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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 | 2 | /* |
1868f4aa DK |
3 | * Copyright (C) International Business Machines Corp., 2000-2002 |
4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 | |
1da177e4 LT |
5 | */ |
6 | #ifndef _H_JFS_METAPAGE | |
7 | #define _H_JFS_METAPAGE | |
8 | ||
9 | #include <linux/pagemap.h> | |
10 | ||
11 | struct metapage { | |
12 | /* Common logsyncblk prefix (see jfs_logmgr.h) */ | |
13 | u16 xflag; | |
14 | u16 unused; | |
15 | lid_t lid; | |
16 | int lsn; | |
17 | struct list_head synclist; | |
18 | /* End of logsyncblk prefix */ | |
19 | ||
20 | unsigned long flag; /* See Below */ | |
21 | unsigned long count; /* Reference count */ | |
22 | void *data; /* Data pointer */ | |
63f83c9f | 23 | sector_t index; /* block address of page */ |
1da177e4 LT |
24 | wait_queue_head_t wait; |
25 | ||
26 | /* implementation */ | |
27 | struct page *page; | |
11ab8319 | 28 | struct super_block *sb; |
7fab479b | 29 | unsigned int logical_size; |
1da177e4 LT |
30 | |
31 | /* Journal management */ | |
32 | int clsn; | |
7fab479b | 33 | int nohomeok; |
1da177e4 LT |
34 | struct jfs_log *log; |
35 | }; | |
36 | ||
37 | /* metapage flag */ | |
38 | #define META_locked 0 | |
7fab479b DK |
39 | #define META_dirty 2 |
40 | #define META_sync 3 | |
41 | #define META_discard 4 | |
42 | #define META_forcewrite 5 | |
43 | #define META_io 6 | |
1da177e4 LT |
44 | |
45 | #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) | |
46 | ||
47 | /* function prototypes */ | |
1868f4aa DK |
48 | extern int metapage_init(void); |
49 | extern void metapage_exit(void); | |
1da177e4 LT |
50 | extern struct metapage *__get_metapage(struct inode *inode, |
51 | unsigned long lblock, unsigned int size, | |
52 | int absolute, unsigned long new); | |
53 | ||
54 | #define read_metapage(inode, lblock, size, absolute)\ | |
4d81715f | 55 | __get_metapage(inode, lblock, size, absolute, false) |
1da177e4 LT |
56 | |
57 | #define get_metapage(inode, lblock, size, absolute)\ | |
4d81715f | 58 | __get_metapage(inode, lblock, size, absolute, true) |
1da177e4 LT |
59 | |
60 | extern void release_metapage(struct metapage *); | |
7fab479b DK |
61 | extern void grab_metapage(struct metapage *); |
62 | extern void force_metapage(struct metapage *); | |
63 | ||
64 | /* | |
25985edc | 65 | * hold_metapage and put_metapage are used in conjunction. The page lock |
7fab479b DK |
66 | * is not dropped between the two, so no other threads can get or release |
67 | * the metapage | |
68 | */ | |
69 | extern void hold_metapage(struct metapage *); | |
70 | extern void put_metapage(struct metapage *); | |
1da177e4 LT |
71 | |
72 | static inline void write_metapage(struct metapage *mp) | |
73 | { | |
74 | set_bit(META_dirty, &mp->flag); | |
75 | release_metapage(mp); | |
76 | } | |
77 | ||
78 | static inline void flush_metapage(struct metapage *mp) | |
79 | { | |
80 | set_bit(META_sync, &mp->flag); | |
81 | write_metapage(mp); | |
82 | } | |
83 | ||
84 | static inline void discard_metapage(struct metapage *mp) | |
85 | { | |
86 | clear_bit(META_dirty, &mp->flag); | |
87 | set_bit(META_discard, &mp->flag); | |
88 | release_metapage(mp); | |
89 | } | |
90 | ||
7fab479b DK |
91 | static inline void metapage_nohomeok(struct metapage *mp) |
92 | { | |
93 | struct page *page = mp->page; | |
94 | lock_page(page); | |
95 | if (!mp->nohomeok++) { | |
96 | mark_metapage_dirty(mp); | |
09cbfeaf | 97 | get_page(page); |
7fab479b DK |
98 | wait_on_page_writeback(page); |
99 | } | |
100 | unlock_page(page); | |
101 | } | |
102 | ||
103 | /* | |
104 | * This serializes access to mp->lsn when metapages are added to logsynclist | |
105 | * without setting nohomeok. i.e. updating imap & dmap | |
106 | */ | |
107 | static inline void metapage_wait_for_io(struct metapage *mp) | |
108 | { | |
109 | if (test_bit(META_io, &mp->flag)) | |
110 | wait_on_page_writeback(mp->page); | |
111 | } | |
112 | ||
113 | /* | |
114 | * This is called when already holding the metapage | |
115 | */ | |
116 | static inline void _metapage_homeok(struct metapage *mp) | |
117 | { | |
118 | if (!--mp->nohomeok) | |
09cbfeaf | 119 | put_page(mp->page); |
7fab479b DK |
120 | } |
121 | ||
122 | static inline void metapage_homeok(struct metapage *mp) | |
123 | { | |
124 | hold_metapage(mp); | |
125 | _metapage_homeok(mp); | |
126 | put_metapage(mp); | |
127 | } | |
128 | ||
f5e54d6e | 129 | extern const struct address_space_operations jfs_metapage_aops; |
7fab479b | 130 | |
1da177e4 LT |
131 | /* |
132 | * This routines invalidate all pages for an extent. | |
133 | */ | |
134 | extern void __invalidate_metapages(struct inode *, s64, int); | |
135 | #define invalidate_pxd_metapages(ip, pxd) \ | |
136 | __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd))) | |
137 | #define invalidate_dxd_metapages(ip, dxd) \ | |
138 | __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd))) | |
139 | #define invalidate_xad_metapages(ip, xad) \ | |
140 | __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad))) | |
141 | ||
142 | #endif /* _H_JFS_METAPAGE */ |