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59e4f541ba
The error paths in target_emulate_set_target_port_groups() are all
essentially "rc = -EINVAL; goto out;" but the code at "out:" ignores
rc and always returns success. This means that even if eg explicit
ALUA is turned off, the initiator will always see a good SCSI status
for SET TARGET PORT GROUPS.
Fix this by returning rc as is intended. It appears this bug was
added by the following patch:
commit 05d1c7c0d0
Author: Andy Grover <agrover@redhat.com>
Date: Wed Jul 20 19:13:28 2011 +0000
target: Make all control CDBs scatter-gather
Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2103 lines
57 KiB
C
2103 lines
57 KiB
C
/*******************************************************************************
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* Filename: target_core_alua.c
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*
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* This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
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*
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* Copyright (c) 2009-2010 Rising Tide Systems
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* Copyright (c) 2009-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/configfs.h>
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#include <linux/export.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_fabric.h>
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#include <target/target_core_configfs.h>
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#include "target_core_internal.h"
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#include "target_core_alua.h"
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#include "target_core_ua.h"
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static int core_alua_check_transition(int state, int *primary);
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static int core_alua_set_tg_pt_secondary_state(
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struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
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struct se_port *port, int explict, int offline);
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static u16 alua_lu_gps_counter;
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static u32 alua_lu_gps_count;
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static DEFINE_SPINLOCK(lu_gps_lock);
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static LIST_HEAD(lu_gps_list);
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struct t10_alua_lu_gp *default_lu_gp;
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/*
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* REPORT_TARGET_PORT_GROUPS
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*
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* See spc4r17 section 6.27
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*/
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int target_emulate_report_target_port_groups(struct se_cmd *cmd)
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{
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struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
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struct se_port *port;
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struct t10_alua_tg_pt_gp *tg_pt_gp;
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struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
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unsigned char *buf;
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u32 rd_len = 0, off;
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int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
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/*
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* Skip over RESERVED area to first Target port group descriptor
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* depending on the PARAMETER DATA FORMAT type..
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*/
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if (ext_hdr != 0)
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off = 8;
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else
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off = 4;
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if (cmd->data_length < off) {
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pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
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" small for %s header\n", cmd->data_length,
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(ext_hdr) ? "extended" : "normal");
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cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
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return -EINVAL;
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}
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buf = transport_kmap_data_sg(cmd);
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spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
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list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
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tg_pt_gp_list) {
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/*
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* Check if the Target port group and Target port descriptor list
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* based on tg_pt_gp_members count will fit into the response payload.
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* Otherwise, bump rd_len to let the initiator know we have exceeded
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* the allocation length and the response is truncated.
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*/
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if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
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cmd->data_length) {
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rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
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continue;
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}
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/*
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* PREF: Preferred target port bit, determine if this
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* bit should be set for port group.
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*/
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if (tg_pt_gp->tg_pt_gp_pref)
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buf[off] = 0x80;
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/*
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* Set the ASYMMETRIC ACCESS State
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*/
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buf[off++] |= (atomic_read(
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&tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
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/*
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* Set supported ASYMMETRIC ACCESS State bits
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*/
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buf[off] = 0x80; /* T_SUP */
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buf[off] |= 0x40; /* O_SUP */
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buf[off] |= 0x8; /* U_SUP */
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buf[off] |= 0x4; /* S_SUP */
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buf[off] |= 0x2; /* AN_SUP */
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buf[off++] |= 0x1; /* AO_SUP */
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/*
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* TARGET PORT GROUP
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*/
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buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
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buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
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off++; /* Skip over Reserved */
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/*
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* STATUS CODE
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*/
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buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
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/*
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* Vendor Specific field
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*/
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buf[off++] = 0x00;
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/*
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* TARGET PORT COUNT
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*/
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buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
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rd_len += 8;
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spin_lock(&tg_pt_gp->tg_pt_gp_lock);
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list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
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tg_pt_gp_mem_list) {
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port = tg_pt_gp_mem->tg_pt;
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/*
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* Start Target Port descriptor format
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*
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* See spc4r17 section 6.2.7 Table 247
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*/
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off += 2; /* Skip over Obsolete */
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/*
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* Set RELATIVE TARGET PORT IDENTIFIER
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*/
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buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
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buf[off++] = (port->sep_rtpi & 0xff);
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rd_len += 4;
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}
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spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
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}
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spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
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/*
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* Set the RETURN DATA LENGTH set in the header of the DataIN Payload
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*/
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put_unaligned_be32(rd_len, &buf[0]);
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/*
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* Fill in the Extended header parameter data format if requested
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*/
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if (ext_hdr != 0) {
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buf[4] = 0x10;
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/*
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* Set the implict transition time (in seconds) for the application
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* client to use as a base for it's transition timeout value.
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*
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* Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
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* this CDB was received upon to determine this value individually
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* for ALUA target port group.
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*/
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port = cmd->se_lun->lun_sep;
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tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
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if (tg_pt_gp_mem) {
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spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
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tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
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if (tg_pt_gp)
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buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs;
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spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
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}
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}
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transport_kunmap_data_sg(cmd);
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target_complete_cmd(cmd, GOOD);
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return 0;
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}
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/*
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* SET_TARGET_PORT_GROUPS for explict ALUA operation.
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*
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* See spc4r17 section 6.35
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*/
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int target_emulate_set_target_port_groups(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct se_subsystem_dev *su_dev = dev->se_sub_dev;
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struct se_port *port, *l_port = cmd->se_lun->lun_sep;
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struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
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struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
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struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
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unsigned char *buf;
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unsigned char *ptr;
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u32 len = 4; /* Skip over RESERVED area in header */
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int alua_access_state, primary = 0, rc;
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u16 tg_pt_id, rtpi;
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if (!l_port) {
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cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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return -EINVAL;
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}
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buf = transport_kmap_data_sg(cmd);
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/*
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* Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
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* for the local tg_pt_gp.
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*/
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l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
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if (!l_tg_pt_gp_mem) {
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pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
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cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
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rc = -EINVAL;
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goto out;
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}
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spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
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l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
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if (!l_tg_pt_gp) {
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spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
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pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
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cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
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rc = -EINVAL;
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goto out;
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}
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rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA);
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spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
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if (!rc) {
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pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
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" while TPGS_EXPLICT_ALUA is disabled\n");
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cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
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rc = -EINVAL;
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goto out;
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}
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ptr = &buf[4]; /* Skip over RESERVED area in header */
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while (len < cmd->data_length) {
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alua_access_state = (ptr[0] & 0x0f);
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/*
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* Check the received ALUA access state, and determine if
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* the state is a primary or secondary target port asymmetric
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* access state.
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*/
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rc = core_alua_check_transition(alua_access_state, &primary);
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if (rc != 0) {
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/*
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* If the SET TARGET PORT GROUPS attempts to establish
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* an invalid combination of target port asymmetric
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* access states or attempts to establish an
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* unsupported target port asymmetric access state,
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* then the command shall be terminated with CHECK
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* CONDITION status, with the sense key set to ILLEGAL
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* REQUEST, and the additional sense code set to INVALID
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* FIELD IN PARAMETER LIST.
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*/
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cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
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rc = -EINVAL;
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goto out;
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}
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rc = -1;
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/*
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* If the ASYMMETRIC ACCESS STATE field (see table 267)
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* specifies a primary target port asymmetric access state,
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* then the TARGET PORT GROUP OR TARGET PORT field specifies
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* a primary target port group for which the primary target
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* port asymmetric access state shall be changed. If the
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* ASYMMETRIC ACCESS STATE field specifies a secondary target
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* port asymmetric access state, then the TARGET PORT GROUP OR
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* TARGET PORT field specifies the relative target port
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* identifier (see 3.1.120) of the target port for which the
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* secondary target port asymmetric access state shall be
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* changed.
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*/
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if (primary) {
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tg_pt_id = get_unaligned_be16(ptr + 2);
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/*
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* Locate the matching target port group ID from
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* the global tg_pt_gp list
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*/
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spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
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list_for_each_entry(tg_pt_gp,
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&su_dev->t10_alua.tg_pt_gps_list,
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tg_pt_gp_list) {
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if (!tg_pt_gp->tg_pt_gp_valid_id)
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continue;
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if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
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continue;
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atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
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smp_mb__after_atomic_inc();
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spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
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rc = core_alua_do_port_transition(tg_pt_gp,
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dev, l_port, nacl,
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alua_access_state, 1);
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spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
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atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
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smp_mb__after_atomic_dec();
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break;
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}
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spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
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/*
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* If not matching target port group ID can be located
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* throw an exception with ASCQ: INVALID_PARAMETER_LIST
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*/
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if (rc != 0) {
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cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
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rc = -EINVAL;
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goto out;
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}
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} else {
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/*
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* Extact the RELATIVE TARGET PORT IDENTIFIER to identify
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* the Target Port in question for the the incoming
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* SET_TARGET_PORT_GROUPS op.
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*/
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rtpi = get_unaligned_be16(ptr + 2);
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/*
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* Locate the matching relative target port identifer
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* for the struct se_device storage object.
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*/
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spin_lock(&dev->se_port_lock);
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list_for_each_entry(port, &dev->dev_sep_list,
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sep_list) {
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if (port->sep_rtpi != rtpi)
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continue;
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tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
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spin_unlock(&dev->se_port_lock);
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rc = core_alua_set_tg_pt_secondary_state(
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tg_pt_gp_mem, port, 1, 1);
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spin_lock(&dev->se_port_lock);
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break;
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}
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spin_unlock(&dev->se_port_lock);
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/*
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* If not matching relative target port identifier can
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* be located, throw an exception with ASCQ:
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* INVALID_PARAMETER_LIST
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*/
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if (rc != 0) {
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cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
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rc = -EINVAL;
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goto out;
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}
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}
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ptr += 4;
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len += 4;
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}
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out:
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transport_kunmap_data_sg(cmd);
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if (!rc)
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target_complete_cmd(cmd, GOOD);
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return rc;
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}
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|
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static inline int core_alua_state_nonoptimized(
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struct se_cmd *cmd,
|
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unsigned char *cdb,
|
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int nonop_delay_msecs,
|
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u8 *alua_ascq)
|
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{
|
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/*
|
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* Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
|
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* later to determine if processing of this cmd needs to be
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* temporarily delayed for the Active/NonOptimized primary access state.
|
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*/
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cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
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cmd->alua_nonop_delay = nonop_delay_msecs;
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return 0;
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}
|
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|
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static inline int core_alua_state_standby(
|
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struct se_cmd *cmd,
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unsigned char *cdb,
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u8 *alua_ascq)
|
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{
|
|
/*
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|
* Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
|
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* spc4r17 section 5.9.2.4.4
|
|
*/
|
|
switch (cdb[0]) {
|
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case INQUIRY:
|
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case LOG_SELECT:
|
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case LOG_SENSE:
|
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case MODE_SELECT:
|
|
case MODE_SENSE:
|
|
case REPORT_LUNS:
|
|
case RECEIVE_DIAGNOSTIC:
|
|
case SEND_DIAGNOSTIC:
|
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case MAINTENANCE_IN:
|
|
switch (cdb[1] & 0x1f) {
|
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case MI_REPORT_TARGET_PGS:
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return 0;
|
|
default:
|
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*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
|
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return 1;
|
|
}
|
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case MAINTENANCE_OUT:
|
|
switch (cdb[1]) {
|
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case MO_SET_TARGET_PGS:
|
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return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
|
|
return 1;
|
|
}
|
|
case REQUEST_SENSE:
|
|
case PERSISTENT_RESERVE_IN:
|
|
case PERSISTENT_RESERVE_OUT:
|
|
case READ_BUFFER:
|
|
case WRITE_BUFFER:
|
|
return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int core_alua_state_unavailable(
|
|
struct se_cmd *cmd,
|
|
unsigned char *cdb,
|
|
u8 *alua_ascq)
|
|
{
|
|
/*
|
|
* Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
|
|
* spc4r17 section 5.9.2.4.5
|
|
*/
|
|
switch (cdb[0]) {
|
|
case INQUIRY:
|
|
case REPORT_LUNS:
|
|
case MAINTENANCE_IN:
|
|
switch (cdb[1] & 0x1f) {
|
|
case MI_REPORT_TARGET_PGS:
|
|
return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
|
|
return 1;
|
|
}
|
|
case MAINTENANCE_OUT:
|
|
switch (cdb[1]) {
|
|
case MO_SET_TARGET_PGS:
|
|
return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
|
|
return 1;
|
|
}
|
|
case REQUEST_SENSE:
|
|
case READ_BUFFER:
|
|
case WRITE_BUFFER:
|
|
return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int core_alua_state_transition(
|
|
struct se_cmd *cmd,
|
|
unsigned char *cdb,
|
|
u8 *alua_ascq)
|
|
{
|
|
/*
|
|
* Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
|
|
* spc4r17 section 5.9.2.5
|
|
*/
|
|
switch (cdb[0]) {
|
|
case INQUIRY:
|
|
case REPORT_LUNS:
|
|
case MAINTENANCE_IN:
|
|
switch (cdb[1] & 0x1f) {
|
|
case MI_REPORT_TARGET_PGS:
|
|
return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
|
|
return 1;
|
|
}
|
|
case REQUEST_SENSE:
|
|
case READ_BUFFER:
|
|
case WRITE_BUFFER:
|
|
return 0;
|
|
default:
|
|
*alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
|
|
* in transport_cmd_sequencer(). This function is assigned to
|
|
* struct t10_alua *->state_check() in core_setup_alua()
|
|
*/
|
|
static int core_alua_state_check_nop(
|
|
struct se_cmd *cmd,
|
|
unsigned char *cdb,
|
|
u8 *alua_ascq)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
|
|
* This function is assigned to struct t10_alua *->state_check() in
|
|
* core_setup_alua()
|
|
*
|
|
* Also, this function can return three different return codes to
|
|
* signal transport_generic_cmd_sequencer()
|
|
*
|
|
* return 1: Is used to signal LUN not accecsable, and check condition/not ready
|
|
* return 0: Used to signal success
|
|
* reutrn -1: Used to signal failure, and invalid cdb field
|
|
*/
|
|
static int core_alua_state_check(
|
|
struct se_cmd *cmd,
|
|
unsigned char *cdb,
|
|
u8 *alua_ascq)
|
|
{
|
|
struct se_lun *lun = cmd->se_lun;
|
|
struct se_port *port = lun->lun_sep;
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
|
|
int out_alua_state, nonop_delay_msecs;
|
|
|
|
if (!port)
|
|
return 0;
|
|
/*
|
|
* First, check for a struct se_port specific secondary ALUA target port
|
|
* access state: OFFLINE
|
|
*/
|
|
if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
|
|
*alua_ascq = ASCQ_04H_ALUA_OFFLINE;
|
|
pr_debug("ALUA: Got secondary offline status for local"
|
|
" target port\n");
|
|
*alua_ascq = ASCQ_04H_ALUA_OFFLINE;
|
|
return 1;
|
|
}
|
|
/*
|
|
* Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
|
|
* ALUA target port group, to obtain current ALUA access state.
|
|
* Otherwise look for the underlying struct se_device association with
|
|
* a ALUA logical unit group.
|
|
*/
|
|
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
|
|
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
|
|
out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
|
|
nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
/*
|
|
* Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
|
|
* statement so the compiler knows explicitly to check this case first.
|
|
* For the Optimized ALUA access state case, we want to process the
|
|
* incoming fabric cmd ASAP..
|
|
*/
|
|
if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
|
|
return 0;
|
|
|
|
switch (out_alua_state) {
|
|
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
|
|
return core_alua_state_nonoptimized(cmd, cdb,
|
|
nonop_delay_msecs, alua_ascq);
|
|
case ALUA_ACCESS_STATE_STANDBY:
|
|
return core_alua_state_standby(cmd, cdb, alua_ascq);
|
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
|
return core_alua_state_unavailable(cmd, cdb, alua_ascq);
|
|
case ALUA_ACCESS_STATE_TRANSITION:
|
|
return core_alua_state_transition(cmd, cdb, alua_ascq);
|
|
/*
|
|
* OFFLINE is a secondary ALUA target port group access state, that is
|
|
* handled above with struct se_port->sep_tg_pt_secondary_offline=1
|
|
*/
|
|
case ALUA_ACCESS_STATE_OFFLINE:
|
|
default:
|
|
pr_err("Unknown ALUA access state: 0x%02x\n",
|
|
out_alua_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check implict and explict ALUA state change request.
|
|
*/
|
|
static int core_alua_check_transition(int state, int *primary)
|
|
{
|
|
switch (state) {
|
|
case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
|
|
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
|
|
case ALUA_ACCESS_STATE_STANDBY:
|
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
|
/*
|
|
* OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
|
|
* defined as primary target port asymmetric access states.
|
|
*/
|
|
*primary = 1;
|
|
break;
|
|
case ALUA_ACCESS_STATE_OFFLINE:
|
|
/*
|
|
* OFFLINE state is defined as a secondary target port
|
|
* asymmetric access state.
|
|
*/
|
|
*primary = 0;
|
|
break;
|
|
default:
|
|
pr_err("Unknown ALUA access state: 0x%02x\n", state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *core_alua_dump_state(int state)
|
|
{
|
|
switch (state) {
|
|
case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
|
|
return "Active/Optimized";
|
|
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
|
|
return "Active/NonOptimized";
|
|
case ALUA_ACCESS_STATE_STANDBY:
|
|
return "Standby";
|
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
|
return "Unavailable";
|
|
case ALUA_ACCESS_STATE_OFFLINE:
|
|
return "Offline";
|
|
default:
|
|
return "Unknown";
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
char *core_alua_dump_status(int status)
|
|
{
|
|
switch (status) {
|
|
case ALUA_STATUS_NONE:
|
|
return "None";
|
|
case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
|
|
return "Altered by Explict STPG";
|
|
case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
|
|
return "Altered by Implict ALUA";
|
|
default:
|
|
return "Unknown";
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Used by fabric modules to determine when we need to delay processing
|
|
* for the Active/NonOptimized paths..
|
|
*/
|
|
int core_alua_check_nonop_delay(
|
|
struct se_cmd *cmd)
|
|
{
|
|
if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
|
|
return 0;
|
|
if (in_interrupt())
|
|
return 0;
|
|
/*
|
|
* The ALUA Active/NonOptimized access state delay can be disabled
|
|
* in via configfs with a value of zero
|
|
*/
|
|
if (!cmd->alua_nonop_delay)
|
|
return 0;
|
|
/*
|
|
* struct se_cmd->alua_nonop_delay gets set by a target port group
|
|
* defined interval in core_alua_state_nonoptimized()
|
|
*/
|
|
msleep_interruptible(cmd->alua_nonop_delay);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(core_alua_check_nonop_delay);
|
|
|
|
/*
|
|
* Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
|
|
*
|
|
*/
|
|
static int core_alua_write_tpg_metadata(
|
|
const char *path,
|
|
unsigned char *md_buf,
|
|
u32 md_buf_len)
|
|
{
|
|
mm_segment_t old_fs;
|
|
struct file *file;
|
|
struct iovec iov[1];
|
|
int flags = O_RDWR | O_CREAT | O_TRUNC, ret;
|
|
|
|
memset(iov, 0, sizeof(struct iovec));
|
|
|
|
file = filp_open(path, flags, 0600);
|
|
if (IS_ERR(file) || !file || !file->f_dentry) {
|
|
pr_err("filp_open(%s) for ALUA metadata failed\n",
|
|
path);
|
|
return -ENODEV;
|
|
}
|
|
|
|
iov[0].iov_base = &md_buf[0];
|
|
iov[0].iov_len = md_buf_len;
|
|
|
|
old_fs = get_fs();
|
|
set_fs(get_ds());
|
|
ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
|
|
set_fs(old_fs);
|
|
|
|
if (ret < 0) {
|
|
pr_err("Error writing ALUA metadata file: %s\n", path);
|
|
filp_close(file, NULL);
|
|
return -EIO;
|
|
}
|
|
filp_close(file, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called with tg_pt_gp->tg_pt_gp_md_mutex held
|
|
*/
|
|
static int core_alua_update_tpg_primary_metadata(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
int primary_state,
|
|
unsigned char *md_buf)
|
|
{
|
|
struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
|
|
struct t10_wwn *wwn = &su_dev->t10_wwn;
|
|
char path[ALUA_METADATA_PATH_LEN];
|
|
int len;
|
|
|
|
memset(path, 0, ALUA_METADATA_PATH_LEN);
|
|
|
|
len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
|
|
"tg_pt_gp_id=%hu\n"
|
|
"alua_access_state=0x%02x\n"
|
|
"alua_access_status=0x%02x\n",
|
|
tg_pt_gp->tg_pt_gp_id, primary_state,
|
|
tg_pt_gp->tg_pt_gp_alua_access_status);
|
|
|
|
snprintf(path, ALUA_METADATA_PATH_LEN,
|
|
"/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
|
|
config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
|
|
|
|
return core_alua_write_tpg_metadata(path, md_buf, len);
|
|
}
|
|
|
|
static int core_alua_do_transition_tg_pt(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
struct se_port *l_port,
|
|
struct se_node_acl *nacl,
|
|
unsigned char *md_buf,
|
|
int new_state,
|
|
int explict)
|
|
{
|
|
struct se_dev_entry *se_deve;
|
|
struct se_lun_acl *lacl;
|
|
struct se_port *port;
|
|
struct t10_alua_tg_pt_gp_member *mem;
|
|
int old_state = 0;
|
|
/*
|
|
* Save the old primary ALUA access state, and set the current state
|
|
* to ALUA_ACCESS_STATE_TRANSITION.
|
|
*/
|
|
old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
|
|
atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
|
|
ALUA_ACCESS_STATE_TRANSITION);
|
|
tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
|
|
ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
|
|
ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
|
|
/*
|
|
* Check for the optional ALUA primary state transition delay
|
|
*/
|
|
if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
|
|
msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
|
|
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
|
|
tg_pt_gp_mem_list) {
|
|
port = mem->tg_pt;
|
|
/*
|
|
* After an implicit target port asymmetric access state
|
|
* change, a device server shall establish a unit attention
|
|
* condition for the initiator port associated with every I_T
|
|
* nexus with the additional sense code set to ASYMMETRIC
|
|
* ACCESS STATE CHAGED.
|
|
*
|
|
* After an explicit target port asymmetric access state
|
|
* change, a device server shall establish a unit attention
|
|
* condition with the additional sense code set to ASYMMETRIC
|
|
* ACCESS STATE CHANGED for the initiator port associated with
|
|
* every I_T nexus other than the I_T nexus on which the SET
|
|
* TARGET PORT GROUPS command
|
|
*/
|
|
atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
|
|
smp_mb__after_atomic_inc();
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
|
|
spin_lock_bh(&port->sep_alua_lock);
|
|
list_for_each_entry(se_deve, &port->sep_alua_list,
|
|
alua_port_list) {
|
|
lacl = se_deve->se_lun_acl;
|
|
/*
|
|
* se_deve->se_lun_acl pointer may be NULL for a
|
|
* entry created without explict Node+MappedLUN ACLs
|
|
*/
|
|
if (!lacl)
|
|
continue;
|
|
|
|
if (explict &&
|
|
(nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
|
|
(l_port != NULL) && (l_port == port))
|
|
continue;
|
|
|
|
core_scsi3_ua_allocate(lacl->se_lun_nacl,
|
|
se_deve->mapped_lun, 0x2A,
|
|
ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
|
|
}
|
|
spin_unlock_bh(&port->sep_alua_lock);
|
|
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
|
|
smp_mb__after_atomic_dec();
|
|
}
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
/*
|
|
* Update the ALUA metadata buf that has been allocated in
|
|
* core_alua_do_port_transition(), this metadata will be written
|
|
* to struct file.
|
|
*
|
|
* Note that there is the case where we do not want to update the
|
|
* metadata when the saved metadata is being parsed in userspace
|
|
* when setting the existing port access state and access status.
|
|
*
|
|
* Also note that the failure to write out the ALUA metadata to
|
|
* struct file does NOT affect the actual ALUA transition.
|
|
*/
|
|
if (tg_pt_gp->tg_pt_gp_write_metadata) {
|
|
mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
|
|
core_alua_update_tpg_primary_metadata(tg_pt_gp,
|
|
new_state, md_buf);
|
|
mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
|
|
}
|
|
/*
|
|
* Set the current primary ALUA access state to the requested new state
|
|
*/
|
|
atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
|
|
|
|
pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
|
|
" from primary access state %s to %s\n", (explict) ? "explict" :
|
|
"implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
|
|
tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
|
|
core_alua_dump_state(new_state));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int core_alua_do_port_transition(
|
|
struct t10_alua_tg_pt_gp *l_tg_pt_gp,
|
|
struct se_device *l_dev,
|
|
struct se_port *l_port,
|
|
struct se_node_acl *l_nacl,
|
|
int new_state,
|
|
int explict)
|
|
{
|
|
struct se_device *dev;
|
|
struct se_port *port;
|
|
struct se_subsystem_dev *su_dev;
|
|
struct se_node_acl *nacl;
|
|
struct t10_alua_lu_gp *lu_gp;
|
|
struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
unsigned char *md_buf;
|
|
int primary;
|
|
|
|
if (core_alua_check_transition(new_state, &primary) != 0)
|
|
return -EINVAL;
|
|
|
|
md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
|
|
if (!md_buf) {
|
|
pr_err("Unable to allocate buf for ALUA metadata\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
|
|
spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
|
|
lu_gp = local_lu_gp_mem->lu_gp;
|
|
atomic_inc(&lu_gp->lu_gp_ref_cnt);
|
|
smp_mb__after_atomic_inc();
|
|
spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
|
|
/*
|
|
* For storage objects that are members of the 'default_lu_gp',
|
|
* we only do transition on the passed *l_tp_pt_gp, and not
|
|
* on all of the matching target port groups IDs in default_lu_gp.
|
|
*/
|
|
if (!lu_gp->lu_gp_id) {
|
|
/*
|
|
* core_alua_do_transition_tg_pt() will always return
|
|
* success.
|
|
*/
|
|
core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
|
|
md_buf, new_state, explict);
|
|
atomic_dec(&lu_gp->lu_gp_ref_cnt);
|
|
smp_mb__after_atomic_dec();
|
|
kfree(md_buf);
|
|
return 0;
|
|
}
|
|
/*
|
|
* For all other LU groups aside from 'default_lu_gp', walk all of
|
|
* the associated storage objects looking for a matching target port
|
|
* group ID from the local target port group.
|
|
*/
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
|
|
lu_gp_mem_list) {
|
|
|
|
dev = lu_gp_mem->lu_gp_mem_dev;
|
|
su_dev = dev->se_sub_dev;
|
|
atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
|
|
smp_mb__after_atomic_inc();
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
list_for_each_entry(tg_pt_gp,
|
|
&su_dev->t10_alua.tg_pt_gps_list,
|
|
tg_pt_gp_list) {
|
|
|
|
if (!tg_pt_gp->tg_pt_gp_valid_id)
|
|
continue;
|
|
/*
|
|
* If the target behavior port asymmetric access state
|
|
* is changed for any target port group accessiable via
|
|
* a logical unit within a LU group, the target port
|
|
* behavior group asymmetric access states for the same
|
|
* target port group accessible via other logical units
|
|
* in that LU group will also change.
|
|
*/
|
|
if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
|
|
continue;
|
|
|
|
if (l_tg_pt_gp == tg_pt_gp) {
|
|
port = l_port;
|
|
nacl = l_nacl;
|
|
} else {
|
|
port = NULL;
|
|
nacl = NULL;
|
|
}
|
|
atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
|
smp_mb__after_atomic_inc();
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
/*
|
|
* core_alua_do_transition_tg_pt() will always return
|
|
* success.
|
|
*/
|
|
core_alua_do_transition_tg_pt(tg_pt_gp, port,
|
|
nacl, md_buf, new_state, explict);
|
|
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
|
smp_mb__after_atomic_dec();
|
|
}
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
|
|
smp_mb__after_atomic_dec();
|
|
}
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
|
|
pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
|
|
" Group IDs: %hu %s transition to primary state: %s\n",
|
|
config_item_name(&lu_gp->lu_gp_group.cg_item),
|
|
l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
|
|
core_alua_dump_state(new_state));
|
|
|
|
atomic_dec(&lu_gp->lu_gp_ref_cnt);
|
|
smp_mb__after_atomic_dec();
|
|
kfree(md_buf);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
|
|
*/
|
|
static int core_alua_update_tpg_secondary_metadata(
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
|
|
struct se_port *port,
|
|
unsigned char *md_buf,
|
|
u32 md_buf_len)
|
|
{
|
|
struct se_portal_group *se_tpg = port->sep_tpg;
|
|
char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
|
|
int len;
|
|
|
|
memset(path, 0, ALUA_METADATA_PATH_LEN);
|
|
memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
|
|
|
|
len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
|
|
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
|
|
|
|
if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
|
|
snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
|
|
se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
|
|
|
|
len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
|
|
"alua_tg_pt_status=0x%02x\n",
|
|
atomic_read(&port->sep_tg_pt_secondary_offline),
|
|
port->sep_tg_pt_secondary_stat);
|
|
|
|
snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
|
|
se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
|
|
port->sep_lun->unpacked_lun);
|
|
|
|
return core_alua_write_tpg_metadata(path, md_buf, len);
|
|
}
|
|
|
|
static int core_alua_set_tg_pt_secondary_state(
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
|
|
struct se_port *port,
|
|
int explict,
|
|
int offline)
|
|
{
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
unsigned char *md_buf;
|
|
u32 md_buf_len;
|
|
int trans_delay_msecs;
|
|
|
|
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
|
|
if (!tg_pt_gp) {
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
pr_err("Unable to complete secondary state"
|
|
" transition\n");
|
|
return -EINVAL;
|
|
}
|
|
trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
|
|
/*
|
|
* Set the secondary ALUA target port access state to OFFLINE
|
|
* or release the previously secondary state for struct se_port
|
|
*/
|
|
if (offline)
|
|
atomic_set(&port->sep_tg_pt_secondary_offline, 1);
|
|
else
|
|
atomic_set(&port->sep_tg_pt_secondary_offline, 0);
|
|
|
|
md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
|
|
port->sep_tg_pt_secondary_stat = (explict) ?
|
|
ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
|
|
ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
|
|
|
|
pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
|
|
" to secondary access state: %s\n", (explict) ? "explict" :
|
|
"implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
|
|
tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
|
|
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
/*
|
|
* Do the optional transition delay after we set the secondary
|
|
* ALUA access state.
|
|
*/
|
|
if (trans_delay_msecs != 0)
|
|
msleep_interruptible(trans_delay_msecs);
|
|
/*
|
|
* See if we need to update the ALUA fabric port metadata for
|
|
* secondary state and status
|
|
*/
|
|
if (port->sep_tg_pt_secondary_write_md) {
|
|
md_buf = kzalloc(md_buf_len, GFP_KERNEL);
|
|
if (!md_buf) {
|
|
pr_err("Unable to allocate md_buf for"
|
|
" secondary ALUA access metadata\n");
|
|
return -ENOMEM;
|
|
}
|
|
mutex_lock(&port->sep_tg_pt_md_mutex);
|
|
core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
|
|
md_buf, md_buf_len);
|
|
mutex_unlock(&port->sep_tg_pt_md_mutex);
|
|
|
|
kfree(md_buf);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct t10_alua_lu_gp *
|
|
core_alua_allocate_lu_gp(const char *name, int def_group)
|
|
{
|
|
struct t10_alua_lu_gp *lu_gp;
|
|
|
|
lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
|
|
if (!lu_gp) {
|
|
pr_err("Unable to allocate struct t10_alua_lu_gp\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
INIT_LIST_HEAD(&lu_gp->lu_gp_node);
|
|
INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
|
|
spin_lock_init(&lu_gp->lu_gp_lock);
|
|
atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
|
|
|
|
if (def_group) {
|
|
lu_gp->lu_gp_id = alua_lu_gps_counter++;
|
|
lu_gp->lu_gp_valid_id = 1;
|
|
alua_lu_gps_count++;
|
|
}
|
|
|
|
return lu_gp;
|
|
}
|
|
|
|
int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
|
|
{
|
|
struct t10_alua_lu_gp *lu_gp_tmp;
|
|
u16 lu_gp_id_tmp;
|
|
/*
|
|
* The lu_gp->lu_gp_id may only be set once..
|
|
*/
|
|
if (lu_gp->lu_gp_valid_id) {
|
|
pr_warn("ALUA LU Group already has a valid ID,"
|
|
" ignoring request\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock(&lu_gps_lock);
|
|
if (alua_lu_gps_count == 0x0000ffff) {
|
|
pr_err("Maximum ALUA alua_lu_gps_count:"
|
|
" 0x0000ffff reached\n");
|
|
spin_unlock(&lu_gps_lock);
|
|
kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
|
|
return -ENOSPC;
|
|
}
|
|
again:
|
|
lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
|
|
alua_lu_gps_counter++;
|
|
|
|
list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
|
|
if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
|
|
if (!lu_gp_id)
|
|
goto again;
|
|
|
|
pr_warn("ALUA Logical Unit Group ID: %hu"
|
|
" already exists, ignoring request\n",
|
|
lu_gp_id);
|
|
spin_unlock(&lu_gps_lock);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
lu_gp->lu_gp_id = lu_gp_id_tmp;
|
|
lu_gp->lu_gp_valid_id = 1;
|
|
list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
|
|
alua_lu_gps_count++;
|
|
spin_unlock(&lu_gps_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct t10_alua_lu_gp_member *
|
|
core_alua_allocate_lu_gp_mem(struct se_device *dev)
|
|
{
|
|
struct t10_alua_lu_gp_member *lu_gp_mem;
|
|
|
|
lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
|
|
if (!lu_gp_mem) {
|
|
pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
|
|
spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
|
|
atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
|
|
|
|
lu_gp_mem->lu_gp_mem_dev = dev;
|
|
dev->dev_alua_lu_gp_mem = lu_gp_mem;
|
|
|
|
return lu_gp_mem;
|
|
}
|
|
|
|
void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
|
|
{
|
|
struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
|
|
/*
|
|
* Once we have reached this point, config_item_put() has
|
|
* already been called from target_core_alua_drop_lu_gp().
|
|
*
|
|
* Here, we remove the *lu_gp from the global list so that
|
|
* no associations can be made while we are releasing
|
|
* struct t10_alua_lu_gp.
|
|
*/
|
|
spin_lock(&lu_gps_lock);
|
|
list_del(&lu_gp->lu_gp_node);
|
|
alua_lu_gps_count--;
|
|
spin_unlock(&lu_gps_lock);
|
|
/*
|
|
* Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
|
|
* in target_core_configfs.c:target_core_store_alua_lu_gp() to be
|
|
* released with core_alua_put_lu_gp_from_name()
|
|
*/
|
|
while (atomic_read(&lu_gp->lu_gp_ref_cnt))
|
|
cpu_relax();
|
|
/*
|
|
* Release reference to struct t10_alua_lu_gp * from all associated
|
|
* struct se_device.
|
|
*/
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
|
|
&lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
|
|
if (lu_gp_mem->lu_gp_assoc) {
|
|
list_del(&lu_gp_mem->lu_gp_mem_list);
|
|
lu_gp->lu_gp_members--;
|
|
lu_gp_mem->lu_gp_assoc = 0;
|
|
}
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
/*
|
|
*
|
|
* lu_gp_mem is associated with a single
|
|
* struct se_device->dev_alua_lu_gp_mem, and is released when
|
|
* struct se_device is released via core_alua_free_lu_gp_mem().
|
|
*
|
|
* If the passed lu_gp does NOT match the default_lu_gp, assume
|
|
* we want to re-assocate a given lu_gp_mem with default_lu_gp.
|
|
*/
|
|
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
|
|
if (lu_gp != default_lu_gp)
|
|
__core_alua_attach_lu_gp_mem(lu_gp_mem,
|
|
default_lu_gp);
|
|
else
|
|
lu_gp_mem->lu_gp = NULL;
|
|
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
|
|
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
}
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
|
|
kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
|
|
}
|
|
|
|
void core_alua_free_lu_gp_mem(struct se_device *dev)
|
|
{
|
|
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
|
|
struct t10_alua *alua = &su_dev->t10_alua;
|
|
struct t10_alua_lu_gp *lu_gp;
|
|
struct t10_alua_lu_gp_member *lu_gp_mem;
|
|
|
|
if (alua->alua_type != SPC3_ALUA_EMULATED)
|
|
return;
|
|
|
|
lu_gp_mem = dev->dev_alua_lu_gp_mem;
|
|
if (!lu_gp_mem)
|
|
return;
|
|
|
|
while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
|
|
cpu_relax();
|
|
|
|
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
|
|
lu_gp = lu_gp_mem->lu_gp;
|
|
if (lu_gp) {
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
if (lu_gp_mem->lu_gp_assoc) {
|
|
list_del(&lu_gp_mem->lu_gp_mem_list);
|
|
lu_gp->lu_gp_members--;
|
|
lu_gp_mem->lu_gp_assoc = 0;
|
|
}
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
lu_gp_mem->lu_gp = NULL;
|
|
}
|
|
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
|
|
|
|
kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
|
|
}
|
|
|
|
struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
|
|
{
|
|
struct t10_alua_lu_gp *lu_gp;
|
|
struct config_item *ci;
|
|
|
|
spin_lock(&lu_gps_lock);
|
|
list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
|
|
if (!lu_gp->lu_gp_valid_id)
|
|
continue;
|
|
ci = &lu_gp->lu_gp_group.cg_item;
|
|
if (!strcmp(config_item_name(ci), name)) {
|
|
atomic_inc(&lu_gp->lu_gp_ref_cnt);
|
|
spin_unlock(&lu_gps_lock);
|
|
return lu_gp;
|
|
}
|
|
}
|
|
spin_unlock(&lu_gps_lock);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
|
|
{
|
|
spin_lock(&lu_gps_lock);
|
|
atomic_dec(&lu_gp->lu_gp_ref_cnt);
|
|
spin_unlock(&lu_gps_lock);
|
|
}
|
|
|
|
/*
|
|
* Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
|
|
*/
|
|
void __core_alua_attach_lu_gp_mem(
|
|
struct t10_alua_lu_gp_member *lu_gp_mem,
|
|
struct t10_alua_lu_gp *lu_gp)
|
|
{
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
lu_gp_mem->lu_gp = lu_gp;
|
|
lu_gp_mem->lu_gp_assoc = 1;
|
|
list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
|
|
lu_gp->lu_gp_members++;
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
}
|
|
|
|
/*
|
|
* Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
|
|
*/
|
|
void __core_alua_drop_lu_gp_mem(
|
|
struct t10_alua_lu_gp_member *lu_gp_mem,
|
|
struct t10_alua_lu_gp *lu_gp)
|
|
{
|
|
spin_lock(&lu_gp->lu_gp_lock);
|
|
list_del(&lu_gp_mem->lu_gp_mem_list);
|
|
lu_gp_mem->lu_gp = NULL;
|
|
lu_gp_mem->lu_gp_assoc = 0;
|
|
lu_gp->lu_gp_members--;
|
|
spin_unlock(&lu_gp->lu_gp_lock);
|
|
}
|
|
|
|
struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
|
|
struct se_subsystem_dev *su_dev,
|
|
const char *name,
|
|
int def_group)
|
|
{
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
|
|
tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
|
|
if (!tg_pt_gp) {
|
|
pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
|
|
return NULL;
|
|
}
|
|
INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
|
|
INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
|
|
mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
|
|
spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
|
|
atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
|
|
tg_pt_gp->tg_pt_gp_su_dev = su_dev;
|
|
tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
|
|
atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
|
|
ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
|
|
/*
|
|
* Enable both explict and implict ALUA support by default
|
|
*/
|
|
tg_pt_gp->tg_pt_gp_alua_access_type =
|
|
TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
|
|
/*
|
|
* Set the default Active/NonOptimized Delay in milliseconds
|
|
*/
|
|
tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
|
|
tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
|
|
tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS;
|
|
|
|
if (def_group) {
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
tg_pt_gp->tg_pt_gp_id =
|
|
su_dev->t10_alua.alua_tg_pt_gps_counter++;
|
|
tg_pt_gp->tg_pt_gp_valid_id = 1;
|
|
su_dev->t10_alua.alua_tg_pt_gps_count++;
|
|
list_add_tail(&tg_pt_gp->tg_pt_gp_list,
|
|
&su_dev->t10_alua.tg_pt_gps_list);
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
}
|
|
|
|
return tg_pt_gp;
|
|
}
|
|
|
|
int core_alua_set_tg_pt_gp_id(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
u16 tg_pt_gp_id)
|
|
{
|
|
struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
|
|
u16 tg_pt_gp_id_tmp;
|
|
/*
|
|
* The tg_pt_gp->tg_pt_gp_id may only be set once..
|
|
*/
|
|
if (tg_pt_gp->tg_pt_gp_valid_id) {
|
|
pr_warn("ALUA TG PT Group already has a valid ID,"
|
|
" ignoring request\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
|
|
pr_err("Maximum ALUA alua_tg_pt_gps_count:"
|
|
" 0x0000ffff reached\n");
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
|
|
return -ENOSPC;
|
|
}
|
|
again:
|
|
tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
|
|
su_dev->t10_alua.alua_tg_pt_gps_counter++;
|
|
|
|
list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list,
|
|
tg_pt_gp_list) {
|
|
if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
|
|
if (!tg_pt_gp_id)
|
|
goto again;
|
|
|
|
pr_err("ALUA Target Port Group ID: %hu already"
|
|
" exists, ignoring request\n", tg_pt_gp_id);
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
|
|
tg_pt_gp->tg_pt_gp_valid_id = 1;
|
|
list_add_tail(&tg_pt_gp->tg_pt_gp_list,
|
|
&su_dev->t10_alua.tg_pt_gps_list);
|
|
su_dev->t10_alua.alua_tg_pt_gps_count++;
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
|
|
struct se_port *port)
|
|
{
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
|
|
|
|
tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
|
|
GFP_KERNEL);
|
|
if (!tg_pt_gp_mem) {
|
|
pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
|
|
spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
|
|
|
|
tg_pt_gp_mem->tg_pt = port;
|
|
port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
|
|
|
|
return tg_pt_gp_mem;
|
|
}
|
|
|
|
void core_alua_free_tg_pt_gp(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
|
{
|
|
struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
|
|
/*
|
|
* Once we have reached this point, config_item_put() has already
|
|
* been called from target_core_alua_drop_tg_pt_gp().
|
|
*
|
|
* Here we remove *tg_pt_gp from the global list so that
|
|
* no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
|
|
* can be made while we are releasing struct t10_alua_tg_pt_gp.
|
|
*/
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
list_del(&tg_pt_gp->tg_pt_gp_list);
|
|
su_dev->t10_alua.alua_tg_pt_gps_counter--;
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
/*
|
|
* Allow a struct t10_alua_tg_pt_gp_member * referenced by
|
|
* core_alua_get_tg_pt_gp_by_name() in
|
|
* target_core_configfs.c:target_core_store_alua_tg_pt_gp()
|
|
* to be released with core_alua_put_tg_pt_gp_from_name().
|
|
*/
|
|
while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
|
|
cpu_relax();
|
|
/*
|
|
* Release reference to struct t10_alua_tg_pt_gp from all associated
|
|
* struct se_port.
|
|
*/
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
|
|
&tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
|
|
if (tg_pt_gp_mem->tg_pt_gp_assoc) {
|
|
list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
|
|
tg_pt_gp->tg_pt_gp_members--;
|
|
tg_pt_gp_mem->tg_pt_gp_assoc = 0;
|
|
}
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
/*
|
|
* tg_pt_gp_mem is associated with a single
|
|
* se_port->sep_alua_tg_pt_gp_mem, and is released via
|
|
* core_alua_free_tg_pt_gp_mem().
|
|
*
|
|
* If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
|
|
* assume we want to re-assocate a given tg_pt_gp_mem with
|
|
* default_tg_pt_gp.
|
|
*/
|
|
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) {
|
|
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
|
|
su_dev->t10_alua.default_tg_pt_gp);
|
|
} else
|
|
tg_pt_gp_mem->tg_pt_gp = NULL;
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
}
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
|
|
kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
|
|
}
|
|
|
|
void core_alua_free_tg_pt_gp_mem(struct se_port *port)
|
|
{
|
|
struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
|
|
struct t10_alua *alua = &su_dev->t10_alua;
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
|
|
|
|
if (alua->alua_type != SPC3_ALUA_EMULATED)
|
|
return;
|
|
|
|
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
|
|
if (!tg_pt_gp_mem)
|
|
return;
|
|
|
|
while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
|
|
cpu_relax();
|
|
|
|
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
|
|
if (tg_pt_gp) {
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
if (tg_pt_gp_mem->tg_pt_gp_assoc) {
|
|
list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
|
|
tg_pt_gp->tg_pt_gp_members--;
|
|
tg_pt_gp_mem->tg_pt_gp_assoc = 0;
|
|
}
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
tg_pt_gp_mem->tg_pt_gp = NULL;
|
|
}
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
|
|
kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
|
|
}
|
|
|
|
static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
|
|
struct se_subsystem_dev *su_dev,
|
|
const char *name)
|
|
{
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
struct config_item *ci;
|
|
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
|
|
tg_pt_gp_list) {
|
|
if (!tg_pt_gp->tg_pt_gp_valid_id)
|
|
continue;
|
|
ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
|
|
if (!strcmp(config_item_name(ci), name)) {
|
|
atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
return tg_pt_gp;
|
|
}
|
|
}
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void core_alua_put_tg_pt_gp_from_name(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
|
{
|
|
struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
|
|
|
|
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
|
spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock);
|
|
}
|
|
|
|
/*
|
|
* Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
|
|
*/
|
|
void __core_alua_attach_tg_pt_gp_mem(
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
|
{
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
|
|
tg_pt_gp_mem->tg_pt_gp_assoc = 1;
|
|
list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
|
|
&tg_pt_gp->tg_pt_gp_mem_list);
|
|
tg_pt_gp->tg_pt_gp_members++;
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
}
|
|
|
|
/*
|
|
* Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
|
|
*/
|
|
static void __core_alua_drop_tg_pt_gp_mem(
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
|
{
|
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
|
list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
|
|
tg_pt_gp_mem->tg_pt_gp = NULL;
|
|
tg_pt_gp_mem->tg_pt_gp_assoc = 0;
|
|
tg_pt_gp->tg_pt_gp_members--;
|
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
|
}
|
|
|
|
ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
|
|
{
|
|
struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
|
|
struct config_item *tg_pt_ci;
|
|
struct t10_alua *alua = &su_dev->t10_alua;
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
|
|
ssize_t len = 0;
|
|
|
|
if (alua->alua_type != SPC3_ALUA_EMULATED)
|
|
return len;
|
|
|
|
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
|
|
if (!tg_pt_gp_mem)
|
|
return len;
|
|
|
|
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
|
|
if (tg_pt_gp) {
|
|
tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
|
|
len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
|
|
" %hu\nTG Port Primary Access State: %s\nTG Port "
|
|
"Primary Access Status: %s\nTG Port Secondary Access"
|
|
" State: %s\nTG Port Secondary Access Status: %s\n",
|
|
config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
|
|
core_alua_dump_state(atomic_read(
|
|
&tg_pt_gp->tg_pt_gp_alua_access_state)),
|
|
core_alua_dump_status(
|
|
tg_pt_gp->tg_pt_gp_alua_access_status),
|
|
(atomic_read(&port->sep_tg_pt_secondary_offline)) ?
|
|
"Offline" : "None",
|
|
core_alua_dump_status(port->sep_tg_pt_secondary_stat));
|
|
}
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
|
|
return len;
|
|
}
|
|
|
|
ssize_t core_alua_store_tg_pt_gp_info(
|
|
struct se_port *port,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
struct se_portal_group *tpg;
|
|
struct se_lun *lun;
|
|
struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev;
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
|
|
unsigned char buf[TG_PT_GROUP_NAME_BUF];
|
|
int move = 0;
|
|
|
|
tpg = port->sep_tpg;
|
|
lun = port->sep_lun;
|
|
|
|
if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) {
|
|
pr_warn("SPC3_ALUA_EMULATED not enabled for"
|
|
" %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg),
|
|
config_item_name(&lun->lun_group.cg_item));
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (count > TG_PT_GROUP_NAME_BUF) {
|
|
pr_err("ALUA Target Port Group alias too large!\n");
|
|
return -EINVAL;
|
|
}
|
|
memset(buf, 0, TG_PT_GROUP_NAME_BUF);
|
|
memcpy(buf, page, count);
|
|
/*
|
|
* Any ALUA target port group alias besides "NULL" means we will be
|
|
* making a new group association.
|
|
*/
|
|
if (strcmp(strstrip(buf), "NULL")) {
|
|
/*
|
|
* core_alua_get_tg_pt_gp_by_name() will increment reference to
|
|
* struct t10_alua_tg_pt_gp. This reference is released with
|
|
* core_alua_put_tg_pt_gp_from_name() below.
|
|
*/
|
|
tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev,
|
|
strstrip(buf));
|
|
if (!tg_pt_gp_new)
|
|
return -ENODEV;
|
|
}
|
|
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
|
|
if (!tg_pt_gp_mem) {
|
|
if (tg_pt_gp_new)
|
|
core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
|
|
pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
|
|
if (tg_pt_gp) {
|
|
/*
|
|
* Clearing an existing tg_pt_gp association, and replacing
|
|
* with the default_tg_pt_gp.
|
|
*/
|
|
if (!tg_pt_gp_new) {
|
|
pr_debug("Target_Core_ConfigFS: Moving"
|
|
" %s/tpgt_%hu/%s from ALUA Target Port Group:"
|
|
" alua/%s, ID: %hu back to"
|
|
" default_tg_pt_gp\n",
|
|
tpg->se_tpg_tfo->tpg_get_wwn(tpg),
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg),
|
|
config_item_name(&lun->lun_group.cg_item),
|
|
config_item_name(
|
|
&tg_pt_gp->tg_pt_gp_group.cg_item),
|
|
tg_pt_gp->tg_pt_gp_id);
|
|
|
|
__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
|
|
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
|
|
su_dev->t10_alua.default_tg_pt_gp);
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
|
|
return count;
|
|
}
|
|
/*
|
|
* Removing existing association of tg_pt_gp_mem with tg_pt_gp
|
|
*/
|
|
__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
|
|
move = 1;
|
|
}
|
|
/*
|
|
* Associate tg_pt_gp_mem with tg_pt_gp_new.
|
|
*/
|
|
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
|
|
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
|
|
pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
|
|
" Target Port Group: alua/%s, ID: %hu\n", (move) ?
|
|
"Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
|
|
tpg->se_tpg_tfo->tpg_get_tag(tpg),
|
|
config_item_name(&lun->lun_group.cg_item),
|
|
config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
|
|
tg_pt_gp_new->tg_pt_gp_id);
|
|
|
|
core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_access_type(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
char *page)
|
|
{
|
|
if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
|
|
(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
|
|
return sprintf(page, "Implict and Explict\n");
|
|
else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
|
|
return sprintf(page, "Implict\n");
|
|
else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
|
|
return sprintf(page, "Explict\n");
|
|
else
|
|
return sprintf(page, "None\n");
|
|
}
|
|
|
|
ssize_t core_alua_store_access_type(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract alua_access_type\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
|
|
pr_err("Illegal value for alua_access_type:"
|
|
" %lu\n", tmp);
|
|
return -EINVAL;
|
|
}
|
|
if (tmp == 3)
|
|
tg_pt_gp->tg_pt_gp_alua_access_type =
|
|
TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
|
|
else if (tmp == 2)
|
|
tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
|
|
else if (tmp == 1)
|
|
tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
|
|
else
|
|
tg_pt_gp->tg_pt_gp_alua_access_type = 0;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_nonop_delay_msecs(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
|
|
}
|
|
|
|
ssize_t core_alua_store_nonop_delay_msecs(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract nonop_delay_msecs\n");
|
|
return -EINVAL;
|
|
}
|
|
if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
|
|
pr_err("Passed nonop_delay_msecs: %lu, exceeds"
|
|
" ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
|
|
ALUA_MAX_NONOP_DELAY_MSECS);
|
|
return -EINVAL;
|
|
}
|
|
tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_trans_delay_msecs(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
|
|
}
|
|
|
|
ssize_t core_alua_store_trans_delay_msecs(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract trans_delay_msecs\n");
|
|
return -EINVAL;
|
|
}
|
|
if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
|
|
pr_err("Passed trans_delay_msecs: %lu, exceeds"
|
|
" ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
|
|
ALUA_MAX_TRANS_DELAY_MSECS);
|
|
return -EINVAL;
|
|
}
|
|
tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_implict_trans_secs(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs);
|
|
}
|
|
|
|
ssize_t core_alua_store_implict_trans_secs(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract implict_trans_secs\n");
|
|
return -EINVAL;
|
|
}
|
|
if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) {
|
|
pr_err("Passed implict_trans_secs: %lu, exceeds"
|
|
" ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp,
|
|
ALUA_MAX_IMPLICT_TRANS_SECS);
|
|
return -EINVAL;
|
|
}
|
|
tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_preferred_bit(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
|
|
}
|
|
|
|
ssize_t core_alua_store_preferred_bit(
|
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract preferred ALUA value\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((tmp != 0) && (tmp != 1)) {
|
|
pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
|
|
return -EINVAL;
|
|
}
|
|
tg_pt_gp->tg_pt_gp_pref = (int)tmp;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
|
|
{
|
|
if (!lun->lun_sep)
|
|
return -ENODEV;
|
|
|
|
return sprintf(page, "%d\n",
|
|
atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
|
|
}
|
|
|
|
ssize_t core_alua_store_offline_bit(
|
|
struct se_lun *lun,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
if (!lun->lun_sep)
|
|
return -ENODEV;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract alua_tg_pt_offline value\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((tmp != 0) && (tmp != 1)) {
|
|
pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
|
|
tmp);
|
|
return -EINVAL;
|
|
}
|
|
tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
|
|
if (!tg_pt_gp_mem) {
|
|
pr_err("Unable to locate *tg_pt_gp_mem\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
|
|
lun->lun_sep, 0, (int)tmp);
|
|
if (ret < 0)
|
|
return -EINVAL;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_secondary_status(
|
|
struct se_lun *lun,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
|
|
}
|
|
|
|
ssize_t core_alua_store_secondary_status(
|
|
struct se_lun *lun,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract alua_tg_pt_status\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((tmp != ALUA_STATUS_NONE) &&
|
|
(tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
|
|
(tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
|
|
pr_err("Illegal value for alua_tg_pt_status: %lu\n",
|
|
tmp);
|
|
return -EINVAL;
|
|
}
|
|
lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
|
|
|
|
return count;
|
|
}
|
|
|
|
ssize_t core_alua_show_secondary_write_metadata(
|
|
struct se_lun *lun,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "%d\n",
|
|
lun->lun_sep->sep_tg_pt_secondary_write_md);
|
|
}
|
|
|
|
ssize_t core_alua_store_secondary_write_metadata(
|
|
struct se_lun *lun,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
unsigned long tmp;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(page, 0, &tmp);
|
|
if (ret < 0) {
|
|
pr_err("Unable to extract alua_tg_pt_write_md\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((tmp != 0) && (tmp != 1)) {
|
|
pr_err("Illegal value for alua_tg_pt_write_md:"
|
|
" %lu\n", tmp);
|
|
return -EINVAL;
|
|
}
|
|
lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
|
|
|
|
return count;
|
|
}
|
|
|
|
int core_setup_alua(struct se_device *dev, int force_pt)
|
|
{
|
|
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
|
|
struct t10_alua *alua = &su_dev->t10_alua;
|
|
struct t10_alua_lu_gp_member *lu_gp_mem;
|
|
/*
|
|
* If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
|
|
* of the Underlying SCSI hardware. In Linux/SCSI terms, this can
|
|
* cause a problem because libata and some SATA RAID HBAs appear
|
|
* under Linux/SCSI, but emulate SCSI logic themselves.
|
|
*/
|
|
if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
|
|
!(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) {
|
|
alua->alua_type = SPC_ALUA_PASSTHROUGH;
|
|
alua->alua_state_check = &core_alua_state_check_nop;
|
|
pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
|
|
" emulation\n", dev->transport->name);
|
|
return 0;
|
|
}
|
|
/*
|
|
* If SPC-3 or above is reported by real or emulated struct se_device,
|
|
* use emulated ALUA.
|
|
*/
|
|
if (dev->transport->get_device_rev(dev) >= SCSI_3) {
|
|
pr_debug("%s: Enabling ALUA Emulation for SPC-3"
|
|
" device\n", dev->transport->name);
|
|
/*
|
|
* Associate this struct se_device with the default ALUA
|
|
* LUN Group.
|
|
*/
|
|
lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
|
|
if (IS_ERR(lu_gp_mem))
|
|
return PTR_ERR(lu_gp_mem);
|
|
|
|
alua->alua_type = SPC3_ALUA_EMULATED;
|
|
alua->alua_state_check = &core_alua_state_check;
|
|
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
|
|
__core_alua_attach_lu_gp_mem(lu_gp_mem,
|
|
default_lu_gp);
|
|
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
|
|
|
|
pr_debug("%s: Adding to default ALUA LU Group:"
|
|
" core/alua/lu_gps/default_lu_gp\n",
|
|
dev->transport->name);
|
|
} else {
|
|
alua->alua_type = SPC2_ALUA_DISABLED;
|
|
alua->alua_state_check = &core_alua_state_check_nop;
|
|
pr_debug("%s: Disabling ALUA Emulation for SPC-2"
|
|
" device\n", dev->transport->name);
|
|
}
|
|
|
|
return 0;
|
|
}
|