Commit 4d484a4a authored Aug 13, 2009 by NeilBrown

md: allow upper limit for resync/reshape to be set when array is read-only



Normally we only allow the upper limit for a reshape to be decreased
when the array not performing a sync/recovery/reshape, otherwise there
could be races.  But if an array is part-way through a reshape when it
is assembled the reshape is started immediately leaving no window
to set an upper bound.

If the array is started read-only, the reshape will be suspended until
the array becomes writable, so that provides a window during which it
is perfectly safe to reduce the upper limit of a reshape.

So: allow the upper limit (sync_max) to be reduced even if the reshape
thread is running, as long as the array is still read-only.

Signed-off-by: NeilBrown <neilb@suse.de>

parent 1a67dde0

drivers/md/md.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -3599,6 +3599,7 @@ max_sync_store(mddev_t mddev, const char buf, size_t len)
		if (max < mddev->resync_min)
		return -EINVAL;
		if (max < mddev->resync_max &&
		mddev->ro == 0 &&
		test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
		return -EBUSY;