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| author | NeilBrown <neilb@suse.de> | 2007-09-25 12:35:59 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@carl.home.kernel.dk> | 2007-10-10 09:25:56 +0200 |
| commit | 5705f7021748a69d84d6567e68e8851dab551464 (patch) | |
| tree | 5a6dbc8fc6055c0334f4a97540e36a7844b9c482 /include | |
| parent | 9dfa52831e96194b8649613e3131baa2c109f7dc (diff) | |
| download | linux-3.10-5705f7021748a69d84d6567e68e8851dab551464.tar.gz linux-3.10-5705f7021748a69d84d6567e68e8851dab551464.tar.bz2 linux-3.10-5705f7021748a69d84d6567e68e8851dab551464.zip | |
Introduce rq_for_each_segment replacing rq_for_each_bio
Every usage of rq_for_each_bio wraps a usage of
bio_for_each_segment, so these can be combined into
rq_for_each_segment.
We define "struct req_iterator" to hold the 'bio' and 'index' that
are needed for the double iteration.
Signed-off-by: Neil Brown <neilb@suse.de>
Various compile fixes by me...
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index b126c6f68e2..a4b13b8a9d0 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -637,10 +637,23 @@ static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) } #endif /* CONFIG_MMU */ -#define rq_for_each_bio(_bio, rq) \ +struct req_iterator { + int i; + struct bio *bio; +}; + +/* This should not be used directly - use rq_for_each_segment */ +#define __rq_for_each_bio(_bio, rq) \ if ((rq->bio)) \ for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) +#define rq_for_each_segment(bvl, _rq, _iter) \ + __rq_for_each_bio(_iter.bio, _rq) \ + bio_for_each_segment(bvl, _iter.bio, _iter.i) + +#define rq_iter_last(rq, _iter) \ + (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) + extern int blk_register_queue(struct gendisk *disk); extern void blk_unregister_queue(struct gendisk *disk); extern void register_disk(struct gendisk *dev); |