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md: make sure manual changes to recovery checkpoint are saved.

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If you make an array bigger but suppress resync of the new region with
  mdadm --grow /dev/mdX --size=max --assume-clean

then stop the array before anything is written to it, the effect of
the "--assume-clean" is lost and the array will resync the new space
when restarted.
So ensure that we update the metadata in the case.

Reported-by: Sebastian Riemer <sebastian.riemer@profitbricks.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-10-11 14:22:17 +11:00
parent 91502f099d
commit db07d85ef6
1 changed files with 2 additions and 0 deletions
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2
drivers/md/md.c
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@ -3782,6 +3782,8 @@ resync_start_store(struct mddev *mddev, const char *buf, size_t len)
return -EINVAL;
mddev->recovery_cp = n;
if (mddev->pers)
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
return len;
}
static struct md_sysfs_entry md_resync_start =