39 lines
1.4 KiB
HTML
39 lines
1.4 KiB
HTML
<!-- X-URL: http://step.polymtl.ca/~ldd/ext2fs/ext2fs_3.html -->
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<!-- This HTML file has been created by texi2html 1.29
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from ext2fs.texi on 3 August 1994 -->
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<TITLE>Analysis of the Ext2fs structure - Groups</TITLE>
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<P>Go to the <A HREF="ext2fs_2.html">previous</A>, <A HREF="ext2fs_4.html">next</A> section.<P>
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<A NAME="IDX14"></A>
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<H1><A NAME="SEC3" HREF="ext2fs_toc.html#SEC3">Groups</A></H1>
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<A NAME="IDX15"></A>
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<A NAME="IDX16"></A>
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<P>
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The blocks on disk are divided into groups. Each of these groups
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duplicates critical information of the file system. Moreover, the
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presence of block groups on disk allow the use of efficient disk
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allocation algorithms.
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<A NAME="IDX17"></A>
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<A NAME="IDX18"></A>
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<P>
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Each group contains in that order:
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<P>
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<UL>
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<LI>the superblock. See section <A HREF="ext2fs_4.html#SEC4">Superblock</A>
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<P>
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<LI>the group descriptors. See section <A HREF="ext2fs_5.html#SEC5">Group Descriptors</A>
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<P>
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<LI>the block bitmap of the group. See section <A HREF="ext2fs_6.html#SEC6">Bitmaps</A>
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<P>
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<LI>the inode bitmap of the group.
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<P>
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<LI>the inode table of the group. See section <A HREF="ext2fs_7.html#SEC7">Inodes</A>
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<P>
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<LI>the data blocks in the group. See section <A HREF="ext2fs_2.html#SEC2">Blocks and Fragments</A>
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</UL>
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<P>
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The superblock and group descriptors of each group must carry the same
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values on disk.
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<P>Go to the <A HREF="ext2fs_2.html">previous</A>, <A HREF="ext2fs_4.html">next</A> section.<P>
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