2 use bch_bindgen::{bcachefs, bcachefs::bch_sb_handle, debug, error, info};
6 use std::path::PathBuf;
8 use crate::key::KeyLoc;
9 use std::ffi::{CStr, CString, OsStr, c_int, c_char, c_void};
10 use std::os::unix::ffi::OsStrExt;
14 target: impl AsRef<std::path::Path>,
18 ) -> anyhow::Result<()> {
20 // bind the CStrings to keep them alive
21 let src = CString::new(src)?;
22 let target = CString::new(target.as_ref().as_os_str().as_bytes())?;
23 let data = data.map(CString::new).transpose()?;
24 let fstype = CString::new(fstype)?;
26 // convert to pointers for ffi
27 let src = src.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
28 let target = target.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
29 let data = data.as_ref().map_or(std::ptr::null(), |data| {
30 data.as_c_str().to_bytes_with_nul().as_ptr() as *const c_void
32 let fstype = fstype.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
35 info!("mounting filesystem");
36 // REQUIRES: CAP_SYS_ADMIN
37 unsafe { libc::mount(src, target, fstype, mountflags, data) }
41 _ => Err(crate::ErrnoError(errno::errno()).into()),
45 /// Parse a comma-separated mount options and split out mountflags and filesystem
47 fn parse_mount_options(options: impl AsRef<str>) -> (Option<String>, u64) {
48 use either::Either::*;
49 debug!("parsing mount options: {}", options.as_ref());
50 let (opts, flags) = options
54 "dirsync" => Left(libc::MS_DIRSYNC),
55 "lazytime" => Left(1 << 25), // MS_LAZYTIME
56 "mand" => Left(libc::MS_MANDLOCK),
57 "noatime" => Left(libc::MS_NOATIME),
58 "nodev" => Left(libc::MS_NODEV),
59 "nodiratime" => Left(libc::MS_NODIRATIME),
60 "noexec" => Left(libc::MS_NOEXEC),
61 "nosuid" => Left(libc::MS_NOSUID),
62 "relatime" => Left(libc::MS_RELATIME),
63 "remount" => Left(libc::MS_REMOUNT),
64 "ro" => Left(libc::MS_RDONLY),
66 "strictatime" => Left(libc::MS_STRICTATIME),
67 "sync" => Left(libc::MS_SYNCHRONOUS),
71 .fold((Vec::new(), 0), |(mut opts, flags), next| match next {
72 Left(f) => (opts, flags | f),
79 use itertools::Itertools;
84 Some(opts.iter().join(","))
92 target: impl AsRef<std::path::Path>,
93 options: impl AsRef<str>,
94 ) -> anyhow::Result<()> {
95 let (data, mountflags) = parse_mount_options(options);
98 "mounting bcachefs filesystem, {}",
99 target.as_ref().display()
101 mount_inner(device, target, "bcachefs", mountflags, data)
104 fn read_super_silent(path: &std::path::PathBuf) -> anyhow::Result<bch_sb_handle> {
105 // Stop libbcachefs from spamming the output
106 let _gag = gag::BufferRedirect::stdout().unwrap();
108 bch_bindgen::rs::read_super(&path)
111 fn get_devices_by_uuid(uuid: Uuid) -> anyhow::Result<Vec<(PathBuf, bch_sb_handle)>> {
112 debug!("enumerating udev devices");
113 let mut udev = udev::Enumerator::new()?;
115 udev.match_subsystem("block")?;
120 .filter_map(|dev| dev.devnode().map(ToOwned::to_owned))
121 .map(|dev| (dev.clone(), read_super_silent(&dev)))
122 .filter_map(|(dev, sb)| sb.ok().map(|sb| (dev, sb)))
123 .filter(|(_, sb)| sb.sb().uuid() == uuid)
128 /// Mount a bcachefs filesystem by its UUID.
129 #[derive(Parser, Debug)]
130 #[command(author, version, about, long_about = None)]
132 /// Where the password would be loaded from.
134 /// Possible values are:
135 /// "fail" - don't ask for password, fail if filesystem is encrypted;
136 /// "wait" - wait for password to become available before mounting;
137 /// "ask" - prompt the user for password;
138 #[arg(short, long, default_value = "ask", verbatim_doc_comment)]
139 key_location: KeyLoc,
141 /// Device, or UUID=<UUID>
144 /// Where the filesystem should be mounted. If not set, then the filesystem
145 /// won't actually be mounted. But all steps preceeding mounting the
146 /// filesystem (e.g. asking for passphrase) will still be performed.
147 mountpoint: std::path::PathBuf,
150 #[arg(short, default_value = "")]
153 /// Force color on/off. Default: autodetect tty
154 #[arg(short, long, action = clap::ArgAction::Set, default_value_t=atty::is(Stream::Stdout))]
158 #[arg(short, long, action = clap::ArgAction::Count)]
162 fn cmd_mount_inner(opt: Cli) -> anyhow::Result<()> {
163 let (devs, sbs) = if opt.dev.starts_with("UUID=") {
164 let uuid = opt.dev.replacen("UUID=", "", 1);
165 let uuid = Uuid::parse_str(&uuid)?;
166 let devs_sbs = get_devices_by_uuid(uuid)?;
168 let devs_strs: Vec<_> = devs_sbs.iter().map(|(dev, _)| dev.clone().into_os_string().into_string().unwrap()).collect();
169 let devs_str = devs_strs.join(":");
170 let sbs = devs_sbs.iter().map(|(_, sb)| *sb).collect();
174 let mut sbs = Vec::new();
176 for dev in opt.dev.split(':') {
177 let dev = PathBuf::from(dev);
178 sbs.push(bch_bindgen::rs::read_super(&dev)?);
184 if unsafe { bcachefs::bch2_sb_is_encrypted(sbs[0].sb) } {
188 .ok_or_else(|| anyhow::anyhow!("no keyoption specified for locked filesystem"))?;
190 key::prepare_key(&sbs[0], key)?;
193 mount(devs, &opt.mountpoint, &opt.options)?;
198 pub extern "C" fn cmd_mount(argc: c_int, argv: *const *const c_char) {
199 let argv: Vec<_> = (0..argc)
200 .map(|i| unsafe { CStr::from_ptr(*argv.add(i as usize)) })
201 .map(|i| OsStr::from_bytes(i.to_bytes()))
204 let opt = Cli::parse_from(argv);
205 bch_bindgen::log::set_verbose_level(opt.verbose + bch_bindgen::log::ERROR);
206 colored::control::set_override(opt.colorize);
207 if let Err(e) = cmd_mount_inner(opt) {
208 error!("Fatal error: {}", e);