From: Li Dongyang <dongyang.li@anu.edu.au>
Date: Tue, 1 Mar 2016 05:36:49 +0000 (+1100)
Subject: LU-6215 llite: handle locks API change in 4.4+ kernels
X-Git-Tag: 2.8.51~18
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=dbaa768769a4075ca765dc76a138ef7a39c54eb0

LU-6215 llite: handle locks API change in 4.4+ kernels

Since 4.4 linux kernel replaced both posix_lock_file_wait() and
flock_lock_file_wait() by introducing locks_lock_file_wait().
This patch handles the API change.

Linux-commit: 4f6563677ae833baad8003e14353241bc25da4fc

Signed-off-by: Li Dongyang <dongyang.li@anu.edu.au>
Change-Id: I1b9c98c2afcad9da3fb377c3e788b12f20261e9e
Reviewed-on: http://review.whamcloud.com/18729
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
---

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index 00b376f..06a56fa 100644
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -1991,6 +1991,24 @@ cache_head_has_hlist, [
 ]) # LC_HAVE_CACHE_HEAD_HLIST
 
 #
+# LC_HAVE_LOCKS_LOCK_FILE_WAIT
+#
+# 4.4 kernel have moved locks API users to
+# locks_lock_inode_wait()
+#
+AC_DEFUN([LC_HAVE_LOCKS_LOCK_FILE_WAIT], [
+LB_CHECK_COMPILE([if 'locks_lock_file_wait' exists],
+locks_lock_file_wait, [
+	#include <linux/fs.h>
+],[
+	locks_lock_file_wait(NULL, NULL);
+],[
+	AC_DEFINE(HAVE_LOCKS_LOCK_FILE_WAIT, 1,
+		[kernel has locks_lock_file_wait])
+])
+]) # LC_HAVE_LOCKS_LOCK_FILE_WAIT
+
+#
 # LC_PROG_LINUX
 #
 # Lustre linux kernel checks
@@ -2155,6 +2173,9 @@ AC_DEFUN([LC_PROG_LINUX], [
 	# 4.3
 	LC_HAVE_CACHE_HEAD_HLIST
 
+	# 4.4
+	LC_HAVE_LOCKS_LOCK_FILE_WAIT
+
 	#
 	AS_IF([test "x$enable_server" != xno], [
 		LC_FUNC_DEV_SET_RDONLY
diff --git a/lustre/llite/file.c b/lustre/llite/file.c
index 8e6afbd..d1819c6 100644
--- a/lustre/llite/file.c
+++ b/lustre/llite/file.c
@@ -2918,6 +2918,11 @@ ll_file_flock(struct file *file, int cmd, struct file_lock *file_lock)
 	if (!(flags & LDLM_FL_TEST_LOCK))
 		file_lock->fl_type = fl_type;
 
+#ifdef HAVE_LOCKS_LOCK_FILE_WAIT
+	if ((rc == 0 || file_lock->fl_type == F_UNLCK) &&
+	    !(flags & LDLM_FL_TEST_LOCK))
+		rc2  = locks_lock_file_wait(file, file_lock);
+#else
         if ((file_lock->fl_flags & FL_FLOCK) &&
             (rc == 0 || file_lock->fl_type == F_UNLCK))
 		rc2  = flock_lock_file_wait(file, file_lock);
@@ -2925,6 +2930,7 @@ ll_file_flock(struct file *file, int cmd, struct file_lock *file_lock)
             (rc == 0 || file_lock->fl_type == F_UNLCK) &&
             !(flags & LDLM_FL_TEST_LOCK))
 		rc2  = posix_lock_file_wait(file, file_lock);
+#endif /* HAVE_LOCKS_LOCK_FILE_WAIT */
 
 	if (rc2 && file_lock->fl_type != F_UNLCK) {
 		einfo.ei_mode = LCK_NL;