tree a23f0ac6995d3cf5e753998e26107beb8337bf3e
parent db1d607d3ca5cbb283cbb17d648cd7e8dc67cc7b
author Josef Bacik <jbacik@fusionio.com> 1364326305 -0400
committer Josef Bacik <jbacik@fusionio.com> 1364478689 -0400

Btrfs: limit the global reserve to 512mb

A user reported a problem where he was getting early ENOSPC with hundreds of
gigs of free data space and 6 gigs of free metadata space.  This is because the
global block reserve was taking up the entire free metadata space.  This is
ridiculous, we have infrastructure in place to throttle if we start using too
much of the global reserve, so instead of letting it get this huge just limit it
to 512mb so that users can still get work done.  This allowed the user to
complete his rsync without issues.  Thanks

Cc: stable@vger.kernel.org
Reported-and-tested-by: Stefan Priebe <s.priebe@profihost.ag>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>