posix: accept inode 0 is a valid inode number (BZ #19971)

According to this kernel commit 2adc376c55194, d_ino 0 is a regular inode
number on Linux (which also matches POSIX, as it does not treat the value
as special).  This patch makes glob accept is a valid inode number.

This is also a sync with gnulib commit c8e57c1.

Checked on x86_64-linux-gnu and on a build using build-many-glibcs.py
for all major architectures.

	[BZ #1062]
	[BZ #19971]
	* posix/glob.c (struct readdir_result): Remove skip_entry member.
	(readdir_result_skip_entry, D_INO_TO_RESULT): Remove.
	All uses removed.

2 files changed, 6 insertions, 21 deletions

diff --git a/ChangeLog b/ChangeLog
index 4fdc0bc..d48cca3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,12 @@
 2017-09-08  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
 	[BZ #1062]
+	[BZ #19971]
+	* posix/glob.c (struct readdir_result): Remove skip_entry member.
+	(readdir_result_skip_entry, D_INO_TO_RESULT): Remove.
+	All uses removed.
+
+	[BZ #1062]
 	* posix/Makefile (routines): Add globfree, globfree64, and
 	glob_pattern_p.
 	* posix/flexmember.h: New file.
diff --git a/posix/glob.c b/posix/glob.c
index a7eccf9..dbf88ff 100644
--- a/posix/glob.c
+++ b/posix/glob.c
@@ -113,9 +113,6 @@ struct readdir_result
 #if defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE
   dirent_type type;
 #endif
-#if defined _LIBC || defined D_INO_IN_DIRENT
-  bool skip_entry;
-#endif
 };
 
 /* Initialize and return type member of struct readdir_result.  */
@@ -131,28 +128,12 @@ readdir_result_type (struct readdir_result d)
 #endif
 }
 
-/* Initialize and return skip_entry member of struct readdir_result.  */
-static bool
-readdir_result_skip_entry (struct readdir_result d)
-{
-/* Initializer for skip_entry.  POSIX does not require that the d_ino
-   field be present, and some systems do not provide it. */
-#if defined _LIBC || defined D_INO_IN_DIRENT
-# define D_INO_TO_RESULT(source) (source)->d_ino == 0,
-  return d.skip_entry;
-#else
-# define D_INO_TO_RESULT(source)
-  return false;
-#endif
-}
-
 /* Construct an initializer for a struct readdir_result object from a
    struct dirent *.  No copy of the name is made.  */
 #define READDIR_RESULT_INITIALIZER(source) \
   {					   \
     source->d_name,			   \
     D_TYPE_TO_RESULT (source)		   \
-    D_INO_TO_RESULT (source)		   \
   }
 
 /* Call gl_readdir on STREAM.  This macro can be overridden to reduce
@@ -1542,8 +1523,6 @@ glob_in_dir (const char *pattern, const char *directory, int flags,
 	      }
 	      if (d.name == NULL)
 		break;
-	      if (readdir_result_skip_entry (d))
-		continue;
 
 	      /* If we shall match only directories use the information
 		 provided by the dirent call if possible.  */