Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls

[Andreas Dilger]

On 2010-07-08, at 06:21, Neil Brown wrote:
> On Thu, 08 Jul 2010 16:10:09 +0530
> "Aneesh Kumar K. V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> wrote:
>> How about adding mnt_id to the handle ? Documentation file says it is unique 
>> 
>> (1) mount ID:  unique identifier of the mount (may be reused after umount)

But this value is not persistent across a reboot, or even an umount/mount so it is not useful as an identifier.

I suppose one way to resolve this issue is to just allow the underlying filesystem to supply a completely opaque filehandle to userspace.  For local filesystems that don't care about persistence or uniqueness between nodes they can use something like mount_id, and for distributed/clustered filesystems they can include a globally-unique identifier.

Cheers, Andreas





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