copy on write for splice() from file to pipe?

Jeremy Allison jra at
Fri Feb 10 18:19:36 UTC 2023

On Fri, Feb 10, 2023 at 09:57:20AM -0800, Andy Lutomirski via samba-technical wrote:
>(And if Samba needs to make sure that future writes don't change the
>outgoing data even two seconds later when the data has been sent but
>not acked, then maybe a fancy API could be added to help, or maybe
>Samba shouldn't be using zero copy IO in the first place!)

Samba doesn't need any of this. The simplest thing to do is
to restrict splice-based zero-copy IO to files leased by
a single client, where exclusive access to changes is controled
by the client redirector.

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