tree 8ec533cfbe40ad80859408561a3623f8b24b909b
parent f8e5f9f2ed1a383d5726d4e55a40c7e6f9bc9744
author Paul Taysom <taysom@chromium.org> 1346340812 -0700
committer Gerrit <chrome-bot@google.com> 1348618108 -0700

Modified rootdev to handle stacked device mappers

Rootdev only went down one level when traversing the device tree.
With the addition of the bootcache device mapper, we need to
go multiple levels for the -s option for rootdev.

BUG=chromium-os:25441
TEST=used it with bootcache to find boot device.

Change-Id: Ica82dc150e403d0e49e4d8074c0b920b20e4cccc
Reviewed-on: https://gerrit.chromium.org/gerrit/31851
Commit-Ready: Paul Taysom <taysom@chromium.org>
Reviewed-by: Paul Taysom <taysom@chromium.org>
Tested-by: Paul Taysom <taysom@chromium.org>