From 2bc5565286121d2a77ccd728eb3484dff2035b58 Mon Sep 17 00:00:00 2001
From: Alexander Block <ablock84@googlemail.com>
Date: Fri, 15 Jun 2012 09:49:33 +0200
Subject: [PATCH] Btrfs: don't update atime on RO subvolumes

Before the update_time inode operation was indroduced, it was
not possible to prevent updates of atime on RO subvolumes. VFS
was only able to check for RO on the mount, but did not know
anything about btrfs subvolumes.

btrfs_update_time does now check if the root is RO and skip
updating of times.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
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