fh_verify: no squashed_root access at session/lastsession (2.4.23 knfsd and Solaris 9)

fh_verify: no squashed_root access at session/lastsession (2.4.23 knfsd and Solaris 9)

[Vaclav Stepan]

Hello,

we ran in trouble while upgrading from 2.4.20pre1 to 2.4.23 kernel
on a GNU/Linux box which serves two Solaris 9 clients and one Linux
client.

When the export get set up and some mount attempt comes, the server
starts flooding the logs and screen with:

fh_verify: no root_squashed access at session/lastsession

(several messages per second). The server doesn't panic or crash --- I
am able to shut down knfsd without any harm --- everything works, just
the NFS drives are inaccessible.

There is a workaround using no_subtree_check as an option in the exports
file, but can anyone help me explain this? I found only two relevant
posts using Google with "fh_verify root_squashed" as keywords:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=110421
http://www.ussg.iu.edu/hypermail/linux/kernel/0309.1/1159.html

Thanks for your time

Vaclav Stepan
-- 
Vaclav Stepan
w@linux.fjfi.cvut.cz
http://linux.fjfi.cvut.cz/~w/


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