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| author | Tejun Heo <tj@kernel.org> | 2009-07-03 17:48:16 +0900 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-09-11 14:33:27 +0200 |
| commit | a82afdfcb8c0df09776b6458af6b68fc58b2e87b (patch) | |
| tree | d53910e4c2e9d1502cf2a7ce67a67cc54decb7fa /block | |
| parent | 0d03d59d9b31cd1e33b7e46a80b6fef66244b1f2 (diff) | |
| download | linux-a82afdfcb8c0df09776b6458af6b68fc58b2e87b.tar.gz linux-a82afdfcb8c0df09776b6458af6b68fc58b2e87b.tar.bz2 linux-a82afdfcb8c0df09776b6458af6b68fc58b2e87b.zip | |
block: use the same failfast bits for bio and request
bio and request use the same set of failfast bits. This patch makes
the following changes to simplify things.
* enumify BIO_RW* bits and reorder bits such that BIOS_RW_FAILFAST_*
bits coincide with __REQ_FAILFAST_* bits.
* The above pushes BIO_RW_AHEAD out of sync with __REQ_FAILFAST_DEV
but the matching is useless anyway. init_request_from_bio() is
responsible for setting FAILFAST bits on FS requests and non-FS
requests never use BIO_RW_AHEAD. Drop the code and comment from
blk_rq_bio_prep().
* Define REQ_FAILFAST_MASK which is OR of all FAILFAST bits and
simplify FAILFAST flags handling in init_request_from_bio().
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index e3299a77a0d8..4daae1ee2b23 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1111,17 +1111,13 @@ void init_request_from_bio(struct request *req, struct bio *bio) req->cmd_type = REQ_TYPE_FS; /* - * inherit FAILFAST from bio (for read-ahead, and explicit FAILFAST) + * Inherit FAILFAST from bio (for read-ahead, and explicit + * FAILFAST). FAILFAST flags are identical for req and bio. */ if (bio_rw_ahead(bio)) - req->cmd_flags |= (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | - REQ_FAILFAST_DRIVER); - if (bio_failfast_dev(bio)) - req->cmd_flags |= REQ_FAILFAST_DEV; - if (bio_failfast_transport(bio)) - req->cmd_flags |= REQ_FAILFAST_TRANSPORT; - if (bio_failfast_driver(bio)) - req->cmd_flags |= REQ_FAILFAST_DRIVER; + req->cmd_flags |= REQ_FAILFAST_MASK; + else + req->cmd_flags |= bio->bi_rw & REQ_FAILFAST_MASK; if (unlikely(bio_discard(bio))) { req->cmd_flags |= REQ_DISCARD; @@ -2239,9 +2235,8 @@ EXPORT_SYMBOL(__blk_end_request_cur); void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio) { - /* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw, and - we want BIO_RW_AHEAD (bit 1) to imply REQ_FAILFAST (bit 1). */ - rq->cmd_flags |= (bio->bi_rw & 3); + /* Bit 0 (R/W) is identical in rq->cmd_flags and bio->bi_rw */ + rq->cmd_flags |= bio->bi_rw & REQ_RW; if (bio_has_data(bio)) { rq->nr_phys_segments = bio_phys_segments(q, bio); |