On 02.02.2012 05:31, Yan, Zheng wrote: > On Mon, Jan 30, 2012 at 6:03 PM, Jan Schmidt <list.btrfs@xxxxxxxxxxxxx> wrote: >> On 30.01.2012 07:33, Li Zefan wrote: >>> Jan Schmidt wrote: >>>> [...] >>> Unfortunately this is expected. The calculation is: >>> >>> extent_item.extent_data_ref.offset = file_pos - file_extent.extent_offset >>> >>> so you may get negative offset. >> >> I see where the negative offset comes from. But what can this offset be >> used for? >> > > The offset in backref isn't equal to the offset of the file extent, > it's just a hint for searching > file extents I see. Thanks for clarifying. And, Li: Thanks for bringing the old thread back to my mind. Nevertheless, that still seems quite a strange choice to me. Is there a deep sense behind it that is deeper than I'm currently looking? -Jan -- 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
