fs/udf/inode.c

   1 /*
   2  * inode.c
   3  *
   4  * PURPOSE
   5  *  Inode handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *  This file is distributed under the terms of the GNU General Public
   9  *  License (GPL). Copies of the GPL can be obtained from:
  10  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *  Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998 Dave Boynton
  14  *  (C) 1998-2004 Ben Fennema
  15  *  (C) 1999-2000 Stelias Computing Inc
  16  *
  17  * HISTORY
  18  *
  19  *  10/04/98 dgb  Added rudimentary directory functions
  20  *  10/07/98      Fully working udf_block_map! It works!
  21  *  11/25/98      bmap altered to better support extents
  22  *  12/06/98 blf  partition support in udf_iget, udf_block_map
  23  *                and udf_read_inode
  24  *  12/12/98      rewrote udf_block_map to handle next extents and descs across
  25  *                block boundaries (which is not actually allowed)
  26  *  12/20/98      added support for strategy 4096
  27  *  03/07/99      rewrote udf_block_map (again)
  28  *                New funcs, inode_bmap, udf_next_aext
  29  *  04/19/99      Support for writing device EA's for major/minor #
  30  */
  31
  32 #include "udfdecl.h"
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/writeback.h>
  37 #include <linux/slab.h>
  38 #include <linux/crc-itu-t.h>
  39 #include <linux/mpage.h>
  40 #include <linux/uio.h>
  41 #include <linux/bio.h>
  42
  43 #include "udf_i.h"
  44 #include "udf_sb.h"
  45
  46 #define EXTENT_MERGE_SIZE 5
  47
  48 #define FE_MAPPED_PERMS (FE_PERM_U_READ | FE_PERM_U_WRITE | FE_PERM_U_EXEC | \
  49                          FE_PERM_G_READ | FE_PERM_G_WRITE | FE_PERM_G_EXEC | \
  50                          FE_PERM_O_READ | FE_PERM_O_WRITE | FE_PERM_O_EXEC)
  51
  52 #define FE_DELETE_PERMS (FE_PERM_U_DELETE | FE_PERM_G_DELETE | \
  53                          FE_PERM_O_DELETE)
  54
  55 static umode_t udf_convert_permissions(struct fileEntry *);
  56 static int udf_update_inode(struct inode *, int);
  57 static int udf_sync_inode(struct inode *inode);
  58 static int udf_alloc_i_data(struct inode *inode, size_t size);
  59 static sector_t inode_getblk(struct inode *, sector_t, int *, int *);
  60 static int udf_insert_aext(struct inode *, struct extent_position,
  61                            struct kernel_lb_addr, uint32_t);
  62 static void udf_split_extents(struct inode *, int *, int, udf_pblk_t,
  63                               struct kernel_long_ad *, int *);
  64 static void udf_prealloc_extents(struct inode *, int, int,
  65                                  struct kernel_long_ad *, int *);
  66 static void udf_merge_extents(struct inode *, struct kernel_long_ad *, int *);
  67 static int udf_update_extents(struct inode *, struct kernel_long_ad *, int,
  68                               int, struct extent_position *);
  69 static int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);
  70
  71 static void __udf_clear_extent_cache(struct inode *inode)
  72 {
  73         struct udf_inode_info *iinfo = UDF_I(inode);
  74
  75         if (iinfo->cached_extent.lstart != -1) {
  76                 brelse(iinfo->cached_extent.epos.bh);
  77                 iinfo->cached_extent.lstart = -1;
  78         }
  79 }
  80
  81 /* Invalidate extent cache */
  82 static void udf_clear_extent_cache(struct inode *inode)
  83 {
  84         struct udf_inode_info *iinfo = UDF_I(inode);
  85
  86         spin_lock(&iinfo->i_extent_cache_lock);
  87         __udf_clear_extent_cache(inode);
  88         spin_unlock(&iinfo->i_extent_cache_lock);
  89 }
  90
  91 /* Return contents of extent cache */
  92 static int udf_read_extent_cache(struct inode *inode, loff_t bcount,
  93                                  loff_t *lbcount, struct extent_position *pos)
  94 {
  95         struct udf_inode_info *iinfo = UDF_I(inode);
  96         int ret = 0;
  97
  98         spin_lock(&iinfo->i_extent_cache_lock);
  99         if ((iinfo->cached_extent.lstart <= bcount) &&
 100             (iinfo->cached_extent.lstart != -1)) {
 101                 /* Cache hit */
 102                 *lbcount = iinfo->cached_extent.lstart;
 103                 memcpy(pos, &iinfo->cached_extent.epos,
 104                        sizeof(struct extent_position));
 105                 if (pos->bh)
 106                         get_bh(pos->bh);
 107                 ret = 1;
 108         }
 109         spin_unlock(&iinfo->i_extent_cache_lock);
 110         return ret;
 111 }
 112
 113 /* Add extent to extent cache */
 114 static void udf_update_extent_cache(struct inode *inode, loff_t estart,
 115                                     struct extent_position *pos)
 116 {
 117         struct udf_inode_info *iinfo = UDF_I(inode);
 118
 119         spin_lock(&iinfo->i_extent_cache_lock);
 120         /* Invalidate previously cached extent */
 121         __udf_clear_extent_cache(inode);
 122         if (pos->bh)
 123                 get_bh(pos->bh);
 124         memcpy(&iinfo->cached_extent.epos, pos, sizeof(*pos));
 125         iinfo->cached_extent.lstart = estart;
 126         switch (iinfo->i_alloc_type) {
 127         case ICBTAG_FLAG_AD_SHORT:
 128                 iinfo->cached_extent.epos.offset -= sizeof(struct short_ad);
 129                 break;
 130         case ICBTAG_FLAG_AD_LONG:
 131                 iinfo->cached_extent.epos.offset -= sizeof(struct long_ad);
 132                 break;
 133         }
 134         spin_unlock(&iinfo->i_extent_cache_lock);
 135 }
 136
 137 void udf_evict_inode(struct inode *inode)
 138 {
 139         struct udf_inode_info *iinfo = UDF_I(inode);
 140         int want_delete = 0;
 141
 142         if (!is_bad_inode(inode)) {
 143                 if (!inode->i_nlink) {
 144                         want_delete = 1;
 145                         udf_setsize(inode, 0);
 146                         udf_update_inode(inode, IS_SYNC(inode));
 147                 }
 148                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 149                     inode->i_size != iinfo->i_lenExtents) {
 150                         udf_warn(inode->i_sb,
 151                                  "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 152                                  inode->i_ino, inode->i_mode,
 153                                  (unsigned long long)inode->i_size,
 154                                  (unsigned long long)iinfo->i_lenExtents);
 155                 }
 156         }
 157         truncate_inode_pages_final(&inode->i_data);
 158         invalidate_inode_buffers(inode);
 159         clear_inode(inode);
 160         kfree(iinfo->i_data);
 161         iinfo->i_data = NULL;
 162         udf_clear_extent_cache(inode);
 163         if (want_delete) {
 164                 udf_free_inode(inode);
 165         }
 166 }
 167
 168 static void udf_write_failed(struct address_space *mapping, loff_t to)
 169 {
 170         struct inode *inode = mapping->host;
 171         struct udf_inode_info *iinfo = UDF_I(inode);
 172         loff_t isize = inode->i_size;
 173
 174         if (to > isize) {
 175                 truncate_pagecache(inode, isize);
 176                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 177                         down_write(&iinfo->i_data_sem);
 178                         udf_clear_extent_cache(inode);
 179                         udf_truncate_extents(inode);
 180                         up_write(&iinfo->i_data_sem);
 181                 }
 182         }
 183 }
 184
 185 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 186 {
 187         return block_write_full_page(page, udf_get_block, wbc);
 188 }
 189
 190 static int udf_writepages(struct address_space *mapping,
 191                         struct writeback_control *wbc)
 192 {
 193         return mpage_writepages(mapping, wbc, udf_get_block);
 194 }
 195
 196 static int udf_read_folio(struct file *file, struct folio *folio)
 197 {
 198         return mpage_read_folio(folio, udf_get_block);
 199 }
 200
 201 static void udf_readahead(struct readahead_control *rac)
 202 {
 203         mpage_readahead(rac, udf_get_block);
 204 }
 205
 206 static int udf_write_begin(struct file *file, struct address_space *mapping,
 207                         loff_t pos, unsigned len,
 208                         struct page **pagep, void **fsdata)
 209 {
 210         int ret;
 211
 212         ret = block_write_begin(mapping, pos, len, pagep, udf_get_block);
 213         if (unlikely(ret))
 214                 udf_write_failed(mapping, pos + len);
 215         return ret;
 216 }
 217
 218 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 219 {
 220         struct file *file = iocb->ki_filp;
 221         struct address_space *mapping = file->f_mapping;
 222         struct inode *inode = mapping->host;
 223         size_t count = iov_iter_count(iter);
 224         ssize_t ret;
 225
 226         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 227         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 228                 udf_write_failed(mapping, iocb->ki_pos + count);
 229         return ret;
 230 }
 231
 232 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 233 {
 234         return generic_block_bmap(mapping, block, udf_get_block);
 235 }
 236
 237 const struct address_space_operations udf_aops = {
 238         .dirty_folio    = block_dirty_folio,
 239         .invalidate_folio = block_invalidate_folio,
 240         .read_folio     = udf_read_folio,
 241         .readahead      = udf_readahead,
 242         .writepage      = udf_writepage,
 243         .writepages     = udf_writepages,
 244         .write_begin    = udf_write_begin,
 245         .write_end      = generic_write_end,
 246         .direct_IO      = udf_direct_IO,
 247         .bmap           = udf_bmap,
 248 };
 249
 250 /*
 251  * Expand file stored in ICB to a normal one-block-file
 252  *
 253  * This function requires i_data_sem for writing and releases it.
 254  * This function requires i_mutex held
 255  */
 256 int udf_expand_file_adinicb(struct inode *inode)
 257 {
 258         struct page *page;
 259         char *kaddr;
 260         struct udf_inode_info *iinfo = UDF_I(inode);
 261         int err;
 262
 263         WARN_ON_ONCE(!inode_is_locked(inode));
 264         if (!iinfo->i_lenAlloc) {
 265                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 266                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 267                 else
 268                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 269                 /* from now on we have normal address_space methods */
 270                 inode->i_data.a_ops = &udf_aops;
 271                 up_write(&iinfo->i_data_sem);
 272                 mark_inode_dirty(inode);
 273                 return 0;
 274         }
 275         /*
 276          * Release i_data_sem so that we can lock a page - page lock ranks
 277          * above i_data_sem. i_mutex still protects us against file changes.
 278          */
 279         up_write(&iinfo->i_data_sem);
 280
 281         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 282         if (!page)
 283                 return -ENOMEM;
 284
 285         if (!PageUptodate(page)) {
 286                 kaddr = kmap_atomic(page);
 287                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 288                        PAGE_SIZE - iinfo->i_lenAlloc);
 289                 memcpy(kaddr, iinfo->i_data + iinfo->i_lenEAttr,
 290                         iinfo->i_lenAlloc);
 291                 flush_dcache_page(page);
 292                 SetPageUptodate(page);
 293                 kunmap_atomic(kaddr);
 294         }
 295         down_write(&iinfo->i_data_sem);
 296         memset(iinfo->i_data + iinfo->i_lenEAttr, 0x00,
 297                iinfo->i_lenAlloc);
 298         iinfo->i_lenAlloc = 0;
 299         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 300                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 301         else
 302                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 303         /* from now on we have normal address_space methods */
 304         inode->i_data.a_ops = &udf_aops;
 305         set_page_dirty(page);
 306         unlock_page(page);
 307         up_write(&iinfo->i_data_sem);
 308         err = filemap_fdatawrite(inode->i_mapping);
 309         if (err) {
 310                 /* Restore everything back so that we don't lose data... */
 311                 lock_page(page);
 312                 down_write(&iinfo->i_data_sem);
 313                 kaddr = kmap_atomic(page);
 314                 memcpy(iinfo->i_data + iinfo->i_lenEAttr, kaddr, 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                                  udf_get_fi_ident(sfi))) {
 394                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 395                         brelse(dbh);
 396                         return NULL;
 397                 }
 398         }
 399         mark_buffer_dirty_inode(dbh, inode);
 400
 401         memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
 402         iinfo->i_lenAlloc = 0;
 403         eloc.logicalBlockNum = *block;
 404         eloc.partitionReferenceNum =
 405                                 iinfo->i_location.partitionReferenceNum;
 406         iinfo->i_lenExtents = inode->i_size;
 407         epos.bh = NULL;
 408         epos.block = iinfo->i_location;
 409         epos.offset = udf_file_entry_alloc_offset(inode);
 410         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 411         /* UniqueID stuff */
 412
 413         brelse(epos.bh);
 414         mark_inode_dirty(inode);
 415         return dbh;
 416 }
 417
 418 static int udf_get_block(struct inode *inode, sector_t block,
 419                          struct buffer_head *bh_result, int create)
 420 {
 421         int err, new;
 422         sector_t phys = 0;
 423         struct udf_inode_info *iinfo;
 424
 425         if (!create) {
 426                 phys = udf_block_map(inode, block);
 427                 if (phys)
 428                         map_bh(bh_result, inode->i_sb, phys);
 429                 return 0;
 430         }
 431
 432         err = -EIO;
 433         new = 0;
 434         iinfo = UDF_I(inode);
 435
 436         down_write(&iinfo->i_data_sem);
 437         if (block == iinfo->i_next_alloc_block + 1) {
 438                 iinfo->i_next_alloc_block++;
 439                 iinfo->i_next_alloc_goal++;
 440         }
 441
 442         /*
 443          * Block beyond EOF and prealloc extents? Just discard preallocation
 444          * as it is not useful and complicates things.
 445          */
 446         if (((loff_t)block) << inode->i_blkbits >= iinfo->i_lenExtents)
 447                 udf_discard_prealloc(inode);
 448         udf_clear_extent_cache(inode);
 449         phys = inode_getblk(inode, block, &err, &new);
 450         if (!phys)
 451                 goto abort;
 452
 453         if (new)
 454                 set_buffer_new(bh_result);
 455         map_bh(bh_result, inode->i_sb, phys);
 456
 457 abort:
 458         up_write(&iinfo->i_data_sem);
 459         return err;
 460 }
 461
 462 static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
 463                                       int create, int *err)
 464 {
 465         struct buffer_head *bh;
 466         struct buffer_head dummy;
 467
 468         dummy.b_state = 0;
 469         dummy.b_blocknr = -1000;
 470         *err = udf_get_block(inode, block, &dummy, create);
 471         if (!*err && buffer_mapped(&dummy)) {
 472                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 473                 if (buffer_new(&dummy)) {
 474                         lock_buffer(bh);
 475                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 476                         set_buffer_uptodate(bh);
 477                         unlock_buffer(bh);
 478                         mark_buffer_dirty_inode(bh, inode);
 479                 }
 480                 return bh;
 481         }
 482
 483         return NULL;
 484 }
 485
 486 /* Extend the file with new blocks totaling 'new_block_bytes',
 487  * return the number of extents added
 488  */
 489 static int udf_do_extend_file(struct inode *inode,
 490                               struct extent_position *last_pos,
 491                               struct kernel_long_ad *last_ext,
 492                               loff_t new_block_bytes)
 493 {
 494         uint32_t add;
 495         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 496         struct super_block *sb = inode->i_sb;
 497         struct udf_inode_info *iinfo;
 498         int err;
 499
 500         /* The previous extent is fake and we should not extend by anything
 501          * - there's nothing to do... */
 502         if (!new_block_bytes && fake)
 503                 return 0;
 504
 505         iinfo = UDF_I(inode);
 506         /* Round the last extent up to a multiple of block size */
 507         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 508                 last_ext->extLength =
 509                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 510                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 511                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 512                 iinfo->i_lenExtents =
 513                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 514                         ~(sb->s_blocksize - 1);
 515         }
 516
 517         /* Can we merge with the previous extent? */
 518         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 519                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 520                 add = (1 << 30) - sb->s_blocksize -
 521                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 522                 if (add > new_block_bytes)
 523                         add = new_block_bytes;
 524                 new_block_bytes -= add;
 525                 last_ext->extLength += add;
 526         }
 527
 528         if (fake) {
 529                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 530                                    last_ext->extLength, 1);
 531                 if (err < 0)
 532                         goto out_err;
 533                 count++;
 534         } else {
 535                 struct kernel_lb_addr tmploc;
 536                 uint32_t tmplen;
 537
 538                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 539                                 last_ext->extLength, 1);
 540
 541                 /*
 542                  * We've rewritten the last extent. If we are going to add
 543                  * more extents, we may need to enter possible following
 544                  * empty indirect extent.
 545                  */
 546                 if (new_block_bytes)
 547                         udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 548         }
 549
 550         /* Managed to do everything necessary? */
 551         if (!new_block_bytes)
 552                 goto out;
 553
 554         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 555         last_ext->extLocation.logicalBlockNum = 0;
 556         last_ext->extLocation.partitionReferenceNum = 0;
 557         add = (1 << 30) - sb->s_blocksize;
 558         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 559
 560         /* Create enough extents to cover the whole hole */
 561         while (new_block_bytes > add) {
 562                 new_block_bytes -= add;
 563                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 564                                    last_ext->extLength, 1);
 565                 if (err)
 566                         goto out_err;
 567                 count++;
 568         }
 569         if (new_block_bytes) {
 570                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 571                         new_block_bytes;
 572                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 573                                    last_ext->extLength, 1);
 574                 if (err)
 575                         goto out_err;
 576                 count++;
 577         }
 578
 579 out:
 580         /* last_pos should point to the last written extent... */
 581         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 582                 last_pos->offset -= sizeof(struct short_ad);
 583         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 584                 last_pos->offset -= sizeof(struct long_ad);
 585         else
 586                 return -EIO;
 587
 588         return count;
 589 out_err:
 590         /* Remove extents we've created so far */
 591         udf_clear_extent_cache(inode);
 592         udf_truncate_extents(inode);
 593         return err;
 594 }
 595
 596 /* Extend the final block of the file to final_block_len bytes */
 597 static void udf_do_extend_final_block(struct inode *inode,
 598                                       struct extent_position *last_pos,
 599                                       struct kernel_long_ad *last_ext,
 600                                       uint32_t new_elen)
 601 {
 602         uint32_t added_bytes;
 603
 604         /*
 605          * Extent already large enough? It may be already rounded up to block
 606          * size...
 607          */
 608         if (new_elen <= (last_ext->extLength & UDF_EXTENT_LENGTH_MASK))
 609                 return;
 610         added_bytes = new_elen - (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 611         last_ext->extLength += added_bytes;
 612         UDF_I(inode)->i_lenExtents += added_bytes;
 613
 614         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 615                         last_ext->extLength, 1);
 616 }
 617
 618 static int udf_extend_file(struct inode *inode, loff_t newsize)
 619 {
 620
 621         struct extent_position epos;
 622         struct kernel_lb_addr eloc;
 623         uint32_t elen;
 624         int8_t etype;
 625         struct super_block *sb = inode->i_sb;
 626         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 627         loff_t new_elen;
 628         int adsize;
 629         struct udf_inode_info *iinfo = UDF_I(inode);
 630         struct kernel_long_ad extent;
 631         int err = 0;
 632         bool within_last_ext;
 633
 634         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 635                 adsize = sizeof(struct short_ad);
 636         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 637                 adsize = sizeof(struct long_ad);
 638         else
 639                 BUG();
 640
 641         /*
 642          * When creating hole in file, just don't bother with preserving
 643          * preallocation. It likely won't be very useful anyway.
 644          */
 645         udf_discard_prealloc(inode);
 646
 647         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 648         within_last_ext = (etype != -1);
 649         /* We don't expect extents past EOF... */
 650         WARN_ON_ONCE(within_last_ext &&
 651                      elen > ((loff_t)offset + 1) << inode->i_blkbits);
 652
 653         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 654             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 655                 /* File has no extents at all or has empty last
 656                  * indirect extent! Create a fake extent... */
 657                 extent.extLocation.logicalBlockNum = 0;
 658                 extent.extLocation.partitionReferenceNum = 0;
 659                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 660         } else {
 661                 epos.offset -= adsize;
 662                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 663                                       &extent.extLength, 0);
 664                 extent.extLength |= etype << 30;
 665         }
 666
 667         new_elen = ((loff_t)offset << inode->i_blkbits) |
 668                                         (newsize & (sb->s_blocksize - 1));
 669
 670         /* File has extent covering the new size (could happen when extending
 671          * inside a block)?
 672          */
 673         if (within_last_ext) {
 674                 /* Extending file within the last file block */
 675                 udf_do_extend_final_block(inode, &epos, &extent, new_elen);
 676         } else {
 677                 err = udf_do_extend_file(inode, &epos, &extent, new_elen);
 678         }
 679
 680         if (err < 0)
 681                 goto out;
 682         err = 0;
 683         iinfo->i_lenExtents = newsize;
 684 out:
 685         brelse(epos.bh);
 686         return err;
 687 }
 688
 689 static sector_t inode_getblk(struct inode *inode, sector_t block,
 690                              int *err, int *new)
 691 {
 692         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 693         struct extent_position prev_epos, cur_epos, next_epos;
 694         int count = 0, startnum = 0, endnum = 0;
 695         uint32_t elen = 0, tmpelen;
 696         struct kernel_lb_addr eloc, tmpeloc;
 697         int c = 1;
 698         loff_t lbcount = 0, b_off = 0;
 699         udf_pblk_t newblocknum, newblock = 0;
 700         sector_t offset = 0;
 701         int8_t etype;
 702         struct udf_inode_info *iinfo = UDF_I(inode);
 703         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 704         int lastblock = 0;
 705         bool isBeyondEOF;
 706
 707         *err = 0;
 708         *new = 0;
 709         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 710         prev_epos.block = iinfo->i_location;
 711         prev_epos.bh = NULL;
 712         cur_epos = next_epos = prev_epos;
 713         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 714
 715         /* find the extent which contains the block we are looking for.
 716            alternate between laarr[0] and laarr[1] for locations of the
 717            current extent, and the previous extent */
 718         do {
 719                 if (prev_epos.bh != cur_epos.bh) {
 720                         brelse(prev_epos.bh);
 721                         get_bh(cur_epos.bh);
 722                         prev_epos.bh = cur_epos.bh;
 723                 }
 724                 if (cur_epos.bh != next_epos.bh) {
 725                         brelse(cur_epos.bh);
 726                         get_bh(next_epos.bh);
 727                         cur_epos.bh = next_epos.bh;
 728                 }
 729
 730                 lbcount += elen;
 731
 732                 prev_epos.block = cur_epos.block;
 733                 cur_epos.block = next_epos.block;
 734
 735                 prev_epos.offset = cur_epos.offset;
 736                 cur_epos.offset = next_epos.offset;
 737
 738                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 739                 if (etype == -1)
 740                         break;
 741
 742                 c = !c;
 743
 744                 laarr[c].extLength = (etype << 30) | elen;
 745                 laarr[c].extLocation = eloc;
 746
 747                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 748                         pgoal = eloc.logicalBlockNum +
 749                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 750                                  inode->i_sb->s_blocksize_bits);
 751
 752                 count++;
 753         } while (lbcount + elen <= b_off);
 754
 755         b_off -= lbcount;
 756         offset = b_off >> inode->i_sb->s_blocksize_bits;
 757         /*
 758          * Move prev_epos and cur_epos into indirect extent if we are at
 759          * the pointer to it
 760          */
 761         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 762         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 763
 764         /* if the extent is allocated and recorded, return the block
 765            if the extent is not a multiple of the blocksize, round up */
 766
 767         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 768                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 769                         elen = EXT_RECORDED_ALLOCATED |
 770                                 ((elen + inode->i_sb->s_blocksize - 1) &
 771                                  ~(inode->i_sb->s_blocksize - 1));
 772                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 773                 }
 774                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 775                 goto out_free;
 776         }
 777
 778         /* Are we beyond EOF and preallocated extent? */
 779         if (etype == -1) {
 780                 int ret;
 781                 loff_t hole_len;
 782
 783                 isBeyondEOF = true;
 784                 if (count) {
 785                         if (c)
 786                                 laarr[0] = laarr[1];
 787                         startnum = 1;
 788                 } else {
 789                         /* Create a fake extent when there's not one */
 790                         memset(&laarr[0].extLocation, 0x00,
 791                                 sizeof(struct kernel_lb_addr));
 792                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 793                         /* Will udf_do_extend_file() create real extent from
 794                            a fake one? */
 795                         startnum = (offset > 0);
 796                 }
 797                 /* Create extents for the hole between EOF and offset */
 798                 hole_len = (loff_t)offset << inode->i_blkbits;
 799                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 800                 if (ret < 0) {
 801                         *err = ret;
 802                         goto out_free;
 803                 }
 804                 c = 0;
 805                 offset = 0;
 806                 count += ret;
 807                 /*
 808                  * Is there any real extent? - otherwise we overwrite the fake
 809                  * one...
 810                  */
 811                 if (count)
 812                         c = !c;
 813                 laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 814                         inode->i_sb->s_blocksize;
 815                 memset(&laarr[c].extLocation, 0x00,
 816                         sizeof(struct kernel_lb_addr));
 817                 count++;
 818                 endnum = c + 1;
 819                 lastblock = 1;
 820         } else {
 821                 isBeyondEOF = false;
 822                 endnum = startnum = ((count > 2) ? 2 : count);
 823
 824                 /* if the current extent is in position 0,
 825                    swap it with the previous */
 826                 if (!c && count != 1) {
 827                         laarr[2] = laarr[0];
 828                         laarr[0] = laarr[1];
 829                         laarr[1] = laarr[2];
 830                         c = 1;
 831                 }
 832
 833                 /* if the current block is located in an extent,
 834                    read the next extent */
 835                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
 836                 if (etype != -1) {
 837                         laarr[c + 1].extLength = (etype << 30) | elen;
 838                         laarr[c + 1].extLocation = eloc;
 839                         count++;
 840                         startnum++;
 841                         endnum++;
 842                 } else
 843                         lastblock = 1;
 844         }
 845
 846         /* if the current extent is not recorded but allocated, get the
 847          * block in the extent corresponding to the requested block */
 848         if ((laarr[c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 849                 newblocknum = laarr[c].extLocation.logicalBlockNum + offset;
 850         else { /* otherwise, allocate a new block */
 851                 if (iinfo->i_next_alloc_block == block)
 852                         goal = iinfo->i_next_alloc_goal;
 853
 854                 if (!goal) {
 855                         if (!(goal = pgoal)) /* XXX: what was intended here? */
 856                                 goal = iinfo->i_location.logicalBlockNum + 1;
 857                 }
 858
 859                 newblocknum = udf_new_block(inode->i_sb, inode,
 860                                 iinfo->i_location.partitionReferenceNum,
 861                                 goal, err);
 862                 if (!newblocknum) {
 863                         *err = -ENOSPC;
 864                         goto out_free;
 865                 }
 866                 if (isBeyondEOF)
 867                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 868         }
 869
 870         /* if the extent the requsted block is located in contains multiple
 871          * blocks, split the extent into at most three extents. blocks prior
 872          * to requested block, requested block, and blocks after requested
 873          * block */
 874         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 875
 876         /* We preallocate blocks only for regular files. It also makes sense
 877          * for directories but there's a problem when to drop the
 878          * preallocation. We might use some delayed work for that but I feel
 879          * it's overengineering for a filesystem like UDF. */
 880         if (S_ISREG(inode->i_mode))
 881                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 882
 883         /* merge any continuous blocks in laarr */
 884         udf_merge_extents(inode, laarr, &endnum);
 885
 886         /* write back the new extents, inserting new extents if the new number
 887          * of extents is greater than the old number, and deleting extents if
 888          * the new number of extents is less than the old number */
 889         *err = udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 890         if (*err < 0)
 891                 goto out_free;
 892
 893         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 894                                 iinfo->i_location.partitionReferenceNum, 0);
 895         if (!newblock) {
 896                 *err = -EIO;
 897                 goto out_free;
 898         }
 899         *new = 1;
 900         iinfo->i_next_alloc_block = block;
 901         iinfo->i_next_alloc_goal = newblocknum;
 902         inode->i_ctime = current_time(inode);
 903
 904         if (IS_SYNC(inode))
 905                 udf_sync_inode(inode);
 906         else
 907                 mark_inode_dirty(inode);
 908 out_free:
 909         brelse(prev_epos.bh);
 910         brelse(cur_epos.bh);
 911         brelse(next_epos.bh);
 912         return newblock;
 913 }
 914
 915 static void udf_split_extents(struct inode *inode, int *c, int offset,
 916                                udf_pblk_t newblocknum,
 917                                struct kernel_long_ad *laarr, int *endnum)
 918 {
 919         unsigned long blocksize = inode->i_sb->s_blocksize;
 920         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 921
 922         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 923             (laarr[*c].extLength >> 30) ==
 924                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 925                 int curr = *c;
 926                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 927                             blocksize - 1) >> blocksize_bits;
 928                 int8_t etype = (laarr[curr].extLength >> 30);
 929
 930                 if (blen == 1)
 931                         ;
 932                 else if (!offset || blen == offset + 1) {
 933                         laarr[curr + 2] = laarr[curr + 1];
 934                         laarr[curr + 1] = laarr[curr];
 935                 } else {
 936                         laarr[curr + 3] = laarr[curr + 1];
 937                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 938                 }
 939
 940                 if (offset) {
 941                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 942                                 udf_free_blocks(inode->i_sb, inode,
 943                                                 &laarr[curr].extLocation,
 944                                                 0, offset);
 945                                 laarr[curr].extLength =
 946                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 947                                         (offset << blocksize_bits);
 948                                 laarr[curr].extLocation.logicalBlockNum = 0;
 949                                 laarr[curr].extLocation.
 950                                                 partitionReferenceNum = 0;
 951                         } else
 952                                 laarr[curr].extLength = (etype << 30) |
 953                                         (offset << blocksize_bits);
 954                         curr++;
 955                         (*c)++;
 956                         (*endnum)++;
 957                 }
 958
 959                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 960                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 961                         laarr[curr].extLocation.partitionReferenceNum =
 962                                 UDF_I(inode)->i_location.partitionReferenceNum;
 963                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 964                         blocksize;
 965                 curr++;
 966
 967                 if (blen != offset + 1) {
 968                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 969                                 laarr[curr].extLocation.logicalBlockNum +=
 970                                                                 offset + 1;
 971                         laarr[curr].extLength = (etype << 30) |
 972                                 ((blen - (offset + 1)) << blocksize_bits);
 973                         curr++;
 974                         (*endnum)++;
 975                 }
 976         }
 977 }
 978
 979 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 980                                  struct kernel_long_ad *laarr,
 981                                  int *endnum)
 982 {
 983         int start, length = 0, currlength = 0, i;
 984
 985         if (*endnum >= (c + 1)) {
 986                 if (!lastblock)
 987                         return;
 988                 else
 989                         start = c;
 990         } else {
 991                 if ((laarr[c + 1].extLength >> 30) ==
 992                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 993                         start = c + 1;
 994                         length = currlength =
 995                                 (((laarr[c + 1].extLength &
 996                                         UDF_EXTENT_LENGTH_MASK) +
 997                                 inode->i_sb->s_blocksize - 1) >>
 998                                 inode->i_sb->s_blocksize_bits);
 999                 } else
1000                         start = c;
1001         }
1002
1003         for (i = start + 1; i <= *endnum; i++) {
1004                 if (i == *endnum) {
1005                         if (lastblock)
1006                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1007                 } else if ((laarr[i].extLength >> 30) ==
1008                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1009                         length += (((laarr[i].extLength &
1010                                                 UDF_EXTENT_LENGTH_MASK) +
1011                                     inode->i_sb->s_blocksize - 1) >>
1012                                     inode->i_sb->s_blocksize_bits);
1013                 } else
1014                         break;
1015         }
1016
1017         if (length) {
1018                 int next = laarr[start].extLocation.logicalBlockNum +
1019                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1020                           inode->i_sb->s_blocksize - 1) >>
1021                           inode->i_sb->s_blocksize_bits);
1022                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1023                                 laarr[start].extLocation.partitionReferenceNum,
1024                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1025                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1026                                 currlength);
1027                 if (numalloc)   {
1028                         if (start == (c + 1))
1029                                 laarr[start].extLength +=
1030                                         (numalloc <<
1031                                          inode->i_sb->s_blocksize_bits);
1032                         else {
1033                                 memmove(&laarr[c + 2], &laarr[c + 1],
1034                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1035                                 (*endnum)++;
1036                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1037                                 laarr[c + 1].extLocation.partitionReferenceNum =
1038                                         laarr[c].extLocation.
1039                                                         partitionReferenceNum;
1040                                 laarr[c + 1].extLength =
1041                                         EXT_NOT_RECORDED_ALLOCATED |
1042                                         (numalloc <<
1043                                          inode->i_sb->s_blocksize_bits);
1044                                 start = c + 1;
1045                         }
1046
1047                         for (i = start + 1; numalloc && i < *endnum; i++) {
1048                                 int elen = ((laarr[i].extLength &
1049                                                 UDF_EXTENT_LENGTH_MASK) +
1050                                             inode->i_sb->s_blocksize - 1) >>
1051                                             inode->i_sb->s_blocksize_bits;
1052
1053                                 if (elen > numalloc) {
1054                                         laarr[i].extLength -=
1055                                                 (numalloc <<
1056                                                  inode->i_sb->s_blocksize_bits);
1057                                         numalloc = 0;
1058                                 } else {
1059                                         numalloc -= elen;
1060                                         if (*endnum > (i + 1))
1061                                                 memmove(&laarr[i],
1062                                                         &laarr[i + 1],
1063                                                         sizeof(struct long_ad) *
1064                                                         (*endnum - (i + 1)));
1065                                         i--;
1066                                         (*endnum)--;
1067                                 }
1068                         }
1069                         UDF_I(inode)->i_lenExtents +=
1070                                 numalloc << inode->i_sb->s_blocksize_bits;
1071                 }
1072         }
1073 }
1074
1075 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1076                               int *endnum)
1077 {
1078         int i;
1079         unsigned long blocksize = inode->i_sb->s_blocksize;
1080         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1081
1082         for (i = 0; i < (*endnum - 1); i++) {
1083                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1084                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1085
1086                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1087                         (((li->extLength >> 30) ==
1088                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1089                         ((lip1->extLocation.logicalBlockNum -
1090                           li->extLocation.logicalBlockNum) ==
1091                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1092                         blocksize - 1) >> blocksize_bits)))) {
1093
1094                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1095                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1096                              blocksize - 1) <= UDF_EXTENT_LENGTH_MASK) {
1097                                 li->extLength = lip1->extLength +
1098                                         (((li->extLength &
1099                                                 UDF_EXTENT_LENGTH_MASK) +
1100                                          blocksize - 1) & ~(blocksize - 1));
1101                                 if (*endnum > (i + 2))
1102                                         memmove(&laarr[i + 1], &laarr[i + 2],
1103                                                 sizeof(struct long_ad) *
1104                                                 (*endnum - (i + 2)));
1105                                 i--;
1106                                 (*endnum)--;
1107                         }
1108                 } else if (((li->extLength >> 30) ==
1109                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1110                            ((lip1->extLength >> 30) ==
1111                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1112                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1113                                         ((li->extLength &
1114                                           UDF_EXTENT_LENGTH_MASK) +
1115                                          blocksize - 1) >> blocksize_bits);
1116                         li->extLocation.logicalBlockNum = 0;
1117                         li->extLocation.partitionReferenceNum = 0;
1118
1119                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1120                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1121                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1122                                 lip1->extLength = (lip1->extLength -
1123                                                    (li->extLength &
1124                                                    UDF_EXTENT_LENGTH_MASK) +
1125                                                    UDF_EXTENT_LENGTH_MASK) &
1126                                                    ~(blocksize - 1);
1127                                 li->extLength = (li->extLength &
1128                                                  UDF_EXTENT_FLAG_MASK) +
1129                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1130                                                 blocksize;
1131                         } else {
1132                                 li->extLength = lip1->extLength +
1133                                         (((li->extLength &
1134                                                 UDF_EXTENT_LENGTH_MASK) +
1135                                           blocksize - 1) & ~(blocksize - 1));
1136                                 if (*endnum > (i + 2))
1137                                         memmove(&laarr[i + 1], &laarr[i + 2],
1138                                                 sizeof(struct long_ad) *
1139                                                 (*endnum - (i + 2)));
1140                                 i--;
1141                                 (*endnum)--;
1142                         }
1143                 } else if ((li->extLength >> 30) ==
1144                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1145                         udf_free_blocks(inode->i_sb, inode,
1146                                         &li->extLocation, 0,
1147                                         ((li->extLength &
1148                                                 UDF_EXTENT_LENGTH_MASK) +
1149                                          blocksize - 1) >> blocksize_bits);
1150                         li->extLocation.logicalBlockNum = 0;
1151                         li->extLocation.partitionReferenceNum = 0;
1152                         li->extLength = (li->extLength &
1153                                                 UDF_EXTENT_LENGTH_MASK) |
1154                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1155                 }
1156         }
1157 }
1158
1159 static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1160                               int startnum, int endnum,
1161                               struct extent_position *epos)
1162 {
1163         int start = 0, i;
1164         struct kernel_lb_addr tmploc;
1165         uint32_t tmplen;
1166         int err;
1167
1168         if (startnum > endnum) {
1169                 for (i = 0; i < (startnum - endnum); i++)
1170                         udf_delete_aext(inode, *epos);
1171         } else if (startnum < endnum) {
1172                 for (i = 0; i < (endnum - startnum); i++) {
1173                         err = udf_insert_aext(inode, *epos,
1174                                               laarr[i].extLocation,
1175                                               laarr[i].extLength);
1176                         /*
1177                          * If we fail here, we are likely corrupting the extent
1178                          * list and leaking blocks. At least stop early to
1179                          * limit the damage.
1180                          */
1181                         if (err < 0)
1182                                 return err;
1183                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1184                                       &laarr[i].extLength, 1);
1185                         start++;
1186                 }
1187         }
1188
1189         for (i = start; i < endnum; i++) {
1190                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1191                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1192                                laarr[i].extLength, 1);
1193         }
1194         return 0;
1195 }
1196
1197 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1198                               int create, int *err)
1199 {
1200         struct buffer_head *bh = NULL;
1201
1202         bh = udf_getblk(inode, block, create, err);
1203         if (!bh)
1204                 return NULL;
1205
1206         if (bh_read(bh, 0) >= 0)
1207                 return bh;
1208
1209         brelse(bh);
1210         *err = -EIO;
1211         return NULL;
1212 }
1213
1214 int udf_setsize(struct inode *inode, loff_t newsize)
1215 {
1216         int err;
1217         struct udf_inode_info *iinfo;
1218         unsigned int bsize = i_blocksize(inode);
1219
1220         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1221               S_ISLNK(inode->i_mode)))
1222                 return -EINVAL;
1223         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1224                 return -EPERM;
1225
1226         iinfo = UDF_I(inode);
1227         if (newsize > inode->i_size) {
1228                 down_write(&iinfo->i_data_sem);
1229                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1230                         if (bsize <
1231                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1232                                 err = udf_expand_file_adinicb(inode);
1233                                 if (err)
1234                                         return err;
1235                                 down_write(&iinfo->i_data_sem);
1236                         } else {
1237                                 iinfo->i_lenAlloc = newsize;
1238                                 goto set_size;
1239                         }
1240                 }
1241                 err = udf_extend_file(inode, newsize);
1242                 if (err) {
1243                         up_write(&iinfo->i_data_sem);
1244                         return err;
1245                 }
1246 set_size:
1247                 up_write(&iinfo->i_data_sem);
1248                 truncate_setsize(inode, newsize);
1249         } else {
1250                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1251                         down_write(&iinfo->i_data_sem);
1252                         udf_clear_extent_cache(inode);
1253                         memset(iinfo->i_data + iinfo->i_lenEAttr + newsize,
1254                                0x00, bsize - newsize -
1255                                udf_file_entry_alloc_offset(inode));
1256                         iinfo->i_lenAlloc = newsize;
1257                         truncate_setsize(inode, newsize);
1258                         up_write(&iinfo->i_data_sem);
1259                         goto update_time;
1260                 }
1261                 err = block_truncate_page(inode->i_mapping, newsize,
1262                                           udf_get_block);
1263                 if (err)
1264                         return err;
1265                 truncate_setsize(inode, newsize);
1266                 down_write(&iinfo->i_data_sem);
1267                 udf_clear_extent_cache(inode);
1268                 err = udf_truncate_extents(inode);
1269                 up_write(&iinfo->i_data_sem);
1270                 if (err)
1271                         return err;
1272         }
1273 update_time:
1274         inode->i_mtime = inode->i_ctime = current_time(inode);
1275         if (IS_SYNC(inode))
1276                 udf_sync_inode(inode);
1277         else
1278                 mark_inode_dirty(inode);
1279         return 0;
1280 }
1281
1282 /*
1283  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1284  * arbitrary - just that we hopefully don't limit any real use of rewritten
1285  * inode on write-once media but avoid looping for too long on corrupted media.
1286  */
1287 #define UDF_MAX_ICB_NESTING 1024
1288
1289 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1290 {
1291         struct buffer_head *bh = NULL;
1292         struct fileEntry *fe;
1293         struct extendedFileEntry *efe;
1294         uint16_t ident;
1295         struct udf_inode_info *iinfo = UDF_I(inode);
1296         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1297         struct kernel_lb_addr *iloc = &iinfo->i_location;
1298         unsigned int link_count;
1299         unsigned int indirections = 0;
1300         int bs = inode->i_sb->s_blocksize;
1301         int ret = -EIO;
1302         uint32_t uid, gid;
1303
1304 reread:
1305         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1306                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1307                           iloc->partitionReferenceNum, sbi->s_partitions);
1308                 return -EIO;
1309         }
1310
1311         if (iloc->logicalBlockNum >=
1312             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1313                 udf_debug("block=%u, partition=%u out of range\n",
1314                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1315                 return -EIO;
1316         }
1317
1318         /*
1319          * Set defaults, but the inode is still incomplete!
1320          * Note: get_new_inode() sets the following on a new inode:
1321          *      i_sb = sb
1322          *      i_no = ino
1323          *      i_flags = sb->s_flags
1324          *      i_state = 0
1325          * clean_inode(): zero fills and sets
1326          *      i_count = 1
1327          *      i_nlink = 1
1328          *      i_op = NULL;
1329          */
1330         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1331         if (!bh) {
1332                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1333                 return -EIO;
1334         }
1335
1336         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1337             ident != TAG_IDENT_USE) {
1338                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1339                         inode->i_ino, ident);
1340                 goto out;
1341         }
1342
1343         fe = (struct fileEntry *)bh->b_data;
1344         efe = (struct extendedFileEntry *)bh->b_data;
1345
1346         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1347                 struct buffer_head *ibh;
1348
1349                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1350                 if (ident == TAG_IDENT_IE && ibh) {
1351                         struct kernel_lb_addr loc;
1352                         struct indirectEntry *ie;
1353
1354                         ie = (struct indirectEntry *)ibh->b_data;
1355                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1356
1357                         if (ie->indirectICB.extLength) {
1358                                 brelse(ibh);
1359                                 memcpy(&iinfo->i_location, &loc,
1360                                        sizeof(struct kernel_lb_addr));
1361                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1362                                         udf_err(inode->i_sb,
1363                                                 "too many ICBs in ICB hierarchy"
1364                                                 " (max %d supported)\n",
1365                                                 UDF_MAX_ICB_NESTING);
1366                                         goto out;
1367                                 }
1368                                 brelse(bh);
1369                                 goto reread;
1370                         }
1371                 }
1372                 brelse(ibh);
1373         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1374                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1375                         le16_to_cpu(fe->icbTag.strategyType));
1376                 goto out;
1377         }
1378         if (fe->icbTag.strategyType == cpu_to_le16(4))
1379                 iinfo->i_strat4096 = 0;
1380         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1381                 iinfo->i_strat4096 = 1;
1382
1383         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1384                                                         ICBTAG_FLAG_AD_MASK;
1385         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1386             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1387             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1388                 ret = -EIO;
1389                 goto out;
1390         }
1391         iinfo->i_hidden = hidden_inode;
1392         iinfo->i_unique = 0;
1393         iinfo->i_lenEAttr = 0;
1394         iinfo->i_lenExtents = 0;
1395         iinfo->i_lenAlloc = 0;
1396         iinfo->i_next_alloc_block = 0;
1397         iinfo->i_next_alloc_goal = 0;
1398         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1399                 iinfo->i_efe = 1;
1400                 iinfo->i_use = 0;
1401                 ret = udf_alloc_i_data(inode, bs -
1402                                         sizeof(struct extendedFileEntry));
1403                 if (ret)
1404                         goto out;
1405                 memcpy(iinfo->i_data,
1406                        bh->b_data + sizeof(struct extendedFileEntry),
1407                        bs - sizeof(struct extendedFileEntry));
1408         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1409                 iinfo->i_efe = 0;
1410                 iinfo->i_use = 0;
1411                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1412                 if (ret)
1413                         goto out;
1414                 memcpy(iinfo->i_data,
1415                        bh->b_data + sizeof(struct fileEntry),
1416                        bs - sizeof(struct fileEntry));
1417         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1418                 iinfo->i_efe = 0;
1419                 iinfo->i_use = 1;
1420                 iinfo->i_lenAlloc = le32_to_cpu(
1421                                 ((struct unallocSpaceEntry *)bh->b_data)->
1422                                  lengthAllocDescs);
1423                 ret = udf_alloc_i_data(inode, bs -
1424                                         sizeof(struct unallocSpaceEntry));
1425                 if (ret)
1426                         goto out;
1427                 memcpy(iinfo->i_data,
1428                        bh->b_data + sizeof(struct unallocSpaceEntry),
1429                        bs - sizeof(struct unallocSpaceEntry));
1430                 return 0;
1431         }
1432
1433         ret = -EIO;
1434         read_lock(&sbi->s_cred_lock);
1435         uid = le32_to_cpu(fe->uid);
1436         if (uid == UDF_INVALID_ID ||
1437             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1438                 inode->i_uid = sbi->s_uid;
1439         else
1440                 i_uid_write(inode, uid);
1441
1442         gid = le32_to_cpu(fe->gid);
1443         if (gid == UDF_INVALID_ID ||
1444             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1445                 inode->i_gid = sbi->s_gid;
1446         else
1447                 i_gid_write(inode, gid);
1448
1449         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1450                         sbi->s_fmode != UDF_INVALID_MODE)
1451                 inode->i_mode = sbi->s_fmode;
1452         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1453                         sbi->s_dmode != UDF_INVALID_MODE)
1454                 inode->i_mode = sbi->s_dmode;
1455         else
1456                 inode->i_mode = udf_convert_permissions(fe);
1457         inode->i_mode &= ~sbi->s_umask;
1458         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1459
1460         read_unlock(&sbi->s_cred_lock);
1461
1462         link_count = le16_to_cpu(fe->fileLinkCount);
1463         if (!link_count) {
1464                 if (!hidden_inode) {
1465                         ret = -ESTALE;
1466                         goto out;
1467                 }
1468                 link_count = 1;
1469         }
1470         set_nlink(inode, link_count);
1471
1472         inode->i_size = le64_to_cpu(fe->informationLength);
1473         iinfo->i_lenExtents = inode->i_size;
1474
1475         if (iinfo->i_efe == 0) {
1476                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1477                         (inode->i_sb->s_blocksize_bits - 9);
1478
1479                 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1480                 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1481                 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1482
1483                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1484                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1485                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1486                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1487                 iinfo->i_streamdir = 0;
1488                 iinfo->i_lenStreams = 0;
1489         } else {
1490                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1491                     (inode->i_sb->s_blocksize_bits - 9);
1492
1493                 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1494                 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1495                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1496                 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1497
1498                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1499                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1500                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1501                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1502
1503                 /* Named streams */
1504                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1505                 iinfo->i_locStreamdir =
1506                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1507                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1508                 if (iinfo->i_lenStreams >= inode->i_size)
1509                         iinfo->i_lenStreams -= inode->i_size;
1510                 else
1511                         iinfo->i_lenStreams = 0;
1512         }
1513         inode->i_generation = iinfo->i_unique;
1514
1515         /*
1516          * Sanity check length of allocation descriptors and extended attrs to
1517          * avoid integer overflows
1518          */
1519         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1520                 goto out;
1521         /* Now do exact checks */
1522         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1523                 goto out;
1524         /* Sanity checks for files in ICB so that we don't get confused later */
1525         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1526                 /*
1527                  * For file in ICB data is stored in allocation descriptor
1528                  * so sizes should match
1529                  */
1530                 if (iinfo->i_lenAlloc != inode->i_size)
1531                         goto out;
1532                 /* File in ICB has to fit in there... */
1533                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1534                         goto out;
1535         }
1536
1537         switch (fe->icbTag.fileType) {
1538         case ICBTAG_FILE_TYPE_DIRECTORY:
1539                 inode->i_op = &udf_dir_inode_operations;
1540                 inode->i_fop = &udf_dir_operations;
1541                 inode->i_mode |= S_IFDIR;
1542                 inc_nlink(inode);
1543                 break;
1544         case ICBTAG_FILE_TYPE_REALTIME:
1545         case ICBTAG_FILE_TYPE_REGULAR:
1546         case ICBTAG_FILE_TYPE_UNDEF:
1547         case ICBTAG_FILE_TYPE_VAT20:
1548                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1549                         inode->i_data.a_ops = &udf_adinicb_aops;
1550                 else
1551                         inode->i_data.a_ops = &udf_aops;
1552                 inode->i_op = &udf_file_inode_operations;
1553                 inode->i_fop = &udf_file_operations;
1554                 inode->i_mode |= S_IFREG;
1555                 break;
1556         case ICBTAG_FILE_TYPE_BLOCK:
1557                 inode->i_mode |= S_IFBLK;
1558                 break;
1559         case ICBTAG_FILE_TYPE_CHAR:
1560                 inode->i_mode |= S_IFCHR;
1561                 break;
1562         case ICBTAG_FILE_TYPE_FIFO:
1563                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1564                 break;
1565         case ICBTAG_FILE_TYPE_SOCKET:
1566                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1567                 break;
1568         case ICBTAG_FILE_TYPE_SYMLINK:
1569                 inode->i_data.a_ops = &udf_symlink_aops;
1570                 inode->i_op = &udf_symlink_inode_operations;
1571                 inode_nohighmem(inode);
1572                 inode->i_mode = S_IFLNK | 0777;
1573                 break;
1574         case ICBTAG_FILE_TYPE_MAIN:
1575                 udf_debug("METADATA FILE-----\n");
1576                 break;
1577         case ICBTAG_FILE_TYPE_MIRROR:
1578                 udf_debug("METADATA MIRROR FILE-----\n");
1579                 break;
1580         case ICBTAG_FILE_TYPE_BITMAP:
1581                 udf_debug("METADATA BITMAP FILE-----\n");
1582                 break;
1583         default:
1584                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1585                         inode->i_ino, fe->icbTag.fileType);
1586                 goto out;
1587         }
1588         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1589                 struct deviceSpec *dsea =
1590                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1591                 if (dsea) {
1592                         init_special_inode(inode, inode->i_mode,
1593                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1594                                       le32_to_cpu(dsea->minorDeviceIdent)));
1595                         /* Developer ID ??? */
1596                 } else
1597                         goto out;
1598         }
1599         ret = 0;
1600 out:
1601         brelse(bh);
1602         return ret;
1603 }
1604
1605 static int udf_alloc_i_data(struct inode *inode, size_t size)
1606 {
1607         struct udf_inode_info *iinfo = UDF_I(inode);
1608         iinfo->i_data = kmalloc(size, GFP_KERNEL);
1609         if (!iinfo->i_data)
1610                 return -ENOMEM;
1611         return 0;
1612 }
1613
1614 static umode_t udf_convert_permissions(struct fileEntry *fe)
1615 {
1616         umode_t mode;
1617         uint32_t permissions;
1618         uint32_t flags;
1619
1620         permissions = le32_to_cpu(fe->permissions);
1621         flags = le16_to_cpu(fe->icbTag.flags);
1622
1623         mode =  ((permissions) & 0007) |
1624                 ((permissions >> 2) & 0070) |
1625                 ((permissions >> 4) & 0700) |
1626                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1627                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1628                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1629
1630         return mode;
1631 }
1632
1633 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1634 {
1635         struct udf_inode_info *iinfo = UDF_I(inode);
1636
1637         /*
1638          * UDF 2.01 sec. 3.3.3.3 Note 2:
1639          * In Unix, delete permission tracks write
1640          */
1641         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1642         if (mode & 0200)
1643                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1644         if (mode & 0020)
1645                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1646         if (mode & 0002)
1647                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1648 }
1649
1650 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1651 {
1652         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1653 }
1654
1655 static int udf_sync_inode(struct inode *inode)
1656 {
1657         return udf_update_inode(inode, 1);
1658 }
1659
1660 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1661 {
1662         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1663             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1664              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1665                 iinfo->i_crtime = time;
1666 }
1667
1668 static int udf_update_inode(struct inode *inode, int do_sync)
1669 {
1670         struct buffer_head *bh = NULL;
1671         struct fileEntry *fe;
1672         struct extendedFileEntry *efe;
1673         uint64_t lb_recorded;
1674         uint32_t udfperms;
1675         uint16_t icbflags;
1676         uint16_t crclen;
1677         int err = 0;
1678         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1679         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1680         struct udf_inode_info *iinfo = UDF_I(inode);
1681
1682         bh = udf_tgetblk(inode->i_sb,
1683                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1684         if (!bh) {
1685                 udf_debug("getblk failure\n");
1686                 return -EIO;
1687         }
1688
1689         lock_buffer(bh);
1690         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1691         fe = (struct fileEntry *)bh->b_data;
1692         efe = (struct extendedFileEntry *)bh->b_data;
1693
1694         if (iinfo->i_use) {
1695                 struct unallocSpaceEntry *use =
1696                         (struct unallocSpaceEntry *)bh->b_data;
1697
1698                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1699                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1700                        iinfo->i_data, inode->i_sb->s_blocksize -
1701                                         sizeof(struct unallocSpaceEntry));
1702                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1703                 crclen = sizeof(struct unallocSpaceEntry);
1704
1705                 goto finish;
1706         }
1707
1708         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1709                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1710         else
1711                 fe->uid = cpu_to_le32(i_uid_read(inode));
1712
1713         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1714                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1715         else
1716                 fe->gid = cpu_to_le32(i_gid_read(inode));
1717
1718         udfperms = ((inode->i_mode & 0007)) |
1719                    ((inode->i_mode & 0070) << 2) |
1720                    ((inode->i_mode & 0700) << 4);
1721
1722         udfperms |= iinfo->i_extraPerms;
1723         fe->permissions = cpu_to_le32(udfperms);
1724
1725         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1726                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1727         else {
1728                 if (iinfo->i_hidden)
1729                         fe->fileLinkCount = cpu_to_le16(0);
1730                 else
1731                         fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1732         }
1733
1734         fe->informationLength = cpu_to_le64(inode->i_size);
1735
1736         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1737                 struct regid *eid;
1738                 struct deviceSpec *dsea =
1739                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1740                 if (!dsea) {
1741                         dsea = (struct deviceSpec *)
1742                                 udf_add_extendedattr(inode,
1743                                                      sizeof(struct deviceSpec) +
1744                                                      sizeof(struct regid), 12, 0x3);
1745                         dsea->attrType = cpu_to_le32(12);
1746                         dsea->attrSubtype = 1;
1747                         dsea->attrLength = cpu_to_le32(
1748                                                 sizeof(struct deviceSpec) +
1749                                                 sizeof(struct regid));
1750                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1751                 }
1752                 eid = (struct regid *)dsea->impUse;
1753                 memset(eid, 0, sizeof(*eid));
1754                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1755                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1756                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1757                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1758                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1759         }
1760
1761         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1762                 lb_recorded = 0; /* No extents => no blocks! */
1763         else
1764                 lb_recorded =
1765                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1766                         (blocksize_bits - 9);
1767
1768         if (iinfo->i_efe == 0) {
1769                 memcpy(bh->b_data + sizeof(struct fileEntry),
1770                        iinfo->i_data,
1771                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1772                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1773
1774                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1775                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1776                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1777                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1778                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1779                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1780                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1781                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1782                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1783                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1784                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1785                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1786                 crclen = sizeof(struct fileEntry);
1787         } else {
1788                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1789                        iinfo->i_data,
1790                        inode->i_sb->s_blocksize -
1791                                         sizeof(struct extendedFileEntry));
1792                 efe->objectSize =
1793                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1794                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1795
1796                 if (iinfo->i_streamdir) {
1797                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1798
1799                         icb_lad->extLocation =
1800                                 cpu_to_lelb(iinfo->i_locStreamdir);
1801                         icb_lad->extLength =
1802                                 cpu_to_le32(inode->i_sb->s_blocksize);
1803                 }
1804
1805                 udf_adjust_time(iinfo, inode->i_atime);
1806                 udf_adjust_time(iinfo, inode->i_mtime);
1807                 udf_adjust_time(iinfo, inode->i_ctime);
1808
1809                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1810                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1811                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1812                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1813
1814                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1815                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1816                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1817                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1818                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1819                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1820                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1821                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1822                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1823                 crclen = sizeof(struct extendedFileEntry);
1824         }
1825
1826 finish:
1827         if (iinfo->i_strat4096) {
1828                 fe->icbTag.strategyType = cpu_to_le16(4096);
1829                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1830                 fe->icbTag.numEntries = cpu_to_le16(2);
1831         } else {
1832                 fe->icbTag.strategyType = cpu_to_le16(4);
1833                 fe->icbTag.numEntries = cpu_to_le16(1);
1834         }
1835
1836         if (iinfo->i_use)
1837                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1838         else if (S_ISDIR(inode->i_mode))
1839                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1840         else if (S_ISREG(inode->i_mode))
1841                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1842         else if (S_ISLNK(inode->i_mode))
1843                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1844         else if (S_ISBLK(inode->i_mode))
1845                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1846         else if (S_ISCHR(inode->i_mode))
1847                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1848         else if (S_ISFIFO(inode->i_mode))
1849                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1850         else if (S_ISSOCK(inode->i_mode))
1851                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1852
1853         icbflags =      iinfo->i_alloc_type |
1854                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1855                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1856                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1857                         (le16_to_cpu(fe->icbTag.flags) &
1858                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1859                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1860
1861         fe->icbTag.flags = cpu_to_le16(icbflags);
1862         if (sbi->s_udfrev >= 0x0200)
1863                 fe->descTag.descVersion = cpu_to_le16(3);
1864         else
1865                 fe->descTag.descVersion = cpu_to_le16(2);
1866         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1867         fe->descTag.tagLocation = cpu_to_le32(
1868                                         iinfo->i_location.logicalBlockNum);
1869         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1870         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1871         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1872                                                   crclen));
1873         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1874
1875         set_buffer_uptodate(bh);
1876         unlock_buffer(bh);
1877
1878         /* write the data blocks */
1879         mark_buffer_dirty(bh);
1880         if (do_sync) {
1881                 sync_dirty_buffer(bh);
1882                 if (buffer_write_io_error(bh)) {
1883                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1884                                  inode->i_ino);
1885                         err = -EIO;
1886                 }
1887         }
1888         brelse(bh);
1889
1890         return err;
1891 }
1892
1893 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1894                          bool hidden_inode)
1895 {
1896         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1897         struct inode *inode = iget_locked(sb, block);
1898         int err;
1899
1900         if (!inode)
1901                 return ERR_PTR(-ENOMEM);
1902
1903         if (!(inode->i_state & I_NEW)) {
1904                 if (UDF_I(inode)->i_hidden != hidden_inode) {
1905                         iput(inode);
1906                         return ERR_PTR(-EFSCORRUPTED);
1907                 }
1908                 return inode;
1909         }
1910
1911         memcpy(&UDF_I(inode)->i_location, ino, sizeof(struct kernel_lb_addr));
1912         err = udf_read_inode(inode, hidden_inode);
1913         if (err < 0) {
1914                 iget_failed(inode);
1915                 return ERR_PTR(err);
1916         }
1917         unlock_new_inode(inode);
1918
1919         return inode;
1920 }
1921
1922 int udf_setup_indirect_aext(struct inode *inode, udf_pblk_t block,
1923                             struct extent_position *epos)
1924 {
1925         struct super_block *sb = inode->i_sb;
1926         struct buffer_head *bh;
1927         struct allocExtDesc *aed;
1928         struct extent_position nepos;
1929         struct kernel_lb_addr neloc;
1930         int ver, adsize;
1931
1932         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
1933                 adsize = sizeof(struct short_ad);
1934         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
1935                 adsize = sizeof(struct long_ad);
1936         else
1937                 return -EIO;
1938
1939         neloc.logicalBlockNum = block;
1940         neloc.partitionReferenceNum = epos->block.partitionReferenceNum;
1941
1942         bh = udf_tgetblk(sb, udf_get_lb_pblock(sb, &neloc, 0));
1943         if (!bh)
1944                 return -EIO;
1945         lock_buffer(bh);
1946         memset(bh->b_data, 0x00, sb->s_blocksize);
1947         set_buffer_uptodate(bh);
1948         unlock_buffer(bh);
1949         mark_buffer_dirty_inode(bh, inode);
1950
1951         aed = (struct allocExtDesc *)(bh->b_data);
1952         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) {
1953                 aed->previousAllocExtLocation =
1954                                 cpu_to_le32(epos->block.logicalBlockNum);
1955         }
1956         aed->lengthAllocDescs = cpu_to_le32(0);
1957         if (UDF_SB(sb)->s_udfrev >= 0x0200)
1958                 ver = 3;
1959         else
1960                 ver = 2;
1961         udf_new_tag(bh->b_data, TAG_IDENT_AED, ver, 1, block,
1962                     sizeof(struct tag));
1963
1964         nepos.block = neloc;
1965         nepos.offset = sizeof(struct allocExtDesc);
1966         nepos.bh = bh;
1967
1968         /*
1969          * Do we have to copy current last extent to make space for indirect
1970          * one?
1971          */
1972         if (epos->offset + adsize > sb->s_blocksize) {
1973                 struct kernel_lb_addr cp_loc;
1974                 uint32_t cp_len;
1975                 int cp_type;
1976
1977                 epos->offset -= adsize;
1978                 cp_type = udf_current_aext(inode, epos, &cp_loc, &cp_len, 0);
1979                 cp_len |= ((uint32_t)cp_type) << 30;
1980
1981                 __udf_add_aext(inode, &nepos, &cp_loc, cp_len, 1);
1982                 udf_write_aext(inode, epos, &nepos.block,
1983                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
1984         } else {
1985                 __udf_add_aext(inode, epos, &nepos.block,
1986                                sb->s_blocksize | EXT_NEXT_EXTENT_ALLOCDESCS, 0);
1987         }
1988
1989         brelse(epos->bh);
1990         *epos = nepos;
1991
1992         return 0;
1993 }
1994
1995 /*
1996  * Append extent at the given position - should be the first free one in inode
1997  * / indirect extent. This function assumes there is enough space in the inode
1998  * or indirect extent. Use udf_add_aext() if you didn't check for this before.
1999  */
2000 int __udf_add_aext(struct inode *inode, struct extent_position *epos,
2001                    struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2002 {
2003         struct udf_inode_info *iinfo = UDF_I(inode);
2004         struct allocExtDesc *aed;
2005         int adsize;
2006
2007         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2008                 adsize = sizeof(struct short_ad);
2009         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2010                 adsize = sizeof(struct long_ad);
2011         else
2012                 return -EIO;
2013
2014         if (!epos->bh) {
2015                 WARN_ON(iinfo->i_lenAlloc !=
2016                         epos->offset - udf_file_entry_alloc_offset(inode));
2017         } else {
2018                 aed = (struct allocExtDesc *)epos->bh->b_data;
2019                 WARN_ON(le32_to_cpu(aed->lengthAllocDescs) !=
2020                         epos->offset - sizeof(struct allocExtDesc));
2021                 WARN_ON(epos->offset + adsize > inode->i_sb->s_blocksize);
2022         }
2023
2024         udf_write_aext(inode, epos, eloc, elen, inc);
2025
2026         if (!epos->bh) {
2027                 iinfo->i_lenAlloc += adsize;
2028                 mark_inode_dirty(inode);
2029         } else {
2030                 aed = (struct allocExtDesc *)epos->bh->b_data;
2031                 le32_add_cpu(&aed->lengthAllocDescs, adsize);
2032                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2033                                 UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2034                         udf_update_tag(epos->bh->b_data,
2035                                         epos->offset + (inc ? 0 : adsize));
2036                 else
2037                         udf_update_tag(epos->bh->b_data,
2038                                         sizeof(struct allocExtDesc));
2039                 mark_buffer_dirty_inode(epos->bh, inode);
2040         }
2041
2042         return 0;
2043 }
2044
2045 /*
2046  * Append extent at given position - should be the first free one in inode
2047  * / indirect extent. Takes care of allocating and linking indirect blocks.
2048  */
2049 int udf_add_aext(struct inode *inode, struct extent_position *epos,
2050                  struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2051 {
2052         int adsize;
2053         struct super_block *sb = inode->i_sb;
2054
2055         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2056                 adsize = sizeof(struct short_ad);
2057         else if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2058                 adsize = sizeof(struct long_ad);
2059         else
2060                 return -EIO;
2061
2062         if (epos->offset + (2 * adsize) > sb->s_blocksize) {
2063                 int err;
2064                 udf_pblk_t new_block;
2065
2066                 new_block = udf_new_block(sb, NULL,
2067                                           epos->block.partitionReferenceNum,
2068                                           epos->block.logicalBlockNum, &err);
2069                 if (!new_block)
2070                         return -ENOSPC;
2071
2072                 err = udf_setup_indirect_aext(inode, new_block, epos);
2073                 if (err)
2074                         return err;
2075         }
2076
2077         return __udf_add_aext(inode, epos, eloc, elen, inc);
2078 }
2079
2080 void udf_write_aext(struct inode *inode, struct extent_position *epos,
2081                     struct kernel_lb_addr *eloc, uint32_t elen, int inc)
2082 {
2083         int adsize;
2084         uint8_t *ptr;
2085         struct short_ad *sad;
2086         struct long_ad *lad;
2087         struct udf_inode_info *iinfo = UDF_I(inode);
2088
2089         if (!epos->bh)
2090                 ptr = iinfo->i_data + epos->offset -
2091                         udf_file_entry_alloc_offset(inode) +
2092                         iinfo->i_lenEAttr;
2093         else
2094                 ptr = epos->bh->b_data + epos->offset;
2095
2096         switch (iinfo->i_alloc_type) {
2097         case ICBTAG_FLAG_AD_SHORT:
2098                 sad = (struct short_ad *)ptr;
2099                 sad->extLength = cpu_to_le32(elen);
2100                 sad->extPosition = cpu_to_le32(eloc->logicalBlockNum);
2101                 adsize = sizeof(struct short_ad);
2102                 break;
2103         case ICBTAG_FLAG_AD_LONG:
2104                 lad = (struct long_ad *)ptr;
2105                 lad->extLength = cpu_to_le32(elen);
2106                 lad->extLocation = cpu_to_lelb(*eloc);
2107                 memset(lad->impUse, 0x00, sizeof(lad->impUse));
2108                 adsize = sizeof(struct long_ad);
2109                 break;
2110         default:
2111                 return;
2112         }
2113
2114         if (epos->bh) {
2115                 if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2116                     UDF_SB(inode->i_sb)->s_udfrev >= 0x0201) {
2117                         struct allocExtDesc *aed =
2118                                 (struct allocExtDesc *)epos->bh->b_data;
2119                         udf_update_tag(epos->bh->b_data,
2120                                        le32_to_cpu(aed->lengthAllocDescs) +
2121                                        sizeof(struct allocExtDesc));
2122                 }
2123                 mark_buffer_dirty_inode(epos->bh, inode);
2124         } else {
2125                 mark_inode_dirty(inode);
2126         }
2127
2128         if (inc)
2129                 epos->offset += adsize;
2130 }
2131
2132 /*
2133  * Only 1 indirect extent in a row really makes sense but allow upto 16 in case
2134  * someone does some weird stuff.
2135  */
2136 #define UDF_MAX_INDIR_EXTS 16
2137
2138 int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
2139                      struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2140 {
2141         int8_t etype;
2142         unsigned int indirections = 0;
2143
2144         while ((etype = udf_current_aext(inode, epos, eloc, elen, inc)) ==
2145                (EXT_NEXT_EXTENT_ALLOCDESCS >> 30)) {
2146                 udf_pblk_t block;
2147
2148                 if (++indirections > UDF_MAX_INDIR_EXTS) {
2149                         udf_err(inode->i_sb,
2150                                 "too many indirect extents in inode %lu\n",
2151                                 inode->i_ino);
2152                         return -1;
2153                 }
2154
2155                 epos->block = *eloc;
2156                 epos->offset = sizeof(struct allocExtDesc);
2157                 brelse(epos->bh);
2158                 block = udf_get_lb_pblock(inode->i_sb, &epos->block, 0);
2159                 epos->bh = udf_tread(inode->i_sb, block);
2160                 if (!epos->bh) {
2161                         udf_debug("reading block %u failed!\n", block);
2162                         return -1;
2163                 }
2164         }
2165
2166         return etype;
2167 }
2168
2169 int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
2170                         struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
2171 {
2172         int alen;
2173         int8_t etype;
2174         uint8_t *ptr;
2175         struct short_ad *sad;
2176         struct long_ad *lad;
2177         struct udf_inode_info *iinfo = UDF_I(inode);
2178
2179         if (!epos->bh) {
2180                 if (!epos->offset)
2181                         epos->offset = udf_file_entry_alloc_offset(inode);
2182                 ptr = iinfo->i_data + epos->offset -
2183                         udf_file_entry_alloc_offset(inode) +
2184                         iinfo->i_lenEAttr;
2185                 alen = udf_file_entry_alloc_offset(inode) +
2186                                                         iinfo->i_lenAlloc;
2187         } else {
2188                 if (!epos->offset)
2189                         epos->offset = sizeof(struct allocExtDesc);
2190                 ptr = epos->bh->b_data + epos->offset;
2191                 alen = sizeof(struct allocExtDesc) +
2192                         le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
2193                                                         lengthAllocDescs);
2194         }
2195
2196         switch (iinfo->i_alloc_type) {
2197         case ICBTAG_FLAG_AD_SHORT:
2198                 sad = udf_get_fileshortad(ptr, alen, &epos->offset, inc);
2199                 if (!sad)
2200                         return -1;
2201                 etype = le32_to_cpu(sad->extLength) >> 30;
2202                 eloc->logicalBlockNum = le32_to_cpu(sad->extPosition);
2203                 eloc->partitionReferenceNum =
2204                                 iinfo->i_location.partitionReferenceNum;
2205                 *elen = le32_to_cpu(sad->extLength) & UDF_EXTENT_LENGTH_MASK;
2206                 break;
2207         case ICBTAG_FLAG_AD_LONG:
2208                 lad = udf_get_filelongad(ptr, alen, &epos->offset, inc);
2209                 if (!lad)
2210                         return -1;
2211                 etype = le32_to_cpu(lad->extLength) >> 30;
2212                 *eloc = lelb_to_cpu(lad->extLocation);
2213                 *elen = le32_to_cpu(lad->extLength) & UDF_EXTENT_LENGTH_MASK;
2214                 break;
2215         default:
2216                 udf_debug("alloc_type = %u unsupported\n", iinfo->i_alloc_type);
2217                 return -1;
2218         }
2219
2220         return etype;
2221 }
2222
2223 static int udf_insert_aext(struct inode *inode, struct extent_position epos,
2224                            struct kernel_lb_addr neloc, uint32_t nelen)
2225 {
2226         struct kernel_lb_addr oeloc;
2227         uint32_t oelen;
2228         int8_t etype;
2229         int err;
2230
2231         if (epos.bh)
2232                 get_bh(epos.bh);
2233
2234         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2235                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2236                 neloc = oeloc;
2237                 nelen = (etype << 30) | oelen;
2238         }
2239         err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
2240         brelse(epos.bh);
2241
2242         return err;
2243 }
2244
2245 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2246 {
2247         struct extent_position oepos;
2248         int adsize;
2249         int8_t etype;
2250         struct allocExtDesc *aed;
2251         struct udf_inode_info *iinfo;
2252         struct kernel_lb_addr eloc;
2253         uint32_t elen;
2254
2255         if (epos.bh) {
2256                 get_bh(epos.bh);
2257                 get_bh(epos.bh);
2258         }
2259
2260         iinfo = UDF_I(inode);
2261         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2262                 adsize = sizeof(struct short_ad);
2263         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2264                 adsize = sizeof(struct long_ad);
2265         else
2266                 adsize = 0;
2267
2268         oepos = epos;
2269         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2270                 return -1;
2271
2272         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2273                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2274                 if (oepos.bh != epos.bh) {
2275                         oepos.block = epos.block;
2276                         brelse(oepos.bh);
2277                         get_bh(epos.bh);
2278                         oepos.bh = epos.bh;
2279                         oepos.offset = epos.offset - adsize;
2280                 }
2281         }
2282         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2283         elen = 0;
2284
2285         if (epos.bh != oepos.bh) {
2286                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2287                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2288                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2289                 if (!oepos.bh) {
2290                         iinfo->i_lenAlloc -= (adsize * 2);
2291                         mark_inode_dirty(inode);
2292                 } else {
2293                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2294                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2295                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2296                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2297                                 udf_update_tag(oepos.bh->b_data,
2298                                                 oepos.offset - (2 * adsize));
2299                         else
2300                                 udf_update_tag(oepos.bh->b_data,
2301                                                 sizeof(struct allocExtDesc));
2302                         mark_buffer_dirty_inode(oepos.bh, inode);
2303                 }
2304         } else {
2305                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2306                 if (!oepos.bh) {
2307                         iinfo->i_lenAlloc -= adsize;
2308                         mark_inode_dirty(inode);
2309                 } else {
2310                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2311                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2312                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2313                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2314                                 udf_update_tag(oepos.bh->b_data,
2315                                                 epos.offset - adsize);
2316                         else
2317                                 udf_update_tag(oepos.bh->b_data,
2318                                                 sizeof(struct allocExtDesc));
2319                         mark_buffer_dirty_inode(oepos.bh, inode);
2320                 }
2321         }
2322
2323         brelse(epos.bh);
2324         brelse(oepos.bh);
2325
2326         return (elen >> 30);
2327 }
2328
2329 int8_t inode_bmap(struct inode *inode, sector_t block,
2330                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2331                   uint32_t *elen, sector_t *offset)
2332 {
2333         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2334         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2335         int8_t etype;
2336         struct udf_inode_info *iinfo;
2337
2338         iinfo = UDF_I(inode);
2339         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2340                 pos->offset = 0;
2341                 pos->block = iinfo->i_location;
2342                 pos->bh = NULL;
2343         }
2344         *elen = 0;
2345         do {
2346                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2347                 if (etype == -1) {
2348                         *offset = (bcount - lbcount) >> blocksize_bits;
2349                         iinfo->i_lenExtents = lbcount;
2350                         return -1;
2351                 }
2352                 lbcount += *elen;
2353         } while (lbcount <= bcount);
2354         /* update extent cache */
2355         udf_update_extent_cache(inode, lbcount - *elen, pos);
2356         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2357
2358         return etype;
2359 }
2360
2361 udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
2362 {
2363         struct kernel_lb_addr eloc;
2364         uint32_t elen;
2365         sector_t offset;
2366         struct extent_position epos = {};
2367         udf_pblk_t ret;
2368
2369         down_read(&UDF_I(inode)->i_data_sem);
2370
2371         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2372                                                 (EXT_RECORDED_ALLOCATED >> 30))
2373                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2374         else
2375                 ret = 0;
2376
2377         up_read(&UDF_I(inode)->i_data_sem);
2378         brelse(epos.bh);
2379
2380         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2381                 return udf_fixed_to_variable(ret);
2382         else
2383                 return ret;
2384 }