LXR linux/drivers/target/iscsi/iscsi_target

   1/*******************************************************************************
   2 * This file contains the iSCSI Virtual Device and Disk Transport
   3 * agnostic related functions.
   4 *
   5 \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   6 *
   7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   8 *
   9 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 ******************************************************************************/
  21
  22#include <scsi/scsi_device.h>
  23#include <target/target_core_base.h>
  24#include <target/target_core_fabric.h>
  25
  26#include "iscsi_target_core.h"
  27#include "iscsi_target_device.h"
  28#include "iscsi_target_tpg.h"
  29#include "iscsi_target_util.h"
  30
  31int iscsit_get_lun_for_tmr(
  32        struct iscsi_cmd *cmd,
  33        u64 lun)
  34{
  35        u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
  36
  37        return transport_lookup_tmr_lun(&cmd->se_cmd, unpacked_lun);
  38}
  39
  40int iscsit_get_lun_for_cmd(
  41        struct iscsi_cmd *cmd,
  42        unsigned char *cdb,
  43        u64 lun)
  44{
  45        u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
  46
  47        return transport_lookup_cmd_lun(&cmd->se_cmd, unpacked_lun);
  48}
  49
  50void iscsit_determine_maxcmdsn(struct iscsi_session *sess)
  51{
  52        struct se_node_acl *se_nacl;
  53
  54        /*
  55         * This is a discovery session, the single queue slot was already
  56         * assigned in iscsi_login_zero_tsih().  Since only Logout and
  57         * Text Opcodes are allowed during discovery we do not have to worry
  58         * about the HBA's queue depth here.
  59         */
  60        if (sess->sess_ops->SessionType)
  61                return;
  62
  63        se_nacl = sess->se_sess->se_node_acl;
  64
  65        /*
  66         * This is a normal session, set the Session's CmdSN window to the
  67         * struct se_node_acl->queue_depth.  The value in struct se_node_acl->queue_depth
  68         * has already been validated as a legal value in
  69         * core_set_queue_depth_for_node().
  70         */
  71        sess->cmdsn_window = se_nacl->queue_depth;
  72        sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1;
  73}
  74
  75void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess)
  76{
  77        if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
  78                return;
  79
  80        cmd->maxcmdsn_inc = 1;
  81
  82        mutex_lock(&sess->cmdsn_mutex);
  83        sess->max_cmd_sn += 1;
  84        pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
  85        mutex_unlock(&sess->cmdsn_mutex);
  86}
  87