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Btrfs: limit the global reserve to 512mb
commit fdf30d1 upstream. 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 Reported-and-tested-by: Stefan Priebe <email@example.com> Signed-off-by: Josef Bacik <firstname.lastname@example.org> Signed-off-by: Greg Kroah-Hartman <email@example.com>
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