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
  42 #include "udf_i.h"
  43 #include "udf_sb.h"
  44
  45 MODULE_AUTHOR("Ben Fennema");
  46 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
  47 MODULE_LICENSE("GPL");
  48
  49 #define EXTENT_MERGE_SIZE 5
  50
  51 static umode_t udf_convert_permissions(struct fileEntry *);
  52 static int udf_update_inode(struct inode *, int);
  53 static int udf_sync_inode(struct inode *inode);
  54 static int udf_alloc_i_data(struct inode *inode, size_t size);
  55 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  56 static int8_t udf_insert_aext(struct inode *, struct extent_position,
  57                               struct kernel_lb_addr, uint32_t);
  58 static void udf_split_extents(struct inode *, int *, int, int,
  59                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  60 static void udf_prealloc_extents(struct inode *, int, int,
  61                                  struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  62 static void udf_merge_extents(struct inode *,
  63                               struct kernel_long_ad[EXTENT_MERGE_SIZE], int *);
  64 static void udf_update_extents(struct inode *,
  65                                struct kernel_long_ad[EXTENT_MERGE_SIZE], int, int,
  66                                struct extent_position *);
  67 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  68
  69 static void __udf_clear_extent_cache(struct inode *inode)
  70 {
  71         struct udf_inode_info *iinfo = UDF_I(inode);
  72
  73         if (iinfo->cached_extent.lstart != -1) {
  74                 brelse(iinfo->cached_extent.epos.bh);
  75                 iinfo->cached_extent.lstart = -1;
  76         }
  77 }
  78
  79 /* Invalidate extent cache */
  80 static void udf_clear_extent_cache(struct inode *inode)
  81 {
  82         struct udf_inode_info *iinfo = UDF_I(inode);
  83
  84         spin_lock(&iinfo->i_extent_cache_lock);
  85         __udf_clear_extent_cache(inode);
  86         spin_unlock(&iinfo->i_extent_cache_lock);
  87 }
  88
  89 /* Return contents of extent cache */
  90 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  91                                  loff_t *lbcount, struct extent_position *pos)
  92 {
  93         struct udf_inode_info *iinfo = UDF_I(inode);
  94         int ret = 0;
  95
  96         spin_lock(&iinfo->i_extent_cache_lock);
  97         if ((iinfo->cached_extent.lstart <= bcount) &&
  98             (iinfo->cached_extent.lstart != -1)) {
  99                 /* Cache hit */
 100                 *lbcount = iinfo->cached_extent.lstart;
 101                 memcpy(pos, &iinfo->cached_extent.epos,
 102                        sizeof(struct extent_position));
 103                 if (pos->bh)
 104                         get_bh(pos->bh);
 105                 ret = 1;
 106         }
 107         spin_unlock(&iinfo->i_extent_cache_lock);
 108         return ret;
 109 }
 110
 111 /* Add extent to extent cache */
 112 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 113                                     struct extent_position *pos, int next_epos)
 114 {
 115         struct udf_inode_info *iinfo = UDF_I(inode);
 116
 117         spin_lock(&iinfo->i_extent_cache_lock);
 118         /* Invalidate previously cached extent */
 119         __udf_clear_extent_cache(inode);
 120         if (pos->bh)
 121                 get_bh(pos->bh);
 122         memcpy(&iinfo->cached_extent.epos, pos,
 123                sizeof(struct extent_position));
 124         iinfo->cached_extent.lstart = estart;
 125         if (next_epos)
 126                 switch (iinfo->i_alloc_type) {
 127                 case ICBTAG_FLAG_AD_SHORT:
 128                         iinfo->cached_extent.epos.offset -=
 129                         sizeof(struct short_ad);
 130                         break;
 131                 case ICBTAG_FLAG_AD_LONG:
 132                         iinfo->cached_extent.epos.offset -=
 133                         sizeof(struct long_ad);
 134                 }
 135         spin_unlock(&iinfo->i_extent_cache_lock);
 136 }
 137
 138 void udf_evict_inode(struct inode *inode)
 139 {
 140         struct udf_inode_info *iinfo = UDF_I(inode);
 141         int want_delete = 0;
 142
 143         if (!is_bad_inode(inode)) {
 144                 if (!inode->i_nlink) {
 145                         want_delete = 1;
 146                         udf_setsize(inode, 0);
 147                         udf_update_inode(inode, IS_SYNC(inode));
 148                 }
 149                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 150                     inode->i_size != iinfo->i_lenExtents) {
 151                         udf_warn(inode->i_sb,
 152                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 153                                  inode->i_ino, inode->i_mode,
 154                                  (unsigned long long)inode->i_size,
 155                                  (unsigned long long)iinfo->i_lenExtents);
 156                 }
 157         }
 158         truncate_inode_pages_final(&inode->i_data);
 159         invalidate_inode_buffers(inode);
 160         clear_inode(inode);
 161         kfree(iinfo->i_ext.i_data);
 162         iinfo->i_ext.i_data = NULL;
 163         udf_clear_extent_cache(inode);
 164         if (want_delete) {
 165                 udf_free_inode(inode);
 166         }
 167 }
 168
 169 static void udf_write_failed(struct address_space *mapping, loff_t to)
 170 {
 171         struct inode *inode = mapping->host;
 172         struct udf_inode_info *iinfo = UDF_I(inode);
 173         loff_t isize = inode->i_size;
 174
 175         if (to > isize) {
 176                 truncate_pagecache(inode, isize);
 177                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 178                         down_write(&iinfo->i_data_sem);
 179                         udf_clear_extent_cache(inode);
 180                         udf_truncate_extents(inode);
 181                         up_write(&iinfo->i_data_sem);
 182                 }
 183         }
 184 }
 185
 186 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 187 {
 188         return block_write_full_page(page, udf_get_block, wbc);
 189 }
 190
 191 static int udf_writepages(struct address_space *mapping,
 192                         struct writeback_control *wbc)
 193 {
 194         return mpage_writepages(mapping, wbc, udf_get_block);
 195 }
 196
 197 static int udf_readpage(struct file *file, struct page *page)
 198 {
 199         return mpage_readpage(page, udf_get_block);
 200 }
 201
 202 static int udf_readpages(struct file *file, struct address_space *mapping,
 203                         struct list_head *pages, unsigned nr_pages)
 204 {
 205         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 206 }
 207
 208 static int udf_write_begin(struct file *file, struct address_space *mapping,
 209                         loff_t pos, unsigned len, unsigned flags,
 210                         struct page **pagep, void **fsdata)
 211 {
 212         int ret;
 213
 214         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 215         if (unlikely(ret))
 216                 udf_write_failed(mapping, pos + len);
 217         return ret;
 218 }
 219
 220 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 221 {
 222         struct file *file = iocb->ki_filp;
 223         struct address_space *mapping = file->f_mapping;
 224         struct inode *inode = mapping->host;
 225         size_t count = iov_iter_count(iter);
 226         ssize_t ret;
 227
 228         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 229         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 230                 udf_write_failed(mapping, iocb->ki_pos + count);
 231         return ret;
 232 }
 233
 234 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 235 {
 236         return generic_block_bmap(mapping, block, udf_get_block);
 237 }
 238
 239 const struct address_space_operations udf_aops = {
 240         .readpage       = udf_readpage,
 241         .readpages      = udf_readpages,
 242         .writepage      = udf_writepage,
 243         .writepages     = udf_writepages,
 244         .write_begin    = udf_write_begin,
 245         .write_end      = generic_write_end,
 246         .direct_IO      = udf_direct_IO,
 247         .bmap           = udf_bmap,
 248 };
 249
 250 /*
 251  * Expand file stored in ICB to a normal one-block-file
 252  *
 253  * This function requires i_data_sem for writing and releases it.
 254  * This function requires i_mutex held
 255  */
 256 int udf_expand_file_adinicb(struct inode *inode)
 257 {
 258         struct page *page;
 259         char *kaddr;
 260         struct udf_inode_info *iinfo = UDF_I(inode);
 261         int err;
 262
 263         WARN_ON_ONCE(!inode_is_locked(inode));
 264         if (!iinfo->i_lenAlloc) {
 265                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 266                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 267                 else
 268                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 269                 /* from now on we have normal address_space methods */
 270                 inode->i_data.a_ops = &udf_aops;
 271                 up_write(&iinfo->i_data_sem);
 272                 mark_inode_dirty(inode);
 273                 return 0;
 274         }
 275         /*
 276          * Release i_data_sem so that we can lock a page - page lock ranks
 277          * above i_data_sem. i_mutex still protects us against file changes.
 278          */
 279         up_write(&iinfo->i_data_sem);
 280
 281         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 282         if (!page)
 283                 return -ENOMEM;
 284
 285         if (!PageUptodate(page)) {
 286                 kaddr = kmap(page);
 287                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 288                        PAGE_SIZE - iinfo->i_lenAlloc);
 289                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 290                         iinfo->i_lenAlloc);
 291                 flush_dcache_page(page);
 292                 SetPageUptodate(page);
 293                 kunmap(page);
 294         }
 295         down_write(&iinfo->i_data_sem);
 296         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 297                iinfo->i_lenAlloc);
 298         iinfo->i_lenAlloc = 0;
 299         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 300                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 301         else
 302                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 303         /* from now on we have normal address_space methods */
 304         inode->i_data.a_ops = &udf_aops;
 305         set_page_dirty(page);
 306         unlock_page(page);
 307         up_write(&iinfo->i_data_sem);
 308         err = filemap_fdatawrite(inode->i_mapping);
 309         if (err) {
 310                 /* Restore everything back so that we don't lose data... */
 311                 lock_page(page);
 312                 kaddr = kmap(page);
 313                 down_write(&iinfo->i_data_sem);
 314                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 315                        inode->i_size);
 316                 kunmap(page);
 317                 unlock_page(page);
 318                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 319                 inode->i_data.a_ops = &udf_adinicb_aops;
 320                 iinfo->i_lenAlloc = inode->i_size;
 321                 up_write(&iinfo->i_data_sem);
 322         }
 323         put_page(page);
 324         mark_inode_dirty(inode);
 325
 326         return err;
 327 }
 328
 329 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, int *block,
 330                                            int *err)
 331 {
 332         int newblock;
 333         struct buffer_head *dbh = NULL;
 334         struct kernel_lb_addr eloc;
 335         uint8_t alloctype;
 336         struct extent_position epos;
 337
 338         struct udf_fileident_bh sfibh, dfibh;
 339         loff_t f_pos = udf_ext0_offset(inode);
 340         int size = udf_ext0_offset(inode) + inode->i_size;
 341         struct fileIdentDesc cfi, *sfi, *dfi;
 342         struct udf_inode_info *iinfo = UDF_I(inode);
 343
 344         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 345                 alloctype = ICBTAG_FLAG_AD_SHORT;
 346         else
 347                 alloctype = ICBTAG_FLAG_AD_LONG;
 348
 349         if (!inode->i_size) {
 350                 iinfo->i_alloc_type = alloctype;
 351                 mark_inode_dirty(inode);
 352                 return NULL;
 353         }
 354
 355         /* alloc block, and copy data to it */
 356         *block = udf_new_block(inode->i_sb, inode,
 357                                iinfo->i_location.partitionReferenceNum,
 358                                iinfo->i_location.logicalBlockNum, err);
 359         if (!(*block))
 360                 return NULL;
 361         newblock = udf_get_pblock(inode->i_sb, *block,
 362                                   iinfo->i_location.partitionReferenceNum,
 363                                 0);
 364         if (!newblock)
 365                 return NULL;
 366         dbh = udf_tgetblk(inode->i_sb, newblock);
 367         if (!dbh)
 368                 return NULL;
 369         lock_buffer(dbh);
 370         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 371         set_buffer_uptodate(dbh);
 372         unlock_buffer(dbh);
 373         mark_buffer_dirty_inode(dbh, inode);
 374
 375         sfibh.soffset = sfibh.eoffset =
 376                         f_pos & (inode->i_sb->s_blocksize - 1);
 377         sfibh.sbh = sfibh.ebh = NULL;
 378         dfibh.soffset = dfibh.eoffset = 0;
 379         dfibh.sbh = dfibh.ebh = dbh;
 380         while (f_pos < size) {
 381                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 382                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 383                                          NULL, NULL, NULL);
 384                 if (!sfi) {
 385                         brelse(dbh);
 386                         return NULL;
 387                 }
 388                 iinfo->i_alloc_type = alloctype;
 389                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 390                 dfibh.soffset = dfibh.eoffset;
 391                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 392                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 393                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 394                                  sfi->fileIdent +
 395                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 396                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 397                         brelse(dbh);
 398                         return NULL;
 399                 }
 400         }
 401         mark_buffer_dirty_inode(dbh, inode);
 402
 403         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 404                 iinfo->i_lenAlloc);
 405         iinfo->i_lenAlloc = 0;
 406         eloc.logicalBlockNum = *block;
 407         eloc.partitionReferenceNum =
 408                                 iinfo->i_location.partitionReferenceNum;
 409         iinfo->i_lenExtents = inode->i_size;
 410         epos.bh = NULL;
 411         epos.block = iinfo->i_location;
 412         epos.offset = udf_file_entry_alloc_offset(inode);
 413         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 414         /* UniqueID stuff */
 415
 416         brelse(epos.bh);
 417         mark_inode_dirty(inode);
 418         return dbh;
 419 }
 420
 421 static int udf_get_block(struct inode *inode, sector_t block,
 422                          struct buffer_head *bh_result, int create)
 423 {
 424         int err, new;
 425         sector_t phys = 0;
 426         struct udf_inode_info *iinfo;
 427
 428         if (!create) {
 429                 phys = udf_block_map(inode, block);
 430                 if (phys)
 431                         map_bh(bh_result, inode->i_sb, phys);
 432                 return 0;
 433         }
 434
 435         err = -EIO;
 436         new = 0;
 437         iinfo = UDF_I(inode);
 438
 439         down_write(&iinfo->i_data_sem);
 440         if (block == iinfo->i_next_alloc_block + 1) {
 441                 iinfo->i_next_alloc_block++;
 442                 iinfo->i_next_alloc_goal++;
 443         }
 444
 445         udf_clear_extent_cache(inode);
 446         phys = inode_getblk(inode, block, &err, &new);
 447         if (!phys)
 448                 goto abort;
 449
 450         if (new)
 451                 set_buffer_new(bh_result);
 452         map_bh(bh_result, inode->i_sb, phys);
 453
 454 abort:
 455         up_write(&iinfo->i_data_sem);
 456         return err;
 457 }
 458
 459 static struct buffer_head *udf_getblk(struct inode *inode, long block,
 460                                       int create, int *err)
 461 {
 462         struct buffer_head *bh;
 463         struct buffer_head dummy;
 464
 465         dummy.b_state = 0;
 466         dummy.b_blocknr = -1000;
 467         *err = udf_get_block(inode, block, &dummy, create);
 468         if (!*err && buffer_mapped(&dummy)) {
 469                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 470                 if (buffer_new(&dummy)) {
 471                         lock_buffer(bh);
 472                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 473                         set_buffer_uptodate(bh);
 474                         unlock_buffer(bh);
 475                         mark_buffer_dirty_inode(bh, inode);
 476                 }
 477                 return bh;
 478         }
 479
 480         return NULL;
 481 }
 482
 483 /* Extend the file with new blocks totaling 'new_block_bytes',
 484  * return the number of extents added
 485  */
 486 static int udf_do_extend_file(struct inode *inode,
 487                               struct extent_position *last_pos,
 488                               struct kernel_long_ad *last_ext,
 489                               loff_t new_block_bytes)
 490 {
 491         uint32_t add;
 492         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 493         struct super_block *sb = inode->i_sb;
 494         struct kernel_lb_addr prealloc_loc = {};
 495         int prealloc_len = 0;
 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         /* Last extent are just preallocated blocks? */
 517         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 518                                                 EXT_NOT_RECORDED_ALLOCATED) {
 519                 /* Save the extent so that we can reattach it to the end */
 520                 prealloc_loc = last_ext->extLocation;
 521                 prealloc_len = last_ext->extLength;
 522                 /* Mark the extent as a hole */
 523                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 524                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 525                 last_ext->extLocation.logicalBlockNum = 0;
 526                 last_ext->extLocation.partitionReferenceNum = 0;
 527         }
 528
 529         /* Can we merge with the previous extent? */
 530         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 531                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 532                 add = (1 << 30) - sb->s_blocksize -
 533                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 534                 if (add > new_block_bytes)
 535                         add = new_block_bytes;
 536                 new_block_bytes -= add;
 537                 last_ext->extLength += add;
 538         }
 539
 540         if (fake) {
 541                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 542                              last_ext->extLength, 1);
 543                 count++;
 544         } else {
 545                 struct kernel_lb_addr tmploc;
 546                 uint32_t tmplen;
 547
 548                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 549                                 last_ext->extLength, 1);
 550
 551                 /*
 552                  * We've rewritten the last extent. If we are going to add
 553                  * more extents, we may need to enter possible following
 554                  * empty indirect extent.
 555                  */
 556                 if (new_block_bytes || prealloc_len)
 557                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 558         }
 559
 560         /* Managed to do everything necessary? */
 561         if (!new_block_bytes)
 562                 goto out;
 563
 564         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 565         last_ext->extLocation.logicalBlockNum = 0;
 566         last_ext->extLocation.partitionReferenceNum = 0;
 567         add = (1 << 30) - sb->s_blocksize;
 568         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 569
 570         /* Create enough extents to cover the whole hole */
 571         while (new_block_bytes > add) {
 572                 new_block_bytes -= add;
 573                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 574                                    last_ext->extLength, 1);
 575                 if (err)
 576                         return err;
 577                 count++;
 578         }
 579         if (new_block_bytes) {
 580                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 581                         new_block_bytes;
 582                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 583                                    last_ext->extLength, 1);
 584                 if (err)
 585                         return err;
 586                 count++;
 587         }
 588
 589 out:
 590         /* Do we have some preallocated blocks saved? */
 591         if (prealloc_len) {
 592                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 593                                    prealloc_len, 1);
 594                 if (err)
 595                         return err;
 596                 last_ext->extLocation = prealloc_loc;
 597                 last_ext->extLength = prealloc_len;
 598                 count++;
 599         }
 600
 601         /* last_pos should point to the last written extent... */
 602         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 603                 last_pos->offset -= sizeof(struct short_ad);
 604         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 605                 last_pos->offset -= sizeof(struct long_ad);
 606         else
 607                 return -EIO;
 608
 609         return count;
 610 }
 611
 612 /* Extend the final block of the file to final_block_len bytes */
 613 static void udf_do_extend_final_block(struct inode *inode,
 614                                       struct extent_position *last_pos,
 615                                       struct kernel_long_ad *last_ext,
 616                                       uint32_t final_block_len)
 617 {
 618         struct super_block *sb = inode->i_sb;
 619         uint32_t added_bytes;
 620
 621         added_bytes = final_block_len -
 622                       (last_ext->extLength & (sb->s_blocksize - 1));
 623         last_ext->extLength += added_bytes;
 624         UDF_I(inode)->i_lenExtents += added_bytes;
 625
 626         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 627                         last_ext->extLength, 1);
 628 }
 629
 630 static int udf_extend_file(struct inode *inode, loff_t newsize)
 631 {
 632
 633         struct extent_position epos;
 634         struct kernel_lb_addr eloc;
 635         uint32_t elen;
 636         int8_t etype;
 637         struct super_block *sb = inode->i_sb;
 638         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 639         unsigned long partial_final_block;
 640         int adsize;
 641         struct udf_inode_info *iinfo = UDF_I(inode);
 642         struct kernel_long_ad extent;
 643         int err = 0;
 644         int within_final_block;
 645
 646         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 647                 adsize = sizeof(struct short_ad);
 648         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 649                 adsize = sizeof(struct long_ad);
 650         else
 651                 BUG();
 652
 653         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 654         within_final_block = (etype != -1);
 655
 656         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 657             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 658                 /* File has no extents at all or has empty last
 659                  * indirect extent! Create a fake extent... */
 660                 extent.extLocation.logicalBlockNum = 0;
 661                 extent.extLocation.partitionReferenceNum = 0;
 662                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 663         } else {
 664                 epos.offset -= adsize;
 665                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 666                                       &extent.extLength, 0);
 667                 extent.extLength |= etype << 30;
 668         }
 669
 670         partial_final_block = newsize & (sb->s_blocksize - 1);
 671
 672         /* File has extent covering the new size (could happen when extending
 673          * inside a block)?
 674          */
 675         if (within_final_block) {
 676                 /* Extending file within the last file block */
 677                 udf_do_extend_final_block(inode, &epos, &extent,
 678                                           partial_final_block);
 679         } else {
 680                 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
 681                              partial_final_block;
 682                 err = udf_do_extend_file(inode, &epos, &extent, add);
 683         }
 684
 685         if (err < 0)
 686                 goto out;
 687         err = 0;
 688         iinfo->i_lenExtents = newsize;
 689 out:
 690         brelse(epos.bh);
 691         return err;
 692 }
 693
 694 static sector_t inode_getblk(struct inode *inode, sector_t block,
 695                              int *err, int *new)
 696 {
 697         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 698         struct extent_position prev_epos, cur_epos, next_epos;
 699         int count = 0, startnum = 0, endnum = 0;
 700         uint32_t elen = 0, tmpelen;
 701         struct kernel_lb_addr eloc, tmpeloc;
 702         int c = 1;
 703         loff_t lbcount = 0, b_off = 0;
 704         uint32_t newblocknum, newblock;
 705         sector_t offset = 0;
 706         int8_t etype;
 707         struct udf_inode_info *iinfo = UDF_I(inode);
 708         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 709         int lastblock = 0;
 710         bool isBeyondEOF;
 711
 712         *err = 0;
 713         *new = 0;
 714         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 715         prev_epos.block = iinfo->i_location;
 716         prev_epos.bh = NULL;
 717         cur_epos = next_epos = prev_epos;
 718         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 719
 720         /* find the extent which contains the block we are looking for.
 721            alternate between laarr[0] and laarr[1] for locations of the
 722            current extent, and the previous extent */
 723         do {
 724                 if (prev_epos.bh != cur_epos.bh) {
 725                         brelse(prev_epos.bh);
 726                         get_bh(cur_epos.bh);
 727                         prev_epos.bh = cur_epos.bh;
 728                 }
 729                 if (cur_epos.bh != next_epos.bh) {
 730                         brelse(cur_epos.bh);
 731                         get_bh(next_epos.bh);
 732                         cur_epos.bh = next_epos.bh;
 733                 }
 734
 735                 lbcount += elen;
 736
 737                 prev_epos.block = cur_epos.block;
 738                 cur_epos.block = next_epos.block;
 739
 740                 prev_epos.offset = cur_epos.offset;
 741                 cur_epos.offset = next_epos.offset;
 742
 743                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 744                 if (etype == -1)
 745                         break;
 746
 747                 c = !c;
 748
 749                 laarr[c].extLength = (etype << 30) | elen;
 750                 laarr[c].extLocation = eloc;
 751
 752                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 753                         pgoal = eloc.logicalBlockNum +
 754                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 755                                  inode->i_sb->s_blocksize_bits);
 756
 757                 count++;
 758         } while (lbcount + elen <= b_off);
 759
 760         b_off -= lbcount;
 761         offset = b_off >> inode->i_sb->s_blocksize_bits;
 762         /*
 763          * Move prev_epos and cur_epos into indirect extent if we are at
 764          * the pointer to it
 765          */
 766         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 767         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 768
 769         /* if the extent is allocated and recorded, return the block
 770            if the extent is not a multiple of the blocksize, round up */
 771
 772         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 773                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 774                         elen = EXT_RECORDED_ALLOCATED |
 775                                 ((elen + inode->i_sb->s_blocksize - 1) &
 776                                  ~(inode->i_sb->s_blocksize - 1));
 777                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 778                 }
 779                 brelse(prev_epos.bh);
 780                 brelse(cur_epos.bh);
 781                 brelse(next_epos.bh);
 782                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 783                 return newblock;
 784         }
 785
 786         /* Are we beyond EOF? */
 787         if (etype == -1) {
 788                 int ret;
 789                 loff_t hole_len;
 790                 isBeyondEOF = true;
 791                 if (count) {
 792                         if (c)
 793                                 laarr[0] = laarr[1];
 794                         startnum = 1;
 795                 } else {
 796                         /* Create a fake extent when there's not one */
 797                         memset(&laarr[0].extLocation, 0x00,
 798                                 sizeof(struct kernel_lb_addr));
 799                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 800                         /* Will udf_do_extend_file() create real extent from
 801                            a fake one? */
 802                         startnum = (offset > 0);
 803                 }
 804                 /* Create extents for the hole between EOF and offset */
 805                 hole_len = (loff_t)offset << inode->i_blkbits;
 806                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 807                 if (ret < 0) {
 808                         brelse(prev_epos.bh);
 809                         brelse(cur_epos.bh);
 810                         brelse(next_epos.bh);
 811                         *err = ret;
 812                         return 0;
 813                 }
 814                 c = 0;
 815                 offset = 0;
 816                 count += ret;
 817                 /* We are not covered by a preallocated extent? */
 818                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 819                                                 EXT_NOT_RECORDED_ALLOCATED) {
 820                         /* Is there any real extent? - otherwise we overwrite
 821                          * the fake one... */
 822                         if (count)
 823                                 c = !c;
 824                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 825                                 inode->i_sb->s_blocksize;
 826                         memset(&laarr[c].extLocation, 0x00,
 827                                 sizeof(struct kernel_lb_addr));
 828                         count++;
 829                 }
 830                 endnum = c + 1;
 831                 lastblock = 1;
 832         } else {
 833                 isBeyondEOF = false;
 834                 endnum = startnum = ((count > 2) ? 2 : count);
 835
 836                 /* if the current extent is in position 0,
 837                    swap it with the previous */
 838                 if (!c && count != 1) {
 839                         laarr[2] = laarr[0];
 840                         laarr[0] = laarr[1];
 841                         laarr[1] = laarr[2];
 842                         c = 1;
 843                 }
 844
 845                 /* if the current block is located in an extent,
 846                    read the next extent */
 847                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 848                 if (etype != -1) {
 849                         laarr[c + 1].extLength = (etype << 30) | elen;
 850                         laarr[c + 1].extLocation = eloc;
 851                         count++;
 852                         startnum++;
 853                         endnum++;
 854                 } else
 855                         lastblock = 1;
 856         }
 857
 858         /* if the current extent is not recorded but allocated, get the
 859          * block in the extent corresponding to the requested block */
 860         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 861                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 862         else { /* otherwise, allocate a new block */
 863                 if (iinfo->i_next_alloc_block == block)
 864                         goal = iinfo->i_next_alloc_goal;
 865
 866                 if (!goal) {
 867                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 868                                 goal = iinfo->i_location.logicalBlockNum + 1;
 869                 }
 870
 871                 newblocknum = udf_new_block(inode->i_sb, inode,
 872                                 iinfo->i_location.partitionReferenceNum,
 873                                 goal, err);
 874                 if (!newblocknum) {
 875                         brelse(prev_epos.bh);
 876                         brelse(cur_epos.bh);
 877                         brelse(next_epos.bh);
 878                         *err = -ENOSPC;
 879                         return 0;
 880                 }
 881                 if (isBeyondEOF)
 882                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 883         }
 884
 885         /* if the extent the requsted block is located in contains multiple
 886          * blocks, split the extent into at most three extents. blocks prior
 887          * to requested block, requested block, and blocks after requested
 888          * block */
 889         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 890
 891 #ifdef UDF_PREALLOCATE
 892         /* We preallocate blocks only for regular files. It also makes sense
 893          * for directories but there's a problem when to drop the
 894          * preallocation. We might use some delayed work for that but I feel
 895          * it's overengineering for a filesystem like UDF. */
 896         if (S_ISREG(inode->i_mode))
 897                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 898 #endif
 899
 900         /* merge any continuous blocks in laarr */
 901         udf_merge_extents(inode, laarr, &endnum);
 902
 903         /* write back the new extents, inserting new extents if the new number
 904          * of extents is greater than the old number, and deleting extents if
 905          * the new number of extents is less than the old number */
 906         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 907
 908         brelse(prev_epos.bh);
 909         brelse(cur_epos.bh);
 910         brelse(next_epos.bh);
 911
 912         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 913                                 iinfo->i_location.partitionReferenceNum, 0);
 914         if (!newblock) {
 915                 *err = -EIO;
 916                 return 0;
 917         }
 918         *new = 1;
 919         iinfo->i_next_alloc_block = block;
 920         iinfo->i_next_alloc_goal = newblocknum;
 921         inode->i_ctime = current_time(inode);
 922
 923         if (IS_SYNC(inode))
 924                 udf_sync_inode(inode);
 925         else
 926                 mark_inode_dirty(inode);
 927
 928         return newblock;
 929 }
 930
 931 static void udf_split_extents(struct inode *inode, int *c, int offset,
 932                               int newblocknum,
 933                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 934                               int *endnum)
 935 {
 936         unsigned long blocksize = inode->i_sb->s_blocksize;
 937         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 938
 939         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 940             (laarr[*c].extLength >> 30) ==
 941                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 942                 int curr = *c;
 943                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 944                             blocksize - 1) >> blocksize_bits;
 945                 int8_t etype = (laarr[curr].extLength >> 30);
 946
 947                 if (blen == 1)
 948                         ;
 949                 else if (!offset || blen == offset + 1) {
 950                         laarr[curr + 2] = laarr[curr + 1];
 951                         laarr[curr + 1] = laarr[curr];
 952                 } else {
 953                         laarr[curr + 3] = laarr[curr + 1];
 954                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 955                 }
 956
 957                 if (offset) {
 958                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 959                                 udf_free_blocks(inode->i_sb, inode,
 960                                                 &laarr[curr].extLocation,
 961                                                 0, offset);
 962                                 laarr[curr].extLength =
 963                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 964                                         (offset << blocksize_bits);
 965                                 laarr[curr].extLocation.logicalBlockNum = 0;
 966                                 laarr[curr].extLocation.
 967                                                 partitionReferenceNum = 0;
 968                         } else
 969                                 laarr[curr].extLength = (etype << 30) |
 970                                         (offset << blocksize_bits);
 971                         curr++;
 972                         (*c)++;
 973                         (*endnum)++;
 974                 }
 975
 976                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 977                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 978                         laarr[curr].extLocation.partitionReferenceNum =
 979                                 UDF_I(inode)->i_location.partitionReferenceNum;
 980                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 981                         blocksize;
 982                 curr++;
 983
 984                 if (blen != offset + 1) {
 985                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 986                                 laarr[curr].extLocation.logicalBlockNum +=
 987                                                                 offset + 1;
 988                         laarr[curr].extLength = (etype << 30) |
 989                                 ((blen - (offset + 1)) << blocksize_bits);
 990                         curr++;
 991                         (*endnum)++;
 992                 }
 993         }
 994 }
 995
 996 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 997                                  struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
 998                                  int *endnum)
 999 {
1000         int start, length = 0, currlength = 0, i;
1001
1002         if (*endnum >= (c + 1)) {
1003                 if (!lastblock)
1004                         return;
1005                 else
1006                         start = c;
1007         } else {
1008                 if ((laarr[c + 1].extLength >> 30) ==
1009                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1010                         start = c + 1;
1011                         length = currlength =
1012                                 (((laarr[c + 1].extLength &
1013                                         UDF_EXTENT_LENGTH_MASK) +
1014                                 inode->i_sb->s_blocksize - 1) >>
1015                                 inode->i_sb->s_blocksize_bits);
1016                 } else
1017                         start = c;
1018         }
1019
1020         for (i = start + 1; i <= *endnum; i++) {
1021                 if (i == *endnum) {
1022                         if (lastblock)
1023                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1024                 } else if ((laarr[i].extLength >> 30) ==
1025                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1026                         length += (((laarr[i].extLength &
1027                                                 UDF_EXTENT_LENGTH_MASK) +
1028                                     inode->i_sb->s_blocksize - 1) >>
1029                                     inode->i_sb->s_blocksize_bits);
1030                 } else
1031                         break;
1032         }
1033
1034         if (length) {
1035                 int next = laarr[start].extLocation.logicalBlockNum +
1036                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1037                           inode->i_sb->s_blocksize - 1) >>
1038                           inode->i_sb->s_blocksize_bits);
1039                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1040                                 laarr[start].extLocation.partitionReferenceNum,
1041                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1042                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1043                                 currlength);
1044                 if (numalloc)   {
1045                         if (start == (c + 1))
1046                                 laarr[start].extLength +=
1047                                         (numalloc <<
1048                                          inode->i_sb->s_blocksize_bits);
1049                         else {
1050                                 memmove(&laarr[c + 2], &laarr[c + 1],
1051                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1052                                 (*endnum)++;
1053                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1054                                 laarr[c + 1].extLocation.partitionReferenceNum =
1055                                         laarr[c].extLocation.
1056                                                         partitionReferenceNum;
1057                                 laarr[c + 1].extLength =
1058                                         EXT_NOT_RECORDED_ALLOCATED |
1059                                         (numalloc <<
1060                                          inode->i_sb->s_blocksize_bits);
1061                                 start = c + 1;
1062                         }
1063
1064                         for (i = start + 1; numalloc && i < *endnum; i++) {
1065                                 int elen = ((laarr[i].extLength &
1066                                                 UDF_EXTENT_LENGTH_MASK) +
1067                                             inode->i_sb->s_blocksize - 1) >>
1068                                             inode->i_sb->s_blocksize_bits;
1069
1070                                 if (elen > numalloc) {
1071                                         laarr[i].extLength -=
1072                                                 (numalloc <<
1073                                                  inode->i_sb->s_blocksize_bits);
1074                                         numalloc = 0;
1075                                 } else {
1076                                         numalloc -= elen;
1077                                         if (*endnum > (i + 1))
1078                                                 memmove(&laarr[i],
1079                                                         &laarr[i + 1],
1080                                                         sizeof(struct long_ad) *
1081                                                         (*endnum - (i + 1)));
1082                                         i--;
1083                                         (*endnum)--;
1084                                 }
1085                         }
1086                         UDF_I(inode)->i_lenExtents +=
1087                                 numalloc << inode->i_sb->s_blocksize_bits;
1088                 }
1089         }
1090 }
1091
1092 static void udf_merge_extents(struct inode *inode,
1093                               struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1094                               int *endnum)
1095 {
1096         int i;
1097         unsigned long blocksize = inode->i_sb->s_blocksize;
1098         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1099
1100         for (i = 0; i < (*endnum - 1); i++) {
1101                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1102                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1103
1104                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1105                         (((li->extLength >> 30) ==
1106                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1107                         ((lip1->extLocation.logicalBlockNum -
1108                           li->extLocation.logicalBlockNum) ==
1109                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1110                         blocksize - 1) >> blocksize_bits)))) {
1111
1112                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1113                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1114                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1115                                 lip1->extLength = (lip1->extLength -
1116                                                   (li->extLength &
1117                                                    UDF_EXTENT_LENGTH_MASK) +
1118                                                    UDF_EXTENT_LENGTH_MASK) &
1119                                                         ~(blocksize - 1);
1120                                 li->extLength = (li->extLength &
1121                                                  UDF_EXTENT_FLAG_MASK) +
1122                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1123                                                 blocksize;
1124                                 lip1->extLocation.logicalBlockNum =
1125                                         li->extLocation.logicalBlockNum +
1126                                         ((li->extLength &
1127                                                 UDF_EXTENT_LENGTH_MASK) >>
1128                                                 blocksize_bits);
1129                         } else {
1130                                 li->extLength = lip1->extLength +
1131                                         (((li->extLength &
1132                                                 UDF_EXTENT_LENGTH_MASK) +
1133                                          blocksize - 1) & ~(blocksize - 1));
1134                                 if (*endnum > (i + 2))
1135                                         memmove(&laarr[i + 1], &laarr[i + 2],
1136                                                 sizeof(struct long_ad) *
1137                                                 (*endnum - (i + 2)));
1138                                 i--;
1139                                 (*endnum)--;
1140                         }
1141                 } else if (((li->extLength >> 30) ==
1142                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1143                            ((lip1->extLength >> 30) ==
1144                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1145                         udf_free_blocks(inode->i_sb, inode, &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
1152                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1153                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1154                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1155                                 lip1->extLength = (lip1->extLength -
1156                                                    (li->extLength &
1157                                                    UDF_EXTENT_LENGTH_MASK) +
1158                                                    UDF_EXTENT_LENGTH_MASK) &
1159                                                    ~(blocksize - 1);
1160                                 li->extLength = (li->extLength &
1161                                                  UDF_EXTENT_FLAG_MASK) +
1162                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1163                                                 blocksize;
1164                         } else {
1165                                 li->extLength = lip1->extLength +
1166                                         (((li->extLength &
1167                                                 UDF_EXTENT_LENGTH_MASK) +
1168                                           blocksize - 1) & ~(blocksize - 1));
1169                                 if (*endnum > (i + 2))
1170                                         memmove(&laarr[i + 1], &laarr[i + 2],
1171                                                 sizeof(struct long_ad) *
1172                                                 (*endnum - (i + 2)));
1173                                 i--;
1174                                 (*endnum)--;
1175                         }
1176                 } else if ((li->extLength >> 30) ==
1177                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1178                         udf_free_blocks(inode->i_sb, inode,
1179                                         &li->extLocation, 0,
1180                                         ((li->extLength &
1181                                                 UDF_EXTENT_LENGTH_MASK) +
1182                                          blocksize - 1) >> blocksize_bits);
1183                         li->extLocation.logicalBlockNum = 0;
1184                         li->extLocation.partitionReferenceNum = 0;
1185                         li->extLength = (li->extLength &
1186                                                 UDF_EXTENT_LENGTH_MASK) |
1187                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1188                 }
1189         }
1190 }
1191
1192 static void udf_update_extents(struct inode *inode,
1193                                struct kernel_long_ad laarr[EXTENT_MERGE_SIZE],
1194                                int startnum, int endnum,
1195                                struct extent_position *epos)
1196 {
1197         int start = 0, i;
1198         struct kernel_lb_addr tmploc;
1199         uint32_t tmplen;
1200
1201         if (startnum > endnum) {
1202                 for (i = 0; i < (startnum - endnum); i++)
1203                         udf_delete_aext(inode, *epos, laarr[i].extLocation,
1204                                         laarr[i].extLength);
1205         } else if (startnum < endnum) {
1206                 for (i = 0; i < (endnum - startnum); i++) {
1207                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1208                                         laarr[i].extLength);
1209                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1210                                       &laarr[i].extLength, 1);
1211                         start++;
1212                 }
1213         }
1214
1215         for (i = start; i < endnum; i++) {
1216                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1217                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1218                                laarr[i].extLength, 1);
1219         }
1220 }
1221
1222 struct buffer_head *udf_bread(struct inode *inode, int block,
1223                               int create, int *err)
1224 {
1225         struct buffer_head *bh = NULL;
1226
1227         bh = udf_getblk(inode, block, create, err);
1228         if (!bh)
1229                 return NULL;
1230
1231         if (buffer_uptodate(bh))
1232                 return bh;
1233
1234         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1235
1236         wait_on_buffer(bh);
1237         if (buffer_uptodate(bh))
1238                 return bh;
1239
1240         brelse(bh);
1241         *err = -EIO;
1242         return NULL;
1243 }
1244
1245 int udf_setsize(struct inode *inode, loff_t newsize)
1246 {
1247         int err;
1248         struct udf_inode_info *iinfo;
1249         int bsize = i_blocksize(inode);
1250
1251         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1252               S_ISLNK(inode->i_mode)))
1253                 return -EINVAL;
1254         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1255                 return -EPERM;
1256
1257         iinfo = UDF_I(inode);
1258         if (newsize > inode->i_size) {
1259                 down_write(&iinfo->i_data_sem);
1260                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1261                         if (bsize <
1262                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1263                                 err = udf_expand_file_adinicb(inode);
1264                                 if (err)
1265                                         return err;
1266                                 down_write(&iinfo->i_data_sem);
1267                         } else {
1268                                 iinfo->i_lenAlloc = newsize;
1269                                 goto set_size;
1270                         }
1271                 }
1272                 err = udf_extend_file(inode, newsize);
1273                 if (err) {
1274                         up_write(&iinfo->i_data_sem);
1275                         return err;
1276                 }
1277 set_size:
1278                 up_write(&iinfo->i_data_sem);
1279                 truncate_setsize(inode, newsize);
1280         } else {
1281                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1282                         down_write(&iinfo->i_data_sem);
1283                         udf_clear_extent_cache(inode);
1284                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1285                                0x00, bsize - newsize -
1286                                udf_file_entry_alloc_offset(inode));
1287                         iinfo->i_lenAlloc = newsize;
1288                         truncate_setsize(inode, newsize);
1289                         up_write(&iinfo->i_data_sem);
1290                         goto update_time;
1291                 }
1292                 err = block_truncate_page(inode->i_mapping, newsize,
1293                                           udf_get_block);
1294                 if (err)
1295                         return err;
1296                 truncate_setsize(inode, newsize);
1297                 down_write(&iinfo->i_data_sem);
1298                 udf_clear_extent_cache(inode);
1299                 udf_truncate_extents(inode);
1300                 up_write(&iinfo->i_data_sem);
1301         }
1302 update_time:
1303         inode->i_mtime = inode->i_ctime = current_time(inode);
1304         if (IS_SYNC(inode))
1305                 udf_sync_inode(inode);
1306         else
1307                 mark_inode_dirty(inode);
1308         return 0;
1309 }
1310
1311 /*
1312  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1313  * arbitrary - just that we hopefully don't limit any real use of rewritten
1314  * inode on write-once media but avoid looping for too long on corrupted media.
1315  */
1316 #define UDF_MAX_ICB_NESTING 1024
1317
1318 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1319 {
1320         struct buffer_head *bh = NULL;
1321         struct fileEntry *fe;
1322         struct extendedFileEntry *efe;
1323         uint16_t ident;
1324         struct udf_inode_info *iinfo = UDF_I(inode);
1325         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1326         struct kernel_lb_addr *iloc = &iinfo->i_location;
1327         unsigned int link_count;
1328         unsigned int indirections = 0;
1329         int bs = inode->i_sb->s_blocksize;
1330         int ret = -EIO;
1331
1332 reread:
1333         if (iloc->logicalBlockNum >=
1334             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1335                 udf_debug("block=%d, partition=%d out of range\n",
1336                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1337                 return -EIO;
1338         }
1339
1340         /*
1341          * Set defaults, but the inode is still incomplete!
1342          * Note: get_new_inode() sets the following on a new inode:
1343          *      i_sb = sb
1344          *      i_no = ino
1345          *      i_flags = sb->s_flags
1346          *      i_state = 0
1347          * clean_inode(): zero fills and sets
1348          *      i_count = 1
1349          *      i_nlink = 1
1350          *      i_op = NULL;
1351          */
1352         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1353         if (!bh) {
1354                 udf_err(inode->i_sb, "(ino %ld) failed !bh\n", inode->i_ino);
1355                 return -EIO;
1356         }
1357
1358         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1359             ident != TAG_IDENT_USE) {
1360                 udf_err(inode->i_sb, "(ino %ld) failed ident=%d\n",
1361                         inode->i_ino, ident);
1362                 goto out;
1363         }
1364
1365         fe = (struct fileEntry *)bh->b_data;
1366         efe = (struct extendedFileEntry *)bh->b_data;
1367
1368         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1369                 struct buffer_head *ibh;
1370
1371                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1372                 if (ident == TAG_IDENT_IE && ibh) {
1373                         struct kernel_lb_addr loc;
1374                         struct indirectEntry *ie;
1375
1376                         ie = (struct indirectEntry *)ibh->b_data;
1377                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1378
1379                         if (ie->indirectICB.extLength) {
1380                                 brelse(ibh);
1381                                 memcpy(&iinfo->i_location, &loc,
1382                                        sizeof(struct kernel_lb_addr));
1383                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1384                                         udf_err(inode->i_sb,
1385                                                 "too many ICBs in ICB hierarchy"
1386                                                 " (max %d supported)\n",
1387                                                 UDF_MAX_ICB_NESTING);
1388                                         goto out;
1389                                 }
1390                                 brelse(bh);
1391                                 goto reread;
1392                         }
1393                 }
1394                 brelse(ibh);
1395         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1396                 udf_err(inode->i_sb, "unsupported strategy type: %d\n",
1397                         le16_to_cpu(fe->icbTag.strategyType));
1398                 goto out;
1399         }
1400         if (fe->icbTag.strategyType == cpu_to_le16(4))
1401                 iinfo->i_strat4096 = 0;
1402         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1403                 iinfo->i_strat4096 = 1;
1404
1405         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1406                                                         ICBTAG_FLAG_AD_MASK;
1407         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1408             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1409             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1410                 ret = -EIO;
1411                 goto out;
1412         }
1413         iinfo->i_unique = 0;
1414         iinfo->i_lenEAttr = 0;
1415         iinfo->i_lenExtents = 0;
1416         iinfo->i_lenAlloc = 0;
1417         iinfo->i_next_alloc_block = 0;
1418         iinfo->i_next_alloc_goal = 0;
1419         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1420                 iinfo->i_efe = 1;
1421                 iinfo->i_use = 0;
1422                 ret = udf_alloc_i_data(inode, bs -
1423                                         sizeof(struct extendedFileEntry));
1424                 if (ret)
1425                         goto out;
1426                 memcpy(iinfo->i_ext.i_data,
1427                        bh->b_data + sizeof(struct extendedFileEntry),
1428                        bs - sizeof(struct extendedFileEntry));
1429         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1430                 iinfo->i_efe = 0;
1431                 iinfo->i_use = 0;
1432                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1433                 if (ret)
1434                         goto out;
1435                 memcpy(iinfo->i_ext.i_data,
1436                        bh->b_data + sizeof(struct fileEntry),
1437                        bs - sizeof(struct fileEntry));
1438         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1439                 iinfo->i_efe = 0;
1440                 iinfo->i_use = 1;
1441                 iinfo->i_lenAlloc = le32_to_cpu(
1442                                 ((struct unallocSpaceEntry *)bh->b_data)->
1443                                  lengthAllocDescs);
1444                 ret = udf_alloc_i_data(inode, bs -
1445                                         sizeof(struct unallocSpaceEntry));
1446                 if (ret)
1447                         goto out;
1448                 memcpy(iinfo->i_ext.i_data,
1449                        bh->b_data + sizeof(struct unallocSpaceEntry),
1450                        bs - sizeof(struct unallocSpaceEntry));
1451                 return 0;
1452         }
1453
1454         ret = -EIO;
1455         read_lock(&sbi->s_cred_lock);
1456         i_uid_write(inode, le32_to_cpu(fe->uid));
1457         if (!uid_valid(inode->i_uid) ||
1458             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_IGNORE) ||
1459             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1460                 inode->i_uid = UDF_SB(inode->i_sb)->s_uid;
1461
1462         i_gid_write(inode, le32_to_cpu(fe->gid));
1463         if (!gid_valid(inode->i_gid) ||
1464             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_IGNORE) ||
1465             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1466                 inode->i_gid = UDF_SB(inode->i_sb)->s_gid;
1467
1468         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1469                         sbi->s_fmode != UDF_INVALID_MODE)
1470                 inode->i_mode = sbi->s_fmode;
1471         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1472                         sbi->s_dmode != UDF_INVALID_MODE)
1473                 inode->i_mode = sbi->s_dmode;
1474         else
1475                 inode->i_mode = udf_convert_permissions(fe);
1476         inode->i_mode &= ~sbi->s_umask;
1477         read_unlock(&sbi->s_cred_lock);
1478
1479         link_count = le16_to_cpu(fe->fileLinkCount);
1480         if (!link_count) {
1481                 if (!hidden_inode) {
1482                         ret = -ESTALE;
1483                         goto out;
1484                 }
1485                 link_count = 1;
1486         }
1487         set_nlink(inode, link_count);
1488
1489         inode->i_size = le64_to_cpu(fe->informationLength);
1490         iinfo->i_lenExtents = inode->i_size;
1491
1492         if (iinfo->i_efe == 0) {
1493                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1494                         (inode->i_sb->s_blocksize_bits - 9);
1495
1496                 if (!udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime))
1497                         inode->i_atime = sbi->s_record_time;
1498
1499                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1500                                             fe->modificationTime))
1501                         inode->i_mtime = sbi->s_record_time;
1502
1503                 if (!udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime))
1504                         inode->i_ctime = sbi->s_record_time;
1505
1506                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1507                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1508                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1509                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1510         } else {
1511                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1512                     (inode->i_sb->s_blocksize_bits - 9);
1513
1514                 if (!udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime))
1515                         inode->i_atime = sbi->s_record_time;
1516
1517                 if (!udf_disk_stamp_to_time(&inode->i_mtime,
1518                                             efe->modificationTime))
1519                         inode->i_mtime = sbi->s_record_time;
1520
1521                 if (!udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime))
1522                         iinfo->i_crtime = sbi->s_record_time;
1523
1524                 if (!udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime))
1525                         inode->i_ctime = sbi->s_record_time;
1526
1527                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1528                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1529                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1530                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1531         }
1532         inode->i_generation = iinfo->i_unique;
1533
1534         /*
1535          * Sanity check length of allocation descriptors and extended attrs to
1536          * avoid integer overflows
1537          */
1538         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1539                 goto out;
1540         /* Now do exact checks */
1541         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1542                 goto out;
1543         /* Sanity checks for files in ICB so that we don't get confused later */
1544         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1545                 /*
1546                  * For file in ICB data is stored in allocation descriptor
1547                  * so sizes should match
1548                  */
1549                 if (iinfo->i_lenAlloc != inode->i_size)
1550                         goto out;
1551                 /* File in ICB has to fit in there... */
1552                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1553                         goto out;
1554         }
1555
1556         switch (fe->icbTag.fileType) {
1557         case ICBTAG_FILE_TYPE_DIRECTORY:
1558                 inode->i_op = &udf_dir_inode_operations;
1559                 inode->i_fop = &udf_dir_operations;
1560                 inode->i_mode |= S_IFDIR;
1561                 inc_nlink(inode);
1562                 break;
1563         case ICBTAG_FILE_TYPE_REALTIME:
1564         case ICBTAG_FILE_TYPE_REGULAR:
1565         case ICBTAG_FILE_TYPE_UNDEF:
1566         case ICBTAG_FILE_TYPE_VAT20:
1567                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1568                         inode->i_data.a_ops = &udf_adinicb_aops;
1569                 else
1570                         inode->i_data.a_ops = &udf_aops;
1571                 inode->i_op = &udf_file_inode_operations;
1572                 inode->i_fop = &udf_file_operations;
1573                 inode->i_mode |= S_IFREG;
1574                 break;
1575         case ICBTAG_FILE_TYPE_BLOCK:
1576                 inode->i_mode |= S_IFBLK;
1577                 break;
1578         case ICBTAG_FILE_TYPE_CHAR:
1579                 inode->i_mode |= S_IFCHR;
1580                 break;
1581         case ICBTAG_FILE_TYPE_FIFO:
1582                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1583                 break;
1584         case ICBTAG_FILE_TYPE_SOCKET:
1585                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1586                 break;
1587         case ICBTAG_FILE_TYPE_SYMLINK:
1588                 inode->i_data.a_ops = &udf_symlink_aops;
1589                 inode->i_op = &page_symlink_inode_operations;
1590                 inode_nohighmem(inode);
1591                 inode->i_mode = S_IFLNK | S_IRWXUGO;
1592                 break;
1593         case ICBTAG_FILE_TYPE_MAIN:
1594                 udf_debug("METADATA FILE-----\n");
1595                 break;
1596         case ICBTAG_FILE_TYPE_MIRROR:
1597                 udf_debug("METADATA MIRROR FILE-----\n");
1598                 break;
1599         case ICBTAG_FILE_TYPE_BITMAP:
1600                 udf_debug("METADATA BITMAP FILE-----\n");
1601                 break;
1602         default:
1603                 udf_err(inode->i_sb, "(ino %ld) failed unknown file type=%d\n",
1604                         inode->i_ino, fe->icbTag.fileType);
1605                 goto out;
1606         }
1607         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1608                 struct deviceSpec *dsea =
1609                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1610                 if (dsea) {
1611                         init_special_inode(inode, inode->i_mode,
1612                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1613                                       le32_to_cpu(dsea->minorDeviceIdent)));
1614                         /* Developer ID ??? */
1615                 } else
1616                         goto out;
1617         }
1618         ret = 0;
1619 out:
1620         brelse(bh);
1621         return ret;
1622 }
1623
1624 static int udf_alloc_i_data(struct inode *inode, size_t size)
1625 {
1626         struct udf_inode_info *iinfo = UDF_I(inode);
1627         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1628
1629         if (!iinfo->i_ext.i_data) {
1630                 udf_err(inode->i_sb, "(ino %ld) no free memory\n",
1631                         inode->i_ino);
1632                 return -ENOMEM;
1633         }
1634
1635         return 0;
1636 }
1637
1638 static umode_t udf_convert_permissions(struct fileEntry *fe)
1639 {
1640         umode_t mode;
1641         uint32_t permissions;
1642         uint32_t flags;
1643
1644         permissions = le32_to_cpu(fe->permissions);
1645         flags = le16_to_cpu(fe->icbTag.flags);
1646
1647         mode =  ((permissions) & S_IRWXO) |
1648                 ((permissions >> 2) & S_IRWXG) |
1649                 ((permissions >> 4) & S_IRWXU) |
1650                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1651                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1652                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1653
1654         return mode;
1655 }
1656
1657 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1658 {
1659         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1660 }
1661
1662 static int udf_sync_inode(struct inode *inode)
1663 {
1664         return udf_update_inode(inode, 1);
1665 }
1666
1667 static int udf_update_inode(struct inode *inode, int do_sync)
1668 {
1669         struct buffer_head *bh = NULL;
1670         struct fileEntry *fe;
1671         struct extendedFileEntry *efe;
1672         uint64_t lb_recorded;
1673         uint32_t udfperms;
1674         uint16_t icbflags;
1675         uint16_t crclen;
1676         int err = 0;
1677         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1678         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1679         struct udf_inode_info *iinfo = UDF_I(inode);
1680
1681         bh = udf_tgetblk(inode->i_sb,
1682                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1683         if (!bh) {
1684                 udf_debug("getblk failure\n");
1685                 return -EIO;
1686         }
1687
1688         lock_buffer(bh);
1689         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1690         fe = (struct fileEntry *)bh->b_data;
1691         efe = (struct extendedFileEntry *)bh->b_data;
1692
1693         if (iinfo->i_use) {
1694                 struct unallocSpaceEntry *use =
1695                         (struct unallocSpaceEntry *)bh->b_data;
1696
1697                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1698                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1699                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1700                                         sizeof(struct unallocSpaceEntry));
1701                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1702                 crclen = sizeof(struct unallocSpaceEntry);
1703
1704                 goto finish;
1705         }
1706
1707         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1708                 fe->uid = cpu_to_le32(-1);
1709         else
1710                 fe->uid = cpu_to_le32(i_uid_read(inode));
1711
1712         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1713                 fe->gid = cpu_to_le32(-1);
1714         else
1715                 fe->gid = cpu_to_le32(i_gid_read(inode));
1716
1717         udfperms = ((inode->i_mode & S_IRWXO)) |
1718                    ((inode->i_mode & S_IRWXG) << 2) |
1719                    ((inode->i_mode & S_IRWXU) << 4);
1720
1721         udfperms |= (le32_to_cpu(fe->permissions) &
1722                     (FE_PERM_O_DELETE | FE_PERM_O_CHATTR |
1723                      FE_PERM_G_DELETE | FE_PERM_G_CHATTR |
1724                      FE_PERM_U_DELETE | FE_PERM_U_CHATTR));
1725         fe->permissions = cpu_to_le32(udfperms);
1726
1727         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1728                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1729         else
1730                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1731
1732         fe->informationLength = cpu_to_le64(inode->i_size);
1733
1734         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1735                 struct regid *eid;
1736                 struct deviceSpec *dsea =
1737                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1738                 if (!dsea) {
1739                         dsea = (struct deviceSpec *)
1740                                 udf_add_extendedattr(inode,
1741                                                      sizeof(struct deviceSpec) +
1742                                                      sizeof(struct regid), 12, 0x3);
1743                         dsea->attrType = cpu_to_le32(12);
1744                         dsea->attrSubtype = 1;
1745                         dsea->attrLength = cpu_to_le32(
1746                                                 sizeof(struct deviceSpec) +
1747                                                 sizeof(struct regid));
1748                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1749                 }
1750                 eid = (struct regid *)dsea->impUse;
1751                 memset(eid, 0, sizeof(struct regid));
1752                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1753                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1754                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1755                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1756                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1757         }
1758
1759         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1760                 lb_recorded = 0; /* No extents => no blocks! */
1761         else
1762                 lb_recorded =
1763                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1764                         (blocksize_bits - 9);
1765
1766         if (iinfo->i_efe == 0) {
1767                 memcpy(bh->b_data + sizeof(struct fileEntry),
1768                        iinfo->i_ext.i_data,
1769                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1770                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1771
1772                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1773                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1774                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1775                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1776                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1777                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1778                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1779                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1780                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1781                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1782                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1783                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1784                 crclen = sizeof(struct fileEntry);
1785         } else {
1786                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1787                        iinfo->i_ext.i_data,
1788                        inode->i_sb->s_blocksize -
1789                                         sizeof(struct extendedFileEntry));
1790                 efe->objectSize = cpu_to_le64(inode->i_size);
1791                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1792
1793                 if (iinfo->i_crtime.tv_sec > inode->i_atime.tv_sec ||
1794                     (iinfo->i_crtime.tv_sec == inode->i_atime.tv_sec &&
1795                      iinfo->i_crtime.tv_nsec > inode->i_atime.tv_nsec))
1796                         iinfo->i_crtime = inode->i_atime;
1797
1798                 if (iinfo->i_crtime.tv_sec > inode->i_mtime.tv_sec ||
1799                     (iinfo->i_crtime.tv_sec == inode->i_mtime.tv_sec &&
1800                      iinfo->i_crtime.tv_nsec > inode->i_mtime.tv_nsec))
1801                         iinfo->i_crtime = inode->i_mtime;
1802
1803                 if (iinfo->i_crtime.tv_sec > inode->i_ctime.tv_sec ||
1804                     (iinfo->i_crtime.tv_sec == inode->i_ctime.tv_sec &&
1805                      iinfo->i_crtime.tv_nsec > inode->i_ctime.tv_nsec))
1806                         iinfo->i_crtime = inode->i_ctime;
1807
1808                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1809                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1810                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1811                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1812
1813                 memset(&(efe->impIdent), 0, sizeof(struct regid));
1814                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1815                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1816                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1817                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1818                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1819                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1820                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1821                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1822                 crclen = sizeof(struct extendedFileEntry);
1823         }
1824
1825 finish:
1826         if (iinfo->i_strat4096) {
1827                 fe->icbTag.strategyType = cpu_to_le16(4096);
1828                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1829                 fe->icbTag.numEntries = cpu_to_le16(2);
1830         } else {
1831                 fe->icbTag.strategyType = cpu_to_le16(4);
1832                 fe->icbTag.numEntries = cpu_to_le16(1);
1833         }
1834
1835         if (iinfo->i_use)
1836                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1837         else if (S_ISDIR(inode->i_mode))
1838                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1839         else if (S_ISREG(inode->i_mode))
1840                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1841         else if (S_ISLNK(inode->i_mode))
1842                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1843         else if (S_ISBLK(inode->i_mode))
1844                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1845         else if (S_ISCHR(inode->i_mode))
1846                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1847         else if (S_ISFIFO(inode->i_mode))
1848                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1849         else if (S_ISSOCK(inode->i_mode))
1850                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1851
1852         icbflags =      iinfo->i_alloc_type |
1853                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1854                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1855                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1856                         (le16_to_cpu(fe->icbTag.flags) &
1857                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1858                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1859
1860         fe->icbTag.flags = cpu_to_le16(icbflags);
1861         if (sbi->s_udfrev >= 0x0200)
1862                 fe->descTag.descVersion = cpu_to_le16(3);
1863         else
1864                 fe->descTag.descVersion = cpu_to_le16(2);
1865         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1866         fe->descTag.tagLocation = cpu_to_le32(
1867                                         iinfo->i_location.logicalBlockNum);
1868         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1869         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1870         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1871                                                   crclen));
1872         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1873
1874         set_buffer_uptodate(bh);
1875         unlock_buffer(bh);
1876
1877         /* write the data blocks */
1878         mark_buffer_dirty(bh);
1879         if (do_sync) {
1880                 sync_dirty_buffer(bh);
1881                 if (buffer_write_io_error(bh)) {
1882                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1883                                  inode->i_ino);
1884                         err = -EIO;
1885                 }
1886         }
1887         brelse(bh);
1888
1889         return err;
1890 }
1891
1892 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1893                          bool hidden_inode)
1894 {
1895         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1896         struct inode *inode = iget_locked(sb, block);
1897         int err;
1898
1899         if (!inode)
1900                 return ERR_PTR(-ENOMEM);
1901
1902         if (!(inode->i_state & I_NEW))
1903                 return inode;
1904
1905         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1906         err = udf_read_inode(inode, hidden_inode);
1907         if (err < 0) {
1908                 iget_failed(inode);
1909                 return ERR_PTR(err);
1910         }
1911         unlock_new_inode(inode);
1912
1913         return inode;
1914 }
1915
1916 int udf_setup_indirect_aext(struct inode *inode, int block,
1917                             struct extent_position *epos)
1918 {
1919         struct super_block *sb = inode->i_sb;
1920         struct buffer_head *bh;
1921         struct allocExtDesc *aed;
1922         struct extent_position nepos;
1923         struct kernel_lb_addr neloc;
1924         int ver, adsize;
1925
1926         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1927                 adsize = sizeof(struct short_ad);
1928         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1929                 adsize = sizeof(struct long_ad);
1930         else
1931                 return -EIO;
1932
1933         neloc.logicalBlockNum = block;
1934         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1935
1936         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1937         if (!bh)
1938                 return -EIO;
1939         lock_buffer(bh);
1940         memset(bh->b_data, 0x00, sb->s_blocksize);
1941         set_buffer_uptodate(bh);
1942         unlock_buffer(bh);
1943         mark_buffer_dirty_inode(bh, inode);
1944
1945         aed = (struct allocExtDesc *)(bh->b_data);
1946         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1947                 aed->previousAllocExtLocation =
1948                                 cpu_to_le32(epos->block.logicalBlockNum);
1949         }
1950         aed->lengthAllocDescs = cpu_to_le32(0);
1951         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1952                 ver = 3;
1953         else
1954                 ver = 2;
1955         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1956                     sizeof(struct tag));
1957
1958         nepos.block = neloc;
1959         nepos.offset = sizeof(struct allocExtDesc);
1960         nepos.bh = bh;
1961
1962         /*
1963          * Do we have to copy current last extent to make space for indirect
1964          * one?
1965          */
1966         if (epos->offset + adsize > sb->s_blocksize) {
1967                 struct kernel_lb_addr cp_loc;
1968                 uint32_t cp_len;
1969                 int cp_type;
1970
1971                 epos->offset -= adsize;
1972                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1973                 cp_len |= ((uint32_t)cp_type) << 30;
1974
1975                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1976                 udf_write_aext(inode, epos, &nepos.block,
1977                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1978         } else {
1979                 __udf_add_aext(inode, epos, &nepos.block,
1980                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1981         }
1982
1983         brelse(epos->bh);
1984         *epos = nepos;
1985
1986         return 0;
1987 }
1988
1989 /*
1990  * Append extent at the given position - should be the first free one in inode
1991  * / indirect extent. This function assumes there is enough space in the inode
1992  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1993  */
1994 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
1995                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
1996 {
1997         struct udf_inode_info *iinfo = UDF_I(inode);
1998         struct allocExtDesc *aed;
1999         int adsize;
2000
2001         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2002                 adsize = sizeof(struct short_ad);
2003         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2004                 adsize = sizeof(struct long_ad);
2005         else
2006                 return -EIO;
2007
2008         if (!epos->bh) {
2009                 WARN_ON(iinfo->i_lenAlloc !=
2010                         epos->offset - udf_file_entry_alloc_offset(inode));
2011         } else {
2012                 aed = (struct allocExtDesc *)epos->bh->b_data;
2013                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2014                         epos->offset - sizeof(struct allocExtDesc));
2015                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2016         }
2017
2018         udf_write_aext(inode, epos, eloc, elen, inc);
2019
2020         if (!epos->bh) {
2021                 iinfo->i_lenAlloc += adsize;
2022                 mark_inode_dirty(inode);
2023         } else {
2024                 aed = (struct allocExtDesc *)epos->bh->b_data;
2025                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2026                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2027                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2028                         udf_update_tag(epos->bh->b_data,
2029                                         epos->offset + (inc ? 0 : adsize));
2030                 else
2031                         udf_update_tag(epos->bh->b_data,
2032                                         sizeof(struct allocExtDesc));
2033                 mark_buffer_dirty_inode(epos->bh, inode);
2034         }
2035
2036         return 0;
2037 }
2038
2039 /*
2040  * Append extent at given position - should be the first free one in inode
2041  * / indirect extent. Takes care of allocating and linking indirect blocks.
2042  */
2043 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2044                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2045 {
2046         int adsize;
2047         struct super_block *sb = inode->i_sb;
2048
2049         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2050                 adsize = sizeof(struct short_ad);
2051         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2052                 adsize = sizeof(struct long_ad);
2053         else
2054                 return -EIO;
2055
2056         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2057                 int err;
2058                 int new_block;
2059
2060                 new_block = udf_new_block(sb, NULL,
2061                                           epos->block.partitionReferenceNum,
2062                                           epos->block.logicalBlockNum, &err);
2063                 if (!new_block)
2064                         return -ENOSPC;
2065
2066                 err = udf_setup_indirect_aext(inode, new_block, epos);
2067                 if (err)
2068                         return err;
2069         }
2070
2071         return __udf_add_aext(inode, epos, eloc, elen, inc);
2072 }
2073
2074 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2075                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2076 {
2077         int adsize;
2078         uint8_t *ptr;
2079         struct short_ad *sad;
2080         struct long_ad *lad;
2081         struct udf_inode_info *iinfo = UDF_I(inode);
2082
2083         if (!epos->bh)
2084                 ptr = iinfo->i_ext.i_data + epos->offset -
2085                         udf_file_entry_alloc_offset(inode) +
2086                         iinfo->i_lenEAttr;
2087         else
2088                 ptr = epos->bh->b_data + epos->offset;
2089
2090         switch (iinfo->i_alloc_type) {
2091         case ICBTAG_FLAG_AD_SHORT:
2092                 sad = (struct short_ad *)ptr;
2093                 sad->extLength = cpu_to_le32(elen);
2094                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2095                 adsize = sizeof(struct short_ad);
2096                 break;
2097         case ICBTAG_FLAG_AD_LONG:
2098                 lad = (struct long_ad *)ptr;
2099                 lad->extLength = cpu_to_le32(elen);
2100                 lad->extLocation = cpu_to_lelb(*eloc);
2101                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2102                 adsize = sizeof(struct long_ad);
2103                 break;
2104         default:
2105                 return;
2106         }
2107
2108         if (epos->bh) {
2109                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2110                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2111                         struct allocExtDesc *aed =
2112                                 (struct allocExtDesc *)epos->bh->b_data;
2113                         udf_update_tag(epos->bh->b_data,
2114                                        le32_to_cpu(aed->lengthAllocDescs) +
2115                                        sizeof(struct allocExtDesc));
2116                 }
2117                 mark_buffer_dirty_inode(epos->bh, inode);
2118         } else {
2119                 mark_inode_dirty(inode);
2120         }
2121
2122         if (inc)
2123                 epos->offset += adsize;
2124 }
2125
2126 /*
2127  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2128  * someone does some weird stuff.
2129  */
2130 #define UDF_MAX_INDIR_EXTS 16
2131
2132 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2133                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2134 {
2135         int8_t etype;
2136         unsigned int indirections = 0;
2137
2138         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2139                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2140                 int block;
2141
2142                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2143                         udf_err(inode->i_sb,
2144                                 "too many indirect extents in inode %lu\n",
2145                                 inode->i_ino);
2146                         return -1;
2147                 }
2148
2149                 epos->block = *eloc;
2150                 epos->offset = sizeof(struct allocExtDesc);
2151                 brelse(epos->bh);
2152                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2153                 epos->bh = udf_tread(inode->i_sb, block);
2154                 if (!epos->bh) {
2155                         udf_debug("reading block %d failed!\n", block);
2156                         return -1;
2157                 }
2158         }
2159
2160         return etype;
2161 }
2162
2163 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2164                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2165 {
2166         int alen;
2167         int8_t etype;
2168         uint8_t *ptr;
2169         struct short_ad *sad;
2170         struct long_ad *lad;
2171         struct udf_inode_info *iinfo = UDF_I(inode);
2172
2173         if (!epos->bh) {
2174                 if (!epos->offset)
2175                         epos->offset = udf_file_entry_alloc_offset(inode);
2176                 ptr = iinfo->i_ext.i_data + epos->offset -
2177                         udf_file_entry_alloc_offset(inode) +
2178                         iinfo->i_lenEAttr;
2179                 alen = udf_file_entry_alloc_offset(inode) +
2180                                                         iinfo->i_lenAlloc;
2181         } else {
2182                 if (!epos->offset)
2183                         epos->offset = sizeof(struct allocExtDesc);
2184                 ptr = epos->bh->b_data + epos->offset;
2185                 alen = sizeof(struct allocExtDesc) +
2186                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2187                                                         lengthAllocDescs);
2188         }
2189
2190         switch (iinfo->i_alloc_type) {
2191         case ICBTAG_FLAG_AD_SHORT:
2192                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2193                 if (!sad)
2194                         return -1;
2195                 etype = le32_to_cpu(sad->extLength) >> 30;
2196                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2197                 eloc->partitionReferenceNum =
2198                                 iinfo->i_location.partitionReferenceNum;
2199                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2200                 break;
2201         case ICBTAG_FLAG_AD_LONG:
2202                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2203                 if (!lad)
2204                         return -1;
2205                 etype = le32_to_cpu(lad->extLength) >> 30;
2206                 *eloc = lelb_to_cpu(lad->extLocation);
2207                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2208                 break;
2209         default:
2210                 udf_debug("alloc_type = %d unsupported\n", iinfo->i_alloc_type);
2211                 return -1;
2212         }
2213
2214         return etype;
2215 }
2216
2217 static int8_t udf_insert_aext(struct inode *inode, struct extent_position epos,
2218                               struct kernel_lb_addr neloc, uint32_t nelen)
2219 {
2220         struct kernel_lb_addr oeloc;
2221         uint32_t oelen;
2222         int8_t etype;
2223
2224         if (epos.bh)
2225                 get_bh(epos.bh);
2226
2227         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2228                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2229                 neloc = oeloc;
2230                 nelen = (etype << 30) | oelen;
2231         }
2232         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2233         brelse(epos.bh);
2234
2235         return (nelen >> 30);
2236 }
2237
2238 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos,
2239                        struct kernel_lb_addr eloc, uint32_t elen)
2240 {
2241         struct extent_position oepos;
2242         int adsize;
2243         int8_t etype;
2244         struct allocExtDesc *aed;
2245         struct udf_inode_info *iinfo;
2246
2247         if (epos.bh) {
2248                 get_bh(epos.bh);
2249                 get_bh(epos.bh);
2250         }
2251
2252         iinfo = UDF_I(inode);
2253         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2254                 adsize = sizeof(struct short_ad);
2255         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2256                 adsize = sizeof(struct long_ad);
2257         else
2258                 adsize = 0;
2259
2260         oepos = epos;
2261         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2262                 return -1;
2263
2264         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2265                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2266                 if (oepos.bh != epos.bh) {
2267                         oepos.block = epos.block;
2268                         brelse(oepos.bh);
2269                         get_bh(epos.bh);
2270                         oepos.bh = epos.bh;
2271                         oepos.offset = epos.offset - adsize;
2272                 }
2273         }
2274         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2275         elen = 0;
2276
2277         if (epos.bh != oepos.bh) {
2278                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2279                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2280                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2281                 if (!oepos.bh) {
2282                         iinfo->i_lenAlloc -= (adsize * 2);
2283                         mark_inode_dirty(inode);
2284                 } else {
2285                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2286                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2287                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2288                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2289                                 udf_update_tag(oepos.bh->b_data,
2290                                                 oepos.offset - (2 * adsize));
2291                         else
2292                                 udf_update_tag(oepos.bh->b_data,
2293                                                 sizeof(struct allocExtDesc));
2294                         mark_buffer_dirty_inode(oepos.bh, inode);
2295                 }
2296         } else {
2297                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2298                 if (!oepos.bh) {
2299                         iinfo->i_lenAlloc -= adsize;
2300                         mark_inode_dirty(inode);
2301                 } else {
2302                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2303                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2304                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2305                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2306                                 udf_update_tag(oepos.bh->b_data,
2307                                                 epos.offset - adsize);
2308                         else
2309                                 udf_update_tag(oepos.bh->b_data,
2310                                                 sizeof(struct allocExtDesc));
2311                         mark_buffer_dirty_inode(oepos.bh, inode);
2312                 }
2313         }
2314
2315         brelse(epos.bh);
2316         brelse(oepos.bh);
2317
2318         return (elen >> 30);
2319 }
2320
2321 int8_t inode_bmap(struct inode *inode, sector_t block,
2322                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2323                   uint32_t *elen, sector_t *offset)
2324 {
2325         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2326         loff_t lbcount = 0, bcount =
2327             (loff_t) block << blocksize_bits;
2328         int8_t etype;
2329         struct udf_inode_info *iinfo;
2330
2331         iinfo = UDF_I(inode);
2332         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2333                 pos->offset = 0;
2334                 pos->block = iinfo->i_location;
2335                 pos->bh = NULL;
2336         }
2337         *elen = 0;
2338         do {
2339                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2340                 if (etype == -1) {
2341                         *offset = (bcount - lbcount) >> blocksize_bits;
2342                         iinfo->i_lenExtents = lbcount;
2343                         return -1;
2344                 }
2345                 lbcount += *elen;
2346         } while (lbcount <= bcount);
2347         /* update extent cache */
2348         udf_update_extent_cache(inode, lbcount - *elen, pos, 1);
2349         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2350
2351         return etype;
2352 }
2353
2354 long udf_block_map(struct inode *inode, sector_t block)
2355 {
2356         struct kernel_lb_addr eloc;
2357         uint32_t elen;
2358         sector_t offset;
2359         struct extent_position epos = {};
2360         int ret;
2361
2362         down_read(&UDF_I(inode)->i_data_sem);
2363
2364         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2365                                                 (EXT_RECORDED_ALLOCATED >> 30))
2366                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2367         else
2368                 ret = 0;
2369
2370         up_read(&UDF_I(inode)->i_data_sem);
2371         brelse(epos.bh);
2372
2373         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2374                 return udf_fixed_to_variable(ret);
2375         else
2376                 return ret;
2377 }