Messages in this thread | | | Subject | Re: [PATCH -V14 0/11] Generic name to handle and open by handle syscalls | From | Andreas Dilger <> | Date | Fri, 9 Jul 2010 12:42:42 -0600 |
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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@linux.vnet.ibm.com> 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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