[linux.git] / mm / swap.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _MM_SWAP_H
#define _MM_SWAP_H

#ifdef CONFIG_SWAP
#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_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,
				   bool do_poll,
				   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 */
Commit	Line	Data
014bb1de N	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _MM_SWAP_H
	3	#define _MM_SWAP_H
	4
	5	#ifdef CONFIG_SWAP
	6	#include <linux/blk_types.h> /* for bio_end_io_t */
	7
	8	/* linux/mm/page_io.c */
e1209d3a	9	int sio_pool_init(void);
5169b844	10	struct swap_iocb;
a8c1408f	11	void swap_readpage(struct page page, bool do_poll, struct swap_iocb *plug);
5169b844 N	12	void __swap_read_unplug(struct swap_iocb *plug);
	13	static inline void swap_read_unplug(struct swap_iocb *plug)
	14	{
	15	if (unlikely(plug))
	16	__swap_read_unplug(plug);
	17	}
2282679f	18	void swap_write_unplug(struct swap_iocb *sio);
014bb1de	19	int swap_writepage(struct page page, struct writeback_control wbc);
e3e2762b	20	void __swap_writepage(struct page page, struct writeback_control wbc);
014bb1de N	21
	22	/* linux/mm/swap_state.c */
	23	/* One swap address space for each 64M swap space */
	24	#define SWAP_ADDRESS_SPACE_SHIFT 14
	25	#define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT)
	26	extern struct address_space *swapper_spaces[];
	27	#define swap_address_space(entry) \
	28	(&swapper_spaces[swp_type(entry)][swp_offset(entry) \
	29	>> SWAP_ADDRESS_SPACE_SHIFT])
	30
	31	void show_swap_cache_info(void);
09c02e56	32	bool add_to_swap(struct folio *folio);
014bb1de	33	void *get_shadow_from_swap_cache(swp_entry_t entry);
a4c366f0	34	int add_to_swap_cache(struct folio *folio, swp_entry_t entry,
014bb1de	35	gfp_t gfp, void **shadowp);
ceff9d33	36	void __delete_from_swap_cache(struct folio *folio,
014bb1de	37	swp_entry_t entry, void *shadow);
75fa68a5	38	void delete_from_swap_cache(struct folio *folio);
014bb1de N	39	void clear_shadow_from_swap_cache(int type, unsigned long begin,
014bb1de N	40	unsigned long end);
c9edc242 MWO	41	struct folio *swap_cache_get_folio(swp_entry_t entry,
c9edc242 MWO	42	struct vm_area_struct *vma, unsigned long addr);
524984ff MWO	43	struct folio filemap_get_incore_folio(struct address_space mapping,
524984ff MWO	44	pgoff_t index);
014bb1de N	45
	46	struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
	47	struct vm_area_struct *vma,
	48	unsigned long addr,
5169b844 N	49	bool do_poll,
5169b844 N	50	struct swap_iocb **plug);
014bb1de N	51	struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
	52	struct vm_area_struct *vma,
	53	unsigned long addr,
	54	bool *new_page_allocated);
	55	struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
	56	struct vm_fault *vmf);
	57	struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
	58	struct vm_fault *vmf);
	59
b98c359f	60	static inline unsigned int folio_swap_flags(struct folio *folio)
d791ea67	61	{
b98c359f	62	return page_swap_info(&folio->page)->flags;
d791ea67	63	}
014bb1de	64	#else /* CONFIG_SWAP */
5169b844	65	struct swap_iocb;
a8c1408f CH	66	static inline void swap_readpage(struct page *page, bool do_poll,
a8c1408f CH	67	struct swap_iocb **plug)
014bb1de	68	{
014bb1de	69	}
2282679f N	70	static inline void swap_write_unplug(struct swap_iocb *sio)
	71	{
	72	}
014bb1de N	73
	74	static inline struct address_space *swap_address_space(swp_entry_t entry)
	75	{
	76	return NULL;
	77	}
	78
014bb1de N	79	static inline void show_swap_cache_info(void)
	80	{
	81	}
	82
	83	static inline struct page *swap_cluster_readahead(swp_entry_t entry,
	84	gfp_t gfp_mask, struct vm_fault *vmf)
	85	{
	86	return NULL;
	87	}
	88
	89	static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
	90	struct vm_fault *vmf)
	91	{
	92	return NULL;
	93	}
	94
	95	static inline int swap_writepage(struct page p, struct writeback_control wbc)
	96	{
	97	return 0;
	98	}
	99
c9edc242 MWO	100	static inline struct folio *swap_cache_get_folio(swp_entry_t entry,
	101	struct vm_area_struct *vma, unsigned long addr)
	102	{
	103	return NULL;
	104	}
	105
014bb1de	106	static inline
524984ff MWO	107	struct folio filemap_get_incore_folio(struct address_space mapping,
524984ff MWO	108	pgoff_t index)
014bb1de	109	{
524984ff	110	return filemap_get_folio(mapping, index);
014bb1de N	111	}
014bb1de N	112
09c02e56	113	static inline bool add_to_swap(struct folio *folio)
014bb1de	114	{
09c02e56	115	return false;
014bb1de N	116	}
	117
	118	static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
	119	{
	120	return NULL;
	121	}
	122
a4c366f0	123	static inline int add_to_swap_cache(struct folio *folio, swp_entry_t entry,
014bb1de N	124	gfp_t gfp_mask, void **shadowp)
	125	{
	126	return -1;
	127	}
	128
ceff9d33	129	static inline void __delete_from_swap_cache(struct folio *folio,
014bb1de N	130	swp_entry_t entry, void *shadow)
	131	{
	132	}
	133
75fa68a5	134	static inline void delete_from_swap_cache(struct folio *folio)
014bb1de N	135	{
	136	}
	137
	138	static inline void clear_shadow_from_swap_cache(int type, unsigned long begin,
	139	unsigned long end)
	140	{
	141	}
	142
b98c359f	143	static inline unsigned int folio_swap_flags(struct folio *folio)
d791ea67 N	144	{
	145	return 0;
	146	}
014bb1de N	147	#endif /* CONFIG_SWAP */
014bb1de N	148	#endif /* _MM_SWAP_H */