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Commit 595043e5 authored by Jens Axboe's avatar Jens Axboe
Browse files

writeback: provide a wakeup_flusher_threads_bdi() 



Similar to wakeup_flusher_threads(), except that we only wake
up the flusher threads on the specified backing device.

No functional changes in this patch.

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 47410d88

fs/fs-writeback.c

+29 −10
Original line number Diff line number Diff line
@@ -1946,6 +1946,33 @@ void wb_workfn(struct work_struct *work) 
	current->flags &= ~PF_SWAPWRITE;

}



/*

 * Start writeback of `nr_pages' pages on this bdi. If `nr_pages' is zero,

 * write back the whole world.

 */

static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,

					 long nr_pages, enum wb_reason reason)

{

	struct bdi_writeback *wb;



	if (!bdi_has_dirty_io(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);

}



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);

	rcu_read_unlock();

}



/*

 * Wakeup the flusher threads to start writeback of all currently dirty pages

 */
@@ -1963,16 +1990,8 @@ void wakeup_flusher_threads(enum wb_reason reason) 
	nr_pages = get_nr_dirty_pages();



	rcu_read_lock();

	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {

		struct bdi_writeback *wb;



		if (!bdi_has_dirty_io(bdi))

			continue;



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

			wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages),

						reason);

	}

	list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)

		__wakeup_flusher_threads_bdi(bdi, nr_pages, reason);

	rcu_read_unlock();

}

include/linux/writeback.h

+2 −0
Original line number Diff line number Diff line
@@ -190,6 +190,8 @@ bool try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr, 
				   enum wb_reason reason);

void sync_inodes_sb(struct super_block *);

void wakeup_flusher_threads(enum wb_reason reason);

void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,

				enum wb_reason reason);

void inode_wait_for_writeback(struct inode *inode);



/* writeback.h requires fs.h; it, too, is not included from here. */