On Tue, Mar 18, 2014 at 01:48:00PM +0630, chandan wrote: > The earlier patchset posted by Chandra Seethraman was to get 4k > blocksize to work with ppc64's 64k PAGE_SIZE. Are we talking about metadata block sizes or data block sizes? > The root node of "tree root" tree has 1957 bytes being written by > make_btrfs() (in btrfs-progs). Hence I chose to do 2k blocksize for > the initial subpagesize-blocksize work. So with this patchset the > supported blocksizes would be in the range 2k-64k. So it's metadata blocks, and in this case 2k looks like the only allowed size that's smaller than 4k, and thus can demonstrage sub-page size allocations. I'm not sure if this is limiting for potential future extensions of metadata structures that could be larger. 2k is ok for testing purposes, but I think a 4k-page machine will hardly use a smaller page size. The more that 16k metadata blocks are now default. -- 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
