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rxrpc: Support service upgrade from a kernel service

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Provide support for a kernel service to make use of the service upgrade
facility.  This involves:

 (1) Pass an upgrade request flag to rxrpc_kernel_begin_call().

 (2) Make rxrpc_kernel_recv_data() return the call's current service ID so
     that the caller can detect service upgrade and see what the service
     was upgraded to.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2017-10-18 11:36:39 +01:00
parent 8a5f2166a6
commit a68f4a27f5
6 changed files with 34 additions and 10 deletions
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fs/afs/internal.h
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@@ -100,6 +100,7 @@ struct afs_call {
bool send_pages; /* T if data from mapping should be sent */
bool need_attention; /* T if RxRPC poked us */
bool async; /* T if asynchronous */
bool upgrade; /* T to request service upgrade */
u16 service_id; /* RxRPC service ID to call */
__be16 port; /* target UDP port */
u32 operation_ID; /* operation ID for an incoming call */