fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 #define EXTENT_MERGE_SIZE 5
  47
  48 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
  49                          FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
  50                          FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
  51
  52 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
  53                          FE_PERM_O_DELETE)
  54
  55 static umode_t udf_convert_permissions(struct fileEntry *);
  56 static int udf_update_inode(struct inode *, int);
  57 static int udf_sync_inode(struct inode *inode);
  58 static int udf_alloc_i_data(struct inode *inode, size_t size);
  59 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  60 static int udf_insert_aext(struct inode *, struct extent_position,
  61                            struct kernel_lb_addr, uint32_t);
  62 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
  63                               struct kernel_long_ad *, int *);
  64 static void udf_prealloc_extents(struct inode *, int, int,
  65                                  struct kernel_long_ad *, int *);
  66 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  67 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  68                               int, struct extent_position *);
  69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  70
  71 static void __udf_clear_extent_cache(struct inode *inode)
  72 {
  73         struct udf_inode_info *iinfo = UDF_I(inode);
  74
  75         if (iinfo->cached_extent.lstart != -1) {
  76                 brelse(iinfo->cached_extent.epos.bh);
  77                 iinfo->cached_extent.lstart = -1;
  78         }
  79 }
  80
  81 /* Invalidate extent cache */
  82 static void udf_clear_extent_cache(struct inode *inode)
  83 {
  84         struct udf_inode_info *iinfo = UDF_I(inode);
  85
  86         spin_lock(&iinfo->i_extent_cache_lock);
  87         __udf_clear_extent_cache(inode);
  88         spin_unlock(&iinfo->i_extent_cache_lock);
  89 }
  90
  91 /* Return contents of extent cache */
  92 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  93                                  loff_t *lbcount, struct extent_position *pos)
  94 {
  95         struct udf_inode_info *iinfo = UDF_I(inode);
  96         int ret = 0;
  97
  98         spin_lock(&iinfo->i_extent_cache_lock);
  99         if ((iinfo->cached_extent.lstart <= bcount) &&
 100             (iinfo->cached_extent.lstart != -1)) {
 101                 /* Cache hit */
 102                 *lbcount = iinfo->cached_extent.lstart;
 103                 memcpy(pos, &iinfo->cached_extent.epos,
 104                        sizeof(struct extent_position));
 105                 if (pos->bh)
 106                         get_bh(pos->bh);
 107                 ret = 1;
 108         }
 109         spin_unlock(&iinfo->i_extent_cache_lock);
 110         return ret;
 111 }
 112
 113 /* Add extent to extent cache */
 114 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 115                                     struct extent_position *pos)
 116 {
 117         struct udf_inode_info *iinfo = UDF_I(inode);
 118
 119         spin_lock(&iinfo->i_extent_cache_lock);
 120         /* Invalidate previously cached extent */
 121         __udf_clear_extent_cache(inode);
 122         if (pos->bh)
 123                 get_bh(pos->bh);
 124         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 125         iinfo->cached_extent.lstart = estart;
 126         switch (iinfo->i_alloc_type) {
 127         case ICBTAG_FLAG_AD_SHORT:
 128                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 129                 break;
 130         case ICBTAG_FLAG_AD_LONG:
 131                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 132                 break;
 133         }
 134         spin_unlock(&iinfo->i_extent_cache_lock);
 135 }
 136
 137 void udf_evict_inode(struct inode *inode)
 138 {
 139         struct udf_inode_info *iinfo = UDF_I(inode);
 140         int want_delete = 0;
 141
 142         if (!is_bad_inode(inode)) {
 143                 if (!inode->i_nlink) {
 144                         want_delete = 1;
 145                         udf_setsize(inode, 0);
 146                         udf_update_inode(inode, IS_SYNC(inode));
 147                 }
 148                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 149                     inode->i_size != iinfo->i_lenExtents) {
 150                         udf_warn(inode->i_sb,
 151                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 152                                  inode->i_ino, inode->i_mode,
 153                                  (unsigned long long)inode->i_size,
 154                                  (unsigned long long)iinfo->i_lenExtents);
 155                 }
 156         }
 157         truncate_inode_pages_final(&inode->i_data);
 158         invalidate_inode_buffers(inode);
 159         clear_inode(inode);
 160         kfree(iinfo->i_ext.i_data);
 161         iinfo->i_ext.i_data = NULL;
 162         udf_clear_extent_cache(inode);
 163         if (want_delete) {
 164                 udf_free_inode(inode);
 165         }
 166 }
 167
 168 static void udf_write_failed(struct address_space *mapping, loff_t to)
 169 {
 170         struct inode *inode = mapping->host;
 171         struct udf_inode_info *iinfo = UDF_I(inode);
 172         loff_t isize = inode->i_size;
 173
 174         if (to > isize) {
 175                 truncate_pagecache(inode, isize);
 176                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 177                         down_write(&iinfo->i_data_sem);
 178                         udf_clear_extent_cache(inode);
 179                         udf_truncate_extents(inode);
 180                         up_write(&iinfo->i_data_sem);
 181                 }
 182         }
 183 }
 184
 185 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 186 {
 187         return block_write_full_page(page, udf_get_block, wbc);
 188 }
 189
 190 static int udf_writepages(struct address_space *mapping,
 191                         struct writeback_control *wbc)
 192 {
 193         return mpage_writepages(mapping, wbc, udf_get_block);
 194 }
 195
 196 static int udf_readpage(struct file *file, struct page *page)
 197 {
 198         return mpage_readpage(page, udf_get_block);
 199 }
 200
 201 static int udf_readpages(struct file *file, struct address_space *mapping,
 202                         struct list_head *pages, unsigned nr_pages)
 203 {
 204         return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 205 }
 206
 207 static int udf_write_begin(struct file *file, struct address_space *mapping,
 208                         loff_t pos, unsigned len, unsigned flags,
 209                         struct page **pagep, void **fsdata)
 210 {
 211         int ret;
 212
 213         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 214         if (unlikely(ret))
 215                 udf_write_failed(mapping, pos + len);
 216         return ret;
 217 }
 218
 219 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 220 {
 221         struct file *file = iocb->ki_filp;
 222         struct address_space *mapping = file->f_mapping;
 223         struct inode *inode = mapping->host;
 224         size_t count = iov_iter_count(iter);
 225         ssize_t ret;
 226
 227         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 228         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 229                 udf_write_failed(mapping, iocb->ki_pos + count);
 230         return ret;
 231 }
 232
 233 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 234 {
 235         return generic_block_bmap(mapping, block, udf_get_block);
 236 }
 237
 238 const struct address_space_operations udf_aops = {
 239         .readpage       = udf_readpage,
 240         .readpages      = udf_readpages,
 241         .writepage      = udf_writepage,
 242         .writepages     = udf_writepages,
 243         .write_begin    = udf_write_begin,
 244         .write_end      = generic_write_end,
 245         .direct_IO      = udf_direct_IO,
 246         .bmap           = udf_bmap,
 247 };
 248
 249 /*
 250  * Expand file stored in ICB to a normal one-block-file
 251  *
 252  * This function requires i_data_sem for writing and releases it.
 253  * This function requires i_mutex held
 254  */
 255 int udf_expand_file_adinicb(struct inode *inode)
 256 {
 257         struct page *page;
 258         char *kaddr;
 259         struct udf_inode_info *iinfo = UDF_I(inode);
 260         int err;
 261
 262         WARN_ON_ONCE(!inode_is_locked(inode));
 263         if (!iinfo->i_lenAlloc) {
 264                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 265                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 266                 else
 267                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 268                 /* from now on we have normal address_space methods */
 269                 inode->i_data.a_ops = &udf_aops;
 270                 up_write(&iinfo->i_data_sem);
 271                 mark_inode_dirty(inode);
 272                 return 0;
 273         }
 274         /*
 275          * Release i_data_sem so that we can lock a page - page lock ranks
 276          * above i_data_sem. i_mutex still protects us against file changes.
 277          */
 278         up_write(&iinfo->i_data_sem);
 279
 280         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 281         if (!page)
 282                 return -ENOMEM;
 283
 284         if (!PageUptodate(page)) {
 285                 kaddr = kmap_atomic(page);
 286                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 287                        PAGE_SIZE - iinfo->i_lenAlloc);
 288                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 289                         iinfo->i_lenAlloc);
 290                 flush_dcache_page(page);
 291                 SetPageUptodate(page);
 292                 kunmap_atomic(kaddr);
 293         }
 294         down_write(&iinfo->i_data_sem);
 295         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 296                iinfo->i_lenAlloc);
 297         iinfo->i_lenAlloc = 0;
 298         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 299                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 300         else
 301                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 302         /* from now on we have normal address_space methods */
 303         inode->i_data.a_ops = &udf_aops;
 304         set_page_dirty(page);
 305         unlock_page(page);
 306         up_write(&iinfo->i_data_sem);
 307         err = filemap_fdatawrite(inode->i_mapping);
 308         if (err) {
 309                 /* Restore everything back so that we don't lose data... */
 310                 lock_page(page);
 311                 down_write(&iinfo->i_data_sem);
 312                 kaddr = kmap_atomic(page);
 313                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 314                        inode->i_size);
 315                 kunmap_atomic(kaddr);
 316                 unlock_page(page);
 317                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 318                 inode->i_data.a_ops = &udf_adinicb_aops;
 319                 iinfo->i_lenAlloc = inode->i_size;
 320                 up_write(&iinfo->i_data_sem);
 321         }
 322         put_page(page);
 323         mark_inode_dirty(inode);
 324
 325         return err;
 326 }
 327
 328 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
 329                                             udf_pblk_t *block, int *err)
 330 {
 331         udf_pblk_t newblock;
 332         struct buffer_head *dbh = NULL;
 333         struct kernel_lb_addr eloc;
 334         uint8_t alloctype;
 335         struct extent_position epos;
 336
 337         struct udf_fileident_bh sfibh, dfibh;
 338         loff_t f_pos = udf_ext0_offset(inode);
 339         int size = udf_ext0_offset(inode) + inode->i_size;
 340         struct fileIdentDesc cfi, *sfi, *dfi;
 341         struct udf_inode_info *iinfo = UDF_I(inode);
 342
 343         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 344                 alloctype = ICBTAG_FLAG_AD_SHORT;
 345         else
 346                 alloctype = ICBTAG_FLAG_AD_LONG;
 347
 348         if (!inode->i_size) {
 349                 iinfo->i_alloc_type = alloctype;
 350                 mark_inode_dirty(inode);
 351                 return NULL;
 352         }
 353
 354         /* alloc block, and copy data to it */
 355         *block = udf_new_block(inode->i_sb, inode,
 356                                iinfo->i_location.partitionReferenceNum,
 357                                iinfo->i_location.logicalBlockNum, err);
 358         if (!(*block))
 359                 return NULL;
 360         newblock = udf_get_pblock(inode->i_sb, *block,
 361                                   iinfo->i_location.partitionReferenceNum,
 362                                 0);
 363         if (!newblock)
 364                 return NULL;
 365         dbh = udf_tgetblk(inode->i_sb, newblock);
 366         if (!dbh)
 367                 return NULL;
 368         lock_buffer(dbh);
 369         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 370         set_buffer_uptodate(dbh);
 371         unlock_buffer(dbh);
 372         mark_buffer_dirty_inode(dbh, inode);
 373
 374         sfibh.soffset = sfibh.eoffset =
 375                         f_pos & (inode->i_sb->s_blocksize - 1);
 376         sfibh.sbh = sfibh.ebh = NULL;
 377         dfibh.soffset = dfibh.eoffset = 0;
 378         dfibh.sbh = dfibh.ebh = dbh;
 379         while (f_pos < size) {
 380                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 381                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 382                                          NULL, NULL, NULL);
 383                 if (!sfi) {
 384                         brelse(dbh);
 385                         return NULL;
 386                 }
 387                 iinfo->i_alloc_type = alloctype;
 388                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 389                 dfibh.soffset = dfibh.eoffset;
 390                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 391                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 392                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 393                                  sfi->fileIdent +
 394                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 395                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 396                         brelse(dbh);
 397                         return NULL;
 398                 }
 399         }
 400         mark_buffer_dirty_inode(dbh, inode);
 401
 402         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 403                 iinfo->i_lenAlloc);
 404         iinfo->i_lenAlloc = 0;
 405         eloc.logicalBlockNum = *block;
 406         eloc.partitionReferenceNum =
 407                                 iinfo->i_location.partitionReferenceNum;
 408         iinfo->i_lenExtents = inode->i_size;
 409         epos.bh = NULL;
 410         epos.block = iinfo->i_location;
 411         epos.offset = udf_file_entry_alloc_offset(inode);
 412         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 413         /* UniqueID stuff */
 414
 415         brelse(epos.bh);
 416         mark_inode_dirty(inode);
 417         return dbh;
 418 }
 419
 420 static int udf_get_block(struct inode *inode, sector_t block,
 421                          struct buffer_head *bh_result, int create)
 422 {
 423         int err, new;
 424         sector_t phys = 0;
 425         struct udf_inode_info *iinfo;
 426
 427         if (!create) {
 428                 phys = udf_block_map(inode, block);
 429                 if (phys)
 430                         map_bh(bh_result, inode->i_sb, phys);
 431                 return 0;
 432         }
 433
 434         err = -EIO;
 435         new = 0;
 436         iinfo = UDF_I(inode);
 437
 438         down_write(&iinfo->i_data_sem);
 439         if (block == iinfo->i_next_alloc_block + 1) {
 440                 iinfo->i_next_alloc_block++;
 441                 iinfo->i_next_alloc_goal++;
 442         }
 443
 444         /*
 445          * Block beyond EOF and prealloc extents? Just discard preallocation
 446          * as it is not useful and complicates things.
 447          */
 448         if (((loff_t)block) << inode->i_blkbits > iinfo->i_lenExtents)
 449                 udf_discard_prealloc(inode);
 450         udf_clear_extent_cache(inode);
 451         phys = inode_getblk(inode, block, &err, &new);
 452         if (!phys)
 453                 goto abort;
 454
 455         if (new)
 456                 set_buffer_new(bh_result);
 457         map_bh(bh_result, inode->i_sb, phys);
 458
 459 abort:
 460         up_write(&iinfo->i_data_sem);
 461         return err;
 462 }
 463
 464 static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
 465                                       int create, int *err)
 466 {
 467         struct buffer_head *bh;
 468         struct buffer_head dummy;
 469
 470         dummy.b_state = 0;
 471         dummy.b_blocknr = -1000;
 472         *err = udf_get_block(inode, block, &dummy, create);
 473         if (!*err && buffer_mapped(&dummy)) {
 474                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 475                 if (buffer_new(&dummy)) {
 476                         lock_buffer(bh);
 477                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 478                         set_buffer_uptodate(bh);
 479                         unlock_buffer(bh);
 480                         mark_buffer_dirty_inode(bh, inode);
 481                 }
 482                 return bh;
 483         }
 484
 485         return NULL;
 486 }
 487
 488 /* Extend the file with new blocks totaling 'new_block_bytes',
 489  * return the number of extents added
 490  */
 491 static int udf_do_extend_file(struct inode *inode,
 492                               struct extent_position *last_pos,
 493                               struct kernel_long_ad *last_ext,
 494                               loff_t new_block_bytes)
 495 {
 496         uint32_t add;
 497         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 498         struct super_block *sb = inode->i_sb;
 499         struct udf_inode_info *iinfo;
 500         int err;
 501
 502         /* The previous extent is fake and we should not extend by anything
 503          * - there's nothing to do... */
 504         if (!new_block_bytes && fake)
 505                 return 0;
 506
 507         iinfo = UDF_I(inode);
 508         /* Round the last extent up to a multiple of block size */
 509         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 510                 last_ext->extLength =
 511                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 512                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 513                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 514                 iinfo->i_lenExtents =
 515                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 516                         ~(sb->s_blocksize - 1);
 517         }
 518
 519         /* Can we merge with the previous extent? */
 520         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 521                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 522                 add = (1 << 30) - sb->s_blocksize -
 523                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 524                 if (add > new_block_bytes)
 525                         add = new_block_bytes;
 526                 new_block_bytes -= add;
 527                 last_ext->extLength += add;
 528         }
 529
 530         if (fake) {
 531                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 532                                    last_ext->extLength, 1);
 533                 if (err < 0)
 534                         goto out_err;
 535                 count++;
 536         } else {
 537                 struct kernel_lb_addr tmploc;
 538                 uint32_t tmplen;
 539
 540                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 541                                 last_ext->extLength, 1);
 542
 543                 /*
 544                  * We've rewritten the last extent. If we are going to add
 545                  * more extents, we may need to enter possible following
 546                  * empty indirect extent.
 547                  */
 548                 if (new_block_bytes)
 549                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 550         }
 551
 552         /* Managed to do everything necessary? */
 553         if (!new_block_bytes)
 554                 goto out;
 555
 556         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 557         last_ext->extLocation.logicalBlockNum = 0;
 558         last_ext->extLocation.partitionReferenceNum = 0;
 559         add = (1 << 30) - sb->s_blocksize;
 560         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 561
 562         /* Create enough extents to cover the whole hole */
 563         while (new_block_bytes > add) {
 564                 new_block_bytes -= add;
 565                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 566                                    last_ext->extLength, 1);
 567                 if (err)
 568                         goto out_err;
 569                 count++;
 570         }
 571         if (new_block_bytes) {
 572                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 573                         new_block_bytes;
 574                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 575                                    last_ext->extLength, 1);
 576                 if (err)
 577                         goto out_err;
 578                 count++;
 579         }
 580
 581 out:
 582         /* last_pos should point to the last written extent... */
 583         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 584                 last_pos->offset -= sizeof(struct short_ad);
 585         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 586                 last_pos->offset -= sizeof(struct long_ad);
 587         else
 588                 return -EIO;
 589
 590         return count;
 591 out_err:
 592         /* Remove extents we've created so far */
 593         udf_clear_extent_cache(inode);
 594         udf_truncate_extents(inode);
 595         return err;
 596 }
 597
 598 /* Extend the final block of the file to final_block_len bytes */
 599 static void udf_do_extend_final_block(struct inode *inode,
 600                                       struct extent_position *last_pos,
 601                                       struct kernel_long_ad *last_ext,
 602                                       uint32_t new_elen)
 603 {
 604         uint32_t added_bytes;
 605
 606         /*
 607          * Extent already large enough? It may be already rounded up to block
 608          * size...
 609          */
 610         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 611                 return;
 612         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 613         last_ext->extLength += added_bytes;
 614         UDF_I(inode)->i_lenExtents += added_bytes;
 615
 616         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 617                         last_ext->extLength, 1);
 618 }
 619
 620 static int udf_extend_file(struct inode *inode, loff_t newsize)
 621 {
 622
 623         struct extent_position epos;
 624         struct kernel_lb_addr eloc;
 625         uint32_t elen;
 626         int8_t etype;
 627         struct super_block *sb = inode->i_sb;
 628         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 629         loff_t new_elen;
 630         int adsize;
 631         struct udf_inode_info *iinfo = UDF_I(inode);
 632         struct kernel_long_ad extent;
 633         int err = 0;
 634         bool within_last_ext;
 635
 636         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 637                 adsize = sizeof(struct short_ad);
 638         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 639                 adsize = sizeof(struct long_ad);
 640         else
 641                 BUG();
 642
 643         /*
 644          * When creating hole in file, just don't bother with preserving
 645          * preallocation. It likely won't be very useful anyway.
 646          */
 647         udf_discard_prealloc(inode);
 648
 649         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 650         within_last_ext = (etype != -1);
 651         /* We don't expect extents past EOF... */
 652         WARN_ON_ONCE(within_last_ext &&
 653                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 654
 655         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 656             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 657                 /* File has no extents at all or has empty last
 658                  * indirect extent! Create a fake extent... */
 659                 extent.extLocation.logicalBlockNum = 0;
 660                 extent.extLocation.partitionReferenceNum = 0;
 661                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 662         } else {
 663                 epos.offset -= adsize;
 664                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 665                                       &extent.extLength, 0);
 666                 extent.extLength |= etype << 30;
 667         }
 668
 669         new_elen = ((loff_t)offset << inode->i_blkbits) |
 670                                         (newsize & (sb->s_blocksize - 1));
 671
 672         /* File has extent covering the new size (could happen when extending
 673          * inside a block)?
 674          */
 675         if (within_last_ext) {
 676                 /* Extending file within the last file block */
 677                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 678         } else {
 679                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 680         }
 681
 682         if (err < 0)
 683                 goto out;
 684         err = 0;
 685         iinfo->i_lenExtents = newsize;
 686 out:
 687         brelse(epos.bh);
 688         return err;
 689 }
 690
 691 static sector_t inode_getblk(struct inode *inode, sector_t block,
 692                              int *err, int *new)
 693 {
 694         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 695         struct extent_position prev_epos, cur_epos, next_epos;
 696         int count = 0, startnum = 0, endnum = 0;
 697         uint32_t elen = 0, tmpelen;
 698         struct kernel_lb_addr eloc, tmpeloc;
 699         int c = 1;
 700         loff_t lbcount = 0, b_off = 0;
 701         udf_pblk_t newblocknum, newblock = 0;
 702         sector_t offset = 0;
 703         int8_t etype;
 704         struct udf_inode_info *iinfo = UDF_I(inode);
 705         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 706         int lastblock = 0;
 707         bool isBeyondEOF;
 708
 709         *err = 0;
 710         *new = 0;
 711         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 712         prev_epos.block = iinfo->i_location;
 713         prev_epos.bh = NULL;
 714         cur_epos = next_epos = prev_epos;
 715         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 716
 717         /* find the extent which contains the block we are looking for.
 718            alternate between laarr[0] and laarr[1] for locations of the
 719            current extent, and the previous extent */
 720         do {
 721                 if (prev_epos.bh != cur_epos.bh) {
 722                         brelse(prev_epos.bh);
 723                         get_bh(cur_epos.bh);
 724                         prev_epos.bh = cur_epos.bh;
 725                 }
 726                 if (cur_epos.bh != next_epos.bh) {
 727                         brelse(cur_epos.bh);
 728                         get_bh(next_epos.bh);
 729                         cur_epos.bh = next_epos.bh;
 730                 }
 731
 732                 lbcount += elen;
 733
 734                 prev_epos.block = cur_epos.block;
 735                 cur_epos.block = next_epos.block;
 736
 737                 prev_epos.offset = cur_epos.offset;
 738                 cur_epos.offset = next_epos.offset;
 739
 740                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 741                 if (etype == -1)
 742                         break;
 743
 744                 c = !c;
 745
 746                 laarr[c].extLength = (etype << 30) | elen;
 747                 laarr[c].extLocation = eloc;
 748
 749                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 750                         pgoal = eloc.logicalBlockNum +
 751                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 752                                  inode->i_sb->s_blocksize_bits);
 753
 754                 count++;
 755         } while (lbcount + elen <= b_off);
 756
 757         b_off -= lbcount;
 758         offset = b_off >> inode->i_sb->s_blocksize_bits;
 759         /*
 760          * Move prev_epos and cur_epos into indirect extent if we are at
 761          * the pointer to it
 762          */
 763         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 764         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 765
 766         /* if the extent is allocated and recorded, return the block
 767            if the extent is not a multiple of the blocksize, round up */
 768
 769         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 770                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 771                         elen = EXT_RECORDED_ALLOCATED |
 772                                 ((elen + inode->i_sb->s_blocksize - 1) &
 773                                  ~(inode->i_sb->s_blocksize - 1));
 774                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 775                 }
 776                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 777                 goto out_free;
 778         }
 779
 780         /* Are we beyond EOF and preallocated extent? */
 781         if (etype == -1) {
 782                 int ret;
 783                 loff_t hole_len;
 784
 785                 isBeyondEOF = true;
 786                 if (count) {
 787                         if (c)
 788                                 laarr[0] = laarr[1];
 789                         startnum = 1;
 790                 } else {
 791                         /* Create a fake extent when there's not one */
 792                         memset(&laarr[0].extLocation, 0x00,
 793                                 sizeof(struct kernel_lb_addr));
 794                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 795                         /* Will udf_do_extend_file() create real extent from
 796                            a fake one? */
 797                         startnum = (offset > 0);
 798                 }
 799                 /* Create extents for the hole between EOF and offset */
 800                 hole_len = (loff_t)offset << inode->i_blkbits;
 801                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 802                 if (ret < 0) {
 803                         *err = ret;
 804                         goto out_free;
 805                 }
 806                 c = 0;
 807                 offset = 0;
 808                 count += ret;
 809                 /*
 810                  * Is there any real extent? - otherwise we overwrite the fake
 811                  * one...
 812                  */
 813                 if (count)
 814                         c = !c;
 815                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 816                         inode->i_sb->s_blocksize;
 817                 memset(&laarr[c].extLocation, 0x00,
 818                         sizeof(struct kernel_lb_addr));
 819                 count++;
 820                 endnum = c + 1;
 821                 lastblock = 1;
 822         } else {
 823                 isBeyondEOF = false;
 824                 endnum = startnum = ((count > 2) ? 2 : count);
 825
 826                 /* if the current extent is in position 0,
 827                    swap it with the previous */
 828                 if (!c && count != 1) {
 829                         laarr[2] = laarr[0];
 830                         laarr[0] = laarr[1];
 831                         laarr[1] = laarr[2];
 832                         c = 1;
 833                 }
 834
 835                 /* if the current block is located in an extent,
 836                    read the next extent */
 837                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 838                 if (etype != -1) {
 839                         laarr[c + 1].extLength = (etype << 30) | elen;
 840                         laarr[c + 1].extLocation = eloc;
 841                         count++;
 842                         startnum++;
 843                         endnum++;
 844                 } else
 845                         lastblock = 1;
 846         }
 847
 848         /* if the current extent is not recorded but allocated, get the
 849          * block in the extent corresponding to the requested block */
 850         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 851                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 852         else { /* otherwise, allocate a new block */
 853                 if (iinfo->i_next_alloc_block == block)
 854                         goal = iinfo->i_next_alloc_goal;
 855
 856                 if (!goal) {
 857                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 858                                 goal = iinfo->i_location.logicalBlockNum + 1;
 859                 }
 860
 861                 newblocknum = udf_new_block(inode->i_sb, inode,
 862                                 iinfo->i_location.partitionReferenceNum,
 863                                 goal, err);
 864                 if (!newblocknum) {
 865                         *err = -ENOSPC;
 866                         goto out_free;
 867                 }
 868                 if (isBeyondEOF)
 869                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 870         }
 871
 872         /* if the extent the requsted block is located in contains multiple
 873          * blocks, split the extent into at most three extents. blocks prior
 874          * to requested block, requested block, and blocks after requested
 875          * block */
 876         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 877
 878         /* We preallocate blocks only for regular files. It also makes sense
 879          * for directories but there's a problem when to drop the
 880          * preallocation. We might use some delayed work for that but I feel
 881          * it's overengineering for a filesystem like UDF. */
 882         if (S_ISREG(inode->i_mode))
 883                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 884
 885         /* merge any continuous blocks in laarr */
 886         udf_merge_extents(inode, laarr, &endnum);
 887
 888         /* write back the new extents, inserting new extents if the new number
 889          * of extents is greater than the old number, and deleting extents if
 890          * the new number of extents is less than the old number */
 891         *err = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 892         if (*err < 0)
 893                 goto out_free;
 894
 895         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 896                                 iinfo->i_location.partitionReferenceNum, 0);
 897         if (!newblock) {
 898                 *err = -EIO;
 899                 goto out_free;
 900         }
 901         *new = 1;
 902         iinfo->i_next_alloc_block = block;
 903         iinfo->i_next_alloc_goal = newblocknum;
 904         inode->i_ctime = current_time(inode);
 905
 906         if (IS_SYNC(inode))
 907                 udf_sync_inode(inode);
 908         else
 909                 mark_inode_dirty(inode);
 910 out_free:
 911         brelse(prev_epos.bh);
 912         brelse(cur_epos.bh);
 913         brelse(next_epos.bh);
 914         return newblock;
 915 }
 916
 917 static void udf_split_extents(struct inode *inode, int *c, int offset,
 918                                udf_pblk_t newblocknum,
 919                                struct kernel_long_ad *laarr, int *endnum)
 920 {
 921         unsigned long blocksize = inode->i_sb->s_blocksize;
 922         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 923
 924         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 925             (laarr[*c].extLength >> 30) ==
 926                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 927                 int curr = *c;
 928                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 929                             blocksize - 1) >> blocksize_bits;
 930                 int8_t etype = (laarr[curr].extLength >> 30);
 931
 932                 if (blen == 1)
 933                         ;
 934                 else if (!offset || blen == offset + 1) {
 935                         laarr[curr + 2] = laarr[curr + 1];
 936                         laarr[curr + 1] = laarr[curr];
 937                 } else {
 938                         laarr[curr + 3] = laarr[curr + 1];
 939                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 940                 }
 941
 942                 if (offset) {
 943                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 944                                 udf_free_blocks(inode->i_sb, inode,
 945                                                 &laarr[curr].extLocation,
 946                                                 0, offset);
 947                                 laarr[curr].extLength =
 948                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 949                                         (offset << blocksize_bits);
 950                                 laarr[curr].extLocation.logicalBlockNum = 0;
 951                                 laarr[curr].extLocation.
 952                                                 partitionReferenceNum = 0;
 953                         } else
 954                                 laarr[curr].extLength = (etype << 30) |
 955                                         (offset << blocksize_bits);
 956                         curr++;
 957                         (*c)++;
 958                         (*endnum)++;
 959                 }
 960
 961                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 962                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 963                         laarr[curr].extLocation.partitionReferenceNum =
 964                                 UDF_I(inode)->i_location.partitionReferenceNum;
 965                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 966                         blocksize;
 967                 curr++;
 968
 969                 if (blen != offset + 1) {
 970                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 971                                 laarr[curr].extLocation.logicalBlockNum +=
 972                                                                 offset + 1;
 973                         laarr[curr].extLength = (etype << 30) |
 974                                 ((blen - (offset + 1)) << blocksize_bits);
 975                         curr++;
 976                         (*endnum)++;
 977                 }
 978         }
 979 }
 980
 981 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 982                                  struct kernel_long_ad *laarr,
 983                                  int *endnum)
 984 {
 985         int start, length = 0, currlength = 0, i;
 986
 987         if (*endnum >= (c + 1)) {
 988                 if (!lastblock)
 989                         return;
 990                 else
 991                         start = c;
 992         } else {
 993                 if ((laarr[c + 1].extLength >> 30) ==
 994                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 995                         start = c + 1;
 996                         length = currlength =
 997                                 (((laarr[c + 1].extLength &
 998                                         UDF_EXTENT_LENGTH_MASK) +
 999                                 inode->i_sb->s_blocksize - 1) >>
1000                                 inode->i_sb->s_blocksize_bits);
1001                 } else
1002                         start = c;
1003         }
1004
1005         for (i = start + 1; i <= *endnum; i++) {
1006                 if (i == *endnum) {
1007                         if (lastblock)
1008                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1009                 } else if ((laarr[i].extLength >> 30) ==
1010                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1011                         length += (((laarr[i].extLength &
1012                                                 UDF_EXTENT_LENGTH_MASK) +
1013                                     inode->i_sb->s_blocksize - 1) >>
1014                                     inode->i_sb->s_blocksize_bits);
1015                 } else
1016                         break;
1017         }
1018
1019         if (length) {
1020                 int next = laarr[start].extLocation.logicalBlockNum +
1021                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1022                           inode->i_sb->s_blocksize - 1) >>
1023                           inode->i_sb->s_blocksize_bits);
1024                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1025                                 laarr[start].extLocation.partitionReferenceNum,
1026                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1027                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1028                                 currlength);
1029                 if (numalloc)   {
1030                         if (start == (c + 1))
1031                                 laarr[start].extLength +=
1032                                         (numalloc <<
1033                                          inode->i_sb->s_blocksize_bits);
1034                         else {
1035                                 memmove(&laarr[c + 2], &laarr[c + 1],
1036                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1037                                 (*endnum)++;
1038                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1039                                 laarr[c + 1].extLocation.partitionReferenceNum =
1040                                         laarr[c].extLocation.
1041                                                         partitionReferenceNum;
1042                                 laarr[c + 1].extLength =
1043                                         EXT_NOT_RECORDED_ALLOCATED |
1044                                         (numalloc <<
1045                                          inode->i_sb->s_blocksize_bits);
1046                                 start = c + 1;
1047                         }
1048
1049                         for (i = start + 1; numalloc && i < *endnum; i++) {
1050                                 int elen = ((laarr[i].extLength &
1051                                                 UDF_EXTENT_LENGTH_MASK) +
1052                                             inode->i_sb->s_blocksize - 1) >>
1053                                             inode->i_sb->s_blocksize_bits;
1054
1055                                 if (elen > numalloc) {
1056                                         laarr[i].extLength -=
1057                                                 (numalloc <<
1058                                                  inode->i_sb->s_blocksize_bits);
1059                                         numalloc = 0;
1060                                 } else {
1061                                         numalloc -= elen;
1062                                         if (*endnum > (i + 1))
1063                                                 memmove(&laarr[i],
1064                                                         &laarr[i + 1],
1065                                                         sizeof(struct long_ad) *
1066                                                         (*endnum - (i + 1)));
1067                                         i--;
1068                                         (*endnum)--;
1069                                 }
1070                         }
1071                         UDF_I(inode)->i_lenExtents +=
1072                                 numalloc << inode->i_sb->s_blocksize_bits;
1073                 }
1074         }
1075 }
1076
1077 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1078                               int *endnum)
1079 {
1080         int i;
1081         unsigned long blocksize = inode->i_sb->s_blocksize;
1082         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1083
1084         for (i = 0; i < (*endnum - 1); i++) {
1085                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1086                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1087
1088                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1089                         (((li->extLength >> 30) ==
1090                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1091                         ((lip1->extLocation.logicalBlockNum -
1092                           li->extLocation.logicalBlockNum) ==
1093                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1094                         blocksize - 1) >> blocksize_bits)))) {
1095
1096                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1097                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1098                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1099                                 li->extLength = lip1->extLength +
1100                                         (((li->extLength &
1101                                                 UDF_EXTENT_LENGTH_MASK) +
1102                                          blocksize - 1) & ~(blocksize - 1));
1103                                 if (*endnum > (i + 2))
1104                                         memmove(&laarr[i + 1], &laarr[i + 2],
1105                                                 sizeof(struct long_ad) *
1106                                                 (*endnum - (i + 2)));
1107                                 i--;
1108                                 (*endnum)--;
1109                         }
1110                 } else if (((li->extLength >> 30) ==
1111                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1112                            ((lip1->extLength >> 30) ==
1113                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1114                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1115                                         ((li->extLength &
1116                                           UDF_EXTENT_LENGTH_MASK) +
1117                                          blocksize - 1) >> blocksize_bits);
1118                         li->extLocation.logicalBlockNum = 0;
1119                         li->extLocation.partitionReferenceNum = 0;
1120
1121                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1122                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1123                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1124                                 lip1->extLength = (lip1->extLength -
1125                                                    (li->extLength &
1126                                                    UDF_EXTENT_LENGTH_MASK) +
1127                                                    UDF_EXTENT_LENGTH_MASK) &
1128                                                    ~(blocksize - 1);
1129                                 li->extLength = (li->extLength &
1130                                                  UDF_EXTENT_FLAG_MASK) +
1131                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1132                                                 blocksize;
1133                         } else {
1134                                 li->extLength = lip1->extLength +
1135                                         (((li->extLength &
1136                                                 UDF_EXTENT_LENGTH_MASK) +
1137                                           blocksize - 1) & ~(blocksize - 1));
1138                                 if (*endnum > (i + 2))
1139                                         memmove(&laarr[i + 1], &laarr[i + 2],
1140                                                 sizeof(struct long_ad) *
1141                                                 (*endnum - (i + 2)));
1142                                 i--;
1143                                 (*endnum)--;
1144                         }
1145                 } else if ((li->extLength >> 30) ==
1146                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1147                         udf_free_blocks(inode->i_sb, inode,
1148                                         &li->extLocation, 0,
1149                                         ((li->extLength &
1150                                                 UDF_EXTENT_LENGTH_MASK) +
1151                                          blocksize - 1) >> blocksize_bits);
1152                         li->extLocation.logicalBlockNum = 0;
1153                         li->extLocation.partitionReferenceNum = 0;
1154                         li->extLength = (li->extLength &
1155                                                 UDF_EXTENT_LENGTH_MASK) |
1156                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1157                 }
1158         }
1159 }
1160
1161 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
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         int err;
1169
1170         if (startnum > endnum) {
1171                 for (i = 0; i < (startnum - endnum); i++)
1172                         udf_delete_aext(inode, *epos);
1173         } else if (startnum < endnum) {
1174                 for (i = 0; i < (endnum - startnum); i++) {
1175                         err = udf_insert_aext(inode, *epos,
1176                                               laarr[i].extLocation,
1177                                               laarr[i].extLength);
1178                         /*
1179                          * If we fail here, we are likely corrupting the extent
1180                          * list and leaking blocks. At least stop early to
1181                          * limit the damage.
1182                          */
1183                         if (err < 0)
1184                                 return err;
1185                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1186                                       &laarr[i].extLength, 1);
1187                         start++;
1188                 }
1189         }
1190
1191         for (i = start; i < endnum; i++) {
1192                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1193                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1194                                laarr[i].extLength, 1);
1195         }
1196         return 0;
1197 }
1198
1199 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1200                               int create, int *err)
1201 {
1202         struct buffer_head *bh = NULL;
1203
1204         bh = udf_getblk(inode, block, create, err);
1205         if (!bh)
1206                 return NULL;
1207
1208         if (buffer_uptodate(bh))
1209                 return bh;
1210
1211         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1212
1213         wait_on_buffer(bh);
1214         if (buffer_uptodate(bh))
1215                 return bh;
1216
1217         brelse(bh);
1218         *err = -EIO;
1219         return NULL;
1220 }
1221
1222 int udf_setsize(struct inode *inode, loff_t newsize)
1223 {
1224         int err;
1225         struct udf_inode_info *iinfo;
1226         unsigned int bsize = i_blocksize(inode);
1227
1228         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1229               S_ISLNK(inode->i_mode)))
1230                 return -EINVAL;
1231         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1232                 return -EPERM;
1233
1234         iinfo = UDF_I(inode);
1235         if (newsize > inode->i_size) {
1236                 down_write(&iinfo->i_data_sem);
1237                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1238                         if (bsize <
1239                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1240                                 err = udf_expand_file_adinicb(inode);
1241                                 if (err)
1242                                         return err;
1243                                 down_write(&iinfo->i_data_sem);
1244                         } else {
1245                                 iinfo->i_lenAlloc = newsize;
1246                                 goto set_size;
1247                         }
1248                 }
1249                 err = udf_extend_file(inode, newsize);
1250                 if (err) {
1251                         up_write(&iinfo->i_data_sem);
1252                         return err;
1253                 }
1254 set_size:
1255                 up_write(&iinfo->i_data_sem);
1256                 truncate_setsize(inode, newsize);
1257         } else {
1258                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1259                         down_write(&iinfo->i_data_sem);
1260                         udf_clear_extent_cache(inode);
1261                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1262                                0x00, bsize - newsize -
1263                                udf_file_entry_alloc_offset(inode));
1264                         iinfo->i_lenAlloc = newsize;
1265                         truncate_setsize(inode, newsize);
1266                         up_write(&iinfo->i_data_sem);
1267                         goto update_time;
1268                 }
1269                 err = block_truncate_page(inode->i_mapping, newsize,
1270                                           udf_get_block);
1271                 if (err)
1272                         return err;
1273                 truncate_setsize(inode, newsize);
1274                 down_write(&iinfo->i_data_sem);
1275                 udf_clear_extent_cache(inode);
1276                 err = udf_truncate_extents(inode);
1277                 up_write(&iinfo->i_data_sem);
1278                 if (err)
1279                         return err;
1280         }
1281 update_time:
1282         inode->i_mtime = inode->i_ctime = current_time(inode);
1283         if (IS_SYNC(inode))
1284                 udf_sync_inode(inode);
1285         else
1286                 mark_inode_dirty(inode);
1287         return 0;
1288 }
1289
1290 /*
1291  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1292  * arbitrary - just that we hopefully don't limit any real use of rewritten
1293  * inode on write-once media but avoid looping for too long on corrupted media.
1294  */
1295 #define UDF_MAX_ICB_NESTING 1024
1296
1297 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1298 {
1299         struct buffer_head *bh = NULL;
1300         struct fileEntry *fe;
1301         struct extendedFileEntry *efe;
1302         uint16_t ident;
1303         struct udf_inode_info *iinfo = UDF_I(inode);
1304         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1305         struct kernel_lb_addr *iloc = &iinfo->i_location;
1306         unsigned int link_count;
1307         unsigned int indirections = 0;
1308         int bs = inode->i_sb->s_blocksize;
1309         int ret = -EIO;
1310         uint32_t uid, gid;
1311
1312 reread:
1313         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1314                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1315                           iloc->partitionReferenceNum, sbi->s_partitions);
1316                 return -EIO;
1317         }
1318
1319         if (iloc->logicalBlockNum >=
1320             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1321                 udf_debug("block=%u, partition=%u out of range\n",
1322                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1323                 return -EIO;
1324         }
1325
1326         /*
1327          * Set defaults, but the inode is still incomplete!
1328          * Note: get_new_inode() sets the following on a new inode:
1329          *      i_sb = sb
1330          *      i_no = ino
1331          *      i_flags = sb->s_flags
1332          *      i_state = 0
1333          * clean_inode(): zero fills and sets
1334          *      i_count = 1
1335          *      i_nlink = 1
1336          *      i_op = NULL;
1337          */
1338         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1339         if (!bh) {
1340                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1341                 return -EIO;
1342         }
1343
1344         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1345             ident != TAG_IDENT_USE) {
1346                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1347                         inode->i_ino, ident);
1348                 goto out;
1349         }
1350
1351         fe = (struct fileEntry *)bh->b_data;
1352         efe = (struct extendedFileEntry *)bh->b_data;
1353
1354         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1355                 struct buffer_head *ibh;
1356
1357                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1358                 if (ident == TAG_IDENT_IE && ibh) {
1359                         struct kernel_lb_addr loc;
1360                         struct indirectEntry *ie;
1361
1362                         ie = (struct indirectEntry *)ibh->b_data;
1363                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1364
1365                         if (ie->indirectICB.extLength) {
1366                                 brelse(ibh);
1367                                 memcpy(&iinfo->i_location, &loc,
1368                                        sizeof(struct kernel_lb_addr));
1369                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1370                                         udf_err(inode->i_sb,
1371                                                 "too many ICBs in ICB hierarchy"
1372                                                 " (max %d supported)\n",
1373                                                 UDF_MAX_ICB_NESTING);
1374                                         goto out;
1375                                 }
1376                                 brelse(bh);
1377                                 goto reread;
1378                         }
1379                 }
1380                 brelse(ibh);
1381         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1382                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1383                         le16_to_cpu(fe->icbTag.strategyType));
1384                 goto out;
1385         }
1386         if (fe->icbTag.strategyType == cpu_to_le16(4))
1387                 iinfo->i_strat4096 = 0;
1388         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1389                 iinfo->i_strat4096 = 1;
1390
1391         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1392                                                         ICBTAG_FLAG_AD_MASK;
1393         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1394             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1395             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1396                 ret = -EIO;
1397                 goto out;
1398         }
1399         iinfo->i_hidden = hidden_inode;
1400         iinfo->i_unique = 0;
1401         iinfo->i_lenEAttr = 0;
1402         iinfo->i_lenExtents = 0;
1403         iinfo->i_lenAlloc = 0;
1404         iinfo->i_next_alloc_block = 0;
1405         iinfo->i_next_alloc_goal = 0;
1406         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1407                 iinfo->i_efe = 1;
1408                 iinfo->i_use = 0;
1409                 ret = udf_alloc_i_data(inode, bs -
1410                                         sizeof(struct extendedFileEntry));
1411                 if (ret)
1412                         goto out;
1413                 memcpy(iinfo->i_ext.i_data,
1414                        bh->b_data + sizeof(struct extendedFileEntry),
1415                        bs - sizeof(struct extendedFileEntry));
1416         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1417                 iinfo->i_efe = 0;
1418                 iinfo->i_use = 0;
1419                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1420                 if (ret)
1421                         goto out;
1422                 memcpy(iinfo->i_ext.i_data,
1423                        bh->b_data + sizeof(struct fileEntry),
1424                        bs - sizeof(struct fileEntry));
1425         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1426                 iinfo->i_efe = 0;
1427                 iinfo->i_use = 1;
1428                 iinfo->i_lenAlloc = le32_to_cpu(
1429                                 ((struct unallocSpaceEntry *)bh->b_data)->
1430                                  lengthAllocDescs);
1431                 ret = udf_alloc_i_data(inode, bs -
1432                                         sizeof(struct unallocSpaceEntry));
1433                 if (ret)
1434                         goto out;
1435                 memcpy(iinfo->i_ext.i_data,
1436                        bh->b_data + sizeof(struct unallocSpaceEntry),
1437                        bs - sizeof(struct unallocSpaceEntry));
1438                 return 0;
1439         }
1440
1441         ret = -EIO;
1442         read_lock(&sbi->s_cred_lock);
1443         uid = le32_to_cpu(fe->uid);
1444         if (uid == UDF_INVALID_ID ||
1445             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1446                 inode->i_uid = sbi->s_uid;
1447         else
1448                 i_uid_write(inode, uid);
1449
1450         gid = le32_to_cpu(fe->gid);
1451         if (gid == UDF_INVALID_ID ||
1452             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1453                 inode->i_gid = sbi->s_gid;
1454         else
1455                 i_gid_write(inode, gid);
1456
1457         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1458                         sbi->s_fmode != UDF_INVALID_MODE)
1459                 inode->i_mode = sbi->s_fmode;
1460         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1461                         sbi->s_dmode != UDF_INVALID_MODE)
1462                 inode->i_mode = sbi->s_dmode;
1463         else
1464                 inode->i_mode = udf_convert_permissions(fe);
1465         inode->i_mode &= ~sbi->s_umask;
1466         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1467
1468         read_unlock(&sbi->s_cred_lock);
1469
1470         link_count = le16_to_cpu(fe->fileLinkCount);
1471         if (!link_count) {
1472                 if (!hidden_inode) {
1473                         ret = -ESTALE;
1474                         goto out;
1475                 }
1476                 link_count = 1;
1477         }
1478         set_nlink(inode, link_count);
1479
1480         inode->i_size = le64_to_cpu(fe->informationLength);
1481         iinfo->i_lenExtents = inode->i_size;
1482
1483         if (iinfo->i_efe == 0) {
1484                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1485                         (inode->i_sb->s_blocksize_bits - 9);
1486
1487                 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1488                 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1489                 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1490
1491                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1492                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1493                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1494                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1495                 iinfo->i_streamdir = 0;
1496                 iinfo->i_lenStreams = 0;
1497         } else {
1498                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1499                     (inode->i_sb->s_blocksize_bits - 9);
1500
1501                 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1502                 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1503                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1504                 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1505
1506                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1507                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1508                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1509                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1510
1511                 /* Named streams */
1512                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1513                 iinfo->i_locStreamdir =
1514                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1515                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1516                 if (iinfo->i_lenStreams >= inode->i_size)
1517                         iinfo->i_lenStreams -= inode->i_size;
1518                 else
1519                         iinfo->i_lenStreams = 0;
1520         }
1521         inode->i_generation = iinfo->i_unique;
1522
1523         /*
1524          * Sanity check length of allocation descriptors and extended attrs to
1525          * avoid integer overflows
1526          */
1527         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1528                 goto out;
1529         /* Now do exact checks */
1530         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1531                 goto out;
1532         /* Sanity checks for files in ICB so that we don't get confused later */
1533         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1534                 /*
1535                  * For file in ICB data is stored in allocation descriptor
1536                  * so sizes should match
1537                  */
1538                 if (iinfo->i_lenAlloc != inode->i_size)
1539                         goto out;
1540                 /* File in ICB has to fit in there... */
1541                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1542                         goto out;
1543         }
1544
1545         switch (fe->icbTag.fileType) {
1546         case ICBTAG_FILE_TYPE_DIRECTORY:
1547                 inode->i_op = &udf_dir_inode_operations;
1548                 inode->i_fop = &udf_dir_operations;
1549                 inode->i_mode |= S_IFDIR;
1550                 inc_nlink(inode);
1551                 break;
1552         case ICBTAG_FILE_TYPE_REALTIME:
1553         case ICBTAG_FILE_TYPE_REGULAR:
1554         case ICBTAG_FILE_TYPE_UNDEF:
1555         case ICBTAG_FILE_TYPE_VAT20:
1556                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1557                         inode->i_data.a_ops = &udf_adinicb_aops;
1558                 else
1559                         inode->i_data.a_ops = &udf_aops;
1560                 inode->i_op = &udf_file_inode_operations;
1561                 inode->i_fop = &udf_file_operations;
1562                 inode->i_mode |= S_IFREG;
1563                 break;
1564         case ICBTAG_FILE_TYPE_BLOCK:
1565                 inode->i_mode |= S_IFBLK;
1566                 break;
1567         case ICBTAG_FILE_TYPE_CHAR:
1568                 inode->i_mode |= S_IFCHR;
1569                 break;
1570         case ICBTAG_FILE_TYPE_FIFO:
1571                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1572                 break;
1573         case ICBTAG_FILE_TYPE_SOCKET:
1574                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1575                 break;
1576         case ICBTAG_FILE_TYPE_SYMLINK:
1577                 inode->i_data.a_ops = &udf_symlink_aops;
1578                 inode->i_op = &udf_symlink_inode_operations;
1579                 inode_nohighmem(inode);
1580                 inode->i_mode = S_IFLNK | 0777;
1581                 break;
1582         case ICBTAG_FILE_TYPE_MAIN:
1583                 udf_debug("METADATA FILE-----\n");
1584                 break;
1585         case ICBTAG_FILE_TYPE_MIRROR:
1586                 udf_debug("METADATA MIRROR FILE-----\n");
1587                 break;
1588         case ICBTAG_FILE_TYPE_BITMAP:
1589                 udf_debug("METADATA BITMAP FILE-----\n");
1590                 break;
1591         default:
1592                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1593                         inode->i_ino, fe->icbTag.fileType);
1594                 goto out;
1595         }
1596         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1597                 struct deviceSpec *dsea =
1598                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1599                 if (dsea) {
1600                         init_special_inode(inode, inode->i_mode,
1601                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1602                                       le32_to_cpu(dsea->minorDeviceIdent)));
1603                         /* Developer ID ??? */
1604                 } else
1605                         goto out;
1606         }
1607         ret = 0;
1608 out:
1609         brelse(bh);
1610         return ret;
1611 }
1612
1613 static int udf_alloc_i_data(struct inode *inode, size_t size)
1614 {
1615         struct udf_inode_info *iinfo = UDF_I(inode);
1616         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1617         if (!iinfo->i_ext.i_data)
1618                 return -ENOMEM;
1619         return 0;
1620 }
1621
1622 static umode_t udf_convert_permissions(struct fileEntry *fe)
1623 {
1624         umode_t mode;
1625         uint32_t permissions;
1626         uint32_t flags;
1627
1628         permissions = le32_to_cpu(fe->permissions);
1629         flags = le16_to_cpu(fe->icbTag.flags);
1630
1631         mode =  ((permissions) & 0007) |
1632                 ((permissions >> 2) & 0070) |
1633                 ((permissions >> 4) & 0700) |
1634                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1635                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1636                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1637
1638         return mode;
1639 }
1640
1641 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1642 {
1643         struct udf_inode_info *iinfo = UDF_I(inode);
1644
1645         /*
1646          * UDF 2.01 sec. 3.3.3.3 Note 2:
1647          * In Unix, delete permission tracks write
1648          */
1649         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1650         if (mode & 0200)
1651                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1652         if (mode & 0020)
1653                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1654         if (mode & 0002)
1655                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1656 }
1657
1658 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1659 {
1660         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1661 }
1662
1663 static int udf_sync_inode(struct inode *inode)
1664 {
1665         return udf_update_inode(inode, 1);
1666 }
1667
1668 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1669 {
1670         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1671             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1672              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1673                 iinfo->i_crtime = time;
1674 }
1675
1676 static int udf_update_inode(struct inode *inode, int do_sync)
1677 {
1678         struct buffer_head *bh = NULL;
1679         struct fileEntry *fe;
1680         struct extendedFileEntry *efe;
1681         uint64_t lb_recorded;
1682         uint32_t udfperms;
1683         uint16_t icbflags;
1684         uint16_t crclen;
1685         int err = 0;
1686         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1687         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1688         struct udf_inode_info *iinfo = UDF_I(inode);
1689
1690         bh = udf_tgetblk(inode->i_sb,
1691                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1692         if (!bh) {
1693                 udf_debug("getblk failure\n");
1694                 return -EIO;
1695         }
1696
1697         lock_buffer(bh);
1698         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1699         fe = (struct fileEntry *)bh->b_data;
1700         efe = (struct extendedFileEntry *)bh->b_data;
1701
1702         if (iinfo->i_use) {
1703                 struct unallocSpaceEntry *use =
1704                         (struct unallocSpaceEntry *)bh->b_data;
1705
1706                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1707                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1708                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1709                                         sizeof(struct unallocSpaceEntry));
1710                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1711                 crclen = sizeof(struct unallocSpaceEntry);
1712
1713                 goto finish;
1714         }
1715
1716         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1717                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1718         else
1719                 fe->uid = cpu_to_le32(i_uid_read(inode));
1720
1721         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1722                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1723         else
1724                 fe->gid = cpu_to_le32(i_gid_read(inode));
1725
1726         udfperms = ((inode->i_mode & 0007)) |
1727                    ((inode->i_mode & 0070) << 2) |
1728                    ((inode->i_mode & 0700) << 4);
1729
1730         udfperms |= iinfo->i_extraPerms;
1731         fe->permissions = cpu_to_le32(udfperms);
1732
1733         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1734                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1735         else {
1736                 if (iinfo->i_hidden)
1737                         fe->fileLinkCount = cpu_to_le16(0);
1738                 else
1739                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1740         }
1741
1742         fe->informationLength = cpu_to_le64(inode->i_size);
1743
1744         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1745                 struct regid *eid;
1746                 struct deviceSpec *dsea =
1747                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1748                 if (!dsea) {
1749                         dsea = (struct deviceSpec *)
1750                                 udf_add_extendedattr(inode,
1751                                                      sizeof(struct deviceSpec) +
1752                                                      sizeof(struct regid), 12, 0x3);
1753                         dsea->attrType = cpu_to_le32(12);
1754                         dsea->attrSubtype = 1;
1755                         dsea->attrLength = cpu_to_le32(
1756                                                 sizeof(struct deviceSpec) +
1757                                                 sizeof(struct regid));
1758                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1759                 }
1760                 eid = (struct regid *)dsea->impUse;
1761                 memset(eid, 0, sizeof(*eid));
1762                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1763                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1764                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1765                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1766                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1767         }
1768
1769         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1770                 lb_recorded = 0; /* No extents => no blocks! */
1771         else
1772                 lb_recorded =
1773                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1774                         (blocksize_bits - 9);
1775
1776         if (iinfo->i_efe == 0) {
1777                 memcpy(bh->b_data + sizeof(struct fileEntry),
1778                        iinfo->i_ext.i_data,
1779                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1780                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1781
1782                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1783                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1784                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1785                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1786                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1787                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1788                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1789                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1790                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1791                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1792                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1793                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1794                 crclen = sizeof(struct fileEntry);
1795         } else {
1796                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1797                        iinfo->i_ext.i_data,
1798                        inode->i_sb->s_blocksize -
1799                                         sizeof(struct extendedFileEntry));
1800                 efe->objectSize =
1801                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1802                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1803
1804                 if (iinfo->i_streamdir) {
1805                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1806
1807                         icb_lad->extLocation =
1808                                 cpu_to_lelb(iinfo->i_locStreamdir);
1809                         icb_lad->extLength =
1810                                 cpu_to_le32(inode->i_sb->s_blocksize);
1811                 }
1812
1813                 udf_adjust_time(iinfo, inode->i_atime);
1814                 udf_adjust_time(iinfo, inode->i_mtime);
1815                 udf_adjust_time(iinfo, inode->i_ctime);
1816
1817                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1818                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1819                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1820                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1821
1822                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1823                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1824                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1825                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1826                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1827                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1828                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1829                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1830                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1831                 crclen = sizeof(struct extendedFileEntry);
1832         }
1833
1834 finish:
1835         if (iinfo->i_strat4096) {
1836                 fe->icbTag.strategyType = cpu_to_le16(4096);
1837                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1838                 fe->icbTag.numEntries = cpu_to_le16(2);
1839         } else {
1840                 fe->icbTag.strategyType = cpu_to_le16(4);
1841                 fe->icbTag.numEntries = cpu_to_le16(1);
1842         }
1843
1844         if (iinfo->i_use)
1845                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1846         else if (S_ISDIR(inode->i_mode))
1847                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1848         else if (S_ISREG(inode->i_mode))
1849                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1850         else if (S_ISLNK(inode->i_mode))
1851                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1852         else if (S_ISBLK(inode->i_mode))
1853                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1854         else if (S_ISCHR(inode->i_mode))
1855                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1856         else if (S_ISFIFO(inode->i_mode))
1857                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1858         else if (S_ISSOCK(inode->i_mode))
1859                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1860
1861         icbflags =      iinfo->i_alloc_type |
1862                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1863                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1864                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1865                         (le16_to_cpu(fe->icbTag.flags) &
1866                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1867                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1868
1869         fe->icbTag.flags = cpu_to_le16(icbflags);
1870         if (sbi->s_udfrev >= 0x0200)
1871                 fe->descTag.descVersion = cpu_to_le16(3);
1872         else
1873                 fe->descTag.descVersion = cpu_to_le16(2);
1874         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1875         fe->descTag.tagLocation = cpu_to_le32(
1876                                         iinfo->i_location.logicalBlockNum);
1877         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1878         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1879         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1880                                                   crclen));
1881         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1882
1883         set_buffer_uptodate(bh);
1884         unlock_buffer(bh);
1885
1886         /* write the data blocks */
1887         mark_buffer_dirty(bh);
1888         if (do_sync) {
1889                 sync_dirty_buffer(bh);
1890                 if (buffer_write_io_error(bh)) {
1891                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1892                                  inode->i_ino);
1893                         err = -EIO;
1894                 }
1895         }
1896         brelse(bh);
1897
1898         return err;
1899 }
1900
1901 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1902                          bool hidden_inode)
1903 {
1904         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1905         struct inode *inode = iget_locked(sb, block);
1906         int err;
1907
1908         if (!inode)
1909                 return ERR_PTR(-ENOMEM);
1910
1911         if (!(inode->i_state & I_NEW)) {
1912                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1913                         iput(inode);
1914                         return ERR_PTR(-EFSCORRUPTED);
1915                 }
1916                 return inode;
1917         }
1918
1919         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1920         err = udf_read_inode(inode, hidden_inode);
1921         if (err < 0) {
1922                 iget_failed(inode);
1923                 return ERR_PTR(err);
1924         }
1925         unlock_new_inode(inode);
1926
1927         return inode;
1928 }
1929
1930 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1931                             struct extent_position *epos)
1932 {
1933         struct super_block *sb = inode->i_sb;
1934         struct buffer_head *bh;
1935         struct allocExtDesc *aed;
1936         struct extent_position nepos;
1937         struct kernel_lb_addr neloc;
1938         int ver, adsize;
1939
1940         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1941                 adsize = sizeof(struct short_ad);
1942         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1943                 adsize = sizeof(struct long_ad);
1944         else
1945                 return -EIO;
1946
1947         neloc.logicalBlockNum = block;
1948         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1949
1950         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1951         if (!bh)
1952                 return -EIO;
1953         lock_buffer(bh);
1954         memset(bh->b_data, 0x00, sb->s_blocksize);
1955         set_buffer_uptodate(bh);
1956         unlock_buffer(bh);
1957         mark_buffer_dirty_inode(bh, inode);
1958
1959         aed = (struct allocExtDesc *)(bh->b_data);
1960         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1961                 aed->previousAllocExtLocation =
1962                                 cpu_to_le32(epos->block.logicalBlockNum);
1963         }
1964         aed->lengthAllocDescs = cpu_to_le32(0);
1965         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1966                 ver = 3;
1967         else
1968                 ver = 2;
1969         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1970                     sizeof(struct tag));
1971
1972         nepos.block = neloc;
1973         nepos.offset = sizeof(struct allocExtDesc);
1974         nepos.bh = bh;
1975
1976         /*
1977          * Do we have to copy current last extent to make space for indirect
1978          * one?
1979          */
1980         if (epos->offset + adsize > sb->s_blocksize) {
1981                 struct kernel_lb_addr cp_loc;
1982                 uint32_t cp_len;
1983                 int cp_type;
1984
1985                 epos->offset -= adsize;
1986                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1987                 cp_len |= ((uint32_t)cp_type) << 30;
1988
1989                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1990                 udf_write_aext(inode, epos, &nepos.block,
1991                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1992         } else {
1993                 __udf_add_aext(inode, epos, &nepos.block,
1994                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDECS, 0);
1995         }
1996
1997         brelse(epos->bh);
1998         *epos = nepos;
1999
2000         return 0;
2001 }
2002
2003 /*
2004  * Append extent at the given position - should be the first free one in inode
2005  * / indirect extent. This function assumes there is enough space in the inode
2006  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
2007  */
2008 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2009                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2010 {
2011         struct udf_inode_info *iinfo = UDF_I(inode);
2012         struct allocExtDesc *aed;
2013         int adsize;
2014
2015         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2016                 adsize = sizeof(struct short_ad);
2017         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2018                 adsize = sizeof(struct long_ad);
2019         else
2020                 return -EIO;
2021
2022         if (!epos->bh) {
2023                 WARN_ON(iinfo->i_lenAlloc !=
2024                         epos->offset - udf_file_entry_alloc_offset(inode));
2025         } else {
2026                 aed = (struct allocExtDesc *)epos->bh->b_data;
2027                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2028                         epos->offset - sizeof(struct allocExtDesc));
2029                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2030         }
2031
2032         udf_write_aext(inode, epos, eloc, elen, inc);
2033
2034         if (!epos->bh) {
2035                 iinfo->i_lenAlloc += adsize;
2036                 mark_inode_dirty(inode);
2037         } else {
2038                 aed = (struct allocExtDesc *)epos->bh->b_data;
2039                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2040                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2041                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2042                         udf_update_tag(epos->bh->b_data,
2043                                         epos->offset + (inc ? 0 : adsize));
2044                 else
2045                         udf_update_tag(epos->bh->b_data,
2046                                         sizeof(struct allocExtDesc));
2047                 mark_buffer_dirty_inode(epos->bh, inode);
2048         }
2049
2050         return 0;
2051 }
2052
2053 /*
2054  * Append extent at given position - should be the first free one in inode
2055  * / indirect extent. Takes care of allocating and linking indirect blocks.
2056  */
2057 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2058                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2059 {
2060         int adsize;
2061         struct super_block *sb = inode->i_sb;
2062
2063         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2064                 adsize = sizeof(struct short_ad);
2065         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2066                 adsize = sizeof(struct long_ad);
2067         else
2068                 return -EIO;
2069
2070         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2071                 int err;
2072                 udf_pblk_t new_block;
2073
2074                 new_block = udf_new_block(sb, NULL,
2075                                           epos->block.partitionReferenceNum,
2076                                           epos->block.logicalBlockNum, &err);
2077                 if (!new_block)
2078                         return -ENOSPC;
2079
2080                 err = udf_setup_indirect_aext(inode, new_block, epos);
2081                 if (err)
2082                         return err;
2083         }
2084
2085         return __udf_add_aext(inode, epos, eloc, elen, inc);
2086 }
2087
2088 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2089                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2090 {
2091         int adsize;
2092         uint8_t *ptr;
2093         struct short_ad *sad;
2094         struct long_ad *lad;
2095         struct udf_inode_info *iinfo = UDF_I(inode);
2096
2097         if (!epos->bh)
2098                 ptr = iinfo->i_ext.i_data + epos->offset -
2099                         udf_file_entry_alloc_offset(inode) +
2100                         iinfo->i_lenEAttr;
2101         else
2102                 ptr = epos->bh->b_data + epos->offset;
2103
2104         switch (iinfo->i_alloc_type) {
2105         case ICBTAG_FLAG_AD_SHORT:
2106                 sad = (struct short_ad *)ptr;
2107                 sad->extLength = cpu_to_le32(elen);
2108                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2109                 adsize = sizeof(struct short_ad);
2110                 break;
2111         case ICBTAG_FLAG_AD_LONG:
2112                 lad = (struct long_ad *)ptr;
2113                 lad->extLength = cpu_to_le32(elen);
2114                 lad->extLocation = cpu_to_lelb(*eloc);
2115                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2116                 adsize = sizeof(struct long_ad);
2117                 break;
2118         default:
2119                 return;
2120         }
2121
2122         if (epos->bh) {
2123                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2124                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2125                         struct allocExtDesc *aed =
2126                                 (struct allocExtDesc *)epos->bh->b_data;
2127                         udf_update_tag(epos->bh->b_data,
2128                                        le32_to_cpu(aed->lengthAllocDescs) +
2129                                        sizeof(struct allocExtDesc));
2130                 }
2131                 mark_buffer_dirty_inode(epos->bh, inode);
2132         } else {
2133                 mark_inode_dirty(inode);
2134         }
2135
2136         if (inc)
2137                 epos->offset += adsize;
2138 }
2139
2140 /*
2141  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2142  * someone does some weird stuff.
2143  */
2144 #define UDF_MAX_INDIR_EXTS 16
2145
2146 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2147                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2148 {
2149         int8_t etype;
2150         unsigned int indirections = 0;
2151
2152         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2153                (EXT_NEXT_EXTENT_ALLOCDECS >> 30)) {
2154                 udf_pblk_t block;
2155
2156                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2157                         udf_err(inode->i_sb,
2158                                 "too many indirect extents in inode %lu\n",
2159                                 inode->i_ino);
2160                         return -1;
2161                 }
2162
2163                 epos->block = *eloc;
2164                 epos->offset = sizeof(struct allocExtDesc);
2165                 brelse(epos->bh);
2166                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2167                 epos->bh = udf_tread(inode->i_sb, block);
2168                 if (!epos->bh) {
2169                         udf_debug("reading block %u failed!\n", block);
2170                         return -1;
2171                 }
2172         }
2173
2174         return etype;
2175 }
2176
2177 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2178                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2179 {
2180         int alen;
2181         int8_t etype;
2182         uint8_t *ptr;
2183         struct short_ad *sad;
2184         struct long_ad *lad;
2185         struct udf_inode_info *iinfo = UDF_I(inode);
2186
2187         if (!epos->bh) {
2188                 if (!epos->offset)
2189                         epos->offset = udf_file_entry_alloc_offset(inode);
2190                 ptr = iinfo->i_ext.i_data + epos->offset -
2191                         udf_file_entry_alloc_offset(inode) +
2192                         iinfo->i_lenEAttr;
2193                 alen = udf_file_entry_alloc_offset(inode) +
2194                                                         iinfo->i_lenAlloc;
2195         } else {
2196                 if (!epos->offset)
2197                         epos->offset = sizeof(struct allocExtDesc);
2198                 ptr = epos->bh->b_data + epos->offset;
2199                 alen = sizeof(struct allocExtDesc) +
2200                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2201                                                         lengthAllocDescs);
2202         }
2203
2204         switch (iinfo->i_alloc_type) {
2205         case ICBTAG_FLAG_AD_SHORT:
2206                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2207                 if (!sad)
2208                         return -1;
2209                 etype = le32_to_cpu(sad->extLength) >> 30;
2210                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2211                 eloc->partitionReferenceNum =
2212                                 iinfo->i_location.partitionReferenceNum;
2213                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2214                 break;
2215         case ICBTAG_FLAG_AD_LONG:
2216                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2217                 if (!lad)
2218                         return -1;
2219                 etype = le32_to_cpu(lad->extLength) >> 30;
2220                 *eloc = lelb_to_cpu(lad->extLocation);
2221                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2222                 break;
2223         default:
2224                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2225                 return -1;
2226         }
2227
2228         return etype;
2229 }
2230
2231 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2232                            struct kernel_lb_addr neloc, uint32_t nelen)
2233 {
2234         struct kernel_lb_addr oeloc;
2235         uint32_t oelen;
2236         int8_t etype;
2237         int err;
2238
2239         if (epos.bh)
2240                 get_bh(epos.bh);
2241
2242         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2243                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2244                 neloc = oeloc;
2245                 nelen = (etype << 30) | oelen;
2246         }
2247         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2248         brelse(epos.bh);
2249
2250         return err;
2251 }
2252
2253 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2254 {
2255         struct extent_position oepos;
2256         int adsize;
2257         int8_t etype;
2258         struct allocExtDesc *aed;
2259         struct udf_inode_info *iinfo;
2260         struct kernel_lb_addr eloc;
2261         uint32_t elen;
2262
2263         if (epos.bh) {
2264                 get_bh(epos.bh);
2265                 get_bh(epos.bh);
2266         }
2267
2268         iinfo = UDF_I(inode);
2269         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2270                 adsize = sizeof(struct short_ad);
2271         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2272                 adsize = sizeof(struct long_ad);
2273         else
2274                 adsize = 0;
2275
2276         oepos = epos;
2277         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2278                 return -1;
2279
2280         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2281                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2282                 if (oepos.bh != epos.bh) {
2283                         oepos.block = epos.block;
2284                         brelse(oepos.bh);
2285                         get_bh(epos.bh);
2286                         oepos.bh = epos.bh;
2287                         oepos.offset = epos.offset - adsize;
2288                 }
2289         }
2290         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2291         elen = 0;
2292
2293         if (epos.bh != oepos.bh) {
2294                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2295                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2296                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2297                 if (!oepos.bh) {
2298                         iinfo->i_lenAlloc -= (adsize * 2);
2299                         mark_inode_dirty(inode);
2300                 } else {
2301                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2302                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2303                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2304                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2305                                 udf_update_tag(oepos.bh->b_data,
2306                                                 oepos.offset - (2 * adsize));
2307                         else
2308                                 udf_update_tag(oepos.bh->b_data,
2309                                                 sizeof(struct allocExtDesc));
2310                         mark_buffer_dirty_inode(oepos.bh, inode);
2311                 }
2312         } else {
2313                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2314                 if (!oepos.bh) {
2315                         iinfo->i_lenAlloc -= adsize;
2316                         mark_inode_dirty(inode);
2317                 } else {
2318                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2319                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2320                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2321                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2322                                 udf_update_tag(oepos.bh->b_data,
2323                                                 epos.offset - adsize);
2324                         else
2325                                 udf_update_tag(oepos.bh->b_data,
2326                                                 sizeof(struct allocExtDesc));
2327                         mark_buffer_dirty_inode(oepos.bh, inode);
2328                 }
2329         }
2330
2331         brelse(epos.bh);
2332         brelse(oepos.bh);
2333
2334         return (elen >> 30);
2335 }
2336
2337 int8_t inode_bmap(struct inode *inode, sector_t block,
2338                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2339                   uint32_t *elen, sector_t *offset)
2340 {
2341         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2342         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2343         int8_t etype;
2344         struct udf_inode_info *iinfo;
2345
2346         iinfo = UDF_I(inode);
2347         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2348                 pos->offset = 0;
2349                 pos->block = iinfo->i_location;
2350                 pos->bh = NULL;
2351         }
2352         *elen = 0;
2353         do {
2354                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2355                 if (etype == -1) {
2356                         *offset = (bcount - lbcount) >> blocksize_bits;
2357                         iinfo->i_lenExtents = lbcount;
2358                         return -1;
2359                 }
2360                 lbcount += *elen;
2361         } while (lbcount <= bcount);
2362         /* update extent cache */
2363         udf_update_extent_cache(inode, lbcount - *elen, pos);
2364         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2365
2366         return etype;
2367 }
2368
2369 udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
2370 {
2371         struct kernel_lb_addr eloc;
2372         uint32_t elen;
2373         sector_t offset;
2374         struct extent_position epos = {};
2375         udf_pblk_t ret;
2376
2377         down_read(&UDF_I(inode)->i_data_sem);
2378
2379         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2380                                                 (EXT_RECORDED_ALLOCATED >> 30))
2381                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2382         else
2383                 ret = 0;
2384
2385         up_read(&UDF_I(inode)->i_data_sem);
2386         brelse(epos.bh);
2387
2388         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2389                 return udf_fixed_to_variable(ret);
2390         else
2391                 return ret;
2392 }