Re: rpc.mountd reads /etc/mtab 17028 times, 100% CPU.

[Sander Smeenk <ssmeenk@freshdot.net>]

Quoting Steve Dickson (SteveD@redhat.com):

> > This entire process of reading /etc/mtab 17028 times takes a lot of
> > time during which the client stalls, but in the end 'it just works
> > fine'. It just takes ages when you try to tab-complete on a client.
> Taking a quick look... it appears the only way rpc.mountd will read
> /etc/mtab is if the 'crossmnt' export flag is set. Is this the case?

Yes.

IIRC this was necessary for this situation:
Server has filesytems mounted on /mnt/pt1 and /mnt/pt1/foo.
Both /mnt/pt1 and /mnt/pt1/foo are exported with 'crossmnt'.
Clients that mount just /mnt/pt1 can also reach /mnt/pt1/foo.


> > Could someone point me to the code that is involved in doing this?
> utils/mountd/cache.c:nfsd_fh():path = next_mnt(&mnt, exp->m_export.e_path);

Thanks. I'll dig around some more and see what i can find.


-Sndr.
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