| | 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 squashfsory. |
| | 9 | */ |
| | 10 | |
| | 11 | struct squashfs_page_actor { |
| | 12 | struct page **page; |
| | 13 | void *pageaddr; |
| | 14 | int pages; |
| | 15 | int length; |
| | 16 | int next_page; |
| | 17 | void (*release_pages)(struct page **, int, int); |
| | 18 | }; |
| | 19 | |
| | 20 | extern struct squashfs_page_actor *squashfs_page_actor_init(struct page **, |
| | 21 | int, int, void (*)(struct page **, int, int)); |
| | 22 | extern void squashfs_page_actor_free(struct squashfs_page_actor *, int); |
| | 23 | |
| | 24 | extern void squashfs_actor_to_buf(struct squashfs_page_actor *, void *, int); |
| | 25 | extern void squashfs_buf_to_actor(void *, struct squashfs_page_actor *, int); |
| | 26 | extern void squashfs_bh_to_actor(struct buffer_head **, int, |
| | 27 | struct squashfs_page_actor *, int, int, int); |
| | 28 | extern void squashfs_bh_to_buf(struct buffer_head **, int, void *, int, int, |
| | 29 | int); |
| | 30 | |
| | 31 | /* |
| | 32 | * Calling code should avoid sleeping between calls to squashfs_first_page() |
| | 33 | * and squashfs_finish_page(). |
| | 34 | */ |
| | 35 | static inline void *squashfs_first_page(struct squashfs_page_actor *actor) |
| | 36 | { |
| | 37 | actor->next_page = 1; |
| | 38 | return actor->pageaddr = actor->page[0] ? kmap_atomic(actor->page[0]) |
| | 39 | : NULL; |
| | 40 | } |
| | 41 | |
| | 42 | static inline void *squashfs_next_page(struct squashfs_page_actor *actor) |
| | 43 | { |
| | 44 | if (!IS_ERR_OR_NULL(actor->pageaddr)) |
| | 45 | kunmap_atomic(actor->pageaddr); |
| | 46 | |
| | 47 | if (actor->next_page == actor->pages) |
| | 48 | return actor->pageaddr = ERR_PTR(-ENODATA); |
| | 49 | |
| | 50 | actor->pageaddr = actor->page[actor->next_page] ? |
| | 51 | kmap_atomic(actor->page[actor->next_page]) : NULL; |
| | 52 | ++actor->next_page; |
| | 53 | return actor->pageaddr; |
| | 54 | } |
| | 55 | |
| | 56 | static inline void squashfs_finish_page(struct squashfs_page_actor *actor) |
| | 57 | { |
| | 58 | if (!IS_ERR_OR_NULL(actor->pageaddr)) |
| | 59 | kunmap_atomic(actor->pageaddr); |
| | 60 | } |
| | 61 | |
| | 62 | extern struct page **alloc_page_array(int, int); |
| | 63 | extern void free_page_array(struct page **, int); |
| | 64 | |
| | 65 | #endif |
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