Re: [f2fs-dev] How to recover from "Wrong valid_user_blocks"?

[Jaegeuk Kim <jaegeuk@kernel.org>]

On 08/12, John Kehayias via Linux-f2fs-devel wrote:
> Hello again,
> 
> As this is the main disk for a homeserver, I was anxious to get it working again. After reading about what seemed like the same exact problem here: https://old.reddit.com/r/linuxquestions/comments/whomdc/expanded_f2fs_cant_mount/ I thought using a newer f2fs-tools would help (I think I ended up with latest git commit). As I reported earlier though, resize won't do anything (already resized). So I thought about shrinking, though it might be risky.
> 
> First, I tested with a disk image, made with dd and mounted with sudo udisksctl loop-setup -f disk.img. Then I could operate on the loop device with that partition, /dev/loop0p2 in my case. So I tried shrinking, bolstered by the good experiences reported in https://www.mail-archive.com/linux-f2fs-devel@lists.sourceforge.net/msg23214.html Since the size was something like twice the data on it, I didn't worry too much about how much smaller I made it. That was then mountable! So I resized back to the full size, and that still worked. Bonus: working on the disk image was much faster on my SSD than the original memory card.
> 
> I made another fresh image for backup and then repeated these steps on the actual disk (memory card): resize.f2fs to shrink slightly (with -t <some sector amount less than max>) and then resize it fully. Everything worked!
> 
> I have logs of the resizes and fscks happy to share though I know this has been reported and seems fixed in current versions.

Ah, so the recent f2fs-tools addressed your problem, right?

> 
> John
> 
> 
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