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    xfs: add CRC checks to the AGF · 4e0e6040
    Dave Chinner 提交于
    The AGF already has some self identifying fields (e.g. the sequence
    number) so we only need to add the uuid to it to identify the
    filesystem it belongs to. The location is fixed based on the
    sequence number, so there's no need to add a block number, either.
    
    Hence the only additional fields are the CRC and LSN fields. These
    are unlogged, so place some space between the end of the logged
    fields and them so that future expansion of the AGF for logged
    fields can be placed adjacent to the existing logged fields and
    hence not complicate the field-derived range based logging we
    currently have.
    
    Based originally on a patch from myself, modified further by
    Christoph Hellwig and then modified again to fit into the
    verifier structure with additional fields by myself. The multiple
    signed-off-by tags indicate the age and history of this patch.
    Signed-off-by: NDave Chinner <dgc@sgi.com>
    Signed-off-by: NChristoph Hellwig <hch@lst.de>
    Signed-off-by: NDave Chinner <dchinner@redhat.com>
    Reviewed-by: NBen Myers <bpm@sgi.com>
    Signed-off-by: NBen Myers <bpm@sgi.com>
    4e0e6040
xfs_fsops.c 21.9 KB