806 строки
19 KiB
C
806 строки
19 KiB
C
/* Maintain an RxRPC server socket to do AFS communications through
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*
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* Copyright (C) 2007 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <rxrpc/packet.h>
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#include "internal.h"
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#include "afs_cm.h"
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struct socket *afs_socket; /* my RxRPC socket */
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static struct workqueue_struct *afs_async_calls;
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static struct afs_call *afs_spare_incoming_call;
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static atomic_t afs_outstanding_calls;
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static void afs_free_call(struct afs_call *);
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static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
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static int afs_wait_for_call_to_complete(struct afs_call *);
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static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
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static int afs_dont_wait_for_call_to_complete(struct afs_call *);
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static void afs_process_async_call(struct work_struct *);
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static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
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static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
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static int afs_deliver_cm_op_id(struct afs_call *);
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/* synchronous call management */
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const struct afs_wait_mode afs_sync_call = {
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.notify_rx = afs_wake_up_call_waiter,
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.wait = afs_wait_for_call_to_complete,
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};
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/* asynchronous call management */
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const struct afs_wait_mode afs_async_call = {
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.notify_rx = afs_wake_up_async_call,
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.wait = afs_dont_wait_for_call_to_complete,
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};
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/* asynchronous incoming call management */
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static const struct afs_wait_mode afs_async_incoming_call = {
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.notify_rx = afs_wake_up_async_call,
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};
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/* asynchronous incoming call initial processing */
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static const struct afs_call_type afs_RXCMxxxx = {
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.name = "CB.xxxx",
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.deliver = afs_deliver_cm_op_id,
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.abort_to_error = afs_abort_to_error,
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};
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static void afs_charge_preallocation(struct work_struct *);
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static DECLARE_WORK(afs_charge_preallocation_work, afs_charge_preallocation);
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static int afs_wait_atomic_t(atomic_t *p)
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{
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schedule();
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return 0;
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}
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/*
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* open an RxRPC socket and bind it to be a server for callback notifications
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* - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
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*/
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int afs_open_socket(void)
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{
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struct sockaddr_rxrpc srx;
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struct socket *socket;
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int ret;
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_enter("");
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ret = -ENOMEM;
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afs_async_calls = alloc_workqueue("kafsd", WQ_MEM_RECLAIM, 0);
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if (!afs_async_calls)
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goto error_0;
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ret = sock_create_kern(&init_net, AF_RXRPC, SOCK_DGRAM, PF_INET, &socket);
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if (ret < 0)
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goto error_1;
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socket->sk->sk_allocation = GFP_NOFS;
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/* bind the callback manager's address to make this a server socket */
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srx.srx_family = AF_RXRPC;
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srx.srx_service = CM_SERVICE;
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srx.transport_type = SOCK_DGRAM;
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srx.transport_len = sizeof(srx.transport.sin);
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srx.transport.sin.sin_family = AF_INET;
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srx.transport.sin.sin_port = htons(AFS_CM_PORT);
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memset(&srx.transport.sin.sin_addr, 0,
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sizeof(srx.transport.sin.sin_addr));
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ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
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if (ret < 0)
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goto error_2;
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rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
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afs_rx_discard_new_call);
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ret = kernel_listen(socket, INT_MAX);
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if (ret < 0)
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goto error_2;
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afs_socket = socket;
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afs_charge_preallocation(NULL);
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_leave(" = 0");
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return 0;
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error_2:
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sock_release(socket);
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error_1:
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destroy_workqueue(afs_async_calls);
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error_0:
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* close the RxRPC socket AFS was using
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*/
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void afs_close_socket(void)
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{
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_enter("");
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if (afs_spare_incoming_call) {
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atomic_inc(&afs_outstanding_calls);
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afs_free_call(afs_spare_incoming_call);
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afs_spare_incoming_call = NULL;
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}
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_debug("outstanding %u", atomic_read(&afs_outstanding_calls));
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wait_on_atomic_t(&afs_outstanding_calls, afs_wait_atomic_t,
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TASK_UNINTERRUPTIBLE);
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_debug("no outstanding calls");
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flush_workqueue(afs_async_calls);
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kernel_sock_shutdown(afs_socket, SHUT_RDWR);
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flush_workqueue(afs_async_calls);
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sock_release(afs_socket);
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_debug("dework");
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destroy_workqueue(afs_async_calls);
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_leave("");
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}
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/*
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* free a call
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*/
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static void afs_free_call(struct afs_call *call)
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{
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_debug("DONE %p{%s} [%d]",
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call, call->type->name, atomic_read(&afs_outstanding_calls));
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ASSERTCMP(call->rxcall, ==, NULL);
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ASSERT(!work_pending(&call->async_work));
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ASSERT(call->type->name != NULL);
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kfree(call->request);
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kfree(call);
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if (atomic_dec_and_test(&afs_outstanding_calls))
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wake_up_atomic_t(&afs_outstanding_calls);
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}
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/*
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* End a call but do not free it
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*/
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static void afs_end_call_nofree(struct afs_call *call)
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{
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if (call->rxcall) {
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rxrpc_kernel_end_call(afs_socket, call->rxcall);
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call->rxcall = NULL;
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}
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if (call->type->destructor)
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call->type->destructor(call);
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}
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/*
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* End a call and free it
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*/
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static void afs_end_call(struct afs_call *call)
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{
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afs_end_call_nofree(call);
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afs_free_call(call);
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}
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/*
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* allocate a call with flat request and reply buffers
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*/
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struct afs_call *afs_alloc_flat_call(const struct afs_call_type *type,
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size_t request_size, size_t reply_max)
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{
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struct afs_call *call;
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call = kzalloc(sizeof(*call), GFP_NOFS);
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if (!call)
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goto nomem_call;
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_debug("CALL %p{%s} [%d]",
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call, type->name, atomic_read(&afs_outstanding_calls));
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atomic_inc(&afs_outstanding_calls);
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call->type = type;
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call->request_size = request_size;
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call->reply_max = reply_max;
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if (request_size) {
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call->request = kmalloc(request_size, GFP_NOFS);
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if (!call->request)
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goto nomem_free;
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}
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if (reply_max) {
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call->buffer = kmalloc(reply_max, GFP_NOFS);
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if (!call->buffer)
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goto nomem_free;
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}
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init_waitqueue_head(&call->waitq);
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return call;
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nomem_free:
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afs_free_call(call);
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nomem_call:
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return NULL;
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}
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/*
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* clean up a call with flat buffer
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*/
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void afs_flat_call_destructor(struct afs_call *call)
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{
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_enter("");
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kfree(call->request);
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call->request = NULL;
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kfree(call->buffer);
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call->buffer = NULL;
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}
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/*
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* attach the data from a bunch of pages on an inode to a call
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*/
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static int afs_send_pages(struct afs_call *call, struct msghdr *msg,
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struct kvec *iov)
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{
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struct page *pages[8];
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unsigned count, n, loop, offset, to;
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pgoff_t first = call->first, last = call->last;
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int ret;
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_enter("");
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offset = call->first_offset;
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call->first_offset = 0;
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do {
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_debug("attach %lx-%lx", first, last);
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count = last - first + 1;
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if (count > ARRAY_SIZE(pages))
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count = ARRAY_SIZE(pages);
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n = find_get_pages_contig(call->mapping, first, count, pages);
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ASSERTCMP(n, ==, count);
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loop = 0;
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do {
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msg->msg_flags = 0;
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to = PAGE_SIZE;
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if (first + loop >= last)
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to = call->last_to;
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else
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msg->msg_flags = MSG_MORE;
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iov->iov_base = kmap(pages[loop]) + offset;
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iov->iov_len = to - offset;
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offset = 0;
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_debug("- range %u-%u%s",
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offset, to, msg->msg_flags ? " [more]" : "");
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iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC,
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iov, 1, to - offset);
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/* have to change the state *before* sending the last
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* packet as RxRPC might give us the reply before it
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* returns from sending the request */
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if (first + loop >= last)
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call->state = AFS_CALL_AWAIT_REPLY;
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ret = rxrpc_kernel_send_data(afs_socket, call->rxcall,
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msg, to - offset);
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kunmap(pages[loop]);
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if (ret < 0)
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break;
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} while (++loop < count);
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first += count;
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for (loop = 0; loop < count; loop++)
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put_page(pages[loop]);
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if (ret < 0)
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break;
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} while (first <= last);
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* initiate a call
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*/
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int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
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const struct afs_wait_mode *wait_mode)
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{
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struct sockaddr_rxrpc srx;
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struct rxrpc_call *rxcall;
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struct msghdr msg;
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struct kvec iov[1];
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int ret;
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_enter("%x,{%d},", addr->s_addr, ntohs(call->port));
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ASSERT(call->type != NULL);
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ASSERT(call->type->name != NULL);
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_debug("____MAKE %p{%s,%x} [%d]____",
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call, call->type->name, key_serial(call->key),
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atomic_read(&afs_outstanding_calls));
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call->wait_mode = wait_mode;
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INIT_WORK(&call->async_work, afs_process_async_call);
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memset(&srx, 0, sizeof(srx));
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srx.srx_family = AF_RXRPC;
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srx.srx_service = call->service_id;
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srx.transport_type = SOCK_DGRAM;
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srx.transport_len = sizeof(srx.transport.sin);
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srx.transport.sin.sin_family = AF_INET;
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srx.transport.sin.sin_port = call->port;
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memcpy(&srx.transport.sin.sin_addr, addr, 4);
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/* create a call */
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rxcall = rxrpc_kernel_begin_call(afs_socket, &srx, call->key,
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(unsigned long) call, gfp,
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wait_mode->notify_rx);
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call->key = NULL;
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if (IS_ERR(rxcall)) {
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ret = PTR_ERR(rxcall);
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goto error_kill_call;
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}
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call->rxcall = rxcall;
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/* send the request */
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iov[0].iov_base = call->request;
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iov[0].iov_len = call->request_size;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1,
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call->request_size);
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = (call->send_pages ? MSG_MORE : 0);
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/* have to change the state *before* sending the last packet as RxRPC
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* might give us the reply before it returns from sending the
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* request */
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if (!call->send_pages)
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call->state = AFS_CALL_AWAIT_REPLY;
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ret = rxrpc_kernel_send_data(afs_socket, rxcall,
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&msg, call->request_size);
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if (ret < 0)
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goto error_do_abort;
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if (call->send_pages) {
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ret = afs_send_pages(call, &msg, iov);
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if (ret < 0)
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goto error_do_abort;
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}
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/* at this point, an async call may no longer exist as it may have
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* already completed */
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return wait_mode->wait(call);
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error_do_abort:
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rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, -ret, "KSD");
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error_kill_call:
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afs_end_call(call);
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* deliver messages to a call
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*/
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static void afs_deliver_to_call(struct afs_call *call)
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{
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u32 abort_code;
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int ret;
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_enter("%s", call->type->name);
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while (call->state == AFS_CALL_AWAIT_REPLY ||
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call->state == AFS_CALL_AWAIT_OP_ID ||
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call->state == AFS_CALL_AWAIT_REQUEST ||
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call->state == AFS_CALL_AWAIT_ACK
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) {
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if (call->state == AFS_CALL_AWAIT_ACK) {
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size_t offset = 0;
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ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall,
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NULL, 0, &offset, false,
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&call->abort_code);
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if (ret == -EINPROGRESS || ret == -EAGAIN)
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return;
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if (ret == 1 || ret < 0) {
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call->state = AFS_CALL_COMPLETE;
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goto done;
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}
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return;
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}
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ret = call->type->deliver(call);
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switch (ret) {
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case 0:
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if (call->state == AFS_CALL_AWAIT_REPLY)
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call->state = AFS_CALL_COMPLETE;
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goto done;
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case -EINPROGRESS:
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case -EAGAIN:
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goto out;
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case -ENOTCONN:
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abort_code = RX_CALL_DEAD;
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rxrpc_kernel_abort_call(afs_socket, call->rxcall,
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abort_code, -ret, "KNC");
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goto do_abort;
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case -ENOTSUPP:
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abort_code = RX_INVALID_OPERATION;
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rxrpc_kernel_abort_call(afs_socket, call->rxcall,
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abort_code, -ret, "KIV");
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goto do_abort;
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case -ENODATA:
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case -EBADMSG:
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case -EMSGSIZE:
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default:
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abort_code = RXGEN_CC_UNMARSHAL;
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if (call->state != AFS_CALL_AWAIT_REPLY)
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abort_code = RXGEN_SS_UNMARSHAL;
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rxrpc_kernel_abort_call(afs_socket, call->rxcall,
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abort_code, EBADMSG, "KUM");
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goto do_abort;
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}
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}
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done:
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if (call->state == AFS_CALL_COMPLETE && call->incoming)
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afs_end_call(call);
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out:
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_leave("");
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return;
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do_abort:
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call->error = ret;
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call->state = AFS_CALL_COMPLETE;
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goto done;
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}
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/*
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* wait synchronously for a call to complete
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*/
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static int afs_wait_for_call_to_complete(struct afs_call *call)
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{
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const char *abort_why;
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int ret;
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DECLARE_WAITQUEUE(myself, current);
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_enter("");
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add_wait_queue(&call->waitq, &myself);
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for (;;) {
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set_current_state(TASK_INTERRUPTIBLE);
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/* deliver any messages that are in the queue */
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if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
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call->need_attention = false;
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__set_current_state(TASK_RUNNING);
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afs_deliver_to_call(call);
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continue;
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}
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abort_why = "KWC";
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ret = call->error;
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if (call->state == AFS_CALL_COMPLETE)
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break;
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abort_why = "KWI";
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ret = -EINTR;
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if (signal_pending(current))
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break;
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schedule();
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}
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remove_wait_queue(&call->waitq, &myself);
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__set_current_state(TASK_RUNNING);
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/* kill the call */
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if (call->state < AFS_CALL_COMPLETE) {
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_debug("call incomplete");
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rxrpc_kernel_abort_call(afs_socket, call->rxcall,
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RX_CALL_DEAD, -ret, abort_why);
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}
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_debug("call complete");
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|
afs_end_call(call);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* wake up a waiting call
|
|
*/
|
|
static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
|
|
unsigned long call_user_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)call_user_ID;
|
|
|
|
call->need_attention = true;
|
|
wake_up(&call->waitq);
|
|
}
|
|
|
|
/*
|
|
* wake up an asynchronous call
|
|
*/
|
|
static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
|
|
unsigned long call_user_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)call_user_ID;
|
|
|
|
call->need_attention = true;
|
|
queue_work(afs_async_calls, &call->async_work);
|
|
}
|
|
|
|
/*
|
|
* put a call into asynchronous mode
|
|
* - mustn't touch the call descriptor as the call my have completed by the
|
|
* time we get here
|
|
*/
|
|
static int afs_dont_wait_for_call_to_complete(struct afs_call *call)
|
|
{
|
|
_enter("");
|
|
return -EINPROGRESS;
|
|
}
|
|
|
|
/*
|
|
* delete an asynchronous call
|
|
*/
|
|
static void afs_delete_async_call(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, async_work);
|
|
|
|
_enter("");
|
|
|
|
afs_free_call(call);
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* perform processing on an asynchronous call
|
|
*/
|
|
static void afs_process_async_call(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, async_work);
|
|
|
|
_enter("");
|
|
|
|
if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
|
|
call->need_attention = false;
|
|
afs_deliver_to_call(call);
|
|
}
|
|
|
|
if (call->state == AFS_CALL_COMPLETE && call->wait_mode) {
|
|
if (call->wait_mode->async_complete)
|
|
call->wait_mode->async_complete(call->reply,
|
|
call->error);
|
|
call->reply = NULL;
|
|
|
|
/* kill the call */
|
|
afs_end_call_nofree(call);
|
|
|
|
/* we can't just delete the call because the work item may be
|
|
* queued */
|
|
call->async_work.func = afs_delete_async_call;
|
|
queue_work(afs_async_calls, &call->async_work);
|
|
}
|
|
|
|
_leave("");
|
|
}
|
|
|
|
static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)user_call_ID;
|
|
|
|
call->rxcall = rxcall;
|
|
}
|
|
|
|
/*
|
|
* Charge the incoming call preallocation.
|
|
*/
|
|
static void afs_charge_preallocation(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = afs_spare_incoming_call;
|
|
|
|
for (;;) {
|
|
if (!call) {
|
|
call = kzalloc(sizeof(struct afs_call), GFP_KERNEL);
|
|
if (!call)
|
|
break;
|
|
|
|
INIT_WORK(&call->async_work, afs_process_async_call);
|
|
call->wait_mode = &afs_async_incoming_call;
|
|
call->type = &afs_RXCMxxxx;
|
|
init_waitqueue_head(&call->waitq);
|
|
call->state = AFS_CALL_AWAIT_OP_ID;
|
|
}
|
|
|
|
if (rxrpc_kernel_charge_accept(afs_socket,
|
|
afs_wake_up_async_call,
|
|
afs_rx_attach,
|
|
(unsigned long)call,
|
|
GFP_KERNEL) < 0)
|
|
break;
|
|
call = NULL;
|
|
}
|
|
afs_spare_incoming_call = call;
|
|
}
|
|
|
|
/*
|
|
* Discard a preallocated call when a socket is shut down.
|
|
*/
|
|
static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
|
|
unsigned long user_call_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)user_call_ID;
|
|
|
|
atomic_inc(&afs_outstanding_calls);
|
|
call->rxcall = NULL;
|
|
afs_free_call(call);
|
|
}
|
|
|
|
/*
|
|
* Notification of an incoming call.
|
|
*/
|
|
static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
|
|
unsigned long user_call_ID)
|
|
{
|
|
atomic_inc(&afs_outstanding_calls);
|
|
queue_work(afs_wq, &afs_charge_preallocation_work);
|
|
}
|
|
|
|
/*
|
|
* Grab the operation ID from an incoming cache manager call. The socket
|
|
* buffer is discarded on error or if we don't yet have sufficient data.
|
|
*/
|
|
static int afs_deliver_cm_op_id(struct afs_call *call)
|
|
{
|
|
int ret;
|
|
|
|
_enter("{%zu}", call->offset);
|
|
|
|
ASSERTCMP(call->offset, <, 4);
|
|
|
|
/* the operation ID forms the first four bytes of the request data */
|
|
ret = afs_extract_data(call, &call->operation_ID, 4, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
call->state = AFS_CALL_AWAIT_REQUEST;
|
|
call->offset = 0;
|
|
|
|
/* ask the cache manager to route the call (it'll change the call type
|
|
* if successful) */
|
|
if (!afs_cm_incoming_call(call))
|
|
return -ENOTSUPP;
|
|
|
|
/* pass responsibility for the remainer of this message off to the
|
|
* cache manager op */
|
|
return call->type->deliver(call);
|
|
}
|
|
|
|
/*
|
|
* send an empty reply
|
|
*/
|
|
void afs_send_empty_reply(struct afs_call *call)
|
|
{
|
|
struct msghdr msg;
|
|
|
|
_enter("");
|
|
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, NULL, 0, 0);
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
call->state = AFS_CALL_AWAIT_ACK;
|
|
switch (rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, 0)) {
|
|
case 0:
|
|
_leave(" [replied]");
|
|
return;
|
|
|
|
case -ENOMEM:
|
|
_debug("oom");
|
|
rxrpc_kernel_abort_call(afs_socket, call->rxcall,
|
|
RX_USER_ABORT, ENOMEM, "KOO");
|
|
default:
|
|
afs_end_call(call);
|
|
_leave(" [error]");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* send a simple reply
|
|
*/
|
|
void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
|
|
{
|
|
struct msghdr msg;
|
|
struct kvec iov[1];
|
|
int n;
|
|
|
|
_enter("");
|
|
|
|
iov[0].iov_base = (void *) buf;
|
|
iov[0].iov_len = len;
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iov, 1, len);
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
call->state = AFS_CALL_AWAIT_ACK;
|
|
n = rxrpc_kernel_send_data(afs_socket, call->rxcall, &msg, len);
|
|
if (n >= 0) {
|
|
/* Success */
|
|
_leave(" [replied]");
|
|
return;
|
|
}
|
|
|
|
if (n == -ENOMEM) {
|
|
_debug("oom");
|
|
rxrpc_kernel_abort_call(afs_socket, call->rxcall,
|
|
RX_USER_ABORT, ENOMEM, "KOO");
|
|
}
|
|
afs_end_call(call);
|
|
_leave(" [error]");
|
|
}
|
|
|
|
/*
|
|
* Extract a piece of data from the received data socket buffers.
|
|
*/
|
|
int afs_extract_data(struct afs_call *call, void *buf, size_t count,
|
|
bool want_more)
|
|
{
|
|
int ret;
|
|
|
|
_enter("{%s,%zu},,%zu,%d",
|
|
call->type->name, call->offset, count, want_more);
|
|
|
|
ASSERTCMP(call->offset, <=, count);
|
|
|
|
ret = rxrpc_kernel_recv_data(afs_socket, call->rxcall,
|
|
buf, count, &call->offset,
|
|
want_more, &call->abort_code);
|
|
if (ret == 0 || ret == -EAGAIN)
|
|
return ret;
|
|
|
|
if (ret == 1) {
|
|
switch (call->state) {
|
|
case AFS_CALL_AWAIT_REPLY:
|
|
call->state = AFS_CALL_COMPLETE;
|
|
break;
|
|
case AFS_CALL_AWAIT_REQUEST:
|
|
call->state = AFS_CALL_REPLYING;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (ret == -ECONNABORTED)
|
|
call->error = call->type->abort_to_error(call->abort_code);
|
|
else
|
|
call->error = ret;
|
|
call->state = AFS_CALL_COMPLETE;
|
|
return ret;
|
|
}
|