diff options
Diffstat (limited to 'mm/swap.h')
| -rw-r--r-- | mm/swap.h | 74 |
1 files changed, 65 insertions, 9 deletions
diff --git a/mm/swap.h b/mm/swap.h index fc2f6ade7f80..ad2f121de970 100644 --- a/mm/swap.h +++ b/mm/swap.h @@ -5,13 +5,13 @@ struct mempolicy; #ifdef CONFIG_SWAP +#include <linux/swapops.h> /* for swp_offset */ #include <linux/blk_types.h> /* for bio_end_io_t */ /* linux/mm/page_io.c */ int sio_pool_init(void); struct swap_iocb; -void swap_read_folio(struct folio *folio, bool do_poll, - struct swap_iocb **plug); +void swap_read_folio(struct folio *folio, struct swap_iocb **plug); void __swap_read_unplug(struct swap_iocb *plug); static inline void swap_read_unplug(struct swap_iocb *plug) { @@ -26,11 +26,29 @@ void __swap_writepage(struct folio *folio, struct writeback_control *wbc); /* One swap address space for each 64M swap space */ #define SWAP_ADDRESS_SPACE_SHIFT 14 #define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT) +#define SWAP_ADDRESS_SPACE_MASK (SWAP_ADDRESS_SPACE_PAGES - 1) extern struct address_space *swapper_spaces[]; #define swap_address_space(entry) \ (&swapper_spaces[swp_type(entry)][swp_offset(entry) \ >> SWAP_ADDRESS_SPACE_SHIFT]) +/* + * Return the swap device position of the swap entry. + */ +static inline loff_t swap_dev_pos(swp_entry_t entry) +{ + return ((loff_t)swp_offset(entry)) << PAGE_SHIFT; +} + +/* + * Return the swap cache index of the swap entry. + */ +static inline pgoff_t swap_cache_index(swp_entry_t entry) +{ + BUILD_BUG_ON((SWP_OFFSET_MASK | SWAP_ADDRESS_SPACE_MASK) != SWP_OFFSET_MASK); + return swp_offset(entry) & SWAP_ADDRESS_SPACE_MASK; +} + void show_swap_cache_info(void); bool add_to_swap(struct folio *folio); void *get_shadow_from_swap_cache(swp_entry_t entry); @@ -41,7 +59,7 @@ void __delete_from_swap_cache(struct folio *folio, void delete_from_swap_cache(struct folio *folio); void clear_shadow_from_swap_cache(int type, unsigned long begin, unsigned long end); -void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry); +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, @@ -55,17 +73,42 @@ struct folio *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_flags, bool skip_if_exists); struct folio *swap_cluster_readahead(swp_entry_t entry, gfp_t flag, struct mempolicy *mpol, pgoff_t ilx); -struct page *swapin_readahead(swp_entry_t entry, gfp_t flag, - struct vm_fault *vmf); +struct folio *swapin_readahead(swp_entry_t entry, gfp_t flag, + struct vm_fault *vmf); static inline unsigned int folio_swap_flags(struct folio *folio) { return swp_swap_info(folio->swap)->flags; } + +/* + * Return the count of contiguous swap entries that share the same + * zeromap status as the starting entry. If is_zeromap is not NULL, + * it will return the zeromap status of the starting entry. + */ +static inline int swap_zeromap_batch(swp_entry_t entry, int max_nr, + bool *is_zeromap) +{ + struct swap_info_struct *sis = swp_swap_info(entry); + unsigned long start = swp_offset(entry); + unsigned long end = start + max_nr; + bool first_bit; + + first_bit = test_bit(start, sis->zeromap); + if (is_zeromap) + *is_zeromap = first_bit; + + if (max_nr <= 1) + return max_nr; + if (first_bit) + return find_next_zero_bit(sis->zeromap, end, start) - start; + else + return find_next_bit(sis->zeromap, end, start) - start; +} + #else /* CONFIG_SWAP */ struct swap_iocb; -static inline void swap_read_folio(struct folio *folio, bool do_poll, - struct swap_iocb **plug) +static inline void swap_read_folio(struct folio *folio, struct swap_iocb **plug) { } static inline void swap_write_unplug(struct swap_iocb *sio) @@ -77,6 +120,11 @@ static inline struct address_space *swap_address_space(swp_entry_t entry) return NULL; } +static inline pgoff_t swap_cache_index(swp_entry_t entry) +{ + return 0; +} + static inline void show_swap_cache_info(void) { } @@ -87,7 +135,7 @@ static inline struct folio *swap_cluster_readahead(swp_entry_t entry, return NULL; } -static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask, +static inline struct folio *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask, struct vm_fault *vmf) { return NULL; @@ -98,7 +146,7 @@ static inline int swap_writepage(struct page *p, struct writeback_control *wbc) return 0; } -static inline void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry) +static inline void swapcache_clear(struct swap_info_struct *si, swp_entry_t entry, int nr) { } @@ -149,5 +197,13 @@ static inline unsigned int folio_swap_flags(struct folio *folio) { return 0; } + +static inline int swap_zeromap_batch(swp_entry_t entry, int max_nr, + bool *has_zeromap) +{ + return 0; +} + #endif /* CONFIG_SWAP */ + #endif /* _MM_SWAP_H */ |