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| author | Christoph Hellwig <hch@lst.de> | 2019-08-12 17:39:56 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-08-22 07:14:36 -0600 |
| commit | 320ea869a12cec206756207c6ca5f817ec45c7f2 (patch) | |
| tree | f47241df847ce8a065edf328cf94794e8f4694c0 /block/bio.c | |
| parent | e9e006f5fcf2bab59149cb38a48a4817c1b538b4 (diff) | |
| download | linux-320ea869a12cec206756207c6ca5f817ec45c7f2.tar.gz linux-320ea869a12cec206756207c6ca5f817ec45c7f2.tar.xz | |
block: improve the gap check in __bio_add_pc_page
If we can add more data into an existing segment we do not create a gap
per definition, so move the check for a gap after the attempt to merge
into the segment.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bio.c')
| -rw-r--r-- | block/bio.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/block/bio.c b/block/bio.c index 54769659a434..537d71a30e56 100644 --- a/block/bio.c +++ b/block/bio.c @@ -710,18 +710,18 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio, goto done; } - /* - * If the queue doesn't support SG gaps and adding this - * offset would create a gap, disallow it. - */ - if (bvec_gap_to_prev(q, bvec, offset)) - return 0; - if (page_is_mergeable(bvec, page, len, offset, &same_page) && can_add_page_to_seg(q, bvec, page, len, offset)) { bvec->bv_len += len; goto done; } + + /* + * If the queue doesn't support SG gaps and adding this segment + * would create a gap, disallow it. + */ + if (bvec_gap_to_prev(q, bvec, offset)) + return 0; } if (bio_full(bio, len)) |