diff options
| author | J. Bruce Fields <bfields@redhat.com> | 2010-12-08 19:48:19 +0100 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2011-01-11 21:04:10 +0100 |
| commit | f0418aa4b1103f959d64dc18273efa04ee0140e9 (patch) | |
| tree | 01457cfe70d614dcdb12759247212602c2c2c008 /net/sunrpc | |
| parent | rpc: keep backchannel xprt as long as server connection (diff) | |
| download | linux-f0418aa4b1103f959d64dc18273efa04ee0140e9.tar.xz linux-f0418aa4b1103f959d64dc18273efa04ee0140e9.zip | |
rpc: allow xprt_class->setup to return a preexisting xprt
This allows us to reuse the xprt associated with a server connection if
one has already been set up.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprt.c | 3 | ||||
| -rw-r--r-- | net/sunrpc/xprtsock.c | 18 |
2 files changed, 12 insertions, 9 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 749ad15ae305..856274d7e85c 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -1102,6 +1102,9 @@ found: -PTR_ERR(xprt)); return xprt; } + if (test_and_set_bit(XPRT_INITIALIZED, &xprt->state)) + /* ->setup returned a pre-initialized xprt: */ + return xprt; spin_lock_init(&xprt->transport_lock); spin_lock_init(&xprt->reserve_lock); diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 0ef4dd4414ec..ee091c869fcd 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -2359,6 +2359,15 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) struct svc_sock *bc_sock; struct rpc_xprt *ret; + if (args->bc_xprt->xpt_bc_xprt) { + /* + * This server connection already has a backchannel + * export; we can't create a new one, as we wouldn't be + * able to match replies based on xid any more. So, + * reuse the already-existing one: + */ + return args->bc_xprt->xpt_bc_xprt; + } xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); if (IS_ERR(xprt)) return xprt; @@ -2397,15 +2406,6 @@ static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) xprt->address_strings[RPC_DISPLAY_PROTO]); /* - * The backchannel uses the same socket connection as the - * forechannel - */ - if (args->bc_xprt->xpt_bc_xprt) { - /* XXX: actually, want to catch this case... */ - ret = ERR_PTR(-EINVAL); - goto out_err; - } - /* * Once we've associated a backchannel xprt with a connection, * we want to keep it around as long as long as the connection * lasts, in case we need to start using it for a backchannel |