From owner-cvs-all  Mon Jan 15 10:31: 5 2001
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From: Ian Dowse <iedowse@FreeBSD.org>
Date: Mon, 15 Jan 2001 10:30:41 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sbin/dumpfs dumpfs.c src/sbin/fsck_ffs fsutil.c
         setup.c src/sbin/fsck_ifs fsutil.c setup.c src/sbin/newfs mkfs.c
         src/sys/ufs/ffs ffs_snapshot.c ffs_vfsops.c fs.h
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iedowse     2001/01/15 10:30:41 PST

  Modified files:
    sbin/dumpfs          dumpfs.c 
    sbin/fsck_ffs        fsutil.c setup.c 
    sbin/fsck_ifs        fsutil.c setup.c 
    sbin/newfs           mkfs.c 
    sys/ufs/ffs          ffs_snapshot.c ffs_vfsops.c fs.h 
  Log:
  The ffs superblock includes a 128-byte region for use by temporary
  in-core pointers to summary information. An array in this region
  (fs_csp) could overflow on filesystems with a very large number of
  cylinder groups (~16000 on i386 with 8k blocks). When this happens,
  other fields in the superblock get corrupted, and fsck refuses to
  check the filesystem.
  
  Solve this problem by replacing the fs_csp array in 'struct fs'
  with a single pointer, and add padding to keep the length of the
  128-byte region fixed. Update the kernel and userland utilities
  to use just this single pointer.
  
  With this change, the kernel no longer makes use of the superblock
  fields 'fs_csshift' and 'fs_csmask'. Add a comment to newfs/mkfs.c
  to indicate that these fields must be calculated for compatibility
  with older kernels.
  
  Reviewed by:	mckusick
  
  Revision  Changes    Path
  1.14      +3 -3      src/sbin/dumpfs/dumpfs.c
  1.3       +2 -2      src/sbin/fsck_ffs/fsutil.c
  1.19      +5 -4      src/sbin/fsck_ffs/setup.c
  1.3       +2 -2      src/sbin/fsck_ifs/fsutil.c
  1.20      +5 -4      src/sbin/fsck_ifs/setup.c
  1.33      +6 -1      src/sbin/newfs/mkfs.c
  1.9       +5 -2      src/sys/ufs/ffs/ffs_snapshot.c
  1.135     +17 -16    src/sys/ufs/ffs/ffs_vfsops.c
  1.17      +17 -19    src/sys/ufs/ffs/fs.h



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