From b30757178dad19a0388d958ff9eea66e674d39ed Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 22 Apr 2008 09:22:07 -0400
Subject: [PATCH] Btrfs: Add a special device list for chunk allocations

This allows other code that needs to walk every device in the FS to do so
without locking against allocations.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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