1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2002 |
4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
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 */ |
23 | sector_t index; /* block address of page */ |
24 | wait_queue_head_t wait; |
25 | |
26 | /* implementation */ |
27 | struct page *page; |
28 | struct super_block *sb; |
29 | unsigned int logical_size; |
30 | |
31 | /* Journal management */ |
32 | int clsn; |
33 | int nohomeok; |
34 | struct jfs_log *log; |
35 | }; |
36 | |
37 | /* metapage flag */ |
38 | #define META_locked 0 |
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 |
44 | |
45 | #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) |
46 | |
47 | /* function prototypes */ |
48 | extern int metapage_init(void); |
49 | extern void metapage_exit(void); |
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)\ |
55 | __get_metapage(inode, lblock, size, absolute, false) |
56 | |
57 | #define get_metapage(inode, lblock, size, absolute)\ |
58 | __get_metapage(inode, lblock, size, absolute, true) |
59 | |
60 | extern void release_metapage(struct metapage *); |
61 | extern void grab_metapage(struct metapage *); |
62 | extern void force_metapage(struct metapage *); |
63 | |
64 | /* |
65 | * hold_metapage and put_metapage are used in conjunction. The page lock |
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 *); |
71 | |
72 | static inline void write_metapage(struct metapage *mp) |
73 | { |
74 | set_bit(META_dirty, addr: &mp->flag); |
75 | release_metapage(mp); |
76 | } |
77 | |
78 | static inline void flush_metapage(struct metapage *mp) |
79 | { |
80 | set_bit(META_sync, addr: &mp->flag); |
81 | write_metapage(mp); |
82 | } |
83 | |
84 | static inline void discard_metapage(struct metapage *mp) |
85 | { |
86 | clear_bit(META_dirty, addr: &mp->flag); |
87 | set_bit(META_discard, addr: &mp->flag); |
88 | release_metapage(mp); |
89 | } |
90 | |
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); |
97 | get_page(page); |
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(page: 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) |
119 | put_page(page: mp->page); |
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 | |
129 | extern const struct address_space_operations jfs_metapage_aops; |
130 | |
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 */ |
143 | |