find_free_devnum: avoid auto-using names in /etc/mdadm.conf

high-number names like "/dev/md126" shouldn't be in /etc/mdadm.conf,
but if they are they should be ignored when choosing an
unused number.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/util.c b/util.c
index ac0f78c..83f3187 100644
--- a/util.c
+++ b/util.c
@@ -796,10 +796,14 @@ int find_free_devnum(int use_partitions)
 	     devnum = devnum ? devnum-1 : (1<<20)-1) {
 		char *dn;
 		int _devnum;
+		char nbuf[50];
 
 		_devnum = use_partitions ? (-1-devnum) : devnum;
 		if (mddev_busy(_devnum))
 			continue;
+		sprintf(nbuf, "%s%d", use_partitions?"mdp":"md", devnum);
+		if (!conf_name_is_free(nbuf))
+			continue;
 		/* make sure it is new to /dev too, at least as a
 		 * non-standard */
 		dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0);