block: introduce 'blk_mq_ctx' parameter to blk_get_flush_queue
This patch adds 'blk_mq_ctx' parameter to blk_get_flush_queue(),
so that this function can find the corresponding blk_flush_queue
bound with current mq context since the flush queue will become
per hw-queue.
For legacy queue, the parameter can be simply 'NULL'.
For multiqueue case, the parameter should be set as the context
from which the related request is originated. With this context
info, the hw queue and related flush queue can be found easily.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 9bc5b4f..004d95e 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -223,7 +223,7 @@
bool queued = false;
struct request *rq, *n;
unsigned long flags = 0;
- struct blk_flush_queue *fq = blk_get_flush_queue(q);
+ struct blk_flush_queue *fq = blk_get_flush_queue(q, flush_rq->mq_ctx);
if (q->mq_ops) {
spin_lock_irqsave(&fq->mq_flush_lock, flags);
@@ -319,7 +319,7 @@
static void flush_data_end_io(struct request *rq, int error)
{
struct request_queue *q = rq->q;
- struct blk_flush_queue *fq = blk_get_flush_queue(q);
+ struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);
/*
* After populating an empty queue, kick it to avoid stall. Read
@@ -333,11 +333,10 @@
{
struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx;
- struct blk_mq_ctx *ctx;
+ struct blk_mq_ctx *ctx = rq->mq_ctx;
unsigned long flags;
- struct blk_flush_queue *fq = blk_get_flush_queue(q);
+ struct blk_flush_queue *fq = blk_get_flush_queue(q, ctx);
- ctx = rq->mq_ctx;
hctx = q->mq_ops->map_queue(q, ctx->cpu);
/*
@@ -367,7 +366,7 @@
struct request_queue *q = rq->q;
unsigned int fflags = q->flush_flags; /* may change, cache */
unsigned int policy = blk_flush_policy(fflags, rq);
- struct blk_flush_queue *fq = blk_get_flush_queue(q);
+ struct blk_flush_queue *fq = blk_get_flush_queue(q, rq->mq_ctx);
/*
* @policy now records what operations need to be done. Adjust
