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 */
/* add others here before... */
SWP_SCANNING = (1 << 8), /* refcount in scan_swap_map */
};
* 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 {
/* 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);
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 *);
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);
#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) \
return NULL;
}
+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)
{