Blame view
include/linux/writeback.h
6.26 KB
1da177e4c Linux-2.6.12-rc2 |
1 |
/* |
f30c22695 fix file specific... |
2 |
* include/linux/writeback.h |
1da177e4c Linux-2.6.12-rc2 |
3 4 5 |
*/ #ifndef WRITEBACK_H #define WRITEBACK_H |
e8edc6e03 Detach sched.h fr... |
6 |
#include <linux/sched.h> |
f5ff8422b Fix warnings with... |
7 |
#include <linux/fs.h> |
e8edc6e03 Detach sched.h fr... |
8 |
|
54848d73f writeback: charge... |
9 |
DECLARE_PER_CPU(int, dirty_throttle_leaks); |
ffd1f609a writeback: introd... |
10 |
/* |
1a12d8bd7 writeback: scale ... |
11 12 13 14 |
* The 1/4 region under the global dirty thresh is for smooth dirty throttling: * * (thresh - thresh/DIRTY_FULL_SCOPE, thresh) * |
ffd1f609a writeback: introd... |
15 16 17 18 19 20 21 22 |
* Further beyond, all dirtier tasks will enter a loop waiting (possibly long * time) for the dirty pages to drop, unless written enough pages. * * The global dirty threshold is normally equal to the global dirty limit, * except when the system suddenly allocates a lot of anonymous memory and * knocks down the global dirty threshold quickly, in which case the global * dirty limit will follow down slowly to prevent livelocking all dirtier tasks. */ |
1a12d8bd7 writeback: scale ... |
23 24 |
#define DIRTY_SCOPE 8 #define DIRTY_FULL_SCOPE (DIRTY_SCOPE / 2) |
ffd1f609a writeback: introd... |
25 |
|
1da177e4c Linux-2.6.12-rc2 |
26 |
struct backing_dev_info; |
1da177e4c Linux-2.6.12-rc2 |
27 |
/* |
1da177e4c Linux-2.6.12-rc2 |
28 29 30 31 32 |
* fs/fs-writeback.c */ enum writeback_sync_modes { WB_SYNC_NONE, /* Don't wait on anything */ WB_SYNC_ALL, /* Wait on every mapping */ |
1da177e4c Linux-2.6.12-rc2 |
33 34 35 |
}; /* |
0e175a183 writeback: Add a ... |
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 |
* why some writeback work was initiated */ enum wb_reason { WB_REASON_BACKGROUND, WB_REASON_TRY_TO_FREE_PAGES, WB_REASON_SYNC, WB_REASON_PERIODIC, WB_REASON_LAPTOP_TIMER, WB_REASON_FREE_MORE_MEM, WB_REASON_FS_FREE_SPACE, WB_REASON_FORKER_THREAD, WB_REASON_MAX, }; extern const char *wb_reason_name[]; /* |
1da177e4c Linux-2.6.12-rc2 |
53 54 55 56 57 |
* A control structure which tells the writeback code what to do. These are * always on the stack, and hence need no locking. They are always initialised * in a manner such that unspecified fields are set to zero. */ struct writeback_control { |
1da177e4c Linux-2.6.12-rc2 |
58 |
enum writeback_sync_modes sync_mode; |
1da177e4c Linux-2.6.12-rc2 |
59 60 61 62 63 64 65 66 67 |
long nr_to_write; /* Write this many pages, and decrement this for each page written */ long pages_skipped; /* Pages which were not written */ /* * For a_ops->writepages(): is start or end are non-zero then this is * a hint that the filesystem need only write out the pages inside that * byterange. The byte at `end' is included in the writeout request. */ |
111ebb6e6 [PATCH] writeback... |
68 69 |
loff_t range_start; loff_t range_end; |
1da177e4c Linux-2.6.12-rc2 |
70 |
|
22905f775 identify multipag... |
71 |
unsigned for_kupdate:1; /* A kupdate writeback */ |
b17621fed writeback: introd... |
72 |
unsigned for_background:1; /* A background writeback */ |
6e6938b6d writeback: introd... |
73 |
unsigned tagged_writepages:1; /* tag-and-write to avoid livelock */ |
22905f775 identify multipag... |
74 |
unsigned for_reclaim:1; /* Invoked from the page allocator */ |
111ebb6e6 [PATCH] writeback... |
75 |
unsigned range_cyclic:1; /* range_start is cyclic */ |
1da177e4c Linux-2.6.12-rc2 |
76 77 78 |
}; /* |
1da177e4c Linux-2.6.12-rc2 |
79 80 |
* fs/fs-writeback.c */ |
03ba3782e writeback: switch... |
81 |
struct bdi_writeback; |
1da177e4c Linux-2.6.12-rc2 |
82 |
int inode_wait(void *); |
0e175a183 writeback: Add a ... |
83 84 85 86 87 88 |
void writeback_inodes_sb(struct super_block *, enum wb_reason reason); void writeback_inodes_sb_nr(struct super_block *, unsigned long nr, enum wb_reason reason); int writeback_inodes_sb_if_idle(struct super_block *, enum wb_reason reason); int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr, enum wb_reason reason); |
b6e51316d writeback: separa... |
89 |
void sync_inodes_sb(struct super_block *); |
0e175a183 writeback: Add a ... |
90 91 |
long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages, enum wb_reason reason); |
03ba3782e writeback: switch... |
92 |
long wb_do_writeback(struct bdi_writeback *wb, int force_wait); |
0e175a183 writeback: Add a ... |
93 |
void wakeup_flusher_threads(long nr_pages, enum wb_reason reason); |
1da177e4c Linux-2.6.12-rc2 |
94 95 96 97 98 |
/* writeback.h requires fs.h; it, too, is not included from here. */ static inline void wait_on_inode(struct inode *inode) { might_sleep(); |
eaff8079d kill I_LOCK |
99 |
wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
100 |
} |
1c0eeaf56 introduce I_SYNC |
101 102 103 104 105 106 |
static inline void inode_sync_wait(struct inode *inode) { might_sleep(); wait_on_bit(&inode->i_state, __I_SYNC, inode_wait, TASK_UNINTERRUPTIBLE); } |
1da177e4c Linux-2.6.12-rc2 |
107 108 109 110 |
/* * mm/page-writeback.c */ |
c2c4986ed writeback: fix pr... |
111 |
#ifdef CONFIG_BLOCK |
31373d09d laptop-mode: Make... |
112 |
void laptop_io_completion(struct backing_dev_info *info); |
1da177e4c Linux-2.6.12-rc2 |
113 |
void laptop_sync_completion(void); |
31373d09d laptop-mode: Make... |
114 115 |
void laptop_mode_sync(struct work_struct *work); void laptop_mode_timer_fn(unsigned long data); |
c2c4986ed writeback: fix pr... |
116 117 118 |
#else static inline void laptop_sync_completion(void) { } #endif |
232ea4d69 [PATCH] throttle_... |
119 |
void throttle_vm_writeout(gfp_t gfp_mask); |
a756cf590 mm: try to distri... |
120 |
bool zone_dirty_ok(struct zone *zone); |
1da177e4c Linux-2.6.12-rc2 |
121 |
|
c42843f2f writeback: introd... |
122 |
extern unsigned long global_dirty_limit; |
1da177e4c Linux-2.6.12-rc2 |
123 124 |
/* These are exported to sysctl. */ extern int dirty_background_ratio; |
2da02997e mm: add dirty_bac... |
125 |
extern unsigned long dirty_background_bytes; |
1da177e4c Linux-2.6.12-rc2 |
126 |
extern int vm_dirty_ratio; |
2da02997e mm: add dirty_bac... |
127 |
extern unsigned long vm_dirty_bytes; |
704503d83 mm: fix proc_doin... |
128 129 |
extern unsigned int dirty_writeback_interval; extern unsigned int dirty_expire_interval; |
195cf453d mm/page-writeback... |
130 |
extern int vm_highmem_is_dirtyable; |
1da177e4c Linux-2.6.12-rc2 |
131 132 |
extern int block_dump; extern int laptop_mode; |
2da02997e mm: add dirty_bac... |
133 |
extern int dirty_background_ratio_handler(struct ctl_table *table, int write, |
8d65af789 sysctl: remove "s... |
134 |
void __user *buffer, size_t *lenp, |
2da02997e mm: add dirty_bac... |
135 136 |
loff_t *ppos); extern int dirty_background_bytes_handler(struct ctl_table *table, int write, |
8d65af789 sysctl: remove "s... |
137 |
void __user *buffer, size_t *lenp, |
2da02997e mm: add dirty_bac... |
138 |
loff_t *ppos); |
04fbfdc14 mm: per device di... |
139 |
extern int dirty_ratio_handler(struct ctl_table *table, int write, |
8d65af789 sysctl: remove "s... |
140 |
void __user *buffer, size_t *lenp, |
04fbfdc14 mm: per device di... |
141 |
loff_t *ppos); |
2da02997e mm: add dirty_bac... |
142 |
extern int dirty_bytes_handler(struct ctl_table *table, int write, |
8d65af789 sysctl: remove "s... |
143 |
void __user *buffer, size_t *lenp, |
2da02997e mm: add dirty_bac... |
144 |
loff_t *ppos); |
04fbfdc14 mm: per device di... |
145 |
|
1da177e4c Linux-2.6.12-rc2 |
146 |
struct ctl_table; |
8d65af789 sysctl: remove "s... |
147 |
int dirty_writeback_centisecs_handler(struct ctl_table *, int, |
1da177e4c Linux-2.6.12-rc2 |
148 |
void __user *, size_t *, loff_t *); |
16c4042f0 writeback: avoid ... |
149 150 151 |
void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty); unsigned long bdi_dirty_limit(struct backing_dev_info *bdi, unsigned long dirty); |
cf0ca9fe5 mm: bdi: export B... |
152 |
|
e98be2d59 writeback: bdi wr... |
153 |
void __bdi_update_bandwidth(struct backing_dev_info *bdi, |
c42843f2f writeback: introd... |
154 |
unsigned long thresh, |
af6a31138 writeback: add bg... |
155 |
unsigned long bg_thresh, |
c42843f2f writeback: introd... |
156 157 158 |
unsigned long dirty, unsigned long bdi_thresh, unsigned long bdi_dirty, |
e98be2d59 writeback: bdi wr... |
159 |
unsigned long start_time); |
1da177e4c Linux-2.6.12-rc2 |
160 |
void page_writeback_init(void); |
fa5a734e4 [PATCH] balance_d... |
161 162 163 164 165 166 167 168 |
void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, unsigned long nr_pages_dirtied); static inline void balance_dirty_pages_ratelimited(struct address_space *mapping) { balance_dirty_pages_ratelimited_nr(mapping, 1); } |
0ea971801 consolidate gener... |
169 170 |
typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, void *data); |
0ea971801 consolidate gener... |
171 172 |
int generic_writepages(struct address_space *mapping, struct writeback_control *wbc); |
5b41d9243 ext4: implement w... |
173 174 |
void tag_pages_for_writeback(struct address_space *mapping, pgoff_t start, pgoff_t end); |
0ea971801 consolidate gener... |
175 176 177 |
int write_cache_pages(struct address_space *mapping, struct writeback_control *wbc, writepage_t writepage, void *data); |
1da177e4c Linux-2.6.12-rc2 |
178 |
int do_writepages(struct address_space *mapping, struct writeback_control *wbc); |
a200ee182 mm: set_page_dirt... |
179 |
void set_page_dirty_balance(struct page *page, int page_mkwrite); |
2d1d43f6a [PATCH] call mm/p... |
180 |
void writeback_set_ratelimit(void); |
92c09c041 mm: declare some ... |
181 182 |
void tag_pages_for_writeback(struct address_space *mapping, pgoff_t start, pgoff_t end); |
1da177e4c Linux-2.6.12-rc2 |
183 |
|
2f800fbd7 writeback: fix di... |
184 |
void account_page_redirty(struct page *page); |
1da177e4c Linux-2.6.12-rc2 |
185 186 187 188 189 190 |
/* pdflush.c */ extern int nr_pdflush_threads; /* Global so it can be exported to sysctl read-only. */ #endif /* WRITEBACK_H */ |