On Wed, Aug 15, 2012 at 11:02:31AM +0800, Liu Bo wrote:
> On 08/15/2012 10:48 AM, Marc MERLIN wrote:
> > On Tue, Aug 14, 2012 at 11:23:14AM -0700, Marc MERLIN wrote:
> >> My laptop oopsed due to a wireless bug
> >>
> >> When I rebooted, the system came back ok, and seemed to work, but soon went
> >> to read only with the error in the subject line.
> >>
> >> I have hourly snapshots for each of the 5 subvolumes in that btrfs
> >> filesystem.
> >>
> >> How do I recover from this? Revert all the snapshots one hour, find/guess
> >> which one caused the problem somehow and revert just that one? (the error
> >> message didn't give a subvolume or directory).
> >>
> >> Also, before I do this, is there debug info I can get off my system?
> >
> > I'm likely to have to do this tonight to get back to a working system.
> >
> > If someone wants debug info before I lose it potentially, please ask soon ;)
>
> What does the 'ret' shows? Is it -ENOSPC?
I got nothing else in my logs.
I powered the laptop back on and it came up like nothing ever happened.
[ 15.626700] device label btrfs_pool1 devid 1 transid 10222 /dev/mapper/cryptroot
[ 15.627161] btrfs: disk space caching is enabled
[ 15.631704] btrfs: bdev /dev/mapper/cryptroot errs: wr 0, rd 0, flush 0, corrupt 0, gen 0
It looks like the SSD was loose inside the laptop (the tray that holds it isn't quite the
right size it seems).
I think it may not have had a good connection, but what's interesting is that I
got absolutely no lower level errors in dmesg (which didn't get written to disk).
All that said, I think it may just have been a write error due to a hardware
connection problem (no way to prove this now).
If there is nothing suspicious in the code around that line, let's just ignore
my report.
For what it's worth, I do have plenty of space left:
Label: 'btrfs_pool1' uuid: 92584fa9-85cd-4df6-b182-d32198b76a0b
Total devices 1 FS bytes used 227.44GB
devid 1 size 441.70GB used 297.04GB path /dev/dm-0
Thanks for your reply.
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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