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| author | Hugh Dickins <hugh@veritas.com> | 2008-02-04 22:28:50 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 09:44:15 -0800 |
| commit | 73b1262fa43a778b1e154deea632cdef5009d6a1 (patch) | |
| tree | 409f14e78e23cd999e8c3d1e0945f0fa9b67048f /include/linux/swap.h | |
| parent | f000944d03a5b74ab3c92b2fcdf0e944cc898065 (diff) | |
| download | lwn-73b1262fa43a778b1e154deea632cdef5009d6a1.tar.gz lwn-73b1262fa43a778b1e154deea632cdef5009d6a1.zip | |
tmpfs: move swap swizzling into shmem
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>
Diffstat (limited to 'include/linux/swap.h')
| -rw-r--r-- | include/linux/swap.h | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h index 16fd1209e9fa..353153ea0bd5 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -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) |