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Diffstat (limited to 'block/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index d9d0984d2f01..e644feec068c 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -275,6 +275,26 @@ void blk_mq_free_request(struct request *rq) __blk_mq_free_request(hctx, ctx, rq); } +/* + * Clone all relevant state from a request that has been put on hold in + * the flush state machine into the preallocated flush request that hangs + * off the request queue. + * + * For a driver the flush request should be invisible, that's why we are + * impersonating the original request here. + */ +void blk_mq_clone_flush_request(struct request *flush_rq, + struct request *orig_rq) +{ + struct blk_mq_hw_ctx *hctx = + orig_rq->q->mq_ops->map_queue(orig_rq->q, orig_rq->mq_ctx->cpu); + + flush_rq->mq_ctx = orig_rq->mq_ctx; + flush_rq->tag = orig_rq->tag; + memcpy(blk_mq_rq_to_pdu(flush_rq), blk_mq_rq_to_pdu(orig_rq), + hctx->cmd_size); +} + bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes) { if (blk_update_request(rq, error, blk_rq_bytes(rq))) |