epoll: pull fatal signal checks into ep_send_events()
[linux-2.6-microblaze.git] / fs / xfs / xfs_pwork.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Copyright (C) 2019 Oracle.  All Rights Reserved.
4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
5  */
6 #ifndef __XFS_PWORK_H__
7 #define __XFS_PWORK_H__
8
9 struct xfs_pwork;
10 struct xfs_mount;
11
12 typedef int (*xfs_pwork_work_fn)(struct xfs_mount *mp, struct xfs_pwork *pwork);
13
14 /*
15  * Parallel work coordination structure.
16  */
17 struct xfs_pwork_ctl {
18         struct workqueue_struct *wq;
19         struct xfs_mount        *mp;
20         xfs_pwork_work_fn       work_fn;
21         struct wait_queue_head  poll_wait;
22         atomic_t                nr_work;
23         int                     error;
24 };
25
26 /*
27  * Embed this parallel work control item inside your own work structure,
28  * then queue work with it.
29  */
30 struct xfs_pwork {
31         struct work_struct      work;
32         struct xfs_pwork_ctl    *pctl;
33 };
34
35 #define XFS_PWORK_SINGLE_THREADED       { .pctl = NULL }
36
37 /* Have we been told to abort? */
38 static inline bool
39 xfs_pwork_ctl_want_abort(
40         struct xfs_pwork_ctl    *pctl)
41 {
42         return pctl && pctl->error;
43 }
44
45 /* Have we been told to abort? */
46 static inline bool
47 xfs_pwork_want_abort(
48         struct xfs_pwork        *pwork)
49 {
50         return xfs_pwork_ctl_want_abort(pwork->pctl);
51 }
52
53 int xfs_pwork_init(struct xfs_mount *mp, struct xfs_pwork_ctl *pctl,
54                 xfs_pwork_work_fn work_fn, const char *tag,
55                 unsigned int nr_threads);
56 void xfs_pwork_queue(struct xfs_pwork_ctl *pctl, struct xfs_pwork *pwork);
57 int xfs_pwork_destroy(struct xfs_pwork_ctl *pctl);
58 void xfs_pwork_poll(struct xfs_pwork_ctl *pctl);
59 unsigned int xfs_pwork_guess_datadev_parallelism(struct xfs_mount *mp);
60
61 #endif /* __XFS_PWORK_H__ */