fs/reiserfs/inode.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/time.h>
   7 #include <linux/fs.h>
   8 #include <linux/reiserfs_fs.h>
   9 #include <linux/reiserfs_acl.h>
  10 #include <linux/reiserfs_xattr.h>
  11 #include <linux/smp_lock.h>
  12 #include <linux/pagemap.h>
  13 #include <linux/highmem.h>
  14 #include <asm/uaccess.h>
  15 #include <asm/unaligned.h>
  16 #include <linux/buffer_head.h>
  17 #include <linux/mpage.h>
  18 #include <linux/writeback.h>
  19 #include <linux/quotaops.h>
  20 #include <linux/vs_dlimit.h>
  21 #include <linux/vserver/xid.h>
  22
  23 extern int reiserfs_default_io_size;    /* default io size devuned in super.c */
  24
  25 static int reiserfs_commit_write(struct file *f, struct page *page,
  26                                  unsigned from, unsigned to);
  27 static int reiserfs_prepare_write(struct file *f, struct page *page,
  28                                   unsigned from, unsigned to);
  29
  30 void reiserfs_delete_inode(struct inode *inode)
  31 {
  32         /* We need blocks for transaction + (user+group) quota update (possibly delete) */
  33         int jbegin_count =
  34             JOURNAL_PER_BALANCE_CNT * 2 +
  35             2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
  36         struct reiserfs_transaction_handle th;
  37         int err;
  38
  39         truncate_inode_pages(&inode->i_data, 0);
  40
  41         reiserfs_write_lock(inode->i_sb);
  42
  43         /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
  44         if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) {  /* also handles bad_inode case */
  45                 mutex_lock(&inode->i_mutex);
  46
  47                 reiserfs_delete_xattrs(inode);
  48
  49                 if (journal_begin(&th, inode->i_sb, jbegin_count)) {
  50                         mutex_unlock(&inode->i_mutex);
  51                         goto out;
  52                 }
  53                 reiserfs_update_inode_transaction(inode);
  54
  55                 err = reiserfs_delete_object(&th, inode);
  56
  57                 /* Do quota update inside a transaction for journaled quotas. We must do that
  58                  * after delete_object so that quota updates go into the same transaction as
  59                  * stat data deletion */
  60                 if (!err)
  61                         DQUOT_FREE_INODE(inode);
  62                 DLIMIT_FREE_INODE(inode);
  63
  64                 if (journal_end(&th, inode->i_sb, jbegin_count)) {
  65                         mutex_unlock(&inode->i_mutex);
  66                         goto out;
  67                 }
  68
  69                 mutex_unlock(&inode->i_mutex);
  70
  71                 /* check return value from reiserfs_delete_object after
  72                  * ending the transaction
  73                  */
  74                 if (err)
  75                     goto out;
  76
  77                 /* all items of file are deleted, so we can remove "save" link */
  78                 remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything
  79                                                                  * about an error here */
  80         } else {
  81                 /* no object items are in the tree */
  82                 ;
  83         }
  84       out:
  85         clear_inode(inode);     /* note this must go after the journal_end to prevent deadlock */
  86         inode->i_blocks = 0;
  87         reiserfs_write_unlock(inode->i_sb);
  88 }
  89
  90 static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
  91                           __u32 objectid, loff_t offset, int type, int length)
  92 {
  93         key->version = version;
  94
  95         key->on_disk_key.k_dir_id = dirid;
  96         key->on_disk_key.k_objectid = objectid;
  97         set_cpu_key_k_offset(key, offset);
  98         set_cpu_key_k_type(key, type);
  99         key->key_length = length;
 100 }
 101
 102 /* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
 103    offset and type of key */
 104 void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
 105                   int type, int length)
 106 {
 107         _make_cpu_key(key, get_inode_item_key_version(inode),
 108                       le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
 109                       le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
 110                       length);
 111 }
 112
 113 //
 114 // when key is 0, do not set version and short key
 115 //
 116 inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
 117                               int version,
 118                               loff_t offset, int type, int length,
 119                               int entry_count /*or ih_free_space */ )
 120 {
 121         if (key) {
 122                 ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
 123                 ih->ih_key.k_objectid =
 124                     cpu_to_le32(key->on_disk_key.k_objectid);
 125         }
 126         put_ih_version(ih, version);
 127         set_le_ih_k_offset(ih, offset);
 128         set_le_ih_k_type(ih, type);
 129         put_ih_item_len(ih, length);
 130         /*    set_ih_free_space (ih, 0); */
 131         // for directory items it is entry count, for directs and stat
 132         // datas - 0xffff, for indirects - 0
 133         put_ih_entry_count(ih, entry_count);
 134 }
 135
 136 //
 137 // FIXME: we might cache recently accessed indirect item
 138
 139 // Ugh.  Not too eager for that....
 140 //  I cut the code until such time as I see a convincing argument (benchmark).
 141 // I don't want a bloated inode struct..., and I don't like code complexity....
 142
 143 /* cutting the code is fine, since it really isn't in use yet and is easy
 144 ** to add back in.  But, Vladimir has a really good idea here.  Think
 145 ** about what happens for reading a file.  For each page,
 146 ** The VFS layer calls reiserfs_readpage, who searches the tree to find
 147 ** an indirect item.  This indirect item has X number of pointers, where
 148 ** X is a big number if we've done the block allocation right.  But,
 149 ** we only use one or two of these pointers during each call to readpage,
 150 ** needlessly researching again later on.
 151 **
 152 ** The size of the cache could be dynamic based on the size of the file.
 153 **
 154 ** I'd also like to see us cache the location the stat data item, since
 155 ** we are needlessly researching for that frequently.
 156 **
 157 ** --chris
 158 */
 159
 160 /* If this page has a file tail in it, and
 161 ** it was read in by get_block_create_0, the page data is valid,
 162 ** but tail is still sitting in a direct item, and we can't write to
 163 ** it.  So, look through this page, and check all the mapped buffers
 164 ** to make sure they have valid block numbers.  Any that don't need
 165 ** to be unmapped, so that block_prepare_write will correctly call
 166 ** reiserfs_get_block to convert the tail into an unformatted node
 167 */
 168 static inline void fix_tail_page_for_writing(struct page *page)
 169 {
 170         struct buffer_head *head, *next, *bh;
 171
 172         if (page && page_has_buffers(page)) {
 173                 head = page_buffers(page);
 174                 bh = head;
 175                 do {
 176                         next = bh->b_this_page;
 177                         if (buffer_mapped(bh) && bh->b_blocknr == 0) {
 178                                 reiserfs_unmap_buffer(bh);
 179                         }
 180                         bh = next;
 181                 } while (bh != head);
 182         }
 183 }
 184
 185 /* reiserfs_get_block does not need to allocate a block only if it has been
 186    done already or non-hole position has been found in the indirect item */
 187 static inline int allocation_needed(int retval, b_blocknr_t allocated,
 188                                     struct item_head *ih,
 189                                     __le32 * item, int pos_in_item)
 190 {
 191         if (allocated)
 192                 return 0;
 193         if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
 194             get_block_num(item, pos_in_item))
 195                 return 0;
 196         return 1;
 197 }
 198
 199 static inline int indirect_item_found(int retval, struct item_head *ih)
 200 {
 201         return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
 202 }
 203
 204 static inline void set_block_dev_mapped(struct buffer_head *bh,
 205                                         b_blocknr_t block, struct inode *inode)
 206 {
 207         map_bh(bh, inode->i_sb, block);
 208 }
 209
 210 //
 211 // files which were created in the earlier version can not be longer,
 212 // than 2 gb
 213 //
 214 static int file_capable(struct inode *inode, long block)
 215 {
 216         if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 ||      // it is new file.
 217             block < (1 << (31 - inode->i_sb->s_blocksize_bits)))        // old file, but 'block' is inside of 2gb
 218                 return 1;
 219
 220         return 0;
 221 }
 222
 223 /*static*/ int restart_transaction(struct reiserfs_transaction_handle *th,
 224                                    struct inode *inode, struct path *path)
 225 {
 226         struct super_block *s = th->t_super;
 227         int len = th->t_blocks_allocated;
 228         int err;
 229
 230         BUG_ON(!th->t_trans_id);
 231         BUG_ON(!th->t_refcount);
 232
 233         /* we cannot restart while nested */
 234         if (th->t_refcount > 1) {
 235                 return 0;
 236         }
 237         pathrelse(path);
 238         reiserfs_update_sd(th, inode);
 239         err = journal_end(th, s, len);
 240         if (!err) {
 241                 err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
 242                 if (!err)
 243                         reiserfs_update_inode_transaction(inode);
 244         }
 245         return err;
 246 }
 247
 248 // it is called by get_block when create == 0. Returns block number
 249 // for 'block'-th logical block of file. When it hits direct item it
 250 // returns 0 (being called from bmap) or read direct item into piece
 251 // of page (bh_result)
 252
 253 // Please improve the english/clarity in the comment above, as it is
 254 // hard to understand.
 255
 256 static int _get_block_create_0(struct inode *inode, long block,
 257                                struct buffer_head *bh_result, int args)
 258 {
 259         INITIALIZE_PATH(path);
 260         struct cpu_key key;
 261         struct buffer_head *bh;
 262         struct item_head *ih, tmp_ih;
 263         int fs_gen;
 264         int blocknr;
 265         char *p = NULL;
 266         int chars;
 267         int ret;
 268         int result;
 269         int done = 0;
 270         unsigned long offset;
 271
 272         // prepare the key to look for the 'block'-th block of file
 273         make_cpu_key(&key, inode,
 274                      (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
 275                      3);
 276
 277       research:
 278         result = search_for_position_by_key(inode->i_sb, &key, &path);
 279         if (result != POSITION_FOUND) {
 280                 pathrelse(&path);
 281                 if (p)
 282                         kunmap(bh_result->b_page);
 283                 if (result == IO_ERROR)
 284                         return -EIO;
 285                 // We do not return -ENOENT if there is a hole but page is uptodate, because it means
 286                 // That there is some MMAPED data associated with it that is yet to be written to disk.
 287                 if ((args & GET_BLOCK_NO_HOLE)
 288                     && !PageUptodate(bh_result->b_page)) {
 289                         return -ENOENT;
 290                 }
 291                 return 0;
 292         }
 293         //
 294         bh = get_last_bh(&path);
 295         ih = get_ih(&path);
 296         if (is_indirect_le_ih(ih)) {
 297                 __le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih);
 298
 299                 /* FIXME: here we could cache indirect item or part of it in
 300                    the inode to avoid search_by_key in case of subsequent
 301                    access to file */
 302                 blocknr = get_block_num(ind_item, path.pos_in_item);
 303                 ret = 0;
 304                 if (blocknr) {
 305                         map_bh(bh_result, inode->i_sb, blocknr);
 306                         if (path.pos_in_item ==
 307                             ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
 308                                 set_buffer_boundary(bh_result);
 309                         }
 310                 } else
 311                         // We do not return -ENOENT if there is a hole but page is uptodate, because it means
 312                         // That there is some MMAPED data associated with it that is yet to  be written to disk.
 313                 if ((args & GET_BLOCK_NO_HOLE)
 314                             && !PageUptodate(bh_result->b_page)) {
 315                         ret = -ENOENT;
 316                 }
 317
 318                 pathrelse(&path);
 319                 if (p)
 320                         kunmap(bh_result->b_page);
 321                 return ret;
 322         }
 323         // requested data are in direct item(s)
 324         if (!(args & GET_BLOCK_READ_DIRECT)) {
 325                 // we are called by bmap. FIXME: we can not map block of file
 326                 // when it is stored in direct item(s)
 327                 pathrelse(&path);
 328                 if (p)
 329                         kunmap(bh_result->b_page);
 330                 return -ENOENT;
 331         }
 332
 333         /* if we've got a direct item, and the buffer or page was uptodate,
 334          ** we don't want to pull data off disk again.  skip to the
 335          ** end, where we map the buffer and return
 336          */
 337         if (buffer_uptodate(bh_result)) {
 338                 goto finished;
 339         } else
 340                 /*
 341                  ** grab_tail_page can trigger calls to reiserfs_get_block on up to date
 342                  ** pages without any buffers.  If the page is up to date, we don't want
 343                  ** read old data off disk.  Set the up to date bit on the buffer instead
 344                  ** and jump to the end
 345                  */
 346         if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
 347                 set_buffer_uptodate(bh_result);
 348                 goto finished;
 349         }
 350         // read file tail into part of page
 351         offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
 352         fs_gen = get_generation(inode->i_sb);
 353         copy_item_head(&tmp_ih, ih);
 354
 355         /* we only want to kmap if we are reading the tail into the page.
 356          ** this is not the common case, so we don't kmap until we are
 357          ** sure we need to.  But, this means the item might move if
 358          ** kmap schedules
 359          */
 360         if (!p) {
 361                 p = (char *)kmap(bh_result->b_page);
 362                 if (fs_changed(fs_gen, inode->i_sb)
 363                     && item_moved(&tmp_ih, &path)) {
 364                         goto research;
 365                 }
 366         }
 367         p += offset;
 368         memset(p, 0, inode->i_sb->s_blocksize);
 369         do {
 370                 if (!is_direct_le_ih(ih)) {
 371                         BUG();
 372                 }
 373                 /* make sure we don't read more bytes than actually exist in
 374                  ** the file.  This can happen in odd cases where i_size isn't
 375                  ** correct, and when direct item padding results in a few
 376                  ** extra bytes at the end of the direct item
 377                  */
 378                 if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
 379                         break;
 380                 if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
 381                         chars =
 382                             inode->i_size - (le_ih_k_offset(ih) - 1) -
 383                             path.pos_in_item;
 384                         done = 1;
 385                 } else {
 386                         chars = ih_item_len(ih) - path.pos_in_item;
 387                 }
 388                 memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars);
 389
 390                 if (done)
 391                         break;
 392
 393                 p += chars;
 394
 395                 if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
 396                         // we done, if read direct item is not the last item of
 397                         // node FIXME: we could try to check right delimiting key
 398                         // to see whether direct item continues in the right
 399                         // neighbor or rely on i_size
 400                         break;
 401
 402                 // update key to look for the next piece
 403                 set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
 404                 result = search_for_position_by_key(inode->i_sb, &key, &path);
 405                 if (result != POSITION_FOUND)
 406                         // i/o error most likely
 407                         break;
 408                 bh = get_last_bh(&path);
 409                 ih = get_ih(&path);
 410         } while (1);
 411
 412         flush_dcache_page(bh_result->b_page);
 413         kunmap(bh_result->b_page);
 414
 415       finished:
 416         pathrelse(&path);
 417
 418         if (result == IO_ERROR)
 419                 return -EIO;
 420
 421         /* this buffer has valid data, but isn't valid for io.  mapping it to
 422          * block #0 tells the rest of reiserfs it just has a tail in it
 423          */
 424         map_bh(bh_result, inode->i_sb, 0);
 425         set_buffer_uptodate(bh_result);
 426         return 0;
 427 }
 428
 429 // this is called to create file map. So, _get_block_create_0 will not
 430 // read direct item
 431 static int reiserfs_bmap(struct inode *inode, sector_t block,
 432                          struct buffer_head *bh_result, int create)
 433 {
 434         if (!file_capable(inode, block))
 435                 return -EFBIG;
 436
 437         reiserfs_write_lock(inode->i_sb);
 438         /* do not read the direct item */
 439         _get_block_create_0(inode, block, bh_result, 0);
 440         reiserfs_write_unlock(inode->i_sb);
 441         return 0;
 442 }
 443
 444 /* special version of get_block that is only used by grab_tail_page right
 445 ** now.  It is sent to block_prepare_write, and when you try to get a
 446 ** block past the end of the file (or a block from a hole) it returns
 447 ** -ENOENT instead of a valid buffer.  block_prepare_write expects to
 448 ** be able to do i/o on the buffers returned, unless an error value
 449 ** is also returned.
 450 **
 451 ** So, this allows block_prepare_write to be used for reading a single block
 452 ** in a page.  Where it does not produce a valid page for holes, or past the
 453 ** end of the file.  This turns out to be exactly what we need for reading
 454 ** tails for conversion.
 455 **
 456 ** The point of the wrapper is forcing a certain value for create, even
 457 ** though the VFS layer is calling this function with create==1.  If you
 458 ** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
 459 ** don't use this function.
 460 */
 461 static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
 462                                        struct buffer_head *bh_result,
 463                                        int create)
 464 {
 465         return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
 466 }
 467
 468 /* This is special helper for reiserfs_get_block in case we are executing
 469    direct_IO request. */
 470 static int reiserfs_get_blocks_direct_io(struct inode *inode,
 471                                          sector_t iblock,
 472                                          unsigned long max_blocks,
 473                                          struct buffer_head *bh_result,
 474                                          int create)
 475 {
 476         int ret;
 477
 478         bh_result->b_page = NULL;
 479
 480         /* We set the b_size before reiserfs_get_block call since it is
 481            referenced in convert_tail_for_hole() that may be called from
 482            reiserfs_get_block() */
 483         bh_result->b_size = (1 << inode->i_blkbits);
 484
 485         ret = reiserfs_get_block(inode, iblock, bh_result,
 486                                  create | GET_BLOCK_NO_DANGLE);
 487         if (ret)
 488                 goto out;
 489
 490         /* don't allow direct io onto tail pages */
 491         if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
 492                 /* make sure future calls to the direct io funcs for this offset
 493                  ** in the file fail by unmapping the buffer
 494                  */
 495                 clear_buffer_mapped(bh_result);
 496                 ret = -EINVAL;
 497         }
 498         /* Possible unpacked tail. Flush the data before pages have
 499            disappeared */
 500         if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
 501                 int err;
 502                 lock_kernel();
 503                 err = reiserfs_commit_for_inode(inode);
 504                 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
 505                 unlock_kernel();
 506                 if (err < 0)
 507                         ret = err;
 508         }
 509       out:
 510         return ret;
 511 }
 512
 513 /*
 514 ** helper function for when reiserfs_get_block is called for a hole
 515 ** but the file tail is still in a direct item
 516 ** bh_result is the buffer head for the hole
 517 ** tail_offset is the offset of the start of the tail in the file
 518 **
 519 ** This calls prepare_write, which will start a new transaction
 520 ** you should not be in a transaction, or have any paths held when you
 521 ** call this.
 522 */
 523 static int convert_tail_for_hole(struct inode *inode,
 524                                  struct buffer_head *bh_result,
 525                                  loff_t tail_offset)
 526 {
 527         unsigned long index;
 528         unsigned long tail_end;
 529         unsigned long tail_start;
 530         struct page *tail_page;
 531         struct page *hole_page = bh_result->b_page;
 532         int retval = 0;
 533
 534         if ((tail_offset & (bh_result->b_size - 1)) != 1)
 535                 return -EIO;
 536
 537         /* always try to read until the end of the block */
 538         tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
 539         tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
 540
 541         index = tail_offset >> PAGE_CACHE_SHIFT;
 542         /* hole_page can be zero in case of direct_io, we are sure
 543            that we cannot get here if we write with O_DIRECT into
 544            tail page */
 545         if (!hole_page || index != hole_page->index) {
 546                 tail_page = grab_cache_page(inode->i_mapping, index);
 547                 retval = -ENOMEM;
 548                 if (!tail_page) {
 549                         goto out;
 550                 }
 551         } else {
 552                 tail_page = hole_page;
 553         }
 554
 555         /* we don't have to make sure the conversion did not happen while
 556          ** we were locking the page because anyone that could convert
 557          ** must first take i_mutex.
 558          **
 559          ** We must fix the tail page for writing because it might have buffers
 560          ** that are mapped, but have a block number of 0.  This indicates tail
 561          ** data that has been read directly into the page, and block_prepare_write
 562          ** won't trigger a get_block in this case.
 563          */
 564         fix_tail_page_for_writing(tail_page);
 565         retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end);
 566         if (retval)
 567                 goto unlock;
 568
 569         /* tail conversion might change the data in the page */
 570         flush_dcache_page(tail_page);
 571
 572         retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
 573
 574       unlock:
 575         if (tail_page != hole_page) {
 576                 unlock_page(tail_page);
 577                 page_cache_release(tail_page);
 578         }
 579       out:
 580         return retval;
 581 }
 582
 583 static inline int _allocate_block(struct reiserfs_transaction_handle *th,
 584                                   long block,
 585                                   struct inode *inode,
 586                                   b_blocknr_t * allocated_block_nr,
 587                                   struct path *path, int flags)
 588 {
 589         BUG_ON(!th->t_trans_id);
 590
 591 #ifdef REISERFS_PREALLOCATE
 592         if (!(flags & GET_BLOCK_NO_IMUX)) {
 593                 return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
 594                                                   path, block);
 595         }
 596 #endif
 597         return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
 598                                          block);
 599 }
 600
 601 int reiserfs_get_block(struct inode *inode, sector_t block,
 602                        struct buffer_head *bh_result, int create)
 603 {
 604         int repeat, retval = 0;
 605         b_blocknr_t allocated_block_nr = 0;     // b_blocknr_t is (unsigned) 32 bit int
 606         INITIALIZE_PATH(path);
 607         int pos_in_item;
 608         struct cpu_key key;
 609         struct buffer_head *bh, *unbh = NULL;
 610         struct item_head *ih, tmp_ih;
 611         __le32 *item;
 612         int done;
 613         int fs_gen;
 614         struct reiserfs_transaction_handle *th = NULL;
 615         /* space reserved in transaction batch:
 616            . 3 balancings in direct->indirect conversion
 617            . 1 block involved into reiserfs_update_sd()
 618            XXX in practically impossible worst case direct2indirect()
 619            can incur (much) more than 3 balancings.
 620            quota update for user, group */
 621         int jbegin_count =
 622             JOURNAL_PER_BALANCE_CNT * 3 + 1 +
 623             2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
 624         int version;
 625         int dangle = 1;
 626         loff_t new_offset =
 627             (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
 628
 629         /* bad.... */
 630         reiserfs_write_lock(inode->i_sb);
 631         version = get_inode_item_key_version(inode);
 632
 633         if (!file_capable(inode, block)) {
 634                 reiserfs_write_unlock(inode->i_sb);
 635                 return -EFBIG;
 636         }
 637
 638         /* if !create, we aren't changing the FS, so we don't need to
 639          ** log anything, so we don't need to start a transaction
 640          */
 641         if (!(create & GET_BLOCK_CREATE)) {
 642                 int ret;
 643                 /* find number of block-th logical block of the file */
 644                 ret = _get_block_create_0(inode, block, bh_result,
 645                                           create | GET_BLOCK_READ_DIRECT);
 646                 reiserfs_write_unlock(inode->i_sb);
 647                 return ret;
 648         }
 649         /*
 650          * if we're already in a transaction, make sure to close
 651          * any new transactions we start in this func
 652          */
 653         if ((create & GET_BLOCK_NO_DANGLE) ||
 654             reiserfs_transaction_running(inode->i_sb))
 655                 dangle = 0;
 656
 657         /* If file is of such a size, that it might have a tail and tails are enabled
 658          ** we should mark it as possibly needing tail packing on close
 659          */
 660         if ((have_large_tails(inode->i_sb)
 661              && inode->i_size < i_block_size(inode) * 4)
 662             || (have_small_tails(inode->i_sb)
 663                 && inode->i_size < i_block_size(inode)))
 664                 REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
 665
 666         /* set the key of the first byte in the 'block'-th block of file */
 667         make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
 668         if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
 669               start_trans:
 670                 th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
 671                 if (!th) {
 672                         retval = -ENOMEM;
 673                         goto failure;
 674                 }
 675                 reiserfs_update_inode_transaction(inode);
 676         }
 677       research:
 678
 679         retval = search_for_position_by_key(inode->i_sb, &key, &path);
 680         if (retval == IO_ERROR) {
 681                 retval = -EIO;
 682                 goto failure;
 683         }
 684
 685         bh = get_last_bh(&path);
 686         ih = get_ih(&path);
 687         item = get_item(&path);
 688         pos_in_item = path.pos_in_item;
 689
 690         fs_gen = get_generation(inode->i_sb);
 691         copy_item_head(&tmp_ih, ih);
 692
 693         if (allocation_needed
 694             (retval, allocated_block_nr, ih, item, pos_in_item)) {
 695                 /* we have to allocate block for the unformatted node */
 696                 if (!th) {
 697                         pathrelse(&path);
 698                         goto start_trans;
 699                 }
 700
 701                 repeat =
 702                     _allocate_block(th, block, inode, &allocated_block_nr,
 703                                     &path, create);
 704
 705                 if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
 706                         /* restart the transaction to give the journal a chance to free
 707                          ** some blocks.  releases the path, so we have to go back to
 708                          ** research if we succeed on the second try
 709                          */
 710                         SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
 711                         retval = restart_transaction(th, inode, &path);
 712                         if (retval)
 713                                 goto failure;
 714                         repeat =
 715                             _allocate_block(th, block, inode,
 716                                             &allocated_block_nr, NULL, create);
 717
 718                         if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
 719                                 goto research;
 720                         }
 721                         if (repeat == QUOTA_EXCEEDED)
 722                                 retval = -EDQUOT;
 723                         else
 724                                 retval = -ENOSPC;
 725                         goto failure;
 726                 }
 727
 728                 if (fs_changed(fs_gen, inode->i_sb)
 729                     && item_moved(&tmp_ih, &path)) {
 730                         goto research;
 731                 }
 732         }
 733
 734         if (indirect_item_found(retval, ih)) {
 735                 b_blocknr_t unfm_ptr;
 736                 /* 'block'-th block is in the file already (there is
 737                    corresponding cell in some indirect item). But it may be
 738                    zero unformatted node pointer (hole) */
 739                 unfm_ptr = get_block_num(item, pos_in_item);
 740                 if (unfm_ptr == 0) {
 741                         /* use allocated block to plug the hole */
 742                         reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
 743                         if (fs_changed(fs_gen, inode->i_sb)
 744                             && item_moved(&tmp_ih, &path)) {
 745                                 reiserfs_restore_prepared_buffer(inode->i_sb,
 746                                                                  bh);
 747                                 goto research;
 748                         }
 749                         set_buffer_new(bh_result);
 750                         if (buffer_dirty(bh_result)
 751                             && reiserfs_data_ordered(inode->i_sb))
 752                                 reiserfs_add_ordered_list(inode, bh_result);
 753                         put_block_num(item, pos_in_item, allocated_block_nr);
 754                         unfm_ptr = allocated_block_nr;
 755                         journal_mark_dirty(th, inode->i_sb, bh);
 756                         reiserfs_update_sd(th, inode);
 757                 }
 758                 set_block_dev_mapped(bh_result, unfm_ptr, inode);
 759                 pathrelse(&path);
 760                 retval = 0;
 761                 if (!dangle && th)
 762                         retval = reiserfs_end_persistent_transaction(th);
 763
 764                 reiserfs_write_unlock(inode->i_sb);
 765
 766                 /* the item was found, so new blocks were not added to the file
 767                  ** there is no need to make sure the inode is updated with this
 768                  ** transaction
 769                  */
 770                 return retval;
 771         }
 772
 773         if (!th) {
 774                 pathrelse(&path);
 775                 goto start_trans;
 776         }
 777
 778         /* desired position is not found or is in the direct item. We have
 779            to append file with holes up to 'block'-th block converting
 780            direct items to indirect one if necessary */
 781         done = 0;
 782         do {
 783                 if (is_statdata_le_ih(ih)) {
 784                         __le32 unp = 0;
 785                         struct cpu_key tmp_key;
 786
 787                         /* indirect item has to be inserted */
 788                         make_le_item_head(&tmp_ih, &key, version, 1,
 789                                           TYPE_INDIRECT, UNFM_P_SIZE,
 790                                           0 /* free_space */ );
 791
 792                         if (cpu_key_k_offset(&key) == 1) {
 793                                 /* we are going to add 'block'-th block to the file. Use
 794                                    allocated block for that */
 795                                 unp = cpu_to_le32(allocated_block_nr);
 796                                 set_block_dev_mapped(bh_result,
 797                                                      allocated_block_nr, inode);
 798                                 set_buffer_new(bh_result);
 799                                 done = 1;
 800                         }
 801                         tmp_key = key;  // ;)
 802                         set_cpu_key_k_offset(&tmp_key, 1);
 803                         PATH_LAST_POSITION(&path)++;
 804
 805                         retval =
 806                             reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
 807                                                  inode, (char *)&unp);
 808                         if (retval) {
 809                                 reiserfs_free_block(th, inode,
 810                                                     allocated_block_nr, 1);
 811                                 goto failure;   // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
 812                         }
 813                         //mark_tail_converted (inode);
 814                 } else if (is_direct_le_ih(ih)) {
 815                         /* direct item has to be converted */
 816                         loff_t tail_offset;
 817
 818                         tail_offset =
 819                             ((le_ih_k_offset(ih) -
 820                               1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
 821                         if (tail_offset == cpu_key_k_offset(&key)) {
 822                                 /* direct item we just found fits into block we have
 823                                    to map. Convert it into unformatted node: use
 824                                    bh_result for the conversion */
 825                                 set_block_dev_mapped(bh_result,
 826                                                      allocated_block_nr, inode);
 827                                 unbh = bh_result;
 828                                 done = 1;
 829                         } else {
 830                                 /* we have to padd file tail stored in direct item(s)
 831                                    up to block size and convert it to unformatted
 832                                    node. FIXME: this should also get into page cache */
 833
 834                                 pathrelse(&path);
 835                                 /*
 836                                  * ugly, but we can only end the transaction if
 837                                  * we aren't nested
 838                                  */
 839                                 BUG_ON(!th->t_refcount);
 840                                 if (th->t_refcount == 1) {
 841                                         retval =
 842                                             reiserfs_end_persistent_transaction
 843                                             (th);
 844                                         th = NULL;
 845                                         if (retval)
 846                                                 goto failure;
 847                                 }
 848
 849                                 retval =
 850                                     convert_tail_for_hole(inode, bh_result,
 851                                                           tail_offset);
 852                                 if (retval) {
 853                                         if (retval != -ENOSPC)
 854                                                 reiserfs_warning(inode->i_sb,
 855                                                                  "clm-6004: convert tail failed inode %lu, error %d",
 856                                                                  inode->i_ino,
 857                                                                  retval);
 858                                         if (allocated_block_nr) {
 859                                                 /* the bitmap, the super, and the stat data == 3 */
 860                                                 if (!th)
 861                                                         th = reiserfs_persistent_transaction(inode->i_sb, 3);
 862                                                 if (th)
 863                                                         reiserfs_free_block(th,
 864                                                                             inode,
 865                                                                             allocated_block_nr,
 866                                                                             1);
 867                                         }
 868                                         goto failure;
 869                                 }
 870                                 goto research;
 871                         }
 872                         retval =
 873                             direct2indirect(th, inode, &path, unbh,
 874                                             tail_offset);
 875                         if (retval) {
 876                                 reiserfs_unmap_buffer(unbh);
 877                                 reiserfs_free_block(th, inode,
 878                                                     allocated_block_nr, 1);
 879                                 goto failure;
 880                         }
 881                         /* it is important the set_buffer_uptodate is done after
 882                          ** the direct2indirect.  The buffer might contain valid
 883                          ** data newer than the data on disk (read by readpage, changed,
 884                          ** and then sent here by writepage).  direct2indirect needs
 885                          ** to know if unbh was already up to date, so it can decide
 886                          ** if the data in unbh needs to be replaced with data from
 887                          ** the disk
 888                          */
 889                         set_buffer_uptodate(unbh);
 890
 891                         /* unbh->b_page == NULL in case of DIRECT_IO request, this means
 892                            buffer will disappear shortly, so it should not be added to
 893                          */
 894                         if (unbh->b_page) {
 895                                 /* we've converted the tail, so we must
 896                                  ** flush unbh before the transaction commits
 897                                  */
 898                                 reiserfs_add_tail_list(inode, unbh);
 899
 900                                 /* mark it dirty now to prevent commit_write from adding
 901                                  ** this buffer to the inode's dirty buffer list
 902                                  */
 903                                 /*
 904                                  * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
 905                                  * It's still atomic, but it sets the page dirty too,
 906                                  * which makes it eligible for writeback at any time by the
 907                                  * VM (which was also the case with __mark_buffer_dirty())
 908                                  */
 909                                 mark_buffer_dirty(unbh);
 910                         }
 911                 } else {
 912                         /* append indirect item with holes if needed, when appending
 913                            pointer to 'block'-th block use block, which is already
 914                            allocated */
 915                         struct cpu_key tmp_key;
 916                         unp_t unf_single = 0;   // We use this in case we need to allocate only
 917                         // one block which is a fastpath
 918                         unp_t *un;
 919                         __u64 max_to_insert =
 920                             MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
 921                             UNFM_P_SIZE;
 922                         __u64 blocks_needed;
 923
 924                         RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
 925                                "vs-804: invalid position for append");
 926                         /* indirect item has to be appended, set up key of that position */
 927                         make_cpu_key(&tmp_key, inode,
 928                                      le_key_k_offset(version,
 929                                                      &(ih->ih_key)) +
 930                                      op_bytes_number(ih,
 931                                                      inode->i_sb->s_blocksize),
 932                                      //pos_in_item * inode->i_sb->s_blocksize,
 933                                      TYPE_INDIRECT, 3); // key type is unimportant
 934
 935                         RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
 936                                "green-805: invalid offset");
 937                         blocks_needed =
 938                             1 +
 939                             ((cpu_key_k_offset(&key) -
 940                               cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
 941                              s_blocksize_bits);
 942
 943                         if (blocks_needed == 1) {
 944                                 un = &unf_single;
 945                         } else {
 946                                 un = kmalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_ATOMIC);      // We need to avoid scheduling.
 947                                 if (!un) {
 948                                         un = &unf_single;
 949                                         blocks_needed = 1;
 950                                         max_to_insert = 0;
 951                                 } else
 952                                         memset(un, 0,
 953                                                UNFM_P_SIZE * min(blocks_needed,
 954                                                                  max_to_insert));
 955                         }
 956                         if (blocks_needed <= max_to_insert) {
 957                                 /* we are going to add target block to the file. Use allocated
 958                                    block for that */
 959                                 un[blocks_needed - 1] =
 960                                     cpu_to_le32(allocated_block_nr);
 961                                 set_block_dev_mapped(bh_result,
 962                                                      allocated_block_nr, inode);
 963                                 set_buffer_new(bh_result);
 964                                 done = 1;
 965                         } else {
 966                                 /* paste hole to the indirect item */
 967                                 /* If kmalloc failed, max_to_insert becomes zero and it means we
 968                                    only have space for one block */
 969                                 blocks_needed =
 970                                     max_to_insert ? max_to_insert : 1;
 971                         }
 972                         retval =
 973                             reiserfs_paste_into_item(th, &path, &tmp_key, inode,
 974                                                      (char *)un,
 975                                                      UNFM_P_SIZE *
 976                                                      blocks_needed);
 977
 978                         if (blocks_needed != 1)
 979                                 kfree(un);
 980
 981                         if (retval) {
 982                                 reiserfs_free_block(th, inode,
 983                                                     allocated_block_nr, 1);
 984                                 goto failure;
 985                         }
 986                         if (!done) {
 987                                 /* We need to mark new file size in case this function will be
 988                                    interrupted/aborted later on. And we may do this only for
 989                                    holes. */
 990                                 inode->i_size +=
 991                                     inode->i_sb->s_blocksize * blocks_needed;
 992                         }
 993                 }
 994
 995                 if (done == 1)
 996                         break;
 997
 998                 /* this loop could log more blocks than we had originally asked
 999                  ** for.  So, we have to allow the transaction to end if it is
1000                  ** too big or too full.  Update the inode so things are
1001                  ** consistent if we crash before the function returns
1002                  **
1003                  ** release the path so that anybody waiting on the path before
1004                  ** ending their transaction will be able to continue.
1005                  */
1006                 if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
1007                         retval = restart_transaction(th, inode, &path);
1008                         if (retval)
1009                                 goto failure;
1010                 }
1011                 /* inserting indirect pointers for a hole can take a
1012                  ** long time.  reschedule if needed
1013                  */
1014                 cond_resched();
1015
1016                 retval = search_for_position_by_key(inode->i_sb, &key, &path);
1017                 if (retval == IO_ERROR) {
1018                         retval = -EIO;
1019                         goto failure;
1020                 }
1021                 if (retval == POSITION_FOUND) {
1022                         reiserfs_warning(inode->i_sb,
1023                                          "vs-825: reiserfs_get_block: "
1024                                          "%K should not be found", &key);
1025                         retval = -EEXIST;
1026                         if (allocated_block_nr)
1027                                 reiserfs_free_block(th, inode,
1028                                                     allocated_block_nr, 1);
1029                         pathrelse(&path);
1030                         goto failure;
1031                 }
1032                 bh = get_last_bh(&path);
1033                 ih = get_ih(&path);
1034                 item = get_item(&path);
1035                 pos_in_item = path.pos_in_item;
1036         } while (1);
1037
1038         retval = 0;
1039
1040       failure:
1041         if (th && (!dangle || (retval && !th->t_trans_id))) {
1042                 int err;
1043                 if (th->t_trans_id)
1044                         reiserfs_update_sd(th, inode);
1045                 err = reiserfs_end_persistent_transaction(th);
1046                 if (err)
1047                         retval = err;
1048         }
1049
1050         reiserfs_write_unlock(inode->i_sb);
1051         reiserfs_check_path(&path);
1052         return retval;
1053 }
1054
1055 static int
1056 reiserfs_readpages(struct file *file, struct address_space *mapping,
1057                    struct list_head *pages, unsigned nr_pages)
1058 {
1059         return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
1060 }
1061
1062 /* Compute real number of used bytes by file
1063  * Following three functions can go away when we'll have enough space in stat item
1064  */
1065 static int real_space_diff(struct inode *inode, int sd_size)
1066 {
1067         int bytes;
1068         loff_t blocksize = inode->i_sb->s_blocksize;
1069
1070         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
1071                 return sd_size;
1072
1073         /* End of file is also in full block with indirect reference, so round
1074          ** up to the next block.
1075          **
1076          ** there is just no way to know if the tail is actually packed
1077          ** on the file, so we have to assume it isn't.  When we pack the
1078          ** tail, we add 4 bytes to pretend there really is an unformatted
1079          ** node pointer
1080          */
1081         bytes =
1082             ((inode->i_size +
1083               (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
1084             sd_size;
1085         return bytes;
1086 }
1087
1088 static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
1089                                         int sd_size)
1090 {
1091         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1092                 return inode->i_size +
1093                     (loff_t) (real_space_diff(inode, sd_size));
1094         }
1095         return ((loff_t) real_space_diff(inode, sd_size)) +
1096             (((loff_t) blocks) << 9);
1097 }
1098
1099 /* Compute number of blocks used by file in ReiserFS counting */
1100 static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
1101 {
1102         loff_t bytes = inode_get_bytes(inode);
1103         loff_t real_space = real_space_diff(inode, sd_size);
1104
1105         /* keeps fsck and non-quota versions of reiserfs happy */
1106         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1107                 bytes += (loff_t) 511;
1108         }
1109
1110         /* files from before the quota patch might i_blocks such that
1111          ** bytes < real_space.  Deal with that here to prevent it from
1112          ** going negative.
1113          */
1114         if (bytes < real_space)
1115                 return 0;
1116         return (bytes - real_space) >> 9;
1117 }
1118
1119 //
1120 // BAD: new directories have stat data of new type and all other items
1121 // of old type. Version stored in the inode says about body items, so
1122 // in update_stat_data we can not rely on inode, but have to check
1123 // item version directly
1124 //
1125
1126 // called by read_locked_inode
1127 static void init_inode(struct inode *inode, struct path *path)
1128 {
1129         struct buffer_head *bh;
1130         struct item_head *ih;
1131         __u32 rdev;
1132         uid_t uid;
1133         gid_t gid;
1134         //int version = ITEM_VERSION_1;
1135
1136         bh = PATH_PLAST_BUFFER(path);
1137         ih = PATH_PITEM_HEAD(path);
1138
1139         copy_key(INODE_PKEY(inode), &(ih->ih_key));
1140         inode->i_blksize = reiserfs_default_io_size;
1141
1142         INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1143         REISERFS_I(inode)->i_flags = 0;
1144         REISERFS_I(inode)->i_prealloc_block = 0;
1145         REISERFS_I(inode)->i_prealloc_count = 0;
1146         REISERFS_I(inode)->i_trans_id = 0;
1147         REISERFS_I(inode)->i_jl = NULL;
1148         REISERFS_I(inode)->i_acl_access = NULL;
1149         REISERFS_I(inode)->i_acl_default = NULL;
1150         init_rwsem(&REISERFS_I(inode)->xattr_sem);
1151
1152         if (stat_data_v1(ih)) {
1153                 struct stat_data_v1 *sd =
1154                     (struct stat_data_v1 *)B_I_PITEM(bh, ih);
1155                 unsigned long blocks;
1156
1157                 uid = sd_v1_uid(sd);
1158                 gid = sd_v1_gid(sd);
1159
1160                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1161                 set_inode_sd_version(inode, STAT_DATA_V1);
1162                 inode->i_mode = sd_v1_mode(sd);
1163                 inode->i_nlink = sd_v1_nlink(sd);
1164                 inode->i_size = sd_v1_size(sd);
1165                 inode->i_atime.tv_sec = sd_v1_atime(sd);
1166                 inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1167                 inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1168                 inode->i_atime.tv_nsec = 0;
1169                 inode->i_ctime.tv_nsec = 0;
1170                 inode->i_mtime.tv_nsec = 0;
1171
1172                 inode->i_blocks = sd_v1_blocks(sd);
1173                 inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1174                 blocks = (inode->i_size + 511) >> 9;
1175                 blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1176                 if (inode->i_blocks > blocks) {
1177                         // there was a bug in <=3.5.23 when i_blocks could take negative
1178                         // values. Starting from 3.5.17 this value could even be stored in
1179                         // stat data. For such files we set i_blocks based on file
1180                         // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
1181                         // only updated if file's inode will ever change
1182                         inode->i_blocks = blocks;
1183                 }
1184
1185                 rdev = sd_v1_rdev(sd);
1186                 REISERFS_I(inode)->i_first_direct_byte =
1187                     sd_v1_first_direct_byte(sd);
1188                 /* an early bug in the quota code can give us an odd number for the
1189                  ** block count.  This is incorrect, fix it here.
1190                  */
1191                 if (inode->i_blocks & 1) {
1192                         inode->i_blocks++;
1193                 }
1194                 inode_set_bytes(inode,
1195                                 to_real_used_space(inode, inode->i_blocks,
1196                                                    SD_V1_SIZE));
1197                 /* nopack is initially zero for v1 objects. For v2 objects,
1198                    nopack is initialised from sd_attrs */
1199                 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1200         } else {
1201                 // new stat data found, but object may have old items
1202                 // (directories and symlinks)
1203                 struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);
1204
1205                 uid    = sd_v2_uid(sd);
1206                 gid    = sd_v2_gid(sd);
1207
1208                 inode->i_mode = sd_v2_mode(sd);
1209                 inode->i_nlink = sd_v2_nlink(sd);
1210                 inode->i_size = sd_v2_size(sd);
1211                 inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1212                 inode->i_atime.tv_sec = sd_v2_atime(sd);
1213                 inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1214                 inode->i_ctime.tv_nsec = 0;
1215                 inode->i_mtime.tv_nsec = 0;
1216                 inode->i_atime.tv_nsec = 0;
1217                 inode->i_blocks = sd_v2_blocks(sd);
1218                 rdev = sd_v2_rdev(sd);
1219                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1220                         inode->i_generation =
1221                             le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1222                 else
1223                         inode->i_generation = sd_v2_generation(sd);
1224
1225                 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1226                         set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1227                 else
1228                         set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1229                 REISERFS_I(inode)->i_first_direct_byte = 0;
1230                 set_inode_sd_version(inode, STAT_DATA_V2);
1231                 inode_set_bytes(inode,
1232                                 to_real_used_space(inode, inode->i_blocks,
1233                                                    SD_V2_SIZE));
1234                 /* read persistent inode attributes from sd and initalise
1235                    generic inode flags from them */
1236                 REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1237                 sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
1238         }
1239
1240         inode->i_uid = INOXID_UID(XID_TAG(inode), uid, gid);
1241         inode->i_gid = INOXID_GID(XID_TAG(inode), uid, gid);
1242         inode->i_xid = INOXID_XID(XID_TAG(inode), uid, gid, 0);
1243
1244         pathrelse(path);
1245         if (S_ISREG(inode->i_mode)) {
1246                 inode->i_op = &reiserfs_file_inode_operations;
1247                 inode->i_fop = &reiserfs_file_operations;
1248                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1249         } else if (S_ISDIR(inode->i_mode)) {
1250                 inode->i_op = &reiserfs_dir_inode_operations;
1251                 inode->i_fop = &reiserfs_dir_operations;
1252         } else if (S_ISLNK(inode->i_mode)) {
1253                 inode->i_op = &reiserfs_symlink_inode_operations;
1254                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1255         } else {
1256                 inode->i_blocks = 0;
1257                 inode->i_op = &reiserfs_special_inode_operations;
1258                 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
1259         }
1260 }
1261
1262 // update new stat data with inode fields
1263 static void inode2sd(void *sd, struct inode *inode, loff_t size)
1264 {
1265         struct stat_data *sd_v2 = (struct stat_data *)sd;
1266         uid_t uid = XIDINO_UID(XID_TAG(inode), inode->i_uid, inode->i_xid);
1267         gid_t gid = XIDINO_GID(XID_TAG(inode), inode->i_gid, inode->i_xid);
1268         __u16 flags;
1269
1270         set_sd_v2_uid(sd_v2, uid);
1271         set_sd_v2_gid(sd_v2, gid);
1272         set_sd_v2_mode(sd_v2, inode->i_mode);
1273         set_sd_v2_nlink(sd_v2, inode->i_nlink);
1274         set_sd_v2_size(sd_v2, size);
1275         set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
1276         set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
1277         set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
1278         set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
1279         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1280                 set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
1281         else
1282                 set_sd_v2_generation(sd_v2, inode->i_generation);
1283         flags = REISERFS_I(inode)->i_attrs;
1284         i_attrs_to_sd_attrs(inode, &flags);
1285         set_sd_v2_attrs(sd_v2, flags);
1286 }
1287
1288 // used to copy inode's fields to old stat data
1289 static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
1290 {
1291         struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
1292
1293         set_sd_v1_mode(sd_v1, inode->i_mode);
1294         set_sd_v1_uid(sd_v1, inode->i_uid);
1295         set_sd_v1_gid(sd_v1, inode->i_gid);
1296         set_sd_v1_nlink(sd_v1, inode->i_nlink);
1297         set_sd_v1_size(sd_v1, size);
1298         set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
1299         set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
1300         set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
1301
1302         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1303                 set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
1304         else
1305                 set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
1306
1307         // Sigh. i_first_direct_byte is back
1308         set_sd_v1_first_direct_byte(sd_v1,
1309                                     REISERFS_I(inode)->i_first_direct_byte);
1310 }
1311
1312 /* NOTE, you must prepare the buffer head before sending it here,
1313 ** and then log it after the call
1314 */
1315 static void update_stat_data(struct path *path, struct inode *inode,
1316                              loff_t size)
1317 {
1318         struct buffer_head *bh;
1319         struct item_head *ih;
1320
1321         bh = PATH_PLAST_BUFFER(path);
1322         ih = PATH_PITEM_HEAD(path);
1323
1324         if (!is_statdata_le_ih(ih))
1325                 reiserfs_panic(inode->i_sb,
1326                                "vs-13065: update_stat_data: key %k, found item %h",
1327                                INODE_PKEY(inode), ih);
1328
1329         if (stat_data_v1(ih)) {
1330                 // path points to old stat data
1331                 inode2sd_v1(B_I_PITEM(bh, ih), inode, size);
1332         } else {
1333                 inode2sd(B_I_PITEM(bh, ih), inode, size);
1334         }
1335
1336         return;
1337 }
1338
1339 void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1340                              struct inode *inode, loff_t size)
1341 {
1342         struct cpu_key key;
1343         INITIALIZE_PATH(path);
1344         struct buffer_head *bh;
1345         int fs_gen;
1346         struct item_head *ih, tmp_ih;
1347         int retval;
1348
1349         BUG_ON(!th->t_trans_id);
1350
1351         make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);        //key type is unimportant
1352
1353         for (;;) {
1354                 int pos;
1355                 /* look for the object's stat data */
1356                 retval = search_item(inode->i_sb, &key, &path);
1357                 if (retval == IO_ERROR) {
1358                         reiserfs_warning(inode->i_sb,
1359                                          "vs-13050: reiserfs_update_sd: "
1360                                          "i/o failure occurred trying to update %K stat data",
1361                                          &key);
1362                         return;
1363                 }
1364                 if (retval == ITEM_NOT_FOUND) {
1365                         pos = PATH_LAST_POSITION(&path);
1366                         pathrelse(&path);
1367                         if (inode->i_nlink == 0) {
1368                                 /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
1369                                 return;
1370                         }
1371                         reiserfs_warning(inode->i_sb,
1372                                          "vs-13060: reiserfs_update_sd: "
1373                                          "stat data of object %k (nlink == %d) not found (pos %d)",
1374                                          INODE_PKEY(inode), inode->i_nlink,
1375                                          pos);
1376                         reiserfs_check_path(&path);
1377                         return;
1378                 }
1379
1380                 /* sigh, prepare_for_journal might schedule.  When it schedules the
1381                  ** FS might change.  We have to detect that, and loop back to the
1382                  ** search if the stat data item has moved
1383                  */
1384                 bh = get_last_bh(&path);
1385                 ih = get_ih(&path);
1386                 copy_item_head(&tmp_ih, ih);
1387                 fs_gen = get_generation(inode->i_sb);
1388                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
1389                 if (fs_changed(fs_gen, inode->i_sb)
1390                     && item_moved(&tmp_ih, &path)) {
1391                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
1392                         continue;       /* Stat_data item has been moved after scheduling. */
1393                 }
1394                 break;
1395         }
1396         update_stat_data(&path, inode, size);
1397         journal_mark_dirty(th, th->t_super, bh);
1398         pathrelse(&path);
1399         return;
1400 }
1401
1402 /* reiserfs_read_locked_inode is called to read the inode off disk, and it
1403 ** does a make_bad_inode when things go wrong.  But, we need to make sure
1404 ** and clear the key in the private portion of the inode, otherwise a
1405 ** corresponding iput might try to delete whatever object the inode last
1406 ** represented.
1407 */
1408 static void reiserfs_make_bad_inode(struct inode *inode)
1409 {
1410         memset(INODE_PKEY(inode), 0, KEY_SIZE);
1411         make_bad_inode(inode);
1412 }
1413
1414 //
1415 // initially this function was derived from minix or ext2's analog and
1416 // evolved as the prototype did
1417 //
1418
1419 int reiserfs_init_locked_inode(struct inode *inode, void *p)
1420 {
1421         struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
1422         inode->i_ino = args->objectid;
1423         INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
1424         return 0;
1425 }
1426
1427 /* looks for stat data in the tree, and fills up the fields of in-core
1428    inode stat data fields */
1429 void reiserfs_read_locked_inode(struct inode *inode,
1430                                 struct reiserfs_iget_args *args)
1431 {
1432         INITIALIZE_PATH(path_to_sd);
1433         struct cpu_key key;
1434         unsigned long dirino;
1435         int retval;
1436
1437         dirino = args->dirid;
1438
1439         /* set version 1, version 2 could be used too, because stat data
1440            key is the same in both versions */
1441         key.version = KEY_FORMAT_3_5;
1442         key.on_disk_key.k_dir_id = dirino;
1443         key.on_disk_key.k_objectid = inode->i_ino;
1444         key.on_disk_key.k_offset = 0;
1445         key.on_disk_key.k_type = 0;
1446
1447         /* look for the object's stat data */
1448         retval = search_item(inode->i_sb, &key, &path_to_sd);
1449         if (retval == IO_ERROR) {
1450                 reiserfs_warning(inode->i_sb,
1451                                  "vs-13070: reiserfs_read_locked_inode: "
1452                                  "i/o failure occurred trying to find stat data of %K",
1453                                  &key);
1454                 reiserfs_make_bad_inode(inode);
1455                 return;
1456         }
1457         if (retval != ITEM_FOUND) {
1458                 /* a stale NFS handle can trigger this without it being an error */
1459                 pathrelse(&path_to_sd);
1460                 reiserfs_make_bad_inode(inode);
1461                 inode->i_nlink = 0;
1462                 return;
1463         }
1464
1465         init_inode(inode, &path_to_sd);
1466
1467         /* It is possible that knfsd is trying to access inode of a file
1468            that is being removed from the disk by some other thread. As we
1469            update sd on unlink all that is required is to check for nlink
1470            here. This bug was first found by Sizif when debugging
1471            SquidNG/Butterfly, forgotten, and found again after Philippe
1472            Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
1473
1474            More logical fix would require changes in fs/inode.c:iput() to
1475            remove inode from hash-table _after_ fs cleaned disk stuff up and
1476            in iget() to return NULL if I_FREEING inode is found in
1477            hash-table. */
1478         /* Currently there is one place where it's ok to meet inode with
1479            nlink==0: processing of open-unlinked and half-truncated files
1480            during mount (fs/reiserfs/super.c:finish_unfinished()). */
1481         if ((inode->i_nlink == 0) &&
1482             !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
1483                 reiserfs_warning(inode->i_sb,
1484                                  "vs-13075: reiserfs_read_locked_inode: "
1485                                  "dead inode read from disk %K. "
1486                                  "This is likely to be race with knfsd. Ignore",
1487                                  &key);
1488                 reiserfs_make_bad_inode(inode);
1489         }
1490
1491         reiserfs_check_path(&path_to_sd);       /* init inode should be relsing */
1492
1493 }
1494
1495 /**
1496  * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1497  *
1498  * @inode:    inode from hash table to check
1499  * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1500  *
1501  * This function is called by iget5_locked() to distinguish reiserfs inodes
1502  * having the same inode numbers. Such inodes can only exist due to some
1503  * error condition. One of them should be bad. Inodes with identical
1504  * inode numbers (objectids) are distinguished by parent directory ids.
1505  *
1506  */
1507 int reiserfs_find_actor(struct inode *inode, void *opaque)
1508 {
1509         struct reiserfs_iget_args *args;
1510
1511         args = opaque;
1512         /* args is already in CPU order */
1513         return (inode->i_ino == args->objectid) &&
1514             (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
1515 }
1516
1517 struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
1518 {
1519         struct inode *inode;
1520         struct reiserfs_iget_args args;
1521
1522         args.objectid = key->on_disk_key.k_objectid;
1523         args.dirid = key->on_disk_key.k_dir_id;
1524         inode = iget5_locked(s, key->on_disk_key.k_objectid,
1525                              reiserfs_find_actor, reiserfs_init_locked_inode,
1526                              (void *)(&args));
1527         if (!inode)
1528                 return ERR_PTR(-ENOMEM);
1529
1530         if (inode->i_state & I_NEW) {
1531                 reiserfs_read_locked_inode(inode, &args);
1532                 unlock_new_inode(inode);
1533         }
1534
1535         if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1536                 /* either due to i/o error or a stale NFS handle */
1537                 iput(inode);
1538                 inode = NULL;
1539         }
1540         return inode;
1541 }
1542
1543 struct dentry *reiserfs_get_dentry(struct super_block *sb, void *vobjp)
1544 {
1545         __u32 *data = vobjp;
1546         struct cpu_key key;
1547         struct dentry *result;
1548         struct inode *inode;
1549
1550         key.on_disk_key.k_objectid = data[0];
1551         key.on_disk_key.k_dir_id = data[1];
1552         reiserfs_write_lock(sb);
1553         inode = reiserfs_iget(sb, &key);
1554         if (inode && !IS_ERR(inode) && data[2] != 0 &&
1555             data[2] != inode->i_generation) {
1556                 iput(inode);
1557                 inode = NULL;
1558         }
1559         reiserfs_write_unlock(sb);
1560         if (!inode)
1561                 inode = ERR_PTR(-ESTALE);
1562         if (IS_ERR(inode))
1563                 return ERR_PTR(PTR_ERR(inode));
1564         result = d_alloc_anon(inode);
1565         if (!result) {
1566                 iput(inode);
1567                 return ERR_PTR(-ENOMEM);
1568         }
1569         return result;
1570 }
1571
1572 struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 * data,
1573                                   int len, int fhtype,
1574                                   int (*acceptable) (void *contect,
1575                                                      struct dentry * de),
1576                                   void *context)
1577 {
1578         __u32 obj[3], parent[3];
1579
1580         /* fhtype happens to reflect the number of u32s encoded.
1581          * due to a bug in earlier code, fhtype might indicate there
1582          * are more u32s then actually fitted.
1583          * so if fhtype seems to be more than len, reduce fhtype.
1584          * Valid types are:
1585          *   2 - objectid + dir_id - legacy support
1586          *   3 - objectid + dir_id + generation
1587          *   4 - objectid + dir_id + objectid and dirid of parent - legacy
1588          *   5 - objectid + dir_id + generation + objectid and dirid of parent
1589          *   6 - as above plus generation of directory
1590          * 6 does not fit in NFSv2 handles
1591          */
1592         if (fhtype > len) {
1593                 if (fhtype != 6 || len != 5)
1594                         reiserfs_warning(sb,
1595                                          "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1596                                          fhtype, len);
1597                 fhtype = 5;
1598         }
1599
1600         obj[0] = data[0];
1601         obj[1] = data[1];
1602         if (fhtype == 3 || fhtype >= 5)
1603                 obj[2] = data[2];
1604         else
1605                 obj[2] = 0;     /* generation number */
1606
1607         if (fhtype >= 4) {
1608                 parent[0] = data[fhtype >= 5 ? 3 : 2];
1609                 parent[1] = data[fhtype >= 5 ? 4 : 3];
1610                 if (fhtype == 6)
1611                         parent[2] = data[5];
1612                 else
1613                         parent[2] = 0;
1614         }
1615         return sb->s_export_op->find_exported_dentry(sb, obj,
1616                                                      fhtype < 4 ? NULL : parent,
1617                                                      acceptable, context);
1618 }
1619
1620 int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
1621                        int need_parent)
1622 {
1623         struct inode *inode = dentry->d_inode;
1624         int maxlen = *lenp;
1625
1626         if (maxlen < 3)
1627                 return 255;
1628
1629         data[0] = inode->i_ino;
1630         data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1631         data[2] = inode->i_generation;
1632         *lenp = 3;
1633         /* no room for directory info? return what we've stored so far */
1634         if (maxlen < 5 || !need_parent)
1635                 return 3;
1636
1637         spin_lock(&dentry->d_lock);
1638         inode = dentry->d_parent->d_inode;
1639         data[3] = inode->i_ino;
1640         data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1641         *lenp = 5;
1642         if (maxlen >= 6) {
1643                 data[5] = inode->i_generation;
1644                 *lenp = 6;
1645         }
1646         spin_unlock(&dentry->d_lock);
1647         return *lenp;
1648 }
1649
1650 /* looks for stat data, then copies fields to it, marks the buffer
1651    containing stat data as dirty */
1652 /* reiserfs inodes are never really dirty, since the dirty inode call
1653 ** always logs them.  This call allows the VFS inode marking routines
1654 ** to properly mark inodes for datasync and such, but only actually
1655 ** does something when called for a synchronous update.
1656 */
1657 int reiserfs_write_inode(struct inode *inode, int do_sync)
1658 {
1659         struct reiserfs_transaction_handle th;
1660         int jbegin_count = 1;
1661
1662         if (inode->i_sb->s_flags & MS_RDONLY)
1663                 return -EROFS;
1664         /* memory pressure can sometimes initiate write_inode calls with sync == 1,
1665          ** these cases are just when the system needs ram, not when the
1666          ** inode needs to reach disk for safety, and they can safely be
1667          ** ignored because the altered inode has already been logged.
1668          */
1669         if (do_sync && !(current->flags & PF_MEMALLOC)) {
1670                 reiserfs_write_lock(inode->i_sb);
1671                 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1672                         reiserfs_update_sd(&th, inode);
1673                         journal_end_sync(&th, inode->i_sb, jbegin_count);
1674                 }
1675                 reiserfs_write_unlock(inode->i_sb);
1676         }
1677         return 0;
1678 }
1679
1680 /* stat data of new object is inserted already, this inserts the item
1681    containing "." and ".." entries */
1682 static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1683                                   struct inode *inode,
1684                                   struct item_head *ih, struct path *path,
1685                                   struct inode *dir)
1686 {
1687         struct super_block *sb = th->t_super;
1688         char empty_dir[EMPTY_DIR_SIZE];
1689         char *body = empty_dir;
1690         struct cpu_key key;
1691         int retval;
1692
1693         BUG_ON(!th->t_trans_id);
1694
1695         _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1696                       le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1697                       TYPE_DIRENTRY, 3 /*key length */ );
1698
1699         /* compose item head for new item. Directories consist of items of
1700            old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1701            is done by reiserfs_new_inode */
1702         if (old_format_only(sb)) {
1703                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1704                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1705
1706                 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1707                                        ih->ih_key.k_objectid,
1708                                        INODE_PKEY(dir)->k_dir_id,
1709                                        INODE_PKEY(dir)->k_objectid);
1710         } else {
1711                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1712                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1713
1714                 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1715                                     ih->ih_key.k_objectid,
1716                                     INODE_PKEY(dir)->k_dir_id,
1717                                     INODE_PKEY(dir)->k_objectid);
1718         }
1719
1720         /* look for place in the tree for new item */
1721         retval = search_item(sb, &key, path);
1722         if (retval == IO_ERROR) {
1723                 reiserfs_warning(sb, "vs-13080: reiserfs_new_directory: "
1724                                  "i/o failure occurred creating new directory");
1725                 return -EIO;
1726         }
1727         if (retval == ITEM_FOUND) {
1728                 pathrelse(path);
1729                 reiserfs_warning(sb, "vs-13070: reiserfs_new_directory: "
1730                                  "object with this key exists (%k)",
1731                                  &(ih->ih_key));
1732                 return -EEXIST;
1733         }
1734
1735         /* insert item, that is empty directory item */
1736         return reiserfs_insert_item(th, path, &key, ih, inode, body);
1737 }
1738
1739 /* stat data of object has been inserted, this inserts the item
1740    containing the body of symlink */
1741 static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode,    /* Inode of symlink */
1742                                 struct item_head *ih,
1743                                 struct path *path, const char *symname,
1744                                 int item_len)
1745 {
1746         struct super_block *sb = th->t_super;
1747         struct cpu_key key;
1748         int retval;
1749
1750         BUG_ON(!th->t_trans_id);
1751
1752         _make_cpu_key(&key, KEY_FORMAT_3_5,
1753                       le32_to_cpu(ih->ih_key.k_dir_id),
1754                       le32_to_cpu(ih->ih_key.k_objectid),
1755                       1, TYPE_DIRECT, 3 /*key length */ );
1756
1757         make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1758                           0 /*free_space */ );
1759
1760         /* look for place in the tree for new item */
1761         retval = search_item(sb, &key, path);
1762         if (retval == IO_ERROR) {
1763                 reiserfs_warning(sb, "vs-13080: reiserfs_new_symlinik: "
1764                                  "i/o failure occurred creating new symlink");
1765                 return -EIO;
1766         }
1767         if (retval == ITEM_FOUND) {
1768                 pathrelse(path);
1769                 reiserfs_warning(sb, "vs-13080: reiserfs_new_symlink: "
1770                                  "object with this key exists (%k)",
1771                                  &(ih->ih_key));
1772                 return -EEXIST;
1773         }
1774
1775         /* insert item, that is body of symlink */
1776         return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1777 }
1778
1779 /* inserts the stat data into the tree, and then calls
1780    reiserfs_new_directory (to insert ".", ".." item if new object is
1781    directory) or reiserfs_new_symlink (to insert symlink body if new
1782    object is symlink) or nothing (if new object is regular file)
1783
1784    NOTE! uid and gid must already be set in the inode.  If we return
1785    non-zero due to an error, we have to drop the quota previously allocated
1786    for the fresh inode.  This can only be done outside a transaction, so
1787    if we return non-zero, we also end the transaction.  */
1788 int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1789                        struct inode *dir, int mode, const char *symname,
1790                        /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1791                           strlen (symname) for symlinks) */
1792                        loff_t i_size, struct dentry *dentry,
1793                        struct inode *inode)
1794 {
1795         struct super_block *sb;
1796         INITIALIZE_PATH(path_to_key);
1797         struct cpu_key key;
1798         struct item_head ih;
1799         struct stat_data sd;
1800         int retval;
1801         int err;
1802
1803         BUG_ON(!th->t_trans_id);
1804
1805         if (DLIMIT_ALLOC_INODE(inode)) {
1806                 err = -ENOSPC;
1807                 goto out_bad_dlimit;
1808         }
1809         if (DQUOT_ALLOC_INODE(inode)) {
1810                 err = -EDQUOT;
1811                 goto out_end_trans;
1812         }
1813         if (!dir || !dir->i_nlink) {
1814                 err = -EPERM;
1815                 goto out_bad_inode;
1816         }
1817
1818         sb = dir->i_sb;
1819
1820         /* item head of new item */
1821         ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1822         ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1823         if (!ih.ih_key.k_objectid) {
1824                 err = -ENOMEM;
1825                 goto out_bad_inode;
1826         }
1827         if (old_format_only(sb))
1828                 /* not a perfect generation count, as object ids can be reused, but
1829                  ** this is as good as reiserfs can do right now.
1830                  ** note that the private part of inode isn't filled in yet, we have
1831                  ** to use the directory.
1832                  */
1833                 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1834         else
1835 #if defined( USE_INODE_GENERATION_COUNTER )
1836                 inode->i_generation =
1837                     le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1838 #else
1839                 inode->i_generation = ++event;
1840 #endif
1841
1842         /* fill stat data */
1843         inode->i_nlink = (S_ISDIR(mode) ? 2 : 1);
1844
1845         /* uid and gid must already be set by the caller for quota init */
1846
1847         /* symlink cannot be immutable or append only, right? */
1848         if (S_ISLNK(inode->i_mode))
1849                 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1850
1851         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1852         inode->i_size = i_size;
1853         inode->i_blocks = 0;
1854         inode->i_bytes = 0;
1855         REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1856             U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1857
1858         INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1859         REISERFS_I(inode)->i_flags = 0;
1860         REISERFS_I(inode)->i_prealloc_block = 0;
1861         REISERFS_I(inode)->i_prealloc_count = 0;
1862         REISERFS_I(inode)->i_trans_id = 0;
1863         REISERFS_I(inode)->i_jl = NULL;
1864         REISERFS_I(inode)->i_attrs =
1865             REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1866         sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
1867         REISERFS_I(inode)->i_acl_access = NULL;
1868         REISERFS_I(inode)->i_acl_default = NULL;
1869         init_rwsem(&REISERFS_I(inode)->xattr_sem);
1870
1871         if (old_format_only(sb))
1872                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1873                                   TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1874         else
1875                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1876                                   TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1877
1878         /* key to search for correct place for new stat data */
1879         _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1880                       le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1881                       TYPE_STAT_DATA, 3 /*key length */ );
1882
1883         /* find proper place for inserting of stat data */
1884         retval = search_item(sb, &key, &path_to_key);
1885         if (retval == IO_ERROR) {
1886                 err = -EIO;
1887                 goto out_bad_inode;
1888         }
1889         if (retval == ITEM_FOUND) {
1890                 pathrelse(&path_to_key);
1891                 err = -EEXIST;
1892                 goto out_bad_inode;
1893         }
1894         if (old_format_only(sb)) {
1895                 if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1896                         pathrelse(&path_to_key);
1897                         /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1898                         err = -EINVAL;
1899                         goto out_bad_inode;
1900                 }
1901                 inode2sd_v1(&sd, inode, inode->i_size);
1902         } else {
1903                 inode2sd(&sd, inode, inode->i_size);
1904         }
1905         // these do not go to on-disk stat data
1906         inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1907         inode->i_blksize = reiserfs_default_io_size;
1908
1909         // store in in-core inode the key of stat data and version all
1910         // object items will have (directory items will have old offset
1911         // format, other new objects will consist of new items)
1912         memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1913         if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1914                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1915         else
1916                 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1917         if (old_format_only(sb))
1918                 set_inode_sd_version(inode, STAT_DATA_V1);
1919         else
1920                 set_inode_sd_version(inode, STAT_DATA_V2);
1921
1922         /* insert the stat data into the tree */
1923 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1924         if (REISERFS_I(dir)->new_packing_locality)
1925                 th->displace_new_blocks = 1;
1926 #endif
1927         retval =
1928             reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1929                                  (char *)(&sd));
1930         if (retval) {
1931                 err = retval;
1932                 reiserfs_check_path(&path_to_key);
1933                 goto out_bad_inode;
1934         }
1935 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1936         if (!th->displace_new_blocks)
1937                 REISERFS_I(dir)->new_packing_locality = 0;
1938 #endif
1939         if (S_ISDIR(mode)) {
1940                 /* insert item with "." and ".." */
1941                 retval =
1942                     reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1943         }
1944
1945         if (S_ISLNK(mode)) {
1946                 /* insert body of symlink */
1947                 if (!old_format_only(sb))
1948                         i_size = ROUND_UP(i_size);
1949                 retval =
1950                     reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1951                                          i_size);
1952         }
1953         if (retval) {
1954                 err = retval;
1955                 reiserfs_check_path(&path_to_key);
1956                 journal_end(th, th->t_super, th->t_blocks_allocated);
1957                 goto out_inserted_sd;
1958         }
1959
1960         /* XXX CHECK THIS */
1961         if (reiserfs_posixacl(inode->i_sb)) {
1962                 retval = reiserfs_inherit_default_acl(dir, dentry, inode);
1963                 if (retval) {
1964                         err = retval;
1965                         reiserfs_check_path(&path_to_key);
1966                         journal_end(th, th->t_super, th->t_blocks_allocated);
1967                         goto out_inserted_sd;
1968                 }
1969         } else if (inode->i_sb->s_flags & MS_POSIXACL) {
1970                 reiserfs_warning(inode->i_sb, "ACLs aren't enabled in the fs, "
1971                                  "but vfs thinks they are!");
1972         } else if (is_reiserfs_priv_object(dir)) {
1973                 reiserfs_mark_inode_private(inode);
1974         }
1975
1976         insert_inode_hash(inode);
1977         reiserfs_update_sd(th, inode);
1978         reiserfs_check_path(&path_to_key);
1979
1980         return 0;
1981
1982 /* it looks like you can easily compress these two goto targets into
1983  * one.  Keeping it like this doesn't actually hurt anything, and they
1984  * are place holders for what the quota code actually needs.
1985  */
1986       out_bad_inode:
1987         /* Invalidate the object, nothing was inserted yet */
1988         INODE_PKEY(inode)->k_objectid = 0;
1989
1990         /* Quota change must be inside a transaction for journaling */
1991         DQUOT_FREE_INODE(inode);
1992
1993       out_end_trans:
1994         DLIMIT_FREE_INODE(inode);
1995
1996       out_bad_dlimit:
1997         journal_end(th, th->t_super, th->t_blocks_allocated);
1998         /* Drop can be outside and it needs more credits so it's better to have it outside */
1999         DQUOT_DROP(inode);
2000         inode->i_flags |= S_NOQUOTA;
2001         make_bad_inode(inode);
2002
2003       out_inserted_sd:
2004         inode->i_nlink = 0;
2005         th->t_trans_id = 0;     /* so the caller can't use this handle later */
2006
2007         /* If we were inheriting an ACL, we need to release the lock so that
2008          * iput doesn't deadlock in reiserfs_delete_xattrs. The locking
2009          * code really needs to be reworked, but this will take care of it
2010          * for now. -jeffm */
2011         if (REISERFS_I(dir)->i_acl_default && !IS_ERR(REISERFS_I(dir)->i_acl_default)) {
2012                 reiserfs_write_unlock_xattrs(dir->i_sb);
2013                 iput(inode);
2014                 reiserfs_write_lock_xattrs(dir->i_sb);
2015         } else
2016                 iput(inode);
2017         return err;
2018 }
2019
2020 /*
2021 ** finds the tail page in the page cache,
2022 ** reads the last block in.
2023 **
2024 ** On success, page_result is set to a locked, pinned page, and bh_result
2025 ** is set to an up to date buffer for the last block in the file.  returns 0.
2026 **
2027 ** tail conversion is not done, so bh_result might not be valid for writing
2028 ** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2029 ** trying to write the block.
2030 **
2031 ** on failure, nonzero is returned, page_result and bh_result are untouched.
2032 */
2033 static int grab_tail_page(struct inode *p_s_inode,
2034                           struct page **page_result,
2035                           struct buffer_head **bh_result)
2036 {
2037
2038         /* we want the page with the last byte in the file,
2039          ** not the page that will hold the next byte for appending
2040          */
2041         unsigned long index = (p_s_inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2042         unsigned long pos = 0;
2043         unsigned long start = 0;
2044         unsigned long blocksize = p_s_inode->i_sb->s_blocksize;
2045         unsigned long offset = (p_s_inode->i_size) & (PAGE_CACHE_SIZE - 1);
2046         struct buffer_head *bh;
2047         struct buffer_head *head;
2048         struct page *page;
2049         int error;
2050
2051         /* we know that we are only called with inode->i_size > 0.
2052          ** we also know that a file tail can never be as big as a block
2053          ** If i_size % blocksize == 0, our file is currently block aligned
2054          ** and it won't need converting or zeroing after a truncate.
2055          */
2056         if ((offset & (blocksize - 1)) == 0) {
2057                 return -ENOENT;
2058         }
2059         page = grab_cache_page(p_s_inode->i_mapping, index);
2060         error = -ENOMEM;
2061         if (!page) {
2062                 goto out;
2063         }
2064         /* start within the page of the last block in the file */
2065         start = (offset / blocksize) * blocksize;
2066
2067         error = block_prepare_write(page, start, offset,
2068                                     reiserfs_get_block_create_0);
2069         if (error)
2070                 goto unlock;
2071
2072         head = page_buffers(page);
2073         bh = head;
2074         do {
2075                 if (pos >= start) {
2076                         break;
2077                 }
2078                 bh = bh->b_this_page;
2079                 pos += blocksize;
2080         } while (bh != head);
2081
2082         if (!buffer_uptodate(bh)) {
2083                 /* note, this should never happen, prepare_write should
2084                  ** be taking care of this for us.  If the buffer isn't up to date,
2085                  ** I've screwed up the code to find the buffer, or the code to
2086                  ** call prepare_write
2087                  */
2088                 reiserfs_warning(p_s_inode->i_sb,
2089                                  "clm-6000: error reading block %lu on dev %s",
2090                                  bh->b_blocknr,
2091                                  reiserfs_bdevname(p_s_inode->i_sb));
2092                 error = -EIO;
2093                 goto unlock;
2094         }
2095         *bh_result = bh;
2096         *page_result = page;
2097
2098       out:
2099         return error;
2100
2101       unlock:
2102         unlock_page(page);
2103         page_cache_release(page);
2104         return error;
2105 }
2106
2107 /*
2108 ** vfs version of truncate file.  Must NOT be called with
2109 ** a transaction already started.
2110 **
2111 ** some code taken from block_truncate_page
2112 */
2113 int reiserfs_truncate_file(struct inode *p_s_inode, int update_timestamps)
2114 {
2115         struct reiserfs_transaction_handle th;
2116         /* we want the offset for the first byte after the end of the file */
2117         unsigned long offset = p_s_inode->i_size & (PAGE_CACHE_SIZE - 1);
2118         unsigned blocksize = p_s_inode->i_sb->s_blocksize;
2119         unsigned length;
2120         struct page *page = NULL;
2121         int error;
2122         struct buffer_head *bh = NULL;
2123         int err2;
2124
2125         reiserfs_write_lock(p_s_inode->i_sb);
2126
2127         if (p_s_inode->i_size > 0) {
2128                 if ((error = grab_tail_page(p_s_inode, &page, &bh))) {
2129                         // -ENOENT means we truncated past the end of the file,
2130                         // and get_block_create_0 could not find a block to read in,
2131                         // which is ok.
2132                         if (error != -ENOENT)
2133                                 reiserfs_warning(p_s_inode->i_sb,
2134                                                  "clm-6001: grab_tail_page failed %d",
2135                                                  error);
2136                         page = NULL;
2137                         bh = NULL;
2138                 }
2139         }
2140
2141         /* so, if page != NULL, we have a buffer head for the offset at
2142          ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2143          ** then we have an unformatted node.  Otherwise, we have a direct item,
2144          ** and no zeroing is required on disk.  We zero after the truncate,
2145          ** because the truncate might pack the item anyway
2146          ** (it will unmap bh if it packs).
2147          */
2148         /* it is enough to reserve space in transaction for 2 balancings:
2149            one for "save" link adding and another for the first
2150            cut_from_item. 1 is for update_sd */
2151         error = journal_begin(&th, p_s_inode->i_sb,
2152                               JOURNAL_PER_BALANCE_CNT * 2 + 1);
2153         if (error)
2154                 goto out;
2155         reiserfs_update_inode_transaction(p_s_inode);
2156         if (update_timestamps)
2157                 /* we are doing real truncate: if the system crashes before the last
2158                    transaction of truncating gets committed - on reboot the file
2159                    either appears truncated properly or not truncated at all */
2160                 add_save_link(&th, p_s_inode, 1);
2161         err2 = reiserfs_do_truncate(&th, p_s_inode, page, update_timestamps);
2162         error =
2163             journal_end(&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2164         if (error)
2165                 goto out;
2166
2167         /* check reiserfs_do_truncate after ending the transaction */
2168         if (err2) {
2169                 error = err2;
2170                 goto out;
2171         }
2172
2173         if (update_timestamps) {
2174                 error = remove_save_link(p_s_inode, 1 /* truncate */ );
2175                 if (error)
2176                         goto out;
2177         }
2178
2179         if (page) {
2180                 length = offset & (blocksize - 1);
2181                 /* if we are not on a block boundary */
2182                 if (length) {
2183                         char *kaddr;
2184
2185                         length = blocksize - length;
2186                         kaddr = kmap_atomic(page, KM_USER0);
2187                         memset(kaddr + offset, 0, length);
2188                         flush_dcache_page(page);
2189                         kunmap_atomic(kaddr, KM_USER0);
2190                         if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2191                                 mark_buffer_dirty(bh);
2192                         }
2193                 }
2194                 unlock_page(page);
2195                 page_cache_release(page);
2196         }
2197
2198         reiserfs_write_unlock(p_s_inode->i_sb);
2199         return 0;
2200       out:
2201         if (page) {
2202                 unlock_page(page);
2203                 page_cache_release(page);
2204         }
2205         reiserfs_write_unlock(p_s_inode->i_sb);
2206         return error;
2207 }
2208
2209 static int map_block_for_writepage(struct inode *inode,
2210                                    struct buffer_head *bh_result,
2211                                    unsigned long block)
2212 {
2213         struct reiserfs_transaction_handle th;
2214         int fs_gen;
2215         struct item_head tmp_ih;
2216         struct item_head *ih;
2217         struct buffer_head *bh;
2218         __le32 *item;
2219         struct cpu_key key;
2220         INITIALIZE_PATH(path);
2221         int pos_in_item;
2222         int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2223         loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2224         int retval;
2225         int use_get_block = 0;
2226         int bytes_copied = 0;
2227         int copy_size;
2228         int trans_running = 0;
2229
2230         /* catch places below that try to log something without starting a trans */
2231         th.t_trans_id = 0;
2232
2233         if (!buffer_uptodate(bh_result)) {
2234                 return -EIO;
2235         }
2236
2237         kmap(bh_result->b_page);
2238       start_over:
2239         reiserfs_write_lock(inode->i_sb);
2240         make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2241
2242       research:
2243         retval = search_for_position_by_key(inode->i_sb, &key, &path);
2244         if (retval != POSITION_FOUND) {
2245                 use_get_block = 1;
2246                 goto out;
2247         }
2248
2249         bh = get_last_bh(&path);
2250         ih = get_ih(&path);
2251         item = get_item(&path);
2252         pos_in_item = path.pos_in_item;
2253
2254         /* we've found an unformatted node */
2255         if (indirect_item_found(retval, ih)) {
2256                 if (bytes_copied > 0) {
2257                         reiserfs_warning(inode->i_sb,
2258                                          "clm-6002: bytes_copied %d",
2259                                          bytes_copied);
2260                 }
2261                 if (!get_block_num(item, pos_in_item)) {
2262                         /* crap, we are writing to a hole */
2263                         use_get_block = 1;
2264                         goto out;
2265                 }
2266                 set_block_dev_mapped(bh_result,
2267                                      get_block_num(item, pos_in_item), inode);
2268         } else if (is_direct_le_ih(ih)) {
2269                 char *p;
2270                 p = page_address(bh_result->b_page);
2271                 p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2272                 copy_size = ih_item_len(ih) - pos_in_item;
2273
2274                 fs_gen = get_generation(inode->i_sb);
2275                 copy_item_head(&tmp_ih, ih);
2276
2277                 if (!trans_running) {
2278                         /* vs-3050 is gone, no need to drop the path */
2279                         retval = journal_begin(&th, inode->i_sb, jbegin_count);
2280                         if (retval)
2281                                 goto out;
2282                         reiserfs_update_inode_transaction(inode);
2283                         trans_running = 1;
2284                         if (fs_changed(fs_gen, inode->i_sb)
2285                             && item_moved(&tmp_ih, &path)) {
2286                                 reiserfs_restore_prepared_buffer(inode->i_sb,
2287                                                                  bh);
2288                                 goto research;
2289                         }
2290                 }
2291
2292                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2293
2294                 if (fs_changed(fs_gen, inode->i_sb)
2295                     && item_moved(&tmp_ih, &path)) {
2296                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2297                         goto research;
2298                 }
2299
2300                 memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2301                        copy_size);
2302
2303                 journal_mark_dirty(&th, inode->i_sb, bh);
2304                 bytes_copied += copy_size;
2305                 set_block_dev_mapped(bh_result, 0, inode);
2306
2307                 /* are there still bytes left? */
2308                 if (bytes_copied < bh_result->b_size &&
2309                     (byte_offset + bytes_copied) < inode->i_size) {
2310                         set_cpu_key_k_offset(&key,
2311                                              cpu_key_k_offset(&key) +
2312                                              copy_size);
2313                         goto research;
2314                 }
2315         } else {
2316                 reiserfs_warning(inode->i_sb,
2317                                  "clm-6003: bad item inode %lu, device %s",
2318                                  inode->i_ino, reiserfs_bdevname(inode->i_sb));
2319                 retval = -EIO;
2320                 goto out;
2321         }
2322         retval = 0;
2323
2324       out:
2325         pathrelse(&path);
2326         if (trans_running) {
2327                 int err = journal_end(&th, inode->i_sb, jbegin_count);
2328                 if (err)
2329                         retval = err;
2330                 trans_running = 0;
2331         }
2332         reiserfs_write_unlock(inode->i_sb);
2333
2334         /* this is where we fill in holes in the file. */
2335         if (use_get_block) {
2336                 retval = reiserfs_get_block(inode, block, bh_result,
2337                                             GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2338                                             | GET_BLOCK_NO_DANGLE);
2339                 if (!retval) {
2340                         if (!buffer_mapped(bh_result)
2341                             || bh_result->b_blocknr == 0) {
2342                                 /* get_block failed to find a mapped unformatted node. */
2343                                 use_get_block = 0;
2344                                 goto start_over;
2345                         }
2346                 }
2347         }
2348         kunmap(bh_result->b_page);
2349
2350         if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2351                 /* we've copied data from the page into the direct item, so the
2352                  * buffer in the page is now clean, mark it to reflect that.
2353                  */
2354                 lock_buffer(bh_result);
2355                 clear_buffer_dirty(bh_result);
2356                 unlock_buffer(bh_result);
2357         }
2358         return retval;
2359 }
2360
2361 /*
2362  * mason@suse.com: updated in 2.5.54 to follow the same general io
2363  * start/recovery path as __block_write_full_page, along with special
2364  * code to handle reiserfs tails.
2365  */
2366 static int reiserfs_write_full_page(struct page *page,
2367                                     struct writeback_control *wbc)
2368 {
2369         struct inode *inode = page->mapping->host;
2370         unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2371         int error = 0;
2372         unsigned long block;
2373         struct buffer_head *head, *bh;
2374         int partial = 0;
2375         int nr = 0;
2376         int checked = PageChecked(page);
2377         struct reiserfs_transaction_handle th;
2378         struct super_block *s = inode->i_sb;
2379         int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2380         th.t_trans_id = 0;
2381
2382         /* no logging allowed when nonblocking or from PF_MEMALLOC */
2383         if (checked && (current->flags & PF_MEMALLOC)) {
2384                 redirty_page_for_writepage(wbc, page);
2385                 unlock_page(page);
2386                 return 0;
2387         }
2388
2389         /* The page dirty bit is cleared before writepage is called, which
2390          * means we have to tell create_empty_buffers to make dirty buffers
2391          * The page really should be up to date at this point, so tossing
2392          * in the BH_Uptodate is just a sanity check.
2393          */
2394         if (!page_has_buffers(page)) {
2395                 create_empty_buffers(page, s->s_blocksize,
2396                                      (1 << BH_Dirty) | (1 << BH_Uptodate));
2397         }
2398         head = page_buffers(page);
2399
2400         /* last page in the file, zero out any contents past the
2401          ** last byte in the file
2402          */
2403         if (page->index >= end_index) {
2404                 char *kaddr;
2405                 unsigned last_offset;
2406
2407                 last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2408                 /* no file contents in this page */
2409                 if (page->index >= end_index + 1 || !last_offset) {
2410                         unlock_page(page);
2411                         return 0;
2412                 }
2413                 kaddr = kmap_atomic(page, KM_USER0);
2414                 memset(kaddr + last_offset, 0, PAGE_CACHE_SIZE - last_offset);
2415                 flush_dcache_page(page);
2416                 kunmap_atomic(kaddr, KM_USER0);
2417         }
2418         bh = head;
2419         block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2420         /* first map all the buffers, logging any direct items we find */
2421         do {
2422                 if ((checked || buffer_dirty(bh)) && (!buffer_mapped(bh) ||
2423                                                       (buffer_mapped(bh)
2424                                                        && bh->b_blocknr ==
2425                                                        0))) {
2426                         /* not mapped yet, or it points to a direct item, search
2427                          * the btree for the mapping info, and log any direct
2428                          * items found
2429                          */
2430                         if ((error = map_block_for_writepage(inode, bh, block))) {
2431                                 goto fail;
2432                         }
2433                 }
2434                 bh = bh->b_this_page;
2435                 block++;
2436         } while (bh != head);
2437
2438         /*
2439          * we start the transaction after map_block_for_writepage,
2440          * because it can create holes in the file (an unbounded operation).
2441          * starting it here, we can make a reliable estimate for how many
2442          * blocks we're going to log
2443          */
2444         if (checked) {
2445                 ClearPageChecked(page);
2446                 reiserfs_write_lock(s);
2447                 error = journal_begin(&th, s, bh_per_page + 1);
2448                 if (error) {
2449                         reiserfs_write_unlock(s);
2450                         goto fail;
2451                 }
2452                 reiserfs_update_inode_transaction(inode);
2453         }
2454         /* now go through and lock any dirty buffers on the page */
2455         do {
2456                 get_bh(bh);
2457                 if (!buffer_mapped(bh))
2458                         continue;
2459                 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2460                         continue;
2461
2462                 if (checked) {
2463                         reiserfs_prepare_for_journal(s, bh, 1);
2464                         journal_mark_dirty(&th, s, bh);
2465                         continue;
2466                 }
2467                 /* from this point on, we know the buffer is mapped to a
2468                  * real block and not a direct item
2469                  */
2470                 if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
2471                         lock_buffer(bh);
2472                 } else {
2473                         if (test_set_buffer_locked(bh)) {
2474                                 redirty_page_for_writepage(wbc, page);
2475                                 continue;
2476                         }
2477                 }
2478                 if (test_clear_buffer_dirty(bh)) {
2479                         mark_buffer_async_write(bh);
2480                 } else {
2481                         unlock_buffer(bh);
2482                 }
2483         } while ((bh = bh->b_this_page) != head);
2484
2485         if (checked) {
2486                 error = journal_end(&th, s, bh_per_page + 1);
2487                 reiserfs_write_unlock(s);
2488                 if (error)
2489                         goto fail;
2490         }
2491         BUG_ON(PageWriteback(page));
2492         set_page_writeback(page);
2493         unlock_page(page);
2494
2495         /*
2496          * since any buffer might be the only dirty buffer on the page,
2497          * the first submit_bh can bring the page out of writeback.
2498          * be careful with the buffers.
2499          */
2500         do {
2501                 struct buffer_head *next = bh->b_this_page;
2502                 if (buffer_async_write(bh)) {
2503                         submit_bh(WRITE, bh);
2504                         nr++;
2505                 }
2506                 put_bh(bh);
2507                 bh = next;
2508         } while (bh != head);
2509
2510         error = 0;
2511       done:
2512         if (nr == 0) {
2513                 /*
2514                  * if this page only had a direct item, it is very possible for
2515                  * no io to be required without there being an error.  Or,
2516                  * someone else could have locked them and sent them down the
2517                  * pipe without locking the page
2518                  */
2519                 bh = head;
2520                 do {
2521                         if (!buffer_uptodate(bh)) {
2522                                 partial = 1;
2523                                 break;
2524                         }
2525                         bh = bh->b_this_page;
2526                 } while (bh != head);
2527                 if (!partial)
2528                         SetPageUptodate(page);
2529                 end_page_writeback(page);
2530         }
2531         return error;
2532
2533       fail:
2534         /* catches various errors, we need to make sure any valid dirty blocks
2535          * get to the media.  The page is currently locked and not marked for
2536          * writeback
2537          */
2538         ClearPageUptodate(page);
2539         bh = head;
2540         do {
2541                 get_bh(bh);
2542                 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2543                         lock_buffer(bh);
2544                         mark_buffer_async_write(bh);
2545                 } else {
2546                         /*
2547                          * clear any dirty bits that might have come from getting
2548                          * attached to a dirty page
2549                          */
2550                         clear_buffer_dirty(bh);
2551                 }
2552                 bh = bh->b_this_page;
2553         } while (bh != head);
2554         SetPageError(page);
2555         BUG_ON(PageWriteback(page));
2556         set_page_writeback(page);
2557         unlock_page(page);
2558         do {
2559                 struct buffer_head *next = bh->b_this_page;
2560                 if (buffer_async_write(bh)) {
2561                         clear_buffer_dirty(bh);
2562                         submit_bh(WRITE, bh);
2563                         nr++;
2564                 }
2565                 put_bh(bh);
2566                 bh = next;
2567         } while (bh != head);
2568         goto done;
2569 }
2570
2571 static int reiserfs_readpage(struct file *f, struct page *page)
2572 {
2573         return block_read_full_page(page, reiserfs_get_block);
2574 }
2575
2576 static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2577 {
2578         struct inode *inode = page->mapping->host;
2579         reiserfs_wait_on_write_block(inode->i_sb);
2580         return reiserfs_write_full_page(page, wbc);
2581 }
2582
2583 static int reiserfs_prepare_write(struct file *f, struct page *page,
2584                                   unsigned from, unsigned to)
2585 {
2586         struct inode *inode = page->mapping->host;
2587         int ret;
2588         int old_ref = 0;
2589
2590         reiserfs_wait_on_write_block(inode->i_sb);
2591         fix_tail_page_for_writing(page);
2592         if (reiserfs_transaction_running(inode->i_sb)) {
2593                 struct reiserfs_transaction_handle *th;
2594                 th = (struct reiserfs_transaction_handle *)current->
2595                     journal_info;
2596                 BUG_ON(!th->t_refcount);
2597                 BUG_ON(!th->t_trans_id);
2598                 old_ref = th->t_refcount;
2599                 th->t_refcount++;
2600         }
2601
2602         ret = block_prepare_write(page, from, to, reiserfs_get_block);
2603         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2604                 struct reiserfs_transaction_handle *th = current->journal_info;
2605                 /* this gets a little ugly.  If reiserfs_get_block returned an
2606                  * error and left a transacstion running, we've got to close it,
2607                  * and we've got to free handle if it was a persistent transaction.
2608                  *
2609                  * But, if we had nested into an existing transaction, we need
2610                  * to just drop the ref count on the handle.
2611                  *
2612                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2613                  * and it was a persistent trans.  Otherwise, it was nested above.
2614                  */
2615                 if (th->t_refcount > old_ref) {
2616                         if (old_ref)
2617                                 th->t_refcount--;
2618                         else {
2619                                 int err;
2620                                 reiserfs_write_lock(inode->i_sb);
2621                                 err = reiserfs_end_persistent_transaction(th);
2622                                 reiserfs_write_unlock(inode->i_sb);
2623                                 if (err)
2624                                         ret = err;
2625                         }
2626                 }
2627         }
2628         return ret;
2629
2630 }
2631
2632 static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2633 {
2634         return generic_block_bmap(as, block, reiserfs_bmap);
2635 }
2636
2637 static int reiserfs_commit_write(struct file *f, struct page *page,
2638                                  unsigned from, unsigned to)
2639 {
2640         struct inode *inode = page->mapping->host;
2641         loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2642         int ret = 0;
2643         int update_sd = 0;
2644         struct reiserfs_transaction_handle *th = NULL;
2645
2646         reiserfs_wait_on_write_block(inode->i_sb);
2647         if (reiserfs_transaction_running(inode->i_sb)) {
2648                 th = current->journal_info;
2649         }
2650         reiserfs_commit_page(inode, page, from, to);
2651
2652         /* generic_commit_write does this for us, but does not update the
2653          ** transaction tracking stuff when the size changes.  So, we have
2654          ** to do the i_size updates here.
2655          */
2656         if (pos > inode->i_size) {
2657                 struct reiserfs_transaction_handle myth;
2658                 reiserfs_write_lock(inode->i_sb);
2659                 /* If the file have grown beyond the border where it
2660                    can have a tail, unmark it as needing a tail
2661                    packing */
2662                 if ((have_large_tails(inode->i_sb)
2663                      && inode->i_size > i_block_size(inode) * 4)
2664                     || (have_small_tails(inode->i_sb)
2665                         && inode->i_size > i_block_size(inode)))
2666                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2667
2668                 ret = journal_begin(&myth, inode->i_sb, 1);
2669                 if (ret) {
2670                         reiserfs_write_unlock(inode->i_sb);
2671                         goto journal_error;
2672                 }
2673                 reiserfs_update_inode_transaction(inode);
2674                 inode->i_size = pos;
2675                 /*
2676                  * this will just nest into our transaction.  It's important
2677                  * to use mark_inode_dirty so the inode gets pushed around on the
2678                  * dirty lists, and so that O_SYNC works as expected
2679                  */
2680                 mark_inode_dirty(inode);
2681                 reiserfs_update_sd(&myth, inode);
2682                 update_sd = 1;
2683                 ret = journal_end(&myth, inode->i_sb, 1);
2684                 reiserfs_write_unlock(inode->i_sb);
2685                 if (ret)
2686                         goto journal_error;
2687         }
2688         if (th) {
2689                 reiserfs_write_lock(inode->i_sb);
2690                 if (!update_sd)
2691                         mark_inode_dirty(inode);
2692                 ret = reiserfs_end_persistent_transaction(th);
2693                 reiserfs_write_unlock(inode->i_sb);
2694                 if (ret)
2695                         goto out;
2696         }
2697
2698       out:
2699         return ret;
2700
2701       journal_error:
2702         if (th) {
2703                 reiserfs_write_lock(inode->i_sb);
2704                 if (!update_sd)
2705                         reiserfs_update_sd(th, inode);
2706                 ret = reiserfs_end_persistent_transaction(th);
2707                 reiserfs_write_unlock(inode->i_sb);
2708         }
2709
2710         return ret;
2711 }
2712
2713 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2714 {
2715         if (reiserfs_attrs(inode->i_sb)) {
2716                 if (sd_attrs & REISERFS_SYNC_FL)
2717                         inode->i_flags |= S_SYNC;
2718                 else
2719                         inode->i_flags &= ~S_SYNC;
2720                 if (sd_attrs & REISERFS_IMMUTABLE_FL)
2721                         inode->i_flags |= S_IMMUTABLE;
2722                 else
2723                         inode->i_flags &= ~S_IMMUTABLE;
2724                 if (sd_attrs & REISERFS_IUNLINK_FL)
2725                         inode->i_flags |= S_IUNLINK;
2726                 else
2727                         inode->i_flags &= ~S_IUNLINK;
2728                 if (sd_attrs & REISERFS_BARRIER_FL)
2729                         inode->i_flags |= S_BARRIER;
2730                 else
2731                         inode->i_flags &= ~S_BARRIER;
2732                 if (sd_attrs & REISERFS_APPEND_FL)
2733                         inode->i_flags |= S_APPEND;
2734                 else
2735                         inode->i_flags &= ~S_APPEND;
2736                 if (sd_attrs & REISERFS_NOATIME_FL)
2737                         inode->i_flags |= S_NOATIME;
2738                 else
2739                         inode->i_flags &= ~S_NOATIME;
2740                 if (sd_attrs & REISERFS_NOTAIL_FL)
2741                         REISERFS_I(inode)->i_flags |= i_nopack_mask;
2742                 else
2743                         REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2744         }
2745 }
2746
2747 void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
2748 {
2749         if (reiserfs_attrs(inode->i_sb)) {
2750                 if (inode->i_flags & S_IMMUTABLE)
2751                         *sd_attrs |= REISERFS_IMMUTABLE_FL;
2752                 else
2753                         *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
2754                 if (inode->i_flags & S_IUNLINK)
2755                         *sd_attrs |= REISERFS_IUNLINK_FL;
2756                 else
2757                         *sd_attrs &= ~REISERFS_IUNLINK_FL;
2758                 if (inode->i_flags & S_BARRIER)
2759                         *sd_attrs |= REISERFS_BARRIER_FL;
2760                 else
2761                         *sd_attrs &= ~REISERFS_BARRIER_FL;
2762                 if (inode->i_flags & S_SYNC)
2763                         *sd_attrs |= REISERFS_SYNC_FL;
2764                 else
2765                         *sd_attrs &= ~REISERFS_SYNC_FL;
2766                 if (inode->i_flags & S_NOATIME)
2767                         *sd_attrs |= REISERFS_NOATIME_FL;
2768                 else
2769                         *sd_attrs &= ~REISERFS_NOATIME_FL;
2770                 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
2771                         *sd_attrs |= REISERFS_NOTAIL_FL;
2772                 else
2773                         *sd_attrs &= ~REISERFS_NOTAIL_FL;
2774         }
2775 }
2776
2777 /* decide if this buffer needs to stay around for data logging or ordered
2778 ** write purposes
2779 */
2780 static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2781 {
2782         int ret = 1;
2783         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
2784
2785         lock_buffer(bh);
2786         spin_lock(&j->j_dirty_buffers_lock);
2787         if (!buffer_mapped(bh)) {
2788                 goto free_jh;
2789         }
2790         /* the page is locked, and the only places that log a data buffer
2791          * also lock the page.
2792          */
2793         if (reiserfs_file_data_log(inode)) {
2794                 /*
2795                  * very conservative, leave the buffer pinned if
2796                  * anyone might need it.
2797                  */
2798                 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2799                         ret = 0;
2800                 }
2801         } else  if (buffer_dirty(bh)) {
2802                 struct reiserfs_journal_list *jl;
2803                 struct reiserfs_jh *jh = bh->b_private;
2804
2805                 /* why is this safe?
2806                  * reiserfs_setattr updates i_size in the on disk
2807                  * stat data before allowing vmtruncate to be called.
2808                  *
2809                  * If buffer was put onto the ordered list for this
2810                  * transaction, we know for sure either this transaction
2811                  * or an older one already has updated i_size on disk,
2812                  * and this ordered data won't be referenced in the file
2813                  * if we crash.
2814                  *
2815                  * if the buffer was put onto the ordered list for an older
2816                  * transaction, we need to leave it around
2817                  */
2818                 if (jh && (jl = jh->jl)
2819                     && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2820                         ret = 0;
2821         }
2822       free_jh:
2823         if (ret && bh->b_private) {
2824                 reiserfs_free_jh(bh);
2825         }
2826         spin_unlock(&j->j_dirty_buffers_lock);
2827         unlock_buffer(bh);
2828         return ret;
2829 }
2830
2831 /* clm -- taken from fs/buffer.c:block_invalidate_page */
2832 static int reiserfs_invalidatepage(struct page *page, unsigned long offset)
2833 {
2834         struct buffer_head *head, *bh, *next;
2835         struct inode *inode = page->mapping->host;
2836         unsigned int curr_off = 0;
2837         int ret = 1;
2838
2839         BUG_ON(!PageLocked(page));
2840
2841         if (offset == 0)
2842                 ClearPageChecked(page);
2843
2844         if (!page_has_buffers(page))
2845                 goto out;
2846
2847         head = page_buffers(page);
2848         bh = head;
2849         do {
2850                 unsigned int next_off = curr_off + bh->b_size;
2851                 next = bh->b_this_page;
2852
2853                 /*
2854                  * is this block fully invalidated?
2855                  */
2856                 if (offset <= curr_off) {
2857                         if (invalidatepage_can_drop(inode, bh))
2858                                 reiserfs_unmap_buffer(bh);
2859                         else
2860                                 ret = 0;
2861                 }
2862                 curr_off = next_off;
2863                 bh = next;
2864         } while (bh != head);
2865
2866         /*
2867          * We release buffers only if the entire page is being invalidated.
2868          * The get_block cached value has been unconditionally invalidated,
2869          * so real IO is not possible anymore.
2870          */
2871         if (!offset && ret)
2872                 ret = try_to_release_page(page, 0);
2873       out:
2874         return ret;
2875 }
2876
2877 static int reiserfs_set_page_dirty(struct page *page)
2878 {
2879         struct inode *inode = page->mapping->host;
2880         if (reiserfs_file_data_log(inode)) {
2881                 SetPageChecked(page);
2882                 return __set_page_dirty_nobuffers(page);
2883         }
2884         return __set_page_dirty_buffers(page);
2885 }
2886
2887 /*
2888  * Returns 1 if the page's buffers were dropped.  The page is locked.
2889  *
2890  * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
2891  * in the buffers at page_buffers(page).
2892  *
2893  * even in -o notail mode, we can't be sure an old mount without -o notail
2894  * didn't create files with tails.
2895  */
2896 static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
2897 {
2898         struct inode *inode = page->mapping->host;
2899         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
2900         struct buffer_head *head;
2901         struct buffer_head *bh;
2902         int ret = 1;
2903
2904         WARN_ON(PageChecked(page));
2905         spin_lock(&j->j_dirty_buffers_lock);
2906         head = page_buffers(page);
2907         bh = head;
2908         do {
2909                 if (bh->b_private) {
2910                         if (!buffer_dirty(bh) && !buffer_locked(bh)) {
2911                                 reiserfs_free_jh(bh);
2912                         } else {
2913                                 ret = 0;
2914                                 break;
2915                         }
2916                 }
2917                 bh = bh->b_this_page;
2918         } while (bh != head);
2919         if (ret)
2920                 ret = try_to_free_buffers(page);
2921         spin_unlock(&j->j_dirty_buffers_lock);
2922         return ret;
2923 }
2924
2925 /* We thank Mingming Cao for helping us understand in great detail what
2926    to do in this section of the code. */
2927 static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
2928                                   const struct iovec *iov, loff_t offset,
2929                                   unsigned long nr_segs)
2930 {
2931         struct file *file = iocb->ki_filp;
2932         struct inode *inode = file->f_mapping->host;
2933
2934         return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2935                                   offset, nr_segs,
2936                                   reiserfs_get_blocks_direct_io, NULL);
2937 }
2938
2939 int reiserfs_sync_flags(struct inode *inode)
2940 {
2941         u16 oldflags, newflags;
2942
2943         oldflags = REISERFS_I(inode)->i_attrs;
2944         newflags = oldflags;
2945         i_attrs_to_sd_attrs(inode, &newflags);
2946
2947         if (oldflags ^ newflags) {
2948                 REISERFS_I(inode)->i_attrs = newflags;
2949                 inode->i_ctime = CURRENT_TIME_SEC;
2950                 mark_inode_dirty(inode);
2951         }
2952         return 0;
2953 }
2954
2955 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
2956 {
2957         struct inode *inode = dentry->d_inode;
2958         int error;
2959         unsigned int ia_valid = attr->ia_valid;
2960         reiserfs_write_lock(inode->i_sb);
2961         if (attr->ia_valid & ATTR_SIZE) {
2962                 /* version 2 items will be caught by the s_maxbytes check
2963                  ** done for us in vmtruncate
2964                  */
2965                 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
2966                     attr->ia_size > MAX_NON_LFS) {
2967                         error = -EFBIG;
2968                         goto out;
2969                 }
2970                 /* fill in hole pointers in the expanding truncate case. */
2971                 if (attr->ia_size > inode->i_size) {
2972                         error = generic_cont_expand(inode, attr->ia_size);
2973                         if (REISERFS_I(inode)->i_prealloc_count > 0) {
2974                                 int err;
2975                                 struct reiserfs_transaction_handle th;
2976                                 /* we're changing at most 2 bitmaps, inode + super */
2977                                 err = journal_begin(&th, inode->i_sb, 4);
2978                                 if (!err) {
2979                                         reiserfs_discard_prealloc(&th, inode);
2980                                         err = journal_end(&th, inode->i_sb, 4);
2981                                 }
2982                                 if (err)
2983                                         error = err;
2984                         }
2985                         if (error)
2986                                 goto out;
2987                 }
2988         }
2989
2990         if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
2991              ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
2992             (get_inode_sd_version(inode) == STAT_DATA_V1)) {
2993                 /* stat data of format v3.5 has 16 bit uid and gid */
2994                 error = -EINVAL;
2995                 goto out;
2996         }
2997
2998         error = inode_change_ok(inode, attr);
2999
3000         if (!error) {
3001                 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3002                     (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid) ||
3003                     (ia_valid & ATTR_XID && attr->ia_xid != inode->i_xid)) {
3004                         error = reiserfs_chown_xattrs(inode, attr);
3005
3006                         if (!error) {
3007                                 struct reiserfs_transaction_handle th;
3008                                 int jbegin_count =
3009                                     2 *
3010                                     (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3011                                      REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3012                                     2;
3013
3014                                 /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3015                                 error =
3016                                     journal_begin(&th, inode->i_sb,
3017                                                   jbegin_count);
3018                                 if (error)
3019                                         goto out;
3020                                 error =
3021                                     DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
3022                                 if (error) {
3023                                         journal_end(&th, inode->i_sb,
3024                                                     jbegin_count);
3025                                         goto out;
3026                                 }
3027                                 /* Update corresponding info in inode so that everything is in
3028                                  * one transaction */
3029                                 if (attr->ia_valid & ATTR_UID)
3030                                         inode->i_uid = attr->ia_uid;
3031                                 if (attr->ia_valid & ATTR_GID)
3032                                         inode->i_gid = attr->ia_gid;
3033                                 if ((attr->ia_valid & ATTR_XID) &&
3034                                         IS_TAGXID(inode))
3035                                         inode->i_xid = attr->ia_xid;
3036                                 mark_inode_dirty(inode);
3037                                 error =
3038                                     journal_end(&th, inode->i_sb, jbegin_count);
3039                         }
3040                 }
3041                 if (!error)
3042                         error = inode_setattr(inode, attr);
3043         }
3044
3045         if (!error && reiserfs_posixacl(inode->i_sb)) {
3046                 if (attr->ia_valid & ATTR_MODE)
3047                         error = reiserfs_acl_chmod(inode);
3048         }
3049
3050       out:
3051         reiserfs_write_unlock(inode->i_sb);
3052         return error;
3053 }
3054
3055 struct address_space_operations reiserfs_address_space_operations = {
3056         .writepage = reiserfs_writepage,
3057         .readpage = reiserfs_readpage,
3058         .readpages = reiserfs_readpages,
3059         .releasepage = reiserfs_releasepage,
3060         .invalidatepage = reiserfs_invalidatepage,
3061         .sync_page = block_sync_page,
3062         .prepare_write = reiserfs_prepare_write,
3063         .commit_write = reiserfs_commit_write,
3064         .bmap = reiserfs_aop_bmap,
3065         .direct_IO = reiserfs_direct_IO,
3066         .set_page_dirty = reiserfs_set_page_dirty,
3067 };