From 61159a314bca6408320c3173c1282c64f5cdaa76 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 23 Mar 2006 03:00:00 -0800 Subject: [PATCH] swsusp: separate swap-writing/reading code Move the swap-writing/reading code of swsusp to a separate file. Signed-off-by: Rafael J. Wysocki Acked-by: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/power.h | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) (limited to 'kernel/power/power.h') diff --git a/kernel/power/power.h b/kernel/power/power.h index ea7132ed029b..089c84bed895 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -41,8 +41,8 @@ extern struct pbe *pagedir_nosave; /* Preferred image size in bytes (default 500 MB) */ extern unsigned long image_size; - extern int in_suspend; +extern dev_t swsusp_resume_device; extern asmlinkage int swsusp_arch_suspend(void); extern asmlinkage int swsusp_arch_resume(void); @@ -65,3 +65,32 @@ struct snapshot_handle { extern int snapshot_read_next(struct snapshot_handle *handle, size_t count); extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); int snapshot_image_loaded(struct snapshot_handle *handle); + +/** + * The bitmap is used for tracing allocated swap pages + * + * The entire bitmap consists of a number of bitmap_page + * structures linked with the help of the .next member. + * Thus each page can be allocated individually, so we only + * need to make 0-order memory allocations to create + * the bitmap. + */ + +#define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *)) +#define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long)) +#define BITS_PER_CHUNK (sizeof(long) * 8) +#define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK) + +struct bitmap_page { + unsigned long chunks[BITMAP_PAGE_CHUNKS]; + struct bitmap_page *next; +}; + +extern void free_bitmap(struct bitmap_page *bitmap); +extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits); +extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap); +extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap); + +extern int swsusp_shrink_memory(void); +extern int swsusp_suspend(void); +extern int swsusp_resume(void); -- cgit v1.2.1