On Wed, Jun 10, 2015 at 3:40 PM, Christoph Hellwig <[email protected]> wrote: > On Tue, Jun 09, 2015 at 09:49:25PM +0800, Ming Lei wrote: >> This patches provides two approaches for enabling direct IO >> from user space: >> >> - userspace(such as losetup) can pass 'file' which is >> opened/fcntl as O_DIRECT >> - sysfs file is provided to run dio tests easily > > I really don't think two interfaces are a good idea here. The interface > for loop has always been that userspaces passes a FD and we use it, > so let's keep it that way.
That makes sense. > > And while we're at it please also send a patch for losetup so that we > can actually use the feature. I have wrote 2 patches to enable direct-io for backing file in util-linux, and they can be found in below tree: http://kernel.ubuntu.com/git/ming/util-linux.git/log/?h=losetup-dio I will post them in util-linux mail list later. thanks Ming -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
