On Tue, 24 Mar 2020 19:03:30 +0800 Qu Wenruo <quwenruo.bt...@gmx.com> wrote:
> Sorry for the delayed reply. (Stupid filter setup). > > Currently most Uboot boards should use the same page size setup for its > kernel, and most btrfs uses 4K sector size. > > So for Uboot it should be no problem. > > Although the best practice is to read the fs_info::sectorsize as David > mentioned, but the code base doesn't allow us to do that yet. > > So I'm going to backport the read part code from btrfs-progs in the > near-future, and completely solve it, making it sector size independent. > > Would this plan looks sound? Or we need to wait for the full > re-implementation? > > Thanks, > Qu > The situation is Linux is such that btrfs sectorsize must be same as PAGE_SIZE, otherwise the Linux btrfs driver won't work. AFAIK there are only few architectures where PAGE_SIZE is not 4 KiB. btrfs filesystems created there cannot be mounted on systems with PAGE_SIZE = 4 KiB. I don't know if U-Boot is used on non 4KiB PAGE_SIZE boards. If it is, it should be solved, but I would check that before complicating the code.