diff options
Diffstat (limited to 'drivers/target/target_core_alua.c')
| -rw-r--r-- | drivers/target/target_core_alua.c | 2416 |
1 files changed, 2416 insertions, 0 deletions
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c new file mode 100644 index 00000000000..fbc5ebb5f76 --- /dev/null +++ b/drivers/target/target_core_alua.c @@ -0,0 +1,2416 @@ +/******************************************************************************* + * 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/export.h> +#include <linux/file.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.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/target_core_configfs.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); +static int core_alua_set_tg_pt_secondary_state( + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, + struct se_port *port, int explicit, int offline); + +static char *core_alua_dump_state(int state); + +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 se_port *port; + struct t10_alua_tg_pt_gp *tg_pt_gp; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + 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(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, + tg_pt_gp_mem_list) { + port = tg_pt_gp_mem->tg_pt; + /* + * 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++] = ((port->sep_rtpi >> 8) & 0xff); + buf[off++] = (port->sep_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. + */ + port = cmd->se_lun->lun_sep; + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + if (tg_pt_gp_mem) { + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + if (tg_pt_gp) + buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs; + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_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_port *port, *l_port = cmd->se_lun->lun_sep; + 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; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; + 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 (!l_port) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + 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. + */ + l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; + if (!l_tg_pt_gp_mem) { + pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); + rc = TCM_UNSUPPORTED_SCSI_OPCODE; + goto out; + } + spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); + l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; + if (!l_tg_pt_gp) { + spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); + pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); + rc = TCM_UNSUPPORTED_SCSI_OPCODE; + goto out; + } + spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); + + if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) { + 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; + + 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); + 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(&tg_pt_gp->tg_pt_gp_ref_cnt); + smp_mb__after_atomic(); + + spin_unlock(&dev->t10_alua.tg_pt_gps_lock); + + if (!core_alua_do_port_transition(tg_pt_gp, + dev, l_port, nacl, + alua_access_state, 1)) + found = true; + + spin_lock(&dev->t10_alua.tg_pt_gps_lock); + atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); + smp_mb__after_atomic(); + break; + } + spin_unlock(&dev->t10_alua.tg_pt_gps_lock); + } else { + /* + * 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(port, &dev->dev_sep_list, + sep_list) { + if (port->sep_rtpi != rtpi) + continue; + + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + + spin_unlock(&dev->se_port_lock); + + if (!core_alua_set_tg_pt_secondary_state( + tg_pt_gp_mem, port, 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: + 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 se_port *port = lun->lun_sep; + struct t10_alua_tg_pt_gp *tg_pt_gp; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + int out_alua_state, nonop_delay_msecs; + + if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) + return 0; + if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) + return 0; + + if (!port) + return 0; + /* + * First, check for a struct se_port specific secondary ALUA target port + * access state: OFFLINE + */ + if (atomic_read(&port->sep_tg_pt_secondary_offline)) { + 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; + } + /* + * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the + * ALUA target port group, to obtain current ALUA access state. + * Otherwise look for the underlying struct se_device association with + * a ALUA logical unit group. + */ + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + if (!tg_pt_gp_mem) + return 0; + + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); + nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + /* + * Process ALUA_ACCESS_STATE_ACTIVE_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_port->sep_tg_pt_secondary_offline=1 + */ + case ALUA_ACCESS_STATE_OFFLINE: + default: + pr_err("Unknown ALUA access state: 0x%02x\n", + out_alua_state); + return 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) +{ + /* + * 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: + /* + * Transitioning is set internally, and + * cannot be selected manually. + */ + goto not_supported; + 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); + +/* + * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex + * + */ +static int core_alua_write_tpg_metadata( + const char *path, + unsigned char *md_buf, + u32 md_buf_len) +{ + 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, + "/var/target/alua/tpgs_%s/%s", &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_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.work); + struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; + struct se_dev_entry *se_deve; + struct se_lun_acl *lacl; + struct se_port *port; + struct t10_alua_tg_pt_gp_member *mem; + bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status == + ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG); + + spin_lock(&tg_pt_gp->tg_pt_gp_lock); + list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, + tg_pt_gp_mem_list) { + port = mem->tg_pt; + /* + * After an implicit target port asymmetric access state + * change, a device server shall establish a unit attention + * condition for the initiator port associated with every I_T + * nexus with the additional sense code set to ASYMMETRIC + * ACCESS STATE 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 + */ + atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); + smp_mb__after_atomic(); + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); + + spin_lock_bh(&port->sep_alua_lock); + list_for_each_entry(se_deve, &port->sep_alua_list, + alua_port_list) { + lacl = se_deve->se_lun_acl; + /* + * se_deve->se_lun_acl pointer may be NULL for a + * entry created without explicit Node+MappedLUN ACLs + */ + if (!lacl) + continue; + + if ((tg_pt_gp->tg_pt_gp_alua_access_status == + ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && + (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && + (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) && + (tg_pt_gp->tg_pt_gp_alua_port != NULL) && + (tg_pt_gp->tg_pt_gp_alua_port == port)) + continue; + + core_scsi3_ua_allocate(lacl->se_lun_nacl, + se_deve->mapped_lun, 0x2A, + ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); + } + spin_unlock_bh(&port->sep_alua_lock); + + spin_lock(&tg_pt_gp->tg_pt_gp_lock); + atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); + smp_mb__after_atomic(); + } + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); + /* + * Update the ALUA metadata buf that has been allocated in + * core_alua_do_port_transition(), this metadata will be written + * to struct file. + * + * Note that there is the case where we do not want to update the + * metadata when the saved metadata is being parsed in userspace + * when setting the existing port access state and access status. + * + * Also note that the failure to write out the ALUA metadata to + * struct file does NOT affect the actual ALUA transition. + */ + if (tg_pt_gp->tg_pt_gp_write_metadata) { + mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); + core_alua_update_tpg_primary_metadata(tg_pt_gp); + 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)); + spin_lock(&dev->t10_alua.tg_pt_gps_lock); + atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); + smp_mb__after_atomic(); + 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 (new_state == ALUA_ACCESS_STATE_TRANSITION) + return -EAGAIN; + + /* + * Flush any pending transitions + */ + if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs && + atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == + ALUA_ACCESS_STATE_TRANSITION) { + /* Just in case */ + tg_pt_gp->tg_pt_gp_alua_pending_state = new_state; + tg_pt_gp->tg_pt_gp_transition_complete = &wait; + flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work); + wait_for_completion(&wait); + tg_pt_gp->tg_pt_gp_transition_complete = NULL; + return 0; + } + + /* + * Save the old primary ALUA access state, and set the current state + * to ALUA_ACCESS_STATE_TRANSITION. + */ + 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; + + 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; + + /* + * 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); + smp_mb__after_atomic(); + spin_unlock(&dev->t10_alua.tg_pt_gps_lock); + + if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) { + unsigned long transition_tmo; + + transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ; + queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, + &tg_pt_gp->tg_pt_gp_transition_work, + transition_tmo); + } else { + tg_pt_gp->tg_pt_gp_transition_complete = &wait; + queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq, + &tg_pt_gp->tg_pt_gp_transition_work, 0); + 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_port *l_port, + 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; + + valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; + if (core_alua_check_transition(new_state, valid_states, &primary) != 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); + smp_mb__after_atomic(); + 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_port = l_port; + 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(&lu_gp->lu_gp_ref_cnt); + smp_mb__after_atomic(); + 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(&lu_gp_mem->lu_gp_mem_ref_cnt); + smp_mb__after_atomic(); + 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_port = l_port; + tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; + } else { + tg_pt_gp->tg_pt_gp_alua_port = NULL; + tg_pt_gp->tg_pt_gp_alua_nacl = NULL; + } + atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); + smp_mb__after_atomic(); + 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(&tg_pt_gp->tg_pt_gp_ref_cnt); + smp_mb__after_atomic(); + if (rc) + break; + } + spin_unlock(&dev->t10_alua.tg_pt_gps_lock); + + spin_lock(&lu_gp->lu_gp_lock); + atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); + smp_mb__after_atomic(); + } + 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(&lu_gp->lu_gp_ref_cnt); + smp_mb__after_atomic(); + return rc; +} + +/* + * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held + */ +static int core_alua_update_tpg_secondary_metadata( + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, + struct se_port *port) +{ + unsigned char *md_buf; + struct se_portal_group *se_tpg = port->sep_tpg; + char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_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); + 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(&port->sep_tg_pt_secondary_offline), + port->sep_tg_pt_secondary_stat); + + snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", + se_tpg->se_tpg_tfo->get_fabric_name(), wwn, + port->sep_lun->unpacked_lun); + + rc = core_alua_write_tpg_metadata(path, md_buf, len); + kfree(md_buf); + + return rc; +} + +static int core_alua_set_tg_pt_secondary_state( + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, + struct se_port *port, + int explicit, + int offline) +{ + struct t10_alua_tg_pt_gp *tg_pt_gp; + int trans_delay_msecs; + + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + if (!tg_pt_gp) { + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + pr_err("Unable to complete secondary state" + " transition\n"); + return -EINVAL; + } + trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; + /* + * Set the secondary ALUA target port access state to OFFLINE + * or release the previously secondary state for struct se_port + */ + if (offline) + atomic_set(&port->sep_tg_pt_secondary_offline, 1); + else + atomic_set(&port->sep_tg_pt_secondary_offline, 0); + + port->sep_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(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + /* + * Do the optional transition delay after we set the secondary + * ALUA access state. + */ + if (trans_delay_msecs != 0) + msleep_interruptible(trans_delay_msecs); + /* + * See if we need to update the ALUA fabric port metadata for + * secondary state and status + */ + if (port->sep_tg_pt_secondary_write_md) { + mutex_lock(&port->sep_tg_pt_md_mutex); + core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port); + mutex_unlock(&port->sep_tg_pt_md_mutex); + } + + 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_mem_list); + mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); + spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); + atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); + INIT_DELAYED_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; +} + +struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( + struct se_port *port) +{ + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + + tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, + GFP_KERNEL); + if (!tg_pt_gp_mem) { + pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); + return ERR_PTR(-ENOMEM); + } + INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); + spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); + + tg_pt_gp_mem->tg_pt = port; + port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; + + return tg_pt_gp_mem; +} + +void core_alua_free_tg_pt_gp( + struct t10_alua_tg_pt_gp *tg_pt_gp) +{ + struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; + + /* + * Once we have reached this point, config_item_put() has already + * been called from target_core_alua_drop_tg_pt_gp(). + * + * Here we remove *tg_pt_gp from the global list so that + * no 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_delayed_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(tg_pt_gp_mem, tg_pt_gp_mem_tmp, + &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { + if (tg_pt_gp_mem->tg_pt_gp_assoc) { + list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); + tg_pt_gp->tg_pt_gp_members--; + tg_pt_gp_mem->tg_pt_gp_assoc = 0; + } + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); + /* + * tg_pt_gp_mem is associated with a single + * se_port->sep_alua_tg_pt_gp_mem, and is released via + * core_alua_free_tg_pt_gp_mem(). + * + * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, + * assume we want to re-associate a given tg_pt_gp_mem with + * default_tg_pt_gp. + */ + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { + __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, + dev->t10_alua.default_tg_pt_gp); + } else + tg_pt_gp_mem->tg_pt_gp = NULL; + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + + spin_lock(&tg_pt_gp->tg_pt_gp_lock); + } + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); + + kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); +} + +void core_alua_free_tg_pt_gp_mem(struct se_port *port) +{ + struct t10_alua_tg_pt_gp *tg_pt_gp; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + if (!tg_pt_gp_mem) + return; + + while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) + cpu_relax(); + + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + if (tg_pt_gp) { + spin_lock(&tg_pt_gp->tg_pt_gp_lock); + if (tg_pt_gp_mem->tg_pt_gp_assoc) { + list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); + tg_pt_gp->tg_pt_gp_members--; + tg_pt_gp_mem->tg_pt_gp_assoc = 0; + } + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); + tg_pt_gp_mem->tg_pt_gp = NULL; + } + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + + kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); +} + +static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( + struct se_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); +} + +/* + * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held + */ +void __core_alua_attach_tg_pt_gp_mem( + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, + struct t10_alua_tg_pt_gp *tg_pt_gp) +{ + spin_lock(&tg_pt_gp->tg_pt_gp_lock); + tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; + tg_pt_gp_mem->tg_pt_gp_assoc = 1; + list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, + &tg_pt_gp->tg_pt_gp_mem_list); + tg_pt_gp->tg_pt_gp_members++; + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); +} + +/* + * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held + */ +static void __core_alua_drop_tg_pt_gp_mem( + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, + struct t10_alua_tg_pt_gp *tg_pt_gp) +{ + spin_lock(&tg_pt_gp->tg_pt_gp_lock); + list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); + tg_pt_gp_mem->tg_pt_gp = NULL; + tg_pt_gp_mem->tg_pt_gp_assoc = 0; + tg_pt_gp->tg_pt_gp_members--; + spin_unlock(&tg_pt_gp->tg_pt_gp_lock); +} + +ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) +{ + struct config_item *tg_pt_ci; + struct t10_alua_tg_pt_gp *tg_pt_gp; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + ssize_t len = 0; + + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + if (!tg_pt_gp_mem) + return len; + + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + if (tg_pt_gp) { + tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; + len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" + " %hu\nTG Port Primary Access State: %s\nTG Port " + "Primary Access Status: %s\nTG Port Secondary Access" + " State: %s\nTG Port Secondary Access Status: %s\n", + config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, + core_alua_dump_state(atomic_read( + &tg_pt_gp->tg_pt_gp_alua_access_state)), + core_alua_dump_status( + tg_pt_gp->tg_pt_gp_alua_access_status), + (atomic_read(&port->sep_tg_pt_secondary_offline)) ? + "Offline" : "None", + core_alua_dump_status(port->sep_tg_pt_secondary_stat)); + } + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + + return len; +} + +ssize_t core_alua_store_tg_pt_gp_info( + struct se_port *port, + const char *page, + size_t count) +{ + struct se_portal_group *tpg; + struct se_lun *lun; + struct se_device *dev = port->sep_lun->lun_se_dev; + struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + unsigned char buf[TG_PT_GROUP_NAME_BUF]; + int move = 0; + + tpg = port->sep_tpg; + lun = port->sep_lun; + + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; + if (!tg_pt_gp_mem) + return 0; + + 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(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; + if (tg_pt_gp) { + /* + * Clearing an existing tg_pt_gp association, and replacing + * with the default_tg_pt_gp. + */ + if (!tg_pt_gp_new) { + pr_debug("Target_Core_ConfigFS: Moving" + " %s/tpgt_%hu/%s from ALUA Target Port Group:" + " alua/%s, ID: %hu back to" + " default_tg_pt_gp\n", + tpg->se_tpg_tfo->tpg_get_wwn(tpg), + tpg->se_tpg_tfo->tpg_get_tag(tpg), + config_item_name(&lun->lun_group.cg_item), + config_item_name( + &tg_pt_gp->tg_pt_gp_group.cg_item), + tg_pt_gp->tg_pt_gp_id); + + __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); + __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, + dev->t10_alua.default_tg_pt_gp); + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + + return count; + } + /* + * Removing existing association of tg_pt_gp_mem with tg_pt_gp + */ + __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); + move = 1; + } + /* + * Associate tg_pt_gp_mem with tg_pt_gp_new. + */ + __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); + pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" + " Target Port Group: alua/%s, ID: %hu\n", (move) ? + "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), + tpg->se_tpg_tfo->tpg_get_tag(tpg), + config_item_name(&lun->lun_group.cg_item), + config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), + tg_pt_gp_new->tg_pt_gp_id); + + core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); + return count; +} + +ssize_t core_alua_show_access_type( + struct t10_alua_tg_pt_gp *tg_pt_gp, + char *page) +{ + if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_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) +{ + if (!lun->lun_sep) + return -ENODEV; + + return sprintf(page, "%d\n", + atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); +} + +ssize_t core_alua_store_offline_bit( + struct se_lun *lun, + const char *page, + size_t count) +{ + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; + unsigned long tmp; + int ret; + + if (!lun->lun_sep) + return -ENODEV; + + ret = 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; + } + tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; + if (!tg_pt_gp_mem) { + pr_err("Unable to locate *tg_pt_gp_mem\n"); + return -EINVAL; + } + + ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, + lun->lun_sep, 0, (int)tmp); + if (ret < 0) + return -EINVAL; + + return count; +} + +ssize_t core_alua_show_secondary_status( + struct se_lun *lun, + char *page) +{ + return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); +} + +ssize_t core_alua_store_secondary_status( + struct se_lun *lun, + const char *page, + size_t count) +{ + unsigned long tmp; + int ret; + + ret = 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_sep->sep_tg_pt_secondary_stat = (int)tmp; + + return count; +} + +ssize_t core_alua_show_secondary_write_metadata( + struct se_lun *lun, + char *page) +{ + return sprintf(page, "%d\n", + lun->lun_sep->sep_tg_pt_secondary_write_md); +} + +ssize_t core_alua_store_secondary_write_metadata( + struct se_lun *lun, + const char *page, + size_t count) +{ + unsigned long tmp; + int ret; + + ret = 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_sep->sep_tg_pt_secondary_write_md = (int)tmp; + + return count; +} + +int core_setup_alua(struct se_device *dev) +{ + if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && + !(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; +} |