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From: Doug Barton <dougb@FreeBSD.org>
Date: Thu, 22 May 2003 11:38:54 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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Subject: cvs commit: src/sbin/newfs mkfs.c
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dougb       2003/05/22 11:38:54 PDT

  FreeBSD src repository

  Modified files:
    sbin/newfs           mkfs.c 
  Log:
  When newfs'ing a partition with UFS2 that had previously been newfs'ed
  with UFS1, the UFS1 superblocks were not deleted. This allowed any
  RELENG_4 (or other non-UFS2-aware) fsck to think it knew how to "fix"
  the file system, resulting in severe data scrambling.
  
  This patch is a more advanced version than the one originally submitted.
  Lukas improved it based on feedback from Kirk, and testing by me. It
  blanks all UFS1 superblocks (if any) during a UFS2 newfs, thereby causing
  fsck's that are not UFS2 aware to generate the "SEARCH FOR ALTERNATE
  SUPER-BLOCK FAILED" message, and exit without damaging the fs.
  
  PR:             bin/51619
  Submitted by:   Lukas Ertl <l.ertl@univie.ac.at>
  Reviewed by:    kirk
  Approved by:    re (scottl)
  
  Revision  Changes    Path
  1.77      +24 -0     src/sbin/newfs/mkfs.c