On 1/12/23 12:58, Nitesh Shetty wrote:
For the devices which does not support copy, copy emulation is
added. Copy-emulation is implemented by reading from source ranges
into memory and writing to the corresponding destination asynchronously.
For zoned device we maintain a linked list of read submission and try to
submit corresponding write in same order.
Also emulation is used, if copy offload fails or partially completes.
Signed-off-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
Signed-off-by: Vincent Fu <vincent.fu@xxxxxxxxxxx>
Signed-off-by: Anuj Gupta <anuj20.g@xxxxxxxxxxx>
---
block/blk-lib.c | 241 ++++++++++++++++++++++++++++++++++++++++-
block/blk-map.c | 4 +-
include/linux/blkdev.h | 3 +
3 files changed, 245 insertions(+), 3 deletions(-)
I'm not sure if I agree with this one.
You just submitted a patch for device-mapper to implement copy offload,
which (to all intents and purposes) _is_ an emulation.
So why do we need to implement it in the block layer as an emulation?
Or, if we have to, why do we need the device-mapper emulation?
This emulation will be doing the same thing, no?
Cheers,
Hannes
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