2291 lines
60 KiB
C
2291 lines
60 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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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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* (c) Copyright 2009-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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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/delay.h>
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#include <linux/export.h>
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#include <linux/fcntl.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <scsi/scsi_proto.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_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 sense_reason_t core_alua_check_transition(int state, int valid,
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int *primary, int explicit);
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static int core_alua_set_tg_pt_secondary_state(
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struct se_lun *lun, int explicit, int offline);
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static char *core_alua_dump_state(int state);
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static void __target_attach_tg_pt_gp(struct se_lun *lun,
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struct t10_alua_tg_pt_gp *tg_pt_gp);
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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 REFERRALS
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*
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* See sbc3r35 section 5.23
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*/
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sense_reason_t
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target_emulate_report_referrals(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct t10_alua_lba_map *map;
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struct t10_alua_lba_map_member *map_mem;
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unsigned char *buf;
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u32 rd_len = 0, off;
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if (cmd->data_length < 4) {
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pr_warn("REPORT REFERRALS allocation length %u too"
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" small\n", cmd->data_length);
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return TCM_INVALID_CDB_FIELD;
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}
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buf = transport_kmap_data_sg(cmd);
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if (!buf)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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off = 4;
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spin_lock(&dev->t10_alua.lba_map_lock);
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if (list_empty(&dev->t10_alua.lba_map_list)) {
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spin_unlock(&dev->t10_alua.lba_map_lock);
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transport_kunmap_data_sg(cmd);
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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list_for_each_entry(map, &dev->t10_alua.lba_map_list,
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lba_map_list) {
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int desc_num = off + 3;
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int pg_num;
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off += 4;
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if (cmd->data_length > off)
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put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
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off += 8;
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if (cmd->data_length > off)
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put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
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off += 8;
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rd_len += 20;
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pg_num = 0;
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list_for_each_entry(map_mem, &map->lba_map_mem_list,
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lba_map_mem_list) {
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int alua_state = map_mem->lba_map_mem_alua_state;
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int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
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if (cmd->data_length > off)
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buf[off] = alua_state & 0x0f;
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off += 2;
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if (cmd->data_length > off)
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buf[off] = (alua_pg_id >> 8) & 0xff;
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off++;
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if (cmd->data_length > off)
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buf[off] = (alua_pg_id & 0xff);
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off++;
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rd_len += 4;
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pg_num++;
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}
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if (cmd->data_length > desc_num)
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buf[desc_num] = pg_num;
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}
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spin_unlock(&dev->t10_alua.lba_map_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_be16(rd_len, &buf[2]);
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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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* 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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sense_reason_t
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target_emulate_report_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 t10_alua_tg_pt_gp *tg_pt_gp;
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struct se_lun *lun;
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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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return TCM_INVALID_CDB_FIELD;
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}
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buf = transport_kmap_data_sg(cmd);
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if (!buf)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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spin_lock(&dev->t10_alua.tg_pt_gps_lock);
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list_for_each_entry(tg_pt_gp, &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++] |= 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++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
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/*
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* TARGET PORT GROUP
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*/
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put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
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off += 2;
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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(lun, &tg_pt_gp->tg_pt_gp_lun_list,
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lun_tg_pt_gp_link) {
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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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put_unaligned_be16(lun->lun_rtpi, &buf[off]);
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off += 2;
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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(&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 implicit 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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spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
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tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
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if (tg_pt_gp)
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buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
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spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
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}
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transport_kunmap_data_sg(cmd);
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target_complete_cmd_with_length(cmd, GOOD, rd_len + 4);
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return 0;
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}
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/*
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* SET_TARGET_PORT_GROUPS for explicit ALUA operation.
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*
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* See spc4r17 section 6.35
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*/
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sense_reason_t
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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_lun *l_lun = cmd->se_lun;
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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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unsigned char *buf;
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unsigned char *ptr;
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sense_reason_t rc = TCM_NO_SENSE;
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u32 len = 4; /* Skip over RESERVED area in header */
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int alua_access_state, primary = 0, valid_states;
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u16 tg_pt_id, rtpi;
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if (cmd->data_length < 4) {
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pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
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" small\n", cmd->data_length);
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return TCM_INVALID_PARAMETER_LIST;
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}
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buf = transport_kmap_data_sg(cmd);
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if (!buf)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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/*
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* Determine if explicit 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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spin_lock(&l_lun->lun_tg_pt_gp_lock);
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l_tg_pt_gp = l_lun->lun_tg_pt_gp;
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if (!l_tg_pt_gp) {
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spin_unlock(&l_lun->lun_tg_pt_gp_lock);
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pr_err("Unable to access l_lun->tg_pt_gp\n");
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rc = TCM_UNSUPPORTED_SCSI_OPCODE;
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goto out;
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}
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if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
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spin_unlock(&l_lun->lun_tg_pt_gp_lock);
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pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
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" while TPGS_EXPLICIT_ALUA is disabled\n");
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rc = TCM_UNSUPPORTED_SCSI_OPCODE;
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goto out;
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}
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valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
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spin_unlock(&l_lun->lun_tg_pt_gp_lock);
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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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bool found = false;
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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, valid_states,
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&primary, 1);
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if (rc) {
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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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goto out;
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}
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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(&dev->t10_alua.tg_pt_gps_lock);
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list_for_each_entry(tg_pt_gp,
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&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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|
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if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
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continue;
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|
|
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atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
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|
|
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spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
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|
||
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if (!core_alua_do_port_transition(tg_pt_gp,
|
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dev, l_lun, nacl,
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alua_access_state, 1))
|
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found = true;
|
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|
|
||
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spin_lock(&dev->t10_alua.tg_pt_gps_lock);
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atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
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break;
|
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}
|
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spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
} else {
|
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struct se_lun *lun;
|
||
|
|
||
|
/*
|
||
|
* Extract the RELATIVE TARGET PORT IDENTIFIER to identify
|
||
|
* the Target Port in question for the the incoming
|
||
|
* SET_TARGET_PORT_GROUPS op.
|
||
|
*/
|
||
|
rtpi = get_unaligned_be16(ptr + 2);
|
||
|
/*
|
||
|
* Locate the matching relative target port identifier
|
||
|
* for the struct se_device storage object.
|
||
|
*/
|
||
|
spin_lock(&dev->se_port_lock);
|
||
|
list_for_each_entry(lun, &dev->dev_sep_list,
|
||
|
lun_dev_link) {
|
||
|
if (lun->lun_rtpi != rtpi)
|
||
|
continue;
|
||
|
|
||
|
// XXX: racy unlock
|
||
|
spin_unlock(&dev->se_port_lock);
|
||
|
|
||
|
if (!core_alua_set_tg_pt_secondary_state(
|
||
|
lun, 1, 1))
|
||
|
found = true;
|
||
|
|
||
|
spin_lock(&dev->se_port_lock);
|
||
|
break;
|
||
|
}
|
||
|
spin_unlock(&dev->se_port_lock);
|
||
|
}
|
||
|
|
||
|
if (!found) {
|
||
|
rc = TCM_INVALID_PARAMETER_LIST;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
ptr += 4;
|
||
|
len += 4;
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
transport_kunmap_data_sg(cmd);
|
||
|
if (!rc)
|
||
|
target_complete_cmd(cmd, GOOD);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
|
||
|
{
|
||
|
/*
|
||
|
* Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
|
||
|
* The ALUA additional sense code qualifier (ASCQ) is determined
|
||
|
* by the ALUA primary or secondary access state..
|
||
|
*/
|
||
|
pr_debug("[%s]: ALUA TG Port not available, "
|
||
|
"SenseKey: NOT_READY, ASC/ASCQ: "
|
||
|
"0x04/0x%02x\n",
|
||
|
cmd->se_tfo->fabric_name, alua_ascq);
|
||
|
|
||
|
cmd->scsi_asc = 0x04;
|
||
|
cmd->scsi_ascq = alua_ascq;
|
||
|
}
|
||
|
|
||
|
static inline void core_alua_state_nonoptimized(
|
||
|
struct se_cmd *cmd,
|
||
|
unsigned char *cdb,
|
||
|
int nonop_delay_msecs)
|
||
|
{
|
||
|
/*
|
||
|
* Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
|
||
|
* later to determine if processing of this cmd needs to be
|
||
|
* temporarily delayed for the Active/NonOptimized primary access state.
|
||
|
*/
|
||
|
cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
|
||
|
cmd->alua_nonop_delay = nonop_delay_msecs;
|
||
|
}
|
||
|
|
||
|
static inline int core_alua_state_lba_dependent(
|
||
|
struct se_cmd *cmd,
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
struct se_device *dev = cmd->se_dev;
|
||
|
u64 segment_size, segment_mult, sectors, lba;
|
||
|
|
||
|
/* Only need to check for cdb actually containing LBAs */
|
||
|
if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
|
||
|
return 0;
|
||
|
|
||
|
spin_lock(&dev->t10_alua.lba_map_lock);
|
||
|
segment_size = dev->t10_alua.lba_map_segment_size;
|
||
|
segment_mult = dev->t10_alua.lba_map_segment_multiplier;
|
||
|
sectors = cmd->data_length / dev->dev_attrib.block_size;
|
||
|
|
||
|
lba = cmd->t_task_lba;
|
||
|
while (lba < cmd->t_task_lba + sectors) {
|
||
|
struct t10_alua_lba_map *cur_map = NULL, *map;
|
||
|
struct t10_alua_lba_map_member *map_mem;
|
||
|
|
||
|
list_for_each_entry(map, &dev->t10_alua.lba_map_list,
|
||
|
lba_map_list) {
|
||
|
u64 start_lba, last_lba;
|
||
|
u64 first_lba = map->lba_map_first_lba;
|
||
|
|
||
|
if (segment_mult) {
|
||
|
u64 tmp = lba;
|
||
|
start_lba = do_div(tmp, segment_size * segment_mult);
|
||
|
|
||
|
last_lba = first_lba + segment_size - 1;
|
||
|
if (start_lba >= first_lba &&
|
||
|
start_lba <= last_lba) {
|
||
|
lba += segment_size;
|
||
|
cur_map = map;
|
||
|
break;
|
||
|
}
|
||
|
} else {
|
||
|
last_lba = map->lba_map_last_lba;
|
||
|
if (lba >= first_lba && lba <= last_lba) {
|
||
|
lba = last_lba + 1;
|
||
|
cur_map = map;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
if (!cur_map) {
|
||
|
spin_unlock(&dev->t10_alua.lba_map_lock);
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
|
||
|
return 1;
|
||
|
}
|
||
|
list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
|
||
|
lba_map_mem_list) {
|
||
|
if (map_mem->lba_map_mem_alua_pg_id !=
|
||
|
tg_pt_gp->tg_pt_gp_id)
|
||
|
continue;
|
||
|
switch(map_mem->lba_map_mem_alua_state) {
|
||
|
case ALUA_ACCESS_STATE_STANDBY:
|
||
|
spin_unlock(&dev->t10_alua.lba_map_lock);
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
|
||
|
return 1;
|
||
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
||
|
spin_unlock(&dev->t10_alua.lba_map_lock);
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
|
||
|
return 1;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
spin_unlock(&dev->t10_alua.lba_map_lock);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static inline int core_alua_state_standby(
|
||
|
struct se_cmd *cmd,
|
||
|
unsigned char *cdb)
|
||
|
{
|
||
|
/*
|
||
|
* Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
|
||
|
* spc4r17 section 5.9.2.4.4
|
||
|
*/
|
||
|
switch (cdb[0]) {
|
||
|
case INQUIRY:
|
||
|
case LOG_SELECT:
|
||
|
case LOG_SENSE:
|
||
|
case MODE_SELECT:
|
||
|
case MODE_SENSE:
|
||
|
case REPORT_LUNS:
|
||
|
case RECEIVE_DIAGNOSTIC:
|
||
|
case SEND_DIAGNOSTIC:
|
||
|
case READ_CAPACITY:
|
||
|
return 0;
|
||
|
case SERVICE_ACTION_IN_16:
|
||
|
switch (cdb[1] & 0x1f) {
|
||
|
case SAI_READ_CAPACITY_16:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
|
||
|
return 1;
|
||
|
}
|
||
|
case MAINTENANCE_IN:
|
||
|
switch (cdb[1] & 0x1f) {
|
||
|
case MI_REPORT_TARGET_PGS:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
|
||
|
return 1;
|
||
|
}
|
||
|
case MAINTENANCE_OUT:
|
||
|
switch (cdb[1]) {
|
||
|
case MO_SET_TARGET_PGS:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, 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:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static inline int core_alua_state_unavailable(
|
||
|
struct se_cmd *cmd,
|
||
|
unsigned char *cdb)
|
||
|
{
|
||
|
/*
|
||
|
* 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:
|
||
|
return 0;
|
||
|
case MAINTENANCE_IN:
|
||
|
switch (cdb[1] & 0x1f) {
|
||
|
case MI_REPORT_TARGET_PGS:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
|
||
|
return 1;
|
||
|
}
|
||
|
case MAINTENANCE_OUT:
|
||
|
switch (cdb[1]) {
|
||
|
case MO_SET_TARGET_PGS:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
|
||
|
return 1;
|
||
|
}
|
||
|
case REQUEST_SENSE:
|
||
|
case READ_BUFFER:
|
||
|
case WRITE_BUFFER:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static inline int core_alua_state_transition(
|
||
|
struct se_cmd *cmd,
|
||
|
unsigned char *cdb)
|
||
|
{
|
||
|
/*
|
||
|
* Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
|
||
|
* spc4r17 section 5.9.2.5
|
||
|
*/
|
||
|
switch (cdb[0]) {
|
||
|
case INQUIRY:
|
||
|
case REPORT_LUNS:
|
||
|
return 0;
|
||
|
case MAINTENANCE_IN:
|
||
|
switch (cdb[1] & 0x1f) {
|
||
|
case MI_REPORT_TARGET_PGS:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
|
||
|
return 1;
|
||
|
}
|
||
|
case REQUEST_SENSE:
|
||
|
case READ_BUFFER:
|
||
|
case WRITE_BUFFER:
|
||
|
return 0;
|
||
|
default:
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* return 1: Is used to signal LUN not accessible, and check condition/not ready
|
||
|
* return 0: Used to signal success
|
||
|
* return -1: Used to signal failure, and invalid cdb field
|
||
|
*/
|
||
|
sense_reason_t
|
||
|
target_alua_state_check(struct se_cmd *cmd)
|
||
|
{
|
||
|
struct se_device *dev = cmd->se_dev;
|
||
|
unsigned char *cdb = cmd->t_task_cdb;
|
||
|
struct se_lun *lun = cmd->se_lun;
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
||
|
int out_alua_state, nonop_delay_msecs;
|
||
|
|
||
|
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
|
||
|
return 0;
|
||
|
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
|
||
|
return 0;
|
||
|
|
||
|
/*
|
||
|
* First, check for a struct se_port specific secondary ALUA target port
|
||
|
* access state: OFFLINE
|
||
|
*/
|
||
|
if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
|
||
|
pr_debug("ALUA: Got secondary offline status for local"
|
||
|
" target port\n");
|
||
|
set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
|
||
|
return TCM_CHECK_CONDITION_NOT_READY;
|
||
|
}
|
||
|
|
||
|
if (!lun->lun_tg_pt_gp)
|
||
|
return 0;
|
||
|
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
tg_pt_gp = lun->lun_tg_pt_gp;
|
||
|
out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
|
||
|
nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
|
||
|
|
||
|
// XXX: keeps using tg_pt_gp witout reference after unlock
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_lock);
|
||
|
/*
|
||
|
* Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED 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_OPTIMIZED)
|
||
|
return 0;
|
||
|
|
||
|
switch (out_alua_state) {
|
||
|
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
|
||
|
core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_STANDBY:
|
||
|
if (core_alua_state_standby(cmd, cdb))
|
||
|
return TCM_CHECK_CONDITION_NOT_READY;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
||
|
if (core_alua_state_unavailable(cmd, cdb))
|
||
|
return TCM_CHECK_CONDITION_NOT_READY;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_TRANSITION:
|
||
|
if (core_alua_state_transition(cmd, cdb))
|
||
|
return TCM_CHECK_CONDITION_NOT_READY;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
|
||
|
if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
|
||
|
return TCM_CHECK_CONDITION_NOT_READY;
|
||
|
break;
|
||
|
/*
|
||
|
* OFFLINE is a secondary ALUA target port group access state, that is
|
||
|
* handled above with struct se_lun->lun_tg_pt_secondary_offline=1
|
||
|
*/
|
||
|
case ALUA_ACCESS_STATE_OFFLINE:
|
||
|
default:
|
||
|
pr_err("Unknown ALUA access state: 0x%02x\n",
|
||
|
out_alua_state);
|
||
|
return TCM_INVALID_CDB_FIELD;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Check implicit and explicit ALUA state change request.
|
||
|
*/
|
||
|
static sense_reason_t
|
||
|
core_alua_check_transition(int state, int valid, int *primary, int explicit)
|
||
|
{
|
||
|
/*
|
||
|
* OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
|
||
|
* defined as primary target port asymmetric access states.
|
||
|
*/
|
||
|
switch (state) {
|
||
|
case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
|
||
|
if (!(valid & ALUA_AO_SUP))
|
||
|
goto not_supported;
|
||
|
*primary = 1;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
|
||
|
if (!(valid & ALUA_AN_SUP))
|
||
|
goto not_supported;
|
||
|
*primary = 1;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_STANDBY:
|
||
|
if (!(valid & ALUA_S_SUP))
|
||
|
goto not_supported;
|
||
|
*primary = 1;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
||
|
if (!(valid & ALUA_U_SUP))
|
||
|
goto not_supported;
|
||
|
*primary = 1;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
|
||
|
if (!(valid & ALUA_LBD_SUP))
|
||
|
goto not_supported;
|
||
|
*primary = 1;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_OFFLINE:
|
||
|
/*
|
||
|
* OFFLINE state is defined as a secondary target port
|
||
|
* asymmetric access state.
|
||
|
*/
|
||
|
if (!(valid & ALUA_O_SUP))
|
||
|
goto not_supported;
|
||
|
*primary = 0;
|
||
|
break;
|
||
|
case ALUA_ACCESS_STATE_TRANSITION:
|
||
|
if (!(valid & ALUA_T_SUP) || explicit)
|
||
|
/*
|
||
|
* Transitioning is set internally and by tcmu daemon,
|
||
|
* and cannot be selected through a STPG.
|
||
|
*/
|
||
|
goto not_supported;
|
||
|
*primary = 0;
|
||
|
break;
|
||
|
default:
|
||
|
pr_err("Unknown ALUA access state: 0x%02x\n", state);
|
||
|
return TCM_INVALID_PARAMETER_LIST;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
not_supported:
|
||
|
pr_err("ALUA access state %s not supported",
|
||
|
core_alua_dump_state(state));
|
||
|
return TCM_INVALID_PARAMETER_LIST;
|
||
|
}
|
||
|
|
||
|
static char *core_alua_dump_state(int state)
|
||
|
{
|
||
|
switch (state) {
|
||
|
case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
|
||
|
return "Active/Optimized";
|
||
|
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
|
||
|
return "Active/NonOptimized";
|
||
|
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
|
||
|
return "LBA Dependent";
|
||
|
case ALUA_ACCESS_STATE_STANDBY:
|
||
|
return "Standby";
|
||
|
case ALUA_ACCESS_STATE_UNAVAILABLE:
|
||
|
return "Unavailable";
|
||
|
case ALUA_ACCESS_STATE_OFFLINE:
|
||
|
return "Offline";
|
||
|
case ALUA_ACCESS_STATE_TRANSITION:
|
||
|
return "Transitioning";
|
||
|
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_EXPLICIT_STPG:
|
||
|
return "Altered by Explicit STPG";
|
||
|
case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
|
||
|
return "Altered by Implicit 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);
|
||
|
|
||
|
static int core_alua_write_tpg_metadata(
|
||
|
const char *path,
|
||
|
unsigned char *md_buf,
|
||
|
u32 md_buf_len)
|
||
|
{
|
||
|
struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
|
||
|
loff_t pos = 0;
|
||
|
int ret;
|
||
|
|
||
|
if (IS_ERR(file)) {
|
||
|
pr_err("filp_open(%s) for ALUA metadata failed\n", path);
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
ret = kernel_write(file, md_buf, md_buf_len, &pos);
|
||
|
if (ret < 0)
|
||
|
pr_err("Error writing ALUA metadata file: %s\n", path);
|
||
|
fput(file);
|
||
|
return (ret < 0) ? -EIO : 0;
|
||
|
}
|
||
|
|
||
|
static int core_alua_update_tpg_primary_metadata(
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
unsigned char *md_buf;
|
||
|
struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
|
||
|
char *path;
|
||
|
int len, rc;
|
||
|
|
||
|
lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex);
|
||
|
|
||
|
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
|
||
|
if (!md_buf) {
|
||
|
pr_err("Unable to allocate buf for ALUA metadata\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
len = snprintf(md_buf, ALUA_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,
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_state,
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_status);
|
||
|
|
||
|
rc = -ENOMEM;
|
||
|
path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
|
||
|
&wwn->unit_serial[0],
|
||
|
config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
|
||
|
if (path) {
|
||
|
rc = core_alua_write_tpg_metadata(path, md_buf, len);
|
||
|
kfree(path);
|
||
|
}
|
||
|
kfree(md_buf);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
struct se_dev_entry *se_deve;
|
||
|
struct se_lun *lun;
|
||
|
struct se_lun_acl *lacl;
|
||
|
|
||
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
|
||
|
lun_tg_pt_gp_link) {
|
||
|
/*
|
||
|
* 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 CHANGED.
|
||
|
*
|
||
|
* 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
|
||
|
*/
|
||
|
if (!percpu_ref_tryget_live(&lun->lun_ref))
|
||
|
continue;
|
||
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
|
||
|
spin_lock(&lun->lun_deve_lock);
|
||
|
list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
|
||
|
lacl = rcu_dereference_check(se_deve->se_lun_acl,
|
||
|
lockdep_is_held(&lun->lun_deve_lock));
|
||
|
|
||
|
/*
|
||
|
* spc4r37 p.242:
|
||
|
* 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 was received.
|
||
|
*/
|
||
|
if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
|
||
|
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
|
||
|
(tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
|
||
|
(tg_pt_gp->tg_pt_gp_alua_lun == lun))
|
||
|
continue;
|
||
|
|
||
|
/*
|
||
|
* se_deve->se_lun_acl pointer may be NULL for a
|
||
|
* entry created without explicit Node+MappedLUN ACLs
|
||
|
*/
|
||
|
if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
|
||
|
(tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
|
||
|
continue;
|
||
|
|
||
|
core_scsi3_ua_allocate(se_deve, 0x2A,
|
||
|
ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
|
||
|
}
|
||
|
spin_unlock(&lun->lun_deve_lock);
|
||
|
|
||
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
percpu_ref_put(&lun->lun_ref);
|
||
|
}
|
||
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
}
|
||
|
|
||
|
static int core_alua_do_transition_tg_pt(
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
||
|
int new_state,
|
||
|
int explicit)
|
||
|
{
|
||
|
int prev_state;
|
||
|
|
||
|
mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
|
||
|
/* Nothing to be done here */
|
||
|
if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
|
||
|
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
|
||
|
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
|
||
|
return -EAGAIN;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Save the old primary ALUA access state, and set the current state
|
||
|
* to ALUA_ACCESS_STATE_TRANSITION.
|
||
|
*/
|
||
|
prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
|
||
|
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
|
||
|
ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
|
||
|
|
||
|
core_alua_queue_state_change_ua(tg_pt_gp);
|
||
|
|
||
|
if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
|
||
|
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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);
|
||
|
|
||
|
/*
|
||
|
* Set the current primary ALUA access state to the requested new state
|
||
|
*/
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
|
||
|
|
||
|
/*
|
||
|
* 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) {
|
||
|
core_alua_update_tpg_primary_metadata(tg_pt_gp);
|
||
|
}
|
||
|
|
||
|
pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
|
||
|
" from primary access state %s to %s\n", (explicit) ? "explicit" :
|
||
|
"implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
|
||
|
tg_pt_gp->tg_pt_gp_id,
|
||
|
core_alua_dump_state(prev_state),
|
||
|
core_alua_dump_state(new_state));
|
||
|
|
||
|
core_alua_queue_state_change_ua(tg_pt_gp);
|
||
|
|
||
|
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
|
||
|
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_lun *l_lun,
|
||
|
struct se_node_acl *l_nacl,
|
||
|
int new_state,
|
||
|
int explicit)
|
||
|
{
|
||
|
struct se_device *dev;
|
||
|
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;
|
||
|
int primary, valid_states, rc = 0;
|
||
|
|
||
|
if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
|
||
|
return -ENODEV;
|
||
|
|
||
|
valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
|
||
|
if (core_alua_check_transition(new_state, valid_states, &primary,
|
||
|
explicit) != 0)
|
||
|
return -EINVAL;
|
||
|
|
||
|
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);
|
||
|
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.
|
||
|
*/
|
||
|
l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
|
||
|
l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
|
||
|
rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
|
||
|
new_state, explicit);
|
||
|
atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
|
||
|
return rc;
|
||
|
}
|
||
|
/*
|
||
|
* 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;
|
||
|
atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
|
||
|
spin_unlock(&lu_gp->lu_gp_lock);
|
||
|
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
list_for_each_entry(tg_pt_gp,
|
||
|
&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 accessible 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) {
|
||
|
tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
|
||
|
tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
|
||
|
} else {
|
||
|
tg_pt_gp->tg_pt_gp_alua_lun = NULL;
|
||
|
tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
|
||
|
}
|
||
|
atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
||
|
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
/*
|
||
|
* core_alua_do_transition_tg_pt() will always return
|
||
|
* success.
|
||
|
*/
|
||
|
rc = core_alua_do_transition_tg_pt(tg_pt_gp,
|
||
|
new_state, explicit);
|
||
|
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
||
|
if (rc)
|
||
|
break;
|
||
|
}
|
||
|
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
|
||
|
spin_lock(&lu_gp->lu_gp_lock);
|
||
|
atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
|
||
|
}
|
||
|
spin_unlock(&lu_gp->lu_gp_lock);
|
||
|
|
||
|
if (!rc) {
|
||
|
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,
|
||
|
(explicit) ? "explicit" : "implicit",
|
||
|
core_alua_dump_state(new_state));
|
||
|
}
|
||
|
|
||
|
atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
|
||
|
{
|
||
|
struct se_portal_group *se_tpg = lun->lun_tpg;
|
||
|
unsigned char *md_buf;
|
||
|
char *path;
|
||
|
int len, rc;
|
||
|
|
||
|
mutex_lock(&lun->lun_tg_pt_md_mutex);
|
||
|
|
||
|
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
|
||
|
if (!md_buf) {
|
||
|
pr_err("Unable to allocate buf for ALUA metadata\n");
|
||
|
rc = -ENOMEM;
|
||
|
goto out_unlock;
|
||
|
}
|
||
|
|
||
|
len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
|
||
|
"alua_tg_pt_status=0x%02x\n",
|
||
|
atomic_read(&lun->lun_tg_pt_secondary_offline),
|
||
|
lun->lun_tg_pt_secondary_stat);
|
||
|
|
||
|
if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
|
||
|
path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
|
||
|
db_root, se_tpg->se_tpg_tfo->fabric_name,
|
||
|
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
|
||
|
se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
|
||
|
lun->unpacked_lun);
|
||
|
} else {
|
||
|
path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
|
||
|
db_root, se_tpg->se_tpg_tfo->fabric_name,
|
||
|
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
|
||
|
lun->unpacked_lun);
|
||
|
}
|
||
|
if (!path) {
|
||
|
rc = -ENOMEM;
|
||
|
goto out_free;
|
||
|
}
|
||
|
|
||
|
rc = core_alua_write_tpg_metadata(path, md_buf, len);
|
||
|
kfree(path);
|
||
|
out_free:
|
||
|
kfree(md_buf);
|
||
|
out_unlock:
|
||
|
mutex_unlock(&lun->lun_tg_pt_md_mutex);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static int core_alua_set_tg_pt_secondary_state(
|
||
|
struct se_lun *lun,
|
||
|
int explicit,
|
||
|
int offline)
|
||
|
{
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
||
|
int trans_delay_msecs;
|
||
|
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
tg_pt_gp = lun->lun_tg_pt_gp;
|
||
|
if (!tg_pt_gp) {
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_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_lun
|
||
|
*/
|
||
|
if (offline)
|
||
|
atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
|
||
|
else
|
||
|
atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
|
||
|
|
||
|
lun->lun_tg_pt_secondary_stat = (explicit) ?
|
||
|
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
|
||
|
ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
|
||
|
|
||
|
pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
|
||
|
" to secondary access state: %s\n", (explicit) ? "explicit" :
|
||
|
"implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
|
||
|
tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
|
||
|
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_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 (lun->lun_tg_pt_secondary_write_md)
|
||
|
core_alua_update_tpg_secondary_metadata(lun);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
struct t10_alua_lba_map *
|
||
|
core_alua_allocate_lba_map(struct list_head *list,
|
||
|
u64 first_lba, u64 last_lba)
|
||
|
{
|
||
|
struct t10_alua_lba_map *lba_map;
|
||
|
|
||
|
lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
|
||
|
if (!lba_map) {
|
||
|
pr_err("Unable to allocate struct t10_alua_lba_map\n");
|
||
|
return ERR_PTR(-ENOMEM);
|
||
|
}
|
||
|
INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
|
||
|
lba_map->lba_map_first_lba = first_lba;
|
||
|
lba_map->lba_map_last_lba = last_lba;
|
||
|
|
||
|
list_add_tail(&lba_map->lba_map_list, list);
|
||
|
return lba_map;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
|
||
|
int pg_id, int state)
|
||
|
{
|
||
|
struct t10_alua_lba_map_member *lba_map_mem;
|
||
|
|
||
|
list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
|
||
|
lba_map_mem_list) {
|
||
|
if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
|
||
|
pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
|
||
|
if (!lba_map_mem) {
|
||
|
pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
lba_map_mem->lba_map_mem_alua_state = state;
|
||
|
lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
|
||
|
|
||
|
list_add_tail(&lba_map_mem->lba_map_mem_list,
|
||
|
&lba_map->lba_map_mem_list);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
core_alua_free_lba_map(struct list_head *lba_list)
|
||
|
{
|
||
|
struct t10_alua_lba_map *lba_map, *lba_map_tmp;
|
||
|
struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
|
||
|
|
||
|
list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
|
||
|
lba_map_list) {
|
||
|
list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
|
||
|
&lba_map->lba_map_mem_list,
|
||
|
lba_map_mem_list) {
|
||
|
list_del(&lba_map_mem->lba_map_mem_list);
|
||
|
kmem_cache_free(t10_alua_lba_map_mem_cache,
|
||
|
lba_map_mem);
|
||
|
}
|
||
|
list_del(&lba_map->lba_map_list);
|
||
|
kmem_cache_free(t10_alua_lba_map_cache, lba_map);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
|
||
|
int segment_size, int segment_mult)
|
||
|
{
|
||
|
struct list_head old_lba_map_list;
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
||
|
int activate = 0, supported;
|
||
|
|
||
|
INIT_LIST_HEAD(&old_lba_map_list);
|
||
|
spin_lock(&dev->t10_alua.lba_map_lock);
|
||
|
dev->t10_alua.lba_map_segment_size = segment_size;
|
||
|
dev->t10_alua.lba_map_segment_multiplier = segment_mult;
|
||
|
list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
|
||
|
if (lba_map_list) {
|
||
|
list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
|
||
|
activate = 1;
|
||
|
}
|
||
|
spin_unlock(&dev->t10_alua.lba_map_lock);
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
|
||
|
tg_pt_gp_list) {
|
||
|
|
||
|
if (!tg_pt_gp->tg_pt_gp_valid_id)
|
||
|
continue;
|
||
|
supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
|
||
|
if (activate)
|
||
|
supported |= ALUA_LBD_SUP;
|
||
|
else
|
||
|
supported &= ~ALUA_LBD_SUP;
|
||
|
tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
|
||
|
}
|
||
|
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
core_alua_free_lba_map(&old_lba_map_list);
|
||
|
}
|
||
|
|
||
|
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-associate 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 t10_alua_lu_gp *lu_gp;
|
||
|
struct t10_alua_lu_gp_member *lu_gp_mem;
|
||
|
|
||
|
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_device *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_lun_list);
|
||
|
mutex_init(&tg_pt_gp->tg_pt_gp_transition_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_dev = dev;
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_state =
|
||
|
ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
|
||
|
/*
|
||
|
* Enable both explicit and implicit ALUA support by default
|
||
|
*/
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_type =
|
||
|
TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_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_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
|
||
|
|
||
|
/*
|
||
|
* Enable all supported states
|
||
|
*/
|
||
|
tg_pt_gp->tg_pt_gp_alua_supported_states =
|
||
|
ALUA_T_SUP | ALUA_O_SUP |
|
||
|
ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
|
||
|
|
||
|
if (def_group) {
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
tg_pt_gp->tg_pt_gp_id =
|
||
|
dev->t10_alua.alua_tg_pt_gps_counter++;
|
||
|
tg_pt_gp->tg_pt_gp_valid_id = 1;
|
||
|
dev->t10_alua.alua_tg_pt_gps_count++;
|
||
|
list_add_tail(&tg_pt_gp->tg_pt_gp_list,
|
||
|
&dev->t10_alua.tg_pt_gps_list);
|
||
|
spin_unlock(&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_device *dev = tg_pt_gp->tg_pt_gp_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(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
|
||
|
pr_err("Maximum ALUA alua_tg_pt_gps_count:"
|
||
|
" 0x0000ffff reached\n");
|
||
|
spin_unlock(&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 :
|
||
|
dev->t10_alua.alua_tg_pt_gps_counter++;
|
||
|
|
||
|
list_for_each_entry(tg_pt_gp_tmp, &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(&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,
|
||
|
&dev->t10_alua.tg_pt_gps_list);
|
||
|
dev->t10_alua.alua_tg_pt_gps_count++;
|
||
|
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
void core_alua_free_tg_pt_gp(
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
|
||
|
struct se_lun *lun, *next;
|
||
|
|
||
|
/*
|
||
|
* 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 associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
|
||
|
* can be made while we are releasing struct t10_alua_tg_pt_gp.
|
||
|
*/
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
if (tg_pt_gp->tg_pt_gp_valid_id) {
|
||
|
list_del(&tg_pt_gp->tg_pt_gp_list);
|
||
|
dev->t10_alua.alua_tg_pt_gps_count--;
|
||
|
}
|
||
|
spin_unlock(&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(lun, next,
|
||
|
&tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
|
||
|
list_del_init(&lun->lun_tg_pt_gp_link);
|
||
|
tg_pt_gp->tg_pt_gp_members--;
|
||
|
|
||
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
/*
|
||
|
* If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
|
||
|
* assume we want to re-associate a given tg_pt_gp_mem with
|
||
|
* default_tg_pt_gp.
|
||
|
*/
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
|
||
|
__target_attach_tg_pt_gp(lun,
|
||
|
dev->t10_alua.default_tg_pt_gp);
|
||
|
} else
|
||
|
lun->lun_tg_pt_gp = NULL;
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_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);
|
||
|
}
|
||
|
|
||
|
static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
|
||
|
struct se_device *dev, const char *name)
|
||
|
{
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
||
|
struct config_item *ci;
|
||
|
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
list_for_each_entry(tg_pt_gp, &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(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
return tg_pt_gp;
|
||
|
}
|
||
|
}
|
||
|
spin_unlock(&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_device *dev = tg_pt_gp->tg_pt_gp_dev;
|
||
|
|
||
|
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
|
||
|
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
|
||
|
}
|
||
|
|
||
|
static void __target_attach_tg_pt_gp(struct se_lun *lun,
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
struct se_dev_entry *se_deve;
|
||
|
|
||
|
assert_spin_locked(&lun->lun_tg_pt_gp_lock);
|
||
|
|
||
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
lun->lun_tg_pt_gp = tg_pt_gp;
|
||
|
list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
|
||
|
tg_pt_gp->tg_pt_gp_members++;
|
||
|
spin_lock(&lun->lun_deve_lock);
|
||
|
list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
|
||
|
core_scsi3_ua_allocate(se_deve, 0x3f,
|
||
|
ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
|
||
|
spin_unlock(&lun->lun_deve_lock);
|
||
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
}
|
||
|
|
||
|
void target_attach_tg_pt_gp(struct se_lun *lun,
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
__target_attach_tg_pt_gp(lun, tg_pt_gp);
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_lock);
|
||
|
}
|
||
|
|
||
|
static void __target_detach_tg_pt_gp(struct se_lun *lun,
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp)
|
||
|
{
|
||
|
assert_spin_locked(&lun->lun_tg_pt_gp_lock);
|
||
|
|
||
|
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
list_del_init(&lun->lun_tg_pt_gp_link);
|
||
|
tg_pt_gp->tg_pt_gp_members--;
|
||
|
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
|
||
|
|
||
|
lun->lun_tg_pt_gp = NULL;
|
||
|
}
|
||
|
|
||
|
void target_detach_tg_pt_gp(struct se_lun *lun)
|
||
|
{
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
||
|
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
tg_pt_gp = lun->lun_tg_pt_gp;
|
||
|
if (tg_pt_gp)
|
||
|
__target_detach_tg_pt_gp(lun, tg_pt_gp);
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_lock);
|
||
|
}
|
||
|
|
||
|
ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
|
||
|
{
|
||
|
struct config_item *tg_pt_ci;
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp;
|
||
|
ssize_t len = 0;
|
||
|
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
tg_pt_gp = lun->lun_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(
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_state),
|
||
|
core_alua_dump_status(
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_status),
|
||
|
atomic_read(&lun->lun_tg_pt_secondary_offline) ?
|
||
|
"Offline" : "None",
|
||
|
core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
|
||
|
}
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_lock);
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
ssize_t core_alua_store_tg_pt_gp_info(
|
||
|
struct se_lun *lun,
|
||
|
const char *page,
|
||
|
size_t count)
|
||
|
{
|
||
|
struct se_portal_group *tpg = lun->lun_tpg;
|
||
|
/*
|
||
|
* rcu_dereference_raw protected by se_lun->lun_group symlink
|
||
|
* reference to se_device->dev_group.
|
||
|
*/
|
||
|
struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
|
||
|
unsigned char buf[TG_PT_GROUP_NAME_BUF];
|
||
|
int move = 0;
|
||
|
|
||
|
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
|
||
|
(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
|
||
|
return -ENODEV;
|
||
|
|
||
|
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(dev,
|
||
|
strstrip(buf));
|
||
|
if (!tg_pt_gp_new)
|
||
|
return -ENODEV;
|
||
|
}
|
||
|
|
||
|
spin_lock(&lun->lun_tg_pt_gp_lock);
|
||
|
tg_pt_gp = lun->lun_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);
|
||
|
|
||
|
__target_detach_tg_pt_gp(lun, tg_pt_gp);
|
||
|
__target_attach_tg_pt_gp(lun,
|
||
|
dev->t10_alua.default_tg_pt_gp);
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_lock);
|
||
|
|
||
|
return count;
|
||
|
}
|
||
|
__target_detach_tg_pt_gp(lun, tg_pt_gp);
|
||
|
move = 1;
|
||
|
}
|
||
|
|
||
|
__target_attach_tg_pt_gp(lun, tg_pt_gp_new);
|
||
|
spin_unlock(&lun->lun_tg_pt_gp_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_EXPLICIT_ALUA) &&
|
||
|
(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
|
||
|
return sprintf(page, "Implicit and Explicit\n");
|
||
|
else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
|
||
|
return sprintf(page, "Implicit\n");
|
||
|
else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
|
||
|
return sprintf(page, "Explicit\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 = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract alua_access_type\n");
|
||
|
return ret;
|
||
|
}
|
||
|
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_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
|
||
|
else if (tmp == 2)
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
|
||
|
else if (tmp == 1)
|
||
|
tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_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 = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract nonop_delay_msecs\n");
|
||
|
return ret;
|
||
|
}
|
||
|
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 = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract trans_delay_msecs\n");
|
||
|
return ret;
|
||
|
}
|
||
|
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_implicit_trans_secs(
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
||
|
char *page)
|
||
|
{
|
||
|
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
|
||
|
}
|
||
|
|
||
|
ssize_t core_alua_store_implicit_trans_secs(
|
||
|
struct t10_alua_tg_pt_gp *tg_pt_gp,
|
||
|
const char *page,
|
||
|
size_t count)
|
||
|
{
|
||
|
unsigned long tmp;
|
||
|
int ret;
|
||
|
|
||
|
ret = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract implicit_trans_secs\n");
|
||
|
return ret;
|
||
|
}
|
||
|
if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
|
||
|
pr_err("Passed implicit_trans_secs: %lu, exceeds"
|
||
|
" ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
|
||
|
ALUA_MAX_IMPLICIT_TRANS_SECS);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
tg_pt_gp->tg_pt_gp_implicit_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 = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract preferred ALUA value\n");
|
||
|
return ret;
|
||
|
}
|
||
|
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)
|
||
|
{
|
||
|
return sprintf(page, "%d\n",
|
||
|
atomic_read(&lun->lun_tg_pt_secondary_offline));
|
||
|
}
|
||
|
|
||
|
ssize_t core_alua_store_offline_bit(
|
||
|
struct se_lun *lun,
|
||
|
const char *page,
|
||
|
size_t count)
|
||
|
{
|
||
|
/*
|
||
|
* rcu_dereference_raw protected by se_lun->lun_group symlink
|
||
|
* reference to se_device->dev_group.
|
||
|
*/
|
||
|
struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
|
||
|
unsigned long tmp;
|
||
|
int ret;
|
||
|
|
||
|
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
|
||
|
(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
|
||
|
return -ENODEV;
|
||
|
|
||
|
ret = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract alua_tg_pt_offline value\n");
|
||
|
return ret;
|
||
|
}
|
||
|
if ((tmp != 0) && (tmp != 1)) {
|
||
|
pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
|
||
|
tmp);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ret = core_alua_set_tg_pt_secondary_state(lun, 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_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 = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract alua_tg_pt_status\n");
|
||
|
return ret;
|
||
|
}
|
||
|
if ((tmp != ALUA_STATUS_NONE) &&
|
||
|
(tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
|
||
|
(tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
|
||
|
pr_err("Illegal value for alua_tg_pt_status: %lu\n",
|
||
|
tmp);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
lun->lun_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_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 = kstrtoul(page, 0, &tmp);
|
||
|
if (ret < 0) {
|
||
|
pr_err("Unable to extract alua_tg_pt_write_md\n");
|
||
|
return ret;
|
||
|
}
|
||
|
if ((tmp != 0) && (tmp != 1)) {
|
||
|
pr_err("Illegal value for alua_tg_pt_write_md:"
|
||
|
" %lu\n", tmp);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
lun->lun_tg_pt_secondary_write_md = (int)tmp;
|
||
|
|
||
|
return count;
|
||
|
}
|
||
|
|
||
|
int core_setup_alua(struct se_device *dev)
|
||
|
{
|
||
|
if (!(dev->transport->transport_flags &
|
||
|
TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
|
||
|
!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
|
||
|
struct t10_alua_lu_gp_member *lu_gp_mem;
|
||
|
|
||
|
/*
|
||
|
* 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);
|
||
|
|
||
|
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);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|