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| author | Ming Lei <ming.lei@canonical.com> | 2014-10-09 23:17:35 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-10-09 13:11:44 -0600 |
| commit | 764f612c6c3c231b9c12cfae7c328ccc9c453258 (patch) | |
| tree | f07edb7a3ed883c1ac66e8ede65a9aa6681cb378 /block | |
| parent | b8839b8c55f3fdd60dc36abcda7e0266aff7985c (diff) | |
| download | linux-764f612c6c3c231b9c12cfae7c328ccc9c453258.tar.gz linux-764f612c6c3c231b9c12cfae7c328ccc9c453258.tar.bz2 linux-764f612c6c3c231b9c12cfae7c328ccc9c453258.zip | |
blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio
It isn't correct to figure out req->bi_phys_segments from bio->bi_vcnt
if the bio is cloned.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-merge.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/block/blk-merge.c b/block/blk-merge.c index f71bad35b4cc..ba99351c0f58 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -97,14 +97,18 @@ void blk_recalc_rq_segments(struct request *rq) void blk_recount_segments(struct request_queue *q, struct bio *bio) { - if (test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags) && + bool no_sg_merge = !!test_bit(QUEUE_FLAG_NO_SG_MERGE, + &q->queue_flags); + + if (no_sg_merge && !bio_flagged(bio, BIO_CLONED) && bio->bi_vcnt < queue_max_segments(q)) bio->bi_phys_segments = bio->bi_vcnt; else { struct bio *nxt = bio->bi_next; bio->bi_next = NULL; - bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio, false); + bio->bi_phys_segments = __blk_recalc_rq_segments(q, bio, + no_sg_merge); bio->bi_next = nxt; } |