1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19#ifndef _H_JFS_METAPAGE
20#define _H_JFS_METAPAGE
21
22#include <linux/pagemap.h>
23
24struct metapage {
25
26 u16 xflag;
27 u16 unused;
28 lid_t lid;
29 int lsn;
30 struct list_head synclist;
31
32
33 unsigned long flag;
34 unsigned long count;
35 void *data;
36 sector_t index;
37 wait_queue_head_t wait;
38
39
40 struct page *page;
41 unsigned int logical_size;
42
43
44 int clsn;
45 int nohomeok;
46 struct jfs_log *log;
47};
48
49
50#define META_locked 0
51#define META_dirty 2
52#define META_sync 3
53#define META_discard 4
54#define META_forcewrite 5
55#define META_io 6
56
57#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
58
59
60extern int metapage_init(void);
61extern void metapage_exit(void);
62extern struct metapage *__get_metapage(struct inode *inode,
63 unsigned long lblock, unsigned int size,
64 int absolute, unsigned long new);
65
66#define read_metapage(inode, lblock, size, absolute)\
67 __get_metapage(inode, lblock, size, absolute, false)
68
69#define get_metapage(inode, lblock, size, absolute)\
70 __get_metapage(inode, lblock, size, absolute, true)
71
72extern void release_metapage(struct metapage *);
73extern void grab_metapage(struct metapage *);
74extern void force_metapage(struct metapage *);
75
76
77
78
79
80
81extern void hold_metapage(struct metapage *);
82extern void put_metapage(struct metapage *);
83
84static inline void write_metapage(struct metapage *mp)
85{
86 set_bit(META_dirty, &mp->flag);
87 release_metapage(mp);
88}
89
90static inline void flush_metapage(struct metapage *mp)
91{
92 set_bit(META_sync, &mp->flag);
93 write_metapage(mp);
94}
95
96static inline void discard_metapage(struct metapage *mp)
97{
98 clear_bit(META_dirty, &mp->flag);
99 set_bit(META_discard, &mp->flag);
100 release_metapage(mp);
101}
102
103static inline void metapage_nohomeok(struct metapage *mp)
104{
105 struct page *page = mp->page;
106 lock_page(page);
107 if (!mp->nohomeok++) {
108 mark_metapage_dirty(mp);
109 get_page(page);
110 wait_on_page_writeback(page);
111 }
112 unlock_page(page);
113}
114
115
116
117
118
119static inline void metapage_wait_for_io(struct metapage *mp)
120{
121 if (test_bit(META_io, &mp->flag))
122 wait_on_page_writeback(mp->page);
123}
124
125
126
127
128static inline void _metapage_homeok(struct metapage *mp)
129{
130 if (!--mp->nohomeok)
131 put_page(mp->page);
132}
133
134static inline void metapage_homeok(struct metapage *mp)
135{
136 hold_metapage(mp);
137 _metapage_homeok(mp);
138 put_metapage(mp);
139}
140
141extern const struct address_space_operations jfs_metapage_aops;
142
143
144
145
146extern void __invalidate_metapages(struct inode *, s64, int);
147#define invalidate_pxd_metapages(ip, pxd) \
148 __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd)))
149#define invalidate_dxd_metapages(ip, dxd) \
150 __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd)))
151#define invalidate_xad_metapages(ip, xad) \
152 __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad)))
153
154#endif
155