1
2
3
4#ifndef WRITEBACK_H
5#define WRITEBACK_H
6
7#include <linux/sched.h>
8#include <linux/fs.h>
9
10struct backing_dev_info;
11
12extern spinlock_t inode_lock;
13extern struct list_head inode_in_use;
14extern struct list_head inode_unused;
15
16
17
18
19enum writeback_sync_modes {
20 WB_SYNC_NONE,
21 WB_SYNC_ALL,
22};
23
24
25
26
27
28
29struct writeback_control {
30 struct backing_dev_info *bdi;
31
32 struct super_block *sb;
33
34 enum writeback_sync_modes sync_mode;
35 unsigned long *older_than_this;
36
37 long nr_to_write;
38
39 long pages_skipped;
40
41
42
43
44
45
46 loff_t range_start;
47 loff_t range_end;
48
49 unsigned nonblocking:1;
50 unsigned encountered_congestion:1;
51 unsigned for_kupdate:1;
52 unsigned for_reclaim:1;
53 unsigned range_cyclic:1;
54 unsigned more_io:1;
55
56
57
58
59
60
61
62
63 unsigned no_nrwrite_index_update:1;
64};
65
66
67
68
69struct bdi_writeback;
70int inode_wait(void *);
71void writeback_inodes_sb(struct super_block *);
72void sync_inodes_sb(struct super_block *);
73void writeback_inodes_wbc(struct writeback_control *wbc);
74long wb_do_writeback(struct bdi_writeback *wb, int force_wait);
75void wakeup_flusher_threads(long nr_pages);
76
77
78static inline void wait_on_inode(struct inode *inode)
79{
80 might_sleep();
81 wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,
82 TASK_UNINTERRUPTIBLE);
83}
84static inline void inode_sync_wait(struct inode *inode)
85{
86 might_sleep();
87 wait_on_bit(&inode->i_state, __I_SYNC, inode_wait,
88 TASK_UNINTERRUPTIBLE);
89}
90
91
92
93
94
95void laptop_io_completion(void);
96void laptop_sync_completion(void);
97void throttle_vm_writeout(gfp_t gfp_mask);
98
99
100extern int dirty_background_ratio;
101extern unsigned long dirty_background_bytes;
102extern int vm_dirty_ratio;
103extern unsigned long vm_dirty_bytes;
104extern unsigned int dirty_writeback_interval;
105extern unsigned int dirty_expire_interval;
106extern int vm_highmem_is_dirtyable;
107extern int block_dump;
108extern int laptop_mode;
109
110extern unsigned long determine_dirtyable_memory(void);
111
112extern int dirty_background_ratio_handler(struct ctl_table *table, int write,
113 void __user *buffer, size_t *lenp,
114 loff_t *ppos);
115extern int dirty_background_bytes_handler(struct ctl_table *table, int write,
116 void __user *buffer, size_t *lenp,
117 loff_t *ppos);
118extern int dirty_ratio_handler(struct ctl_table *table, int write,
119 void __user *buffer, size_t *lenp,
120 loff_t *ppos);
121extern int dirty_bytes_handler(struct ctl_table *table, int write,
122 void __user *buffer, size_t *lenp,
123 loff_t *ppos);
124
125struct ctl_table;
126int dirty_writeback_centisecs_handler(struct ctl_table *, int,
127 void __user *, size_t *, loff_t *);
128
129void get_dirty_limits(unsigned long *pbackground, unsigned long *pdirty,
130 unsigned long *pbdi_dirty, struct backing_dev_info *bdi);
131
132void page_writeback_init(void);
133void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
134 unsigned long nr_pages_dirtied);
135
136static inline void
137balance_dirty_pages_ratelimited(struct address_space *mapping)
138{
139 balance_dirty_pages_ratelimited_nr(mapping, 1);
140}
141
142typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
143 void *data);
144
145int generic_writepages(struct address_space *mapping,
146 struct writeback_control *wbc);
147int write_cache_pages(struct address_space *mapping,
148 struct writeback_control *wbc, writepage_t writepage,
149 void *data);
150int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
151void set_page_dirty_balance(struct page *page, int page_mkwrite);
152void writeback_set_ratelimit(void);
153
154
155extern int nr_pdflush_threads;
156
157
158
159#endif
160