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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 8 Dec 2008 11:04:17 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/ufs/ufs ufs_quota.c
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kib         2008-12-08 11:04:17 UTC

  FreeBSD src repository

  Modified files:
    sys/ufs/ufs          ufs_quota.c 
  Log:
  SVN rev 185761 on 2008-12-08 11:04:17Z by kib
  
  The dqrele() function syncs the dq, then acquires the dqh lock, and then
  does final drop of the the dq reference to put it onto the free list.
  There is a possibility that the dq would be found by another thread
  after sync and before the dqh lock is acquired. If that other thread
  drops the dq before we have taken the dqh lock, the dirty dq is put on
  the free list.
  
  Recheck the DQ_MOD after the dqh lock is relocked. Repeat dqsync() if
  the dq is dirty. This ensures that up to date dq is written in the quota
  file and fixes assertion in dqget().
  
  Reported and tested by: Frode Nordahl <frode nordahl net>
  MFC after:      3 days
  
  Revision  Changes    Path
  1.100     +13 -1     src/sys/ufs/ufs/ufs_quota.c