linux-kernel - Re: [PATCH v9 5/8] fsdax: Add dax_iomap_cow_copy() for dax_iomap

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Date:   Thu, 16 Sep 2021 08:16:54 +0200
From:   Christoph Hellwig <hch@....de>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     djwong@...nel.org, hch@....de, linux-xfs@...r.kernel.org,
        dan.j.williams@...el.com, david@...morbit.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        nvdimm@...ts.linux.dev, rgoldwyn@...e.de, viro@...iv.linux.org.uk,
        willy@...radead.org, Ritesh Harjani <riteshh@...ux.ibm.com>
Subject: Re: [PATCH v9 5/8] fsdax: Add dax_iomap_cow_copy() for
 dax_iomap_zero

On Wed, Sep 15, 2021 at 06:44:58PM +0800, Shiyang Ruan wrote:
> +	rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL);
> +	if (rc < 0)
> +		goto out;
> +	memset(kaddr + offset, 0, size);
> +	if (srcmap->addr != IOMAP_HOLE && srcmap->addr != iomap->addr) {

Should we also check that ->dax_dev for iomap and srcmap are different
first to deal with case of file system with multiple devices?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>