diff options
| -rw-r--r-- | mm/mincore.c | 29 | ||||
| -rw-r--r-- | mm/swap.h | 10 | ||||
| -rw-r--r-- | mm/swap_state.c | 38 |
3 files changed, 27 insertions, 50 deletions
diff --git a/mm/mincore.c b/mm/mincore.c index 10dabefc3acc..20fd0967d3cb 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -64,8 +64,33 @@ static unsigned char mincore_page(struct address_space *mapping, pgoff_t index) * any other file mapping (ie. marked !present and faulted in with * tmpfs's .fault). So swapped out tmpfs mappings are tested here. */ - folio = filemap_get_incore_folio(mapping, index); - if (!IS_ERR(folio)) { + if (IS_ENABLED(CONFIG_SWAP) && shmem_mapping(mapping)) { + folio = filemap_get_entry(mapping, index); + /* + * shmem/tmpfs may return swap: account for swapcache + * page too. + */ + if (xa_is_value(folio)) { + struct swap_info_struct *si; + swp_entry_t swp = radix_to_swp_entry(folio); + /* There might be swapin error entries in shmem mapping. */ + if (non_swap_entry(swp)) + return 0; + /* Prevent swap device to being swapoff under us */ + si = get_swap_device(swp); + if (si) { + folio = filemap_get_folio(swap_address_space(swp), + swap_cache_index(swp)); + put_swap_device(si); + } else { + return 0; + } + } + } else { + folio = filemap_get_folio(mapping, index); + } + + if (!IS_ERR_OR_NULL(folio)) { present = folio_test_uptodate(folio); folio_put(folio); } diff --git a/mm/swap.h b/mm/swap.h index 911ad5ff0f89..1ae44d4193b1 100644 --- a/mm/swap.h +++ b/mm/swap.h @@ -64,9 +64,6 @@ void clear_shadow_from_swap_cache(int type, unsigned long begin, void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int nr); struct folio *swap_cache_get_folio(swp_entry_t entry, struct vm_area_struct *vma, unsigned long addr); -struct folio *filemap_get_incore_folio(struct address_space *mapping, - pgoff_t index); - struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, struct vm_area_struct *vma, unsigned long addr, struct swap_iocb **plug); @@ -178,13 +175,6 @@ static inline struct folio *swap_cache_get_folio(swp_entry_t entry, return NULL; } -static inline -struct folio *filemap_get_incore_folio(struct address_space *mapping, - pgoff_t index) -{ - return filemap_get_folio(mapping, index); -} - static inline void *get_shadow_from_swap_cache(swp_entry_t entry) { return NULL; diff --git a/mm/swap_state.c b/mm/swap_state.c index c354435a0923..99513b74b5d8 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -323,44 +323,6 @@ struct folio *swap_cache_get_folio(swp_entry_t entry, return folio; } -/** - * filemap_get_incore_folio - Find and get a folio from the page or swap caches. - * @mapping: The address_space to search. - * @index: The page cache index. - * - * This differs from filemap_get_folio() in that it will also look for the - * folio in the swap cache. - * - * Return: The found folio or %NULL. - */ -struct folio *filemap_get_incore_folio(struct address_space *mapping, - pgoff_t index) -{ - swp_entry_t swp; - struct swap_info_struct *si; - struct folio *folio = filemap_get_entry(mapping, index); - - if (!folio) - return ERR_PTR(-ENOENT); - if (!xa_is_value(folio)) - return folio; - if (!shmem_mapping(mapping)) - return ERR_PTR(-ENOENT); - - swp = radix_to_swp_entry(folio); - /* There might be swapin error entries in shmem mapping. */ - if (non_swap_entry(swp)) - return ERR_PTR(-ENOENT); - /* Prevent swapoff from happening to us */ - si = get_swap_device(swp); - if (!si) - return ERR_PTR(-ENOENT); - index = swap_cache_index(swp); - folio = filemap_get_folio(swap_address_space(swp), index); - put_swap_device(si); - return folio; -} - struct folio *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, struct mempolicy *mpol, pgoff_t ilx, bool *new_page_allocated, bool skip_if_exists) |