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Commit bcddc3f0 authored by Jens Axboe's avatar Jens Axboe
Browse files

writeback: inline allocation failure handling in bdi_alloc_queue_work() 



This gets rid of work == NULL in bdi_queue_work() and puts the
OOM handling where it belongs.

Acked-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent cfc4ba53

fs/fs-writeback.c

+27 −22
Original line number Original line Diff line number Diff line
@@ -149,7 +149,6 @@ static void wb_clear_pending(struct bdi_writeback *wb, struct bdi_work *work) 




static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work)

static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work)

{

{

	if (work) {

	work->seen = bdi->wb_mask;

	work->seen = bdi->wb_mask;

	BUG_ON(!work->seen);

	BUG_ON(!work->seen);

	atomic_set(&work->pending, bdi->wb_cnt);

	atomic_set(&work->pending, bdi->wb_cnt);
@@ -163,7 +162,6 @@ static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work) 
	spin_lock(&bdi->wb_lock);

	spin_lock(&bdi->wb_lock);

	list_add_tail_rcu(&work->list, &bdi->work_list);

	list_add_tail_rcu(&work->list, &bdi->work_list);

	spin_unlock(&bdi->wb_lock);

	spin_unlock(&bdi->wb_lock);

	}





	/*

	/*

	 * If the default thread isn't there, make sure we add it. When

	 * If the default thread isn't there, make sure we add it. When
@@ -175,14 +173,12 @@ static void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work) 
		struct bdi_writeback *wb = &bdi->wb;

		struct bdi_writeback *wb = &bdi->wb;





		/*

		/*

		 * If we failed allocating the bdi work item, wake up the wb

		 * End work now if this wb has no dirty IO pending. Otherwise

		 * thread always. As a safety precaution, it'll flush out

		 * wakeup the handling thread

		 * everything

		 */

		 */

		if (!wb_has_dirty_io(wb)) {

		if (!wb_has_dirty_io(wb))

			if (work)

			wb_clear_pending(wb, work);

			wb_clear_pending(wb, work);

		} else if (wb->task)

		else if (wb->task)

			wake_up_process(wb->task);

			wake_up_process(wb->task);

	}

	}

}

}
@@ -202,11 +198,20 @@ static void bdi_alloc_queue_work(struct backing_dev_info *bdi, 
{

{

	struct bdi_work *work;

	struct bdi_work *work;





	/*

	 * This is WB_SYNC_NONE writeback, so if allocation fails just

	 * wakeup the thread for old dirty data writeback

	 */

	work = kmalloc(sizeof(*work), GFP_ATOMIC);

	work = kmalloc(sizeof(*work), GFP_ATOMIC);

	if (work)

	if (work) {

		bdi_work_init(work, wbc);

		bdi_work_init(work, wbc);



		bdi_queue_work(bdi, work);

		bdi_queue_work(bdi, work);

	} else {

		struct bdi_writeback *wb = &bdi->wb;



		if (wb->task)

			wake_up_process(wb->task);

	}

}

}





void bdi_start_writeback(struct writeback_control *wbc)

void bdi_start_writeback(struct writeback_control *wbc)