linux-kernel - Re: [PATCH v8 06/10] iomap: fix iomap_dio

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Date: Tue, 2 Jul 2024 17:10:14 +0000
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Christoph Hellwig <hch@....de>, david@...morbit.com,
	chandan.babu@...cle.com, djwong@...nel.org, brauner@...nel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	yang@...amperecomputing.com, linux-mm@...ck.org,
	john.g.garry@...cle.com, linux-fsdevel@...r.kernel.org,
	hare@...e.de, p.raghav@...sung.com, mcgrof@...nel.org,
	gost.dev@...sung.com, cl@...amperecomputing.com,
	linux-xfs@...r.kernel.org, Zi Yan <zi.yan@...t.com>
Subject: Re: [PATCH v8 06/10] iomap: fix iomap_dio_zero() for fs bs > system
 page size

On Tue, Jul 02, 2024 at 05:51:54PM +0100, Matthew Wilcox wrote:
> On Tue, Jul 02, 2024 at 04:13:29PM +0000, Pankaj Raghav (Samsung) wrote:
> > On Tue, Jul 02, 2024 at 05:42:16PM +0200, Christoph Hellwig wrote:
> > > On Tue, Jul 02, 2024 at 02:01:23PM +0000, Pankaj Raghav (Samsung) wrote:
> > > +static int iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio,
> > > >                 loff_t pos, unsigned len)
> > > >  {
> > > >         struct inode *inode = file_inode(dio->iocb->ki_filp);
> > > >         struct bio *bio;
> > > >  
> > > > +       if (!len)
> > > > +               return 0;
> > > >         /*
> > > >          * Max block size supported is 64k
> > > >          */
> > > > -       WARN_ON_ONCE(len > ZERO_PAGE_64K_SIZE);
> > > > +       if (len > ZERO_PAGE_64K_SIZE)
> > > > +               return -EINVAL;
> > > 
> > > The should probably be both WARN_ON_ONCE in addition to the error
> > > return (and ZERO_PAGE_64K_SIZE really needs to go away..)
> > 
> > Yes, I will rename it to ZERO_PAGE_SZ_64K as you suggested.
> 
> No.  It needs a symbolic name that doesn't include the actual size.
> Maybe ZERO_PAGE_IO_MAX.  Christoph suggested using SZ_64K to define
> it, not to include it in the name.

Initially I kept the name as ZERO_FSB_PAGE as it is used to do sub-block
zeroing. But I know John from Oracle is already working on using it for
rt extent zeroing. So I will just go with ZERO_PAGE_IO_MAX for now.
Understood about the SZ_64K part. Thanks for the clarification.