tree 8863e8e297fd10241d7ff1e24cdef4ab0b7c625e
parent e548ca4ee4595f65b262661d166310ad8a149bec
author Keith Busch <keith.busch@intel.com> 1433172593 -0600
committer Jens Axboe <axboe@fb.com> 1433190956 -0600

blk-mq: Shared tag enhancements

Storage controllers may expose multiple block devices that share hardware
resources managed by blk-mq. This patch enhances the shared tags so a
low-level driver can access the shared resources not tied to the unshared
h/w contexts. This way the LLD can dynamically add and delete disks and
request queues without having to track all the request_queue hctx's to
iterate outstanding tags.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>