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The past three years have seen many discussions of ext2/3 development.
Some of the planned features  have been
implemented and integrated into the mainline kernel during these three years,
including directory indexing, reservation based block allocation,
online resizing, extended attributes, large inode support, and
extended attributes in large inode. In this section, we will
give an overview of the design and the implementation for each feature.
Features found in Linux 2.6