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From: Ritesh Harjani <ritesh.list@gmail.com>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: jack@suse.cz, darrick.wong@oracle.com, linux-nvdimm@lists.01.org,
	david@fromorbit.com, linux-kernel@vger.kernel.org,
	linux-xfs@vger.kernel.org, ocfs2-devel@oss.oracle.com,
	viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
	dan.j.williams@intel.com, linux-btrfs@vger.kernel.org
Subject: Re: [Ocfs2-devel] [PATCH v3 06/10] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero
Date: Thu, 1 Apr 2021 12:15:06 +0530	[thread overview]
Message-ID: <20210401064506.47pz6u2gegp6s2ky@riteshh-domain> (raw)
In-Reply-To: <20210319015237.993880-7-ruansy.fnst@fujitsu.com>

On 21/03/19 09:52AM, Shiyang Ruan wrote:
> Punch hole on a reflinked file needs dax_copy_edge() too.  Otherwise,
> data in not aligned area will be not correct.  So, add the srcmap to
> dax_iomap_zero() and replace memset() as dax_copy_edge().
>
> Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
> ---
>  fs/dax.c               | 9 +++++++--
>  fs/iomap/buffered-io.c | 2 +-
>  include/linux/dax.h    | 3 ++-
>  3 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index cfe513eb111e..348297b38f76 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1174,7 +1174,8 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,
>  }
>  #endif /* CONFIG_FS_DAX_PMD */
>
> -s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
> +s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap,
> +		struct iomap *srcmap)

Do we know why does dax_iomap_zero() operates on PAGE_SIZE range?
IIUC, dax_zero_page_range() can take nr_pages as a parameter. But we still
always use one page at a time. Why is that?

>  {
>  	sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
>  	pgoff_t pgoff;
> @@ -1204,7 +1205,11 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
>  	}
>
>  	if (!page_aligned) {
> -		memset(kaddr + offset, 0, size);
> +		if (iomap->addr != srcmap->addr)
> +			dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap,
> +					   kaddr, true);
> +		else
> +			memset(kaddr + offset, 0, size);
>  		dax_flush(iomap->dax_dev, kaddr + offset, size);
>  	}
>  	dax_read_unlock(id);
>

Maybe the above could be simplified to this?

	if (page_aligned) {
		rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1);
	} else {
		rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL);
		if (iomap->addr != srcmap->addr)
			dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap,
					   kaddr, true);
		else
			memset(kaddr + offset, 0, size);
		dax_flush(iomap->dax_dev, kaddr + offset, size);
	}

	dax_read_unlock(id);
	return rc < 0 ? rc : size;

Other than that looks good.
Feel free to add.
Reviewed-by: Ritesh Harjani <ritesh.list@gmail.com>



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  reply	other threads:[~2021-04-12 15:23 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-19  1:52 [Ocfs2-devel] [PATCH v3 00/10] fsdax, xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 01/10] fsdax: Factor helpers to simplify dax fault code Shiyang Ruan
2021-03-23 15:33   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 02/10] fsdax: Factor helper: dax_fault_actor() Shiyang Ruan
2021-03-23 15:48   ` Ritesh Harjani
2021-03-31  3:57     ` ruansy.fnst
2021-04-02  7:47   ` Christoph Hellwig
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 03/10] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-03-23 15:54   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 04/10] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-03-23 16:08   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 05/10] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-04-01  6:39   ` Ritesh Harjani
2021-04-01  7:03     ` ruansy.fnst
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 06/10] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-04-01  6:45   ` Ritesh Harjani [this message]
2021-04-01  7:00     ` ruansy.fnst
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 07/10] iomap: Introduce iomap_apply2() for operations on two files Shiyang Ruan
2021-04-01  7:12   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 08/10] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-04-01 11:11   ` Ritesh Harjani
2021-04-08  3:21     ` ruansy.fnst
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 09/10] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 10/10] fs/xfs: Add dedupe support for fsdax Shiyang Ruan
2021-03-23 15:27 ` [Ocfs2-devel] [PATCH v3 00/10] fsdax, xfs: Add reflink&dedupe " Ritesh Harjani
2021-04-02  7:49 ` Christoph Hellwig
2021-04-02  8:18   ` ruansy.fnst

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