2 * Copyright (C) 2005-2013 Junjiro R. Okajima
4 * This program, aufs is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * workqueue for asynchronous/super-io operations
21 * todo: try new credentials management scheme
24 #ifndef __AUFS_WKQ_H__
25 #define __AUFS_WKQ_H__
31 /* ---------------------------------------------------------------------- */
34 * in the next operation, wait for the 'nowait' tasks in system-wide workqueue
36 struct au_nowait_tasks {
38 wait_queue_head_t nw_wq;
41 /* ---------------------------------------------------------------------- */
43 typedef void (*au_wkq_func_t)(void *args);
47 #define AuWkq_NEST (1 << 1)
48 #define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name)
49 #define au_fset_wkq(flags, name) \
50 do { (flags) |= AuWkq_##name; } while (0)
51 #define au_fclr_wkq(flags, name) \
52 do { (flags) &= ~AuWkq_##name; } while (0)
54 #ifndef CONFIG_AUFS_HNOTIFY
60 int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
61 int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
63 void au_nwt_init(struct au_nowait_tasks *nwt);
64 int __init au_wkq_init(void);
65 void au_wkq_fin(void);
67 /* ---------------------------------------------------------------------- */
69 static inline int au_wkq_test(void)
71 return current->flags & PF_WQ_WORKER;
74 static inline int au_wkq_wait(au_wkq_func_t func, void *args)
76 return au_wkq_do_wait(AuWkq_WAIT, func, args);
79 static inline void au_nwt_done(struct au_nowait_tasks *nwt)
81 if (atomic_dec_and_test(&nwt->nw_len))
82 wake_up_all(&nwt->nw_wq);
85 static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
87 wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
91 #endif /* __KERNEL__ */
92 #endif /* __AUFS_WKQ_H__ */