+#ifdef NTFS_RW
+
+/**
+ * ntfs_dir_fsync - sync a directory to disk
+ * @filp: directory to be synced
+ * @dentry: dentry describing the directory to sync
+ * @datasync: if non-zero only flush user data and not metadata
+ *
+ * Data integrity sync of a directory to disk. Used for fsync, fdatasync, and
+ * msync system calls. This function is based on file.c::ntfs_file_fsync().
+ *
+ * Write the mft record and all associated extent mft records as well as the
+ * $INDEX_ALLOCATION and $BITMAP attributes and then sync the block device.
+ *
+ * If @datasync is true, we do not wait on the inode(s) to be written out
+ * but we always wait on the page cache pages to be written out.
+ *
+ * Note: In the past @filp could be NULL so we ignore it as we don't need it
+ * anyway.
+ *
+ * Locking: Caller must hold i_sem on the inode.
+ *
+ * TODO: We should probably also write all attribute/index inodes associated
+ * with this inode but since we have no simple way of getting to them we ignore
+ * this problem for now. We do write the $BITMAP attribute if it is present
+ * which is the important one for a directory so things are not too bad.
+ */
+static int ntfs_dir_fsync(struct file *filp, struct dentry *dentry,
+ int datasync)
+{
+ struct inode *vi = dentry->d_inode;
+ ntfs_inode *ni = NTFS_I(vi);
+ int err, ret;
+
+ ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
+ BUG_ON(!S_ISDIR(vi->i_mode));
+ if (NInoIndexAllocPresent(ni) && ni->itype.index.bmp_ino)
+ write_inode_now(ni->itype.index.bmp_ino, !datasync);
+ ret = ntfs_write_inode(vi, 1);
+ write_inode_now(vi, !datasync);
+ err = sync_blockdev(vi->i_sb->s_bdev);
+ if (unlikely(err && !ret))
+ ret = err;
+ if (likely(!ret))
+ ntfs_debug("Done.");
+ else
+ ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx. Error "
+ "%u.", datasync ? "data" : "", vi->i_ino, -ret);
+ return ret;
+}
+
+#endif /* NTFS_RW */
+