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); 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 } 41 static inline void *squashfs_first_page(struct squashfs_page_actor *actor) 42 { 43 return actor->squashfs_first_page(actor); 44 } 45 static inline void *squashfs_next_page(struct squashfs_page_actor *actor) 46 { 47 return actor->squashfs_next_page(actor); 48 } 49 static inline void squashfs_finish_page(struct squashfs_page_actor *actor) 50 { 51 actor->squashfs_finish_page(actor); 52 } 53 static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor) 54 { 55 actor->alloc_buffer = 0; 56 } 57 #endif 58