201 lines
4.7 KiB
HTML
201 lines
4.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SD</TITLE>
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</HEAD><BODY>
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<H1>SD</H1>
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Section: Linux Programmer's Manual (4)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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sd - driver for SCSI disk drives
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/linux/hdreg.h">linux/hdreg.h</A>> </B>/* for HDIO_GETGEO */
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<B>#include <<A HREF="file:///usr/include/linux/fs.h">linux/fs.h</A>> </B>/* for BLKGETSIZE and BLKRRPART */
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>CONFIGURATION</H2>
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The block device name has the following form:
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<B>sd</B><I>lp,</I>
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where
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<I>l</I>
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is a letter denoting the physical drive, and
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<I>p</I>
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is a number denoting the partition on that physical drive.
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Often, the partition number,
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<I>p</I>,
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will be left off when the device corresponds to the whole drive.
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<P>
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SCSI disks have a major device number of 8, and a minor device number of
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the form (16 *
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<I>drive_number</I>) + <I>partition_number</I>,
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where
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<I>drive_number</I>
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is the number of the physical drive in order of detection, and
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<I>partition_number</I>
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is as follows:
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<DL COMPACT>
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<DT id="1">+3<DD>
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partition 0 is the whole drive
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<DT id="2"><DD>
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partitions 1-4 are the DOS "primary" partitions
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<DT id="3"><DD>
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partitions 5-8 are the DOS "extended" (or "logical") partitions
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</DL>
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<P>
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For example,
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<I>/dev/sda</I>
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will have major 8, minor 0, and will refer to all of the first SCSI drive
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in the system; and
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<I>/dev/sdb3</I>
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will have major 8, minor 19, and will refer to the third DOS "primary"
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partition on the second SCSI drive in the system.
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<P>
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At this time, only block devices are provided.
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Raw devices have not yet been implemented.
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<A NAME="lbAE"> </A>
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<H2>DESCRIPTION</H2>
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The following
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<I>ioctl</I>s
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are provided:
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<DL COMPACT>
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<DT id="4"><B>HDIO_GETGEO</B>
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<DD>
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Returns the BIOS disk parameters in the following structure:
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</DL>
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<P>
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struct hd_geometry {
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<BR> unsigned char heads;
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<BR> unsigned char sectors;
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<BR> unsigned short cylinders;
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<BR> unsigned long start;
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};
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<DL COMPACT>
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<DT id="5"><DD>
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A pointer to this structure is passed as the
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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parameter.
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<DT id="6"><DD>
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The information returned in the parameter is the disk geometry of the drive
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<I>as understood by DOS!</I>
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This geometry is
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<I>not</I>
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the physical geometry of the drive.
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It is used when constructing the
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drive's partition table, however, and is needed for convenient operation
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of
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<B><A HREF="/cgi-bin/man/man2html?1+fdisk">fdisk</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?1+efdisk">efdisk</A></B>(1),
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and
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<B><A HREF="/cgi-bin/man/man2html?1+lilo">lilo</A></B>(1).
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If the geometry information is not available, zero will be returned for all
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of the parameters.
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<DT id="7"><B>BLKGETSIZE</B>
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<DD>
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Returns the device size in sectors.
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The
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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parameter should be a pointer to a
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<I>long</I>.
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<DT id="8"><B>BLKRRPART</B>
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<DD>
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Forces a reread of the SCSI disk partition tables.
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No parameter is needed.
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<DT id="9"><DD>
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The SCSI
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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operations are also supported.
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If the
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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parameter is required, and it is NULL, then
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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fails with the error
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<B>EINVAL</B>.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>FILES</H2>
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<DL COMPACT>
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<DT id="10"><I>/dev/sd[a-h]</I>
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<DD>
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the whole device
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<DT id="11"><I>/dev/sd[a-h][0-8]</I>
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<DD>
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individual block partitions
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</DL>
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<A NAME="lbAG"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="12"><A HREF="#lbAB">NAME</A><DD>
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<DT id="13"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="14"><A HREF="#lbAD">CONFIGURATION</A><DD>
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<DT id="15"><A HREF="#lbAE">DESCRIPTION</A><DD>
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<DT id="16"><A HREF="#lbAF">FILES</A><DD>
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<DT id="17"><A HREF="#lbAG">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:02 GMT, March 31, 2021
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</BODY>
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</HTML>
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