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authorRafael J. Wysocki <rjw@sisk.pl>2006-03-23 03:00:00 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 07:38:07 -0800
commit61159a314bca6408320c3173c1282c64f5cdaa76 (patch)
tree8e1b7627443da0fd52b2fac66366dde9f7871f1e /kernel/power/power.h
parentf577eb30afdc68233f25d4d82b04102129262365 (diff)
downloadlwn-61159a314bca6408320c3173c1282c64f5cdaa76.tar.gz
lwn-61159a314bca6408320c3173c1282c64f5cdaa76.zip
[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 <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power/power.h')
-rw-r--r--kernel/power/power.h31
1 files changed, 30 insertions, 1 deletions
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);