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