api: versioned symbols in libgfapi.so for compatibility

Use versioned symbols to keep libgfapi at libgfapi.so.0.0.0

Some nits uncovered:

+ there are a couple functions declared that do not have an
  associated definition, e.g. glfs_truncate(), glfs_caller_specific_init()

+ there are five private/internal functions used by heal/src/glfsheal
  and the gfapi master xlator (glfs-master.c): glfs_loc_touchup(),
  glfs_active_subvol(), and glfs_subvol_done(), glfs_init_done(),
  glfs_resolve_at(); which are not declared in glfs.h;

+ for this initial pass at versioned symbols, we use the earliest version
  of all public symbols, i.e. those for which there are declarations in
  glfs.h or glfs-handles.h.
  Further investigation as we do backports to 3.6, 3.4, and 3.4
  will be required to determine if older implementations need to
  be preserved (forward ported) and their associated alias(es) and
  symbol version(s) defined.

FWIW, we should consider linking all of our libraries with a map, it'll
result in a cleaner ABI. Perhaps something for an intern to do or a
Google Summer of Code project.

Change-Id: I64e6860d9ccfa22c40376eef2e1e6ebc0e36f051
BUG: 1160712
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/9058
Tested-by: Gluster Build System <jenkins@build.gluster.com>

1 files changed, 48 insertions, 15 deletions

diff --git a/api/src/glfs.c b/api/src/glfs.c
index e1f6bbcdab4..b5e03795290 100644
--- a/api/src/glfs.c
+++ b/api/src/glfs.c
@@ -278,8 +278,8 @@ out:
 
 
 int
-glfs_set_xlator_option (struct glfs *fs, const char *xlator, const char *key,
-			const char *value)
+pub_glfs_set_xlator_option (struct glfs *fs, const char *xlator,
+                            const char *key, const char *value)
 {
 	xlator_cmdline_option_t *option = NULL;
 
@@ -317,27 +317,44 @@ enomem:
 	return -1;
 }
 
-int glfs_setfsuid (uid_t fsuid)
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_set_xlator_option, 3.4.0);
+
+
+int
+pub_glfs_setfsuid (uid_t fsuid)
 {
 	return syncopctx_setfsuid (&fsuid);
 }
 
-int glfs_setfsgid (gid_t fsgid)
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_setfsuid, 3.4.2);
+
+
+int
+pub_glfs_setfsgid (gid_t fsgid)
 {
 	return syncopctx_setfsgid (&fsgid);
 }
 
-int glfs_setfsgroups (size_t size, const gid_t *list)
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_setfsgid, 3.4.2);
+
+
+int
+pub_glfs_setfsgroups (size_t size, const gid_t *list)
 {
 	return syncopctx_setfsgroups(size, list);
 }
 
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_setfsgroups, 3.4.2);
+
+
 struct glfs *
-glfs_from_glfd (struct glfs_fd *glfd)
+pub_glfs_from_glfd (struct glfs_fd *glfd)
 {
 	return glfd->fs;
 }
 
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_from_glfd, 3.4.0);
+
 
 struct glfs_fd *
 glfs_fd_new (struct glfs *fs)
@@ -402,7 +419,7 @@ glfs_poller (void *data)
 
 
 struct glfs *
-glfs_new (const char *volname)
+pub_glfs_new (const char *volname)
 {
 	struct glfs     *fs = NULL;
 	int              ret = -1;
@@ -448,9 +465,11 @@ glfs_new (const char *volname)
 	return fs;
 }
 
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_new, 3.4.0);
+
 
 int
-glfs_set_volfile (struct glfs *fs, const char *volfile)
+pub_glfs_set_volfile (struct glfs *fs, const char *volfile)
 {
 	cmd_args_t  *cmd_args = NULL;
 
@@ -484,9 +503,11 @@ glfs_set_volfile_server (struct glfs *fs, const char *transport,
 	return 0;
 }
 
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_set_volfile, 3.4.0);
+
 
 int
-glfs_set_logging (struct glfs *fs, const char *logfile, int loglevel)
+pub_glfs_set_logging (struct glfs *fs, const char *logfile, int loglevel)
 {
 	int  ret = 0;
 
@@ -502,6 +523,8 @@ glfs_set_logging (struct glfs *fs, const char *logfile, int loglevel)
 	return ret;
 }
 
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_set_logging, 3.4.0);
+
 
 int
 glfs_init_wait (struct glfs *fs)
@@ -524,7 +547,7 @@ glfs_init_wait (struct glfs *fs)
 
 
 void
-glfs_init_done (struct glfs *fs, int ret)
+priv_glfs_init_done (struct glfs *fs, int ret)
 {
 	glfs_init_cbk init_cbk;
 
@@ -554,6 +577,8 @@ out:
 	return;
 }
 
+GFAPI_SYMVER_PRIVATE_DEFAULT(glfs_init_done, 3.4.0);
+
 
 int
 glfs_init_common (struct glfs *fs)
@@ -591,7 +616,7 @@ glfs_init_async (struct glfs *fs, glfs_init_cbk cbk)
 
 
 int
-glfs_init (struct glfs *fs)
+pub_glfs_init (struct glfs *fs)
 {
 	int  ret = -1;
 
@@ -604,9 +629,14 @@ glfs_init (struct glfs *fs)
 	return ret;
 }
 
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_init, 3.4.0);
+
+
+extern xlator_t *
+priv_glfs_active_subvol (struct glfs *);
 
 int
-glfs_fini (struct glfs *fs)
+pub_glfs_fini (struct glfs *fs)
 {
         int             ret = -1;
         int             countdown = 100;
@@ -637,9 +667,9 @@ glfs_fini (struct glfs *fs)
          *pool*/
         ret = (call_pool->cnt == 0)? 0: -1;
 
-        subvol = glfs_active_subvol (fs);
+        subvol = priv_glfs_active_subvol (fs);
         if (subvol) {
-                /* PARENT_DOWN within glfs_subvol_done() is issued only
+                /* PARENT_DOWN within priv_glfs_subvol_done() is issued only
                    on graph switch (new graph should activiate and
                    decrement the extra @winds count taken in glfs_graph_setup()
 
@@ -652,7 +682,10 @@ glfs_fini (struct glfs *fs)
                 */
         }
 
-        glfs_subvol_done (fs, subvol);
+        priv_glfs_subvol_done (fs, subvol);
 
         return ret;
 }
+
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_fini, 3.4.0);
+