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authorRafael J. Wysocki <rjw@sisk.pl>2006-03-23 05:59:59 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 10:38:07 -0500
commitf577eb30afdc68233f25d4d82b04102129262365 (patch)
tree25d3c2fa8dfbf42fd0d4776a36166736fcc1446a /include/linux/swap.h
parent2b322ce210aec74ae0d02938d3a01e29fe079469 (diff)
[PATCH] swsusp: low level interface
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>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 12415dd94451..54eac8a39a4c 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -234,14 +234,15 @@ extern struct page * read_swap_cache_async(swp_entry_t, struct vm_area_struct *v
234/* linux/mm/swapfile.c */ 234/* linux/mm/swapfile.c */
235extern long total_swap_pages; 235extern long total_swap_pages;
236extern unsigned int nr_swapfiles; 236extern unsigned int nr_swapfiles;
237extern struct swap_info_struct swap_info[];
238extern void si_swapinfo(struct sysinfo *); 237extern void si_swapinfo(struct sysinfo *);
239extern swp_entry_t get_swap_page(void); 238extern swp_entry_t get_swap_page(void);
240extern swp_entry_t get_swap_page_of_type(int type); 239extern swp_entry_t get_swap_page_of_type(int);
241extern int swap_duplicate(swp_entry_t); 240extern int swap_duplicate(swp_entry_t);
242extern int valid_swaphandles(swp_entry_t, unsigned long *); 241extern int valid_swaphandles(swp_entry_t, unsigned long *);
243extern void swap_free(swp_entry_t); 242extern void swap_free(swp_entry_t);
244extern void free_swap_and_cache(swp_entry_t); 243extern void free_swap_and_cache(swp_entry_t);
244extern int swap_type_of(dev_t);
245extern unsigned int count_swap_pages(int, int);
245extern sector_t map_swap_page(struct swap_info_struct *, pgoff_t); 246extern sector_t map_swap_page(struct swap_info_struct *, pgoff_t);
246extern struct swap_info_struct *get_swap_info_struct(unsigned); 247extern struct swap_info_struct *get_swap_info_struct(unsigned);
247extern int can_share_swap_page(struct page *); 248extern int can_share_swap_page(struct page *);