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
17 extern struct page * page_hash_table[PAGE_HASH_SIZE];
18
19 static inline unsigned long _page_hashfn(struct inode * inode, unsigned long offset)
20 {
21 offset ^= (unsigned long) inode;
22 return offset % PAGE_HASH_SIZE;
23 }
24
25 #define page_hash(inode,offset) page_hash_table[_page_hashfn(inode,offset)]
26
27 static inline struct page * find_page(struct inode * inode, unsigned long offset)
28 {
29 struct page *page;
30
31 for (page = page_hash(inode, offset); page ; page = page->next_hash) {
32 if (page->inode != inode)
33 continue;
34 if (page->offset != offset)
35 continue;
36 break;
37 }
38 return page;
39 }
40
41 static inline void remove_page_from_hash_queue(struct page * page)
42 {
43 struct page **p = &page_hash(page->inode,page->offset);
44
45 if (page->next_hash)
46 page->next_hash->prev_hash = page->prev_hash;
47 if (page->prev_hash)
48 page->prev_hash->next_hash = page->next_hash;
49 if (*p == page)
50 *p = page->next_hash;
51 page->next_hash = page->prev_hash = NULL;
52 }
53
54 static inline void add_page_to_hash_queue(struct inode * inode, struct page * page)
55 {
56 struct page **p = &page_hash(inode,page->offset);
57
58 page->prev_hash = NULL;
59 if ((page->next_hash = *p) != NULL)
60 page->next_hash->prev_hash = page;
61 *p = page;
62 }
63
64 static inline void remove_page_from_inode_queue(struct page * page)
65 {
66 struct inode * inode = page->inode;
67
68 page->inode = NULL;
69 inode->i_nrpages--;
70 if (inode->i_pages == page)
71 inode->i_pages = page->next;
72 if (page->next)
73 page->next->prev = page->prev;
74 if (page->prev)
75 page->prev->next = page->next;
76 page->next = NULL;
77 page->prev = NULL;
78 }
79
80 static inline void add_page_to_inode_queue(struct inode * inode, struct page * page)
81 {
82 struct page **p = &inode->i_pages;
83
84 inode->i_nrpages++;
85 page->inode = inode;
86 page->prev = NULL;
87 if ((page->next = *p) != NULL)
88 page->next->prev = page;
89 *p = page;
90 }
91
92 #endif