On 17.07.2012 21:25, Arne Jansen wrote: > On 07/17/2012 08:33 PM, Alex Lyakas wrote: >> extent? Also, how do we encounter roots (which is what we need in the >> output) during this walking? Hope you can shed some light, or you can > > iirc the root backreferences itself, which is the criterion that we > found a root.
As all the backref walking code, this differs between shared backrefs and indirect backrefs, too. In general, the criterion is: We've got a backref with a positive refcount, we've got a root id set for it, and we determined that this block has no parent block. See where find_parent_nodes adds to the "roots" ulist. >> let me continue digging in the code:) Please do so :-) -Jan -- 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
