From: Dave Chinner <dchinner@redhat.com>
Date: Wed, 19 Aug 2015 00:31:54 +0000 (+1000)
Subject: xfs: log recovery needs to validate against sb_meta_uuid
X-Git-Tag: omap-for-v4.3/fixes-rc1~79^2~2^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcfbe2c4ef4243cc11a1cd64ee1b4907b6afea06;p=pandora-kernel.git

xfs: log recovery needs to validate against sb_meta_uuid

Now that sb_uuid can be changed by the user, we cannot use this to
validate the metadata blocks being recovered belong to this
filesystem. We must check against the sb_meta_uuid as that will
remain unchanged.

There is a complication in this code - the superblock itself. We can
not check the sb_meta_uuid unconditionally, as that may not be set
on disk. Hence we must verify the superblock sb_uuid matches between
the log record and the in-core superblock.

Found by inspection after the previous two problems were found.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
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