A UFS file system has a fixed number of inodes, set when the file system is
created. df can simply report how many of those have been used, and how many
are free.
Most file systems, including ZFS and QFS, allocate inodes dynamically. In this
case, there really isn’t a “number of files free”
Thanks for Anton, Robert and Mark's replies. Your answer verified my
observation, ;-) .
The reason that I want to use up the inode is we need to test the
behaviors in the case of both block and inode are used up. If only fill
up the block, creating an empty file still succeeds.
Thanks,
