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Message-ID: <CAMu38xK8gEpWurPsV=ViYgZ+Sa50id0P501W3ZY4Z4R=z5PNhQ@mail.gmail.com> Date: Wed, 2 Sep 2015 00:30:39 -0300 From: Albino B Neto <bino@...eup.net> To: Austin S Hemmelgarn <ahferroin7@...il.com> Cc: Raymond Jennings <shentino@...il.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Jan Kara <jack@...e.cz>, LKML <linux-kernel@...r.kernel.org>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org> Subject: Re: [GIT PULL] Ext3 removal, quota & udf fixes 2015-08-31 23:53 GMT-03:00 Theodore Ts'o <tytso@....edu>: > 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 <ahferroin7@...il.com>: > 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-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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