From: Jiri Slaby <jirislaby@gmail.com>
The first sector knowledge is swap only specific. Move it into the
handle. This will be needed for later non-swap specific code moving
inside snapshot.c.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Nigel Cunningham <ncunningham@crca.org.au>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
---
kernel/power/swap.c | 76 +++++++++++++++++++++++++-------------------------
1 files changed, 38 insertions(+), 38 deletions(-)
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index d4ff0d1..a1cff28 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -28,6 +28,40 @@
#define SWSUSP_SIG "S1SUSPEND"
+/*
+ * The swap map is a data structure used for keeping track of each page
+ * written to a swap partition. It consists of many swap_map_page
+ * structures that contain each an array of MAP_PAGE_SIZE swap entries.
+ * These structures are stored on the swap and linked together with the
+ * help of the .next_swap member.
+ *
+ * The swap map is created during suspend. The swap map pages are
+ * allocated and populated one at a time, so we only need one memory
+ * page to set up the entire structure.
+ *
+ * During resume we also only need to use one swap_map_page structure
+ * at a time.
+ */
+
+#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
+
+struct swap_map_page {
+ sector_t entries[MAP_PAGE_ENTRIES];
+ sector_t next_swap;
+};
+
+/**
+ * The swap_map_handle structure is used for handling swap in
+ * a file-alike way
+ */
+
+struct swap_map_handle {
+ struct swap_map_page *cur;
+ sector_t cur_swap;
+ sector_t first_sector;
+ unsigned int k;
+};
+
struct swsusp_header {
char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)];
sector_t image;
@@ -150,7 +184,7 @@ struct block_device *sws_resume_bdev;
* Saving part
*/
-static int mark_swapfiles(sector_t start, unsigned int flags)
+static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
{
int error;
...
