[PATCH v4 00/10] Add Copy offload support

Nitesh Shetty
2022-04-26T12:38:31Z

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
- copy_file_range for zonefs

4. In-kernel user
- dm-kcopyd
- copy_file_range in zonefs

For zonefs copy_file_range - Seems we cannot levearge fstest here. Limited
testing is done at this point using a custom application for unit testing.

Appreciate the inputs on plumbing and how to test this further?
Perhaps some of it can be discussed during LSF/MM too.

[0] https://lore.kernel.org/linux-nvme/CA+1E3rJ7BZ7LjQXXTdX+-0Edz=zT14mmPGMiVCzUgB33C60tbQ@mail.gmail.com/

Changes in v4:
- added copy_file_range support for zonefs
- added documentaion about new sysfs entries
- incorporated review comments on v3
- minor fixes

Arnav Dawn (2):
nvmet: add copy command support for bdev and file ns
fs: add support for copy file range in zonefs

Nitesh Shetty (7):
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
nvme: add copy offload support
dm: Add support for copy offload.
dm: Enable copy offload for dm-linear target

SelvaKumar S (1):
dm kcopyd: use copy offload support

Documentation/ABI/stable/sysfs-block | 83 +++++++
block/blk-lib.c | 358 +++++++++++++++++++++++++++
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 | 116 ++++++++-
drivers/nvme/host/fc.c | 4 +
drivers/nvme/host/nvme.h | 7 +
drivers/nvme/host/pci.c | 25 ++
drivers/nvme/host/rdma.c | 6 +
drivers/nvme/host/tcp.c | 14 ++
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 | 49 ++++
fs/zonefs/super.c | 178 ++++++++++++-
fs/zonefs/zonefs.h | 1 +
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 ++
28 files changed, 1367 insertions(+), 15 deletions(-)

base-commit: e7d6987e09a328d4a949701db40ef63fbb970670
--
2.35.1.500.gb896f729e2