diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-07-27 12:22:56 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-08-02 17:22:54 -0600 |
| commit | 51d798cdb5c219000fe76a3ffbcaa846b689ba80 (patch) | |
| tree | f80c9ae63c33edb1fbb31c1e92d4c46253aea4c4 /block/bounce.c | |
| parent | 5a97806f7dc069d9561d9930a2ae108700e222ab (diff) | |
| download | lwn-51d798cdb5c219000fe76a3ffbcaa846b689ba80.tar.gz lwn-51d798cdb5c219000fe76a3ffbcaa846b689ba80.zip | |
block: change the blk_queue_bounce calling convention
The double indirect bio leads to somewhat suboptimal code generation.
Instead return the (original or split) bio, and make sure the
request_queue arguments to the lower level helpers is passed after the
bio to avoid constant reshuffling of the argument passing registers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220727162300.3089193-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bounce.c')
| -rw-r--r-- | block/bounce.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/block/bounce.c b/block/bounce.c index c8f487af7be3..7cfcb242f9a1 100644 --- a/block/bounce.c +++ b/block/bounce.c @@ -199,24 +199,24 @@ err_put: return NULL; } -void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig) +struct bio *__blk_queue_bounce(struct bio *bio_orig, struct request_queue *q) { struct bio *bio; - int rw = bio_data_dir(*bio_orig); + int rw = bio_data_dir(bio_orig); struct bio_vec *to, from; struct bvec_iter iter; unsigned i = 0, bytes = 0; bool bounce = false; int sectors; - bio_for_each_segment(from, *bio_orig, iter) { + bio_for_each_segment(from, bio_orig, iter) { if (i++ < BIO_MAX_VECS) bytes += from.bv_len; if (PageHighMem(from.bv_page)) bounce = true; } if (!bounce) - return; + return bio_orig; /* * Individual bvecs might not be logical block aligned. Round down @@ -225,13 +225,13 @@ void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig) */ sectors = ALIGN_DOWN(bytes, queue_logical_block_size(q)) >> SECTOR_SHIFT; - if (sectors < bio_sectors(*bio_orig)) { - bio = bio_split(*bio_orig, sectors, GFP_NOIO, &bounce_bio_split); - bio_chain(bio, *bio_orig); - submit_bio_noacct(*bio_orig); - *bio_orig = bio; + if (sectors < bio_sectors(bio_orig)) { + bio = bio_split(bio_orig, sectors, GFP_NOIO, &bounce_bio_split); + bio_chain(bio, bio_orig); + submit_bio_noacct(bio_orig); + bio_orig = bio; } - bio = bounce_clone_bio(*bio_orig); + bio = bounce_clone_bio(bio_orig); /* * Bvec table can't be updated by bio_for_each_segment_all(), @@ -254,7 +254,7 @@ void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig) to->bv_page = bounce_page; } - trace_block_bio_bounce(*bio_orig); + trace_block_bio_bounce(bio_orig); bio->bi_flags |= (1 << BIO_BOUNCED); @@ -263,6 +263,6 @@ void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig) else bio->bi_end_io = bounce_end_io_write; - bio->bi_private = *bio_orig; - *bio_orig = bio; + bio->bi_private = bio_orig; + return bio; } |