[PATCH 0/15] copy offload patches

From: Mikulas Patocka
Date: Thu Dec 10 2015 - 12:30:06 EST


This patch series adds copy offload (the XCOPY command) to the block
layer, SCSI subsystems and device mapper.

The principle of operation is this:

We create two bios with REQ_COPY flag, one for read and one for write. The
bios have no data pages and they both point to the same bio_copy
structure. The bios may be submitted to the same logical volume or to
different logical volumes. The bios go independently through the device
mapper stack and when they both reach the physical device (the function
blk_queue_bio), the bio pair is collected and the XCOPY request is sent to
the SCSI device.

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