Add shared subtree support, suggested by Vladimir Dronnikov. Also break out a

few new (unfinished) config options, which I intend to make hidden (but
enabled) when CONFIG_NITPICK is disabled.  Getting the .config infrastructure
to do that is non-obvious, it seems...

2 files changed, 30 insertions, 1 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 745f8372b..963a0290c 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -407,7 +407,7 @@ extern const char * const bb_default_login_shell;
 #define DEFAULT_SHELL_SHORT_NAME     (bb_default_login_shell+6)
 
 
-extern const char bb_path_mtab_file[];
+extern char bb_path_mtab_file[];
 
 extern int bb_default_error_retval;
 
diff --git a/include/platform.h b/include/platform.h
index 8890d4ffd..ca6f3634f 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -228,6 +228,35 @@ typedef unsigned long long int  uintmax_t;
 
 #if defined(__linux__)
 #include <sys/mount.h>
+// Make sure we have all the new mount flags we actually try to use.
+#ifndef MS_BIND
+#define MS_BIND        (1<<12)
+#endif
+#ifndef MS_MOVE
+#define MS_MOVE        (1<<13)
+#endif
+#ifndef MS_RECURSIVE
+#define MS_RECURSIVE   (1<<14)
+#endif
+#ifndef MS_SILENT
+#define MS_SILENT      (1<<15)
+#endif
+
+// The shared subtree stuff, which went in around 2.6.15
+#ifndef MS_UNBINDABLE
+#define MS_UNBINDABLE  (1<<17)
+#endif
+#ifndef MS_PRIVATE
+#define MS_PRIVATE     (1<<18)
+#endif
+#ifndef MS_SLAVE
+#define MS_SLAVE       (1<<19)
+#endif
+#ifndef MS_SHARED
+#define MS_SHARED      (1<<20)
+#endif
+
+ 
 #if !defined(BLKSSZGET)
 #define BLKSSZGET _IO(0x12, 104)
 #endif