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From: Jeff Roberson <jeff@FreeBSD.org>
Date: Tue, 4 Mar 2003 13:35:28 -0800 (PST)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern vfs_cluster.c
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jeff        2003/03/04 13:35:28 PST

  FreeBSD src repository

  Modified files:
    sys/kern             vfs_cluster.c 
  Log:
   - Hold the buf lock while manipulating and inspecting its fields.
   - Use gbincore() and not incore() so that we can drop the vnode interlock
     as we acquire the buflock.
   - Use GB_LOCK_NOWAIT when getting bufs for read ahead clusters so that we
     don't block on locked bufs.
   - Convert a while loop to a howmany() that will most likely be faster on
     modern processors.  There is another while loop divide that was left
     near by because it is operating on a 64bit int and is most likely faster.
   - Cleanup the cluster_read() code a little to get rid of a goto and make
     the logic clearer.
  
  Tested on:      x86, alpha
  Tested by:      Steve Kargl <sgk@troutmask.apl.washington.edu>
  Reviewd by:     arch
  
  Revision  Changes    Path
  1.131     +70 -56    src/sys/kern/vfs_cluster.c

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