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 
9 struct 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 
28 extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
29 				int pages, int length);
30 extern struct squashfs_page_actor *squashfs_page_actor_init_special(
31 				struct squashfs_sb_info *msblk,
32 				struct page **page, int pages, int length);
squashfs_page_actor_free(struct squashfs_page_actor * actor)33 static 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 }
squashfs_first_page(struct squashfs_page_actor * actor)41 static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
42 {
43 	return actor->squashfs_first_page(actor);
44 }
squashfs_next_page(struct squashfs_page_actor * actor)45 static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
46 {
47 	return actor->squashfs_next_page(actor);
48 }
squashfs_finish_page(struct squashfs_page_actor * actor)49 static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
50 {
51 	actor->squashfs_finish_page(actor);
52 }
squashfs_actor_nobuff(struct squashfs_page_actor * actor)53 static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
54 {
55 	actor->alloc_buffer = 0;
56 }
57 #endif
58