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debugfs -w -R 'ssv blocks_count <new_count>' <device>" and then ran "e2fsck -fy -b0 <device>" and despite some expected errors (superblock corrupt, group descriptors corrupt, inode count bad), by e2fsck it appears to work. This was a test filesystem resizing from 1GB to 2GB, so YMMV. I would suggest doing this on a filesystem image to verify that it is working properly, and so that you don't lose your data.