* 'bad tree block start' mount failure...
@ 2012-03-20 15:43 Daniel J Blueman
2012-03-20 16:16 ` Andrea Gelmini
0 siblings, 1 reply; 3+ messages in thread
From: Daniel J Blueman @ 2012-03-20 15:43 UTC (permalink / raw)
To: Linux BTRFS; +Cc: Chris Mason
Booting linux 3.3, I found a particular set of steps [1] produces an
fs which is unmountable [2]. This also occurs when data is written
after mounting, so is entirely possible to hit in practice if RAID-0
is used.
Many thanks,
Daniel
--- [1]
mkfs.btrfs -m raid0 -d raid0 /dev/sdb1 /dev/sdc1
mount /dev/sdb1 /mnt
umount /mnt
mount /dev/sdb1 /mnt -o compress
umount /mnt
mount /dev/sdb1 /mnt -o ssd
umount /mnt
mount /dev/sdb1 /mnt -o discard
umount /mnt
mount /dev/sdb1 /mnt
<mount failure>
--- [2]
[13259.593809] btrfs bad tree block start 0 37715968
[13259.593832] btrfs: failed to read tree root on sdc1
[13259.594221] btrfs: open_ctree failed
--
Daniel J Blueman
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 'bad tree block start' mount failure...
2012-03-20 15:43 'bad tree block start' mount failure Daniel J Blueman
@ 2012-03-20 16:16 ` Andrea Gelmini
2012-03-21 10:19 ` Daniel J Blueman
0 siblings, 1 reply; 3+ messages in thread
From: Andrea Gelmini @ 2012-03-20 16:16 UTC (permalink / raw)
To: Daniel J Blueman; +Cc: Linux BTRFS, Chris Mason
2012/3/20 Daniel J Blueman <daniel@quora.org>:
> mkfs.btrfs -m raid0 -d raid0 /dev/sdb1 /dev/sdc1
> mount /dev/sdb1 /mnt
> umount /mnt
> mount /dev/sdb1 /mnt -o compress
> umount /mnt
> mount /dev/sdb1 /mnt -o ssd
> umount /mnt
> mount /dev/sdb1 /mnt -o discard
> umount /mnt
> mount /dev/sdb1 /mnt
> <mount failure>
Well, I can't reproduce this. It's also true that I use some
out-of-the-tree patches.
I wrote this each step. They must be in a script?
Ciao,
Gelma
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 'bad tree block start' mount failure...
2012-03-20 16:16 ` Andrea Gelmini
@ 2012-03-21 10:19 ` Daniel J Blueman
0 siblings, 0 replies; 3+ messages in thread
From: Daniel J Blueman @ 2012-03-21 10:19 UTC (permalink / raw)
To: Andrea Gelmini; +Cc: Linux BTRFS, Chris Mason
On 21 March 2012 00:16, Andrea Gelmini <andrea.gelmini@gmail.com> wrote:
> 2012/3/20 Daniel J Blueman <daniel@quora.org>:
>> mkfs.btrfs -m raid0 -d raid0 /dev/sdb1 /dev/sdc1
>> mount /dev/sdb1 /mnt
>> umount /mnt
>> mount /dev/sdb1 /mnt -o compress
>> umount /mnt
>> mount /dev/sdb1 /mnt -o ssd
>> umount /mnt
>> mount /dev/sdb1 /mnt -o discard
>> umount /mnt
>> mount /dev/sdb1 /mnt
>> <mount failure>
>
> Well, I can't reproduce this. It's also true that I use some
> out-of-the-tree patches.
> I wrote this each step. They must be in a script?
I can reproduce this booting with the ubuntu 3.3 mainline kernel with
eg 'ramdisk_size=2048000' and then:
# mkfs.btrfs -m raid0 -d raid0 /dev/ram0 /dev/ram1
# mount /dev/ram0 /mnt
# umount /mnt
# mount /dev/ram0 /mnt -o compress
# umount /mnt
# mount /dev/ram0 /mnt -o ssd
# umount /mnt
# mount /dev/ram0 /mnt -o discard
# umount /mnt
# mount /dev/ram0 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/ram0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
Thanks,
Daniel
--
Daniel J Blueman
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-03-20 16:16 ` Andrea Gelmini
2012-03-21 10:19 ` Daniel J Blueman
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