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 9e530f1a93b8e729cf9aeadfd508bd261928070a..f743e75b4e5dbc81c75c463edd929b2000b6387a 100644 (file)
--- 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)