114 lines
3.8 KiB
HTML
114 lines
3.8 KiB
HTML
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-->
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<html>
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<head>
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<title>sfsck</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>sfsck</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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sfsck - check/repair an SFS filesystem
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>/sbin/sfsck</tt> <em>raw-device</em><br>
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<tt>host-sfsck</tt> <em>disk-image-file</em>
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</p>
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<h3>Description</h3>
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<p>
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<tt>sfsck</tt> checks the SFS filesystem on the specified device for
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correctness and consistency. Various possible errors and corrupt
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states are detected and reported; some (but not all) can be corrected.
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</p>
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<p>
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If <tt>sfsck</tt> is used under OS/161, the first form should be used,
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where <em>raw-device</em> is a raw device name (such as "lhd1raw:").
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Don't use a device that's currently mounted.
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</p>
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<p>
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<tt>sfsck</tt> can also be used on the System/161 host OS, in which
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case the second form should be used. The host-compiled version of
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<tt>sfsck</tt> knows how to deal with the header on System/161 disk
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images and does the right thing.
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</p>
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<h3>Requirements</h3>
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<p>
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<tt>sfsck</tt> uses the following system calls:
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<ul>
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<li> <A HREF=../syscall/open.html>open</A>
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<li> <A HREF=../syscall/read.html>read</A>
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<li> <A HREF=../syscall/write.html>write</A>
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<li> <A HREF=../syscall/lseek.html>lseek</A>
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<li> <A HREF=../syscall/fstat.html>fstat</A>
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<li> <A HREF=../syscall/close.html>close</A>
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<li> <A HREF=../syscall/sbrk.html>sbrk</A>
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<li> <A HREF=../syscall/_exit.html>_exit</A>
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</ul>
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</p>
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<p>
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<tt>sfsck</tt> should function properly under OS/161 once you have
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implemented the basic system calls, <tt>sbrk</tt> in the VM system,
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and <tt>fstat</tt>.
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</p>
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<p>
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The host version of <tt>sfsck</tt>, since it runs outside of OS/161,
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should always work regardless of what you have and have not
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implemented.
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</p>
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<p>
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You will likely need to make some changes to <tt>sfsck</tt> in the
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course of doing the file system assignment. If you are implementing
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crash recovery for your file system, be sure to update <tt>sfsck</tt>
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to know about any extra on-disk structures you add. You will want to
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be able to use it to cross-check your recovery code... and so will the
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course staff.
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</p>
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<h3>See Also</h3>
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<p>
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<A HREF=dumpsfs.html>dumpsfs</A>,
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<A HREF=mksfs.html>mksfs</A>
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</p>
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</body>
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</html>
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