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1da177e4 LT |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2000-2002 | |
3 | * Portions Copyright (c) Christoph Hellwig, 2001-2002 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | #ifndef _H_JFS_METAPAGE | |
20 | #define _H_JFS_METAPAGE | |
21 | ||
22 | #include <linux/pagemap.h> | |
23 | ||
24 | struct metapage { | |
25 | /* Common logsyncblk prefix (see jfs_logmgr.h) */ | |
26 | u16 xflag; | |
27 | u16 unused; | |
28 | lid_t lid; | |
29 | int lsn; | |
30 | struct list_head synclist; | |
31 | /* End of logsyncblk prefix */ | |
32 | ||
33 | unsigned long flag; /* See Below */ | |
34 | unsigned long count; /* Reference count */ | |
35 | void *data; /* Data pointer */ | |
36 | ||
37 | /* list management stuff */ | |
38 | struct metapage *hash_prev; | |
39 | struct metapage *hash_next; /* Also used for free list */ | |
40 | ||
41 | /* | |
42 | * mapping & index become redundant, but we need these here to | |
43 | * add the metapage to the hash before we have the real page | |
44 | */ | |
45 | struct address_space *mapping; | |
46 | unsigned long index; | |
47 | wait_queue_head_t wait; | |
48 | ||
49 | /* implementation */ | |
50 | struct page *page; | |
51 | unsigned long logical_size; | |
52 | ||
53 | /* Journal management */ | |
54 | int clsn; | |
55 | atomic_t nohomeok; | |
56 | struct jfs_log *log; | |
57 | }; | |
58 | ||
59 | /* metapage flag */ | |
60 | #define META_locked 0 | |
61 | #define META_absolute 1 | |
62 | #define META_free 2 | |
63 | #define META_dirty 3 | |
64 | #define META_sync 4 | |
65 | #define META_discard 5 | |
66 | #define META_forced 6 | |
67 | #define META_stale 7 | |
68 | ||
69 | #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) | |
70 | ||
71 | /* function prototypes */ | |
72 | extern struct metapage *__get_metapage(struct inode *inode, | |
73 | unsigned long lblock, unsigned int size, | |
74 | int absolute, unsigned long new); | |
75 | ||
76 | #define read_metapage(inode, lblock, size, absolute)\ | |
77 | __get_metapage(inode, lblock, size, absolute, FALSE) | |
78 | ||
79 | #define get_metapage(inode, lblock, size, absolute)\ | |
80 | __get_metapage(inode, lblock, size, absolute, TRUE) | |
81 | ||
82 | extern void release_metapage(struct metapage *); | |
83 | extern void hold_metapage(struct metapage *, int); | |
84 | ||
85 | static inline void write_metapage(struct metapage *mp) | |
86 | { | |
87 | set_bit(META_dirty, &mp->flag); | |
88 | release_metapage(mp); | |
89 | } | |
90 | ||
91 | static inline void flush_metapage(struct metapage *mp) | |
92 | { | |
93 | set_bit(META_sync, &mp->flag); | |
94 | write_metapage(mp); | |
95 | } | |
96 | ||
97 | static inline void discard_metapage(struct metapage *mp) | |
98 | { | |
99 | clear_bit(META_dirty, &mp->flag); | |
100 | set_bit(META_discard, &mp->flag); | |
101 | release_metapage(mp); | |
102 | } | |
103 | ||
104 | /* | |
105 | * This routines invalidate all pages for an extent. | |
106 | */ | |
107 | extern void __invalidate_metapages(struct inode *, s64, int); | |
108 | #define invalidate_pxd_metapages(ip, pxd) \ | |
109 | __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd))) | |
110 | #define invalidate_dxd_metapages(ip, dxd) \ | |
111 | __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd))) | |
112 | #define invalidate_xad_metapages(ip, xad) \ | |
113 | __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad))) | |
114 | ||
115 | #endif /* _H_JFS_METAPAGE */ |