On 12/9/16 2:29 PM, Andreas Dilger wrote: > On Dec 8, 2016, at 10:40 PM, Simon Matthews <simon.d.matthews@xxxxxxxxx> wrote: >> >> I have an ext3 filesystem that will not mount under newer versions of >> the kernel and I hope someone here can help. >> >> Obviously, one solution is "backup and re-create from scratch". I have >> the backups, but I hope that there may be a quicker method to fix the >> issues. >> >> The root issue is that the filesystem is very slightly smaller than >> the allocated space. So the device is now smaller than the filesystem thinks, right? > The filesystem exists on a MDRAID device and I >> think that when I converted the MDRAID to a newer metadata version, it >> truncated the available size, slightly. However, how I got here isn't >> really important, fixing it now is. > > Running "e2fsck -fy" should fix this. I'd recommend to use the latest > version of e2fsck. Reaslly? e2fsck can change total blocks in the superblock to accomodate a shrunken device? That's a new one for me... I don't think so: $ truncate --size=101m testfile $ mkfs.ext3 testfile $ truncate --size=100m testfile $ e2fsck -f testfile ... The physical size of the device is 102400 blocks Either the superblock or the partition table is likely to be corrupt! Abort<y>? n ... $ e2fsck -f testfile ... The physical size of the device is 102400 blocks Either the superblock or the partition table is likely to be corrupt! Abort<y>? n $ e2fsck -f testfile ... The physical size of the device is 102400 blocks Either the superblock or the partition table is likely to be corrupt! Abort<y>? n etc. The proper solution is to fix your block device, not the filesystem; it was the block device which was inappropriately shortened. I don't know if just poking a smaller total blocks number into the superblock via debugfs would be safe or not. -Eric > Cheers, Andreas -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
