[RFC 0/3] Btrfs checksum offload

[Keith Busch]

On Wed, Jan 29, 2025 at 07:32:04PM +0530, Kanchan Joshi wrote:
> There is value in avoiding Copy-on-write (COW) checksum tree on
> a device that can anyway store checksums inline (as part of PI).
> This would eliminate extra checksum writes/reads, making I/O
> more CPU-efficient.

Another potential benefit: if the device does the checksum, then I think
btrfs could avoid the stable page writeback overhead and let the
contents be changable all the way until it goes out on the wire.

Though I feel the very specific device format constraints that can
support an offload like this are a unfortunate.