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