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 int 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 int 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_writepage(struct page *page, struct writeback_control *wbc)
 186 {
 187         return block_write_full_page(page, udf_get_block, wbc);
 188 }
 189
 190 static int udf_writepages(struct address_space *mapping,
 191                         struct writeback_control *wbc)
 192 {
 193         return mpage_writepages(mapping, wbc, udf_get_block);
 194 }
 195
 196 static int udf_readpage(struct file *file, struct page *page)
 197 {
 198         return mpage_readpage(page, udf_get_block);
 199 }
 200
 201 static void udf_readahead(struct readahead_control *rac)
 202 {
 203         mpage_readahead(rac, udf_get_block);
 204 }
 205
 206 static int udf_write_begin(struct file *file, struct address_space *mapping,
 207                         loff_t pos, unsigned len, unsigned flags,
 208                         struct page **pagep, void **fsdata)
 209 {
 210         int ret;
 211
 212         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 213         if (unlikely(ret))
 214                 udf_write_failed(mapping, pos + len);
 215         return ret;
 216 }
 217
 218 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 219 {
 220         struct file *file = iocb->ki_filp;
 221         struct address_space *mapping = file->f_mapping;
 222         struct inode *inode = mapping->host;
 223         size_t count = iov_iter_count(iter);
 224         ssize_t ret;
 225
 226         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 227         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 228                 udf_write_failed(mapping, iocb->ki_pos + count);
 229         return ret;
 230 }
 231
 232 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 233 {
 234         return generic_block_bmap(mapping, block, udf_get_block);
 235 }
 236
 237 const struct address_space_operations udf_aops = {
 238         .readpage       = udf_readpage,
 239         .readahead      = udf_readahead,
 240         .writepage      = udf_writepage,
 241         .writepages     = udf_writepages,
 242         .write_begin    = udf_write_begin,
 243         .write_end      = generic_write_end,
 244         .direct_IO      = udf_direct_IO,
 245         .bmap           = udf_bmap,
 246 };
 247
 248 /*
 249  * Expand file stored in ICB to a normal one-block-file
 250  *
 251  * This function requires i_data_sem for writing and releases it.
 252  * This function requires i_mutex held
 253  */
 254 int udf_expand_file_adinicb(struct inode *inode)
 255 {
 256         struct page *page;
 257         char *kaddr;
 258         struct udf_inode_info *iinfo = UDF_I(inode);
 259         int err;
 260
 261         WARN_ON_ONCE(!inode_is_locked(inode));
 262         if (!iinfo->i_lenAlloc) {
 263                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 264                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 265                 else
 266                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 267                 /* from now on we have normal address_space methods */
 268                 inode->i_data.a_ops = &udf_aops;
 269                 up_write(&iinfo->i_data_sem);
 270                 mark_inode_dirty(inode);
 271                 return 0;
 272         }
 273         /*
 274          * Release i_data_sem so that we can lock a page - page lock ranks
 275          * above i_data_sem. i_mutex still protects us against file changes.
 276          */
 277         up_write(&iinfo->i_data_sem);
 278
 279         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 280         if (!page)
 281                 return -ENOMEM;
 282
 283         if (!PageUptodate(page)) {
 284                 kaddr = kmap_atomic(page);
 285                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 286                        PAGE_SIZE - iinfo->i_lenAlloc);
 287                 memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr,
 288                         iinfo->i_lenAlloc);
 289                 flush_dcache_page(page);
 290                 SetPageUptodate(page);
 291                 kunmap_atomic(kaddr);
 292         }
 293         down_write(&iinfo->i_data_sem);
 294         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 295                iinfo->i_lenAlloc);
 296         iinfo->i_lenAlloc = 0;
 297         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 298                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 299         else
 300                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 301         /* from now on we have normal address_space methods */
 302         inode->i_data.a_ops = &udf_aops;
 303         set_page_dirty(page);
 304         unlock_page(page);
 305         up_write(&iinfo->i_data_sem);
 306         err = filemap_fdatawrite(inode->i_mapping);
 307         if (err) {
 308                 /* Restore everything back so that we don't lose data... */
 309                 lock_page(page);
 310                 down_write(&iinfo->i_data_sem);
 311                 kaddr = kmap_atomic(page);
 312                 memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
 313                 kunmap_atomic(kaddr);
 314                 unlock_page(page);
 315                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 316                 inode->i_data.a_ops = &udf_adinicb_aops;
 317                 iinfo->i_lenAlloc = inode->i_size;
 318                 up_write(&iinfo->i_data_sem);
 319         }
 320         put_page(page);
 321         mark_inode_dirty(inode);
 322
 323         return err;
 324 }
 325
 326 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
 327                                             udf_pblk_t *block, int *err)
 328 {
 329         udf_pblk_t newblock;
 330         struct buffer_head *dbh = NULL;
 331         struct kernel_lb_addr eloc;
 332         uint8_t alloctype;
 333         struct extent_position epos;
 334
 335         struct udf_fileident_bh sfibh, dfibh;
 336         loff_t f_pos = udf_ext0_offset(inode);
 337         int size = udf_ext0_offset(inode) + inode->i_size;
 338         struct fileIdentDesc cfi, *sfi, *dfi;
 339         struct udf_inode_info *iinfo = UDF_I(inode);
 340
 341         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 342                 alloctype = ICBTAG_FLAG_AD_SHORT;
 343         else
 344                 alloctype = ICBTAG_FLAG_AD_LONG;
 345
 346         if (!inode->i_size) {
 347                 iinfo->i_alloc_type = alloctype;
 348                 mark_inode_dirty(inode);
 349                 return NULL;
 350         }
 351
 352         /* alloc block, and copy data to it */
 353         *block = udf_new_block(inode->i_sb, inode,
 354                                iinfo->i_location.partitionReferenceNum,
 355                                iinfo->i_location.logicalBlockNum, err);
 356         if (!(*block))
 357                 return NULL;
 358         newblock = udf_get_pblock(inode->i_sb, *block,
 359                                   iinfo->i_location.partitionReferenceNum,
 360                                 0);
 361         if (!newblock)
 362                 return NULL;
 363         dbh = udf_tgetblk(inode->i_sb, newblock);
 364         if (!dbh)
 365                 return NULL;
 366         lock_buffer(dbh);
 367         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 368         set_buffer_uptodate(dbh);
 369         unlock_buffer(dbh);
 370         mark_buffer_dirty_inode(dbh, inode);
 371
 372         sfibh.soffset = sfibh.eoffset =
 373                         f_pos & (inode->i_sb->s_blocksize - 1);
 374         sfibh.sbh = sfibh.ebh = NULL;
 375         dfibh.soffset = dfibh.eoffset = 0;
 376         dfibh.sbh = dfibh.ebh = dbh;
 377         while (f_pos < size) {
 378                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 379                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 380                                          NULL, NULL, NULL);
 381                 if (!sfi) {
 382                         brelse(dbh);
 383                         return NULL;
 384                 }
 385                 iinfo->i_alloc_type = alloctype;
 386                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 387                 dfibh.soffset = dfibh.eoffset;
 388                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 389                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 390                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 391                                  sfi->fileIdent +
 392                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 393                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 394                         brelse(dbh);
 395                         return NULL;
 396                 }
 397         }
 398         mark_buffer_dirty_inode(dbh, inode);
 399
 400         memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
 401         iinfo->i_lenAlloc = 0;
 402         eloc.logicalBlockNum = *block;
 403         eloc.partitionReferenceNum =
 404                                 iinfo->i_location.partitionReferenceNum;
 405         iinfo->i_lenExtents = inode->i_size;
 406         epos.bh = NULL;
 407         epos.block = iinfo->i_location;
 408         epos.offset = udf_file_entry_alloc_offset(inode);
 409         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 410         /* UniqueID stuff */
 411
 412         brelse(epos.bh);
 413         mark_inode_dirty(inode);
 414         return dbh;
 415 }
 416
 417 static int udf_get_block(struct inode *inode, sector_t block,
 418                          struct buffer_head *bh_result, int create)
 419 {
 420         int err, new;
 421         sector_t phys = 0;
 422         struct udf_inode_info *iinfo;
 423
 424         if (!create) {
 425                 phys = udf_block_map(inode, block);
 426                 if (phys)
 427                         map_bh(bh_result, inode->i_sb, phys);
 428                 return 0;
 429         }
 430
 431         err = -EIO;
 432         new = 0;
 433         iinfo = UDF_I(inode);
 434
 435         down_write(&iinfo->i_data_sem);
 436         if (block == iinfo->i_next_alloc_block + 1) {
 437                 iinfo->i_next_alloc_block++;
 438                 iinfo->i_next_alloc_goal++;
 439         }
 440
 441         /*
 442          * Block beyond EOF and prealloc extents? Just discard preallocation
 443          * as it is not useful and complicates things.
 444          */
 445         if (((loff_t)block) << inode->i_blkbits >= iinfo->i_lenExtents)
 446                 udf_discard_prealloc(inode);
 447         udf_clear_extent_cache(inode);
 448         phys = inode_getblk(inode, block, &err, &new);
 449         if (!phys)
 450                 goto abort;
 451
 452         if (new)
 453                 set_buffer_new(bh_result);
 454         map_bh(bh_result, inode->i_sb, phys);
 455
 456 abort:
 457         up_write(&iinfo->i_data_sem);
 458         return err;
 459 }
 460
 461 static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
 462                                       int create, int *err)
 463 {
 464         struct buffer_head *bh;
 465         struct buffer_head dummy;
 466
 467         dummy.b_state = 0;
 468         dummy.b_blocknr = -1000;
 469         *err = udf_get_block(inode, block, &dummy, create);
 470         if (!*err && buffer_mapped(&dummy)) {
 471                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 472                 if (buffer_new(&dummy)) {
 473                         lock_buffer(bh);
 474                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 475                         set_buffer_uptodate(bh);
 476                         unlock_buffer(bh);
 477                         mark_buffer_dirty_inode(bh, inode);
 478                 }
 479                 return bh;
 480         }
 481
 482         return NULL;
 483 }
 484
 485 /* Extend the file with new blocks totaling 'new_block_bytes',
 486  * return the number of extents added
 487  */
 488 static int udf_do_extend_file(struct inode *inode,
 489                               struct extent_position *last_pos,
 490                               struct kernel_long_ad *last_ext,
 491                               loff_t new_block_bytes)
 492 {
 493         uint32_t add;
 494         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 495         struct super_block *sb = inode->i_sb;
 496         struct udf_inode_info *iinfo;
 497         int err;
 498
 499         /* The previous extent is fake and we should not extend by anything
 500          * - there's nothing to do... */
 501         if (!new_block_bytes && fake)
 502                 return 0;
 503
 504         iinfo = UDF_I(inode);
 505         /* Round the last extent up to a multiple of block size */
 506         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 507                 last_ext->extLength =
 508                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 509                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 510                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 511                 iinfo->i_lenExtents =
 512                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 513                         ~(sb->s_blocksize - 1);
 514         }
 515
 516         /* Can we merge with the previous extent? */
 517         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 518                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 519                 add = (1 << 30) - sb->s_blocksize -
 520                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 521                 if (add > new_block_bytes)
 522                         add = new_block_bytes;
 523                 new_block_bytes -= add;
 524                 last_ext->extLength += add;
 525         }
 526
 527         if (fake) {
 528                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 529                                    last_ext->extLength, 1);
 530                 if (err < 0)
 531                         goto out_err;
 532                 count++;
 533         } else {
 534                 struct kernel_lb_addr tmploc;
 535                 uint32_t tmplen;
 536
 537                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 538                                 last_ext->extLength, 1);
 539
 540                 /*
 541                  * We've rewritten the last extent. If we are going to add
 542                  * more extents, we may need to enter possible following
 543                  * empty indirect extent.
 544                  */
 545                 if (new_block_bytes)
 546                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 547         }
 548
 549         /* Managed to do everything necessary? */
 550         if (!new_block_bytes)
 551                 goto out;
 552
 553         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 554         last_ext->extLocation.logicalBlockNum = 0;
 555         last_ext->extLocation.partitionReferenceNum = 0;
 556         add = (1 << 30) - sb->s_blocksize;
 557         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 558
 559         /* Create enough extents to cover the whole hole */
 560         while (new_block_bytes > add) {
 561                 new_block_bytes -= add;
 562                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 563                                    last_ext->extLength, 1);
 564                 if (err)
 565                         goto out_err;
 566                 count++;
 567         }
 568         if (new_block_bytes) {
 569                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 570                         new_block_bytes;
 571                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 572                                    last_ext->extLength, 1);
 573                 if (err)
 574                         goto out_err;
 575                 count++;
 576         }
 577
 578 out:
 579         /* last_pos should point to the last written extent... */
 580         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 581                 last_pos->offset -= sizeof(struct short_ad);
 582         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 583                 last_pos->offset -= sizeof(struct long_ad);
 584         else
 585                 return -EIO;
 586
 587         return count;
 588 out_err:
 589         /* Remove extents we've created so far */
 590         udf_clear_extent_cache(inode);
 591         udf_truncate_extents(inode);
 592         return err;
 593 }
 594
 595 /* Extend the final block of the file to final_block_len bytes */
 596 static void udf_do_extend_final_block(struct inode *inode,
 597                                       struct extent_position *last_pos,
 598                                       struct kernel_long_ad *last_ext,
 599                                       uint32_t new_elen)
 600 {
 601         uint32_t added_bytes;
 602
 603         /*
 604          * Extent already large enough? It may be already rounded up to block
 605          * size...
 606          */
 607         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 608                 return;
 609         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 610         last_ext->extLength += added_bytes;
 611         UDF_I(inode)->i_lenExtents += added_bytes;
 612
 613         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 614                         last_ext->extLength, 1);
 615 }
 616
 617 static int udf_extend_file(struct inode *inode, loff_t newsize)
 618 {
 619
 620         struct extent_position epos;
 621         struct kernel_lb_addr eloc;
 622         uint32_t elen;
 623         int8_t etype;
 624         struct super_block *sb = inode->i_sb;
 625         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 626         loff_t new_elen;
 627         int adsize;
 628         struct udf_inode_info *iinfo = UDF_I(inode);
 629         struct kernel_long_ad extent;
 630         int err = 0;
 631         bool within_last_ext;
 632
 633         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 634                 adsize = sizeof(struct short_ad);
 635         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 636                 adsize = sizeof(struct long_ad);
 637         else
 638                 BUG();
 639
 640         /*
 641          * When creating hole in file, just don't bother with preserving
 642          * preallocation. It likely won't be very useful anyway.
 643          */
 644         udf_discard_prealloc(inode);
 645
 646         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 647         within_last_ext = (etype != -1);
 648         /* We don't expect extents past EOF... */
 649         WARN_ON_ONCE(within_last_ext &&
 650                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 651
 652         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 653             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 654                 /* File has no extents at all or has empty last
 655                  * indirect extent! Create a fake extent... */
 656                 extent.extLocation.logicalBlockNum = 0;
 657                 extent.extLocation.partitionReferenceNum = 0;
 658                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 659         } else {
 660                 epos.offset -= adsize;
 661                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 662                                       &extent.extLength, 0);
 663                 extent.extLength |= etype << 30;
 664         }
 665
 666         new_elen = ((loff_t)offset << inode->i_blkbits) |
 667                                         (newsize & (sb->s_blocksize - 1));
 668
 669         /* File has extent covering the new size (could happen when extending
 670          * inside a block)?
 671          */
 672         if (within_last_ext) {
 673                 /* Extending file within the last file block */
 674                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 675         } else {
 676                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 677         }
 678
 679         if (err < 0)
 680                 goto out;
 681         err = 0;
 682         iinfo->i_lenExtents = newsize;
 683 out:
 684         brelse(epos.bh);
 685         return err;
 686 }
 687
 688 static sector_t inode_getblk(struct inode *inode, sector_t block,
 689                              int *err, int *new)
 690 {
 691         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 692         struct extent_position prev_epos, cur_epos, next_epos;
 693         int count = 0, startnum = 0, endnum = 0;
 694         uint32_t elen = 0, tmpelen;
 695         struct kernel_lb_addr eloc, tmpeloc;
 696         int c = 1;
 697         loff_t lbcount = 0, b_off = 0;
 698         udf_pblk_t newblocknum, newblock = 0;
 699         sector_t offset = 0;
 700         int8_t etype;
 701         struct udf_inode_info *iinfo = UDF_I(inode);
 702         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 703         int lastblock = 0;
 704         bool isBeyondEOF;
 705
 706         *err = 0;
 707         *new = 0;
 708         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 709         prev_epos.block = iinfo->i_location;
 710         prev_epos.bh = NULL;
 711         cur_epos = next_epos = prev_epos;
 712         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 713
 714         /* find the extent which contains the block we are looking for.
 715            alternate between laarr[0] and laarr[1] for locations of the
 716            current extent, and the previous extent */
 717         do {
 718                 if (prev_epos.bh != cur_epos.bh) {
 719                         brelse(prev_epos.bh);
 720                         get_bh(cur_epos.bh);
 721                         prev_epos.bh = cur_epos.bh;
 722                 }
 723                 if (cur_epos.bh != next_epos.bh) {
 724                         brelse(cur_epos.bh);
 725                         get_bh(next_epos.bh);
 726                         cur_epos.bh = next_epos.bh;
 727                 }
 728
 729                 lbcount += elen;
 730
 731                 prev_epos.block = cur_epos.block;
 732                 cur_epos.block = next_epos.block;
 733
 734                 prev_epos.offset = cur_epos.offset;
 735                 cur_epos.offset = next_epos.offset;
 736
 737                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 738                 if (etype == -1)
 739                         break;
 740
 741                 c = !c;
 742
 743                 laarr[c].extLength = (etype << 30) | elen;
 744                 laarr[c].extLocation = eloc;
 745
 746                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 747                         pgoal = eloc.logicalBlockNum +
 748                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 749                                  inode->i_sb->s_blocksize_bits);
 750
 751                 count++;
 752         } while (lbcount + elen <= b_off);
 753
 754         b_off -= lbcount;
 755         offset = b_off >> inode->i_sb->s_blocksize_bits;
 756         /*
 757          * Move prev_epos and cur_epos into indirect extent if we are at
 758          * the pointer to it
 759          */
 760         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 761         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 762
 763         /* if the extent is allocated and recorded, return the block
 764            if the extent is not a multiple of the blocksize, round up */
 765
 766         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 767                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 768                         elen = EXT_RECORDED_ALLOCATED |
 769                                 ((elen + inode->i_sb->s_blocksize - 1) &
 770                                  ~(inode->i_sb->s_blocksize - 1));
 771                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 772                 }
 773                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 774                 goto out_free;
 775         }
 776
 777         /* Are we beyond EOF and preallocated extent? */
 778         if (etype == -1) {
 779                 int ret;
 780                 loff_t hole_len;
 781
 782                 isBeyondEOF = true;
 783                 if (count) {
 784                         if (c)
 785                                 laarr[0] = laarr[1];
 786                         startnum = 1;
 787                 } else {
 788                         /* Create a fake extent when there's not one */
 789                         memset(&laarr[0].extLocation, 0x00,
 790                                 sizeof(struct kernel_lb_addr));
 791                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 792                         /* Will udf_do_extend_file() create real extent from
 793                            a fake one? */
 794                         startnum = (offset > 0);
 795                 }
 796                 /* Create extents for the hole between EOF and offset */
 797                 hole_len = (loff_t)offset << inode->i_blkbits;
 798                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 799                 if (ret < 0) {
 800                         *err = ret;
 801                         goto out_free;
 802                 }
 803                 c = 0;
 804                 offset = 0;
 805                 count += ret;
 806                 /*
 807                  * Is there any real extent? - otherwise we overwrite the fake
 808                  * one...
 809                  */
 810                 if (count)
 811                         c = !c;
 812                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 813                         inode->i_sb->s_blocksize;
 814                 memset(&laarr[c].extLocation, 0x00,
 815                         sizeof(struct kernel_lb_addr));
 816                 count++;
 817                 endnum = c + 1;
 818                 lastblock = 1;
 819         } else {
 820                 isBeyondEOF = false;
 821                 endnum = startnum = ((count > 2) ? 2 : count);
 822
 823                 /* if the current extent is in position 0,
 824                    swap it with the previous */
 825                 if (!c && count != 1) {
 826                         laarr[2] = laarr[0];
 827                         laarr[0] = laarr[1];
 828                         laarr[1] = laarr[2];
 829                         c = 1;
 830                 }
 831
 832                 /* if the current block is located in an extent,
 833                    read the next extent */
 834                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 835                 if (etype != -1) {
 836                         laarr[c + 1].extLength = (etype << 30) | elen;
 837                         laarr[c + 1].extLocation = eloc;
 838                         count++;
 839                         startnum++;
 840                         endnum++;
 841                 } else
 842                         lastblock = 1;
 843         }
 844
 845         /* if the current extent is not recorded but allocated, get the
 846          * block in the extent corresponding to the requested block */
 847         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 848                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 849         else { /* otherwise, allocate a new block */
 850                 if (iinfo->i_next_alloc_block == block)
 851                         goal = iinfo->i_next_alloc_goal;
 852
 853                 if (!goal) {
 854                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 855                                 goal = iinfo->i_location.logicalBlockNum + 1;
 856                 }
 857
 858                 newblocknum = udf_new_block(inode->i_sb, inode,
 859                                 iinfo->i_location.partitionReferenceNum,
 860                                 goal, err);
 861                 if (!newblocknum) {
 862                         *err = -ENOSPC;
 863                         goto out_free;
 864                 }
 865                 if (isBeyondEOF)
 866                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 867         }
 868
 869         /* if the extent the requsted block is located in contains multiple
 870          * blocks, split the extent into at most three extents. blocks prior
 871          * to requested block, requested block, and blocks after requested
 872          * block */
 873         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 874
 875         /* We preallocate blocks only for regular files. It also makes sense
 876          * for directories but there's a problem when to drop the
 877          * preallocation. We might use some delayed work for that but I feel
 878          * it's overengineering for a filesystem like UDF. */
 879         if (S_ISREG(inode->i_mode))
 880                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 881
 882         /* merge any continuous blocks in laarr */
 883         udf_merge_extents(inode, laarr, &endnum);
 884
 885         /* write back the new extents, inserting new extents if the new number
 886          * of extents is greater than the old number, and deleting extents if
 887          * the new number of extents is less than the old number */
 888         *err = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 889         if (*err < 0)
 890                 goto out_free;
 891
 892         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 893                                 iinfo->i_location.partitionReferenceNum, 0);
 894         if (!newblock) {
 895                 *err = -EIO;
 896                 goto out_free;
 897         }
 898         *new = 1;
 899         iinfo->i_next_alloc_block = block;
 900         iinfo->i_next_alloc_goal = newblocknum;
 901         inode->i_ctime = current_time(inode);
 902
 903         if (IS_SYNC(inode))
 904                 udf_sync_inode(inode);
 905         else
 906                 mark_inode_dirty(inode);
 907 out_free:
 908         brelse(prev_epos.bh);
 909         brelse(cur_epos.bh);
 910         brelse(next_epos.bh);
 911         return newblock;
 912 }
 913
 914 static void udf_split_extents(struct inode *inode, int *c, int offset,
 915                                udf_pblk_t newblocknum,
 916                                struct kernel_long_ad *laarr, int *endnum)
 917 {
 918         unsigned long blocksize = inode->i_sb->s_blocksize;
 919         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 920
 921         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 922             (laarr[*c].extLength >> 30) ==
 923                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 924                 int curr = *c;
 925                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 926                             blocksize - 1) >> blocksize_bits;
 927                 int8_t etype = (laarr[curr].extLength >> 30);
 928
 929                 if (blen == 1)
 930                         ;
 931                 else if (!offset || blen == offset + 1) {
 932                         laarr[curr + 2] = laarr[curr + 1];
 933                         laarr[curr + 1] = laarr[curr];
 934                 } else {
 935                         laarr[curr + 3] = laarr[curr + 1];
 936                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 937                 }
 938
 939                 if (offset) {
 940                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 941                                 udf_free_blocks(inode->i_sb, inode,
 942                                                 &laarr[curr].extLocation,
 943                                                 0, offset);
 944                                 laarr[curr].extLength =
 945                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 946                                         (offset << blocksize_bits);
 947                                 laarr[curr].extLocation.logicalBlockNum = 0;
 948                                 laarr[curr].extLocation.
 949                                                 partitionReferenceNum = 0;
 950                         } else
 951                                 laarr[curr].extLength = (etype << 30) |
 952                                         (offset << blocksize_bits);
 953                         curr++;
 954                         (*c)++;
 955                         (*endnum)++;
 956                 }
 957
 958                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 959                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 960                         laarr[curr].extLocation.partitionReferenceNum =
 961                                 UDF_I(inode)->i_location.partitionReferenceNum;
 962                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 963                         blocksize;
 964                 curr++;
 965
 966                 if (blen != offset + 1) {
 967                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 968                                 laarr[curr].extLocation.logicalBlockNum +=
 969                                                                 offset + 1;
 970                         laarr[curr].extLength = (etype << 30) |
 971                                 ((blen - (offset + 1)) << blocksize_bits);
 972                         curr++;
 973                         (*endnum)++;
 974                 }
 975         }
 976 }
 977
 978 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 979                                  struct kernel_long_ad *laarr,
 980                                  int *endnum)
 981 {
 982         int start, length = 0, currlength = 0, i;
 983
 984         if (*endnum >= (c + 1)) {
 985                 if (!lastblock)
 986                         return;
 987                 else
 988                         start = c;
 989         } else {
 990                 if ((laarr[c + 1].extLength >> 30) ==
 991                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 992                         start = c + 1;
 993                         length = currlength =
 994                                 (((laarr[c + 1].extLength &
 995                                         UDF_EXTENT_LENGTH_MASK) +
 996                                 inode->i_sb->s_blocksize - 1) >>
 997                                 inode->i_sb->s_blocksize_bits);
 998                 } else
 999                         start = c;
1000         }
1001
1002         for (i = start + 1; i <= *endnum; i++) {
1003                 if (i == *endnum) {
1004                         if (lastblock)
1005                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1006                 } else if ((laarr[i].extLength >> 30) ==
1007                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1008                         length += (((laarr[i].extLength &
1009                                                 UDF_EXTENT_LENGTH_MASK) +
1010                                     inode->i_sb->s_blocksize - 1) >>
1011                                     inode->i_sb->s_blocksize_bits);
1012                 } else
1013                         break;
1014         }
1015
1016         if (length) {
1017                 int next = laarr[start].extLocation.logicalBlockNum +
1018                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1019                           inode->i_sb->s_blocksize - 1) >>
1020                           inode->i_sb->s_blocksize_bits);
1021                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1022                                 laarr[start].extLocation.partitionReferenceNum,
1023                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1024                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1025                                 currlength);
1026                 if (numalloc)   {
1027                         if (start == (c + 1))
1028                                 laarr[start].extLength +=
1029                                         (numalloc <<
1030                                          inode->i_sb->s_blocksize_bits);
1031                         else {
1032                                 memmove(&laarr[c + 2], &laarr[c + 1],
1033                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1034                                 (*endnum)++;
1035                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1036                                 laarr[c + 1].extLocation.partitionReferenceNum =
1037                                         laarr[c].extLocation.
1038                                                         partitionReferenceNum;
1039                                 laarr[c + 1].extLength =
1040                                         EXT_NOT_RECORDED_ALLOCATED |
1041                                         (numalloc <<
1042                                          inode->i_sb->s_blocksize_bits);
1043                                 start = c + 1;
1044                         }
1045
1046                         for (i = start + 1; numalloc && i < *endnum; i++) {
1047                                 int elen = ((laarr[i].extLength &
1048                                                 UDF_EXTENT_LENGTH_MASK) +
1049                                             inode->i_sb->s_blocksize - 1) >>
1050                                             inode->i_sb->s_blocksize_bits;
1051
1052                                 if (elen > numalloc) {
1053                                         laarr[i].extLength -=
1054                                                 (numalloc <<
1055                                                  inode->i_sb->s_blocksize_bits);
1056                                         numalloc = 0;
1057                                 } else {
1058                                         numalloc -= elen;
1059                                         if (*endnum > (i + 1))
1060                                                 memmove(&laarr[i],
1061                                                         &laarr[i + 1],
1062                                                         sizeof(struct long_ad) *
1063                                                         (*endnum - (i + 1)));
1064                                         i--;
1065                                         (*endnum)--;
1066                                 }
1067                         }
1068                         UDF_I(inode)->i_lenExtents +=
1069                                 numalloc << inode->i_sb->s_blocksize_bits;
1070                 }
1071         }
1072 }
1073
1074 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1075                               int *endnum)
1076 {
1077         int i;
1078         unsigned long blocksize = inode->i_sb->s_blocksize;
1079         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1080
1081         for (i = 0; i < (*endnum - 1); i++) {
1082                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1083                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1084
1085                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1086                         (((li->extLength >> 30) ==
1087                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1088                         ((lip1->extLocation.logicalBlockNum -
1089                           li->extLocation.logicalBlockNum) ==
1090                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1091                         blocksize - 1) >> blocksize_bits)))) {
1092
1093                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1094                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1095                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1096                                 li->extLength = lip1->extLength +
1097                                         (((li->extLength &
1098                                                 UDF_EXTENT_LENGTH_MASK) +
1099                                          blocksize - 1) & ~(blocksize - 1));
1100                                 if (*endnum > (i + 2))
1101                                         memmove(&laarr[i + 1], &laarr[i + 2],
1102                                                 sizeof(struct long_ad) *
1103                                                 (*endnum - (i + 2)));
1104                                 i--;
1105                                 (*endnum)--;
1106                         }
1107                 } else if (((li->extLength >> 30) ==
1108                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1109                            ((lip1->extLength >> 30) ==
1110                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1111                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1112                                         ((li->extLength &
1113                                           UDF_EXTENT_LENGTH_MASK) +
1114                                          blocksize - 1) >> blocksize_bits);
1115                         li->extLocation.logicalBlockNum = 0;
1116                         li->extLocation.partitionReferenceNum = 0;
1117
1118                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1119                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1120                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1121                                 lip1->extLength = (lip1->extLength -
1122                                                    (li->extLength &
1123                                                    UDF_EXTENT_LENGTH_MASK) +
1124                                                    UDF_EXTENT_LENGTH_MASK) &
1125                                                    ~(blocksize - 1);
1126                                 li->extLength = (li->extLength &
1127                                                  UDF_EXTENT_FLAG_MASK) +
1128                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1129                                                 blocksize;
1130                         } else {
1131                                 li->extLength = lip1->extLength +
1132                                         (((li->extLength &
1133                                                 UDF_EXTENT_LENGTH_MASK) +
1134                                           blocksize - 1) & ~(blocksize - 1));
1135                                 if (*endnum > (i + 2))
1136                                         memmove(&laarr[i + 1], &laarr[i + 2],
1137                                                 sizeof(struct long_ad) *
1138                                                 (*endnum - (i + 2)));
1139                                 i--;
1140                                 (*endnum)--;
1141                         }
1142                 } else if ((li->extLength >> 30) ==
1143                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1144                         udf_free_blocks(inode->i_sb, inode,
1145                                         &li->extLocation, 0,
1146                                         ((li->extLength &
1147                                                 UDF_EXTENT_LENGTH_MASK) +
1148                                          blocksize - 1) >> blocksize_bits);
1149                         li->extLocation.logicalBlockNum = 0;
1150                         li->extLocation.partitionReferenceNum = 0;
1151                         li->extLength = (li->extLength &
1152                                                 UDF_EXTENT_LENGTH_MASK) |
1153                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1154                 }
1155         }
1156 }
1157
1158 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1159                               int startnum, int endnum,
1160                               struct extent_position *epos)
1161 {
1162         int start = 0, i;
1163         struct kernel_lb_addr tmploc;
1164         uint32_t tmplen;
1165         int err;
1166
1167         if (startnum > endnum) {
1168                 for (i = 0; i < (startnum - endnum); i++)
1169                         udf_delete_aext(inode, *epos);
1170         } else if (startnum < endnum) {
1171                 for (i = 0; i < (endnum - startnum); i++) {
1172                         err = udf_insert_aext(inode, *epos,
1173                                               laarr[i].extLocation,
1174                                               laarr[i].extLength);
1175                         /*
1176                          * If we fail here, we are likely corrupting the extent
1177                          * list and leaking blocks. At least stop early to
1178                          * limit the damage.
1179                          */
1180                         if (err < 0)
1181                                 return err;
1182                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1183                                       &laarr[i].extLength, 1);
1184                         start++;
1185                 }
1186         }
1187
1188         for (i = start; i < endnum; i++) {
1189                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1190                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1191                                laarr[i].extLength, 1);
1192         }
1193         return 0;
1194 }
1195
1196 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1197                               int create, int *err)
1198 {
1199         struct buffer_head *bh = NULL;
1200
1201         bh = udf_getblk(inode, block, create, err);
1202         if (!bh)
1203                 return NULL;
1204
1205         if (buffer_uptodate(bh))
1206                 return bh;
1207
1208         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1209
1210         wait_on_buffer(bh);
1211         if (buffer_uptodate(bh))
1212                 return bh;
1213
1214         brelse(bh);
1215         *err = -EIO;
1216         return NULL;
1217 }
1218
1219 int udf_setsize(struct inode *inode, loff_t newsize)
1220 {
1221         int err;
1222         struct udf_inode_info *iinfo;
1223         unsigned int bsize = i_blocksize(inode);
1224
1225         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1226               S_ISLNK(inode->i_mode)))
1227                 return -EINVAL;
1228         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1229                 return -EPERM;
1230
1231         iinfo = UDF_I(inode);
1232         if (newsize > inode->i_size) {
1233                 down_write(&iinfo->i_data_sem);
1234                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1235                         if (bsize <
1236                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1237                                 err = udf_expand_file_adinicb(inode);
1238                                 if (err)
1239                                         return err;
1240                                 down_write(&iinfo->i_data_sem);
1241                         } else {
1242                                 iinfo->i_lenAlloc = newsize;
1243                                 goto set_size;
1244                         }
1245                 }
1246                 err = udf_extend_file(inode, newsize);
1247                 if (err) {
1248                         up_write(&iinfo->i_data_sem);
1249                         return err;
1250                 }
1251 set_size:
1252                 up_write(&iinfo->i_data_sem);
1253                 truncate_setsize(inode, newsize);
1254         } else {
1255                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1256                         down_write(&iinfo->i_data_sem);
1257                         udf_clear_extent_cache(inode);
1258                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1259                                0x00, bsize - newsize -
1260                                udf_file_entry_alloc_offset(inode));
1261                         iinfo->i_lenAlloc = newsize;
1262                         truncate_setsize(inode, newsize);
1263                         up_write(&iinfo->i_data_sem);
1264                         goto update_time;
1265                 }
1266                 err = block_truncate_page(inode->i_mapping, newsize,
1267                                           udf_get_block);
1268                 if (err)
1269                         return err;
1270                 truncate_setsize(inode, newsize);
1271                 down_write(&iinfo->i_data_sem);
1272                 udf_clear_extent_cache(inode);
1273                 err = udf_truncate_extents(inode);
1274                 up_write(&iinfo->i_data_sem);
1275                 if (err)
1276                         return err;
1277         }
1278 update_time:
1279         inode->i_mtime = inode->i_ctime = current_time(inode);
1280         if (IS_SYNC(inode))
1281                 udf_sync_inode(inode);
1282         else
1283                 mark_inode_dirty(inode);
1284         return 0;
1285 }
1286
1287 /*
1288  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1289  * arbitrary - just that we hopefully don't limit any real use of rewritten
1290  * inode on write-once media but avoid looping for too long on corrupted media.
1291  */
1292 #define UDF_MAX_ICB_NESTING 1024
1293
1294 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1295 {
1296         struct buffer_head *bh = NULL;
1297         struct fileEntry *fe;
1298         struct extendedFileEntry *efe;
1299         uint16_t ident;
1300         struct udf_inode_info *iinfo = UDF_I(inode);
1301         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1302         struct kernel_lb_addr *iloc = &iinfo->i_location;
1303         unsigned int link_count;
1304         unsigned int indirections = 0;
1305         int bs = inode->i_sb->s_blocksize;
1306         int ret = -EIO;
1307         uint32_t uid, gid;
1308
1309 reread:
1310         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1311                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1312                           iloc->partitionReferenceNum, sbi->s_partitions);
1313                 return -EIO;
1314         }
1315
1316         if (iloc->logicalBlockNum >=
1317             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1318                 udf_debug("block=%u, partition=%u out of range\n",
1319                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1320                 return -EIO;
1321         }
1322
1323         /*
1324          * Set defaults, but the inode is still incomplete!
1325          * Note: get_new_inode() sets the following on a new inode:
1326          *      i_sb = sb
1327          *      i_no = ino
1328          *      i_flags = sb->s_flags
1329          *      i_state = 0
1330          * clean_inode(): zero fills and sets
1331          *      i_count = 1
1332          *      i_nlink = 1
1333          *      i_op = NULL;
1334          */
1335         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1336         if (!bh) {
1337                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1338                 return -EIO;
1339         }
1340
1341         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1342             ident != TAG_IDENT_USE) {
1343                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1344                         inode->i_ino, ident);
1345                 goto out;
1346         }
1347
1348         fe = (struct fileEntry *)bh->b_data;
1349         efe = (struct extendedFileEntry *)bh->b_data;
1350
1351         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1352                 struct buffer_head *ibh;
1353
1354                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1355                 if (ident == TAG_IDENT_IE && ibh) {
1356                         struct kernel_lb_addr loc;
1357                         struct indirectEntry *ie;
1358
1359                         ie = (struct indirectEntry *)ibh->b_data;
1360                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1361
1362                         if (ie->indirectICB.extLength) {
1363                                 brelse(ibh);
1364                                 memcpy(&iinfo->i_location, &loc,
1365                                        sizeof(struct kernel_lb_addr));
1366                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1367                                         udf_err(inode->i_sb,
1368                                                 "too many ICBs in ICB hierarchy"
1369                                                 " (max %d supported)\n",
1370                                                 UDF_MAX_ICB_NESTING);
1371                                         goto out;
1372                                 }
1373                                 brelse(bh);
1374                                 goto reread;
1375                         }
1376                 }
1377                 brelse(ibh);
1378         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1379                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1380                         le16_to_cpu(fe->icbTag.strategyType));
1381                 goto out;
1382         }
1383         if (fe->icbTag.strategyType == cpu_to_le16(4))
1384                 iinfo->i_strat4096 = 0;
1385         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1386                 iinfo->i_strat4096 = 1;
1387
1388         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1389                                                         ICBTAG_FLAG_AD_MASK;
1390         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1391             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1392             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1393                 ret = -EIO;
1394                 goto out;
1395         }
1396         iinfo->i_hidden = hidden_inode;
1397         iinfo->i_unique = 0;
1398         iinfo->i_lenEAttr = 0;
1399         iinfo->i_lenExtents = 0;
1400         iinfo->i_lenAlloc = 0;
1401         iinfo->i_next_alloc_block = 0;
1402         iinfo->i_next_alloc_goal = 0;
1403         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1404                 iinfo->i_efe = 1;
1405                 iinfo->i_use = 0;
1406                 ret = udf_alloc_i_data(inode, bs -
1407                                         sizeof(struct extendedFileEntry));
1408                 if (ret)
1409                         goto out;
1410                 memcpy(iinfo->i_data,
1411                        bh->b_data + sizeof(struct extendedFileEntry),
1412                        bs - sizeof(struct extendedFileEntry));
1413         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1414                 iinfo->i_efe = 0;
1415                 iinfo->i_use = 0;
1416                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1417                 if (ret)
1418                         goto out;
1419                 memcpy(iinfo->i_data,
1420                        bh->b_data + sizeof(struct fileEntry),
1421                        bs - sizeof(struct fileEntry));
1422         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1423                 iinfo->i_efe = 0;
1424                 iinfo->i_use = 1;
1425                 iinfo->i_lenAlloc = le32_to_cpu(
1426                                 ((struct unallocSpaceEntry *)bh->b_data)->
1427                                  lengthAllocDescs);
1428                 ret = udf_alloc_i_data(inode, bs -
1429                                         sizeof(struct unallocSpaceEntry));
1430                 if (ret)
1431                         goto out;
1432                 memcpy(iinfo->i_data,
1433                        bh->b_data + sizeof(struct unallocSpaceEntry),
1434                        bs - sizeof(struct unallocSpaceEntry));
1435                 return 0;
1436         }
1437
1438         ret = -EIO;
1439         read_lock(&sbi->s_cred_lock);
1440         uid = le32_to_cpu(fe->uid);
1441         if (uid == UDF_INVALID_ID ||
1442             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1443                 inode->i_uid = sbi->s_uid;
1444         else
1445                 i_uid_write(inode, uid);
1446
1447         gid = le32_to_cpu(fe->gid);
1448         if (gid == UDF_INVALID_ID ||
1449             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1450                 inode->i_gid = sbi->s_gid;
1451         else
1452                 i_gid_write(inode, gid);
1453
1454         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1455                         sbi->s_fmode != UDF_INVALID_MODE)
1456                 inode->i_mode = sbi->s_fmode;
1457         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1458                         sbi->s_dmode != UDF_INVALID_MODE)
1459                 inode->i_mode = sbi->s_dmode;
1460         else
1461                 inode->i_mode = udf_convert_permissions(fe);
1462         inode->i_mode &= ~sbi->s_umask;
1463         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1464
1465         read_unlock(&sbi->s_cred_lock);
1466
1467         link_count = le16_to_cpu(fe->fileLinkCount);
1468         if (!link_count) {
1469                 if (!hidden_inode) {
1470                         ret = -ESTALE;
1471                         goto out;
1472                 }
1473                 link_count = 1;
1474         }
1475         set_nlink(inode, link_count);
1476
1477         inode->i_size = le64_to_cpu(fe->informationLength);
1478         iinfo->i_lenExtents = inode->i_size;
1479
1480         if (iinfo->i_efe == 0) {
1481                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1482                         (inode->i_sb->s_blocksize_bits - 9);
1483
1484                 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1485                 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1486                 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1487
1488                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1489                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1490                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1491                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1492                 iinfo->i_streamdir = 0;
1493                 iinfo->i_lenStreams = 0;
1494         } else {
1495                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1496                     (inode->i_sb->s_blocksize_bits - 9);
1497
1498                 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1499                 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1500                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1501                 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1502
1503                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1504                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1505                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1506                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1507
1508                 /* Named streams */
1509                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1510                 iinfo->i_locStreamdir =
1511                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1512                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1513                 if (iinfo->i_lenStreams >= inode->i_size)
1514                         iinfo->i_lenStreams -= inode->i_size;
1515                 else
1516                         iinfo->i_lenStreams = 0;
1517         }
1518         inode->i_generation = iinfo->i_unique;
1519
1520         /*
1521          * Sanity check length of allocation descriptors and extended attrs to
1522          * avoid integer overflows
1523          */
1524         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1525                 goto out;
1526         /* Now do exact checks */
1527         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1528                 goto out;
1529         /* Sanity checks for files in ICB so that we don't get confused later */
1530         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1531                 /*
1532                  * For file in ICB data is stored in allocation descriptor
1533                  * so sizes should match
1534                  */
1535                 if (iinfo->i_lenAlloc != inode->i_size)
1536                         goto out;
1537                 /* File in ICB has to fit in there... */
1538                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1539                         goto out;
1540         }
1541
1542         switch (fe->icbTag.fileType) {
1543         case ICBTAG_FILE_TYPE_DIRECTORY:
1544                 inode->i_op = &udf_dir_inode_operations;
1545                 inode->i_fop = &udf_dir_operations;
1546                 inode->i_mode |= S_IFDIR;
1547                 inc_nlink(inode);
1548                 break;
1549         case ICBTAG_FILE_TYPE_REALTIME:
1550         case ICBTAG_FILE_TYPE_REGULAR:
1551         case ICBTAG_FILE_TYPE_UNDEF:
1552         case ICBTAG_FILE_TYPE_VAT20:
1553                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1554                         inode->i_data.a_ops = &udf_adinicb_aops;
1555                 else
1556                         inode->i_data.a_ops = &udf_aops;
1557                 inode->i_op = &udf_file_inode_operations;
1558                 inode->i_fop = &udf_file_operations;
1559                 inode->i_mode |= S_IFREG;
1560                 break;
1561         case ICBTAG_FILE_TYPE_BLOCK:
1562                 inode->i_mode |= S_IFBLK;
1563                 break;
1564         case ICBTAG_FILE_TYPE_CHAR:
1565                 inode->i_mode |= S_IFCHR;
1566                 break;
1567         case ICBTAG_FILE_TYPE_FIFO:
1568                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1569                 break;
1570         case ICBTAG_FILE_TYPE_SOCKET:
1571                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1572                 break;
1573         case ICBTAG_FILE_TYPE_SYMLINK:
1574                 inode->i_data.a_ops = &udf_symlink_aops;
1575                 inode->i_op = &udf_symlink_inode_operations;
1576                 inode_nohighmem(inode);
1577                 inode->i_mode = S_IFLNK | 0777;
1578                 break;
1579         case ICBTAG_FILE_TYPE_MAIN:
1580                 udf_debug("METADATA FILE-----\n");
1581                 break;
1582         case ICBTAG_FILE_TYPE_MIRROR:
1583                 udf_debug("METADATA MIRROR FILE-----\n");
1584                 break;
1585         case ICBTAG_FILE_TYPE_BITMAP:
1586                 udf_debug("METADATA BITMAP FILE-----\n");
1587                 break;
1588         default:
1589                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1590                         inode->i_ino, fe->icbTag.fileType);
1591                 goto out;
1592         }
1593         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1594                 struct deviceSpec *dsea =
1595                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1596                 if (dsea) {
1597                         init_special_inode(inode, inode->i_mode,
1598                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1599                                       le32_to_cpu(dsea->minorDeviceIdent)));
1600                         /* Developer ID ??? */
1601                 } else
1602                         goto out;
1603         }
1604         ret = 0;
1605 out:
1606         brelse(bh);
1607         return ret;
1608 }
1609
1610 static int udf_alloc_i_data(struct inode *inode, size_t size)
1611 {
1612         struct udf_inode_info *iinfo = UDF_I(inode);
1613         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1614         if (!iinfo->i_data)
1615                 return -ENOMEM;
1616         return 0;
1617 }
1618
1619 static umode_t udf_convert_permissions(struct fileEntry *fe)
1620 {
1621         umode_t mode;
1622         uint32_t permissions;
1623         uint32_t flags;
1624
1625         permissions = le32_to_cpu(fe->permissions);
1626         flags = le16_to_cpu(fe->icbTag.flags);
1627
1628         mode =  ((permissions) & 0007) |
1629                 ((permissions >> 2) & 0070) |
1630                 ((permissions >> 4) & 0700) |
1631                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1632                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1633                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1634
1635         return mode;
1636 }
1637
1638 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1639 {
1640         struct udf_inode_info *iinfo = UDF_I(inode);
1641
1642         /*
1643          * UDF 2.01 sec. 3.3.3.3 Note 2:
1644          * In Unix, delete permission tracks write
1645          */
1646         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1647         if (mode & 0200)
1648                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1649         if (mode & 0020)
1650                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1651         if (mode & 0002)
1652                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1653 }
1654
1655 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1656 {
1657         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1658 }
1659
1660 static int udf_sync_inode(struct inode *inode)
1661 {
1662         return udf_update_inode(inode, 1);
1663 }
1664
1665 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1666 {
1667         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1668             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1669              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1670                 iinfo->i_crtime = time;
1671 }
1672
1673 static int udf_update_inode(struct inode *inode, int do_sync)
1674 {
1675         struct buffer_head *bh = NULL;
1676         struct fileEntry *fe;
1677         struct extendedFileEntry *efe;
1678         uint64_t lb_recorded;
1679         uint32_t udfperms;
1680         uint16_t icbflags;
1681         uint16_t crclen;
1682         int err = 0;
1683         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1684         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1685         struct udf_inode_info *iinfo = UDF_I(inode);
1686
1687         bh = udf_tgetblk(inode->i_sb,
1688                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1689         if (!bh) {
1690                 udf_debug("getblk failure\n");
1691                 return -EIO;
1692         }
1693
1694         lock_buffer(bh);
1695         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1696         fe = (struct fileEntry *)bh->b_data;
1697         efe = (struct extendedFileEntry *)bh->b_data;
1698
1699         if (iinfo->i_use) {
1700                 struct unallocSpaceEntry *use =
1701                         (struct unallocSpaceEntry *)bh->b_data;
1702
1703                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1704                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1705                        iinfo->i_data, inode->i_sb->s_blocksize -
1706                                         sizeof(struct unallocSpaceEntry));
1707                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1708                 crclen = sizeof(struct unallocSpaceEntry);
1709
1710                 goto finish;
1711         }
1712
1713         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1714                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1715         else
1716                 fe->uid = cpu_to_le32(i_uid_read(inode));
1717
1718         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1719                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1720         else
1721                 fe->gid = cpu_to_le32(i_gid_read(inode));
1722
1723         udfperms = ((inode->i_mode & 0007)) |
1724                    ((inode->i_mode & 0070) << 2) |
1725                    ((inode->i_mode & 0700) << 4);
1726
1727         udfperms |= iinfo->i_extraPerms;
1728         fe->permissions = cpu_to_le32(udfperms);
1729
1730         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1731                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1732         else {
1733                 if (iinfo->i_hidden)
1734                         fe->fileLinkCount = cpu_to_le16(0);
1735                 else
1736                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1737         }
1738
1739         fe->informationLength = cpu_to_le64(inode->i_size);
1740
1741         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1742                 struct regid *eid;
1743                 struct deviceSpec *dsea =
1744                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1745                 if (!dsea) {
1746                         dsea = (struct deviceSpec *)
1747                                 udf_add_extendedattr(inode,
1748                                                      sizeof(struct deviceSpec) +
1749                                                      sizeof(struct regid), 12, 0x3);
1750                         dsea->attrType = cpu_to_le32(12);
1751                         dsea->attrSubtype = 1;
1752                         dsea->attrLength = cpu_to_le32(
1753                                                 sizeof(struct deviceSpec) +
1754                                                 sizeof(struct regid));
1755                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1756                 }
1757                 eid = (struct regid *)dsea->impUse;
1758                 memset(eid, 0, sizeof(*eid));
1759                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1760                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1761                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1762                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1763                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1764         }
1765
1766         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1767                 lb_recorded = 0; /* No extents => no blocks! */
1768         else
1769                 lb_recorded =
1770                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1771                         (blocksize_bits - 9);
1772
1773         if (iinfo->i_efe == 0) {
1774                 memcpy(bh->b_data + sizeof(struct fileEntry),
1775                        iinfo->i_data,
1776                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1777                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1778
1779                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1780                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1781                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1782                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1783                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1784                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1785                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1786                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1787                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1788                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1789                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1790                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1791                 crclen = sizeof(struct fileEntry);
1792         } else {
1793                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1794                        iinfo->i_data,
1795                        inode->i_sb->s_blocksize -
1796                                         sizeof(struct extendedFileEntry));
1797                 efe->objectSize =
1798                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1799                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1800
1801                 if (iinfo->i_streamdir) {
1802                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1803
1804                         icb_lad->extLocation =
1805                                 cpu_to_lelb(iinfo->i_locStreamdir);
1806                         icb_lad->extLength =
1807                                 cpu_to_le32(inode->i_sb->s_blocksize);
1808                 }
1809
1810                 udf_adjust_time(iinfo, inode->i_atime);
1811                 udf_adjust_time(iinfo, inode->i_mtime);
1812                 udf_adjust_time(iinfo, inode->i_ctime);
1813
1814                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1815                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1816                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1817                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1818
1819                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1820                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1821                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1822                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1823                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1824                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1825                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1826                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1827                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1828                 crclen = sizeof(struct extendedFileEntry);
1829         }
1830
1831 finish:
1832         if (iinfo->i_strat4096) {
1833                 fe->icbTag.strategyType = cpu_to_le16(4096);
1834                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1835                 fe->icbTag.numEntries = cpu_to_le16(2);
1836         } else {
1837                 fe->icbTag.strategyType = cpu_to_le16(4);
1838                 fe->icbTag.numEntries = cpu_to_le16(1);
1839         }
1840
1841         if (iinfo->i_use)
1842                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1843         else if (S_ISDIR(inode->i_mode))
1844                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1845         else if (S_ISREG(inode->i_mode))
1846                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1847         else if (S_ISLNK(inode->i_mode))
1848                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1849         else if (S_ISBLK(inode->i_mode))
1850                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1851         else if (S_ISCHR(inode->i_mode))
1852                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1853         else if (S_ISFIFO(inode->i_mode))
1854                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1855         else if (S_ISSOCK(inode->i_mode))
1856                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1857
1858         icbflags =      iinfo->i_alloc_type |
1859                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1860                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1861                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1862                         (le16_to_cpu(fe->icbTag.flags) &
1863                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1864                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1865
1866         fe->icbTag.flags = cpu_to_le16(icbflags);
1867         if (sbi->s_udfrev >= 0x0200)
1868                 fe->descTag.descVersion = cpu_to_le16(3);
1869         else
1870                 fe->descTag.descVersion = cpu_to_le16(2);
1871         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1872         fe->descTag.tagLocation = cpu_to_le32(
1873                                         iinfo->i_location.logicalBlockNum);
1874         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1875         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1876         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1877                                                   crclen));
1878         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1879
1880         set_buffer_uptodate(bh);
1881         unlock_buffer(bh);
1882
1883         /* write the data blocks */
1884         mark_buffer_dirty(bh);
1885         if (do_sync) {
1886                 sync_dirty_buffer(bh);
1887                 if (buffer_write_io_error(bh)) {
1888                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1889                                  inode->i_ino);
1890                         err = -EIO;
1891                 }
1892         }
1893         brelse(bh);
1894
1895         return err;
1896 }
1897
1898 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1899                          bool hidden_inode)
1900 {
1901         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1902         struct inode *inode = iget_locked(sb, block);
1903         int err;
1904
1905         if (!inode)
1906                 return ERR_PTR(-ENOMEM);
1907
1908         if (!(inode->i_state & I_NEW)) {
1909                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1910                         iput(inode);
1911                         return ERR_PTR(-EFSCORRUPTED);
1912                 }
1913                 return inode;
1914         }
1915
1916         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1917         err = udf_read_inode(inode, hidden_inode);
1918         if (err < 0) {
1919                 iget_failed(inode);
1920                 return ERR_PTR(err);
1921         }
1922         unlock_new_inode(inode);
1923
1924         return inode;
1925 }
1926
1927 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1928                             struct extent_position *epos)
1929 {
1930         struct super_block *sb = inode->i_sb;
1931         struct buffer_head *bh;
1932         struct allocExtDesc *aed;
1933         struct extent_position nepos;
1934         struct kernel_lb_addr neloc;
1935         int ver, adsize;
1936
1937         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1938                 adsize = sizeof(struct short_ad);
1939         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1940                 adsize = sizeof(struct long_ad);
1941         else
1942                 return -EIO;
1943
1944         neloc.logicalBlockNum = block;
1945         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1946
1947         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1948         if (!bh)
1949                 return -EIO;
1950         lock_buffer(bh);
1951         memset(bh->b_data, 0x00, sb->s_blocksize);
1952         set_buffer_uptodate(bh);
1953         unlock_buffer(bh);
1954         mark_buffer_dirty_inode(bh, inode);
1955
1956         aed = (struct allocExtDesc *)(bh->b_data);
1957         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1958                 aed->previousAllocExtLocation =
1959                                 cpu_to_le32(epos->block.logicalBlockNum);
1960         }
1961         aed->lengthAllocDescs = cpu_to_le32(0);
1962         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1963                 ver = 3;
1964         else
1965                 ver = 2;
1966         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1967                     sizeof(struct tag));
1968
1969         nepos.block = neloc;
1970         nepos.offset = sizeof(struct allocExtDesc);
1971         nepos.bh = bh;
1972
1973         /*
1974          * Do we have to copy current last extent to make space for indirect
1975          * one?
1976          */
1977         if (epos->offset + adsize > sb->s_blocksize) {
1978                 struct kernel_lb_addr cp_loc;
1979                 uint32_t cp_len;
1980                 int cp_type;
1981
1982                 epos->offset -= adsize;
1983                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1984                 cp_len |= ((uint32_t)cp_type) << 30;
1985
1986                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1987                 udf_write_aext(inode, epos, &nepos.block,
1988                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
1989         } else {
1990                 __udf_add_aext(inode, epos, &nepos.block,
1991                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
1992         }
1993
1994         brelse(epos->bh);
1995         *epos = nepos;
1996
1997         return 0;
1998 }
1999
2000 /*
2001  * Append extent at the given position - should be the first free one in inode
2002  * / indirect extent. This function assumes there is enough space in the inode
2003  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2004  */
2005 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2006                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2007 {
2008         struct udf_inode_info *iinfo = UDF_I(inode);
2009         struct allocExtDesc *aed;
2010         int adsize;
2011
2012         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2013                 adsize = sizeof(struct short_ad);
2014         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2015                 adsize = sizeof(struct long_ad);
2016         else
2017                 return -EIO;
2018
2019         if (!epos->bh) {
2020                 WARN_ON(iinfo->i_lenAlloc !=
2021                         epos->offset - udf_file_entry_alloc_offset(inode));
2022         } else {
2023                 aed = (struct allocExtDesc *)epos->bh->b_data;
2024                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2025                         epos->offset - sizeof(struct allocExtDesc));
2026                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2027         }
2028
2029         udf_write_aext(inode, epos, eloc, elen, inc);
2030
2031         if (!epos->bh) {
2032                 iinfo->i_lenAlloc += adsize;
2033                 mark_inode_dirty(inode);
2034         } else {
2035                 aed = (struct allocExtDesc *)epos->bh->b_data;
2036                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2037                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2038                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2039                         udf_update_tag(epos->bh->b_data,
2040                                         epos->offset + (inc ? 0 : adsize));
2041                 else
2042                         udf_update_tag(epos->bh->b_data,
2043                                         sizeof(struct allocExtDesc));
2044                 mark_buffer_dirty_inode(epos->bh, inode);
2045         }
2046
2047         return 0;
2048 }
2049
2050 /*
2051  * Append extent at given position - should be the first free one in inode
2052  * / indirect extent. Takes care of allocating and linking indirect blocks.
2053  */
2054 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2055                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2056 {
2057         int adsize;
2058         struct super_block *sb = inode->i_sb;
2059
2060         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2061                 adsize = sizeof(struct short_ad);
2062         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2063                 adsize = sizeof(struct long_ad);
2064         else
2065                 return -EIO;
2066
2067         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2068                 int err;
2069                 udf_pblk_t new_block;
2070
2071                 new_block = udf_new_block(sb, NULL,
2072                                           epos->block.partitionReferenceNum,
2073                                           epos->block.logicalBlockNum, &err);
2074                 if (!new_block)
2075                         return -ENOSPC;
2076
2077                 err = udf_setup_indirect_aext(inode, new_block, epos);
2078                 if (err)
2079                         return err;
2080         }
2081
2082         return __udf_add_aext(inode, epos, eloc, elen, inc);
2083 }
2084
2085 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2086                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2087 {
2088         int adsize;
2089         uint8_t *ptr;
2090         struct short_ad *sad;
2091         struct long_ad *lad;
2092         struct udf_inode_info *iinfo = UDF_I(inode);
2093
2094         if (!epos->bh)
2095                 ptr = iinfo->i_data + epos->offset -
2096                         udf_file_entry_alloc_offset(inode) +
2097                         iinfo->i_lenEAttr;
2098         else
2099                 ptr = epos->bh->b_data + epos->offset;
2100
2101         switch (iinfo->i_alloc_type) {
2102         case ICBTAG_FLAG_AD_SHORT:
2103                 sad = (struct short_ad *)ptr;
2104                 sad->extLength = cpu_to_le32(elen);
2105                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2106                 adsize = sizeof(struct short_ad);
2107                 break;
2108         case ICBTAG_FLAG_AD_LONG:
2109                 lad = (struct long_ad *)ptr;
2110                 lad->extLength = cpu_to_le32(elen);
2111                 lad->extLocation = cpu_to_lelb(*eloc);
2112                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2113                 adsize = sizeof(struct long_ad);
2114                 break;
2115         default:
2116                 return;
2117         }
2118
2119         if (epos->bh) {
2120                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2121                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2122                         struct allocExtDesc *aed =
2123                                 (struct allocExtDesc *)epos->bh->b_data;
2124                         udf_update_tag(epos->bh->b_data,
2125                                        le32_to_cpu(aed->lengthAllocDescs) +
2126                                        sizeof(struct allocExtDesc));
2127                 }
2128                 mark_buffer_dirty_inode(epos->bh, inode);
2129         } else {
2130                 mark_inode_dirty(inode);
2131         }
2132
2133         if (inc)
2134                 epos->offset += adsize;
2135 }
2136
2137 /*
2138  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2139  * someone does some weird stuff.
2140  */
2141 #define UDF_MAX_INDIR_EXTS 16
2142
2143 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2144                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2145 {
2146         int8_t etype;
2147         unsigned int indirections = 0;
2148
2149         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2150                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2151                 udf_pblk_t block;
2152
2153                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2154                         udf_err(inode->i_sb,
2155                                 "too many indirect extents in inode %lu\n",
2156                                 inode->i_ino);
2157                         return -1;
2158                 }
2159
2160                 epos->block = *eloc;
2161                 epos->offset = sizeof(struct allocExtDesc);
2162                 brelse(epos->bh);
2163                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2164                 epos->bh = udf_tread(inode->i_sb, block);
2165                 if (!epos->bh) {
2166                         udf_debug("reading block %u failed!\n", block);
2167                         return -1;
2168                 }
2169         }
2170
2171         return etype;
2172 }
2173
2174 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2175                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2176 {
2177         int alen;
2178         int8_t etype;
2179         uint8_t *ptr;
2180         struct short_ad *sad;
2181         struct long_ad *lad;
2182         struct udf_inode_info *iinfo = UDF_I(inode);
2183
2184         if (!epos->bh) {
2185                 if (!epos->offset)
2186                         epos->offset = udf_file_entry_alloc_offset(inode);
2187                 ptr = iinfo->i_data + epos->offset -
2188                         udf_file_entry_alloc_offset(inode) +
2189                         iinfo->i_lenEAttr;
2190                 alen = udf_file_entry_alloc_offset(inode) +
2191                                                         iinfo->i_lenAlloc;
2192         } else {
2193                 if (!epos->offset)
2194                         epos->offset = sizeof(struct allocExtDesc);
2195                 ptr = epos->bh->b_data + epos->offset;
2196                 alen = sizeof(struct allocExtDesc) +
2197                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2198                                                         lengthAllocDescs);
2199         }
2200
2201         switch (iinfo->i_alloc_type) {
2202         case ICBTAG_FLAG_AD_SHORT:
2203                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2204                 if (!sad)
2205                         return -1;
2206                 etype = le32_to_cpu(sad->extLength) >> 30;
2207                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2208                 eloc->partitionReferenceNum =
2209                                 iinfo->i_location.partitionReferenceNum;
2210                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2211                 break;
2212         case ICBTAG_FLAG_AD_LONG:
2213                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2214                 if (!lad)
2215                         return -1;
2216                 etype = le32_to_cpu(lad->extLength) >> 30;
2217                 *eloc = lelb_to_cpu(lad->extLocation);
2218                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2219                 break;
2220         default:
2221                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2222                 return -1;
2223         }
2224
2225         return etype;
2226 }
2227
2228 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2229                            struct kernel_lb_addr neloc, uint32_t nelen)
2230 {
2231         struct kernel_lb_addr oeloc;
2232         uint32_t oelen;
2233         int8_t etype;
2234         int err;
2235
2236         if (epos.bh)
2237                 get_bh(epos.bh);
2238
2239         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2240                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2241                 neloc = oeloc;
2242                 nelen = (etype << 30) | oelen;
2243         }
2244         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2245         brelse(epos.bh);
2246
2247         return err;
2248 }
2249
2250 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2251 {
2252         struct extent_position oepos;
2253         int adsize;
2254         int8_t etype;
2255         struct allocExtDesc *aed;
2256         struct udf_inode_info *iinfo;
2257         struct kernel_lb_addr eloc;
2258         uint32_t elen;
2259
2260         if (epos.bh) {
2261                 get_bh(epos.bh);
2262                 get_bh(epos.bh);
2263         }
2264
2265         iinfo = UDF_I(inode);
2266         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2267                 adsize = sizeof(struct short_ad);
2268         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2269                 adsize = sizeof(struct long_ad);
2270         else
2271                 adsize = 0;
2272
2273         oepos = epos;
2274         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2275                 return -1;
2276
2277         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2278                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2279                 if (oepos.bh != epos.bh) {
2280                         oepos.block = epos.block;
2281                         brelse(oepos.bh);
2282                         get_bh(epos.bh);
2283                         oepos.bh = epos.bh;
2284                         oepos.offset = epos.offset - adsize;
2285                 }
2286         }
2287         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2288         elen = 0;
2289
2290         if (epos.bh != oepos.bh) {
2291                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2292                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2293                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2294                 if (!oepos.bh) {
2295                         iinfo->i_lenAlloc -= (adsize * 2);
2296                         mark_inode_dirty(inode);
2297                 } else {
2298                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2299                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2300                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2301                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2302                                 udf_update_tag(oepos.bh->b_data,
2303                                                 oepos.offset - (2 * adsize));
2304                         else
2305                                 udf_update_tag(oepos.bh->b_data,
2306                                                 sizeof(struct allocExtDesc));
2307                         mark_buffer_dirty_inode(oepos.bh, inode);
2308                 }
2309         } else {
2310                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2311                 if (!oepos.bh) {
2312                         iinfo->i_lenAlloc -= adsize;
2313                         mark_inode_dirty(inode);
2314                 } else {
2315                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2316                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2317                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2318                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2319                                 udf_update_tag(oepos.bh->b_data,
2320                                                 epos.offset - adsize);
2321                         else
2322                                 udf_update_tag(oepos.bh->b_data,
2323                                                 sizeof(struct allocExtDesc));
2324                         mark_buffer_dirty_inode(oepos.bh, inode);
2325                 }
2326         }
2327
2328         brelse(epos.bh);
2329         brelse(oepos.bh);
2330
2331         return (elen >> 30);
2332 }
2333
2334 int8_t inode_bmap(struct inode *inode, sector_t block,
2335                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2336                   uint32_t *elen, sector_t *offset)
2337 {
2338         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2339         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2340         int8_t etype;
2341         struct udf_inode_info *iinfo;
2342
2343         iinfo = UDF_I(inode);
2344         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2345                 pos->offset = 0;
2346                 pos->block = iinfo->i_location;
2347                 pos->bh = NULL;
2348         }
2349         *elen = 0;
2350         do {
2351                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2352                 if (etype == -1) {
2353                         *offset = (bcount - lbcount) >> blocksize_bits;
2354                         iinfo->i_lenExtents = lbcount;
2355                         return -1;
2356                 }
2357                 lbcount += *elen;
2358         } while (lbcount <= bcount);
2359         /* update extent cache */
2360         udf_update_extent_cache(inode, lbcount - *elen, pos);
2361         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2362
2363         return etype;
2364 }
2365
2366 udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
2367 {
2368         struct kernel_lb_addr eloc;
2369         uint32_t elen;
2370         sector_t offset;
2371         struct extent_position epos = {};
2372         udf_pblk_t ret;
2373
2374         down_read(&UDF_I(inode)->i_data_sem);
2375
2376         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2377                                                 (EXT_RECORDED_ALLOCATED >> 30))
2378                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2379         else
2380                 ret = 0;
2381
2382         up_read(&UDF_I(inode)->i_data_sem);
2383         brelse(epos.bh);
2384
2385         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2386                 return udf_fixed_to_variable(ret);
2387         else
2388                 return ret;
2389 }