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From: Kirk McKusick <mckusick@FreeBSD.org>
Date: Sat, 30 Nov 2002 11:00:51 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_lock.c src/sys/sys lockmgr.h
         src/sys/ufs/ffs ffs_snapshot.c
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mckusick    2002/11/30 11:00:51 PST

  Modified files:
    sys/kern             kern_lock.c 
    sys/sys              lockmgr.h 
    sys/ufs/ffs          ffs_snapshot.c 
  Log:
  Remove a race condition / deadlock from snapshots. When
  converting from individual vnode locks to the snapshot
  lock, be sure to pass any waiting processes along to the
  new lock as well. This transfer is done by a new function
  in the lock manager, transferlockers(from_lock, to_lock);
  Thanks to Lamont Granquist <lamont@scriptkiddie.org> for
  his help in pounding on snapshots beyond all reason and
  finding this deadlock.
  
  Sponsored by:   DARPA & NAI Labs.
  
  Revision  Changes    Path
  1.60      +37 -6     src/sys/kern/kern_lock.c
  1.35      +2 -0      src/sys/sys/lockmgr.h
  1.52      +112 -54   src/sys/ufs/ffs/ffs_snapshot.c

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