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https://github.com/torvalds/linux
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9d35d880e0
Move the connection setup of client calls to the I/O thread so that a whole
load of locking and barrierage can be eliminated. This necessitates the
app thread waiting for connection to complete before it can begin
encrypting data.
This also completes the fix for a race that exists between call connection
and call disconnection whereby the data transmission code adds the call to
the peer error distribution list after the call has been disconnected (say
by the rxrpc socket getting closed).
The fix is to complete the process of moving call connection, data
transmission and call disconnection into the I/O thread and thus forcibly
serialising them.
Note that the issue may predate the overhaul to an I/O thread model that
were included in the merge window for v6.2, but the timing is very much
changed by the change given below.
Fixes: cf37b59875 ("rxrpc: Move DATA transmission into call processor work item")
Reported-by: syzbot+c22650d2844392afdcfd@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Call state changing functions.
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*
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* Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include "ar-internal.h"
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/*
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* Transition a call to the complete state.
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*/
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bool rxrpc_set_call_completion(struct rxrpc_call *call,
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enum rxrpc_call_completion compl,
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u32 abort_code,
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int error)
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{
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if (__rxrpc_call_state(call) == RXRPC_CALL_COMPLETE)
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return false;
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call->abort_code = abort_code;
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call->error = error;
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call->completion = compl;
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/* Allow reader of completion state to operate locklessly */
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rxrpc_set_call_state(call, RXRPC_CALL_COMPLETE);
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trace_rxrpc_call_complete(call);
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wake_up(&call->waitq);
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rxrpc_notify_socket(call);
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return true;
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}
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/*
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* Record that a call successfully completed.
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*/
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bool rxrpc_call_completed(struct rxrpc_call *call)
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{
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return rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
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}
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/*
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* Record that a call is locally aborted.
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*/
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bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
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u32 abort_code, int error, enum rxrpc_abort_reason why)
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{
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trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
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abort_code, error);
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if (!rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
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abort_code, error))
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return false;
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if (test_bit(RXRPC_CALL_EXPOSED, &call->flags))
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rxrpc_send_abort_packet(call);
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return true;
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}
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/*
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* Record that a call errored out before even getting off the ground, thereby
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* setting the state to allow it to be destroyed.
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*/
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void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
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int error)
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{
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call->abort_code = RX_CALL_DEAD;
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call->error = error;
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call->completion = compl;
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call->_state = RXRPC_CALL_COMPLETE;
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trace_rxrpc_call_complete(call);
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WARN_ON_ONCE(__test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags));
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}
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