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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-12-11 15:09:03 +0300
committerZefan Li <lizefan@huawei.com>2016-10-26 18:15:38 +0300
commit38b8ae4f5e4e766b206950a978f9a9051d55318a (patch)
tree977f240207f0a005d50990346cd573e6cd2800d4
parent1b17302a80d89c84ea3bdf7205ae363b7c12e3b7 (diff)
downloadlinux-38b8ae4f5e4e766b206950a978f9a9051d55318a.tar.xz
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: Zefan Li <lizefan@huawei.com>
-rw-r--r--scripts/recordmcount.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index ee52cb8e17ad..4eb047a71f6d 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -182,6 +182,20 @@ 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;
}