[XFS updates] XFS development tree branch, master, updated. v3.10-rc1-32-g9222a9c

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  9222a9c xfs: don't shutdown log recovery on validation errors
      from  ade1335afef556df6538eb02e8c0dc91fbd9cc37 (commit)

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- Log -----------------------------------------------------------------
commit 9222a9cf86c0d64ffbedf567412b55da18763aa3
Author: Dave Chinner <dchinner@redhat.com>
Date:   Wed Jun 12 12:19:06 2013 +1000

    xfs: don't shutdown log recovery on validation errors
    
    Unfortunately, we cannot guarantee that items logged multiple times
    and replayed by log recovery do not take objects back in time. When
    they are taken back in time, the go into an intermediate state which
    is corrupt, and hence verification that occurs on this intermediate
    state causes log recovery to abort with a corruption shutdown.
    
    Instead of causing a shutdown and unmountable filesystem, don't
    verify post-recovery items before they are written to disk. This is
    less than optimal, but there is no way to detect this issue for
    non-CRC filesystems If log recovery successfully completes, this
    will be undone and the object will be consistent by subsequent
    transactions that are replayed, so in most cases we don't need to
    take drastic action.
    
    For CRC enabled filesystems, leave the verifiers in place - we need
    to call them to recalculate the CRCs on the objects anyway. This
    recovery problem can be solved for such filesystems - we have a LSN
    stamped in all metadata at writeback time that we can to determine
    whether the item should be replayed or not. This is a separate piece
    of work, so is not addressed by this patch.
    
    Signed-off-by: Dave Chinner <dchinner@redhat.com>
    Reviewed-by: Ben Myers <bpm@sgi.com>
    Signed-off-by: Ben Myers <bpm@sgi.com>

-----------------------------------------------------------------------

Summary of changes:
 fs/xfs/xfs_log_recover.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)


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