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use libc;
use uuid;
use std::io;
use ctypes;
use ioctlwrapper;
use types::*;
pub fn get_filesystem_info (
file_descriptor: libc::c_int,
) -> Result <FilesystemInfo, String> {
let mut c_fs_info_args =
ctypes::IoctlFsInfoArgs::new ();
let get_fs_info_result =
unsafe {
ioctlwrapper::fs_info (
file_descriptor,
& mut c_fs_info_args as * mut ctypes::IoctlFsInfoArgs)
};
if get_fs_info_result != 0 {
return Err (
"Error getting btrfs filesystem information".to_string ()
);
}
Ok (
FilesystemInfo {
max_id:
c_fs_info_args.max_id,
num_devices:
c_fs_info_args.num_devices,
filesystem_id:
uuid::Uuid::from_bytes (
& c_fs_info_args.filesystem_id,
).unwrap (),
}
)
}
pub fn get_device_info (
file_descriptor: libc::c_int,
device_id: u64,
) -> Result <Option <DeviceInfo>, String> {
let mut c_dev_info_args =
ctypes::IoctlDevInfoArgs::new ();
c_dev_info_args.devid =
device_id;
let get_dev_info_result =
unsafe {
ioctlwrapper::dev_info (
file_descriptor,
& mut c_dev_info_args as * mut ctypes::IoctlDevInfoArgs)
};
if get_dev_info_result != 0 {
match io::Error::last_os_error ().raw_os_error () {
Some (libc::ENODEV) =>
Ok (None),
Some (errno) =>
Err (
format! (
"Os error {} getting device info",
errno)
),
None =>
Err (
"Unknown error getting device info".to_string (),
),
}
} else {
Ok (Some (
DeviceInfo {
device_id:
c_dev_info_args.devid,
uuid: uuid::Uuid::from_bytes (
& c_dev_info_args.uuid,
).unwrap (),
bytes_used:
c_dev_info_args.bytes_used,
total_bytes:
c_dev_info_args.total_bytes,
path:
c_dev_info_args.path.as_os_string (),
}))
}
}
pub fn get_device_infos (
file_descriptor: libc::c_int,
filesystem_info: & FilesystemInfo,
) -> Result <Vec <DeviceInfo>, String> {
let mut device_infos: Vec <DeviceInfo> =
vec! [];
for device_id in 0 .. filesystem_info.max_id + 1 {
let device_info_option =
try! (
get_device_info (
file_descriptor,
device_id));
if device_info_option.is_none () {
continue;
}
let device_info =
device_info_option.unwrap ();
device_infos.push (
device_info);
}
Ok (device_infos)
}