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From:   Dan Williams <dan.j.williams@intel.com>
Date:   Wed, 27 Oct 2021 18:44:04 -0700
Message-ID: <CAPcyv4ht6fZOdx4YN9FRCnmD2Wy4zzG7nJPQSdSPAgvZNHxoFw@mail.gmail.com>
Subject: Re: [PATCH 11/11] dax: move bdev_dax_pgoff to fs/dax.c
To:     Christoph Hellwig <hch@lst.de>
Cc:     Mike Snitzer <snitzer@redhat.com>, Ira Weiny <ira.weiny@intel.com>,
        device-mapper development <dm-devel@redhat.com>,
        linux-xfs <linux-xfs@vger.kernel.org>,
        Linux NVDIMM <nvdimm@lists.linux.dev>,
        linux-s390 <linux-s390@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-erofs@lists.ozlabs.org,
        linux-ext4 <linux-ext4@vger.kernel.org>,
        virtualization@lists.linux-foundation.org
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On Sun, Oct 17, 2021 at 9:41 PM Christoph Hellwig <hch@lst.de> wrote:
>
> No functional changet, but this will allow for a tighter integration

s/changet/changes/

> with the iomap code, including possible passing the partition offset

s/possible/possibly/

> in the iomap in the future.  For now it mostly avoids growing more

s/now/now,/

...all of the above fixed up locally.

Other than that, it looks good to me.

> callers outside of fs/dax.c.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/dax/super.c | 14 --------------
>  fs/dax.c            | 13 +++++++++++++
>  include/linux/dax.h |  1 -
>  3 files changed, 13 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/dax/super.c b/drivers/dax/super.c
> index 803942586d1b6..c0910687fbcb2 100644
> --- a/drivers/dax/super.c
> +++ b/drivers/dax/super.c
> @@ -67,20 +67,6 @@ void dax_remove_host(struct gendisk *disk)
>  }
>  EXPORT_SYMBOL_GPL(dax_remove_host);
>
> -int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
> -               pgoff_t *pgoff)
> -{
> -       sector_t start_sect = bdev ? get_start_sect(bdev) : 0;
> -       phys_addr_t phys_off = (start_sect + sector) * 512;
> -
> -       if (pgoff)
> -               *pgoff = PHYS_PFN(phys_off);
> -       if (phys_off % PAGE_SIZE || size % PAGE_SIZE)
> -               return -EINVAL;
> -       return 0;
> -}
> -EXPORT_SYMBOL(bdev_dax_pgoff);
> -
>  /**
>   * dax_get_by_host() - temporary lookup mechanism for filesystem-dax
>   * @bdev: block device to find a dax_device for
> diff --git a/fs/dax.c b/fs/dax.c
> index 4e3e5a283a916..eb715363fd667 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -709,6 +709,19 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
>         return __dax_invalidate_entry(mapping, index, false);
>  }
>
> +static int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
> +               pgoff_t *pgoff)
> +{
> +       sector_t start_sect = bdev ? get_start_sect(bdev) : 0;
> +       phys_addr_t phys_off = (start_sect + sector) * 512;
> +
> +       if (pgoff)
> +               *pgoff = PHYS_PFN(phys_off);
> +       if (phys_off % PAGE_SIZE || size % PAGE_SIZE)
> +               return -EINVAL;
> +       return 0;
> +}
> +
>  static int copy_cow_page_dax(struct block_device *bdev, struct dax_device *dax_dev,
>                              sector_t sector, struct page *to, unsigned long vaddr)
>  {
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index 439c3c70e347b..324363b798ecd 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -107,7 +107,6 @@ static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
>  #endif
>
>  struct writeback_control;
> -int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
>  #if IS_ENABLED(CONFIG_FS_DAX)
>  int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk);
>  void dax_remove_host(struct gendisk *disk);
> --
> 2.30.2
>