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authorYu Kuai <yukuai3@huawei.com>2024-08-03 17:11:37 +0800
committerSong Liu <song@kernel.org>2024-08-15 13:38:17 -0700
commitc916ca35308d3187c9928664f9be249b22a3a701 (patch)
treeb6555d198877e184e09b9d9b90ddaad51fc77639 /drivers/md
parent7db4042336580dfd75cb5faa82c12cd51098c90b (diff)
md/raid1: Fix data corruption for degraded array with slow disk
read_balance() will avoid reading from slow disks as much as possible, however, if valid data only lands in slow disks, and a new normal disk is still in recovery, unrecovered data can be read: raid1_read_request read_balance raid1_should_read_first -> return false choose_best_rdev -> normal disk is not recovered, return -1 choose_bb_rdev -> missing the checking of recovery, return the normal disk -> read unrecovered data Root cause is that the checking of recovery is missing in choose_bb_rdev(). Hence add such checking to fix the problem. Also fix similar problem in choose_slow_rdev(). Cc: stable@vger.kernel.org Fixes: 9f3ced792203 ("md/raid1: factor out choose_bb_rdev() from read_balance()") Fixes: dfa8ecd167c1 ("md/raid1: factor out choose_slow_rdev() from read_balance()") Reported-and-tested-by: Mateusz Jończyk <mat.jonczyk@o2.pl> Closes: https://lore.kernel.org/all/9952f532-2554-44bf-b906-4880b2e88e3a@o2.pl/ Signed-off-by: Yu Kuai <yukuai3@huawei.com> Link: https://lore.kernel.org/r/20240803091137.3197008-1-yukuai1@huaweicloud.com Signed-off-by: Song Liu <song@kernel.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/raid1.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 7acfe7c9dc8d..761989d67906 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -617,6 +617,12 @@ static int choose_first_rdev(struct r1conf *conf, struct r1bio *r1_bio,
return -1;
}
+static bool rdev_in_recovery(struct md_rdev *rdev, struct r1bio *r1_bio)
+{
+ return !test_bit(In_sync, &rdev->flags) &&
+ rdev->recovery_offset < r1_bio->sector + r1_bio->sectors;
+}
+
static int choose_bb_rdev(struct r1conf *conf, struct r1bio *r1_bio,
int *max_sectors)
{
@@ -635,6 +641,7 @@ static int choose_bb_rdev(struct r1conf *conf, struct r1bio *r1_bio,
rdev = conf->mirrors[disk].rdev;
if (!rdev || test_bit(Faulty, &rdev->flags) ||
+ rdev_in_recovery(rdev, r1_bio) ||
test_bit(WriteMostly, &rdev->flags))
continue;
@@ -673,7 +680,8 @@ static int choose_slow_rdev(struct r1conf *conf, struct r1bio *r1_bio,
rdev = conf->mirrors[disk].rdev;
if (!rdev || test_bit(Faulty, &rdev->flags) ||
- !test_bit(WriteMostly, &rdev->flags))
+ !test_bit(WriteMostly, &rdev->flags) ||
+ rdev_in_recovery(rdev, r1_bio))
continue;
/* there are no bad blocks, we can use this disk */
@@ -733,9 +741,7 @@ static bool rdev_readable(struct md_rdev *rdev, struct r1bio *r1_bio)
if (!rdev || test_bit(Faulty, &rdev->flags))
return false;
- /* still in recovery */
- if (!test_bit(In_sync, &rdev->flags) &&
- rdev->recovery_offset < r1_bio->sector + r1_bio->sectors)
+ if (rdev_in_recovery(rdev, r1_bio))
return false;
/* don't read from slow disk unless have to */