653 lines
14 KiB
C
653 lines
14 KiB
C
/* cmservice.c: AFS Cache Manager Service
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*
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* Copyright (C) 2002 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/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/completion.h>
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#include "server.h"
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#include "cell.h"
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#include "transport.h"
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#include <rxrpc/rxrpc.h>
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#include <rxrpc/transport.h>
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#include <rxrpc/connection.h>
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#include <rxrpc/call.h>
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#include "cmservice.h"
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#include "internal.h"
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static unsigned afscm_usage; /* AFS cache manager usage count */
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static struct rw_semaphore afscm_sem; /* AFS cache manager start/stop semaphore */
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static int afscm_new_call(struct rxrpc_call *call);
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static void afscm_attention(struct rxrpc_call *call);
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static void afscm_error(struct rxrpc_call *call);
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static void afscm_aemap(struct rxrpc_call *call);
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static void _SRXAFSCM_CallBack(struct rxrpc_call *call);
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static void _SRXAFSCM_InitCallBackState(struct rxrpc_call *call);
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static void _SRXAFSCM_Probe(struct rxrpc_call *call);
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typedef void (*_SRXAFSCM_xxxx_t)(struct rxrpc_call *call);
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static const struct rxrpc_operation AFSCM_ops[] = {
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{
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.id = 204,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "CallBack",
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.user = _SRXAFSCM_CallBack,
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},
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{
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.id = 205,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "InitCallBackState",
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.user = _SRXAFSCM_InitCallBackState,
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},
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{
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.id = 206,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "Probe",
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.user = _SRXAFSCM_Probe,
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},
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#if 0
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{
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.id = 207,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "GetLock",
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.user = _SRXAFSCM_GetLock,
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},
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{
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.id = 208,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "GetCE",
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.user = _SRXAFSCM_GetCE,
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},
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{
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.id = 209,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "GetXStatsVersion",
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.user = _SRXAFSCM_GetXStatsVersion,
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},
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{
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.id = 210,
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.asize = RXRPC_APP_MARK_EOF,
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.name = "GetXStats",
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.user = _SRXAFSCM_GetXStats,
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}
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#endif
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};
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static struct rxrpc_service AFSCM_service = {
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.name = "AFS/CM",
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(AFSCM_service.link),
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.new_call = afscm_new_call,
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.service_id = 1,
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.attn_func = afscm_attention,
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.error_func = afscm_error,
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.aemap_func = afscm_aemap,
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.ops_begin = &AFSCM_ops[0],
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.ops_end = &AFSCM_ops[ARRAY_SIZE(AFSCM_ops)],
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};
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static DECLARE_COMPLETION(kafscmd_alive);
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static DECLARE_COMPLETION(kafscmd_dead);
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static DECLARE_WAIT_QUEUE_HEAD(kafscmd_sleepq);
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static LIST_HEAD(kafscmd_attention_list);
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static LIST_HEAD(afscm_calls);
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static DEFINE_SPINLOCK(afscm_calls_lock);
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static DEFINE_SPINLOCK(kafscmd_attention_lock);
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static int kafscmd_die;
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/*****************************************************************************/
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/*
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* AFS Cache Manager kernel thread
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*/
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static int kafscmd(void *arg)
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{
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DECLARE_WAITQUEUE(myself, current);
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struct rxrpc_call *call;
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_SRXAFSCM_xxxx_t func;
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int die;
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printk(KERN_INFO "kAFS: Started kafscmd %d\n", current->pid);
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daemonize("kafscmd");
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complete(&kafscmd_alive);
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/* loop around looking for things to attend to */
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do {
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if (list_empty(&kafscmd_attention_list)) {
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&kafscmd_sleepq, &myself);
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for (;;) {
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set_current_state(TASK_INTERRUPTIBLE);
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if (!list_empty(&kafscmd_attention_list) ||
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signal_pending(current) ||
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kafscmd_die)
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break;
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schedule();
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}
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remove_wait_queue(&kafscmd_sleepq, &myself);
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set_current_state(TASK_RUNNING);
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}
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die = kafscmd_die;
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/* dequeue the next call requiring attention */
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call = NULL;
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spin_lock(&kafscmd_attention_lock);
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if (!list_empty(&kafscmd_attention_list)) {
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call = list_entry(kafscmd_attention_list.next,
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struct rxrpc_call,
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app_attn_link);
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list_del_init(&call->app_attn_link);
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die = 0;
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}
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spin_unlock(&kafscmd_attention_lock);
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if (call) {
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/* act upon it */
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_debug("@@@ Begin Attend Call %p", call);
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func = call->app_user;
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if (func)
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func(call);
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rxrpc_put_call(call);
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_debug("@@@ End Attend Call %p", call);
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}
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} while(!die);
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/* and that's all */
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complete_and_exit(&kafscmd_dead, 0);
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} /* end kafscmd() */
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/*****************************************************************************/
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/*
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* handle a call coming in to the cache manager
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* - if I want to keep the call, I must increment its usage count
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* - the return value will be negated and passed back in an abort packet if
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* non-zero
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* - serialised by virtue of there only being one krxiod
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*/
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static int afscm_new_call(struct rxrpc_call *call)
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{
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_enter("%p{cid=%u u=%d}",
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call, ntohl(call->call_id), atomic_read(&call->usage));
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rxrpc_get_call(call);
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/* add to my current call list */
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spin_lock(&afscm_calls_lock);
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list_add(&call->app_link,&afscm_calls);
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spin_unlock(&afscm_calls_lock);
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_leave(" = 0");
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return 0;
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} /* end afscm_new_call() */
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/*****************************************************************************/
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/*
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* queue on the kafscmd queue for attention
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*/
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static void afscm_attention(struct rxrpc_call *call)
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{
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_enter("%p{cid=%u u=%d}",
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call, ntohl(call->call_id), atomic_read(&call->usage));
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spin_lock(&kafscmd_attention_lock);
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if (list_empty(&call->app_attn_link)) {
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list_add_tail(&call->app_attn_link, &kafscmd_attention_list);
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rxrpc_get_call(call);
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}
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spin_unlock(&kafscmd_attention_lock);
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wake_up(&kafscmd_sleepq);
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_leave(" {u=%d}", atomic_read(&call->usage));
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} /* end afscm_attention() */
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/*****************************************************************************/
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/*
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* handle my call being aborted
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* - clean up, dequeue and put my ref to the call
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*/
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static void afscm_error(struct rxrpc_call *call)
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{
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int removed;
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_enter("%p{est=%s ac=%u er=%d}",
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call,
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rxrpc_call_error_states[call->app_err_state],
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call->app_abort_code,
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call->app_errno);
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spin_lock(&kafscmd_attention_lock);
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if (list_empty(&call->app_attn_link)) {
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list_add_tail(&call->app_attn_link, &kafscmd_attention_list);
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rxrpc_get_call(call);
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}
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spin_unlock(&kafscmd_attention_lock);
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removed = 0;
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spin_lock(&afscm_calls_lock);
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if (!list_empty(&call->app_link)) {
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list_del_init(&call->app_link);
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removed = 1;
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}
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spin_unlock(&afscm_calls_lock);
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if (removed)
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rxrpc_put_call(call);
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wake_up(&kafscmd_sleepq);
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_leave("");
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} /* end afscm_error() */
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/*****************************************************************************/
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/*
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* map afs abort codes to/from Linux error codes
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* - called with call->lock held
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*/
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static void afscm_aemap(struct rxrpc_call *call)
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{
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switch (call->app_err_state) {
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case RXRPC_ESTATE_LOCAL_ABORT:
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call->app_abort_code = -call->app_errno;
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break;
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case RXRPC_ESTATE_PEER_ABORT:
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call->app_errno = -ECONNABORTED;
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break;
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default:
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break;
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}
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} /* end afscm_aemap() */
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/*****************************************************************************/
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/*
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* start the cache manager service if not already started
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*/
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int afscm_start(void)
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{
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int ret;
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down_write(&afscm_sem);
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if (!afscm_usage) {
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ret = kernel_thread(kafscmd, NULL, 0);
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if (ret < 0)
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goto out;
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wait_for_completion(&kafscmd_alive);
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ret = rxrpc_add_service(afs_transport, &AFSCM_service);
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if (ret < 0)
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goto kill;
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afs_kafstimod_add_timer(&afs_mntpt_expiry_timer,
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afs_mntpt_expiry_timeout * HZ);
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}
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afscm_usage++;
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up_write(&afscm_sem);
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return 0;
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kill:
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kafscmd_die = 1;
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wake_up(&kafscmd_sleepq);
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wait_for_completion(&kafscmd_dead);
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out:
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up_write(&afscm_sem);
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return ret;
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} /* end afscm_start() */
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/*****************************************************************************/
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/*
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* stop the cache manager service
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*/
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void afscm_stop(void)
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{
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struct rxrpc_call *call;
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down_write(&afscm_sem);
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BUG_ON(afscm_usage == 0);
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afscm_usage--;
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if (afscm_usage == 0) {
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/* don't want more incoming calls */
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rxrpc_del_service(afs_transport, &AFSCM_service);
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/* abort any calls I've still got open (the afscm_error() will
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* dequeue them) */
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spin_lock(&afscm_calls_lock);
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while (!list_empty(&afscm_calls)) {
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call = list_entry(afscm_calls.next,
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struct rxrpc_call,
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app_link);
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list_del_init(&call->app_link);
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rxrpc_get_call(call);
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spin_unlock(&afscm_calls_lock);
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rxrpc_call_abort(call, -ESRCH); /* abort, dequeue and
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* put */
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_debug("nuking active call %08x.%d",
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ntohl(call->conn->conn_id),
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ntohl(call->call_id));
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rxrpc_put_call(call);
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rxrpc_put_call(call);
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spin_lock(&afscm_calls_lock);
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}
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spin_unlock(&afscm_calls_lock);
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/* get rid of my daemon */
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kafscmd_die = 1;
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wake_up(&kafscmd_sleepq);
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wait_for_completion(&kafscmd_dead);
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/* dispose of any calls waiting for attention */
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spin_lock(&kafscmd_attention_lock);
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while (!list_empty(&kafscmd_attention_list)) {
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call = list_entry(kafscmd_attention_list.next,
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struct rxrpc_call,
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app_attn_link);
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list_del_init(&call->app_attn_link);
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spin_unlock(&kafscmd_attention_lock);
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rxrpc_put_call(call);
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spin_lock(&kafscmd_attention_lock);
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}
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spin_unlock(&kafscmd_attention_lock);
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afs_kafstimod_del_timer(&afs_mntpt_expiry_timer);
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}
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up_write(&afscm_sem);
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} /* end afscm_stop() */
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/*****************************************************************************/
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/*
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* handle the fileserver breaking a set of callbacks
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*/
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static void _SRXAFSCM_CallBack(struct rxrpc_call *call)
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{
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struct afs_server *server;
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size_t count, qty, tmp;
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int ret = 0, removed;
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_enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
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server = afs_server_get_from_peer(call->conn->peer);
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switch (call->app_call_state) {
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/* we've received the last packet
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* - drain all the data from the call and send the reply
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*/
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case RXRPC_CSTATE_SRVR_GOT_ARGS:
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ret = -EBADMSG;
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qty = call->app_ready_qty;
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if (qty < 8 || qty > 50 * (6 * 4) + 8)
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break;
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{
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struct afs_callback *cb, *pcb;
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int loop;
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__be32 *fp, *bp;
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fp = rxrpc_call_alloc_scratch(call, qty);
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/* drag the entire argument block out to the scratch
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* space */
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ret = rxrpc_call_read_data(call, fp, qty, 0);
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if (ret < 0)
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break;
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/* and unmarshall the parameter block */
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ret = -EBADMSG;
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count = ntohl(*fp++);
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if (count>AFSCBMAX ||
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(count * (3 * 4) + 8 != qty &&
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count * (6 * 4) + 8 != qty))
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break;
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bp = fp + count*3;
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tmp = ntohl(*bp++);
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if (tmp > 0 && tmp != count)
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break;
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if (tmp == 0)
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bp = NULL;
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pcb = cb = rxrpc_call_alloc_scratch_s(
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call, struct afs_callback);
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for (loop = count - 1; loop >= 0; loop--) {
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pcb->fid.vid = ntohl(*fp++);
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pcb->fid.vnode = ntohl(*fp++);
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pcb->fid.unique = ntohl(*fp++);
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if (bp) {
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pcb->version = ntohl(*bp++);
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pcb->expiry = ntohl(*bp++);
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pcb->type = ntohl(*bp++);
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}
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else {
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pcb->version = 0;
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pcb->expiry = 0;
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pcb->type = AFSCM_CB_UNTYPED;
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}
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pcb++;
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}
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/* invoke the actual service routine */
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ret = SRXAFSCM_CallBack(server, count, cb);
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if (ret < 0)
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break;
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}
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/* send the reply */
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ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
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GFP_KERNEL, 0, &count);
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if (ret < 0)
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break;
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break;
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/* operation complete */
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case RXRPC_CSTATE_COMPLETE:
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call->app_user = NULL;
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removed = 0;
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spin_lock(&afscm_calls_lock);
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if (!list_empty(&call->app_link)) {
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list_del_init(&call->app_link);
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removed = 1;
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}
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spin_unlock(&afscm_calls_lock);
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if (removed)
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rxrpc_put_call(call);
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break;
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/* operation terminated on error */
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case RXRPC_CSTATE_ERROR:
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call->app_user = NULL;
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break;
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default:
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break;
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}
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if (ret < 0)
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rxrpc_call_abort(call, ret);
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afs_put_server(server);
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_leave(" = %d", ret);
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} /* end _SRXAFSCM_CallBack() */
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/*****************************************************************************/
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/*
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* handle the fileserver asking us to initialise our callback state
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*/
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static void _SRXAFSCM_InitCallBackState(struct rxrpc_call *call)
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{
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struct afs_server *server;
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size_t count;
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int ret = 0, removed;
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_enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
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server = afs_server_get_from_peer(call->conn->peer);
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switch (call->app_call_state) {
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/* we've received the last packet - drain all the data from the
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* call */
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case RXRPC_CSTATE_SRVR_GOT_ARGS:
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/* shouldn't be any args */
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ret = -EBADMSG;
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break;
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/* send the reply when asked for it */
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case RXRPC_CSTATE_SRVR_SND_REPLY:
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/* invoke the actual service routine */
|
|
ret = SRXAFSCM_InitCallBackState(server);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
|
|
GFP_KERNEL, 0, &count);
|
|
if (ret < 0)
|
|
break;
|
|
break;
|
|
|
|
/* operation complete */
|
|
case RXRPC_CSTATE_COMPLETE:
|
|
call->app_user = NULL;
|
|
removed = 0;
|
|
spin_lock(&afscm_calls_lock);
|
|
if (!list_empty(&call->app_link)) {
|
|
list_del_init(&call->app_link);
|
|
removed = 1;
|
|
}
|
|
spin_unlock(&afscm_calls_lock);
|
|
|
|
if (removed)
|
|
rxrpc_put_call(call);
|
|
break;
|
|
|
|
/* operation terminated on error */
|
|
case RXRPC_CSTATE_ERROR:
|
|
call->app_user = NULL;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (ret < 0)
|
|
rxrpc_call_abort(call, ret);
|
|
|
|
afs_put_server(server);
|
|
|
|
_leave(" = %d", ret);
|
|
|
|
} /* end _SRXAFSCM_InitCallBackState() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* handle a probe from a fileserver
|
|
*/
|
|
static void _SRXAFSCM_Probe(struct rxrpc_call *call)
|
|
{
|
|
struct afs_server *server;
|
|
size_t count;
|
|
int ret = 0, removed;
|
|
|
|
_enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
|
|
|
|
server = afs_server_get_from_peer(call->conn->peer);
|
|
|
|
switch (call->app_call_state) {
|
|
/* we've received the last packet - drain all the data from the
|
|
* call */
|
|
case RXRPC_CSTATE_SRVR_GOT_ARGS:
|
|
/* shouldn't be any args */
|
|
ret = -EBADMSG;
|
|
break;
|
|
|
|
/* send the reply when asked for it */
|
|
case RXRPC_CSTATE_SRVR_SND_REPLY:
|
|
/* invoke the actual service routine */
|
|
ret = SRXAFSCM_Probe(server);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
|
|
GFP_KERNEL, 0, &count);
|
|
if (ret < 0)
|
|
break;
|
|
break;
|
|
|
|
/* operation complete */
|
|
case RXRPC_CSTATE_COMPLETE:
|
|
call->app_user = NULL;
|
|
removed = 0;
|
|
spin_lock(&afscm_calls_lock);
|
|
if (!list_empty(&call->app_link)) {
|
|
list_del_init(&call->app_link);
|
|
removed = 1;
|
|
}
|
|
spin_unlock(&afscm_calls_lock);
|
|
|
|
if (removed)
|
|
rxrpc_put_call(call);
|
|
break;
|
|
|
|
/* operation terminated on error */
|
|
case RXRPC_CSTATE_ERROR:
|
|
call->app_user = NULL;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (ret < 0)
|
|
rxrpc_call_abort(call, ret);
|
|
|
|
afs_put_server(server);
|
|
|
|
_leave(" = %d", ret);
|
|
|
|
} /* end _SRXAFSCM_Probe() */
|