ocfs2: Fix up i_blocks calculation to know about holes

Older file systems which didn't support holes did a dumb calculation of
i_blocks based on i_size. This is no longer accurate, so fix things up to
take actual allocation into account.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index ff71e0b..b74971e 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1271,7 +1271,7 @@
 		i_size_write(inode, pos);
 		mark_inode_dirty(inode);
 	}
-	inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
+	inode->i_blocks = ocfs2_inode_sector_count(inode);
 	di->i_size = cpu_to_le64((u64)i_size_read(inode));
 	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);