From 77b72fa828132a35c8b2e08d3fb07eea80b11895 Mon Sep 17 00:00:00 2001
From: allenpeng <allenpeng@synology.com>
Date: Fri, 12 Jun 2020 17:00:39 +0800
Subject: [PATCH 086/108] mdadm/Grow: prevent md's fd from being occupied
during delayed time
If we start reshaping on md which shares sub-devices with another
resyncing md, it may be forced to wait for others to complete. mdadm
occupies the md's fd during this time, which causes the md can not be
stopped and the filesystem can not be mounted on the md. We can close
md's fd earlier to solve this problem.
Reproducible Steps:
1. create two partitions on sda, sdb, sdc, sdd
2. create raid1 with sda1, sdb1
mdadm -C /dev/md1 --assume-clean -l1 -n2 /dev/sda1 /dev/sdb1
3. create raid5 with sda2, sdb2, sdc2
mdadm -C /dev/md2 --assume-clean -l5 -n3 /dev/sda2 /dev/sdb2 /dev/sdc2
4. start resync at md1
echo repair > /sys/block/md1/md/sync_action
5. reshape raid5 to raid6
mdadm -a /dev/md2 /dev/sdd2
mdadm --grow /dev/md2 -n4 -l6 --backup-file=/root/md2-backup
Now mdadm is occupying the fd of md2, causing md2 unable to be stopped
6.Try to stop md2, an error message shows
mdadm -S /dev/md2
mdadm: Cannot get exclusive access to /dev/md3:Perhaps a running process,
mounted filesystem or active volume group?
Reviewed-by: Alex Wu <alexwu@synology.com>
Reviewed-by: BingJing Chang <bingjingc@synology.com>
Reviewed-by: Danny Shih <dannyshih@synology.com>
Signed-off-by: ChangSyun Peng <allenpeng@synology.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
Grow.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Grow.c b/Grow.c
index 764374f..57db7d4 100644
--- a/Grow.c
+++ b/Grow.c
@@ -3517,6 +3517,7 @@ started:
return 0;
}
+ close(fd);
/* Now we just need to kick off the reshape and watch, while
* handling backups of the data...
* This is all done by a forked background process.
@@ -3569,7 +3570,6 @@ started:
mdstat_wait(30 - (delayed-1) * 25);
} while (delayed);
mdstat_close();
- close(fd);
if (check_env("MDADM_GROW_VERIFY"))
fd = open(devname, O_RDONLY | O_DIRECT);
else
--
2.7.5