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846b730e PL |
1 | #ifndef PAGE_ACTOR_H |
2 | #define PAGE_ACTOR_H | |
3 | /* | |
4 | * Copyright (c) 2013 | |
5 | * Phillip Lougher <phillip@squashfs.org.uk> | |
6 | * | |
7 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
8 | * the COPYING file in the top-level directory. | |
9 | */ | |
10 | ||
11 | struct squashfs_page_actor { | |
12 | void **page; | |
13 | int pages; | |
14 | int length; | |
15 | int next_page; | |
16 | }; | |
17 | ||
18 | static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page, | |
19 | int pages, int length) | |
20 | { | |
21 | struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL); | |
22 | ||
23 | if (actor == NULL) | |
24 | return NULL; | |
25 | ||
26 | actor->length = length ? : pages * PAGE_CACHE_SIZE; | |
27 | actor->page = page; | |
28 | actor->pages = pages; | |
29 | actor->next_page = 0; | |
30 | return actor; | |
31 | } | |
32 | ||
33 | static inline void *squashfs_first_page(struct squashfs_page_actor *actor) | |
34 | { | |
35 | actor->next_page = 1; | |
36 | return actor->page[0]; | |
37 | } | |
38 | ||
39 | static inline void *squashfs_next_page(struct squashfs_page_actor *actor) | |
40 | { | |
41 | return actor->next_page == actor->pages ? NULL : | |
42 | actor->page[actor->next_page++]; | |
43 | } | |
44 | ||
45 | static inline void squashfs_finish_page(struct squashfs_page_actor *actor) | |
46 | { | |
47 | /* empty */ | |
48 | } | |
49 | #endif |