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blk-mq: add helper to insert requests from irq context

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Both the cache flush state machine and the SCSI midlayer want to submit
requests from irq context, and the current per-request requeue_work
unfortunately causes corruption due to sharing with the csd field for
flushes.  Replace them with a per-request_queue list of requests to
be requeued.

Based on an earlier test by Ming Lei.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Ming Lei <tom.leiming@gmail.com>
Tested-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-05-28 08:08:02 -06:00 • committed by Jens Axboe
parent 7738dac4f6
commit 6fca6a611c
4 changed files with 73 additions and 14 deletions
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5
include/linux/blkdev.h
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@ -99,7 +99,6 @@ struct request {
struct list_head queuelist;
union {
struct call_single_data csd;
struct work_struct requeue_work;
unsigned long fifo_time;
};
@ -463,6 +462,10 @@ struct request_queue {
struct request *flush_rq;
spinlock_t mq_flush_lock;
struct list_head requeue_list;
spinlock_t requeue_lock;
struct work_struct requeue_work;
struct mutex sysfs_lock;
int bypass_depth;