From: Liu Zheng <liuzheng@uniontech.com>
Date: Tue, 2 Jun 2026 06:26:28 +0000 (+0800)
Subject: hardlink: preserve timestamps when reflinking files
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1659125a2274492021ff91feee8a921f22921b28;p=thirdparty%2Futil-linux.git

hardlink: preserve timestamps when reflinking files

When using --reflink=always, the destination file gets the current
timestamp instead of preserving the original file's atime and mtime.
This differs from both hardlink behavior and "cp -p --reflink=always".

Add futimens() call after successful reflink to restore the original
timestamps from the target file's stat data.

Fixes #2340
---

diff --git a/misc-utils/hardlink.c b/misc-utils/hardlink.c
index bbfac951f..07be3e1af 100644
--- a/misc-utils/hardlink.c
+++ b/misc-utils/hardlink.c
@@ -701,6 +701,7 @@ static inline int do_link(struct file *a, struct file *b,
 {
 	if (reflink) {
 		int dest = -1, src = -1;
+		struct timespec times[2];
 
 		dest = open(new_name, O_CREAT|O_WRONLY|O_TRUNC, 0600);
 		if (dest < 0)
@@ -714,6 +715,10 @@ static inline int do_link(struct file *a, struct file *b,
 			goto fallback;
 		if (ioctl(dest, FICLONE, src) != 0)
 			goto fallback;
+		times[0] = b->st.st_atim;
+		times[1] = b->st.st_mtim;
+		if (futimens(dest, times) != 0)
+			goto fallback;
 		close(dest);
 		close(src);
 		return 0;