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From:   Olga Kornievskaia <olga.kornievskaia@gmail.com>
Date:   Thu, 2 Jan 2020 17:08:48 -0500
Message-ID: <CAN-5tyEpr1rz1V1fVZKXLz=9uOOaDrEyUrzTHUEJ+6EfmAPZ1A@mail.gmail.com>
Subject: Re: [PATCH v2 1/1] NFSv4.1 fix incorrect return value in copy_file_range
To:     Trond Myklebust <trond.myklebust@hammerspace.com>,
        Anna Schumaker <anna.schumaker@netapp.com>
Cc:     linux-nfs <linux-nfs@vger.kernel.org>
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Apologizes please ignore this was trying to submit v2 of the ACL patch
and sent the wrong file.

On Thu, Jan 2, 2020 at 4:28 PM Olga Kornievskaia
<olga.kornievskaia@gmail.com> wrote:
>
> From: Olga Kornievskaia <kolga@netapp.com>
>
> According to the NFSv4.2 spec if the input and output file is the
> same file, operation should fail with EINVAL. However, linux
> copy_file_range() system call has no such restrictions. Therefore,
> in such case let's return EOPNOTSUPP and allow VFS to fallback
> to doing do_splice_direct(). Also when copy_file_range is called
> on an NFSv4.0 or 4.1 mount (ie., a server that doesn't support
> COPY functionality), we also need to return EOPNOTSUPP and
> fallback to a regular copy.
>
> Fixes xfstest generic/075, generic/091, generic/112, generic/263
> for all NFSv4.x versions.
>
> Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
> ---
>  fs/nfs/nfs42proc.c | 3 ---
>  fs/nfs/nfs4file.c  | 4 +++-
>  2 files changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
> index ff6f85f..5196bfa 100644
> --- a/fs/nfs/nfs42proc.c
> +++ b/fs/nfs/nfs42proc.c
> @@ -329,9 +329,6 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
>         };
>         ssize_t err, err2;
>
> -       if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
> -               return -EOPNOTSUPP;
> -
>         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
>         if (IS_ERR(src_lock))
>                 return PTR_ERR(src_lock);
> diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
> index 45b2322..00d1719 100644
> --- a/fs/nfs/nfs4file.c
> +++ b/fs/nfs/nfs4file.c
> @@ -133,8 +133,10 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
>                                     struct file *file_out, loff_t pos_out,
>                                     size_t count, unsigned int flags)
>  {
> +       if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
> +               return -EOPNOTSUPP;
>         if (file_inode(file_in) == file_inode(file_out))
> -               return -EINVAL;
> +               return -EOPNOTSUPP;
>         return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
>  }
>
> --
> 1.8.3.1
>