btrfs: Add checker for EXTENT_CSUM
commit 4b865cab upstream. EXTENT_CSUM checker is a relatively easy one, only needs to check: 1) Objectid Fixed to BTRFS_EXTENT_CSUM_OBJECTID 2) Key offset alignment Must be aligned to sectorsize 3) Item size alignedment Must be aligned to csum size Signed-off-by: Qu Wenruo <quwenruo.btrfs@gmx.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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