Date: Mon, 8 Sep 2003 16:27:08 -0700 From: Alfred Perlstein <bright@mu.org> To: Eno Thereska <eno@andrew.cmu.edu> Cc: freebsd-fs@freebsd.org Subject: Re: free block bitmap Message-ID: <20030908232708.GE15671@elvis.mu.org> In-Reply-To: <3F5D0663.7020902@andrew.cmu.edu> References: <3F5D0663.7020902@andrew.cmu.edu>
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* Eno Thereska <eno@andrew.cmu.edu> [030908 15:45] wrote: > 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? afaik, cg by cg is how you'll have to do it. -- - Alfred Perlstein - Research Engineering Development Inc. - email: bright@mu.org cell: 408-480-4684
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