mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 08:02:07 +00:00
524984ff66
Return the containing folio instead of the precise page. One of the callers wants the folio and the other can do the folio->page conversion itself. Nets 442 bytes of text size reduction, 478 bytes removed and 36 bytes added. Link: https://lkml.kernel.org/r/20221019183332.2802139-4-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/* 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 */
|