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Subject[PATCH 08/11] firewire-sbp-target: Add sbp_login.{c,h}
Date
This file contains the implementation of the login, reconnect and logout
management ORBs in SBP-2.

Signed-off-by: Chris Boot <bootc@bootc.net>
Cc: Andy Grover <agrover@redhat.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Nicholas A. Bellinger <nab@linux-iscsi.org>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
drivers/target/sbp/sbp_login.c | 672 ++++++++++++++++++++++++++++++++++++++++
drivers/target/sbp/sbp_login.h | 17 +
2 files changed, 689 insertions(+)
create mode 100644 drivers/target/sbp/sbp_login.c
create mode 100644 drivers/target/sbp/sbp_login.h

diff --git a/drivers/target/sbp/sbp_login.c b/drivers/target/sbp/sbp_login.c
new file mode 100644
index 0000000..bbcc618
--- /dev/null
+++ b/drivers/target/sbp/sbp_login.c
@@ -0,0 +1,672 @@
+/*
+ * SBP2 target driver (SCSI over IEEE1394 in target mode)
+ *
+ * Copyright (C) 2011 Chris Boot <bootc@bootc.net>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define KMSG_COMPONENT "sbp_target"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kref.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/slab.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+
+#include "sbp_base.h"
+#include "sbp_management_agent.h"
+#include "sbp_login.h"
+#include "sbp_target_agent.h"
+#include "sbp_scsi_cmnd.h"
+
+#define SESSION_MAINTENANCE_INTERVAL HZ
+
+static atomic_t login_id = ATOMIC_INIT(0);
+
+static void session_maintenance_work(struct work_struct *work);
+
+static int read_peer_guid(u64 *guid, const struct sbp_management_request *req)
+{
+ int ret;
+ __be32 high, low;
+
+ ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
+ req->node_addr, req->generation, req->speed,
+ (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 3 * 4,
+ &high, sizeof(high));
+ if (ret != RCODE_COMPLETE)
+ return ret;
+
+ ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
+ req->node_addr, req->generation, req->speed,
+ (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 4 * 4,
+ &low, sizeof(low));
+ if (ret != RCODE_COMPLETE)
+ return ret;
+
+ *guid = (u64)be32_to_cpu(high) << 32 | be32_to_cpu(low);
+
+ return RCODE_COMPLETE;
+}
+
+static struct sbp_session *sbp_session_find_by_guid(
+ struct sbp_tpg *tpg, u64 guid)
+{
+ struct se_session *se_sess;
+ struct sbp_session *sess, *found = NULL;
+
+ spin_lock_bh(&tpg->se_tpg.session_lock);
+ list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
+ sess = se_sess->fabric_sess_ptr;
+ if (sess->guid == guid)
+ found = sess;
+ }
+ spin_unlock_bh(&tpg->se_tpg.session_lock);
+
+ return found;
+}
+
+static struct sbp_login_descriptor *sbp_login_find_by_lun(
+ struct sbp_session *session, struct se_lun *lun)
+{
+ struct sbp_login_descriptor *login, *found = NULL;
+
+ spin_lock_bh(&session->lock);
+ list_for_each_entry(login, &session->login_list, link) {
+ if (login->lun == lun)
+ found = login;
+ }
+ spin_unlock_bh(&session->lock);
+
+ return found;
+}
+
+static int sbp_login_count_all_by_lun(
+ struct sbp_tpg *tpg,
+ struct se_lun *lun,
+ int exclusive)
+{
+ struct se_session *se_sess;
+ struct sbp_session *sess;
+ struct sbp_login_descriptor *login;
+ int count = 0;
+
+ spin_lock_bh(&tpg->se_tpg.session_lock);
+ list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
+ sess = se_sess->fabric_sess_ptr;
+
+ spin_lock_bh(&sess->lock);
+ list_for_each_entry(login, &sess->login_list, link) {
+ if (login->lun != lun)
+ continue;
+
+ if (!exclusive || login->exclusive)
+ count++;
+ }
+ spin_unlock_bh(&sess->lock);
+ }
+ spin_unlock_bh(&tpg->se_tpg.session_lock);
+
+ return count;
+}
+
+static struct sbp_login_descriptor *sbp_login_find_by_id(
+ struct sbp_tpg *tpg, int login_id)
+{
+ struct se_session *se_sess;
+ struct sbp_session *sess;
+ struct sbp_login_descriptor *login, *found = NULL;
+
+ spin_lock_bh(&tpg->se_tpg.session_lock);
+ list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
+ sess = se_sess->fabric_sess_ptr;
+
+ spin_lock_bh(&sess->lock);
+ list_for_each_entry(login, &sess->login_list, link) {
+ if (login->login_id == login_id)
+ found = login;
+ }
+ spin_unlock_bh(&sess->lock);
+ }
+ spin_unlock_bh(&tpg->se_tpg.session_lock);
+
+ return found;
+}
+
+static struct se_lun *sbp_get_lun_from_tpg(struct sbp_tpg *tpg, int lun)
+{
+ struct se_portal_group *se_tpg = &tpg->se_tpg;
+ struct se_lun *se_lun;
+
+ if (lun >= TRANSPORT_MAX_LUNS_PER_TPG)
+ return ERR_PTR(-EINVAL);
+
+ spin_lock(&se_tpg->tpg_lun_lock);
+ se_lun = se_tpg->tpg_lun_list[lun];
+
+ if (se_lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
+ se_lun = ERR_PTR(-ENODEV);
+
+ spin_unlock(&se_tpg->tpg_lun_lock);
+
+ return se_lun;
+}
+
+static struct sbp_session *sbp_session_create(
+ struct sbp_tpg *tpg,
+ u64 guid)
+{
+ struct sbp_session *sess;
+ int ret;
+ char guid_str[17];
+ struct se_node_acl *se_nacl;
+
+ sess = kmalloc(sizeof(*sess), GFP_KERNEL);
+ if (!sess) {
+ pr_err("failed to allocate session descriptor\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ sess->se_sess = transport_init_session();
+ if (IS_ERR(sess->se_sess)) {
+ pr_err("failed to init se_session\n");
+
+ ret = PTR_ERR(sess->se_sess);
+ kfree(sess);
+ return ERR_PTR(ret);
+ }
+
+ snprintf(guid_str, sizeof(guid_str), "%016llx", guid);
+
+ se_nacl = core_tpg_check_initiator_node_acl(&tpg->se_tpg, guid_str);
+ if (!se_nacl) {
+ pr_warn("Node ACL not found for %s\n", guid_str);
+
+ transport_free_session(sess->se_sess);
+ kfree(sess);
+
+ return ERR_PTR(-EPERM);
+ }
+
+ sess->se_sess->se_node_acl = se_nacl;
+
+ spin_lock_init(&sess->lock);
+ INIT_LIST_HEAD(&sess->login_list);
+ INIT_DELAYED_WORK(&sess->maint_work, session_maintenance_work);
+
+ sess->guid = guid;
+
+ transport_register_session(&tpg->se_tpg, se_nacl, sess->se_sess, sess);
+
+ return sess;
+}
+
+static void sbp_session_release(struct sbp_session *sess, bool cancel_work)
+{
+ spin_lock_bh(&sess->lock);
+ if (!list_empty(&sess->login_list)) {
+ spin_unlock_bh(&sess->lock);
+ return;
+ }
+ spin_unlock_bh(&sess->lock);
+
+ if (cancel_work)
+ cancel_delayed_work_sync(&sess->maint_work);
+
+ transport_deregister_session_configfs(sess->se_sess);
+ transport_deregister_session(sess->se_sess);
+
+ if (sess->card)
+ fw_card_put(sess->card);
+
+ kfree(sess);
+}
+
+static void sbp_login_release(struct sbp_login_descriptor *login,
+ bool cancel_work)
+{
+ struct sbp_session *sess = login->sess;
+
+ /* FIXME: abort/wait on tasks */
+
+ sbp_target_agent_unregister(login->tgt_agt);
+
+ if (sess) {
+ spin_lock_bh(&sess->lock);
+ list_del(&login->link);
+ spin_unlock_bh(&sess->lock);
+
+ sbp_session_release(sess, cancel_work);
+ }
+
+ kfree(login);
+}
+
+void sbp_management_request_login(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size)
+{
+ struct sbp_tport *tport = agent->tport;
+ struct sbp_tpg *tpg = tport->tpg;
+ struct se_lun *se_lun;
+ int ret;
+ u64 guid;
+ struct sbp_session *sess;
+ struct sbp_login_descriptor *login;
+ struct sbp_login_response_block *response;
+ int login_response_len;
+
+ se_lun = sbp_get_lun_from_tpg(tpg,
+ LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
+ if (IS_ERR(se_lun)) {
+ pr_notice("login to unknown LUN: %d\n",
+ LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LUN_NOTSUPP));
+ return;
+ }
+
+ ret = read_peer_guid(&guid, req);
+ if (ret != RCODE_COMPLETE) {
+ pr_warn("failed to read peer GUID: %d\n", ret);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
+ return;
+ }
+
+ pr_notice("mgt_agent LOGIN to LUN %d from %016llx\n",
+ se_lun->unpacked_lun, guid);
+
+ sess = sbp_session_find_by_guid(tpg, guid);
+ if (sess) {
+ login = sbp_login_find_by_lun(sess, se_lun);
+ if (login) {
+ pr_notice("initiator already logged-in\n");
+
+ /*
+ * SBP-2 R4 says we should return access denied, but
+ * that can confuse initiators. Instead we need to
+ * treat this like a reconnect, but send the login
+ * response block like a fresh login.
+ *
+ * This is required particularly in the case of Apple
+ * devices booting off the FireWire target, where
+ * the firmware has an active login to the target. When
+ * the OS takes control of the session it issues its own
+ * LOGIN rather than a RECONNECT. To avoid the machine
+ * waiting until the reconnect_hold expires, we can skip
+ * the ACCESS_DENIED errors to speed things up.
+ */
+
+ goto already_logged_in;
+ }
+ }
+
+ /*
+ * check exclusive bit in login request
+ * reject with access_denied if any logins present
+ */
+ if (LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc)) &&
+ sbp_login_count_all_by_lun(tpg, se_lun, 0)) {
+ pr_warn("refusing exclusive login with other active logins\n");
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
+ return;
+ }
+
+ /*
+ * check exclusive bit in any existing login descriptor
+ * reject with access_denied if any exclusive logins present
+ */
+ if (sbp_login_count_all_by_lun(tpg, se_lun, 1)) {
+ pr_warn("refusing login while another exclusive login present\n");
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
+ return;
+ }
+
+ /*
+ * check we haven't exceeded the number of allowed logins
+ * reject with resources_unavailable if we have
+ */
+ if (sbp_login_count_all_by_lun(tpg, se_lun, 0) >=
+ tport->max_logins_per_lun) {
+ pr_warn("max number of logins reached\n");
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
+ return;
+ }
+
+ if (!sess) {
+ sess = sbp_session_create(tpg, guid);
+ if (IS_ERR(sess)) {
+ switch (PTR_ERR(sess)) {
+ case -EPERM:
+ ret = SBP_STATUS_ACCESS_DENIED;
+ break;
+ default:
+ ret = SBP_STATUS_RESOURCES_UNAVAIL;
+ break;
+ }
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(
+ STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(ret));
+ return;
+ }
+
+ sess->node_id = req->node_addr;
+ sess->card = fw_card_get(req->card);
+ sess->generation = req->generation;
+ sess->speed = req->speed;
+
+ schedule_delayed_work(&sess->maint_work,
+ SESSION_MAINTENANCE_INTERVAL);
+ }
+
+ /* only take the latest reconnect_hold into account */
+ sess->reconnect_hold = min(
+ 1 << LOGIN_ORB_RECONNECT(be32_to_cpu(req->orb.misc)),
+ tport->max_reconnect_timeout) - 1;
+
+ login = kmalloc(sizeof(*login), GFP_KERNEL);
+ if (!login) {
+ pr_err("failed to allocate login descriptor\n");
+
+ sbp_session_release(sess, true);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
+ return;
+ }
+
+ login->sess = sess;
+ login->lun = se_lun;
+ login->status_fifo_addr = sbp2_pointer_to_addr(&req->orb.status_fifo);
+ login->exclusive = LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc));
+ login->login_id = atomic_inc_return(&login_id);
+
+ login->tgt_agt = sbp_target_agent_register(login);
+ if (IS_ERR(login->tgt_agt)) {
+ ret = PTR_ERR(login->tgt_agt);
+ pr_err("failed to map command block handler: %d\n", ret);
+
+ sbp_session_release(sess, true);
+ kfree(login);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
+ return;
+ }
+
+ spin_lock_bh(&sess->lock);
+ list_add_tail(&login->link, &sess->login_list);
+ spin_unlock_bh(&sess->lock);
+
+already_logged_in:
+ response = kzalloc(sizeof(*response), GFP_KERNEL);
+ if (!response) {
+ pr_err("failed to allocate login response block\n");
+
+ sbp_login_release(login, true);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
+ return;
+ }
+
+ login_response_len = clamp_val(
+ LOGIN_ORB_RESPONSE_LENGTH(be32_to_cpu(req->orb.length)),
+ 12, sizeof(*response));
+ response->misc = cpu_to_be32(
+ ((login_response_len & 0xffff) << 16) |
+ (login->login_id & 0xffff));
+ response->reconnect_hold = cpu_to_be32(sess->reconnect_hold & 0xffff);
+ addr_to_sbp2_pointer(login->tgt_agt->handler.offset,
+ &response->command_block_agent);
+
+ ret = sbp_run_transaction(sess->card, TCODE_WRITE_BLOCK_REQUEST,
+ sess->node_id, sess->generation, sess->speed,
+ sbp2_pointer_to_addr(&req->orb.ptr2), response,
+ login_response_len);
+ if (ret != RCODE_COMPLETE) {
+ pr_debug("failed to write login response block: %x\n", ret);
+
+ kfree(response);
+ sbp_login_release(login, true);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
+ return;
+ }
+
+ kfree(response);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
+}
+
+void sbp_management_request_query_logins(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size)
+{
+ pr_notice("QUERY LOGINS not implemented\n");
+ /* FIXME: implement */
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
+}
+
+void sbp_management_request_reconnect(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size)
+{
+ struct sbp_tport *tport = agent->tport;
+ struct sbp_tpg *tpg = tport->tpg;
+ int ret;
+ u64 guid;
+ struct sbp_login_descriptor *login;
+
+ ret = read_peer_guid(&guid, req);
+ if (ret != RCODE_COMPLETE) {
+ pr_warn("failed to read peer GUID: %d\n", ret);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
+ return;
+ }
+
+ pr_notice("mgt_agent RECONNECT from %016llx\n", guid);
+
+ login = sbp_login_find_by_id(tpg,
+ RECONNECT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc)));
+
+ if (!login) {
+ pr_err("mgt_agent RECONNECT unknown login ID\n");
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
+ return;
+ }
+
+ if (login->sess->guid != guid) {
+ pr_err("mgt_agent RECONNECT login GUID doesn't match\n");
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
+ return;
+ }
+
+ spin_lock_bh(&login->sess->lock);
+ if (login->sess->card)
+ fw_card_put(login->sess->card);
+
+ /* update the node details */
+ login->sess->generation = req->generation;
+ login->sess->node_id = req->node_addr;
+ login->sess->card = fw_card_get(req->card);
+ login->sess->speed = req->speed;
+ spin_unlock_bh(&login->sess->lock);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
+}
+
+void sbp_management_request_logout(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size)
+{
+ struct sbp_tport *tport = agent->tport;
+ struct sbp_tpg *tpg = tport->tpg;
+ int login_id;
+ struct sbp_login_descriptor *login;
+
+ login_id = LOGOUT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc));
+
+ login = sbp_login_find_by_id(tpg, login_id);
+ if (!login) {
+ pr_warn("cannot find login: %d\n", login_id);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LOGIN_ID_UNKNOWN));
+ return;
+ }
+
+ pr_info("mgt_agent LOGOUT from LUN %d session %d\n",
+ login->lun->unpacked_lun, login->login_id);
+
+ if (req->node_addr != login->sess->node_id) {
+ pr_warn("logout from different node ID\n");
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
+ return;
+ }
+
+ sbp_login_release(login, true);
+
+ req->status.status = cpu_to_be32(
+ STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
+ STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
+}
+
+static void session_check_for_reset(struct sbp_session *sess)
+{
+ bool card_valid = false;
+
+ spin_lock_bh(&sess->lock);
+
+ if (sess->card) {
+ spin_lock_irq(&sess->card->lock);
+ card_valid = (sess->card->local_node != NULL);
+ spin_unlock_irq(&sess->card->lock);
+
+ if (!card_valid) {
+ fw_card_put(sess->card);
+ sess->card = NULL;
+ }
+ }
+
+ if (!card_valid || (sess->generation != sess->card->generation)) {
+ pr_info("Waiting for reconnect from node: %016llx\n",
+ sess->guid);
+
+ sess->node_id = -1;
+ sess->reconnect_expires = get_jiffies_64() +
+ ((sess->reconnect_hold + 1) * HZ);
+ }
+
+ spin_unlock_bh(&sess->lock);
+}
+
+static void session_reconnect_expired(struct sbp_session *sess)
+{
+ struct sbp_login_descriptor *login, *temp;
+ LIST_HEAD(login_list);
+
+ pr_info("Reconnect timer expired for node: %016llx\n", sess->guid);
+
+ spin_lock_bh(&sess->lock);
+ list_for_each_entry_safe(login, temp, &sess->login_list, link) {
+ login->sess = NULL;
+ list_del(&login->link);
+ list_add_tail(&login->link, &login_list);
+ }
+ spin_unlock_bh(&sess->lock);
+
+ list_for_each_entry_safe(login, temp, &login_list, link) {
+ list_del(&login->link);
+ sbp_login_release(login, false);
+ }
+
+ sbp_session_release(sess, false);
+}
+
+static void session_maintenance_work(struct work_struct *work)
+{
+ struct sbp_session *sess = container_of(work, struct sbp_session,
+ maint_work.work);
+
+ /* could be called while tearing down the session */
+ spin_lock_bh(&sess->lock);
+ if (list_empty(&sess->login_list)) {
+ spin_unlock_bh(&sess->lock);
+ return;
+ }
+ spin_unlock_bh(&sess->lock);
+
+ if (sess->node_id != -1) {
+ /* check for bus reset and make node_id invalid */
+ session_check_for_reset(sess);
+
+ schedule_delayed_work(&sess->maint_work,
+ SESSION_MAINTENANCE_INTERVAL);
+ } else if (!time_after64(get_jiffies_64(), sess->reconnect_expires)) {
+ /* still waiting for reconnect */
+ schedule_delayed_work(&sess->maint_work,
+ SESSION_MAINTENANCE_INTERVAL);
+ } else {
+ /* reconnect timeout has expired */
+ session_reconnect_expired(sess);
+ }
+}
+
diff --git a/drivers/target/sbp/sbp_login.h b/drivers/target/sbp/sbp_login.h
new file mode 100644
index 0000000..3b016f0
--- /dev/null
+++ b/drivers/target/sbp/sbp_login.h
@@ -0,0 +1,17 @@
+
+#include "sbp_base.h"
+#include "sbp_management_agent.h"
+
+extern void sbp_management_request_login(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size);
+extern void sbp_management_request_query_logins(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size);
+extern void sbp_management_request_reconnect(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size);
+extern void sbp_management_request_logout(
+ struct sbp_management_agent *agent, struct sbp_management_request *req,
+ int *status_data_size);
+
--
1.7.9.5


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