Grow: don't hold array open while waiting for reshape.

If we will need to change array level when a reshape completes, a copy
of mdadm waits in the background.
Currently this copy hold the device (/dev/mdX) open.  This prevents
the array from being stopped.

So close the file descriptor and re-open after the reshape completes.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/Grow.c b/Grow.c
index b552a3f3..c1ae6e83 100644
--- a/Grow.c
+++ b/Grow.c
@@ -3086,9 +3086,11 @@ static int reshape_array(char *container, int fd, char *devname,
 			map_fork();
 			break;
 		}
+		close(fd);
 		wait_reshape(sra);
-		impose_level(fd, info->new_level, devname, verbose);
-
+		fd = open_dev(sra->sys_name);
+		if (fd >= 0)
+			impose_level(fd, info->new_level, devname, verbose);
 		return 0;
 	case 1: /* Couldn't set data_offset, try the old way */
 		if (data_offset != INVALID_SECTORS) {