[arch-general] partition mount, strange entry in log

[gt]

>From the past few weeks, i get this in the log during boot:

kernel: [    8.165927] EXT4-fs (sdb1): mounting ext3 file 
system using the ext4 subsystem
kernel: [    8.194637] EXT4-fs (sdb1): mounted filesystem 
with ordered data mode. Opts: (null)

Here's the relevant part of the fstab:

UUID=<------> /mnt/sdb1 ext3 
auto,users,rw,exec,noatime 0 2

I understand that this isn't anything worrysome, but what exactly does
this mean: "using the ext4 subsytem"

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