statfs: fixes for s390x+musl (#1835)

Author: selfisekai

src/sys/statfs.rs

@@ -51,7 +51,7 @@ pub struct Statfs(type_of_statfs);
 type fs_type_t = u32;
 #[cfg(target_os = "android")]
 type fs_type_t = libc::c_ulong;
-#[cfg(all(target_os = "linux", target_arch = "s390x"))]
+#[cfg(all(target_os = "linux", target_arch = "s390x", not(target_env = "musl")))]
 type fs_type_t = libc::c_uint;
 #[cfg(all(target_os = "linux", target_env = "musl"))]
 type fs_type_t = libc::c_ulong;
@@ -314,7 +314,7 @@ impl Statfs {
     }
 
     /// Optimal transfer block size
-    #[cfg(all(target_os = "linux", target_arch = "s390x"))]
+    #[cfg(all(target_os = "linux", target_arch = "s390x", not(target_env = "musl")))]
     pub fn optimal_transfer_size(&self) -> u32 {
         self.0.f_bsize
     }
@@ -367,7 +367,7 @@ impl Statfs {
 
     /// Size of a block
     // f_bsize on linux: https://github.com/torvalds/linux/blob/master/fs/nfs/super.c#L471
-    #[cfg(all(target_os = "linux", target_arch = "s390x"))]
+    #[cfg(all(target_os = "linux", target_arch = "s390x", not(target_env = "musl")))]
     pub fn block_size(&self) -> u32 {
         self.0.f_bsize
     }
@@ -440,7 +440,7 @@ impl Statfs {
     }
 
     /// Maximum length of filenames
-    #[cfg(all(target_os = "linux", target_arch = "s390x"))]
+    #[cfg(all(target_os = "linux", target_arch = "s390x", not(target_env = "musl")))]
     pub fn maximum_name_length(&self) -> u32 {
         self.0.f_namelen
     }