Messages in this thread | | | Date | Tue, 2 Sep 2008 17:02:20 -0400 | From | Christoph Hellwig <> | Subject | Re: [PATCH] UBIFS: fill f_fsid |
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On Tue, Sep 02, 2008 at 11:09:54AM -0600, Andreas Dilger wrote: > The fsid is supposed to be a persistent, unique identifier for the > filesystem, used by NFS in file handles. Using st_dev is unsafe, > because that may change from one server boot to the next, because > of device probing order, driver changes, etc. Also, not all filesystems > HAVE a valid st_dev in the first place, which is the whole reason > for this thread. > > I think a ->get_fsid() export method would be preferable.
Umm, different things. f_fsid in stat(v)fs is just a cookie exported to userspac that has never really been documented.
We also called the filesystem part of the NFS filehandle in a few places, and for those it's correct that it should be stable. Currently the fsid is either created from the dev_t in kernelspace or from uuids extracted through libuuid in userspace.
I can't see anything in the message that started this thread that mentions NFS, btw.
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