1 files changed, 24 insertions, 30 deletions

diff --git a/include/linux/swap.h b/include/linux/swap.h
index a3af95b2cb6d..91dee50fe260 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -120,7 +120,9 @@ struct swap_extent {
 enum {
         SWP_USED        = (1 << 0),     /* is slot in swap_info[] used? */
         SWP_WRITEOK     = (1 << 1),     /* ok to write to this swap?    */
-        SWP_ACTIVE      = (SWP_USED | SWP_WRITEOK),
+        SWP_DISCARDABLE = (1 << 2),     /* blkdev supports discard */
+        SWP_DISCARDING  = (1 << 3),     /* now discarding a free cluster */
+        SWP_SOLIDSTATE  = (1 << 4),     /* blkdev seeks are cheap */
                                         /* add others here before... */
         SWP_SCANNING    = (1 << 8),     /* refcount in scan_swap_map */
 };
@@ -134,22 +136,24 @@ enum {
  * The in-memory structure used to track swap areas.
  */
 struct swap_info_struct {
-        unsigned int flags;
+        unsigned long flags;
         int prio;                       /* swap priority */
+        int next;                       /* next entry on swap list */
         struct file *swap_file;
         struct block_device *bdev;
         struct list_head extent_list;
         struct swap_extent *curr_swap_extent;
-        unsigned old_block_size;
-        unsigned short * swap_map;
+        unsigned short *swap_map;
         unsigned int lowest_bit;
         unsigned int highest_bit;
+        unsigned int lowest_alloc;      /* while preparing discard cluster */
+        unsigned int highest_alloc;     /* while preparing discard cluster */
         unsigned int cluster_next;
         unsigned int cluster_nr;
         unsigned int pages;
         unsigned int max;
         unsigned int inuse_pages;
-        int next;                       /* next entry on swap list */
+        unsigned int old_block_size;
 };
 
 struct swap_list_t {
@@ -163,7 +167,6 @@ struct swap_list_t {
 /* linux/mm/page_alloc.c */
 extern unsigned long totalram_pages;
 extern unsigned long totalreserve_pages;
-extern long nr_swap_pages;
 extern unsigned int nr_free_buffer_pages(void);
 extern unsigned int nr_free_pagecache_pages(void);
 
@@ -174,8 +177,6 @@ extern unsigned int nr_free_pagecache_pages(void);
 /* linux/mm/swap.c */
 extern void __lru_cache_add(struct page *, enum lru_list lru);
 extern void lru_cache_add_lru(struct page *, enum lru_list lru);
-extern void lru_cache_add_active_or_unevictable(struct page *,
-                                        struct vm_area_struct *);
 extern void activate_page(struct page *);
 extern void mark_page_accessed(struct page *);
 extern void lru_add_drain(void);
@@ -280,7 +281,7 @@ extern void end_swap_bio_read(struct bio *bio, int err);
 extern struct address_space swapper_space;
 #define total_swapcache_pages  swapper_space.nrpages
 extern void show_swap_cache_info(void);
-extern int add_to_swap(struct page *, gfp_t);
+extern int add_to_swap(struct page *);
 extern int add_to_swap_cache(struct page *, swp_entry_t, gfp_t);
 extern void __delete_from_swap_cache(struct page *);
 extern void delete_from_swap_cache(struct page *);
@@ -293,6 +294,7 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t,
                         struct vm_area_struct *vma, unsigned long addr);
 
 /* linux/mm/swapfile.c */
+extern long nr_swap_pages;
 extern long total_swap_pages;
 extern void si_swapinfo(struct sysinfo *);
 extern swp_entry_t get_swap_page(void);
@@ -300,15 +302,14 @@ extern swp_entry_t get_swap_page_of_type(int);
 extern int swap_duplicate(swp_entry_t);
 extern int valid_swaphandles(swp_entry_t, unsigned long *);
 extern void swap_free(swp_entry_t);
-extern void free_swap_and_cache(swp_entry_t);
+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 swapdev_block(int, pgoff_t);
 extern struct swap_info_struct *get_swap_info_struct(unsigned);
-extern int can_share_swap_page(struct page *);
-extern int remove_exclusive_swap_page(struct page *);
-extern int remove_exclusive_swap_page_ref(struct page *);
+extern int reuse_swap_page(struct page *);
+extern int try_to_free_swap(struct page *);
 struct backing_dev_info;
 
 /* linux/mm/thrash.c */
@@ -334,7 +335,8 @@ static inline void disable_swap_token(void)
 
 #else /* CONFIG_SWAP */
 
-#define total_swap_pages                        0
+#define nr_swap_pages                           0L
+#define total_swap_pages                        0L
 #define total_swapcache_pages                   0UL
 
 #define si_swapinfo(val) \
@@ -350,14 +352,8 @@ static inline void show_swap_cache_info(void)
 {
 }
 
-static inline void free_swap_and_cache(swp_entry_t swp)
-{
-}
-
-static inline int swap_duplicate(swp_entry_t swp)
-{
-        return 0;
-}
+#define free_swap_and_cache(swp)        is_migration_entry(swp)
+#define swap_duplicate(swp)             is_migration_entry(swp)
 
 static inline void swap_free(swp_entry_t swp)
 {
@@ -374,7 +370,10 @@ static inline struct page *lookup_swap_cache(swp_entry_t swp)
         return NULL;
 }
 
-#define can_share_swap_page(p)                  (page_mapcount(p) == 1)
+static inline int add_to_swap(struct page *page)
+{
+        return 0;
+}
 
 static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
                                                         gfp_t gfp_mask)
@@ -390,14 +389,9 @@ static inline void delete_from_swap_cache(struct page *page)
 {
 }
 
-#define swap_token_default_timeout              0
-
-static inline int remove_exclusive_swap_page(struct page *p)
-{
-        return 0;
-}
+#define reuse_swap_page(page)   (page_mapcount(page) == 1)
 
-static inline int remove_exclusive_swap_page_ref(struct page *page)
+static inline int try_to_free_swap(struct page *page)
 {
         return 0;
 }