From mboxrd@z Thu Jan 1 00:00:00 1970 From: rmk+kernel@arm.linux.org.uk (Russell King) Date: Fri, 11 Dec 2015 12:09:03 +0000 Subject: [PATCH] scripts: recordmcount: break hardlinks In-Reply-To: <20151202090517.432556a4@gandalf.local.home> References: <20151202090517.432556a4@gandalf.local.home> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org recordmcount edits the file in-place, which can cause problems when using ccache in hardlink mode. Arrange for recordmcount to break a hardlinked object. Signed-off-by: Russell King --- Steven, sorry it took a while to get this out... scripts/recordmcount.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 698768bdc581..91705ef30402 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -211,6 +211,20 @@ 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; } -- 2.1.0