Commit 0ff21646 authored Feb 23, 2016 by Yunlei He Committed by Jaegeuk Kim Feb 23, 2016

f2fs: avoid hungtask problem caused by losing wake_up



The D state of wait_on_all_pages_writeback should be waken by
function f2fs_write_end_io when all writeback pages have been
succesfully written to device. It's possible that wake_up comes
between get_pages and io_schedule. Maybe in this case it will
lost wake_up and still in D state even if all pages have been
write back to device, and finally, the whole system will be into
the hungtask state.

                if (!get_pages(sbi, F2FS_WRITEBACK))
                         break;
					<---------  wake_up
                io_schedule();

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Biao He <hebiao6@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 7a9d7548

fs/f2fs/checkpoint.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -920,7 +920,7 @@ static void wait_on_all_pages_writeback(struct f2fs_sb_info *sbi)
		if (!get_pages(sbi, F2FS_WRITEBACK))
		break;

		io_schedule();
		io_schedule_timeout(5*HZ);
		}
		finish_wait(&sbi->cp_wait, &wait);
		}