Re: [PATCH 1/3] NFSD: pass an integer for stable type to nfsd_vfs_write

[Kinglong Mee <kinglongmee@gmail.com>]

On 12/23/2016 17:25, Christoph Hellwig wrote:
> On Fri, Dec 23, 2016 at 05:18:03PM +0800, Kinglong Mee wrote:
>> We can check it in check_export() when exporting filesystem,
>> but, what can we do for the unsupported fsync filesystem?
>> Just a warning message? or deny the exporting? 
>> I'd prefer the first one.
> 
> Warn and refuse the writable export.
> 

I'd like warn and covert the export to read-only straightly.

For example, 
A test directory may be mounted many underlay filesystem (contain
 ISO9660, f2fs, etc) frequently. If refuse the writeable export, 
for ISO9660 the exports entry must be *(ro,...), but for f2fs
may be *(rw,...). I don't think someone wants change it every time.

thanks,
Kinglong Mee