[Unionfs] [bug] missing directory entries on 2.6.21.7 + UnionFS 2.5 (on ppc405)

[Solomon Peachy]

We sometimes lose directory entries -- 'ls' or 'find' will not show 
every file present.  The interesting thing is that if we reference the file 
directly, it can be opened.  The missing files seem to share a common 
prefix with other files present, but that may be coincidental.

We were able to work around this problem by forcing a copyup of all 
directories -- by basically creating (then erasing) a file in each 
directory on the unionfs:

for x in `find / -type d |grep -v ^/sys |grep -v ^/proc |grep -v ^/dev `; \
   do touch $x/.unionfsfix ; rm $x/.unionfsfix ; done

After this, all directory entries are visible and the system operates 
fine.  

As I haven't been able to find any reference to this problem in the 
unionfs archives... any ideas?  

(I realize 2.6.21.7 is old, but rebasing to a newer kernel will take a 
 fair amount of work that we'd rather not underdake at the moment)

# mount                                                                         
rootfs on / type rootfs (rw)                                                    
/dev/root on / type squashfs (ro)                                               
tmpfs on /dev/shm type tmpfs (rw)                                               
/dev/root on /dev/shm/.rootfs type squashfs (ro)                                
/dev/mtdblock5 on /dev/shm/.featfs type squashfs (ro)                           
unionfs on / type unionfs 
(rw,dirs=/dev/shm/.overlay=rw:/dev/shm/.featfs=ro:/dev
/shm/.rootfs=ro)                                                                
tmpfs on /tmp type tmpfs (rw)                                                   
procdev on /proc type proc (rw)                                                 
ptsdev on /dev/pts type devpts (rw)                                             
/sys on /sys type sysfs (rw) 

 - Solomon
-- 
Solomon Peachy                        solomon at linux-wlan.com
AbsoluteValue Systems                 http://www.linux-wlan.com
721-D North Drive                     +1 (321) 259-0737  (office)
Melbourne, FL 32934                   +1 (321) 259-0286  (fax)
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