xfs_db: dump metadata btrees via 'btdump'

Introduce a new 'btdump' command that can print the contents of all
blocks of any metadata subtree in the filesystem.  This enables
developers and forensic analyst to view a metadata structure without
having to navigate the btree manually.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

5 files changed