projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| a3a49a17 SF |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* | |
| e4a3f096 | 3 | * Copyright (C) 2005-2020 Junjiro R. Okajima |
| a3a49a17 SF |
4 | * |
| 5 | * This program, aufs is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License as published by | |
| 7 | * the Free Software Foundation; either version 2 of the License, or | |
| 8 | * (at your option) any later version. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 | */ | |
| 18 | ||
| 19 | /* | |
| 20 | * workqueue for asynchronous/super-io operations | |
| 21 | * todo: try new credentials management scheme | |
| 22 | */ | |
| 23 | ||
| 24 | #ifndef __AUFS_WKQ_H__ | |
| 25 | #define __AUFS_WKQ_H__ | |
| 26 | ||
| 27 | #ifdef __KERNEL__ | |
| 28 | ||
| 29 | #include <linux/wait.h> | |
| 30 | ||
| 31 | struct super_block; | |
| 32 | ||
| 33 | /* ---------------------------------------------------------------------- */ | |
| 34 | ||
| 35 | /* | |
| 36 | * in the next operation, wait for the 'nowait' tasks in system-wide workqueue | |
| 37 | */ | |
| 38 | struct au_nowait_tasks { | |
| 39 | atomic_t nw_len; | |
| 40 | wait_queue_head_t nw_wq; | |
| 41 | }; | |
| 42 | ||
| 43 | /* ---------------------------------------------------------------------- */ | |
| 44 | ||
| 45 | typedef void (*au_wkq_func_t)(void *args); | |
| 46 | ||
| 47 | /* wkq flags */ | |
| 48 | #define AuWkq_WAIT 1 | |
| 49 | #define AuWkq_NEST (1 << 1) | |
| 50 | #define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name) | |
| 51 | #define au_fset_wkq(flags, name) \ | |
| 52 | do { (flags) |= AuWkq_##name; } while (0) | |
| 53 | #define au_fclr_wkq(flags, name) \ | |
| 54 | do { (flags) &= ~AuWkq_##name; } while (0) | |
| 55 | ||
| 56 | /* wkq.c */ | |
| 57 | int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args); | |
| 58 | int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, | |
| 59 | unsigned int flags); | |
| 60 | void au_nwt_init(struct au_nowait_tasks *nwt); | |
| 61 | int __init au_wkq_init(void); | |
| 62 | void au_wkq_fin(void); | |
| 63 | ||
| 64 | /* ---------------------------------------------------------------------- */ | |
| 65 | ||
| 66 | static inline int au_wkq_test(void) | |
| 67 | { | |
| 68 | return current->flags & PF_WQ_WORKER; | |
| 69 | } | |
| 70 | ||
| 71 | static inline int au_wkq_wait(au_wkq_func_t func, void *args) | |
| 72 | { | |
| 73 | return au_wkq_do_wait(AuWkq_WAIT, func, args); | |
| 74 | } | |
| 75 | ||
| 76 | static inline void au_nwt_done(struct au_nowait_tasks *nwt) | |
| 77 | { | |
| 78 | if (atomic_dec_and_test(&nwt->nw_len)) | |
| 79 | wake_up_all(&nwt->nw_wq); | |
| 80 | } | |
| 81 | ||
| 82 | static inline int au_nwt_flush(struct au_nowait_tasks *nwt) | |
| 83 | { | |
| 84 | wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len)); | |
| 85 | return 0; | |
| 86 | } | |
| 87 | ||
| 88 | #endif /* __KERNEL__ */ | |
| 89 | #endif /* __AUFS_WKQ_H__ */ |