On Wed, Mar 30, 2016 at 03:00:19PM +0800, Qu Wenruo wrote: > Marc Haber wrote on 2016/03/29 08:43 +0200: > >On Mon, Mar 28, 2016 at 03:35:32PM -0400, Austin S. Hemmelgarn wrote: > >>Did you convert this filesystem from ext4 (or ext3)? > > > >No. > > > >>You hadn't mentioned what version of btrfs-progs you're using, and that is > >>somewhat important for recovery. I'm not sure if current versions of btrfs > >>check can fix this issue, but I know for a fact that older versions (prior > >>to at least 4.1) can not fix it. > > > >4.1 for creation and btrfs check. > > I assume that you have run older kernel on it, like v4.1 or v4.2.
No, the productive system was always on a reasonably recent kernel. I guess that this instance of btrfs has never been mounted on anything older than 4.4.4. The rescue system I used to btrfs check (4.4-1 from Debian unstable, I updated btrfs-tools on the rescue system before going btrfs check) had kernel 3.16, but I have never actually mounted the btrfs there. > >Then btrfs check is a userspace-only matter, as it wants the fs > >unmounted, and it is irrelevant that I did btrfs check from a rescue > >system with an older kernel, 3.16 if I recall correctly. > > Not recommended to use older kernel to RW mount or use older fsck to do > repair. Oldest kernel that has mounted this btrfs is 4.4.4, fsck that touched the fs is 4.4. I'm trying to get hold of btrfs-tools 4.5. > >My "productive" desktops (fan is one of them) run Debian unstable with > >a current vanilla kernel. At the moment, I can't use 4.5 because it > >acts up with KVM. When I need a rescue system, I use grml, which > >unfortunately hasn't released since November 2014 and is still with > >kernel 3.16 > > To fix your problem(make these error message just disappear, even they are > harmless on recent kernels), the most easy one, is to balance your metadata. This does not work on kernel 4.4.6 with tools 4.4. Truckloads of kernel traces, "WARNING: CPU: 5 PID: 31021 at fs/btrfs/extent-tree.c:7897 btrfs_alloc_tree_block+0xeb/0x3d6 [btrfs]()", "BTRFS: block rsv returned -28", full trace is in this thread. Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402 Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
