• Shaohua Li's avatar
    blk-mq: add tag allocation policy · 24391c0d
    Shaohua Li authored
    This is the blk-mq part to support tag allocation policy. The default
    allocation policy isn't changed (though it's not a strict FIFO). The new
    policy is round-robin for libata. But it's a try-best implementation. If
    multiple tasks are competing, the tags returned will be mixed (which is
    unavoidable even with !mq, as requests from different tasks can be
    mixed in queue)
    Cc: Jens Axboe <axboe@fb.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Christoph Hellwig <hch@infradead.org>
    Signed-off-by: default avatarShaohua Li <shli@fb.com>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
blk-mq-tag.h 2.14 KB