Comment 11 for bug 293465
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| Theodore Ts'o (tytso) wrote Re: make ext4 as the primary filesystem for GNU/Linux | #11 |
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73416ba
(Get the code!)
"mke2fs -S" is __very__ dangerous unless you give it exactly the same arguments that was used to make the filesystem in the first place (which probably in this case was something like "mke2fs -t ext4 /dev/sda1", so you have to use "mke2fs -t ext4 -S /dev/sda1" if you want to have any hope of mke2fs -S _not_ trashing your filesystem.
In this case it wouldn't have helped you much, given that e2fsck was able to use the fallback superblocks just fine. The failure was due to a bug in e2fsck -- specifically, an unhandled case where an interior node has a corrupted extent header. The cases where this will even show up is quite rare; I have one inode out of the 760,486 inodes in use that would even potentially be vulnerable to this failure (where the extent tree depth is >=2). In any case, I'll get this fixed in the next version of e2fsck's maintenance release.