lkml.org 
[lkml]   [2018]   [Oct]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH net-next 9/9] rxrpc: Allow the reply time to be obtained on a client call
    From
    Date
    Allow the epoch value to be queried on a server connection.  This is in the
    rxrpc header of every packet for use in routing and is derived from the
    client's state. It's also not supposed to change unless the client gets
    restarted.

    AFS can make use of this information to deduce whether a fileserver has
    been restarted because the fileserver makes client calls to the filesystem
    driver's cache manager to send notifications (ie. callback breaks) about
    conflicting changes from other clients. These convey the fileserver's own
    epoch value back to the filesystem.

    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    Documentation/networking/rxrpc.txt | 14 ++++++++++++++
    include/net/af_rxrpc.h | 1 +
    net/rxrpc/af_rxrpc.c | 14 ++++++++++++++
    3 files changed, 29 insertions(+)

    diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt
    index 67879992b4c2..605e00cdd6be 100644
    --- a/Documentation/networking/rxrpc.txt
    +++ b/Documentation/networking/rxrpc.txt
    @@ -1080,6 +1080,20 @@ The kernel interface functions are as follows:
    successful, the timestamp will be stored into *_ts and true will be
    returned; false will be returned otherwise.

    + (*) Get remote client epoch.
    +
    + u32 rxrpc_kernel_get_epoch(struct socket *sock,
    + struct rxrpc_call *call)
    +
    + This allows the epoch that's contained in packets of an incoming client
    + call to be queried. This value is returned. The function always
    + successful if the call is still in progress. It shouldn't be called once
    + the call has expired. Note that calling this on a local client call only
    + returns the local epoch.
    +
    + This value can be used to determine if the remote client has been
    + restarted as it shouldn't change otherwise.
    +

    =======================
    CONFIGURABLE PARAMETERS
    diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h
    index c4c912554dee..de587948042a 100644
    --- a/include/net/af_rxrpc.h
    +++ b/include/net/af_rxrpc.h
    @@ -78,6 +78,7 @@ int rxrpc_kernel_retry_call(struct socket *, struct rxrpc_call *,
    int rxrpc_kernel_check_call(struct socket *, struct rxrpc_call *,
    enum rxrpc_call_completion *, u32 *);
    u32 rxrpc_kernel_check_life(struct socket *, struct rxrpc_call *);
    +u32 rxrpc_kernel_get_epoch(struct socket *, struct rxrpc_call *);
    bool rxrpc_kernel_get_reply_time(struct socket *, struct rxrpc_call *,
    ktime_t *);

    diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
    index 2fdd276f6842..013dbcb052e5 100644
    --- a/net/rxrpc/af_rxrpc.c
    +++ b/net/rxrpc/af_rxrpc.c
    @@ -385,6 +385,20 @@ u32 rxrpc_kernel_check_life(struct socket *sock, struct rxrpc_call *call)
    }
    EXPORT_SYMBOL(rxrpc_kernel_check_life);

    +/**
    + * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call.
    + * @sock: The socket the call is on
    + * @call: The call to query
    + *
    + * Allow a kernel service to retrieve the epoch value from a service call to
    + * see if the client at the other end rebooted.
    + */
    +u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call)
    +{
    + return call->conn->proto.epoch;
    +}
    +EXPORT_SYMBOL(rxrpc_kernel_get_epoch);
    +
    /**
    * rxrpc_kernel_check_call - Check a call's state
    * @sock: The socket the call is on
    \
     
     \ /
      Last update: 2018-10-04 15:52    [W:2.296 / U:0.876 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site