| /******************************************************************************* |
| * Filename: target_core_alua.c |
| * |
| * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) |
| * |
| * (c) Copyright 2009-2013 Datera, Inc. |
| * |
| * Nicholas A. Bellinger <nab@kernel.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| ******************************************************************************/ |
| |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/configfs.h> |
| #include <linux/delay.h> |
| #include <linux/export.h> |
| #include <linux/fcntl.h> |
| #include <linux/file.h> |
| #include <linux/fs.h> |
| #include <scsi/scsi_proto.h> |
| #include <asm/unaligned.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| #include <target/target_core_fabric.h> |
| |
| #include "target_core_internal.h" |
| #include "target_core_alua.h" |
| #include "target_core_ua.h" |
| |
| static sense_reason_t core_alua_check_transition(int state, int valid, |
| int *primary, int explicit); |
| static int core_alua_set_tg_pt_secondary_state( |
| struct se_lun *lun, int explicit, int offline); |
| |
| static char *core_alua_dump_state(int state); |
| |
| static void __target_attach_tg_pt_gp(struct se_lun *lun, |
| struct t10_alua_tg_pt_gp *tg_pt_gp); |
| |
| static u16 alua_lu_gps_counter; |
| static u32 alua_lu_gps_count; |
| |
| static DEFINE_SPINLOCK(lu_gps_lock); |
| static LIST_HEAD(lu_gps_list); |
| |
| struct t10_alua_lu_gp *default_lu_gp; |
| |
| /* |
| * REPORT REFERRALS |
| * |
| * See sbc3r35 section 5.23 |
| */ |
| sense_reason_t |
| target_emulate_report_referrals(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct t10_alua_lba_map *map; |
| struct t10_alua_lba_map_member *map_mem; |
| unsigned char *buf; |
| u32 rd_len = 0, off; |
| |
| if (cmd->data_length < 4) { |
| pr_warn("REPORT REFERRALS allocation length %u too" |
| " small\n", cmd->data_length); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| |
| buf = transport_kmap_data_sg(cmd); |
| if (!buf) |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| |
| off = 4; |
| spin_lock(&dev->t10_alua.lba_map_lock); |
| if (list_empty(&dev->t10_alua.lba_map_list)) { |
| spin_unlock(&dev->t10_alua.lba_map_lock); |
| transport_kunmap_data_sg(cmd); |
| |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| } |
| |
| list_for_each_entry(map, &dev->t10_alua.lba_map_list, |
| lba_map_list) { |
| int desc_num = off + 3; |
| int pg_num; |
| |
| off += 4; |
| if (cmd->data_length > off) |
| put_unaligned_be64(map->lba_map_first_lba, &buf[off]); |
| off += 8; |
| if (cmd->data_length > off) |
| put_unaligned_be64(map->lba_map_last_lba, &buf[off]); |
| off += 8; |
| rd_len += 20; |
| pg_num = 0; |
| list_for_each_entry(map_mem, &map->lba_map_mem_list, |
| lba_map_mem_list) { |
| int alua_state = map_mem->lba_map_mem_alua_state; |
| int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; |
| |
| if (cmd->data_length > off) |
| buf[off] = alua_state & 0x0f; |
| off += 2; |
| if (cmd->data_length > off) |
| buf[off] = (alua_pg_id >> 8) & 0xff; |
| off++; |
| if (cmd->data_length > off) |
| buf[off] = (alua_pg_id & 0xff); |
| off++; |
| rd_len += 4; |
| pg_num++; |
| } |
| if (cmd->data_length > desc_num) |
| buf[desc_num] = pg_num; |
| } |
| spin_unlock(&dev->t10_alua.lba_map_lock); |
| |
| /* |
| * Set the RETURN DATA LENGTH set in the header of the DataIN Payload |
| */ |
| put_unaligned_be16(rd_len, &buf[2]); |
| |
| transport_kunmap_data_sg(cmd); |
| |
| target_complete_cmd(cmd, GOOD); |
| return 0; |
| } |
| |
| /* |
| * REPORT_TARGET_PORT_GROUPS |
| * |
| * See spc4r17 section 6.27 |
| */ |
| sense_reason_t |
| target_emulate_report_target_port_groups(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| struct se_lun *lun; |
| unsigned char *buf; |
| u32 rd_len = 0, off; |
| int ext_hdr = (cmd->t_task_cdb[1] & 0x20); |
| |
| /* |
| * Skip over RESERVED area to first Target port group descriptor |
| * depending on the PARAMETER DATA FORMAT type.. |
| */ |
| if (ext_hdr != 0) |
| off = 8; |
| else |
| off = 4; |
| |
| if (cmd->data_length < off) { |
| pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" |
| " small for %s header\n", cmd->data_length, |
| (ext_hdr) ? "extended" : "normal"); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| buf = transport_kmap_data_sg(cmd); |
| if (!buf) |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| |
| 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) { |
| /* |
| * Check if the Target port group and Target port descriptor list |
| * based on tg_pt_gp_members count will fit into the response payload. |
| * Otherwise, bump rd_len to let the initiator know we have exceeded |
| * the allocation length and the response is truncated. |
| */ |
| if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > |
| cmd->data_length) { |
| rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); |
| continue; |
| } |
| /* |
| * PREF: Preferred target port bit, determine if this |
| * bit should be set for port group. |
| */ |
| if (tg_pt_gp->tg_pt_gp_pref) |
| buf[off] = 0x80; |
| /* |
| * Set the ASYMMETRIC ACCESS State |
| */ |
| buf[off++] |= (atomic_read( |
| &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); |
| /* |
| * Set supported ASYMMETRIC ACCESS State bits |
| */ |
| buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states; |
| /* |
| * TARGET PORT GROUP |
| */ |
| buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); |
| buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); |
| |
| off++; /* Skip over Reserved */ |
| /* |
| * STATUS CODE |
| */ |
| buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); |
| /* |
| * Vendor Specific field |
| */ |
| buf[off++] = 0x00; |
| /* |
| * TARGET PORT COUNT |
| */ |
| buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); |
| rd_len += 8; |
| |
| 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) { |
| /* |
| * Start Target Port descriptor format |
| * |
| * See spc4r17 section 6.2.7 Table 247 |
| */ |
| off += 2; /* Skip over Obsolete */ |
| /* |
| * Set RELATIVE TARGET PORT IDENTIFIER |
| */ |
| buf[off++] = ((lun->lun_rtpi >> 8) & 0xff); |
| buf[off++] = (lun->lun_rtpi & 0xff); |
| rd_len += 4; |
| } |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| } |
| spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
| /* |
| * Set the RETURN DATA LENGTH set in the header of the DataIN Payload |
| */ |
| put_unaligned_be32(rd_len, &buf[0]); |
| |
| /* |
| * Fill in the Extended header parameter data format if requested |
| */ |
| if (ext_hdr != 0) { |
| buf[4] = 0x10; |
| /* |
| * Set the implicit transition time (in seconds) for the application |
| * client to use as a base for it's transition timeout value. |
| * |
| * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN |
| * this CDB was received upon to determine this value individually |
| * for ALUA target port group. |
| */ |
| spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock); |
| tg_pt_gp = cmd->se_lun->lun_tg_pt_gp; |
| if (tg_pt_gp) |
| buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; |
| spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock); |
| } |
| transport_kunmap_data_sg(cmd); |
| |
| target_complete_cmd(cmd, GOOD); |
| return 0; |
| } |
| |
| /* |
| * SET_TARGET_PORT_GROUPS for explicit ALUA operation. |
| * |
| * See spc4r17 section 6.35 |
| */ |
| sense_reason_t |
| target_emulate_set_target_port_groups(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct se_lun *l_lun = cmd->se_lun; |
| struct se_node_acl *nacl = cmd->se_sess->se_node_acl; |
| struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
| unsigned char *buf; |
| unsigned char *ptr; |
| sense_reason_t rc = TCM_NO_SENSE; |
| u32 len = 4; /* Skip over RESERVED area in header */ |
| int alua_access_state, primary = 0, valid_states; |
| u16 tg_pt_id, rtpi; |
| |
| if (cmd->data_length < 4) { |
| pr_warn("SET TARGET PORT GROUPS parameter list length %u too" |
| " small\n", cmd->data_length); |
| return TCM_INVALID_PARAMETER_LIST; |
| } |
| |
| buf = transport_kmap_data_sg(cmd); |
| if (!buf) |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| |
| /* |
| * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed |
| * for the local tg_pt_gp. |
| */ |
| spin_lock(&l_lun->lun_tg_pt_gp_lock); |
| l_tg_pt_gp = l_lun->lun_tg_pt_gp; |
| if (!l_tg_pt_gp) { |
| spin_unlock(&l_lun->lun_tg_pt_gp_lock); |
| pr_err("Unable to access l_lun->tg_pt_gp\n"); |
| rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
| goto out; |
| } |
| |
| if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { |
| spin_unlock(&l_lun->lun_tg_pt_gp_lock); |
| pr_debug("Unable to process SET_TARGET_PORT_GROUPS" |
| " while TPGS_EXPLICIT_ALUA is disabled\n"); |
| rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
| goto out; |
| } |
| valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; |
| spin_unlock(&l_lun->lun_tg_pt_gp_lock); |
| |
| ptr = &buf[4]; /* Skip over RESERVED area in header */ |
| |
| while (len < cmd->data_length) { |
| bool found = false; |
| alua_access_state = (ptr[0] & 0x0f); |
| /* |
| * Check the received ALUA access state, and determine if |
| * the state is a primary or secondary target port asymmetric |
| * access state. |
| */ |
| rc = core_alua_check_transition(alua_access_state, valid_states, |
| &primary, 1); |
| if (rc) { |
| /* |
| * If the SET TARGET PORT GROUPS attempts to establish |
| * an invalid combination of target port asymmetric |
| * access states or attempts to establish an |
| * unsupported target port asymmetric access state, |
| * then the command shall be terminated with CHECK |
| * CONDITION status, with the sense key set to ILLEGAL |
| * REQUEST, and the additional sense code set to INVALID |
| * FIELD IN PARAMETER LIST. |
| */ |
| goto out; |
| } |
| |
| /* |
| * If the ASYMMETRIC ACCESS STATE field (see table 267) |
| * specifies a primary target port asymmetric access state, |
| * then the TARGET PORT GROUP OR TARGET PORT field specifies |
| * a primary target port group for which the primary target |
| * port asymmetric access state shall be changed. If the |
| * ASYMMETRIC ACCESS STATE field specifies a secondary target |
| * port asymmetric access state, then the TARGET PORT GROUP OR |
| * TARGET PORT field specifies the relative target port |
| * identifier (see 3.1.120) of the target port for which the |
| * secondary target port asymmetric access state shall be |
| * changed. |
| */ |
| if (primary) { |
| tg_pt_id = get_unaligned_be16(ptr + 2); |
| /* |
| * Locate the matching target port group ID from |
| * the global tg_pt_gp list |
| */ |
| 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 (tg_pt_id != tg_pt_gp->tg_pt_gp_id) |
| continue; |
| |
| atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| |
| spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
| |
| if (!core_alua_do_port_transition(tg_pt_gp, |
| dev, l_lun, nacl, |
| alua_access_state, 1)) |
| found = true; |
| |
| spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
| atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| break; |
| } |
| spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
| } else { |
| 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->get_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 = atomic_read(&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); |
| 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, 0); |
| if (ret < 0) |
| pr_err("Error writing ALUA metadata file: %s\n", path); |
| fput(file); |
| return (ret < 0) ? -EIO : 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) |
| { |
| unsigned char *md_buf; |
| struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; |
| char path[ALUA_METADATA_PATH_LEN]; |
| int len, rc; |
| |
| md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); |
| if (!md_buf) { |
| pr_err("Unable to allocate buf for ALUA metadata\n"); |
| return -ENOMEM; |
| } |
| |
| memset(path, 0, ALUA_METADATA_PATH_LEN); |
| |
| 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_pending_state, |
| tg_pt_gp->tg_pt_gp_alua_access_status); |
| |
| snprintf(path, ALUA_METADATA_PATH_LEN, |
| "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0], |
| config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); |
| |
| rc = core_alua_write_tpg_metadata(path, md_buf, len); |
| 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 void core_alua_do_transition_tg_pt_work(struct work_struct *work) |
| { |
| struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work, |
| struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work); |
| struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
| bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == |
| ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); |
| |
| /* |
| * 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); |
| 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, |
| tg_pt_gp->tg_pt_gp_alua_pending_state); |
| |
| 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(tg_pt_gp->tg_pt_gp_alua_previous_state), |
| core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state)); |
| |
| core_alua_queue_state_change_ua(tg_pt_gp); |
| |
| 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); |
| |
| if (tg_pt_gp->tg_pt_gp_transition_complete) |
| complete(tg_pt_gp->tg_pt_gp_transition_complete); |
| } |
| |
| static int core_alua_do_transition_tg_pt( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| int new_state, |
| int explicit) |
| { |
| struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
| DECLARE_COMPLETION_ONSTACK(wait); |
| |
| /* Nothing to be done here */ |
| if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state) |
| return 0; |
| |
| if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) |
| return -EAGAIN; |
| |
| /* |
| * Flush any pending transitions |
| */ |
| if (!explicit) |
| flush_work(&tg_pt_gp->tg_pt_gp_transition_work); |
| |
| /* |
| * Save the old primary ALUA access state, and set the current state |
| * to ALUA_ACCESS_STATE_TRANSITION. |
| */ |
| atomic_set(&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) |
| return 0; |
| |
| tg_pt_gp->tg_pt_gp_alua_previous_state = |
| atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; |
| |
| /* |
| * 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); |
| |
| /* |
| * Take a reference for workqueue item |
| */ |
| spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
| atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
| |
| schedule_work(&tg_pt_gp->tg_pt_gp_transition_work); |
| if (explicit) { |
| tg_pt_gp->tg_pt_gp_transition_complete = &wait; |
| wait_for_completion(&wait); |
| tg_pt_gp->tg_pt_gp_transition_complete = NULL; |
| } |
| |
| 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[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; |
| 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; |
| } |
| |
| 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, 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); |
| |
| snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu", |
| db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
| lun->unpacked_lun); |
| |
| rc = core_alua_write_tpg_metadata(path, md_buf, len); |
| 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_md_mutex); |
| spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); |
| atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); |
| INIT_WORK(&tg_pt_gp->tg_pt_gp_transition_work, |
| core_alua_do_transition_tg_pt_work); |
| tg_pt_gp->tg_pt_gp_dev = dev; |
| atomic_set(&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); |
| list_del(&tg_pt_gp->tg_pt_gp_list); |
| dev->t10_alua.alua_tg_pt_gps_counter--; |
| spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
| |
| flush_work(&tg_pt_gp->tg_pt_gp_transition_work); |
| |
| /* |
| * 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(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(&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; |
| } |