[PATCH] Swap Migration V5: MPOL_MF_MOVE interface

[linux-2.6-omap-h63xx.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index edafeace301f01879e04d31c9bf9e5c01a4484e9..6da4b28b896b311f681069a3ef45ffec358d4b11 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -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;
+
+       spin_lock(&swap_lock);
+       si = swap_info + type;
+       if (si->flags & SWP_WRITEOK) {
+               nr_swap_pages--;
+               offset = scan_swap_map(si);
+               if (offset) {
+                       spin_unlock(&swap_lock);
+                       return swp_entry(type, offset);
+               }
+               nr_swap_pages++;
+       }
+       spin_unlock(&swap_lock);
+       return (swp_entry_t) {0};
+}
+
 static struct swap_info_struct * swap_info_get(swp_entry_t entry)
 {
        struct swap_info_struct * p;