[RFC PATCH 08/14] pipe: Allow buffers to be marked read-whole-or-error for notifications [ver #2]

[David Howells]

Andy Lutomirski <luto at kernel.org> wrote:

> > Allow a buffer to be marked such that read() must return the entire buffer
> > in one go or return ENOBUFS.  Multiple buffers can be amalgamated into a
> > single read, but a short read will occur if the next "whole" buffer won't
> > fit.
> >
> > This is useful for watch queue notifications to make sure we don't split a
> > notification across multiple reads, especially given that we need to
> > fabricate an overrun record under some circumstances - and that isn't in
> > the buffers.
> 
> Hmm.  I'm not totally in love with introducing a new error code like
> this for read(), especially if it could affect the kind of pipe that
> is bound to a file in a filesystem.  But maybe it's not a problem.

EMSGSIZE might be better?

David