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From: Andriy Gapon <avg@FreeBSD.org>
Date: Sat, 3 Apr 2010 08:53:53 +0000 (UTC)
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Subject: cvs commit: src/sys/geom geom_vfs.c
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avg         2010-04-03 08:53:53 UTC

  FreeBSD src repository

  Modified files:
    sys/geom             geom_vfs.c 
  Log:
  SVN rev 206130 on 2010-04-03 08:53:53Z by avg
  
  g_vfs_open: allow only one mount per device vnode
  
  In other words, deny multiple read-only mounts of the same device.
  Shared read-only mounts should theoretically be possible, but,
  unfortunately, can not be implemented correctly using current
  buffer cache code/interface and results in an eventual system crash.
  Also, using nullfs seems to be a more efficient way to achieve the same
  goal.
  
  This gets us back to where we were before GEOM and where other BSDs are.
  
  Submitted by:   pjd (idea for checking for shared mounting)
  Discussed with: phk, pjd
  Silence from:   fs@, geom@
  MFC after:      2 weeks
  
  Revision  Changes    Path
  1.19      +6 -1      src/sys/geom/geom_vfs.c