Hi Dong, Thanks for your reply. Then is it valid to access the memory space specified by that negative id? L Wan On Sun, Dec 1, 2013 at 10:31 PM, Dong Yuan <yuandong1222@xxxxxxxxx> wrote: > If my memory serves me well, negative id means buckets (root, room, > rack, cabinet, etc.), well positive means osds. > > On 2 December 2013 11:20, Lipeng Wan <lipengwan86@xxxxxxxxx> wrote: >> Hi guys, >> >> I am reading the source code of ceph and trying to understand the data >> structure of crush_map. Now I am confused by the use of "struct >> crush_bucket **buckets" in function "int crush_do_rule(...)" in >> src/crush/mapper.c. It seems that the index of array "map->buckets[]" >> could be negative (see line 551, src/crush/mapper.c). I was wondering >> if anyone could explain why the index of this array can be negative >> and how those buckets were added into this array. Thanks. >> >> Best, >> L. Wan >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > Dong Yuan > Email:yuandong1222@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
