回复: [PATCH] btrfs: remove BTRFS_REF_LAST from btrfs_ref_type

[李扬韬]

> History please.

Did you mean change commit msg to below?

	Commit b28b1f0ce44c ("btrfs: delayed-ref: Introduce better documented delayed ref structures") introduce BTRFS_REF_LAST but never use it,
	So let's remove it.

> The _LAST or _NR suffix can be utilized to do sanity checks, and this is not part of the on-disk format.

IIRC, delayed ref belongs to the extent tree memory kv cache.

> And if this exposed by some automatic tools, please also mention it.

I'm just looking at this code.

Thx,
Yangtao