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/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 MODULE_AUTHOR("Ben Fennema");
  47 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  48 MODULE_LICENSE("GPL");
  49
  50 #define EXTENT_MERGE_SIZE 5
  51
  52 static umode_t udf_convert_permissions(struct fileEntry *);
  53 static int udf_update_inode(struct inode *, int);
  54 static int udf_sync_inode(struct inode *inode);
  55 static int udf_alloc_i_data(struct inode *inode, size_t size);
  56 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  57 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  58                               struct kernel_lb_addr, uint32_t);
  59 static void udf_split_extents(struct inode *, int *, int, int,
  60                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  61 static void udf_prealloc_extents(struct inode *, int, int,
  62                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  63 static void udf_merge_extents(struct inode *,
  64                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  65 static void udf_update_extents(struct inode *,
  66                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  67                                struct extent_position *);
  68 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  69
  70 static void __udf_clear_extent_cache(struct inode *inode)
  71 {
  72         struct udf_inode_info *iinfo = UDF_I(inode);
  73
  74         if (iinfo->cached_extent.lstart != -1) {
  75                 brelse(iinfo->cached_extent.epos.bh);
  76                 iinfo->cached_extent.lstart = -1;
  77         }
  78 }
  79
  80 /* Invalidate extent cache */
  81 static void udf_clear_extent_cache(struct inode *inode)
  82 {
  83         struct udf_inode_info *iinfo = UDF_I(inode);
  84
  85         spin_lock(&iinfo->i_extent_cache_lock);
  86         __udf_clear_extent_cache(inode);
  87         spin_unlock(&iinfo->i_extent_cache_lock);
  88 }
  89
  90 /* Return contents of extent cache */
  91 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  92                                  loff_t *lbcount, struct extent_position *pos)
  93 {
  94         struct udf_inode_info *iinfo = UDF_I(inode);
  95         int ret = 0;
  96
  97         spin_lock(&iinfo->i_extent_cache_lock);
  98         if ((iinfo->cached_extent.lstart <= bcount) &&
  99             (iinfo->cached_extent.lstart != -1)) {
 100                 /* Cache hit */
 101                 *lbcount = iinfo->cached_extent.lstart;
 102                 memcpy(pos, &iinfo->cached_extent.epos,
 103                        sizeof(struct extent_position));
 104                 if (pos->bh)
 105                         get_bh(pos->bh);
 106                 ret = 1;
 107         }
 108         spin_unlock(&iinfo->i_extent_cache_lock);
 109         return ret;
 110 }
 111
 112 /* Add extent to extent cache */
 113 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 114                                     struct extent_position *pos, int next_epos)
 115 {
 116         struct udf_inode_info *iinfo = UDF_I(inode);
 117
 118         spin_lock(&iinfo->i_extent_cache_lock);
 119         /* Invalidate previously cached extent */
 120         __udf_clear_extent_cache(inode);
 121         if (pos->bh)
 122                 get_bh(pos->bh);
 123         memcpy(&iinfo->cached_extent.epos, pos,
 124                sizeof(struct extent_position));
 125         iinfo->cached_extent.lstart = estart;
 126         if (next_epos)
 127                 switch (iinfo->i_alloc_type) {
 128                 case ICBTAG_FLAG_AD_SHORT:
 129                         iinfo->cached_extent.epos.offset -=
 130                         sizeof(struct short_ad);
 131                         break;
 132                 case ICBTAG_FLAG_AD_LONG:
 133                         iinfo->cached_extent.epos.offset -=
 134                         sizeof(struct long_ad);
 135                 }
 136         spin_unlock(&iinfo->i_extent_cache_lock);
 137 }
 138
 139 void udf_evict_inode(struct inode *inode)
 140 {
 141         struct udf_inode_info *iinfo = UDF_I(inode);
 142         int want_delete = 0;
 143
 144         if (!inode->i_nlink && !is_bad_inode(inode)) {
 145                 want_delete = 1;
 146                 udf_setsize(inode, 0);
 147                 udf_update_inode(inode, IS_SYNC(inode));
 148         }
 149         truncate_inode_pages_final(&inode->i_data);
 150         invalidate_inode_buffers(inode);
 151         clear_inode(inode);
 152         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 153             inode->i_size != iinfo->i_lenExtents) {
 154                 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",
 155                          inode->i_ino, inode->i_mode,
 156                          (unsigned long long)inode->i_size,
 157                          (unsigned long long)iinfo->i_lenExtents);
 158         }
 159         kfree(iinfo->i_ext.i_data);
 160         iinfo->i_ext.i_data = NULL;
 161         udf_clear_extent_cache(inode);
 162         if (want_delete) {
 163                 udf_free_inode(inode);
 164         }
 165 }
 166
 167 static void udf_write_failed(struct address_space *mapping, loff_t to)
 168 {
 169         struct inode *inode = mapping->host;
 170         struct udf_inode_info *iinfo = UDF_I(inode);
 171         loff_t isize = inode->i_size;
 172
 173         if (to > isize) {
 174                 truncate_pagecache(inode, isize);
 175                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 176                         down_write(&iinfo->i_data_sem);
 177                         udf_clear_extent_cache(inode);
 178                         udf_truncate_extents(inode);
 179                         up_write(&iinfo->i_data_sem);
 180                 }
 181         }
 182 }
 183
 184 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 185 {
 186         return block_write_full_page(page, udf_get_block, wbc);
 187 }
 188
 189 static int udf_writepages(struct address_space *mapping,
 190                         struct writeback_control *wbc)
 191 {
 192         return mpage_writepages(mapping, wbc, udf_get_block);
 193 }
 194
 195 static int udf_readpage(struct file *file, struct page *page)
 196 {
 197         return mpage_readpage(page, udf_get_block);
 198 }
 199
 200 static int udf_readpages(struct file *file, struct address_space *mapping,
 201                         struct list_head *pages, unsigned nr_pages)
 202 {
 203         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 204 }
 205
 206 static int udf_write_begin(struct file *file, struct address_space *mapping,
 207                         loff_t pos, unsigned len, unsigned flags,
 208                         struct page **pagep, void **fsdata)
 209 {
 210         int ret;
 211
 212         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 213         if (unlikely(ret))
 214                 udf_write_failed(mapping, pos + len);
 215         return ret;
 216 }
 217
 218 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 219 {
 220         struct file *file = iocb->ki_filp;
 221         struct address_space *mapping = file->f_mapping;
 222         struct inode *inode = mapping->host;
 223         size_t count = iov_iter_count(iter);
 224         ssize_t ret;
 225
 226         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 227         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 228                 udf_write_failed(mapping, iocb->ki_pos + count);
 229         return ret;
 230 }
 231
 232 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 233 {
 234         return generic_block_bmap(mapping, block, udf_get_block);
 235 }
 236
 237 const struct address_space_operations udf_aops = {
 238         .readpage       = udf_readpage,
 239         .readpages      = udf_readpages,
 240         .writepage      = udf_writepage,
 241         .writepages     = udf_writepages,
 242         .write_begin    = udf_write_begin,
 243         .write_end      = generic_write_end,
 244         .direct_IO      = udf_direct_IO,
 245         .bmap           = udf_bmap,
 246 };
 247
 248 /*
 249  * Expand file stored in ICB to a normal one-block-file
 250  *
 251  * This function requires i_data_sem for writing and releases it.
 252  * This function requires i_mutex held
 253  */
 254 int udf_expand_file_adinicb(struct inode *inode)
 255 {
 256         struct page *page;
 257         char *kaddr;
 258         struct udf_inode_info *iinfo = UDF_I(inode);
 259         int err;
 260         struct writeback_control udf_wbc = {
 261                 .sync_mode = WB_SYNC_NONE,
 262                 .nr_to_write = 1,
 263         };
 264
 265         WARN_ON_ONCE(!inode_is_locked(inode));
 266         if (!iinfo->i_lenAlloc) {
 267                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 268                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 269                 else
 270                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 271                 /* from now on we have normal address_space methods */
 272                 inode->i_data.a_ops = &udf_aops;
 273                 up_write(&iinfo->i_data_sem);
 274                 mark_inode_dirty(inode);
 275                 return 0;
 276         }
 277         /*
 278          * Release i_data_sem so that we can lock a page - page lock ranks
 279          * above i_data_sem. i_mutex still protects us against file changes.
 280          */
 281         up_write(&iinfo->i_data_sem);
 282
 283         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 284         if (!page)
 285                 return -ENOMEM;
 286
 287         if (!PageUptodate(page)) {
 288                 kaddr = kmap(page);
 289                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 290                        PAGE_SIZE - iinfo->i_lenAlloc);
 291                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 292                         iinfo->i_lenAlloc);
 293                 flush_dcache_page(page);
 294                 SetPageUptodate(page);
 295                 kunmap(page);
 296         }
 297         down_write(&iinfo->i_data_sem);
 298         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 299                iinfo->i_lenAlloc);
 300         iinfo->i_lenAlloc = 0;
 301         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 302                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 303         else
 304                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 305         /* from now on we have normal address_space methods */
 306         inode->i_data.a_ops = &udf_aops;
 307         up_write(&iinfo->i_data_sem);
 308         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 309         if (err) {
 310                 /* Restore everything back so that we don't lose data... */
 311                 lock_page(page);
 312                 kaddr = kmap(page);
 313                 down_write(&iinfo->i_data_sem);
 314                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 315                        inode->i_size);
 316                 kunmap(page);
 317                 unlock_page(page);
 318                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 319                 inode->i_data.a_ops = &udf_adinicb_aops;
 320                 up_write(&iinfo->i_data_sem);
 321         }
 322         put_page(page);
 323         mark_inode_dirty(inode);
 324
 325         return err;
 326 }
 327
 328 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 329                                            int *err)
 330 {
 331         int newblock;
 332         struct buffer_head *dbh = NULL;
 333         struct kernel_lb_addr eloc;
 334         uint8_t alloctype;
 335         struct extent_position epos;
 336
 337         struct udf_fileident_bh sfibh, dfibh;
 338         loff_t f_pos = udf_ext0_offset(inode);
 339         int size = udf_ext0_offset(inode) + inode->i_size;
 340         struct fileIdentDesc cfi, *sfi, *dfi;
 341         struct udf_inode_info *iinfo = UDF_I(inode);
 342
 343         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 344                 alloctype = ICBTAG_FLAG_AD_SHORT;
 345         else
 346                 alloctype = ICBTAG_FLAG_AD_LONG;
 347
 348         if (!inode->i_size) {
 349                 iinfo->i_alloc_type = alloctype;
 350                 mark_inode_dirty(inode);
 351                 return NULL;
 352         }
 353
 354         /* alloc block, and copy data to it */
 355         *block = udf_new_block(inode->i_sb, inode,
 356                                iinfo->i_location.partitionReferenceNum,
 357                                iinfo->i_location.logicalBlockNum, err);
 358         if (!(*block))
 359                 return NULL;
 360         newblock = udf_get_pblock(inode->i_sb, *block,
 361                                   iinfo->i_location.partitionReferenceNum,
 362                                 0);
 363         if (!newblock)
 364                 return NULL;
 365         dbh = udf_tgetblk(inode->i_sb, newblock);
 366         if (!dbh)
 367                 return NULL;
 368         lock_buffer(dbh);
 369         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 370         set_buffer_uptodate(dbh);
 371         unlock_buffer(dbh);
 372         mark_buffer_dirty_inode(dbh, inode);
 373
 374         sfibh.soffset = sfibh.eoffset =
 375                         f_pos & (inode->i_sb->s_blocksize - 1);
 376         sfibh.sbh = sfibh.ebh = NULL;
 377         dfibh.soffset = dfibh.eoffset = 0;
 378         dfibh.sbh = dfibh.ebh = dbh;
 379         while (f_pos < size) {
 380                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 381                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 382                                          NULL, NULL, NULL);
 383                 if (!sfi) {
 384                         brelse(dbh);
 385                         return NULL;
 386                 }
 387                 iinfo->i_alloc_type = alloctype;
 388                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 389                 dfibh.soffset = dfibh.eoffset;
 390                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 391                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 392                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 393                                  sfi->fileIdent +
 394                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 395                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 396                         brelse(dbh);
 397                         return NULL;
 398                 }
 399         }
 400         mark_buffer_dirty_inode(dbh, inode);
 401
 402         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 403                 iinfo->i_lenAlloc);
 404         iinfo->i_lenAlloc = 0;
 405         eloc.logicalBlockNum = *block;
 406         eloc.partitionReferenceNum =
 407                                 iinfo->i_location.partitionReferenceNum;
 408         iinfo->i_lenExtents = inode->i_size;
 409         epos.bh = NULL;
 410         epos.block = iinfo->i_location;
 411         epos.offset = udf_file_entry_alloc_offset(inode);
 412         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 413         /* UniqueID stuff */
 414
 415         brelse(epos.bh);
 416         mark_inode_dirty(inode);
 417         return dbh;
 418 }
 419
 420 static int udf_get_block(struct inode *inode, sector_t block,
 421                          struct buffer_head *bh_result, int create)
 422 {
 423         int err, new;
 424         sector_t phys = 0;
 425         struct udf_inode_info *iinfo;
 426
 427         if (!create) {
 428                 phys = udf_block_map(inode, block);
 429                 if (phys)
 430                         map_bh(bh_result, inode->i_sb, phys);
 431                 return 0;
 432         }
 433
 434         err = -EIO;
 435         new = 0;
 436         iinfo = UDF_I(inode);
 437
 438         down_write(&iinfo->i_data_sem);
 439         if (block == iinfo->i_next_alloc_block + 1) {
 440                 iinfo->i_next_alloc_block++;
 441                 iinfo->i_next_alloc_goal++;
 442         }
 443
 444         udf_clear_extent_cache(inode);
 445         phys = inode_getblk(inode, block, &err, &new);
 446         if (!phys)
 447                 goto abort;
 448
 449         if (new)
 450                 set_buffer_new(bh_result);
 451         map_bh(bh_result, inode->i_sb, phys);
 452
 453 abort:
 454         up_write(&iinfo->i_data_sem);
 455         return err;
 456 }
 457
 458 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 459                                       int create, int *err)
 460 {
 461         struct buffer_head *bh;
 462         struct buffer_head dummy;
 463
 464         dummy.b_state = 0;
 465         dummy.b_blocknr = -1000;
 466         *err = udf_get_block(inode, block, &dummy, create);
 467         if (!*err && buffer_mapped(&dummy)) {
 468                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 469                 if (buffer_new(&dummy)) {
 470                         lock_buffer(bh);
 471                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 472                         set_buffer_uptodate(bh);
 473                         unlock_buffer(bh);
 474                         mark_buffer_dirty_inode(bh, inode);
 475                 }
 476                 return bh;
 477         }
 478
 479         return NULL;
 480 }
 481
 482 /* Extend the file by 'blocks' blocks, return the number of extents added */
 483 static int udf_do_extend_file(struct inode *inode,
 484                               struct extent_position *last_pos,
 485                               struct kernel_long_ad *last_ext,
 486                               sector_t blocks)
 487 {
 488         sector_t add;
 489         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 490         struct super_block *sb = inode->i_sb;
 491         struct kernel_lb_addr prealloc_loc = {};
 492         int prealloc_len = 0;
 493         struct udf_inode_info *iinfo;
 494         int err;
 495
 496         /* The previous extent is fake and we should not extend by anything
 497          * - there's nothing to do... */
 498         if (!blocks && fake)
 499                 return 0;
 500
 501         iinfo = UDF_I(inode);
 502         /* Round the last extent up to a multiple of block size */
 503         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 504                 last_ext->extLength =
 505                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 506                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 507                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 508                 iinfo->i_lenExtents =
 509                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 510                         ~(sb->s_blocksize - 1);
 511         }
 512
 513         /* Last extent are just preallocated blocks? */
 514         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 515                                                 EXT_NOT_RECORDED_ALLOCATED) {
 516                 /* Save the extent so that we can reattach it to the end */
 517                 prealloc_loc = last_ext->extLocation;
 518                 prealloc_len = last_ext->extLength;
 519                 /* Mark the extent as a hole */
 520                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 521                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 522                 last_ext->extLocation.logicalBlockNum = 0;
 523                 last_ext->extLocation.partitionReferenceNum = 0;
 524         }
 525
 526         /* Can we merge with the previous extent? */
 527         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 528                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 529                 add = ((1 << 30) - sb->s_blocksize -
 530                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK)) >>
 531                         sb->s_blocksize_bits;
 532                 if (add > blocks)
 533                         add = blocks;
 534                 blocks -= add;
 535                 last_ext->extLength += add << sb->s_blocksize_bits;
 536         }
 537
 538         if (fake) {
 539                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 540                              last_ext->extLength, 1);
 541                 count++;
 542         } else {
 543                 struct kernel_lb_addr tmploc;
 544                 uint32_t tmplen;
 545
 546                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 547                                 last_ext->extLength, 1);
 548                 /*
 549                  * We've rewritten the last extent but there may be empty
 550                  * indirect extent after it - enter it.
 551                  */
 552                 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 553         }
 554
 555         /* Managed to do everything necessary? */
 556         if (!blocks)
 557                 goto out;
 558
 559         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 560         last_ext->extLocation.logicalBlockNum = 0;
 561         last_ext->extLocation.partitionReferenceNum = 0;
 562         add = (1 << (30-sb->s_blocksize_bits)) - 1;
 563         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 564                                 (add << sb->s_blocksize_bits);
 565
 566         /* Create enough extents to cover the whole hole */
 567         while (blocks > add) {
 568                 blocks -= add;
 569                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 570                                    last_ext->extLength, 1);
 571                 if (err)
 572                         return err;
 573                 count++;
 574         }
 575         if (blocks) {
 576                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 577                         (blocks << sb->s_blocksize_bits);
 578                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 579                                    last_ext->extLength, 1);
 580                 if (err)
 581                         return err;
 582                 count++;
 583         }
 584
 585 out:
 586         /* Do we have some preallocated blocks saved? */
 587         if (prealloc_len) {
 588                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 589                                    prealloc_len, 1);
 590                 if (err)
 591                         return err;
 592                 last_ext->extLocation = prealloc_loc;
 593                 last_ext->extLength = prealloc_len;
 594                 count++;
 595         }
 596
 597         /* last_pos should point to the last written extent... */
 598         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 599                 last_pos->offset -= sizeof(struct short_ad);
 600         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 601                 last_pos->offset -= sizeof(struct long_ad);
 602         else
 603                 return -EIO;
 604
 605         return count;
 606 }
 607
 608 static int udf_extend_file(struct inode *inode, loff_t newsize)
 609 {
 610
 611         struct extent_position epos;
 612         struct kernel_lb_addr eloc;
 613         uint32_t elen;
 614         int8_t etype;
 615         struct super_block *sb = inode->i_sb;
 616         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 617         int adsize;
 618         struct udf_inode_info *iinfo = UDF_I(inode);
 619         struct kernel_long_ad extent;
 620         int err;
 621
 622         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 623                 adsize = sizeof(struct short_ad);
 624         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 625                 adsize = sizeof(struct long_ad);
 626         else
 627                 BUG();
 628
 629         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 630
 631         /* File has extent covering the new size (could happen when extending
 632          * inside a block)? */
 633         if (etype != -1)
 634                 return 0;
 635         if (newsize & (sb->s_blocksize - 1))
 636                 offset++;
 637         /* Extended file just to the boundary of the last file block? */
 638         if (offset == 0)
 639                 return 0;
 640
 641         /* Truncate is extending the file by 'offset' blocks */
 642         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 643             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 644                 /* File has no extents at all or has empty last
 645                  * indirect extent! Create a fake extent... */
 646                 extent.extLocation.logicalBlockNum = 0;
 647                 extent.extLocation.partitionReferenceNum = 0;
 648                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 649         } else {
 650                 epos.offset -= adsize;
 651                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 652                                       &extent.extLength, 0);
 653                 extent.extLength |= etype << 30;
 654         }
 655         err = udf_do_extend_file(inode, &epos, &extent, offset);
 656         if (err < 0)
 657                 goto out;
 658         err = 0;
 659         iinfo->i_lenExtents = newsize;
 660 out:
 661         brelse(epos.bh);
 662         return err;
 663 }
 664
 665 static sector_t inode_getblk(struct inode *inode, sector_t block,
 666                              int *err, int *new)
 667 {
 668         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 669         struct extent_position prev_epos, cur_epos, next_epos;
 670         int count = 0, startnum = 0, endnum = 0;
 671         uint32_t elen = 0, tmpelen;
 672         struct kernel_lb_addr eloc, tmpeloc;
 673         int c = 1;
 674         loff_t lbcount = 0, b_off = 0;
 675         uint32_t newblocknum, newblock;
 676         sector_t offset = 0;
 677         int8_t etype;
 678         struct udf_inode_info *iinfo = UDF_I(inode);
 679         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 680         int lastblock = 0;
 681         bool isBeyondEOF;
 682
 683         *err = 0;
 684         *new = 0;
 685         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 686         prev_epos.block = iinfo->i_location;
 687         prev_epos.bh = NULL;
 688         cur_epos = next_epos = prev_epos;
 689         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 690
 691         /* find the extent which contains the block we are looking for.
 692            alternate between laarr[0] and laarr[1] for locations of the
 693            current extent, and the previous extent */
 694         do {
 695                 if (prev_epos.bh != cur_epos.bh) {
 696                         brelse(prev_epos.bh);
 697                         get_bh(cur_epos.bh);
 698                         prev_epos.bh = cur_epos.bh;
 699                 }
 700                 if (cur_epos.bh != next_epos.bh) {
 701                         brelse(cur_epos.bh);
 702                         get_bh(next_epos.bh);
 703                         cur_epos.bh = next_epos.bh;
 704                 }
 705
 706                 lbcount += elen;
 707
 708                 prev_epos.block = cur_epos.block;
 709                 cur_epos.block = next_epos.block;
 710
 711                 prev_epos.offset = cur_epos.offset;
 712                 cur_epos.offset = next_epos.offset;
 713
 714                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 715                 if (etype == -1)
 716                         break;
 717
 718                 c = !c;
 719
 720                 laarr[c].extLength = (etype << 30) | elen;
 721                 laarr[c].extLocation = eloc;
 722
 723                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 724                         pgoal = eloc.logicalBlockNum +
 725                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 726                                  inode->i_sb->s_blocksize_bits);
 727
 728                 count++;
 729         } while (lbcount + elen <= b_off);
 730
 731         b_off -= lbcount;
 732         offset = b_off >> inode->i_sb->s_blocksize_bits;
 733         /*
 734          * Move prev_epos and cur_epos into indirect extent if we are at
 735          * the pointer to it
 736          */
 737         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 738         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 739
 740         /* if the extent is allocated and recorded, return the block
 741            if the extent is not a multiple of the blocksize, round up */
 742
 743         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 744                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 745                         elen = EXT_RECORDED_ALLOCATED |
 746                                 ((elen + inode->i_sb->s_blocksize - 1) &
 747                                  ~(inode->i_sb->s_blocksize - 1));
 748                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 749                 }
 750                 brelse(prev_epos.bh);
 751                 brelse(cur_epos.bh);
 752                 brelse(next_epos.bh);
 753                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 754                 return newblock;
 755         }
 756
 757         /* Are we beyond EOF? */
 758         if (etype == -1) {
 759                 int ret;
 760                 isBeyondEOF = true;
 761                 if (count) {
 762                         if (c)
 763                                 laarr[0] = laarr[1];
 764                         startnum = 1;
 765                 } else {
 766                         /* Create a fake extent when there's not one */
 767                         memset(&laarr[0].extLocation, 0x00,
 768                                 sizeof(struct kernel_lb_addr));
 769                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 770                         /* Will udf_do_extend_file() create real extent from
 771                            a fake one? */
 772                         startnum = (offset > 0);
 773                 }
 774                 /* Create extents for the hole between EOF and offset */
 775                 ret = udf_do_extend_file(inode, &prev_epos, laarr, offset);
 776                 if (ret < 0) {
 777                         brelse(prev_epos.bh);
 778                         brelse(cur_epos.bh);
 779                         brelse(next_epos.bh);
 780                         *err = ret;
 781                         return 0;
 782                 }
 783                 c = 0;
 784                 offset = 0;
 785                 count += ret;
 786                 /* We are not covered by a preallocated extent? */
 787                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 788                                                 EXT_NOT_RECORDED_ALLOCATED) {
 789                         /* Is there any real extent? - otherwise we overwrite
 790                          * the fake one... */
 791                         if (count)
 792                                 c = !c;
 793                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 794                                 inode->i_sb->s_blocksize;
 795                         memset(&laarr[c].extLocation, 0x00,
 796                                 sizeof(struct kernel_lb_addr));
 797                         count++;
 798                 }
 799                 endnum = c + 1;
 800                 lastblock = 1;
 801         } else {
 802                 isBeyondEOF = false;
 803                 endnum = startnum = ((count > 2) ? 2 : count);
 804
 805                 /* if the current extent is in position 0,
 806                    swap it with the previous */
 807                 if (!c && count != 1) {
 808                         laarr[2] = laarr[0];
 809                         laarr[0] = laarr[1];
 810                         laarr[1] = laarr[2];
 811                         c = 1;
 812                 }
 813
 814                 /* if the current block is located in an extent,
 815                    read the next extent */
 816                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 817                 if (etype != -1) {
 818                         laarr[c + 1].extLength = (etype << 30) | elen;
 819                         laarr[c + 1].extLocation = eloc;
 820                         count++;
 821                         startnum++;
 822                         endnum++;
 823                 } else
 824                         lastblock = 1;
 825         }
 826
 827         /* if the current extent is not recorded but allocated, get the
 828          * block in the extent corresponding to the requested block */
 829         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 830                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 831         else { /* otherwise, allocate a new block */
 832                 if (iinfo->i_next_alloc_block == block)
 833                         goal = iinfo->i_next_alloc_goal;
 834
 835                 if (!goal) {
 836                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 837                                 goal = iinfo->i_location.logicalBlockNum + 1;
 838                 }
 839
 840                 newblocknum = udf_new_block(inode->i_sb, inode,
 841                                 iinfo->i_location.partitionReferenceNum,
 842                                 goal, err);
 843                 if (!newblocknum) {
 844                         brelse(prev_epos.bh);
 845                         brelse(cur_epos.bh);
 846                         brelse(next_epos.bh);
 847                         *err = -ENOSPC;
 848                         return 0;
 849                 }
 850                 if (isBeyondEOF)
 851                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 852         }
 853
 854         /* if the extent the requsted block is located in contains multiple
 855          * blocks, split the extent into at most three extents. blocks prior
 856          * to requested block, requested block, and blocks after requested
 857          * block */
 858         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 859
 860 #ifdef UDF_PREALLOCATE
 861         /* We preallocate blocks only for regular files. It also makes sense
 862          * for directories but there's a problem when to drop the
 863          * preallocation. We might use some delayed work for that but I feel
 864          * it's overengineering for a filesystem like UDF. */
 865         if (S_ISREG(inode->i_mode))
 866                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 867 #endif
 868
 869         /* merge any continuous blocks in laarr */
 870         udf_merge_extents(inode, laarr, &endnum);
 871
 872         /* write back the new extents, inserting new extents if the new number
 873          * of extents is greater than the old number, and deleting extents if
 874          * the new number of extents is less than the old number */
 875         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 876
 877         brelse(prev_epos.bh);
 878         brelse(cur_epos.bh);
 879         brelse(next_epos.bh);
 880
 881         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 882                                 iinfo->i_location.partitionReferenceNum, 0);
 883         if (!newblock) {
 884                 *err = -EIO;
 885                 return 0;
 886         }
 887         *new = 1;
 888         iinfo->i_next_alloc_block = block;
 889         iinfo->i_next_alloc_goal = newblocknum;
 890         inode->i_ctime = current_time(inode);
 891
 892         if (IS_SYNC(inode))
 893                 udf_sync_inode(inode);
 894         else
 895                 mark_inode_dirty(inode);
 896
 897         return newblock;
 898 }
 899
 900 static void udf_split_extents(struct inode *inode, int *c, int offset,
 901                               int newblocknum,
 902                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 903                               int *endnum)
 904 {
 905         unsigned long blocksize = inode->i_sb->s_blocksize;
 906         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 907
 908         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 909             (laarr[*c].extLength >> 30) ==
 910                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 911                 int curr = *c;
 912                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 913                             blocksize - 1) >> blocksize_bits;
 914                 int8_t etype = (laarr[curr].extLength >> 30);
 915
 916                 if (blen == 1)
 917                         ;
 918                 else if (!offset || blen == offset + 1) {
 919                         laarr[curr + 2] = laarr[curr + 1];
 920                         laarr[curr + 1] = laarr[curr];
 921                 } else {
 922                         laarr[curr + 3] = laarr[curr + 1];
 923                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 924                 }
 925
 926                 if (offset) {
 927                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 928                                 udf_free_blocks(inode->i_sb, inode,
 929                                                 &laarr[curr].extLocation,
 930                                                 0, offset);
 931                                 laarr[curr].extLength =
 932                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 933                                         (offset << blocksize_bits);
 934                                 laarr[curr].extLocation.logicalBlockNum = 0;
 935                                 laarr[curr].extLocation.
 936                                                 partitionReferenceNum = 0;
 937                         } else
 938                                 laarr[curr].extLength = (etype << 30) |
 939                                         (offset << blocksize_bits);
 940                         curr++;
 941                         (*c)++;
 942                         (*endnum)++;
 943                 }
 944
 945                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 946                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 947                         laarr[curr].extLocation.partitionReferenceNum =
 948                                 UDF_I(inode)->i_location.partitionReferenceNum;
 949                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 950                         blocksize;
 951                 curr++;
 952
 953                 if (blen != offset + 1) {
 954                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 955                                 laarr[curr].extLocation.logicalBlockNum +=
 956                                                                 offset + 1;
 957                         laarr[curr].extLength = (etype << 30) |
 958                                 ((blen - (offset + 1)) << blocksize_bits);
 959                         curr++;
 960                         (*endnum)++;
 961                 }
 962         }
 963 }
 964
 965 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 966                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 967                                  int *endnum)
 968 {
 969         int start, length = 0, currlength = 0, i;
 970
 971         if (*endnum >= (c + 1)) {
 972                 if (!lastblock)
 973                         return;
 974                 else
 975                         start = c;
 976         } else {
 977                 if ((laarr[c + 1].extLength >> 30) ==
 978                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 979                         start = c + 1;
 980                         length = currlength =
 981                                 (((laarr[c + 1].extLength &
 982                                         UDF_EXTENT_LENGTH_MASK) +
 983                                 inode->i_sb->s_blocksize - 1) >>
 984                                 inode->i_sb->s_blocksize_bits);
 985                 } else
 986                         start = c;
 987         }
 988
 989         for (i = start + 1; i <= *endnum; i++) {
 990                 if (i == *endnum) {
 991                         if (lastblock)
 992                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 993                 } else if ((laarr[i].extLength >> 30) ==
 994                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 995                         length += (((laarr[i].extLength &
 996                                                 UDF_EXTENT_LENGTH_MASK) +
 997                                     inode->i_sb->s_blocksize - 1) >>
 998                                     inode->i_sb->s_blocksize_bits);
 999                 } else
1000                         break;
1001         }
1002
1003         if (length) {
1004                 int next = laarr[start].extLocation.logicalBlockNum +
1005                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1006                           inode->i_sb->s_blocksize - 1) >>
1007                           inode->i_sb->s_blocksize_bits);
1008                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1009                                 laarr[start].extLocation.partitionReferenceNum,
1010                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1011                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1012                                 currlength);
1013                 if (numalloc)   {
1014                         if (start == (c + 1))
1015                                 laarr[start].extLength +=
1016                                         (numalloc <<
1017                                          inode->i_sb->s_blocksize_bits);
1018                         else {
1019                                 memmove(&laarr[c + 2], &laarr[c + 1],
1020                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1021                                 (*endnum)++;
1022                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1023                                 laarr[c + 1].extLocation.partitionReferenceNum =
1024                                         laarr[c].extLocation.
1025                                                         partitionReferenceNum;
1026                                 laarr[c + 1].extLength =
1027                                         EXT_NOT_RECORDED_ALLOCATED |
1028                                         (numalloc <<
1029                                          inode->i_sb->s_blocksize_bits);
1030                                 start = c + 1;
1031                         }
1032
1033                         for (i = start + 1; numalloc && i < *endnum; i++) {
1034                                 int elen = ((laarr[i].extLength &
1035                                                 UDF_EXTENT_LENGTH_MASK) +
1036                                             inode->i_sb->s_blocksize - 1) >>
1037                                             inode->i_sb->s_blocksize_bits;
1038
1039                                 if (elen > numalloc) {
1040                                         laarr[i].extLength -=
1041                                                 (numalloc <<
1042                                                  inode->i_sb->s_blocksize_bits);
1043                                         numalloc = 0;
1044                                 } else {
1045                                         numalloc -= elen;
1046                                         if (*endnum > (i + 1))
1047                                                 memmove(&laarr[i],
1048                                                         &laarr[i + 1],
1049                                                         sizeof(struct long_ad) *
1050                                                         (*endnum - (i + 1)));
1051                                         i--;
1052                                         (*endnum)--;
1053                                 }
1054                         }
1055                         UDF_I(inode)->i_lenExtents +=
1056                                 numalloc << inode->i_sb->s_blocksize_bits;
1057                 }
1058         }
1059 }
1060
1061 static void udf_merge_extents(struct inode *inode,
1062                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1063                               int *endnum)
1064 {
1065         int i;
1066         unsigned long blocksize = inode->i_sb->s_blocksize;
1067         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1068
1069         for (i = 0; i < (*endnum - 1); i++) {
1070                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1071                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1072
1073                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1074                         (((li->extLength >> 30) ==
1075                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1076                         ((lip1->extLocation.logicalBlockNum -
1077                           li->extLocation.logicalBlockNum) ==
1078                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1079                         blocksize - 1) >> blocksize_bits)))) {
1080
1081                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1082                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1083                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1084                                 lip1->extLength = (lip1->extLength -
1085                                                   (li->extLength &
1086                                                    UDF_EXTENT_LENGTH_MASK) +
1087                                                    UDF_EXTENT_LENGTH_MASK) &
1088                                                         ~(blocksize - 1);
1089                                 li->extLength = (li->extLength &
1090                                                  UDF_EXTENT_FLAG_MASK) +
1091                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1092                                                 blocksize;
1093                                 lip1->extLocation.logicalBlockNum =
1094                                         li->extLocation.logicalBlockNum +
1095                                         ((li->extLength &
1096                                                 UDF_EXTENT_LENGTH_MASK) >>
1097                                                 blocksize_bits);
1098                         } else {
1099                                 li->extLength = lip1->extLength +
1100                                         (((li->extLength &
1101                                                 UDF_EXTENT_LENGTH_MASK) +
1102                                          blocksize - 1) & ~(blocksize - 1));
1103                                 if (*endnum > (i + 2))
1104                                         memmove(&laarr[i + 1], &laarr[i + 2],
1105                                                 sizeof(struct long_ad) *
1106                                                 (*endnum - (i + 2)));
1107                                 i--;
1108                                 (*endnum)--;
1109                         }
1110                 } else if (((li->extLength >> 30) ==
1111                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1112                            ((lip1->extLength >> 30) ==
1113                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1114                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1115                                         ((li->extLength &
1116                                           UDF_EXTENT_LENGTH_MASK) +
1117                                          blocksize - 1) >> blocksize_bits);
1118                         li->extLocation.logicalBlockNum = 0;
1119                         li->extLocation.partitionReferenceNum = 0;
1120
1121                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1122                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1123                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1124                                 lip1->extLength = (lip1->extLength -
1125                                                    (li->extLength &
1126                                                    UDF_EXTENT_LENGTH_MASK) +
1127                                                    UDF_EXTENT_LENGTH_MASK) &
1128                                                    ~(blocksize - 1);
1129                                 li->extLength = (li->extLength &
1130                                                  UDF_EXTENT_FLAG_MASK) +
1131                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1132                                                 blocksize;
1133                         } else {
1134                                 li->extLength = lip1->extLength +
1135                                         (((li->extLength &
1136                                                 UDF_EXTENT_LENGTH_MASK) +
1137                                           blocksize - 1) & ~(blocksize - 1));
1138                                 if (*endnum > (i + 2))
1139                                         memmove(&laarr[i + 1], &laarr[i + 2],
1140                                                 sizeof(struct long_ad) *
1141                                                 (*endnum - (i + 2)));
1142                                 i--;
1143                                 (*endnum)--;
1144                         }
1145                 } else if ((li->extLength >> 30) ==
1146                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1147                         udf_free_blocks(inode->i_sb, inode,
1148                                         &li->extLocation, 0,
1149                                         ((li->extLength &
1150                                                 UDF_EXTENT_LENGTH_MASK) +
1151                                          blocksize - 1) >> blocksize_bits);
1152                         li->extLocation.logicalBlockNum = 0;
1153                         li->extLocation.partitionReferenceNum = 0;
1154                         li->extLength = (li->extLength &
1155                                                 UDF_EXTENT_LENGTH_MASK) |
1156                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1157                 }
1158         }
1159 }
1160
1161 static void udf_update_extents(struct inode *inode,
1162                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1163                                int startnum, int endnum,
1164                                struct extent_position *epos)
1165 {
1166         int start = 0, i;
1167         struct kernel_lb_addr tmploc;
1168         uint32_t tmplen;
1169
1170         if (startnum > endnum) {
1171                 for (i = 0; i < (startnum - endnum); i++)
1172                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1173                                         laarr[i].extLength);
1174         } else if (startnum < endnum) {
1175                 for (i = 0; i < (endnum - startnum); i++) {
1176                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1177                                         laarr[i].extLength);
1178                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1179                                       &laarr[i].extLength, 1);
1180                         start++;
1181                 }
1182         }
1183
1184         for (i = start; i < endnum; i++) {
1185                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1186                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1187                                laarr[i].extLength, 1);
1188         }
1189 }
1190
1191 struct buffer_head *udf_bread(struct inode *inode, int block,
1192                               int create, int *err)
1193 {
1194         struct buffer_head *bh = NULL;
1195
1196         bh = udf_getblk(inode, block, create, err);
1197         if (!bh)
1198                 return NULL;
1199
1200         if (buffer_uptodate(bh))
1201                 return bh;
1202
1203         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1204
1205         wait_on_buffer(bh);
1206         if (buffer_uptodate(bh))
1207                 return bh;
1208
1209         brelse(bh);
1210         *err = -EIO;
1211         return NULL;
1212 }
1213
1214 int udf_setsize(struct inode *inode, loff_t newsize)
1215 {
1216         int err;
1217         struct udf_inode_info *iinfo;
1218         int bsize = 1 << inode->i_blkbits;
1219
1220         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1221               S_ISLNK(inode->i_mode)))
1222                 return -EINVAL;
1223         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1224                 return -EPERM;
1225
1226         iinfo = UDF_I(inode);
1227         if (newsize > inode->i_size) {
1228                 down_write(&iinfo->i_data_sem);
1229                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1230                         if (bsize <
1231                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1232                                 err = udf_expand_file_adinicb(inode);
1233                                 if (err)
1234                                         return err;
1235                                 down_write(&iinfo->i_data_sem);
1236                         } else {
1237                                 iinfo->i_lenAlloc = newsize;
1238                                 goto set_size;
1239                         }
1240                 }
1241                 err = udf_extend_file(inode, newsize);
1242                 if (err) {
1243                         up_write(&iinfo->i_data_sem);
1244                         return err;
1245                 }
1246 set_size:
1247                 truncate_setsize(inode, newsize);
1248                 up_write(&iinfo->i_data_sem);
1249         } else {
1250                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1251                         down_write(&iinfo->i_data_sem);
1252                         udf_clear_extent_cache(inode);
1253                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1254                                0x00, bsize - newsize -
1255                                udf_file_entry_alloc_offset(inode));
1256                         iinfo->i_lenAlloc = newsize;
1257                         truncate_setsize(inode, newsize);
1258                         up_write(&iinfo->i_data_sem);
1259                         goto update_time;
1260                 }
1261                 err = block_truncate_page(inode->i_mapping, newsize,
1262                                           udf_get_block);
1263                 if (err)
1264                         return err;
1265                 down_write(&iinfo->i_data_sem);
1266                 udf_clear_extent_cache(inode);
1267                 truncate_setsize(inode, newsize);
1268                 udf_truncate_extents(inode);
1269                 up_write(&iinfo->i_data_sem);
1270         }
1271 update_time:
1272         inode->i_mtime = inode->i_ctime = current_time(inode);
1273         if (IS_SYNC(inode))
1274                 udf_sync_inode(inode);
1275         else
1276                 mark_inode_dirty(inode);
1277         return 0;
1278 }
1279
1280 /*
1281  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1282  * arbitrary - just that we hopefully don't limit any real use of rewritten
1283  * inode on write-once media but avoid looping for too long on corrupted media.
1284  */
1285 #define UDF_MAX_ICB_NESTING 1024
1286
1287 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1288 {
1289         struct buffer_head *bh = NULL;
1290         struct fileEntry *fe;
1291         struct extendedFileEntry *efe;
1292         uint16_t ident;
1293         struct udf_inode_info *iinfo = UDF_I(inode);
1294         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1295         struct kernel_lb_addr *iloc = &iinfo->i_location;
1296         unsigned int link_count;
1297         unsigned int indirections = 0;
1298         int bs = inode->i_sb->s_blocksize;
1299         int ret = -EIO;
1300
1301 reread:
1302         if (iloc->logicalBlockNum >=
1303             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1304                 udf_debug("block=%d, partition=%d out of range\n",
1305                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1306                 return -EIO;
1307         }
1308
1309         /*
1310          * Set defaults, but the inode is still incomplete!
1311          * Note: get_new_inode() sets the following on a new inode:
1312          *      i_sb = sb
1313          *      i_no = ino
1314          *      i_flags = sb->s_flags
1315          *      i_state = 0
1316          * clean_inode(): zero fills and sets
1317          *      i_count = 1
1318          *      i_nlink = 1
1319          *      i_op = NULL;
1320          */
1321         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1322         if (!bh) {
1323                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1324                 return -EIO;
1325         }
1326
1327         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1328             ident != TAG_IDENT_USE) {
1329                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1330                         inode->i_ino, ident);
1331                 goto out;
1332         }
1333
1334         fe = (struct fileEntry *)bh->b_data;
1335         efe = (struct extendedFileEntry *)bh->b_data;
1336
1337         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1338                 struct buffer_head *ibh;
1339
1340                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1341                 if (ident == TAG_IDENT_IE && ibh) {
1342                         struct kernel_lb_addr loc;
1343                         struct indirectEntry *ie;
1344
1345                         ie = (struct indirectEntry *)ibh->b_data;
1346                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1347
1348                         if (ie->indirectICB.extLength) {
1349                                 brelse(ibh);
1350                                 memcpy(&iinfo->i_location, &loc,
1351                                        sizeof(struct kernel_lb_addr));
1352                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1353                                         udf_err(inode->i_sb,
1354                                                 "too many ICBs in ICB hierarchy"
1355                                                 " (max %d supported)\n",
1356                                                 UDF_MAX_ICB_NESTING);
1357                                         goto out;
1358                                 }
1359                                 brelse(bh);
1360                                 goto reread;
1361                         }
1362                 }
1363                 brelse(ibh);
1364         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1365                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1366                         le16_to_cpu(fe->icbTag.strategyType));
1367                 goto out;
1368         }
1369         if (fe->icbTag.strategyType == cpu_to_le16(4))
1370                 iinfo->i_strat4096 = 0;
1371         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1372                 iinfo->i_strat4096 = 1;
1373
1374         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1375                                                         ICBTAG_FLAG_AD_MASK;
1376         iinfo->i_unique = 0;
1377         iinfo->i_lenEAttr = 0;
1378         iinfo->i_lenExtents = 0;
1379         iinfo->i_lenAlloc = 0;
1380         iinfo->i_next_alloc_block = 0;
1381         iinfo->i_next_alloc_goal = 0;
1382         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1383                 iinfo->i_efe = 1;
1384                 iinfo->i_use = 0;
1385                 ret = udf_alloc_i_data(inode, bs -
1386                                         sizeof(struct extendedFileEntry));
1387                 if (ret)
1388                         goto out;
1389                 memcpy(iinfo->i_ext.i_data,
1390                        bh->b_data + sizeof(struct extendedFileEntry),
1391                        bs - sizeof(struct extendedFileEntry));
1392         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1393                 iinfo->i_efe = 0;
1394                 iinfo->i_use = 0;
1395                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1396                 if (ret)
1397                         goto out;
1398                 memcpy(iinfo->i_ext.i_data,
1399                        bh->b_data + sizeof(struct fileEntry),
1400                        bs - sizeof(struct fileEntry));
1401         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1402                 iinfo->i_efe = 0;
1403                 iinfo->i_use = 1;
1404                 iinfo->i_lenAlloc = le32_to_cpu(
1405                                 ((struct unallocSpaceEntry *)bh->b_data)->
1406                                  lengthAllocDescs);
1407                 ret = udf_alloc_i_data(inode, bs -
1408                                         sizeof(struct unallocSpaceEntry));
1409                 if (ret)
1410                         goto out;
1411                 memcpy(iinfo->i_ext.i_data,
1412                        bh->b_data + sizeof(struct unallocSpaceEntry),
1413                        bs - sizeof(struct unallocSpaceEntry));
1414                 return 0;
1415         }
1416
1417         ret = -EIO;
1418         read_lock(&sbi->s_cred_lock);
1419         i_uid_write(inode, le32_to_cpu(fe->uid));
1420         if (!uid_valid(inode->i_uid) ||
1421             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1422             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1423                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1424
1425         i_gid_write(inode, le32_to_cpu(fe->gid));
1426         if (!gid_valid(inode->i_gid) ||
1427             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1428             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1429                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1430
1431         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1432                         sbi->s_fmode != UDF_INVALID_MODE)
1433                 inode->i_mode = sbi->s_fmode;
1434         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1435                         sbi->s_dmode != UDF_INVALID_MODE)
1436                 inode->i_mode = sbi->s_dmode;
1437         else
1438                 inode->i_mode = udf_convert_permissions(fe);
1439         inode->i_mode &= ~sbi->s_umask;
1440         read_unlock(&sbi->s_cred_lock);
1441
1442         link_count = le16_to_cpu(fe->fileLinkCount);
1443         if (!link_count) {
1444                 if (!hidden_inode) {
1445                         ret = -ESTALE;
1446                         goto out;
1447                 }
1448                 link_count = 1;
1449         }
1450         set_nlink(inode, link_count);
1451
1452         inode->i_size = le64_to_cpu(fe->informationLength);
1453         iinfo->i_lenExtents = inode->i_size;
1454
1455         if (iinfo->i_efe == 0) {
1456                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1457                         (inode->i_sb->s_blocksize_bits - 9);
1458
1459                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1460                         inode->i_atime = sbi->s_record_time;
1461
1462                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1463                                             fe->modificationTime))
1464                         inode->i_mtime = sbi->s_record_time;
1465
1466                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1467                         inode->i_ctime = sbi->s_record_time;
1468
1469                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1470                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1471                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1472                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1473         } else {
1474                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1475                     (inode->i_sb->s_blocksize_bits - 9);
1476
1477                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1478                         inode->i_atime = sbi->s_record_time;
1479
1480                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1481                                             efe->modificationTime))
1482                         inode->i_mtime = sbi->s_record_time;
1483
1484                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1485                         iinfo->i_crtime = sbi->s_record_time;
1486
1487                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1488                         inode->i_ctime = sbi->s_record_time;
1489
1490                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1491                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1492                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1493                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1494         }
1495         inode->i_generation = iinfo->i_unique;
1496
1497         /*
1498          * Sanity check length of allocation descriptors and extended attrs to
1499          * avoid integer overflows
1500          */
1501         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1502                 goto out;
1503         /* Now do exact checks */
1504         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1505                 goto out;
1506         /* Sanity checks for files in ICB so that we don't get confused later */
1507         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1508                 /*
1509                  * For file in ICB data is stored in allocation descriptor
1510                  * so sizes should match
1511                  */
1512                 if (iinfo->i_lenAlloc != inode->i_size)
1513                         goto out;
1514                 /* File in ICB has to fit in there... */
1515                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1516                         goto out;
1517         }
1518
1519         switch (fe->icbTag.fileType) {
1520         case ICBTAG_FILE_TYPE_DIRECTORY:
1521                 inode->i_op = &udf_dir_inode_operations;
1522                 inode->i_fop = &udf_dir_operations;
1523                 inode->i_mode |= S_IFDIR;
1524                 inc_nlink(inode);
1525                 break;
1526         case ICBTAG_FILE_TYPE_REALTIME:
1527         case ICBTAG_FILE_TYPE_REGULAR:
1528         case ICBTAG_FILE_TYPE_UNDEF:
1529         case ICBTAG_FILE_TYPE_VAT20:
1530                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1531                         inode->i_data.a_ops = &udf_adinicb_aops;
1532                 else
1533                         inode->i_data.a_ops = &udf_aops;
1534                 inode->i_op = &udf_file_inode_operations;
1535                 inode->i_fop = &udf_file_operations;
1536                 inode->i_mode |= S_IFREG;
1537                 break;
1538         case ICBTAG_FILE_TYPE_BLOCK:
1539                 inode->i_mode |= S_IFBLK;
1540                 break;
1541         case ICBTAG_FILE_TYPE_CHAR:
1542                 inode->i_mode |= S_IFCHR;
1543                 break;
1544         case ICBTAG_FILE_TYPE_FIFO:
1545                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1546                 break;
1547         case ICBTAG_FILE_TYPE_SOCKET:
1548                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1549                 break;
1550         case ICBTAG_FILE_TYPE_SYMLINK:
1551                 inode->i_data.a_ops = &udf_symlink_aops;
1552                 inode->i_op = &page_symlink_inode_operations;
1553                 inode_nohighmem(inode);
1554                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1555                 break;
1556         case ICBTAG_FILE_TYPE_MAIN:
1557                 udf_debug("METADATA FILE-----\n");
1558                 break;
1559         case ICBTAG_FILE_TYPE_MIRROR:
1560                 udf_debug("METADATA MIRROR FILE-----\n");
1561                 break;
1562         case ICBTAG_FILE_TYPE_BITMAP:
1563                 udf_debug("METADATA BITMAP FILE-----\n");
1564                 break;
1565         default:
1566                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1567                         inode->i_ino, fe->icbTag.fileType);
1568                 goto out;
1569         }
1570         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1571                 struct deviceSpec *dsea =
1572                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1573                 if (dsea) {
1574                         init_special_inode(inode, inode->i_mode,
1575                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1576                                       le32_to_cpu(dsea->minorDeviceIdent)));
1577                         /* Developer ID ??? */
1578                 } else
1579                         goto out;
1580         }
1581         ret = 0;
1582 out:
1583         brelse(bh);
1584         return ret;
1585 }
1586
1587 static int udf_alloc_i_data(struct inode *inode, size_t size)
1588 {
1589         struct udf_inode_info *iinfo = UDF_I(inode);
1590         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1591
1592         if (!iinfo->i_ext.i_data) {
1593                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1594                         inode->i_ino);
1595                 return -ENOMEM;
1596         }
1597
1598         return 0;
1599 }
1600
1601 static umode_t udf_convert_permissions(struct fileEntry *fe)
1602 {
1603         umode_t mode;
1604         uint32_t permissions;
1605         uint32_t flags;
1606
1607         permissions = le32_to_cpu(fe->permissions);
1608         flags = le16_to_cpu(fe->icbTag.flags);
1609
1610         mode =  ((permissions) & S_IRWXO) |
1611                 ((permissions >> 2) & S_IRWXG) |
1612                 ((permissions >> 4) & S_IRWXU) |
1613                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1614                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1615                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1616
1617         return mode;
1618 }
1619
1620 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1621 {
1622         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1623 }
1624
1625 static int udf_sync_inode(struct inode *inode)
1626 {
1627         return udf_update_inode(inode, 1);
1628 }
1629
1630 static int udf_update_inode(struct inode *inode, int do_sync)
1631 {
1632         struct buffer_head *bh = NULL;
1633         struct fileEntry *fe;
1634         struct extendedFileEntry *efe;
1635         uint64_t lb_recorded;
1636         uint32_t udfperms;
1637         uint16_t icbflags;
1638         uint16_t crclen;
1639         int err = 0;
1640         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1641         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1642         struct udf_inode_info *iinfo = UDF_I(inode);
1643
1644         bh = udf_tgetblk(inode->i_sb,
1645                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1646         if (!bh) {
1647                 udf_debug("getblk failure\n");
1648                 return -EIO;
1649         }
1650
1651         lock_buffer(bh);
1652         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1653         fe = (struct fileEntry *)bh->b_data;
1654         efe = (struct extendedFileEntry *)bh->b_data;
1655
1656         if (iinfo->i_use) {
1657                 struct unallocSpaceEntry *use =
1658                         (struct unallocSpaceEntry *)bh->b_data;
1659
1660                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1661                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1662                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1663                                         sizeof(struct unallocSpaceEntry));
1664                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1665                 crclen = sizeof(struct unallocSpaceEntry);
1666
1667                 goto finish;
1668         }
1669
1670         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1671                 fe->uid = cpu_to_le32(-1);
1672         else
1673                 fe->uid = cpu_to_le32(i_uid_read(inode));
1674
1675         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1676                 fe->gid = cpu_to_le32(-1);
1677         else
1678                 fe->gid = cpu_to_le32(i_gid_read(inode));
1679
1680         udfperms = ((inode->i_mode & S_IRWXO)) |
1681                    ((inode->i_mode & S_IRWXG) << 2) |
1682                    ((inode->i_mode & S_IRWXU) << 4);
1683
1684         udfperms |= (le32_to_cpu(fe->permissions) &
1685                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1686                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1687                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1688         fe->permissions = cpu_to_le32(udfperms);
1689
1690         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1691                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1692         else
1693                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1694
1695         fe->informationLength = cpu_to_le64(inode->i_size);
1696
1697         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1698                 struct regid *eid;
1699                 struct deviceSpec *dsea =
1700                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1701                 if (!dsea) {
1702                         dsea = (struct deviceSpec *)
1703                                 udf_add_extendedattr(inode,
1704                                                      sizeof(struct deviceSpec) +
1705                                                      sizeof(struct regid), 12, 0x3);
1706                         dsea->attrType = cpu_to_le32(12);
1707                         dsea->attrSubtype = 1;
1708                         dsea->attrLength = cpu_to_le32(
1709                                                 sizeof(struct deviceSpec) +
1710                                                 sizeof(struct regid));
1711                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1712                 }
1713                 eid = (struct regid *)dsea->impUse;
1714                 memset(eid, 0, sizeof(struct regid));
1715                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1716                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1717                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1718                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1719                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1720         }
1721
1722         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1723                 lb_recorded = 0; /* No extents => no blocks! */
1724         else
1725                 lb_recorded =
1726                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1727                         (blocksize_bits - 9);
1728
1729         if (iinfo->i_efe == 0) {
1730                 memcpy(bh->b_data + sizeof(struct fileEntry),
1731                        iinfo->i_ext.i_data,
1732                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1733                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1734
1735                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1736                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1737                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1738                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1739                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1740                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1741                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1742                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1743                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1744                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1745                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1746                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1747                 crclen = sizeof(struct fileEntry);
1748         } else {
1749                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1750                        iinfo->i_ext.i_data,
1751                        inode->i_sb->s_blocksize -
1752                                         sizeof(struct extendedFileEntry));
1753                 efe->objectSize = cpu_to_le64(inode->i_size);
1754                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1755
1756                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1757                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1758                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1759                         iinfo->i_crtime = inode->i_atime;
1760
1761                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1762                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1763                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1764                         iinfo->i_crtime = inode->i_mtime;
1765
1766                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1767                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1768                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1769                         iinfo->i_crtime = inode->i_ctime;
1770
1771                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1772                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1773                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1774                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1775
1776                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1777                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1778                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1779                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1780                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1781                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1782                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1783                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1784                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1785                 crclen = sizeof(struct extendedFileEntry);
1786         }
1787
1788 finish:
1789         if (iinfo->i_strat4096) {
1790                 fe->icbTag.strategyType = cpu_to_le16(4096);
1791                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1792                 fe->icbTag.numEntries = cpu_to_le16(2);
1793         } else {
1794                 fe->icbTag.strategyType = cpu_to_le16(4);
1795                 fe->icbTag.numEntries = cpu_to_le16(1);
1796         }
1797
1798         if (iinfo->i_use)
1799                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1800         else if (S_ISDIR(inode->i_mode))
1801                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1802         else if (S_ISREG(inode->i_mode))
1803                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1804         else if (S_ISLNK(inode->i_mode))
1805                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1806         else if (S_ISBLK(inode->i_mode))
1807                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1808         else if (S_ISCHR(inode->i_mode))
1809                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1810         else if (S_ISFIFO(inode->i_mode))
1811                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1812         else if (S_ISSOCK(inode->i_mode))
1813                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1814
1815         icbflags =      iinfo->i_alloc_type |
1816                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1817                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1818                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1819                         (le16_to_cpu(fe->icbTag.flags) &
1820                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1821                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1822
1823         fe->icbTag.flags = cpu_to_le16(icbflags);
1824         if (sbi->s_udfrev >= 0x0200)
1825                 fe->descTag.descVersion = cpu_to_le16(3);
1826         else
1827                 fe->descTag.descVersion = cpu_to_le16(2);
1828         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1829         fe->descTag.tagLocation = cpu_to_le32(
1830                                         iinfo->i_location.logicalBlockNum);
1831         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1832         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1833         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1834                                                   crclen));
1835         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1836
1837         set_buffer_uptodate(bh);
1838         unlock_buffer(bh);
1839
1840         /* write the data blocks */
1841         mark_buffer_dirty(bh);
1842         if (do_sync) {
1843                 sync_dirty_buffer(bh);
1844                 if (buffer_write_io_error(bh)) {
1845                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1846                                  inode->i_ino);
1847                         err = -EIO;
1848                 }
1849         }
1850         brelse(bh);
1851
1852         return err;
1853 }
1854
1855 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1856                          bool hidden_inode)
1857 {
1858         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1859         struct inode *inode = iget_locked(sb, block);
1860         int err;
1861
1862         if (!inode)
1863                 return ERR_PTR(-ENOMEM);
1864
1865         if (!(inode->i_state & I_NEW))
1866                 return inode;
1867
1868         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1869         err = udf_read_inode(inode, hidden_inode);
1870         if (err < 0) {
1871                 iget_failed(inode);
1872                 return ERR_PTR(err);
1873         }
1874         unlock_new_inode(inode);
1875
1876         return inode;
1877 }
1878
1879 int udf_setup_indirect_aext(struct inode *inode, int block,
1880                             struct extent_position *epos)
1881 {
1882         struct super_block *sb = inode->i_sb;
1883         struct buffer_head *bh;
1884         struct allocExtDesc *aed;
1885         struct extent_position nepos;
1886         struct kernel_lb_addr neloc;
1887         int ver, adsize;
1888
1889         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1890                 adsize = sizeof(struct short_ad);
1891         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1892                 adsize = sizeof(struct long_ad);
1893         else
1894                 return -EIO;
1895
1896         neloc.logicalBlockNum = block;
1897         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1898
1899         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1900         if (!bh)
1901                 return -EIO;
1902         lock_buffer(bh);
1903         memset(bh->b_data, 0x00, sb->s_blocksize);
1904         set_buffer_uptodate(bh);
1905         unlock_buffer(bh);
1906         mark_buffer_dirty_inode(bh, inode);
1907
1908         aed = (struct allocExtDesc *)(bh->b_data);
1909         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1910                 aed->previousAllocExtLocation =
1911                                 cpu_to_le32(epos->block.logicalBlockNum);
1912         }
1913         aed->lengthAllocDescs = cpu_to_le32(0);
1914         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1915                 ver = 3;
1916         else
1917                 ver = 2;
1918         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1919                     sizeof(struct tag));
1920
1921         nepos.block = neloc;
1922         nepos.offset = sizeof(struct allocExtDesc);
1923         nepos.bh = bh;
1924
1925         /*
1926          * Do we have to copy current last extent to make space for indirect
1927          * one?
1928          */
1929         if (epos->offset + adsize > sb->s_blocksize) {
1930                 struct kernel_lb_addr cp_loc;
1931                 uint32_t cp_len;
1932                 int cp_type;
1933
1934                 epos->offset -= adsize;
1935                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1936                 cp_len |= ((uint32_t)cp_type) << 30;
1937
1938                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1939                 udf_write_aext(inode, epos, &nepos.block,
1940                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1941         } else {
1942                 __udf_add_aext(inode, epos, &nepos.block,
1943                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1944         }
1945
1946         brelse(epos->bh);
1947         *epos = nepos;
1948
1949         return 0;
1950 }
1951
1952 /*
1953  * Append extent at the given position - should be the first free one in inode
1954  * / indirect extent. This function assumes there is enough space in the inode
1955  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1956  */
1957 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1958                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1959 {
1960         struct udf_inode_info *iinfo = UDF_I(inode);
1961         struct allocExtDesc *aed;
1962         int adsize;
1963
1964         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1965                 adsize = sizeof(struct short_ad);
1966         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1967                 adsize = sizeof(struct long_ad);
1968         else
1969                 return -EIO;
1970
1971         if (!epos->bh) {
1972                 WARN_ON(iinfo->i_lenAlloc !=
1973                         epos->offset - udf_file_entry_alloc_offset(inode));
1974         } else {
1975                 aed = (struct allocExtDesc *)epos->bh->b_data;
1976                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
1977                         epos->offset - sizeof(struct allocExtDesc));
1978                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
1979         }
1980
1981         udf_write_aext(inode, epos, eloc, elen, inc);
1982
1983         if (!epos->bh) {
1984                 iinfo->i_lenAlloc += adsize;
1985                 mark_inode_dirty(inode);
1986         } else {
1987                 aed = (struct allocExtDesc *)epos->bh->b_data;
1988                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
1989                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
1990                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
1991                         udf_update_tag(epos->bh->b_data,
1992                                         epos->offset + (inc ? 0 : adsize));
1993                 else
1994                         udf_update_tag(epos->bh->b_data,
1995                                         sizeof(struct allocExtDesc));
1996                 mark_buffer_dirty_inode(epos->bh, inode);
1997         }
1998
1999         return 0;
2000 }
2001
2002 /*
2003  * Append extent at given position - should be the first free one in inode
2004  * / indirect extent. Takes care of allocating and linking indirect blocks.
2005  */
2006 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2007                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2008 {
2009         int adsize;
2010         struct super_block *sb = inode->i_sb;
2011
2012         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2013                 adsize = sizeof(struct short_ad);
2014         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2015                 adsize = sizeof(struct long_ad);
2016         else
2017                 return -EIO;
2018
2019         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2020                 int err;
2021                 int new_block;
2022
2023                 new_block = udf_new_block(sb, NULL,
2024                                           epos->block.partitionReferenceNum,
2025                                           epos->block.logicalBlockNum, &err);
2026                 if (!new_block)
2027                         return -ENOSPC;
2028
2029                 err = udf_setup_indirect_aext(inode, new_block, epos);
2030                 if (err)
2031                         return err;
2032         }
2033
2034         return __udf_add_aext(inode, epos, eloc, elen, inc);
2035 }
2036
2037 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2038                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2039 {
2040         int adsize;
2041         uint8_t *ptr;
2042         struct short_ad *sad;
2043         struct long_ad *lad;
2044         struct udf_inode_info *iinfo = UDF_I(inode);
2045
2046         if (!epos->bh)
2047                 ptr = iinfo->i_ext.i_data + epos->offset -
2048                         udf_file_entry_alloc_offset(inode) +
2049                         iinfo->i_lenEAttr;
2050         else
2051                 ptr = epos->bh->b_data + epos->offset;
2052
2053         switch (iinfo->i_alloc_type) {
2054         case ICBTAG_FLAG_AD_SHORT:
2055                 sad = (struct short_ad *)ptr;
2056                 sad->extLength = cpu_to_le32(elen);
2057                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2058                 adsize = sizeof(struct short_ad);
2059                 break;
2060         case ICBTAG_FLAG_AD_LONG:
2061                 lad = (struct long_ad *)ptr;
2062                 lad->extLength = cpu_to_le32(elen);
2063                 lad->extLocation = cpu_to_lelb(*eloc);
2064                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2065                 adsize = sizeof(struct long_ad);
2066                 break;
2067         default:
2068                 return;
2069         }
2070
2071         if (epos->bh) {
2072                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2073                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2074                         struct allocExtDesc *aed =
2075                                 (struct allocExtDesc *)epos->bh->b_data;
2076                         udf_update_tag(epos->bh->b_data,
2077                                        le32_to_cpu(aed->lengthAllocDescs) +
2078                                        sizeof(struct allocExtDesc));
2079                 }
2080                 mark_buffer_dirty_inode(epos->bh, inode);
2081         } else {
2082                 mark_inode_dirty(inode);
2083         }
2084
2085         if (inc)
2086                 epos->offset += adsize;
2087 }
2088
2089 /*
2090  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2091  * someone does some weird stuff.
2092  */
2093 #define UDF_MAX_INDIR_EXTS 16
2094
2095 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2096                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2097 {
2098         int8_t etype;
2099         unsigned int indirections = 0;
2100
2101         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2102                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2103                 int block;
2104
2105                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2106                         udf_err(inode->i_sb,
2107                                 "too many indirect extents in inode %lu\n",
2108                                 inode->i_ino);
2109                         return -1;
2110                 }
2111
2112                 epos->block = *eloc;
2113                 epos->offset = sizeof(struct allocExtDesc);
2114                 brelse(epos->bh);
2115                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2116                 epos->bh = udf_tread(inode->i_sb, block);
2117                 if (!epos->bh) {
2118                         udf_debug("reading block %d failed!\n", block);
2119                         return -1;
2120                 }
2121         }
2122
2123         return etype;
2124 }
2125
2126 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2127                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2128 {
2129         int alen;
2130         int8_t etype;
2131         uint8_t *ptr;
2132         struct short_ad *sad;
2133         struct long_ad *lad;
2134         struct udf_inode_info *iinfo = UDF_I(inode);
2135
2136         if (!epos->bh) {
2137                 if (!epos->offset)
2138                         epos->offset = udf_file_entry_alloc_offset(inode);
2139                 ptr = iinfo->i_ext.i_data + epos->offset -
2140                         udf_file_entry_alloc_offset(inode) +
2141                         iinfo->i_lenEAttr;
2142                 alen = udf_file_entry_alloc_offset(inode) +
2143                                                         iinfo->i_lenAlloc;
2144         } else {
2145                 if (!epos->offset)
2146                         epos->offset = sizeof(struct allocExtDesc);
2147                 ptr = epos->bh->b_data + epos->offset;
2148                 alen = sizeof(struct allocExtDesc) +
2149                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2150                                                         lengthAllocDescs);
2151         }
2152
2153         switch (iinfo->i_alloc_type) {
2154         case ICBTAG_FLAG_AD_SHORT:
2155                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2156                 if (!sad)
2157                         return -1;
2158                 etype = le32_to_cpu(sad->extLength) >> 30;
2159                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2160                 eloc->partitionReferenceNum =
2161                                 iinfo->i_location.partitionReferenceNum;
2162                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2163                 break;
2164         case ICBTAG_FLAG_AD_LONG:
2165                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2166                 if (!lad)
2167                         return -1;
2168                 etype = le32_to_cpu(lad->extLength) >> 30;
2169                 *eloc = lelb_to_cpu(lad->extLocation);
2170                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2171                 break;
2172         default:
2173                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2174                 return -1;
2175         }
2176
2177         return etype;
2178 }
2179
2180 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2181                               struct kernel_lb_addr neloc, uint32_t nelen)
2182 {
2183         struct kernel_lb_addr oeloc;
2184         uint32_t oelen;
2185         int8_t etype;
2186
2187         if (epos.bh)
2188                 get_bh(epos.bh);
2189
2190         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2191                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2192                 neloc = oeloc;
2193                 nelen = (etype << 30) | oelen;
2194         }
2195         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2196         brelse(epos.bh);
2197
2198         return (nelen >> 30);
2199 }
2200
2201 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2202                        struct kernel_lb_addr eloc, uint32_t elen)
2203 {
2204         struct extent_position oepos;
2205         int adsize;
2206         int8_t etype;
2207         struct allocExtDesc *aed;
2208         struct udf_inode_info *iinfo;
2209
2210         if (epos.bh) {
2211                 get_bh(epos.bh);
2212                 get_bh(epos.bh);
2213         }
2214
2215         iinfo = UDF_I(inode);
2216         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2217                 adsize = sizeof(struct short_ad);
2218         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2219                 adsize = sizeof(struct long_ad);
2220         else
2221                 adsize = 0;
2222
2223         oepos = epos;
2224         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2225                 return -1;
2226
2227         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2228                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2229                 if (oepos.bh != epos.bh) {
2230                         oepos.block = epos.block;
2231                         brelse(oepos.bh);
2232                         get_bh(epos.bh);
2233                         oepos.bh = epos.bh;
2234                         oepos.offset = epos.offset - adsize;
2235                 }
2236         }
2237         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2238         elen = 0;
2239
2240         if (epos.bh != oepos.bh) {
2241                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2242                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2243                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2244                 if (!oepos.bh) {
2245                         iinfo->i_lenAlloc -= (adsize * 2);
2246                         mark_inode_dirty(inode);
2247                 } else {
2248                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2249                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2250                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2251                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2252                                 udf_update_tag(oepos.bh->b_data,
2253                                                 oepos.offset - (2 * adsize));
2254                         else
2255                                 udf_update_tag(oepos.bh->b_data,
2256                                                 sizeof(struct allocExtDesc));
2257                         mark_buffer_dirty_inode(oepos.bh, inode);
2258                 }
2259         } else {
2260                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2261                 if (!oepos.bh) {
2262                         iinfo->i_lenAlloc -= adsize;
2263                         mark_inode_dirty(inode);
2264                 } else {
2265                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2266                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2267                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2268                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2269                                 udf_update_tag(oepos.bh->b_data,
2270                                                 epos.offset - adsize);
2271                         else
2272                                 udf_update_tag(oepos.bh->b_data,
2273                                                 sizeof(struct allocExtDesc));
2274                         mark_buffer_dirty_inode(oepos.bh, inode);
2275                 }
2276         }
2277
2278         brelse(epos.bh);
2279         brelse(oepos.bh);
2280
2281         return (elen >> 30);
2282 }
2283
2284 int8_t inode_bmap(struct inode *inode, sector_t block,
2285                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2286                   uint32_t *elen, sector_t *offset)
2287 {
2288         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2289         loff_t lbcount = 0, bcount =
2290             (loff_t) block << blocksize_bits;
2291         int8_t etype;
2292         struct udf_inode_info *iinfo;
2293
2294         iinfo = UDF_I(inode);
2295         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2296                 pos->offset = 0;
2297                 pos->block = iinfo->i_location;
2298                 pos->bh = NULL;
2299         }
2300         *elen = 0;
2301         do {
2302                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2303                 if (etype == -1) {
2304                         *offset = (bcount - lbcount) >> blocksize_bits;
2305                         iinfo->i_lenExtents = lbcount;
2306                         return -1;
2307                 }
2308                 lbcount += *elen;
2309         } while (lbcount <= bcount);
2310         /* update extent cache */
2311         udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2312         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2313
2314         return etype;
2315 }
2316
2317 long udf_block_map(struct inode *inode, sector_t block)
2318 {
2319         struct kernel_lb_addr eloc;
2320         uint32_t elen;
2321         sector_t offset;
2322         struct extent_position epos = {};
2323         int ret;
2324
2325         down_read(&UDF_I(inode)->i_data_sem);
2326
2327         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2328                                                 (EXT_RECORDED_ALLOCATED >> 30))
2329                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2330         else
2331                 ret = 0;
2332
2333         up_read(&UDF_I(inode)->i_data_sem);
2334         brelse(epos.bh);
2335
2336         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2337                 return udf_fixed_to_variable(ret);
2338         else
2339                 return ret;
2340 }