From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Fri, 11 Dec 2015 12:09:03 +0000 (+0000)
Subject: scripts: recordmcount: break hardlinks
X-Git-Url: https://git.stricted.de/?p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git;a=commitdiff_plain;h=76e33496d223ac180db393d42ce7915c3b45c0ff

scripts: recordmcount: break hardlinks

commit dd39a26538e37f6c6131e829a4a510787e43c783 upstream.

recordmcount edits the file in-place, which can cause problems when
using ccache in hardlink mode.  Arrange for recordmcount to break a
hardlinked object.

Link: http://lkml.kernel.org/r/E1a7MVT-0000et-62@rmk-PC.arm.linux.org.uk

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index e11aa4a156d..6faf6c654e8 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -194,6 +194,20 @@ static void *mmap_file(char const *fname)
 		addr = umalloc(sb.st_size);
 		uread(fd_map, addr, sb.st_size);
 	}
+	if (sb.st_nlink != 1) {
+		/* file is hard-linked, break the hard link */
+		close(fd_map);
+		if (unlink(fname) < 0) {
+			perror(fname);
+			fail_file();
+		}
+		fd_map = open(fname, O_RDWR | O_CREAT, sb.st_mode);
+		if (fd_map < 0) {
+			perror(fname);
+			fail_file();
+		}
+		uwrite(fd_map, addr, sb.st_size);
+	}
 	return addr;
 }