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| author | David Howells <dhowells@redhat.com> | 2019-05-09 08:21:21 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2019-05-16 16:25:20 +0100 |
| commit | b960a34b73e4c1c972623bc2076e24b97588d09e (patch) | |
| tree | b7fafd6110ffa1aed594d55097755eea65da5d8d /Documentation | |
| parent | 0ab4c9594812c4bc5606daf0677ae304bf7ec8c8 (diff) | |
| download | linux-b960a34b73e4c1c972623bc2076e24b97588d09e.tar.bz2 | |
rxrpc: Allow the kernel to mark a call as being non-interruptible
Allow kernel services using AF_RXRPC to indicate that a call should be
non-interruptible. This allows kafs to make things like lock-extension and
writeback data storage calls non-interruptible.
If this is set, signals will be ignored for operations on that call where
possible - such as waiting to get a call channel on an rxrpc connection.
It doesn't prevent UDP sendmsg from being interrupted, but that will be
handled by packet retransmission.
rxrpc_kernel_recv_data() isn't affected by this since that never waits,
preferring instead to return -EAGAIN and leave the waiting to the caller.
Userspace initiated calls can't be set to be uninterruptible at this time.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/networking/rxrpc.txt | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt index ff035a6418e3..180e07d956a7 100644 --- a/Documentation/networking/rxrpc.txt +++ b/Documentation/networking/rxrpc.txt @@ -796,7 +796,9 @@ The kernel interface functions are as follows: s64 tx_total_len, gfp_t gfp, rxrpc_notify_rx_t notify_rx, - bool upgrade); + bool upgrade, + bool intr, + unsigned int debug_id); This allocates the infrastructure to make a new RxRPC call and assigns call and connection numbers. The call will be made on the UDP port that @@ -824,6 +826,13 @@ The kernel interface functions are as follows: the server upgrade the service to a better one. The resultant service ID is returned by rxrpc_kernel_recv_data(). + intr should be set to true if the call should be interruptible. If this + is not set, this function may not return until a channel has been + allocated; if it is set, the function may return -ERESTARTSYS. + + debug_id is the call debugging ID to be used for tracing. This can be + obtained by atomically incrementing rxrpc_debug_id. + If this function is successful, an opaque reference to the RxRPC call is returned. The caller now holds a reference on this and it must be properly ended. |