#define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
struct bdi_writeback {
- struct list_head list; /* hangs off the bdi */
-
- struct backing_dev_info *bdi; /* our parent bdi */
+ struct backing_dev_info *bdi; /* our parent bdi */
unsigned int nr;
- unsigned long last_old_flush; /* last old data flush */
+ unsigned long last_old_flush; /* last old data flush */
+ unsigned long last_active; /* last time bdi thread was active */
- struct task_struct *task; /* writeback task */
- struct list_head b_dirty; /* dirty inodes */
- struct list_head b_io; /* parked for writeback */
- struct list_head b_more_io; /* parked for more writeback */
+ struct task_struct *task; /* writeback thread */
+ struct timer_list wakeup_timer; /* used for delayed bdi thread wakeup */
+ struct list_head b_dirty; /* dirty inodes */
+ struct list_head b_io; /* parked for writeback */
+ struct list_head b_more_io; /* parked for more writeback */
};
struct backing_dev_info {
struct list_head bdi_list;
- struct rcu_head rcu_head;
unsigned long ra_pages; /* max readahead in PAGE_CACHE_SIZE units */
unsigned long state; /* Always use atomic bitops on this */
unsigned int capabilities; /* Device capabilities */
unsigned int max_ratio, max_prop_frac;
struct bdi_writeback wb; /* default writeback info for this bdi */
- spinlock_t wb_lock; /* protects update side of wb_list */
- struct list_head wb_list; /* the flusher threads hanging off this bdi */
- unsigned long wb_mask; /* bitmask of registered tasks */
- unsigned int wb_cnt; /* number of registered tasks */
+ spinlock_t wb_lock; /* protects work_list */
struct list_head work_list;
int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
void bdi_unregister(struct backing_dev_info *bdi);
int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
-void bdi_start_writeback(struct backing_dev_info *bdi, struct super_block *sb,
- long nr_pages, int sb_locked);
-int bdi_writeback_task(struct bdi_writeback *wb);
+void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
+void bdi_start_background_writeback(struct backing_dev_info *bdi);
+int bdi_writeback_thread(void *data);
int bdi_has_dirty_io(struct backing_dev_info *bdi);
void bdi_arm_supers_timer(void);
+void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi);
extern spinlock_t bdi_lock;
extern struct list_head bdi_list;