+ AC_DEFINE(HAVE_D_COMPARE_7ARGS, 1,
+ [d_compare need 7 arguments])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.38 dentry_operations.d_delete() defined 'const' for 1st parameter.
+#
+AC_DEFUN([LC_D_DELETE_CONST],
+[AC_MSG_CHECKING([if d_delete has const declare on first parameter])
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_LINUX_TRY_COMPILE([
+ #include <linux/dcache.h>
+],[
+ const struct dentry *d = NULL;
+ ((struct dentry_operations*)0)->d_delete(d);
+],[
+ AC_DEFINE(HAVE_D_DELETE_CONST, const,
+ [d_delete first parameter declared const])
+ AC_MSG_RESULT([yes])
+],[
+ AC_DEFINE(HAVE_D_DELETE_CONST, , [])
+ AC_MSG_RESULT([no])
+])
+EXTRA_KCFLAGS="$tmp_flags"
+])
+
+#
+# 2.6.38 dcache_lock removed. rcu-walk commited.
+#
+AC_DEFUN([LC_DCACHE_LOCK],
+[AC_MSG_CHECKING([if dcache_lock is exist])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/dcache.h>
+],[
+ spin_lock(&dcache_lock);
+],[
+ AC_DEFINE(HAVE_DCACHE_LOCK, 1,
+ [dcache_lock is exist])
+ AC_MSG_RESULT([yes])
+],[
+ AC_MSG_RESULT([no])
+])
+])
+
+#
+# 2.6.38 export blkdev_get_by_dev
+#
+AC_DEFUN([LC_BLKDEV_GET_BY_DEV],
+[LB_CHECK_SYMBOL_EXPORT([blkdev_get_by_dev],
+[fs/block_dev.c],[
+AC_DEFINE(HAVE_BLKDEV_GET_BY_DEV, 1,
+ [blkdev_get_by_dev is exported by the kernel])
+],[
+])
+])
+
+#
+# 2.6.38 vfsmount.mnt_count doesn't use atomic_t
+#
+# 3.3 starts hiding vfsmount guts series (move from include/linux/mount.h to
+# fs/mount.h, see kernel commit 7d6fec45a5131918b51dcd76da52f2ec86a85be6)
+#
+AC_DEFUN([LC_ATOMIC_MNT_COUNT],
+[AC_MSG_CHECKING([if vfsmount guts is hidden, or vfsmount.mnt_count is atomic_t.])
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ #include <../fs/mount.h>
+],[
+ struct mount *mnt = real_mount((struct vfsmount *)0);
+],[
+ AC_DEFINE(HAVE_HIDE_VFSMOUNT_GUTS, 1,
+ [hide vfsmount guts in fs/mount.h])
+ AC_MSG_RESULT([yes, hide vfsmount guts in fs/mount.h])
+],[
+ LB_LINUX_TRY_COMPILE([
+ #include <asm/atomic.h>
+ #include <linux/fs.h>
+ #include <linux/mount.h>
+ ],[
+ ((struct vfsmount *)0)->mnt_count = ((atomic_t) { 0 });
+ ],[
+ AC_DEFINE(HAVE_ATOMIC_MNT_COUNT, 1,
+ [vfsmount.mnt_count is atomic_t])
+ AC_MSG_RESULT([yes, vfsmount.mnt_count is atomic_t])
+ ],[
+ AC_MSG_RESULT([no])
+ ])
+])
+])
+
+#
+# 2.6.38 use path as 4th parameter in quota_on.
+#
+AC_DEFUN([LC_QUOTA_ON_USE_PATH],
+[AC_MSG_CHECKING([quota_on use path as parameter])
+tmp_flags="$EXTRA_KCFLAGS"
+EXTRA_KCFLAGS="-Werror"
+LB_LINUX_TRY_COMPILE([
+ #include <linux/fs.h>
+ #include <linux/quota.h>
+],[
+ ((struct quotactl_ops *)0)->quota_on(NULL, 0, 0, ((struct path*)0));
+],[
+ AC_DEFINE(HAVE_QUOTA_ON_USE_PATH, 1,
+ [quota_on use path as 4th paramter])