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Its useful to iterate on all the active tags in cases where we will need to fail all the queues IO. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> [hch: carefully check for valid tagsets] Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@fb.com>