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rxrpc: Make the local endpoint hold a ref on a connected call

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Make the local endpoint and it's I/O thread hold a reference on a connected
call until that call is disconnected.  Without this, we're reliant on
either the AF_RXRPC socket to hold a ref (which is dropped when the call is
released) or a queued work item to hold a ref (the work item is being
replaced with the I/O thread).

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
This commit is contained in:
David Howells 2022-11-02 10:24:29 +00:00
parent 8a758d98db
commit 5040011d07
4 changed files with 23 additions and 13 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
include/trace/events/rxrpc.h
View file

@ -148,6 +148,7 @@
E_(rxrpc_client_to_idle, "->Idle")
#define rxrpc_call_traces \
EM(rxrpc_call_get_io_thread, "GET iothread") \
EM(rxrpc_call_get_input, "GET input ") \
EM(rxrpc_call_get_kernel_service, "GET krnl-srv") \
EM(rxrpc_call_get_notify_socket, "GET notify ") \
@ -160,6 +161,7 @@
EM(rxrpc_call_new_prealloc_service, "NEW prealloc") \
EM(rxrpc_call_put_discard_prealloc, "PUT disc-pre") \
EM(rxrpc_call_put_discard_error, "PUT disc-err") \
EM(rxrpc_call_put_io_thread, "PUT iothread") \
EM(rxrpc_call_put_input, "PUT input ") \
EM(rxrpc_call_put_kernel, "PUT kernel ") \
EM(rxrpc_call_put_poke, "PUT poke ") \
@ -173,6 +175,7 @@
EM(rxrpc_call_see_activate_client, "SEE act-clnt") \
EM(rxrpc_call_see_connect_failed, "SEE con-fail") \
EM(rxrpc_call_see_connected, "SEE connect ") \
EM(rxrpc_call_see_disconnected, "SEE disconn ") \
EM(rxrpc_call_see_distribute_error, "SEE dist-err") \
EM(rxrpc_call_see_input, "SEE input ") \
EM(rxrpc_call_see_release, "SEE release ") \

2
net/rxrpc/call_object.c
View file

@ -453,6 +453,8 @@ void rxrpc_incoming_call(struct rxrpc_sock *rx,
BUG();
}
rxrpc_get_call(call, rxrpc_call_get_io_thread);
/* Set the channel for this call. We don't get channel_lock as we're
* only defending against the data_ready handler (which we're called
* from) and the RESPONSE packet parser (which is only really

6
net/rxrpc/conn_client.c
View file

@ -725,8 +725,11 @@ int rxrpc_connect_call(struct rxrpc_sock *rx,
rxrpc_discard_expired_client_conns(&rxnet->client_conn_reaper);
rxrpc_get_call(call, rxrpc_call_get_io_thread);
bundle = rxrpc_prep_call(rx, call, cp, srx, gfp);
if (IS_ERR(bundle)) {
rxrpc_put_call(call, rxrpc_call_get_io_thread);
ret = PTR_ERR(bundle);
goto out;
}
@ -820,7 +823,6 @@ void rxrpc_disconnect_client_call(struct rxrpc_bundle *bundle, struct rxrpc_call
_enter("c=%x", call->debug_id);
spin_lock(&bundle->channel_lock);
set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
/* Calls that have never actually been assigned a channel can simply be
* discarded.
@ -912,8 +914,6 @@ void rxrpc_disconnect_client_call(struct rxrpc_bundle *bundle, struct rxrpc_call
out:
spin_unlock(&bundle->channel_lock);
_leave("");
return;
}
/*

13
net/rxrpc/conn_object.c
View file

@ -178,6 +178,9 @@ void rxrpc_disconnect_call(struct rxrpc_call *call)
{
struct rxrpc_connection *conn = call->conn;
set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
rxrpc_see_call(call, rxrpc_call_see_disconnected);
call->peer->cong_ssthresh = call->cong_ssthresh;
if (!hlist_unhashed(&call->error_link)) {
@ -186,18 +189,20 @@ void rxrpc_disconnect_call(struct rxrpc_call *call)
spin_unlock(&call->peer->lock);
}
if (rxrpc_is_client_call(call))
return rxrpc_disconnect_client_call(conn->bundle, call);
if (rxrpc_is_client_call(call)) {
rxrpc_disconnect_client_call(conn->bundle, call);
} else {
spin_lock(&conn->bundle->channel_lock);
__rxrpc_disconnect_call(conn, call);
spin_unlock(&conn->bundle->channel_lock);
set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
conn->idle_timestamp = jiffies;
if (atomic_dec_and_test(&conn->active))
rxrpc_set_service_reap_timer(conn->rxnet,
jiffies + rxrpc_connection_expiry);
}
rxrpc_put_call(call, rxrpc_call_put_io_thread);
}
/*