Streams support in Linux

Steve French smfrench at
Tue Aug 28 18:32:39 UTC 2018

On Tue, Aug 28, 2018 at 1:12 PM Jeremy Allison <jra at> wrote:
> On Mon, Aug 27, 2018 at 08:07:35PM -0500, Steve French wrote:
> >
> > Given that streams need to be read to backup Macs and Windows
> > (and for a few features of these servers mentioned earlier)
> > and would be exposed in ntfs (and SMB3 remotely) locally on Linux,
> > seems useful to me to have some consistent way to open and read
> > them on Linux even if we don't want to generalize it to other local fs.
> > The protocol supports it fine (just a file with a reserved character
> > ':' in it) but a little tricky to avoid name conflict with posix ':'
> > in filenames
> This sounds like a case for a couple of ioctls. One to enumerate
> the streams on an open fd, one to open a given stream name on an
> open fd.

We already have a (cifs.ko) ioctl to enumerate streams, but I was
less comfortable with how to structure an ioctl to read/write a
stream (other than $DATA of course).  Ideas on what a "read stream"
ioctl might look like?



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