core, client, server: Support auxiliary group ids

Support for auxiliary group ids is needed for transmission
of more than one group id right through the xlator tree
so that posix can use these group ids to perform
in-house permission tests. The in-house permission checks are
needed so that we do not have to depend on non-POSIX calls
like setfs[ug]id for changing the user for each fop.

The setfs[ug]id  are also limited since they do not allow setting
multiple group id as required for operation with NFS, which sends
us all the group ids for a process issuing file system requests.

Signed-off-by: Shehjar Tikoo <shehjart@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 400 (Support auxiliary gids in GlusterFS)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=400

2 files changed, 40 insertions, 0 deletions

diff --git a/xlators/protocol/client/src/client-protocol.c b/xlators/protocol/client/src/client-protocol.c
index d0f33e730..3ad41009c 100644
--- a/xlators/protocol/client/src/client-protocol.c
+++ b/xlators/protocol/client/src/client-protocol.c
@@ -539,6 +539,24 @@ out:
 }
 
 int
+client_encode_groups (call_frame_t *frame, gf_hdr_common_t *hdr)
+{
+        int     i = 0;
+        if ((!frame) || (!hdr))
+                return -1;
+
+        hdr->req.ngrps = hton32 (frame->root->ngrps);
+        if (frame->root->ngrps == 0)
+                return 0;
+
+        for (; i < frame->root->ngrps; ++i)
+                hdr->req.groups[i] = hton32 (frame->root->groups[i]);
+
+        return 0;
+}
+
+
+int
 protocol_client_xfer (call_frame_t *frame, xlator_t *this, transport_t *trans,
                       int type, int op,
                       gf_hdr_common_t *hdr, size_t hdrlen,
@@ -572,6 +590,7 @@ protocol_client_xfer (call_frame_t *frame, xlator_t *this, transport_t *trans,
                         hdr->req.uid = hton32 (frame->root->uid);
                         hdr->req.gid = hton32 (frame->root->gid);
                         hdr->req.pid = hton32 (frame->root->pid);
+                        client_encode_groups (frame, hdr);
                 }
 
                 if (conn->connected == 0)
diff --git a/xlators/protocol/server/src/server-protocol.c b/xlators/protocol/server/src/server-protocol.c
index b7b644765..94a1ded32 100644
--- a/xlators/protocol/server/src/server-protocol.c
+++ b/xlators/protocol/server/src/server-protocol.c
@@ -6108,6 +6108,26 @@ out:
         return frame;
 }
 
+
+int
+server_decode_groups (call_frame_t *frame, gf_hdr_common_t *hdr)
+{
+        int     i = 0;
+
+        if ((!frame) || (!hdr))
+                return 0;
+
+        frame->root->ngrps = ntoh32 (hdr->req.ngrps);
+        if (frame->root->ngrps == 0)
+                return 0;
+
+        for (; i < frame->root->ngrps; ++i)
+                frame->root->groups[i] = ntoh32 (hdr->req.groups[i]);
+
+        return 0;
+}
+
+
 /*
  * get_frame_for_call - create a frame into the capable of
  *                      generating and replying the reply packet by itself.
@@ -6134,6 +6154,7 @@ get_frame_for_call (transport_t *trans, gf_hdr_common_t *hdr)
         frame->root->unique      = ntoh64 (hdr->callid);      /* which call */
         frame->root->gid         = ntoh32 (hdr->req.gid);
         frame->root->pid         = ntoh32 (hdr->req.pid);
+        server_decode_groups (frame, hdr);
 
         return frame;
 }