From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 21 Aug 2025 12:27:05 +0000 (+0200)
Subject: stat-util: add helper inode_type_can_hardlink()
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=90fae0b46cd28bc43aa04874c16f12b230f8cd79;p=thirdparty%2Fsystemd.git

stat-util: add helper inode_type_can_hardlink()
---

diff --git a/src/basic/stat-util.h b/src/basic/stat-util.h
index 347d885a19f..17e712200a2 100644
--- a/src/basic/stat-util.h
+++ b/src/basic/stat-util.h
@@ -110,3 +110,10 @@ static inline bool stat_is_set(const struct stat *st) {
 static inline bool statx_is_set(const struct statx *sx) {
         return sx && sx->stx_mask != 0;
 }
+
+static inline bool inode_type_can_hardlink(mode_t m) {
+        /* returns true for all inode types that support hardlinks on linux. Note this is effectively all
+         * inode types except for directories (and those weird misc fds such as eventfds() that have no inode
+         * type). */
+        return IN_SET(m & S_IFMT, S_IFSOCK, S_IFLNK, S_IFREG, S_IFBLK, S_IFCHR, S_IFIFO);
+}