From: Qu Wenruo wqu@suse.com
commit 0619b7901473c380abc05d45cf9c70bee0707db3 upstream.
It's not uncommon where __btrfs_dump_space_info() gets called under over-commit situations.
In that case free space would underflow as total allocated space is not enough to handle all the over-committed space.
Such underflow values can sometimes cause confusion for users enabled enospc_debug mount option, and takes some seconds for developers to convert the underflow value to signed result.
Just output the free space as s64 to avoid such problem.
Reported-by: Eli V eliventer@gmail.com Link: https://lore.kernel.org/linux-btrfs/CAJtFHUSy4zgyhf-4d9T+KdJp9w=UgzC2A0V=Vtm... CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Anand Jain anand.jain@oracle.com Signed-off-by: Qu Wenruo wqu@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/space-info.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -417,9 +417,10 @@ static void __btrfs_dump_space_info(stru { lockdep_assert_held(&info->lock);
- btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull", + /* The free space could be negative in case of overcommit */ + btrfs_info(fs_info, "space_info %llu has %lld free, is %sfull", info->flags, - info->total_bytes - btrfs_space_info_used(info, true), + (s64)(info->total_bytes - btrfs_space_info_used(info, true)), info->full ? "" : "not "); btrfs_info(fs_info, "space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu",