On 08/05/2014 07:01 PM, Ben Hutchings wrote:
> On Sun, 2014-08-03 at 20:27 -0700, Nikolaus Rath wrote:
>> Package: src:linux
>> Version: 3.14.13-2
>> Severity: normal
>> File: /boot/vmlinuz-3.14-2-amd64
>>
>> I was peacefully transferring a big file to my external USB harddisk
>> formatted with btrfs, when the kernel brutally lashed out with the BUG
>> below, preventing all further access to the disk:
>
> Is it possible that you filled up the disk?
I have heard that this is a difficult question to answer with btrfs. My
gut feeling is no, there should be plenty of space available. Here's
what btrfs says:
# btrfs filesystem df /mnt/backup/
Data, single: total=450.01GiB, used=437.52GiB
System, DUP: total=8.00MiB, used=60.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, DUP: total=3.00GiB, used=2.13GiB
Metadata, single: total=8.00MiB, used=0.00
# df -h /mnt/backup/
Filesystem Size Used Avail Use% Mounted on
/dev/dm-9 699G 442G 256G 64% /mnt/backup
# btrfs filesystem show /mnt/backup
Label: 'backup' uuid: 11443bd3-7e74-46cc-8140-c7fbb14f9669
Total devices 2 FS bytes used 439.20GiB
devid 1 size 465.76GiB used 455.04GiB path /dev/dm-9
devid 2 size 232.83GiB used 1.00GiB path /dev/mapper/usb_backup1
For what it's worth, the error occurred when overwriting a 21 GB file
with 'bar'.
Best,
-Nikolaus
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