a question about multipathd and udev

[dwu <dwu@xxxxxxxxxx>]

If a block device is added, the udev will run the command multipath to 
add the path to the mp if possible.
Why multipathd also process a path addition event:
(!strncmp(uev->action, "add", 3)) {
       r = uev_add_path(devname, vecs);
       goto out;
   }

Thanks.

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