Hi,
On Tue, Feb 06, 2001 at 07:25:19PM -0500, Ingo Molnar wrote:
>
> On Wed, 7 Feb 2001, Stephen C. Tweedie wrote:
>
> > No, it is a problem of the ll_rw_block interface: buffer_heads need to
> > be aligned on disk at a multiple of their buffer size. Under the Unix
> > raw IO interface it is perfectly legal to begin a 128kB IO at offset
> > 512 bytes into a device.
>
> then we should either fix this limitation, or the raw IO code should split
> the request up into several, variable-size bhs, so that the range is
> filled out optimally with aligned bhs.
That gets us from 512-byte blocks to 4k, but no more (ll_rw_block
enforces a single blocksize on all requests but that relaxing that
requirement is no big deal). Buffer_heads can't deal with data which
spans more than a page right now.
--Stephen
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Wed Feb 07 2001 - 21:00:25 EST