jbd: clean up journal_try_to_free_buffers()

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

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 3a31cc2..0cedf31 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -120,36 +120,41 @@ 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 */
 };
 
 #define SWAP_CLUSTER_MAX 32
 
-#define SWAP_MAP_MAX   0x7fff
-#define SWAP_MAP_BAD   0x8000
-
+#define SWAP_MAP_MAX   0x7ffe
+#define SWAP_MAP_BAD   0x7fff
+#define SWAP_HAS_CACHE  0x8000         /* There is a swap cache of entry. */
+#define SWAP_COUNT_MASK (~SWAP_HAS_CACHE)
 /*
  * 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 {
@@ -208,9 +213,10 @@ static inline void lru_cache_add_active_file(struct page *page)
 
 /* linux/mm/vmscan.c */
 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
-                                       gfp_t gfp_mask);
+                                       gfp_t gfp_mask, nodemask_t *mask);
 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
-                                                       gfp_t gfp_mask);
+                                                 gfp_t gfp_mask, bool noswap,
+                                                 unsigned int swappiness);
 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;
@@ -230,7 +236,6 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
 }
 #endif
 
-#ifdef CONFIG_UNEVICTABLE_LRU
 extern int page_evictable(struct page *page, struct vm_area_struct *vma);
 extern void scan_mapping_unevictable_pages(struct address_space *);
 
@@ -239,24 +244,6 @@ extern int scan_unevictable_handler(struct ctl_table *, int, struct file *,
                                        void __user *, size_t *, loff_t *);
 extern int scan_unevictable_register_node(struct node *node);
 extern void scan_unevictable_unregister_node(struct node *node);
-#else
-static inline int page_evictable(struct page *page,
-                                               struct vm_area_struct *vma)
-{
-       return 1;
-}
-
-static inline void scan_mapping_unevictable_pages(struct address_space *mapping)
-{
-}
-
-static inline int scan_unevictable_register_node(struct node *node)
-{
-       return 0;
-}
-
-static inline void scan_unevictable_unregister_node(struct node *node) { }
-#endif
 
 extern int kswapd_run(int nid);
 
@@ -269,7 +256,7 @@ extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
 
 #ifdef CONFIG_SWAP
 /* linux/mm/page_io.c */
-extern int swap_readpage(struct file *, struct page *);
+extern int swap_readpage(struct page *);
 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
 extern void end_swap_bio_read(struct bio *bio, int err);
 
@@ -295,10 +282,12 @@ extern long total_swap_pages;
 extern void si_swapinfo(struct sysinfo *);
 extern swp_entry_t get_swap_page(void);
 extern swp_entry_t get_swap_page_of_type(int);
-extern int swap_duplicate(swp_entry_t);
+extern void swap_duplicate(swp_entry_t);
+extern int swapcache_prepare(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 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);
@@ -329,6 +318,22 @@ static inline void disable_swap_token(void)
        put_swap_token(swap_token_mm);
 }
 
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+extern void mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent);
+#else
+static inline void
+mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent)
+{
+}
+#endif
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
+extern void mem_cgroup_uncharge_swap(swp_entry_t ent);
+#else
+static inline void mem_cgroup_uncharge_swap(swp_entry_t ent)
+{
+}
+#endif
+
 #else /* CONFIG_SWAP */
 
 #define nr_swap_pages                          0L
@@ -348,16 +353,18 @@ static inline void show_swap_cache_info(void)
 {
 }
 
-static inline void free_swap_and_cache(swp_entry_t swp)
+#define free_swap_and_cache(swp)       is_migration_entry(swp)
+#define swapcache_prepare(swp)         is_migration_entry(swp)
+
+static inline void swap_duplicate(swp_entry_t swp)
 {
 }
 
-static inline int swap_duplicate(swp_entry_t swp)
+static inline void swap_free(swp_entry_t swp)
 {
-       return 0;
 }
 
-static inline void swap_free(swp_entry_t swp)
+static inline void swapcache_free(swp_entry_t swp, struct page *page)
 {
 }
 
@@ -367,6 +374,11 @@ static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
        return NULL;
 }
 
+static inline int swap_writepage(struct page *p, struct writeback_control *wbc)
+{
+       return 0;
+}
+
 static inline struct page *lookup_swap_cache(swp_entry_t swp)
 {
        return NULL;
@@ -411,6 +423,17 @@ static inline swp_entry_t get_swap_page(void)
 #define has_swap_token(x) 0
 #define disable_swap_token() do { } while(0)
 
+static inline int mem_cgroup_cache_charge_swapin(struct page *page,
+                       struct mm_struct *mm, gfp_t mask, bool locked)
+{
+       return 0;
+}
+
+static inline void
+mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent)
+{
+}
+
 #endif /* CONFIG_SWAP */
 #endif /* __KERNEL__*/
 #endif /* _LINUX_SWAP_H */