ioctl$BTRFS_IOC_SUBVOL_SETFLAGS(0xffffffffffffffff, 0x4008941a, 0x0)
r0 = openat$sr(0xffffffffffffff9c, &(0x7f0000000440), 0x4840, 0x0)
ioctl$BLKPG(r0, 0x1269, &(0x7f0000000040))