#ifndef PAGE_ACTOR_H #define PAGE_ACTOR_H /* * Copyright (c) 2013 * Phillip Lougher <phillip@squashfs.org.uk> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. */ #ifndef CONFIG_SQUASHFS_FILE_DIRECT struct squashfs_page_actor { void **page; int pages; int length; int next_page; }; static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page, int pages, int length) { struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL); if (actor == NULL) return NULL; actor->length = length ? : pages * PAGE_SIZE; actor->page = page; actor->pages = pages; actor->next_page = 0; return actor; } static inline void *squashfs_first_page(struct squashfs_page_actor *actor) { actor->next_page = 1; return actor->page[0]; } static inline void *squashfs_next_page(struct squashfs_page_actor *actor) { return actor->next_page == actor->pages ? NULL : actor->page[actor->next_page++]; } static inline void squashfs_finish_page(struct squashfs_page_actor *actor) { /* empty */ } #else struct squashfs_page_actor { union { void **buffer; struct page **page; }; void *pageaddr; void *(*squashfs_first_page)(struct squashfs_page_actor *); void *(*squashfs_next_page)(struct squashfs_page_actor *); void (*squashfs_finish_page)(struct squashfs_page_actor *); int pages; int length; int next_page; }; extern struct squashfs_page_actor *squashfs_page_actor_init(void **, int, int); extern struct squashfs_page_actor *squashfs_page_actor_init_special(struct page **, int, int); 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); } #endif #endif