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SubjectRe: NFS and cached atime
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Date
miquels@cistron.nl (Miquel van Smoorenburg) writes:

> I just noticed that even if I mount my NFS mailspool with noac, the
> atime stamp doesn't get updated when I read the file. This ofcourse
> is because the file is cached in memory, and NFS has no open/close.
> It happens on both 2.0.36 and 2.2.7
>
> Right now my "you have new mail" doesn't work, because even if I read
> my mail, the atime stamp doesn't get updated.
>
> Sounds like upon a read, the NFS client should update the atime on
> the server even if the file was cached. Ofcourse this shouldn't
> happen too often - perhaps acatimemin and acatimemax mount options
> should be considered? Or as a workaround only after the first read()
> on a freshly opened file?

This is all fairly easy to implement. I'd suggest just comparing the
cached value of atime with the current time, and updating it in
nfs_file_read if the discrepancy exceeds some timeout value.

Dunno about adding an extra mount option though: why not use the
ordinary attribute caching timeouts and keep things simple? IMHO mount
is already bloated with enough unnecessary NFS options.

What are people's feelings about this?

Cheers,
Trond

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