On Sat, Aug 04, 2018 at 09:10:54PM +0800, Lu Fengqi wrote:
> After btrfs_qgroup_reserve_meta_prealloc(), num_bytes will be assigned
> again by btrfs_calc_trans_metadata_size(). Therefore, once block_rsv
> fails, we cannot properly free the num_bytes of the previous
> qgroup_reserve.
This does not look like a trivial cleanup at all. There was an unused
parameter, removed in c4c129db5da8f070147f175 ("btrfs: drop unused
parameter qgroup_reserved"), that introduced the bug. This was in this
rc1 so it's a regression and I'll consider pushing it to the 4.18 final.
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