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From: Miklos Szeredi <miklos@szeredi.hu>
Date: Tue, 8 May 2018 16:57:04 +0200
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Subject: Re: [PATCH v2 15/35] ovl: add ovl_fsync()
To: Amir Goldstein <amir73il@gmail.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>,
        overlayfs <linux-unionfs@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Tue, May 8, 2018 at 7:14 AM, Amir Goldstein <amir73il@gmail.com> wrote:
> On Mon, May 7, 2018 at 11:37 AM, Miklos Szeredi <mszeredi@redhat.com> wrote:
>> Implement stacked fsync().
>>
>> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
>> ---
>>  fs/overlayfs/file.c | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
>> index a7af56861aa5..419aa3f9967b 100644
>> --- a/fs/overlayfs/file.c
>> +++ b/fs/overlayfs/file.c
>> @@ -233,10 +233,30 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
>>         return ret;
>>  }
>>
>> +static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync)
>> +{
>> +       struct fd real;
>> +       const struct cred *old_cred;
>> +       int ret;
>> +
>
> Don't sync non-upper. same as ovl_dir_fsync()

Ah, that was about EROFS returned by lower fsync, right?

Thanks,
Miklos