Hi all,
The following patchset is intended as an RFC to demonstrate how we could
implement multipathing in NFS.
It adds basic support for attaching multiple RPC transports to a client,
an embryonic policy mechanism for switching tasks across those transports
(with a round-robin policy implementation), as well as helpers to allow
iteration of tasks across all tranports (for instance in order to
support NFSv4.1's BIND_CONN_TO_SESSION).
A lot of polish and finishing touches are missing. For instance, I have yet
to add support in debugfs for these transports, and there is no support
for mounting with NFSv4.1 session trunking. However there is a demonstrator
that implements pNFS multipathing over NFSv3. Adding support for NFSv4.1
requires that you call EXCHANGE_ID to allow verification of the
major/minor server and scopeid fields, which should not be too hard.
More to come, but in the meantime, comments are welcome...
Cheers
Trond
--------------
v2: Fix up kbuild warnings
Trond Myklebust (13):
SUNRPC: Remove unused function rpc_task_reset_client
SUNRPC: Reorder rpc_task to put waitqueue related info in same
cachelines
SUNRPC: Uninline xprt_get(); It isn't performance critical.
SUNRPC: Make freeing of struct xprt rcu-safe
SUNRPC: Add a structure to track multiple transports
SUNRPC: Make rpc_clnt store the multipath iterators
SUNRPC: Use the multipath iterator to assign a transport to each task
SUNRPC: Allow caller to specify the transport to use
SUNRPC: Add a helper to apply a function to all the rpc_clnt's
transports
SUNRPC: Make NFS swap work with multipath
NFSv4.1: nfs4_proc_bind_conn_to_session must iterate over all
connections
SUNRPC: Allow addition of new transports to a struct rpc_clnt
pnfs/NFSv4.1: Add multipath capabilities to pNFS flexfiles servers
over NFSv3
fs/nfs/nfs4proc.c | 51 +++-
fs/nfs/pnfs_nfs.c | 16 +-
include/linux/sunrpc/clnt.h | 18 +-
include/linux/sunrpc/sched.h | 32 +--
include/linux/sunrpc/xprt.h | 22 +-
include/linux/sunrpc/xprtmultipath.h | 69 +++++
net/sunrpc/Makefile | 3 +-
net/sunrpc/auth_gss/auth_gss.c | 4 +-
net/sunrpc/clnt.c | 326 ++++++++++++++++++------
net/sunrpc/rpcb_clnt.c | 10 +-
net/sunrpc/sched.c | 2 +
net/sunrpc/xprt.c | 42 ++--
net/sunrpc/xprtmultipath.c | 473 +++++++++++++++++++++++++++++++++++
net/sunrpc/xprtsock.c | 4 +-
14 files changed, 938 insertions(+), 134 deletions(-)
create mode 100644 include/linux/sunrpc/xprtmultipath.h
create mode 100644 net/sunrpc/xprtmultipath.c
--
2.5.0
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