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