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 { | |
30 | struct backing_dev_info *bdi; /* If !NULL, only write back this | |
31 | queue */ | |
03ba3782 JA |
32 | struct super_block *sb; /* if !NULL, only write inodes from |
33 | this super_block */ | |
1da177e4 LT |
34 | enum writeback_sync_modes sync_mode; |
35 | unsigned long *older_than_this; /* If !NULL, only write back inodes | |
36 | older than this */ | |
37 | long nr_to_write; /* Write this many pages, and decrement | |
38 | this for each page written */ | |
39 | long pages_skipped; /* Pages which were not written */ | |
40 | ||
41 | /* | |
42 | * For a_ops->writepages(): is start or end are non-zero then this is | |
43 | * a hint that the filesystem need only write out the pages inside that | |
44 | * byterange. The byte at `end' is included in the writeout request. | |
45 | */ | |
111ebb6e OH |
46 | loff_t range_start; |
47 | loff_t range_end; | |
1da177e4 | 48 | |
22905f77 AM |
49 | unsigned nonblocking:1; /* Don't get stuck on request queues */ |
50 | unsigned encountered_congestion:1; /* An output: a queue is full */ | |
51 | unsigned for_kupdate:1; /* A kupdate writeback */ | |
b17621fe | 52 | unsigned for_background:1; /* A background writeback */ |
22905f77 | 53 | unsigned for_reclaim:1; /* Invoked from the page allocator */ |
111ebb6e | 54 | unsigned range_cyclic:1; /* range_start is cyclic */ |
8bc3be27 | 55 | unsigned more_io:1; /* more io to be dispatched */ |
17bc6c30 AK |
56 | /* |
57 | * write_cache_pages() won't update wbc->nr_to_write and | |
58 | * mapping->writeback_index if no_nrwrite_index_update | |
59 | * is set. write_cache_pages() may write more than we | |
60 | * requested and we want to make sure nr_to_write and | |
61 | * writeback_index are updated in a consistent manner | |
62 | * so we use a single control to update them | |
63 | */ | |
64 | unsigned no_nrwrite_index_update:1; | |
1da177e4 LT |
65 | }; |
66 | ||
1da177e4 LT |
67 | /* |
68 | * fs/fs-writeback.c | |
69 | */ | |
03ba3782 | 70 | struct bdi_writeback; |
1da177e4 | 71 | int inode_wait(void *); |
b6e51316 JA |
72 | void writeback_inodes_sb(struct super_block *); |
73 | void sync_inodes_sb(struct super_block *); | |
03ba3782 JA |
74 | void writeback_inodes_wbc(struct writeback_control *wbc); |
75 | long wb_do_writeback(struct bdi_writeback *wb, int force_wait); | |
76 | void wakeup_flusher_threads(long nr_pages); | |
1da177e4 LT |
77 | |
78 | /* writeback.h requires fs.h; it, too, is not included from here. */ | |
79 | static inline void wait_on_inode(struct inode *inode) | |
80 | { | |
81 | might_sleep(); | |
eaff8079 | 82 | wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE); |
1da177e4 | 83 | } |
1c0eeaf5 JE |
84 | static 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 | ||
1da177e4 LT |
91 | |
92 | /* | |
93 | * mm/page-writeback.c | |
94 | */ | |
1da177e4 LT |
95 | void laptop_io_completion(void); |
96 | void laptop_sync_completion(void); | |
232ea4d6 | 97 | void throttle_vm_writeout(gfp_t gfp_mask); |
1da177e4 LT |
98 | |
99 | /* These are exported to sysctl. */ | |
100 | extern int dirty_background_ratio; | |
2da02997 | 101 | extern unsigned long dirty_background_bytes; |
1da177e4 | 102 | extern int vm_dirty_ratio; |
2da02997 | 103 | extern unsigned long vm_dirty_bytes; |
704503d8 AD |
104 | extern unsigned int dirty_writeback_interval; |
105 | extern unsigned int dirty_expire_interval; | |
195cf453 | 106 | extern int vm_highmem_is_dirtyable; |
1da177e4 LT |
107 | extern int block_dump; |
108 | extern int laptop_mode; | |
109 | ||
3eefae99 SR |
110 | extern unsigned long determine_dirtyable_memory(void); |
111 | ||
2da02997 | 112 | extern int dirty_background_ratio_handler(struct ctl_table *table, int write, |
8d65af78 | 113 | void __user *buffer, size_t *lenp, |
2da02997 DR |
114 | loff_t *ppos); |
115 | extern int dirty_background_bytes_handler(struct ctl_table *table, int write, | |
8d65af78 | 116 | void __user *buffer, size_t *lenp, |
2da02997 | 117 | loff_t *ppos); |
04fbfdc1 | 118 | extern int dirty_ratio_handler(struct ctl_table *table, int write, |
8d65af78 | 119 | void __user *buffer, size_t *lenp, |
04fbfdc1 | 120 | loff_t *ppos); |
2da02997 | 121 | extern int dirty_bytes_handler(struct ctl_table *table, int write, |
8d65af78 | 122 | void __user *buffer, size_t *lenp, |
2da02997 | 123 | loff_t *ppos); |
04fbfdc1 | 124 | |
1da177e4 | 125 | struct ctl_table; |
8d65af78 | 126 | int dirty_writeback_centisecs_handler(struct ctl_table *, int, |
1da177e4 LT |
127 | void __user *, size_t *, loff_t *); |
128 | ||
364aeb28 DR |
129 | void get_dirty_limits(unsigned long *pbackground, unsigned long *pdirty, |
130 | unsigned long *pbdi_dirty, struct backing_dev_info *bdi); | |
cf0ca9fe | 131 | |
1da177e4 | 132 | void page_writeback_init(void); |
fa5a734e AM |
133 | void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, |
134 | unsigned long nr_pages_dirtied); | |
135 | ||
136 | static inline void | |
137 | balance_dirty_pages_ratelimited(struct address_space *mapping) | |
138 | { | |
139 | balance_dirty_pages_ratelimited_nr(mapping, 1); | |
140 | } | |
141 | ||
0ea97180 MS |
142 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, |
143 | void *data); | |
144 | ||
0ea97180 MS |
145 | int generic_writepages(struct address_space *mapping, |
146 | struct writeback_control *wbc); | |
147 | int write_cache_pages(struct address_space *mapping, | |
148 | struct writeback_control *wbc, writepage_t writepage, | |
149 | void *data); | |
1da177e4 | 150 | int do_writepages(struct address_space *mapping, struct writeback_control *wbc); |
a200ee18 | 151 | void set_page_dirty_balance(struct page *page, int page_mkwrite); |
2d1d43f6 | 152 | void writeback_set_ratelimit(void); |
1da177e4 LT |
153 | |
154 | /* pdflush.c */ | |
155 | extern int nr_pdflush_threads; /* Global so it can be exported to sysctl | |
156 | read-only. */ | |
157 | ||
158 | ||
159 | #endif /* WRITEBACK_H */ |