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<H2><A NAME="s21">21.</A> <A HREF="SCSI-Programming-HOWTO.html#toc21">$B%(%i!<=hM}(B</A></H2>

<P>
<A NAME="sec-errorhandling"></A> 
$B4X?t(B <CODE>open</CODE>, <CODE>ioctl</CODE>, <CODE>write</CODE> $B$*$h$S(B <CODE>read</CODE> $B$O(B
$B%(%i!<$rJs9p$9$k2DG=@-$,$"$j$^$9!#$3$N>l9g!"4X?t$NJV$jCM$O(B -1 $B$G(B
$BBg0hJQ?t(B errno $B$K%(%i!<HV9f$,M?$($i$l$^$9!#(B
errno $B$NCM$O(B <CODE>/usr/include/errno.h</CODE> $B$K$*$$$FDj5A$5$l$F$$$^$9!#(B
$B0J2<$N$h$&$JCM$r$H$j$($^$9!'(B</P>

<P>
<BLOCKQUOTE><CODE>
<PRE>
$B4X?t(B     | $B%(%i!<(B       | $B2r@b(B
=========|==============|=============================================
open     | ENXIO        | $B%G%P%$%9$,L58z(B
         | EACCES       | $B%"%/%;%9%b!<%I$,(Bread/write(O_RDWR)$B$G$J$$(B 
         | EBUSY        | $B%G%P%$%9$KBP$7%V%m%C%/$7$J$$%"%/%;%9$,MW5a(B
         |              | $B$5$l$?$,!"8=:_$O%S%8!<>uBV!#(B
         | ERESTARTSYS  | $B$3$l$OFbIt$N%(%i!<$r<($9!#:F8=2DG=$K$7$F(B
         |              | SCSI $B%A%c%s%M%k$KJs$;$i$l$?$$(B($B%P%0Js9p$N>\:Y(B
         |              | $B$O(B Drew Eckhardts $B$K$h$k(B SCSI-HOWTO $B$r$_$h(B)
ioctl    | ENXIO        | $B%G%P%$%9$,L58z(B
read     | EAGAIN       | $B%G%P%$%9$,%V%m%C%/$7$h$&$H$9$k!#8e$G:F;n9T$r!#(B
         | ERESTARTSYS  | $B$3$l$,FbIt$N%(%i!<$r<($9!#:F8=2DG=$K$7$F(B
         |              | SCSI $B%A%c%s%M%k$KJs$;$i$l$?$$(B($B%P%0Js9p$N>\:Y(B
         |              | $B$O(B Drew Eckhardts $B$K$h$k(B SCSI-HOWTO $B$r$_$h(B)
write    | EIO          | $BD9$5$,C;$+$9$.(B ($B6&DL%X%C%@9=B$BN$h$j>.$5$$(B)$B!#(B
         |              | $B7Y9p(B: $B8=:_$N=j!"D9$5D62a$N3NG'$O$J$$!#(B
         | EAGAIN       | $B%G%P%$%9$,%V%m%C%/$7$h$&$H$9$k!#8e$G:F;n9T$r!#(B
         | ENOMEM       | $B$3$NMW5a$KI,MW$J%a%b%j$r3dEv$F$G$-$J$+$C$?!#(B
         |              | $B:GBgEAAw%5%$%:$rD6$($F$$$J$$$J$i$P8e$G:F;n9T(B
         |              | $B$r(B($B>e$r$_$h(B)$B!#(B
select   |              | $B$J$7(B
close    |              | $B$J$7(B
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>read/write $B$N@5$NJV$jCM$ONc$K$h$C$FEAAw$K@.8y$7$?%P%$%H?t$r<($7$F$$(B
$B$^$9!#$3$l$OMW5a$7$?%P%$%H?t$HEy$7$$$Y$-$G$9!#(B</P>

<H2><A NAME="ss21.1">21.1</A> <A HREF="SCSI-Programming-HOWTO.html#toc21.1">$B%(%i!<%9%F!<%?%9$N2rFI(B</A>
</H2>

<P>
<A NAME="sec-stat-decoding"></A> 
$B$5$i$K$h$j>\:Y$JJs9p$,%+!<%M%k$N(B <CODE>hd_status</CODE> $B$H(B $B%G%P%$%9$N(B
<CODE>sense_buffer</CODE> $B$K$h$C$F$J$5$l$^$9(B(
<A HREF="SCSI-Programming-HOWTO-10.html#sec-sensebuff">sec-sensebuff</A>
$B>O$r$_$F$/(B
$B$@$5$$(B)$B!#$$$:$l$b6&DL%X%C%@9=B$BN$K$"$j$^$9!#(B</P>
<P><CODE>hd_status</CODE> $B$N0UL#$O(B <CODE>drivers/scsi/scsi.h</CODE> $B$GDs6!$5$l$^$9!'(B
$B$3$N(B <CODE>unsigned int</CODE> $B$O0[$J$kItJ,$+$i9=@.$5$l$F$$$^$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
  lsb  |    ...    |    ...    | msb
=======|===========|===========|============
status | sense key | host code | driver byte
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P><CODE>drivers/scsi/scsi.h</CODE>$B$G$3$l$i$N%^%/%m$r<j$KF~$l$k$3$H$,$G$-(B
$B$k$N$G$9$,!"IT9,$K$7$FK`2DIT;W5D$J%X%C%@%U%!%$%k$NAj8_0MB8$N$?$a$K(B
$B4JC1$K$O;H$($^$;$s!#$3$3$r$-$l$$$K$7$J$$$H$$$1$^$;$s!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
       $B%^%/%m(B          | $B2r@b(B
=======================|====================================================
status_byte(hd_status) | SCSI $BAuCV$N>uBV!#%9%F!<%?%9%3!<%I$N>O$r$_$h!#(B
msg_byte(hd_status)    | $BAuCV$h$j!#(BSCSI sense keys $B$N>O$r$_$h!#(B
host_byte(hd_status)   | $B%+!<%M%k$h$j!#(B Hostcodes $B$N>O$r$_$h!#(B
driver_byte(hd_status) | $B%+!<%M%k$h$j!#(B. midlevel codes $B$N>O$r$_$h!#(B
</PRE>
</CODE></BLOCKQUOTE>
</P>

<H2><A NAME="ss21.2">21.2</A> <A HREF="SCSI-Programming-HOWTO.html#toc21.2">$B%9%F!<%?%9%3!<%I(B</A>
</H2>

<P>
<A NAME="sec-statuscodes"></A> </P>
<P>$B0J2<$N(BSCSI $BAuCV$+$iJV$5$l$k%9%F!<%?%9%3!<%I$,(B(<CODE>scsi/scsi.h</CODE>$B$GDj(B
$B5A$5$l$F$$$^$9(B)$BMxMQ2DG=$G$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
 $BCM(B   | $B%7%s%\%k(B
======|=====================
0x00  | GOOD
0x01  | CHECK_CONDITION
0x02  | CONDITION_GOOD
0x04  | BUSY
0x08  | INTERMEDIATE_GOOD
0x0a  | INTERMEDIATE_C_GOOD
0x0c  | RESERVATION_CONFLICT
</PRE>
</CODE></BLOCKQUOTE>
</P>

<P>$B$3$l$i$N%7%s%\%k$NCM$O(B<B>$B1&$K0l$D%7%U%H(B</B>$B$5$l$F$$$k$3$H$KCm0U$7$F(B
$B$/$@$5$$!#%9%F!<%?%9$,(B CHECK_CONDITION $B$N$H$-$J$i$P!"%;%s%9%P%C%U%!(B
$BFb$N%;%s%9%G!<%?$OM-8z$G$9(B($BFC$KDI2CE*$J%;%s%9%3!<%I$HDI2CE*$J%;%s%9(B
$B%3!<%I%/%*%j%U%!%$%"$r3NG'$7$F$/$@$5$$(B)$B!#(B</P>
<P>$B$3$l$i$NCM$K$O(B SCSI-2 $B;EMM=q$K$h$k$H<!$N$h$&$J0UL#$,$"$j$^$9!#(B
<BLOCKQUOTE><CODE>
<PRE>

                           Table 27: Status Byte Code
+=================================-==============================+
|       Bits of Status Byte       |  Status                      |
|  7   6   5   4   3   2   1   0  |                              |
|---------------------------------+------------------------------|
|  R   R   0   0   0   0   0   R  |  GOOD                        |
|  R   R   0   0   0   0   1   R  |  CHECK CONDITION             |
|  R   R   0   0   0   1   0   R  |  CONDITION MET               |
|  R   R   0   0   1   0   0   R  |  BUSY                        |
|  R   R   0   1   0   0   0   R  |  INTERMEDIATE                |
|  R   R   0   1   0   1   0   R  |  INTERMEDIATE-CONDITION MET  |
|  R   R   0   1   1   0   0   R  |  RESERVATION CONFLICT        |
|  R   R   1   0   0   0   1   R  |  COMMAND TERMINATED          |
|  R   R   1   0   1   0   0   R  |  QUEUE FULL                  |
|                                 |                              |
|       All Other Codes           |  Reserved                    |
|----------------------------------------------------------------|
|  Key: R = Reserved bit                                         |
+================================================================+
</PRE>
</CODE></BLOCKQUOTE>

$B%9%F!<%?%9%P%$%H%3!<%I$NDj5A$r0J2<$KM?$($k!#(B
<BLOCKQUOTE><CODE>
<PRE>
GOOD.  $B$3$N>uBV$O%?!<%2%C%H$,%3%^%s%I$N<B9T$K@.8y$7$?$3$H$r<($9!#(B

CHECK CONDITION.  $B$3$N>uBV$O(B contingent allegiance condition $B$,H/@8$7$?(B
$B$3$H$r<($9!#(B(6.6$B$r$_$h(B)$B!#(B

CONDITION MET.  $B$3$N>uBV$b$7$/$O(B INTERMEDIATE-CONDITION MET $B$OMW5a$7$?(B
$BA`:n$,C#@.$5$l$?$H$-$K$O$$$D$G$bJV$5$l$k!#(B(SEARCH DATA $B5Z$S(B PRE-FETCH
$B%3%^%s%I$r$_$h(B)$B!#(B

BUSY.  $B$3$N>uBV$O%?!<%2%C%H$,%S%8!<$G$"$k$3$H$r<($9!#$3$N>uBV$O%?!<%2%C%H(B
$B$,%3%^%s%I$r$=$NB>$N<uIU2DG=$J%$%K%7%(!<%?(B($B$9$J$o$AJ]N1$G$-$J$$>WFM(B)$B$+$i$N(B
$B%3%^%s%I$r<u$1IU$1$k$3$H$,$G$-$J$$$H$-$O$$$D$G$bJV$5$l$k$G$"$m$&!#?d>)$5$l(B
$B$k%$%K%7%(!<%?$N2sI|F0:n$O8e$N;~E@$G:F$S%3%^%s%I$rH/9T$9$k$3$H$G$"$k!#(B

INTERMEDIATE. $B$3$N>uBV$b$7$/$O(B INTERMEDIATE-CONDITION MET $B$O!"%3%^%s%I$,(B
CHECK CONDITION, RESERVATION CONFLICT $B$b$7$/$O(B COMMAND TERMINATED $B%9%F!<%?%9(B
$B$K$h$C$F$O=*N;$7$J$+$C$?>l9g$K!"0l$D$J$,$j$NO"7k$7$?%3%^%s%I72(B($B:G8e$N%3%^%s(B
$B%I$r=|$/(B)$B$K$*$$$F3F%3%^%s%I$N<B9T$K@.8y$7$?$H$-$KJV$5$l$k!#$b$7(B INTERMEDIATE
$B$"$k$$$O(B INTERMEDIATE-CONDITION MET $B%9%F!<%?%9$,JV$5$l$J$$$J$i$P!"$=$NO"7k$7(B
$B$?%3%^%s%INs$O=*N;$7$FF~=PNOA`:n$O=*$($i$l$F$$$k!#(B

INTERMEDIATE-CONDITION MET.  $B$3$N>uBV$O(B CONDITON MET $B$H(B INTERMEDIATE $B%9%F!<%?(B
$B%9$,AH9g$5$C$?$b$N$G$"$k!#(B

RESERVATION CONFLICT.  $B$3$N>uBV$O%$%K%7%(!<%?$,JL$N(B SCSI $BAuCV$KBP$7$F>WFMJ]N1(B
$BM=Ls7?$H$7$F;XDj$5$l$F$$$k%m%8%+%k%f%K%C%H$b$7$/$O%m%8%+%k%f%K%C%HFbIt$NDxEY(B
[?? extent ??]$B$K%"%/%;%9$r;n$_$?>l9g$KI,$:JV$5$l$k!#?d>)$5$l$k%$%K%7%(!<%?$N2sI|(B
$BF0:n$O8e$N;~E@$G:FEY%3%^%s%I$rH/9T$9$k$3$H$G$"$k!#(B

COMMAND TERMINATED.  $B$3$N>uBV$O(B TERMINATE I/O PROCESS $B%a%C%;!<%8(B(5.6.22 $B$r$_$h(B)
$B$r<u$1<h$C$?$"$H$G%?!<%2%C%H$,8=:_$NF~=PNOA`:n$r=*N;$5$;$k>l9g$KJV$5$l$k!#$3$N(B
$B>uBV$O$^$?(B contingent allegiance condition $B$,H/@8$7$?$3$H$b<($7$F$$$k(B(6.6 $B$r$_$h(B)$B!#(B

QUEUE FULL.  $B$3$N>uBV$O%?%0IU$1$5$l$?%-%e!<A`:n$,<BAu$5$l$F$$$k>l9g$K<BAu$5$l$k(B
$B$H$9$k!#$3$N>uBV$O(B SIMPLE QUEUE TAG, ORDERED QUEUE TAG $B$b$7$/$O(B HEAD OF QUEUE TAG
$B%a%C%;!<%8$,<u$1<h$i$l%3%^%s%I%-%e!<$,$$$C$Q$$$G$"$k$H$-$KJV$5$l$k!#F~=PNOA`:n(B
$B$O%3%^%s%I%-%e!<Fb$KG[CV$5$l$J$$!#(B
</PRE>
</CODE></BLOCKQUOTE>
</P>


<H2><A NAME="ss21.3">21.3</A> <A HREF="SCSI-Programming-HOWTO.html#toc21.3">SCSI Sense Keys</A>
</H2>

<P>
<A NAME="sec-sensekeys"></A> 
$B$3$l$i$N%+!<%M%k%7%s%\%k(B(<CODE>scsi/scsi.h</CODE>$B$h$j(B)$B$,$"$i$+$8$aDj5A(B
$B$5$l$F$$$^$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
Value | Symbol
======|================
0x00  | NO_SENSE
0x01  | RECOVERED_ERROR
0x02  | NOT_READY
0x03  | MEDIUM_ERROR
0x04  | HARDWARE_ERROR
0x05  | ILLEGAL_REQUEST
0x06  | UNIT_ATTENTION
0x07  | DATA_PROTECT
0x08  | BLANK_CHECK
0x0a  | COPY_ABORTED
0x0b  | ABORTED_COMMAND
0x0d  | VOLUME_OVERFLOW
0x0e  | MISCOMPARE
</PRE>
</CODE></BLOCKQUOTE>
</P>

<P>SCSI-2 $BJ8=q$K$"$k%j%9%H$=$N$^$^$O0J2<$NDL$j$G$9(B(7.2.14.3 $B>O$h$j(B)$B!#(B
<BLOCKQUOTE><CODE>
<PRE>
                    Table 69: Sense Key (0h-7h) Descriptions
+========-====================================================================+
| Sense  |  Description                                                       |
|  Key   |                                                                    |
|--------+--------------------------------------------------------------------|
|   0h   |  NO SENSE.  Indicates that there is no specific sense key          |
|        |  information to be reported for the designated logical unit.  This |
|        |  would be the case for a successful command or a command that      |
|        |  received CHECK CONDITION or COMMAND TERMINATED status because one |
|        |  of the filemark, EOM, or ILI bits is set to one.                  |
|--------+--------------------------------------------------------------------|
|   1h   |  RECOVERED ERROR.  Indicates that the last command completed       |
|        |  successfully with some recovery action performed by the target.   |
|        |  Details may be determinable by examining the additional sense     |
|        |  bytes and the information field.  When multiple recovered errors  |
|        |  occur during one command, the choice of which error to report     |
|        |  (first, last, most severe, etc.) is device specific.              |
|--------+--------------------------------------------------------------------|
|   2h   |  NOT READY.  Indicates that the logical unit addressed cannot be   |
|        |  accessed.  Operator intervention may be required to correct this  |
|        |  condition.                                                        |
|--------+--------------------------------------------------------------------|
|   3h   |  MEDIUM ERROR.  Indicates that the command terminated with a non-  |
|        |  recovered error condition that was probably caused by a flaw in   |
|        |  the medium or an error in the recorded data.  This sense key may  |
|        |  also be returned if the target is unable to distinguish between a |
|        |  flaw in the medium and a specific hardware failure (sense key 4h).|
|--------+--------------------------------------------------------------------|
|   4h   |  HARDWARE ERROR.  Indicates that the target detected a non-        |
|        |  recoverable hardware failure (for example, controller failure,    |
|        |  device failure, parity error, etc.) while performing the command  |
|        |  or during a self test.                                            |
|--------+--------------------------------------------------------------------|
|   5h   |  ILLEGAL REQUEST.  Indicates that there was an illegal parameter in|
|        |  the command descriptor block or in the additional parameters      |
|        |  supplied as data for some commands (FORMAT UNIT, SEARCH DATA,     |
|        |  etc.).  If the target detects an invalid parameter in the command |
|        |  descriptor block, then it shall terminate the command without     |
|        |  altering the medium.  If the target detects an invalid parameter  |
|        |  in the additional parameters supplied as data, then the target may|
|        |  have already altered the medium.  This sense key may also indicate|
|        |  that an invalid IDENTIFY message was received (5.6.7).            |
|--------+--------------------------------------------------------------------|
|   6h   |  UNIT ATTENTION.  Indicates that the removable medium may have been|
|        |  changed or the target has been reset.  See 6.9 for more detailed  |
|        |  information about the unit attention condition.                   |
|--------+--------------------------------------------------------------------|
|   7h   |  DATA PROTECT.  Indicates that a command that reads or writes the  |
|        |  medium was attempted on a block that is protected from this       |
|        |  operation.  The read or write operation is not performed.         |
+=============================================================================+

                    Table 70: Sense Key (8h-Fh) Descriptions
+========-====================================================================+
| Sense  |  Description                                                       |
|  Key   |                                                                    |
|--------+--------------------------------------------------------------------|
|   8h   |  BLANK CHECK.  Indicates that a write-once device or a sequential- |
|        |  access device encountered blank medium or format-defined end-of-  |
|        |  data indication while reading or a write-once device encountered a|
|        |  non-blank medium while writing.                                   |
|--------+--------------------------------------------------------------------|
|   9h   |  Vendor Specific.  This sense key is available for reporting vendor|
|        |  specific conditions.                                              |
|--------+--------------------------------------------------------------------|
|   Ah   |  COPY ABORTED.  Indicates a COPY, COMPARE, or COPY AND VERIFY      |
|        |  command was aborted due to an error condition on the source       |
|        |  device, the destination device, or both.  (See 7.2.3.2 for        |
|        |  additional information about this sense key.)                     |
|--------+--------------------------------------------------------------------|
|   Bh   |  ABORTED COMMAND.  Indicates that the target aborted the command.  |
|        |  The initiator may be able to recover by trying the command again. |
|--------+--------------------------------------------------------------------|
|   Ch   |  EQUAL.  Indicates a SEARCH DATA command has satisfied an equal    |
|        |  comparison.                                                       |
|--------+--------------------------------------------------------------------|
|   Dh   |  VOLUME OVERFLOW.  Indicates that a buffered peripheral device has |
|        |  reached the end-of-partition and data may remain in the buffer    |
|        |  that has not been written to the medium.  A RECOVER BUFFERED DATA |
|        |  command(s) may be issued to read the unwritten data from the      |
|        |  buffer.                                                           |
|--------+--------------------------------------------------------------------|
|   Eh   |  MISCOMPARE.  Indicates that the source data did not match the data|
|        |  read from the medium.                                             |
|--------+--------------------------------------------------------------------|
|   Fh   |  RESERVED.                                                         |
+=============================================================================+
</PRE>
</CODE></BLOCKQUOTE>
</P>


<H2><A NAME="ss21.4">21.4</A> <A HREF="SCSI-Programming-HOWTO.html#toc21.4">Host codes</A>
</H2>

<P>
<A NAME="sec-hostcodes"></A> 
$B0J2<$N(B host code $B$O(B <CODE>drivers/scsi/scsi.h</CODE> $B$K$*$$$FDj5A$5$l$F$$$^$9!#(B
$B$3$l$i$O%+!<%M%k%I%i%$%P$K$h$j%;%C%H$5$l$^$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
Value | Symbol         | Description
======|================|========================================
0x00  | DID_OK         | No error
0x01  | DID_NO_CONNECT | Couldn't connect before timeout period
0x02  | DID_BUS_BUSY   | BUS stayed busy through time out period
0x03  | DID_TIME_OUT   | TIMED OUT for other reason
0x04  | DID_BAD_TARGET | BAD target
0x05  | DID_ABORT      | Told to abort for some other reason
0x06  | DID_PARITY     | Parity error
0x07  | DID_ERROR      | internal error
0x08  | DID_RESET      | Reset by somebody
0x09  | DID_BAD_INTR   | Got an interrupt we weren't expecting
</PRE>
</CODE></BLOCKQUOTE>
</P>

<H2><A NAME="ss21.5">21.5</A> <A HREF="SCSI-Programming-HOWTO.html#toc21.5">Driver codes</A>
</H2>

<P>
<A NAME="sec-drivercodes"></A> 
$BCf4VAX$N%I%i%$%P$OAuCV$+$i$N%;%s%9%-!<$K4p$E$$$FDc?e=`%I%i%$%P$+$i(B
$BJV$5$l$?>uBV$rN`JL$7$^$9!#$5$i$K:F;n9T!"Cf;_$"$k$$$O:F%^%C%W$H$$$C$?(B
$B$H$k$Y$-$$$/$D$+$NF0:n$r<(:6$7$^$9!#(B</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
Value | Symbol         | Description of Driver status
======|================|========================================
0x00  | DRIVER_OK      | No error
0x01  | DRIVER_BUSY    | not used
0x02  | DRIVER_SOFT    | not used
0x03  | DRIVER_MEDIA   | not used
0x04  | DRIVER_ERROR   | internal driver error
0x05  | DRIVER_INVALID | finished (DID_BAD_TARGET or DID_ABORT)
0x06  | DRIVER_TIMEOUT | finished with timeout
0x07  | DRIVER_HARD    | finished with fatal error
0x08  | DRIVER_SENSE   | had sense information available
</PRE>
</CODE></BLOCKQUOTE>
</P>
<P>
<BLOCKQUOTE><CODE>
<PRE>
Value | Symbol         | Description of suggestion
======|================|========================================
0x10  | SUGGEST_RETRY  | retry the SCSI request
0x20  | SUGGEST_ABORT  | abort the request
0x30  | SUGGEST_REMAP  | remap the block (not yet implemented)
0x40  | SUGGEST_DIE    | let the kernel panic
0x80  | SUGGEST_SENSE  | get sense information from the device
0xff  | SUGGEST_IS_OK  | nothing to be done
</PRE>
</CODE></BLOCKQUOTE>
</P>

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