This is a note to let you know that I've just added the patch titled
md/raid1: free the r1bio before waiting for blocked rdev
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid1-free-the-r1bio-before-waiting-for-blocked-r.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a3ad07d093466d55c5c7bb1a91a8500838bd0cc5
Author: Xueshi Hu <xueshi.hu@xxxxxxxxxx>
Date: Mon Aug 14 21:53:55 2023 +0800
md/raid1: free the r1bio before waiting for blocked rdev
[ Upstream commit 992db13a4aee766c8bfbf046ad15c2db5fa7cab8 ]
Raid1 reshape will change mempool and r1conf::raid_disks which are
needed to free r1bio. allow_barrier() make a concurrent raid1_reshape()
possible. So, free the in-flight r1bio before waiting blocked rdev.
Fixes: 6bfe0b499082 ("md: support blocking writes to an array on device failure")
Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Signed-off-by: Xueshi Hu <xueshi.hu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230814135356.1113639-3-xueshi.hu@xxxxxxxxxx
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 0f8b1fb3d0517..530a53aafc122 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1341,6 +1341,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
*/
wait_barrier(conf, bio->bi_iter.bi_sector);
+ retry_write:
r1_bio = alloc_r1bio(mddev, bio);
r1_bio->sectors = max_write_sectors;
@@ -1362,7 +1363,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
*/
disks = conf->raid_disks * 2;
- retry_write:
blocked_rdev = NULL;
rcu_read_lock();
max_sectors = r1_bio->sectors;
@@ -1433,7 +1433,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
for (j = 0; j < i; j++)
if (r1_bio->bios[j])
rdev_dec_pending(conf->mirrors[j].rdev, mddev);
- r1_bio->state = 0;
+ free_r1bio(r1_bio);
allow_barrier(conf, bio->bi_iter.bi_sector);
raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk);
md_wait_for_blocked_rdev(blocked_rdev, mddev);
