Can't mount exFAT on Ubuntu 14.10

[unrud]

I've installed the packages exfat-fuse and exfat-utils but I can't mount exFAT filesystems through udisks2.
$ udisksctl mount --block-device /dev/sdb1
Object /org/freedesktop/UDisks2/block_devices/sdb1 is not a mountable filesystem.

Mounting with
$ sudo mount /dev/sdb1 ...
works fine.

It works fine on Ubuntu 14.04.

[unrud (unrud)]

I've traced the problem to udev.
The ID_FS_* properties are missing from the udev device.
udisks2 uses the ID_FS_TYPE property to determine the filesystem type.

[Phillip Susi (psusi)]

udev gets that information from blkid, so does blkid recognize it?

[unrud (unrud)]

blkid doesn't recognize exfat.

The error seems to be in the file "libblkid/src/superblocks/exfat.c" in function "probe_exfat":
In line 124 "if (errno)" is always true because "errno" is already !=0 before "probe_exfat" is called.
The problem can be fixed by either adding "errno = 0;" to the beginning of the "probe_exfat" function or by removing the seemingly useless check altogether.

[unrud (unrud)]

The problem only appears if no label is set for the exfat partition.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.