check in the original version of dde linux26.

1 files changed, 437 insertions, 0 deletions

diff --git a/libdde_linux26/contrib/include/linux/swap.h b/libdde_linux26/contrib/include/linux/swap.h
new file mode 100644
index 00000000..d3021557
--- /dev/null
+++ b/libdde_linux26/contrib/include/linux/swap.h
@@ -0,0 +1,437 @@
+#ifndef _LINUX_SWAP_H
+#define _LINUX_SWAP_H
+
+#include <linux/spinlock.h>
+#include <linux/linkage.h>
+#include <linux/mmzone.h>
+#include <linux/list.h>
+#include <linux/memcontrol.h>
+#include <linux/sched.h>
+#include <linux/node.h>
+
+#include <asm/atomic.h>
+#include <asm/page.h>
+
+struct notifier_block;
+
+struct bio;
+
+#define SWAP_FLAG_PREFER	0x8000	/* set if swap priority specified */
+#define SWAP_FLAG_PRIO_MASK	0x7fff
+#define SWAP_FLAG_PRIO_SHIFT	0
+
+static inline int current_is_kswapd(void)
+{
+	return current->flags & PF_KSWAPD;
+}
+
+/*
+ * MAX_SWAPFILES defines the maximum number of swaptypes: things which can
+ * be swapped to.  The swap type and the offset into that swap type are
+ * encoded into pte's and into pgoff_t's in the swapcache.  Using five bits
+ * for the type means that the maximum number of swapcache pages is 27 bits
+ * on 32-bit-pgoff_t architectures.  And that assumes that the architecture packs
+ * 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)
+#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)
+#endif
+
+/*
+ * 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)
+ * swap area format, the second part of the union adds - in the
+ * old reserved area - some extra information. Note that the first
+ * kilobyte is reserved for boot loader or disk label stuff...
+ *
+ * Having the magic at the end of the PAGE_SIZE makes detecting swap
+ * areas somewhat tricky on machines that support multiple page sizes.
+ * For 2.5 we'll probably want to move the magic to just beyond the
+ * bootbits...
+ */
+union swap_header {
+	struct {
+		char reserved[PAGE_SIZE - 10];
+		char magic[10];			/* SWAP-SPACE or SWAPSPACE2 */
+	} magic;
+	struct {
+		char		bootbits[1024];	/* Space for disklabel etc. */
+		__u32		version;
+		__u32		last_page;
+		__u32		nr_badpages;
+		unsigned char	sws_uuid[16];
+		unsigned char	sws_volume[16];
+		__u32		padding[117];
+		__u32		badpages[1];
+	} info;
+};
+
+ /* A swap entry has to fit into a "unsigned long", as
+  * the entry is hidden in the "index" field of the
+  * swapper address space.
+  */
+typedef struct {
+	unsigned long val;
+} swp_entry_t;
+
+/*
+ * current->reclaim_state points to one of these when a task is running
+ * memory reclaim
+ */
+struct reclaim_state {
+	unsigned long reclaimed_slab;
+};
+
+#ifdef __KERNEL__
+
+struct address_space;
+struct sysinfo;
+struct writeback_control;
+struct zone;
+
+/*
+ * A swap extent maps a range of a swapfile's PAGE_SIZE pages onto a range of
+ * disk blocks.  A list of swap extents maps the entire swapfile.  (Where the
+ * term `swapfile' refers to either a blockdevice or an IS_REG file.  Apart
+ * from setup, they're handled identically.
+ *
+ * We always assume that blocks are of size PAGE_SIZE.
+ */
+struct swap_extent {
+	struct list_head list;
+	pgoff_t start_page;
+	pgoff_t nr_pages;
+	sector_t start_block;
+};
+
+/*
+ * Max bad pages in the new format..
+ */
+#define __swapoffset(x) ((unsigned long)&((union swap_header *)0)->x)
+#define MAX_SWAP_BADPAGES \
+	((__swapoffset(magic.magic) - __swapoffset(info.badpages)) / sizeof(int))
+
+enum {
+	SWP_USED	= (1 << 0),	/* is slot in swap_info[] used? */
+	SWP_WRITEOK	= (1 << 1),	/* ok to write to this swap?	*/
+	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
+
+/*
+ * 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 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_list_t {
+	int head;	/* head of priority-ordered swapfile list */
+	int next;	/* swapfile to be used next */
+};
+
+/* Swap 50% full? Release swapcache more aggressively.. */
+#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages)
+
+/* linux/mm/page_alloc.c */
+extern unsigned long totalram_pages;
+extern unsigned long totalreserve_pages;
+extern unsigned int nr_free_buffer_pages(void);
+extern unsigned int nr_free_pagecache_pages(void);
+
+/* Definition of global_page_state not available yet */
+#define nr_free_pages() global_page_state(NR_FREE_PAGES)
+
+
+/* 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 activate_page(struct page *);
+extern void mark_page_accessed(struct page *);
+extern void lru_add_drain(void);
+extern int lru_add_drain_all(void);
+extern void rotate_reclaimable_page(struct page *page);
+extern void swap_setup(void);
+
+extern void add_page_to_unevictable_list(struct page *page);
+
+/**
+ * lru_cache_add: add a page to the page lists
+ * @page: the page to add
+ */
+static inline void lru_cache_add_anon(struct page *page)
+{
+	__lru_cache_add(page, LRU_INACTIVE_ANON);
+}
+
+static inline void lru_cache_add_active_anon(struct page *page)
+{
+	__lru_cache_add(page, LRU_ACTIVE_ANON);
+}
+
+static inline void lru_cache_add_file(struct page *page)
+{
+	__lru_cache_add(page, LRU_INACTIVE_FILE);
+}
+
+static inline void lru_cache_add_active_file(struct page *page)
+{
+	__lru_cache_add(page, LRU_ACTIVE_FILE);
+}
+
+/* linux/mm/vmscan.c */
+extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
+					gfp_t gfp_mask);
+extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
+						  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;
+extern int remove_mapping(struct address_space *mapping, struct page *page);
+extern long vm_total_pages;
+
+#ifdef CONFIG_NUMA
+extern int zone_reclaim_mode;
+extern int sysctl_min_unmapped_ratio;
+extern int sysctl_min_slab_ratio;
+extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
+#else
+#define zone_reclaim_mode 0
+static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
+{
+	return 0;
+}
+#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 *);
+
+extern unsigned long scan_unevictable_pages;
+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);
+
+#ifdef CONFIG_MMU
+/* linux/mm/shmem.c */
+extern int shmem_unuse(swp_entry_t entry, struct page *page);
+#endif /* CONFIG_MMU */
+
+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_writepage(struct page *page, struct writeback_control *wbc);
+extern void end_swap_bio_read(struct bio *bio, int err);
+
+/* linux/mm/swap_state.c */
+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 *);
+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 *);
+extern void free_page_and_swap_cache(struct page *);
+extern void free_pages_and_swap_cache(struct page **, int);
+extern struct page *lookup_swap_cache(swp_entry_t);
+extern struct page *read_swap_cache_async(swp_entry_t, gfp_t,
+			struct vm_area_struct *vma, unsigned long addr);
+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);
+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 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 reuse_swap_page(struct page *);
+extern int try_to_free_swap(struct page *);
+struct backing_dev_info;
+
+/* linux/mm/thrash.c */
+extern struct mm_struct * swap_token_mm;
+extern void grab_swap_token(void);
+extern void __put_swap_token(struct mm_struct *);
+
+static inline int has_swap_token(struct mm_struct *mm)
+{
+	return (mm == swap_token_mm);
+}
+
+static inline void put_swap_token(struct mm_struct *mm)
+{
+	if (has_swap_token(mm))
+		__put_swap_token(mm);
+}
+
+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
+#define total_swap_pages			0L
+#define total_swapcache_pages			0UL
+
+#define si_swapinfo(val) \
+	do { (val)->freeswap = (val)->totalswap = 0; } while (0)
+/* only sparc can not include linux/pagemap.h in this file
+ * so leave page_cache_release and release_pages undeclared... */
+#define free_page_and_swap_cache(page) \
+	page_cache_release(page)
+#define free_pages_and_swap_cache(pages, nr) \
+	release_pages((pages), (nr), 0);
+
+static inline void show_swap_cache_info(void)
+{
+}
+
+#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)
+{
+}
+
+static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
+			struct vm_area_struct *vma, unsigned long addr)
+{
+	return NULL;
+}
+
+static inline struct page *lookup_swap_cache(swp_entry_t swp)
+{
+	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)
+{
+	return -1;
+}
+
+static inline void __delete_from_swap_cache(struct page *page)
+{
+}
+
+static inline void delete_from_swap_cache(struct page *page)
+{
+}
+
+#define reuse_swap_page(page)	(page_mapcount(page) == 1)
+
+static inline int try_to_free_swap(struct page *page)
+{
+	return 0;
+}
+
+static inline swp_entry_t get_swap_page(void)
+{
+	swp_entry_t entry;
+	entry.val = 0;
+	return entry;
+}
+
+/* linux/mm/thrash.c */
+#define put_swap_token(x) do { } while(0)
+#define grab_swap_token()  do { } while(0)
+#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;
+}
+
+#endif /* CONFIG_SWAP */
+#endif /* __KERNEL__*/
+#endif /* _LINUX_SWAP_H */