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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005-2020 Junjiro R. Okajima
*
* This program, aufs is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* workqueue for asynchronous/super-io operations
* todo: try new credentials management scheme
*/
#ifndef __AUFS_WKQ_H__
#define __AUFS_WKQ_H__
#ifdef __KERNEL__
#include <linux/wait.h>
struct super_block;
/* ---------------------------------------------------------------------- */
/*
* in the next operation, wait for the 'nowait' tasks in system-wide workqueue
*/
struct au_nowait_tasks {
atomic_t nw_len;
wait_queue_head_t nw_wq;
};
/* ---------------------------------------------------------------------- */
typedef void (*au_wkq_func_t)(void *args);
/* wkq flags */
#define AuWkq_WAIT 1
#define AuWkq_NEST (1 << 1)
#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
#define au_fset_wkq(flags, name) \
do { (flags) |= AuWkq_##name; } while (0)
#define au_fclr_wkq(flags, name) \
do { (flags) &= ~AuWkq_##name; } while (0)
/* wkq.c */
int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
unsigned int flags);
void au_nwt_init(struct au_nowait_tasks *nwt);
int __init au_wkq_init(void);
void au_wkq_fin(void);
/* ---------------------------------------------------------------------- */
static inline int au_wkq_test(void)
{
return current->flags & PF_WQ_WORKER;
}
static inline int au_wkq_wait(au_wkq_func_t func, void *args)
{
return au_wkq_do_wait(AuWkq_WAIT, func, args);
}
static inline void au_nwt_done(struct au_nowait_tasks *nwt)
{
if (atomic_dec_and_test(&nwt->nw_len))
wake_up_all(&nwt->nw_wq);
}
static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
{
wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
return 0;
}
#endif /* __KERNEL__ */
#endif /* __AUFS_WKQ_H__ */
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