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| author | Jens Axboe <axboe@fb.com> | 2017-01-17 06:03:22 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-17 10:04:20 -0700 |
| commit | bd166ef183c263c5ced656d49ef19c7da4adc774 (patch) | |
| tree | 449bbd3b4e671b370b96e3846b2281116e7089e9 /include/linux/blkdev.h | |
| parent | 2af8cbe30531eca73c8f3ba277f155fc0020b01a (diff) | |
| download | op-kernel-dev-bd166ef183c263c5ced656d49ef19c7da4adc774.zip op-kernel-dev-bd166ef183c263c5ced656d49ef19c7da4adc774.tar.gz | |
blk-mq-sched: add framework for MQ capable IO schedulers
This adds a set of hooks that intercepts the blk-mq path of
allocating/inserting/issuing/completing requests, allowing
us to develop a scheduler within that framework.
We reuse the existing elevator scheduler API on the registration
side, but augment that with the scheduler flagging support for
the blk-mq interfce, and with a separate set of ops hooks for MQ
devices.
We split driver and scheduler tags, so we can run the scheduling
independently of device queue depth.
Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 2e99d65..2556485 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -154,6 +154,7 @@ struct request { /* the following two fields are internal, NEVER access directly */ unsigned int __data_len; /* total data len */ + int tag; sector_t __sector; /* sector cursor */ struct bio *bio; @@ -220,9 +221,10 @@ struct request { unsigned short ioprio; + int internal_tag; + void *special; /* opaque pointer available for LLD use */ - int tag; int errors; /* |
