This source file includes following definitions.
- page_address
- _page_hashfn
- find_page
- remove_page_from_hash_queue
- add_page_to_hash_queue
- remove_page_from_inode_queue
- add_page_to_inode_queue
1 #ifndef _LINUX_PAGEMAP_H
2 #define _LINUX_PAGEMAP_H
3
4
5
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8
9
10 static inline unsigned long page_address(struct page * page)
11 {
12 return PAGE_OFFSET + PAGE_SIZE*(page - mem_map);
13 }
14
15 #define PAGE_HASH_SIZE 257
16 #define PAGE_AGE_VALUE 16
17
18 extern unsigned long page_cache_size;
19 extern struct page * page_hash_table[PAGE_HASH_SIZE];
20
21 static inline unsigned long _page_hashfn(struct inode * inode, unsigned long offset)
22 {
23 offset ^= (unsigned long) inode;
24 return offset % PAGE_HASH_SIZE;
25 }
26
27 #define page_hash(inode,offset) page_hash_table[_page_hashfn(inode,offset)]
28
29 static inline struct page * find_page(struct inode * inode, unsigned long offset)
30 {
31 struct page *page;
32
33 for (page = page_hash(inode, offset); page ; page = page->next_hash) {
34 if (page->inode != inode)
35 continue;
36 if (page->offset != offset)
37 continue;
38 page->age = PAGE_AGE_VALUE | (page->age >> 1);
39 break;
40 }
41 return page;
42 }
43
44 static inline void remove_page_from_hash_queue(struct page * page)
45 {
46 struct page **p = &page_hash(page->inode,page->offset);
47
48 page_cache_size--;
49 if (page->next_hash)
50 page->next_hash->prev_hash = page->prev_hash;
51 if (page->prev_hash)
52 page->prev_hash->next_hash = page->next_hash;
53 if (*p == page)
54 *p = page->next_hash;
55 page->next_hash = page->prev_hash = NULL;
56 }
57
58 static inline void add_page_to_hash_queue(struct inode * inode, struct page * page)
59 {
60 struct page **p = &page_hash(inode,page->offset);
61
62 page_cache_size++;
63 page->age = PAGE_AGE_VALUE;
64 page->prev_hash = NULL;
65 if ((page->next_hash = *p) != NULL)
66 page->next_hash->prev_hash = page;
67 *p = page;
68 }
69
70 static inline void remove_page_from_inode_queue(struct page * page)
71 {
72 struct inode * inode = page->inode;
73
74 page->inode = NULL;
75 inode->i_nrpages--;
76 if (inode->i_pages == page)
77 inode->i_pages = page->next;
78 if (page->next)
79 page->next->prev = page->prev;
80 if (page->prev)
81 page->prev->next = page->next;
82 page->next = NULL;
83 page->prev = NULL;
84 }
85
86 static inline void add_page_to_inode_queue(struct inode * inode, struct page * page)
87 {
88 struct page **p = &inode->i_pages;
89
90 inode->i_nrpages++;
91 page->inode = inode;
92 page->prev = NULL;
93 if ((page->next = *p) != NULL)
94 page->next->prev = page;
95 *p = page;
96 }
97
98 #endif