Hi. > On 16 Nov 2017, at 10:40, coypu%SDF.ORG@localhost wrote: > > From the looks of it, the ext2fs code only updates the primary > superblock: > (…) > I'm under the impression that the secondary ones exist as > backups and are meant to be usable. > > Is this wrong or am I misunderstanding things? As far as I know, Linux does not update backup superblocks under normal operation. Only primary is updated. Backup superblock are always set to “not clean”, so that free blocks/inodes/last mount are expected to be bad there. So this behaviour of ext2fs_sbupdate is most likely correct. Best regards, Radoslaw
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