The patch series covers the points discussed in November 2021 virtual call [LSF/MM/BFP TOPIC] Storage: Copy Offload[0]. We have covered the Initial agreed requirements in this patchset. Patchset borrows Mikulas's token based approach for 2 bdev implementation. Overall series supports – 1. Driver - NVMe Copy command (single NS), including support in nvme-target (for block and file backend) 2. Block layer - Block-generic copy (REQ_COPY flag), with interface accommodating two block-devs, and multi-source/destination interface - Emulation, when offload is natively absent - dm-linear support (for cases not requiring split) 3. User-interface - new ioctl 4. In-kernel user - dm-kcopyd [0] https://lore.kernel.org/linux-nvme/CA+1E3rJ7BZ7LjQXXTdX+-0Edz=zT14mmPGMiVCzUgB33C60tbQ@xxxxxxxxxxxxxx/ Changes in v3: - fixed possible race condition reported by Damien Le Moal - new sysfs controls as suggested by Damien Le Moal - fixed possible memory leak reported by Dan Carpenter, lkp - minor fixes Arnav Dawn (1): nvmet: add copy command support for bdev and file ns Nitesh Shetty (6): block: Introduce queue limits for copy-offload support block: Add copy offload support infrastructure block: Introduce a new ioctl for copy block: add emulation for copy dm: Add support for copy offload. dm: Enable copy offload for dm-linear target SelvaKumar S (3): block: make bio_map_kern() non static nvme: add copy offload support dm kcopyd: use copy offload support block/blk-lib.c | 346 ++++++++++++++++++++++++++++++ block/blk-map.c | 2 +- block/blk-settings.c | 59 +++++ block/blk-sysfs.c | 138 ++++++++++++ block/blk.h | 2 + block/ioctl.c | 32 +++ drivers/md/dm-kcopyd.c | 55 ++++- drivers/md/dm-linear.c | 1 + drivers/md/dm-table.c | 45 ++++ drivers/md/dm.c | 6 + drivers/nvme/host/core.c | 119 +++++++++- drivers/nvme/host/fc.c | 4 + drivers/nvme/host/nvme.h | 7 + drivers/nvme/host/pci.c | 9 + drivers/nvme/host/rdma.c | 6 + drivers/nvme/host/tcp.c | 8 + drivers/nvme/host/trace.c | 19 ++ drivers/nvme/target/admin-cmd.c | 8 +- drivers/nvme/target/io-cmd-bdev.c | 65 ++++++ drivers/nvme/target/io-cmd-file.c | 48 +++++ include/linux/blk_types.h | 21 ++ include/linux/blkdev.h | 17 ++ include/linux/device-mapper.h | 5 + include/linux/nvme.h | 43 +++- include/uapi/linux/fs.h | 23 ++ 25 files changed, 1074 insertions(+), 14 deletions(-) base-commit: 23a3fe5e6bb58304e662c604b86bc1264453e888 -- 2.30.0-rc0
