diff options
| author | Jens Axboe <axboe@kernel.dk> | 2017-06-27 09:22:02 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-06-27 12:05:27 -0600 |
| commit | cb6934f8ea1a595902ca37e250e0917d4dd7b2a7 (patch) | |
| tree | 4280f328f9b632f6940a613e852f264918619e55 /block | |
| parent | c75b1d9421f80f4143e389d2d50ddfc8a28c8c35 (diff) | |
| download | op-kernel-dev-cb6934f8ea1a595902ca37e250e0917d4dd7b2a7.zip op-kernel-dev-cb6934f8ea1a595902ca37e250e0917d4dd7b2a7.tar.gz | |
block: add support for write hints in a bio
No functional changes in this patch, we just use up some holes
in the bio and request structures to define a write hint that
we psas down the stack.
Ensure that we don't merge requests that have different life time
hints assigned to them, and that we inherit the write hint when
cloning a bio.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 2 | ||||
| -rw-r--r-- | block/blk-core.c | 1 | ||||
| -rw-r--r-- | block/blk-merge.c | 14 |
3 files changed, 17 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index 89a51bd..9cf98b2 100644 --- a/block/bio.c +++ b/block/bio.c @@ -596,6 +596,7 @@ void __bio_clone_fast(struct bio *bio, struct bio *bio_src) bio->bi_bdev = bio_src->bi_bdev; bio_set_flag(bio, BIO_CLONED); bio->bi_opf = bio_src->bi_opf; + bio->bi_write_hint = bio_src->bi_write_hint; bio->bi_iter = bio_src->bi_iter; bio->bi_io_vec = bio_src->bi_io_vec; @@ -679,6 +680,7 @@ struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask, return NULL; bio->bi_bdev = bio_src->bi_bdev; bio->bi_opf = bio_src->bi_opf; + bio->bi_write_hint = bio_src->bi_write_hint; bio->bi_iter.bi_sector = bio_src->bi_iter.bi_sector; bio->bi_iter.bi_size = bio_src->bi_iter.bi_size; diff --git a/block/blk-core.c b/block/blk-core.c index 3c18ea6..af393d5 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1765,6 +1765,7 @@ void blk_init_request_from_bio(struct request *req, struct bio *bio) req->ioprio = ioc->ioprio; else req->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0); + req->write_hint = bio->bi_write_hint; blk_rq_bio_prep(req->q, req, bio); } EXPORT_SYMBOL_GPL(blk_init_request_from_bio); diff --git a/block/blk-merge.c b/block/blk-merge.c index 5df1304..99038830 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -673,6 +673,13 @@ static struct request *attempt_merge(struct request_queue *q, return NULL; /* + * Don't allow merge of different write hints, or for a hint with + * non-hint IO. + */ + if (req->write_hint != next->write_hint) + return NULL; + + /* * If we are allowed to merge, then append bio list * from next to rq and release next. merge_requests_fn * will have updated segment counts, update sector @@ -791,6 +798,13 @@ bool blk_rq_merge_ok(struct request *rq, struct bio *bio) !blk_write_same_mergeable(rq->bio, bio)) return false; + /* + * Don't allow merge of different write hints, or for a hint with + * non-hint IO. + */ + if (rq->write_hint != bio->bi_write_hint) + return false; + return true; } |
