f577eb30af
Introduce the low level interface that can be used for handling the snapshot of the system memory by the in-kernel swap-writing/reading code of swsusp and the userland interface code (to be introduced shortly). Also change the way in which swsusp records the allocated swap pages and, consequently, simplifies the in-kernel swap-writing/reading code (this is necessary for the userland interface too). To this end, it introduces two helper functions in mm/swapfile.c, so that the swsusp code does not refer directly to the swap internals. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
68 lines
1.5 KiB
C
68 lines
1.5 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 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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