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Commit e8e8a0c6 authored by Jens Axboe's avatar Jens Axboe
Browse files

writeback: move nr_pages == 0 logic to one location 



Now that we have no external callers of wb_start_writeback(), we
can shuffle the passing in of 'nr_pages'. Everybody passes in 0
at this point, so just kill the argument and move the dirty
count retrieval to that function.

Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Tested-by: default avatarChris Mason <clm@fb.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 9dfb176f

fs/fs-writeback.c

+17 −24
Original line number Diff line number Diff line
@@ -933,8 +933,18 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi, 


#endif	/* CONFIG_CGROUP_WRITEBACK */



static void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,

				enum wb_reason reason)

/*

 * Add in the number of potentially dirty inodes, because each inode

 * write can dirty pagecache in the underlying blockdev.

 */

static unsigned long get_nr_dirty_pages(void)

{

	return global_node_page_state(NR_FILE_DIRTY) +

		global_node_page_state(NR_UNSTABLE_NFS) +

		get_nr_dirty_inodes();

}



static void wb_start_writeback(struct bdi_writeback *wb, enum wb_reason reason)

{

	struct wb_writeback_work *work;
@@ -954,7 +964,7 @@ static void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, 
	}



	work->sync_mode	= WB_SYNC_NONE;

	work->nr_pages	= nr_pages;

	work->nr_pages	= wb_split_bdi_pages(wb, get_nr_dirty_pages());

	work->range_cyclic = 1;

	work->reason	= reason;

	work->auto_free	= 1;
@@ -1814,17 +1824,6 @@ static struct wb_writeback_work *get_next_work_item(struct bdi_writeback *wb) 
	return work;

}



/*

 * Add in the number of potentially dirty inodes, because each inode

 * write can dirty pagecache in the underlying blockdev.

 */

static unsigned long get_nr_dirty_pages(void)

{

	return global_node_page_state(NR_FILE_DIRTY) +

		global_node_page_state(NR_UNSTABLE_NFS) +

		get_nr_dirty_inodes();

}



static long wb_check_background_flush(struct bdi_writeback *wb)

{

	if (wb_over_bg_thresh(wb)) {
@@ -1951,7 +1950,7 @@ void wb_workfn(struct work_struct *work) 
 * write back the whole world.

 */

static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,

					 long nr_pages, enum wb_reason reason)

					 enum wb_reason reason)

{

	struct bdi_writeback *wb;
@@ -1959,17 +1958,14 @@ static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, 
		return;



	list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node)

		wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),

					reason);

		wb_start_writeback(wb, reason);

}



void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,

				enum wb_reason reason)

{

	long nr_pages = get_nr_dirty_pages();



	rcu_read_lock();

	__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);

	__wakeup_flusher_threads_bdi(bdi, reason);

	rcu_read_unlock();

}
@@ -1979,7 +1975,6 @@ void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, 
void wakeup_flusher_threads(enum wb_reason reason)

{

	struct backing_dev_info *bdi;

	long nr_pages;



	/*

	 * If we are expecting writeback progress we must submit plugged IO.
@@ -1987,11 +1982,9 @@ void wakeup_flusher_threads(enum wb_reason reason) 
	if (blk_needs_flush_plug(current))

		blk_schedule_flush_plug(current);



	nr_pages = get_nr_dirty_pages();



	rcu_read_lock();

	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)

		__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);

		__wakeup_flusher_threads_bdi(bdi, reason);

	rcu_read_unlock();

}