Greetings -

Whilst playing with getting quotas from NFS-mounted filestores I've
just discovered a slight problem with src/lib/mountpoint.c

I had things working on a Solaris 10 test machine which had the
mailstore mounted 'normally' using an entry in /etc/vfstab.

However when I changed to use the automounter for the mailstore
obtaining the quota broke.

The problem lies with mountpoint_get(). On a 'normally' mounted
filestore this obtains the device_path of the remote filestore in the
form

 remoteservername.some.domain:/remote/path

However when the mailstore was automounted I was instead getting back

 auto_direct

which is the name of the automounter map we're using.

The /etc/mnttab file has TWO entries for the auto-mounted filestore,
like this:

auto_direct /mailstore/messages/p autofs
direct,ignore,dev=4740014 1184648400 crypt2.york.ac.uk:/vol/vol9/p /mailstore/messages/p nfs
proto=tcp,xattr,dev=4700386 1184668792

Although there are two entries they have different device numbers.
The mountpoint_get() function attempts to guard against this by
checking the device number obtained matches that of the path being
located.

However for some reason I don't understand when getmntent() returns
the FIRST of the above two entries it supplies the device number of
the SECOND. Thus the device numbers match in the mountpoint_get()
test and it thinks it has found the correct entry. This leads to the
device_path being set to the map name -- auto_direct -- instead of
the host:/path

My fix is to add an additional fstype for the test to ignore:
"autofs". The loop skips over any such mounts (along with the
existing tests for "swap" and "ignore").

I'm attaching my minimal patch in case it's of help to anyone else.

(Timo: would it be possible to get this added into the distribution
code if you agree it's right?)

Cheers, Mike Brudenell

-- The Computing Service, University of York, Heslington, York Yo10 5DD, UK Tel:+44-1904-433811 FAX:+44-1904-433740

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