On Tue, Feb 28, 2017 at 05:36:03PM -0600, Goldwyn Rodrigues wrote: > From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx> > > This flag informs kernel to bail out if an AIO request will block > for reasons such as file allocations, or a writeback triggered, > or would block while allocating requests while performing > direct I/O. > > IOCB_FLAG_NOWAIT is translated to IOCB_NOWAIT for > iocb->ki_flags. Given that we aren't validating aio_flags in older kernels we can't just add this flag as it will be a no-op in older kernels. I think we will have to add IOCB_CMD_PREADV2/IOCB_CMD_WRITEV2 opcodes that properly validate all reserved fields or flags first. Once we do that I'd really prefer to use the same flags values as preadv2/pwritev2 so that we'll only need one set of flags over sync/async read/write ops.
