[PATCH 3.4 090/125] scripts: recordmcount: break hardlinks

[lizf]

From: Russell King 

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

--


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-et...@rmk-pc.arm.linux.org.uk

Signed-off-by: Russell King 
Signed-off-by: Steven Rostedt 
Signed-off-by: Zefan Li 
---
 scripts/recordmcount.c | 14 ++
 1 file changed, 14 insertions(+)

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index ee52cb8..4eb047a 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;
 }
 
-- 
1.9.1

[PATCH 3.4 090/125] scripts: recordmcount: break hardlinks

[lizf]

From: Russell King 

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

--


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-et...@rmk-pc.arm.linux.org.uk

Signed-off-by: Russell King 
Signed-off-by: Steven Rostedt 
Signed-off-by: Zefan Li 
---
 scripts/recordmcount.c | 14 ++
 1 file changed, 14 insertions(+)

diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index ee52cb8..4eb047a 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;
 }
 
-- 
1.9.1