Hi,
I try to format a USB memory with a Btrfs. I can format it with
mkfs.btrfs without problems. But; when I try to mount it, it fails to
mount with the below error messages. But the USB memory works fine with
other filesystems (ext4, XFS etc.). So, the hardware is not faulty.
tark...@tarkane:~$ sudo mkfs.btrfs -d single -n 4096 /dev/sdb1
WARNING! - Btrfs v0.18-26-g0030f1d IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
fs created label (null) on /dev/sdb1
nodesize 4096 leafsize 4096 sectorsize 4096 size 983.98MB
Btrfs v0.18-26-g0030f1d
tark...@tarkane:~$ sudo mount -t btrfs /dev/sdb1 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
And here it is the error log in dmesg
[93428.045686] device fsid 5241391784b5b44e-e9443ebc2843ddb0 devid 1
transid 7 /dev/sdb1
[93428.046593] BTRFS: couldn't mount because of unsupported optional
features (1).
[93428.046627] btrfs: open_ctree failed
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