Damien,

On 1/11/21 20:26, Chaitanya Kulkarni wrote:

Hi,

NVMeOF Host is capable of handling the NVMe Protocol based Zoned Block
Devices (ZBD) in the Zoned Namespaces (ZNS) mode with the passthru
backend. There is no support for a generic block device backend to
handle the ZBD devices which are not NVMe protocol compliant.

This adds support to export the ZBDs (which are not NVMe drives) to host
the from target via NVMeOF using the host side ZNS interface.

The patch series is generated in bottom-top manner where, it first adds
prep patch and ZNS command-specific handlers on the top of genblk and 
updates the data structures, then one by one it wires up the admin cmds
in the order host calls them in namespace initializing sequence. Once
everything is ready, it wires-up the I/O command handlers. See below for
patch-series overview.

All the testcases are passing for the ZoneFS where ZBD exported with
NVMeOF backed by null_blk ZBD and null_blk ZBD without NVMeOF. Adding
test result below.

Note: This patch-series is based on the earlier posted patch series :-

[PATCH V2 0/4] nvmet: admin-cmd related cleanups and a fix
http://lists.infradead.org/pipermail/linux-nvme/2021-January/021729.html

-ck

thanks a lot or your comments, I'll send a V10 with fixes for your comments.