Update.

* sysdeps/unix/sysv/linux/internal_statvfs.c (__internal_statvfs):
	Avoid infinite loops in case the mounts file is hosed.
	* io/Makefile: Add rules to build and run tst-statvfs.
	* io/tst-statvfs.c: New file.

ChangeLog

@@ -1,5 +1,10 @@
 2003-10-26  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/unix/sysv/linux/internal_statvfs.c (__internal_statvfs):
+	Avoid infinite loops in case the mounts file is hosed.
+	* io/Makefile: Add rules to build and run tst-statvfs.
+	* io/tst-statvfs.c: New file.
+
 	* include/dlfcn.h (__RTLD_OPENEXEC): Define.
 	* elf/dl-load.c (_dl_map_object_from_fd): Don't allow loading
 	executables unless __RTLD_OPENEXEC flag is present.

io/Makefile

@@ -57,7 +57,7 @@ static-only-routines = stat fstat lstat mknod stat64 fstat64 lstat64
 others		:= pwd
 test-srcs	:= ftwtest
 tests		:= test-utime test-stat test-stat2 test-lfs tst-getcwd \
-		   tst-fcntl bug-ftw1 bug-ftw2 bug-ftw3
+		   tst-fcntl bug-ftw1 bug-ftw2 bug-ftw3 tst-statvfs
 
 distribute	:= ftwtest-sh
 
@@ -92,6 +92,8 @@ endif
 
 test-stat2-ARGS = Makefile . $(objpfx)test-stat2
 
+tst-statvfs-ARGS = $(objpfx)tst-statvfs tst-statvfs.c /tmp
+
 ifeq ($(cross-compiling),no)
 tests: $(objpfx)ftwtest.out
 

io/tst-statvfs.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <sys/statvfs.h>
+
+
+/* This test cannot detect many errors.  But it will fail if the
+   statvfs is completely hosed and it'll detect a missing export.  So
+   it is better than nothing.  */
+static int
+do_test (int argc, char *argv[])
+{
+  for (int i = 1; i < argc; ++i)
+    {
+      struct statvfs st;
+      if (statvfs (argv[i], &st) != 0)
+        printf ("%s: failed (%m)\n", argv[i]);
+      else
+        printf ("%s: free: %llu, mandatory: %s\n", argv[i],
+                (unsigned long long int) st.f_bfree,
+#ifdef ST_MANDLOCK
+                (st.f_flag & ST_MANDLOCK) ? "yes" : "no"
+#else
+                "no"
+#endif
+                );
+    }
+  return 0;
+}
+
+#define TEST_FUNCTION do_test (argc, argv)
+#include "../test-skeleton.c"

sysdeps/unix/sysv/linux/internal_statvfs.c

@@ -17,6 +17,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <assert.h>
 #include <errno.h>
 #include <mntent.h>
 #include <paths.h>
@@ -167,14 +168,17 @@ __internal_statvfs (const char *name, struct statvfs *buf,
 	     statvfs call got a name which was not the mount point.
 	     Check again, this time without checking for name matches
 	     first.  */
-	  if (! success)
+	  if (! success && (name != NULL || fsname != NULL))
 	    {
 	      if (name != NULL)
 		/* Try without a mount point name.  */
 		name = NULL;
-	      else if (fsname != NULL)
-		/* Try without a filesystem name.  */
-		fsname = fsname2 = NULL;
+	      else
+		{
+		  /* Try without a filesystem name.  */
+		  assert (fsname != NULL);
+		  fsname = fsname2 = NULL;
+		}
 
 	      /* It is not strictly allowed to use rewind here.  But
 		 this code is part of the implementation so it is