[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,
				   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	49	struct swap_iocb **plug);
014bb1de N	50	struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
	51	struct vm_area_struct *vma,
	52	unsigned long addr,
	53	bool *new_page_allocated);
	54	struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
	55	struct vm_fault *vmf);
	56	struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
	57	struct vm_fault *vmf);
	58
b98c359f	59	static inline unsigned int folio_swap_flags(struct folio *folio)
d791ea67	60	{
b98c359f	61	return page_swap_info(&folio->page)->flags;
d791ea67	62	}
014bb1de	63	#else /* CONFIG_SWAP */
5169b844	64	struct swap_iocb;
a8c1408f CH	65	static inline void swap_readpage(struct page *page, bool do_poll,
a8c1408f CH	66	struct swap_iocb **plug)
014bb1de	67	{
014bb1de	68	}
2282679f N	69	static inline void swap_write_unplug(struct swap_iocb *sio)
	70	{
	71	}
014bb1de N	72
	73	static inline struct address_space *swap_address_space(swp_entry_t entry)
	74	{
	75	return NULL;
	76	}
	77
014bb1de N	78	static inline void show_swap_cache_info(void)
	79	{
	80	}
	81
	82	static inline struct page *swap_cluster_readahead(swp_entry_t entry,
	83	gfp_t gfp_mask, struct vm_fault *vmf)
	84	{
	85	return NULL;
	86	}
	87
	88	static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
	89	struct vm_fault *vmf)
	90	{
	91	return NULL;
	92	}
	93
	94	static inline int swap_writepage(struct page p, struct writeback_control wbc)
	95	{
	96	return 0;
	97	}
	98
c9edc242 MWO	99	static inline struct folio *swap_cache_get_folio(swp_entry_t entry,
	100	struct vm_area_struct *vma, unsigned long addr)
	101	{
	102	return NULL;
	103	}
	104
014bb1de	105	static inline
524984ff MWO	106	struct folio filemap_get_incore_folio(struct address_space mapping,
524984ff MWO	107	pgoff_t index)
014bb1de	108	{
524984ff	109	return filemap_get_folio(mapping, index);
014bb1de N	110	}
014bb1de N	111
09c02e56	112	static inline bool add_to_swap(struct folio *folio)
014bb1de	113	{
09c02e56	114	return false;
014bb1de N	115	}
	116
	117	static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
	118	{
	119	return NULL;
	120	}
	121
a4c366f0	122	static inline int add_to_swap_cache(struct folio *folio, swp_entry_t entry,
014bb1de N	123	gfp_t gfp_mask, void **shadowp)
	124	{
	125	return -1;
	126	}
	127
ceff9d33	128	static inline void __delete_from_swap_cache(struct folio *folio,
014bb1de N	129	swp_entry_t entry, void *shadow)
	130	{
	131	}
	132
75fa68a5	133	static inline void delete_from_swap_cache(struct folio *folio)
014bb1de N	134	{
	135	}
	136
	137	static inline void clear_shadow_from_swap_cache(int type, unsigned long begin,
	138	unsigned long end)
	139	{
	140	}
	141
b98c359f	142	static inline unsigned int folio_swap_flags(struct folio *folio)
d791ea67 N	143	{
	144	return 0;
	145	}
014bb1de N	146	#endif /* CONFIG_SWAP */
014bb1de N	147	#endif /* _MM_SWAP_H */