Re: tree root

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On Wed, Oct 03, 2012 at 06:35:00PM +0200, Øystein Sættem Middelthun wrote:
> Well block 14102764707840 seems great, but generation doesn't match,
> have=109268, want=109269
> 
> Because the filesystem was last in use with a pre 3.2-kernel I am unable to
> use mount -o recovery, but restore seems to work when I specify the previous
> tree-root. My problem is however that the btrfs is so large I have nowhere
> to temporarily put all the files. I am currently running kernel 3.5. Does
> mount have an option to manually tell it to use the tree root at block
> 14102764707840?

It's not possible to supply the tree_root via mount option, but it
should be possible to modify the superblock to point the tree_root to
the one you've found, in a similar way that the -o recovery does that,
but this hasn't been done before and "minor" details may make it
complicated (like getting the transaction number in sync, as the
tree_root has latest-1).


david
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