On Thu, Oct 23, 2014 at 09:24:48PM -0400, Zygo Blaxell wrote: > On Thu, Oct 23, 2014 at 05:28:58PM -0700, Robert White wrote: > > You may be in deep error land from the long use of 3.10... that > > said, the --init-csum-tree or --init-extent-tree options may be your > > friend here. The backtrace shows you are in "open_ctree" so the > > former is more likely the better bet. Alas, both fail: # btrfs check --repair --init-csum-tree --init-extent-tree /dev/mapper/md15 enabling repair mode Creating a new CRC tree Couldn't open file system Same result with each option individually, except that when --init-csum-tree is absent, so is the "Creating a new CRC tree" message. I'm also trying 'btrfs rescue chunk-recover -v' but so far it has read many gigabytes but not had much to say. (LVM snapshots + kvm = attack this filesystem with multiple tools at once :-)
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