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