From: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
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 v3:
- Rename functions and objects to make future expansion easier
- Put files under /sys/kernel/sunrpc/client/ instead of
/sys/kernel/sunrpc/net/, again for future expansions
- Clean up use of WARN_ON_ONCE() in xs_connect()
- Fix up locking, reference counting, and RCU usage
- Unconditionally create files so userspace tools don't need to guess
what is supported (We return an error message now instead)
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 client/ 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 | 191 ++++++++++++++++++++++++++++++++++++
net/sunrpc/sysfs.h | 20 ++++
net/sunrpc/xprtsock.c | 2 +-
7 files changed, 227 insertions(+), 2 deletions(-)
create mode 100644 net/sunrpc/sysfs.c
create mode 100644 net/sunrpc/sysfs.h
--
2.29.2
