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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2005-2019 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* workqueue for asynchronous/super-io operations
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* todo: try new credentials management scheme
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*/
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#ifndef __AUFS_WKQ_H__
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#define __AUFS_WKQ_H__
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#ifdef __KERNEL__
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#include <linux/wait.h>
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struct super_block;
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/* ---------------------------------------------------------------------- */
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/*
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* in the next operation, wait for the 'nowait' tasks in system-wide workqueue
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*/
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struct au_nowait_tasks {
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atomic_t nw_len;
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wait_queue_head_t nw_wq;
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};
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/* ---------------------------------------------------------------------- */
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typedef void (*au_wkq_func_t)(void *args);
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/* wkq flags */
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#define AuWkq_WAIT 1
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#define AuWkq_NEST (1 << 1)
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#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
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#define au_fset_wkq(flags, name) \
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do { (flags) |= AuWkq_##name; } while (0)
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#define au_fclr_wkq(flags, name) \
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do { (flags) &= ~AuWkq_##name; } while (0)
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/* wkq.c */
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int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
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int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
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unsigned int flags);
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void au_nwt_init(struct au_nowait_tasks *nwt);
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int __init au_wkq_init(void);
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void au_wkq_fin(void);
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/* ---------------------------------------------------------------------- */
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static inline int au_wkq_test(void)
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{
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return current->flags & PF_WQ_WORKER;
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}
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static inline int au_wkq_wait(au_wkq_func_t func, void *args)
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{
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return au_wkq_do_wait(AuWkq_WAIT, func, args);
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}
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static inline void au_nwt_done(struct au_nowait_tasks *nwt)
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{
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if (atomic_dec_and_test(&nwt->nw_len))
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wake_up_all(&nwt->nw_wq);
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}
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static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
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{
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wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
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return 0;
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}
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#endif /* __KERNEL__ */
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#endif /* __AUFS_WKQ_H__ */
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