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20c8ccb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
846b730e PL |
2 | #ifndef PAGE_ACTOR_H |
3 | #define PAGE_ACTOR_H | |
4 | /* | |
5 | * Copyright (c) 2013 | |
6 | * Phillip Lougher <phillip@squashfs.org.uk> | |
846b730e PL |
7 | */ |
8 | ||
0d455c12 | 9 | #ifndef CONFIG_SQUASHFS_FILE_DIRECT |
846b730e PL |
10 | struct squashfs_page_actor { |
11 | void **page; | |
12 | int pages; | |
13 | int length; | |
14 | int next_page; | |
15 | }; | |
16 | ||
17 | static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page, | |
18 | int pages, int length) | |
19 | { | |
20 | struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL); | |
21 | ||
22 | if (actor == NULL) | |
23 | return NULL; | |
24 | ||
09cbfeaf | 25 | actor->length = length ? : pages * PAGE_SIZE; |
846b730e PL |
26 | actor->page = page; |
27 | actor->pages = pages; | |
28 | actor->next_page = 0; | |
29 | return actor; | |
30 | } | |
31 | ||
32 | static inline void *squashfs_first_page(struct squashfs_page_actor *actor) | |
33 | { | |
34 | actor->next_page = 1; | |
35 | return actor->page[0]; | |
36 | } | |
37 | ||
38 | static inline void *squashfs_next_page(struct squashfs_page_actor *actor) | |
39 | { | |
40 | return actor->next_page == actor->pages ? NULL : | |
41 | actor->page[actor->next_page++]; | |
42 | } | |
43 | ||
44 | static inline void squashfs_finish_page(struct squashfs_page_actor *actor) | |
45 | { | |
46 | /* empty */ | |
47 | } | |
0d455c12 PL |
48 | #else |
49 | struct squashfs_page_actor { | |
50 | union { | |
51 | void **buffer; | |
52 | struct page **page; | |
53 | }; | |
54 | void *pageaddr; | |
55 | void *(*squashfs_first_page)(struct squashfs_page_actor *); | |
56 | void *(*squashfs_next_page)(struct squashfs_page_actor *); | |
57 | void (*squashfs_finish_page)(struct squashfs_page_actor *); | |
58 | int pages; | |
59 | int length; | |
60 | int next_page; | |
61 | }; | |
62 | ||
63 | extern struct squashfs_page_actor *squashfs_page_actor_init(void **, int, int); | |
64 | extern struct squashfs_page_actor *squashfs_page_actor_init_special(struct page | |
65 | **, int, int); | |
66 | static inline void *squashfs_first_page(struct squashfs_page_actor *actor) | |
67 | { | |
68 | return actor->squashfs_first_page(actor); | |
69 | } | |
70 | static inline void *squashfs_next_page(struct squashfs_page_actor *actor) | |
71 | { | |
72 | return actor->squashfs_next_page(actor); | |
73 | } | |
74 | static inline void squashfs_finish_page(struct squashfs_page_actor *actor) | |
75 | { | |
76 | actor->squashfs_finish_page(actor); | |
77 | } | |
78 | #endif | |
846b730e | 79 | #endif |