On Tue, Oct 13, 2009 at 06:31:45AM -0400, Chris Mason wrote: > On Mon, Oct 12, 2009 at 03:09:35PM +0100, Hugo Mills wrote: > > On Sun, Oct 04, 2009 at 08:06:30AM -0400, Chris Mason wrote: > > > On Sat, Oct 03, 2009 at 05:55:32PM -0400, Josef Bacik wrote: > > > > On Sat, Oct 03, 2009 at 01:21:09PM +0100, Hugo Mills wrote: > > > > > I've just had the following on my home server. I believe that it's > > > > > btrfs that's responsible, as the machine wasn't doing much other than > > > > > reading/writing on a btrfs filesystem. The process that was doing so > > > > > is now stuck in D+ state, and can't be killed. The timing of the oops > > > > > at the end is also suggestive of being involved in the same incident. > > > > > This is the only btrfs filesystem on the machine. > > > > > > > > Patches have gone to Linus to fix the enospc problems. You can try running the > > > > enospc branch of Chris's git tree and it should behave better for you. Thanks, > > > > > > The right tree for this is the master branch of btrfs-unstable for > > > 2.6.31. > > > > Thanks, Josef and Chris. I've now found the time to check out and > > build the btrfs-unstable tree, and it is indeed handling the ENOSPC > > condition much more cleanly. > > > > However, it seems to have got into a position where I have lots of > > free space reported by df (over 10% of the size of the volume -- 185 > > GiB free of 1474 GiB total), but still refuses to write anything to > > the filesystem. Do you have any suggestions for what I could try? > > You've probably got most of that 10GB free allocated as metadata. You > could try btrfs-vol -b. I moved some 13 GiB of data off the filesystem, and ran btrfs-vol -b. As I reported on IRC, I then got this in my syslog: Oct 13 13:16:19 vlad kernel: btrfs: relocating block group 1401224691712 flags 1 Oct 13 13:17:02 vlad kernel: btrfs: found 123 extents Oct 13 13:17:10 vlad kernel: btrfs: found 123 extents Oct 13 13:17:11 vlad kernel: btrfs: found 28 extents Oct 13 13:17:21 vlad kernel: btrfs: found 28 extents Oct 13 13:17:25 vlad kernel: btrfs: found 28 extents Oct 13 13:17:26 vlad kernel: btrfs: found 27 extents Oct 13 13:17:36 vlad kernel: btrfs: found 27 extents Oct 13 13:17:39 vlad kernel: btrfs: found 27 extents Oct 13 13:17:48 vlad kernel: btrfs: found 27 extents ... repeat forever (or at least for 50 minutes or so). The btrfs-vol -b process didn't respond to ^C, so on advice of yanzheng on IRC I rebooted the machine. I'm currently running a btrfsck on the filesystem, and will try btrfs-vol -b again when that's done. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Do not meddle in the affairs of system administrators, for --- they are subtle, and quick to anger.
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