Re: (fwd) Re: [RFC] mount flag "direct"
Daniel Phillips (phillips@arcor.de)
Fri, 6 Sep 2002 19:33:55 +0200
On Friday 06 September 2002 19:20, Anton Altaparmakov wrote:
> As of very recently, Andrew Morton introduced an optimization to this with
> the get_blocks() interface in 2.5 kernels. Now the file system, when doing
> direct_IO at least, returns to the VFS the requested block position _and_
> the size of the block. So the VFS now gains in power in that it only needs
> to ask for each block once as it is now aware of the size of the block.
>
> But still, even with this optimization, the VFS still asks the FS for each
> block, and then the FS has to lookup each block.
Well, it takes no great imagination to see the progression: get_blocks
acts on extents instead of arrays of blocks. Expect to see that around
the 2.7 timeframe.
--
Daniel
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