/*
- * include/linux/writeback.h.
+ * include/linux/writeback.h
*/
#ifndef WRITEBACK_H
#define WRITEBACK_H
* Yes, writeback.h requires sched.h
* No, sched.h is not included from here.
*/
-static inline int current_is_pdflush(void)
+static inline int task_is_pdflush(struct task_struct *task)
{
- return current->flags & PF_FLUSHER;
+ return task->flags & PF_FLUSHER;
}
+#define current_is_pdflush() task_is_pdflush(current)
+
/*
* fs/fs-writeback.c
*/
};
/*
- * A control structure which tells the writeback code what to do
+ * 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 {
struct backing_dev_info *bdi; /* If !NULL, only write back this
long nr_to_write; /* Write this many pages, and decrement
this for each page written */
long pages_skipped; /* Pages which were not written */
- int nonblocking; /* Don't get stuck on request queues */
- int encountered_congestion; /* An output: a queue is full */
- int for_kupdate; /* A kupdate writeback */
- int for_reclaim; /* Invoked from the page allocator */
-};
-/*
- * ->writepage() return values (make these much larger than a pagesize, in
- * case some fs is returning number-of-bytes-written from writepage)
- */
-#define WRITEPAGE_ACTIVATE 0x80000 /* IO was not started: activate page */
+ /*
+ * 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.
+ */
+ loff_t range_start;
+ loff_t range_end;
+
+ unsigned nonblocking:1; /* Don't get stuck on request queues */
+ unsigned encountered_congestion:1; /* An output: a queue is full */
+ unsigned for_kupdate:1; /* A kupdate writeback */
+ unsigned for_reclaim:1; /* Invoked from the page allocator */
+ unsigned for_writepages:1; /* This is a writepages() call */
+ unsigned range_cyclic:1; /* range_start is cyclic */
+};
/*
* fs/fs-writeback.c
*/
void writeback_inodes(struct writeback_control *wbc);
void wake_up_inode(struct inode *inode);
-void __wait_on_inode(struct inode * inode);
+int inode_wait(void *);
void sync_inodes_sb(struct super_block *, int wait);
void sync_inodes(int wait);
/* writeback.h requires fs.h; it, too, is not included from here. */
static inline void wait_on_inode(struct inode *inode)
{
- if (inode->i_state & I_LOCK)
- __wait_on_inode(inode);
+ might_sleep();
+ wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,
+ TASK_UNINTERRUPTIBLE);
}
/*
* mm/page-writeback.c
*/
-int wakeup_bdflush(long nr_pages);
+int wakeup_pdflush(long nr_pages);
void laptop_io_completion(void);
void laptop_sync_completion(void);
+void throttle_vm_writeout(gfp_t gfp_mask);
/* These are exported to sysctl. */
extern int dirty_background_ratio;
extern int vm_dirty_ratio;
-extern int dirty_writeback_centisecs;
-extern int dirty_expire_centisecs;
+extern int dirty_writeback_interval;
+extern int dirty_expire_interval;
extern int block_dump;
extern int laptop_mode;
void __user *, size_t *, loff_t *);
void page_writeback_init(void);
-void balance_dirty_pages_ratelimited(struct address_space *mapping);
+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);
+}
+
int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
+extern int generic_writepages(struct address_space *mapping,
+ struct writeback_control *wbc);
int do_writepages(struct address_space *mapping, struct writeback_control *wbc);
+int sync_page_range(struct inode *inode, struct address_space *mapping,
+ loff_t pos, loff_t count);
+int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
+ loff_t pos, loff_t count);
+void set_page_dirty_balance(struct page *page);
+void writeback_set_ratelimit(void);
/* pdflush.c */
extern int nr_pdflush_threads; /* Global so it can be exported to sysctl