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use crate::bcachefs;
pub const SUPERBLOCK_MAGIC: uuid::Uuid =
uuid::Uuid::from_u128(0x_c68573f6_4e1a_45ca_8265_f57f48ba6d81);
extern "C" {
pub static stdout: *mut libc::FILE;
}
pub enum ReadSuperErr {
Io(std::io::Error),
}
type RResult<T> = std::io::Result<std::io::Result<T>>;
#[tracing_attributes::instrument(skip(opts))]
pub fn read_super_opts(
path: &std::path::Path,
mut opts: bcachefs::bch_opts,
) -> RResult<bcachefs::bch_sb_handle> {
// let devp = camino::Utf8Path::from_path(devp).unwrap();
use std::os::unix::ffi::OsStrExt;
let path = std::ffi::CString::new(path.as_os_str().as_bytes())?;
let mut sb = std::mem::MaybeUninit::zeroed();
// use gag::{BufferRedirect};
// // Stop libbcachefs from spamming the output
// let gag = BufferRedirect::stderr().unwrap();
// tracing::trace!("entering libbcachefs");
let ret =
unsafe { crate::bcachefs::bch2_read_super(path.as_ptr(), &mut opts, sb.as_mut_ptr()) };
tracing::trace!(%ret);
match -ret {
libc::EACCES => Err(std::io::Error::new(
std::io::ErrorKind::PermissionDenied,
"Access Permission Denied",
)),
0 => Ok(Ok(unsafe { sb.assume_init() })),
22 => Ok(Err(std::io::Error::new(
std::io::ErrorKind::InvalidData,
"Not a BCacheFS SuperBlock",
))),
code => {
tracing::debug!(msg = "BCacheFS return error code", ?code);
Ok(Err(std::io::Error::new(
std::io::ErrorKind::Other,
"Failed to Read SuperBlock",
)))
}
}
}
#[tracing_attributes::instrument]
pub fn read_super(path: &std::path::Path) -> RResult<bcachefs::bch_sb_handle> {
let opts = bcachefs::bch_opts::default(); //unsafe {std::mem::MaybeUninit::zeroed().assume_init()};
read_super_opts(path, opts)
}
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