let disk_usage return StorageStatus and use it for datastores/nodes

disk_usage returned the same values as defined in StorageStatus,
so simply use that

with that we can replace the logic of the datastore status with that
function and also use it for root disk usage of the nodes

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/tools/disks.rs

@@ -19,7 +19,7 @@ use proxmox::sys::linux::procfs::{MountInfo, mountinfo::Device};
 use proxmox::{io_bail, io_format_err};
 use proxmox::api::api;
 
-use crate::api2::types::BLOCKDEVICE_NAME_REGEX;
+use crate::api2::types::{BLOCKDEVICE_NAME_REGEX, StorageStatus};
 
 mod zfs;
 pub use zfs::*;
@@ -511,7 +511,7 @@ impl Disk {
 }
 
 /// Returns disk usage information (total, used, avail)
-pub fn disk_usage(path: &std::path::Path) -> Result<(u64, u64, u64), Error> {
+pub fn disk_usage(path: &std::path::Path) -> Result<StorageStatus, Error> {
 
     let mut stat: libc::statfs64 = unsafe { std::mem::zeroed() };
 
@@ -522,7 +522,11 @@ pub fn disk_usage(path: &std::path::Path) -> Result<(u64, u64, u64), Error> {
 
     let bsize = stat.f_bsize as u64;
 
-    Ok((stat.f_blocks*bsize, (stat.f_blocks-stat.f_bfree)*bsize, stat.f_bavail*bsize))
+    Ok(StorageStatus{
+        total: stat.f_blocks*bsize,
+        used: (stat.f_blocks-stat.f_bfree)*bsize,
+        avail: stat.f_bavail*bsize,
+    })
 }
 
 #[api()]