From: Rafał Miłecki <rafal@milecki.pl>
Date: Thu, 2 Apr 2020 12:12:12 +0000 (+0200)
Subject: Revert "block: mount_action: handle mount/umount deps"
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0b93429329e9f403cf4fc45043b73e3a8d4e8e0d;p=project%2Ffstools.git

Revert "block: mount_action: handle mount/umount deps"

This reverts commit 32c3126b2f0464106d74317336b6aef1d7d5f82f.

Internally stored list of devices is implemented using struct vlist_tree
and keeps devices sorted by their mount target paths. This DOESN'T mean
that all preceding entires of a given device are its parent devices.
Making such an assumption and mounting all preceding devices results in
unwanted mounts in most cases.

For example having devices like:
/dev/sda1 (mount target: /mnt/foo1)
/dev/sda2 (mount target: /mnt/foo2)
/dev/sdb1 (mount target: /mnt/bar1)
/dev/sdb2 (mount target: /mnt/bar2)
will result in devices vlist_tree having entries sorted like:
/dev/sdb1 (bar1), /dev/sdb2 (bar2), /dev/sda1 (foo1), /dev/sda2 (foo2)

Using autofs and accessing /mnt/foo2 would result in mounting all 4
partitions and spinning unneeded /dev/sdb.

Cc: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---

diff --git a/block.c b/block.c
index 9e530f1..f743e75 100644
--- a/block.c
+++ b/block.c
@@ -1202,47 +1202,30 @@ static int umount_device(char *path, int type, bool all)
 
 static int mount_action(char *action, char *device, int type)
 {
-	struct device *the_dev, *dev;
 	char path[32];
 
 	if (!action || !device)
 		return -1;
-
-	if (config_load(NULL))
-		return -1;
-	cache_load(0);
-
-	the_dev = find_block_device(NULL, NULL, device);
+	snprintf(path, sizeof(path), "/dev/%s", device);
 
 	if (!strcmp(action, "remove")) {
 		if (type == TYPE_HOTPLUG)
 			blockd_notify(device, NULL, NULL);
 
-		if (!the_dev || !the_dev->m || the_dev->m->type != TYPE_MOUNT) {
-			snprintf(path, sizeof(path), "/dev/%s", device);
-			umount_device(path, type, true);
-		} else
-			vlist_for_element_to_last_reverse(&devices, the_dev, dev, node)
-				if (dev->m && dev->m->type == TYPE_MOUNT)
-					umount_device(dev->pr->dev, type, true);
+		umount_device(path, type, true);
+
 		return 0;
-	} else if (!strcmp(action, "add")) {
-		if (!the_dev)
-			return -1;
-		if (the_dev->m && the_dev->m->type == TYPE_MOUNT) {
-			vlist_for_first_to_element(&devices, the_dev, dev, node) {
-				if (dev->m && dev->m->type == TYPE_MOUNT) {
-					int err = mount_device(dev, type);
-					if (err)
-						return err;
-				}
-			}
-			return 0;
-		} else
-			return mount_device(the_dev, type);
+	} else if (strcmp(action, "add")) {
+		ULOG_ERR("Unkown action %s\n", action);
+
+		return -1;
 	}
-	ULOG_ERR("Unkown action %s\n", action);
-	return -1;
+
+	if (config_load(NULL))
+		return -1;
+	cache_load(0);
+
+	return mount_device(find_block_device(NULL, NULL, path), type);
 }
 
 static int main_hotplug(int argc, char **argv)