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 loff_t start_index);
34 static inline struct page *squashfs_page_actor_free(struct squashfs_page_actor *actor)
35 {
36 struct page *last_page = actor->next_page == actor->pages ? actor->last_page : ERR_PTR(-EIO);
37
38 kfree(actor->tmp_buffer);
39 kfree(actor);
40
41 return last_page;
42 }
43 static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
44 {
45 return actor->squashfs_first_page(actor);
46 }
47 static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
48 {
49 return actor->squashfs_next_page(actor);
50 }
51 static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
52 {
53 actor->squashfs_finish_page(actor);
54 }
55 static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
56 {
57 actor->alloc_buffer = 0;
58 }
59 #endif
60
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