diff options
Diffstat (limited to 'xlators/mgmt/glusterd/src/glusterd-sm.c')
| -rw-r--r-- | xlators/mgmt/glusterd/src/glusterd-sm.c | 1109 |
1 files changed, 1109 insertions, 0 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-sm.c b/xlators/mgmt/glusterd/src/glusterd-sm.c new file mode 100644 index 000000000..c671edf68 --- /dev/null +++ b/xlators/mgmt/glusterd/src/glusterd-sm.c @@ -0,0 +1,1109 @@ +/* + Copyright (c) 2006-2012 Red Hat, Inc. <http://www.redhat.com> + This file is part of GlusterFS. + + This file is licensed to you under your choice of the GNU Lesser + General Public License, version 3 or any later version (LGPLv3 or + later), or the GNU General Public License, version 2 (GPLv2), in all + cases as published by the Free Software Foundation. +*/ + +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif +#include <time.h> +#include <sys/uio.h> +#include <sys/resource.h> + +#include <libgen.h> +#include "uuid.h" + +#include "fnmatch.h" +#include "xlator.h" +#include "protocol-common.h" +#include "glusterd.h" +#include "call-stub.h" +#include "defaults.h" +#include "list.h" +#include "dict.h" +#include "compat.h" +#include "compat-errno.h" +#include "statedump.h" +#include "glusterd-sm.h" +#include "glusterd-op-sm.h" +#include "glusterd-utils.h" +#include "glusterd-store.h" + +static struct list_head gd_friend_sm_queue; + +static char *glusterd_friend_sm_state_names[] = { + "Establishing Connection", + "Probe Sent to Peer", + "Probe Received from Peer", + "Peer in Cluster", + "Accepted peer request", + "Sent and Received peer request", + "Peer Rejected", + "Peer detach in progress", + "Probe Received from peer", + "Connected to Peer", + "Peer is connected and Accepted", + "Invalid State" +}; + +static char *glusterd_friend_sm_event_names[] = { + "GD_FRIEND_EVENT_NONE", + "GD_FRIEND_EVENT_PROBE", + "GD_FRIEND_EVENT_INIT_FRIEND_REQ", + "GD_FRIEND_EVENT_RCVD_ACC", + "GD_FRIEND_EVENT_LOCAL_ACC", + "GD_FRIEND_EVENT_RCVD_RJT", + "GD_FRIEND_EVENT_LOCAL_RJT", + "GD_FRIEND_EVENT_RCVD_FRIEND_REQ", + "GD_FRIEND_EVENT_INIT_REMOVE_FRIEND", + "GD_FRIEND_EVENT_RCVD_REMOVE_FRIEND", + "GD_FRIEND_EVENT_REMOVE_FRIEND", + "GD_FRIEND_EVENT_CONNECTED", + "GD_FRIEND_EVENT_MAX" +}; + +char* +glusterd_friend_sm_state_name_get (int state) +{ + if (state < 0 || state >= GD_FRIEND_STATE_MAX) + return glusterd_friend_sm_state_names[GD_FRIEND_STATE_MAX]; + return glusterd_friend_sm_state_names[state]; +} + +char* +glusterd_friend_sm_event_name_get (int event) +{ + if (event < 0 || event >= GD_FRIEND_EVENT_MAX) + return glusterd_friend_sm_event_names[GD_FRIEND_EVENT_MAX]; + return glusterd_friend_sm_event_names[event]; +} + +void +glusterd_destroy_probe_ctx (glusterd_probe_ctx_t *ctx) +{ + if (!ctx) + return; + + GF_FREE (ctx->hostname); + GF_FREE (ctx); +} + +void +glusterd_destroy_friend_req_ctx (glusterd_friend_req_ctx_t *ctx) +{ + if (!ctx) + return; + + if (ctx->vols) + dict_unref (ctx->vols); + GF_FREE (ctx->hostname); + GF_FREE (ctx); +} + +void +glusterd_destroy_friend_update_ctx (glusterd_friend_update_ctx_t *ctx) +{ + if (!ctx) + return; + GF_FREE (ctx->hostname); + GF_FREE (ctx); +} + +int +glusterd_broadcast_friend_delete (char *hostname, uuid_t uuid) +{ + int ret = 0; + rpc_clnt_procedure_t *proc = NULL; + xlator_t *this = NULL; + glusterd_friend_update_ctx_t ctx = {{0},}; + glusterd_peerinfo_t *peerinfo = NULL; + glusterd_conf_t *priv = NULL; + dict_t *friends = NULL; + char key[100] = {0,}; + int32_t count = 0; + + this = THIS; + priv = this->private; + + GF_ASSERT (priv); + + ctx.hostname = hostname; + ctx.op = GD_FRIEND_UPDATE_DEL; + + friends = dict_new (); + if (!friends) + goto out; + + snprintf (key, sizeof (key), "op"); + ret = dict_set_int32 (friends, key, ctx.op); + if (ret) + goto out; + + snprintf (key, sizeof (key), "hostname"); + ret = dict_set_str (friends, key, hostname); + if (ret) + goto out; + + ret = dict_set_int32 (friends, "count", count); + if (ret) + goto out; + + list_for_each_entry (peerinfo, &priv->peers, uuid_list) { + if (!peerinfo->connected || !peerinfo->peer) + continue; + + ret = dict_set_static_ptr (friends, "peerinfo", peerinfo); + if (ret) { + gf_log ("", GF_LOG_ERROR, "failed to set peerinfo"); + goto out; + } + + proc = &peerinfo->peer->proctable[GLUSTERD_FRIEND_UPDATE]; + if (proc->fn) { + ret = proc->fn (NULL, this, friends); + } + } + + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + +out: + if (friends) + dict_unref (friends); + + return ret; +} + + +static int +glusterd_ac_none (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = 0; + + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +} + +static int +glusterd_ac_error (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = 0; + + gf_log ("", GF_LOG_ERROR, "Received event %d ", event->event); + + return ret; +} + +static int +glusterd_ac_reverse_probe_begin (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = 0; + glusterd_peerinfo_t *peerinfo = NULL; + glusterd_friend_sm_event_t *new_event = NULL; + glusterd_probe_ctx_t *new_ev_ctx = NULL; + + GF_ASSERT (event); + GF_ASSERT (ctx); + + peerinfo = event->peerinfo; + ret = glusterd_friend_sm_new_event + (GD_FRIEND_EVENT_PROBE, &new_event); + + if (ret) { + gf_log ("glusterd", GF_LOG_ERROR, "Unable to get new new_event"); + ret = -1; + goto out; + } + + new_ev_ctx = GF_CALLOC (1, sizeof(*new_ev_ctx), gf_gld_mt_probe_ctx_t); + + if (!new_ev_ctx) { + ret = -1; + goto out; + } + + new_ev_ctx->hostname = gf_strdup (peerinfo->hostname); + new_ev_ctx->port = peerinfo->port; + new_ev_ctx->req = NULL; + + new_event->peerinfo = peerinfo; + new_event->ctx = new_ev_ctx; + + ret = glusterd_friend_sm_inject_event (new_event); + + if (ret) { + gf_log ("glusterd", GF_LOG_ERROR, "Unable to inject new_event %d, " + "ret = %d", new_event->event, ret); + } + +out: + if (ret) { + GF_FREE (new_event); + GF_FREE (new_ev_ctx->hostname); + GF_FREE (new_ev_ctx); + } + gf_log ("", GF_LOG_DEBUG, "returning with %d", ret); + return ret; +} + +static int +glusterd_ac_friend_add (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = 0; + glusterd_peerinfo_t *peerinfo = NULL; + rpc_clnt_procedure_t *proc = NULL; + call_frame_t *frame = NULL; + glusterd_conf_t *conf = NULL; + xlator_t *this = NULL; + + GF_ASSERT (event); + peerinfo = event->peerinfo; + + this = THIS; + conf = this->private; + + GF_ASSERT (conf); + + if (!peerinfo->peer) + goto out; + proc = &peerinfo->peer->proctable[GLUSTERD_FRIEND_ADD]; + if (proc->fn) { + frame = create_frame (this, this->ctx->pool); + if (!frame) { + goto out; + } + frame->local = ctx; + ret = proc->fn (frame, this, event); + } + +out: + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +} + +static int +glusterd_ac_friend_probe (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = -1; + rpc_clnt_procedure_t *proc = NULL; + call_frame_t *frame = NULL; + glusterd_conf_t *conf = NULL; + xlator_t *this = NULL; + glusterd_probe_ctx_t *probe_ctx = NULL; + glusterd_peerinfo_t *peerinfo = NULL; + dict_t *dict = NULL; + + GF_ASSERT (ctx); + + probe_ctx = ctx; + + this = THIS; + + GF_ASSERT (this); + + conf = this->private; + + GF_ASSERT (conf); + + ret = glusterd_friend_find (NULL, probe_ctx->hostname, &peerinfo); + if (ret) { + //We should not reach this state ideally + GF_ASSERT (0); + goto out; + } + + if (!peerinfo->peer) + goto out; + proc = &peerinfo->peer->proctable[GLUSTERD_PROBE_QUERY]; + if (proc->fn) { + frame = create_frame (this, this->ctx->pool); + if (!frame) { + goto out; + } + frame->local = ctx; + dict = dict_new (); + if (!dict) + goto out; + ret = dict_set_str (dict, "hostname", probe_ctx->hostname); + if (ret) + goto out; + + ret = dict_set_int32 (dict, "port", probe_ctx->port); + if (ret) + goto out; + + ret = dict_set_static_ptr (dict, "peerinfo", peerinfo); + if (ret) { + gf_log ("", GF_LOG_ERROR, "failed to set peerinfo"); + goto out; + } + + ret = proc->fn (frame, this, dict); + if (ret) + goto out; + + } + + +out: + if (dict) + dict_unref (dict); + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +} + +static int +glusterd_ac_send_friend_remove_req (glusterd_friend_sm_event_t *event, + void *data) +{ + int ret = 0; + glusterd_peerinfo_t *peerinfo = NULL; + rpc_clnt_procedure_t *proc = NULL; + call_frame_t *frame = NULL; + glusterd_conf_t *conf = NULL; + xlator_t *this = NULL; + glusterd_friend_sm_event_type_t event_type = GD_FRIEND_EVENT_NONE; + glusterd_probe_ctx_t *ctx = NULL; + glusterd_friend_sm_event_t *new_event = NULL; + + GF_ASSERT (event); + peerinfo = event->peerinfo; + + this = THIS; + conf = this->private; + + GF_ASSERT (conf); + + ctx = event->ctx; + + if (!peerinfo->connected) { + event_type = GD_FRIEND_EVENT_REMOVE_FRIEND; + + ret = glusterd_friend_sm_new_event (event_type, &new_event); + + if (!ret) { + new_event->peerinfo = peerinfo; + ret = glusterd_friend_sm_inject_event (new_event); + } else { + gf_log ("glusterd", GF_LOG_ERROR, + "Unable to get event"); + } + + if (ctx) + ret = glusterd_xfer_cli_deprobe_resp (ctx->req, ret, 0, + NULL, + ctx->hostname, + ctx->dict); + glusterd_friend_sm (); + glusterd_op_sm (); + + if (ctx) { + glusterd_broadcast_friend_delete (ctx->hostname, NULL); + glusterd_destroy_probe_ctx (ctx); + } + goto out; + } + + if (!peerinfo->peer) + goto out; + proc = &peerinfo->peer->proctable[GLUSTERD_FRIEND_REMOVE]; + if (proc->fn) { + frame = create_frame (this, this->ctx->pool); + if (!frame) { + goto out; + } + frame->local = data; + ret = proc->fn (frame, this, event); + } + +out: + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +} + +static gf_boolean_t +glusterd_should_update_peer (glusterd_peerinfo_t *peerinfo, + glusterd_peerinfo_t *cur_peerinfo) +{ + gf_boolean_t is_valid = _gf_false; + + if ((peerinfo == cur_peerinfo) || + (peerinfo->state.state == GD_FRIEND_STATE_BEFRIENDED)) + is_valid = _gf_true; + + return is_valid; +} + +static int +glusterd_ac_send_friend_update (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = 0; + glusterd_peerinfo_t *cur_peerinfo = NULL; + glusterd_peerinfo_t *peerinfo = NULL; + rpc_clnt_procedure_t *proc = NULL; + xlator_t *this = NULL; + glusterd_friend_update_ctx_t ev_ctx = {{0}}; + glusterd_conf_t *priv = NULL; + dict_t *friends = NULL; + char key[100] = {0,}; + char *dup_buf = NULL; + int32_t count = 0; + + GF_ASSERT (event); + cur_peerinfo = event->peerinfo; + + this = THIS; + priv = this->private; + + GF_ASSERT (priv); + + ev_ctx.op = GD_FRIEND_UPDATE_ADD; + + friends = dict_new (); + if (!friends) + goto out; + + snprintf (key, sizeof (key), "op"); + ret = dict_set_int32 (friends, key, ev_ctx.op); + if (ret) + goto out; + + list_for_each_entry (peerinfo, &priv->peers, uuid_list) { + if (!glusterd_should_update_peer (peerinfo, cur_peerinfo)) + continue; + + count++; + snprintf (key, sizeof (key), "friend%d.uuid", count); + dup_buf = gf_strdup (uuid_utoa (peerinfo->uuid)); + ret = dict_set_dynstr (friends, key, dup_buf); + if (ret) + goto out; + snprintf (key, sizeof (key), "friend%d.hostname", count); + ret = dict_set_str (friends, key, peerinfo->hostname); + if (ret) + goto out; + gf_log ("", GF_LOG_INFO, "Added uuid: %s, host: %s", + dup_buf, peerinfo->hostname); + } + + ret = dict_set_int32 (friends, "count", count); + if (ret) + goto out; + + list_for_each_entry (peerinfo, &priv->peers, uuid_list) { + if (!peerinfo->connected || !peerinfo->peer) + continue; + + if (!glusterd_should_update_peer (peerinfo, cur_peerinfo)) + continue; + + ret = dict_set_static_ptr (friends, "peerinfo", peerinfo); + if (ret) { + gf_log ("", GF_LOG_ERROR, "failed to set peerinfo"); + goto out; + } + + proc = &peerinfo->peer->proctable[GLUSTERD_FRIEND_UPDATE]; + if (proc->fn) { + ret = proc->fn (NULL, this, friends); + } + } + + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + +out: + if (friends) + dict_unref (friends); + + return ret; +} + +static int +glusterd_peer_detach_cleanup (glusterd_conf_t *priv) +{ + int ret = -1; + glusterd_volinfo_t *volinfo = NULL; + glusterd_volinfo_t *tmp_volinfo = NULL; + + GF_ASSERT (priv); + + list_for_each_entry_safe (volinfo,tmp_volinfo, + &priv->volumes, vol_list) { + if (!glusterd_friend_contains_vol_bricks (volinfo, + MY_UUID)) { + gf_log (THIS->name, GF_LOG_INFO, + "Deleting stale volume %s", volinfo->volname); + ret = glusterd_delete_volume (volinfo); + if (ret) { + gf_log (THIS->name, GF_LOG_ERROR, + "Error deleting stale volume"); + goto out; + } + } + } + ret = 0; +out: + gf_log (THIS->name, GF_LOG_DEBUG, "Returning %d", ret); + return ret; +} + +static int +glusterd_ac_handle_friend_remove_req (glusterd_friend_sm_event_t *event, + void *ctx) +{ + int ret = 0; + glusterd_peerinfo_t *peerinfo = NULL; + glusterd_friend_req_ctx_t *ev_ctx = NULL; + glusterd_friend_sm_event_t *new_event = NULL; + glusterd_conf_t *priv = NULL; + + GF_ASSERT (ctx); + ev_ctx = ctx; + peerinfo = event->peerinfo; + GF_ASSERT (peerinfo); + + priv = THIS->private; + GF_ASSERT (priv); + + ret = glusterd_xfer_friend_remove_resp (ev_ctx->req, ev_ctx->hostname, + ev_ctx->port); + + list_for_each_entry (peerinfo, &priv->peers, uuid_list) { + + ret = glusterd_friend_sm_new_event (GD_FRIEND_EVENT_REMOVE_FRIEND, + &new_event); + if (ret) + goto out; + + new_event->peerinfo = peerinfo; + + ret = glusterd_friend_sm_inject_event (new_event); + if (ret) + goto out; + } + ret = glusterd_peer_detach_cleanup (priv); + if (ret) { + gf_log (THIS->name, GF_LOG_WARNING, + "Peer detach cleanup was not successful"); + ret = 0; + } +out: + gf_log (THIS->name, GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +} + +static int +glusterd_ac_friend_remove (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = -1; + + ret = glusterd_friend_remove_cleanup_vols (event->peerinfo->uuid); + if (ret) + gf_log (THIS->name, GF_LOG_WARNING, "Volumes cleanup failed"); + + ret = glusterd_friend_cleanup (event->peerinfo); + if (ret) { + gf_log (THIS->name, GF_LOG_ERROR, "Cleanup returned: %d", ret); + } + + return 0; +} + +/*static int +glusterd_ac_none (void *ctx) +{ + int ret = 0; + + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +}*/ + +static int +glusterd_ac_handle_friend_add_req (glusterd_friend_sm_event_t *event, void *ctx) +{ + int ret = 0; + uuid_t uuid; + glusterd_peerinfo_t *peerinfo = NULL; + glusterd_friend_req_ctx_t *ev_ctx = NULL; + glusterd_friend_update_ctx_t *new_ev_ctx = NULL; + glusterd_friend_sm_event_t *new_event = NULL; + glusterd_friend_sm_event_type_t event_type = GD_FRIEND_EVENT_NONE; + int status = 0; + int32_t op_ret = -1; + int32_t op_errno = 0; + + GF_ASSERT (ctx); + ev_ctx = ctx; + uuid_copy (uuid, ev_ctx->uuid); + peerinfo = event->peerinfo; + GF_ASSERT (peerinfo); + uuid_copy (peerinfo->uuid, ev_ctx->uuid); + + //Build comparison logic here. + ret = glusterd_compare_friend_data (ev_ctx->vols, &status, + peerinfo->hostname); + if (ret) + goto out; + + if (GLUSTERD_VOL_COMP_RJT != status) { + event_type = GD_FRIEND_EVENT_LOCAL_ACC; + op_ret = 0; + } else { + event_type = GD_FRIEND_EVENT_LOCAL_RJT; + op_errno = GF_PROBE_VOLUME_CONFLICT; + op_ret = -1; + } + + ret = glusterd_friend_sm_new_event (event_type, &new_event); + + if (ret) { + gf_log ("", GF_LOG_ERROR, "Out of Memory"); + } + + new_event->peerinfo = peerinfo; + + new_ev_ctx = GF_CALLOC (1, sizeof (*new_ev_ctx), + gf_gld_mt_friend_update_ctx_t); + if (!new_ev_ctx) { + ret = -1; + goto out; + } + + uuid_copy (new_ev_ctx->uuid, ev_ctx->uuid); + new_ev_ctx->hostname = gf_strdup (ev_ctx->hostname); + new_ev_ctx->op = GD_FRIEND_UPDATE_ADD; + + new_event->ctx = new_ev_ctx; + + glusterd_friend_sm_inject_event (new_event); + + ret = glusterd_xfer_friend_add_resp (ev_ctx->req, ev_ctx->hostname, + peerinfo->hostname, ev_ctx->port, + op_ret, op_errno); + +out: + gf_log ("", GF_LOG_DEBUG, "Returning with %d", ret); + + return ret; +} + +static int +glusterd_friend_sm_transition_state (glusterd_peerinfo_t *peerinfo, + glusterd_sm_t *state, + glusterd_friend_sm_event_type_t event_type) +{ + + GF_ASSERT (state); + GF_ASSERT (peerinfo); + + (void) glusterd_sm_tr_log_transition_add (&peerinfo->sm_log, + peerinfo->state.state, + state[event_type].next_state, + event_type); + + peerinfo->state.state = state[event_type].next_state; + return 0; +} + + +glusterd_sm_t glusterd_state_default [] = { + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_probe},//EV_PROBE + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_friend_add}, //EV_INIT_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EV_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_probe}, //EVENT_CONNECTED + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_MAX +}; + +glusterd_sm_t glusterd_state_probe_rcvd [] = { + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, //EV_PROBE + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, //EV_INIT_FRIEND_REQ + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_PROBE_RCVD, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EV_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EVENT_CONNECTED + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_MAX +}; + +glusterd_sm_t glusterd_state_connected_rcvd [] = { + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EV_PROBE + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EV_INIT_FRIEND_REQ + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_reverse_probe_begin}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EV_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EVENT_CONNECTED + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none}, //EVENT_MAX +}; + +glusterd_sm_t glusterd_state_connected_accepted [] = { + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_friend_probe}, //EV_PROBE + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_friend_add}, //EV_INIT_FRIEND_REQ + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EV_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_none}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_CONNECTED + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_none}, //EVENT_MAX +}; + +glusterd_sm_t glusterd_state_req_sent [] = { + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none}, //EVENT_PROBE, + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND, + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none},//EVENT_CONNECTED + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t glusterd_state_req_rcvd [] = { + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_PROBE, + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND, + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_handle_friend_remove_req}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_CONNECTED_RCVD, glusterd_ac_none},//EVENT_CONNECTED + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t glusterd_state_befriended [] = { + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none}, //EVENT_PROBE, + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_send_friend_update}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND, + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_handle_friend_remove_req}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_friend_add},//EVENT_CONNECTED + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t glusterd_state_req_sent_rcvd [] = { + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_PROBE, + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_send_friend_update}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND, + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_handle_friend_remove_req}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none},//EVENT_CONNECTED + {GD_FRIEND_STATE_REQ_SENT_RCVD, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t glusterd_state_rejected [] = { + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_REJECTED, glusterd_ac_friend_probe}, //EVENT_PROBE, + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_friend_add}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_handle_friend_remove_req}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_REJECTED, glusterd_ac_friend_add},//EVENT_CONNECTED + {GD_FRIEND_STATE_REQ_RCVD, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t glusterd_state_req_accepted [] = { + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_none}, //EVENT_PROBE, + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_none}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_send_friend_update}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_BEFRIENDED, glusterd_ac_send_friend_update}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_REJECTED, glusterd_ac_none}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_handle_friend_add_req}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_REQ_ACCEPTED, glusterd_ac_send_friend_remove_req}, //EVENT_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_handle_friend_remove_req}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_CONNECTED_ACCEPTED, glusterd_ac_reverse_probe_begin},//EVENT_CONNECTED + {GD_FRIEND_STATE_REQ_SENT, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t glusterd_state_unfriend_sent [] = { + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none}, //EVENT_NONE, + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_error}, //EVENT_PROBE, + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none}, //EVENT_INIT_FRIEND_REQ, + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none}, //EVENT_RCVD_ACC + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none}, //EVENT_RCVD_LOCAL_ACC + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_error}, //EVENT_RCVD_RJT + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_error}, //EVENT_RCVD_LOCAL_RJT + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_error}, //EVENT_RCV_FRIEND_REQ + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none}, //EVENT_INIT_REMOVE_FRIEND + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none}, //EVENT_RCVD_REMOVE_FRIEND + {GD_FRIEND_STATE_DEFAULT, glusterd_ac_friend_remove}, //EVENT_REMOVE_FRIEND + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none},//EVENT_CONNECTED + {GD_FRIEND_STATE_UNFRIEND_SENT, glusterd_ac_none},//EVENT_MAX +}; + +glusterd_sm_t *glusterd_friend_state_table [] = { + glusterd_state_default, + glusterd_state_req_sent, + glusterd_state_req_rcvd, + glusterd_state_befriended, + glusterd_state_req_accepted, + glusterd_state_req_sent_rcvd, + glusterd_state_rejected, + glusterd_state_unfriend_sent, + glusterd_state_probe_rcvd, + glusterd_state_connected_rcvd, + glusterd_state_connected_accepted +}; + +int +glusterd_friend_sm_new_event (glusterd_friend_sm_event_type_t event_type, + glusterd_friend_sm_event_t **new_event) +{ + glusterd_friend_sm_event_t *event = NULL; + + GF_ASSERT (new_event); + GF_ASSERT (GD_FRIEND_EVENT_NONE <= event_type && + GD_FRIEND_EVENT_MAX > event_type); + + event = GF_CALLOC (1, sizeof (*event), gf_gld_mt_friend_sm_event_t); + + if (!event) + return -1; + + *new_event = event; + event->event = event_type; + INIT_LIST_HEAD (&event->list); + + return 0; +} + +int +glusterd_friend_sm_inject_event (glusterd_friend_sm_event_t *event) +{ + GF_ASSERT (event); + gf_log ("glusterd", GF_LOG_DEBUG, "Enqueue event: '%s'", + glusterd_friend_sm_event_name_get (event->event)); + list_add_tail (&event->list, &gd_friend_sm_queue); + + return 0; +} + +void +glusterd_destroy_friend_event_context (glusterd_friend_sm_event_t *event) +{ + if (!event) + return; + + switch (event->event) { + case GD_FRIEND_EVENT_RCVD_FRIEND_REQ: + case GD_FRIEND_EVENT_RCVD_REMOVE_FRIEND: + glusterd_destroy_friend_req_ctx (event->ctx); + break; + case GD_FRIEND_EVENT_LOCAL_ACC: + case GD_FRIEND_EVENT_LOCAL_RJT: + case GD_FRIEND_EVENT_RCVD_ACC: + case GD_FRIEND_EVENT_RCVD_RJT: + glusterd_destroy_friend_update_ctx (event->ctx); + break; + default: + break; + } +} + +gf_boolean_t +gd_does_peer_affect_quorum (glusterd_friend_sm_state_t old_state, + glusterd_friend_sm_event_type_t event_type, + glusterd_peerinfo_t *peerinfo) +{ + gf_boolean_t affects = _gf_false; + + //When glusterd comes up with friends in BEFRIENDED state in store, + //wait until compare-data happens. + if ((old_state == GD_FRIEND_STATE_BEFRIENDED) && + (event_type != GD_FRIEND_EVENT_RCVD_ACC) && + (event_type != GD_FRIEND_EVENT_LOCAL_ACC)) + goto out; + if ((peerinfo->state.state == GD_FRIEND_STATE_BEFRIENDED) + && peerinfo->connected) { + affects = _gf_true; + } +out: + return affects; +} + +int +glusterd_friend_sm () +{ + glusterd_friend_sm_event_t *event = NULL; + glusterd_friend_sm_event_t *tmp = NULL; + int ret = -1; + glusterd_friend_sm_ac_fn handler = NULL; + glusterd_sm_t *state = NULL; + glusterd_peerinfo_t *peerinfo = NULL; + glusterd_friend_sm_event_type_t event_type = 0; + gf_boolean_t is_await_conn = _gf_false; + gf_boolean_t quorum_action = _gf_false; + glusterd_friend_sm_state_t old_state = GD_FRIEND_STATE_DEFAULT; + + while (!list_empty (&gd_friend_sm_queue)) { + list_for_each_entry_safe (event, tmp, &gd_friend_sm_queue, list) { + + list_del_init (&event->list); + event_type = event->event; + peerinfo = event->peerinfo; + if (!peerinfo) { + gf_log ("glusterd", GF_LOG_CRITICAL, "Received" + " event %s with empty peer info", + glusterd_friend_sm_event_name_get (event_type)); + + GF_FREE (event); + continue; + } + gf_log ("", GF_LOG_DEBUG, "Dequeued event of type: '%s'", + glusterd_friend_sm_event_name_get (event_type)); + + + old_state = peerinfo->state.state; + state = glusterd_friend_state_table[peerinfo->state.state]; + + GF_ASSERT (state); + + handler = state[event_type].handler; + GF_ASSERT (handler); + + ret = handler (event, event->ctx); + if (ret == GLUSTERD_CONNECTION_AWAITED) { + is_await_conn = _gf_true; + ret = 0; + } + + if (ret) { + gf_log ("glusterd", GF_LOG_ERROR, "handler returned: " + "%d", ret); + glusterd_destroy_friend_event_context (event); + GF_FREE (event); + continue; + } + + if ((GD_FRIEND_EVENT_REMOVE_FRIEND == event_type) || + (GD_FRIEND_EVENT_INIT_REMOVE_FRIEND == event_type)){ + glusterd_destroy_friend_event_context (event); + GF_FREE (event); + continue; + } + + ret = glusterd_friend_sm_transition_state (peerinfo, + state, event_type); + + if (ret) { + gf_log ("glusterd", GF_LOG_ERROR, "Unable to transition" + " state from '%s' to '%s' for event '%s'", + glusterd_friend_sm_state_name_get(peerinfo->state.state), + glusterd_friend_sm_state_name_get(state[event_type].next_state), + glusterd_friend_sm_event_name_get(event_type)); + goto out; + } + + if (gd_does_peer_affect_quorum (old_state, event_type, + peerinfo)) { + peerinfo->quorum_contrib = QUORUM_UP; + if (peerinfo->quorum_action) { + peerinfo->quorum_action = _gf_false; + quorum_action = _gf_true; + } + } + + ret = glusterd_store_peerinfo (peerinfo); + + glusterd_destroy_friend_event_context (event); + GF_FREE (event); + if (is_await_conn) + break; + } + if (is_await_conn) + break; + } + + ret = 0; +out: + if (quorum_action) { + /* When glusterd is restarted, it needs to wait until the 'friends' view + * of the volumes settle, before it starts any of the internal daemons. + * + * Every friend that was part of the cluster, would send its + * cluster-view, 'our' way. For every friend, who belongs to + * a partition which has a different cluster-view from our + * partition, we may update our cluster-view. For subsequent + * friends from that partition would agree with us, if the first + * friend wasn't rejected. For every first friend, whom we agreed with, + * we would need to start internal daemons/bricks belonging to the + * new volumes. + * glusterd_spawn_daemons calls functions that are idempotent. ie, + * the functions spawn process(es) only if they are not started yet. + * + * */ + glusterd_spawn_daemons (NULL); + glusterd_do_quorum_action (); + } + return ret; +} + + +int +glusterd_friend_sm_init () +{ + INIT_LIST_HEAD (&gd_friend_sm_queue); + return 0; +} |