transport.c.htm

光驱cdrom读写源代码,scsi命令解析

<a class="l" name="48">     48 </a><a href="/source/s?defs=get_uscsi_cmd">get_uscsi_cmd</a>(<b>void</b>)
<a class="l" name="49">     49 </a>{
<a class="hl" name="50">     50 </a>	(<b>void</b>) <a href="/source/s?defs=memset">memset</a>(&amp;<a href="/source/s?defs=uscmd">uscmd</a>, <span class="n">0</span>, <b>sizeof</b> (<a href="/source/s?defs=uscmd">uscmd</a>));
<a class="l" name="51">     51 </a>	(<b>void</b>) <a href="/source/s?defs=memset">memset</a>(<a href="/source/s?defs=ucdb">ucdb</a>, <span class="n">0</span>, <span class="n">16</span>);
<a class="l" name="52">     52 </a>	<a href="/source/s?defs=uscmd">uscmd</a>.<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a> = <a href="/source/s?defs=ucdb">ucdb</a>;
<a class="l" name="53">     53 </a>	<b>return</b> (&amp;<a href="/source/s?defs=uscmd">uscmd</a>);
<a class="l" name="54">     54 </a>}
<a class="l" name="55">     55 </a>
<a class="l" name="56">     56 </a><b>int</b>
<a class="l" name="57">     57 </a><a href="/source/s?defs=uscsi">uscsi</a>(<b>int</b> <a href="/source/s?defs=fd">fd</a>, <b>struct</b> <a href="/source/s?defs=uscsi_cmd">uscsi_cmd</a> *<a href="/source/s?defs=scmd">scmd</a>)
<a class="l" name="58">     58 </a>{
<a class="l" name="59">     59 </a>	<b>int</b> <a href="/source/s?defs=ret">ret</a>, <a href="/source/s?defs=global_rqsense">global_rqsense</a>;
<a class="hl" name="60">     60 </a>	<b>int</b> <a href="/source/s?defs=retries">retries</a>, <a href="/source/s?defs=max_retries">max_retries</a>;
<a class="l" name="61">     61 </a>
<a class="l" name="62">     62 </a>	<span class="c">/* set up for request sense extensions */</span>
<a class="l" name="63">     63 </a>	<b>if</b> (!(<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_flags">uscsi_flags</a> &amp; <a href="/source/s?defs=USCSI_RQENABLE">USCSI_RQENABLE</a>)) {
<a class="l" name="64">     64 </a>		<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_flags">uscsi_flags</a> |= <a href="/source/s?defs=USCSI_RQENABLE">USCSI_RQENABLE</a>;
<a class="l" name="65">     65 </a>		<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_rqlen">uscsi_rqlen</a> = <a href="/source/s?defs=RQBUFLEN">RQBUFLEN</a>;
<a class="l" name="66">     66 </a>		<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_rqbuf">uscsi_rqbuf</a> = <a href="/source/s?defs=rqbuf">rqbuf</a>;
<a class="l" name="67">     67 </a>		<a href="/source/s?defs=global_rqsense">global_rqsense</a> = <span class="n">1</span>;
<a class="l" name="68">     68 </a>	} <b>else</b> {
<a class="l" name="69">     69 </a>		<a href="/source/s?defs=global_rqsense">global_rqsense</a> = <span class="n">0</span>;
<a class="hl" name="70">     70 </a>	}
<a class="l" name="71">     71 </a>
<a class="l" name="72">     72 </a>	<span class="c">/*
<a class="l" name="73">     73 </a>	 * Some DVD drives may have a delay for writing or sync cache, and
<a class="l" name="74">     74 </a>	 * read media info (done after syncing cache). This can take a
<a class="l" name="75">     75 </a>	 * significant number of time. Such as the Pioneer A0X which will
<a class="l" name="76">     76 </a>	 * generate TOC after the cache is full in the middle of writing.
<a class="l" name="77">     77 </a>	 */</span>
<a class="l" name="78">     78 </a>
<a class="l" name="79">     79 </a>	<b>if</b> ((<a href="/source/s?defs=device_type">device_type</a> != <a href="/source/s?defs=CD_RW">CD_RW</a>) &amp;&amp; ((<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=WRITE_10_CMD">WRITE_10_CMD</a>) ||
<a class="hl" name="80">     80 </a>	    (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=READ_INFO_CMD">READ_INFO_CMD</a>) || (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] ==
<a class="l" name="81">     81 </a>	    <a href="/source/s?defs=SYNC_CACHE_CMD">SYNC_CACHE_CMD</a>) || (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[<span class="n">0</span>] == <a href="/source/s?defs=CLOSE_TRACK_CMD">CLOSE_TRACK_CMD</a>))) {
<a class="l" name="82">     82 </a>
<a class="l" name="83">     83 </a>		<a href="/source/s?defs=max_retries">max_retries</a> = <span class="n">500</span>;
<a class="l" name="84">     84 </a>	} <b>else</b> {
<a class="l" name="85">     85 </a>		<span class="c">/*
<a class="l" name="86">     86 </a>		 * Pioneer <a href="/source/s?path=A08/">A08</a>/<a href="/source/s?path=A08/A09">A09</a> retries approx 30 times.
<a class="l" name="87">     87 </a>		 */</span>
<a class="l" name="88">     88 </a>		<a href="/source/s?defs=max_retries">max_retries</a> = <span class="n">40</span>;
<a class="l" name="89">     89 </a>	}
<a class="hl" name="90">     90 </a>
<a class="l" name="91">     91 </a>	<span class="c">/*
<a class="l" name="92">     92 </a>	 * The device may be busy or slow and fail with a not ready status.
<a class="l" name="93">     93 </a>	 * we'll allow a limited number of retries to give the drive time
<a class="l" name="94">     94 </a>	 * to recover.
<a class="l" name="95">     95 </a>	 */</span>
<a class="l" name="96">     96 </a>	<b>for</b> (<a href="/source/s?defs=retries">retries</a> = <span class="n">0</span>; <a href="/source/s?defs=retries">retries</a> &lt; <a href="/source/s?defs=max_retries">max_retries</a>; <a href="/source/s?defs=retries">retries</a>++) {
<a class="l" name="97">     97 </a>
<a class="l" name="98">     98 </a>		<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_status">uscsi_status</a> = <span class="n">0</span>;
<a class="l" name="99">     99 </a>
<a class="hl" name="100">    100 </a>		<b>if</b> (<a href="/source/s?defs=global_rqsense">global_rqsense</a>)
<a class="l" name="101">    101 </a>			(<b>void</b>) <a href="/source/s?defs=memset">memset</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>, <span class="n">0</span>, <a href="/source/s?defs=RQBUFLEN">RQBUFLEN</a>);
<a class="l" name="102">    102 </a>
<a class="l" name="103">    103 </a>		<b>if</b> (<a href="/source/s?defs=debug">debug</a> &amp;&amp; <a href="/source/s?defs=verbose">verbose</a>) {
<a class="l" name="104">    104 </a>			<b>int</b> i;
<a class="l" name="105">    105 </a>
<a class="l" name="106">    106 </a>			(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<span class="s">"cmd:["</span>);
<a class="l" name="107">    107 </a>			<b>for</b> (i = <span class="n">0</span>; i &lt; <a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdblen">uscsi_cdblen</a>; i++)
<a class="l" name="108">    108 </a>				(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<span class="s">"0x%02x "</span>,
<a class="l" name="109">    109 </a>				    (<a href="/source/s?defs=uchar_t">uchar_t</a>)<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_cdb">uscsi_cdb</a>[i]);
<a class="hl" name="110">    110 </a>			(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<span class="s">"]\n"</span>);
<a class="l" name="111">    111 </a>		}
<a class="l" name="112">    112 </a>
<a class="l" name="113">    113 </a>		<span class="c">/*
<a class="l" name="114">    114 </a>		 * We need to have root privledges in order to use
<a class="l" name="115">    115 </a>		 * uscsi commands on the device.
<a class="l" name="116">    116 </a>		 */</span>
<a class="l" name="117">    117 </a>
<a class="l" name="118">    118 </a>		<a href="/source/s?defs=raise_priv">raise_priv</a>();
<a class="l" name="119">    119 </a>		<a href="/source/s?defs=ret">ret</a> = <a href="/source/s?defs=ioctl">ioctl</a>(<a href="/source/s?defs=fd">fd</a>, <a href="/source/s?defs=USCSICMD">USCSICMD</a>, <a href="/source/s?defs=scmd">scmd</a>);
<a class="hl" name="120">    120 </a>		<a href="/source/s?defs=lower_priv">lower_priv</a>();
<a class="l" name="121">    121 </a>
<a class="l" name="122">    122 </a>		<span class="c">/* maintain consistency in case of sgen */</span>
<a class="l" name="123">    123 </a>		<b>if</b> ((<a href="/source/s?defs=ret">ret</a> == <span class="n">0</span>) &amp;&amp; (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_status">uscsi_status</a> == <span class="n">2</span>)) {
<a class="l" name="124">    124 </a>			<a href="/source/s?defs=ret">ret</a> = -<span class="n">1</span>;
<a class="l" name="125">    125 </a>			<a href="/source/s?defs=errno">errno</a> = <a href="/source/s?defs=EIO">EIO</a>;
<a class="l" name="126">    126 </a>		}
<a class="l" name="127">    127 </a>
<a class="l" name="128">    128 </a>		<span class="c">/* if error and extended request sense, retrieve errors */</span>
<a class="l" name="129">    129 </a>		<b>if</b> (<a href="/source/s?defs=global_rqsense">global_rqsense</a> &amp;&amp; (<a href="/source/s?defs=ret">ret</a> &lt; <span class="n">0</span>) &amp;&amp; (<a href="/source/s?defs=scmd">scmd</a>-&gt;<a href="/source/s?defs=uscsi_status">uscsi_status</a> == <span class="n">2</span>)) {
<a class="hl" name="130">    130 </a>			<span class="c">/*
<a class="l" name="131">    131 </a>			 * The drive is not ready to recieve commands but
<a class="l" name="132">    132 </a>			 * may be in the process of becoming ready.
<a class="l" name="133">    133 </a>			 * sleep for a short time then retry command.
<a class="l" name="134">    134 </a>			 * <a href="/source/s?path=SENSE/">SENSE</a>/<a href="/source/s?path=SENSE/ASC">ASC</a> = 2/4 : not ready
<a class="l" name="135">    135 </a>			 * ASCQ = 0  Not Reportable.
<a class="l" name="136">    136 </a>			 * ASCQ = 1  Becoming ready.
<a class="l" name="137">    137 </a>			 * ASCQ = 4  FORMAT in progress.
<a class="l" name="138">    138 </a>			 * ASCQ = 7  Operation in progress.
<a class="l" name="139">    139 </a>			 * ASCQ = 8  Long write in progress.
<a class="hl" name="140">    140 </a>			 */</span>
<a class="l" name="141">    141 </a>			<b>if</b> ((<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">2</span>) &amp;&amp; (<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">4</span>) &amp;&amp;
<a class="l" name="142">    142 </a>			    ((<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">0</span>) || (<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">1</span>) ||
<a class="l" name="143">    143 </a>			    (<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">4</span>)) || (<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">7</span>)) {
<a class="l" name="144">    144 </a>				<a href="/source/s?defs=total_retries">total_retries</a>++;
<a class="l" name="145">    145 </a>				(<b>void</b>) <a href="/source/s?defs=sleep">sleep</a>(<span class="n">3</span>);
<a class="l" name="146">    146 </a>				<b>continue</b>;
<a class="l" name="147">    147 </a>			}
<a class="l" name="148">    148 </a>
<a class="l" name="149">    149 </a>			<span class="c">/*
<a class="hl" name="150">    150 </a>			 * we do not print this out under normal circumstances
<a class="l" name="151">    151 </a>			 * since we have BUFE enabled and do not want to alarm
<a class="l" name="152">    152 </a>			 * users with uneccessary messages.
<a class="l" name="153">    153 </a>			 */</span>
<a class="l" name="154">    154 </a>			<b>if</b> (<a href="/source/s?defs=debug">debug</a>) {
<a class="l" name="155">    155 </a>				<b>if</b> ((<a href="/source/s?defs=SENSE_KEY">SENSE_KEY</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">5</span>) &amp;&amp; (<a href="/source/s?defs=ASC">ASC</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) ==
<a class="l" name="156">    156 </a>				    <span class="n">0x21</span>) &amp;&amp; (<a href="/source/s?defs=ASCQ">ASCQ</a>(<a href="/source/s?defs=rqbuf">rqbuf</a>) == <span class="n">2</span>)) {
<a class="l" name="157">    157 </a>					(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<a href="/source/s?defs=gettext">gettext</a>(
<a class="l" name="158">    158 </a>			<span class="s">"Buffer underrun occurred! trying to recover...\n"</span>));
<a class="l" name="159">    159 </a>				}
<a class="hl" name="160">    160 </a>			}
<a class="l" name="161">    161 </a>
<a class="l" name="162">    162 </a>			<span class="c">/*