Comment 1 for bug 324795

Fix committed as of rev 311

Also this issue seems to be due to an issue with /proc/mounts mangling the spaces, so it might occur with other uncommon labels as well, depending on how they're mangled in /proc/mounts:

/dev/sdc1 /media/has\040spaces vfat rw,nosuid,nodev,uid=500,fmask=0022,dmask=0022,codepage=cp437,iocharset=ascii,utf8 0 0

However the issue isn't consistent system-wide; the df output for the same drive was:

/dev/sdc1 245129 14 245115 1% /media/has spaces