Btrfs: free csums when we're done scrubbing an extent
A user reported scrub taking up an unreasonable amount of ram as it ran. This is because we lookup the csums for the extent we're scrubbing but don't free it up until after we're done with the scrub, which means we can take up a whole lot of ram. This patch fixes this by dropping the csums once we're done with the extent we've scrubbed. The user reported this to fix their problem. Thanks, Reported-and-tested-by: Remco Hosman <remco@hosman.xs4all.nl> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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