On Fri, Mar 11, 2016 at 10:17:03PM +0000, Hugo Mills wrote: > I know I promised this a while ago and didn't get round to it, but > Henk's tinkering reminded me of it. I note specifically that the > algorithm used to give the free space to plain old df gives incorrect > results -- probably because it's not using the algorithm below.
So the algorithm is supposed to implement btrfs_calc_avail_data_space, the raid5/6 parts are missing from there, otherwise the structure of the function follows the proposed algorithm. > There is an algorithm that (seems to) give the correct number of > block groups which can be allocated, given a current allocation state > of the FS. I haven't been able to prove it correct, but it seems to > work. Here's some pseudocode for it: It does sound correct to me. Thanks for writing it up. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
