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Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * include/linux/writeback.h |
1da177e4 LT |
3 | */ |
4 | #ifndef WRITEBACK_H | |
5 | #define WRITEBACK_H | |
6 | ||
e8edc6e0 | 7 | #include <linux/sched.h> |
f5ff8422 | 8 | #include <linux/fs.h> |
e8edc6e0 | 9 | |
1da177e4 LT |
10 | struct backing_dev_info; |
11 | ||
12 | extern spinlock_t inode_lock; | |
1da177e4 | 13 | |
1da177e4 LT |
14 | /* |
15 | * fs/fs-writeback.c | |
16 | */ | |
17 | enum writeback_sync_modes { | |
18 | WB_SYNC_NONE, /* Don't wait on anything */ | |
19 | WB_SYNC_ALL, /* Wait on every mapping */ | |
1da177e4 LT |
20 | }; |
21 | ||
22 | /* | |
23 | * A control structure which tells the writeback code what to do. These are | |
24 | * always on the stack, and hence need no locking. They are always initialised | |
25 | * in a manner such that unspecified fields are set to zero. | |
26 | */ | |
27 | struct writeback_control { | |
1da177e4 LT |
28 | enum writeback_sync_modes sync_mode; |
29 | unsigned long *older_than_this; /* If !NULL, only write back inodes | |
30 | older than this */ | |
f11c9c5c ES |
31 | unsigned long wb_start; /* Time writeback_inodes_wb was |
32 | called. This is needed to avoid | |
33 | extra jobs and livelock */ | |
1da177e4 LT |
34 | long nr_to_write; /* Write this many pages, and decrement |
35 | this for each page written */ | |
36 | long pages_skipped; /* Pages which were not written */ | |
37 | ||
38 | /* | |
39 | * For a_ops->writepages(): is start or end are non-zero then this is | |
40 | * a hint that the filesystem need only write out the pages inside that | |
41 | * byterange. The byte at `end' is included in the writeout request. | |
42 | */ | |
111ebb6e OH |
43 | loff_t range_start; |
44 | loff_t range_end; | |
1da177e4 | 45 | |
22905f77 AM |
46 | unsigned nonblocking:1; /* Don't get stuck on request queues */ |
47 | unsigned encountered_congestion:1; /* An output: a queue is full */ | |
48 | unsigned for_kupdate:1; /* A kupdate writeback */ | |
b17621fe | 49 | unsigned for_background:1; /* A background writeback */ |
22905f77 | 50 | unsigned for_reclaim:1; /* Invoked from the page allocator */ |
111ebb6e | 51 | unsigned range_cyclic:1; /* range_start is cyclic */ |
8bc3be27 | 52 | unsigned more_io:1; /* more io to be dispatched */ |
1da177e4 LT |
53 | }; |
54 | ||
1da177e4 LT |
55 | /* |
56 | * fs/fs-writeback.c | |
57 | */ | |
03ba3782 | 58 | struct bdi_writeback; |
1da177e4 | 59 | int inode_wait(void *); |
b6e51316 | 60 | void writeback_inodes_sb(struct super_block *); |
17bd55d0 | 61 | int writeback_inodes_sb_if_idle(struct super_block *); |
b6e51316 | 62 | void sync_inodes_sb(struct super_block *); |
9c3a8ee8 CH |
63 | void writeback_inodes_wb(struct bdi_writeback *wb, |
64 | struct writeback_control *wbc); | |
03ba3782 JA |
65 | long wb_do_writeback(struct bdi_writeback *wb, int force_wait); |
66 | void wakeup_flusher_threads(long nr_pages); | |
1da177e4 LT |
67 | |
68 | /* writeback.h requires fs.h; it, too, is not included from here. */ | |
69 | static inline void wait_on_inode(struct inode *inode) | |
70 | { | |
71 | might_sleep(); | |
eaff8079 | 72 | wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE); |
1da177e4 | 73 | } |
1c0eeaf5 JE |
74 | static inline void inode_sync_wait(struct inode *inode) |
75 | { | |
76 | might_sleep(); | |
77 | wait_on_bit(&inode->i_state, __I_SYNC, inode_wait, | |
78 | TASK_UNINTERRUPTIBLE); | |
79 | } | |
80 | ||
1da177e4 LT |
81 | |
82 | /* | |
83 | * mm/page-writeback.c | |
84 | */ | |
c2c4986e | 85 | #ifdef CONFIG_BLOCK |
31373d09 | 86 | void laptop_io_completion(struct backing_dev_info *info); |
1da177e4 | 87 | void laptop_sync_completion(void); |
31373d09 MG |
88 | void laptop_mode_sync(struct work_struct *work); |
89 | void laptop_mode_timer_fn(unsigned long data); | |
c2c4986e JA |
90 | #else |
91 | static inline void laptop_sync_completion(void) { } | |
92 | #endif | |
232ea4d6 | 93 | void throttle_vm_writeout(gfp_t gfp_mask); |
1da177e4 LT |
94 | |
95 | /* These are exported to sysctl. */ | |
96 | extern int dirty_background_ratio; | |
2da02997 | 97 | extern unsigned long dirty_background_bytes; |
1da177e4 | 98 | extern int vm_dirty_ratio; |
2da02997 | 99 | extern unsigned long vm_dirty_bytes; |
704503d8 AD |
100 | extern unsigned int dirty_writeback_interval; |
101 | extern unsigned int dirty_expire_interval; | |
195cf453 | 102 | extern int vm_highmem_is_dirtyable; |
1da177e4 LT |
103 | extern int block_dump; |
104 | extern int laptop_mode; | |
105 | ||
3eefae99 SR |
106 | extern unsigned long determine_dirtyable_memory(void); |
107 | ||
2da02997 | 108 | extern int dirty_background_ratio_handler(struct ctl_table *table, int write, |
8d65af78 | 109 | void __user *buffer, size_t *lenp, |
2da02997 DR |
110 | loff_t *ppos); |
111 | extern int dirty_background_bytes_handler(struct ctl_table *table, int write, | |
8d65af78 | 112 | void __user *buffer, size_t *lenp, |
2da02997 | 113 | loff_t *ppos); |
04fbfdc1 | 114 | extern int dirty_ratio_handler(struct ctl_table *table, int write, |
8d65af78 | 115 | void __user *buffer, size_t *lenp, |
04fbfdc1 | 116 | loff_t *ppos); |
2da02997 | 117 | extern int dirty_bytes_handler(struct ctl_table *table, int write, |
8d65af78 | 118 | void __user *buffer, size_t *lenp, |
2da02997 | 119 | loff_t *ppos); |
04fbfdc1 | 120 | |
1da177e4 | 121 | struct ctl_table; |
8d65af78 | 122 | int dirty_writeback_centisecs_handler(struct ctl_table *, int, |
1da177e4 LT |
123 | void __user *, size_t *, loff_t *); |
124 | ||
16c4042f WF |
125 | void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty); |
126 | unsigned long bdi_dirty_limit(struct backing_dev_info *bdi, | |
127 | unsigned long dirty); | |
cf0ca9fe | 128 | |
1da177e4 | 129 | void page_writeback_init(void); |
fa5a734e AM |
130 | void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, |
131 | unsigned long nr_pages_dirtied); | |
132 | ||
133 | static inline void | |
134 | balance_dirty_pages_ratelimited(struct address_space *mapping) | |
135 | { | |
136 | balance_dirty_pages_ratelimited_nr(mapping, 1); | |
137 | } | |
138 | ||
0ea97180 MS |
139 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, |
140 | void *data); | |
141 | ||
0ea97180 MS |
142 | int generic_writepages(struct address_space *mapping, |
143 | struct writeback_control *wbc); | |
5b41d924 ES |
144 | void tag_pages_for_writeback(struct address_space *mapping, |
145 | pgoff_t start, pgoff_t end); | |
0ea97180 MS |
146 | int write_cache_pages(struct address_space *mapping, |
147 | struct writeback_control *wbc, writepage_t writepage, | |
148 | void *data); | |
1da177e4 | 149 | int do_writepages(struct address_space *mapping, struct writeback_control *wbc); |
a200ee18 | 150 | void set_page_dirty_balance(struct page *page, int page_mkwrite); |
2d1d43f6 | 151 | void writeback_set_ratelimit(void); |
92c09c04 NK |
152 | void tag_pages_for_writeback(struct address_space *mapping, |
153 | pgoff_t start, pgoff_t end); | |
1da177e4 LT |
154 | |
155 | /* pdflush.c */ | |
156 | extern int nr_pdflush_threads; /* Global so it can be exported to sysctl | |
157 | read-only. */ | |
158 | ||
159 | ||
160 | #endif /* WRITEBACK_H */ |