* Linus Torvalds <[email protected]> wrote:
> The reason it goes through a pipe is two-fold:
>
> - the pipe _is_ the buffer. The reason sendfile() sucks is that sendfile
> cannot work with <n> different buffer representations. sendfile() only
> works with _one_ buffer representation, namely the "page cache of the
> file".
The main problem of sendfile() is that it exposes an incoming-fd
'offset', which pretty much hardcodes the assumption that the incoming
file is a pagecache-backed object. I believe the flush_fd solution to
sys_splice() would solve that range of problems, and thus slice could be
used for offset-less file objects too.
all the remaining problems of sendfile() just derive from this basic
pagecache assumption that is hardcoded in the ABI. Once this one is
overcome (and i believe fd_flush overcomes it), there's no reason why we
couldnt implement the complete range of sys_splice() transfers.
Ingo
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