fs/ocfs2/aops.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public
  17  * License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA.
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/slab.h>
  24 #include <linux/highmem.h>
  25 #include <linux/pagemap.h>
  26 #include <asm/byteorder.h>
  27
  28 #define MLOG_MASK_PREFIX ML_FILE_IO
  29 #include <cluster/masklog.h>
  30
  31 #include "ocfs2.h"
  32
  33 #include "alloc.h"
  34 #include "aops.h"
  35 #include "dlmglue.h"
  36 #include "extent_map.h"
  37 #include "file.h"
  38 #include "inode.h"
  39 #include "journal.h"
  40 #include "super.h"
  41 #include "symlink.h"
  42
  43 #include "buffer_head_io.h"
  44
  45 static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
  46                                    struct buffer_head *bh_result, int create)
  47 {
  48         int err = -EIO;
  49         int status;
  50         struct ocfs2_dinode *fe = NULL;
  51         struct buffer_head *bh = NULL;
  52         struct buffer_head *buffer_cache_bh = NULL;
  53         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  54         void *kaddr;
  55
  56         mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
  57                    (unsigned long long)iblock, bh_result, create);
  58
  59         BUG_ON(ocfs2_inode_is_fast_symlink(inode));
  60
  61         if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
  62                 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
  63                      (unsigned long long)iblock);
  64                 goto bail;
  65         }
  66
  67         status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
  68                                   OCFS2_I(inode)->ip_blkno,
  69                                   &bh, OCFS2_BH_CACHED, inode);
  70         if (status < 0) {
  71                 mlog_errno(status);
  72                 goto bail;
  73         }
  74         fe = (struct ocfs2_dinode *) bh->b_data;
  75
  76         if (!OCFS2_IS_VALID_DINODE(fe)) {
  77                 mlog(ML_ERROR, "Invalid dinode #%"MLFu64": signature = %.*s\n",
  78                      fe->i_blkno, 7, fe->i_signature);
  79                 goto bail;
  80         }
  81
  82         if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
  83                                                     le32_to_cpu(fe->i_clusters))) {
  84                 mlog(ML_ERROR, "block offset is outside the allocated size: "
  85                      "%llu\n", (unsigned long long)iblock);
  86                 goto bail;
  87         }
  88
  89         /* We don't use the page cache to create symlink data, so if
  90          * need be, copy it over from the buffer cache. */
  91         if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
  92                 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
  93                             iblock;
  94                 buffer_cache_bh = sb_getblk(osb->sb, blkno);
  95                 if (!buffer_cache_bh) {
  96                         mlog(ML_ERROR, "couldn't getblock for symlink!\n");
  97                         goto bail;
  98                 }
  99
 100                 /* we haven't locked out transactions, so a commit
 101                  * could've happened. Since we've got a reference on
 102                  * the bh, even if it commits while we're doing the
 103                  * copy, the data is still good. */
 104                 if (buffer_jbd(buffer_cache_bh)
 105                     && ocfs2_inode_is_new(inode)) {
 106                         kaddr = kmap_atomic(bh_result->b_page, KM_USER0);
 107                         if (!kaddr) {
 108                                 mlog(ML_ERROR, "couldn't kmap!\n");
 109                                 goto bail;
 110                         }
 111                         memcpy(kaddr + (bh_result->b_size * iblock),
 112                                buffer_cache_bh->b_data,
 113                                bh_result->b_size);
 114                         kunmap_atomic(kaddr, KM_USER0);
 115                         set_buffer_uptodate(bh_result);
 116                 }
 117                 brelse(buffer_cache_bh);
 118         }
 119
 120         map_bh(bh_result, inode->i_sb,
 121                le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
 122
 123         err = 0;
 124
 125 bail:
 126         if (bh)
 127                 brelse(bh);
 128
 129         mlog_exit(err);
 130         return err;
 131 }
 132
 133 static int ocfs2_get_block(struct inode *inode, sector_t iblock,
 134                            struct buffer_head *bh_result, int create)
 135 {
 136         int err = 0;
 137         u64 p_blkno, past_eof;
 138
 139         mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
 140                    (unsigned long long)iblock, bh_result, create);
 141
 142         if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
 143                 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
 144                      inode, inode->i_ino);
 145
 146         if (S_ISLNK(inode->i_mode)) {
 147                 /* this always does I/O for some reason. */
 148                 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
 149                 goto bail;
 150         }
 151
 152         /* this can happen if another node truncs after our extend! */
 153         spin_lock(&OCFS2_I(inode)->ip_lock);
 154         if (iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
 155                                                OCFS2_I(inode)->ip_clusters))
 156                 err = -EIO;
 157         spin_unlock(&OCFS2_I(inode)->ip_lock);
 158         if (err)
 159                 goto bail;
 160
 161         err = ocfs2_extent_map_get_blocks(inode, iblock, 1, &p_blkno,
 162                                           NULL);
 163         if (err) {
 164                 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
 165                      "%"MLFu64", NULL)\n", err, inode,
 166                      (unsigned long long)iblock, p_blkno);
 167                 goto bail;
 168         }
 169
 170         map_bh(bh_result, inode->i_sb, p_blkno);
 171
 172         if (bh_result->b_blocknr == 0) {
 173                 err = -EIO;
 174                 mlog(ML_ERROR, "iblock = %llu p_blkno = %"MLFu64" "
 175                      "blkno=(%"MLFu64")\n", (unsigned long long)iblock,
 176                      p_blkno, OCFS2_I(inode)->ip_blkno);
 177         }
 178
 179         past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
 180         mlog(0, "Inode %lu, past_eof = %"MLFu64"\n", inode->i_ino, past_eof);
 181
 182         if (create && (iblock >= past_eof))
 183                 set_buffer_new(bh_result);
 184
 185 bail:
 186         if (err < 0)
 187                 err = -EIO;
 188
 189         mlog_exit(err);
 190         return err;
 191 }
 192
 193 static int ocfs2_readpage(struct file *file, struct page *page)
 194 {
 195         struct inode *inode = page->mapping->host;
 196         loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
 197         int ret, unlock = 1;
 198
 199         mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));
 200
 201         ret = ocfs2_meta_lock_with_page(inode, NULL, NULL, 0, page);
 202         if (ret != 0) {
 203                 if (ret == AOP_TRUNCATED_PAGE)
 204                         unlock = 0;
 205                 mlog_errno(ret);
 206                 goto out;
 207         }
 208
 209         down_read(&OCFS2_I(inode)->ip_alloc_sem);
 210
 211         /*
 212          * i_size might have just been updated as we grabed the meta lock.  We
 213          * might now be discovering a truncate that hit on another node.
 214          * block_read_full_page->get_block freaks out if it is asked to read
 215          * beyond the end of a file, so we check here.  Callers
 216          * (generic_file_read, fault->nopage) are clever enough to check i_size
 217          * and notice that the page they just read isn't needed.
 218          *
 219          * XXX sys_readahead() seems to get that wrong?
 220          */
 221         if (start >= i_size_read(inode)) {
 222                 char *addr = kmap(page);
 223                 memset(addr, 0, PAGE_SIZE);
 224                 flush_dcache_page(page);
 225                 kunmap(page);
 226                 SetPageUptodate(page);
 227                 ret = 0;
 228                 goto out_alloc;
 229         }
 230
 231         ret = ocfs2_data_lock_with_page(inode, 0, page);
 232         if (ret != 0) {
 233                 if (ret == AOP_TRUNCATED_PAGE)
 234                         unlock = 0;
 235                 mlog_errno(ret);
 236                 goto out_alloc;
 237         }
 238
 239         ret = block_read_full_page(page, ocfs2_get_block);
 240         unlock = 0;
 241
 242         ocfs2_data_unlock(inode, 0);
 243 out_alloc:
 244         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 245         ocfs2_meta_unlock(inode, 0);
 246 out:
 247         if (unlock)
 248                 unlock_page(page);
 249         mlog_exit(ret);
 250         return ret;
 251 }
 252
 253 /* Note: Because we don't support holes, our allocation has
 254  * already happened (allocation writes zeros to the file data)
 255  * so we don't have to worry about ordered writes in
 256  * ocfs2_writepage.
 257  *
 258  * ->writepage is called during the process of invalidating the page cache
 259  * during blocked lock processing.  It can't block on any cluster locks
 260  * to during block mapping.  It's relying on the fact that the block
 261  * mapping can't have disappeared under the dirty pages that it is
 262  * being asked to write back.
 263  */
 264 static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
 265 {
 266         int ret;
 267
 268         mlog_entry("(0x%p)\n", page);
 269
 270         ret = block_write_full_page(page, ocfs2_get_block, wbc);
 271
 272         mlog_exit(ret);
 273
 274         return ret;
 275 }
 276
 277 /*
 278  * ocfs2_prepare_write() can be an outer-most ocfs2 call when it is called
 279  * from loopback.  It must be able to perform its own locking around
 280  * ocfs2_get_block().
 281  */
 282 int ocfs2_prepare_write(struct file *file, struct page *page,
 283                         unsigned from, unsigned to)
 284 {
 285         struct inode *inode = page->mapping->host;
 286         int ret;
 287
 288         mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
 289
 290         ret = ocfs2_meta_lock_with_page(inode, NULL, NULL, 0, page);
 291         if (ret != 0) {
 292                 mlog_errno(ret);
 293                 goto out;
 294         }
 295
 296         down_read(&OCFS2_I(inode)->ip_alloc_sem);
 297
 298         ret = block_prepare_write(page, from, to, ocfs2_get_block);
 299
 300         up_read(&OCFS2_I(inode)->ip_alloc_sem);
 301
 302         ocfs2_meta_unlock(inode, 0);
 303 out:
 304         mlog_exit(ret);
 305         return ret;
 306 }
 307
 308 /* Taken from ext3. We don't necessarily need the full blown
 309  * functionality yet, but IMHO it's better to cut and paste the whole
 310  * thing so we can avoid introducing our own bugs (and easily pick up
 311  * their fixes when they happen) --Mark */
 312 static int walk_page_buffers(   handle_t *handle,
 313                                 struct buffer_head *head,
 314                                 unsigned from,
 315                                 unsigned to,
 316                                 int *partial,
 317                                 int (*fn)(      handle_t *handle,
 318                                                 struct buffer_head *bh))
 319 {
 320         struct buffer_head *bh;
 321         unsigned block_start, block_end;
 322         unsigned blocksize = head->b_size;
 323         int err, ret = 0;
 324         struct buffer_head *next;
 325
 326         for (   bh = head, block_start = 0;
 327                 ret == 0 && (bh != head || !block_start);
 328                 block_start = block_end, bh = next)
 329         {
 330                 next = bh->b_this_page;
 331                 block_end = block_start + blocksize;
 332                 if (block_end <= from || block_start >= to) {
 333                         if (partial && !buffer_uptodate(bh))
 334                                 *partial = 1;
 335                         continue;
 336                 }
 337                 err = (*fn)(handle, bh);
 338                 if (!ret)
 339                         ret = err;
 340         }
 341         return ret;
 342 }
 343
 344 struct ocfs2_journal_handle *ocfs2_start_walk_page_trans(struct inode *inode,
 345                                                          struct page *page,
 346                                                          unsigned from,
 347                                                          unsigned to)
 348 {
 349         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 350         struct ocfs2_journal_handle *handle = NULL;
 351         int ret = 0;
 352
 353         handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
 354         if (!handle) {
 355                 ret = -ENOMEM;
 356                 mlog_errno(ret);
 357                 goto out;
 358         }
 359
 360         if (ocfs2_should_order_data(inode)) {
 361                 ret = walk_page_buffers(handle->k_handle,
 362                                         page_buffers(page),
 363                                         from, to, NULL,
 364                                         ocfs2_journal_dirty_data);
 365                 if (ret < 0)
 366                         mlog_errno(ret);
 367         }
 368 out:
 369         if (ret) {
 370                 if (handle)
 371                         ocfs2_commit_trans(handle);
 372                 handle = ERR_PTR(ret);
 373         }
 374         return handle;
 375 }
 376
 377 static int ocfs2_commit_write(struct file *file, struct page *page,
 378                               unsigned from, unsigned to)
 379 {
 380         int ret, extending = 0, locklevel = 0;
 381         loff_t new_i_size;
 382         struct buffer_head *di_bh = NULL;
 383         struct inode *inode = page->mapping->host;
 384         struct ocfs2_journal_handle *handle = NULL;
 385
 386         mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
 387
 388         /* NOTE: ocfs2_file_aio_write has ensured that it's safe for
 389          * us to sample inode->i_size here without the metadata lock:
 390          *
 391          * 1) We're currently holding the inode alloc lock, so no
 392          *    nodes can change it underneath us.
 393          *
 394          * 2) We've had to take the metadata lock at least once
 395          *    already to check for extending writes, hence insuring
 396          *    that our current copy is also up to date.
 397          */
 398         new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
 399         if (new_i_size > i_size_read(inode)) {
 400                 extending = 1;
 401                 locklevel = 1;
 402         }
 403
 404         ret = ocfs2_meta_lock_with_page(inode, NULL, &di_bh, locklevel, page);
 405         if (ret != 0) {
 406                 mlog_errno(ret);
 407                 goto out;
 408         }
 409
 410         ret = ocfs2_data_lock_with_page(inode, 1, page);
 411         if (ret != 0) {
 412                 mlog_errno(ret);
 413                 goto out_unlock_meta;
 414         }
 415
 416         if (extending) {
 417                 handle = ocfs2_start_walk_page_trans(inode, page, from, to);
 418                 if (IS_ERR(handle)) {
 419                         ret = PTR_ERR(handle);
 420                         handle = NULL;
 421                         goto out_unlock_data;
 422                 }
 423
 424                 /* Mark our buffer early. We'd rather catch this error up here
 425                  * as opposed to after a successful commit_write which would
 426                  * require us to set back inode->i_size. */
 427                 ret = ocfs2_journal_access(handle, inode, di_bh,
 428                                            OCFS2_JOURNAL_ACCESS_WRITE);
 429                 if (ret < 0) {
 430                         mlog_errno(ret);
 431                         goto out_commit;
 432                 }
 433         }
 434
 435         /* might update i_size */
 436         ret = generic_commit_write(file, page, from, to);
 437         if (ret < 0) {
 438                 mlog_errno(ret);
 439                 goto out_commit;
 440         }
 441
 442         if (extending) {
 443                 loff_t size = (u64) i_size_read(inode);
 444                 struct ocfs2_dinode *di =
 445                         (struct ocfs2_dinode *)di_bh->b_data;
 446
 447                 /* ocfs2_mark_inode_dirty is too heavy to use here. */
 448                 inode->i_blocks = ocfs2_align_bytes_to_sectors(size);
 449                 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
 450
 451                 di->i_size = cpu_to_le64(size);
 452                 di->i_ctime = di->i_mtime =
 453                                 cpu_to_le64(inode->i_mtime.tv_sec);
 454                 di->i_ctime_nsec = di->i_mtime_nsec =
 455                                 cpu_to_le32(inode->i_mtime.tv_nsec);
 456
 457                 ret = ocfs2_journal_dirty(handle, di_bh);
 458                 if (ret < 0) {
 459                         mlog_errno(ret);
 460                         goto out_commit;
 461                 }
 462         }
 463
 464         BUG_ON(extending && (i_size_read(inode) != new_i_size));
 465
 466 out_commit:
 467         if (handle)
 468                 ocfs2_commit_trans(handle);
 469 out_unlock_data:
 470         ocfs2_data_unlock(inode, 1);
 471 out_unlock_meta:
 472         ocfs2_meta_unlock(inode, locklevel);
 473 out:
 474         if (di_bh)
 475                 brelse(di_bh);
 476
 477         mlog_exit(ret);
 478         return ret;
 479 }
 480
 481 static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
 482 {
 483         sector_t status;
 484         u64 p_blkno = 0;
 485         int err = 0;
 486         struct inode *inode = mapping->host;
 487
 488         mlog_entry("(block = %llu)\n", (unsigned long long)block);
 489
 490         /* We don't need to lock journal system files, since they aren't
 491          * accessed concurrently from multiple nodes.
 492          */
 493         if (!INODE_JOURNAL(inode)) {
 494                 err = ocfs2_meta_lock(inode, NULL, NULL, 0);
 495                 if (err) {
 496                         if (err != -ENOENT)
 497                                 mlog_errno(err);
 498                         goto bail;
 499                 }
 500                 down_read(&OCFS2_I(inode)->ip_alloc_sem);
 501         }
 502
 503         err = ocfs2_extent_map_get_blocks(inode, block, 1, &p_blkno,
 504                                           NULL);
 505
 506         if (!INODE_JOURNAL(inode)) {
 507                 up_read(&OCFS2_I(inode)->ip_alloc_sem);
 508                 ocfs2_meta_unlock(inode, 0);
 509         }
 510
 511         if (err) {
 512                 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
 513                      (unsigned long long)block);
 514                 mlog_errno(err);
 515                 goto bail;
 516         }
 517
 518
 519 bail:
 520         status = err ? 0 : p_blkno;
 521
 522         mlog_exit((int)status);
 523
 524         return status;
 525 }
 526
 527 /*
 528  * TODO: Make this into a generic get_blocks function.
 529  *
 530  * From do_direct_io in direct-io.c:
 531  *  "So what we do is to permit the ->get_blocks function to populate
 532  *   bh.b_size with the size of IO which is permitted at this offset and
 533  *   this i_blkbits."
 534  *
 535  * This function is called directly from get_more_blocks in direct-io.c.
 536  *
 537  * called like this: dio->get_blocks(dio->inode, fs_startblk,
 538  *                                      fs_count, map_bh, dio->rw == WRITE);
 539  */
 540 static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
 541                                      unsigned long max_blocks,
 542                                      struct buffer_head *bh_result, int create)
 543 {
 544         int ret;
 545         u64 vbo_max; /* file offset, max_blocks from iblock */
 546         u64 p_blkno;
 547         int contig_blocks;
 548         unsigned char blocksize_bits;
 549
 550         if (!inode || !bh_result) {
 551                 mlog(ML_ERROR, "inode or bh_result is null\n");
 552                 return -EIO;
 553         }
 554
 555         blocksize_bits = inode->i_sb->s_blocksize_bits;
 556
 557         /* This function won't even be called if the request isn't all
 558          * nicely aligned and of the right size, so there's no need
 559          * for us to check any of that. */
 560
 561         vbo_max = ((u64)iblock + max_blocks) << blocksize_bits;
 562
 563         spin_lock(&OCFS2_I(inode)->ip_lock);
 564         if ((iblock + max_blocks) >
 565             ocfs2_clusters_to_blocks(inode->i_sb,
 566                                      OCFS2_I(inode)->ip_clusters)) {
 567                 spin_unlock(&OCFS2_I(inode)->ip_lock);
 568                 ret = -EIO;
 569                 goto bail;
 570         }
 571         spin_unlock(&OCFS2_I(inode)->ip_lock);
 572
 573         /* This figures out the size of the next contiguous block, and
 574          * our logical offset */
 575         ret = ocfs2_extent_map_get_blocks(inode, iblock, 1, &p_blkno,
 576                                           &contig_blocks);
 577         if (ret) {
 578                 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
 579                      (unsigned long long)iblock);
 580                 ret = -EIO;
 581                 goto bail;
 582         }
 583
 584         map_bh(bh_result, inode->i_sb, p_blkno);
 585
 586         /* make sure we don't map more than max_blocks blocks here as
 587            that's all the kernel will handle at this point. */
 588         if (max_blocks < contig_blocks)
 589                 contig_blocks = max_blocks;
 590         bh_result->b_size = contig_blocks << blocksize_bits;
 591 bail:
 592         return ret;
 593 }
 594
 595 /*
 596  * ocfs2_dio_end_io is called by the dio core when a dio is finished.  We're
 597  * particularly interested in the aio/dio case.  Like the core uses
 598  * i_alloc_sem, we use the rw_lock DLM lock to protect io on one node from
 599  * truncation on another.
 600  */
 601 static void ocfs2_dio_end_io(struct kiocb *iocb,
 602                              loff_t offset,
 603                              ssize_t bytes,
 604                              void *private)
 605 {
 606         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 607
 608         /* this io's submitter should not have unlocked this before we could */
 609         BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
 610         ocfs2_iocb_clear_rw_locked(iocb);
 611         up_read(&inode->i_alloc_sem);
 612         ocfs2_rw_unlock(inode, 0);
 613 }
 614
 615 static ssize_t ocfs2_direct_IO(int rw,
 616                                struct kiocb *iocb,
 617                                const struct iovec *iov,
 618                                loff_t offset,
 619                                unsigned long nr_segs)
 620 {
 621         struct file *file = iocb->ki_filp;
 622         struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
 623         int ret;
 624
 625         mlog_entry_void();
 626         ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
 627                                             inode->i_sb->s_bdev, iov, offset,
 628                                             nr_segs,
 629                                             ocfs2_direct_IO_get_blocks,
 630                                             ocfs2_dio_end_io);
 631         mlog_exit(ret);
 632         return ret;
 633 }
 634
 635 struct address_space_operations ocfs2_aops = {
 636         .readpage       = ocfs2_readpage,
 637         .writepage      = ocfs2_writepage,
 638         .prepare_write  = ocfs2_prepare_write,
 639         .commit_write   = ocfs2_commit_write,
 640         .bmap           = ocfs2_bmap,
 641         .sync_page      = block_sync_page,
 642         .direct_IO      = ocfs2_direct_IO
 643 };