On Mon, Feb 13, 2017 at 08:45:59PM -0600, Goldwyn Rodrigues wrote: > From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx> > > Find out if the write will trigger a wait due to writeback. If yes, > return -EAGAIN. > > This introduces a new function filemap_range_has_page() which > returns true if the file's mapping has a page within the range > mentioned. > > Return -EINVAL for buffered AIO: there are multiple causes of > delay such as page locks, dirty throttling logic, page loading > from disk etc. which cannot be taken care of. I would prefer to add a flags argument to filemap_write_and_wait_range so that it will return -EAGAIN if it encounters a page instead of introducing a test before use race.
