linux-ext4 - Re: [PATCH v2] mke2fs: fix coping of empty file using fiemap

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Date:   Tue, 17 Jan 2017 08:49:02 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Artem Blagodarenko <artem.blagodarenko@...gate.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2] mke2fs: fix coping of empty file using fiemap

On Tue, Jan 17, 2017 at 06:14:19PM +0300, Artem Blagodarenko wrote:
> Hello,
> 
> Darrick J. Wong, thank you for inspection. Here is second version of the patch.
> 
> Changes since v1:
> * errno is returned in case failed ioctl
> * loop is terminated any time fm_mapped_extents == 0
> 
> During filesystem creation with -d option files copied from given
> directory. If supported, FS_IOC_FIEMAP ioctl is used to get file
> extents. For empty file fm_mapped_extents is 0 and no error code
> is returned, because this is not fail situation.
> 
> Without this patch errno from previous operation is returned and
> successful FS_IOC_FIEMAP ioctl call for empty file is interpreted
> as error.
> 
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...gate.com>

Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  misc/create_inode.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/misc/create_inode.c b/misc/create_inode.c
> index 5122e56..d9e9b9b 100644
> --- a/misc/create_inode.c
> +++ b/misc/create_inode.c
> @@ -510,10 +510,12 @@ static errcode_t try_fiemap_copy(ext2_filsys fs,
> int fd, ext2_file_t e2_file,
>          if (err < 0 && (errno == EOPNOTSUPP || errno == ENOTTY)) {
>              err = EXT2_ET_UNIMPLEMENTED;
>              goto out;
> -        } else if (err < 0 || fiemap_buf->fm_mapped_extents == 0) {
> +        } else if (err < 0) {
>              err = errno;
>              goto out;
> -        }
> +        } else if (fiemap_buf->fm_mapped_extents == 0)
> +            goto out;
> +
>          for (i = 0, ext = ext_buf; i < fiemap_buf->fm_mapped_extents;
>               i++, ext++) {
>              err = copy_file_range(fs, fd, e2_file, ext->fe_logical,
> --
> --
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