From 9eeaa7cce84b9fb4674d5e99fbc0c68cdff8c25a Mon Sep 17 00:00:00 2001 From: Yegor Yefremov Date: Tue, 1 Mar 2016 12:10:04 +0100 Subject: fs: add support for SquashFS 4.0 The driver was imported from Linux 4.4. Current implementation supports only XZ decompressor. Signed-off-by: Yegor Yefremov Tested-by: Antony Pavlov Signed-off-by: Sascha Hauer --- fs/squashfs/page_actor.h | 53 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 fs/squashfs/page_actor.h (limited to 'fs/squashfs/page_actor.h') diff --git a/fs/squashfs/page_actor.h b/fs/squashfs/page_actor.h new file mode 100644 index 0000000000..c07f05f397 --- /dev/null +++ b/fs/squashfs/page_actor.h @@ -0,0 +1,53 @@ +#ifndef PAGE_ACTOR_H +#define PAGE_ACTOR_H +/* + * Copyright (c) 2013 + * Phillip Lougher + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include +#include +#include + +struct squashfs_page_actor { + void **page; + int pages; + int length; + int next_page; +}; + +static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page, + int pages, int length) +{ + struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL); + + if (actor == NULL) + return NULL; + + actor->length = length ? : pages * PAGE_CACHE_SIZE; + actor->page = page; + actor->pages = pages; + actor->next_page = 0; + return actor; +} + +static inline void *squashfs_first_page(struct squashfs_page_actor *actor) +{ + actor->next_page = 1; + return actor->page[0]; +} + +static inline void *squashfs_next_page(struct squashfs_page_actor *actor) +{ + return actor->next_page == actor->pages ? NULL : + actor->page[actor->next_page++]; +} + +static inline void squashfs_finish_page(struct squashfs_page_actor *actor) +{ + /* empty */ +} +#endif -- cgit v1.2.3