f2fs not mountable: CRC validation failed

[Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>]

Hi all,

I apologize in advance in case this is the
wrong place for support (if so, please
point me in the right direction).

I've an USB stick formatted with f2fs,
used under Linux on a RPi2.
To be clear, it is a USB device, not
an SD card.

After a crash, the USB stick is not mountable
any more.
There is no HW error on the stick.

A "fsck" returns, among other information:

[f2fs_crc_valid: 486] CRC validation failed: cal_crc = 3543933224, blk_crc = 719768680 buff_size = 0xffc
[f2fs_crc_valid: 486] CRC validation failed: cal_crc = 1071250051, blk_crc = 2385854943 buff_size = 0xffc
[f2fs_do_mount:2018] Can't find valid checkpoint

And it does not perform any check / repair.

I'm a bit puzzled, I wonder if there is way
to force a repair, partially could be OK too.

Clearly, "fsck.f2fs -f" did not work.

Any chance to save some data?

f2fs-tools is version 1.8.0 (I guess it's latest).

System is Fedora 25, the tool is self compiled.

Thanks a lot in advance, in case other information
are required, please let me know.

bye,

-- 

piergiorgio

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