Problem : ls a dir gives nothing

[IC20466]

After mounting the gmailfs, I have problem when doing the ls.

As shown below:

[me@/] mount /mnt/gmail_abc                 <<-- mount it
[me@/] cd /mnt/gmail_abc           
[me@/mnt/gmail_abc] ls -l                   <<-- give nothing
total 2
drwxr-xr-x  3 sam  sam     1 Jun 26 17:06 ./
drwxr-xr-x 13 root root 1024 Jun 22 15:57 ../
[me@/mnt/gmail_abc] cd sw                 <<--  but, it has <sw>
[me@/mnt/gmail_abc/sw] ls -l               <<-- still, nothing
total 1
drwxr-x--- 7 sam sam 1 Aug  9  2008 ./
drwxr-xr-x 3 sam sam 1 Jun 26 17:06 ../
[me@/mnt/gmail_abc/sw] mkdir dummy
mkdir: cannot create directory `dummy': Invalid argument
[me@/mnt/gmail_abc/sw] cd dummy
[me@/mnt/gmail_abc/sw/dummy]             <<-- the dir is there