Grow: use mdstat_wait to wait for delayed reshape.

Having a fix time for a wait is clumsy and can make us
wait much too long.
So use mdstat_wait and keep the mdstat_fd open.
This requires an 'mdstat_close' so it doesn't stay open
forever.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/mdstat.c b/mdstat.c
index 9ebfc075..8b16d3e8 100644
--- a/mdstat.c
+++ b/mdstat.c
@@ -289,6 +289,13 @@ struct mdstat_ent *mdstat_read(int hold, int start)
 	return rv;
 }
 
+void mdstat_close(void)
+{
+	if (mdstat_fd >= 0)
+		close(mdstat_fd);
+	mdstat_fd = -1;
+}
+
 void mdstat_wait(int seconds)
 {
 	fd_set fds;