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429 lines
12 KiB
429 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/******************************************************************************* |
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* This file contains error recovery level two functions used by |
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* the iSCSI Target driver. |
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* |
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* (c) Copyright 2007-2013 Datera, Inc. |
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* |
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* Author: Nicholas A. Bellinger <[email protected]> |
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* |
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******************************************************************************/ |
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#include <linux/slab.h> |
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#include <scsi/iscsi_proto.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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#include <target/iscsi/iscsi_target_core.h> |
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#include "iscsi_target_datain_values.h" |
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#include "iscsi_target_util.h" |
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#include "iscsi_target_erl0.h" |
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#include "iscsi_target_erl1.h" |
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#include "iscsi_target_erl2.h" |
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#include "iscsi_target.h" |
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/* |
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* FIXME: Does RData SNACK apply here as well? |
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*/ |
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void iscsit_create_conn_recovery_datain_values( |
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struct iscsi_cmd *cmd, |
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__be32 exp_data_sn) |
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{ |
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u32 data_sn = 0; |
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struct iscsi_conn *conn = cmd->conn; |
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cmd->next_burst_len = 0; |
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cmd->read_data_done = 0; |
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while (be32_to_cpu(exp_data_sn) > data_sn) { |
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if ((cmd->next_burst_len + |
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conn->conn_ops->MaxRecvDataSegmentLength) < |
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conn->sess->sess_ops->MaxBurstLength) { |
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cmd->read_data_done += |
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conn->conn_ops->MaxRecvDataSegmentLength; |
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cmd->next_burst_len += |
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conn->conn_ops->MaxRecvDataSegmentLength; |
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} else { |
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cmd->read_data_done += |
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(conn->sess->sess_ops->MaxBurstLength - |
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cmd->next_burst_len); |
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cmd->next_burst_len = 0; |
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} |
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data_sn++; |
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} |
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} |
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void iscsit_create_conn_recovery_dataout_values( |
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struct iscsi_cmd *cmd) |
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{ |
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u32 write_data_done = 0; |
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struct iscsi_conn *conn = cmd->conn; |
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cmd->data_sn = 0; |
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cmd->next_burst_len = 0; |
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while (cmd->write_data_done > write_data_done) { |
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if ((write_data_done + conn->sess->sess_ops->MaxBurstLength) <= |
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cmd->write_data_done) |
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write_data_done += conn->sess->sess_ops->MaxBurstLength; |
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else |
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break; |
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} |
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cmd->write_data_done = write_data_done; |
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} |
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static int iscsit_attach_active_connection_recovery_entry( |
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struct iscsi_session *sess, |
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struct iscsi_conn_recovery *cr) |
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{ |
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spin_lock(&sess->cr_a_lock); |
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list_add_tail(&cr->cr_list, &sess->cr_active_list); |
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spin_unlock(&sess->cr_a_lock); |
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return 0; |
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} |
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static int iscsit_attach_inactive_connection_recovery_entry( |
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struct iscsi_session *sess, |
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struct iscsi_conn_recovery *cr) |
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{ |
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spin_lock(&sess->cr_i_lock); |
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list_add_tail(&cr->cr_list, &sess->cr_inactive_list); |
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sess->conn_recovery_count++; |
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pr_debug("Incremented connection recovery count to %u for" |
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" SID: %u\n", sess->conn_recovery_count, sess->sid); |
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spin_unlock(&sess->cr_i_lock); |
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return 0; |
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} |
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struct iscsi_conn_recovery *iscsit_get_inactive_connection_recovery_entry( |
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struct iscsi_session *sess, |
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u16 cid) |
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{ |
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struct iscsi_conn_recovery *cr; |
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spin_lock(&sess->cr_i_lock); |
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list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { |
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if (cr->cid == cid) { |
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spin_unlock(&sess->cr_i_lock); |
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return cr; |
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} |
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} |
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spin_unlock(&sess->cr_i_lock); |
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return NULL; |
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} |
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void iscsit_free_connection_recovery_entries(struct iscsi_session *sess) |
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{ |
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struct iscsi_cmd *cmd, *cmd_tmp; |
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struct iscsi_conn_recovery *cr, *cr_tmp; |
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spin_lock(&sess->cr_a_lock); |
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list_for_each_entry_safe(cr, cr_tmp, &sess->cr_active_list, cr_list) { |
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list_del(&cr->cr_list); |
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spin_unlock(&sess->cr_a_lock); |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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list_for_each_entry_safe(cmd, cmd_tmp, |
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&cr->conn_recovery_cmd_list, i_conn_node) { |
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list_del_init(&cmd->i_conn_node); |
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cmd->conn = NULL; |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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iscsit_free_cmd(cmd, true); |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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} |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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spin_lock(&sess->cr_a_lock); |
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kfree(cr); |
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} |
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spin_unlock(&sess->cr_a_lock); |
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spin_lock(&sess->cr_i_lock); |
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list_for_each_entry_safe(cr, cr_tmp, &sess->cr_inactive_list, cr_list) { |
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list_del(&cr->cr_list); |
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spin_unlock(&sess->cr_i_lock); |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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list_for_each_entry_safe(cmd, cmd_tmp, |
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&cr->conn_recovery_cmd_list, i_conn_node) { |
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list_del_init(&cmd->i_conn_node); |
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cmd->conn = NULL; |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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iscsit_free_cmd(cmd, true); |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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} |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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spin_lock(&sess->cr_i_lock); |
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kfree(cr); |
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} |
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spin_unlock(&sess->cr_i_lock); |
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} |
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int iscsit_remove_active_connection_recovery_entry( |
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struct iscsi_conn_recovery *cr, |
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struct iscsi_session *sess) |
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{ |
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spin_lock(&sess->cr_a_lock); |
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list_del(&cr->cr_list); |
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sess->conn_recovery_count--; |
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pr_debug("Decremented connection recovery count to %u for" |
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" SID: %u\n", sess->conn_recovery_count, sess->sid); |
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spin_unlock(&sess->cr_a_lock); |
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kfree(cr); |
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return 0; |
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} |
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static void iscsit_remove_inactive_connection_recovery_entry( |
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struct iscsi_conn_recovery *cr, |
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struct iscsi_session *sess) |
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{ |
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spin_lock(&sess->cr_i_lock); |
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list_del(&cr->cr_list); |
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spin_unlock(&sess->cr_i_lock); |
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} |
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/* |
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* Called with cr->conn_recovery_cmd_lock help. |
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*/ |
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int iscsit_remove_cmd_from_connection_recovery( |
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struct iscsi_cmd *cmd, |
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struct iscsi_session *sess) |
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{ |
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struct iscsi_conn_recovery *cr; |
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if (!cmd->cr) { |
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pr_err("struct iscsi_conn_recovery pointer for ITT: 0x%08x" |
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" is NULL!\n", cmd->init_task_tag); |
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BUG(); |
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} |
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cr = cmd->cr; |
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list_del_init(&cmd->i_conn_node); |
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return --cr->cmd_count; |
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} |
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void iscsit_discard_cr_cmds_by_expstatsn( |
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struct iscsi_conn_recovery *cr, |
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u32 exp_statsn) |
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{ |
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u32 dropped_count = 0; |
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struct iscsi_cmd *cmd, *cmd_tmp; |
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struct iscsi_session *sess = cr->sess; |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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list_for_each_entry_safe(cmd, cmd_tmp, |
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&cr->conn_recovery_cmd_list, i_conn_node) { |
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if (((cmd->deferred_i_state != ISTATE_SENT_STATUS) && |
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(cmd->deferred_i_state != ISTATE_REMOVE)) || |
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(cmd->stat_sn >= exp_statsn)) { |
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continue; |
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} |
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dropped_count++; |
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pr_debug("Dropping Acknowledged ITT: 0x%08x, StatSN:" |
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" 0x%08x, CID: %hu.\n", cmd->init_task_tag, |
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cmd->stat_sn, cr->cid); |
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iscsit_remove_cmd_from_connection_recovery(cmd, sess); |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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iscsit_free_cmd(cmd, true); |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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} |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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pr_debug("Dropped %u total acknowledged commands on" |
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" CID: %hu less than old ExpStatSN: 0x%08x\n", |
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dropped_count, cr->cid, exp_statsn); |
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if (!cr->cmd_count) { |
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pr_debug("No commands to be reassigned for failed" |
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" connection CID: %hu on SID: %u\n", |
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cr->cid, sess->sid); |
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iscsit_remove_inactive_connection_recovery_entry(cr, sess); |
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iscsit_attach_active_connection_recovery_entry(sess, cr); |
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pr_debug("iSCSI connection recovery successful for CID:" |
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" %hu on SID: %u\n", cr->cid, sess->sid); |
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iscsit_remove_active_connection_recovery_entry(cr, sess); |
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} else { |
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iscsit_remove_inactive_connection_recovery_entry(cr, sess); |
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iscsit_attach_active_connection_recovery_entry(sess, cr); |
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} |
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} |
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int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn) |
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{ |
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u32 dropped_count = 0; |
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struct iscsi_cmd *cmd, *cmd_tmp; |
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struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; |
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struct iscsi_session *sess = conn->sess; |
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mutex_lock(&sess->cmdsn_mutex); |
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list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, |
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&sess->sess_ooo_cmdsn_list, ooo_list) { |
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if (ooo_cmdsn->cid != conn->cid) |
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continue; |
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dropped_count++; |
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pr_debug("Dropping unacknowledged CmdSN:" |
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" 0x%08x during connection recovery on CID: %hu\n", |
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ooo_cmdsn->cmdsn, conn->cid); |
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iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); |
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} |
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mutex_unlock(&sess->cmdsn_mutex); |
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spin_lock_bh(&conn->cmd_lock); |
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list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { |
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if (!(cmd->cmd_flags & ICF_OOO_CMDSN)) |
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continue; |
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list_del_init(&cmd->i_conn_node); |
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spin_unlock_bh(&conn->cmd_lock); |
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iscsit_free_cmd(cmd, true); |
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spin_lock_bh(&conn->cmd_lock); |
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} |
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spin_unlock_bh(&conn->cmd_lock); |
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pr_debug("Dropped %u total unacknowledged commands on CID:" |
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" %hu for ExpCmdSN: 0x%08x.\n", dropped_count, conn->cid, |
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sess->exp_cmd_sn); |
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return 0; |
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} |
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int iscsit_prepare_cmds_for_reallegiance(struct iscsi_conn *conn) |
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{ |
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u32 cmd_count = 0; |
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struct iscsi_cmd *cmd, *cmd_tmp; |
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struct iscsi_conn_recovery *cr; |
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/* |
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* Allocate an struct iscsi_conn_recovery for this connection. |
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* Each struct iscsi_cmd contains an struct iscsi_conn_recovery pointer |
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* (struct iscsi_cmd->cr) so we need to allocate this before preparing the |
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* connection's command list for connection recovery. |
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*/ |
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cr = kzalloc(sizeof(struct iscsi_conn_recovery), GFP_KERNEL); |
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if (!cr) { |
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pr_err("Unable to allocate memory for" |
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" struct iscsi_conn_recovery.\n"); |
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return -1; |
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} |
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INIT_LIST_HEAD(&cr->cr_list); |
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INIT_LIST_HEAD(&cr->conn_recovery_cmd_list); |
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spin_lock_init(&cr->conn_recovery_cmd_lock); |
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/* |
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* Only perform connection recovery on ISCSI_OP_SCSI_CMD or |
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* ISCSI_OP_NOOP_OUT opcodes. For all other opcodes call |
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* list_del_init(&cmd->i_conn_node); to release the command to the |
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* session pool and remove it from the connection's list. |
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* |
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* Also stop the DataOUT timer, which will be restarted after |
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* sending the TMR response. |
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*/ |
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spin_lock_bh(&conn->cmd_lock); |
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list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { |
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if ((cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD) && |
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(cmd->iscsi_opcode != ISCSI_OP_NOOP_OUT)) { |
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pr_debug("Not performing reallegiance on" |
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" Opcode: 0x%02x, ITT: 0x%08x, CmdSN: 0x%08x," |
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" CID: %hu\n", cmd->iscsi_opcode, |
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cmd->init_task_tag, cmd->cmd_sn, conn->cid); |
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list_del_init(&cmd->i_conn_node); |
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spin_unlock_bh(&conn->cmd_lock); |
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iscsit_free_cmd(cmd, true); |
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spin_lock_bh(&conn->cmd_lock); |
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continue; |
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} |
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/* |
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* Special case where commands greater than or equal to |
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* the session's ExpCmdSN are attached to the connection |
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* list but not to the out of order CmdSN list. The one |
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* obvious case is when a command with immediate data |
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* attached must only check the CmdSN against ExpCmdSN |
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* after the data is received. The special case below |
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* is when the connection fails before data is received, |
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* but also may apply to other PDUs, so it has been |
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* made generic here. |
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*/ |
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if (!(cmd->cmd_flags & ICF_OOO_CMDSN) && !cmd->immediate_cmd && |
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iscsi_sna_gte(cmd->cmd_sn, conn->sess->exp_cmd_sn)) { |
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list_del_init(&cmd->i_conn_node); |
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spin_unlock_bh(&conn->cmd_lock); |
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iscsit_free_cmd(cmd, true); |
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spin_lock_bh(&conn->cmd_lock); |
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continue; |
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} |
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cmd_count++; |
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pr_debug("Preparing Opcode: 0x%02x, ITT: 0x%08x," |
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" CmdSN: 0x%08x, StatSN: 0x%08x, CID: %hu for" |
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" reallegiance.\n", cmd->iscsi_opcode, |
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cmd->init_task_tag, cmd->cmd_sn, cmd->stat_sn, |
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conn->cid); |
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cmd->deferred_i_state = cmd->i_state; |
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cmd->i_state = ISTATE_IN_CONNECTION_RECOVERY; |
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if (cmd->data_direction == DMA_TO_DEVICE) |
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iscsit_stop_dataout_timer(cmd); |
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cmd->sess = conn->sess; |
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list_del_init(&cmd->i_conn_node); |
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spin_unlock_bh(&conn->cmd_lock); |
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iscsit_free_all_datain_reqs(cmd); |
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transport_wait_for_tasks(&cmd->se_cmd); |
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/* |
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* Add the struct iscsi_cmd to the connection recovery cmd list |
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*/ |
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spin_lock(&cr->conn_recovery_cmd_lock); |
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list_add_tail(&cmd->i_conn_node, &cr->conn_recovery_cmd_list); |
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spin_unlock(&cr->conn_recovery_cmd_lock); |
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spin_lock_bh(&conn->cmd_lock); |
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cmd->cr = cr; |
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cmd->conn = NULL; |
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} |
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spin_unlock_bh(&conn->cmd_lock); |
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/* |
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* Fill in the various values in the preallocated struct iscsi_conn_recovery. |
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*/ |
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cr->cid = conn->cid; |
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cr->cmd_count = cmd_count; |
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cr->maxrecvdatasegmentlength = conn->conn_ops->MaxRecvDataSegmentLength; |
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cr->maxxmitdatasegmentlength = conn->conn_ops->MaxXmitDataSegmentLength; |
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cr->sess = conn->sess; |
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iscsit_attach_inactive_connection_recovery_entry(conn->sess, cr); |
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return 0; |
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} |
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int iscsit_connection_recovery_transport_reset(struct iscsi_conn *conn) |
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{ |
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atomic_set(&conn->connection_recovery, 1); |
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if (iscsit_close_connection(conn) < 0) |
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return -1; |
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return 0; |
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}
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