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Consider this /etc/fstab: # Device Mountpoint FStype Options Dump Pass# /dev/ad1s1b none swap sw 0 0 /dev/ad0s1b none swap sw 0 0 /dev/ad0s1a / ufs rw 1 1 /dev/ad0s1e /home ufs rw 2 2 /dev/ad1s1e /tmp ufs rw 2 2 /dev/ad1s1f /usr ufs rw 2 2 /dev/ccd0c /syv ufs rw 2 11 proc /proc procfs rw 0 0 ccd0c is striped over /dev/ad0f and /dev/ad1g Without this pass, fsck in preen mode will check ad0s1a first, and then issue three processes in parallel: One process doing ad0s1e One process doing ad1s1e and ad1s1f One process doing ccd0c There is no way to tell it that ccd0c overlaps ad0 and ad1. With the patch, it will do it this way: pass 2: One process doing ad0s1e One process doing ad1s1e and ad1s1f and when they are complete: pass 11: One process doing ccd0c This is much faster and more sane. Valid pass numbers are anything from 1 to INTMAX-1. I retired the '-l' option which tried to allow people to do something like this, but which didn't work and which complicated the code an awful lot.
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you have to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberosIV Kerberos package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/handbook/synching.html