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/* 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
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