From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- mm/swap.h | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 mm/swap.h (limited to 'mm/swap.h') diff --git a/mm/swap.h b/mm/swap.h new file mode 100644 index 000000000..8a3c7a0ac --- /dev/null +++ b/mm/swap.h @@ -0,0 +1,147 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _MM_SWAP_H +#define _MM_SWAP_H + +#ifdef CONFIG_SWAP +#include /* for bio_end_io_t */ + +/* linux/mm/page_io.c */ +int sio_pool_init(void); +struct swap_iocb; +void swap_readpage(struct page *page, bool do_poll, struct swap_iocb **plug); +void __swap_read_unplug(struct swap_iocb *plug); +static inline void swap_read_unplug(struct swap_iocb *plug) +{ + if (unlikely(plug)) + __swap_read_unplug(plug); +} +void swap_write_unplug(struct swap_iocb *sio); +int swap_writepage(struct page *page, struct writeback_control *wbc); +void __swap_writepage(struct page *page, struct writeback_control *wbc); + +/* linux/mm/swap_state.c */ +/* 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) +extern struct address_space *swapper_spaces[]; +#define swap_address_space(entry) \ + (&swapper_spaces[swp_type(entry)][swp_offset(entry) \ + >> SWAP_ADDRESS_SPACE_SHIFT]) + +void show_swap_cache_info(void); +bool add_to_swap(struct folio *folio); +void *get_shadow_from_swap_cache(swp_entry_t entry); +int add_to_swap_cache(struct folio *folio, swp_entry_t entry, + gfp_t gfp, void **shadowp); +void __delete_from_swap_cache(struct folio *folio, + swp_entry_t entry, void *shadow); +void delete_from_swap_cache(struct folio *folio); +void clear_shadow_from_swap_cache(int type, unsigned long begin, + unsigned long end); +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 page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, + struct vm_area_struct *vma, + unsigned long addr, + struct swap_iocb **plug); +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); +struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag, + struct vm_fault *vmf); +struct page *swapin_readahead(swp_entry_t entry, gfp_t flag, + struct vm_fault *vmf); + +static inline unsigned int folio_swap_flags(struct folio *folio) +{ + return page_swap_info(&folio->page)->flags; +} +#else /* CONFIG_SWAP */ +struct swap_iocb; +static inline void swap_readpage(struct page *page, bool do_poll, + struct swap_iocb **plug) +{ +} +static inline void swap_write_unplug(struct swap_iocb *sio) +{ +} + +static inline struct address_space *swap_address_space(swp_entry_t entry) +{ + return NULL; +} + +static inline void show_swap_cache_info(void) +{ +} + +static inline struct page *swap_cluster_readahead(swp_entry_t entry, + gfp_t gfp_mask, struct vm_fault *vmf) +{ + return NULL; +} + +static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask, + struct vm_fault *vmf) +{ + return NULL; +} + +static inline int swap_writepage(struct page *p, struct writeback_control *wbc) +{ + return 0; +} + +static inline struct folio *swap_cache_get_folio(swp_entry_t entry, + struct vm_area_struct *vma, unsigned long addr) +{ + 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 bool add_to_swap(struct folio *folio) +{ + return false; +} + +static inline void *get_shadow_from_swap_cache(swp_entry_t entry) +{ + return NULL; +} + +static inline int add_to_swap_cache(struct folio *folio, swp_entry_t entry, + gfp_t gfp_mask, void **shadowp) +{ + return -1; +} + +static inline void __delete_from_swap_cache(struct folio *folio, + swp_entry_t entry, void *shadow) +{ +} + +static inline void delete_from_swap_cache(struct folio *folio) +{ +} + +static inline void clear_shadow_from_swap_cache(int type, unsigned long begin, + unsigned long end) +{ +} + +static inline unsigned int folio_swap_flags(struct folio *folio) +{ + return 0; +} +#endif /* CONFIG_SWAP */ +#endif /* _MM_SWAP_H */ -- cgit v1.2.3