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

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Message-ID: <20240702154216.GA1037@lst.de>
Date: Tue, 2 Jul 2024 17:42:16 +0200
From: Christoph Hellwig <hch@....de>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: Christoph Hellwig <hch@....de>, david@...morbit.com,
	willy@...radead.org, 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 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..)

> +                       ret = iomap_dio_zero(iter, dio, pos, fs_block_size - pad);

Overly lone line here.

Otherwise this looks good.