rpc: use export map to minimize exported symbols in libgf{rpc,xdr}.so

Without an export map (at link time) libgrpc and libgfxdr export over
150 and 450 symbols each, respectively. Many are not used by anything
else. (Unclear what the unused symbols are, some may be simple
sloppiness, e.g. not declaring functions static that should be. Others
may be intra-library calls that can't be static but aren't part of the
API, per se.)

By linking with an export map the number of exported symbols is
reduced to ~60 and ~250 respectively.

This parallels the similar change made to libglusterfs recently
and the older changes to the xlators to minimize the symbols that
are visible (exported) from the .so.

And I don't know, do we want to go all the way to symbol versions?
For these libs? And for libglusterfs?

fixes gluster/glusterfs#392

Change-Id: I9cdc3eee10e5f1408d7e7f2f29fad597c97e4003
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

2 files changed, 249 insertions, 2 deletions

diff --git a/rpc/xdr/src/Makefile.am b/rpc/xdr/src/Makefile.am
index abf8ada9777..45816b977d5 100644
--- a/rpc/xdr/src/Makefile.am
+++ b/rpc/xdr/src/Makefile.am
@@ -4,7 +4,7 @@ XDRGENFILES = glusterfs3-xdr.x glusterfs4-xdr.x cli1-xdr.x nlm4-xdr.x nsm-xdr.x
 XDRHEADERS = $(XDRGENFILES:.x=.h)
 XDRSOURCES = $(XDRGENFILES:.x=.c)
 
-EXTRA_DIST = $(XDRGENFILES)
+EXTRA_DIST = $(XDRGENFILES) libgfxdr.sym
 
 lib_LTLIBRARIES = libgfxdr.la
 
@@ -16,7 +16,8 @@ libgfxdr_la_CPPFLAGS = $(GF_CPPFLAGS) -D__USE_FILE_OFFSET64 \
 
 libgfxdr_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
 
-libgfxdr_la_LDFLAGS = -version-info $(LIBGFXDR_LT_VERSION)
+libgfxdr_la_LDFLAGS = -version-info $(LIBGFXDR_LT_VERSION) \
+		      -export-symbols $(top_srcdir)/rpc/xdr/src/libgfxdr.sym
 
 libgfxdr_la_SOURCES = xdr-generic.c xdr-nfs3.c msg-nfs3.c
 nodist_libgfxdr_la_SOURCES = $(XDRSOURCES)
diff --git a/rpc/xdr/src/libgfxdr.sym b/rpc/xdr/src/libgfxdr.sym
new file mode 100644
index 00000000000..8af956ef5a9
--- /dev/null
+++ b/rpc/xdr/src/libgfxdr.sym
@@ -0,0 +1,246 @@
+xdr_auth_glusterfs_parms
+xdr_auth_glusterfs_parms_v2
+xdr_changelog_event_req
+xdr_changelog_event_rsp
+xdr_changelog_probe_req
+xdr_changelog_probe_rsp
+xdr_dirpath
+xdr_free_exports_list
+xdr_free_mountlist
+xdr_gd1_mgmt_brick_op_req
+xdr_gd1_mgmt_brick_op_rsp
+xdr_gd1_mgmt_cluster_lock_req
+xdr_gd1_mgmt_cluster_lock_rsp
+xdr_gd1_mgmt_cluster_unlock_req
+xdr_gd1_mgmt_cluster_unlock_rsp
+xdr_gd1_mgmt_commit_op_req
+xdr_gd1_mgmt_commit_op_rsp
+xdr_gd1_mgmt_friend_req
+xdr_gd1_mgmt_friend_rsp
+xdr_gd1_mgmt_friend_update
+xdr_gd1_mgmt_friend_update_rsp
+xdr_gd1_mgmt_probe_req
+xdr_gd1_mgmt_probe_rsp
+xdr_gd1_mgmt_stage_op_req
+xdr_gd1_mgmt_stage_op_rsp
+xdr_gd1_mgmt_v3_brick_op_req
+xdr_gd1_mgmt_v3_brick_op_rsp
+xdr_gd1_mgmt_v3_commit_req
+xdr_gd1_mgmt_v3_commit_rsp
+xdr_gd1_mgmt_v3_lock_req
+xdr_gd1_mgmt_v3_lock_rsp
+xdr_gd1_mgmt_v3_post_val_req
+xdr_gd1_mgmt_v3_post_val_rsp
+xdr_gd1_mgmt_v3_pre_val_req
+xdr_gd1_mgmt_v3_pre_val_rsp
+xdr_gd1_mgmt_v3_unlock_req
+xdr_gd1_mgmt_v3_unlock_rsp
+xdr_gf1_cli_fsm_log_req
+xdr_gf1_cli_fsm_log_rsp
+xdr_gf1_cli_getwd_req
+xdr_gf1_cli_getwd_rsp
+xdr_gf1_cli_mount_req
+xdr_gf1_cli_mount_rsp
+xdr_gf1_cli_peer_list_req
+xdr_gf1_cli_peer_list_rsp
+xdr_gf1_cli_umount_req
+xdr_gf1_cli_umount_rsp
+xdr_gf_cli_req
+xdr_gf_cli_rsp
+xdr_gf_common_rsp
+xdr_gf_dump_req
+xdr_gf_dump_rsp
+xdr_gf_event_notify_req
+xdr_gf_event_notify_rsp
+xdr_gf_getsnap_name_uuid_req
+xdr_gf_getsnap_name_uuid_rsp
+xdr_gf_getspec_req
+xdr_gf_getspec_rsp
+xdr_gf_get_volume_info_req
+xdr_gf_get_volume_info_rsp
+xdr_gf_mgmt_hndsk_req
+xdr_gf_mgmt_hndsk_rsp
+xdr_gfs3_access_req
+xdr_gfs3_cbk_cache_invalidation_req
+xdr_gfs3_compound_req
+xdr_gfs3_compound_rsp
+xdr_gfs3_create_req
+xdr_gfs3_create_rsp
+xdr_gfs3_discard_req
+xdr_gfs3_discard_rsp
+xdr_gfs3_entrylk_req
+xdr_gfs3_fallocate_req
+xdr_gfs3_fallocate_rsp
+xdr_gfs3_fentrylk_req
+xdr_gfs3_fgetxattr_req
+xdr_gfs3_fgetxattr_rsp
+xdr_gfs3_finodelk_req
+xdr_gfs3_flush_req
+xdr_gfs3_fremovexattr_req
+xdr_gfs3_fsetattr_req
+xdr_gfs3_fsetattr_req_v2
+xdr_gfs3_fsetattr_rsp
+xdr_gfs3_fsetxattr_req
+xdr_gfs3_fstat_req
+xdr_gfs3_fstat_rsp
+xdr_gfs3_fsyncdir_req
+xdr_gfs3_fsync_req
+xdr_gfs3_fsync_rsp
+xdr_gfs3_ftruncate_req
+xdr_gfs3_ftruncate_rsp
+xdr_gfs3_fxattrop_req
+xdr_gfs3_fxattrop_rsp
+xdr_gfs3_getactivelk_req
+xdr_gfs3_getactivelk_rsp
+xdr_gfs3_getxattr_req
+xdr_gfs3_getxattr_rsp
+xdr_gfs3_inodelk_req
+xdr_gfs3_ipc_req
+xdr_gfs3_ipc_rsp
+xdr_gfs3_lease_req
+xdr_gfs3_lease_rsp
+xdr_gfs3_link_req
+xdr_gfs3_link_rsp
+xdr_gfs3_lk_req
+xdr_gfs3_lk_rsp
+xdr_gfs3_lookup_req
+xdr_gfs3_lookup_rsp
+xdr_gfs3_mkdir_req
+xdr_gfs3_mkdir_rsp
+xdr_gfs3_mknod_req
+xdr_gfs3_mknod_rsp
+xdr_gfs3_opendir_req
+xdr_gfs3_opendir_rsp
+xdr_gfs3_open_req
+xdr_gfs3_open_rsp
+xdr_gfs3_rchecksum_req
+xdr_gfs3_rchecksum_req_v2
+xdr_gfs3_rchecksum_rsp
+xdr_gfs3_readdirp_req
+xdr_gfs3_readdirp_rsp
+xdr_gfs3_readdir_req
+xdr_gfs3_readdir_rsp
+xdr_gfs3_readlink_req
+xdr_gfs3_readlink_rsp
+xdr_gfs3_read_req
+xdr_gfs3_read_rsp
+xdr_gfs3_recall_lease_req
+xdr_gfs3_releasedir_req
+xdr_gfs3_release_req
+xdr_gfs3_removexattr_req
+xdr_gfs3_rename_req
+xdr_gfs3_rename_rsp
+xdr_gfs3_rmdir_req
+xdr_gfs3_rmdir_rsp
+xdr_gfs3_seek_req
+xdr_gfs3_seek_rsp
+xdr_gfs3_setactivelk_req
+xdr_gfs3_setactivelk_rsp
+xdr_gfs3_setattr_req
+xdr_gfs3_setattr_rsp
+xdr_gfs3_setxattr_req
+xdr_gfs3_statfs_req
+xdr_gfs3_statfs_rsp
+xdr_gfs3_stat_req
+xdr_gfs3_stat_rsp
+xdr_gfs3_symlink_req
+xdr_gfs3_symlink_rsp
+xdr_gfs3_truncate_req
+xdr_gfs3_truncate_rsp
+xdr_gfs3_unlink_req
+xdr_gfs3_unlink_rsp
+xdr_gfs3_write_req
+xdr_gfs3_write_rsp
+xdr_gfs3_xattrop_req
+xdr_gfs3_xattrop_rsp
+xdr_gfs3_zerofill_req
+xdr_gfs3_zerofill_rsp
+xdr_gfs4_icreate_req
+xdr_gfs4_icreate_rsp
+xdr_gfs4_namelink_req
+xdr_gfs4_namelink_rsp
+xdr_gf_set_lk_ver_req
+xdr_gf_set_lk_ver_rsp
+xdr_gf_setvolume_req
+xdr_gf_setvolume_rsp
+xdr_gf_statedump
+xdr_length_round_up
+xdr_mon
+xdr_mountres3
+xdr_mountstat3
+xdr_nlm_sm_status
+xdr_pmap_brick_by_port_req
+xdr_pmap_brick_by_port_rsp
+xdr_pmap_port_by_brick_req
+xdr_pmap_port_by_brick_rsp
+xdr_pmap_signin_req
+xdr_pmap_signin_rsp
+xdr_pmap_signout_req
+xdr_pmap_signout_rsp
+xdr_serialize_access3res
+xdr_serialize_commit3res
+xdr_serialize_create3res
+xdr_serialize_exports
+xdr_serialize_fsinfo3res
+xdr_serialize_fsstat3res
+xdr_serialize_generic
+xdr_serialize_getaclreply
+xdr_serialize_getattr3res
+xdr_serialize_link3res
+xdr_serialize_lookup3res
+xdr_serialize_mkdir3res
+xdr_serialize_mknod3res
+xdr_serialize_mountlist
+xdr_serialize_mountres3
+xdr_serialize_mountstat3
+xdr_serialize_nlm4_res
+xdr_serialize_nlm4_shareres
+xdr_serialize_nlm4_testargs
+xdr_serialize_nlm4_testres
+xdr_serialize_pathconf3res
+xdr_serialize_read3res
+xdr_serialize_read3res_nocopy
+xdr_serialize_readdir3res
+xdr_serialize_readdirp3res
+xdr_serialize_readlink3res
+xdr_serialize_remove3res
+xdr_serialize_rename3res
+xdr_serialize_rmdir3res
+xdr_serialize_setaclreply
+xdr_serialize_setattr3res
+xdr_serialize_symlink3res
+xdr_serialize_write3res
+xdr_sm_stat
+xdr_sm_stat_res
+xdr_to_access3args
+xdr_to_commit3args
+xdr_to_create3args
+xdr_to_fsinfo3args
+xdr_to_fsstat3args
+xdr_to_generic
+xdr_to_getaclargs
+xdr_to_getattr3args
+xdr_to_link3args
+xdr_to_lookup3args
+xdr_to_mkdir3args
+xdr_to_mknod3args
+xdr_to_mountpath
+xdr_to_nlm4_cancelargs
+xdr_to_nlm4_freeallargs
+xdr_to_nlm4_lockargs
+xdr_to_nlm4_shareargs
+xdr_to_nlm4_testargs
+xdr_to_nlm4_unlockargs
+xdr_to_pathconf3args
+xdr_to_read3args
+xdr_to_readdir3args
+xdr_to_readdirp3args
+xdr_to_readlink3args
+xdr_to_remove3args
+xdr_to_rename3args
+xdr_to_rmdir3args
+xdr_to_setaclargs
+xdr_to_setattr3args
+xdr_to_symlink3args
+xdr_to_write3args
+xdr_vector_round_up