ext3grep 版本：ext3grep-0.10.2.tar.gz
操作系统centos 7
产生原因：测试恢复被删除的文件
产生错误提示如下：
[root@localhost ext3grep-0.10.2]# make
make all-recursive
make[1]: 进入目录“/data/recovery/ext3grep-0.10.2”
Making all in src
make[2]: 进入目录“/data/recovery/ext3grep-0.10.2/src”
g++ -Iempty.pch.h -DHAVE_CONFIG_H -I. -I.. -g -O2 -DUSE_MMAP=1 -I/usr/include/ext2fs -I/usr/include/et -include pch.h -c -o pch.h.gch/6145d4709c827f9d2a94d7691c87ab4e ./pch-source.h
In file included from ./pch-source.h:43:0:
./ext3.h: 在成员函数‘__u32 Inode::reserved2() const’中:
./ext3.h:113:42: 错误：‘i_reserved2’在此作用域中尚未声明
__u32 reserved2(void) const { return i_reserved2; }
^
./ext3.h: 在成员函数‘void Inode::set_reserved2(__u32)’中:
./ext3.h:115:37: 错误：‘i_reserved2’在此作用域中尚未声明
void set_reserved2(__u32 val) { i_reserved2 = val; }
^
make[2]: *** [pch.h.gch/6145d4709c827f9d2a94d7691c87ab4e] 错误 1
make[2]: 离开目录“/data/recovery/ext3grep-0.10.2/src”
make[1]: *** [all-recursive] 错误 1
make[1]: 离开目录“/data/recovery/ext3grep-0.10.2”
make: *** [all] 错误 2
解决方法： （在对应的地方，将+后面的内容补充到ext3.h中
[root@localhost ext3grep-0.10.2]# vim src/ext3.h
可以参考@@后面的行号添加红色标出的内容差异（正式添加时去掉前边的加号）：
diff -ur ext3grep-0.10.1/src/ext3.h ext3grep-0.10.1.new/src/ext3.h
--- ext3grep-0.10.1/src/ext3.h2008-04-09 11:20:31.000000000 +0000
+++ ext3grep-0.10.1.new/src/ext3.h2011-12-10 07:00:50.000000000 +0000
@@ -24,6 +24,17 @@
#ifndef EXT3_H
#define EXT3_H
+// this trickery needs to happen before ext2_fs is included so
+// bail out if it has already been included by another path
+#ifdef _LINUX_EXT2_FS_H
+ #error please include this file before any other includes of ext2fs/ext2_fs.h
+#endif
+
+// some versions of the ext2 headers call this s_frags_per_group and some
+// call it s_clusters_per_group, define one to the other so our code works
+// with both
+#define s_clusters_per_group s_frags_per_group
+
// Use the header files from e2progs (http://e2fsprogs.sourceforge.net)
// We can use these headers and then everything named ext2 or ext3.
#include <ext2fs/ext2_fs.h>// Definitions of ext2, ext3 and ext4.
@@ -110,6 +121,12 @@
__u32 faddr(void) const { return i_faddr; }
__u16 uid_high(void) const { return i_uid_high; }
__u16 gid_high(void) const { return i_gid_high; }
+#ifndef i_reseved2
+ //i_reseved2 has been split into two fields in recent
+ //versions of the headers, luckilly we can still access
+ //it in one peice through the hurd side of the union
+ #define i_reserved2 osd2.hurd2.h_i_author
+#endif
__u32 reserved2(void) const { return i_reserved2; }
void set_reserved2(__u32 val) { i_reserved2 = val; }
保存退出继续安装，错误消失。