From 099e9d4f2c57fba73d62db6764e09644636cbbc2 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 11 Dec 2015 12:09:03 +0000 Subject: [PATCH] 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 Signed-off-by: Steven Rostedt Signed-off-by: Greg Kroah-Hartman --- scripts/recordmcount.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 9c22317778eb..ee625e3a56ba 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -189,6 +189,20 @@ 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; }