Linux: Rework statfs super block operations configure test

The configure test to detect if the statfs super block operation
needs a dentry argument is based on vfs_statfs, and assumes that
its signature matches the one of the operation.  In 2.6.36 this is
no longer true and the test fails.

Rework the test to actually test the operation we're interested in.

This change is required for 2.6.36.

Change-Id: I5a712fb47e48c1bcc7ea2cfbf6c53c2b27627723
Reviewed-on: http://gerrit.openafs.org/2545
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>

diff --git a/src/cf/linux-test4.m4 b/src/cf/linux-test4.m4
index 16ea872c0572bb11e31b4fd23fc5df7776109ac2..2a198aa514ce14a1efa246520fea253b6d5606a2 100644 (file)
--- a/src/cf/linux-test4.m4
+++ b/src/cf/linux-test4.m4
@@ -269,7 +269,10 @@ AC_DEFUN([LINUX_STATFS_TAKES_DENTRY], [
                       [ac_cv_linux_statfs_takes_dentry],
 [#include <linux/fs.h>
 #include <linux/statfs.h>],
-                      [extern int vfs_statfs(struct dentry *, struct kstatfs *);],
+[struct super_block _sb;
+struct dentry _dentry;
+struct kstatfs _kstatfs;
+(void)_sb.s_op->statfs(&_dentry, &_kstatfs);],
                       [STATFS_TAKES_DENTRY],
                       [define if your statfs takes a dentry argument])
 ])