1/* SPDX-License-Identifier: GPL-2.0-only */
 2#ifndef PAGE_ACTOR_H
 3#define PAGE_ACTOR_H
 4/*
 5 * Copyright (c) 2013
 6 * Phillip Lougher <phillip@squashfs.org.uk>
 7 */
 8
 9struct squashfs_page_actor {
10	union {
11		void		**buffer;
12		struct page	**page;
13	};
14	void	*pageaddr;
15	void	*tmp_buffer;
16	void    *(*squashfs_first_page)(struct squashfs_page_actor *);
17	void    *(*squashfs_next_page)(struct squashfs_page_actor *);
18	void    (*squashfs_finish_page)(struct squashfs_page_actor *);
19	struct page *last_page;
20	int	pages;
21	int	length;
22	int	next_page;
23	int	alloc_buffer;
24	int	returned_pages;
25	pgoff_t	next_index;
26};
27
28extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
29				int pages, int length);
30extern struct squashfs_page_actor *squashfs_page_actor_init_special(
31				struct squashfs_sb_info *msblk,
32				struct page **page, int pages, int length);
33static inline struct page *squashfs_page_actor_free(struct squashfs_page_actor *actor)
34{
35	struct page *last_page = actor->last_page;
36
37	kfree(actor->tmp_buffer);
38	kfree(actor);
39	return last_page;
40}
41static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
42{
43	return actor->squashfs_first_page(actor);
44}
45static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
46{
47	return actor->squashfs_next_page(actor);
48}
49static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
50{
51	actor->squashfs_finish_page(actor);
52}
53static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
54{
55	actor->alloc_buffer = 0;
56}
57#endif