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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_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 /* function prototypes */
60 extern int metapage_init(void);
61 extern void metapage_exit(void);
62 extern 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
72 extern void release_metapage(struct metapage *);
73 extern void grab_metapage(struct metapage *);
74 extern void force_metapage(struct metapage *);
75
76 /*
77 * hold_metapage and put_metapage are used in conjunction. The page lock
78 * is not dropped between the two, so no other threads can get or release
79 * the metapage
80 */
81 extern void hold_metapage(struct metapage *);
82 extern void put_metapage(struct metapage *);
83
84 static inline void write_metapage(struct metapage *mp)
85 {
86 set_bit(META_dirty, &mp->flag);
87 release_metapage(mp);
88 }
89
90 static inline void flush_metapage(struct metapage *mp)
91 {
92 set_bit(META_sync, &mp->flag);
93 write_metapage(mp);
94 }
95
96 static 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
103 static 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 page_cache_get(page);
110 wait_on_page_writeback(page);
111 }
112 unlock_page(page);
113 }
114
115 /*
116 * This serializes access to mp->lsn when metapages are added to logsynclist
117 * without setting nohomeok. i.e. updating imap & dmap
118 */
119 static 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 * This is called when already holding the metapage
127 */
128 static inline void _metapage_homeok(struct metapage *mp)
129 {
130 if (!--mp->nohomeok)
131 page_cache_release(mp->page);
132 }
133
134 static inline void metapage_homeok(struct metapage *mp)
135 {
136 hold_metapage(mp);
137 _metapage_homeok(mp);
138 put_metapage(mp);
139 }
140
141 extern const struct address_space_operations jfs_metapage_aops;
142
143 /*
144 * This routines invalidate all pages for an extent.
145 */
146 extern 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 /* _H_JFS_METAPAGE */