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blk-mq: Add a flag for reserved requests

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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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/1657109034-206040-3-git-send-email-john.garry@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2022-07-06 20:03:50 +08:00 committed by Jens Axboe
parent deef1be18e
commit 99e48cd685
2 changed files with 12 additions and 0 deletions
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6
block/blk-mq.c
View File

@ -475,6 +475,9 @@ retry:
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.
*/
@ -589,6 +592,9 @@ 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)

6
include/linux/blk-mq.h
View File

@ -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 \
@ -825,6 +826,11 @@ 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.