core: use readdir(3) with glibc, and associated cleanup

Starting with glibc-2.23 (i.e. what's in Fedora 25), readdir_r(3)
is marked as deprecated. Specifically the function decl in <dirent.h>
has the deprecated attribute, and now warnings are thrown during the
compile on Fedora 25 builds.

The readdir(_r)(3) man page (on Fedora 25 at least) and World+Dog say
that glibc's readdir(3) is, and always has been, MT-SAFE as long as
only one thread is accessing the directory object returned by opendir().
World+Dog also says there is a potential buffer overflow in readdir_r().
World+Dog suggests that it is preferable to simply use readdir(). There's
an implication that eventually readdir_r(3) will be removed from glibc.
POSIX has, apparently deprecated it in the standard, or even removed it
entirely.

Over and above that, our source near the various uses of readdir(_r)(3)
has a few unsafe uses of strcpy()+strcat().

(AFAIK nobody has looked at the readdir(3) implemenation in *BSD to see
if the same is true on those platforms, and we can't be sure of MacOS
even though we know it's based on *BSD.)

Change-Id: I5481f18ba1eebe7ee177895eecc9a80a71b60568
BUG: 1356998
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/14838
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/xlators/features/changelog/src/changelog-mem-types.h b/xlators/features/changelog/src/changelog-mem-types.h
index 1618f722f6c..33fea31b979 100644
--- a/xlators/features/changelog/src/changelog-mem-types.h
+++ b/xlators/features/changelog/src/changelog-mem-types.h
@@ -23,12 +23,11 @@ enum gf_changelog_mem_types {
         gf_changelog_mt_libgfchangelog_t           = gf_common_mt_end + 7,
         gf_changelog_mt_libgfchangelog_entry_t     = gf_common_mt_end + 8,
         gf_changelog_mt_libgfchangelog_rl_t        = gf_common_mt_end + 9,
-        gf_changelog_mt_libgfchangelog_dirent_t    = gf_common_mt_end + 10,
-        gf_changelog_mt_changelog_buffer_t         = gf_common_mt_end + 11,
-        gf_changelog_mt_history_data_t             = gf_common_mt_end + 12,
-        gf_changelog_mt_libgfchangelog_call_pool_t = gf_common_mt_end + 13,
-        gf_changelog_mt_libgfchangelog_event_t     = gf_common_mt_end + 14,
-        gf_changelog_mt_ev_dispatcher_t            = gf_common_mt_end + 15,
+        gf_changelog_mt_changelog_buffer_t         = gf_common_mt_end + 10,
+        gf_changelog_mt_history_data_t             = gf_common_mt_end + 11,
+        gf_changelog_mt_libgfchangelog_call_pool_t = gf_common_mt_end + 12,
+        gf_changelog_mt_libgfchangelog_event_t     = gf_common_mt_end + 13,
+        gf_changelog_mt_ev_dispatcher_t            = gf_common_mt_end + 14,
         gf_changelog_mt_end
 };