[PATCH 6.12.y 4/8] rxrpc: Allow the app to store private data on peer structs
From: Sasha Levin <sashal@kernel.org>
Date: 2026-07-30 01:02:13
Also in:
linux-fsdevel, stable
Subsystem:
networking [general], rxrpc sockets (af_rxrpc), the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Howells, Marc Dionne, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2026-07-30 · [PATCH 6.12.y 4/8] rxrpc: Allow the app to store private data on peer structs · Sasha Levin <sashal@kernel.org>
From: David Howells <dhowells@redhat.com> [ Upstream commit f3a123b25429dc03508e3bf598373005220b7203 ] Provide a way for the application (e.g. the afs filesystem) to store private data on the rxrpc_peer structs for later retrieval via the call object. This will allow afs to store a pointer to the afs_server object on the rxrpc_peer struct, thereby obviating the need for afs to keep lookup tables by which it can associate an incoming call with server that transmitted it. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: Jakub Kicinski <kuba@kernel.org> cc: "David S. Miller" <davem@davemloft.net> cc: Eric Dumazet <edumazet@google.com> cc: Paolo Abeni <pabeni@redhat.com> cc: Simon Horman <horms@kernel.org> cc: linux-afs@lists.infradead.org cc: linux-fsdevel@vger.kernel.org cc: netdev@vger.kernel.org Link: https://lore.kernel.org/r/20250224234154.2014840-13-dhowells@redhat.com/ (local) # v1 Link: https://lore.kernel.org/r/20250310094206.801057-9-dhowells@redhat.com/ (local) # v4 Stable-dep-of: 55e841836c6f ("afs: Fix lack of locking around modifications of net->cells_dyn_ino") Signed-off-by: Sasha Levin <sashal@kernel.org> --- include/net/af_rxrpc.h | 2 ++ net/rxrpc/ar-internal.h | 1 + net/rxrpc/peer_object.c | 26 ++++++++++++++++++++++++++ 3 files changed, 29 insertions(+)
diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h
index 0754c463224a43..cf793d18e5df51 100644
--- a/include/net/af_rxrpc.h
+++ b/include/net/af_rxrpc.h@@ -69,6 +69,8 @@ struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer); struct rxrpc_peer *rxrpc_kernel_get_call_peer(struct socket *sock, struct rxrpc_call *call); const struct sockaddr_rxrpc *rxrpc_kernel_remote_srx(const struct rxrpc_peer *peer); const struct sockaddr *rxrpc_kernel_remote_addr(const struct rxrpc_peer *peer); +unsigned long rxrpc_kernel_set_peer_data(struct rxrpc_peer *peer, unsigned long app_data); +unsigned long rxrpc_kernel_get_peer_data(const struct rxrpc_peer *peer); unsigned int rxrpc_kernel_get_srtt(const struct rxrpc_peer *); int rxrpc_kernel_charge_accept(struct socket *, rxrpc_notify_rx_t, rxrpc_user_attach_call_t, unsigned long, gfp_t,
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 61dd1298124f62..346fb8fa2cafcd 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h@@ -334,6 +334,7 @@ struct rxrpc_peer { struct hlist_head error_targets; /* targets for net error distribution */ struct rb_root service_conns; /* Service connections */ struct list_head keepalive_link; /* Link in net->peer_keepalive[] */ + unsigned long app_data; /* Application data (e.g. afs_server) */ unsigned int last_tx_at; /* Last time packet sent here (time64_t LSW) */ seqlock_t service_conn_lock; spinlock_t lock; /* access lock */
diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c
index 956fc7ea4b7346..5664469fdd0c77 100644
--- a/net/rxrpc/peer_object.c
+++ b/net/rxrpc/peer_object.c@@ -509,3 +509,29 @@ const struct sockaddr *rxrpc_kernel_remote_addr(const struct rxrpc_peer *peer) (peer ? &peer->srx.transport : &rxrpc_null_addr.transport); } EXPORT_SYMBOL(rxrpc_kernel_remote_addr); + +/** + * rxrpc_kernel_set_peer_data - Set app-specific data on a peer. + * @peer: The peer to alter + * @app_data: The data to set + * + * Set the app-specific data on a peer. AF_RXRPC makes no effort to retain + * anything the data might refer to. The previous app_data is returned. + */ +unsigned long rxrpc_kernel_set_peer_data(struct rxrpc_peer *peer, unsigned long app_data) +{ + return xchg(&peer->app_data, app_data); +} +EXPORT_SYMBOL(rxrpc_kernel_set_peer_data); + +/** + * rxrpc_kernel_get_peer_data - Get app-specific data from a peer. + * @peer: The peer to query + * + * Retrieve the app-specific data from a peer. + */ +unsigned long rxrpc_kernel_get_peer_data(const struct rxrpc_peer *peer) +{ + return peer->app_data; +} +EXPORT_SYMBOL(rxrpc_kernel_get_peer_data);
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2.53.0