fs/squashfs/page_actor.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 #ifndef PAGE_ACTOR_H
0003 #define PAGE_ACTOR_H
0004 /*
0005  * Copyright (c) 2013
0006  * Phillip Lougher <phillip@squashfs.org.uk>
0007  */
0008
0009 struct squashfs_page_actor {
0010     union {
0011         void        **buffer;
0012         struct page **page;
0013     };
0014     void    *pageaddr;
0015     void    *tmp_buffer;
0016     void    *(*squashfs_first_page)(struct squashfs_page_actor *);
0017     void    *(*squashfs_next_page)(struct squashfs_page_actor *);
0018     void    (*squashfs_finish_page)(struct squashfs_page_actor *);
0019     int pages;
0020     int length;
0021     int next_page;
0022     int alloc_buffer;
0023     int returned_pages;
0024     pgoff_t next_index;
0025 };
0026
0027 extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
0028                 int pages, int length);
0029 extern struct squashfs_page_actor *squashfs_page_actor_init_special(
0030                 struct squashfs_sb_info *msblk,
0031                 struct page **page, int pages, int length);
0032 static inline void squashfs_page_actor_free(struct squashfs_page_actor *actor)
0033 {
0034     kfree(actor->tmp_buffer);
0035     kfree(actor);
0036 }
0037 static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
0038 {
0039     return actor->squashfs_first_page(actor);
0040 }
0041 static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
0042 {
0043     return actor->squashfs_next_page(actor);
0044 }
0045 static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
0046 {
0047     actor->squashfs_finish_page(actor);
0048 }
0049 static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
0050 {
0051     actor->alloc_buffer = 0;
0052 }
0053 #endif