On Sun, Mar 15, 2020 at 9:24 PM Chao Yu <yuch...@huawei.com> wrote:
>
> What's your mount option and mkfs option on those two partitions, and what's
> your kernel version?

I am mounting the partitions with systemd like so (/etc/fstab entry):
  LABEL=incoming         /incoming     f2fs  noauto,x-systemd.automount  0 0

But I can reproduce this if I totally remove the entries within
/etc/fstab, reboot, and mount manually like this:
  mount LABEL=incoming /incoming

Inspecting my shell history, I created them both with this command:
  mkfs.f2fs -l incoming /dev/sdb2

I am running 5.5.9 on Arch Linux, but I believe I experienced this
under previous 5.5.x series as well.

If you create a F2FS partition using the latest stable release of
f2fs-tools (1.13.0) are you able to reproduce the inability to trim?

Thank you for the consideration!

> I checked the code, only place where we give 'not supported' is as below
> by checking whether underlying device supports discard.
>
> f2fs_ioc_fitrim()
>
>         if (!f2fs_hw_support_discard(F2FS_SB(sb)))
>                 return -EOPNOTSUPP;
>
> So this should not happen that two partitions locates in one device have
> inconsistent discard support status.


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