btrfs-vol -b endless loop

btrfs-vol -b endless loop

[Pär Andersson]

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Hi,

I have a 11G btrfs file system where "btrfs-vol -b" get stuck in a
loop. The "found 7 extents" messages and heavy disk io continues until I
reboot:

[26223.544037] btrfs: relocating block group 42079027200 flags 36
[26228.082740] btrfs: found 2457 extents
[26228.104515] btrfs: relocating block group 41407938560 flags 1
[26228.423981] btrfs: found 124 extents
[26229.514583] btrfs: found 124 extents
[26229.544160] btrfs: found 7 extents
[26229.812494] btrfs: found 7 extents
[26230.453720] btrfs: found 7 extents
[26230.733233] btrfs: found 7 extents
[26231.383321] btrfs: found 7 extents
[26231.652815] btrfs: found 7 extents
...

The error is repeatable. btrfsck does not report any errors:

root@faran:~# btrfsck /dev/sda5
found 9035055104 bytes used err is 0
total csum bytes: 8293152
total tree bytes: 542867456
total fs tree bytes: 503087104
btree space waste bytes: 108089491
file data blocks allocated: 8492187648
 referenced 10314125312
Btrfs Btrfs v0.19

The kernel is Linus' master from two days ago, and seems to have all the
latest btrfs code merged.

Regards,
Pär Andersson

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Re: btrfs-vol -b endless loop

[Yan, Zheng]

On Thu, Feb 4, 2010 at 6:25 AM, P=E4r Andersson <paran@lysator.liu.se> =
wrote:
> Hi,
>
> I have a 11G btrfs file system where "btrfs-vol -b" get stuck in a
> loop. The "found 7 extents" messages and heavy disk io continues unti=
l I
> reboot:
>
> [26223.544037] btrfs: relocating block group 42079027200 flags 36
> [26228.082740] btrfs: found 2457 extents
> [26228.104515] btrfs: relocating block group 41407938560 flags 1
> [26228.423981] btrfs: found 124 extents
> [26229.514583] btrfs: found 124 extents
> [26229.544160] btrfs: found 7 extents
> [26229.812494] btrfs: found 7 extents
> [26230.453720] btrfs: found 7 extents
> [26230.733233] btrfs: found 7 extents
> [26231.383321] btrfs: found 7 extents
> [26231.652815] btrfs: found 7 extents
> ...
>
> The error is repeatable. btrfsck does not report any errors:
>
> root@faran:~# btrfsck /dev/sda5
> found 9035055104 bytes used err is 0
> total csum bytes: 8293152
> total tree bytes: 542867456
> total fs tree bytes: 503087104
> btree space waste bytes: 108089491
> file data blocks allocated: 8492187648
> =A0referenced 10314125312
> Btrfs Btrfs v0.19
>
> The kernel is Linus' master from two days ago, and seems to have all =
the
> latest btrfs code merged.
>

The loop is due to fragments of free space. I'm working on make 'btrfs-=
vol -b'
return -ENOSPC in this case.

Yan, Zheng
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Re: btrfs-vol -b endless loop

[Pär Andersson]

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"Yan, Zheng " <yanzheng@21cn.com> writes:

> The loop is due to fragments of free space. I'm working on make 'btrfs-vol -b'
> return -ENOSPC in this case.

If I remember correctly the filesystem had 3G free space according to
df, which I know is not reliable on btrfs.

After removing one 540M file 'btrfs-vol -b' ran successfully.

Thanks,
Pär

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