From e1df36d2f18254d0690a0fbe036cece74ec311b8 Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Thu, 12 Feb 2009 09:45:08 -0500
Subject: [PATCH] Btrfs: don't clean old snapshots on sync(1)

Cleaning old snapshots can make sync(1) somewhat slow, and some users
and applications still use it in a global fsync kind of workload.

This patch changes btrfs not to clean old snapshots during sync, which is
safe from a FS consistency point of view.  The major downside is that it
makes it difficult to tell when old snapshots have been reaped and
the space they were using has been reclaimed.  A new ioctl will be added
for this purpose instead.

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