bcachefs_ioctls/
lib.rs

1// Copyright 2025 James Taliaferro
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//   http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15mod ioctls;
16
17use anyhow::*;
18use uuid::Uuid;
19
20use std::{
21    ffi::CString,
22    fs,
23    os::{fd::AsRawFd, unix::ffi::OsStrExt},
24    path,
25};
26
27pub fn query_uuid(path: impl AsRef<path::Path>) -> Result<Uuid> {
28    let mut query_result: ioctls::QueryUuidPayload = Default::default();
29    unsafe { ioctls::query_uuid(fs::File::open(path)?.as_raw_fd(), &mut query_result)? };
30    Ok(Uuid::from_bytes(query_result.uuid))
31}
32
33enum SubvolOperation {
34    Create,
35    Destroy,
36    // Snapshot
37}
38
39fn do_subvolume_ioctl(path: impl AsRef<path::Path>, operation: SubvolOperation) -> Result<()> {
40    let path = std::path::absolute(path.as_ref())?;
41
42    let parent = path.parent().context("Path has no parent.")?;
43    let parent_handle = fs::File::open(parent)?;
44    let dst = CString::new(path.as_os_str().as_bytes())?;
45
46    let payload = ioctls::SubvolumePayload {
47        mode: 0o777,
48        dst_ptr: dst.as_ptr() as u64,
49        ..Default::default()
50    };
51
52    let parent_fd = parent_handle.as_raw_fd();
53
54    match operation {
55        SubvolOperation::Create => unsafe {
56            ioctls::subvolume_create(parent_fd, &payload)?;
57        },
58        SubvolOperation::Destroy => unsafe {
59            ioctls::subvolume_destroy(parent_fd, &payload)?;
60        },
61    }
62
63    Ok(())
64}
65
66pub fn create_subvolume(path: impl AsRef<path::Path>) -> Result<()> {
67    do_subvolume_ioctl(path, SubvolOperation::Create)
68}
69
70pub fn destroy_subvolume(path: impl AsRef<path::Path>) -> Result<()> {
71    do_subvolume_ioctl(path, SubvolOperation::Destroy)
72}
bcachefs_ioctls/lib.rs

bcachefs_ioctls/
lib.rs
