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[mirror_ubuntu-bionic-kernel.git] / fs / squashfs / page_actor.h
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 #ifndef CONFIG_SQUASHFS_FILE_DIRECT
12 struct squashfs_page_actor {
13 void **page;
14 int pages;
15 int length;
16 int next_page;
17 };
18
19 static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page,
20 int pages, int length)
21 {
22 struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);
23
24 if (actor == NULL)
25 return NULL;
26
27 actor->length = length ? : pages * PAGE_SIZE;
28 actor->page = page;
29 actor->pages = pages;
30 actor->next_page = 0;
31 return actor;
32 }
33
34 static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
35 {
36 actor->next_page = 1;
37 return actor->page[0];
38 }
39
40 static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
41 {
42 return actor->next_page == actor->pages ? NULL :
43 actor->page[actor->next_page++];
44 }
45
46 static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
47 {
48 /* empty */
49 }
50 #else
51 struct squashfs_page_actor {
52 union {
53 void **buffer;
54 struct page **page;
55 };
56 void *pageaddr;
57 void *(*squashfs_first_page)(struct squashfs_page_actor *);
58 void *(*squashfs_next_page)(struct squashfs_page_actor *);
59 void (*squashfs_finish_page)(struct squashfs_page_actor *);
60 int pages;
61 int length;
62 int next_page;
63 };
64
65 extern struct squashfs_page_actor *squashfs_page_actor_init(void **, int, int);
66 extern struct squashfs_page_actor *squashfs_page_actor_init_special(struct page
67 **, int, int);
68 static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
69 {
70 return actor->squashfs_first_page(actor);
71 }
72 static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
73 {
74 return actor->squashfs_next_page(actor);
75 }
76 static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
77 {
78 actor->squashfs_finish_page(actor);
79 }
80 #endif
81 #endif