Use filesystem name mapping on FreeBSD (#105417)

src/native/libs/System.Native/pal_io.c

@@ -1575,7 +1575,7 @@ static int16_t ConvertLockType(int16_t managedLockType)
     }
 }
 
-#if !HAVE_NON_LEGACY_STATFS || defined(__APPLE__)
+#if !HAVE_NON_LEGACY_STATFS || defined(TARGET_APPLE) || defined(TARGET_FREEBSD)
 static uint32_t MapFileSystemNameToEnum(const char* fileSystemName)
 {
     uint32_t result = 0;
@@ -1722,8 +1722,11 @@ uint32_t SystemNative_GetFileSystemType(intptr_t fd)
     while ((statfsRes = fstatfs(ToFileDescriptor(fd), &statfsArgs)) == -1 && errno == EINTR) ;
     if (statfsRes == -1) return 0;
 
-#if defined(__APPLE__)
-    // On OSX-like systems, f_type is version-specific. Don't use it, just map the name.
+#if defined(TARGET_APPLE) || defined(TARGET_FREEBSD)
+    // * On OSX-like systems, f_type is version-specific. Don't use it, just map the name.
+    // * Specifically, on FreeBSD with ZFS, f_type may return a value like 0xDE when emulating
+    //   FreeBSD on macOS (e.g., FreeBSD-x64 on macOS ARM64). Therefore, we use f_fstypename to
+    //   get the correct filesystem type.
     return MapFileSystemNameToEnum(statfsArgs.f_fstypename);
 #else
     // On Linux, f_type is signed. This causes some filesystem types to be represented as