block/blklogwrites: Add an option for the update interval of the log superblock
This is a way to ensure that the log superblock is periodically updated. Before, this was only done on flush requests, which may not be enough if the VM exits abnormally, omitting the final flush. The default interval is 4096 write requests. Signed-off-by: NAri Sundholm <ari@tuxera.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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