On Mon, Mar 23, 2020 at 11:02 AM Jaegeuk Kim <jaeg...@kernel.org> wrote:
> > /dev/mapper/media-crypt /mnt/media f2fs
> > rw,lazytime,relatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,alloc_mode=default,fsync_mode=posix
>
> - media-crypt means dm-crypt? Any chance to try raw sda?

Yes, it is dm-crypt.

> Could you try this?
> - mount -o remount,nodiscard
>  : The reason is, as f2fs uses async discard feature with -o discard, it 
> doesn't
>    give 0 bytes on fstrim sometimes.

I can confirm it is mounted now with the nodiscard option, but fstrim
still claims discard is not supported.

% mount | grep crypt
/dev/mapper/media-crypt on /mnt/media type f2fs
(rw,relatime,lazytime,background_gc=on,nodiscard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,extent_cache,mode=adaptive,active_logs=6,alloc_mode=default,fsync_mode=posix,x-systemd.automount)

# fstrim -v /mnt/media
fstrim: /mnt/media: the discard operation is not supported


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