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Add ols presentation

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<title>Buffer Cache</title>
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<a href="text0.htm">First page</a> <a href="text25.htm">Back</a> <a href="text27.htm">Continue</a> <a href="text32.htm">Last page</a> <a href="ols-xfs.htm">Summary</a> <a href="img26.htm">Graphics</a></center><br>
<h1><b>The Buffer Cache</b></h1><p>
<ul><li><h2><b>Linux defines I/O in terms of fixed size buffer heads</b></h2>
<li><h2><b>XFS has variable size metadata</b></h2>
<ul><li><b>512 bytes to 64 Kbytes</b>
</ul><li><h2><b>XFS transaction code needs control of write to disk sequence</b></h2>
<li><h2><b>Long term Linux goal of caching metadata in the page cache</b></h2>
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