From: Yu Kuai yukuai3@huawei.com
[ Upstream commit 22f166218f7313e8fe2d19213b5f4b3265f8c39e ]
If bio is split by internal handling like chunksize or badblocks, the corresponding trace_block_split() is missing, resulting in blktrace inability to catch BIO split events and making it harder to analyze the BIO sequence.
Cc: stable@vger.kernel.org Fixes: 4b1faf931650 ("block: Kill bio_pair_split()") Signed-off-by: Yu Kuai yukuai3@huawei.com Reviewed-by: Damien Le Moal dlemoal@kernel.org Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/md-linear.c | 1 + drivers/md/raid0.c | 4 ++++ drivers/md/raid1.c | 4 ++++ drivers/md/raid10.c | 8 ++++++++ drivers/md/raid5.c | 2 ++ 5 files changed, 19 insertions(+)
diff --git a/drivers/md/md-linear.c b/drivers/md/md-linear.c index 369aed044b409..d733ebee624b7 100644 --- a/drivers/md/md-linear.c +++ b/drivers/md/md-linear.c @@ -267,6 +267,7 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio) }
bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; } diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 67ec633d27e26..db1ab214250f9 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -470,7 +470,9 @@ static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) bio_endio(bio); return; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; end = zone->zone_end; @@ -618,7 +620,9 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio) bio_endio(bio); return true; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); raid0_map_submit_bio(mddev, bio); bio = split; } diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 31081d9e94025..4c6b1bd6da9bb 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1383,7 +1383,9 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio, error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; r1_bio->master_bio = bio; @@ -1574,7 +1576,9 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; r1_bio->master_bio = bio; diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index d02bd096824c8..b0062ad9b1d95 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1208,7 +1208,9 @@ static void raid10_read_request(struct mddev *mddev, struct bio *bio, error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); submit_bio_noacct(bio); wait_barrier(conf, false); @@ -1484,7 +1486,9 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio, error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); submit_bio_noacct(bio); wait_barrier(conf, false); @@ -1669,7 +1673,9 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio) bio_endio(bio); return 0; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); /* Resend the fist split part */ submit_bio_noacct(split); @@ -1684,7 +1690,9 @@ static int raid10_handle_discard(struct mddev *mddev, struct bio *bio) bio_endio(bio); return 0; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); /* Resend the second split part */ submit_bio_noacct(bio); diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 39e7596e78c0b..4fae8ade24090 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5484,8 +5484,10 @@ static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)
if (sectors < bio_sectors(raid_bio)) { struct r5conf *conf = mddev->private; + split = bio_split(raid_bio, sectors, GFP_NOIO, &conf->bio_split); bio_chain(split, raid_bio); + trace_block_split(split, raid_bio->bi_iter.bi_sector); submit_bio_noacct(raid_bio); raid_bio = split; }