diff options
| author | Jens Axboe <axboe@kernel.dk> | 2021-10-15 09:44:38 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 08:51:52 -0600 |
| commit | 2ff0682da6e09c1e0db63a2d2abcd4efb531c8db (patch) | |
| tree | 33c4b58cfd5f1e64981aa654043081e531d0e4fe /include/linux/blk-mq.h | |
| parent | 90b8faa0e8de1b02b619fb33f6c6e1e13e7d1d70 (diff) | |
block: store elevator state in request
Add an rq private RQF_ELV flag, which tells the block layer that this
request was initialized on a queue that has an IO scheduler attached.
This allows for faster checking in the fast path, rather than having to
deference rq->q later on.
Elevator switching does full quiesce of the queue before detaching an
IO scheduler, so it's safe to cache this in the request itself.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk-mq.h')
| -rw-r--r-- | include/linux/blk-mq.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 8ca9728cc7f2..95c3bd3a008e 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -55,6 +55,8 @@ typedef __u32 __bitwise req_flags_t; #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) /* ->timeout has been called, don't expire again */ #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) +/* queue has elevator attached */ +#define RQF_ELV ((__force req_flags_t)(1 << 22)) /* flags that prevent us from merging requests: */ #define RQF_NOMERGE_FLAGS \ |