On 8/11/23 03:52, Nitesh Shetty wrote:
We achieve copy offload by sending 2 bio's with source and destination
info and merge them to form a request. This request is sent to driver.
So this design works only for request based storage drivers.
[ ... ]
Overall series supports:
========================
1. Driver
- NVMe Copy command (single NS, TP 4065), including support
in nvme-target (for block and file back end).
2. Block layer
- Block-generic copy (REQ_OP_COPY_DST/SRC), operation with
interface accommodating two block-devs
- Merging copy requests in request layer
- Emulation, for in-kernel user when offload is natively
absent
- dm-linear support (for cases not requiring split)
3. User-interface
- copy_file_range
Is this sufficient? The combination of dm-crypt, dm-linear and the NVMe
driver is very common. What is the plan for supporting dm-crypt?
Shouldn't bio splitting be supported for dm-linear?
Thanks,
Bart.
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