diff options
Diffstat (limited to 'mm/swap_state.c')
| -rw-r--r-- | mm/swap_state.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c index c16eebb81d8b..c79e2242dd04 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -21,6 +21,7 @@ #include <linux/vmalloc.h> #include <linux/swap_slots.h> #include <linux/huge_mm.h> +#include <linux/shmem_fs.h> #include "internal.h" /* @@ -414,6 +415,37 @@ struct page *lookup_swap_cache(swp_entry_t entry, struct vm_area_struct *vma, return page; } +/** + * find_get_incore_page - Find and get a page from the page or swap caches. + * @mapping: The address_space to search. + * @index: The page cache index. + * + * This differs from find_get_page() in that it will also look for the + * page in the swap cache. + * + * Return: The found page or %NULL. + */ +struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index) +{ + swp_entry_t swp; + struct swap_info_struct *si; + struct page *page = find_get_entry(mapping, index); + + if (!xa_is_value(page)) + return page; + if (!shmem_mapping(mapping)) + return NULL; + + swp = radix_to_swp_entry(page); + /* Prevent swapoff from happening to us */ + si = get_swap_device(swp); + if (!si) + return NULL; + page = find_get_page(swap_address_space(swp), swp_offset(swp)); + put_swap_device(si); + return page; +} + struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr, bool *new_page_allocated) |