int cpus;
unsigned long image_pages;
unsigned long pages;
- unsigned long size;
} __attribute__((aligned(PAGE_SIZE)));
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
+extern unsigned int nr_copy_pages;
extern struct pbe *pagedir_nosave;
/* Preferred image size in bytes (default 500 MB) */
extern unsigned long image_size;
-extern int in_suspend;
-extern dev_t swsusp_resume_device;
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);
extern unsigned int count_data_pages(void);
-
-/**
- * Auxiliary structure used for reading the snapshot image data and
- * metadata from and writing them to the list of page backup entries
- * (PBEs) which is the main data structure of swsusp.
- *
- * Using struct snapshot_handle we can transfer the image, including its
- * metadata, as a continuous sequence of bytes with the help of
- * snapshot_read_next() and snapshot_write_next().
- *
- * The code that writes the image to a storage or transfers it to
- * the user land is required to use snapshot_read_next() for this
- * purpose and it should not make any assumptions regarding the internal
- * structure of the image. Similarly, the code that reads the image from
- * a storage or transfers it from the user land is required to use
- * snapshot_write_next().
- *
- * This may allow us to change the internal structure of the image
- * in the future with considerably less effort.
- */
-
-struct snapshot_handle {
- loff_t offset; /* number of the last byte ready for reading
- * or writing in the sequence
- */
- unsigned int cur; /* number of the block of PAGE_SIZE bytes the
- * next operation will refer to (ie. current)
- */
- unsigned int cur_offset; /* offset with respect to the current
- * block (for the next operation)
- */
- unsigned int prev; /* number of the block of PAGE_SIZE bytes that
- * was the current one previously
- */
- struct pbe *pbe; /* PBE that corresponds to 'buffer' */
- struct pbe *last_pbe; /* When the image is restored (eg. read
- * from disk) we can store some image
- * data directly in the page frames
- * in which they were before suspend.
- * In such a case the PBEs that
- * correspond to them will be unused.
- * This is the last PBE, so far, that
- * does not correspond to such data.
- */
- void *buffer; /* address of the block to read from
- * or write to
- */
- unsigned int buf_offset; /* location to read from or write to,
- * given as a displacement from 'buffer'
- */
- int sync_read; /* Set to one to notify the caller of
- * snapshot_write_next() that it may
- * need to call wait_on_bio_chain()
- */
-};
-
-/* This macro returns the address from/to which the caller of
- * snapshot_read_next()/snapshot_write_next() is allowed to
- * read/write data after the function returns
- */
-#define data_of(handle) ((handle).buffer + (handle).buf_offset)
-
-extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
-extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
-int snapshot_image_loaded(struct snapshot_handle *handle);
-
-#define SNAPSHOT_IOC_MAGIC '3'
-#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
-#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
-#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
-#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
-#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
-#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
-#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
-#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
-#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
-#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
-#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
-#define SNAPSHOT_IOC_MAXNR 11
-
-/**
- * The bitmap is used for tracing allocated swap pages
- *
- * The entire bitmap consists of a number of bitmap_page
- * structures linked with the help of the .next member.
- * Thus each page can be allocated individually, so we only
- * need to make 0-order memory allocations to create
- * the bitmap.
- */
-
-#define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
-#define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
-#define BITS_PER_CHUNK (sizeof(long) * 8)
-#define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
-
-struct bitmap_page {
- unsigned long chunks[BITMAP_PAGE_CHUNKS];
- struct bitmap_page *next;
-};
-
-extern void free_bitmap(struct bitmap_page *bitmap);
-extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
-extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
-extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
-
-extern int swsusp_check(void);
-extern int swsusp_shrink_memory(void);
+extern void free_pagedir(struct pbe *pblist);
+extern void release_eaten_pages(void);
+extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed);
extern void swsusp_free(void);
-extern int swsusp_suspend(void);
-extern int swsusp_resume(void);
-extern int swsusp_read(void);
-extern int swsusp_write(void);
-extern void swsusp_close(void);
-extern int suspend_enter(suspend_state_t state);
+extern int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed);
+extern unsigned int snapshot_nr_pages(void);
+extern struct pbe *snapshot_pblist(void);
+extern void snapshot_pblist_set(struct pbe *pblist);
git://git.onelab.eu / linux-2.6.git / blobdiff