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authorDavid Howells <dhowells@redhat.com>2017-10-18 11:07:31 +0100
committerDavid Howells <dhowells@redhat.com>2017-10-18 11:42:48 +0100
commitf4d15fb6f99af9b99f688bd87579137be44f85ee (patch)
treecfc9781d2fc813a91f2ce4e5b38794b9dc4dd6bf /net/rxrpc
parenta68f4a27f55f1d54e35c270aff89383da4b1b656 (diff)
downloadlinux-rt-f4d15fb6f99af9b99f688bd87579137be44f85ee.tar.gz
rxrpc: Provide functions for allowing cleaner handling of signals
Provide a couple of functions to allow cleaner handling of signals in a kernel service. They are: (1) rxrpc_kernel_get_rtt() This allows the kernel service to find out the RTT time for a call, so as to better judge how large a timeout to employ. Note, though, that whilst this returns a value in nanoseconds, the timeouts can only actually be in jiffies. (2) rxrpc_kernel_check_life() This returns a number that is updated when ACKs are received from the peer (notably including PING RESPONSE ACKs which we can elicit by sending PING ACKs to see if the call still exists on the server). The caller should compare the numbers of two calls to see if the call is still alive. These can be used to provide an extending timeout rather than returning immediately in the case that a signal occurs that would otherwise abort an RPC operation. The timeout would be extended if the server is still responsive and the call is still apparently alive on the server. For most operations this isn't that necessary - but for FS.StoreData it is: OpenAFS writes the data to storage as it comes in without making a backup, so if we immediately abort it when partially complete on a CTRL+C, say, we have no idea of the state of the file after the abort. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/af_rxrpc.c19
-rw-r--r--net/rxrpc/peer_object.c13
2 files changed, 32 insertions, 0 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 481f7dc90ba2..73c980e26581 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -340,6 +340,25 @@ void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
EXPORT_SYMBOL(rxrpc_kernel_end_call);
/**
+ * rxrpc_kernel_check_life - Check to see whether a call is still alive
+ * @sock: The socket the call is on
+ * @call: The call to check
+ *
+ * Allow a kernel service to find out whether a call is still alive - ie. we're
+ * getting ACKs from the server. Returns a number representing the life state
+ * which can be compared to that returned by a previous call.
+ *
+ * If this is a client call, ping ACKs will be sent to the server to find out
+ * whether it's still responsive and whether the call is still alive on the
+ * server.
+ */
+u32 rxrpc_kernel_check_life(struct socket *sock, struct rxrpc_call *call)
+{
+ return call->acks_latest;
+}
+EXPORT_SYMBOL(rxrpc_kernel_check_life);
+
+/**
* rxrpc_kernel_check_call - Check a call's state
* @sock: The socket the call is on
* @call: The call to check
diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c
index 5787f97f5330..d02a99f37f5f 100644
--- a/net/rxrpc/peer_object.c
+++ b/net/rxrpc/peer_object.c
@@ -411,3 +411,16 @@ void rxrpc_kernel_get_peer(struct socket *sock, struct rxrpc_call *call,
*_srx = call->peer->srx;
}
EXPORT_SYMBOL(rxrpc_kernel_get_peer);
+
+/**
+ * rxrpc_kernel_get_rtt - Get a call's peer RTT
+ * @sock: The socket on which the call is in progress.
+ * @call: The call to query
+ *
+ * Get the call's peer RTT.
+ */
+u64 rxrpc_kernel_get_rtt(struct socket *sock, struct rxrpc_call *call)
+{
+ return call->peer->rtt;
+}
+EXPORT_SYMBOL(rxrpc_kernel_get_rtt);