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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@3959 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Vladislav Bolkhovitin
2011-12-07 03:07:45 +00:00
parent 9ea7b8b4c9
commit 331cc5d28d
1 changed files with 0 additions and 19 deletions
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@@ -105,25 +105,6 @@
by pages, taken directly from dio->curr_user_address. Each such page should be referenced
by page_cache_get(). That's all.</p>
<A NAME="VDISK_REFACTOR"></A><h3>Refactoring of command execution path in scst_vdisk handler</h3>
<p>At the moment, in scst_vdisk handler command execution function vdisk_do_job() is
overcomplicated and not very performance effective. It would be good to replace all those
ugly "switch" statements by choosing the handler for each SCSI command by indirect
function call on an array of function pointers.</p>
<p>I.e., there should be an array vdisk_exec_fns with 256 entries of function pointers:</p>
<p>void (*cmd_exec_fn) (struct scst_cmd *cmd)</p>
<p>Then vdisk_do_job() should look like</p>
<p><code>static int vdisk_do_job(struct scst_cmd *cmd)<br>
{<br>
<span class="tab">return vdisk_exec_fns[cmd->cdb[0]](cmd);</span><br>
}
</code></p>
<A NAME="SG_LIMIT"></A><h3>Solve SG IO count limitation issue in pass-through mode</h3>
<p>In the pass-through mode (i.e. using the pass-through device handlers like