btrfs: check if the device is flush capable
The block layer call chain from submit_bio will check if the write cache is enabled for the given queue before submitting the flush. This will add a code to fail fast if its not. Signed-off-by: NAnand Jain <anand.jain@oracle.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> [ updated changelog to reflect current code stat, blkdev_issue_flush is not used yet ] Signed-off-by: NDavid Sterba <dsterba@suse.com>
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