split mount into a library crate for rust reuse

update makefile to output shared library and rust build
fix default.nix to properly get the binary name for `ln`ing - move binary to main.rs
add rustfmt and gitignore files
move build.rs file into bch_bindgen for reuse between projects
add outputs to nix flake and checks
add mount.toml to makefile

11 files changed, 805 insertions, 0 deletions

diff --git a/rust-src/bch_bindgen/.gitignore b/rust-src/bch_bindgen/.gitignore
new file mode 100644
index 00000000..0aa133ac
--- /dev/null
+++ b/rust-src/bch_bindgen/.gitignore
@@ -0,0 +1,15 @@
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+# Required By Nix
+# Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
diff --git a/rust-src/bch_bindgen/Cargo.lock b/rust-src/bch_bindgen/Cargo.lock
new file mode 100644
index 00000000..2138d338
--- /dev/null
+++ b/rust-src/bch_bindgen/Cargo.lock
@@ -0,0 +1,484 @@
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+# It is not intended for manual editing.
+version = 3
+
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+
+[[package]]
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+ "bitfield",
+ "byteorder",
+ "gag",
+ "libc",
+ "memoffset",
+ "pkg-config",
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+ "tracing-attributes",
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+ "uuid",
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+ "rustc-hash",
+ "shlex",
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+ "winapi",
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+ "tracing-core",
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diff --git a/rust-src/bch_bindgen/Cargo.toml b/rust-src/bch_bindgen/Cargo.toml
new file mode 100644
index 00000000..91cc77fe
--- /dev/null
+++ b/rust-src/bch_bindgen/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+name = "bch_bindgen"
+version = "0.1.0"
+authors = [ "Kayla Firestack <dev@kaylafire.me>", "Yuxuan Shui <yshuiv7@gmail.com>" ]
+edition = "2018"
+
+[lib]
+crate-type = ["lib"]
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tracing = "0.1.26"
+anyhow = "1.0"
+udev = "0.4"
+uuid = "0.8"
+bitfield = "0.13"
+memoffset = "0.5"
+byteorder = "1.3"
+tracing-attributes = "0.1.15"
+libc = "0.2.69"
+gag = "1.0.0"
+
+
+[build-dependencies]
+pkg-config = "0.3"
+bindgen = { version = "0.59.1", default-features = false }
diff --git a/rust-src/bch_bindgen/build.rs b/rust-src/bch_bindgen/build.rs
new file mode 100644
index 00000000..fd570dbb
--- /dev/null
+++ b/rust-src/bch_bindgen/build.rs
@@ -0,0 +1,74 @@
+fn main() {
+	use std::path::PathBuf;
+	// use std::process::Command;
+
+	let out_dir: PathBuf = std::env::var_os("OUT_DIR").expect("ENV Var 'OUT_DIR' Expected").into();
+	let top_dir: PathBuf = std::env::var_os("CARGO_MANIFEST_DIR")
+		.expect("ENV Var 'CARGO_MANIFEST_DIR' Expected")
+		.into();
+	let libbcachefs_inc_dir =
+		std::env::var("LIBBCACHEFS_INCLUDE").unwrap_or_else(|_| top_dir.join("libbcachefs").display().to_string());
+	let libbcachefs_inc_dir = std::path::Path::new(&libbcachefs_inc_dir);
+	println!("{}", libbcachefs_inc_dir.display());
+
+	println!("cargo:rustc-link-lib=dylib=bcachefs");
+	println!("cargo:rustc-link-search={}", env!("LIBBCACHEFS_LIB"));
+
+	let _libbcachefs_dir = top_dir.join("libbcachefs").join("libbcachefs");
+	let bindings = bindgen::builder()
+		.header(top_dir.join("src").join("libbcachefs_wrapper.h").display().to_string())
+		.clang_arg(format!("-I{}", libbcachefs_inc_dir.join("include").display()))
+		.clang_arg(format!("-I{}", libbcachefs_inc_dir.display()))
+		.clang_arg("-DZSTD_STATIC_LINKING_ONLY")
+		.clang_arg("-DNO_BCACHEFS_FS")
+		.clang_arg("-D_GNU_SOURCE")
+		.derive_debug(true)
+		.derive_default(true)
+		.derive_eq(true)
+		.layout_tests(true)
+		.default_enum_style(bindgen::EnumVariation::Rust { non_exhaustive: true })
+		.allowlist_function(".*bch2_.*")
+		// .allowlist_function("bch2_read_super")
+		// .allowlist_function("bch2_sb_field_.*")
+		// .allowlist_function("bch2_super_write")
+		// .allowlist_function("bch2_chacha_encrypt_key")
+		// .allowlist_function("__bch2_super_read")
+		.allowlist_function("bio_.*")
+		.allowlist_function("bch2_super_write_fd")
+		.allowlist_function("derive_passphrase")
+		.allowlist_function("request_key")
+		.allowlist_function("add_key")
+		.allowlist_function("keyctl_search")
+		.blocklist_type("bch_extent_ptr")
+		.blocklist_type("btree_node")
+		.blocklist_type("bch_extent_crc32")
+		.blocklist_type("rhash_lock_head")
+		.blocklist_type("srcu_struct")
+		.allowlist_var("BCH_.*")
+		.allowlist_var("KEY_SPEC_.*")
+		.allowlist_type("bch_kdf_types")
+		.allowlist_type("bch_sb_field_.*")
+		.allowlist_type("bch_encrypted_key")
+		.allowlist_type("nonce")
+		.newtype_enum("bch_kdf_types")
+		.opaque_type("gendisk")
+		.opaque_type("bkey")
+		// .opaque_type("bch_extent_ptr")
+		// .opaque_type("bch_extent_crc32")
+		.opaque_type("open_bucket.*")
+		.generate()
+		.expect("BindGen Generation Failiure: [libbcachefs_wrapper]");
+	bindings
+		.write_to_file(out_dir.join("bcachefs.rs"))
+		.expect("Writing to output file failed for: `bcachefs.rs`");
+
+	let keyutils = pkg_config::probe_library("libkeyutils").expect("Failed to find keyutils lib");
+	let bindings = bindgen::builder()
+		.header(top_dir.join("src").join("keyutils_wrapper.h").display().to_string())
+		.clang_args(keyutils.include_paths.iter().map(|p| format!("-I{}", p.display())))
+		.generate()
+		.expect("BindGen Generation Failiure: [Keyutils]");
+	bindings
+		.write_to_file(out_dir.join("keyutils.rs"))
+		.expect("Writing to output file failed for: `keyutils.rs`");
+}
diff --git a/rust-src/bch_bindgen/rustfmt.toml b/rust-src/bch_bindgen/rustfmt.toml
new file mode 100644
index 00000000..a2b7f327
--- /dev/null
+++ b/rust-src/bch_bindgen/rustfmt.toml
@@ -0,0 +1,2 @@
+max_width=120
+hard_tabs = true
diff --git a/rust-src/bch_bindgen/src/bcachefs.rs b/rust-src/bch_bindgen/src/bcachefs.rs
new file mode 100644
index 00000000..cc98ffc1
--- /dev/null
+++ b/rust-src/bch_bindgen/src/bcachefs.rs
@@ -0,0 +1,124 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(unused)]
+
+include!(concat!(env!("OUT_DIR"), "/bcachefs.rs"));
+
+use bitfield::bitfield;
+bitfield! {
+	pub struct bch_scrypt_flags(u64);
+	pub N, _: 15, 0;
+	pub R, _: 31, 16;
+	pub P, _: 47, 32;
+}
+bitfield! {
+	pub struct bch_crypt_flags(u64);
+	pub TYPE, _: 4, 0;
+}
+use memoffset::offset_of;
+impl bch_sb_field_crypt {
+	pub fn scrypt_flags(&self) -> Option<bch_scrypt_flags> {
+		use std::convert::TryInto;
+		match bch_kdf_types(bch_crypt_flags(self.flags).TYPE().try_into().ok()?) {
+			bch_kdf_types::BCH_KDF_SCRYPT => Some(bch_scrypt_flags(self.kdf_flags)),
+			_ => None,
+		}
+	}
+	pub fn key(&self) -> &bch_encrypted_key {
+		&self.key
+	}
+}
+impl PartialEq for bch_sb {
+	fn eq(&self, other: &Self) -> bool {
+		self.magic.b == other.magic.b
+		&& self.user_uuid.b == other.user_uuid.b
+		&& self.block_size == other.block_size
+		&& self.version == other.version
+		&& self.uuid.b == other.uuid.b
+		&& self.seq == other.seq
+	}
+}
+
+impl std::fmt::Debug for bch_sb {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		f.debug_struct("bch_sb")
+			.field("uuid", &self.uuid())
+			.field("version", &(self.version, self.version_min))
+			.field("block_size", &self.block_size)
+			.field("device_idx", &self.dev_idx)
+			.field("seq", &self.seq)
+			.field("csum", &(self.csum.lo, self.csum.hi))
+			.field("offset", &self.offset)
+		.finish_non_exhaustive()
+    }
+}
+
+
+impl bch_sb {
+	pub fn crypt(&self) -> Option<&bch_sb_field_crypt> {
+		unsafe {
+			let ptr = bch2_sb_field_get(self as *const _ as *mut _, bch_sb_field_type::BCH_SB_FIELD_crypt) as *const u8;
+			if ptr.is_null() {
+				None
+			} else {
+				let offset = offset_of!(bch_sb_field_crypt, field);
+				Some(&*((ptr.sub(offset)) as *const _))
+			}
+		}
+	}
+	pub fn uuid(&self) -> uuid::Uuid {
+		uuid::Uuid::from_bytes(self.user_uuid.b)
+	}
+
+	/// Get the nonce used to encrypt the superblock
+	pub fn nonce(&self) -> nonce {
+		use byteorder::{LittleEndian, ReadBytesExt};
+		let mut internal_uuid = &self.uuid.b[..];
+		let dword1 = internal_uuid.read_u32::<LittleEndian>().unwrap();
+		let dword2 = internal_uuid.read_u32::<LittleEndian>().unwrap();
+		nonce {
+			d: [0, 0, dword1, dword2],
+		}
+	}
+}
+impl bch_sb_handle {
+	pub fn sb(&self) -> &bch_sb {
+		unsafe { &*self.sb }
+	}
+
+	pub fn bdev(&self) -> &block_device {
+		unsafe { &*self.bdev }
+	}
+}
+
+#[repr(C)]
+// #[repr(align(8))]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct bch_extent_ptr {
+	pub _bitfield_1: __BindgenBitfieldUnit<[u8; 8usize]>,
+}
+
+#[repr(C, packed(8))]
+pub struct btree_node {
+	pub csum: bch_csum,
+	pub magic: __le64,
+	pub flags: __le64,
+	pub min_key: bpos,
+	pub max_key: bpos,
+	pub _ptr: bch_extent_ptr,
+	pub format: bkey_format,
+	pub __bindgen_anon_1: btree_node__bindgen_ty_1,
+}
+
+#[repr(C, packed(8))]
+// #[repr(align(8))]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct bch_extent_crc32 {
+	pub _bitfield_1: __BindgenBitfieldUnit<[u8; 4usize]>,
+	pub csum: __u32,
+}
+
+// #[repr(u8)]
+pub enum rhash_lock_head {}
+pub enum srcu_struct {}
diff --git a/rust-src/bch_bindgen/src/keyutils.rs b/rust-src/bch_bindgen/src/keyutils.rs
new file mode 100644
index 00000000..30fc56f9
--- /dev/null
+++ b/rust-src/bch_bindgen/src/keyutils.rs
@@ -0,0 +1,6 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(unused)]
+
+include!(concat!(env!("OUT_DIR"), "/keyutils.rs"));
diff --git a/rust-src/bch_bindgen/src/keyutils_wrapper.h b/rust-src/bch_bindgen/src/keyutils_wrapper.h
new file mode 100644
index 00000000..857cee2e
--- /dev/null
+++ b/rust-src/bch_bindgen/src/keyutils_wrapper.h
@@ -0,0 +1 @@
+#include <keyutils.h>
diff --git a/rust-src/bch_bindgen/src/lib.rs b/rust-src/bch_bindgen/src/lib.rs
new file mode 100644
index 00000000..c19b5a2f
--- /dev/null
+++ b/rust-src/bch_bindgen/src/lib.rs
@@ -0,0 +1,7 @@
+pub mod bcachefs;
+pub mod keyutils;
+pub mod rs;
+
+pub mod c {
+	pub use crate::bcachefs::*;
+}
diff --git a/rust-src/bch_bindgen/src/libbcachefs_wrapper.h b/rust-src/bch_bindgen/src/libbcachefs_wrapper.h
new file mode 100644
index 00000000..2a0e7026
--- /dev/null
+++ b/rust-src/bch_bindgen/src/libbcachefs_wrapper.h
@@ -0,0 +1,8 @@
+#include "../libbcachefs/super-io.h"
+#include "../libbcachefs/checksum.h"
+#include "../libbcachefs/bcachefs_format.h"
+#include "../libbcachefs/opts.h"
+#include "../libbcachefs.h"
+#include "../crypto.h"
+#include "../include/linux/bio.h"
+
diff --git a/rust-src/bch_bindgen/src/rs.rs b/rust-src/bch_bindgen/src/rs.rs
new file mode 100644
index 00000000..4452f0b2
--- /dev/null
+++ b/rust-src/bch_bindgen/src/rs.rs
@@ -0,0 +1,58 @@
+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)
+}