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TOMOYO Linux Cross Reference
Linux/include/linux/writeback.h

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  1 /*
  2  * include/linux/writeback.h
  3  */
  4 #ifndef WRITEBACK_H
  5 #define WRITEBACK_H
  6 
  7 #include <linux/sched.h>
  8 #include <linux/fs.h>
  9 
 10 DECLARE_PER_CPU(int, dirty_throttle_leaks);
 11 
 12 /*
 13  * The 1/4 region under the global dirty thresh is for smooth dirty throttling:
 14  *
 15  *      (thresh - thresh/DIRTY_FULL_SCOPE, thresh)
 16  *
 17  * Further beyond, all dirtier tasks will enter a loop waiting (possibly long
 18  * time) for the dirty pages to drop, unless written enough pages.
 19  *
 20  * The global dirty threshold is normally equal to the global dirty limit,
 21  * except when the system suddenly allocates a lot of anonymous memory and
 22  * knocks down the global dirty threshold quickly, in which case the global
 23  * dirty limit will follow down slowly to prevent livelocking all dirtier tasks.
 24  */
 25 #define DIRTY_SCOPE             8
 26 #define DIRTY_FULL_SCOPE        (DIRTY_SCOPE / 2)
 27 
 28 struct backing_dev_info;
 29 
 30 /*
 31  * fs/fs-writeback.c
 32  */
 33 enum writeback_sync_modes {
 34         WB_SYNC_NONE,   /* Don't wait on anything */
 35         WB_SYNC_ALL,    /* Wait on every mapping */
 36 };
 37 
 38 /*
 39  * why some writeback work was initiated
 40  */
 41 enum wb_reason {
 42         WB_REASON_BACKGROUND,
 43         WB_REASON_TRY_TO_FREE_PAGES,
 44         WB_REASON_SYNC,
 45         WB_REASON_PERIODIC,
 46         WB_REASON_LAPTOP_TIMER,
 47         WB_REASON_FREE_MORE_MEM,
 48         WB_REASON_FS_FREE_SPACE,
 49         WB_REASON_FORKER_THREAD,
 50 
 51         WB_REASON_MAX,
 52 };
 53 extern const char *wb_reason_name[];
 54 
 55 /*
 56  * A control structure which tells the writeback code what to do.  These are
 57  * always on the stack, and hence need no locking.  They are always initialised
 58  * in a manner such that unspecified fields are set to zero.
 59  */
 60 struct writeback_control {
 61         long nr_to_write;               /* Write this many pages, and decrement
 62                                            this for each page written */
 63         long pages_skipped;             /* Pages which were not written */
 64 
 65         /*
 66          * For a_ops->writepages(): if start or end are non-zero then this is
 67          * a hint that the filesystem need only write out the pages inside that
 68          * byterange.  The byte at `end' is included in the writeout request.
 69          */
 70         loff_t range_start;
 71         loff_t range_end;
 72 
 73         enum writeback_sync_modes sync_mode;
 74 
 75         unsigned for_kupdate:1;         /* A kupdate writeback */
 76         unsigned for_background:1;      /* A background writeback */
 77         unsigned tagged_writepages:1;   /* tag-and-write to avoid livelock */
 78         unsigned for_reclaim:1;         /* Invoked from the page allocator */
 79         unsigned range_cyclic:1;        /* range_start is cyclic */
 80 };
 81 
 82 /*
 83  * fs/fs-writeback.c
 84  */     
 85 struct bdi_writeback;
 86 int inode_wait(void *);
 87 void writeback_inodes_sb(struct super_block *, enum wb_reason reason);
 88 void writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
 89                                                         enum wb_reason reason);
 90 int writeback_inodes_sb_if_idle(struct super_block *, enum wb_reason reason);
 91 int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr,
 92                                                         enum wb_reason reason);
 93 void sync_inodes_sb(struct super_block *);
 94 long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
 95                                 enum wb_reason reason);
 96 long wb_do_writeback(struct bdi_writeback *wb, int force_wait);
 97 void wakeup_flusher_threads(long nr_pages, enum wb_reason reason);
 98 void inode_wait_for_writeback(struct inode *inode);
 99 
100 /* writeback.h requires fs.h; it, too, is not included from here. */
101 static inline void wait_on_inode(struct inode *inode)
102 {
103         might_sleep();
104         wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE);
105 }
106 
107 
108 /*
109  * mm/page-writeback.c
110  */
111 #ifdef CONFIG_BLOCK
112 void laptop_io_completion(struct backing_dev_info *info);
113 void laptop_sync_completion(void);
114 void laptop_mode_sync(struct work_struct *work);
115 void laptop_mode_timer_fn(unsigned long data);
116 #else
117 static inline void laptop_sync_completion(void) { }
118 #endif
119 void throttle_vm_writeout(gfp_t gfp_mask);
120 bool zone_dirty_ok(struct zone *zone);
121 
122 extern unsigned long global_dirty_limit;
123 
124 /* These are exported to sysctl. */
125 extern int dirty_background_ratio;
126 extern unsigned long dirty_background_bytes;
127 extern int vm_dirty_ratio;
128 extern unsigned long vm_dirty_bytes;
129 extern unsigned int dirty_writeback_interval;
130 extern unsigned int dirty_expire_interval;
131 extern int vm_highmem_is_dirtyable;
132 extern int block_dump;
133 extern int laptop_mode;
134 
135 extern int dirty_background_ratio_handler(struct ctl_table *table, int write,
136                 void __user *buffer, size_t *lenp,
137                 loff_t *ppos);
138 extern int dirty_background_bytes_handler(struct ctl_table *table, int write,
139                 void __user *buffer, size_t *lenp,
140                 loff_t *ppos);
141 extern int dirty_ratio_handler(struct ctl_table *table, int write,
142                 void __user *buffer, size_t *lenp,
143                 loff_t *ppos);
144 extern int dirty_bytes_handler(struct ctl_table *table, int write,
145                 void __user *buffer, size_t *lenp,
146                 loff_t *ppos);
147 
148 struct ctl_table;
149 int dirty_writeback_centisecs_handler(struct ctl_table *, int,
150                                       void __user *, size_t *, loff_t *);
151 
152 void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
153 unsigned long bdi_dirty_limit(struct backing_dev_info *bdi,
154                                unsigned long dirty);
155 
156 void __bdi_update_bandwidth(struct backing_dev_info *bdi,
157                             unsigned long thresh,
158                             unsigned long bg_thresh,
159                             unsigned long dirty,
160                             unsigned long bdi_thresh,
161                             unsigned long bdi_dirty,
162                             unsigned long start_time);
163 
164 void page_writeback_init(void);
165 void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
166                                         unsigned long nr_pages_dirtied);
167 
168 static inline void
169 balance_dirty_pages_ratelimited(struct address_space *mapping)
170 {
171         balance_dirty_pages_ratelimited_nr(mapping, 1);
172 }
173 
174 typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc,
175                                 void *data);
176 
177 int generic_writepages(struct address_space *mapping,
178                        struct writeback_control *wbc);
179 void tag_pages_for_writeback(struct address_space *mapping,
180                              pgoff_t start, pgoff_t end);
181 int write_cache_pages(struct address_space *mapping,
182                       struct writeback_control *wbc, writepage_t writepage,
183                       void *data);
184 int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
185 void set_page_dirty_balance(struct page *page, int page_mkwrite);
186 void writeback_set_ratelimit(void);
187 void tag_pages_for_writeback(struct address_space *mapping,
188                              pgoff_t start, pgoff_t end);
189 
190 void account_page_redirty(struct page *page);
191 
192 /* pdflush.c */
193 extern int nr_pdflush_threads;  /* Global so it can be exported to sysctl
194                                    read-only. */
195 
196 
197 #endif          /* WRITEBACK_H */
198 

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