fs/udf/inode.c

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