On 10/09/2013 04:03 PM, Anand Jain wrote: > Wang, > > >> 1. First to search inline extent_data >> 2. Secondly search in extent tree to calculate (extent refs=1) > but these extents will be of entire fs, how do you filter it for a subvol ? Sorry, this could not be true as i have expected,(we have to iterate extent tree with my approach) If we considered both metadata and data for a subvolume, we just iterate all the extent items in the extent tree and add those extents into subvolume's sole size iff: 1> extent ref=1 2> backref root=subvol However, this also may come very *slowly* when extent tree comes very large. Thanks, Wang > > > Thanks, Anand > >> This will avoid n*n rather than n+n which is better… > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
