kernel/include/linux/blk-mq.h, branch linux-4.1.y

blk-mq: fix iteration of busy bitmap

2015-04-17T14:31:12Z

Commit 889fa31f00b2 was a bit too eager in reducing the loop count, so we ended up missing queues in some configurations. Ensure that our division rounds up, so that's not the case. Reported-by: Guenter Roeck Fixes: 889fa31f00b2 ("blk-mq: reduce unnecessary software queue looping") Signed-off-by: Jens Axboe

blk-mq: cleanup blk_mq_rq_to_pdu()

2015-04-09T21:54:05Z

Casting to void and adding the size of the request is "shit code" and only a "crazy monkey on crack" would write that. So lets clean it up. Signed-off-by: Jens Axboe

blk-mq: export blk_mq_run_hw_queues

2015-03-13T14:28:33Z

Rename blk_mq_run_queues to blk_mq_run_hw_queues, add async argument, and export it. DM's suspend support must be able to run the queue without starting stopped hw queues. Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe

blk-mq: add blk_mq_init_allocated_queue and export blk_mq_register_disk

2015-03-13T14:26:53Z

Add a variant of blk_mq_init_queue that allows a previously allocated queue to be initialized. blk_mq_init_allocated_queue models blk_init_allocated_queue -- which was also created for DM's use. DM's approach to device creation requires a placeholder request_queue be allocated for use with alloc_dev() but the decision about what type of request_queue will be ultimately created is deferred until all component devices referenced in the DM table are processed to determine the table type (request-based, blk-mq request-based, or bio-based). Also, because of DM's late finalization of the request_queue type the call to blk_mq_register_disk() doesn't happen during alloc_dev(). Must export blk_mq_register_disk() so that DM can backfill the 'mq' dir once the blk-mq queue is fully allocated. Signed-off-by: Mike Snitzer Reviewed-by: Ming Lei Signed-off-by: Jens Axboe

Merge branch 'for-3.20/core' of git://git.kernel.dk/linux-block

2015-02-12T22:13:23Z

Pull core block IO changes from Jens Axboe: "This contains: - A series from Christoph that cleans up and refactors various parts of the REQ_BLOCK_PC handling. Contributions in that series from Dongsu Park and Kent Overstreet as well. - CFQ: - A bug fix for cfq for realtime IO scheduling from Jeff Moyer. - A stable patch fixing a potential crash in CFQ in OOM situations. From Konstantin Khlebnikov. - blk-mq: - Add support for tag allocation policies, from Shaohua. This is a prep patch enabling libata (and other SCSI parts) to use the blk-mq tagging, instead of rolling their own. - Various little tweaks from Keith and Mike, in preparation for DM blk-mq support. - Minor little fixes or tweaks from me. - A double free error fix from Tony Battersby. - The partition 4k issue fixes from Matthew and Boaz. - Add support for zero+unprovision for blkdev_issue_zeroout() from Martin" * 'for-3.20/core' of git://git.kernel.dk/linux-block: (27 commits) block: remove unused function blk_bio_map_sg block: handle the null_mapped flag correctly in blk_rq_map_user_iov blk-mq: fix double-free in error path block: prevent request-to-request merging with gaps if not allowed blk-mq: make blk_mq_run_queues() static dm: fix multipath regression due to initializing wrong request cfq-iosched: handle failure of cfq group allocation block: Quiesce zeroout wrapper block: rewrite and split __bio_copy_iov() block: merge __bio_map_user_iov into bio_map_user_iov block: merge __bio_map_kern into bio_map_kern block: pass iov_iter to the BLOCK_PC mapping functions block: add a helper to free bio bounce buffer pages block: use blk_rq_map_user_iov to implement blk_rq_map_user block: simplify bio_map_kern block: mark blk-mq devices as stackable block: keep established cmd_flags when cloning into a blk-mq request block: add blk-mq support to blk_insert_cloned_request() block: require blk_rq_prep_clone() be given an initialized clone request blk-mq: add tag allocation policy ...

blk-mq: make blk_mq_run_queues() static

2015-02-10T20:31:34Z

We no longer use it outside of blk-mq.c, so we can make it static and stop exporting it. Additionally, kill the 'async' argument, as there's only one used of it. Signed-off-by: Jens Axboe

blk-mq: add tag allocation policy

2015-01-23T21:18:00Z

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 Cc: Tejun Heo Cc: Christoph Hellwig Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe

blk-mq: Add helper to abort requeued requests

2015-01-08T15:55:53Z

Adds a helper function a driver can use to abort requeued requests in case any are pending when h/w queues are being removed. Signed-off-by: Jens Axboe

blk-mq: Let drivers cancel requeue_work

2015-01-08T15:55:40Z

Kicking requeued requests will start h/w queues in a work_queue, which may alter the driver's requested state to temporarily stop them. This patch exports a method to cancel the q->requeue_work so a driver can be assured stopped h/w queues won't be started up before it is ready. Signed-off-by: Keith Busch Signed-off-by: Jens Axboe

blk-mq: Export if requests were started

2015-01-08T15:55:27Z

Drivers can iterate over all allocated request tags, but their callback needs a way to know if the driver started the request in the first place. Signed-off-by: Keith Busch Signed-off-by: Jens Axboe