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Add ability to label md(4) devices.

Description

Add ability to label md(4) devices.

This feature comes from the fact that we rely memory-backed md(4)
in our build process heavily. However, if the build goes haywire
the allocated resources (i.e. swap and memory-backed md(4)'s) need
to be purged. It is extremely useful to have ability to attach
arbitrary labels to each of the virtual disks so that they can
be identified and GC'ed if neecessary.

MFC after: 4 weeks
Differential Revision: https://reviews.freebsd.org/D10457

Details

Provenance
sobomaxAuthored on
Differential Revision
D10457: Add ability to label md(4) devices
Parents
rS322968: Increase the Amazon EC2 AMI image size from 2GB to 3GB to prevent
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