dm raid: fix oops on upgrading to extended superblock format
When a RAID set was created on dm-raid version < 1.9.0 (old RAID superblock format), all of the new 1.9.0 members of the superblock are uninitialized (zero) -- including the device sectors member needed to support shrinking. All the other accesses to superblock fields new in 1.9.0 were reviewed and verified to be properly guarded against invalid use. The 'sectors' member was the only one used when the superblock version is < 1.9. Don't access the superblock's >= 1.9.0 'sectors' member unconditionally. Also add respective comments. Signed-off-by:Heinz Mauelshagen <heinzm@redhat.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com>
parent
feb7695f
Please register or sign in to comment