Linux 2.6.35 compat, fops->fsync()

The fsync() callback in the file_operations structure used to take
3 arguments.  The callback now only takes 2 arguments because the
dentry argument was determined to be unused by all consumers.  To
handle this a compatibility prototype was added to ensure the right
prototype is used.  Our implementation never used the dentry argument
either so it's just a matter of using the right prototype.

module/zfs/zpl_file.c

@@ -45,8 +45,7 @@ zpl_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	return (error);
 }
 
-static int
-zpl_fsync(struct file *filp, struct dentry *dentry, int datasync)
+ZPL_FSYNC_PROTO(zpl_fsync, filp, unused_dentry, datasync)
 {
 	cred_t *cr;
 	int error;