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Date:   Wed, 6 Jun 2018 13:37:02 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-xfs@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        cluster-devel <cluster-devel@...hat.com>,
        linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/6] iomap: move bdev and dax_dev in a union

On 6 June 2018 at 12:40, Christoph Hellwig <hch@....de> wrote:
> We always either ask for a block device or DAX device mapping, so we can
> use the same space for both.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/ext2/inode.c       | 6 ++++--
>  fs/ext4/inode.c       | 6 ++++--
>  fs/xfs/xfs_iomap.c    | 6 ++++--
>  include/linux/iomap.h | 6 ++++--
>  4 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 71635909df3b..8aead4e9dbc1 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -815,9 +815,11 @@ static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
>                 return ret;
>
>         iomap->flags = 0;
> -       iomap->bdev = inode->i_sb->s_bdev;
>         iomap->offset = (u64)first_block << blkbits;
> -       iomap->dax_dev = sbi->s_daxdev;
> +       if (IS_DAX(inode))
> +               iomap->dax_dev = sbi->s_daxdev;
> +       else
> +               iomap->bdev = inode->i_sb->s_bdev;
>
>         if (ret == 0) {
>                 iomap->type = IOMAP_HOLE;
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 2ea07efbe016..79027e99118f 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3524,8 +3524,10 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
>         iomap->flags = 0;
>         if (ext4_inode_datasync_dirty(inode))
>                 iomap->flags |= IOMAP_F_DIRTY;
> -       iomap->bdev = inode->i_sb->s_bdev;
> -       iomap->dax_dev = sbi->s_daxdev;
> +       if (IS_DAX(inode))
> +               iomap->dax_dev = sbi->s_daxdev;
> +       else
> +               iomap->bdev = inode->i_sb->s_bdev;
>         iomap->offset = (u64)first_block << blkbits;
>         iomap->length = (u64)map.m_len << blkbits;
>
> diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> index c6ce6f9335b6..587110db1ad2 100644
> --- a/fs/xfs/xfs_iomap.c
> +++ b/fs/xfs/xfs_iomap.c
> @@ -70,8 +70,10 @@ xfs_bmbt_to_iomap(
>         }
>         iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
>         iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
> -       iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
> -       iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
> +       if (IS_DAX(VFS_I(ip)))
> +               iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
> +       else
> +               iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));

This seems backwards.

>  }
>
>  xfs_extlen_t
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index a044a824da85..212f4d59bcbf 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -53,8 +53,10 @@ struct iomap {
>         u64                     length; /* length of mapping, bytes */
>         u16                     type;   /* type of mapping */
>         u16                     flags;  /* flags for mapping */
> -       struct block_device     *bdev;  /* block device for I/O */
> -       struct dax_device       *dax_dev; /* dax_dev for dax operations */
> +       union {
> +               struct block_device *bdev;
> +               struct dax_device   *dax_dev;
> +       };
>  };
>
>  /*
> --
> 2.14.2
>

Andreas

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