Re: [PATCH] Introduce sys_splice() system call

From: Jens Axboe
Date: Fri Mar 31 2006 - 02:30:17 EST


On Thu, Mar 30 2006, Andrew Morton wrote:
> Jens Axboe <axboe@xxxxxxx> wrote:
> >
> > > > + ret = write_one_page(page, 0);
> > >
> > > Still want to know why this is here??
> > >
> > > > +out:
> > > > + if (ret < 0)
> > > > + unlock_page(page);
> > >
> > > If write_one_page()'s call to ->writepage() failed, this will cause a
> > > double unlock.
> >
> > Can probably be improved - can I drop write_one_page() and just unlock
> > the page and regular cleaning will flush it out?
> >
>
> Of course - commit_write() will mark the page dirty and it'll get flushed
> back in the normal manner. We don't need that set_page_dirty() in there
> either.

Ok, wasn't sure about the fact if it always dirtied the page for me.
I'll test it and get rid of it.

> But we do need some O_SYNC/S_ISSYNC handling...

Hrmpf so that isn't handled automagically. Noted.

--
Jens Axboe

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