[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;
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 page *find_get_incore_page(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 page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
{
	return find_get_page(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);
014bb1de N	44	struct page find_get_incore_page(struct address_space mapping, pgoff_t index);
	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 N	65	struct swap_iocb;
	66	static inline int swap_readpage(struct page *page, bool do_poll,
	67	struct swap_iocb **plug)
014bb1de N	68	{
	69	return 0;
	70	}
2282679f N	71	static inline void swap_write_unplug(struct swap_iocb *sio)
	72	{
	73	}
014bb1de N	74
	75	static inline struct address_space *swap_address_space(swp_entry_t entry)
	76	{
	77	return NULL;
	78	}
	79
014bb1de N	80	static inline void show_swap_cache_info(void)
	81	{
	82	}
	83
	84	static inline struct page *swap_cluster_readahead(swp_entry_t entry,
	85	gfp_t gfp_mask, struct vm_fault *vmf)
	86	{
	87	return NULL;
	88	}
	89
	90	static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
	91	struct vm_fault *vmf)
	92	{
	93	return NULL;
	94	}
	95
	96	static inline int swap_writepage(struct page p, struct writeback_control wbc)
	97	{
	98	return 0;
	99	}
	100
c9edc242 MWO	101	static inline struct folio *swap_cache_get_folio(swp_entry_t entry,
	102	struct vm_area_struct *vma, unsigned long addr)
	103	{
	104	return NULL;
	105	}
	106
014bb1de N	107	static inline
	108	struct page find_get_incore_page(struct address_space mapping, pgoff_t index)
	109	{
	110	return find_get_page(mapping, index);
	111	}
	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 */