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-rw-r--r--include/linux/swap.h67
1 files changed, 42 insertions, 25 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4ec9001..a2602a8 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -145,38 +145,43 @@ enum {
SWP_DISCARDABLE = (1 << 2), /* blkdev supports discard */
SWP_DISCARDING = (1 << 3), /* now discarding a free cluster */
SWP_SOLIDSTATE = (1 << 4), /* blkdev seeks are cheap */
+ SWP_CONTINUED = (1 << 5), /* swap_map has count continuation */
/* add others here before... */
SWP_SCANNING = (1 << 8), /* refcount in scan_swap_map */
};
#define SWAP_CLUSTER_MAX 32
-#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)
+#define SWAP_MAP_MAX 0x3e /* Max duplication count, in first swap_map */
+#define SWAP_MAP_BAD 0x3f /* Note pageblock is bad, in first swap_map */
+#define SWAP_HAS_CACHE 0x40 /* Flag page is cached, in first swap_map */
+#define SWAP_CONT_MAX 0x7f /* Max count, in each swap_map continuation */
+#define COUNT_CONTINUED 0x80 /* See swap_map continuation for full count */
+#define SWAP_MAP_SHMEM 0xbf /* Owned by shmem/tmpfs, in first swap_map */
+
/*
* 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 */
- struct file *swap_file;
- struct block_device *bdev;
- struct list_head extent_list;
- struct swap_extent *curr_swap_extent;
- unsigned short *swap_map;
- unsigned int lowest_bit;
- unsigned int highest_bit;
+ 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 */
+ unsigned int max; /* extent of the swap_map */
+ unsigned char *swap_map; /* vmalloc'ed array of usage counts */
+ unsigned int lowest_bit; /* index of first free in swap_map */
+ unsigned int highest_bit; /* index of last free in swap_map */
+ unsigned int pages; /* total of usable pages of swap */
+ unsigned int inuse_pages; /* number of those currently in use */
+ unsigned int cluster_next; /* likely index for next allocation */
+ unsigned int cluster_nr; /* countdown to next cluster search */
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;
- unsigned int old_block_size;
+ struct swap_extent *curr_swap_extent;
+ struct swap_extent first_swap_extent;
+ struct block_device *bdev; /* swap device or bdev of swap file */
+ struct file *swap_file; /* seldom referenced */
+ unsigned int old_block_size; /* seldom referenced */
};
struct swap_list_t {
@@ -273,6 +278,7 @@ 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 */
@@ -309,17 +315,18 @@ 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 void swap_duplicate(swp_entry_t);
-extern int swapcache_prepare(swp_entry_t);
extern int valid_swaphandles(swp_entry_t, unsigned long *);
+extern int add_swap_count_continuation(swp_entry_t, gfp_t);
+extern void swap_shmem_alloc(swp_entry_t);
+extern int swap_duplicate(swp_entry_t);
+extern int swapcache_prepare(swp_entry_t);
extern void swap_free(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);
+extern sector_t map_swap_page(struct page *, 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;
@@ -384,8 +391,18 @@ static inline void show_swap_cache_info(void)
#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 add_swap_count_continuation(swp_entry_t swp, gfp_t gfp_mask)
{
+ return 0;
+}
+
+static inline void swap_shmem_alloc(swp_entry_t swp)
+{
+}
+
+static inline int swap_duplicate(swp_entry_t swp)
+{
+ return 0;
}
static inline void swap_free(swp_entry_t swp)
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