On Tue, 24 Mar 2020 19:03:30 +0800 Qu Wenruo quwenruo.btrfs@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.