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authorMing Lei <ming.lei@redhat.com>2018-12-17 08:44:05 -0700
committerJens Axboe <axboe@kernel.dk>2018-12-17 11:19:54 -0700
commitc16d6b5a9f47d0e581882269fca1d73be60208b2 (patch)
tree778a7ca836078f6cca15630f25b0d652320f5cb8 /block/blk-mq.h
parent7211aef86f79583e59b88a0aba0bc830566f7e8e (diff)
downloadlinux-c16d6b5a9f47d0e581882269fca1d73be60208b2.tar.bz2
blk-mq: fix dispatch from sw queue
When a request is added to rq list of sw queue(ctx), the rq may be from a different type of hctx, especially after multi queue mapping is introduced. So when dispach request from sw queue via blk_mq_flush_busy_ctxs() or blk_mq_dequeue_from_ctx(), one request belonging to other queue type of hctx can be dispatched to current hctx in case that read queue or poll queue is enabled. This patch fixes this issue by introducing per-queue-type list. Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Changed by me to not use separately cacheline aligned lists, just place them all in the same cacheline where we had just the one list and lock before. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r--block/blk-mq.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h
index d1ed096723fb..d943d46b0785 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -18,8 +18,8 @@ struct blk_mq_ctxs {
struct blk_mq_ctx {
struct {
spinlock_t lock;
- struct list_head rq_list;
- } ____cacheline_aligned_in_smp;
+ struct list_head rq_lists[HCTX_MAX_TYPES];
+ } ____cacheline_aligned_in_smp;
unsigned int cpu;
unsigned short index_hw[HCTX_MAX_TYPES];