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 seven 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(), glfs_free_from_ctx(), and glfs_new_from_ctx();
  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: I499456807a5cd26acb39843216ece4276f8e9b84
BUG: 1160709
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/9036
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Niels de Vos <ndevos@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 17 insertions, 12 deletions

diff --git a/api/src/glfs-resolve.c b/api/src/glfs-resolve.c
index 7ed45169a25..7a3a0bc13c7 100644
--- a/api/src/glfs-resolve.c
+++ b/api/src/glfs-resolve.c
@@ -137,7 +137,7 @@ __glfs_refresh_inode (struct glfs *fs, xlator_t *subvol, inode_t *inode)
 }
 
 int
-glfs_loc_touchup (loc_t *loc)
+priv_glfs_loc_touchup (loc_t *loc)
 {
 	char *path = NULL;
 	int   ret = -1;
@@ -165,6 +165,7 @@ out:
 	return ret;
 }
 
+GFAPI_SYMVER_PRIVATE_DEFAULT(glfs_loc_touchup, 3.4.0);
 
 int
 glfs_resolve_symlink (struct glfs *fs, xlator_t *subvol, inode_t *inode,
@@ -283,7 +284,7 @@ glfs_resolve_component (struct glfs *fs, xlator_t *subvol, inode_t *parent,
 
 	}
 
-	glret = glfs_loc_touchup (&loc);
+	glret = priv_glfs_loc_touchup (&loc);
 	if (glret < 0) {
 		ret = -1;
 		goto out;
@@ -343,7 +344,7 @@ out:
 
 
 int
-glfs_resolve_at (struct glfs *fs, xlator_t *subvol, inode_t *at,
+priv_glfs_resolve_at (struct glfs *fs, xlator_t *subvol, inode_t *at,
 		 const char *origpath, loc_t *loc, struct iatt *iatt,
 		 int follow, int reval)
 {
@@ -420,7 +421,7 @@ glfs_resolve_at (struct glfs *fs, xlator_t *subvol, inode_t *at,
 			if (ret < 0)
 				break;
 
-			ret = glfs_resolve_at (fs, subvol, parent, lpath,
+			ret = priv_glfs_resolve_at (fs, subvol, parent, lpath,
 					       &sym_loc,
 					       /* followed iatt becomes the
 						  component iatt
@@ -474,7 +475,7 @@ glfs_resolve_at (struct glfs *fs, xlator_t *subvol, inode_t *at,
 		ret = 0;
 	}
 
-        if (glfs_loc_touchup (loc) < 0) {
+        if (priv_glfs_loc_touchup (loc) < 0) {
                 ret = -1;
         }
 out:
@@ -485,6 +486,8 @@ out:
 	return ret;
 }
 
+GFAPI_SYMVER_PRIVATE_DEFAULT(glfs_resolve_at, 3.4.0);
+
 
 int
 glfs_resolve_path (struct glfs *fs, xlator_t *subvol, const char *origpath,
@@ -494,13 +497,13 @@ glfs_resolve_path (struct glfs *fs, xlator_t *subvol, const char *origpath,
 	inode_t *cwd = NULL;
 
 	if (origpath[0] == '/')
-		return glfs_resolve_at (fs, subvol, NULL, origpath, loc, iatt,
-					follow, reval);
+		return priv_glfs_resolve_at (fs, subvol, NULL, origpath, loc,
+                                             iatt, follow, reval);
 
 	cwd = glfs_cwd_get (fs);
 
-	ret = glfs_resolve_at (fs, subvol, cwd, origpath, loc, iatt,
-			       follow, reval);
+	ret = priv_glfs_resolve_at (fs, subvol, cwd, origpath, loc, iatt,
+                                    follow, reval);
 	if (cwd)
 		inode_unref (cwd);
 
@@ -827,7 +830,7 @@ __glfs_active_subvol (struct glfs *fs)
 }
 
 xlator_t *
-glfs_active_subvol (struct glfs *fs)
+priv_glfs_active_subvol (struct glfs *fs)
 {
 	xlator_t      *subvol = NULL;
 	xlator_t      *old_subvol = NULL;
@@ -848,14 +851,15 @@ glfs_active_subvol (struct glfs *fs)
 	glfs_unlock (fs);
 
 	if (old_subvol)
-		glfs_subvol_done (fs, old_subvol);
+		priv_glfs_subvol_done (fs, old_subvol);
 
 	return subvol;
 }
 
+GFAPI_SYMVER_PRIVATE_DEFAULT(glfs_active_subvol, 3.4.0);
 
 void
-glfs_subvol_done (struct glfs *fs, xlator_t *subvol)
+priv_glfs_subvol_done (struct glfs *fs, xlator_t *subvol)
 {
 	int ref = 0;
 	xlator_t *active_subvol = NULL;
@@ -876,6 +880,7 @@ glfs_subvol_done (struct glfs *fs, xlator_t *subvol)
 	}
 }
 
+GFAPI_SYMVER_PRIVATE_DEFAULT(glfs_subvol_done, 3.4.0);
 
 int
 __glfs_cwd_set (struct glfs *fs, inode_t *inode)