[f2fs-dev] TRIM issue

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

Hi all,

I've a small box, with Fedora 31 up-to-date.

The system has LUKS + LVM + f2fs.

Since kernel 5.3.16-300.fc31.x86_64 the fstrim.service,
triggered by the systemd service fstrim.timer or from
command line, does return an error:

Starting Discard unused blocks on filesystems from /etc/fstab...
fstrim: /home: FITRIM ioctl failed: Read-only file system
fstrim: /: FITRIM ioctl failed: Read-only file system
fstrim.service: Main process exited, code=exited, status=32/n/a
fstrim.service: Failed with result 'exit-code'.
Failed to start Discard unused blocks on filesystems from /etc/fstab.

Note the following:
1) Both /home and / are rw
2) LUKS and LVM allow discard to the underlying device
3) An other PC, with same layout, but ext4, does work as expected
4) kernel 5.4.7-200.fc31.x86_64 (latest for f31) has same result
5) fstrim -vA or -va does not return an error, exit code is 0,
but it always says 0 (zero) bytes are trimmed:

/home: 0 B (0 bytes) trimmed on /dev/mapper/fedora--server-home
/: 0 B (0 bytes) trimmed on /dev/mapper/fedora--server-root

6) mount shows that the f2fs mounts have "discard" flag

So, I suspect there is something with f2fs which somehow
confuses the trimming process.

I had a quick search, but I could not find any other
similar report, except one about systemd, but that
does not seem related.

Any idea? Suggestions?
Debugging possibilities?

Thanks a lot in advance,

bye,

-- 

piergiorgio


_______________________________________________
Linux-f2fs-devel mailing list
Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel