protocol: implement seek() FOP

Network protocol extensions for the seek() FOP. The format is based on
the SEEK procedure in NFSv4.2.

Change-Id: I060768a8a4b9b1c80f4a24c0f17d630f7f028690
BUG: 1220173
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/11482
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Jeff Darcy <jdarcy@redhat.com>

3 files changed, 134 insertions, 3 deletions

diff --git a/xlators/protocol/server/src/server-messages.h b/xlators/protocol/server/src/server-messages.h
index 700af57143a..7f560663af8 100644
--- a/xlators/protocol/server/src/server-messages.h
+++ b/xlators/protocol/server/src/server-messages.h
@@ -40,7 +40,7 @@
  */
 
 #define GLFS_PS_BASE                GLFS_MSGID_COMP_PS
-#define GLFS_NUM_MESSAGES           88
+#define GLFS_NUM_MESSAGES           89
 #define GLFS_MSGID_END              (GLFS_PS_BASE + GLFS_NUM_MESSAGES + 1)
 /* Messages with message IDs */
 #define glfs_msg_start_x GLFS_PS_BASE, "Invalid: Start of messages"
@@ -830,6 +830,15 @@
  */
 
 #define PS_MSG_SERVER_IPC_INFO                  (GLFS_PS_BASE + 88)
+
+/*!
+ * @messageid
+ * @diagnosis
+ * @recommendedaction
+ *
+ */
+
+#define PS_MSG_SEEK_INFO                        (GLFS_PS_BASE + 89)
 /*------------*/
 #define glfs_msg_end_x GLFS_MSGID_END, "Invalid: End of messages"
 
diff --git a/xlators/protocol/server/src/server-rpc-fops.c b/xlators/protocol/server/src/server-rpc-fops.c
index 28af53ee05f..9a7d8eb71ed 100644
--- a/xlators/protocol/server/src/server-rpc-fops.c
+++ b/xlators/protocol/server/src/server-rpc-fops.c
@@ -2116,6 +2116,45 @@ out:
 }
 
 
+int
+server_seek_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, off_t offset, dict_t *xdata)
+{
+        struct gfs3_seek_rsp   rsp    = {0, };
+        server_state_t        *state  = NULL;
+        rpcsvc_request_t      *req    = NULL;
+
+        req = frame->local;
+        state  = CALL_STATE (frame);
+
+        GF_PROTOCOL_DICT_SERIALIZE (this, xdata, (&rsp.xdata.xdata_val),
+                                    rsp.xdata.xdata_len, op_errno, out);
+
+        if (op_ret) {
+                gf_msg (this->name, GF_LOG_INFO, op_errno,
+                        PS_MSG_SEEK_INFO,
+                        "%"PRId64": SEEK%"PRId64" (%s) ==> (%s)",
+                        frame->root->unique, state->resolve.fd_no,
+                        uuid_utoa (state->resolve.gfid),
+                        strerror (op_errno));
+                goto out;
+        }
+
+        rsp.offset    = offset;
+
+out:
+        rsp.op_ret    = op_ret;
+        rsp.op_errno  = gf_errno_to_error (op_errno);
+
+        server_submit_reply (frame, req, &rsp, NULL, 0, NULL,
+                             (xdrproc_t) xdr_gfs3_seek_rsp);
+
+        GF_FREE (rsp.xdata.xdata_val);
+
+        return 0;
+}
+
+
 /* Resume function section */
 
 int
@@ -3165,6 +3204,26 @@ err:
         return 0;
 }
 
+int
+server_seek_resume (call_frame_t *frame, xlator_t *bound_xl)
+{
+        server_state_t *state = NULL;
+
+        state = CALL_STATE (frame);
+
+        if (state->resolve.op_ret != 0)
+                goto err;
+
+        STACK_WIND (frame, server_seek_cbk, bound_xl, bound_xl->fops->seek,
+                    state->fd, state->offset, state->what, state->xdata);
+        return 0;
+err:
+        server_seek_cbk (frame, NULL, frame->this, state->resolve.op_ret,
+                         state->resolve.op_errno, 0, NULL);
+
+        return 0;
+}
+
 
 
 /* Fop section */
@@ -3585,6 +3644,67 @@ out:
 }
 
 int
+server3_3_seek (rpcsvc_request_t *req)
+{
+        server_state_t        *state          = NULL;
+        call_frame_t          *frame          = NULL;
+        struct gfs3_seek_req   args           = {{0,},};
+        int                    ret            = -1;
+        int                    op_errno       = 0;
+        dict_t                *xdata          = NULL;
+        xlator_t              *bound_xl       = NULL;
+
+        if (!req)
+                return ret;
+
+        ret = xdr_to_generic (req->msg[0], &args,
+                              (xdrproc_t)xdr_gfs3_seek_req);
+        if (ret < 0) {
+                /*failed to decode msg*/;
+                req->rpc_err = GARBAGE_ARGS;
+                goto out;
+        }
+
+        frame = get_frame_from_request (req);
+        if (!frame) {
+                /* something wrong, mostly insufficient memory*/
+                req->rpc_err = GARBAGE_ARGS; /* TODO */
+                goto out;
+        }
+        frame->root->op = GF_FOP_SEEK;
+
+        state = CALL_STATE (frame);
+        if (!frame->root->client->bound_xl) {
+                /* auth failure, request on subvolume without setvolume */
+                SERVER_REQ_SET_ERROR (req, ret);
+                goto out;
+        }
+
+        state->resolve.type   = RESOLVE_MUST;
+        state->resolve.fd_no  = args.fd;
+
+        state->offset = args.offset;
+        state->what = args.what;
+        memcpy(state->resolve.gfid, args.gfid, 16);
+
+        GF_PROTOCOL_DICT_UNSERIALIZE (bound_xl, xdata,
+                                      args.xdata.xdata_val,
+                                      args.xdata.xdata_len,
+                                      ret, op_errno, out);
+
+        ret = 0;
+        resolve_and_resume (frame, server_seek_resume);
+
+out:
+        free (args.xdata.xdata_val);
+
+        if (op_errno)
+                SERVER_REQ_SET_ERROR (req, ret);
+
+        return ret;
+}
+
+int
 server3_3_readlink (rpcsvc_request_t *req)
 {
         server_state_t    *state                 = NULL;
@@ -6316,8 +6436,9 @@ rpcsvc_actor_t glusterfs3_3_fop_actors[GLUSTER_FOP_PROCCNT] = {
         [GFS3_OP_FREMOVEXATTR] = {"FREMOVEXATTR", GFS3_OP_FREMOVEXATTR, server3_3_fremovexattr, NULL, 0, DRC_NA},
         [GFS3_OP_FALLOCATE]    = {"FALLOCATE",    GFS3_OP_FALLOCATE,    server3_3_fallocate,    NULL, 0, DRC_NA},
         [GFS3_OP_DISCARD]      = {"DISCARD",      GFS3_OP_DISCARD,      server3_3_discard,      NULL, 0, DRC_NA},
-        [GFS3_OP_ZEROFILL]    =  {"ZEROFILL",     GFS3_OP_ZEROFILL,     server3_3_zerofill,     NULL, 0, DRC_NA},
-        [GFS3_OP_IPC]         =  {"IPC",          GFS3_OP_IPC,          server3_3_ipc,          NULL, 0, DRC_NA},
+        [GFS3_OP_ZEROFILL]     = {"ZEROFILL",     GFS3_OP_ZEROFILL,     server3_3_zerofill,     NULL, 0, DRC_NA},
+        [GFS3_OP_IPC]          = {"IPC",          GFS3_OP_IPC,          server3_3_ipc,          NULL, 0, DRC_NA},
+        [GFS3_OP_SEEK]         = {"SEEK",         GFS3_OP_SEEK,         server3_3_seek,         NULL, 0, DRC_NA},
 };
 
 
diff --git a/xlators/protocol/server/src/server.h b/xlators/protocol/server/src/server.h
index ccd2b232207..c0e2752cad7 100644
--- a/xlators/protocol/server/src/server.h
+++ b/xlators/protocol/server/src/server.h
@@ -151,6 +151,7 @@ struct _server_state {
         struct gf_flock   flock;
         const char       *volume;
         dir_entry_t      *entry;
+        gf_seek_what_t    what;
 
         dict_t           *xdata;
         mode_t            umask;