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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | #ifndef _LINUX_PAGEMAP_H
#define _LINUX_PAGEMAP_H
/*
* Copyright 1995 Linus Torvalds
*/
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/highmem.h>
/*
* The page cache can done in larger chunks than
* one page, because it allows for more efficient
* throughput (it can then be mapped into user
* space in smaller chunks for same flexibility).
*
* Or rather, it _will_ be done in larger chunks.
*/
#define PAGE_CACHE_SHIFT PAGE_SHIFT
#define PAGE_CACHE_SIZE PAGE_SIZE
#define PAGE_CACHE_MASK PAGE_MASK
#define PAGE_CACHE_ALIGN(addr) (((addr)+PAGE_CACHE_SIZE-1)&PAGE_CACHE_MASK)
#define page_cache_get(page) get_page(page)
#define page_cache_release(page) put_page(page)
void release_pages(struct page **pages, int nr, int cold);
static inline struct page *page_cache_alloc(struct address_space *x)
{
return alloc_pages(x->gfp_mask, 0);
}
static inline struct page *page_cache_alloc_cold(struct address_space *x)
{
return alloc_pages(x->gfp_mask|__GFP_COLD, 0);
}
typedef int filler_t(void *, struct page *);
extern struct page * find_get_page(struct address_space *mapping,
unsigned long index);
extern struct page * find_lock_page(struct address_space *mapping,
unsigned long index);
extern struct page * find_trylock_page(struct address_space *mapping,
unsigned long index);
extern struct page * find_or_create_page(struct address_space *mapping,
unsigned long index, unsigned int gfp_mask);
extern unsigned int find_get_pages(struct address_space *mapping,
pgoff_t start, unsigned int nr_pages,
struct page **pages);
/*
* Returns locked page at given index in given cache, creating it if needed.
*/
static inline struct page *grab_cache_page(struct address_space *mapping, unsigned long index)
{
return find_or_create_page(mapping, index, mapping->gfp_mask);
}
extern struct page * grab_cache_page_nowait(struct address_space *mapping,
unsigned long index);
extern struct page * read_cache_page(struct address_space *mapping,
unsigned long index, filler_t *filler,
void *data);
extern int read_cache_pages(struct address_space *mapping,
struct list_head *pages, filler_t *filler, void *data);
int add_to_page_cache(struct page *page, struct address_space *mapping,
unsigned long index, int gfp_mask);
int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
unsigned long index, int gfp_mask);
extern void remove_from_page_cache(struct page *page);
extern void __remove_from_page_cache(struct page *page);
static inline void ___add_to_page_cache(struct page *page,
struct address_space *mapping, unsigned long index)
{
list_add(&page->list, &mapping->clean_pages);
page->mapping = mapping;
page->index = index;
mapping->nrpages++;
inc_page_state(nr_pagecache);
}
extern void FASTCALL(__lock_page(struct page *page));
extern void FASTCALL(unlock_page(struct page *page));
static inline void lock_page(struct page *page)
{
if (TestSetPageLocked(page))
__lock_page(page);
}
/*
* This is exported only for wait_on_page_locked/wait_on_page_writeback.
* Never use this directly!
*/
extern void FASTCALL(wait_on_page_bit(struct page *page, int bit_nr));
/*
* Wait for a page to be unlocked.
*
* This must be called with the caller "holding" the page,
* ie with increased "page->count" so that the page won't
* go away during the wait..
*/
static inline void wait_on_page_locked(struct page *page)
{
if (PageLocked(page))
wait_on_page_bit(page, PG_locked);
}
/*
* Wait for a page to complete writeback
*/
static inline void wait_on_page_writeback(struct page *page)
{
if (PageWriteback(page))
wait_on_page_bit(page, PG_writeback);
}
extern void end_page_writeback(struct page *page);
#endif /* _LINUX_PAGEMAP_H */
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