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authorbingjingc <bingjingc@synology.com>2017-11-17 10:57:44 +0800
committerShaohua Li <shli@fb.com>2017-12-01 11:27:32 -0800
commitaff69d89bdebc39235cddb4445371eb979b49685 (patch)
tree9cf208c4b30fb844b3fe8a1c1f1dd2121976d53a /drivers/md
parenta0651c7fa2c088a605f63792279859608ed7f2c8 (diff)
downloadlinux-aff69d89bdebc39235cddb4445371eb979b49685.tar.bz2
md/raid5: correct degraded calculation in raid5_error
When disk failure occurs on new disks for reshape, mddev->degraded is not calculated correctly. Faulty bit of the failure device is not set before raid5_calc_degraded(conf). mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/loop[012] mdadm /dev/md0 -a /dev/loop3 mdadm /dev/md0 --grow -n4 mdadm /dev/md0 -f /dev/loop3 # simulating disk failure cat /sys/block/md0/md/degraded # it outputs 0, but it should be 1. However, mdadm -D /dev/md0 will show that it is degraded. It's a bug. It can be fixed by moving the resources raid5_calc_degraded() depends on before it. Reported-by: Roy Chung <roychung@synology.com> Reviewed-by: Alex Wu <alexwu@synology.com> Signed-off-by: BingJing Chang <bingjingc@synology.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/raid5.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 31dc25e2871a..98ce4272ace9 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -2677,13 +2677,13 @@ static void raid5_error(struct mddev *mddev, struct md_rdev *rdev)
pr_debug("raid456: error called\n");
spin_lock_irqsave(&conf->device_lock, flags);
+ set_bit(Faulty, &rdev->flags);
clear_bit(In_sync, &rdev->flags);
mddev->degraded = raid5_calc_degraded(conf);
spin_unlock_irqrestore(&conf->device_lock, flags);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(Blocked, &rdev->flags);
- set_bit(Faulty, &rdev->flags);
set_mask_bits(&mddev->sb_flags, 0,
BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING));
pr_crit("md/raid:%s: Disk failure on %s, disabling device.\n"