ocfs2: Convenient access to an xattr bucket's block number.
The xattr code often wants to know the block number of an xattr bucket. This is usually found by dereferencing the first bh hanging off of the ocfs2_xattr_bucket structure. Rather than do this all the time, let's provide a nice little macro. The idea is ripped from the ocfs2_path code. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
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