[linux-2.6-block.git] / fs / squashfs / page_actor.h

/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef PAGE_ACTOR_H
#define PAGE_ACTOR_H
/*
 * Copyright (c) 2013
 * Phillip Lougher <phillip@squashfs.org.uk>
 */

struct squashfs_page_actor {
	union {
		void		**buffer;
		struct page	**page;
	};
	void	*pageaddr;
	void	*tmp_buffer;
	void    *(*squashfs_first_page)(struct squashfs_page_actor *);
	void    *(*squashfs_next_page)(struct squashfs_page_actor *);
	void    (*squashfs_finish_page)(struct squashfs_page_actor *);
	struct page *last_page;
	int	pages;
	int	length;
	int	next_page;
	int	alloc_buffer;
	int	returned_pages;
	pgoff_t	next_index;
};

extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
				int pages, int length);
extern struct squashfs_page_actor *squashfs_page_actor_init_special(
				struct squashfs_sb_info *msblk,
				struct page **page, int pages, int length,
				loff_t start_index);
static inline struct page *squashfs_page_actor_free(struct squashfs_page_actor *actor)
{
	struct page *last_page = actor->next_page == actor->pages ? actor->last_page : ERR_PTR(-EIO);

	kfree(actor->tmp_buffer);
	kfree(actor);

	return last_page;
}
static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
{
	return actor->squashfs_first_page(actor);
}
static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
{
	return actor->squashfs_next_page(actor);
}
static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
{
	actor->squashfs_finish_page(actor);
}
static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
{
	actor->alloc_buffer = 0;
}
#endif
Commit	Line	Data
20c8ccb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
846b730e PL	2	#ifndef PAGE_ACTOR_H
	3	#define PAGE_ACTOR_H
	4	/*
	5	* Copyright (c) 2013
	6	* Phillip Lougher <phillip@squashfs.org.uk>
846b730e PL	7	*/
846b730e PL	8
0d455c12 PL	9	struct squashfs_page_actor {
	10	union {
	11	void **buffer;
	12	struct page **page;
	13	};
	14	void *pageaddr;
f268eedd	15	void *tmp_buffer;
0d455c12 PL	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 );
9ef8eb61	19	struct page *last_page;
0d455c12 PL	20	int pages;
	21	int length;
	22	int next_page;
f268eedd PL	23	int alloc_buffer;
	24	int returned_pages;
	25	pgoff_t next_index;
0d455c12 PL	26	};
0d455c12 PL	27
f268eedd PL	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,
2258e22f PL	32	struct page **page, int pages, int length,
2258e22f PL	33	loff_t start_index);
9ef8eb61	34	static inline struct page squashfs_page_actor_free(struct squashfs_page_actor actor)
1f13dff0	35	{
84e0e03b	36	struct page *last_page = actor->next_page == actor->pages ? actor->last_page : ERR_PTR(-EIO);
9ef8eb61	37
1f13dff0 PL	38	kfree(actor->tmp_buffer);
1f13dff0 PL	39	kfree(actor);
84e0e03b	40
9ef8eb61	41	return last_page;
1f13dff0	42	}
0d455c12 PL	43	static inline void squashfs_first_page(struct squashfs_page_actor actor)
	44	{
	45	return actor->squashfs_first_page(actor);
	46	}
	47	static inline void squashfs_next_page(struct squashfs_page_actor actor)
	48	{
	49	return actor->squashfs_next_page(actor);
	50	}
	51	static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
	52	{
	53	actor->squashfs_finish_page(actor);
	54	}
f268eedd PL	55	static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
	56	{
	57	actor->alloc_buffer = 0;
	58	}
0d455c12	59	#endif