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Greetings,

We discovered something interesting today and I thought I would share it
with the list.  We noticed that doing a df from SL nodes on some of our
NFS served directories would return back bogus info (1 block available 0
~ used).  Meanwhile, the same df run on some of our older RH72 based
system returned sane values.  We've traced it down to the following code
in the kernel (see below).  In our case, the blocks were under the
overflow threshold but the number of files was not.  I will write a
patch to work around this for us.  I will share it with the list after
its done.

- --Shane

sample output from two hosts...

[root@pdsflx320 root]# df -h /auto/snfactry9
Filesystem            Size  Used Avail Use% Mounted on
pd0305.nersc.gov:/export/data2/snfactry
~                      1.1T  199G  960G  18% /auto/snfactry9

[root@pc1601 nfs]# df -h /auto/snfactry9
Filesystem            Size  Used Avail Use% Mounted on
pd0305.nersc.gov:/export/data2/snfactry
~                         1     1     1   0% /auto/snfactry9

from fs/nfs/incode.c in nfs_statfs

~       if (TOOBIG(((res.tbytes + blockres) >> blockbits)))
~                goto too_big;
~        if (TOOBIG(((res.fbytes + blockres) >> blockbits)))
~                goto too_big;
~        if (TOOBIG(((res.abytes + blockres) >> blockbits)))
~                goto too_big;
~        if (TOOBIG(res.tfiles) || TOOBIG(res.afiles))
~                goto too_big;

~        buf->f_blocks = (res.tbytes + blockres) >> blockbits;
~        buf->f_bfree = (res.fbytes + blockres) >> blockbits;
~        buf->f_bavail = (res.abytes + blockres) >> blockbits;
~        buf->f_files = res.tfiles;
~        buf->f_ffree = res.afiles;
~        return 0;

~ too_big:
~        dprintk("nfs_statfs: failed: EOVERFLOW\n");
~        buf->f_files = buf->f_ffree = -1;

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