[Ocfs2-devel] [PATCH 09/30] ocfs2: Add helper inc_nlink

[Sunil Mushran]

Commit d8c76e6f45c111c32a4b3e50a2adc9210737b0d8 in mainline introduced
helper inc_nlink(). This patch allows one to build ocfs2 with kernels
having/not having that change.

Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>
---
 Makefile                        |    3 ++-
 configure.in                    |    5 +++++
 kapi-compat/include/inc_nlink.h |   19 +++++++++++++++++++
 3 files changed, 26 insertions(+), 1 deletions(-)
 create mode 100644 kapi-compat/include/inc_nlink.h

diff --git a/Makefile b/Makefile
index 088d0e1..1595b90 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,8 @@ KAPI_COMPAT_FILES = \
 	kapi-compat/include/compiler.h \
 	kapi-compat/include/highmem.h \
 	kapi-compat/include/fpath.h \
-	kapi-compat/include/kmod.h
+	kapi-compat/include/kmod.h \
+	kapi-compat/include/inc_nlink.h
 
 PATCH_FILES =
 
diff --git a/configure.in b/configure.in
index 94937cd..554a0a4 100644
--- a/configure.in
+++ b/configure.in
@@ -188,6 +188,11 @@ OCFS2_CHECK_KERNEL([enum umh_wait in kmod.h], kmod.h,
   , kmod_compat_header="kmod.h", [umh_wait])
 KAPI_COMPAT_HEADERS="$KAPI_COMPAT_HEADERS $kmod_compat_header"
 
+inc_nlink_compat_header=""
+OCFS2_CHECK_KERNEL([inc_nlink() in fs.h], fs.h,
+  , inc_nlink_compat_header="inc_nlink.h", [^static inline void inc_nlink(])
+KAPI_COMPAT_HEADERS="$KAPI_COMPAT_HEADERS $inc_nlink_compat_header"
+
 # using -include has two advantages:
 #  the source doesn't need to know to include compat headers
 #  the compat header file names don't go through the search path
diff --git a/kapi-compat/include/inc_nlink.h b/kapi-compat/include/inc_nlink.h
new file mode 100644
index 0000000..26ddaac
--- /dev/null
+++ b/kapi-compat/include/inc_nlink.h
@@ -0,0 +1,19 @@
+#ifndef KAPI_INC_NLINK_H
+#define KAPI_INC_NLINK_H
+
+#include <linux/fs.h>
+
+/*
+ * inc_nlink - directly increment an inode's link count
+ * @inode: inode
+ *
+ * This is a low-level filesystem helper to replace any
+ * direct filesystem manipulation of i_nlink.  Currently,
+ * it is only here for parity with dec_nlink().
+ */
+static inline void inc_nlink(struct inode *inode)
+{
+	inode->i_nlink++;
+}
+
+#endif
-- 
1.5.2.5