BTRFS_SPACE_INFO_GLOBAL_RSV 4173 fs/btrfs/ioctl.c 		space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
BTRFS_SPACE_INFO_GLOBAL_RSV  840 include/uapi/linux/btrfs_tree.h 					 BTRFS_SPACE_INFO_GLOBAL_RSV)