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 int8_t 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 void 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 (!inode->i_nlink && !is_bad_inode(inode)) {
 143                 want_delete = 1;
 144                 udf_setsize(inode, 0);
 145                 udf_update_inode(inode, IS_SYNC(inode));
 146         }
 147         truncate_inode_pages_final(&inode->i_data);
 148         invalidate_inode_buffers(inode);
 149         clear_inode(inode);
 150         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB &&
 151             inode->i_size != iinfo->i_lenExtents) {
 152                 udf_warn(inode->i_sb, "Inode %lu (mode %o) has inode size %llu different from extent length %llu. Filesystem need not be standards compliant.\n",
 153                          inode->i_ino, inode->i_mode,
 154                          (unsigned long long)inode->i_size,
 155                          (unsigned long long)iinfo->i_lenExtents);
 156         }
 157         kfree(iinfo->i_ext.i_data);
 158         iinfo->i_ext.i_data = NULL;
 159         udf_clear_extent_cache(inode);
 160         if (want_delete) {
 161                 udf_free_inode(inode);
 162         }
 163 }
 164
 165 static void udf_write_failed(struct address_space *mapping, loff_t to)
 166 {
 167         struct inode *inode = mapping->host;
 168         struct udf_inode_info *iinfo = UDF_I(inode);
 169         loff_t isize = inode->i_size;
 170
 171         if (to > isize) {
 172                 truncate_pagecache(inode, isize);
 173                 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 174                         down_write(&iinfo->i_data_sem);
 175                         udf_clear_extent_cache(inode);
 176                         udf_truncate_extents(inode);
 177                         up_write(&iinfo->i_data_sem);
 178                 }
 179         }
 180 }
 181
 182 static int udf_writepage(struct page *page, struct writeback_control *wbc)
 183 {
 184         return block_write_full_page(page, udf_get_block, wbc);
 185 }
 186
 187 static int udf_writepages(struct address_space *mapping,
 188                         struct writeback_control *wbc)
 189 {
 190         return mpage_writepages(mapping, wbc, udf_get_block);
 191 }
 192
 193 static int udf_readpage(struct file *file, struct page *page)
 194 {
 195         return mpage_readpage(page, udf_get_block);
 196 }
 197
 198 static void udf_readahead(struct readahead_control *rac)
 199 {
 200         mpage_readahead(rac, udf_get_block);
 201 }
 202
 203 static int udf_write_begin(struct file *file, struct address_space *mapping,
 204                         loff_t pos, unsigned len, unsigned flags,
 205                         struct page **pagep, void **fsdata)
 206 {
 207         int ret;
 208
 209         ret = block_write_begin(mapping, pos, len, flags, pagep, udf_get_block);
 210         if (unlikely(ret))
 211                 udf_write_failed(mapping, pos + len);
 212         return ret;
 213 }
 214
 215 static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 216 {
 217         struct file *file = iocb->ki_filp;
 218         struct address_space *mapping = file->f_mapping;
 219         struct inode *inode = mapping->host;
 220         size_t count = iov_iter_count(iter);
 221         ssize_t ret;
 222
 223         ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
 224         if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
 225                 udf_write_failed(mapping, iocb->ki_pos + count);
 226         return ret;
 227 }
 228
 229 static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 230 {
 231         return generic_block_bmap(mapping, block, udf_get_block);
 232 }
 233
 234 const struct address_space_operations udf_aops = {
 235         .readpage       = udf_readpage,
 236         .readahead      = udf_readahead,
 237         .writepage      = udf_writepage,
 238         .writepages     = udf_writepages,
 239         .write_begin    = udf_write_begin,
 240         .write_end      = generic_write_end,
 241         .direct_IO      = udf_direct_IO,
 242         .bmap           = udf_bmap,
 243 };
 244
 245 /*
 246  * Expand file stored in ICB to a normal one-block-file
 247  *
 248  * This function requires i_data_sem for writing and releases it.
 249  * This function requires i_mutex held
 250  */
 251 int udf_expand_file_adinicb(struct inode *inode)
 252 {
 253         struct page *page;
 254         char *kaddr;
 255         struct udf_inode_info *iinfo = UDF_I(inode);
 256         int err;
 257         struct writeback_control udf_wbc = {
 258                 .sync_mode = WB_SYNC_NONE,
 259                 .nr_to_write = 1,
 260         };
 261
 262         WARN_ON_ONCE(!inode_is_locked(inode));
 263         if (!iinfo->i_lenAlloc) {
 264                 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 265                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 266                 else
 267                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 268                 /* from now on we have normal address_space methods */
 269                 inode->i_data.a_ops = &udf_aops;
 270                 up_write(&iinfo->i_data_sem);
 271                 mark_inode_dirty(inode);
 272                 return 0;
 273         }
 274         /*
 275          * Release i_data_sem so that we can lock a page - page lock ranks
 276          * above i_data_sem. i_mutex still protects us against file changes.
 277          */
 278         up_write(&iinfo->i_data_sem);
 279
 280         page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
 281         if (!page)
 282                 return -ENOMEM;
 283
 284         if (!PageUptodate(page)) {
 285                 kaddr = kmap_atomic(page);
 286                 memset(kaddr + iinfo->i_lenAlloc, 0x00,
 287                        PAGE_SIZE - iinfo->i_lenAlloc);
 288                 memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr,
 289                         iinfo->i_lenAlloc);
 290                 flush_dcache_page(page);
 291                 SetPageUptodate(page);
 292                 kunmap_atomic(kaddr);
 293         }
 294         down_write(&iinfo->i_data_sem);
 295         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0x00,
 296                iinfo->i_lenAlloc);
 297         iinfo->i_lenAlloc = 0;
 298         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 299                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
 300         else
 301                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 302         /* from now on we have normal address_space methods */
 303         inode->i_data.a_ops = &udf_aops;
 304         up_write(&iinfo->i_data_sem);
 305         err = inode->i_data.a_ops->writepage(page, &udf_wbc);
 306         if (err) {
 307                 /* Restore everything back so that we don't lose data... */
 308                 lock_page(page);
 309                 down_write(&iinfo->i_data_sem);
 310                 kaddr = kmap_atomic(page);
 311                 memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr,
 312                        inode->i_size);
 313                 kunmap_atomic(kaddr);
 314                 unlock_page(page);
 315                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 316                 inode->i_data.a_ops = &udf_adinicb_aops;
 317                 up_write(&iinfo->i_data_sem);
 318         }
 319         put_page(page);
 320         mark_inode_dirty(inode);
 321
 322         return err;
 323 }
 324
 325 struct buffer_head *udf_expand_dir_adinicb(struct inode *inode,
 326                                             udf_pblk_t *block, int *err)
 327 {
 328         udf_pblk_t newblock;
 329         struct buffer_head *dbh = NULL;
 330         struct kernel_lb_addr eloc;
 331         uint8_t alloctype;
 332         struct extent_position epos;
 333
 334         struct udf_fileident_bh sfibh, dfibh;
 335         loff_t f_pos = udf_ext0_offset(inode);
 336         int size = udf_ext0_offset(inode) + inode->i_size;
 337         struct fileIdentDesc cfi, *sfi, *dfi;
 338         struct udf_inode_info *iinfo = UDF_I(inode);
 339
 340         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 341                 alloctype = ICBTAG_FLAG_AD_SHORT;
 342         else
 343                 alloctype = ICBTAG_FLAG_AD_LONG;
 344
 345         if (!inode->i_size) {
 346                 iinfo->i_alloc_type = alloctype;
 347                 mark_inode_dirty(inode);
 348                 return NULL;
 349         }
 350
 351         /* alloc block, and copy data to it */
 352         *block = udf_new_block(inode->i_sb, inode,
 353                                iinfo->i_location.partitionReferenceNum,
 354                                iinfo->i_location.logicalBlockNum, err);
 355         if (!(*block))
 356                 return NULL;
 357         newblock = udf_get_pblock(inode->i_sb, *block,
 358                                   iinfo->i_location.partitionReferenceNum,
 359                                 0);
 360         if (!newblock)
 361                 return NULL;
 362         dbh = udf_tgetblk(inode->i_sb, newblock);
 363         if (!dbh)
 364                 return NULL;
 365         lock_buffer(dbh);
 366         memset(dbh->b_data, 0x00, inode->i_sb->s_blocksize);
 367         set_buffer_uptodate(dbh);
 368         unlock_buffer(dbh);
 369         mark_buffer_dirty_inode(dbh, inode);
 370
 371         sfibh.soffset = sfibh.eoffset =
 372                         f_pos & (inode->i_sb->s_blocksize - 1);
 373         sfibh.sbh = sfibh.ebh = NULL;
 374         dfibh.soffset = dfibh.eoffset = 0;
 375         dfibh.sbh = dfibh.ebh = dbh;
 376         while (f_pos < size) {
 377                 iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 378                 sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
 379                                          NULL, NULL, NULL);
 380                 if (!sfi) {
 381                         brelse(dbh);
 382                         return NULL;
 383                 }
 384                 iinfo->i_alloc_type = alloctype;
 385                 sfi->descTag.tagLocation = cpu_to_le32(*block);
 386                 dfibh.soffset = dfibh.eoffset;
 387                 dfibh.eoffset += (sfibh.eoffset - sfibh.soffset);
 388                 dfi = (struct fileIdentDesc *)(dbh->b_data + dfibh.soffset);
 389                 if (udf_write_fi(inode, sfi, dfi, &dfibh, sfi->impUse,
 390                                  sfi->fileIdent +
 391                                         le16_to_cpu(sfi->lengthOfImpUse))) {
 392                         iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 393                         brelse(dbh);
 394                         return NULL;
 395                 }
 396         }
 397         mark_buffer_dirty_inode(dbh, inode);
 398
 399         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr, 0,
 400                 iinfo->i_lenAlloc);
 401         iinfo->i_lenAlloc = 0;
 402         eloc.logicalBlockNum = *block;
 403         eloc.partitionReferenceNum =
 404                                 iinfo->i_location.partitionReferenceNum;
 405         iinfo->i_lenExtents = inode->i_size;
 406         epos.bh = NULL;
 407         epos.block = iinfo->i_location;
 408         epos.offset = udf_file_entry_alloc_offset(inode);
 409         udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 410         /* UniqueID stuff */
 411
 412         brelse(epos.bh);
 413         mark_inode_dirty(inode);
 414         return dbh;
 415 }
 416
 417 static int udf_get_block(struct inode *inode, sector_t block,
 418                          struct buffer_head *bh_result, int create)
 419 {
 420         int err, new;
 421         sector_t phys = 0;
 422         struct udf_inode_info *iinfo;
 423
 424         if (!create) {
 425                 phys = udf_block_map(inode, block);
 426                 if (phys)
 427                         map_bh(bh_result, inode->i_sb, phys);
 428                 return 0;
 429         }
 430
 431         err = -EIO;
 432         new = 0;
 433         iinfo = UDF_I(inode);
 434
 435         down_write(&iinfo->i_data_sem);
 436         if (block == iinfo->i_next_alloc_block + 1) {
 437                 iinfo->i_next_alloc_block++;
 438                 iinfo->i_next_alloc_goal++;
 439         }
 440
 441         udf_clear_extent_cache(inode);
 442         phys = inode_getblk(inode, block, &err, &new);
 443         if (!phys)
 444                 goto abort;
 445
 446         if (new)
 447                 set_buffer_new(bh_result);
 448         map_bh(bh_result, inode->i_sb, phys);
 449
 450 abort:
 451         up_write(&iinfo->i_data_sem);
 452         return err;
 453 }
 454
 455 static struct buffer_head *udf_getblk(struct inode *inode, udf_pblk_t block,
 456                                       int create, int *err)
 457 {
 458         struct buffer_head *bh;
 459         struct buffer_head dummy;
 460
 461         dummy.b_state = 0;
 462         dummy.b_blocknr = -1000;
 463         *err = udf_get_block(inode, block, &dummy, create);
 464         if (!*err && buffer_mapped(&dummy)) {
 465                 bh = sb_getblk(inode->i_sb, dummy.b_blocknr);
 466                 if (buffer_new(&dummy)) {
 467                         lock_buffer(bh);
 468                         memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 469                         set_buffer_uptodate(bh);
 470                         unlock_buffer(bh);
 471                         mark_buffer_dirty_inode(bh, inode);
 472                 }
 473                 return bh;
 474         }
 475
 476         return NULL;
 477 }
 478
 479 /* Extend the file with new blocks totaling 'new_block_bytes',
 480  * return the number of extents added
 481  */
 482 static int udf_do_extend_file(struct inode *inode,
 483                               struct extent_position *last_pos,
 484                               struct kernel_long_ad *last_ext,
 485                               loff_t new_block_bytes)
 486 {
 487         uint32_t add;
 488         int count = 0, fake = !(last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 489         struct super_block *sb = inode->i_sb;
 490         struct kernel_lb_addr prealloc_loc = {};
 491         uint32_t prealloc_len = 0;
 492         struct udf_inode_info *iinfo;
 493         int err;
 494
 495         /* The previous extent is fake and we should not extend by anything
 496          * - there's nothing to do... */
 497         if (!new_block_bytes && fake)
 498                 return 0;
 499
 500         iinfo = UDF_I(inode);
 501         /* Round the last extent up to a multiple of block size */
 502         if (last_ext->extLength & (sb->s_blocksize - 1)) {
 503                 last_ext->extLength =
 504                         (last_ext->extLength & UDF_EXTENT_FLAG_MASK) |
 505                         (((last_ext->extLength & UDF_EXTENT_LENGTH_MASK) +
 506                           sb->s_blocksize - 1) & ~(sb->s_blocksize - 1));
 507                 iinfo->i_lenExtents =
 508                         (iinfo->i_lenExtents + sb->s_blocksize - 1) &
 509                         ~(sb->s_blocksize - 1);
 510         }
 511
 512         /* Last extent are just preallocated blocks? */
 513         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 514                                                 EXT_NOT_RECORDED_ALLOCATED) {
 515                 /* Save the extent so that we can reattach it to the end */
 516                 prealloc_loc = last_ext->extLocation;
 517                 prealloc_len = last_ext->extLength;
 518                 /* Mark the extent as a hole */
 519                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 520                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 521                 last_ext->extLocation.logicalBlockNum = 0;
 522                 last_ext->extLocation.partitionReferenceNum = 0;
 523         }
 524
 525         /* Can we merge with the previous extent? */
 526         if ((last_ext->extLength & UDF_EXTENT_FLAG_MASK) ==
 527                                         EXT_NOT_RECORDED_NOT_ALLOCATED) {
 528                 add = (1 << 30) - sb->s_blocksize -
 529                         (last_ext->extLength & UDF_EXTENT_LENGTH_MASK);
 530                 if (add > new_block_bytes)
 531                         add = new_block_bytes;
 532                 new_block_bytes -= add;
 533                 last_ext->extLength += add;
 534         }
 535
 536         if (fake) {
 537                 udf_add_aext(inode, last_pos, &last_ext->extLocation,
 538                              last_ext->extLength, 1);
 539                 count++;
 540         } else {
 541                 struct kernel_lb_addr tmploc;
 542                 uint32_t tmplen;
 543
 544                 udf_write_aext(inode, last_pos, &last_ext->extLocation,
 545                                 last_ext->extLength, 1);
 546                 /*
 547                  * We've rewritten the last extent but there may be empty
 548                  * indirect extent after it - enter it.
 549                  */
 550                 udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
 551         }
 552
 553         /* Managed to do everything necessary? */
 554         if (!new_block_bytes)
 555                 goto out;
 556
 557         /* All further extents will be NOT_RECORDED_NOT_ALLOCATED */
 558         last_ext->extLocation.logicalBlockNum = 0;
 559         last_ext->extLocation.partitionReferenceNum = 0;
 560         add = (1 << 30) - sb->s_blocksize;
 561         last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED | add;
 562
 563         /* Create enough extents to cover the whole hole */
 564         while (new_block_bytes > add) {
 565                 new_block_bytes -= add;
 566                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 567                                    last_ext->extLength, 1);
 568                 if (err)
 569                         return err;
 570                 count++;
 571         }
 572         if (new_block_bytes) {
 573                 last_ext->extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 574                         new_block_bytes;
 575                 err = udf_add_aext(inode, last_pos, &last_ext->extLocation,
 576                                    last_ext->extLength, 1);
 577                 if (err)
 578                         return err;
 579                 count++;
 580         }
 581
 582 out:
 583         /* Do we have some preallocated blocks saved? */
 584         if (prealloc_len) {
 585                 err = udf_add_aext(inode, last_pos, &prealloc_loc,
 586                                    prealloc_len, 1);
 587                 if (err)
 588                         return err;
 589                 last_ext->extLocation = prealloc_loc;
 590                 last_ext->extLength = prealloc_len;
 591                 count++;
 592         }
 593
 594         /* last_pos should point to the last written extent... */
 595         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 596                 last_pos->offset -= sizeof(struct short_ad);
 597         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 598                 last_pos->offset -= sizeof(struct long_ad);
 599         else
 600                 return -EIO;
 601
 602         return count;
 603 }
 604
 605 /* Extend the final block of the file to final_block_len bytes */
 606 static void udf_do_extend_final_block(struct inode *inode,
 607                                       struct extent_position *last_pos,
 608                                       struct kernel_long_ad *last_ext,
 609                                       uint32_t final_block_len)
 610 {
 611         struct super_block *sb = inode->i_sb;
 612         uint32_t added_bytes;
 613
 614         added_bytes = final_block_len -
 615                       (last_ext->extLength & (sb->s_blocksize - 1));
 616         last_ext->extLength += added_bytes;
 617         UDF_I(inode)->i_lenExtents += added_bytes;
 618
 619         udf_write_aext(inode, last_pos, &last_ext->extLocation,
 620                         last_ext->extLength, 1);
 621 }
 622
 623 static int udf_extend_file(struct inode *inode, loff_t newsize)
 624 {
 625
 626         struct extent_position epos;
 627         struct kernel_lb_addr eloc;
 628         uint32_t elen;
 629         int8_t etype;
 630         struct super_block *sb = inode->i_sb;
 631         sector_t first_block = newsize >> sb->s_blocksize_bits, offset;
 632         unsigned long partial_final_block;
 633         int adsize;
 634         struct udf_inode_info *iinfo = UDF_I(inode);
 635         struct kernel_long_ad extent;
 636         int err = 0;
 637         int within_final_block;
 638
 639         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 640                 adsize = sizeof(struct short_ad);
 641         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 642                 adsize = sizeof(struct long_ad);
 643         else
 644                 BUG();
 645
 646         etype = inode_bmap(inode, first_block, &epos, &eloc, &elen, &offset);
 647         within_final_block = (etype != -1);
 648
 649         if ((!epos.bh && epos.offset == udf_file_entry_alloc_offset(inode)) ||
 650             (epos.bh && epos.offset == sizeof(struct allocExtDesc))) {
 651                 /* File has no extents at all or has empty last
 652                  * indirect extent! Create a fake extent... */
 653                 extent.extLocation.logicalBlockNum = 0;
 654                 extent.extLocation.partitionReferenceNum = 0;
 655                 extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 656         } else {
 657                 epos.offset -= adsize;
 658                 etype = udf_next_aext(inode, &epos, &extent.extLocation,
 659                                       &extent.extLength, 0);
 660                 extent.extLength |= etype << 30;
 661         }
 662
 663         partial_final_block = newsize & (sb->s_blocksize - 1);
 664
 665         /* File has extent covering the new size (could happen when extending
 666          * inside a block)?
 667          */
 668         if (within_final_block) {
 669                 /* Extending file within the last file block */
 670                 udf_do_extend_final_block(inode, &epos, &extent,
 671                                           partial_final_block);
 672         } else {
 673                 loff_t add = ((loff_t)offset << sb->s_blocksize_bits) |
 674                              partial_final_block;
 675                 err = udf_do_extend_file(inode, &epos, &extent, add);
 676         }
 677
 678         if (err < 0)
 679                 goto out;
 680         err = 0;
 681         iinfo->i_lenExtents = newsize;
 682 out:
 683         brelse(epos.bh);
 684         return err;
 685 }
 686
 687 static sector_t inode_getblk(struct inode *inode, sector_t block,
 688                              int *err, int *new)
 689 {
 690         struct kernel_long_ad laarr[EXTENT_MERGE_SIZE];
 691         struct extent_position prev_epos, cur_epos, next_epos;
 692         int count = 0, startnum = 0, endnum = 0;
 693         uint32_t elen = 0, tmpelen;
 694         struct kernel_lb_addr eloc, tmpeloc;
 695         int c = 1;
 696         loff_t lbcount = 0, b_off = 0;
 697         udf_pblk_t newblocknum, newblock;
 698         sector_t offset = 0;
 699         int8_t etype;
 700         struct udf_inode_info *iinfo = UDF_I(inode);
 701         udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
 702         int lastblock = 0;
 703         bool isBeyondEOF;
 704
 705         *err = 0;
 706         *new = 0;
 707         prev_epos.offset = udf_file_entry_alloc_offset(inode);
 708         prev_epos.block = iinfo->i_location;
 709         prev_epos.bh = NULL;
 710         cur_epos = next_epos = prev_epos;
 711         b_off = (loff_t)block << inode->i_sb->s_blocksize_bits;
 712
 713         /* find the extent which contains the block we are looking for.
 714            alternate between laarr[0] and laarr[1] for locations of the
 715            current extent, and the previous extent */
 716         do {
 717                 if (prev_epos.bh != cur_epos.bh) {
 718                         brelse(prev_epos.bh);
 719                         get_bh(cur_epos.bh);
 720                         prev_epos.bh = cur_epos.bh;
 721                 }
 722                 if (cur_epos.bh != next_epos.bh) {
 723                         brelse(cur_epos.bh);
 724                         get_bh(next_epos.bh);
 725                         cur_epos.bh = next_epos.bh;
 726                 }
 727
 728                 lbcount += elen;
 729
 730                 prev_epos.block = cur_epos.block;
 731                 cur_epos.block = next_epos.block;
 732
 733                 prev_epos.offset = cur_epos.offset;
 734                 cur_epos.offset = next_epos.offset;
 735
 736                 etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
 737                 if (etype == -1)
 738                         break;
 739
 740                 c = !c;
 741
 742                 laarr[c].extLength = (etype << 30) | elen;
 743                 laarr[c].extLocation = eloc;
 744
 745                 if (etype != (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 746                         pgoal = eloc.logicalBlockNum +
 747                                 ((elen + inode->i_sb->s_blocksize - 1) >>
 748                                  inode->i_sb->s_blocksize_bits);
 749
 750                 count++;
 751         } while (lbcount + elen <= b_off);
 752
 753         b_off -= lbcount;
 754         offset = b_off >> inode->i_sb->s_blocksize_bits;
 755         /*
 756          * Move prev_epos and cur_epos into indirect extent if we are at
 757          * the pointer to it
 758          */
 759         udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
 760         udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
 761
 762         /* if the extent is allocated and recorded, return the block
 763            if the extent is not a multiple of the blocksize, round up */
 764
 765         if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
 766                 if (elen & (inode->i_sb->s_blocksize - 1)) {
 767                         elen = EXT_RECORDED_ALLOCATED |
 768                                 ((elen + inode->i_sb->s_blocksize - 1) &
 769                                  ~(inode->i_sb->s_blocksize - 1));
 770                         udf_write_aext(inode, &cur_epos, &eloc, elen, 1);
 771                 }
 772                 newblock = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
 773                 goto out_free;
 774         }
 775
 776         /* Are we beyond EOF? */
 777         if (etype == -1) {
 778                 int ret;
 779                 loff_t hole_len;
 780                 isBeyondEOF = true;
 781                 if (count) {
 782                         if (c)
 783                                 laarr[0] = laarr[1];
 784                         startnum = 1;
 785                 } else {
 786                         /* Create a fake extent when there's not one */
 787                         memset(&laarr[0].extLocation, 0x00,
 788                                 sizeof(struct kernel_lb_addr));
 789                         laarr[0].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
 790                         /* Will udf_do_extend_file() create real extent from
 791                            a fake one? */
 792                         startnum = (offset > 0);
 793                 }
 794                 /* Create extents for the hole between EOF and offset */
 795                 hole_len = (loff_t)offset << inode->i_blkbits;
 796                 ret = udf_do_extend_file(inode, &prev_epos, laarr, hole_len);
 797                 if (ret < 0) {
 798                         *err = ret;
 799                         newblock = 0;
 800                         goto out_free;
 801                 }
 802                 c = 0;
 803                 offset = 0;
 804                 count += ret;
 805                 /* We are not covered by a preallocated extent? */
 806                 if ((laarr[0].extLength & UDF_EXTENT_FLAG_MASK) !=
 807                                                 EXT_NOT_RECORDED_ALLOCATED) {
 808                         /* Is there any real extent? - otherwise we overwrite
 809                          * the fake one... */
 810                         if (count)
 811                                 c = !c;
 812                         laarr[c].extLength = EXT_NOT_RECORDED_NOT_ALLOCATED |
 813                                 inode->i_sb->s_blocksize;
 814                         memset(&laarr[c].extLocation, 0x00,
 815                                 sizeof(struct kernel_lb_addr));
 816                         count++;
 817                 }
 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                         newblock = 0;
 865                         goto out_free;
 866                 }
 867                 if (isBeyondEOF)
 868                         iinfo->i_lenExtents += inode->i_sb->s_blocksize;
 869         }
 870
 871         /* if the extent the requsted block is located in contains multiple
 872          * blocks, split the extent into at most three extents. blocks prior
 873          * to requested block, requested block, and blocks after requested
 874          * block */
 875         udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum);
 876
 877         /* We preallocate blocks only for regular files. It also makes sense
 878          * for directories but there's a problem when to drop the
 879          * preallocation. We might use some delayed work for that but I feel
 880          * it's overengineering for a filesystem like UDF. */
 881         if (S_ISREG(inode->i_mode))
 882                 udf_prealloc_extents(inode, c, lastblock, laarr, &endnum);
 883
 884         /* merge any continuous blocks in laarr */
 885         udf_merge_extents(inode, laarr, &endnum);
 886
 887         /* write back the new extents, inserting new extents if the new number
 888          * of extents is greater than the old number, and deleting extents if
 889          * the new number of extents is less than the old number */
 890         udf_update_extents(inode, laarr, startnum, endnum, &prev_epos);
 891
 892         newblock = udf_get_pblock(inode->i_sb, newblocknum,
 893                                 iinfo->i_location.partitionReferenceNum, 0);
 894         if (!newblock) {
 895                 *err = -EIO;
 896                 goto out_free;
 897         }
 898         *new = 1;
 899         iinfo->i_next_alloc_block = block;
 900         iinfo->i_next_alloc_goal = newblocknum;
 901         inode->i_ctime = current_time(inode);
 902
 903         if (IS_SYNC(inode))
 904                 udf_sync_inode(inode);
 905         else
 906                 mark_inode_dirty(inode);
 907 out_free:
 908         brelse(prev_epos.bh);
 909         brelse(cur_epos.bh);
 910         brelse(next_epos.bh);
 911         return newblock;
 912 }
 913
 914 static void udf_split_extents(struct inode *inode, int *c, int offset,
 915                                udf_pblk_t newblocknum,
 916                                struct kernel_long_ad *laarr, int *endnum)
 917 {
 918         unsigned long blocksize = inode->i_sb->s_blocksize;
 919         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
 920
 921         if ((laarr[*c].extLength >> 30) == (EXT_NOT_RECORDED_ALLOCATED >> 30) ||
 922             (laarr[*c].extLength >> 30) ==
 923                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
 924                 int curr = *c;
 925                 int blen = ((laarr[curr].extLength & UDF_EXTENT_LENGTH_MASK) +
 926                             blocksize - 1) >> blocksize_bits;
 927                 int8_t etype = (laarr[curr].extLength >> 30);
 928
 929                 if (blen == 1)
 930                         ;
 931                 else if (!offset || blen == offset + 1) {
 932                         laarr[curr + 2] = laarr[curr + 1];
 933                         laarr[curr + 1] = laarr[curr];
 934                 } else {
 935                         laarr[curr + 3] = laarr[curr + 1];
 936                         laarr[curr + 2] = laarr[curr + 1] = laarr[curr];
 937                 }
 938
 939                 if (offset) {
 940                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 941                                 udf_free_blocks(inode->i_sb, inode,
 942                                                 &laarr[curr].extLocation,
 943                                                 0, offset);
 944                                 laarr[curr].extLength =
 945                                         EXT_NOT_RECORDED_NOT_ALLOCATED |
 946                                         (offset << blocksize_bits);
 947                                 laarr[curr].extLocation.logicalBlockNum = 0;
 948                                 laarr[curr].extLocation.
 949                                                 partitionReferenceNum = 0;
 950                         } else
 951                                 laarr[curr].extLength = (etype << 30) |
 952                                         (offset << blocksize_bits);
 953                         curr++;
 954                         (*c)++;
 955                         (*endnum)++;
 956                 }
 957
 958                 laarr[curr].extLocation.logicalBlockNum = newblocknum;
 959                 if (etype == (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))
 960                         laarr[curr].extLocation.partitionReferenceNum =
 961                                 UDF_I(inode)->i_location.partitionReferenceNum;
 962                 laarr[curr].extLength = EXT_RECORDED_ALLOCATED |
 963                         blocksize;
 964                 curr++;
 965
 966                 if (blen != offset + 1) {
 967                         if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30))
 968                                 laarr[curr].extLocation.logicalBlockNum +=
 969                                                                 offset + 1;
 970                         laarr[curr].extLength = (etype << 30) |
 971                                 ((blen - (offset + 1)) << blocksize_bits);
 972                         curr++;
 973                         (*endnum)++;
 974                 }
 975         }
 976 }
 977
 978 static void udf_prealloc_extents(struct inode *inode, int c, int lastblock,
 979                                  struct kernel_long_ad *laarr,
 980                                  int *endnum)
 981 {
 982         int start, length = 0, currlength = 0, i;
 983
 984         if (*endnum >= (c + 1)) {
 985                 if (!lastblock)
 986                         return;
 987                 else
 988                         start = c;
 989         } else {
 990                 if ((laarr[c + 1].extLength >> 30) ==
 991                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
 992                         start = c + 1;
 993                         length = currlength =
 994                                 (((laarr[c + 1].extLength &
 995                                         UDF_EXTENT_LENGTH_MASK) +
 996                                 inode->i_sb->s_blocksize - 1) >>
 997                                 inode->i_sb->s_blocksize_bits);
 998                 } else
 999                         start = c;
1000         }
1001
1002         for (i = start + 1; i <= *endnum; i++) {
1003                 if (i == *endnum) {
1004                         if (lastblock)
1005                                 length += UDF_DEFAULT_PREALLOC_BLOCKS;
1006                 } else if ((laarr[i].extLength >> 30) ==
1007                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) {
1008                         length += (((laarr[i].extLength &
1009                                                 UDF_EXTENT_LENGTH_MASK) +
1010                                     inode->i_sb->s_blocksize - 1) >>
1011                                     inode->i_sb->s_blocksize_bits);
1012                 } else
1013                         break;
1014         }
1015
1016         if (length) {
1017                 int next = laarr[start].extLocation.logicalBlockNum +
1018                         (((laarr[start].extLength & UDF_EXTENT_LENGTH_MASK) +
1019                           inode->i_sb->s_blocksize - 1) >>
1020                           inode->i_sb->s_blocksize_bits);
1021                 int numalloc = udf_prealloc_blocks(inode->i_sb, inode,
1022                                 laarr[start].extLocation.partitionReferenceNum,
1023                                 next, (UDF_DEFAULT_PREALLOC_BLOCKS > length ?
1024                                 length : UDF_DEFAULT_PREALLOC_BLOCKS) -
1025                                 currlength);
1026                 if (numalloc)   {
1027                         if (start == (c + 1))
1028                                 laarr[start].extLength +=
1029                                         (numalloc <<
1030                                          inode->i_sb->s_blocksize_bits);
1031                         else {
1032                                 memmove(&laarr[c + 2], &laarr[c + 1],
1033                                         sizeof(struct long_ad) * (*endnum - (c + 1)));
1034                                 (*endnum)++;
1035                                 laarr[c + 1].extLocation.logicalBlockNum = next;
1036                                 laarr[c + 1].extLocation.partitionReferenceNum =
1037                                         laarr[c].extLocation.
1038                                                         partitionReferenceNum;
1039                                 laarr[c + 1].extLength =
1040                                         EXT_NOT_RECORDED_ALLOCATED |
1041                                         (numalloc <<
1042                                          inode->i_sb->s_blocksize_bits);
1043                                 start = c + 1;
1044                         }
1045
1046                         for (i = start + 1; numalloc && i < *endnum; i++) {
1047                                 int elen = ((laarr[i].extLength &
1048                                                 UDF_EXTENT_LENGTH_MASK) +
1049                                             inode->i_sb->s_blocksize - 1) >>
1050                                             inode->i_sb->s_blocksize_bits;
1051
1052                                 if (elen > numalloc) {
1053                                         laarr[i].extLength -=
1054                                                 (numalloc <<
1055                                                  inode->i_sb->s_blocksize_bits);
1056                                         numalloc = 0;
1057                                 } else {
1058                                         numalloc -= elen;
1059                                         if (*endnum > (i + 1))
1060                                                 memmove(&laarr[i],
1061                                                         &laarr[i + 1],
1062                                                         sizeof(struct long_ad) *
1063                                                         (*endnum - (i + 1)));
1064                                         i--;
1065                                         (*endnum)--;
1066                                 }
1067                         }
1068                         UDF_I(inode)->i_lenExtents +=
1069                                 numalloc << inode->i_sb->s_blocksize_bits;
1070                 }
1071         }
1072 }
1073
1074 static void udf_merge_extents(struct inode *inode, struct kernel_long_ad *laarr,
1075                               int *endnum)
1076 {
1077         int i;
1078         unsigned long blocksize = inode->i_sb->s_blocksize;
1079         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1080
1081         for (i = 0; i < (*endnum - 1); i++) {
1082                 struct kernel_long_ad *li /*l[i]*/ = &laarr[i];
1083                 struct kernel_long_ad *lip1 /*l[i plus 1]*/ = &laarr[i + 1];
1084
1085                 if (((li->extLength >> 30) == (lip1->extLength >> 30)) &&
1086                         (((li->extLength >> 30) ==
1087                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30)) ||
1088                         ((lip1->extLocation.logicalBlockNum -
1089                           li->extLocation.logicalBlockNum) ==
1090                         (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1091                         blocksize - 1) >> blocksize_bits)))) {
1092
1093                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1094                                 (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1095                                 blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1096                                 lip1->extLength = (lip1->extLength -
1097                                                   (li->extLength &
1098                                                    UDF_EXTENT_LENGTH_MASK) +
1099                                                    UDF_EXTENT_LENGTH_MASK) &
1100                                                         ~(blocksize - 1);
1101                                 li->extLength = (li->extLength &
1102                                                  UDF_EXTENT_FLAG_MASK) +
1103                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1104                                                 blocksize;
1105                                 lip1->extLocation.logicalBlockNum =
1106                                         li->extLocation.logicalBlockNum +
1107                                         ((li->extLength &
1108                                                 UDF_EXTENT_LENGTH_MASK) >>
1109                                                 blocksize_bits);
1110                         } else {
1111                                 li->extLength = lip1->extLength +
1112                                         (((li->extLength &
1113                                                 UDF_EXTENT_LENGTH_MASK) +
1114                                          blocksize - 1) & ~(blocksize - 1));
1115                                 if (*endnum > (i + 2))
1116                                         memmove(&laarr[i + 1], &laarr[i + 2],
1117                                                 sizeof(struct long_ad) *
1118                                                 (*endnum - (i + 2)));
1119                                 i--;
1120                                 (*endnum)--;
1121                         }
1122                 } else if (((li->extLength >> 30) ==
1123                                 (EXT_NOT_RECORDED_ALLOCATED >> 30)) &&
1124                            ((lip1->extLength >> 30) ==
1125                                 (EXT_NOT_RECORDED_NOT_ALLOCATED >> 30))) {
1126                         udf_free_blocks(inode->i_sb, inode, &li->extLocation, 0,
1127                                         ((li->extLength &
1128                                           UDF_EXTENT_LENGTH_MASK) +
1129                                          blocksize - 1) >> blocksize_bits);
1130                         li->extLocation.logicalBlockNum = 0;
1131                         li->extLocation.partitionReferenceNum = 0;
1132
1133                         if (((li->extLength & UDF_EXTENT_LENGTH_MASK) +
1134                              (lip1->extLength & UDF_EXTENT_LENGTH_MASK) +
1135                              blocksize - 1) & ~UDF_EXTENT_LENGTH_MASK) {
1136                                 lip1->extLength = (lip1->extLength -
1137                                                    (li->extLength &
1138                                                    UDF_EXTENT_LENGTH_MASK) +
1139                                                    UDF_EXTENT_LENGTH_MASK) &
1140                                                    ~(blocksize - 1);
1141                                 li->extLength = (li->extLength &
1142                                                  UDF_EXTENT_FLAG_MASK) +
1143                                                 (UDF_EXTENT_LENGTH_MASK + 1) -
1144                                                 blocksize;
1145                         } else {
1146                                 li->extLength = lip1->extLength +
1147                                         (((li->extLength &
1148                                                 UDF_EXTENT_LENGTH_MASK) +
1149                                           blocksize - 1) & ~(blocksize - 1));
1150                                 if (*endnum > (i + 2))
1151                                         memmove(&laarr[i + 1], &laarr[i + 2],
1152                                                 sizeof(struct long_ad) *
1153                                                 (*endnum - (i + 2)));
1154                                 i--;
1155                                 (*endnum)--;
1156                         }
1157                 } else if ((li->extLength >> 30) ==
1158                                         (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
1159                         udf_free_blocks(inode->i_sb, inode,
1160                                         &li->extLocation, 0,
1161                                         ((li->extLength &
1162                                                 UDF_EXTENT_LENGTH_MASK) +
1163                                          blocksize - 1) >> blocksize_bits);
1164                         li->extLocation.logicalBlockNum = 0;
1165                         li->extLocation.partitionReferenceNum = 0;
1166                         li->extLength = (li->extLength &
1167                                                 UDF_EXTENT_LENGTH_MASK) |
1168                                                 EXT_NOT_RECORDED_NOT_ALLOCATED;
1169                 }
1170         }
1171 }
1172
1173 static void udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
1174                                int startnum, int endnum,
1175                                struct extent_position *epos)
1176 {
1177         int start = 0, i;
1178         struct kernel_lb_addr tmploc;
1179         uint32_t tmplen;
1180
1181         if (startnum > endnum) {
1182                 for (i = 0; i < (startnum - endnum); i++)
1183                         udf_delete_aext(inode, *epos);
1184         } else if (startnum < endnum) {
1185                 for (i = 0; i < (endnum - startnum); i++) {
1186                         udf_insert_aext(inode, *epos, laarr[i].extLocation,
1187                                         laarr[i].extLength);
1188                         udf_next_aext(inode, epos, &laarr[i].extLocation,
1189                                       &laarr[i].extLength, 1);
1190                         start++;
1191                 }
1192         }
1193
1194         for (i = start; i < endnum; i++) {
1195                 udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
1196                 udf_write_aext(inode, epos, &laarr[i].extLocation,
1197                                laarr[i].extLength, 1);
1198         }
1199 }
1200
1201 struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
1202                               int create, int *err)
1203 {
1204         struct buffer_head *bh = NULL;
1205
1206         bh = udf_getblk(inode, block, create, err);
1207         if (!bh)
1208                 return NULL;
1209
1210         if (buffer_uptodate(bh))
1211                 return bh;
1212
1213         ll_rw_block(REQ_OP_READ, 0, 1, &bh);
1214
1215         wait_on_buffer(bh);
1216         if (buffer_uptodate(bh))
1217                 return bh;
1218
1219         brelse(bh);
1220         *err = -EIO;
1221         return NULL;
1222 }
1223
1224 int udf_setsize(struct inode *inode, loff_t newsize)
1225 {
1226         int err;
1227         struct udf_inode_info *iinfo;
1228         unsigned int bsize = i_blocksize(inode);
1229
1230         if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
1231               S_ISLNK(inode->i_mode)))
1232                 return -EINVAL;
1233         if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1234                 return -EPERM;
1235
1236         iinfo = UDF_I(inode);
1237         if (newsize > inode->i_size) {
1238                 down_write(&iinfo->i_data_sem);
1239                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1240                         if (bsize <
1241                             (udf_file_entry_alloc_offset(inode) + newsize)) {
1242                                 err = udf_expand_file_adinicb(inode);
1243                                 if (err)
1244                                         return err;
1245                                 down_write(&iinfo->i_data_sem);
1246                         } else {
1247                                 iinfo->i_lenAlloc = newsize;
1248                                 goto set_size;
1249                         }
1250                 }
1251                 err = udf_extend_file(inode, newsize);
1252                 if (err) {
1253                         up_write(&iinfo->i_data_sem);
1254                         return err;
1255                 }
1256 set_size:
1257                 up_write(&iinfo->i_data_sem);
1258                 truncate_setsize(inode, newsize);
1259         } else {
1260                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1261                         down_write(&iinfo->i_data_sem);
1262                         udf_clear_extent_cache(inode);
1263                         memset(iinfo->i_ext.i_data + iinfo->i_lenEAttr + newsize,
1264                                0x00, bsize - newsize -
1265                                udf_file_entry_alloc_offset(inode));
1266                         iinfo->i_lenAlloc = newsize;
1267                         truncate_setsize(inode, newsize);
1268                         up_write(&iinfo->i_data_sem);
1269                         goto update_time;
1270                 }
1271                 err = block_truncate_page(inode->i_mapping, newsize,
1272                                           udf_get_block);
1273                 if (err)
1274                         return err;
1275                 truncate_setsize(inode, newsize);
1276                 down_write(&iinfo->i_data_sem);
1277                 udf_clear_extent_cache(inode);
1278                 err = udf_truncate_extents(inode);
1279                 up_write(&iinfo->i_data_sem);
1280                 if (err)
1281                         return err;
1282         }
1283 update_time:
1284         inode->i_mtime = inode->i_ctime = current_time(inode);
1285         if (IS_SYNC(inode))
1286                 udf_sync_inode(inode);
1287         else
1288                 mark_inode_dirty(inode);
1289         return 0;
1290 }
1291
1292 /*
1293  * Maximum length of linked list formed by ICB hierarchy. The chosen number is
1294  * arbitrary - just that we hopefully don't limit any real use of rewritten
1295  * inode on write-once media but avoid looping for too long on corrupted media.
1296  */
1297 #define UDF_MAX_ICB_NESTING 1024
1298
1299 static int udf_read_inode(struct inode *inode, bool hidden_inode)
1300 {
1301         struct buffer_head *bh = NULL;
1302         struct fileEntry *fe;
1303         struct extendedFileEntry *efe;
1304         uint16_t ident;
1305         struct udf_inode_info *iinfo = UDF_I(inode);
1306         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1307         struct kernel_lb_addr *iloc = &iinfo->i_location;
1308         unsigned int link_count;
1309         unsigned int indirections = 0;
1310         int bs = inode->i_sb->s_blocksize;
1311         int ret = -EIO;
1312         uint32_t uid, gid;
1313
1314 reread:
1315         if (iloc->partitionReferenceNum >= sbi->s_partitions) {
1316                 udf_debug("partition reference: %u > logical volume partitions: %u\n",
1317                           iloc->partitionReferenceNum, sbi->s_partitions);
1318                 return -EIO;
1319         }
1320
1321         if (iloc->logicalBlockNum >=
1322             sbi->s_partmaps[iloc->partitionReferenceNum].s_partition_len) {
1323                 udf_debug("block=%u, partition=%u out of range\n",
1324                           iloc->logicalBlockNum, iloc->partitionReferenceNum);
1325                 return -EIO;
1326         }
1327
1328         /*
1329          * Set defaults, but the inode is still incomplete!
1330          * Note: get_new_inode() sets the following on a new inode:
1331          *      i_sb = sb
1332          *      i_no = ino
1333          *      i_flags = sb->s_flags
1334          *      i_state = 0
1335          * clean_inode(): zero fills and sets
1336          *      i_count = 1
1337          *      i_nlink = 1
1338          *      i_op = NULL;
1339          */
1340         bh = udf_read_ptagged(inode->i_sb, iloc, 0, &ident);
1341         if (!bh) {
1342                 udf_err(inode->i_sb, "(ino %lu) failed !bh\n", inode->i_ino);
1343                 return -EIO;
1344         }
1345
1346         if (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE &&
1347             ident != TAG_IDENT_USE) {
1348                 udf_err(inode->i_sb, "(ino %lu) failed ident=%u\n",
1349                         inode->i_ino, ident);
1350                 goto out;
1351         }
1352
1353         fe = (struct fileEntry *)bh->b_data;
1354         efe = (struct extendedFileEntry *)bh->b_data;
1355
1356         if (fe->icbTag.strategyType == cpu_to_le16(4096)) {
1357                 struct buffer_head *ibh;
1358
1359                 ibh = udf_read_ptagged(inode->i_sb, iloc, 1, &ident);
1360                 if (ident == TAG_IDENT_IE && ibh) {
1361                         struct kernel_lb_addr loc;
1362                         struct indirectEntry *ie;
1363
1364                         ie = (struct indirectEntry *)ibh->b_data;
1365                         loc = lelb_to_cpu(ie->indirectICB.extLocation);
1366
1367                         if (ie->indirectICB.extLength) {
1368                                 brelse(ibh);
1369                                 memcpy(&iinfo->i_location, &loc,
1370                                        sizeof(struct kernel_lb_addr));
1371                                 if (++indirections > UDF_MAX_ICB_NESTING) {
1372                                         udf_err(inode->i_sb,
1373                                                 "too many ICBs in ICB hierarchy"
1374                                                 " (max %d supported)\n",
1375                                                 UDF_MAX_ICB_NESTING);
1376                                         goto out;
1377                                 }
1378                                 brelse(bh);
1379                                 goto reread;
1380                         }
1381                 }
1382                 brelse(ibh);
1383         } else if (fe->icbTag.strategyType != cpu_to_le16(4)) {
1384                 udf_err(inode->i_sb, "unsupported strategy type: %u\n",
1385                         le16_to_cpu(fe->icbTag.strategyType));
1386                 goto out;
1387         }
1388         if (fe->icbTag.strategyType == cpu_to_le16(4))
1389                 iinfo->i_strat4096 = 0;
1390         else /* if (fe->icbTag.strategyType == cpu_to_le16(4096)) */
1391                 iinfo->i_strat4096 = 1;
1392
1393         iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
1394                                                         ICBTAG_FLAG_AD_MASK;
1395         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
1396             iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
1397             iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1398                 ret = -EIO;
1399                 goto out;
1400         }
1401         iinfo->i_unique = 0;
1402         iinfo->i_lenEAttr = 0;
1403         iinfo->i_lenExtents = 0;
1404         iinfo->i_lenAlloc = 0;
1405         iinfo->i_next_alloc_block = 0;
1406         iinfo->i_next_alloc_goal = 0;
1407         if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_EFE)) {
1408                 iinfo->i_efe = 1;
1409                 iinfo->i_use = 0;
1410                 ret = udf_alloc_i_data(inode, bs -
1411                                         sizeof(struct extendedFileEntry));
1412                 if (ret)
1413                         goto out;
1414                 memcpy(iinfo->i_ext.i_data,
1415                        bh->b_data + sizeof(struct extendedFileEntry),
1416                        bs - sizeof(struct extendedFileEntry));
1417         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_FE)) {
1418                 iinfo->i_efe = 0;
1419                 iinfo->i_use = 0;
1420                 ret = udf_alloc_i_data(inode, bs - sizeof(struct fileEntry));
1421                 if (ret)
1422                         goto out;
1423                 memcpy(iinfo->i_ext.i_data,
1424                        bh->b_data + sizeof(struct fileEntry),
1425                        bs - sizeof(struct fileEntry));
1426         } else if (fe->descTag.tagIdent == cpu_to_le16(TAG_IDENT_USE)) {
1427                 iinfo->i_efe = 0;
1428                 iinfo->i_use = 1;
1429                 iinfo->i_lenAlloc = le32_to_cpu(
1430                                 ((struct unallocSpaceEntry *)bh->b_data)->
1431                                  lengthAllocDescs);
1432                 ret = udf_alloc_i_data(inode, bs -
1433                                         sizeof(struct unallocSpaceEntry));
1434                 if (ret)
1435                         goto out;
1436                 memcpy(iinfo->i_ext.i_data,
1437                        bh->b_data + sizeof(struct unallocSpaceEntry),
1438                        bs - sizeof(struct unallocSpaceEntry));
1439                 return 0;
1440         }
1441
1442         ret = -EIO;
1443         read_lock(&sbi->s_cred_lock);
1444         uid = le32_to_cpu(fe->uid);
1445         if (uid == UDF_INVALID_ID ||
1446             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_SET))
1447                 inode->i_uid = sbi->s_uid;
1448         else
1449                 i_uid_write(inode, uid);
1450
1451         gid = le32_to_cpu(fe->gid);
1452         if (gid == UDF_INVALID_ID ||
1453             UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_SET))
1454                 inode->i_gid = sbi->s_gid;
1455         else
1456                 i_gid_write(inode, gid);
1457
1458         if (fe->icbTag.fileType != ICBTAG_FILE_TYPE_DIRECTORY &&
1459                         sbi->s_fmode != UDF_INVALID_MODE)
1460                 inode->i_mode = sbi->s_fmode;
1461         else if (fe->icbTag.fileType == ICBTAG_FILE_TYPE_DIRECTORY &&
1462                         sbi->s_dmode != UDF_INVALID_MODE)
1463                 inode->i_mode = sbi->s_dmode;
1464         else
1465                 inode->i_mode = udf_convert_permissions(fe);
1466         inode->i_mode &= ~sbi->s_umask;
1467         iinfo->i_extraPerms = le32_to_cpu(fe->permissions) & ~FE_MAPPED_PERMS;
1468
1469         read_unlock(&sbi->s_cred_lock);
1470
1471         link_count = le16_to_cpu(fe->fileLinkCount);
1472         if (!link_count) {
1473                 if (!hidden_inode) {
1474                         ret = -ESTALE;
1475                         goto out;
1476                 }
1477                 link_count = 1;
1478         }
1479         set_nlink(inode, link_count);
1480
1481         inode->i_size = le64_to_cpu(fe->informationLength);
1482         iinfo->i_lenExtents = inode->i_size;
1483
1484         if (iinfo->i_efe == 0) {
1485                 inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) <<
1486                         (inode->i_sb->s_blocksize_bits - 9);
1487
1488                 udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime);
1489                 udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime);
1490                 udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime);
1491
1492                 iinfo->i_unique = le64_to_cpu(fe->uniqueID);
1493                 iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr);
1494                 iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs);
1495                 iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint);
1496                 iinfo->i_streamdir = 0;
1497                 iinfo->i_lenStreams = 0;
1498         } else {
1499                 inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) <<
1500                     (inode->i_sb->s_blocksize_bits - 9);
1501
1502                 udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime);
1503                 udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime);
1504                 udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime);
1505                 udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime);
1506
1507                 iinfo->i_unique = le64_to_cpu(efe->uniqueID);
1508                 iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr);
1509                 iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs);
1510                 iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint);
1511
1512                 /* Named streams */
1513                 iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0);
1514                 iinfo->i_locStreamdir =
1515                         lelb_to_cpu(efe->streamDirectoryICB.extLocation);
1516                 iinfo->i_lenStreams = le64_to_cpu(efe->objectSize);
1517                 if (iinfo->i_lenStreams >= inode->i_size)
1518                         iinfo->i_lenStreams -= inode->i_size;
1519                 else
1520                         iinfo->i_lenStreams = 0;
1521         }
1522         inode->i_generation = iinfo->i_unique;
1523
1524         /*
1525          * Sanity check length of allocation descriptors and extended attrs to
1526          * avoid integer overflows
1527          */
1528         if (iinfo->i_lenEAttr > bs || iinfo->i_lenAlloc > bs)
1529                 goto out;
1530         /* Now do exact checks */
1531         if (udf_file_entry_alloc_offset(inode) + iinfo->i_lenAlloc > bs)
1532                 goto out;
1533         /* Sanity checks for files in ICB so that we don't get confused later */
1534         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1535                 /*
1536                  * For file in ICB data is stored in allocation descriptor
1537                  * so sizes should match
1538                  */
1539                 if (iinfo->i_lenAlloc != inode->i_size)
1540                         goto out;
1541                 /* File in ICB has to fit in there... */
1542                 if (inode->i_size > bs - udf_file_entry_alloc_offset(inode))
1543                         goto out;
1544         }
1545
1546         switch (fe->icbTag.fileType) {
1547         case ICBTAG_FILE_TYPE_DIRECTORY:
1548                 inode->i_op = &udf_dir_inode_operations;
1549                 inode->i_fop = &udf_dir_operations;
1550                 inode->i_mode |= S_IFDIR;
1551                 inc_nlink(inode);
1552                 break;
1553         case ICBTAG_FILE_TYPE_REALTIME:
1554         case ICBTAG_FILE_TYPE_REGULAR:
1555         case ICBTAG_FILE_TYPE_UNDEF:
1556         case ICBTAG_FILE_TYPE_VAT20:
1557                 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1558                         inode->i_data.a_ops = &udf_adinicb_aops;
1559                 else
1560                         inode->i_data.a_ops = &udf_aops;
1561                 inode->i_op = &udf_file_inode_operations;
1562                 inode->i_fop = &udf_file_operations;
1563                 inode->i_mode |= S_IFREG;
1564                 break;
1565         case ICBTAG_FILE_TYPE_BLOCK:
1566                 inode->i_mode |= S_IFBLK;
1567                 break;
1568         case ICBTAG_FILE_TYPE_CHAR:
1569                 inode->i_mode |= S_IFCHR;
1570                 break;
1571         case ICBTAG_FILE_TYPE_FIFO:
1572                 init_special_inode(inode, inode->i_mode | S_IFIFO, 0);
1573                 break;
1574         case ICBTAG_FILE_TYPE_SOCKET:
1575                 init_special_inode(inode, inode->i_mode | S_IFSOCK, 0);
1576                 break;
1577         case ICBTAG_FILE_TYPE_SYMLINK:
1578                 inode->i_data.a_ops = &udf_symlink_aops;
1579                 inode->i_op = &udf_symlink_inode_operations;
1580                 inode_nohighmem(inode);
1581                 inode->i_mode = S_IFLNK | 0777;
1582                 break;
1583         case ICBTAG_FILE_TYPE_MAIN:
1584                 udf_debug("METADATA FILE-----\n");
1585                 break;
1586         case ICBTAG_FILE_TYPE_MIRROR:
1587                 udf_debug("METADATA MIRROR FILE-----\n");
1588                 break;
1589         case ICBTAG_FILE_TYPE_BITMAP:
1590                 udf_debug("METADATA BITMAP FILE-----\n");
1591                 break;
1592         default:
1593                 udf_err(inode->i_sb, "(ino %lu) failed unknown file type=%u\n",
1594                         inode->i_ino, fe->icbTag.fileType);
1595                 goto out;
1596         }
1597         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1598                 struct deviceSpec *dsea =
1599                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1600                 if (dsea) {
1601                         init_special_inode(inode, inode->i_mode,
1602                                 MKDEV(le32_to_cpu(dsea->majorDeviceIdent),
1603                                       le32_to_cpu(dsea->minorDeviceIdent)));
1604                         /* Developer ID ??? */
1605                 } else
1606                         goto out;
1607         }
1608         ret = 0;
1609 out:
1610         brelse(bh);
1611         return ret;
1612 }
1613
1614 static int udf_alloc_i_data(struct inode *inode, size_t size)
1615 {
1616         struct udf_inode_info *iinfo = UDF_I(inode);
1617         iinfo->i_ext.i_data = kmalloc(size, GFP_KERNEL);
1618         if (!iinfo->i_ext.i_data)
1619                 return -ENOMEM;
1620         return 0;
1621 }
1622
1623 static umode_t udf_convert_permissions(struct fileEntry *fe)
1624 {
1625         umode_t mode;
1626         uint32_t permissions;
1627         uint32_t flags;
1628
1629         permissions = le32_to_cpu(fe->permissions);
1630         flags = le16_to_cpu(fe->icbTag.flags);
1631
1632         mode =  ((permissions) & 0007) |
1633                 ((permissions >> 2) & 0070) |
1634                 ((permissions >> 4) & 0700) |
1635                 ((flags & ICBTAG_FLAG_SETUID) ? S_ISUID : 0) |
1636                 ((flags & ICBTAG_FLAG_SETGID) ? S_ISGID : 0) |
1637                 ((flags & ICBTAG_FLAG_STICKY) ? S_ISVTX : 0);
1638
1639         return mode;
1640 }
1641
1642 void udf_update_extra_perms(struct inode *inode, umode_t mode)
1643 {
1644         struct udf_inode_info *iinfo = UDF_I(inode);
1645
1646         /*
1647          * UDF 2.01 sec. 3.3.3.3 Note 2:
1648          * In Unix, delete permission tracks write
1649          */
1650         iinfo->i_extraPerms &= ~FE_DELETE_PERMS;
1651         if (mode & 0200)
1652                 iinfo->i_extraPerms |= FE_PERM_U_DELETE;
1653         if (mode & 0020)
1654                 iinfo->i_extraPerms |= FE_PERM_G_DELETE;
1655         if (mode & 0002)
1656                 iinfo->i_extraPerms |= FE_PERM_O_DELETE;
1657 }
1658
1659 int udf_write_inode(struct inode *inode, struct writeback_control *wbc)
1660 {
1661         return udf_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
1662 }
1663
1664 static int udf_sync_inode(struct inode *inode)
1665 {
1666         return udf_update_inode(inode, 1);
1667 }
1668
1669 static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time)
1670 {
1671         if (iinfo->i_crtime.tv_sec > time.tv_sec ||
1672             (iinfo->i_crtime.tv_sec == time.tv_sec &&
1673              iinfo->i_crtime.tv_nsec > time.tv_nsec))
1674                 iinfo->i_crtime = time;
1675 }
1676
1677 static int udf_update_inode(struct inode *inode, int do_sync)
1678 {
1679         struct buffer_head *bh = NULL;
1680         struct fileEntry *fe;
1681         struct extendedFileEntry *efe;
1682         uint64_t lb_recorded;
1683         uint32_t udfperms;
1684         uint16_t icbflags;
1685         uint16_t crclen;
1686         int err = 0;
1687         struct udf_sb_info *sbi = UDF_SB(inode->i_sb);
1688         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
1689         struct udf_inode_info *iinfo = UDF_I(inode);
1690
1691         bh = udf_tgetblk(inode->i_sb,
1692                         udf_get_lb_pblock(inode->i_sb, &iinfo->i_location, 0));
1693         if (!bh) {
1694                 udf_debug("getblk failure\n");
1695                 return -EIO;
1696         }
1697
1698         lock_buffer(bh);
1699         memset(bh->b_data, 0, inode->i_sb->s_blocksize);
1700         fe = (struct fileEntry *)bh->b_data;
1701         efe = (struct extendedFileEntry *)bh->b_data;
1702
1703         if (iinfo->i_use) {
1704                 struct unallocSpaceEntry *use =
1705                         (struct unallocSpaceEntry *)bh->b_data;
1706
1707                 use->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1708                 memcpy(bh->b_data + sizeof(struct unallocSpaceEntry),
1709                        iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
1710                                         sizeof(struct unallocSpaceEntry));
1711                 use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
1712                 crclen = sizeof(struct unallocSpaceEntry);
1713
1714                 goto finish;
1715         }
1716
1717         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
1718                 fe->uid = cpu_to_le32(UDF_INVALID_ID);
1719         else
1720                 fe->uid = cpu_to_le32(i_uid_read(inode));
1721
1722         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_GID_FORGET))
1723                 fe->gid = cpu_to_le32(UDF_INVALID_ID);
1724         else
1725                 fe->gid = cpu_to_le32(i_gid_read(inode));
1726
1727         udfperms = ((inode->i_mode & 0007)) |
1728                    ((inode->i_mode & 0070) << 2) |
1729                    ((inode->i_mode & 0700) << 4);
1730
1731         udfperms |= iinfo->i_extraPerms;
1732         fe->permissions = cpu_to_le32(udfperms);
1733
1734         if (S_ISDIR(inode->i_mode) && inode->i_nlink > 0)
1735                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink - 1);
1736         else
1737                 fe->fileLinkCount = cpu_to_le16(inode->i_nlink);
1738
1739         fe->informationLength = cpu_to_le64(inode->i_size);
1740
1741         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1742                 struct regid *eid;
1743                 struct deviceSpec *dsea =
1744                         (struct deviceSpec *)udf_get_extendedattr(inode, 12, 1);
1745                 if (!dsea) {
1746                         dsea = (struct deviceSpec *)
1747                                 udf_add_extendedattr(inode,
1748                                                      sizeof(struct deviceSpec) +
1749                                                      sizeof(struct regid), 12, 0x3);
1750                         dsea->attrType = cpu_to_le32(12);
1751                         dsea->attrSubtype = 1;
1752                         dsea->attrLength = cpu_to_le32(
1753                                                 sizeof(struct deviceSpec) +
1754                                                 sizeof(struct regid));
1755                         dsea->impUseLength = cpu_to_le32(sizeof(struct regid));
1756                 }
1757                 eid = (struct regid *)dsea->impUse;
1758                 memset(eid, 0, sizeof(*eid));
1759                 strcpy(eid->ident, UDF_ID_DEVELOPER);
1760                 eid->identSuffix[0] = UDF_OS_CLASS_UNIX;
1761                 eid->identSuffix[1] = UDF_OS_ID_LINUX;
1762                 dsea->majorDeviceIdent = cpu_to_le32(imajor(inode));
1763                 dsea->minorDeviceIdent = cpu_to_le32(iminor(inode));
1764         }
1765
1766         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1767                 lb_recorded = 0; /* No extents => no blocks! */
1768         else
1769                 lb_recorded =
1770                         (inode->i_blocks + (1 << (blocksize_bits - 9)) - 1) >>
1771                         (blocksize_bits - 9);
1772
1773         if (iinfo->i_efe == 0) {
1774                 memcpy(bh->b_data + sizeof(struct fileEntry),
1775                        iinfo->i_ext.i_data,
1776                        inode->i_sb->s_blocksize - sizeof(struct fileEntry));
1777                 fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1778
1779                 udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime);
1780                 udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime);
1781                 udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime);
1782                 memset(&(fe->impIdent), 0, sizeof(struct regid));
1783                 strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER);
1784                 fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1785                 fe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1786                 fe->uniqueID = cpu_to_le64(iinfo->i_unique);
1787                 fe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1788                 fe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1789                 fe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1790                 fe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_FE);
1791                 crclen = sizeof(struct fileEntry);
1792         } else {
1793                 memcpy(bh->b_data + sizeof(struct extendedFileEntry),
1794                        iinfo->i_ext.i_data,
1795                        inode->i_sb->s_blocksize -
1796                                         sizeof(struct extendedFileEntry));
1797                 efe->objectSize =
1798                         cpu_to_le64(inode->i_size + iinfo->i_lenStreams);
1799                 efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
1800
1801                 if (iinfo->i_streamdir) {
1802                         struct long_ad *icb_lad = &efe->streamDirectoryICB;
1803
1804                         icb_lad->extLocation =
1805                                 cpu_to_lelb(iinfo->i_locStreamdir);
1806                         icb_lad->extLength =
1807                                 cpu_to_le32(inode->i_sb->s_blocksize);
1808                 }
1809
1810                 udf_adjust_time(iinfo, inode->i_atime);
1811                 udf_adjust_time(iinfo, inode->i_mtime);
1812                 udf_adjust_time(iinfo, inode->i_ctime);
1813
1814                 udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime);
1815                 udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime);
1816                 udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime);
1817                 udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime);
1818
1819                 memset(&(efe->impIdent), 0, sizeof(efe->impIdent));
1820                 strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER);
1821                 efe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1822                 efe->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1823                 efe->uniqueID = cpu_to_le64(iinfo->i_unique);
1824                 efe->lengthExtendedAttr = cpu_to_le32(iinfo->i_lenEAttr);
1825                 efe->lengthAllocDescs = cpu_to_le32(iinfo->i_lenAlloc);
1826                 efe->checkpoint = cpu_to_le32(iinfo->i_checkpoint);
1827                 efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
1828                 crclen = sizeof(struct extendedFileEntry);
1829         }
1830
1831 finish:
1832         if (iinfo->i_strat4096) {
1833                 fe->icbTag.strategyType = cpu_to_le16(4096);
1834                 fe->icbTag.strategyParameter = cpu_to_le16(1);
1835                 fe->icbTag.numEntries = cpu_to_le16(2);
1836         } else {
1837                 fe->icbTag.strategyType = cpu_to_le16(4);
1838                 fe->icbTag.numEntries = cpu_to_le16(1);
1839         }
1840
1841         if (iinfo->i_use)
1842                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
1843         else if (S_ISDIR(inode->i_mode))
1844                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
1845         else if (S_ISREG(inode->i_mode))
1846                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
1847         else if (S_ISLNK(inode->i_mode))
1848                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SYMLINK;
1849         else if (S_ISBLK(inode->i_mode))
1850                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_BLOCK;
1851         else if (S_ISCHR(inode->i_mode))
1852                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_CHAR;
1853         else if (S_ISFIFO(inode->i_mode))
1854                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_FIFO;
1855         else if (S_ISSOCK(inode->i_mode))
1856                 fe->icbTag.fileType = ICBTAG_FILE_TYPE_SOCKET;
1857
1858         icbflags =      iinfo->i_alloc_type |
1859                         ((inode->i_mode & S_ISUID) ? ICBTAG_FLAG_SETUID : 0) |
1860                         ((inode->i_mode & S_ISGID) ? ICBTAG_FLAG_SETGID : 0) |
1861                         ((inode->i_mode & S_ISVTX) ? ICBTAG_FLAG_STICKY : 0) |
1862                         (le16_to_cpu(fe->icbTag.flags) &
1863                                 ~(ICBTAG_FLAG_AD_MASK | ICBTAG_FLAG_SETUID |
1864                                 ICBTAG_FLAG_SETGID | ICBTAG_FLAG_STICKY));
1865
1866         fe->icbTag.flags = cpu_to_le16(icbflags);
1867         if (sbi->s_udfrev >= 0x0200)
1868                 fe->descTag.descVersion = cpu_to_le16(3);
1869         else
1870                 fe->descTag.descVersion = cpu_to_le16(2);
1871         fe->descTag.tagSerialNum = cpu_to_le16(sbi->s_serial_number);
1872         fe->descTag.tagLocation = cpu_to_le32(
1873                                         iinfo->i_location.logicalBlockNum);
1874         crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc - sizeof(struct tag);
1875         fe->descTag.descCRCLength = cpu_to_le16(crclen);
1876         fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(struct tag),
1877                                                   crclen));
1878         fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
1879
1880         set_buffer_uptodate(bh);
1881         unlock_buffer(bh);
1882
1883         /* write the data blocks */
1884         mark_buffer_dirty(bh);
1885         if (do_sync) {
1886                 sync_dirty_buffer(bh);
1887                 if (buffer_write_io_error(bh)) {
1888                         udf_warn(inode->i_sb, "IO error syncing udf inode [%08lx]\n",
1889                                  inode->i_ino);
1890                         err = -EIO;
1891                 }
1892         }
1893         brelse(bh);
1894
1895         return err;
1896 }
1897
1898 struct inode *__udf_iget(struct super_block *sb, struct kernel_lb_addr *ino,
1899                          bool hidden_inode)
1900 {
1901         unsigned long block = udf_get_lb_pblock(sb, ino, 0);
1902         struct inode *inode = iget_locked(sb, block);
1903         int err;
1904
1905         if (!inode)
1906                 return ERR_PTR(-ENOMEM);
1907
1908         if (!(inode->i_state & I_NEW))
1909                 return inode;
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_ext.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_ext.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 int8_t 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
2230         if (epos.bh)
2231                 get_bh(epos.bh);
2232
2233         while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
2234                 udf_write_aext(inode, &epos, &neloc, nelen, 1);
2235                 neloc = oeloc;
2236                 nelen = (etype << 30) | oelen;
2237         }
2238         udf_add_aext(inode, &epos, &neloc, nelen, 1);
2239         brelse(epos.bh);
2240
2241         return (nelen >> 30);
2242 }
2243
2244 int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
2245 {
2246         struct extent_position oepos;
2247         int adsize;
2248         int8_t etype;
2249         struct allocExtDesc *aed;
2250         struct udf_inode_info *iinfo;
2251         struct kernel_lb_addr eloc;
2252         uint32_t elen;
2253
2254         if (epos.bh) {
2255                 get_bh(epos.bh);
2256                 get_bh(epos.bh);
2257         }
2258
2259         iinfo = UDF_I(inode);
2260         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
2261                 adsize = sizeof(struct short_ad);
2262         else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
2263                 adsize = sizeof(struct long_ad);
2264         else
2265                 adsize = 0;
2266
2267         oepos = epos;
2268         if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
2269                 return -1;
2270
2271         while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
2272                 udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
2273                 if (oepos.bh != epos.bh) {
2274                         oepos.block = epos.block;
2275                         brelse(oepos.bh);
2276                         get_bh(epos.bh);
2277                         oepos.bh = epos.bh;
2278                         oepos.offset = epos.offset - adsize;
2279                 }
2280         }
2281         memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
2282         elen = 0;
2283
2284         if (epos.bh != oepos.bh) {
2285                 udf_free_blocks(inode->i_sb, inode, &epos.block, 0, 1);
2286                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2287                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2288                 if (!oepos.bh) {
2289                         iinfo->i_lenAlloc -= (adsize * 2);
2290                         mark_inode_dirty(inode);
2291                 } else {
2292                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2293                         le32_add_cpu(&aed->lengthAllocDescs, -(2 * adsize));
2294                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2295                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2296                                 udf_update_tag(oepos.bh->b_data,
2297                                                 oepos.offset - (2 * adsize));
2298                         else
2299                                 udf_update_tag(oepos.bh->b_data,
2300                                                 sizeof(struct allocExtDesc));
2301                         mark_buffer_dirty_inode(oepos.bh, inode);
2302                 }
2303         } else {
2304                 udf_write_aext(inode, &oepos, &eloc, elen, 1);
2305                 if (!oepos.bh) {
2306                         iinfo->i_lenAlloc -= adsize;
2307                         mark_inode_dirty(inode);
2308                 } else {
2309                         aed = (struct allocExtDesc *)oepos.bh->b_data;
2310                         le32_add_cpu(&aed->lengthAllocDescs, -adsize);
2311                         if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) ||
2312                             UDF_SB(inode->i_sb)->s_udfrev >= 0x0201)
2313                                 udf_update_tag(oepos.bh->b_data,
2314                                                 epos.offset - adsize);
2315                         else
2316                                 udf_update_tag(oepos.bh->b_data,
2317                                                 sizeof(struct allocExtDesc));
2318                         mark_buffer_dirty_inode(oepos.bh, inode);
2319                 }
2320         }
2321
2322         brelse(epos.bh);
2323         brelse(oepos.bh);
2324
2325         return (elen >> 30);
2326 }
2327
2328 int8_t inode_bmap(struct inode *inode, sector_t block,
2329                   struct extent_position *pos, struct kernel_lb_addr *eloc,
2330                   uint32_t *elen, sector_t *offset)
2331 {
2332         unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
2333         loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
2334         int8_t etype;
2335         struct udf_inode_info *iinfo;
2336
2337         iinfo = UDF_I(inode);
2338         if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
2339                 pos->offset = 0;
2340                 pos->block = iinfo->i_location;
2341                 pos->bh = NULL;
2342         }
2343         *elen = 0;
2344         do {
2345                 etype = udf_next_aext(inode, pos, eloc, elen, 1);
2346                 if (etype == -1) {
2347                         *offset = (bcount - lbcount) >> blocksize_bits;
2348                         iinfo->i_lenExtents = lbcount;
2349                         return -1;
2350                 }
2351                 lbcount += *elen;
2352         } while (lbcount <= bcount);
2353         /* update extent cache */
2354         udf_update_extent_cache(inode, lbcount - *elen, pos);
2355         *offset = (bcount + *elen - lbcount) >> blocksize_bits;
2356
2357         return etype;
2358 }
2359
2360 udf_pblk_t udf_block_map(struct inode *inode, sector_t block)
2361 {
2362         struct kernel_lb_addr eloc;
2363         uint32_t elen;
2364         sector_t offset;
2365         struct extent_position epos = {};
2366         udf_pblk_t ret;
2367
2368         down_read(&UDF_I(inode)->i_data_sem);
2369
2370         if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
2371                                                 (EXT_RECORDED_ALLOCATED >> 30))
2372                 ret = udf_get_lb_pblock(inode->i_sb, &eloc, offset);
2373         else
2374                 ret = 0;
2375
2376         up_read(&UDF_I(inode)->i_data_sem);
2377         brelse(epos.bh);
2378
2379         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))
2380                 return udf_fixed_to_variable(ret);
2381         else
2382                 return ret;
2383 }