[linux-block.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;
int 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);
int __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 int swap_readpage(struct page *page, bool do_poll,
				struct swap_iocb **plug)
{
	return 0;
}
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 N	10	struct swap_iocb;
	11	int swap_readpage(struct page *page, bool do_poll,
	12	struct swap_iocb **plug);
	13	void __swap_read_unplug(struct swap_iocb *plug);
	14	static inline void swap_read_unplug(struct swap_iocb *plug)
	15	{
	16	if (unlikely(plug))
	17	__swap_read_unplug(plug);
	18	}
2282679f	19	void swap_write_unplug(struct swap_iocb *sio);
014bb1de	20	int swap_writepage(struct page page, struct writeback_control wbc);
cf1e3fe4	21	int __swap_writepage(struct page page, struct writeback_control wbc);
014bb1de N	22
	23	/* linux/mm/swap_state.c */
	24	/* One swap address space for each 64M swap space */
	25	#define SWAP_ADDRESS_SPACE_SHIFT 14
	26	#define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT)
	27	extern struct address_space *swapper_spaces[];
	28	#define swap_address_space(entry) \
	29	(&swapper_spaces[swp_type(entry)][swp_offset(entry) \
	30	>> SWAP_ADDRESS_SPACE_SHIFT])
	31
	32	void show_swap_cache_info(void);
09c02e56	33	bool add_to_swap(struct folio *folio);
014bb1de	34	void *get_shadow_from_swap_cache(swp_entry_t entry);
a4c366f0	35	int add_to_swap_cache(struct folio *folio, swp_entry_t entry,
014bb1de	36	gfp_t gfp, void **shadowp);
ceff9d33	37	void __delete_from_swap_cache(struct folio *folio,
014bb1de	38	swp_entry_t entry, void *shadow);
75fa68a5	39	void delete_from_swap_cache(struct folio *folio);
014bb1de N	40	void clear_shadow_from_swap_cache(int type, unsigned long begin,
014bb1de N	41	unsigned long end);
c9edc242 MWO	42	struct folio *swap_cache_get_folio(swp_entry_t entry,
c9edc242 MWO	43	struct vm_area_struct *vma, unsigned long addr);
524984ff MWO	44	struct folio filemap_get_incore_folio(struct address_space mapping,
524984ff MWO	45	pgoff_t index);
014bb1de N	46
	47	struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
	48	struct vm_area_struct *vma,
	49	unsigned long addr,
5169b844 N	50	bool do_poll,
5169b844 N	51	struct swap_iocb **plug);
014bb1de N	52	struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
	53	struct vm_area_struct *vma,
	54	unsigned long addr,
	55	bool *new_page_allocated);
	56	struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
	57	struct vm_fault *vmf);
	58	struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
	59	struct vm_fault *vmf);
	60
b98c359f	61	static inline unsigned int folio_swap_flags(struct folio *folio)
d791ea67	62	{
b98c359f	63	return page_swap_info(&folio->page)->flags;
d791ea67	64	}
014bb1de	65	#else /* CONFIG_SWAP */
5169b844 N	66	struct swap_iocb;
	67	static inline int swap_readpage(struct page *page, bool do_poll,
	68	struct swap_iocb **plug)
014bb1de N	69	{
	70	return 0;
	71	}
2282679f N	72	static inline void swap_write_unplug(struct swap_iocb *sio)
	73	{
	74	}
014bb1de N	75
	76	static inline struct address_space *swap_address_space(swp_entry_t entry)
	77	{
	78	return NULL;
	79	}
	80
014bb1de N	81	static inline void show_swap_cache_info(void)
	82	{
	83	}
	84
	85	static inline struct page *swap_cluster_readahead(swp_entry_t entry,
	86	gfp_t gfp_mask, struct vm_fault *vmf)
	87	{
	88	return NULL;
	89	}
	90
	91	static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
	92	struct vm_fault *vmf)
	93	{
	94	return NULL;
	95	}
	96
	97	static inline int swap_writepage(struct page p, struct writeback_control wbc)
	98	{
	99	return 0;
	100	}
	101
c9edc242 MWO	102	static inline struct folio *swap_cache_get_folio(swp_entry_t entry,
	103	struct vm_area_struct *vma, unsigned long addr)
	104	{
	105	return NULL;
	106	}
	107
014bb1de	108	static inline
524984ff MWO	109	struct folio filemap_get_incore_folio(struct address_space mapping,
524984ff MWO	110	pgoff_t index)
014bb1de	111	{
524984ff	112	return filemap_get_folio(mapping, index);
014bb1de N	113	}
014bb1de N	114
09c02e56	115	static inline bool add_to_swap(struct folio *folio)
014bb1de	116	{
09c02e56	117	return false;
014bb1de N	118	}
	119
	120	static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
	121	{
	122	return NULL;
	123	}
	124
a4c366f0	125	static inline int add_to_swap_cache(struct folio *folio, swp_entry_t entry,
014bb1de N	126	gfp_t gfp_mask, void **shadowp)
	127	{
	128	return -1;
	129	}
	130
ceff9d33	131	static inline void __delete_from_swap_cache(struct folio *folio,
014bb1de N	132	swp_entry_t entry, void *shadow)
	133	{
	134	}
	135
75fa68a5	136	static inline void delete_from_swap_cache(struct folio *folio)
014bb1de N	137	{
	138	}
	139
	140	static inline void clear_shadow_from_swap_cache(int type, unsigned long begin,
	141	unsigned long end)
	142	{
	143	}
	144
b98c359f	145	static inline unsigned int folio_swap_flags(struct folio *folio)
d791ea67 N	146	{
	147	return 0;
	148	}
014bb1de N	149	#endif /* CONFIG_SWAP */
014bb1de N	150	#endif /* _MM_SWAP_H */