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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 | sector_t index; /* block address of page */ |
37 | wait_queue_head_t wait; |
38 | |
39 | /* implementation */ |
40 | struct page *page; |
41 | unsigned int logical_size; |
42 | |
43 | /* Journal management */ |
44 | int clsn; |
45 | int nohomeok; |
46 | struct jfs_log *log; |
47 | }; |
48 | |
49 | /* metapage flag */ |
50 | #define META_locked 0 |
51 | #define META_free 1 |
52 | #define META_dirty 2 |
53 | #define META_sync 3 |
54 | #define META_discard 4 |
55 | #define META_forcewrite 5 |
56 | #define META_io 6 |
57 | |
58 | #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) |
59 | |
60 | /* function prototypes */ |
61 | extern int metapage_init(void); |
62 | extern void metapage_exit(void); |
63 | extern struct metapage *__get_metapage(struct inode *inode, |
64 | unsigned long lblock, unsigned int size, |
65 | int absolute, unsigned long new); |
66 | |
67 | #define read_metapage(inode, lblock, size, absolute)\ |
68 | __get_metapage(inode, lblock, size, absolute, false) |
69 | |
70 | #define get_metapage(inode, lblock, size, absolute)\ |
71 | __get_metapage(inode, lblock, size, absolute, true) |
72 | |
73 | extern void release_metapage(struct metapage *); |
74 | extern void grab_metapage(struct metapage *); |
75 | extern void force_metapage(struct metapage *); |
76 | |
77 | /* |
78 | * hold_metapage and put_metapage are used in conjuction. The page lock |
79 | * is not dropped between the two, so no other threads can get or release |
80 | * the metapage |
81 | */ |
82 | extern void hold_metapage(struct metapage *); |
83 | extern void put_metapage(struct metapage *); |
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 | static inline void metapage_nohomeok(struct metapage *mp) |
105 | { |
106 | struct page *page = mp->page; |
107 | lock_page(page); |
108 | if (!mp->nohomeok++) { |
109 | mark_metapage_dirty(mp); |
110 | page_cache_get(page); |
111 | wait_on_page_writeback(page); |
112 | } |
113 | unlock_page(page); |
114 | } |
115 | |
116 | /* |
117 | * This serializes access to mp->lsn when metapages are added to logsynclist |
118 | * without setting nohomeok. i.e. updating imap & dmap |
119 | */ |
120 | static inline void metapage_wait_for_io(struct metapage *mp) |
121 | { |
122 | if (test_bit(META_io, &mp->flag)) |
123 | wait_on_page_writeback(mp->page); |
124 | } |
125 | |
126 | /* |
127 | * This is called when already holding the metapage |
128 | */ |
129 | static inline void _metapage_homeok(struct metapage *mp) |
130 | { |
131 | if (!--mp->nohomeok) |
132 | page_cache_release(mp->page); |
133 | } |
134 | |
135 | static inline void metapage_homeok(struct metapage *mp) |
136 | { |
137 | hold_metapage(mp); |
138 | _metapage_homeok(mp); |
139 | put_metapage(mp); |
140 | } |
141 | |
142 | extern const struct address_space_operations jfs_metapage_aops; |
143 | |
144 | /* |
145 | * This routines invalidate all pages for an extent. |
146 | */ |
147 | extern void __invalidate_metapages(struct inode *, s64, int); |
148 | #define invalidate_pxd_metapages(ip, pxd) \ |
149 | __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd))) |
150 | #define invalidate_dxd_metapages(ip, dxd) \ |
151 | __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd))) |
152 | #define invalidate_xad_metapages(ip, xad) \ |
153 | __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad))) |
154 | |
155 | #endif /* _H_JFS_METAPAGE */ |
156 |
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