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authorChristoph Hellwig <hch@lst.de>2014-05-28 18:08:02 +0400
committerJens Axboe <axboe@fb.com>2014-05-28 18:08:02 +0400
commit6fca6a611c27f1f0d90fbe1cc3c229dbf8c09e48 (patch)
treed3348f3ab1169db9b5a1fca67a8fd2164152530c /include/linux/blk-mq.h
parent7738dac4f697ffbd0ed4c4aeb69a714ef9d876da (diff)
downloadlinux-6fca6a611c27f1f0d90fbe1cc3c229dbf8c09e48.tar.xz
blk-mq: add helper to insert requests from irq context
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>
Diffstat (limited to 'include/linux/blk-mq.h')
-rw-r--r--include/linux/blk-mq.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 5b171fbe95c5..b9a74a386dbc 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -172,6 +172,8 @@ void blk_mq_end_io(struct request *rq, int error);
void __blk_mq_end_io(struct request *rq, int error);
void blk_mq_requeue_request(struct request *rq);
+void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
+void blk_mq_kick_requeue_list(struct request_queue *q);
void blk_mq_complete_request(struct request *rq);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);