Re: [NFS] some strangeness (at least) with linux-2.4.17-NFS_ALL patch

[Trond Myklebust]

>>>>> " " == Hans-Peter Jansen <[e-mail]> writes:
     >> What server is this?
     > Oups, sorry:
     > Linux shrek 2.4.13-ac7 #6 SMP Son Dez 2 20:02:04 CET 2001 i686 unknown
     > (on patches, IIRC)

And the knfsd server daemons (not the user-space 'unfsd')?

     > Shouldn't the client invalidate the dcache entry some time?
     > Now, 5 hours later, the dcache entry isn't invalidated, yet.

5 hours??? Unless you have set some crazy value for acdirmax, then it
should indeed have been revalidated under normal circumstances.

The default is for all attribute/dcache entries to time out at least
once every 60 seconds. That is what happens on my test setup at least.

     > I think, this is a thinko.

It shouldn't be. There might be a bug lingering somewhere, but
revalidation *is* normally supposed to occur.

Are you sure that you didn't mess up the fixups with 2.4.18-pre1? That
might explain things, since you would be messing with
nfs_refresh_inode. What you need to do against 2.4.18-pre1 is first to
revert the patch linux-2.4.17-fattr.dif. After that you should be able
to apply linux-2.4.17-NFS_ALL.dif directly without any rejections...

     > Please try this:

     > shrek is the server, elfe the client /raid is shared (reiserfs,
     > no raid), /tmp isn't

<snip>

     > Eingabe-/Ausgabefehler insgesamt 1 drwxr-xr-x 2 root root 55
     > 11. Jan 20:08 ./ drwxr-xr-x 9 root root 218 11. Jan 20:06 ../

     > Pretty simple. Can you reproduce this?

Nope. With /mnt/trondmy == NFS share, /tmp == local:

[trondmy@fyspc-epf03 gnurr]$ pwd
/mnt/trondmy/gnurr
[trondmy@fyspc-epf03 gnurr]$ touch /tmp/huhu
[trondmy@fyspc-epf03 gnurr]$ ln -s /tmp/huhu
[trondmy@fyspc-epf03 gnurr]$ ls -al
totalt 8
drwxr-xr-x    2 trondmy  trondmy      4096 jan 12 02:43 .
drwxr-xr-x   41 trondmy  trondmy      4096 jan 12 02:42 ..
lrwxrwxrwx    1 trondmy  trondmy         9 jan 12 02:43 huhu ->
/tmp/huhu
[trondmy@fyspc-epf03 gnurr]$ echo "huhu" > /tmp/huhu
[trondmy@fyspc-epf03 gnurr]$ ls -al
totalt 8
drwxr-xr-x    2 trondmy  trondmy      4096 jan 12 02:43 .
drwxr-xr-x   41 trondmy  trondmy      4096 jan 12 02:42 ..
lrwxrwxrwx    1 trondmy  trondmy         9 jan 12 02:43 huhu ->
/tmp/huhu
[trondmy@fyspc-epf03 gnurr]$ cat huhu
huhu
[trondmy@fyspc-epf03 gnurr]$ rm huhu
[trondmy@fyspc-epf03 gnurr]$ ls -al
totalt 8
drwxr-xr-x    2 trondmy  trondmy      4096 jan 12 02:44 .
drwxr-xr-x   41 trondmy  trondmy      4096 jan 12 02:42 ..
[trondmy@fyspc-epf03 gnurr]$ touch huhu
[trondmy@fyspc-epf03 gnurr]$ ls -al
totalt 8
drwxr-xr-x    2 trondmy  trondmy      4096 jan 12 02:44 .
drwxr-xr-x   41 trondmy  trondmy      4096 jan 12 02:42 ..
-rw-r--r--    1 trondmy  trondmy         0 jan 12 02:44 huhu

Cheers,
  Trond