Commit | Line | Data |
---|---|---|
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; | |
13 | extern struct list_head inode_in_use; | |
14 | extern struct list_head inode_unused; | |
15 | ||
1da177e4 LT |
16 | /* |
17 | * fs/fs-writeback.c | |
18 | */ | |
19 | enum writeback_sync_modes { | |
20 | WB_SYNC_NONE, /* Don't wait on anything */ | |
21 | WB_SYNC_ALL, /* Wait on every mapping */ | |
1da177e4 LT |
22 | }; |
23 | ||
24 | /* | |
25 | * A control structure which tells the writeback code what to do. These are | |
26 | * always on the stack, and hence need no locking. They are always initialised | |
27 | * in a manner such that unspecified fields are set to zero. | |
28 | */ | |
29 | struct writeback_control { | |
1da177e4 LT |
30 | enum writeback_sync_modes sync_mode; |
31 | unsigned long *older_than_this; /* If !NULL, only write back inodes | |
32 | older than this */ | |
f11c9c5c ES |
33 | unsigned long wb_start; /* Time writeback_inodes_wb was |
34 | called. This is needed to avoid | |
35 | extra jobs and livelock */ | |
1da177e4 LT |
36 | long nr_to_write; /* Write this many pages, and decrement |
37 | this for each page written */ | |
38 | long pages_skipped; /* Pages which were not written */ | |
39 | ||
40 | /* | |
41 | * For a_ops->writepages(): is start or end are non-zero then this is | |
42 | * a hint that the filesystem need only write out the pages inside that | |
43 | * byterange. The byte at `end' is included in the writeout request. | |
44 | */ | |
111ebb6e OH |
45 | loff_t range_start; |
46 | loff_t range_end; | |
1da177e4 | 47 | |
22905f77 AM |
48 | unsigned nonblocking:1; /* Don't get stuck on request queues */ |
49 | unsigned encountered_congestion:1; /* An output: a queue is full */ | |
50 | unsigned for_kupdate:1; /* A kupdate writeback */ | |
b17621fe | 51 | unsigned for_background:1; /* A background writeback */ |
22905f77 | 52 | unsigned for_reclaim:1; /* Invoked from the page allocator */ |
111ebb6e | 53 | unsigned range_cyclic:1; /* range_start is cyclic */ |
8bc3be27 | 54 | unsigned more_io:1; /* more io to be dispatched */ |
1da177e4 LT |
55 | }; |
56 | ||
1da177e4 LT |
57 | /* |
58 | * fs/fs-writeback.c | |
59 | */ | |
03ba3782 | 60 | struct bdi_writeback; |
1da177e4 | 61 | int inode_wait(void *); |
b6e51316 | 62 | void writeback_inodes_sb(struct super_block *); |
17bd55d0 | 63 | int writeback_inodes_sb_if_idle(struct super_block *); |
b6e51316 | 64 | void sync_inodes_sb(struct super_block *); |
9c3a8ee8 CH |
65 | void writeback_inodes_wb(struct bdi_writeback *wb, |
66 | struct writeback_control *wbc); | |
03ba3782 JA |
67 | long wb_do_writeback(struct bdi_writeback *wb, int force_wait); |
68 | void wakeup_flusher_threads(long nr_pages); | |
1da177e4 LT |
69 | |
70 | /* writeback.h requires fs.h; it, too, is not included from here. */ | |
71 | static inline void wait_on_inode(struct inode *inode) | |
72 | { | |
73 | might_sleep(); | |
eaff8079 | 74 | wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE); |
1da177e4 | 75 | } |
1c0eeaf5 JE |
76 | static inline void inode_sync_wait(struct inode *inode) |
77 | { | |
78 | might_sleep(); | |
79 | wait_on_bit(&inode->i_state, __I_SYNC, inode_wait, | |
80 | TASK_UNINTERRUPTIBLE); | |
81 | } | |
82 | ||
1da177e4 LT |
83 | |
84 | /* | |
85 | * mm/page-writeback.c | |
86 | */ | |
c2c4986e | 87 | #ifdef CONFIG_BLOCK |
31373d09 | 88 | void laptop_io_completion(struct backing_dev_info *info); |
1da177e4 | 89 | void laptop_sync_completion(void); |
31373d09 MG |
90 | void laptop_mode_sync(struct work_struct *work); |
91 | void laptop_mode_timer_fn(unsigned long data); | |
c2c4986e JA |
92 | #else |
93 | static inline void laptop_sync_completion(void) { } | |
94 | #endif | |
232ea4d6 | 95 | void throttle_vm_writeout(gfp_t gfp_mask); |
1da177e4 LT |
96 | |
97 | /* These are exported to sysctl. */ | |
98 | extern int dirty_background_ratio; | |
2da02997 | 99 | extern unsigned long dirty_background_bytes; |
1da177e4 | 100 | extern int vm_dirty_ratio; |
2da02997 | 101 | extern unsigned long vm_dirty_bytes; |
704503d8 AD |
102 | extern unsigned int dirty_writeback_interval; |
103 | extern unsigned int dirty_expire_interval; | |
195cf453 | 104 | extern int vm_highmem_is_dirtyable; |
1da177e4 LT |
105 | extern int block_dump; |
106 | extern int laptop_mode; | |
107 | ||
3eefae99 SR |
108 | extern unsigned long determine_dirtyable_memory(void); |
109 | ||
2da02997 | 110 | extern int dirty_background_ratio_handler(struct ctl_table *table, int write, |
8d65af78 | 111 | void __user *buffer, size_t *lenp, |
2da02997 DR |
112 | loff_t *ppos); |
113 | extern int dirty_background_bytes_handler(struct ctl_table *table, int write, | |
8d65af78 | 114 | void __user *buffer, size_t *lenp, |
2da02997 | 115 | loff_t *ppos); |
04fbfdc1 | 116 | extern int dirty_ratio_handler(struct ctl_table *table, int write, |
8d65af78 | 117 | void __user *buffer, size_t *lenp, |
04fbfdc1 | 118 | loff_t *ppos); |
2da02997 | 119 | extern int dirty_bytes_handler(struct ctl_table *table, int write, |
8d65af78 | 120 | void __user *buffer, size_t *lenp, |
2da02997 | 121 | loff_t *ppos); |
04fbfdc1 | 122 | |
1da177e4 | 123 | struct ctl_table; |
8d65af78 | 124 | int dirty_writeback_centisecs_handler(struct ctl_table *, int, |
1da177e4 LT |
125 | void __user *, size_t *, loff_t *); |
126 | ||
364aeb28 DR |
127 | void get_dirty_limits(unsigned long *pbackground, unsigned long *pdirty, |
128 | unsigned long *pbdi_dirty, struct backing_dev_info *bdi); | |
cf0ca9fe | 129 | |
1da177e4 | 130 | void page_writeback_init(void); |
fa5a734e AM |
131 | void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, |
132 | unsigned long nr_pages_dirtied); | |
133 | ||
134 | static inline void | |
135 | balance_dirty_pages_ratelimited(struct address_space *mapping) | |
136 | { | |
137 | balance_dirty_pages_ratelimited_nr(mapping, 1); | |
138 | } | |
139 | ||
0ea97180 MS |
140 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, |
141 | void *data); | |
142 | ||
0ea97180 MS |
143 | int generic_writepages(struct address_space *mapping, |
144 | struct writeback_control *wbc); | |
145 | int write_cache_pages(struct address_space *mapping, | |
146 | struct writeback_control *wbc, writepage_t writepage, | |
147 | void *data); | |
1da177e4 | 148 | int do_writepages(struct address_space *mapping, struct writeback_control *wbc); |
a200ee18 | 149 | void set_page_dirty_balance(struct page *page, int page_mkwrite); |
2d1d43f6 | 150 | void writeback_set_ratelimit(void); |
1da177e4 LT |
151 | |
152 | /* pdflush.c */ | |
153 | extern int nr_pdflush_threads; /* Global so it can be exported to sysctl | |
154 | read-only. */ | |
155 | ||
156 | ||
157 | #endif /* WRITEBACK_H */ |