fix: Avoid double usage calculation on every restart (#8856)

On every restart of the server, usage was being
calculated which is not useful instead wait for
sufficient time to start the crawling routine.

This PR also avoids lots of double allocations
through strings, optimizes usage of string builders
and also avoids crawling through symbolic links.

Fixes #8844

cmd/posix-errors.go

@@ -58,6 +58,11 @@ func isSysErrTooLong(err error) bool {
 	return errors.Is(err, syscall.ENAMETOOLONG)
 }
 
+// Check if the given error corresponds to the ELOOP (too many symlinks).
+func isSysErrTooManySymlinks(err error) bool {
+	return errors.Is(err, syscall.ELOOP)
+}
+
 // Check if the given error corresponds to ENOTEMPTY for unix
 // and ERROR_DIR_NOT_EMPTY for windows (directory not empty).
 func isSysErrNotEmpty(err error) bool {