From: Weiping Zhang <zhangweiping@didiglobal.com> To: <axboe@kernel.dk>, <tj@kernel.org> Cc: <linux-block@vger.kernel.org>, <cgroups@vger.kernel.org> Subject: [RFC PATCH v2 1/3] bio: update the real issue size when bio_split Date: Fri, 27 Mar 2020 14:28:50 +0800 [thread overview] Message-ID: <20200327062850.GA12578@192.168.3.9> (raw) The split.bi_iter.bi_size was copied from @bio, bi_issue was initialized in this flow: bio_clone_fast->__bio_clone_fast->blkcg_bio_issue_init So the split->bi_issue has a wrong size, so update the size at here. Change-Id: I1f9c8c973ac1d41f4aea17a9a766b4c4d532f642 Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com> --- block/bio.c | 13 +++++++++++++ include/linux/blk_types.h | 9 +++++++++ 2 files changed, 22 insertions(+) diff --git a/block/bio.c b/block/bio.c index 0985f3422556..8654c4d692e5 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1911,6 +1911,19 @@ struct bio *bio_split(struct bio *bio, int sectors, split->bi_iter.bi_size = sectors << 9; + /* + * reinit bio->bi_issue, the split.bi_iter.bi_size was copied + * from @bio, bi_issue was initialized in this flow: + * bio_clone_fast->__bio_clone_fast->blkcg_bio_issue_init + * + * So the split->bi_issue has a wrong size, so update the size + * at here. + * + * Actually, we can just use blkcg_bio_issue_init, there is just + * a bit difference for the issue_time. + */ + bio_issue_update_size(&split->bi_issue, bio_sectors(split)); + if (bio_integrity(split)) bio_integrity_trim(split); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 70254ae11769..fea81e3775c4 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -128,6 +128,15 @@ static inline sector_t bio_issue_size(struct bio_issue *issue) return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT); } +static inline void bio_issue_update_size(struct bio_issue *issue, sector_t size) +{ + size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1; + /* clear issue_size bits to 0 */ + issue->value &= ~(u64)BIO_ISSUE_SIZE_MASK; + /* set new size */ + issue->value |= ((u64)size << BIO_ISSUE_SIZE_SHIFT); +} + static inline void bio_issue_init(struct bio_issue *issue, sector_t size) { -- 2.18.1
WARNING: multiple messages have this Message-ID (diff)
From: Weiping Zhang <zhangweiping@didiglobal.com> To: axboe@kernel.dk, tj@kernel.org Cc: linux-block@vger.kernel.org, cgroups@vger.kernel.org Subject: [RFC PATCH v2 1/3] bio: update the real issue size when bio_split Date: Fri, 27 Mar 2020 14:28:50 +0800 [thread overview] Message-ID: <20200327062850.GA12578@192.168.3.9> (raw) The split.bi_iter.bi_size was copied from @bio, bi_issue was initialized in this flow: bio_clone_fast->__bio_clone_fast->blkcg_bio_issue_init So the split->bi_issue has a wrong size, so update the size at here. Change-Id: I1f9c8c973ac1d41f4aea17a9a766b4c4d532f642 Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com> --- block/bio.c | 13 +++++++++++++ include/linux/blk_types.h | 9 +++++++++ 2 files changed, 22 insertions(+) diff --git a/block/bio.c b/block/bio.c index 0985f3422556..8654c4d692e5 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1911,6 +1911,19 @@ struct bio *bio_split(struct bio *bio, int sectors, split->bi_iter.bi_size = sectors << 9; + /* + * reinit bio->bi_issue, the split.bi_iter.bi_size was copied + * from @bio, bi_issue was initialized in this flow: + * bio_clone_fast->__bio_clone_fast->blkcg_bio_issue_init + * + * So the split->bi_issue has a wrong size, so update the size + * at here. + * + * Actually, we can just use blkcg_bio_issue_init, there is just + * a bit difference for the issue_time. + */ + bio_issue_update_size(&split->bi_issue, bio_sectors(split)); + if (bio_integrity(split)) bio_integrity_trim(split); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 70254ae11769..fea81e3775c4 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -128,6 +128,15 @@ static inline sector_t bio_issue_size(struct bio_issue *issue) return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT); } +static inline void bio_issue_update_size(struct bio_issue *issue, sector_t size) +{ + size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1; + /* clear issue_size bits to 0 */ + issue->value &= ~(u64)BIO_ISSUE_SIZE_MASK; + /* set new size */ + issue->value |= ((u64)size << BIO_ISSUE_SIZE_SHIFT); +} + static inline void bio_issue_init(struct bio_issue *issue, sector_t size) { -- 2.18.1
next reply other threads:[~2020-03-27 6:28 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-27 6:28 Weiping Zhang [this message] 2020-03-27 6:28 ` [RFC PATCH v2 1/3] bio: update the real issue size when bio_split Weiping Zhang
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