On 2012-05-09, at 6:25 AM, Bernd Schubert wrote: > On 05/09/2012 02:05 PM, Christoph Hellwig wrote: >> On Wed, May 09, 2012 at 01:55:16PM +0200, Bernd Schubert wrote: >>> The basic idea of generation numbers is to check if an inode was >>> recycled, so only if the tuple of inode-number and generation-number >>> matches we still have the same file. Kernel nfs >> >> NFS does not and should not look at the inode generation. Except for a >> bit of legacy code for the old pre-Linux 2.4 filehandles it looks at the >> opaque file handle returned and only interpreted by the filesystem. Any >> userspace NFS server should do the same. > > Ok, I didn't look how kernel NFS does it for quite some time already... > User space NFS only can do it beginning with 2.6.39 - given that user space also needs to support older kernels and other OSs, which might not have open_by_handle, userspace unfortunately cannot entirely rely on that feature. But even fewer kernels have sys_statxat() in them (i.e. none), so you can rely on that even less than open_by_handle()... Cheers, Andreas -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
