From cf050db3e88bd68f17464afdc48805186eb300f4 Mon Sep 17 00:00:00 2001
From: "Dmitry V. Levin" <ldv@altlinux.org>
Date: Wed, 2 May 2012 10:21:49 +0000
Subject: Fix build with <linux/loop.h> from 2.6.18 kernel headers

* configure.ac: Check for LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN
declarations.
* loop.c (loop_flags_options): Use LO_FLAGS_AUTOCLEAR and
LO_FLAGS_PARTSCAN only when appropriate declarations are available.
(loop_ioctl): Use LOOP_SET_CAPACITY only when it is defined.
---
 configure.ac | 5 +++++
 loop.c       | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ec8db2d..82c8e87 100644
--- a/configure.ac
+++ b/configure.ac
@@ -254,6 +254,11 @@ AC_CHECK_DECLS(m4_normalize([
 	PTRACE_SETOPTIONS
 ]),,, [#include <sys/ptrace.h>])
 
+AC_CHECK_DECLS(m4_normalize([
+	LO_FLAGS_AUTOCLEAR,
+	LO_FLAGS_PARTSCAN
+]),,, [#include <linux/loop.h>])
+
 AC_CACHE_CHECK([for BLKGETSIZE64], [ac_cv_have_blkgetsize64],
 	[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
 #include <stdlib.h>
diff --git a/loop.c b/loop.c
index a350135..83d9152 100644
--- a/loop.c
+++ b/loop.c
@@ -33,8 +33,10 @@
 
 static const struct xlat loop_flags_options[] = {
 	{ LO_FLAGS_READ_ONLY,	"LO_FLAGS_READ_ONLY"	},
+#if HAVE_DECL_LO_FLAGS_AUTOCLEAR
 	{ LO_FLAGS_AUTOCLEAR,	"LO_FLAGS_AUTOCLEAR"	},
-#ifdef LO_FLAGS_PARTSCAN
+#endif
+#if HAVE_DECL_LO_FLAGS_PARTSCAN
 	{ LO_FLAGS_PARTSCAN,	"LO_FLAGS_PARTSCAN"	},
 #endif
 	{ 0,			NULL			},
@@ -164,7 +166,9 @@ int loop_ioctl(struct tcb *tcp, long code, long arg)
 		return 1;
 
 	case LOOP_CLR_FD:
+#ifdef LOOP_SET_CAPACITY
 	case LOOP_SET_CAPACITY:
+#endif
 #ifdef LOOP_CTL_GET_FREE
 	/* newer loop-control stuff */
 	case LOOP_CTL_GET_FREE:
-- 
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