fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/writeback.h>
  38 #include <linux/slab.h>
  39 #include <linux/crc-itu-t.h>
  40 #include <linux/mpage.h>
  41
  42 #include "udf_i.h"
  43 #include "udf_sb.h"
  44
  45 MODULE_AUTHOR("Ben Fennema");
  46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  47 MODULE_LICENSE("GPL");
  48
  49 #define EXTENT_MERGE_SIZE 5
  50
  51 static umode_t udf_convert_permissions(struct fileEntry *);
  52 static int udf_update_inode(struct inode *, int);
  53 static void udf_fill_inode(struct inode *, struct buffer_head *);
  54 static int udf_sync_inode(struct inode *inode);
  55 static int udf_alloc_i_data(struct inode *inode, size_t size);
  56 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  58                               struct kernel_lb_addr, uint32_t);
  59 static void udf_split_extents(struct inode *, int *, int, int,
  60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_prealloc_extents(struct inode *, int, int,
  62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_merge_extents(struct inode *,
  64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  65 static void udf_update_extents(struct inode *,
  66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  67                                struct extent_position *);
  68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  69
  70
  71 void udf_evict_inode(struct inode *inode)
  72 {
  73         struct udf_inode_info *iinfo = UDF_I(inode);
  74         int want_delete = 0;
  75
  76         if (!inode->i_nlink && !is_bad_inode(inode)) {
  77                 want_delete = 1;
  78                 udf_setsize(inode, 0);
  79                 udf_update_inode(inode, IS_SYNC(inode));
  80         } else
  81                 truncate_inode_pages(&inode->i_data, 0);
  82         invalidate_inode_buffers(inode);
  83         clear_inode(inode);
  84         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
  85             inode->i_size != iinfo->i_lenExtents) {
  86                 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
  87                          inode->i_ino, inode->i_mode,
  88                          (unsigned long long)inode->i_size,
  89                          (unsigned long long)iinfo->i_lenExtents);
  90         }
  91         kfree(iinfo->i_ext.i_data);
  92         iinfo->i_ext.i_data = NULL;
  93         if (want_delete) {
  94                 udf_free_inode(inode);
  95         }
  96 }
  97
  98 static int udf_writepage(struct page *page, struct writeback_control *wbc)
  99 {
 100         return block_write_full_page(page, udf_get_block, wbc);
 101 }
 102
 103 static int udf_readpage(struct file *file, struct page *page)
 104 {
 105         return mpage_readpage(page, udf_get_block);
 106 }
 107
 108 static int udf_readpages(struct file *file, struct address_space *mapping,
 109                         struct list_head *pages, unsigned nr_pages)
 110 {
 111         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 112 }
 113
 114 static int udf_write_begin(struct file *file, struct address_space *mapping,
 115                         loff_t pos, unsigned len, unsigned flags,
 116                         struct page **pagep, void **fsdata)
 117 {
 118         int ret;
 119
 120         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 121         if (unlikely(ret)) {
 122                 struct inode *inode = mapping->host;
 123                 struct udf_inode_info *iinfo = UDF_I(inode);
 124                 loff_t isize = inode->i_size;
 125
 126                 if (pos + len > isize) {
 127                         truncate_pagecache(inode, pos + len, isize);
 128                         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 129                                 down_write(&iinfo->i_data_sem);
 130                                 udf_truncate_extents(inode);
 131                                 up_write(&iinfo->i_data_sem);
 132                         }
 133                 }
 134         }
 135
 136         return ret;
 137 }
 138
 139 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 140 {
 141         return generic_block_bmap(mapping, block, udf_get_block);
 142 }
 143
 144 const struct address_space_operations udf_aops = {
 145         .readpage       = udf_readpage,
 146         .readpages      = udf_readpages,
 147         .writepage      = udf_writepage,
 148         .write_begin            = udf_write_begin,
 149         .write_end              = generic_write_end,
 150         .bmap           = udf_bmap,
 151 };
 152
 153 /*
 154  * Expand file stored in ICB to a normal one-block-file
 155  *
 156  * This function requires i_data_sem for writing and releases it.
 157  * This function requires i_mutex held
 158  */
 159 int udf_expand_file_adinicb(struct inode *inode)
 160 {
 161         struct page *page;
 162         char *kaddr;
 163         struct udf_inode_info *iinfo = UDF_I(inode);
 164         int err;
 165         struct writeback_control udf_wbc = {
 166                 .sync_mode = WB_SYNC_NONE,
 167                 .nr_to_write = 1,
 168         };
 169
 170         if (!iinfo->i_lenAlloc) {
 171                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 172                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 173                 else
 174                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 175                 /* from now on we have normal address_space methods */
 176                 inode->i_data.a_ops = &udf_aops;
 177                 up_write(&iinfo->i_data_sem);
 178                 mark_inode_dirty(inode);
 179                 return 0;
 180         }
 181         /*
 182          * Release i_data_sem so that we can lock a page - page lock ranks
 183          * above i_data_sem. i_mutex still protects us against file changes.
 184          */
 185         up_write(&iinfo->i_data_sem);
 186
 187         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 188         if (!page)
 189                 return -ENOMEM;
 190
 191         if (!PageUptodate(page)) {
 192                 kaddr = kmap(page);
 193                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 194                        PAGE_CACHE_SIZE - iinfo->i_lenAlloc);
 195                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 196                         iinfo->i_lenAlloc);
 197                 flush_dcache_page(page);
 198                 SetPageUptodate(page);
 199                 kunmap(page);
 200         }
 201         down_write(&iinfo->i_data_sem);
 202         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 203                iinfo->i_lenAlloc);
 204         iinfo->i_lenAlloc = 0;
 205         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 206                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 207         else
 208                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 209         /* from now on we have normal address_space methods */
 210         inode->i_data.a_ops = &udf_aops;
 211         up_write(&iinfo->i_data_sem);
 212         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 213         if (err) {
 214                 /* Restore everything back so that we don't lose data... */
 215                 lock_page(page);
 216                 kaddr = kmap(page);
 217                 down_write(&iinfo->i_data_sem);
 218                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 219                        inode->i_size);
 220                 kunmap(page);
 221                 unlock_page(page);
 222                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 223                 inode->i_data.a_ops = &udf_adinicb_aops;
 224                 up_write(&iinfo->i_data_sem);
 225         }
 226         page_cache_release(page);
 227         mark_inode_dirty(inode);
 228
 229         return err;
 230 }
 231
 232 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 233                                            int *err)
 234 {
 235         int newblock;
 236         struct buffer_head *dbh = NULL;
 237         struct kernel_lb_addr eloc;
 238         uint8_t alloctype;
 239         struct extent_position epos;
 240
 241         struct udf_fileident_bh sfibh, dfibh;
 242         loff_t f_pos = udf_ext0_offset(inode);
 243         int size = udf_ext0_offset(inode) + inode->i_size;
 244         struct fileIdentDesc cfi, *sfi, *dfi;
 245         struct udf_inode_info *iinfo = UDF_I(inode);
 246
 247         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 248                 alloctype = ICBTAG_FLAG_AD_SHORT;
 249         else
 250                 alloctype = ICBTAG_FLAG_AD_LONG;
 251
 252         if (!inode->i_size) {
 253                 iinfo->i_alloc_type = alloctype;
 254                 mark_inode_dirty(inode);
 255                 return NULL;
 256         }
 257
 258         /* alloc block, and copy data to it */
 259         *block = udf_new_block(inode->i_sb, inode,
 260                                iinfo->i_location.partitionReferenceNum,
 261                                iinfo->i_location.logicalBlockNum, err);
 262         if (!(*block))
 263                 return NULL;
 264         newblock = udf_get_pblock(inode->i_sb, *block,
 265                                   iinfo->i_location.partitionReferenceNum,
 266                                 0);
 267         if (!newblock)
 268                 return NULL;
 269         dbh = udf_tgetblk(inode->i_sb, newblock);
 270         if (!dbh)
 271                 return NULL;
 272         lock_buffer(dbh);
 273         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 274         set_buffer_uptodate(dbh);
 275         unlock_buffer(dbh);
 276         mark_buffer_dirty_inode(dbh, inode);
 277
 278         sfibh.soffset = sfibh.eoffset =
 279                         f_pos & (inode->i_sb->s_blocksize - 1);
 280         sfibh.sbh = sfibh.ebh = NULL;
 281         dfibh.soffset = dfibh.eoffset = 0;
 282         dfibh.sbh = dfibh.ebh = dbh;
 283         while (f_pos < size) {
 284                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 285                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 286                                          NULL, NULL, NULL);
 287                 if (!sfi) {
 288                         brelse(dbh);
 289                         return NULL;
 290                 }
 291                 iinfo->i_alloc_type = alloctype;
 292                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 293                 dfibh.soffset = dfibh.eoffset;
 294                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 295                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 296                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 297                                  sfi->fileIdent +
 298                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 299                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 300                         brelse(dbh);
 301                         return NULL;
 302                 }
 303         }
 304         mark_buffer_dirty_inode(dbh, inode);
 305
 306         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 307                 iinfo->i_lenAlloc);
 308         iinfo->i_lenAlloc = 0;
 309         eloc.logicalBlockNum = *block;
 310         eloc.partitionReferenceNum =
 311                                 iinfo->i_location.partitionReferenceNum;
 312         iinfo->i_lenExtents = inode->i_size;
 313         epos.bh = NULL;
 314         epos.block = iinfo->i_location;
 315         epos.offset = udf_file_entry_alloc_offset(inode);
 316         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 317         /* UniqueID stuff */
 318
 319         brelse(epos.bh);
 320         mark_inode_dirty(inode);
 321         return dbh;
 322 }
 323
 324 static int udf_get_block(struct inode *inode, sector_t block,
 325                          struct buffer_head *bh_result, int create)
 326 {
 327         int err, new;
 328         sector_t phys = 0;
 329         struct udf_inode_info *iinfo;
 330
 331         if (!create) {
 332                 phys = udf_block_map(inode, block);
 333                 if (phys)
 334                         map_bh(bh_result, inode->i_sb, phys);
 335                 return 0;
 336         }
 337
 338         err = -EIO;
 339         new = 0;
 340         iinfo = UDF_I(inode);
 341
 342         down_write(&iinfo->i_data_sem);
 343         if (block == iinfo->i_next_alloc_block + 1) {
 344                 iinfo->i_next_alloc_block++;
 345                 iinfo->i_next_alloc_goal++;
 346         }
 347
 348
 349         phys = inode_getblk(inode, block, &err, &new);
 350         if (!phys)
 351                 goto abort;
 352
 353         if (new)
 354                 set_buffer_new(bh_result);
 355         map_bh(bh_result, inode->i_sb, phys);
 356
 357 abort:
 358         up_write(&iinfo->i_data_sem);
 359         return err;
 360 }
 361
 362 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 363                                       int create, int *err)
 364 {
 365         struct buffer_head *bh;
 366         struct buffer_head dummy;
 367
 368         dummy.b_state = 0;
 369         dummy.b_blocknr = -1000;
 370         *err = udf_get_block(inode, block, &dummy, create);
 371         if (!*err && buffer_mapped(&dummy)) {
 372                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 373                 if (buffer_new(&dummy)) {
 374                         lock_buffer(bh);
 375                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 376                         set_buffer_uptodate(bh);
 377                         unlock_buffer(bh);
 378                         mark_buffer_dirty_inode(bh, inode);
 379                 }
 380                 return bh;
 381         }
 382
 383         return NULL;
 384 }
 385
 386 /* Extend the file by 'blocks' blocks, return the number of extents added */
 387 static int udf_do_extend_file(struct inode *inode,
 388                               struct extent_position *last_pos,
 389                               struct kernel_long_ad *last_ext,
 390                               sector_t blocks)
 391 {
 392         sector_t add;
 393         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 394         struct super_block *sb = inode->i_sb;
 395         struct kernel_lb_addr prealloc_loc = {};
 396         int prealloc_len = 0;
 397         struct udf_inode_info *iinfo;
 398         int err;
 399
 400         /* The previous extent is fake and we should not extend by anything
 401          * - there's nothing to do... */
 402         if (!blocks && fake)
 403                 return 0;
 404
 405         iinfo = UDF_I(inode);
 406         /* Round the last extent up to a multiple of block size */
 407         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 408                 last_ext->extLength =
 409                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 410                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 411                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 412                 iinfo->i_lenExtents =
 413                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 414                         ~(sb->s_blocksize - 1);
 415         }
 416
 417         /* Last extent are just preallocated blocks? */
 418         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 419                                                 EXT_NOT_RECORDED_ALLOCATED) {
 420                 /* Save the extent so that we can reattach it to the end */
 421                 prealloc_loc = last_ext->extLocation;
 422                 prealloc_len = last_ext->extLength;
 423                 /* Mark the extent as a hole */
 424                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 425                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 426                 last_ext->extLocation.logicalBlockNum = 0;
 427                 last_ext->extLocation.partitionReferenceNum = 0;
 428         }
 429
 430         /* Can we merge with the previous extent? */
 431         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 432                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 433                 add = ((1 << 30) - sb->s_blocksize -
 434                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 435                         sb->s_blocksize_bits;
 436                 if (add > blocks)
 437                         add = blocks;
 438                 blocks -= add;
 439                 last_ext->extLength += add << sb->s_blocksize_bits;
 440         }
 441
 442         if (fake) {
 443                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 444                              last_ext->extLength, 1);
 445                 count++;
 446         } else
 447                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 448                                 last_ext->extLength, 1);
 449
 450         /* Managed to do everything necessary? */
 451         if (!blocks)
 452                 goto out;
 453
 454         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 455         last_ext->extLocation.logicalBlockNum = 0;
 456         last_ext->extLocation.partitionReferenceNum = 0;
 457         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 458         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 459                                 (add << sb->s_blocksize_bits);
 460
 461         /* Create enough extents to cover the whole hole */
 462         while (blocks > add) {
 463                 blocks -= add;
 464                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 465                                    last_ext->extLength, 1);
 466                 if (err)
 467                         return err;
 468                 count++;
 469         }
 470         if (blocks) {
 471                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 472                         (blocks << sb->s_blocksize_bits);
 473                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 474                                    last_ext->extLength, 1);
 475                 if (err)
 476                         return err;
 477                 count++;
 478         }
 479
 480 out:
 481         /* Do we have some preallocated blocks saved? */
 482         if (prealloc_len) {
 483                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 484                                    prealloc_len, 1);
 485                 if (err)
 486                         return err;
 487                 last_ext->extLocation = prealloc_loc;
 488                 last_ext->extLength = prealloc_len;
 489                 count++;
 490         }
 491
 492         /* last_pos should point to the last written extent... */
 493         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 494                 last_pos->offset -= sizeof(struct short_ad);
 495         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 496                 last_pos->offset -= sizeof(struct long_ad);
 497         else
 498                 return -EIO;
 499
 500         return count;
 501 }
 502
 503 static int udf_extend_file(struct inode *inode, loff_t newsize)
 504 {
 505
 506         struct extent_position epos;
 507         struct kernel_lb_addr eloc;
 508         uint32_t elen;
 509         int8_t etype;
 510         struct super_block *sb = inode->i_sb;
 511         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 512         int adsize;
 513         struct udf_inode_info *iinfo = UDF_I(inode);
 514         struct kernel_long_ad extent;
 515         int err;
 516
 517         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 518                 adsize = sizeof(struct short_ad);
 519         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 520                 adsize = sizeof(struct long_ad);
 521         else
 522                 BUG();
 523
 524         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 525
 526         /* File has extent covering the new size (could happen when extending
 527          * inside a block)? */
 528         if (etype != -1)
 529                 return 0;
 530         if (newsize & (sb->s_blocksize - 1))
 531                 offset++;
 532         /* Extended file just to the boundary of the last file block? */
 533         if (offset == 0)
 534                 return 0;
 535
 536         /* Truncate is extending the file by 'offset' blocks */
 537         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 538             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 539                 /* File has no extents at all or has empty last
 540                  * indirect extent! Create a fake extent... */
 541                 extent.extLocation.logicalBlockNum = 0;
 542                 extent.extLocation.partitionReferenceNum = 0;
 543                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 544         } else {
 545                 epos.offset -= adsize;
 546                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 547                                       &extent.extLength, 0);
 548                 extent.extLength |= etype << 30;
 549         }
 550         err = udf_do_extend_file(inode, &epos, &extent, offset);
 551         if (err < 0)
 552                 goto out;
 553         err = 0;
 554         iinfo->i_lenExtents = newsize;
 555 out:
 556         brelse(epos.bh);
 557         return err;
 558 }
 559
 560 static sector_t inode_getblk(struct inode *inode, sector_t block,
 561                              int *err, int *new)
 562 {
 563         static sector_t last_block;
 564         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 565         struct extent_position prev_epos, cur_epos, next_epos;
 566         int count = 0, startnum = 0, endnum = 0;
 567         uint32_t elen = 0, tmpelen;
 568         struct kernel_lb_addr eloc, tmpeloc;
 569         int c = 1;
 570         loff_t lbcount = 0, b_off = 0;
 571         uint32_t newblocknum, newblock;
 572         sector_t offset = 0;
 573         int8_t etype;
 574         struct udf_inode_info *iinfo = UDF_I(inode);
 575         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 576         int lastblock = 0;
 577
 578         *err = 0;
 579         *new = 0;
 580         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 581         prev_epos.block = iinfo->i_location;
 582         prev_epos.bh = NULL;
 583         cur_epos = next_epos = prev_epos;
 584         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 585
 586         /* find the extent which contains the block we are looking for.
 587            alternate between laarr[0] and laarr[1] for locations of the
 588            current extent, and the previous extent */
 589         do {
 590                 if (prev_epos.bh != cur_epos.bh) {
 591                         brelse(prev_epos.bh);
 592                         get_bh(cur_epos.bh);
 593                         prev_epos.bh = cur_epos.bh;
 594                 }
 595                 if (cur_epos.bh != next_epos.bh) {
 596                         brelse(cur_epos.bh);
 597                         get_bh(next_epos.bh);
 598                         cur_epos.bh = next_epos.bh;
 599                 }
 600
 601                 lbcount += elen;
 602
 603                 prev_epos.block = cur_epos.block;
 604                 cur_epos.block = next_epos.block;
 605
 606                 prev_epos.offset = cur_epos.offset;
 607                 cur_epos.offset = next_epos.offset;
 608
 609                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 610                 if (etype == -1)
 611                         break;
 612
 613                 c = !c;
 614
 615                 laarr[c].extLength = (etype << 30) | elen;
 616                 laarr[c].extLocation = eloc;
 617
 618                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 619                         pgoal = eloc.logicalBlockNum +
 620                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 621                                  inode->i_sb->s_blocksize_bits);
 622
 623                 count++;
 624         } while (lbcount + elen <= b_off);
 625
 626         b_off -= lbcount;
 627         offset = b_off >> inode->i_sb->s_blocksize_bits;
 628         /*
 629          * Move prev_epos and cur_epos into indirect extent if we are at
 630          * the pointer to it
 631          */
 632         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 633         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 634
 635         /* if the extent is allocated and recorded, return the block
 636            if the extent is not a multiple of the blocksize, round up */
 637
 638         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 639                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 640                         elen = EXT_RECORDED_ALLOCATED |
 641                                 ((elen + inode->i_sb->s_blocksize - 1) &
 642                                  ~(inode->i_sb->s_blocksize - 1));
 643                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 644                 }
 645                 brelse(prev_epos.bh);
 646                 brelse(cur_epos.bh);
 647                 brelse(next_epos.bh);
 648                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 649                 return newblock;
 650         }
 651
 652         last_block = block;
 653         /* Are we beyond EOF? */
 654         if (etype == -1) {
 655                 int ret;
 656
 657                 if (count) {
 658                         if (c)
 659                                 laarr[0] = laarr[1];
 660                         startnum = 1;
 661                 } else {
 662                         /* Create a fake extent when there's not one */
 663                         memset(&laarr[0].extLocation, 0x00,
 664                                 sizeof(struct kernel_lb_addr));
 665                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 666                         /* Will udf_do_extend_file() create real extent from
 667                            a fake one? */
 668                         startnum = (offset > 0);
 669                 }
 670                 /* Create extents for the hole between EOF and offset */
 671                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 672                 if (ret < 0) {
 673                         brelse(prev_epos.bh);
 674                         brelse(cur_epos.bh);
 675                         brelse(next_epos.bh);
 676                         *err = ret;
 677                         return 0;
 678                 }
 679                 c = 0;
 680                 offset = 0;
 681                 count += ret;
 682                 /* We are not covered by a preallocated extent? */
 683                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 684                                                 EXT_NOT_RECORDED_ALLOCATED) {
 685                         /* Is there any real extent? - otherwise we overwrite
 686                          * the fake one... */
 687                         if (count)
 688                                 c = !c;
 689                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 690                                 inode->i_sb->s_blocksize;
 691                         memset(&laarr[c].extLocation, 0x00,
 692                                 sizeof(struct kernel_lb_addr));
 693                         count++;
 694                         endnum++;
 695                 }
 696                 endnum = c + 1;
 697                 lastblock = 1;
 698         } else {
 699                 endnum = startnum = ((count > 2) ? 2 : count);
 700
 701                 /* if the current extent is in position 0,
 702                    swap it with the previous */
 703                 if (!c && count != 1) {
 704                         laarr[2] = laarr[0];
 705                         laarr[0] = laarr[1];
 706                         laarr[1] = laarr[2];
 707                         c = 1;
 708                 }
 709
 710                 /* if the current block is located in an extent,
 711                    read the next extent */
 712                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 713                 if (etype != -1) {
 714                         laarr[c + 1].extLength = (etype << 30) | elen;
 715                         laarr[c + 1].extLocation = eloc;
 716                         count++;
 717                         startnum++;
 718                         endnum++;
 719                 } else
 720                         lastblock = 1;
 721         }
 722
 723         /* if the current extent is not recorded but allocated, get the
 724          * block in the extent corresponding to the requested block */
 725         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 726                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 727         else { /* otherwise, allocate a new block */
 728                 if (iinfo->i_next_alloc_block == block)
 729                         goal = iinfo->i_next_alloc_goal;
 730
 731                 if (!goal) {
 732                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 733                                 goal = iinfo->i_location.logicalBlockNum + 1;
 734                 }
 735
 736                 newblocknum = udf_new_block(inode->i_sb, inode,
 737                                 iinfo->i_location.partitionReferenceNum,
 738                                 goal, err);
 739                 if (!newblocknum) {
 740                         brelse(prev_epos.bh);
 741                         *err = -ENOSPC;
 742                         return 0;
 743                 }
 744                 iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 745         }
 746
 747         /* if the extent the requsted block is located in contains multiple
 748          * blocks, split the extent into at most three extents. blocks prior
 749          * to requested block, requested block, and blocks after requested
 750          * block */
 751         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 752
 753 #ifdef UDF_PREALLOCATE
 754         /* We preallocate blocks only for regular files. It also makes sense
 755          * for directories but there's a problem when to drop the
 756          * preallocation. We might use some delayed work for that but I feel
 757          * it's overengineering for a filesystem like UDF. */
 758         if (S_ISREG(inode->i_mode))
 759                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 760 #endif
 761
 762         /* merge any continuous blocks in laarr */
 763         udf_merge_extents(inode, laarr, &endnum);
 764
 765         /* write back the new extents, inserting new extents if the new number
 766          * of extents is greater than the old number, and deleting extents if
 767          * the new number of extents is less than the old number */
 768         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 769
 770         brelse(prev_epos.bh);
 771
 772         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 773                                 iinfo->i_location.partitionReferenceNum, 0);
 774         if (!newblock) {
 775                 *err = -EIO;
 776                 return 0;
 777         }
 778         *new = 1;
 779         iinfo->i_next_alloc_block = block;
 780         iinfo->i_next_alloc_goal = newblocknum;
 781         inode->i_ctime = current_fs_time(inode->i_sb);
 782
 783         if (IS_SYNC(inode))
 784                 udf_sync_inode(inode);
 785         else
 786                 mark_inode_dirty(inode);
 787
 788         return newblock;
 789 }
 790
 791 static void udf_split_extents(struct inode *inode, int *c, int offset,
 792                               int newblocknum,
 793                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 794                               int *endnum)
 795 {
 796         unsigned long blocksize = inode->i_sb->s_blocksize;
 797         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 798
 799         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 800             (laarr[*c].extLength >> 30) ==
 801                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 802                 int curr = *c;
 803                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 804                             blocksize - 1) >> blocksize_bits;
 805                 int8_t etype = (laarr[curr].extLength >> 30);
 806
 807                 if (blen == 1)
 808                         ;
 809                 else if (!offset || blen == offset + 1) {
 810                         laarr[curr + 2] = laarr[curr + 1];
 811                         laarr[curr + 1] = laarr[curr];
 812                 } else {
 813                         laarr[curr + 3] = laarr[curr + 1];
 814                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 815                 }
 816
 817                 if (offset) {
 818                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 819                                 udf_free_blocks(inode->i_sb, inode,
 820                                                 &laarr[curr].extLocation,
 821                                                 0, offset);
 822                                 laarr[curr].extLength =
 823                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 824                                         (offset << blocksize_bits);
 825                                 laarr[curr].extLocation.logicalBlockNum = 0;
 826                                 laarr[curr].extLocation.
 827                                                 partitionReferenceNum = 0;
 828                         } else
 829                                 laarr[curr].extLength = (etype << 30) |
 830                                         (offset << blocksize_bits);
 831                         curr++;
 832                         (*c)++;
 833                         (*endnum)++;
 834                 }
 835
 836                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 837                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 838                         laarr[curr].extLocation.partitionReferenceNum =
 839                                 UDF_I(inode)->i_location.partitionReferenceNum;
 840                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 841                         blocksize;
 842                 curr++;
 843
 844                 if (blen != offset + 1) {
 845                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 846                                 laarr[curr].extLocation.logicalBlockNum +=
 847                                                                 offset + 1;
 848                         laarr[curr].extLength = (etype << 30) |
 849                                 ((blen - (offset + 1)) << blocksize_bits);
 850                         curr++;
 851                         (*endnum)++;
 852                 }
 853         }
 854 }
 855
 856 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 857                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 858                                  int *endnum)
 859 {
 860         int start, length = 0, currlength = 0, i;
 861
 862         if (*endnum >= (c + 1)) {
 863                 if (!lastblock)
 864                         return;
 865                 else
 866                         start = c;
 867         } else {
 868                 if ((laarr[c + 1].extLength >> 30) ==
 869                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 870                         start = c + 1;
 871                         length = currlength =
 872                                 (((laarr[c + 1].extLength &
 873                                         UDF_EXTENT_LENGTH_MASK) +
 874                                 inode->i_sb->s_blocksize - 1) >>
 875                                 inode->i_sb->s_blocksize_bits);
 876                 } else
 877                         start = c;
 878         }
 879
 880         for (i = start + 1; i <= *endnum; i++) {
 881                 if (i == *endnum) {
 882                         if (lastblock)
 883                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 884                 } else if ((laarr[i].extLength >> 30) ==
 885                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 886                         length += (((laarr[i].extLength &
 887                                                 UDF_EXTENT_LENGTH_MASK) +
 888                                     inode->i_sb->s_blocksize - 1) >>
 889                                     inode->i_sb->s_blocksize_bits);
 890                 } else
 891                         break;
 892         }
 893
 894         if (length) {
 895                 int next = laarr[start].extLocation.logicalBlockNum +
 896                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
 897                           inode->i_sb->s_blocksize - 1) >>
 898                           inode->i_sb->s_blocksize_bits);
 899                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
 900                                 laarr[start].extLocation.partitionReferenceNum,
 901                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
 902                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
 903                                 currlength);
 904                 if (numalloc)   {
 905                         if (start == (c + 1))
 906                                 laarr[start].extLength +=
 907                                         (numalloc <<
 908                                          inode->i_sb->s_blocksize_bits);
 909                         else {
 910                                 memmove(&laarr[c + 2], &laarr[c + 1],
 911                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
 912                                 (*endnum)++;
 913                                 laarr[c + 1].extLocation.logicalBlockNum = next;
 914                                 laarr[c + 1].extLocation.partitionReferenceNum =
 915                                         laarr[c].extLocation.
 916                                                         partitionReferenceNum;
 917                                 laarr[c + 1].extLength =
 918                                         EXT_NOT_RECORDED_ALLOCATED |
 919                                         (numalloc <<
 920                                          inode->i_sb->s_blocksize_bits);
 921                                 start = c + 1;
 922                         }
 923
 924                         for (i = start + 1; numalloc && i < *endnum; i++) {
 925                                 int elen = ((laarr[i].extLength &
 926                                                 UDF_EXTENT_LENGTH_MASK) +
 927                                             inode->i_sb->s_blocksize - 1) >>
 928                                             inode->i_sb->s_blocksize_bits;
 929
 930                                 if (elen > numalloc) {
 931                                         laarr[i].extLength -=
 932                                                 (numalloc <<
 933                                                  inode->i_sb->s_blocksize_bits);
 934                                         numalloc = 0;
 935                                 } else {
 936                                         numalloc -= elen;
 937                                         if (*endnum > (i + 1))
 938                                                 memmove(&laarr[i],
 939                                                         &laarr[i + 1],
 940                                                         sizeof(struct long_ad) *
 941                                                         (*endnum - (i + 1)));
 942                                         i--;
 943                                         (*endnum)--;
 944                                 }
 945                         }
 946                         UDF_I(inode)->i_lenExtents +=
 947                                 numalloc << inode->i_sb->s_blocksize_bits;
 948                 }
 949         }
 950 }
 951
 952 static void udf_merge_extents(struct inode *inode,
 953                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 954                               int *endnum)
 955 {
 956         int i;
 957         unsigned long blocksize = inode->i_sb->s_blocksize;
 958         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 959
 960         for (i = 0; i < (*endnum - 1); i++) {
 961                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
 962                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
 963
 964                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
 965                         (((li->extLength >> 30) ==
 966                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
 967                         ((lip1->extLocation.logicalBlockNum -
 968                           li->extLocation.logicalBlockNum) ==
 969                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 970                         blocksize - 1) >> blocksize_bits)))) {
 971
 972                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
 973                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
 974                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
 975                                 lip1->extLength = (lip1->extLength -
 976                                                   (li->extLength &
 977                                                    UDF_EXTENT_LENGTH_MASK) +
 978                                                    UDF_EXTENT_LENGTH_MASK) &
 979                                                         ~(blocksize - 1);
 980                                 li->extLength = (li->extLength &
 981                                                  UDF_EXTENT_FLAG_MASK) +
 982                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
 983                                                 blocksize;
 984                                 lip1->extLocation.logicalBlockNum =
 985                                         li->extLocation.logicalBlockNum +
 986                                         ((li->extLength &
 987                                                 UDF_EXTENT_LENGTH_MASK) >>
 988                                                 blocksize_bits);
 989                         } else {
 990                                 li->extLength = lip1->extLength +
 991                                         (((li->extLength &
 992                                                 UDF_EXTENT_LENGTH_MASK) +
 993                                          blocksize - 1) & ~(blocksize - 1));
 994                                 if (*endnum > (i + 2))
 995                                         memmove(&laarr[i + 1], &laarr[i + 2],
 996                                                 sizeof(struct long_ad) *
 997                                                 (*endnum - (i + 2)));
 998                                 i--;
 999                                 (*endnum)--;
1000                         }
1001                 } else if (((li->extLength >> 30) ==
1002                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1003                            ((lip1->extLength >> 30) ==
1004                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1005                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1006                                         ((li->extLength &
1007                                           UDF_EXTENT_LENGTH_MASK) +
1008                                          blocksize - 1) >> blocksize_bits);
1009                         li->extLocation.logicalBlockNum = 0;
1010                         li->extLocation.partitionReferenceNum = 0;
1011
1012                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1013                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1014                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1015                                 lip1->extLength = (lip1->extLength -
1016                                                    (li->extLength &
1017                                                    UDF_EXTENT_LENGTH_MASK) +
1018                                                    UDF_EXTENT_LENGTH_MASK) &
1019                                                    ~(blocksize - 1);
1020                                 li->extLength = (li->extLength &
1021                                                  UDF_EXTENT_FLAG_MASK) +
1022                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1023                                                 blocksize;
1024                         } else {
1025                                 li->extLength = lip1->extLength +
1026                                         (((li->extLength &
1027                                                 UDF_EXTENT_LENGTH_MASK) +
1028                                           blocksize - 1) & ~(blocksize - 1));
1029                                 if (*endnum > (i + 2))
1030                                         memmove(&laarr[i + 1], &laarr[i + 2],
1031                                                 sizeof(struct long_ad) *
1032                                                 (*endnum - (i + 2)));
1033                                 i--;
1034                                 (*endnum)--;
1035                         }
1036                 } else if ((li->extLength >> 30) ==
1037                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1038                         udf_free_blocks(inode->i_sb, inode,
1039                                         &li->extLocation, 0,
1040                                         ((li->extLength &
1041                                                 UDF_EXTENT_LENGTH_MASK) +
1042                                          blocksize - 1) >> blocksize_bits);
1043                         li->extLocation.logicalBlockNum = 0;
1044                         li->extLocation.partitionReferenceNum = 0;
1045                         li->extLength = (li->extLength &
1046                                                 UDF_EXTENT_LENGTH_MASK) |
1047                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1048                 }
1049         }
1050 }
1051
1052 static void udf_update_extents(struct inode *inode,
1053                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1054                                int startnum, int endnum,
1055                                struct extent_position *epos)
1056 {
1057         int start = 0, i;
1058         struct kernel_lb_addr tmploc;
1059         uint32_t tmplen;
1060
1061         if (startnum > endnum) {
1062                 for (i = 0; i < (startnum - endnum); i++)
1063                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1064                                         laarr[i].extLength);
1065         } else if (startnum < endnum) {
1066                 for (i = 0; i < (endnum - startnum); i++) {
1067                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1068                                         laarr[i].extLength);
1069                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1070                                       &laarr[i].extLength, 1);
1071                         start++;
1072                 }
1073         }
1074
1075         for (i = start; i < endnum; i++) {
1076                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1077                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1078                                laarr[i].extLength, 1);
1079         }
1080 }
1081
1082 struct buffer_head *udf_bread(struct inode *inode, int block,
1083                               int create, int *err)
1084 {
1085         struct buffer_head *bh = NULL;
1086
1087         bh = udf_getblk(inode, block, create, err);
1088         if (!bh)
1089                 return NULL;
1090
1091         if (buffer_uptodate(bh))
1092                 return bh;
1093
1094         ll_rw_block(READ, 1, &bh);
1095
1096         wait_on_buffer(bh);
1097         if (buffer_uptodate(bh))
1098                 return bh;
1099
1100         brelse(bh);
1101         *err = -EIO;
1102         return NULL;
1103 }
1104
1105 int udf_setsize(struct inode *inode, loff_t newsize)
1106 {
1107         int err;
1108         struct udf_inode_info *iinfo;
1109         int bsize = 1 << inode->i_blkbits;
1110
1111         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1112               S_ISLNK(inode->i_mode)))
1113                 return -EINVAL;
1114         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1115                 return -EPERM;
1116
1117         iinfo = UDF_I(inode);
1118         if (newsize > inode->i_size) {
1119                 down_write(&iinfo->i_data_sem);
1120                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1121                         if (bsize <
1122                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1123                                 err = udf_expand_file_adinicb(inode);
1124                                 if (err)
1125                                         return err;
1126                                 down_write(&iinfo->i_data_sem);
1127                         } else {
1128                                 iinfo->i_lenAlloc = newsize;
1129                                 goto set_size;
1130                         }
1131                 }
1132                 err = udf_extend_file(inode, newsize);
1133                 if (err) {
1134                         up_write(&iinfo->i_data_sem);
1135                         return err;
1136                 }
1137 set_size:
1138                 truncate_setsize(inode, newsize);
1139                 up_write(&iinfo->i_data_sem);
1140         } else {
1141                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1142                         down_write(&iinfo->i_data_sem);
1143                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1144                                0x00, bsize - newsize -
1145                                udf_file_entry_alloc_offset(inode));
1146                         iinfo->i_lenAlloc = newsize;
1147                         truncate_setsize(inode, newsize);
1148                         up_write(&iinfo->i_data_sem);
1149                         goto update_time;
1150                 }
1151                 err = block_truncate_page(inode->i_mapping, newsize,
1152                                           udf_get_block);
1153                 if (err)
1154                         return err;
1155                 down_write(&iinfo->i_data_sem);
1156                 truncate_setsize(inode, newsize);
1157                 udf_truncate_extents(inode);
1158                 up_write(&iinfo->i_data_sem);
1159         }
1160 update_time:
1161         inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
1162         if (IS_SYNC(inode))
1163                 udf_sync_inode(inode);
1164         else
1165                 mark_inode_dirty(inode);
1166         return 0;
1167 }
1168
1169 static void __udf_read_inode(struct inode *inode)
1170 {
1171         struct buffer_head *bh = NULL;
1172         struct fileEntry *fe;
1173         uint16_t ident;
1174         struct udf_inode_info *iinfo = UDF_I(inode);
1175
1176         /*
1177          * Set defaults, but the inode is still incomplete!
1178          * Note: get_new_inode() sets the following on a new inode:
1179          *      i_sb = sb
1180          *      i_no = ino
1181          *      i_flags = sb->s_flags
1182          *      i_state = 0
1183          * clean_inode(): zero fills and sets
1184          *      i_count = 1
1185          *      i_nlink = 1
1186          *      i_op = NULL;
1187          */
1188         bh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 0, &ident);
1189         if (!bh) {
1190                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1191                 make_bad_inode(inode);
1192                 return;
1193         }
1194
1195         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1196             ident != TAG_IDENT_USE) {
1197                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1198                         inode->i_ino, ident);
1199                 brelse(bh);
1200                 make_bad_inode(inode);
1201                 return;
1202         }
1203
1204         fe = (struct fileEntry *)bh->b_data;
1205
1206         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1207                 struct buffer_head *ibh;
1208
1209                 ibh = udf_read_ptagged(inode->i_sb, &iinfo->i_location, 1,
1210                                         &ident);
1211                 if (ident == TAG_IDENT_IE && ibh) {
1212                         struct buffer_head *nbh = NULL;
1213                         struct kernel_lb_addr loc;
1214                         struct indirectEntry *ie;
1215
1216                         ie = (struct indirectEntry *)ibh->b_data;
1217                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1218
1219                         if (ie->indirectICB.extLength &&
1220                                 (nbh = udf_read_ptagged(inode->i_sb, &loc, 0,
1221                                                         &ident))) {
1222                                 if (ident == TAG_IDENT_FE ||
1223                                         ident == TAG_IDENT_EFE) {
1224                                         memcpy(&iinfo->i_location,
1225                                                 &loc,
1226                                                 sizeof(struct kernel_lb_addr));
1227                                         brelse(bh);
1228                                         brelse(ibh);
1229                                         brelse(nbh);
1230                                         __udf_read_inode(inode);
1231                                         return;
1232                                 }
1233                                 brelse(nbh);
1234                         }
1235                 }
1236                 brelse(ibh);
1237         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1238                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1239                         le16_to_cpu(fe->icbTag.strategyType));
1240                 brelse(bh);
1241                 make_bad_inode(inode);
1242                 return;
1243         }
1244         udf_fill_inode(inode, bh);
1245
1246         brelse(bh);
1247 }
1248
1249 static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
1250 {
1251         struct fileEntry *fe;
1252         struct extendedFileEntry *efe;
1253         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1254         struct udf_inode_info *iinfo = UDF_I(inode);
1255         unsigned int link_count;
1256
1257         fe = (struct fileEntry *)bh->b_data;
1258         efe = (struct extendedFileEntry *)bh->b_data;
1259
1260         if (fe->icbTag.strategyType == cpu_to_le16(4))
1261                 iinfo->i_strat4096 = 0;
1262         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1263                 iinfo->i_strat4096 = 1;
1264
1265         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1266                                                         ICBTAG_FLAG_AD_MASK;
1267         iinfo->i_unique = 0;
1268         iinfo->i_lenEAttr = 0;
1269         iinfo->i_lenExtents = 0;
1270         iinfo->i_lenAlloc = 0;
1271         iinfo->i_next_alloc_block = 0;
1272         iinfo->i_next_alloc_goal = 0;
1273         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1274                 iinfo->i_efe = 1;
1275                 iinfo->i_use = 0;
1276                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1277                                         sizeof(struct extendedFileEntry))) {
1278                         make_bad_inode(inode);
1279                         return;
1280                 }
1281                 memcpy(iinfo->i_ext.i_data,
1282                        bh->b_data + sizeof(struct extendedFileEntry),
1283                        inode->i_sb->s_blocksize -
1284                                         sizeof(struct extendedFileEntry));
1285         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1286                 iinfo->i_efe = 0;
1287                 iinfo->i_use = 0;
1288                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1289                                                 sizeof(struct fileEntry))) {
1290                         make_bad_inode(inode);
1291                         return;
1292                 }
1293                 memcpy(iinfo->i_ext.i_data,
1294                        bh->b_data + sizeof(struct fileEntry),
1295                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1296         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1297                 iinfo->i_efe = 0;
1298                 iinfo->i_use = 1;
1299                 iinfo->i_lenAlloc = le32_to_cpu(
1300                                 ((struct unallocSpaceEntry *)bh->b_data)->
1301                                  lengthAllocDescs);
1302                 if (udf_alloc_i_data(inode, inode->i_sb->s_blocksize -
1303                                         sizeof(struct unallocSpaceEntry))) {
1304                         make_bad_inode(inode);
1305                         return;
1306                 }
1307                 memcpy(iinfo->i_ext.i_data,
1308                        bh->b_data + sizeof(struct unallocSpaceEntry),
1309                        inode->i_sb->s_blocksize -
1310                                         sizeof(struct unallocSpaceEntry));
1311                 return;
1312         }
1313
1314         read_lock(&sbi->s_cred_lock);
1315         inode->i_uid = le32_to_cpu(fe->uid);
1316         if (inode->i_uid == -1 ||
1317             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1318             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1319                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1320
1321         inode->i_gid = le32_to_cpu(fe->gid);
1322         if (inode->i_gid == -1 ||
1323             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1324             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1325                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1326
1327         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1328                         sbi->s_fmode != UDF_INVALID_MODE)
1329                 inode->i_mode = sbi->s_fmode;
1330         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1331                         sbi->s_dmode != UDF_INVALID_MODE)
1332                 inode->i_mode = sbi->s_dmode;
1333         else
1334                 inode->i_mode = udf_convert_permissions(fe);
1335         inode->i_mode &= ~sbi->s_umask;
1336         read_unlock(&sbi->s_cred_lock);
1337
1338         link_count = le16_to_cpu(fe->fileLinkCount);
1339         if (!link_count)
1340                 link_count = 1;
1341         set_nlink(inode, link_count);
1342
1343         inode->i_size = le64_to_cpu(fe->informationLength);
1344         iinfo->i_lenExtents = inode->i_size;
1345
1346         if (iinfo->i_efe == 0) {
1347                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1348                         (inode->i_sb->s_blocksize_bits - 9);
1349
1350                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1351                         inode->i_atime = sbi->s_record_time;
1352
1353                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1354                                             fe->modificationTime))
1355                         inode->i_mtime = sbi->s_record_time;
1356
1357                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1358                         inode->i_ctime = sbi->s_record_time;
1359
1360                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1361                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1362                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1363                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1364         } else {
1365                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1366                     (inode->i_sb->s_blocksize_bits - 9);
1367
1368                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1369                         inode->i_atime = sbi->s_record_time;
1370
1371                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1372                                             efe->modificationTime))
1373                         inode->i_mtime = sbi->s_record_time;
1374
1375                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1376                         iinfo->i_crtime = sbi->s_record_time;
1377
1378                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1379                         inode->i_ctime = sbi->s_record_time;
1380
1381                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1382                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1383                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1384                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1385         }
1386
1387         switch (fe->icbTag.fileType) {
1388         case ICBTAG_FILE_TYPE_DIRECTORY:
1389                 inode->i_op = &udf_dir_inode_operations;
1390                 inode->i_fop = &udf_dir_operations;
1391                 inode->i_mode |= S_IFDIR;
1392                 inc_nlink(inode);
1393                 break;
1394         case ICBTAG_FILE_TYPE_REALTIME:
1395         case ICBTAG_FILE_TYPE_REGULAR:
1396         case ICBTAG_FILE_TYPE_UNDEF:
1397         case ICBTAG_FILE_TYPE_VAT20:
1398                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1399                         inode->i_data.a_ops = &udf_adinicb_aops;
1400                 else
1401                         inode->i_data.a_ops = &udf_aops;
1402                 inode->i_op = &udf_file_inode_operations;
1403                 inode->i_fop = &udf_file_operations;
1404                 inode->i_mode |= S_IFREG;
1405                 break;
1406         case ICBTAG_FILE_TYPE_BLOCK:
1407                 inode->i_mode |= S_IFBLK;
1408                 break;
1409         case ICBTAG_FILE_TYPE_CHAR:
1410                 inode->i_mode |= S_IFCHR;
1411                 break;
1412         case ICBTAG_FILE_TYPE_FIFO:
1413                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1414                 break;
1415         case ICBTAG_FILE_TYPE_SOCKET:
1416                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1417                 break;
1418         case ICBTAG_FILE_TYPE_SYMLINK:
1419                 inode->i_data.a_ops = &udf_symlink_aops;
1420                 inode->i_op = &udf_symlink_inode_operations;
1421                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1422                 break;
1423         case ICBTAG_FILE_TYPE_MAIN:
1424                 udf_debug("METADATA FILE-----\n");
1425                 break;
1426         case ICBTAG_FILE_TYPE_MIRROR:
1427                 udf_debug("METADATA MIRROR FILE-----\n");
1428                 break;
1429         case ICBTAG_FILE_TYPE_BITMAP:
1430                 udf_debug("METADATA BITMAP FILE-----\n");
1431                 break;
1432         default:
1433                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1434                         inode->i_ino, fe->icbTag.fileType);
1435                 make_bad_inode(inode);
1436                 return;
1437         }
1438         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1439                 struct deviceSpec *dsea =
1440                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1441                 if (dsea) {
1442                         init_special_inode(inode, inode->i_mode,
1443                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1444                                       le32_to_cpu(dsea->minorDeviceIdent)));
1445                         /* Developer ID ??? */
1446                 } else
1447                         make_bad_inode(inode);
1448         }
1449 }
1450
1451 static int udf_alloc_i_data(struct inode *inode, size_t size)
1452 {
1453         struct udf_inode_info *iinfo = UDF_I(inode);
1454         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1455
1456         if (!iinfo->i_ext.i_data) {
1457                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1458                         inode->i_ino);
1459                 return -ENOMEM;
1460         }
1461
1462         return 0;
1463 }
1464
1465 static umode_t udf_convert_permissions(struct fileEntry *fe)
1466 {
1467         umode_t mode;
1468         uint32_t permissions;
1469         uint32_t flags;
1470
1471         permissions = le32_to_cpu(fe->permissions);
1472         flags = le16_to_cpu(fe->icbTag.flags);
1473
1474         mode =  ((permissions) & S_IRWXO) |
1475                 ((permissions >> 2) & S_IRWXG) |
1476                 ((permissions >> 4) & S_IRWXU) |
1477                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1478                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1479                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1480
1481         return mode;
1482 }
1483
1484 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1485 {
1486         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1487 }
1488
1489 static int udf_sync_inode(struct inode *inode)
1490 {
1491         return udf_update_inode(inode, 1);
1492 }
1493
1494 static int udf_update_inode(struct inode *inode, int do_sync)
1495 {
1496         struct buffer_head *bh = NULL;
1497         struct fileEntry *fe;
1498         struct extendedFileEntry *efe;
1499         uint64_t lb_recorded;
1500         uint32_t udfperms;
1501         uint16_t icbflags;
1502         uint16_t crclen;
1503         int err = 0;
1504         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1505         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1506         struct udf_inode_info *iinfo = UDF_I(inode);
1507
1508         bh = udf_tgetblk(inode->i_sb,
1509                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1510         if (!bh) {
1511                 udf_debug("getblk failure\n");
1512                 return -ENOMEM;
1513         }
1514
1515         lock_buffer(bh);
1516         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1517         fe = (struct fileEntry *)bh->b_data;
1518         efe = (struct extendedFileEntry *)bh->b_data;
1519
1520         if (iinfo->i_use) {
1521                 struct unallocSpaceEntry *use =
1522                         (struct unallocSpaceEntry *)bh->b_data;
1523
1524                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1525                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1526                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1527                                         sizeof(struct unallocSpaceEntry));
1528                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1529                 use->descTag.tagLocation =
1530                                 cpu_to_le32(iinfo->i_location.logicalBlockNum);
1531                 crclen = sizeof(struct unallocSpaceEntry) +
1532                                 iinfo->i_lenAlloc - sizeof(struct tag);
1533                 use->descTag.descCRCLength = cpu_to_le16(crclen);
1534                 use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
1535                                                            sizeof(struct tag),
1536                                                            crclen));
1537                 use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
1538
1539                 goto out;
1540         }
1541
1542         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1543                 fe->uid = cpu_to_le32(-1);
1544         else
1545                 fe->uid = cpu_to_le32(inode->i_uid);
1546
1547         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1548                 fe->gid = cpu_to_le32(-1);
1549         else
1550                 fe->gid = cpu_to_le32(inode->i_gid);
1551
1552         udfperms = ((inode->i_mode & S_IRWXO)) |
1553                    ((inode->i_mode & S_IRWXG) << 2) |
1554                    ((inode->i_mode & S_IRWXU) << 4);
1555
1556         udfperms |= (le32_to_cpu(fe->permissions) &
1557                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1558                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1559                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1560         fe->permissions = cpu_to_le32(udfperms);
1561
1562         if (S_ISDIR(inode->i_mode))
1563                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1564         else
1565                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1566
1567         fe->informationLength = cpu_to_le64(inode->i_size);
1568
1569         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1570                 struct regid *eid;
1571                 struct deviceSpec *dsea =
1572                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1573                 if (!dsea) {
1574                         dsea = (struct deviceSpec *)
1575                                 udf_add_extendedattr(inode,
1576                                                      sizeof(struct deviceSpec) +
1577                                                      sizeof(struct regid), 12, 0x3);
1578                         dsea->attrType = cpu_to_le32(12);
1579                         dsea->attrSubtype = 1;
1580                         dsea->attrLength = cpu_to_le32(
1581                                                 sizeof(struct deviceSpec) +
1582                                                 sizeof(struct regid));
1583                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1584                 }
1585                 eid = (struct regid *)dsea->impUse;
1586                 memset(eid, 0, sizeof(struct regid));
1587                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1588                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1589                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1590                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1591                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1592         }
1593
1594         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1595                 lb_recorded = 0; /* No extents => no blocks! */
1596         else
1597                 lb_recorded =
1598                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1599                         (blocksize_bits - 9);
1600
1601         if (iinfo->i_efe == 0) {
1602                 memcpy(bh->b_data + sizeof(struct fileEntry),
1603                        iinfo->i_ext.i_data,
1604                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1605                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1606
1607                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1608                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1609                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1610                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1611                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1612                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1613                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1614                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1615                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1616                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1617                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1618                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1619                 crclen = sizeof(struct fileEntry);
1620         } else {
1621                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1622                        iinfo->i_ext.i_data,
1623                        inode->i_sb->s_blocksize -
1624                                         sizeof(struct extendedFileEntry));
1625                 efe->objectSize = cpu_to_le64(inode->i_size);
1626                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1627
1628                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1629                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1630                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1631                         iinfo->i_crtime = inode->i_atime;
1632
1633                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1634                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1635                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1636                         iinfo->i_crtime = inode->i_mtime;
1637
1638                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1639                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1640                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1641                         iinfo->i_crtime = inode->i_ctime;
1642
1643                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1644                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1645                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1646                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1647
1648                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1649                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1650                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1651                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1652                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1653                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1654                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1655                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1656                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1657                 crclen = sizeof(struct extendedFileEntry);
1658         }
1659         if (iinfo->i_strat4096) {
1660                 fe->icbTag.strategyType = cpu_to_le16(4096);
1661                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1662                 fe->icbTag.numEntries = cpu_to_le16(2);
1663         } else {
1664                 fe->icbTag.strategyType = cpu_to_le16(4);
1665                 fe->icbTag.numEntries = cpu_to_le16(1);
1666         }
1667
1668         if (S_ISDIR(inode->i_mode))
1669                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1670         else if (S_ISREG(inode->i_mode))
1671                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1672         else if (S_ISLNK(inode->i_mode))
1673                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1674         else if (S_ISBLK(inode->i_mode))
1675                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1676         else if (S_ISCHR(inode->i_mode))
1677                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1678         else if (S_ISFIFO(inode->i_mode))
1679                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1680         else if (S_ISSOCK(inode->i_mode))
1681                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1682
1683         icbflags =      iinfo->i_alloc_type |
1684                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1685                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1686                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1687                         (le16_to_cpu(fe->icbTag.flags) &
1688                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1689                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1690
1691         fe->icbTag.flags = cpu_to_le16(icbflags);
1692         if (sbi->s_udfrev >= 0x0200)
1693                 fe->descTag.descVersion = cpu_to_le16(3);
1694         else
1695                 fe->descTag.descVersion = cpu_to_le16(2);
1696         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1697         fe->descTag.tagLocation = cpu_to_le32(
1698                                         iinfo->i_location.logicalBlockNum);
1699         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1700         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1701         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1702                                                   crclen));
1703         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1704
1705 out:
1706         set_buffer_uptodate(bh);
1707         unlock_buffer(bh);
1708
1709         /* write the data blocks */
1710         mark_buffer_dirty(bh);
1711         if (do_sync) {
1712                 sync_dirty_buffer(bh);
1713                 if (buffer_write_io_error(bh)) {
1714                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1715                                  inode->i_ino);
1716                         err = -EIO;
1717                 }
1718         }
1719         brelse(bh);
1720
1721         return err;
1722 }
1723
1724 struct inode *udf_iget(struct super_block *sb, struct kernel_lb_addr *ino)
1725 {
1726         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1727         struct inode *inode = iget_locked(sb, block);
1728
1729         if (!inode)
1730                 return NULL;
1731
1732         if (inode->i_state & I_NEW) {
1733                 memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1734                 __udf_read_inode(inode);
1735                 unlock_new_inode(inode);
1736         }
1737
1738         if (is_bad_inode(inode))
1739                 goto out_iput;
1740
1741         if (ino->logicalBlockNum >= UDF_SB(sb)->
1742                         s_partmaps[ino->partitionReferenceNum].s_partition_len) {
1743                 udf_debug("block=%d, partition=%d out of range\n",
1744                           ino->logicalBlockNum, ino->partitionReferenceNum);
1745                 make_bad_inode(inode);
1746                 goto out_iput;
1747         }
1748
1749         return inode;
1750
1751  out_iput:
1752         iput(inode);
1753         return NULL;
1754 }
1755
1756 int udf_add_aext(struct inode *inode, struct extent_position *epos,
1757                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1758 {
1759         int adsize;
1760         struct short_ad *sad = NULL;
1761         struct long_ad *lad = NULL;
1762         struct allocExtDesc *aed;
1763         uint8_t *ptr;
1764         struct udf_inode_info *iinfo = UDF_I(inode);
1765
1766         if (!epos->bh)
1767                 ptr = iinfo->i_ext.i_data + epos->offset -
1768                         udf_file_entry_alloc_offset(inode) +
1769                         iinfo->i_lenEAttr;
1770         else
1771                 ptr = epos->bh->b_data + epos->offset;
1772
1773         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1774                 adsize = sizeof(struct short_ad);
1775         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1776                 adsize = sizeof(struct long_ad);
1777         else
1778                 return -EIO;
1779
1780         if (epos->offset + (2 * adsize) > inode->i_sb->s_blocksize) {
1781                 unsigned char *sptr, *dptr;
1782                 struct buffer_head *nbh;
1783                 int err, loffset;
1784                 struct kernel_lb_addr obloc = epos->block;
1785
1786                 epos->block.logicalBlockNum = udf_new_block(inode->i_sb, NULL,
1787                                                 obloc.partitionReferenceNum,
1788                                                 obloc.logicalBlockNum, &err);
1789                 if (!epos->block.logicalBlockNum)
1790                         return -ENOSPC;
1791                 nbh = udf_tgetblk(inode->i_sb, udf_get_lb_pblock(inode->i_sb,
1792                                                                  &epos->block,
1793                                                                  0));
1794                 if (!nbh)
1795                         return -EIO;
1796                 lock_buffer(nbh);
1797                 memset(nbh->b_data, 0x00, inode->i_sb->s_blocksize);
1798                 set_buffer_uptodate(nbh);
1799                 unlock_buffer(nbh);
1800                 mark_buffer_dirty_inode(nbh, inode);
1801
1802                 aed = (struct allocExtDesc *)(nbh->b_data);
1803                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
1804                         aed->previousAllocExtLocation =
1805                                         cpu_to_le32(obloc.logicalBlockNum);
1806                 if (epos->offset + adsize > inode->i_sb->s_blocksize) {
1807                         loffset = epos->offset;
1808                         aed->lengthAllocDescs = cpu_to_le32(adsize);
1809                         sptr = ptr - adsize;
1810                         dptr = nbh->b_data + sizeof(struct allocExtDesc);
1811                         memcpy(dptr, sptr, adsize);
1812                         epos->offset = sizeof(struct allocExtDesc) + adsize;
1813                 } else {
1814                         loffset = epos->offset + adsize;
1815                         aed->lengthAllocDescs = cpu_to_le32(0);
1816                         sptr = ptr;
1817                         epos->offset = sizeof(struct allocExtDesc);
1818
1819                         if (epos->bh) {
1820                                 aed = (struct allocExtDesc *)epos->bh->b_data;
1821                                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1822                         } else {
1823                                 iinfo->i_lenAlloc += adsize;
1824                                 mark_inode_dirty(inode);
1825                         }
1826                 }
1827                 if (UDF_SB(inode->i_sb)->s_udfrev >= 0x0200)
1828                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 3, 1,
1829                                     epos->block.logicalBlockNum, sizeof(struct tag));
1830                 else
1831                         udf_new_tag(nbh->b_data, TAG_IDENT_AED, 2, 1,
1832                                     epos->block.logicalBlockNum, sizeof(struct tag));
1833                 switch (iinfo->i_alloc_type) {
1834                 case ICBTAG_FLAG_AD_SHORT:
1835                         sad = (struct short_ad *)sptr;
1836                         sad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1837                                                      inode->i_sb->s_blocksize);
1838                         sad->extPosition =
1839                                 cpu_to_le32(epos->block.logicalBlockNum);
1840                         break;
1841                 case ICBTAG_FLAG_AD_LONG:
1842                         lad = (struct long_ad *)sptr;
1843                         lad->extLength = cpu_to_le32(EXT_NEXT_EXTENT_ALLOCDECS |
1844                                                      inode->i_sb->s_blocksize);
1845                         lad->extLocation = cpu_to_lelb(epos->block);
1846                         memset(lad->impUse, 0x00, sizeof(lad->impUse));
1847                         break;
1848                 }
1849                 if (epos->bh) {
1850                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1851                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1852                                 udf_update_tag(epos->bh->b_data, loffset);
1853                         else
1854                                 udf_update_tag(epos->bh->b_data,
1855                                                 sizeof(struct allocExtDesc));
1856                         mark_buffer_dirty_inode(epos->bh, inode);
1857                         brelse(epos->bh);
1858                 } else {
1859                         mark_inode_dirty(inode);
1860                 }
1861                 epos->bh = nbh;
1862         }
1863
1864         udf_write_aext(inode, epos, eloc, elen, inc);
1865
1866         if (!epos->bh) {
1867                 iinfo->i_lenAlloc += adsize;
1868                 mark_inode_dirty(inode);
1869         } else {
1870                 aed = (struct allocExtDesc *)epos->bh->b_data;
1871                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1872                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1873                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1874                         udf_update_tag(epos->bh->b_data,
1875                                         epos->offset + (inc ? 0 : adsize));
1876                 else
1877                         udf_update_tag(epos->bh->b_data,
1878                                         sizeof(struct allocExtDesc));
1879                 mark_buffer_dirty_inode(epos->bh, inode);
1880         }
1881
1882         return 0;
1883 }
1884
1885 void udf_write_aext(struct inode *inode, struct extent_position *epos,
1886                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1887 {
1888         int adsize;
1889         uint8_t *ptr;
1890         struct short_ad *sad;
1891         struct long_ad *lad;
1892         struct udf_inode_info *iinfo = UDF_I(inode);
1893
1894         if (!epos->bh)
1895                 ptr = iinfo->i_ext.i_data + epos->offset -
1896                         udf_file_entry_alloc_offset(inode) +
1897                         iinfo->i_lenEAttr;
1898         else
1899                 ptr = epos->bh->b_data + epos->offset;
1900
1901         switch (iinfo->i_alloc_type) {
1902         case ICBTAG_FLAG_AD_SHORT:
1903                 sad = (struct short_ad *)ptr;
1904                 sad->extLength = cpu_to_le32(elen);
1905                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
1906                 adsize = sizeof(struct short_ad);
1907                 break;
1908         case ICBTAG_FLAG_AD_LONG:
1909                 lad = (struct long_ad *)ptr;
1910                 lad->extLength = cpu_to_le32(elen);
1911                 lad->extLocation = cpu_to_lelb(*eloc);
1912                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
1913                 adsize = sizeof(struct long_ad);
1914                 break;
1915         default:
1916                 return;
1917         }
1918
1919         if (epos->bh) {
1920                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1921                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
1922                         struct allocExtDesc *aed =
1923                                 (struct allocExtDesc *)epos->bh->b_data;
1924                         udf_update_tag(epos->bh->b_data,
1925                                        le32_to_cpu(aed->lengthAllocDescs) +
1926                                        sizeof(struct allocExtDesc));
1927                 }
1928                 mark_buffer_dirty_inode(epos->bh, inode);
1929         } else {
1930                 mark_inode_dirty(inode);
1931         }
1932
1933         if (inc)
1934                 epos->offset += adsize;
1935 }
1936
1937 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
1938                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1939 {
1940         int8_t etype;
1941
1942         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
1943                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
1944                 int block;
1945                 epos->block = *eloc;
1946                 epos->offset = sizeof(struct allocExtDesc);
1947                 brelse(epos->bh);
1948                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
1949                 epos->bh = udf_tread(inode->i_sb, block);
1950                 if (!epos->bh) {
1951                         udf_debug("reading block %d failed!\n", block);
1952                         return -1;
1953                 }
1954         }
1955
1956         return etype;
1957 }
1958
1959 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
1960                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
1961 {
1962         int alen;
1963         int8_t etype;
1964         uint8_t *ptr;
1965         struct short_ad *sad;
1966         struct long_ad *lad;
1967         struct udf_inode_info *iinfo = UDF_I(inode);
1968
1969         if (!epos->bh) {
1970                 if (!epos->offset)
1971                         epos->offset = udf_file_entry_alloc_offset(inode);
1972                 ptr = iinfo->i_ext.i_data + epos->offset -
1973                         udf_file_entry_alloc_offset(inode) +
1974                         iinfo->i_lenEAttr;
1975                 alen = udf_file_entry_alloc_offset(inode) +
1976                                                         iinfo->i_lenAlloc;
1977         } else {
1978                 if (!epos->offset)
1979                         epos->offset = sizeof(struct allocExtDesc);
1980                 ptr = epos->bh->b_data + epos->offset;
1981                 alen = sizeof(struct allocExtDesc) +
1982                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
1983                                                         lengthAllocDescs);
1984         }
1985
1986         switch (iinfo->i_alloc_type) {
1987         case ICBTAG_FLAG_AD_SHORT:
1988                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
1989                 if (!sad)
1990                         return -1;
1991                 etype = le32_to_cpu(sad->extLength) >> 30;
1992                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
1993                 eloc->partitionReferenceNum =
1994                                 iinfo->i_location.partitionReferenceNum;
1995                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
1996                 break;
1997         case ICBTAG_FLAG_AD_LONG:
1998                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
1999                 if (!lad)
2000                         return -1;
2001                 etype = le32_to_cpu(lad->extLength) >> 30;
2002                 *eloc = lelb_to_cpu(lad->extLocation);
2003                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2004                 break;
2005         default:
2006                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2007                 return -1;
2008         }
2009
2010         return etype;
2011 }
2012
2013 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2014                               struct kernel_lb_addr neloc, uint32_t nelen)
2015 {
2016         struct kernel_lb_addr oeloc;
2017         uint32_t oelen;
2018         int8_t etype;
2019
2020         if (epos.bh)
2021                 get_bh(epos.bh);
2022
2023         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2024                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2025                 neloc = oeloc;
2026                 nelen = (etype << 30) | oelen;
2027         }
2028         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2029         brelse(epos.bh);
2030
2031         return (nelen >> 30);
2032 }
2033
2034 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2035                        struct kernel_lb_addr eloc, uint32_t elen)
2036 {
2037         struct extent_position oepos;
2038         int adsize;
2039         int8_t etype;
2040         struct allocExtDesc *aed;
2041         struct udf_inode_info *iinfo;
2042
2043         if (epos.bh) {
2044                 get_bh(epos.bh);
2045                 get_bh(epos.bh);
2046         }
2047
2048         iinfo = UDF_I(inode);
2049         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2050                 adsize = sizeof(struct short_ad);
2051         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2052                 adsize = sizeof(struct long_ad);
2053         else
2054                 adsize = 0;
2055
2056         oepos = epos;
2057         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2058                 return -1;
2059
2060         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2061                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2062                 if (oepos.bh != epos.bh) {
2063                         oepos.block = epos.block;
2064                         brelse(oepos.bh);
2065                         get_bh(epos.bh);
2066                         oepos.bh = epos.bh;
2067                         oepos.offset = epos.offset - adsize;
2068                 }
2069         }
2070         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2071         elen = 0;
2072
2073         if (epos.bh != oepos.bh) {
2074                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2075                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2076                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2077                 if (!oepos.bh) {
2078                         iinfo->i_lenAlloc -= (adsize * 2);
2079                         mark_inode_dirty(inode);
2080                 } else {
2081                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2082                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2083                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2084                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2085                                 udf_update_tag(oepos.bh->b_data,
2086                                                 oepos.offset - (2 * adsize));
2087                         else
2088                                 udf_update_tag(oepos.bh->b_data,
2089                                                 sizeof(struct allocExtDesc));
2090                         mark_buffer_dirty_inode(oepos.bh, inode);
2091                 }
2092         } else {
2093                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2094                 if (!oepos.bh) {
2095                         iinfo->i_lenAlloc -= adsize;
2096                         mark_inode_dirty(inode);
2097                 } else {
2098                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2099                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2100                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2101                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2102                                 udf_update_tag(oepos.bh->b_data,
2103                                                 epos.offset - adsize);
2104                         else
2105                                 udf_update_tag(oepos.bh->b_data,
2106                                                 sizeof(struct allocExtDesc));
2107                         mark_buffer_dirty_inode(oepos.bh, inode);
2108                 }
2109         }
2110
2111         brelse(epos.bh);
2112         brelse(oepos.bh);
2113
2114         return (elen >> 30);
2115 }
2116
2117 int8_t inode_bmap(struct inode *inode, sector_t block,
2118                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2119                   uint32_t *elen, sector_t *offset)
2120 {
2121         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2122         loff_t lbcount = 0, bcount =
2123             (loff_t) block << blocksize_bits;
2124         int8_t etype;
2125         struct udf_inode_info *iinfo;
2126
2127         iinfo = UDF_I(inode);
2128         pos->offset = 0;
2129         pos->block = iinfo->i_location;
2130         pos->bh = NULL;
2131         *elen = 0;
2132
2133         do {
2134                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2135                 if (etype == -1) {
2136                         *offset = (bcount - lbcount) >> blocksize_bits;
2137                         iinfo->i_lenExtents = lbcount;
2138                         return -1;
2139                 }
2140                 lbcount += *elen;
2141         } while (lbcount <= bcount);
2142
2143         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2144
2145         return etype;
2146 }
2147
2148 long udf_block_map(struct inode *inode, sector_t block)
2149 {
2150         struct kernel_lb_addr eloc;
2151         uint32_t elen;
2152         sector_t offset;
2153         struct extent_position epos = {};
2154         int ret;
2155
2156         down_read(&UDF_I(inode)->i_data_sem);
2157
2158         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2159                                                 (EXT_RECORDED_ALLOCATED >> 30))
2160                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2161         else
2162                 ret = 0;
2163
2164         up_read(&UDF_I(inode)->i_data_sem);
2165         brelse(epos.bh);
2166
2167         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2168                 return udf_fixed_to_variable(ret);
2169         else
2170                 return ret;
2171 }