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