NFS caching bug is back

[David Warren <warren@atmos.washington.edu>]

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A bug that we turned in a while ago is back in the 2.6.20 kernels, only 
worse. I have found it in 2.6.20.6 and 2.6.20.7. It happens with both 
NFS4 and NFS3 mounts. Clients don't see inode changes (delete and 
recreate file):
Setup:
3 systems all running:
Linux enkf1 2.6.20.7 #1 SMP Wed Apr 18 16:23:15 PDT 2007 x86_64 GNU/Linux
File system is xfs. mounted as:
/dev/sda3       /home/enkf      xfs     defaults        0       2
exported as:
(fsid=0,nohide,rw,no_subtree_check,sync,no_root_squash)
NFS mounted as
enkf1:/ /home/enkf   nfs4   rw,proto=tcp,rsize=32768,wsize=32768,hard  0 0
also as
enkf1:/ /home/enkf   nfs   rw,proto=tcp,rsize=8192,wsize=8192,hard  0 0
and
enkf1:/ /home/enkf   nfs   rw,proto=tcp,hard  0 0

Here are the mounts according to the mount command:
enkf1 -
/dev/sda3 on /home/enkf type xfs (rw)

enkf2 -
enkf1:/ on /home/enkf type nfs4 
(rw,proto=tcp,rsize=32768,wsize=32768,hard,addr=128.95.175.220)

enkf3 -
enkf1:/ on /home/enkf type nfs4 
(rw,proto=tcp,rsize=32768,wsize=32768,hard,addr=128.95.175.220)

Here is the sequence in time order. This is even easier to demonstrate 
than the last time:
enkf1:~# echo 2 > /home/enkf/ddd

enkf2:~# cat /home/enkf/ddd
2

enkf3:~# cat /home/enkf/ddd
2

enkf1:~# rm /home/enkf/ddd
enkf1:~# echo 3 > /home/enkf/ddd

enkf2:~# cat /home/enkf/ddd
2

enkf3:~# cat /home/enkf/ddd
2

enkf1:~# ls -i /home/enkf/ddd
10872 /home/enkf/ddd

enkf2:~# ls -i /home/enkf/ddd
10855 /home/enkf/ddd

enkf3:~# ls -i /home/enkf/ddd
10855 /home/enkf/ddd
enkf3:~# touch /home/enkf/ddd
enkf3:~# ls -i /home/enkf/ddd
10872 /home/enkf/ddd

enkf2:~# ls -i /home/enkf/ddd
10855 /home/enkf/ddd



-- 
David Warren 		INTERNET: warren@atmos.washington.edu
(206) 543-0945		Fax: (206) 543-0308
University of Washington
Dept of Atmospheric Sciences, Box 351640
Seattle, WA 98195-1640
-------------------------------------------------------------------------------
DECUS E-PUBS Library Committee representative
SeaLUG DECUS Chair


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