Change Details

In path_to_dp, if the 'mounted device' for the path is devfs, then we know the path passed in a path to a device, and not a path to a filesystem. Detect this case so we get the device-path of the raw device. Sponsored by: Netflix

In path_to_dp, allow passing in either the actual device path "eg /dev/foo/bar" or the path where the device is mounted (say /mnt/baz/bing). In the former case we'll assume the path within the device is nothing (the relpath). In the latter, we'll take from the mount point on down as the relpath. Sponsored by: Netflix

In path_to_dp, if the 'mounted device' foallow passing in either the path isactual devfs, then weice path "eg know the path passed in a path to a/dev/foo/bar" or the path where the device, and not a path to a is mounted (say filesystem/mnt/baz/bing). Detect thisIn the former case so we get the device-we'll assume the path of the rawwithin the device is nothing (the relpath). In the latter, we'll take from the mount point on down as the relpath. Sponsored by: Netflix