I have to confirm nfs bug reported by Leos Bitto and introduced in
2.2.14pre8 kernel.
I did many experimets and here is complete description.
nfs server - RHL 6.0
Linux ns2.ryston.cz 2.2.14pre6 #1 Fri Nov 19 18:39:48 CET 1999 i586 unknown
knfsd-1.2.2-4
knfsd-clients-1.2.2-4
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda1 795254 578689 175480 77% /
/dev/hda1 16247612 14669192 1578420 90% /ftproot
/dev/hdc1 36053416 20710984 15342432 57%
/ftproot/public/Mirror
GOOD nfs client - RHL 6.0
Linux ns3.ryston.cz 2.2.14pre7 #2 Sun Nov 21 15:28:50 CET 1999 i586 unknown
knfsd-clients-1.2.2-4
knfsd-1.2.2-4
both mount-2.9u and mount-2.10d
[root@ns2 /]# /etc/rc.d/init.d/nfs stop
[root@ns3 /]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1294732 377260 77% /
[root@ns2 /]# /etc/rc.d/init.d/nfs start
[root@ns3 /]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1294732 377260 77% /
ns2:/ftproot 16247612 14669192 1578420 90% /mnt/tmp
ns2:/ftproot/public/Mirror
36053416 20710984 15342432 57% /mnt/tmp/public/Mirror
[root@ns3 /]# umount /mnt/tmp/public/Mirror
[root@ns3 /]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1294732 377260 77% /
ns2:/ftproot 16247612 14669192 1578420 90% /mnt/tmp
[root@ns3 /]# umount /mnt/tmp/
[root@ns3 /]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1294732 377260 77% /
[root@ns3 /]#
[root@ns3 /]# mc
So far, with 2.2.14pre7 everything seems to be correct. But:
BAD nfs client:
Linux ns3.ryston.cz 2.2.14pre12 #2 Fri Dec 10 18:17:56 CET 1999 i586 unknown
[root@ns3 /root]# mount ns2:/ftproot /mnt/tmp
[root@ns3 /root]# mount ns2:/ftproot/public/Mirror /mnt/tmp/public/Mirror
[root@ns3 /root]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1303761 368231 78% /
ns2:/ftproot 16247612 14669192 1578420 90% /mnt/tmp
ns2:/ftproot/public/Mirror
36053416 20710984 15342432 57% /mnt/tmp/public/Mirror
[root@ns2 /]# /etc/rc.d/init.d/nfs stop
[root@ns3 /root]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1303762 368230 78% /
df: /mnt/tmp/public/Mirror: Connection refused
// the first differece..
[root@ns2 /]# /etc/rc.d/init.d/nfs start
[root@ns3 /root]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1303763 368229 78% /
ns2:/ftproot 16247612 14669192 1578420 90% /mnt/tmp
ns2:/ftproot/public/Mirror
16247612 14669192 1578420 90% /mnt/tmp/public/Mirror
// now you can se that /mnt/tmp/public/Mirror has wrong size
[root@ns3 /root]# umount /mnt/tmp/public/Mirror
umount: /mnt/tmp/public/Mirror: not mounted
// and cannot be unmountd
[root@ns3 /root]# mount
/dev/hda1 on / type ext2 (rw)
none on /proc type proc (rw)
none on /dev/pts type devpts (rw,mode=0622)
ns2:/ftproot on /mnt/tmp type nfs (rw,addr=194.24.231.12)
// it doesn't seem to be mounted, but
[root@ns3 /]# cat /proc/mounts
/dev/root / ext2 rw 0 0
/proc /proc proc rw 0 0
none /dev/pts devpts rw 0 0
ns2:/ftproot /mnt/tmp nfs rw,addr=ns2 0 0
ns2:/ftproot/public/Mirror /mnt/tmp/public/Mirror nfs rw,addr=ns2 0 0
// is seems it remained here? And again
[root@ns3 /root]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda1 1763113 1303763 368229 78% /
ns2:/ftproot 16247612 14669192 1578420 90% /mnt/tmp
[root@ns3 /root]# umount /mnt/tmp
umount: /mnt/tmp: device is busy
[root@ns3 /root]# cat /proc/mounts
/dev/root / ext2 rw 0 0
/proc /proc proc rw 0 0
none /dev/pts devpts rw 0 0
ns2:/ftproot /mnt/tmp nfs rw,addr=ns2 0 0
ns2:/ftproot/public/Mirror /mnt/tmp/public/Mirror nfs rw,addr=ns2 0 0
If you need more detail description please let me know.
Best Regards,
Petr Soucek
Ryston Electronics s.r.o.
tel +420-2-61302222 fax +420-2-61302211
Email: petr@ryston.cz http://www.ryston.cz
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