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charset="utf-8" Add proper bio_split() error handling. For any error, call raid_end_bio_io() and return. For the case of an in the write path, we need to undo the increment in the rdev pending count and NULLify the r1_bio->bios[] pointers. For read path failure, we need to undo rdev pending count increment from the earlier read_balance() call. Signed-off-by: John Garry Reviewed-by: Hannes Reinecke Reviewed-by: Yu Kuai --- drivers/md/raid1.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 6c9d24203f39..7e023e9303c8 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1322,7 +1322,7 @@ static void raid1_read_request(struct mddev *mddev, s= truct bio *bio, const enum req_op op =3D bio_op(bio); const blk_opf_t do_sync =3D bio->bi_opf & REQ_SYNC; int max_sectors; - int rdisk; + int rdisk, error; bool r1bio_existed =3D !!r1_bio; =20 /* @@ -1383,6 +1383,11 @@ static void raid1_read_request(struct mddev *mddev, = struct bio *bio, if (max_sectors < bio_sectors(bio)) { struct bio *split =3D bio_split(bio, max_sectors, gfp, &conf->bio_split); + + if (IS_ERR(split)) { + error =3D PTR_ERR(split); + goto err_handle; + } bio_chain(split, bio); submit_bio_noacct(bio); bio =3D split; @@ -1410,6 +1415,13 @@ static void raid1_read_request(struct mddev *mddev, = struct bio *bio, read_bio->bi_private =3D r1_bio; mddev_trace_remap(mddev, read_bio, r1_bio->sector); submit_bio_noacct(read_bio); + return; + +err_handle: + atomic_dec(&mirror->rdev->nr_pending); + bio->bi_status =3D errno_to_blk_status(error); + set_bit(R1BIO_Uptodate, &r1_bio->state); + raid_end_bio_io(r1_bio); } =20 static void raid1_write_request(struct mddev *mddev, struct bio *bio, @@ -1417,7 +1429,7 @@ static void raid1_write_request(struct mddev *mddev, = struct bio *bio, { struct r1conf *conf =3D mddev->private; struct r1bio *r1_bio; - int i, disks; + int i, disks, k, error; unsigned long flags; struct md_rdev *blocked_rdev; int first_clone; @@ -1576,6 +1588,11 @@ static void raid1_write_request(struct mddev *mddev,= struct bio *bio, if (max_sectors < bio_sectors(bio)) { struct bio *split =3D bio_split(bio, max_sectors, GFP_NOIO, &conf->bio_split); + + if (IS_ERR(split)) { + error =3D PTR_ERR(split); + goto err_handle; + } bio_chain(split, bio); submit_bio_noacct(bio); bio =3D split; @@ -1660,6 +1677,18 @@ static void raid1_write_request(struct mddev *mddev,= struct bio *bio, =20 /* In case raid1d snuck in to freeze_array */ wake_up_barrier(conf); + return; +err_handle: + for (k =3D 0; k < i; k++) { + if (r1_bio->bios[k]) { + rdev_dec_pending(conf->mirrors[k].rdev, mddev); + r1_bio->bios[k] =3D NULL; + } + } + + bio->bi_status =3D errno_to_blk_status(error); + set_bit(R1BIO_Uptodate, &r1_bio->state); + raid_end_bio_io(r1_bio); } =20 static bool raid1_make_request(struct mddev *mddev, struct bio *bio) --=20 2.31.1