>> >With union mount and cowlink, there are two users already. cp(1)
>> >could use it as well, even if the improvement is quite minimal.
>>
>> FTP PUT could use this too - ...
>
>No, FTP PUT _cannot_ use it, exactly because sendfile() can't do anything
>but file sources (and not even all file sources - it can only do regular
>filesystems that use the page cache).
>
>This is why I want to get rid of sendfile(). It's a fundamentally broken
>interface. Really. In contrast, the pipe buffers _can_ be used for direct
>socket->file interfaces.
How will userspace access these pipe buffers?
Jan Engelhardt
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