diff mbox series

[2/5] blk-mq: Add a flag for reserved requests

Message ID 1655463320-241202-3-git-send-email-john.garry@huawei.com (mailing list archive)
State Superseded
Headers show
Series blk-mq: Add a flag for reserved requests series | expand

Commit Message

John Garry June 17, 2022, 10:55 a.m. UTC 
Add a flag for reserved requests so that drivers may know this for any
special handling.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
---
 block/blk-mq.c         | 6 ++++++
 include/linux/blk-mq.h | 6 ++++++
 2 files changed, 12 insertions(+)

Comments

Hannes Reinecke June 20, 2022, 9:15 a.m. UTC | #1 
On 6/17/22 12:55, John Garry wrote:
> Add a flag for reserved requests so that drivers may know this for any
> special handling.
> 
> Signed-off-by: John Garry <john.garry@huawei.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>
> ---
>   block/blk-mq.c         | 6 ++++++
>   include/linux/blk-mq.h | 6 ++++++
>   2 files changed, 12 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
diff mbox series

Patch

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7a5558bbc7f6..15e66416de60 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -474,6 +474,9 @@  static struct request *__blk_mq_alloc_requests(struct blk_mq_alloc_data *data)
 	if (!(data->rq_flags & RQF_ELV))
 		blk_mq_tag_busy(data->hctx);
 
+	if (data->flags & BLK_MQ_REQ_RESERVED)
+		data->rq_flags |= RQF_RESV;
+
 	/*
 	 * Try batched alloc if we want more than 1 tag.
 	 */
@@ -586,6 +589,9 @@  struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
 	else
 		data.rq_flags |= RQF_ELV;
 
+	if (flags & BLK_MQ_REQ_RESERVED)
+		data.rq_flags |= RQF_RESV;
+
 	ret = -EWOULDBLOCK;
 	tag = blk_mq_get_tag(&data);
 	if (tag == BLK_MQ_NO_TAG)
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index e2d9daf7e8dd..6d81fe10e850 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -57,6 +57,7 @@  typedef __u32 __bitwise req_flags_t;
 #define RQF_TIMED_OUT		((__force req_flags_t)(1 << 21))
 /* queue has elevator attached */
 #define RQF_ELV			((__force req_flags_t)(1 << 22))
+#define RQF_RESV			((__force req_flags_t)(1 << 23))
 
 /* flags that prevent us from merging requests: */
 #define RQF_NOMERGE_FLAGS \
@@ -823,6 +824,11 @@  static inline bool blk_mq_need_time_stamp(struct request *rq)
 	return (rq->rq_flags & (RQF_IO_STAT | RQF_STATS | RQF_ELV));
 }
 
+static inline bool blk_mq_is_reserved_rq(struct request *rq)
+{
+	return rq->rq_flags & RQF_RESV;
+}
+
 /*
  * Batched completions only work when there is no I/O error and no special
  * ->end_io handler.