From owner-cvs-all  Mon Apr 16 22:37:58 2001
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From: Kirk McKusick <mckusick@FreeBSD.org>
Date: Mon, 16 Apr 2001 22:37:52 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern vfs_bio.c src/sys/ufs/ffs ffs_vfsops.c
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mckusick    2001/04/16 22:37:52 PDT

  Modified files:
    sys/kern             vfs_bio.c 
    sys/ufs/ffs          ffs_vfsops.c 
  Log:
  Add debugging option to always read/write cylinder groups as full
  sized blocks. To enable this option, use: `sysctl -w debug.bigcgs=1'.
  Add debugging option to disable background writes of cylinder
  groups. To enable this option, use: `sysctl -w debug.dobkgrdwrite=0'.
  These debugging options should be tried on systems that are panicing
  with corrupted cylinder group maps to see if it makes the problem
  go away. The set of panics in question are:
  
  	ffs_clusteralloc: map mismatch
  	ffs_nodealloccg: map corrupted
  	ffs_nodealloccg: block not in map
  	ffs_alloccg: map corrupted
  	ffs_alloccg: block not in map
  	ffs_alloccgblk: cyl groups corrupted
  	ffs_alloccgblk: can't find blk in cyl
  	ffs_checkblk: partially free fragment
  
  The following panics are less likely to be related to this problem,
  but might be helped by these debugging options:
  
  	ffs_valloc: dup alloc
  	ffs_blkfree: freeing free block
  	ffs_blkfree: freeing free frag
  	ffs_vfree: freeing free inode
  
  If you try these options, please report whether they helped reduce your
  bitmap corruption panics to Kirk McKusick at <mckusick@mckusick.com>
  and to Matt Dillon <dillon@earth.backplane.com>.
  
  Revision  Changes    Path
  1.274     +6 -2      src/sys/kern/vfs_bio.c
  1.146     +14 -1     src/sys/ufs/ffs/ffs_vfsops.c


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