61159a314b
Move the swap-writing/reading code of swsusp to a separate file. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
#include <linux/suspend.h>
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#include <linux/utsname.h>
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struct swsusp_info {
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struct new_utsname uts;
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u32 version_code;
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unsigned long num_physpages;
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int cpus;
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unsigned long image_pages;
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unsigned long pages;
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} __attribute__((aligned(PAGE_SIZE)));
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#ifdef CONFIG_SOFTWARE_SUSPEND
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extern int pm_suspend_disk(void);
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#else
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static inline int pm_suspend_disk(void)
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{
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return -EPERM;
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}
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#endif
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extern struct semaphore pm_sem;
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#define power_attr(_name) \
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static struct subsys_attribute _name##_attr = { \
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.attr = { \
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.name = __stringify(_name), \
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.mode = 0644, \
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}, \
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.show = _name##_show, \
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.store = _name##_store, \
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}
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extern struct subsystem power_subsys;
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/* References to section boundaries */
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extern const void __nosave_begin, __nosave_end;
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extern struct pbe *pagedir_nosave;
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/* Preferred image size in bytes (default 500 MB) */
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extern unsigned long image_size;
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extern int in_suspend;
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extern dev_t swsusp_resume_device;
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extern asmlinkage int swsusp_arch_suspend(void);
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extern asmlinkage int swsusp_arch_resume(void);
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extern unsigned int count_data_pages(void);
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extern void swsusp_free(void);
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struct snapshot_handle {
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loff_t offset;
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unsigned int page;
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unsigned int page_offset;
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unsigned int prev;
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struct pbe *pbe;
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void *buffer;
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unsigned int buf_offset;
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};
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#define data_of(handle) ((handle).buffer + (handle).buf_offset)
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extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
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extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
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int snapshot_image_loaded(struct snapshot_handle *handle);
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/**
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* The bitmap is used for tracing allocated swap pages
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*
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* The entire bitmap consists of a number of bitmap_page
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* structures linked with the help of the .next member.
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* Thus each page can be allocated individually, so we only
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* need to make 0-order memory allocations to create
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* the bitmap.
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*/
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#define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
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#define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
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#define BITS_PER_CHUNK (sizeof(long) * 8)
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#define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
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struct bitmap_page {
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unsigned long chunks[BITMAP_PAGE_CHUNKS];
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struct bitmap_page *next;
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};
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extern void free_bitmap(struct bitmap_page *bitmap);
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extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
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extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
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extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
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extern int swsusp_shrink_memory(void);
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extern int swsusp_suspend(void);
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extern int swsusp_resume(void);
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