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|
extern "C" {
pub static stdout: *mut libc::FILE;
}
use getset::{CopyGetters, Getters};
use std::path::PathBuf;
#[derive(Getters, CopyGetters)]
pub struct FileSystem {
/// External UUID of the bcachefs
#[getset(get = "pub")]
uuid: uuid::Uuid,
/// Whether filesystem is encrypted
#[getset(get_copy = "pub")]
encrypted: bool,
/// Super block
#[getset(get = "pub")]
sb: bcachefs::bch_sb_handle,
/// Member devices for this filesystem
#[getset(get = "pub")]
devices: Vec<PathBuf>,
}
impl std::fmt::Debug for FileSystem {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("FileSystem")
.field("uuid", &self.uuid)
.field("encrypted", &self.encrypted)
.field("devices", &self.device_string())
.finish()
}
}
use std::fmt;
impl std::fmt::Display for FileSystem {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let devs = self.device_string();
write!(
f,
"{:?}: locked?={lock} ({}) ",
self.uuid,
devs,
lock = self.encrypted
)
}
}
impl FileSystem {
pub(crate) fn new(sb: bcachefs::bch_sb_handle) -> Self {
Self {
uuid: sb.sb().uuid(),
encrypted: sb.sb().crypt().is_some(),
sb: sb,
devices: Vec::new(),
}
}
pub fn device_string(&self) -> String {
use itertools::Itertools;
self.devices.iter().map(|d| d.display()).join(":")
}
pub fn mount(
&self,
target: impl AsRef<std::path::Path>,
options: impl AsRef<str>,
) -> anyhow::Result<()> {
tracing::info_span!("mount").in_scope(|| {
let src = self.device_string();
let (data, mountflags) = parse_mount_options(options);
// let fstype = c_str!("bcachefs");
tracing::info!(msg="mounting bcachefs filesystem", target=%target.as_ref().display());
mount_inner(src, target, "bcachefs", mountflags, data)
})
}
}
fn mount_inner(
src: String,
target: impl AsRef<std::path::Path>,
fstype: &str,
mountflags: u64,
data: Option<String>,
) -> anyhow::Result<()> {
use std::{
ffi::{c_void, CString},
os::{raw::c_char, unix::ffi::OsStrExt},
};
// bind the CStrings to keep them alive
let src = CString::new(src)?;
let target = CString::new(target.as_ref().as_os_str().as_bytes())?;
let data = data.map(CString::new).transpose()?;
let fstype = CString::new(fstype)?;
// convert to pointers for ffi
let src = src.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
let target = target.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
let data = data.as_ref().map_or(std::ptr::null(), |data| {
data.as_c_str().to_bytes_with_nul().as_ptr() as *const c_void
});
let fstype = fstype.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
let ret = {let _entered = tracing::info_span!("libc::mount").entered();
tracing::info!("mounting filesystem");
// REQUIRES: CAP_SYS_ADMIN
unsafe { libc::mount(src, target, fstype, mountflags, data) }
};
match ret {
0 => Ok(()),
_ => Err(crate::ErrnoError(errno::errno()).into()),
}
}
/// Parse a comma-separated mount options and split out mountflags and filesystem
/// specific options.
#[tracing_attributes::instrument(skip(options))]
fn parse_mount_options(options: impl AsRef<str>) -> (Option<String>, u64) {
use either::Either::*;
tracing::debug!(msg="parsing mount options", options=?options.as_ref());
let (opts, flags) = options
.as_ref()
.split(",")
.map(|o| match o {
"dirsync" => Left(libc::MS_DIRSYNC),
"lazytime" => Left(1 << 25), // MS_LAZYTIME
"mand" => Left(libc::MS_MANDLOCK),
"noatime" => Left(libc::MS_NOATIME),
"nodev" => Left(libc::MS_NODEV),
"nodiratime" => Left(libc::MS_NODIRATIME),
"noexec" => Left(libc::MS_NOEXEC),
"nosuid" => Left(libc::MS_NOSUID),
"ro" => Left(libc::MS_RDONLY),
"rw" => Left(0),
"relatime" => Left(libc::MS_RELATIME),
"strictatime" => Left(libc::MS_STRICTATIME),
"sync" => Left(libc::MS_SYNCHRONOUS),
"" => Left(0),
o @ _ => Right(o),
})
.fold((Vec::new(), 0), |(mut opts, flags), next| match next {
Left(f) => (opts, flags | f),
Right(o) => {
opts.push(o);
(opts, flags)
}
});
use itertools::Itertools;
(
if opts.len() == 0 {
None
} else {
Some(opts.iter().join(","))
},
flags,
)
}
use bch_bindgen::bcachefs;
use std::collections::HashMap;
use uuid::Uuid;
#[tracing_attributes::instrument]
pub fn probe_filesystems() -> anyhow::Result<HashMap<Uuid, FileSystem>> {
tracing::trace!("enumerating udev devices");
let mut udev = udev::Enumerator::new()?;
udev.match_subsystem("block")?; // find kernel block devices
let mut fs_map = HashMap::new();
let devresults =
udev.scan_devices()?
.into_iter()
.filter_map(|dev| dev.devnode().map(ToOwned::to_owned));
for pathbuf in devresults {
match get_super_block_uuid(&pathbuf)? {
Ok((uuid_key, superblock)) => {
let fs = fs_map.entry(uuid_key).or_insert_with(|| {
tracing::info!(msg="found bcachefs pool", uuid=?uuid_key);
FileSystem::new(superblock)
});
fs.devices.push(pathbuf);
},
Err(e) => { tracing::debug!(inner2_error=?e);}
}
}
tracing::info!(msg = "found filesystems", count = fs_map.len());
Ok(fs_map)
}
// #[tracing_attributes::instrument(skip(dev, fs_map))]
fn get_super_block_uuid(path: &std::path::Path) -> std::io::Result<std::io::Result<(Uuid, bcachefs::bch_sb_handle)>> {
let sb = bch_bindgen::rs::read_super(&path)?;
let super_block = match sb {
Err(e) => { return Ok(Err(e)); }
Ok(sb) => sb,
};
let uuid = (&super_block).sb().uuid();
tracing::debug!(found="bcachefs superblock", devnode=?path, ?uuid);
Ok(Ok((uuid, super_block)))
}
|
