Monitor: don't assume mdadm parameter is a block device

If symlink (e.g. /dev/md/raid) is passed as a parameter to mdadm --wait,
it fails as it's not able to find a corresponding entry in /proc/mdstat
output. Get parameter file major:minor and look for block device name in
sysfs. This commit is partial revert of commit 9e04ac1c43e6
("mdadm/util: unify stat checking blkdev into function").

Signed-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/Monitor.c b/Monitor.c
index bef2f1be..48c451c4 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -982,12 +982,21 @@ static void link_containers_with_subarrays(struct state *list)
 int Wait(char *dev)
 {
 	char devnm[32];
+	dev_t rdev;
+	char *tmp;
 	int rv = 1;
 	int frozen_remaining = 3;
 
-	if (!stat_is_blkdev(dev, NULL))
+	if (!stat_is_blkdev(dev, &rdev))
+		return 2;
+
+	tmp = devid2devnm(rdev);
+	if (!tmp) {
+		pr_err("Cannot get md device name.\n");
 		return 2;
-	strcpy(devnm, dev);
+	}
+
+	strcpy(devnm, tmp);
 
 	while(1) {
 		struct mdstat_ent *ms = mdstat_read(1, 0);