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tmpfs: move swap swizzling into shmem

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move_to_swap_cache and move_from_swap_cache functions (which swizzle a page
between tmpfs page cache and swap cache, to avoid page copying) are only used
by shmem.c; and our subsequent fix for unionfs needs different treatments in
the two instances of move_from_swap_cache.  Move them from swap_state.c into
their callsites shmem_writepage, shmem_unuse_inode and shmem_getpage, making
add_to_swap_cache externally visible.

shmem.c likes to say set_page_dirty where swap_state.c liked to say
SetPageDirty: respect that diversity, which __set_page_dirty_no_writeback
makes moot (and implies we should lose that "shift page from clean_pages to
dirty_pages list" comment: it's on neither).

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins
2008-02-04 22:28:50 -08:00
committed by Linus Torvalds
parent f000944d03
commit 73b1262fa4
3 changed files with 17 additions and 49 deletions
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15
include/linux/swap.h
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@@ -220,11 +220,9 @@ 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 *, gfp_t);
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 int move_to_swap_cache(struct page *, swp_entry_t);
extern int move_from_swap_cache(struct page *, unsigned long,
struct address_space *);
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);
@@ -319,15 +317,10 @@ static inline struct page *lookup_swap_cache(swp_entry_t swp)
#define can_share_swap_page(p) (page_mapcount(p) == 1)
static inline int move_to_swap_cache(struct page *page, swp_entry_t entry)
static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
gfp_t gfp_mask)
{
return 1;
}
static inline int move_from_swap_cache(struct page *page, unsigned long index,
struct address_space *mapping)
{
return 1;
return -1;
}
static inline void __delete_from_swap_cache(struct page *page)