El dom, 29-06-2008 a las 20:11 +0200, Felix Zielcke escribió: > Hello, > > I reported this already on Debian as #488235 > > grub-probe -t fs shows ext2 for a filesystem created with e2fsprogs 1.41WIP > from Debian experimental > with extent and flex_bg > I didn't get grub-probe working with the loopback device even though I added > it to device.map it still complained. > The attached image is a 10 mb ext4 made with mkfs.ext4 without any special > options just the extent and flex_bg features enabled by mke2fs.conf > If I make that on a 100 MB Disk in VMware grub-probe -t fs shows ext2 so I > think it shouldn't be different on that 10 MB file
ext4 on-disk format is very similar to ext2, but backwards compatibility is broken by the extents option (and iIrc, a modification in the inode format?). Thus, we need to patch our ext2/3 drivers so that they reject mounting a filesystem with the "extents" feature bit set, as a temporary solution. Then, we can develop an ext4 driver that understands the new format.
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