[dm-devel] [PATCH 07/33] libmultipath: fall back to search paths by devt

[Martin Wilck]

From: Hannes Reinecke <hare at suse.de>

When removing path the device might already be gone from sysfs,
so we cannot lookup the device name. However, we still should
have the path vector available, so we should be trying to look
it up by using the device number.


Signed-off-by: Hannes Reinecke <hare at suse.com>
---
 libmultipath/discovery.c | 11 +++++++++--
 libmultipath/dmparser.c  | 11 +++++++----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 4e99845e..e4186de1 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -120,8 +120,15 @@ path_discover (vector pathvec, struct config * conf,
 
 	pp = find_path_by_dev(pathvec, (char *)devname);
 	if (!pp) {
-		return store_pathinfo(pathvec, conf,
-				      udevice, flag, NULL);
+		char devt[BLK_DEV_SIZE];
+		dev_t devnum = udev_device_get_devnum(udevice);
+
+		snprintf(devt, BLK_DEV_SIZE, "%d:%d",
+			 major(devnum), minor(devnum));
+		pp = find_path_by_devt(pathvec, devt);
+		if (!pp)
+			return store_pathinfo(pathvec, conf,
+					      udevice, flag, NULL);
 	}
 	return pathinfo(pp, conf, flag);
 }
diff --git a/libmultipath/dmparser.c b/libmultipath/dmparser.c
index b504961f..274eb947 100644
--- a/libmultipath/dmparser.c
+++ b/libmultipath/dmparser.c
@@ -330,12 +330,15 @@ int disassemble_map(vector pathvec, char *params, struct multipath *mpp,
 			if (devt2devname(devname, FILE_NAME_SIZE, word)) {
 				condlog(2, "%s: cannot find block device",
 					word);
-				FREE(word);
-				continue;
+				devname[0] = '\0';
 			}
 
-			if (pathvec)
-				pp = find_path_by_dev(pathvec, devname);
+			if (pathvec) {
+				if (strlen(devname))
+					pp = find_path_by_dev(pathvec, devname);
+				else
+					pp = find_path_by_devt(pathvec, word);
+			}
 
 			if (!pp) {
 				pp = alloc_path();
-- 
2.11.0