diff options
author | Christoph Hellwig <hch@lst.de> | 2021-10-12 13:12:24 +0200 |
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committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 14:17:36 +0200 |
commit | 3e08773c3841e9db7a520908cc2b136a77d275ff (patch) | |
tree | 5dce4a3944899f0eb1370a92130e89134da2a714 /block/blk-mq.h | |
parent | block: define 'struct bvec_iter' as packed (diff) | |
download | linux-3e08773c3841e9db7a520908cc2b136a77d275ff.tar.xz linux-3e08773c3841e9db7a520908cc2b136a77d275ff.zip |
block: switch polling to be bio based
Replace the blk_poll interface that requires the caller to keep a queue
and cookie from the submissions with polling based on the bio.
Polling for the bio itself leads to a few advantages:
- the cookie construction can made entirely private in blk-mq.c
- the caller does not need to remember the request_queue and cookie
separately and thus sidesteps their lifetime issues
- keeping the device and the cookie inside the bio allows to trivially
support polling BIOs remapping by stacking drivers
- a lot of code to propagate the cookie back up the submission path can
be removed entirely.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Mark Wunderlich <mark.wunderlich@intel.com>
Link: https://lore.kernel.org/r/20211012111226.760968-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r-- | block/blk-mq.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index a9fe01e14951..8be447995106 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -37,6 +37,8 @@ struct blk_mq_ctx { struct kobject kobj; } ____cacheline_aligned_in_smp; +void blk_mq_submit_bio(struct bio *bio); +int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, unsigned int flags); void blk_mq_exit_queue(struct request_queue *q); int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); void blk_mq_wake_waiters(struct request_queue *q); |