glusterd: bring in feature to use syncop for mgmt ops

* new sycnop routines added to mgmt program
* one should not use 'glusterd_op_begin()', instead can use the
  synctask framework, 'glusterd_op_begin_synctask()'
* currently using for below operations:
  'volume start', 'volume rebalance', 'volume quota',
  'volume replace-brick' and 'volume add-brick'

Change-Id: I0bee76d06790d5c5bb5db15d443b44af0e21f1c0
BUG: 762935
Signed-off-by: Amar Tumballi <amar@gluster.com>
Reviewed-on: http://review.gluster.com/479
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

1 files changed, 392 insertions, 0 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd-syncop.c b/xlators/mgmt/glusterd/src/glusterd-syncop.c
new file mode 100644
index 000000000..c1fdde19a
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-syncop.c
@@ -0,0 +1,392 @@
+/*
+  Copyright (c) 2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+/* rpc related syncops */
+#include "syncop.h"
+#include "rpc-clnt.h"
+#include "protocol-common.h"
+#include "xdr-generic.h"
+#include "glusterd1-xdr.h"
+#include "glusterd-syncop.h"
+
+int
+gd_syncop_submit_request (struct rpc_clnt *rpc, void *req,
+                          void *cookie, rpc_clnt_prog_t *prog,
+                          int procnum, fop_cbk_fn_t cbkfn, xdrproc_t xdrproc)
+{
+        int            ret      = -1;
+        struct iobuf  *iobuf    = NULL;
+        struct iobref *iobref   = NULL;
+        int            count    = 0;
+        struct iovec   iov      = {0, };
+        ssize_t        req_size = 0;
+
+        GF_ASSERT (rpc);
+        if (!req)
+                goto out;
+
+        req_size = xdr_sizeof (xdrproc, req);
+        iobuf = iobuf_get2 (rpc->ctx->iobuf_pool, req_size);
+        if (!iobuf)
+                goto out;
+
+        iobref = iobref_new ();
+        if (!iobref)
+                goto out;
+
+        iobref_add (iobref, iobuf);
+
+        iov.iov_base = iobuf->ptr;
+        iov.iov_len  = iobuf_pagesize (iobuf);
+
+        /* Create the xdr payload */
+        ret = xdr_serialize_generic (iov, req, xdrproc);
+        if (ret == -1)
+                goto out;
+
+        iov.iov_len = ret;
+        count = 1;
+
+        /* Send the msg */
+        ret = rpc_clnt_submit (rpc, prog, procnum, cbkfn,
+                               &iov, count, NULL, 0, iobref,
+                               (call_frame_t *)cookie, NULL, 0, NULL, 0, NULL);
+
+        /* TODO: do we need to start ping also? */
+
+out:
+        iobref_unref (iobref);
+        iobuf_unref (iobuf);
+
+        return ret;
+}
+
+/* Defined in glusterd-rpc-ops.c */
+extern struct rpc_clnt_program gd_mgmt_prog;
+
+int32_t
+gd_syncop_mgmt_lock_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *cookie)
+{
+        struct syncargs           *args  = NULL;
+        gd1_mgmt_cluster_lock_rsp  rsp   = {{0},};
+        int                        ret   = -1;
+
+        args = cookie;
+
+        /* initialize */
+        args->op_ret   = -1;
+        args->op_errno = EINVAL;
+
+        if (-1 == req->rpc_status) {
+                args->op_errno = ENOTCONN;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_cluster_lock_rsp);
+        if (ret < 0) {
+                goto out;
+        }
+
+        args->op_ret = rsp.op_ret;
+        args->op_errno = rsp.op_errno;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+out:
+        __wake (args);
+
+        return 0;
+}
+
+
+int
+gd_syncop_mgmt_lock (struct rpc_clnt *rpc, uuid_t my_uuid, uuid_t recv_uuid)
+{
+        struct syncargs           args = {0, };
+        gd1_mgmt_cluster_lock_req req  = {{0},};
+
+        uuid_copy (req.uuid, my_uuid);
+
+        args.op_ret = -1;
+        args.op_errno = ENOTCONN;
+
+        GD_SYNCOP (rpc, (&args), gd_syncop_mgmt_lock_cbk,
+                   &req, &gd_mgmt_prog, GLUSTERD_MGMT_CLUSTER_LOCK,
+                   xdr_gd1_mgmt_cluster_lock_req);
+
+        if (!args.op_ret)
+                uuid_copy (recv_uuid, args.uuid);
+
+        errno = args.op_errno;
+        return args.op_ret;
+
+}
+
+int32_t
+gd_syncop_mgmt_unlock_cbk (struct rpc_req *req, struct iovec *iov,
+                           int count, void *cookie)
+{
+        struct syncargs             *args  = NULL;
+        gd1_mgmt_cluster_unlock_rsp  rsp   = {{0},};
+        int                          ret   = -1;
+
+        args = cookie;
+
+        /* initialize */
+        args->op_ret   = -1;
+        args->op_errno = EINVAL;
+
+        if (-1 == req->rpc_status) {
+                args->op_errno = ENOTCONN;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_cluster_unlock_rsp);
+        if (ret < 0) {
+                goto out;
+        }
+
+        args->op_ret = rsp.op_ret;
+        args->op_errno = rsp.op_errno;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+out:
+        __wake (args);
+
+        return 0;
+}
+
+
+int
+gd_syncop_mgmt_unlock (struct rpc_clnt *rpc, uuid_t my_uuid, uuid_t recv_uuid)
+{
+        struct syncargs             args = {0, };
+        gd1_mgmt_cluster_unlock_req req  = {{0},};
+
+        uuid_copy (req.uuid, my_uuid);
+
+        args.op_ret = -1;
+        args.op_errno = ENOTCONN;
+
+        GD_SYNCOP (rpc, (&args), gd_syncop_mgmt_unlock_cbk,
+                   &req, &gd_mgmt_prog, GLUSTERD_MGMT_CLUSTER_UNLOCK,
+                   xdr_gd1_mgmt_cluster_unlock_req);
+
+        if (!args.op_ret)
+                uuid_copy (recv_uuid, args.uuid);
+
+        errno = args.op_errno;
+        return args.op_ret;
+
+}
+
+int32_t
+gd_syncop_stage_op_cbk (struct rpc_req *req, struct iovec *iov,
+                        int count, void *cookie)
+{
+        struct syncargs       *args  = NULL;
+        gd1_mgmt_stage_op_rsp  rsp   = {{0},};
+        int                    ret   = -1;
+
+        args = cookie;
+
+        /* initialize */
+        args->op_ret   = -1;
+        args->op_errno = EINVAL;
+
+        if (-1 == req->rpc_status) {
+                args->op_errno = ENOTCONN;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_stage_op_rsp);
+        if (ret < 0) {
+                goto out;
+        }
+
+        if (rsp.dict.dict_len) {
+                /* Unserialize the dictionary */
+                args->dict  = dict_new ();
+
+                ret = dict_unserialize (rsp.dict.dict_val,
+                                        rsp.dict.dict_len,
+                                        &args->dict);
+                if (ret < 0) {
+                        GF_FREE (rsp.dict.dict_val);
+                        goto out;
+                } else {
+                        args->dict->extra_stdfree = rsp.dict.dict_val;
+                }
+        }
+
+        args->op_ret = rsp.op_ret;
+        args->op_errno = rsp.op_errno;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        args->errstr = gf_strdup (rsp.op_errstr);
+
+out:
+        __wake (args);
+
+        return 0;
+}
+
+
+int
+gd_syncop_mgmt_stage_op (struct rpc_clnt *rpc, uuid_t my_uuid, uuid_t recv_uuid,
+                         int op, dict_t *dict_out, dict_t **dict_in,
+                         char **errstr)
+{
+        struct syncargs       args = {0, };
+        gd1_mgmt_stage_op_req req  = {{0},};
+        int                   ret  = 0;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+
+        args.op_ret = -1;
+        args.op_errno = ENOTCONN;
+
+        ret = dict_allocate_and_serialize (dict_out, &req.buf.buf_val,
+                                           (size_t *)&req.buf.buf_len);
+        if (ret)
+                goto out;
+
+        GD_SYNCOP (rpc, (&args), gd_syncop_stage_op_cbk,
+                   &req, &gd_mgmt_prog, GLUSTERD_MGMT_STAGE_OP,
+                   xdr_gd1_mgmt_stage_op_req);
+
+        if (args.errstr && errstr)
+                *errstr = args.errstr;
+        else if (args.errstr)
+                GF_FREE (args.errstr);
+
+        if (args.dict && dict_in)
+                *dict_in = args.dict;
+        else if (args.dict)
+                dict_unref (args.dict);
+
+        uuid_copy (recv_uuid, args.uuid);
+out:
+        errno = args.op_errno;
+        return args.op_ret;
+
+}
+
+int32_t
+gd_syncop_commit_op_cbk (struct rpc_req *req, struct iovec *iov,
+                         int count, void *cookie)
+{
+        struct syncargs        *args  = NULL;
+        gd1_mgmt_commit_op_rsp  rsp   = {{0},};
+        int                     ret   = -1;
+
+        args = cookie;
+
+        /* initialize */
+        args->op_ret   = -1;
+        args->op_errno = EINVAL;
+
+        if (-1 == req->rpc_status) {
+                args->op_errno = ENOTCONN;
+                goto out;
+        }
+
+        ret = xdr_to_generic (*iov, &rsp,
+                              (xdrproc_t)xdr_gd1_mgmt_commit_op_rsp);
+        if (ret < 0) {
+                goto out;
+        }
+
+        if (rsp.dict.dict_len) {
+                /* Unserialize the dictionary */
+                args->dict  = dict_new ();
+
+                ret = dict_unserialize (rsp.dict.dict_val,
+                                        rsp.dict.dict_len,
+                                        &args->dict);
+                if (ret < 0) {
+                        GF_FREE (rsp.dict.dict_val);
+                        goto out;
+                } else {
+                        args->dict->extra_stdfree = rsp.dict.dict_val;
+                }
+        }
+
+        args->op_ret = rsp.op_ret;
+        args->op_errno = rsp.op_errno;
+
+        uuid_copy (args->uuid, rsp.uuid);
+
+        args->errstr = gf_strdup (rsp.op_errstr);
+
+out:
+        __wake (args);
+
+        return 0;
+}
+
+
+int
+gd_syncop_mgmt_commit_op (struct rpc_clnt *rpc, uuid_t my_uuid, uuid_t recv_uuid,
+                          int op, dict_t *dict_out, dict_t **dict_in,
+                          char **errstr)
+{
+        struct syncargs        args = {0, };
+        gd1_mgmt_commit_op_req req  = {{0},};
+        int                    ret  = 0;
+
+        uuid_copy (req.uuid, my_uuid);
+        req.op = op;
+
+        args.op_ret = -1;
+        args.op_errno = ENOTCONN;
+
+        ret = dict_allocate_and_serialize (dict_out, &req.buf.buf_val,
+                                           (size_t *)&req.buf.buf_len);
+        if (ret)
+                goto out;
+
+        GD_SYNCOP (rpc, (&args), gd_syncop_commit_op_cbk,
+                   &req, &gd_mgmt_prog, GLUSTERD_MGMT_COMMIT_OP,
+                   xdr_gd1_mgmt_commit_op_req);
+
+        if (args.errstr && errstr)
+                *errstr = args.errstr;
+        else if (args.errstr)
+                GF_FREE (args.errstr);
+
+        if (args.dict && dict_in)
+                *dict_in = args.dict;
+        else if (args.dict)
+                dict_unref (args.dict);
+
+        uuid_copy (recv_uuid, args.uuid);
+
+out:
+        errno = args.op_errno;
+        return args.op_ret;
+
+}