On Thu, 29 Dec 2005, cai wrote:
> > I am not sure I am following you. Shouldn't do_mpage_readpage work for
> > all adjacent blocks regardless of whether block size is page-aligned
> > or not? What's is the performance problem you're thinking of?
>
> no, not block size but cluster size
> as you know, in FAT, file is organized in clusters
> and one cluster could have N blocks(sectors).
> so if cluster size is not page-aligned,
> a page may live in non-adjacent blocks, and
> do_mpage_readpage has to fall back to block_read_full_page
> in this case.
But the non-page-aligned clusters can be adjacent on disk, no? Besides, I
don't think there's enough overhead in do_mpage_readpage for the
non-adjacent case to justify keeping the non-mpage version around.
Pekka
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