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 #define EXTENT_MERGE_SIZE 5
  47
  48 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
  49                          FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
  50                          FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
  51
  52 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
  53                          FE_PERM_O_DELETE)
  54
  55 static umode_t udf_convert_permissions(struct fileEntry *);
  56 static int udf_update_inode(struct inode *, int);
  57 static int udf_sync_inode(struct inode *inode);
  58 static int udf_alloc_i_data(struct inode *inode, size_t size);
  59 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  60 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  61                               struct kernel_lb_addr, uint32_t);
  62 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
  63                               struct kernel_long_ad *, int *);
  64 static void udf_prealloc_extents(struct inode *, int, int,
  65                                  struct kernel_long_ad *, int *);
  66 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  67 static void udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  68                                int, struct extent_position *);
  69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  70
  71 static void __udf_clear_extent_cache(struct inode *inode)
  72 {
  73         struct udf_inode_info *iinfo = UDF_I(inode);
  74
  75         if (iinfo->cached_extent.lstart != -1) {
  76                 brelse(iinfo->cached_extent.epos.bh);
  77                 iinfo->cached_extent.lstart = -1;
  78         }
  79 }
  80
  81 /* Invalidate extent cache */
  82 static void udf_clear_extent_cache(struct inode *inode)
  83 {
  84         struct udf_inode_info *iinfo = UDF_I(inode);
  85
  86         spin_lock(&iinfo->i_extent_cache_lock);
  87         __udf_clear_extent_cache(inode);
  88         spin_unlock(&iinfo->i_extent_cache_lock);
  89 }
  90
  91 /* Return contents of extent cache */
  92 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  93                                  loff_t *lbcount, struct extent_position *pos)
  94 {
  95         struct udf_inode_info *iinfo = UDF_I(inode);
  96         int ret = 0;
  97
  98         spin_lock(&iinfo->i_extent_cache_lock);
  99         if ((iinfo->cached_extent.lstart <= bcount) &&
 100             (iinfo->cached_extent.lstart != -1)) {
 101                 /* Cache hit */
 102                 *lbcount = iinfo->cached_extent.lstart;
 103                 memcpy(pos, &iinfo->cached_extent.epos,
 104                        sizeof(struct extent_position));
 105                 if (pos->bh)
 106                         get_bh(pos->bh);
 107                 ret = 1;
 108         }
 109         spin_unlock(&iinfo->i_extent_cache_lock);
 110         return ret;
 111 }
 112
 113 /* Add extent to extent cache */
 114 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 115                                     struct extent_position *pos)
 116 {
 117         struct udf_inode_info *iinfo = UDF_I(inode);
 118
 119         spin_lock(&iinfo->i_extent_cache_lock);
 120         /* Invalidate previously cached extent */
 121         __udf_clear_extent_cache(inode);
 122         if (pos->bh)
 123                 get_bh(pos->bh);
 124         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 125         iinfo->cached_extent.lstart = estart;
 126         switch (iinfo->i_alloc_type) {
 127         case ICBTAG_FLAG_AD_SHORT:
 128                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 129                 break;
 130         case ICBTAG_FLAG_AD_LONG:
 131                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 132                 break;
 133         }
 134         spin_unlock(&iinfo->i_extent_cache_lock);
 135 }
 136
 137 void udf_evict_inode(struct inode *inode)
 138 {
 139         struct udf_inode_info *iinfo = UDF_I(inode);
 140         int want_delete = 0;
 141
 142         if (!is_bad_inode(inode)) {
 143                 if (!inode->i_nlink) {
 144                         want_delete = 1;
 145                         udf_setsize(inode, 0);
 146                         udf_update_inode(inode, IS_SYNC(inode));
 147                 }
 148                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 149                     inode->i_size != iinfo->i_lenExtents) {
 150                         udf_warn(inode->i_sb,
 151                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 152                                  inode->i_ino, inode->i_mode,
 153                                  (unsigned long long)inode->i_size,
 154                                  (unsigned long long)iinfo->i_lenExtents);
 155                 }
 156         }
 157         truncate_inode_pages_final(&inode->i_data);
 158         invalidate_inode_buffers(inode);
 159         clear_inode(inode);
 160         kfree(iinfo->i_data);
 161         iinfo->i_data = NULL;
 162         udf_clear_extent_cache(inode);
 163         if (want_delete) {
 164                 udf_free_inode(inode);
 165         }
 166 }
 167
 168 static void udf_write_failed(struct address_space *mapping, loff_t to)
 169 {
 170         struct inode *inode = mapping->host;
 171         struct udf_inode_info *iinfo = UDF_I(inode);
 172         loff_t isize = inode->i_size;
 173
 174         if (to > isize) {
 175                 truncate_pagecache(inode, isize);
 176                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 177                         down_write(&iinfo->i_data_sem);
 178                         udf_clear_extent_cache(inode);
 179                         udf_truncate_extents(inode);
 180                         up_write(&iinfo->i_data_sem);
 181                 }
 182         }
 183 }
 184
 185 static int udf_writepages(struct address_space *mapping,
 186                         struct writeback_control *wbc)
 187 {
 188         return mpage_writepages(mapping, wbc, udf_get_block);
 189 }
 190
 191 static int udf_read_folio(struct file *file, struct folio *folio)
 192 {
 193         return mpage_read_folio(folio, udf_get_block);
 194 }
 195
 196 static void udf_readahead(struct readahead_control *rac)
 197 {
 198         mpage_readahead(rac, udf_get_block);
 199 }
 200
 201 static int udf_write_begin(struct file *file, struct address_space *mapping,
 202                         loff_t pos, unsigned len,
 203                         struct page **pagep, void **fsdata)
 204 {
 205         int ret;
 206
 207         ret = block_write_begin(mapping, pos, len, pagep, udf_get_block);
 208         if (unlikely(ret))
 209                 udf_write_failed(mapping, pos + len);
 210         return ret;
 211 }
 212
 213 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 214 {
 215         struct file *file = iocb->ki_filp;
 216         struct address_space *mapping = file->f_mapping;
 217         struct inode *inode = mapping->host;
 218         size_t count = iov_iter_count(iter);
 219         ssize_t ret;
 220
 221         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 222         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 223                 udf_write_failed(mapping, iocb->ki_pos + count);
 224         return ret;
 225 }
 226
 227 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 228 {
 229         return generic_block_bmap(mapping, block, udf_get_block);
 230 }
 231
 232 const struct address_space_operations udf_aops = {
 233         .dirty_folio    = block_dirty_folio,
 234         .invalidate_folio = block_invalidate_folio,
 235         .read_folio     = udf_read_folio,
 236         .readahead      = udf_readahead,
 237         .writepages     = udf_writepages,
 238         .write_begin    = udf_write_begin,
 239         .write_end      = generic_write_end,
 240         .direct_IO      = udf_direct_IO,
 241         .bmap           = udf_bmap,
 242         .migrate_folio  = buffer_migrate_folio,
 243 };
 244
 245 /*
 246  * Expand file stored in ICB to a normal one-block-file
 247  *
 248  * This function requires i_data_sem for writing and releases it.
 249  * This function requires i_mutex held
 250  */
 251 int udf_expand_file_adinicb(struct inode *inode)
 252 {
 253         struct page *page;
 254         char *kaddr;
 255         struct udf_inode_info *iinfo = UDF_I(inode);
 256         int err;
 257
 258         WARN_ON_ONCE(!inode_is_locked(inode));
 259         if (!iinfo->i_lenAlloc) {
 260                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 261                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 262                 else
 263                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 264                 /* from now on we have normal address_space methods */
 265                 inode->i_data.a_ops = &udf_aops;
 266                 up_write(&iinfo->i_data_sem);
 267                 mark_inode_dirty(inode);
 268                 return 0;
 269         }
 270         /*
 271          * Release i_data_sem so that we can lock a page - page lock ranks
 272          * above i_data_sem. i_mutex still protects us against file changes.
 273          */
 274         up_write(&iinfo->i_data_sem);
 275
 276         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 277         if (!page)
 278                 return -ENOMEM;
 279
 280         if (!PageUptodate(page)) {
 281                 kaddr = kmap_atomic(page);
 282                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 283                        PAGE_SIZE - iinfo->i_lenAlloc);
 284                 memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr,
 285                         iinfo->i_lenAlloc);
 286                 flush_dcache_page(page);
 287                 SetPageUptodate(page);
 288                 kunmap_atomic(kaddr);
 289         }
 290         down_write(&iinfo->i_data_sem);
 291         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 292                iinfo->i_lenAlloc);
 293         iinfo->i_lenAlloc = 0;
 294         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 295                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 296         else
 297                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 298         /* from now on we have normal address_space methods */
 299         inode->i_data.a_ops = &udf_aops;
 300         set_page_dirty(page);
 301         unlock_page(page);
 302         up_write(&iinfo->i_data_sem);
 303         err = filemap_fdatawrite(inode->i_mapping);
 304         if (err) {
 305                 /* Restore everything back so that we don't lose data... */
 306                 lock_page(page);
 307                 down_write(&iinfo->i_data_sem);
 308                 kaddr = kmap_atomic(page);
 309                 memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
 310                 kunmap_atomic(kaddr);
 311                 unlock_page(page);
 312                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 313                 inode->i_data.a_ops = &udf_adinicb_aops;
 314                 iinfo->i_lenAlloc = inode->i_size;
 315                 up_write(&iinfo->i_data_sem);
 316         }
 317         put_page(page);
 318         mark_inode_dirty(inode);
 319
 320         return err;
 321 }
 322
 323 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
 324                                             udf_pblk_t *block, int *err)
 325 {
 326         udf_pblk_t newblock;
 327         struct buffer_head *dbh = NULL;
 328         struct kernel_lb_addr eloc;
 329         uint8_t alloctype;
 330         struct extent_position epos;
 331
 332         struct udf_fileident_bh sfibh, dfibh;
 333         loff_t f_pos = udf_ext0_offset(inode);
 334         int size = udf_ext0_offset(inode) + inode->i_size;
 335         struct fileIdentDesc cfi, *sfi, *dfi;
 336         struct udf_inode_info *iinfo = UDF_I(inode);
 337
 338         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 339                 alloctype = ICBTAG_FLAG_AD_SHORT;
 340         else
 341                 alloctype = ICBTAG_FLAG_AD_LONG;
 342
 343         if (!inode->i_size) {
 344                 iinfo->i_alloc_type = alloctype;
 345                 mark_inode_dirty(inode);
 346                 return NULL;
 347         }
 348
 349         /* alloc block, and copy data to it */
 350         *block = udf_new_block(inode->i_sb, inode,
 351                                iinfo->i_location.partitionReferenceNum,
 352                                iinfo->i_location.logicalBlockNum, err);
 353         if (!(*block))
 354                 return NULL;
 355         newblock = udf_get_pblock(inode->i_sb, *block,
 356                                   iinfo->i_location.partitionReferenceNum,
 357                                 0);
 358         if (!newblock)
 359                 return NULL;
 360         dbh = udf_tgetblk(inode->i_sb, newblock);
 361         if (!dbh)
 362                 return NULL;
 363         lock_buffer(dbh);
 364         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 365         set_buffer_uptodate(dbh);
 366         unlock_buffer(dbh);
 367         mark_buffer_dirty_inode(dbh, inode);
 368
 369         sfibh.soffset = sfibh.eoffset =
 370                         f_pos & (inode->i_sb->s_blocksize - 1);
 371         sfibh.sbh = sfibh.ebh = NULL;
 372         dfibh.soffset = dfibh.eoffset = 0;
 373         dfibh.sbh = dfibh.ebh = dbh;
 374         while (f_pos < size) {
 375                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 376                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 377                                          NULL, NULL, NULL);
 378                 if (!sfi) {
 379                         brelse(dbh);
 380                         return NULL;
 381                 }
 382                 iinfo->i_alloc_type = alloctype;
 383                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 384                 dfibh.soffset = dfibh.eoffset;
 385                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 386                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 387                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 388                                  udf_get_fi_ident(sfi))) {
 389                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 390                         brelse(dbh);
 391                         return NULL;
 392                 }
 393         }
 394         mark_buffer_dirty_inode(dbh, inode);
 395
 396         memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
 397         iinfo->i_lenAlloc = 0;
 398         eloc.logicalBlockNum = *block;
 399         eloc.partitionReferenceNum =
 400                                 iinfo->i_location.partitionReferenceNum;
 401         iinfo->i_lenExtents = inode->i_size;
 402         epos.bh = NULL;
 403         epos.block = iinfo->i_location;
 404         epos.offset = udf_file_entry_alloc_offset(inode);
 405         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 406         /* UniqueID stuff */
 407
 408         brelse(epos.bh);
 409         mark_inode_dirty(inode);
 410         return dbh;
 411 }
 412
 413 static int udf_get_block(struct inode *inode, sector_t block,
 414                          struct buffer_head *bh_result, int create)
 415 {
 416         int err, new;
 417         sector_t phys = 0;
 418         struct udf_inode_info *iinfo;
 419
 420         if (!create) {
 421                 phys = udf_block_map(inode, block);
 422                 if (phys)
 423                         map_bh(bh_result, inode->i_sb, phys);
 424                 return 0;
 425         }
 426
 427         err = -EIO;
 428         new = 0;
 429         iinfo = UDF_I(inode);
 430
 431         down_write(&iinfo->i_data_sem);
 432         if (block == iinfo->i_next_alloc_block + 1) {
 433                 iinfo->i_next_alloc_block++;
 434                 iinfo->i_next_alloc_goal++;
 435         }
 436
 437         /*
 438          * Block beyond EOF and prealloc extents? Just discard preallocation
 439          * as it is not useful and complicates things.
 440          */
 441         if (((loff_t)block) << inode->i_blkbits > iinfo->i_lenExtents)
 442                 udf_discard_prealloc(inode);
 443         udf_clear_extent_cache(inode);
 444         phys = inode_getblk(inode, block, &err, &new);
 445         if (!phys)
 446                 goto abort;
 447
 448         if (new)
 449                 set_buffer_new(bh_result);
 450         map_bh(bh_result, inode->i_sb, phys);
 451
 452 abort:
 453         up_write(&iinfo->i_data_sem);
 454         return err;
 455 }
 456
 457 static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
 458                                       int create, int *err)
 459 {
 460         struct buffer_head *bh;
 461         struct buffer_head dummy;
 462
 463         dummy.b_state = 0;
 464         dummy.b_blocknr = -1000;
 465         *err = udf_get_block(inode, block, &dummy, create);
 466         if (!*err && buffer_mapped(&dummy)) {
 467                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 468                 if (buffer_new(&dummy)) {
 469                         lock_buffer(bh);
 470                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 471                         set_buffer_uptodate(bh);
 472                         unlock_buffer(bh);
 473                         mark_buffer_dirty_inode(bh, inode);
 474                 }
 475                 return bh;
 476         }
 477
 478         return NULL;
 479 }
 480
 481 /* Extend the file with new blocks totaling 'new_block_bytes',
 482  * return the number of extents added
 483  */
 484 static int udf_do_extend_file(struct inode *inode,
 485                               struct extent_position *last_pos,
 486                               struct kernel_long_ad *last_ext,
 487                               loff_t new_block_bytes)
 488 {
 489         uint32_t add;
 490         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 491         struct super_block *sb = inode->i_sb;
 492         struct udf_inode_info *iinfo;
 493         int err;
 494
 495         /* The previous extent is fake and we should not extend by anything
 496          * - there's nothing to do... */
 497         if (!new_block_bytes && fake)
 498                 return 0;
 499
 500         iinfo = UDF_I(inode);
 501         /* Round the last extent up to a multiple of block size */
 502         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 503                 last_ext->extLength =
 504                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 505                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 506                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 507                 iinfo->i_lenExtents =
 508                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 509                         ~(sb->s_blocksize - 1);
 510         }
 511
 512         /* Can we merge with the previous extent? */
 513         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 514                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 515                 add = (1 << 30) - sb->s_blocksize -
 516                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 517                 if (add > new_block_bytes)
 518                         add = new_block_bytes;
 519                 new_block_bytes -= add;
 520                 last_ext->extLength += add;
 521         }
 522
 523         if (fake) {
 524                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 525                              last_ext->extLength, 1);
 526                 count++;
 527         } else {
 528                 struct kernel_lb_addr tmploc;
 529                 uint32_t tmplen;
 530
 531                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 532                                 last_ext->extLength, 1);
 533
 534                 /*
 535                  * We've rewritten the last extent. If we are going to add
 536                  * more extents, we may need to enter possible following
 537                  * empty indirect extent.
 538                  */
 539                 if (new_block_bytes)
 540                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 541         }
 542
 543         /* Managed to do everything necessary? */
 544         if (!new_block_bytes)
 545                 goto out;
 546
 547         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 548         last_ext->extLocation.logicalBlockNum = 0;
 549         last_ext->extLocation.partitionReferenceNum = 0;
 550         add = (1 << 30) - sb->s_blocksize;
 551         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 552
 553         /* Create enough extents to cover the whole hole */
 554         while (new_block_bytes > add) {
 555                 new_block_bytes -= add;
 556                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 557                                    last_ext->extLength, 1);
 558                 if (err)
 559                         return err;
 560                 count++;
 561         }
 562         if (new_block_bytes) {
 563                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 564                         new_block_bytes;
 565                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 566                                    last_ext->extLength, 1);
 567                 if (err)
 568                         return err;
 569                 count++;
 570         }
 571
 572 out:
 573         /* last_pos should point to the last written extent... */
 574         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 575                 last_pos->offset -= sizeof(struct short_ad);
 576         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 577                 last_pos->offset -= sizeof(struct long_ad);
 578         else
 579                 return -EIO;
 580
 581         return count;
 582 }
 583
 584 /* Extend the final block of the file to final_block_len bytes */
 585 static void udf_do_extend_final_block(struct inode *inode,
 586                                       struct extent_position *last_pos,
 587                                       struct kernel_long_ad *last_ext,
 588                                       uint32_t new_elen)
 589 {
 590         uint32_t added_bytes;
 591
 592         /*
 593          * Extent already large enough? It may be already rounded up to block
 594          * size...
 595          */
 596         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 597                 return;
 598         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 599         last_ext->extLength += added_bytes;
 600         UDF_I(inode)->i_lenExtents += added_bytes;
 601
 602         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 603                         last_ext->extLength, 1);
 604 }
 605
 606 static int udf_extend_file(struct inode *inode, loff_t newsize)
 607 {
 608
 609         struct extent_position epos;
 610         struct kernel_lb_addr eloc;
 611         uint32_t elen;
 612         int8_t etype;
 613         struct super_block *sb = inode->i_sb;
 614         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 615         loff_t new_elen;
 616         int adsize;
 617         struct udf_inode_info *iinfo = UDF_I(inode);
 618         struct kernel_long_ad extent;
 619         int err = 0;
 620         bool within_last_ext;
 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         /*
 630          * When creating hole in file, just don't bother with preserving
 631          * preallocation. It likely won't be very useful anyway.
 632          */
 633         udf_discard_prealloc(inode);
 634
 635         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 636         within_last_ext = (etype != -1);
 637         /* We don't expect extents past EOF... */
 638         WARN_ON_ONCE(within_last_ext &&
 639                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 640
 641         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 642             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 643                 /* File has no extents at all or has empty last
 644                  * indirect extent! Create a fake extent... */
 645                 extent.extLocation.logicalBlockNum = 0;
 646                 extent.extLocation.partitionReferenceNum = 0;
 647                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 648         } else {
 649                 epos.offset -= adsize;
 650                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 651                                       &extent.extLength, 0);
 652                 extent.extLength |= etype << 30;
 653         }
 654
 655         new_elen = ((loff_t)offset << inode->i_blkbits) |
 656                                         (newsize & (sb->s_blocksize - 1));
 657
 658         /* File has extent covering the new size (could happen when extending
 659          * inside a block)?
 660          */
 661         if (within_last_ext) {
 662                 /* Extending file within the last file block */
 663                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 664         } else {
 665                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 666         }
 667
 668         if (err < 0)
 669                 goto out;
 670         err = 0;
 671         iinfo->i_lenExtents = newsize;
 672 out:
 673         brelse(epos.bh);
 674         return err;
 675 }
 676
 677 static sector_t inode_getblk(struct inode *inode, sector_t block,
 678                              int *err, int *new)
 679 {
 680         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 681         struct extent_position prev_epos, cur_epos, next_epos;
 682         int count = 0, startnum = 0, endnum = 0;
 683         uint32_t elen = 0, tmpelen;
 684         struct kernel_lb_addr eloc, tmpeloc;
 685         int c = 1;
 686         loff_t lbcount = 0, b_off = 0;
 687         udf_pblk_t newblocknum, newblock = 0;
 688         sector_t offset = 0;
 689         int8_t etype;
 690         struct udf_inode_info *iinfo = UDF_I(inode);
 691         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 692         int lastblock = 0;
 693         bool isBeyondEOF;
 694
 695         *err = 0;
 696         *new = 0;
 697         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 698         prev_epos.block = iinfo->i_location;
 699         prev_epos.bh = NULL;
 700         cur_epos = next_epos = prev_epos;
 701         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 702
 703         /* find the extent which contains the block we are looking for.
 704            alternate between laarr[0] and laarr[1] for locations of the
 705            current extent, and the previous extent */
 706         do {
 707                 if (prev_epos.bh != cur_epos.bh) {
 708                         brelse(prev_epos.bh);
 709                         get_bh(cur_epos.bh);
 710                         prev_epos.bh = cur_epos.bh;
 711                 }
 712                 if (cur_epos.bh != next_epos.bh) {
 713                         brelse(cur_epos.bh);
 714                         get_bh(next_epos.bh);
 715                         cur_epos.bh = next_epos.bh;
 716                 }
 717
 718                 lbcount += elen;
 719
 720                 prev_epos.block = cur_epos.block;
 721                 cur_epos.block = next_epos.block;
 722
 723                 prev_epos.offset = cur_epos.offset;
 724                 cur_epos.offset = next_epos.offset;
 725
 726                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 727                 if (etype == -1)
 728                         break;
 729
 730                 c = !c;
 731
 732                 laarr[c].extLength = (etype << 30) | elen;
 733                 laarr[c].extLocation = eloc;
 734
 735                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 736                         pgoal = eloc.logicalBlockNum +
 737                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 738                                  inode->i_sb->s_blocksize_bits);
 739
 740                 count++;
 741         } while (lbcount + elen <= b_off);
 742
 743         b_off -= lbcount;
 744         offset = b_off >> inode->i_sb->s_blocksize_bits;
 745         /*
 746          * Move prev_epos and cur_epos into indirect extent if we are at
 747          * the pointer to it
 748          */
 749         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 750         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 751
 752         /* if the extent is allocated and recorded, return the block
 753            if the extent is not a multiple of the blocksize, round up */
 754
 755         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 756                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 757                         elen = EXT_RECORDED_ALLOCATED |
 758                                 ((elen + inode->i_sb->s_blocksize - 1) &
 759                                  ~(inode->i_sb->s_blocksize - 1));
 760                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 761                 }
 762                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 763                 goto out_free;
 764         }
 765
 766         /* Are we beyond EOF and preallocated extent? */
 767         if (etype == -1) {
 768                 int ret;
 769                 loff_t hole_len;
 770
 771                 isBeyondEOF = true;
 772                 if (count) {
 773                         if (c)
 774                                 laarr[0] = laarr[1];
 775                         startnum = 1;
 776                 } else {
 777                         /* Create a fake extent when there's not one */
 778                         memset(&laarr[0].extLocation, 0x00,
 779                                 sizeof(struct kernel_lb_addr));
 780                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 781                         /* Will udf_do_extend_file() create real extent from
 782                            a fake one? */
 783                         startnum = (offset > 0);
 784                 }
 785                 /* Create extents for the hole between EOF and offset */
 786                 hole_len = (loff_t)offset << inode->i_blkbits;
 787                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 788                 if (ret < 0) {
 789                         *err = ret;
 790                         goto out_free;
 791                 }
 792                 c = 0;
 793                 offset = 0;
 794                 count += ret;
 795                 /* We are not covered by a preallocated extent? */
 796                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 797                                                 EXT_NOT_RECORDED_ALLOCATED) {
 798                         /* Is there any real extent? - otherwise we overwrite
 799                          * the fake one... */
 800                         if (count)
 801                                 c = !c;
 802                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 803                                 inode->i_sb->s_blocksize;
 804                         memset(&laarr[c].extLocation, 0x00,
 805                                 sizeof(struct kernel_lb_addr));
 806                         count++;
 807                 }
 808                 endnum = c + 1;
 809                 lastblock = 1;
 810         } else {
 811                 isBeyondEOF = false;
 812                 endnum = startnum = ((count > 2) ? 2 : count);
 813
 814                 /* if the current extent is in position 0,
 815                    swap it with the previous */
 816                 if (!c && count != 1) {
 817                         laarr[2] = laarr[0];
 818                         laarr[0] = laarr[1];
 819                         laarr[1] = laarr[2];
 820                         c = 1;
 821                 }
 822
 823                 /* if the current block is located in an extent,
 824                    read the next extent */
 825                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 826                 if (etype != -1) {
 827                         laarr[c + 1].extLength = (etype << 30) | elen;
 828                         laarr[c + 1].extLocation = eloc;
 829                         count++;
 830                         startnum++;
 831                         endnum++;
 832                 } else
 833                         lastblock = 1;
 834         }
 835
 836         /* if the current extent is not recorded but allocated, get the
 837          * block in the extent corresponding to the requested block */
 838         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 839                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 840         else { /* otherwise, allocate a new block */
 841                 if (iinfo->i_next_alloc_block == block)
 842                         goal = iinfo->i_next_alloc_goal;
 843
 844                 if (!goal) {
 845                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 846                                 goal = iinfo->i_location.logicalBlockNum + 1;
 847                 }
 848
 849                 newblocknum = udf_new_block(inode->i_sb, inode,
 850                                 iinfo->i_location.partitionReferenceNum,
 851                                 goal, err);
 852                 if (!newblocknum) {
 853                         *err = -ENOSPC;
 854                         goto out_free;
 855                 }
 856                 if (isBeyondEOF)
 857                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 858         }
 859
 860         /* if the extent the requsted block is located in contains multiple
 861          * blocks, split the extent into at most three extents. blocks prior
 862          * to requested block, requested block, and blocks after requested
 863          * block */
 864         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 865
 866         /* We preallocate blocks only for regular files. It also makes sense
 867          * for directories but there's a problem when to drop the
 868          * preallocation. We might use some delayed work for that but I feel
 869          * it's overengineering for a filesystem like UDF. */
 870         if (S_ISREG(inode->i_mode))
 871                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 872
 873         /* merge any continuous blocks in laarr */
 874         udf_merge_extents(inode, laarr, &endnum);
 875
 876         /* write back the new extents, inserting new extents if the new number
 877          * of extents is greater than the old number, and deleting extents if
 878          * the new number of extents is less than the old number */
 879         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 880
 881         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 882                                 iinfo->i_location.partitionReferenceNum, 0);
 883         if (!newblock) {
 884                 *err = -EIO;
 885                 goto out_free;
 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 out_free:
 897         brelse(prev_epos.bh);
 898         brelse(cur_epos.bh);
 899         brelse(next_epos.bh);
 900         return newblock;
 901 }
 902
 903 static void udf_split_extents(struct inode *inode, int *c, int offset,
 904                                udf_pblk_t newblocknum,
 905                                struct kernel_long_ad *laarr, int *endnum)
 906 {
 907         unsigned long blocksize = inode->i_sb->s_blocksize;
 908         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 909
 910         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 911             (laarr[*c].extLength >> 30) ==
 912                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 913                 int curr = *c;
 914                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 915                             blocksize - 1) >> blocksize_bits;
 916                 int8_t etype = (laarr[curr].extLength >> 30);
 917
 918                 if (blen == 1)
 919                         ;
 920                 else if (!offset || blen == offset + 1) {
 921                         laarr[curr + 2] = laarr[curr + 1];
 922                         laarr[curr + 1] = laarr[curr];
 923                 } else {
 924                         laarr[curr + 3] = laarr[curr + 1];
 925                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 926                 }
 927
 928                 if (offset) {
 929                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 930                                 udf_free_blocks(inode->i_sb, inode,
 931                                                 &laarr[curr].extLocation,
 932                                                 0, offset);
 933                                 laarr[curr].extLength =
 934                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 935                                         (offset << blocksize_bits);
 936                                 laarr[curr].extLocation.logicalBlockNum = 0;
 937                                 laarr[curr].extLocation.
 938                                                 partitionReferenceNum = 0;
 939                         } else
 940                                 laarr[curr].extLength = (etype << 30) |
 941                                         (offset << blocksize_bits);
 942                         curr++;
 943                         (*c)++;
 944                         (*endnum)++;
 945                 }
 946
 947                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 948                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 949                         laarr[curr].extLocation.partitionReferenceNum =
 950                                 UDF_I(inode)->i_location.partitionReferenceNum;
 951                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 952                         blocksize;
 953                 curr++;
 954
 955                 if (blen != offset + 1) {
 956                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 957                                 laarr[curr].extLocation.logicalBlockNum +=
 958                                                                 offset + 1;
 959                         laarr[curr].extLength = (etype << 30) |
 960                                 ((blen - (offset + 1)) << blocksize_bits);
 961                         curr++;
 962                         (*endnum)++;
 963                 }
 964         }
 965 }
 966
 967 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 968                                  struct kernel_long_ad *laarr,
 969                                  int *endnum)
 970 {
 971         int start, length = 0, currlength = 0, i;
 972
 973         if (*endnum >= (c + 1)) {
 974                 if (!lastblock)
 975                         return;
 976                 else
 977                         start = c;
 978         } else {
 979                 if ((laarr[c + 1].extLength >> 30) ==
 980                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 981                         start = c + 1;
 982                         length = currlength =
 983                                 (((laarr[c + 1].extLength &
 984                                         UDF_EXTENT_LENGTH_MASK) +
 985                                 inode->i_sb->s_blocksize - 1) >>
 986                                 inode->i_sb->s_blocksize_bits);
 987                 } else
 988                         start = c;
 989         }
 990
 991         for (i = start + 1; i <= *endnum; i++) {
 992                 if (i == *endnum) {
 993                         if (lastblock)
 994                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
 995                 } else if ((laarr[i].extLength >> 30) ==
 996                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 997                         length += (((laarr[i].extLength &
 998                                                 UDF_EXTENT_LENGTH_MASK) +
 999                                     inode->i_sb->s_blocksize - 1) >>
1000                                     inode->i_sb->s_blocksize_bits);
1001                 } else
1002                         break;
1003         }
1004
1005         if (length) {
1006                 int next = laarr[start].extLocation.logicalBlockNum +
1007                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1008                           inode->i_sb->s_blocksize - 1) >>
1009                           inode->i_sb->s_blocksize_bits);
1010                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1011                                 laarr[start].extLocation.partitionReferenceNum,
1012                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1013                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1014                                 currlength);
1015                 if (numalloc)   {
1016                         if (start == (c + 1))
1017                                 laarr[start].extLength +=
1018                                         (numalloc <<
1019                                          inode->i_sb->s_blocksize_bits);
1020                         else {
1021                                 memmove(&laarr[c + 2], &laarr[c + 1],
1022                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1023                                 (*endnum)++;
1024                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1025                                 laarr[c + 1].extLocation.partitionReferenceNum =
1026                                         laarr[c].extLocation.
1027                                                         partitionReferenceNum;
1028                                 laarr[c + 1].extLength =
1029                                         EXT_NOT_RECORDED_ALLOCATED |
1030                                         (numalloc <<
1031                                          inode->i_sb->s_blocksize_bits);
1032                                 start = c + 1;
1033                         }
1034
1035                         for (i = start + 1; numalloc && i < *endnum; i++) {
1036                                 int elen = ((laarr[i].extLength &
1037                                                 UDF_EXTENT_LENGTH_MASK) +
1038                                             inode->i_sb->s_blocksize - 1) >>
1039                                             inode->i_sb->s_blocksize_bits;
1040
1041                                 if (elen > numalloc) {
1042                                         laarr[i].extLength -=
1043                                                 (numalloc <<
1044                                                  inode->i_sb->s_blocksize_bits);
1045                                         numalloc = 0;
1046                                 } else {
1047                                         numalloc -= elen;
1048                                         if (*endnum > (i + 1))
1049                                                 memmove(&laarr[i],
1050                                                         &laarr[i + 1],
1051                                                         sizeof(struct long_ad) *
1052                                                         (*endnum - (i + 1)));
1053                                         i--;
1054                                         (*endnum)--;
1055                                 }
1056                         }
1057                         UDF_I(inode)->i_lenExtents +=
1058                                 numalloc << inode->i_sb->s_blocksize_bits;
1059                 }
1060         }
1061 }
1062
1063 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1064                               int *endnum)
1065 {
1066         int i;
1067         unsigned long blocksize = inode->i_sb->s_blocksize;
1068         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1069
1070         for (i = 0; i < (*endnum - 1); i++) {
1071                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1072                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1073
1074                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1075                         (((li->extLength >> 30) ==
1076                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1077                         ((lip1->extLocation.logicalBlockNum -
1078                           li->extLocation.logicalBlockNum) ==
1079                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1080                         blocksize - 1) >> blocksize_bits)))) {
1081
1082                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1083                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1084                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1085                                 lip1->extLength = (lip1->extLength -
1086                                                   (li->extLength &
1087                                                    UDF_EXTENT_LENGTH_MASK) +
1088                                                    UDF_EXTENT_LENGTH_MASK) &
1089                                                         ~(blocksize - 1);
1090                                 li->extLength = (li->extLength &
1091                                                  UDF_EXTENT_FLAG_MASK) +
1092                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1093                                                 blocksize;
1094                                 lip1->extLocation.logicalBlockNum =
1095                                         li->extLocation.logicalBlockNum +
1096                                         ((li->extLength &
1097                                                 UDF_EXTENT_LENGTH_MASK) >>
1098                                                 blocksize_bits);
1099                         } else {
1100                                 li->extLength = lip1->extLength +
1101                                         (((li->extLength &
1102                                                 UDF_EXTENT_LENGTH_MASK) +
1103                                          blocksize - 1) & ~(blocksize - 1));
1104                                 if (*endnum > (i + 2))
1105                                         memmove(&laarr[i + 1], &laarr[i + 2],
1106                                                 sizeof(struct long_ad) *
1107                                                 (*endnum - (i + 2)));
1108                                 i--;
1109                                 (*endnum)--;
1110                         }
1111                 } else if (((li->extLength >> 30) ==
1112                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1113                            ((lip1->extLength >> 30) ==
1114                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1115                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1116                                         ((li->extLength &
1117                                           UDF_EXTENT_LENGTH_MASK) +
1118                                          blocksize - 1) >> blocksize_bits);
1119                         li->extLocation.logicalBlockNum = 0;
1120                         li->extLocation.partitionReferenceNum = 0;
1121
1122                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1123                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1124                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1125                                 lip1->extLength = (lip1->extLength -
1126                                                    (li->extLength &
1127                                                    UDF_EXTENT_LENGTH_MASK) +
1128                                                    UDF_EXTENT_LENGTH_MASK) &
1129                                                    ~(blocksize - 1);
1130                                 li->extLength = (li->extLength &
1131                                                  UDF_EXTENT_FLAG_MASK) +
1132                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1133                                                 blocksize;
1134                         } else {
1135                                 li->extLength = lip1->extLength +
1136                                         (((li->extLength &
1137                                                 UDF_EXTENT_LENGTH_MASK) +
1138                                           blocksize - 1) & ~(blocksize - 1));
1139                                 if (*endnum > (i + 2))
1140                                         memmove(&laarr[i + 1], &laarr[i + 2],
1141                                                 sizeof(struct long_ad) *
1142                                                 (*endnum - (i + 2)));
1143                                 i--;
1144                                 (*endnum)--;
1145                         }
1146                 } else if ((li->extLength >> 30) ==
1147                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1148                         udf_free_blocks(inode->i_sb, inode,
1149                                         &li->extLocation, 0,
1150                                         ((li->extLength &
1151                                                 UDF_EXTENT_LENGTH_MASK) +
1152                                          blocksize - 1) >> blocksize_bits);
1153                         li->extLocation.logicalBlockNum = 0;
1154                         li->extLocation.partitionReferenceNum = 0;
1155                         li->extLength = (li->extLength &
1156                                                 UDF_EXTENT_LENGTH_MASK) |
1157                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1158                 }
1159         }
1160 }
1161
1162 static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
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);
1173         } else if (startnum < endnum) {
1174                 for (i = 0; i < (endnum - startnum); i++) {
1175                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1176                                         laarr[i].extLength);
1177                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1178                                       &laarr[i].extLength, 1);
1179                         start++;
1180                 }
1181         }
1182
1183         for (i = start; i < endnum; i++) {
1184                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1185                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1186                                laarr[i].extLength, 1);
1187         }
1188 }
1189
1190 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1191                               int create, int *err)
1192 {
1193         struct buffer_head *bh = NULL;
1194
1195         bh = udf_getblk(inode, block, create, err);
1196         if (!bh)
1197                 return NULL;
1198
1199         if (bh_read(bh, 0) >= 0)
1200                 return bh;
1201
1202         brelse(bh);
1203         *err = -EIO;
1204         return NULL;
1205 }
1206
1207 int udf_setsize(struct inode *inode, loff_t newsize)
1208 {
1209         int err;
1210         struct udf_inode_info *iinfo;
1211         unsigned int bsize = i_blocksize(inode);
1212
1213         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1214               S_ISLNK(inode->i_mode)))
1215                 return -EINVAL;
1216         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1217                 return -EPERM;
1218
1219         iinfo = UDF_I(inode);
1220         if (newsize > inode->i_size) {
1221                 down_write(&iinfo->i_data_sem);
1222                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1223                         if (bsize <
1224                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1225                                 err = udf_expand_file_adinicb(inode);
1226                                 if (err)
1227                                         return err;
1228                                 down_write(&iinfo->i_data_sem);
1229                         } else {
1230                                 iinfo->i_lenAlloc = newsize;
1231                                 goto set_size;
1232                         }
1233                 }
1234                 err = udf_extend_file(inode, newsize);
1235                 if (err) {
1236                         up_write(&iinfo->i_data_sem);
1237                         return err;
1238                 }
1239 set_size:
1240                 up_write(&iinfo->i_data_sem);
1241                 truncate_setsize(inode, newsize);
1242         } else {
1243                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1244                         down_write(&iinfo->i_data_sem);
1245                         udf_clear_extent_cache(inode);
1246                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1247                                0x00, bsize - newsize -
1248                                udf_file_entry_alloc_offset(inode));
1249                         iinfo->i_lenAlloc = newsize;
1250                         truncate_setsize(inode, newsize);
1251                         up_write(&iinfo->i_data_sem);
1252                         goto update_time;
1253                 }
1254                 err = block_truncate_page(inode->i_mapping, newsize,
1255                                           udf_get_block);
1256                 if (err)
1257                         return err;
1258                 truncate_setsize(inode, newsize);
1259                 down_write(&iinfo->i_data_sem);
1260                 udf_clear_extent_cache(inode);
1261                 err = udf_truncate_extents(inode);
1262                 up_write(&iinfo->i_data_sem);
1263                 if (err)
1264                         return err;
1265         }
1266 update_time:
1267         inode->i_mtime = inode->i_ctime = current_time(inode);
1268         if (IS_SYNC(inode))
1269                 udf_sync_inode(inode);
1270         else
1271                 mark_inode_dirty(inode);
1272         return 0;
1273 }
1274
1275 /*
1276  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1277  * arbitrary - just that we hopefully don't limit any real use of rewritten
1278  * inode on write-once media but avoid looping for too long on corrupted media.
1279  */
1280 #define UDF_MAX_ICB_NESTING 1024
1281
1282 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1283 {
1284         struct buffer_head *bh = NULL;
1285         struct fileEntry *fe;
1286         struct extendedFileEntry *efe;
1287         uint16_t ident;
1288         struct udf_inode_info *iinfo = UDF_I(inode);
1289         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1290         struct kernel_lb_addr *iloc = &iinfo->i_location;
1291         unsigned int link_count;
1292         unsigned int indirections = 0;
1293         int bs = inode->i_sb->s_blocksize;
1294         int ret = -EIO;
1295         uint32_t uid, gid;
1296
1297 reread:
1298         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1299                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1300                           iloc->partitionReferenceNum, sbi->s_partitions);
1301                 return -EIO;
1302         }
1303
1304         if (iloc->logicalBlockNum >=
1305             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1306                 udf_debug("block=%u, partition=%u out of range\n",
1307                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1308                 return -EIO;
1309         }
1310
1311         /*
1312          * Set defaults, but the inode is still incomplete!
1313          * Note: get_new_inode() sets the following on a new inode:
1314          *      i_sb = sb
1315          *      i_no = ino
1316          *      i_flags = sb->s_flags
1317          *      i_state = 0
1318          * clean_inode(): zero fills and sets
1319          *      i_count = 1
1320          *      i_nlink = 1
1321          *      i_op = NULL;
1322          */
1323         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1324         if (!bh) {
1325                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1326                 return -EIO;
1327         }
1328
1329         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1330             ident != TAG_IDENT_USE) {
1331                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1332                         inode->i_ino, ident);
1333                 goto out;
1334         }
1335
1336         fe = (struct fileEntry *)bh->b_data;
1337         efe = (struct extendedFileEntry *)bh->b_data;
1338
1339         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1340                 struct buffer_head *ibh;
1341
1342                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1343                 if (ident == TAG_IDENT_IE && ibh) {
1344                         struct kernel_lb_addr loc;
1345                         struct indirectEntry *ie;
1346
1347                         ie = (struct indirectEntry *)ibh->b_data;
1348                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1349
1350                         if (ie->indirectICB.extLength) {
1351                                 brelse(ibh);
1352                                 memcpy(&iinfo->i_location, &loc,
1353                                        sizeof(struct kernel_lb_addr));
1354                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1355                                         udf_err(inode->i_sb,
1356                                                 "too many ICBs in ICB hierarchy"
1357                                                 " (max %d supported)\n",
1358                                                 UDF_MAX_ICB_NESTING);
1359                                         goto out;
1360                                 }
1361                                 brelse(bh);
1362                                 goto reread;
1363                         }
1364                 }
1365                 brelse(ibh);
1366         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1367                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1368                         le16_to_cpu(fe->icbTag.strategyType));
1369                 goto out;
1370         }
1371         if (fe->icbTag.strategyType == cpu_to_le16(4))
1372                 iinfo->i_strat4096 = 0;
1373         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1374                 iinfo->i_strat4096 = 1;
1375
1376         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1377                                                         ICBTAG_FLAG_AD_MASK;
1378         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1379             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1380             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1381                 ret = -EIO;
1382                 goto out;
1383         }
1384         iinfo->i_unique = 0;
1385         iinfo->i_lenEAttr = 0;
1386         iinfo->i_lenExtents = 0;
1387         iinfo->i_lenAlloc = 0;
1388         iinfo->i_next_alloc_block = 0;
1389         iinfo->i_next_alloc_goal = 0;
1390         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1391                 iinfo->i_efe = 1;
1392                 iinfo->i_use = 0;
1393                 ret = udf_alloc_i_data(inode, bs -
1394                                         sizeof(struct extendedFileEntry));
1395                 if (ret)
1396                         goto out;
1397                 memcpy(iinfo->i_data,
1398                        bh->b_data + sizeof(struct extendedFileEntry),
1399                        bs - sizeof(struct extendedFileEntry));
1400         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1401                 iinfo->i_efe = 0;
1402                 iinfo->i_use = 0;
1403                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1404                 if (ret)
1405                         goto out;
1406                 memcpy(iinfo->i_data,
1407                        bh->b_data + sizeof(struct fileEntry),
1408                        bs - sizeof(struct fileEntry));
1409         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1410                 iinfo->i_efe = 0;
1411                 iinfo->i_use = 1;
1412                 iinfo->i_lenAlloc = le32_to_cpu(
1413                                 ((struct unallocSpaceEntry *)bh->b_data)->
1414                                  lengthAllocDescs);
1415                 ret = udf_alloc_i_data(inode, bs -
1416                                         sizeof(struct unallocSpaceEntry));
1417                 if (ret)
1418                         goto out;
1419                 memcpy(iinfo->i_data,
1420                        bh->b_data + sizeof(struct unallocSpaceEntry),
1421                        bs - sizeof(struct unallocSpaceEntry));
1422                 return 0;
1423         }
1424
1425         ret = -EIO;
1426         read_lock(&sbi->s_cred_lock);
1427         uid = le32_to_cpu(fe->uid);
1428         if (uid == UDF_INVALID_ID ||
1429             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1430                 inode->i_uid = sbi->s_uid;
1431         else
1432                 i_uid_write(inode, uid);
1433
1434         gid = le32_to_cpu(fe->gid);
1435         if (gid == UDF_INVALID_ID ||
1436             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1437                 inode->i_gid = sbi->s_gid;
1438         else
1439                 i_gid_write(inode, gid);
1440
1441         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1442                         sbi->s_fmode != UDF_INVALID_MODE)
1443                 inode->i_mode = sbi->s_fmode;
1444         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1445                         sbi->s_dmode != UDF_INVALID_MODE)
1446                 inode->i_mode = sbi->s_dmode;
1447         else
1448                 inode->i_mode = udf_convert_permissions(fe);
1449         inode->i_mode &= ~sbi->s_umask;
1450         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1451
1452         read_unlock(&sbi->s_cred_lock);
1453
1454         link_count = le16_to_cpu(fe->fileLinkCount);
1455         if (!link_count) {
1456                 if (!hidden_inode) {
1457                         ret = -ESTALE;
1458                         goto out;
1459                 }
1460                 link_count = 1;
1461         }
1462         set_nlink(inode, link_count);
1463
1464         inode->i_size = le64_to_cpu(fe->informationLength);
1465         iinfo->i_lenExtents = inode->i_size;
1466
1467         if (iinfo->i_efe == 0) {
1468                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1469                         (inode->i_sb->s_blocksize_bits - 9);
1470
1471                 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1472                 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1473                 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1474
1475                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1476                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1477                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1478                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1479                 iinfo->i_streamdir = 0;
1480                 iinfo->i_lenStreams = 0;
1481         } else {
1482                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1483                     (inode->i_sb->s_blocksize_bits - 9);
1484
1485                 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1486                 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1487                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1488                 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
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                 /* Named streams */
1496                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1497                 iinfo->i_locStreamdir =
1498                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1499                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1500                 if (iinfo->i_lenStreams >= inode->i_size)
1501                         iinfo->i_lenStreams -= inode->i_size;
1502                 else
1503                         iinfo->i_lenStreams = 0;
1504         }
1505         inode->i_generation = iinfo->i_unique;
1506
1507         /*
1508          * Sanity check length of allocation descriptors and extended attrs to
1509          * avoid integer overflows
1510          */
1511         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1512                 goto out;
1513         /* Now do exact checks */
1514         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1515                 goto out;
1516         /* Sanity checks for files in ICB so that we don't get confused later */
1517         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1518                 /*
1519                  * For file in ICB data is stored in allocation descriptor
1520                  * so sizes should match
1521                  */
1522                 if (iinfo->i_lenAlloc != inode->i_size)
1523                         goto out;
1524                 /* File in ICB has to fit in there... */
1525                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1526                         goto out;
1527         }
1528
1529         switch (fe->icbTag.fileType) {
1530         case ICBTAG_FILE_TYPE_DIRECTORY:
1531                 inode->i_op = &udf_dir_inode_operations;
1532                 inode->i_fop = &udf_dir_operations;
1533                 inode->i_mode |= S_IFDIR;
1534                 inc_nlink(inode);
1535                 break;
1536         case ICBTAG_FILE_TYPE_REALTIME:
1537         case ICBTAG_FILE_TYPE_REGULAR:
1538         case ICBTAG_FILE_TYPE_UNDEF:
1539         case ICBTAG_FILE_TYPE_VAT20:
1540                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1541                         inode->i_data.a_ops = &udf_adinicb_aops;
1542                 else
1543                         inode->i_data.a_ops = &udf_aops;
1544                 inode->i_op = &udf_file_inode_operations;
1545                 inode->i_fop = &udf_file_operations;
1546                 inode->i_mode |= S_IFREG;
1547                 break;
1548         case ICBTAG_FILE_TYPE_BLOCK:
1549                 inode->i_mode |= S_IFBLK;
1550                 break;
1551         case ICBTAG_FILE_TYPE_CHAR:
1552                 inode->i_mode |= S_IFCHR;
1553                 break;
1554         case ICBTAG_FILE_TYPE_FIFO:
1555                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1556                 break;
1557         case ICBTAG_FILE_TYPE_SOCKET:
1558                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1559                 break;
1560         case ICBTAG_FILE_TYPE_SYMLINK:
1561                 inode->i_data.a_ops = &udf_symlink_aops;
1562                 inode->i_op = &udf_symlink_inode_operations;
1563                 inode_nohighmem(inode);
1564                 inode->i_mode = S_IFLNK | 0777;
1565                 break;
1566         case ICBTAG_FILE_TYPE_MAIN:
1567                 udf_debug("METADATA FILE-----\n");
1568                 break;
1569         case ICBTAG_FILE_TYPE_MIRROR:
1570                 udf_debug("METADATA MIRROR FILE-----\n");
1571                 break;
1572         case ICBTAG_FILE_TYPE_BITMAP:
1573                 udf_debug("METADATA BITMAP FILE-----\n");
1574                 break;
1575         default:
1576                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1577                         inode->i_ino, fe->icbTag.fileType);
1578                 goto out;
1579         }
1580         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1581                 struct deviceSpec *dsea =
1582                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1583                 if (dsea) {
1584                         init_special_inode(inode, inode->i_mode,
1585                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1586                                       le32_to_cpu(dsea->minorDeviceIdent)));
1587                         /* Developer ID ??? */
1588                 } else
1589                         goto out;
1590         }
1591         ret = 0;
1592 out:
1593         brelse(bh);
1594         return ret;
1595 }
1596
1597 static int udf_alloc_i_data(struct inode *inode, size_t size)
1598 {
1599         struct udf_inode_info *iinfo = UDF_I(inode);
1600         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1601         if (!iinfo->i_data)
1602                 return -ENOMEM;
1603         return 0;
1604 }
1605
1606 static umode_t udf_convert_permissions(struct fileEntry *fe)
1607 {
1608         umode_t mode;
1609         uint32_t permissions;
1610         uint32_t flags;
1611
1612         permissions = le32_to_cpu(fe->permissions);
1613         flags = le16_to_cpu(fe->icbTag.flags);
1614
1615         mode =  ((permissions) & 0007) |
1616                 ((permissions >> 2) & 0070) |
1617                 ((permissions >> 4) & 0700) |
1618                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1619                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1620                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1621
1622         return mode;
1623 }
1624
1625 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1626 {
1627         struct udf_inode_info *iinfo = UDF_I(inode);
1628
1629         /*
1630          * UDF 2.01 sec. 3.3.3.3 Note 2:
1631          * In Unix, delete permission tracks write
1632          */
1633         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1634         if (mode & 0200)
1635                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1636         if (mode & 0020)
1637                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1638         if (mode & 0002)
1639                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1640 }
1641
1642 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1643 {
1644         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1645 }
1646
1647 static int udf_sync_inode(struct inode *inode)
1648 {
1649         return udf_update_inode(inode, 1);
1650 }
1651
1652 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1653 {
1654         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1655             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1656              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1657                 iinfo->i_crtime = time;
1658 }
1659
1660 static int udf_update_inode(struct inode *inode, int do_sync)
1661 {
1662         struct buffer_head *bh = NULL;
1663         struct fileEntry *fe;
1664         struct extendedFileEntry *efe;
1665         uint64_t lb_recorded;
1666         uint32_t udfperms;
1667         uint16_t icbflags;
1668         uint16_t crclen;
1669         int err = 0;
1670         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1671         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1672         struct udf_inode_info *iinfo = UDF_I(inode);
1673
1674         bh = udf_tgetblk(inode->i_sb,
1675                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1676         if (!bh) {
1677                 udf_debug("getblk failure\n");
1678                 return -EIO;
1679         }
1680
1681         lock_buffer(bh);
1682         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1683         fe = (struct fileEntry *)bh->b_data;
1684         efe = (struct extendedFileEntry *)bh->b_data;
1685
1686         if (iinfo->i_use) {
1687                 struct unallocSpaceEntry *use =
1688                         (struct unallocSpaceEntry *)bh->b_data;
1689
1690                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1691                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1692                        iinfo->i_data, inode->i_sb->s_blocksize -
1693                                         sizeof(struct unallocSpaceEntry));
1694                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1695                 crclen = sizeof(struct unallocSpaceEntry);
1696
1697                 goto finish;
1698         }
1699
1700         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1701                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1702         else
1703                 fe->uid = cpu_to_le32(i_uid_read(inode));
1704
1705         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1706                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1707         else
1708                 fe->gid = cpu_to_le32(i_gid_read(inode));
1709
1710         udfperms = ((inode->i_mode & 0007)) |
1711                    ((inode->i_mode & 0070) << 2) |
1712                    ((inode->i_mode & 0700) << 4);
1713
1714         udfperms |= iinfo->i_extraPerms;
1715         fe->permissions = cpu_to_le32(udfperms);
1716
1717         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1718                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1719         else
1720                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1721
1722         fe->informationLength = cpu_to_le64(inode->i_size);
1723
1724         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1725                 struct regid *eid;
1726                 struct deviceSpec *dsea =
1727                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1728                 if (!dsea) {
1729                         dsea = (struct deviceSpec *)
1730                                 udf_add_extendedattr(inode,
1731                                                      sizeof(struct deviceSpec) +
1732                                                      sizeof(struct regid), 12, 0x3);
1733                         dsea->attrType = cpu_to_le32(12);
1734                         dsea->attrSubtype = 1;
1735                         dsea->attrLength = cpu_to_le32(
1736                                                 sizeof(struct deviceSpec) +
1737                                                 sizeof(struct regid));
1738                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1739                 }
1740                 eid = (struct regid *)dsea->impUse;
1741                 memset(eid, 0, sizeof(*eid));
1742                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1743                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1744                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1745                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1746                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1747         }
1748
1749         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1750                 lb_recorded = 0; /* No extents => no blocks! */
1751         else
1752                 lb_recorded =
1753                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1754                         (blocksize_bits - 9);
1755
1756         if (iinfo->i_efe == 0) {
1757                 memcpy(bh->b_data + sizeof(struct fileEntry),
1758                        iinfo->i_data,
1759                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1760                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1761
1762                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1763                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1764                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1765                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1766                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1767                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1768                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1769                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1770                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1771                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1772                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1773                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1774                 crclen = sizeof(struct fileEntry);
1775         } else {
1776                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1777                        iinfo->i_data,
1778                        inode->i_sb->s_blocksize -
1779                                         sizeof(struct extendedFileEntry));
1780                 efe->objectSize =
1781                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1782                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1783
1784                 if (iinfo->i_streamdir) {
1785                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1786
1787                         icb_lad->extLocation =
1788                                 cpu_to_lelb(iinfo->i_locStreamdir);
1789                         icb_lad->extLength =
1790                                 cpu_to_le32(inode->i_sb->s_blocksize);
1791                 }
1792
1793                 udf_adjust_time(iinfo, inode->i_atime);
1794                 udf_adjust_time(iinfo, inode->i_mtime);
1795                 udf_adjust_time(iinfo, inode->i_ctime);
1796
1797                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1798                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1799                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1800                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1801
1802                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1803                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1804                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1805                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1806                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1807                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1808                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1809                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1810                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1811                 crclen = sizeof(struct extendedFileEntry);
1812         }
1813
1814 finish:
1815         if (iinfo->i_strat4096) {
1816                 fe->icbTag.strategyType = cpu_to_le16(4096);
1817                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1818                 fe->icbTag.numEntries = cpu_to_le16(2);
1819         } else {
1820                 fe->icbTag.strategyType = cpu_to_le16(4);
1821                 fe->icbTag.numEntries = cpu_to_le16(1);
1822         }
1823
1824         if (iinfo->i_use)
1825                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1826         else if (S_ISDIR(inode->i_mode))
1827                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1828         else if (S_ISREG(inode->i_mode))
1829                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1830         else if (S_ISLNK(inode->i_mode))
1831                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1832         else if (S_ISBLK(inode->i_mode))
1833                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1834         else if (S_ISCHR(inode->i_mode))
1835                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1836         else if (S_ISFIFO(inode->i_mode))
1837                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1838         else if (S_ISSOCK(inode->i_mode))
1839                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1840
1841         icbflags =      iinfo->i_alloc_type |
1842                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1843                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1844                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1845                         (le16_to_cpu(fe->icbTag.flags) &
1846                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1847                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1848
1849         fe->icbTag.flags = cpu_to_le16(icbflags);
1850         if (sbi->s_udfrev >= 0x0200)
1851                 fe->descTag.descVersion = cpu_to_le16(3);
1852         else
1853                 fe->descTag.descVersion = cpu_to_le16(2);
1854         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1855         fe->descTag.tagLocation = cpu_to_le32(
1856                                         iinfo->i_location.logicalBlockNum);
1857         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1858         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1859         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1860                                                   crclen));
1861         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1862
1863         set_buffer_uptodate(bh);
1864         unlock_buffer(bh);
1865
1866         /* write the data blocks */
1867         mark_buffer_dirty(bh);
1868         if (do_sync) {
1869                 sync_dirty_buffer(bh);
1870                 if (buffer_write_io_error(bh)) {
1871                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1872                                  inode->i_ino);
1873                         err = -EIO;
1874                 }
1875         }
1876         brelse(bh);
1877
1878         return err;
1879 }
1880
1881 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1882                          bool hidden_inode)
1883 {
1884         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1885         struct inode *inode = iget_locked(sb, block);
1886         int err;
1887
1888         if (!inode)
1889                 return ERR_PTR(-ENOMEM);
1890
1891         if (!(inode->i_state & I_NEW))
1892                 return inode;
1893
1894         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1895         err = udf_read_inode(inode, hidden_inode);
1896         if (err < 0) {
1897                 iget_failed(inode);
1898                 return ERR_PTR(err);
1899         }
1900         unlock_new_inode(inode);
1901
1902         return inode;
1903 }
1904
1905 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1906                             struct extent_position *epos)
1907 {
1908         struct super_block *sb = inode->i_sb;
1909         struct buffer_head *bh;
1910         struct allocExtDesc *aed;
1911         struct extent_position nepos;
1912         struct kernel_lb_addr neloc;
1913         int ver, adsize;
1914
1915         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1916                 adsize = sizeof(struct short_ad);
1917         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1918                 adsize = sizeof(struct long_ad);
1919         else
1920                 return -EIO;
1921
1922         neloc.logicalBlockNum = block;
1923         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1924
1925         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1926         if (!bh)
1927                 return -EIO;
1928         lock_buffer(bh);
1929         memset(bh->b_data, 0x00, sb->s_blocksize);
1930         set_buffer_uptodate(bh);
1931         unlock_buffer(bh);
1932         mark_buffer_dirty_inode(bh, inode);
1933
1934         aed = (struct allocExtDesc *)(bh->b_data);
1935         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1936                 aed->previousAllocExtLocation =
1937                                 cpu_to_le32(epos->block.logicalBlockNum);
1938         }
1939         aed->lengthAllocDescs = cpu_to_le32(0);
1940         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1941                 ver = 3;
1942         else
1943                 ver = 2;
1944         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1945                     sizeof(struct tag));
1946
1947         nepos.block = neloc;
1948         nepos.offset = sizeof(struct allocExtDesc);
1949         nepos.bh = bh;
1950
1951         /*
1952          * Do we have to copy current last extent to make space for indirect
1953          * one?
1954          */
1955         if (epos->offset + adsize > sb->s_blocksize) {
1956                 struct kernel_lb_addr cp_loc;
1957                 uint32_t cp_len;
1958                 int cp_type;
1959
1960                 epos->offset -= adsize;
1961                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1962                 cp_len |= ((uint32_t)cp_type) << 30;
1963
1964                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1965                 udf_write_aext(inode, epos, &nepos.block,
1966                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
1967         } else {
1968                 __udf_add_aext(inode, epos, &nepos.block,
1969                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
1970         }
1971
1972         brelse(epos->bh);
1973         *epos = nepos;
1974
1975         return 0;
1976 }
1977
1978 /*
1979  * Append extent at the given position - should be the first free one in inode
1980  * / indirect extent. This function assumes there is enough space in the inode
1981  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1982  */
1983 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1984                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1985 {
1986         struct udf_inode_info *iinfo = UDF_I(inode);
1987         struct allocExtDesc *aed;
1988         int adsize;
1989
1990         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1991                 adsize = sizeof(struct short_ad);
1992         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1993                 adsize = sizeof(struct long_ad);
1994         else
1995                 return -EIO;
1996
1997         if (!epos->bh) {
1998                 WARN_ON(iinfo->i_lenAlloc !=
1999                         epos->offset - udf_file_entry_alloc_offset(inode));
2000         } else {
2001                 aed = (struct allocExtDesc *)epos->bh->b_data;
2002                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2003                         epos->offset - sizeof(struct allocExtDesc));
2004                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2005         }
2006
2007         udf_write_aext(inode, epos, eloc, elen, inc);
2008
2009         if (!epos->bh) {
2010                 iinfo->i_lenAlloc += adsize;
2011                 mark_inode_dirty(inode);
2012         } else {
2013                 aed = (struct allocExtDesc *)epos->bh->b_data;
2014                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2015                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2016                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2017                         udf_update_tag(epos->bh->b_data,
2018                                         epos->offset + (inc ? 0 : adsize));
2019                 else
2020                         udf_update_tag(epos->bh->b_data,
2021                                         sizeof(struct allocExtDesc));
2022                 mark_buffer_dirty_inode(epos->bh, inode);
2023         }
2024
2025         return 0;
2026 }
2027
2028 /*
2029  * Append extent at given position - should be the first free one in inode
2030  * / indirect extent. Takes care of allocating and linking indirect blocks.
2031  */
2032 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2033                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2034 {
2035         int adsize;
2036         struct super_block *sb = inode->i_sb;
2037
2038         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2039                 adsize = sizeof(struct short_ad);
2040         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2041                 adsize = sizeof(struct long_ad);
2042         else
2043                 return -EIO;
2044
2045         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2046                 int err;
2047                 udf_pblk_t new_block;
2048
2049                 new_block = udf_new_block(sb, NULL,
2050                                           epos->block.partitionReferenceNum,
2051                                           epos->block.logicalBlockNum, &err);
2052                 if (!new_block)
2053                         return -ENOSPC;
2054
2055                 err = udf_setup_indirect_aext(inode, new_block, epos);
2056                 if (err)
2057                         return err;
2058         }
2059
2060         return __udf_add_aext(inode, epos, eloc, elen, inc);
2061 }
2062
2063 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2064                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2065 {
2066         int adsize;
2067         uint8_t *ptr;
2068         struct short_ad *sad;
2069         struct long_ad *lad;
2070         struct udf_inode_info *iinfo = UDF_I(inode);
2071
2072         if (!epos->bh)
2073                 ptr = iinfo->i_data + epos->offset -
2074                         udf_file_entry_alloc_offset(inode) +
2075                         iinfo->i_lenEAttr;
2076         else
2077                 ptr = epos->bh->b_data + epos->offset;
2078
2079         switch (iinfo->i_alloc_type) {
2080         case ICBTAG_FLAG_AD_SHORT:
2081                 sad = (struct short_ad *)ptr;
2082                 sad->extLength = cpu_to_le32(elen);
2083                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2084                 adsize = sizeof(struct short_ad);
2085                 break;
2086         case ICBTAG_FLAG_AD_LONG:
2087                 lad = (struct long_ad *)ptr;
2088                 lad->extLength = cpu_to_le32(elen);
2089                 lad->extLocation = cpu_to_lelb(*eloc);
2090                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2091                 adsize = sizeof(struct long_ad);
2092                 break;
2093         default:
2094                 return;
2095         }
2096
2097         if (epos->bh) {
2098                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2099                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2100                         struct allocExtDesc *aed =
2101                                 (struct allocExtDesc *)epos->bh->b_data;
2102                         udf_update_tag(epos->bh->b_data,
2103                                        le32_to_cpu(aed->lengthAllocDescs) +
2104                                        sizeof(struct allocExtDesc));
2105                 }
2106                 mark_buffer_dirty_inode(epos->bh, inode);
2107         } else {
2108                 mark_inode_dirty(inode);
2109         }
2110
2111         if (inc)
2112                 epos->offset += adsize;
2113 }
2114
2115 /*
2116  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2117  * someone does some weird stuff.
2118  */
2119 #define UDF_MAX_INDIR_EXTS 16
2120
2121 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2122                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2123 {
2124         int8_t etype;
2125         unsigned int indirections = 0;
2126
2127         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2128                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2129                 udf_pblk_t block;
2130
2131                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2132                         udf_err(inode->i_sb,
2133                                 "too many indirect extents in inode %lu\n",
2134                                 inode->i_ino);
2135                         return -1;
2136                 }
2137
2138                 epos->block = *eloc;
2139                 epos->offset = sizeof(struct allocExtDesc);
2140                 brelse(epos->bh);
2141                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2142                 epos->bh = udf_tread(inode->i_sb, block);
2143                 if (!epos->bh) {
2144                         udf_debug("reading block %u failed!\n", block);
2145                         return -1;
2146                 }
2147         }
2148
2149         return etype;
2150 }
2151
2152 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2153                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2154 {
2155         int alen;
2156         int8_t etype;
2157         uint8_t *ptr;
2158         struct short_ad *sad;
2159         struct long_ad *lad;
2160         struct udf_inode_info *iinfo = UDF_I(inode);
2161
2162         if (!epos->bh) {
2163                 if (!epos->offset)
2164                         epos->offset = udf_file_entry_alloc_offset(inode);
2165                 ptr = iinfo->i_data + epos->offset -
2166                         udf_file_entry_alloc_offset(inode) +
2167                         iinfo->i_lenEAttr;
2168                 alen = udf_file_entry_alloc_offset(inode) +
2169                                                         iinfo->i_lenAlloc;
2170         } else {
2171                 if (!epos->offset)
2172                         epos->offset = sizeof(struct allocExtDesc);
2173                 ptr = epos->bh->b_data + epos->offset;
2174                 alen = sizeof(struct allocExtDesc) +
2175                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2176                                                         lengthAllocDescs);
2177         }
2178
2179         switch (iinfo->i_alloc_type) {
2180         case ICBTAG_FLAG_AD_SHORT:
2181                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2182                 if (!sad)
2183                         return -1;
2184                 etype = le32_to_cpu(sad->extLength) >> 30;
2185                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2186                 eloc->partitionReferenceNum =
2187                                 iinfo->i_location.partitionReferenceNum;
2188                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2189                 break;
2190         case ICBTAG_FLAG_AD_LONG:
2191                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2192                 if (!lad)
2193                         return -1;
2194                 etype = le32_to_cpu(lad->extLength) >> 30;
2195                 *eloc = lelb_to_cpu(lad->extLocation);
2196                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2197                 break;
2198         default:
2199                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2200                 return -1;
2201         }
2202
2203         return etype;
2204 }
2205
2206 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2207                               struct kernel_lb_addr neloc, uint32_t nelen)
2208 {
2209         struct kernel_lb_addr oeloc;
2210         uint32_t oelen;
2211         int8_t etype;
2212
2213         if (epos.bh)
2214                 get_bh(epos.bh);
2215
2216         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2217                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2218                 neloc = oeloc;
2219                 nelen = (etype << 30) | oelen;
2220         }
2221         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2222         brelse(epos.bh);
2223
2224         return (nelen >> 30);
2225 }
2226
2227 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2228 {
2229         struct extent_position oepos;
2230         int adsize;
2231         int8_t etype;
2232         struct allocExtDesc *aed;
2233         struct udf_inode_info *iinfo;
2234         struct kernel_lb_addr eloc;
2235         uint32_t elen;
2236
2237         if (epos.bh) {
2238                 get_bh(epos.bh);
2239                 get_bh(epos.bh);
2240         }
2241
2242         iinfo = UDF_I(inode);
2243         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2244                 adsize = sizeof(struct short_ad);
2245         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2246                 adsize = sizeof(struct long_ad);
2247         else
2248                 adsize = 0;
2249
2250         oepos = epos;
2251         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2252                 return -1;
2253
2254         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2255                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2256                 if (oepos.bh != epos.bh) {
2257                         oepos.block = epos.block;
2258                         brelse(oepos.bh);
2259                         get_bh(epos.bh);
2260                         oepos.bh = epos.bh;
2261                         oepos.offset = epos.offset - adsize;
2262                 }
2263         }
2264         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2265         elen = 0;
2266
2267         if (epos.bh != oepos.bh) {
2268                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2269                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2270                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2271                 if (!oepos.bh) {
2272                         iinfo->i_lenAlloc -= (adsize * 2);
2273                         mark_inode_dirty(inode);
2274                 } else {
2275                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2276                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2277                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2278                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2279                                 udf_update_tag(oepos.bh->b_data,
2280                                                 oepos.offset - (2 * adsize));
2281                         else
2282                                 udf_update_tag(oepos.bh->b_data,
2283                                                 sizeof(struct allocExtDesc));
2284                         mark_buffer_dirty_inode(oepos.bh, inode);
2285                 }
2286         } else {
2287                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2288                 if (!oepos.bh) {
2289                         iinfo->i_lenAlloc -= adsize;
2290                         mark_inode_dirty(inode);
2291                 } else {
2292                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2293                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2294                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2295                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2296                                 udf_update_tag(oepos.bh->b_data,
2297                                                 epos.offset - adsize);
2298                         else
2299                                 udf_update_tag(oepos.bh->b_data,
2300                                                 sizeof(struct allocExtDesc));
2301                         mark_buffer_dirty_inode(oepos.bh, inode);
2302                 }
2303         }
2304
2305         brelse(epos.bh);
2306         brelse(oepos.bh);
2307
2308         return (elen >> 30);
2309 }
2310
2311 int8_t inode_bmap(struct inode *inode, sector_t block,
2312                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2313                   uint32_t *elen, sector_t *offset)
2314 {
2315         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2316         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2317         int8_t etype;
2318         struct udf_inode_info *iinfo;
2319
2320         iinfo = UDF_I(inode);
2321         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2322                 pos->offset = 0;
2323                 pos->block = iinfo->i_location;
2324                 pos->bh = NULL;
2325         }
2326         *elen = 0;
2327         do {
2328                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2329                 if (etype == -1) {
2330                         *offset = (bcount - lbcount) >> blocksize_bits;
2331                         iinfo->i_lenExtents = lbcount;
2332                         return -1;
2333                 }
2334                 lbcount += *elen;
2335         } while (lbcount <= bcount);
2336         /* update extent cache */
2337         udf_update_extent_cache(inode, lbcount - *elen, pos);
2338         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2339
2340         return etype;
2341 }
2342
2343 udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
2344 {
2345         struct kernel_lb_addr eloc;
2346         uint32_t elen;
2347         sector_t offset;
2348         struct extent_position epos = {};
2349         udf_pblk_t ret;
2350
2351         down_read(&UDF_I(inode)->i_data_sem);
2352
2353         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2354                                                 (EXT_RECORDED_ALLOCATED >> 30))
2355                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2356         else
2357                 ret = 0;
2358
2359         up_read(&UDF_I(inode)->i_data_sem);
2360         brelse(epos.bh);
2361
2362         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2363                 return udf_fixed_to_variable(ret);
2364         else
2365                 return ret;
2366 }