I want to ensure Dan is aware of this work. Thanks for posting, Anna!

On Feb 2, 2021, at 1:42 PM, schumaker.anna@gmail.com wrote:

From: Anna Schumaker <redacted>

It's possible for an NFS server to go down but come back up with a
different IP address. These patches provide a way for administrators to
handle this issue by providing a new IP address for xprt sockets to
connect to.

Chuck has suggested some ideas for future work that could also use this
interface, such as:
- srcaddr: To move between network devices on the client
- type: "tcp", "rdma", "local"
- bound: 0 for autobind, or the result of the most recent rpcbind query
- connected: either true or false
- last: read-only timestamp of the last operation to use the transport
- device: A symlink to the physical network device

Changes in v2:
- Put files under /sys/kernel/sunrpc/ instead of /sys/net/sunrpc/
- Rename file from "address" to "dstaddr"

Thoughts?
Anna


Anna Schumaker (5):
 sunrpc: Create a sunrpc directory under /sys/kernel/
 sunrpc: Create a net/ subdirectory in the sunrpc sysfs
 sunrpc: Create per-rpc_clnt sysfs kobjects
 sunrpc: Prepare xs_connect() for taking NULL tasks
 sunrpc: Create a per-rpc_clnt file for managing the destination IP
   address

include/linux/sunrpc/clnt.h |   1 +
net/sunrpc/Makefile         |   2 +-
net/sunrpc/clnt.c           |   5 ++
net/sunrpc/sunrpc_syms.c    |   8 ++
net/sunrpc/sysfs.c          | 168 ++++++++++++++++++++++++++++++++++++
net/sunrpc/sysfs.h          |  22 +++++
net/sunrpc/xprtsock.c       |   3 +-
7 files changed, 207 insertions(+), 2 deletions(-)
create mode 100644 net/sunrpc/sysfs.c
create mode 100644 net/sunrpc/sysfs.h

-- 
2.29.2

--
Chuck Lever