locks: added inodelk/entrylk contention upcall notifications

The locks xlator now is able to send a contention notification to
the current owner of the lock.

This is only a notification that can be used to improve performance
of some client side operations that might benefit from extended
duration of lock ownership. Nothing is done if the lock owner decides
to ignore the message and to not release the lock. For forced
release of acquired resources, leases must be used.

Change-Id: I7f1ad32a0b4b445505b09908a050080ad848f8e0
Signed-off-by: Xavier Hernandez <xhernandez@datalab.es>

1 files changed, 156 insertions, 0 deletions

diff --git a/rpc/xdr/src/glusterfs3.h b/rpc/xdr/src/glusterfs3.h
index 2da5594a347..eef39416b5c 100644
--- a/rpc/xdr/src/glusterfs3.h
+++ b/rpc/xdr/src/glusterfs3.h
@@ -419,6 +419,162 @@ gf_proto_cache_invalidation_to_upcall (xlator_t *this,
         return ret;
 }
 
+static inline int
+gf_proto_inodelk_contention_to_upcall (struct gfs4_inodelk_contention_req *lc,
+                                       struct gf_upcall *gf_up_data)
+{
+        struct gf_upcall_inodelk_contention *tmp = NULL;
+        xlator_t *this                           = NULL;
+        int    ret                               = -1;
+        int    op_errno                          = EINVAL;
+
+        this = THIS;
+
+        GF_VALIDATE_OR_GOTO(this->name, lc, out);
+        GF_VALIDATE_OR_GOTO(this->name, gf_up_data, out);
+
+        tmp = (struct gf_upcall_inodelk_contention *)gf_up_data->data;
+
+        gf_uuid_copy(gf_up_data->gfid, (unsigned char *)lc->gfid);
+
+        gf_proto_flock_to_flock(&lc->flock, &tmp->flock);
+        tmp->pid = lc->pid;
+        tmp->domain = lc->domain;
+        if ((tmp->domain != NULL) && (*tmp->domain == 0)) {
+                tmp->domain = NULL;
+        }
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (this, tmp->xdata, lc->xdata.xdata_val,
+                                      lc->xdata.xdata_len, ret, op_errno, out);
+
+        ret = 0;
+
+out:
+        if (ret < 0) {
+                ret = -op_errno;
+        }
+
+        return ret;
+}
+
+static inline int
+gf_proto_inodelk_contention_from_upcall (xlator_t *this,
+                                         struct gfs4_inodelk_contention_req *lc,
+                                         struct gf_upcall *gf_up_data)
+{
+        struct gf_upcall_inodelk_contention *tmp = NULL;
+        int    ret                               = -1;
+        int    op_errno                          = EINVAL;
+
+        GF_VALIDATE_OR_GOTO(this->name, lc, out);
+        GF_VALIDATE_OR_GOTO(this->name, gf_up_data, out);
+
+        tmp = (struct gf_upcall_inodelk_contention *)gf_up_data->data;
+
+        gf_uuid_copy((unsigned char *)lc->gfid, gf_up_data->gfid);
+
+        gf_proto_flock_from_flock(&lc->flock, &tmp->flock);
+        lc->pid = tmp->pid;
+        lc->domain = (char *)tmp->domain;
+        if (lc->domain == NULL) {
+                lc->domain = "";
+        }
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, tmp->xdata, &lc->xdata.xdata_val,
+                                    lc->xdata.xdata_len, op_errno, out);
+
+        ret = 0;
+
+out:
+        if (ret < 0) {
+                ret = -op_errno;
+        }
+
+        return ret;
+}
+
+static inline int
+gf_proto_entrylk_contention_to_upcall (struct gfs4_entrylk_contention_req *lc,
+                                       struct gf_upcall *gf_up_data)
+{
+        struct gf_upcall_entrylk_contention *tmp = NULL;
+        xlator_t *this                           = NULL;
+        int    ret                               = -1;
+        int    op_errno                          = EINVAL;
+
+        this = THIS;
+
+        GF_VALIDATE_OR_GOTO(this->name, lc, out);
+        GF_VALIDATE_OR_GOTO(this->name, gf_up_data, out);
+
+        tmp = (struct gf_upcall_entrylk_contention *)gf_up_data->data;
+
+        gf_uuid_copy(gf_up_data->gfid, (unsigned char *)lc->gfid);
+
+        tmp->type = lc->type;
+        tmp->name = lc->name;
+        if ((tmp->name != NULL) && (*tmp->name == 0)) {
+                tmp->name = NULL;
+        }
+        tmp->pid = lc->pid;
+        tmp->domain = lc->domain;
+        if ((tmp->domain != NULL) && (*tmp->domain == 0)) {
+                tmp->domain = NULL;
+        }
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (this, tmp->xdata, lc->xdata.xdata_val,
+                                      lc->xdata.xdata_len, ret, op_errno, out);
+
+        ret = 0;
+
+out:
+        if (ret < 0) {
+                ret = -op_errno;
+        }
+
+        return ret;
+}
+
+static inline int
+gf_proto_entrylk_contention_from_upcall (xlator_t *this,
+                                         struct gfs4_entrylk_contention_req *lc,
+                                         struct gf_upcall *gf_up_data)
+{
+        struct gf_upcall_entrylk_contention *tmp = NULL;
+        int    ret                               = -1;
+        int    op_errno                          = EINVAL;
+
+        GF_VALIDATE_OR_GOTO(this->name, lc, out);
+        GF_VALIDATE_OR_GOTO(this->name, gf_up_data, out);
+
+        tmp = (struct gf_upcall_entrylk_contention *)gf_up_data->data;
+
+        gf_uuid_copy((unsigned char *)lc->gfid, gf_up_data->gfid);
+
+        lc->type = tmp->type;
+        lc->name = (char *)tmp->name;
+        if (lc->name == NULL) {
+                lc->name = "";
+        }
+        lc->pid = tmp->pid;
+        lc->domain = (char *)tmp->domain;
+        if (lc->domain == NULL) {
+                lc->domain = "";
+        }
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, tmp->xdata, &lc->xdata.xdata_val,
+                                    lc->xdata.xdata_len, op_errno, out);
+
+        ret = 0;
+
+out:
+        if (ret < 0) {
+                ret = -op_errno;
+        }
+
+        return ret;
+}
+
 extern int dict_to_xdr (dict_t *this, gfx_dict *xdict);
 extern int xdr_to_dict (gfx_dict *xdict, dict_t **to);