I have just checked in changes to yaffs_fs.c, yaffs_guts.c, yaffs_guts.h to 
fix this problem.

Now yaffs Objects in the object look up hash table are not freed until the 
coresponding inode is cleared.

I did some tests with a smaller bucket size (8) and observed that the 
recycling problem does not happen.  Object numbers are now only recycled when 
the Linux cache tells us it is OK.

This mechanism does not use any new kernel calls and should thus be good with 
older kernels.

Thanx to Michael for his efforts in hunting down the problem.

-- Charles