From owner-cvs-all  Mon Jan 29  0:19:50 2001
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Mon, 29 Jan 2001 00:19:28 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/miscfs/specfs spec_vnops.c
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dillon      2001/01/29 00:19:28 PST

  Modified files:
    sys/miscfs/specfs    spec_vnops.c 
  Log:
  This patch reestablishes the spec_fsync() guarentee that synchronous
  fsyncs, which typically occur during unmounting, will drain all dirty
  buffers even if it takes multiple passes to do so.  The guarentee was
  mangled by the last patch which solved a problem due to -current disabling
  interrupts while holding giant (which caused an infinite spin loop waiting for
  I/O to complete).  -stable does not have either patch, but has a similar
  bug in the original spec_fsync() code which is triggered by a bug in the
  softupdates umount code, a fix for which will be committed to -current
  as soon as Kirk stamps it.  Then both solutions will be MFC'd to -stable.
  
  -stable currently suffers from a combination of the softupdates bug and
  a small window of opportunity in the original spec_fsync() code, and -stable
  also suffers from the spin-loop bug but since interrupts are enabled the
  spin resolves itself in a few milliseconds.
  
  Revision  Changes    Path
  1.149     +17 -8     src/sys/miscfs/specfs/spec_vnops.c



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