libglusterfs: Added support to set 'frame->root->lkowner'

This support can be used by the clients using SYNCOP framework,
to pass unique owners for various locks taken on a file, so that
the glusterfs-server can treat them as being locks from different owners.

Change-Id: Ie88014053af40fc7913ad6c1f7730d54cc44ddab
BUG: 1186713
Signed-off-by: Soumya Koduri <skoduri@redhat.com>
Reviewed-on: http://review.gluster.org/9482
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

2 files changed, 46 insertions, 0 deletions

diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index 56042d6897e..f571a2ae8bd 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -209,6 +209,46 @@ out:
 	return ret;
 }
 
+int
+syncopctx_setfslkowner (gf_lkowner_t *lk_owner)
+{
+        struct syncopctx *opctx = NULL;
+        int               ret = 0;
+
+        /* In args check */
+        if (!lk_owner) {
+                ret = -1;
+                errno = EINVAL;
+                goto out;
+        }
+
+        opctx = syncopctx_getctx ();
+
+        /* alloc for this thread the first time */
+        if (!opctx) {
+                opctx = GF_CALLOC (1, sizeof (*opctx), gf_common_mt_syncopctx);
+                if (!opctx) {
+                        ret = -1;
+                        goto out;
+                }
+
+                ret = syncopctx_setctx (opctx);
+                if (ret != 0) {
+                        GF_FREE (opctx);
+                        opctx = NULL;
+                        goto out;
+                }
+        }
+
+out:
+        if (opctx && lk_owner) {
+                opctx->lk_owner = *lk_owner;
+                opctx->valid |= SYNCOPCTX_LKOWNER;
+        }
+
+        return ret;
+}
+
 static void
 __run (struct synctask *task)
 {
diff --git a/libglusterfs/src/syncop.h b/libglusterfs/src/syncop.h
index 40ed0e865e3..3f751de6da5 100644
--- a/libglusterfs/src/syncop.h
+++ b/libglusterfs/src/syncop.h
@@ -32,6 +32,7 @@
 #define SYNCOPCTX_GID    0x00000002
 #define SYNCOPCTX_GROUPS 0x00000004
 #define SYNCOPCTX_PID    0x00000008
+#define SYNCOPCTX_LKOWNER 0x00000010
 
 struct synctask;
 struct syncproc;
@@ -167,6 +168,7 @@ struct syncopctx {
         int          ngrps;
         gid_t       *groups;
 	pid_t        pid;
+        gf_lkowner_t lk_owner;
 };
 
 #define __yawn(args) do {                                       \
@@ -264,6 +266,7 @@ int syncopctx_setfsuid (void *uid);
 int syncopctx_setfsgid (void *gid);
 int syncopctx_setfsgroups (int count, const void *groups);
 int syncopctx_setfspid (void *pid);
+int syncopctx_setfslkowner (gf_lkowner_t *lk_owner);
 
 static inline call_frame_t *
 syncop_create_frame (xlator_t *this)
@@ -324,6 +327,9 @@ syncop_create_frame (xlator_t *this)
 		}
 	}
 
+        if (opctx && (opctx->valid & SYNCOPCTX_LKOWNER))
+                frame->root->lk_owner = opctx->lk_owner;
+
 	return frame;
 }