What Ext2 revisions and Ext2 feature bits does the Ext2 driver support?
Revision 0 (Linux Kernel 2.2 and prior) and revision 1 (dynamic revision, Linux Kernels higher than 2.2) are supported. Revision 1 (dynamic revision) implements feature bits as a kind of version control. These feature bits indicate whether an Ext2 file system residing on a disk has particular feature properties. Almost all feature bits are determined at the time when the Ext2 file system is created. Therefore most of the possible feature bits correspond to the -O switch of the mke2fs tool of Linux. (mke2fs is the “formatting tool” for Ext2 file system and creates such a file system. There is also a tune2fs tool for modifying feature bits of an Ext2 file system.) The current version of the Ext2 file system driver (ext2fs.sys version 1.
