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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) 2008, 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.
*/
#define DEBUG_SUBSYSTEM S_LNET
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs_struct.h>
#include <linux/sched.h>
#include "../../../include/linux/libcfs/libcfs.h"
#if defined(CONFIG_KGDB)
#include <asm/kgdb.h>
#endif
/**
* wait_queue_t of Linux (version < 2.6.34) is a FIFO list for exclusively
* waiting threads, which is not always desirable because all threads will
* be waken up again and again, even user only needs a few of them to be
* active most time. This is not good for performance because cache can
* be polluted by different threads.
*
* LIFO list can resolve this problem because we always wakeup the most
* recent active thread by default.
*
* NB: please don't call non-exclusive & exclusive wait on the same
* waitq if add_wait_queue_exclusive_head is used.
*/
void
add_wait_queue_exclusive_head(wait_queue_head_t *waitq, wait_queue_t *link)
{
unsigned long flags;
spin_lock_irqsave(&waitq->lock, flags);
__add_wait_queue_exclusive(waitq, link);
spin_unlock_irqrestore(&waitq->lock, flags);
}
EXPORT_SYMBOL(add_wait_queue_exclusive_head);
void cfs_init_timer(struct timer_list *t)
{
init_timer(t);
}
EXPORT_SYMBOL(cfs_init_timer);
void cfs_timer_init(struct timer_list *t, cfs_timer_func_t *func, void *arg)
{
init_timer(t);
t->function = func;
t->data = (unsigned long)arg;
}
EXPORT_SYMBOL(cfs_timer_init);
void cfs_timer_done(struct timer_list *t)
{
return;
}
EXPORT_SYMBOL(cfs_timer_done);
void cfs_timer_arm(struct timer_list *t, unsigned long deadline)
{
mod_timer(t, deadline);
}
EXPORT_SYMBOL(cfs_timer_arm);
void cfs_timer_disarm(struct timer_list *t)
{
del_timer(t);
}
EXPORT_SYMBOL(cfs_timer_disarm);
int cfs_timer_is_armed(struct timer_list *t)
{
return timer_pending(t);
}
EXPORT_SYMBOL(cfs_timer_is_armed);
unsigned long cfs_timer_deadline(struct timer_list *t)
{
return t->expires;
}
EXPORT_SYMBOL(cfs_timer_deadline);
void cfs_enter_debugger(void)
{
#if defined(CONFIG_KGDB)
// BREAKPOINT();
#else
/* nothing */
#endif
}
sigset_t
cfs_block_allsigs(void)
{
unsigned long flags;
sigset_t old;
spin_lock_irqsave(¤t->sighand->siglock, flags);
old = current->blocked;
sigfillset(¤t->blocked);
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
return old;
}
sigset_t cfs_block_sigs(unsigned long sigs)
{
unsigned long flags;
sigset_t old;
spin_lock_irqsave(¤t->sighand->siglock, flags);
old = current->blocked;
sigaddsetmask(¤t->blocked, sigs);
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
return old;
}
/* Block all signals except for the @sigs */
sigset_t cfs_block_sigsinv(unsigned long sigs)
{
unsigned long flags;
sigset_t old;
spin_lock_irqsave(¤t->sighand->siglock, flags);
old = current->blocked;
sigaddsetmask(¤t->blocked, ~sigs);
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
return old;
}
void
cfs_restore_sigs (sigset_t old)
{
unsigned long flags;
spin_lock_irqsave(¤t->sighand->siglock, flags);
current->blocked = old;
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
}
int
cfs_signal_pending(void)
{
return signal_pending(current);
}
void
cfs_clear_sigpending(void)
{
unsigned long flags;
spin_lock_irqsave(¤t->sighand->siglock, flags);
clear_tsk_thread_flag(current, TIF_SIGPENDING);
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
}
int
libcfs_arch_init(void)
{
return 0;
}
void
libcfs_arch_cleanup(void)
{
return;
}
EXPORT_SYMBOL(libcfs_arch_init);
EXPORT_SYMBOL(libcfs_arch_cleanup);
EXPORT_SYMBOL(cfs_enter_debugger);
EXPORT_SYMBOL(cfs_block_allsigs);
EXPORT_SYMBOL(cfs_block_sigs);
EXPORT_SYMBOL(cfs_block_sigsinv);
EXPORT_SYMBOL(cfs_restore_sigs);
EXPORT_SYMBOL(cfs_signal_pending);
EXPORT_SYMBOL(cfs_clear_sigpending);
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