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btrfs: drop log root for dropped roots
If we fsync on a subvolume and create a log root for that volume, and then later delete that subvolume we'll never clean up its log root. Fix this by making switch_commit_roots free the log for any dropped roots we encounter. The extra churn is because we need a btrfs_trans_handle, not the btrfs_transaction. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
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Josef Bacik
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David Sterba
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Jan 23, 2020
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