151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MM_SWAP_H
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#define _MM_SWAP_H
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#ifdef CONFIG_SWAP
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#include <linux/blk_types.h> /* for bio_end_io_t */
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/* linux/mm/page_io.c */
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int sio_pool_init(void);
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struct swap_iocb;
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int swap_readpage(struct page *page, bool do_poll,
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struct swap_iocb **plug);
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void __swap_read_unplug(struct swap_iocb *plug);
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static inline void swap_read_unplug(struct swap_iocb *plug)
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{
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if (unlikely(plug))
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__swap_read_unplug(plug);
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}
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void swap_write_unplug(struct swap_iocb *sio);
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int swap_writepage(struct page *page, struct writeback_control *wbc);
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int __swap_writepage(struct page *page, struct writeback_control *wbc);
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/* linux/mm/swap_state.c */
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/* One swap address space for each 64M swap space */
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#define SWAP_ADDRESS_SPACE_SHIFT 14
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#define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT)
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extern struct address_space *swapper_spaces[];
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#define swap_address_space(entry) \
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(&swapper_spaces[swp_type(entry)][swp_offset(entry) \
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>> SWAP_ADDRESS_SPACE_SHIFT])
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void show_swap_cache_info(void);
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bool add_to_swap(struct folio *folio);
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void *get_shadow_from_swap_cache(swp_entry_t entry);
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int add_to_swap_cache(struct page *page, swp_entry_t entry,
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gfp_t gfp, void **shadowp);
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void __delete_from_swap_cache(struct folio *folio,
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swp_entry_t entry, void *shadow);
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void delete_from_swap_cache(struct folio *folio);
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void clear_shadow_from_swap_cache(int type, unsigned long begin,
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unsigned long end);
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struct page *lookup_swap_cache(swp_entry_t entry,
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struct vm_area_struct *vma,
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unsigned long addr);
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struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index);
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struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
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struct vm_area_struct *vma,
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unsigned long addr,
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bool do_poll,
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struct swap_iocb **plug);
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struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
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struct vm_area_struct *vma,
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unsigned long addr,
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bool *new_page_allocated);
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struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
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struct vm_fault *vmf);
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struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
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struct vm_fault *vmf);
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static inline unsigned int folio_swap_flags(struct folio *folio)
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{
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return page_swap_info(&folio->page)->flags;
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}
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#else /* CONFIG_SWAP */
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struct swap_iocb;
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static inline int swap_readpage(struct page *page, bool do_poll,
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struct swap_iocb **plug)
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{
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return 0;
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}
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static inline void swap_write_unplug(struct swap_iocb *sio)
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{
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}
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static inline struct address_space *swap_address_space(swp_entry_t entry)
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{
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return NULL;
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}
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static inline void show_swap_cache_info(void)
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{
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}
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static inline struct page *swap_cluster_readahead(swp_entry_t entry,
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gfp_t gfp_mask, struct vm_fault *vmf)
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{
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return NULL;
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}
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static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
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struct vm_fault *vmf)
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{
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return NULL;
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}
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static inline int swap_writepage(struct page *p, struct writeback_control *wbc)
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{
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return 0;
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}
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static inline struct page *lookup_swap_cache(swp_entry_t swp,
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struct vm_area_struct *vma,
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unsigned long addr)
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{
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return NULL;
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}
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static inline
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struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
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{
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return find_get_page(mapping, index);
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}
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static inline bool add_to_swap(struct folio *folio)
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{
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return false;
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}
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static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
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{
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return NULL;
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}
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static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
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gfp_t gfp_mask, void **shadowp)
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{
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return -1;
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}
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static inline void __delete_from_swap_cache(struct folio *folio,
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swp_entry_t entry, void *shadow)
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{
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}
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static inline void delete_from_swap_cache(struct folio *folio)
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{
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}
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static inline void clear_shadow_from_swap_cache(int type, unsigned long begin,
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unsigned long end)
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{
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}
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static inline unsigned int folio_swap_flags(struct folio *folio)
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{
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return 0;
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}
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#endif /* CONFIG_SWAP */
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#endif /* _MM_SWAP_H */
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