Date: Mon, 08 Sep 2003 18:44:51 -0400 From: Eno Thereska <eno@andrew.cmu.edu> To: freebsd-fs@freebsd.org Subject: free block bitmap Message-ID: <3F5D0663.7020902@andrew.cmu.edu>
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Hi, I am using FreeBSD4.4 with FFS as the underlying file system. I need to examine which blocks in the file system are currently in use. These blocks can be metadata or data blocks. I have looked at the FFS code and it seems the only way to get the list of free blocks (or busy blocks) is by querying each cylinder group's (cg) bitmap of free blocks. Is there a global bitmap that keeps track of busy/free blocks over the entire file system or is the only option the cg-by-cg lookup? Thanks a lot Eno
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