swap_info: change to array of pointers

[safe/jmp/linux-2.6] / include / linux / swap.h

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 7c15334..f1c2487 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -34,15 +34,37 @@ static inline int current_is_kswapd(void)
  * the type/offset into the pte as 5/27 as well.
  */
 #define MAX_SWAPFILES_SHIFT    5
-#ifndef CONFIG_MIGRATION
-#define MAX_SWAPFILES          (1 << MAX_SWAPFILES_SHIFT)
+
+/*
+ * Use some of the swap files numbers for other purposes. This
+ * is a convenient way to hook into the VM to trigger special
+ * actions on faults.
+ */
+
+/*
+ * NUMA node memory migration support
+ */
+#ifdef CONFIG_MIGRATION
+#define SWP_MIGRATION_NUM 2
+#define SWP_MIGRATION_READ     (MAX_SWAPFILES + SWP_HWPOISON_NUM)
+#define SWP_MIGRATION_WRITE    (MAX_SWAPFILES + SWP_HWPOISON_NUM + 1)
+#else
+#define SWP_MIGRATION_NUM 0
+#endif
+
+/*
+ * Handling of hardware poisoned pages with memory corruption.
+ */
+#ifdef CONFIG_MEMORY_FAILURE
+#define SWP_HWPOISON_NUM 1
+#define SWP_HWPOISON           MAX_SWAPFILES
 #else
-/* Use last two entries for page migration swap entries */
-#define MAX_SWAPFILES          ((1 << MAX_SWAPFILES_SHIFT)-2)
-#define SWP_MIGRATION_READ     MAX_SWAPFILES
-#define SWP_MIGRATION_WRITE    (MAX_SWAPFILES + 1)
+#define SWP_HWPOISON_NUM 0
 #endif
 
+#define MAX_SWAPFILES \
+       ((1 << MAX_SWAPFILES_SHIFT) - SWP_MIGRATION_NUM - SWP_HWPOISON_NUM)
+
 /*
  * Magic header for a swap area. The first part of the union is
  * what the swap magic looks like for the old (limited to 128MB)
@@ -137,9 +159,10 @@ enum {
  * The in-memory structure used to track swap areas.
  */
 struct swap_info_struct {
-       unsigned long flags;
-       int prio;                       /* swap priority */
-       int next;                       /* next entry on swap list */
+       unsigned long   flags;          /* SWP_USED etc: see above */
+       signed short    prio;           /* swap priority of this type */
+       signed char     type;           /* strange name for an index */
+       signed char     next;           /* next type on the swap list */
        struct file *swap_file;
        struct block_device *bdev;
        struct list_head extent_list;
@@ -217,6 +240,11 @@ extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
                                                  gfp_t gfp_mask, bool noswap,
                                                  unsigned int swappiness);
+extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
+                                               gfp_t gfp_mask, bool noswap,
+                                               unsigned int swappiness,
+                                               struct zone *zone,
+                                               int nid);
 extern int __isolate_lru_page(struct page *page, int mode, int file);
 extern unsigned long shrink_all_memory(unsigned long nr_pages);
 extern int vm_swappiness;
@@ -240,12 +268,13 @@ extern int page_evictable(struct page *page, struct vm_area_struct *vma);
 extern void scan_mapping_unevictable_pages(struct address_space *);
 
 extern unsigned long scan_unevictable_pages;
-extern int scan_unevictable_handler(struct ctl_table *, int, struct file *,
+extern int scan_unevictable_handler(struct ctl_table *, int,
                                        void __user *, size_t *, loff_t *);
 extern int scan_unevictable_register_node(struct node *node);
 extern void scan_unevictable_unregister_node(struct node *node);
 
 extern int kswapd_run(int nid);
+extern void kswapd_stop(int nid);
 
 #ifdef CONFIG_MMU
 /* linux/mm/shmem.c */
@@ -290,9 +319,8 @@ extern void swapcache_free(swp_entry_t, struct page *page);
 extern int free_swap_and_cache(swp_entry_t);
 extern int swap_type_of(dev_t, sector_t, struct block_device **);
 extern unsigned int count_swap_pages(int, int);
-extern sector_t map_swap_page(struct swap_info_struct *, pgoff_t);
+extern sector_t map_swap_page(swp_entry_t, struct block_device **);
 extern sector_t swapdev_block(int, pgoff_t);
-extern struct swap_info_struct *get_swap_info_struct(unsigned);
 extern int reuse_swap_page(struct page *);
 extern int try_to_free_swap(struct page *);
 struct backing_dev_info;
@@ -419,10 +447,22 @@ static inline swp_entry_t get_swap_page(void)
 }
 
 /* linux/mm/thrash.c */
-#define put_swap_token(mm)     do { } while (0)
-#define grab_swap_token(mm)    do { } while (0)
-#define has_swap_token(mm)     0
-#define disable_swap_token()   do { } while (0)
+static inline void put_swap_token(struct mm_struct *mm)
+{
+}
+
+static inline void grab_swap_token(struct mm_struct *mm)
+{
+}
+
+static inline int has_swap_token(struct mm_struct *mm)
+{
+       return 0;
+}
+
+static inline void disable_swap_token(void)
+{
+}
 
 static inline void
 mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent)