Comment 1 for bug 66685

/target # touch foo
/target # rm foo
/target # cd usr
/target/usr # touch foo
touch: foo: No space left on device
/target/usr # df
Filesystem 1k-blocks Used Available Use% Mounted on
tmpfs 257312 120 257192 0% /dev
tmpfs 257312 120 257192 0% /.dev
/dev/mapper/raisuck-root 4184064 10336 4173728 0% /target
/dev/md/0 233255 4127 216684 2% /target/boot
/dev/mapper/raisuck-home 1048540 32840 1015700 3% /target/home
/dev/mapper/raisuck-srv 1351250 13 1279148 0% /target/srv
/dev/mapper/raisuck-tmp 982728 32911 939332 3% /target/tmp
/dev/mapper/raisuck-usr 4193472 182856 3800904 5% /target/usr
/dev/mapper/raisuck-var 4184064 63328 4120736 2% /target/var
/target/usr # mount
[...]
/dev/mapper/raisuck-usr on /target/usr type ext3 (rw,data=ordered)

Kernel bug, IMO. 'strace touch foo' says:
[...]
open("foo", O_RDWR|O_CREAT|O_LARGEFILE, 0666) = -1 ENOSPC (No space left on dev)