refactored names; fixed return values for hard links service

code/Infrastructure/Verticals/Files/IHardLinkFileService.cs

@@ -0,0 +1,19 @@
+namespace Infrastructure.Verticals.Files;
+
+public interface IHardLinkFileService
+{
+    /// <summary>
+    /// Populates the inode counts for Unix and the file index counts for Windows.
+    /// Needs to be called before <see cref="GetHardLinkCount"/> to populate the inode counts.
+    /// </summary>
+    /// <param name="directoryPath">The root directory where to search for hardlinks.</param>
+    void PopulateFileCounts(string directoryPath);
+    
+    /// <summary>
+    /// Get the hardlink count of a file.
+    /// </summary>
+    /// <param name="filePath">File path.</param>
+    /// <param name="ignoreRootDir">Whether to ignore hardlinks found in the same root dir.</param>
+    /// <returns>-1 on error, 0 if there are no hardlinks and 1 otherwise.</returns>
+    long GetHardLinkCount(string filePath, bool ignoreRootDir);
+}