Re: [patch 0/3] make splice more generic

[Jamie Lokier]

Jens Axboe wrote:
> SPLICE_F_MOVE is a soft flag in that it will move if it
> can, but not fail if it can't.

According to local man page, it's not even that.

  SPLICE_F_MOVE      [...] The initial implementation of this flag  was  buggy:
		     therefore  starting  in  Linux  2.6.21 it is a *no-op*
		     (but is still permitted in a splice() call); in  the
		     future, a correct implementation may be restored.

> Perhaps we should add a flag that does pass back an error if we
> can't just move pages around, SPLICE_F_STRICT or something like
> that.

What should it do in cases where the kernel would choose to copy data,
i.e. data that isn't a whole page?

-- Jamie
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/