[PATCH for-6.18/block 09/16] md/raid10: add a new r10bio flag R10BIO_Returned

Yu Kuai
2025-09-05T07:16:00Z

From: Yu Kuai <yukuai3@huawei.com>

The new helper bio_submit_split_bioset() can failed the orginal bio on
split errors, prepare to handle this case in raid_end_bio_io().

The flag name is refer to the r1bio flag name.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
drivers/md/raid10.c | 8 +++++---
drivers/md/raid10.h | 2 ++
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 859c40a5ecf4..a775a1317635 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -322,10 +322,12 @@ static void raid_end_bio_io(struct r10bio *r10_bio)
struct bio *bio = r10_bio->master_bio;
struct r10conf *conf = r10_bio->mddev->private;

- if (!test_bit(R10BIO_Uptodate, &r10_bio->state))
- bio->bi_status = BLK_STS_IOERR;
+ if (!test_and_set_bit(R10BIO_Returned, &r10_bio->state)) {
+ if (!test_bit(R10BIO_Uptodate, &r10_bio->state))
+ bio->bi_status = BLK_STS_IOERR;
+ bio_endio(bio);
+ }

- bio_endio(bio);
/*
* Wake up any possible resync thread that waits for the device
* to go idle.
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 3f16ad6904a9..da00a55f7a55 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -165,6 +165,8 @@ enum r10bio_state {
* so that raid10d knows what to do with them.
*/
R10BIO_ReadError,
+/* For bio_split errors, record that bi_end_io was called. */
+ R10BIO_Returned,
/* If a write for this request means we can clear some
* known-bad-block records, we set this flag.
*/
--
2.39.2