cannot remove files: "rm" gives "no space left on device", 3.2.0-24, ubuntu

[rupert THURNER <rupert.thurner@gmail.com>]

how would i be able to delete something off this btrfs partition
again? i saw the following messages in the archives which seem to be a
little similar ... except a reboot and therfor a remount did not help:
* http://article.gmane.org/gmane.linux.kernel/1265666/match=enospc

rt@tv:~$ rm -rf /media/388gb-data/.Trash-1000/info/foto.trashinfo
rm: cannot remove `/media/388gb-data/.Trash-1000/info/foto.trashinfo':
No space left on device

rt@tv:~$ btrfs filesystem df /media/388gb-data/
Data: total=260.59GB, used=254.56GB
System: total=32.00MB, used=24.00KB
Metadata: total=128.00GB, used=120.01GB

rt@tv:~$ sudo btrfs filesystem show /dev/sda6
failed to read /dev/sr0
Label: '388gb-data'  uuid: 19223a9e-7840-4798-8ee4-02b5bf9c2899
	Total devices 1 FS bytes used 374.56GB
	devid    1 size 388.62GB used 388.62GB path /dev/sda6

rt@tv:~$ uname -a
Linux tv 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:51:22 UTC 2012
i686 i686 i386 GNU/Linux

the only snapshot is the one created during converting from ext4:
$ sudo btrfs subvolume list /media/388gb-data/
ID 256 top level 5 path ext2_saved


open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=4480528, ...}) = 0
mmap2(NULL, 262144, PROT_READ, MAP_PRIVATE, 3, 0x2bd) = 0xb7553000
mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 3, 0x43a) = 0xb7552000
close(3)                                = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
lstat64("/", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
fstatat64(AT_FDCWD,
"/media/388gb-data/.Trash-1000/info/foto.trashinfo",
{st_mode=S_IFREG|0644, st_size=56, ...}, AT_SYMLINK_NOFOLLOW) = 0
unlinkat(AT_FDCWD,
"/media/388gb-data/.Trash-1000/info/foto.trashinfo", 0) = -1 ENOSPC
(No space left on device)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7551000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2570
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0xb7551000, 4096)                = 0
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1
ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=619, ...}) = 0
mmap2(NULL, 619, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7551000
close(3)                                = 0
write(2, "rm: ", 4rm: )                     = 4
write(2, "cannot remove `/media/388gb-data"..., 65cannot remove
`/media/388gb-data/.Trash-1000/info/foto.trashinfo') = 65
open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT
(No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) =
-1 ENOENT (No such file or directory)
write(2, ": No space left on device", 25: No space left on device) = 25
write(2, "\n", 1
)                       = 1
_llseek(0, 0, 0xbfe0d210, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
close(0)                                = 0


rupert