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 58