Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * include/linux/writeback.h |
1da177e4 LT |
3 | */ |
4 | #ifndef WRITEBACK_H | |
5 | #define WRITEBACK_H | |
6 | ||
e8edc6e0 AD |
7 | #include <linux/sched.h> |
8 | ||
1da177e4 LT |
9 | struct backing_dev_info; |
10 | ||
11 | extern spinlock_t inode_lock; | |
12 | extern struct list_head inode_in_use; | |
13 | extern struct list_head inode_unused; | |
14 | ||
15 | /* | |
16 | * Yes, writeback.h requires sched.h | |
17 | * No, sched.h is not included from here. | |
18 | */ | |
22e2c507 | 19 | static inline int task_is_pdflush(struct task_struct *task) |
1da177e4 | 20 | { |
22e2c507 | 21 | return task->flags & PF_FLUSHER; |
1da177e4 LT |
22 | } |
23 | ||
22e2c507 JA |
24 | #define current_is_pdflush() task_is_pdflush(current) |
25 | ||
1da177e4 LT |
26 | /* |
27 | * fs/fs-writeback.c | |
28 | */ | |
29 | enum writeback_sync_modes { | |
30 | WB_SYNC_NONE, /* Don't wait on anything */ | |
31 | WB_SYNC_ALL, /* Wait on every mapping */ | |
32 | WB_SYNC_HOLD, /* Hold the inode on sb_dirty for sys_sync() */ | |
33 | }; | |
34 | ||
35 | /* | |
36 | * A control structure which tells the writeback code what to do. These are | |
37 | * always on the stack, and hence need no locking. They are always initialised | |
38 | * in a manner such that unspecified fields are set to zero. | |
39 | */ | |
40 | struct writeback_control { | |
41 | struct backing_dev_info *bdi; /* If !NULL, only write back this | |
42 | queue */ | |
43 | enum writeback_sync_modes sync_mode; | |
44 | unsigned long *older_than_this; /* If !NULL, only write back inodes | |
45 | older than this */ | |
46 | long nr_to_write; /* Write this many pages, and decrement | |
47 | this for each page written */ | |
48 | long pages_skipped; /* Pages which were not written */ | |
49 | ||
50 | /* | |
51 | * For a_ops->writepages(): is start or end are non-zero then this is | |
52 | * a hint that the filesystem need only write out the pages inside that | |
53 | * byterange. The byte at `end' is included in the writeout request. | |
54 | */ | |
111ebb6e OH |
55 | loff_t range_start; |
56 | loff_t range_end; | |
1da177e4 | 57 | |
22905f77 AM |
58 | unsigned nonblocking:1; /* Don't get stuck on request queues */ |
59 | unsigned encountered_congestion:1; /* An output: a queue is full */ | |
60 | unsigned for_kupdate:1; /* A kupdate writeback */ | |
61 | unsigned for_reclaim:1; /* Invoked from the page allocator */ | |
62 | unsigned for_writepages:1; /* This is a writepages() call */ | |
111ebb6e | 63 | unsigned range_cyclic:1; /* range_start is cyclic */ |
c63c7b05 TM |
64 | |
65 | void *fs_private; /* For use by ->writepages() */ | |
1da177e4 LT |
66 | }; |
67 | ||
1da177e4 LT |
68 | /* |
69 | * fs/fs-writeback.c | |
70 | */ | |
71 | void writeback_inodes(struct writeback_control *wbc); | |
72 | void wake_up_inode(struct inode *inode); | |
73 | int inode_wait(void *); | |
74 | void sync_inodes_sb(struct super_block *, int wait); | |
75 | void sync_inodes(int wait); | |
76 | ||
77 | /* writeback.h requires fs.h; it, too, is not included from here. */ | |
78 | static 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 | } | |
84 | ||
85 | /* | |
86 | * mm/page-writeback.c | |
87 | */ | |
687a21ce | 88 | int wakeup_pdflush(long nr_pages); |
1da177e4 LT |
89 | void laptop_io_completion(void); |
90 | void laptop_sync_completion(void); | |
232ea4d6 | 91 | void throttle_vm_writeout(gfp_t gfp_mask); |
1da177e4 LT |
92 | |
93 | /* These are exported to sysctl. */ | |
94 | extern int dirty_background_ratio; | |
95 | extern int vm_dirty_ratio; | |
f6ef9438 BS |
96 | extern int dirty_writeback_interval; |
97 | extern int dirty_expire_interval; | |
1da177e4 LT |
98 | extern int block_dump; |
99 | extern int laptop_mode; | |
100 | ||
101 | struct ctl_table; | |
102 | struct file; | |
103 | int dirty_writeback_centisecs_handler(struct ctl_table *, int, struct file *, | |
104 | void __user *, size_t *, loff_t *); | |
105 | ||
106 | void page_writeback_init(void); | |
fa5a734e AM |
107 | void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, |
108 | unsigned long nr_pages_dirtied); | |
109 | ||
110 | static inline void | |
111 | balance_dirty_pages_ratelimited(struct address_space *mapping) | |
112 | { | |
113 | balance_dirty_pages_ratelimited_nr(mapping, 1); | |
114 | } | |
115 | ||
0ea97180 MS |
116 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, |
117 | void *data); | |
118 | ||
1da177e4 | 119 | int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0); |
0ea97180 MS |
120 | int generic_writepages(struct address_space *mapping, |
121 | struct writeback_control *wbc); | |
122 | int write_cache_pages(struct address_space *mapping, | |
123 | struct writeback_control *wbc, writepage_t writepage, | |
124 | void *data); | |
1da177e4 LT |
125 | int do_writepages(struct address_space *mapping, struct writeback_control *wbc); |
126 | int sync_page_range(struct inode *inode, struct address_space *mapping, | |
268fc16e OH |
127 | loff_t pos, loff_t count); |
128 | int sync_page_range_nolock(struct inode *inode, struct address_space *mapping, | |
129 | loff_t pos, loff_t count); | |
a200ee18 | 130 | void set_page_dirty_balance(struct page *page, int page_mkwrite); |
2d1d43f6 | 131 | void writeback_set_ratelimit(void); |
1da177e4 LT |
132 | |
133 | /* pdflush.c */ | |
134 | extern int nr_pdflush_threads; /* Global so it can be exported to sysctl | |
135 | read-only. */ | |
136 | ||
137 | ||
138 | #endif /* WRITEBACK_H */ |