On Thu, 27 Jul 2006 08:15:27 +0100
Anton Altaparmakov <[email protected]> wrote:
> > I'm surprised ext2 is allocating with __GFP_FS set, though. Would that
> > cause any problem?
>
> That is an ext2 bug IMO.
There is no bug.
What there is is an ill-defined set of rules. If we want to tighten these
rules we have a choice between
a) Never enter page reclaim while holding i_mutex or
b) never take i_mutex on the page reclaim path.
Implementing a) would be a disaster. It means that our main write()
implementation in mm/filemap.c (which holds i_mutex) wouldn't be able to
reclaim pages to satisfy the write. And generally, we do want to use the
strongest memory allocation mode at all times.
So we'll have a better kernel if we implement b).
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