On Tue, Oct 30, 2012 at 04:20:05PM +0100, Gábor Nyers wrote: > Hi, > > How could one find out if 2 files share any extents on a btrfs file system? > > A more generic variation of the above: How to list files on the same > file system/subvolume sharing content? You have direct (read-only) access to the metadata trees through the TREE_SEARCH ioctl. It should be possible to walk through the extents of a given file, and (I think) follow back-refs from the extent back to the other files that share it. There's no simple code to do that right now, though. 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 --- And what rough beast, its hour come round at last / slouches --- towards Bethlehem, to be born?
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