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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/ptlrpc/sec_gc.c
*
* Author: Eric Mei <ericm@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_SEC
#include "../../include/linux/libcfs/libcfs.h"
#include "../include/obd_support.h"
#include "../include/obd_class.h"
#include "../include/lustre_net.h"
#include "../include/lustre_sec.h"
#include "ptlrpc_internal.h"
#define SEC_GC_INTERVAL (30 * 60)
static struct mutex sec_gc_mutex;
static LIST_HEAD(sec_gc_list);
static spinlock_t sec_gc_list_lock;
static LIST_HEAD(sec_gc_ctx_list);
static spinlock_t sec_gc_ctx_list_lock;
static struct ptlrpc_thread sec_gc_thread;
static atomic_t sec_gc_wait_del = ATOMIC_INIT(0);
void sptlrpc_gc_add_sec(struct ptlrpc_sec *sec)
{
LASSERT(sec->ps_policy->sp_cops->gc_ctx);
LASSERT(sec->ps_gc_interval > 0);
LASSERT(list_empty(&sec->ps_gc_list));
sec->ps_gc_next = get_seconds() + sec->ps_gc_interval;
spin_lock(&sec_gc_list_lock);
list_add_tail(&sec_gc_list, &sec->ps_gc_list);
spin_unlock(&sec_gc_list_lock);
CDEBUG(D_SEC, "added sec %p(%s)\n", sec, sec->ps_policy->sp_name);
}
EXPORT_SYMBOL(sptlrpc_gc_add_sec);
void sptlrpc_gc_del_sec(struct ptlrpc_sec *sec)
{
if (list_empty(&sec->ps_gc_list))
return;
might_sleep();
/* signal before list_del to make iteration in gc thread safe */
atomic_inc(&sec_gc_wait_del);
spin_lock(&sec_gc_list_lock);
list_del_init(&sec->ps_gc_list);
spin_unlock(&sec_gc_list_lock);
/* barrier */
mutex_lock(&sec_gc_mutex);
mutex_unlock(&sec_gc_mutex);
atomic_dec(&sec_gc_wait_del);
CDEBUG(D_SEC, "del sec %p(%s)\n", sec, sec->ps_policy->sp_name);
}
EXPORT_SYMBOL(sptlrpc_gc_del_sec);
void sptlrpc_gc_add_ctx(struct ptlrpc_cli_ctx *ctx)
{
LASSERT(list_empty(&ctx->cc_gc_chain));
CDEBUG(D_SEC, "hand over ctx %p(%u->%s)\n",
ctx, ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec));
spin_lock(&sec_gc_ctx_list_lock);
list_add(&ctx->cc_gc_chain, &sec_gc_ctx_list);
spin_unlock(&sec_gc_ctx_list_lock);
thread_add_flags(&sec_gc_thread, SVC_SIGNAL);
wake_up(&sec_gc_thread.t_ctl_waitq);
}
EXPORT_SYMBOL(sptlrpc_gc_add_ctx);
static void sec_process_ctx_list(void)
{
struct ptlrpc_cli_ctx *ctx;
spin_lock(&sec_gc_ctx_list_lock);
while (!list_empty(&sec_gc_ctx_list)) {
ctx = list_entry(sec_gc_ctx_list.next,
struct ptlrpc_cli_ctx, cc_gc_chain);
list_del_init(&ctx->cc_gc_chain);
spin_unlock(&sec_gc_ctx_list_lock);
LASSERT(ctx->cc_sec);
LASSERT(atomic_read(&ctx->cc_refcount) == 1);
CDEBUG(D_SEC, "gc pick up ctx %p(%u->%s)\n",
ctx, ctx->cc_vcred.vc_uid, sec2target_str(ctx->cc_sec));
sptlrpc_cli_ctx_put(ctx, 1);
spin_lock(&sec_gc_ctx_list_lock);
}
spin_unlock(&sec_gc_ctx_list_lock);
}
static void sec_do_gc(struct ptlrpc_sec *sec)
{
LASSERT(sec->ps_policy->sp_cops->gc_ctx);
if (unlikely(sec->ps_gc_next == 0)) {
CDEBUG(D_SEC, "sec %p(%s) has 0 gc time\n",
sec, sec->ps_policy->sp_name);
return;
}
CDEBUG(D_SEC, "check on sec %p(%s)\n", sec, sec->ps_policy->sp_name);
if (cfs_time_after(sec->ps_gc_next, get_seconds()))
return;
sec->ps_policy->sp_cops->gc_ctx(sec);
sec->ps_gc_next = get_seconds() + sec->ps_gc_interval;
}
static int sec_gc_main(void *arg)
{
struct ptlrpc_thread *thread = (struct ptlrpc_thread *) arg;
struct l_wait_info lwi;
unshare_fs_struct();
/* Record that the thread is running */
thread_set_flags(thread, SVC_RUNNING);
wake_up(&thread->t_ctl_waitq);
while (1) {
struct ptlrpc_sec *sec;
thread_clear_flags(thread, SVC_SIGNAL);
sec_process_ctx_list();
again:
/* go through sec list do gc.
* FIXME here we iterate through the whole list each time which
* is not optimal. we perhaps want to use balanced binary tree
* to trace each sec as order of expiry time.
* another issue here is we wakeup as fixed interval instead of
* according to each sec's expiry time */
mutex_lock(&sec_gc_mutex);
list_for_each_entry(sec, &sec_gc_list, ps_gc_list) {
/* if someone is waiting to be deleted, let it
* proceed as soon as possible. */
if (atomic_read(&sec_gc_wait_del)) {
CDEBUG(D_SEC, "deletion pending, start over\n");
mutex_unlock(&sec_gc_mutex);
goto again;
}
sec_do_gc(sec);
}
mutex_unlock(&sec_gc_mutex);
/* check ctx list again before sleep */
sec_process_ctx_list();
lwi = LWI_TIMEOUT(SEC_GC_INTERVAL * HZ, NULL, NULL);
l_wait_event(thread->t_ctl_waitq,
thread_is_stopping(thread) ||
thread_is_signal(thread),
&lwi);
if (thread_test_and_clear_flags(thread, SVC_STOPPING))
break;
}
thread_set_flags(thread, SVC_STOPPED);
wake_up(&thread->t_ctl_waitq);
return 0;
}
int sptlrpc_gc_init(void)
{
struct l_wait_info lwi = { 0 };
struct task_struct *task;
mutex_init(&sec_gc_mutex);
spin_lock_init(&sec_gc_list_lock);
spin_lock_init(&sec_gc_ctx_list_lock);
/* initialize thread control */
memset(&sec_gc_thread, 0, sizeof(sec_gc_thread));
init_waitqueue_head(&sec_gc_thread.t_ctl_waitq);
task = kthread_run(sec_gc_main, &sec_gc_thread, "sptlrpc_gc");
if (IS_ERR(task)) {
CERROR("can't start gc thread: %ld\n", PTR_ERR(task));
return PTR_ERR(task);
}
l_wait_event(sec_gc_thread.t_ctl_waitq,
thread_is_running(&sec_gc_thread), &lwi);
return 0;
}
void sptlrpc_gc_fini(void)
{
struct l_wait_info lwi = { 0 };
thread_set_flags(&sec_gc_thread, SVC_STOPPING);
wake_up(&sec_gc_thread.t_ctl_waitq);
l_wait_event(sec_gc_thread.t_ctl_waitq,
thread_is_stopped(&sec_gc_thread), &lwi);
}
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