If you call sync, the initial call to wakeup_flusher_threads() ends up calling wb_start_writeback() with reason=WB_REASON_SYNC, but wb_start_writeback() always uses WB_SYNC_NONE as the writeback mode. Ensure that we use WB_SYNC_ALL for a sync operation.
Signed-off-by: Jens Axboe <[email protected]> --- fs/fs-writeback.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 5c46ed9f3e14..97a9e9987134 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -936,7 +936,10 @@ void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, return; } - work->sync_mode = WB_SYNC_NONE; + if (reason == WB_REASON_SYNC) + work->sync_mode = WB_SYNC_ALL; + else + work->sync_mode = WB_SYNC_NONE; work->nr_pages = nr_pages; work->range_cyclic = range_cyclic; work->reason = reason; -- 2.4.1.168.g1ea28e1
