btrfs kernel oops and hot storage removing

btrfs kernel oops and hot storage removing

[Maksim 'max_posedon' Melnikau]

[-- Attachment #1: Type: text/plain, Size: 641 bytes --]

Hi!

I'm not subscribed to ML, so plz keep me in CC.

I'm running btrfs on my sheevaplug on storage attached via usb. I use
multi-device configuration for testing (use different partitions for
emulate this). I catched kernel oops on hot removing storage (without
umount/etc). First one was one device decide reboot themselves, second
when I manually turned it off and on.

Basically I don't expect correct btrfs working in such situation, but
as I know it designed to work correctly in raid configuration, so, may
be somebody expect better behavior even in such situation.

I attached 2 dmesg outputs(gzipped)

Maksim 'max_posedon' Melnikau

[-- Attachment #2: dmesg1.gz --]
[-- Type: application/x-gzip, Size: 7888 bytes --]

[-- Attachment #3: dmesg2.gz --]
[-- Type: application/x-gzip, Size: 7663 bytes --]

Re: btrfs kernel oops and hot storage removing

[Sander]

Hello Maksim,

Maksim 'max_posedon' Melnikau wrote (ao):
> I'm running btrfs on my sheevaplug on storage attached via usb. I use
> multi-device configuration for testing (use different partitions for
> emulate this). I catched kernel oops on hot removing storage (without
> umount/etc). First one was one device decide reboot themselves, second
> when I manually turned it off and on.
> 
> Basically I don't expect correct btrfs working in such situation, but
> as I know it designed to work correctly in raid configuration, so, may
> be somebody expect better behavior even in such situation.

You pull the entire raid array when removing the USB storage, as the
Sheevaplug has only one USB port. That will not work and it is not the
fault of btrfs :-)

	With kind regards, Sander

-- 
Humilis IT Services and Solutions
http://www.humilis.net