On Thu, Jun 17, 2021 at 01:56:18PM +0900, Naohiro Aota wrote: > Consider we have a using block group on zoned btrfs. > > |<- ZU ->|<- used ->|<---free--->| > `- Alloc offset > ZU: Zone unusable > > Marking the block group read-only will migrate the zone unusable bytes > to the read-only bytes. So, we will have this. > > |<- RO ->|<- used ->|<--- RO --->| > RO: Read only > > When marking it back to read-write, btrfs_dec_block_group_ro() > subtracts the above "RO" bytes from the > space_info->bytes_readonly. And, it moves the zone unusable bytes back > and again subtracts those bytes from the space_info->bytes_readonly, > leading to negative bytes_readonly. > > This commit fixes the issue by reordering the operations. > > Link: https://github.com/naota/linux/issues/37 I've copied the 'fi df' output to changelog. > Fixes: 169e0da91a21 ("btrfs: zoned: track unusable bytes for zones") > Cc: stable@xxxxxxxxxxxxxxx # 5.12+ > Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx> Added to misc-next, thanks.
