[PATCH v4 00/10] Add Copy offload support

[Nitesh Shetty]

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@xxxxxxxxxxxxxx/

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