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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Kleikamp1868f4a2005-05-04 15:29:35 -05002 * Copyright (C) International Business Machines Corp., 2000-2002
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * 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
24struct 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 */
Dave Kleikamp63f83c92006-10-02 09:55:27 -050036 sector_t index; /* block address of page */
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 wait_queue_head_t wait;
38
39 /* implementation */
40 struct page *page;
Dave Kleikamp7fab4792005-05-02 12:25:02 -060041 unsigned int logical_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43 /* Journal management */
44 int clsn;
Dave Kleikamp7fab4792005-05-02 12:25:02 -060045 int nohomeok;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 struct jfs_log *log;
47};
48
49/* metapage flag */
50#define META_locked 0
Dave Kleikamp7fab4792005-05-02 12:25:02 -060051#define META_dirty 2
52#define META_sync 3
53#define META_discard 4
54#define META_forcewrite 5
55#define META_io 6
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag)
58
59/* function prototypes */
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050060extern int metapage_init(void);
61extern void metapage_exit(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062extern 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)\
Richard Knutsson4d817152006-09-30 23:27:14 -070067 __get_metapage(inode, lblock, size, absolute, false)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69#define get_metapage(inode, lblock, size, absolute)\
Richard Knutsson4d817152006-09-30 23:27:14 -070070 __get_metapage(inode, lblock, size, absolute, true)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72extern void release_metapage(struct metapage *);
Dave Kleikamp7fab4792005-05-02 12:25:02 -060073extern void grab_metapage(struct metapage *);
74extern void force_metapage(struct metapage *);
75
76/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -030077 * hold_metapage and put_metapage are used in conjunction. The page lock
Dave Kleikamp7fab4792005-05-02 12:25:02 -060078 * is not dropped between the two, so no other threads can get or release
79 * the metapage
80 */
81extern void hold_metapage(struct metapage *);
82extern void put_metapage(struct metapage *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
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
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600103static 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 */
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 * This is called when already holding the metapage
127 */
128static inline void _metapage_homeok(struct metapage *mp)
129{
130 if (!--mp->nohomeok)
131 page_cache_release(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
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700141extern const struct address_space_operations jfs_metapage_aops;
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143/*
144 * This routines invalidate all pages for an extent.
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 /* _H_JFS_METAPAGE */