1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Oracle.  All Rights Reserved.
4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
5  */
6 #ifndef __XFS_DEFER_H__
7 #define	__XFS_DEFER_H__
8 
9 struct xfs_defer_op_type;
10 
11 /*
12  * Save a log intent item and a list of extents, so that we can replay
13  * whatever action had to happen to the extent list and file the log done
14  * item.
15  */
16 struct xfs_defer_pending {
17 	const struct xfs_defer_op_type	*dfp_type;	/* function pointers */
18 	struct list_head		dfp_list;	/* pending items */
19 	void				*dfp_intent;	/* log intent item */
20 	void				*dfp_done;	/* log done item */
21 	struct list_head		dfp_work;	/* work items */
22 	unsigned int			dfp_count;	/* # extent items */
23 };
24 
25 /*
26  * Header for deferred operation list.
27  */
28 enum xfs_defer_ops_type {
29 	XFS_DEFER_OPS_TYPE_BMAP,
30 	XFS_DEFER_OPS_TYPE_REFCOUNT,
31 	XFS_DEFER_OPS_TYPE_RMAP,
32 	XFS_DEFER_OPS_TYPE_FREE,
33 	XFS_DEFER_OPS_TYPE_AGFL_FREE,
34 	XFS_DEFER_OPS_TYPE_MAX,
35 };
36 
37 void xfs_defer_add(struct xfs_trans *tp, enum xfs_defer_ops_type type,
38 		struct list_head *h);
39 int xfs_defer_finish_noroll(struct xfs_trans **tp);
40 int xfs_defer_finish(struct xfs_trans **tp);
41 void xfs_defer_cancel(struct xfs_trans *);
42 void xfs_defer_move(struct xfs_trans *dtp, struct xfs_trans *stp);
43 
44 /* Description of a deferred type. */
45 struct xfs_defer_op_type {
46 	enum xfs_defer_ops_type	type;
47 	unsigned int		max_items;
48 	void (*abort_intent)(void *);
49 	void *(*create_done)(struct xfs_trans *, void *, unsigned int);
50 	int (*finish_item)(struct xfs_trans *, struct list_head *, void *,
51 			void **);
52 	void (*finish_cleanup)(struct xfs_trans *, void *, int);
53 	void (*cancel_item)(struct list_head *);
54 	int (*diff_items)(void *, struct list_head *, struct list_head *);
55 	void *(*create_intent)(struct xfs_trans *, uint);
56 	void (*log_item)(struct xfs_trans *, void *, struct list_head *);
57 };
58 
59 void xfs_defer_init_op_type(const struct xfs_defer_op_type *type);
60 
61 #endif /* __XFS_DEFER_H__ */
62