Date: Sat, 19 May 2012 18:50:16 +0200 From: =?iso-8859-1?Q?Edgar_Fu=DF?= <ef@math.uni-bonn.de> To: freebsd-fs@freebsd.org Subject: Book on FFS Message-ID: <C800B0B5-A86F-4977-832D-E08E643B5E15@math.uni-bonn.de>
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Is there a book (or other documentation) about FFS giving more details = than the 4.4BSD bible? I'm writing a Perl script that takes a subset of newfs's arguments, = reads a find -ls output and computes the fragmentation/bookkeeping = overhead for that particular data set. (The intent is to find out how = much the newfs parameters actually matter in terms of overhead for that = given data set.) In the course of researching what the exact overhead for the free list, = inodes and CG heads is, I learned (from discussions on NetBSD's = tech-kern list and from reading ufs/ffs/fs.h and mkfs.c) various = "interesting" things like files that need indirect blocks not being = allocated fragments, "number of blocks" and "number of data blocks" = (i.e. fs_size and fs_dsize) being in units of fragments, not blocks. I = suspect there is way more for me to learn in this field.=
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