Commit 3a291a20 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Linus Torvalds
Browse files

[PATCH] mm: add a new function (needed for swap suspend)

This adds the function get_swap_page_of_type() allowing us to specify an index
in swap_info[] and select a swap_info_struct structure to be used for
allocating a swap page.

This function (or another one of similar functionality) will be necessary for
implementing the image-writing part of swsusp in the user space.   It can also
be used for simplifying the current in-kernel implementation of the
image-writing part of swsusp.
Signed-off-by: default avatarRafael J. Wysocki <>
Acked-by: default avatarPavel Machek <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent ca0aec0f
......@@ -209,6 +209,7 @@ extern unsigned int nr_swapfiles;
extern struct swap_info_struct swap_info[];
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t get_swap_page(void);
extern swp_entry_t get_swap_page_of_type(int type);
extern int swap_duplicate(swp_entry_t);
extern int valid_swaphandles(swp_entry_t, unsigned long *);
extern void swap_free(swp_entry_t);
......@@ -211,6 +211,26 @@ noswap:
return (swp_entry_t) {0};
swp_entry_t get_swap_page_of_type(int type)
struct swap_info_struct *si;
pgoff_t offset;
si = swap_info + type;
if (si->flags & SWP_WRITEOK) {
offset = scan_swap_map(si);
if (offset) {
return swp_entry(type, offset);
return (swp_entry_t) {0};
static struct swap_info_struct * swap_info_get(swp_entry_t entry)
struct swap_info_struct * p;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment