2015-08-31 23:53 GMT-03:00 Theodore Ts'o <[email protected]>: > Yes, you can go back to ext3-only. In fact, we do *not* automatically > upgrade the file system to use ext4-specific features. > >> So it's not just a "you can use ext4 instead" issue. Can you do that >> *without* then forcing an upgrade forever on that partition? I'm not >> sure the ext4 people are really even willing to guarantee that kind of >> backwards compatibility. > > Actually, we do guarantee this. It's considered poor form to > automatically change the superblock to add new file system features in > a way that would break the ability for the user to roll back to an > older kernel. This isn't just for ext3->ext4, but for new ext4 > features such as metadata checksumming. The user has to explicitly > enable the feature using "tune2fs -O new_feature /dev/sdXX".
Yeah! 2015-09-01 16:39 GMT-03:00 Austin S Hemmelgarn <[email protected]>: > NO, it is not logical. A vast majority of Android smartphones in the wild > use ext2, as do a very significant portion of embedded systems that don't > have room for the few hundred kilobytes of extra code that the ext4 driver > has in comparison to ext2. Ext2 portion embedded and Ext3 many machines. -- Albino B Neto www.bino.us "Debian. Freedom to code. Code to freedom!" faw -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
