Date: Fri, 24 Sep 2010 13:13:34 -0700 From: Aaron <drizzt321@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: Linux filesystems accessible from FreeBSD 8-stable? Message-ID: <AANLkTinOxhGy69KzDwmwQ51EcwxLb8khYtFTrYQwcDe7@mail.gmail.com> In-Reply-To: <AANLkTi=q6rFDr-eNybRuKT_2z7gaaO=DojL28sv7Ee3Z@mail.gmail.com> References: <AANLkTikOW49RPGopPaw5OxkfdA1vQYW=h77Co7LsCwyC@mail.gmail.com> <AANLkTinXOyVpnR9QOQ2S=aWxXzyGaoEMBVycY5iqHrb%2B@mail.gmail.com> <AANLkTi=q6rFDr-eNybRuKT_2z7gaaO=DojL28sv7Ee3Z@mail.gmail.com>
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On Fri, Sep 24, 2010 at 12:21, Leif Walsh <leif.walsh@gmail.com> wrote: > On Fri, Sep 24, 2010 at 2:04 PM, krad <kraduk@gmail.com> wrote: >> Im not 100% sure=A0 (probably about 60% actually) but cant you mount ext= 4 as >> ext2? From what i vaguly remember there will be some limitations but its >> worth having a look > > =A0# mount -t ext2fs /dev/ad4p1 /mnt > mount: /dev/ad4p1 : Invalid argument > > Unless there's something I'm missing, nope. =A0ext3 works because the > only difference between it and ext2 is the journal, I believe the > on-disk format of ext4 is different (though maybe I'm wrong and the > bsd drivers for ext2 just are too conservative?). > > -- > Cheers, > Leif > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" > Doesn't look like you can mount an ext4 as ext2/3 if you have extents enabled, which is probably enabled by default if you create a new filesystem. >From https://ext4.wiki.kernel.org/index.php/Frequently_Asked_Questions#Can_= I_mount_existing_Ext3_as_Ext4.3F_And_vice_versa.3F_Similarly_from_Ext2_to_E= xt4_and_its_reverse.3F "Once you have enabled extents or created a journal on a former ext2 filesystem, it is an ext4 filesystem and cannot be reverted to ext2." >From http://en.wikipedia.org/wiki/Ext4#Features Under "Backward compatibility" header "However, if the ext4 partition uses extents (a major new feature of ext4), then the ability to mount the file system as ext3 is lost. --Aaron
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