
 875                 else
 876                         start = c;
 877         } else {
 878                 if ((laarr[c + 1].extLength >> 30) ==
 879                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 880                         start = c + 1;
 881                         length = currlength =
 882                                 (((laarr[c + 1].extLength &
 883                                         UDF_EXTENT_LENGTH_MASK) +
 884                                 inode->i_sb->s_blocksize - 1) >>
 885                                 inode->i_sb->s_blocksize_bits);
 886                 } else
 887                         start = c;
 888         }
 889
 890         for (i = start + 1; i <= *endnum; i++) {
 891                 if (i == *endnum) {
 892                         if (lastblock)
 893                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 894                 } else if ((laarr[i].extLength >> 30) ==
 895                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 896                         length += (((laarr[i].extLength &
 897                                                 UDF_EXTENT_LENGTH_MASK) +
 898                                     inode->i_sb->s_blocksize - 1) >>
 899                                     inode->i_sb->s_blocksize_bits);
 900                 } else
 901                         break;
 902         }
 903
 904         if (length) {
 905                 int next = laarr[start].extLocation.logicalBlockNum +
 906                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 907                           inode->i_sb->s_blocksize - 1) >>
 908                           inode->i_sb->s_blocksize_bits);
 909                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 910                                 laarr[start].extLocation.partitionReferenceNum,
 911                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 912                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 913                                 currlength);
 914                 if (numalloc)   {
 915                         if (start == (c + 1))
 916                                 laarr[start].extLength +=
 917                                         (numalloc <<
 918                                          inode->i_sb->s_blocksize_bits);
 919                         else {
 920                                 memmove(&laarr[c + 2], &laarr[c + 1],
 921                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 922                                 (*endnum)++;
 923                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 924                                 laarr[c + 1].extLocation.partitionReferenceNum =
 925                                         laarr[c].extLocation.
 926                                                         partitionReferenceNum;
 927                                 laarr[c + 1].extLength =
 928                                         EXT_NOT_RECORDED_ALLOCATED |
 929                                         (numalloc <<
 930                                          inode->i_sb->s_blocksize_bits);
 931                                 start = c + 1;
 932                         }
 933
 934                         for (i = start + 1; numalloc && i < *endnum; i++) {
 935                                 int elen = ((laarr[i].extLength &
 936                                                 UDF_EXTENT_LENGTH_MASK) +
 937                                             inode->i_sb->s_blocksize - 1) >>
 938                                             inode->i_sb->s_blocksize_bits;
 939
 940                                 if (elen > numalloc) {
 941                                         laarr[i].extLength -=
 942                                                 (numalloc <<
 943                                                  inode->i_sb->s_blocksize_bits);
 944                                         numalloc = 0;
 945                                 } else {
 946                                         numalloc -= elen;
 947                                         if (*endnum > (i + 1))
 948                                                 memmove(&laarr[i],
 949                                                         &laarr[i + 1],
 950                                                         sizeof(struct long_ad) *
 951                                                         (*endnum - (i + 1)));
 952                                         i--;
 953                                         (*endnum)--;
 954                                 }
 955                         }
 956                         UDF_I(inode)->i_lenExtents +=
 957                                 numalloc << inode->i_sb->s_blocksize_bits;
 958                 }
 959         }
 960 }
 961
 962 static void udf_merge_extents(struct inode *inode,
 963                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 964                               int *endnum)
 965 {
 966         int i;
 967         unsigned long blocksize = inode->i_sb->s_blocksize;
 968         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 969
 970         for (i = 0; i < (*endnum - 1); i++) {
 971                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 972                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 973
 974                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 975                         (((li->extLength >> 30) ==
 976                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 977                         ((lip1->extLocation.logicalBlockNum -
 978                           li->extLocation.logicalBlockNum) ==
 979                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 980                         blocksize - 1) >> blocksize_bits)))) {
 981
 982                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 983                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 984                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 985                                 lip1->extLength = (lip1->extLength -
 986                                                   (li->extLength &
 987                                                    UDF_EXTENT_LENGTH_MASK) +
 988                                                    UDF_EXTENT_LENGTH_MASK) &
 989                                                         ~(blocksize - 1);
 990                                 li->extLength = (li->extLength &
 991                                                  UDF_EXTENT_FLAG_MASK) +
 992                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 993                                                 blocksize;
 994                                 lip1->extLocation.logicalBlockNum =
 995                                         li->extLocation.logicalBlockNum +
 996                                         ((li->extLength &
 997                                                 UDF_EXTENT_LENGTH_MASK) >>
 998                                                 blocksize_bits);
 999                         } else {
1000                                 li->extLength = lip1->extLength +
1001                                         (((li->extLength &
1002                                                 UDF_EXTENT_LENGTH_MASK) +
1003                                          blocksize - 1) & ~(blocksize - 1));
1004                                 if (*endnum > (i + 2))
1005                                         memmove(&laarr[i + 1], &laarr[i + 2],
1006                                                 sizeof(struct long_ad) *
1007                                                 (*endnum - (i + 2)));
1008                                 i--;
1009                                 (*endnum)--;
1010                         }
1011                 } else if (((li->extLength >> 30) ==
1012                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1013                            ((lip1->extLength >> 30) ==
1014                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1015                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1016                                         ((li->extLength &
1017                                           UDF_EXTENT_LENGTH_MASK) +
1018                                          blocksize - 1) >> blocksize_bits);
1019                         li->extLocation.logicalBlockNum = 0;
1020                         li->extLocation.partitionReferenceNum = 0;
1021
1022                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1023                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1024                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1025                                 lip1->extLength = (lip1->extLength -
1026                                                    (li->extLength &
1027                                                    UDF_EXTENT_LENGTH_MASK) +
1028                                                    UDF_EXTENT_LENGTH_MASK) &
1029                                                    ~(blocksize - 1);
1030                                 li->extLength = (li->extLength &
1031                                                  UDF_EXTENT_FLAG_MASK) +
1032                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1033                                                 blocksize;
1034                         } else {
1035                                 li->extLength = lip1->extLength +
1036                                         (((li->extLength &
1037                                                 UDF_EXTENT_LENGTH_MASK) +
1038                                           blocksize - 1) & ~(blocksize - 1));
1039                                 if (*endnum > (i + 2))
1040                                         memmove(&laarr[i + 1], &laarr[i + 2],
1041                                                 sizeof(struct long_ad) *
1042                                                 (*endnum - (i + 2)));
1043                                 i--;
1044                                 (*endnum)--;
1045                         }
1046                 } else if ((li->extLength >> 30) ==
1047                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1048                         udf_free_blocks(inode->i_sb, inode,
1049                                         &li->extLocation, 0,
1050                                         ((li->extLength &
1051                                                 UDF_EXTENT_LENGTH_MASK) +
1052                                          blocksize - 1) >> blocksize_bits);
1053                         li->extLocation.logicalBlockNum = 0;
1054                         li->extLocation.partitionReferenceNum = 0;
1055                         li->extLength = (li->extLength &
1056                                                 UDF_EXTENT_LENGTH_MASK) |
1057                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1058                 }
1059         }
1060 }
1061
1062 static void udf_update_extents(struct inode *inode,
1063                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1064                                int startnum, int endnum,
1065                                struct extent_position *epos)
1066 {
1067         int start = 0, i;
1068         struct kernel_lb_addr tmploc;
1069         uint32_t tmplen;
1070
1071         if (startnum > endnum) {
1072                 for (i = 0; i < (startnum - endnum); i++)
1073                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1074                                         laarr[i].extLength);
1075         } else if (startnum < endnum) {
1076                 for (i = 0; i < (endnum - startnum); i++) {
1077                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1078                                         laarr[i].extLength);
1079                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1080                                       &laarr[i].extLength, 1);
1081                         start++;
1082                 }
1083         }
1084
1085         for (i = start; i < endnum; i++) {
1086                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1087                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1088                                laarr[i].extLength, 1);
1089         }
1090 }
1091
1092 struct buffer_head *udf_bread(struct inode *inode, int block,
1093                               int create, int *err)
1094 {
1095         struct buffer_head *bh = NULL;
1096
1097         bh = udf_getblk(inode, block, create, err);
1098         if (!bh)
1099                 return NULL;
1100
1101         if (buffer_uptodate(bh))
1102                 return bh;
1103
1104         ll_rw_block(READ, 1, &bh);
1105
1106         wait_on_buffer(bh);
1107         if (buffer_uptodate(bh))
1108                 return bh;
1109
1110         brelse(bh);
1111         *err = -EIO;
1112         return NULL;
1113 }
1114
1115 int udf_setsize(struct inode *inode, loff_t newsize)
1116 {
1117         int err;
1118         struct udf_inode_info *iinfo;
1119         int bsize = 1 << inode->i_blkbits;
1120
1121         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1122               S_ISLNK(inode->i_mode)))
1123                 return -EINVAL;
1124         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1125                 return -EPERM;
1126
1127         iinfo = UDF_I(inode);
1128         if (newsize > inode->i_size) {
1129                 down_write(&iinfo->i_data_sem);
1130                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1131                         if (bsize <
1132                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1133                                 err = udf_expand_file_adinicb(inode);
1134                                 if (err)
1135                                         return err;
1136                                 down_write(&iinfo->i_data_sem);
1137                         } else
1138                                 iinfo->i_lenAlloc = newsize;
1139                 }
1140                 err = udf_extend_file(inode, newsize);
1141                 if (err) {
1142                         up_write(&iinfo->i_data_sem);
1143                         return err;
1144                 }
1145                 truncate_setsize(inode, newsize);
1146                 up_write(&iinfo->i_data_sem);
1147         } else {
1148                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1149                         down_write(&iinfo->i_data_sem);
1150                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1151                                0x00, bsize - newsize -
1152                                udf_file_entry_alloc_offset(inode));
1153                         iinfo->i_lenAlloc = newsize;
1154                         truncate_setsize(inode, newsize);
1155                         up_write(&iinfo->i_data_sem);
1156                         goto update_time;
1157                 }
1158                 err = block_truncate_page(inode->i_mapping, newsize,
1159                                           udf_get_block);
1160                 if (err)
1161                         return err;
1162                 down_write(&iinfo->i_data_sem);
1163                 truncate_setsize(inode, newsize);
1164                 udf_truncate_extents(inode);
1165                 up_write(&iinfo->i_data_sem);
1166         }
1167 update_time:
1168         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1169         if (IS_SYNC(inode))
1170                 udf_sync_inode(inode);
1171         else
1172                 mark_inode_dirty(inode);
1173         return 0;
1174 }
1175
1176 static void __udf_read_inode(struct inode *inode)
1177 {
1178         struct buffer_head *bh = NULL;
1179         struct fileEntry *fe;
1180         uint16_t ident;
1181         struct udf_inode_info *iinfo = UDF_I(inode);
1182
1183         /*
1184          * Set defaults, but the inode is still incomplete!
1185          * Note: get_new_inode() sets the following on a new inode:
1186          *      i_sb = sb
1187          *      i_no = ino
1188          *      i_flags = sb->s_flags
1189          *      i_state = 0
1190          * clean_inode(): zero fills and sets
1191          *      i_count = 1
1192          *      i_nlink = 1
1193          *      i_op = NULL;
1194          */
1195         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1196         if (!bh) {
1197                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1198                 make_bad_inode(inode);
1199                 return;
1200         }
1201
1202         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1203             ident != TAG_IDENT_USE) {
1204                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1205                         inode->i_ino, ident);
1206                 brelse(bh);
1207                 make_bad_inode(inode);
1208                 return;
1209         }
1210
1211         fe = (struct fileEntry *)bh->b_data;
1212
1213         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1214                 struct buffer_head *ibh;
1215
1216                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1217                                         &ident);
1218                 if (ident == TAG_IDENT_IE && ibh) {
1219                         struct buffer_head *nbh = NULL;
1220                         struct kernel_lb_addr loc;
1221                         struct indirectEntry *ie;
1222
1223                         ie = (struct indirectEntry *)ibh->b_data;
1224                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1225
1226                         if (ie->indirectICB.extLength &&
1227                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1228                                                         &ident))) {
1229                                 if (ident == TAG_IDENT_FE ||
1230                                         ident == TAG_IDENT_EFE) {
1231                                         memcpy(&iinfo->i_location,
1232                                                 &loc,
1233                                                 sizeof(struct kernel_lb_addr));
1234                                         brelse(bh);
1235                                         brelse(ibh);
1236                                         brelse(nbh);
1237                                         __udf_read_inode(inode);
1238                                         return;
1239                                 }
1240                                 brelse(nbh);
1241                         }
1242                 }
1243                 brelse(ibh);
1244         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1245                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1246                         le16_to_cpu(fe->icbTag.strategyType));
1247                 brelse(bh);
1248                 make_bad_inode(inode);
1249                 return;
1250         }
1251         udf_fill_inode(inode, bh);
1252
1253         brelse(bh);
1254 }
1255
1256 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1257 {
1258         struct fileEntry *fe;
1259         struct extendedFileEntry *efe;
1260         int offset;
1261         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1262         struct udf_inode_info *iinfo = UDF_I(inode);
1263         unsigned int link_count;
1264
1265         fe = (struct fileEntry *)bh->b_data;
1266         efe = (struct extendedFileEntry *)bh->b_data;
1267
1268         if (fe->icbTag.strategyType == cpu_to_le16(4))
1269                 iinfo->i_strat4096 = 0;
1270         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1271                 iinfo->i_strat4096 = 1;
1272
1273         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1274                                                         ICBTAG_FLAG_AD_MASK;
1275         iinfo->i_unique = 0;
1276         iinfo->i_lenEAttr = 0;
1277         iinfo->i_lenExtents = 0;
1278         iinfo->i_lenAlloc = 0;
1279         iinfo->i_next_alloc_block = 0;
1280         iinfo->i_next_alloc_goal = 0;
1281         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1282                 iinfo->i_efe = 1;
1283                 iinfo->i_use = 0;
1284                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1285                                         sizeof(struct extendedFileEntry))) {
1286                         make_bad_inode(inode);
1287                         return;
1288                 }
1289                 memcpy(iinfo->i_ext.i_data,
1290                        bh->b_data + sizeof(struct extendedFileEntry),
1291                        inode->i_sb->s_blocksize -
1292                                         sizeof(struct extendedFileEntry));
1293         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1294                 iinfo->i_efe = 0;
1295                 iinfo->i_use = 0;
1296                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1297                                                 sizeof(struct fileEntry))) {
1298                         make_bad_inode(inode);
1299                         return;
1300                 }
1301                 memcpy(iinfo->i_ext.i_data,
1302                        bh->b_data + sizeof(struct fileEntry),
1303                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1304         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1305                 iinfo->i_efe = 0;
1306                 iinfo->i_use = 1;
1307                 iinfo->i_lenAlloc = le32_to_cpu(
1308                                 ((struct unallocSpaceEntry *)bh->b_data)->
1309                                  lengthAllocDescs);
1310                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1311                                         sizeof(struct unallocSpaceEntry))) {
1312                         make_bad_inode(inode);
1313                         return;
1314                 }
1315                 memcpy(iinfo->i_ext.i_data,
1316                        bh->b_data + sizeof(struct unallocSpaceEntry),
1317                        inode->i_sb->s_blocksize -
1318                                         sizeof(struct unallocSpaceEntry));
1319                 return;
1320         }
1321
1322         read_lock(&sbi->s_cred_lock);
1323         inode->i_uid = le32_to_cpu(fe->uid);
1324         if (inode->i_uid == -1 ||
1325             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1326             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1327                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1328
1329         inode->i_gid = le32_to_cpu(fe->gid);
1330         if (inode->i_gid == -1 ||
1331             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1332             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1333                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1334
1335         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1336                         sbi->s_fmode != UDF_INVALID_MODE)
1337                 inode->i_mode = sbi->s_fmode;
1338         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1339                         sbi->s_dmode != UDF_INVALID_MODE)
1340                 inode->i_mode = sbi->s_dmode;
1341         else
1342                 inode->i_mode = udf_convert_permissions(fe);
1343         inode->i_mode &= ~sbi->s_umask;
1344         read_unlock(&sbi->s_cred_lock);
1345
1346         link_count = le16_to_cpu(fe->fileLinkCount);
1347         if (!link_count)
1348                 link_count = 1;
1349         set_nlink(inode, link_count);
1350
1351         inode->i_size = le64_to_cpu(fe->informationLength);
1352         iinfo->i_lenExtents = inode->i_size;
1353
1354         if (iinfo->i_efe == 0) {
1355                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1356                         (inode->i_sb->s_blocksize_bits - 9);
1357
1358                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1359                         inode->i_atime = sbi->s_record_time;
1360
1361                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1362                                             fe->modificationTime))
1363                         inode->i_mtime = sbi->s_record_time;
1364
1365                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1366                         inode->i_ctime = sbi->s_record_time;
1367
1368                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1369                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1370                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1371                 offset = sizeof(struct fileEntry) + iinfo->i_lenEAttr;
1372         } else {
1373                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1374                     (inode->i_sb->s_blocksize_bits - 9);
1375
1376                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1377                         inode->i_atime = sbi->s_record_time;
1378
1379                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1380                                             efe->modificationTime))
1381                         inode->i_mtime = sbi->s_record_time;
1382
1383                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1384                         iinfo->i_crtime = sbi->s_record_time;
1385
1386                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1387                         inode->i_ctime = sbi->s_record_time;
1388
1389                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1390                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1391                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1392                 offset = sizeof(struct extendedFileEntry) +
1393                                                         iinfo->i_lenEAttr;
1394         }
1395
1396         switch (fe->icbTag.fileType) {
1397         case ICBTAG_FILE_TYPE_DIRECTORY:
1398                 inode->i_op = &udf_dir_inode_operations;
1399                 inode->i_fop = &udf_dir_operations;
1400                 inode->i_mode |= S_IFDIR;
1401                 inc_nlink(inode);
1402                 break;
1403         case ICBTAG_FILE_TYPE_REALTIME:
1404         case ICBTAG_FILE_TYPE_REGULAR:
1405         case ICBTAG_FILE_TYPE_UNDEF:
1406         case ICBTAG_FILE_TYPE_VAT20:
1407                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1408                         inode->i_data.a_ops = &udf_adinicb_aops;
1409                 else
1410                         inode->i_data.a_ops = &udf_aops;
1411                 inode->i_op = &udf_file_inode_operations;
1412                 inode->i_fop = &udf_file_operations;
1413                 inode->i_mode |= S_IFREG;
1414                 break;
1415         case ICBTAG_FILE_TYPE_BLOCK:
1416                 inode->i_mode |= S_IFBLK;
1417                 break;
1418         case ICBTAG_FILE_TYPE_CHAR:
1419                 inode->i_mode |= S_IFCHR;
1420                 break;
1421         case ICBTAG_FILE_TYPE_FIFO:
1422                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1423                 break;
1424         case ICBTAG_FILE_TYPE_SOCKET:
1425                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1426                 break;
1427         case ICBTAG_FILE_TYPE_SYMLINK:
1428                 inode->i_data.a_ops = &udf_symlink_aops;
1429                 inode->i_op = &udf_symlink_inode_operations;
1430                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1431                 break;
1432         case ICBTAG_FILE_TYPE_MAIN:
1433                 udf_debug("METADATA FILE-----\n");
1434                 break;
1435         case ICBTAG_FILE_TYPE_MIRROR:
1436                 udf_debug("METADATA MIRROR FILE-----\n");
1437                 break;
1438         case ICBTAG_FILE_TYPE_BITMAP:
1439                 udf_debug("METADATA BITMAP FILE-----\n");
1440                 break;
1441         default:
1442                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1443                         inode->i_ino, fe->icbTag.fileType);
1444                 make_bad_inode(inode);
1445                 return;
1446         }
1447         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1448                 struct deviceSpec *dsea =
1449                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1450                 if (dsea) {
1451                         init_special_inode(inode, inode->i_mode,
1452                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1453                                       le32_to_cpu(dsea->minorDeviceIdent)));
1454                         /* Developer ID ??? */
1455                 } else
1456                         make_bad_inode(inode);
1457         }
1458 }
1459
1460 static int udf_alloc_i_data(struct inode *inode, size_t size)
1461 {
1462         struct udf_inode_info *iinfo = UDF_I(inode);
1463         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1464
1465         if (!iinfo->i_ext.i_data) {
1466                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1467                         inode->i_ino);
1468                 return -ENOMEM;
1469         }
1470
1471         return 0;
1472 }
1473
1474 static mode_t udf_convert_permissions(struct fileEntry *fe)
1475 {
1476         mode_t mode;
1477         uint32_t permissions;
1478         uint32_t flags;
1479
1480         permissions = le32_to_cpu(fe->permissions);
1481         flags = le16_to_cpu(fe->icbTag.flags);
1482
1483         mode =  ((permissions) & S_IRWXO) |
1484                 ((permissions >> 2) & S_IRWXG) |
1485                 ((permissions >> 4) & S_IRWXU) |
1486                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1487                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1488                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1489
1490         return mode;
1491 }
1492
1493 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1494 {
1495         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1496 }
1497
1498 static int udf_sync_inode(struct inode *inode)
1499 {
1500         return udf_update_inode(inode, 1);
1501 }
1502
1503 static int udf_update_inode(struct inode *inode, int do_sync)
1504 {
1505         struct buffer_head *bh = NULL;
1506         struct fileEntry *fe;
1507         struct extendedFileEntry *efe;
1508         uint32_t udfperms;
1509         uint16_t icbflags;
1510         uint16_t crclen;
1511         int err = 0;
1512         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1513         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1514         struct udf_inode_info *iinfo = UDF_I(inode);
1515
1516         bh = udf_tgetblk(inode->i_sb,
1517                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1518         if (!bh) {
1519                 udf_debug("getblk failure\n");
1520                 return -ENOMEM;
1521         }
1522
1523         lock_buffer(bh);
1524         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1525         fe = (struct fileEntry *)bh->b_data;
1526         efe = (struct extendedFileEntry *)bh->b_data;
1527
1528         if (iinfo->i_use) {
1529                 struct unallocSpaceEntry *use =
1530                         (struct unallocSpaceEntry *)bh->b_data;
1531
1532                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1533                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1534                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1535                                         sizeof(struct unallocSpaceEntry));
1536                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1537                 use->descTag.tagLocation =
1538                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1539                 crclen = sizeof(struct unallocSpaceEntry) +
1540                                 iinfo->i_lenAlloc - sizeof(struct tag);
1541                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1542                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1543                                                            sizeof(struct tag),
1544                                                            crclen));
1545                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1546
1547                 goto out;
1548         }
1549
1550         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1551                 fe->uid = cpu_to_le32(-1);
1552         else
1553                 fe->uid = cpu_to_le32(inode->i_uid);
1554
1555         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1556                 fe->gid = cpu_to_le32(-1);
1557         else
1558                 fe->gid = cpu_to_le32(inode->i_gid);
1559
1560         udfperms = ((inode->i_mode & S_IRWXO)) |
1561                    ((inode->i_mode & S_IRWXG) << 2) |
1562                    ((inode->i_mode & S_IRWXU) << 4);
1563
1564         udfperms |= (le32_to_cpu(fe->permissions) &
1565                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1566                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1567                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1568         fe->permissions = cpu_to_le32(udfperms);
1569
1570         if (S_ISDIR(inode->i_mode))
1571                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1572         else
1573                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1574
1575         fe->informationLength = cpu_to_le64(inode->i_size);
1576
1577         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1578                 struct regid *eid;
1579                 struct deviceSpec *dsea =
1580                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1581                 if (!dsea) {
1582                         dsea = (struct deviceSpec *)
1583                                 udf_add_extendedattr(inode,
1584                                                      sizeof(struct deviceSpec) +
1585                                                      sizeof(struct regid), 12, 0x3);
1586                         dsea->attrType = cpu_to_le32(12);
1587                         dsea->attrSubtype = 1;
1588                         dsea->attrLength = cpu_to_le32(
1589                                                 sizeof(struct deviceSpec) +
1590                                                 sizeof(struct regid));
1591                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1592                 }
1593                 eid = (struct regid *)dsea->impUse;
1594                 memset(eid, 0, sizeof(struct regid));
1595                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1596                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1597                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1598                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1599                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1600         }
1601
1602         if (iinfo->i_efe == 0) {
1603                 memcpy(bh->b_data + sizeof(struct fileEntry),
1604                        iinfo->i_ext.i_data,
1605                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1606                 fe->logicalBlocksRecorded = cpu_to_le64(
1607                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1608                         (blocksize_bits - 9));
1609
1610                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1611                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1612                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1613                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1614                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1615                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1616                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1617                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1618                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1619                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1620                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1621                 crclen = sizeof(struct fileEntry);
1622         } else {
1623                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1624                        iinfo->i_ext.i_data,
1625                        inode->i_sb->s_blocksize -
1626                                         sizeof(struct extendedFileEntry));
1627                 efe->objectSize = cpu_to_le64(inode->i_size);
1628                 efe->logicalBlocksRecorded = cpu_to_le64(
1629                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1630                         (blocksize_bits - 9));
1631
1632                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1633                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1634                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1635                         iinfo->i_crtime = inode->i_atime;
1636
1637                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1638                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1639                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1640                         iinfo->i_crtime = inode->i_mtime;
1641
1642                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1643                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1644                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1645                         iinfo->i_crtime = inode->i_ctime;
1646
1647                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1648                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1649                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1650                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1651
1652                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1653                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1654                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1655                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1656                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1657                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1658                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1659                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1660                 crclen = sizeof(struct extendedFileEntry);
1661         }
1662         if (iinfo->i_strat4096) {
1663                 fe->icbTag.strategyType = cpu_to_le16(4096);
1664                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1665                 fe->icbTag.numEntries = cpu_to_le16(2);
1666         } else {
1667                 fe->icbTag.strategyType = cpu_to_le16(4);
1668                 fe->icbTag.numEntries = cpu_to_le16(1);
1669         }
1670
1671         if (S_ISDIR(inode->i_mode))
1672                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1673         else if (S_ISREG(inode->i_mode))
1674                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1675         else if (S_ISLNK(inode->i_mode))
1676                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1677         else if (S_ISBLK(inode->i_mode))
1678                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1679         else if (S_ISCHR(inode->i_mode))
1680                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1681         else if (S_ISFIFO(inode->i_mode))
1682                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1683         else if (S_ISSOCK(inode->i_mode))
1684                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1685
1686         icbflags =      iinfo->i_alloc_type |
1687                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1688                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1689                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1690                         (le16_to_cpu(fe->icbTag.flags) &
1691                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1692                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1693
1694         fe->icbTag.flags = cpu_to_le16(icbflags);
1695         if (sbi->s_udfrev >= 0x0200)
1696                 fe->descTag.descVersion = cpu_to_le16(3);
1697         else
1698                 fe->descTag.descVersion = cpu_to_le16(2);
1699         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1700         fe->descTag.tagLocation = cpu_to_le32(
1701                                         iinfo->i_location.logicalBlockNum);
1702         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1703         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1704         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1705                                                   crclen));
1706         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1707
1708 out:
1709         set_buffer_uptodate(bh);
1710         unlock_buffer(bh);
1711
1712         /* write the data blocks */
1713         mark_buffer_dirty(bh);
1714         if (do_sync) {
1715                 sync_dirty_buffer(bh);
1716                 if (buffer_write_io_error(bh)) {
1717                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1718                                  inode->i_ino);
1719                         err = -EIO;
1720                 }
1721         }
1722         brelse(bh);
1723
1724         return err;
1725 }
1726
1727 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1728 {
1729         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1730         struct inode *inode = iget_locked(sb, block);
1731
1732         if (!inode)
1733                 return NULL;
1734
1735         if (inode->i_state & I_NEW) {
1736                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1737                 __udf_read_inode(inode);
1738                 unlock_new_inode(inode);
1739         }
1740
1741         if (is_bad_inode(inode))
1742                 goto out_iput;
1743
1744         if (ino->logicalBlockNum >= UDF_SB(sb)->
1745                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1746                 udf_debug("block=%d, partition=%d out of range\n",
1747                           ino->logicalBlockNum, ino->partitionReferenceNum);
1748                 make_bad_inode(inode);
1749                 goto out_iput;
1750         }
1751
1752         return inode;
1753
1754  out_iput:
1755         iput(inode);
1756         return NULL;
1757 }
1758
1759 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1760                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1761 {
1762         int adsize;
1763         struct short_ad *sad = NULL;
1764         struct long_ad *lad = NULL;
1765         struct allocExtDesc *aed;
1766         uint8_t *ptr;
1767         struct udf_inode_info *iinfo = UDF_I(inode);
1768
1769         if (!epos->bh)
1770                 ptr = iinfo->i_ext.i_data + epos->offset -
1771                         udf_file_entry_alloc_offset(inode) +
1772                         iinfo->i_lenEAttr;
1773         else
1774                 ptr = epos->bh->b_data + epos->offset;
1775
1776         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1777                 adsize = sizeof(struct short_ad);
1778         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1779                 adsize = sizeof(struct long_ad);
1780         else
1781                 return -EIO;
1782
1783         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1784                 unsigned char *sptr, *dptr;
1785                 struct buffer_head *nbh;
1786                 int err, loffset;
1787                 struct kernel_lb_addr obloc = epos->block;
1788
1789                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1790                                                 obloc.partitionReferenceNum,
1791                                                 obloc.logicalBlockNum, &err);
1792                 if (!epos->block.logicalBlockNum)
1793                         return -ENOSPC;
1794                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1795                                                                  &epos->block,
1796                                                                  0));
1797                 if (!nbh)
1798                         return -EIO;
1799                 lock_buffer(nbh);
1800                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1801                 set_buffer_uptodate(nbh);
1802                 unlock_buffer(nbh);
1803                 mark_buffer_dirty_inode(nbh, inode);
1804
1805                 aed = (struct allocExtDesc *)(nbh->b_data);
1806                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1807                         aed->previousAllocExtLocation =
1808                                         cpu_to_le32(obloc.logicalBlockNum);
1809                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1810                         loffset = epos->offset;
1811                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1812                         sptr = ptr - adsize;
1813                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1814                         memcpy(dptr, sptr, adsize);
1815                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1816                 } else {
1817                         loffset = epos->offset + adsize;
1818                         aed->lengthAllocDescs = cpu_to_le32(0);
1819                         sptr = ptr;
1820                         epos->offset = sizeof(struct allocExtDesc);
1821
1822                         if (epos->bh) {
1823                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1824                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1825                         } else {
1826                                 iinfo->i_lenAlloc += adsize;
1827                                 mark_inode_dirty(inode);
1828                         }
1829                 }
1830                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1831                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1832                                     epos->block.logicalBlockNum, sizeof(struct tag));
1833                 else
1834                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1835                                     epos->block.logicalBlockNum, sizeof(struct tag));
1836                 switch (iinfo->i_alloc_type) {
1837                 case ICBTAG_FLAG_AD_SHORT:
1838                         sad = (struct short_ad *)sptr;
1839                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1840                                                      inode->i_sb->s_blocksize);
1841                         sad->extPosition =
1842                                 cpu_to_le32(epos->block.logicalBlockNum);
1843                         break;
1844                 case ICBTAG_FLAG_AD_LONG:
1845                         lad = (struct long_ad *)sptr;
1846                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1847                                                      inode->i_sb->s_blocksize);
1848                         lad->extLocation = cpu_to_lelb(epos->block);
1849                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1850                         break;
1851                 }
1852                 if (epos->bh) {
1853                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1854                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1855                                 udf_update_tag(epos->bh->b_data, loffset);
1856                         else
1857                                 udf_update_tag(epos->bh->b_data,
1858                                                 sizeof(struct allocExtDesc));
1859                         mark_buffer_dirty_inode(epos->bh, inode);
1860                         brelse(epos->bh);
1861                 } else {
1862                         mark_inode_dirty(inode);
1863                 }
1864                 epos->bh = nbh;
1865         }
1866
1867         udf_write_aext(inode, epos, eloc, elen, inc);
1868
1869         if (!epos->bh) {
1870                 iinfo->i_lenAlloc += adsize;
1871                 mark_inode_dirty(inode);
1872         } else {
1873                 aed = (struct allocExtDesc *)epos->bh->b_data;
1874                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1875                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1876                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1877                         udf_update_tag(epos->bh->b_data,
1878                                         epos->offset + (inc ? 0 : adsize));
1879                 else
1880                         udf_update_tag(epos->bh->b_data,
1881                                         sizeof(struct allocExtDesc));
1882                 mark_buffer_dirty_inode(epos->bh, inode);
1883         }
1884
1885         return 0;
1886 }
1887
1888 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1889                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1890 {
1891         int adsize;
1892         uint8_t *ptr;
1893         struct short_ad *sad;
1894         struct long_ad *lad;
1895         struct udf_inode_info *iinfo = UDF_I(inode);
1896
1897         if (!epos->bh)
1898                 ptr = iinfo->i_ext.i_data + epos->offset -
1899                         udf_file_entry_alloc_offset(inode) +
1900                         iinfo->i_lenEAttr;
1901         else
1902                 ptr = epos->bh->b_data + epos->offset;
1903
1904         switch (iinfo->i_alloc_type) {
1905         case ICBTAG_FLAG_AD_SHORT:
1906                 sad = (struct short_ad *)ptr;
1907                 sad->extLength = cpu_to_le32(elen);
1908                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1909                 adsize = sizeof(struct short_ad);
1910                 break;
1911         case ICBTAG_FLAG_AD_LONG:
1912                 lad = (struct long_ad *)ptr;
1913                 lad->extLength = cpu_to_le32(elen);
1914                 lad->extLocation = cpu_to_lelb(*eloc);
1915                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1916                 adsize = sizeof(struct long_ad);
1917                 break;
1918         default:
1919                 return;
1920         }
1921
1922         if (epos->bh) {
1923                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1924                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1925                         struct allocExtDesc *aed =
1926                                 (struct allocExtDesc *)epos->bh->b_data;
1927                         udf_update_tag(epos->bh->b_data,
1928                                        le32_to_cpu(aed->lengthAllocDescs) +
1929                                        sizeof(struct allocExtDesc));
1930                 }
1931                 mark_buffer_dirty_inode(epos->bh, inode);
1932         } else {
1933                 mark_inode_dirty(inode);
1934         }
1935
1936         if (inc)
1937                 epos->offset += adsize;
1938 }
1939
1940 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1941                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1942 {
1943         int8_t etype;
1944
1945         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1946                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1947                 int block;
1948                 epos->block = *eloc;
1949                 epos->offset = sizeof(struct allocExtDesc);
1950                 brelse(epos->bh);
1951                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1952                 epos->bh = udf_tread(inode->i_sb, block);
1953                 if (!epos->bh) {
1954                         udf_debug("reading block %d failed!\n", block);
1955                         return -1;
1956                 }
1957         }
1958
1959         return etype;
1960 }
1961
1962 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1963                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1964 {
1965         int alen;
1966         int8_t etype;
1967         uint8_t *ptr;
1968         struct short_ad *sad;
1969         struct long_ad *lad;
1970         struct udf_inode_info *iinfo = UDF_I(inode);
1971
1972         if (!epos->bh) {
1973                 if (!epos->offset)
1974                         epos->offset = udf_file_entry_alloc_offset(inode);
1975                 ptr = iinfo->i_ext.i_data + epos->offset -
1976                         udf_file_entry_alloc_offset(inode) +
1977                         iinfo->i_lenEAttr;
1978                 alen = udf_file_entry_alloc_offset(inode) +
1979                                                         iinfo->i_lenAlloc;
1980         } else {
1981                 if (!epos->offset)
1982                         epos->offset = sizeof(struct allocExtDesc);
1983                 ptr = epos->bh->b_data + epos->offset;
1984                 alen = sizeof(struct allocExtDesc) +
1985                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1986                                                         lengthAllocDescs);
1987         }
1988
1989         switch (iinfo->i_alloc_type) {
1990         case ICBTAG_FLAG_AD_SHORT:
1991                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1992                 if (!sad)
1993                         return -1;
1994                 etype = le32_to_cpu(sad->extLength) >> 30;
1995                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1996                 eloc->partitionReferenceNum =
1997                                 iinfo->i_location.partitionReferenceNum;
1998                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1999                 break;
2000         case ICBTAG_FLAG_AD_LONG:
2001                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2002                 if (!lad)
2003                         return -1;
2004                 etype = le32_to_cpu(lad->extLength) >> 30;
2005                 *eloc = lelb_to_cpu(lad->extLocation);
2006                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2007                 break;
2008         default:
2009                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2010                 return -1;
2011         }
2012
2013         return etype;
2014 }
2015
2016 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2017                               struct kernel_lb_addr neloc, uint32_t nelen)
2018 {
2019         struct kernel_lb_addr oeloc;
2020         uint32_t oelen;
2021         int8_t etype;
2022
2023         if (epos.bh)
2024                 get_bh(epos.bh);
2025
2026         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2027                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2028                 neloc = oeloc;
2029                 nelen = (etype << 30) | oelen;
2030         }
2031         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2032         brelse(epos.bh);
2033
2034         return (nelen >> 30);
2035 }
2036
2037 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2038                        struct kernel_lb_addr eloc, uint32_t elen)
2039 {
2040         struct extent_position oepos;
2041         int adsize;
2042         int8_t etype;
2043         struct allocExtDesc *aed;
2044         struct udf_inode_info *iinfo;
2045
2046         if (epos.bh) {
2047                 get_bh(epos.bh);
2048                 get_bh(epos.bh);
2049         }
2050
2051         iinfo = UDF_I(inode);
2052         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2053                 adsize = sizeof(struct short_ad);
2054         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2055                 adsize = sizeof(struct long_ad);
2056         else
2057                 adsize = 0;
2058
2059         oepos = epos;
2060         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2061                 return -1;
2062
2063         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2064                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2065                 if (oepos.bh != epos.bh) {
2066                         oepos.block = epos.block;
2067                         brelse(oepos.bh);
2068                         get_bh(epos.bh);
2069                         oepos.bh = epos.bh;
2070                         oepos.offset = epos.offset - adsize;
2071                 }
2072         }
2073         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2074         elen = 0;
2075
2076         if (epos.bh != oepos.bh) {
2077                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2078                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2079                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2080                 if (!oepos.bh) {
2081                         iinfo->i_lenAlloc -= (adsize * 2);
2082                         mark_inode_dirty(inode);
2083                 } else {
2084                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2085                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2086                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2087                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2088                                 udf_update_tag(oepos.bh->b_data,
2089                                                 oepos.offset - (2 * adsize));
2090                         else
2091                                 udf_update_tag(oepos.bh->b_data,
2092                                                 sizeof(struct allocExtDesc));
2093                         mark_buffer_dirty_inode(oepos.bh, inode);
2094                 }
2095         } else {
2096                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2097                 if (!oepos.bh) {
2098                         iinfo->i_lenAlloc -= adsize;
2099                         mark_inode_dirty(inode);
2100                 } else {
2101                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2102                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2103                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2104                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2105                                 udf_update_tag(oepos.bh->b_data,
2106                                                 epos.offset - adsize);
2107                         else
2108                                 udf_update_tag(oepos.bh->b_data,
2109                                                 sizeof(struct allocExtDesc));
2110                         mark_buffer_dirty_inode(oepos.bh, inode);
2111                 }
2112         }
2113
2114         brelse(epos.bh);
2115         brelse(oepos.bh);
2116
2117         return (elen >> 30);
2118 }
2119
2120 int8_t inode_bmap(struct inode *inode, sector_t block,
2121                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2122                   uint32_t *elen, sector_t *offset)
2123 {
2124         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2125         loff_t lbcount = 0, bcount =
2126             (loff_t) block << blocksize_bits;
2127         int8_t etype;
2128         struct udf_inode_info *iinfo;
2129
2130         iinfo = UDF_I(inode);
2131         pos->offset = 0;
2132         pos->block = iinfo->i_location;
2133         pos->bh = NULL;
2134         *elen = 0;
2135
2136         do {
2137                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2138                 if (etype == -1) {
2139                         *offset = (bcount - lbcount) >> blocksize_bits;
2140                         iinfo->i_lenExtents = lbcount;
2141                         return -1;
2142                 }
2143                 lbcount += *elen;
2144         } while (lbcount <= bcount);
2145
2146         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2147
2148         return etype;
2149 }
2150
2151 long udf_block_map(struct inode *inode, sector_t block)
2152 {
2153         struct kernel_lb_addr eloc;
2154         uint32_t elen;
2155         sector_t offset;
2156         struct extent_position epos = {};
2157         int ret;
2158
2159         down_read(&UDF_I(inode)->i_data_sem);
2160
2161         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2162                                                 (EXT_RECORDED_ALLOCATED >> 30))
2163                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2164         else
2165                 ret = 0;
2166
2167         up_read(&UDF_I(inode)->i_data_sem);
2168         brelse(epos.bh);
2169
2170         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2171                 return udf_fixed_to_variable(ret);
2172         else
2173                 return ret;
2174 }