// SPDX-License-Identifier: GPL-2.0-or-later /******************************************************************************* * 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 * ******************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #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, SAM_STAT_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++] |= 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 */ put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]); off += 2; 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 */ put_unaligned_be16(lun->lun_rtpi, &buf[off]); off += 2; 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_with_length(cmd, SAM_STAT_GOOD, rd_len + 4); 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, SAM_STAT_GOOD); return rc; } 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 sense_reason_t core_alua_state_lba_dependent( struct se_cmd *cmd, u16 tg_pt_gp_id) { 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); return TCM_ALUA_TG_PT_UNAVAILABLE; } 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_id) continue; switch(map_mem->lba_map_mem_alua_state) { case ALUA_ACCESS_STATE_STANDBY: spin_unlock(&dev->t10_alua.lba_map_lock); return TCM_ALUA_TG_PT_STANDBY; case ALUA_ACCESS_STATE_UNAVAILABLE: spin_unlock(&dev->t10_alua.lba_map_lock); return TCM_ALUA_TG_PT_UNAVAILABLE; default: break; } } } spin_unlock(&dev->t10_alua.lba_map_lock); return 0; } static inline sense_reason_t 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: return TCM_ALUA_TG_PT_STANDBY; } case MAINTENANCE_IN: switch (cdb[1] & 0x1f) { case MI_REPORT_TARGET_PGS: return 0; default: return TCM_ALUA_TG_PT_STANDBY; } case MAINTENANCE_OUT: switch (cdb[1]) { case MO_SET_TARGET_PGS: return 0; default: return TCM_ALUA_TG_PT_STANDBY; } case REQUEST_SENSE: case PERSISTENT_RESERVE_IN: case PERSISTENT_RESERVE_OUT: case READ_BUFFER: case WRITE_BUFFER: return 0; default: return TCM_ALUA_TG_PT_STANDBY; } return 0; } static inline sense_reason_t 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: return TCM_ALUA_TG_PT_UNAVAILABLE; } case MAINTENANCE_OUT: switch (cdb[1]) { case MO_SET_TARGET_PGS: return 0; default: return TCM_ALUA_TG_PT_UNAVAILABLE; } case REQUEST_SENSE: case READ_BUFFER: case WRITE_BUFFER: return 0; default: return TCM_ALUA_TG_PT_UNAVAILABLE; } return 0; } static inline sense_reason_t 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: return TCM_ALUA_STATE_TRANSITION; } case REQUEST_SENSE: case READ_BUFFER: case WRITE_BUFFER: return 0; default: return TCM_ALUA_STATE_TRANSITION; } 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; u16 tg_pt_gp_id; sense_reason_t rc = TCM_NO_SENSE; if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) return 0; if (dev->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"); return TCM_ALUA_OFFLINE; } if (!lun->lun_tg_pt_gp) return 0; spin_lock(&lun->lun_tg_pt_gp_lock); tg_pt_gp = lun->lun_tg_pt_gp; out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state; nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 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: rc = core_alua_state_standby(cmd, cdb); break; case ALUA_ACCESS_STATE_UNAVAILABLE: rc = core_alua_state_unavailable(cmd, cdb); break; case ALUA_ACCESS_STATE_TRANSITION: rc = core_alua_state_transition(cmd, cdb); break; case ALUA_ACCESS_STATE_LBA_DEPENDENT: rc = core_alua_state_lba_dependent(cmd, tg_pt_gp_id); 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); rc = TCM_INVALID_CDB_FIELD; } if (rc && rc != TCM_INVALID_CDB_FIELD) { pr_debug("[%s]: ALUA TG Port not available, " "SenseKey: NOT_READY, ASC/rc: 0x04/%d\n", cmd->se_tfo->fabric_name, rc); } return rc; } /* * 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; /* * The ALUA Active/NonOptimized access state delay can be disabled * in via configfs with a value of zero */ if (!cmd->alua_nonop_delay) return 0; /* * struct se_cmd->alua_nonop_delay gets set by a target port group * defined interval in core_alua_state_nonoptimized() */ msleep_interruptible(cmd->alua_nonop_delay); return 0; } EXPORT_SYMBOL(core_alua_check_nonop_delay); static int core_alua_write_tpg_metadata( const char *path, unsigned char *md_buf, u32 md_buf_len) { struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); loff_t pos = 0; int ret; if (IS_ERR(file)) { pr_err("filp_open(%s) for ALUA metadata failed\n", path); return -ENODEV; } ret = kernel_write(file, md_buf, md_buf_len, &pos); if (ret < 0) pr_err("Error writing ALUA metadata file: %s\n", path); fput(file); return (ret < 0) ? -EIO : 0; } static int core_alua_update_tpg_primary_metadata( struct t10_alua_tg_pt_gp *tg_pt_gp) { unsigned char *md_buf; struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; char *path; int len, rc; lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex); md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); if (!md_buf) { pr_err("Unable to allocate buf for ALUA metadata\n"); return -ENOMEM; } len = snprintf(md_buf, ALUA_MD_BUF_LEN, "tg_pt_gp_id=%hu\n" "alua_access_state=0x%02x\n" "alua_access_status=0x%02x\n", tg_pt_gp->tg_pt_gp_id, tg_pt_gp->tg_pt_gp_alua_access_state, tg_pt_gp->tg_pt_gp_alua_access_status); rc = -ENOMEM; path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0], config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); if (path) { rc = core_alua_write_tpg_metadata(path, md_buf, len); kfree(path); } kfree(md_buf); return rc; } static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp) { struct se_dev_entry *se_deve; struct se_lun *lun; struct se_lun_acl *lacl; spin_lock(&tg_pt_gp->tg_pt_gp_lock); list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { /* * After an implicit target port asymmetric access state * change, a device server shall establish a unit attention * condition for the initiator port associated with every I_T * nexus with the additional sense code set to ASYMMETRIC * ACCESS STATE CHANGED. * * After an explicit target port asymmetric access state * change, a device server shall establish a unit attention * condition with the additional sense code set to ASYMMETRIC * ACCESS STATE CHANGED for the initiator port associated with * every I_T nexus other than the I_T nexus on which the SET * TARGET PORT GROUPS command */ if (!percpu_ref_tryget_live(&lun->lun_ref)) continue; spin_unlock(&tg_pt_gp->tg_pt_gp_lock); spin_lock(&lun->lun_deve_lock); list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) { lacl = rcu_dereference_check(se_deve->se_lun_acl, lockdep_is_held(&lun->lun_deve_lock)); /* * spc4r37 p.242: * After an explicit target port asymmetric access * state change, a device server shall establish a * unit attention condition with the additional sense * code set to ASYMMETRIC ACCESS STATE CHANGED for * the initiator port associated with every I_T nexus * other than the I_T nexus on which the SET TARGET * PORT GROUPS command was received. */ if ((tg_pt_gp->tg_pt_gp_alua_access_status == ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) && (tg_pt_gp->tg_pt_gp_alua_lun != NULL) && (tg_pt_gp->tg_pt_gp_alua_lun == lun)) continue; /* * se_deve->se_lun_acl pointer may be NULL for a * entry created without explicit Node+MappedLUN ACLs */ if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) && (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl)) continue; core_scsi3_ua_allocate(se_deve, 0x2A, ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); } spin_unlock(&lun->lun_deve_lock); spin_lock(&tg_pt_gp->tg_pt_gp_lock); percpu_ref_put(&lun->lun_ref); } spin_unlock(&tg_pt_gp->tg_pt_gp_lock); } static int core_alua_do_transition_tg_pt( struct t10_alua_tg_pt_gp *tg_pt_gp, int new_state, int explicit) { int prev_state; mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex); /* Nothing to be done here */ if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) { mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); return 0; } if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) { mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); return -EAGAIN; } /* * Save the old primary ALUA access state, and set the current state * to ALUA_ACCESS_STATE_TRANSITION. */ prev_state = tg_pt_gp->tg_pt_gp_alua_access_state; tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION; tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ? ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; core_alua_queue_state_change_ua(tg_pt_gp); if (new_state == ALUA_ACCESS_STATE_TRANSITION) { mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); return 0; } /* * Check for the optional ALUA primary state transition delay */ if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); /* * Set the current primary ALUA access state to the requested new state */ tg_pt_gp->tg_pt_gp_alua_access_state = new_state; /* * Update the ALUA metadata buf that has been allocated in * core_alua_do_port_transition(), this metadata will be written * to struct file. * * Note that there is the case where we do not want to update the * metadata when the saved metadata is being parsed in userspace * when setting the existing port access state and access status. * * Also note that the failure to write out the ALUA metadata to * struct file does NOT affect the actual ALUA transition. */ if (tg_pt_gp->tg_pt_gp_write_metadata) { core_alua_update_tpg_primary_metadata(tg_pt_gp); } pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" " from primary access state %s to %s\n", (explicit) ? "explicit" : "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(prev_state), core_alua_dump_state(new_state)); core_alua_queue_state_change_ua(tg_pt_gp); mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex); return 0; } int core_alua_do_port_transition( struct t10_alua_tg_pt_gp *l_tg_pt_gp, struct se_device *l_dev, struct se_lun *l_lun, struct se_node_acl *l_nacl, int new_state, int explicit) { struct se_device *dev; struct t10_alua_lu_gp *lu_gp; struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; struct t10_alua_tg_pt_gp *tg_pt_gp; int primary, valid_states, rc = 0; if (l_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA) return -ENODEV; valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; if (core_alua_check_transition(new_state, valid_states, &primary, explicit) != 0) return -EINVAL; local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); lu_gp = local_lu_gp_mem->lu_gp; atomic_inc(&lu_gp->lu_gp_ref_cnt); spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); /* * For storage objects that are members of the 'default_lu_gp', * we only do transition on the passed *l_tp_pt_gp, and not * on all of the matching target port groups IDs in default_lu_gp. */ if (!lu_gp->lu_gp_id) { /* * core_alua_do_transition_tg_pt() will always return * success. */ l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun; l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; rc = core_alua_do_transition_tg_pt(l_tg_pt_gp, new_state, explicit); atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); return rc; } /* * For all other LU groups aside from 'default_lu_gp', walk all of * the associated storage objects looking for a matching target port * group ID from the local target port group. */ spin_lock(&lu_gp->lu_gp_lock); list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { dev = lu_gp_mem->lu_gp_mem_dev; atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); spin_unlock(&lu_gp->lu_gp_lock); spin_lock(&dev->t10_alua.tg_pt_gps_lock); list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, tg_pt_gp_list) { if (!tg_pt_gp->tg_pt_gp_valid_id) continue; /* * If the target behavior port asymmetric access state * is changed for any target port group accessible via * a logical unit within a LU group, the target port * behavior group asymmetric access states for the same * target port group accessible via other logical units * in that LU group will also change. */ if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) continue; if (l_tg_pt_gp == tg_pt_gp) { tg_pt_gp->tg_pt_gp_alua_lun = l_lun; tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl; } else { tg_pt_gp->tg_pt_gp_alua_lun = NULL; tg_pt_gp->tg_pt_gp_alua_nacl = NULL; } atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); spin_unlock(&dev->t10_alua.tg_pt_gps_lock); /* * core_alua_do_transition_tg_pt() will always return * success. */ rc = core_alua_do_transition_tg_pt(tg_pt_gp, new_state, explicit); spin_lock(&dev->t10_alua.tg_pt_gps_lock); atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt); if (rc) break; } spin_unlock(&dev->t10_alua.tg_pt_gps_lock); spin_lock(&lu_gp->lu_gp_lock); atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt); } spin_unlock(&lu_gp->lu_gp_lock); if (!rc) { pr_debug("Successfully processed LU Group: %s all ALUA TG PT" " Group IDs: %hu %s transition to primary state: %s\n", config_item_name(&lu_gp->lu_gp_group.cg_item), l_tg_pt_gp->tg_pt_gp_id, (explicit) ? "explicit" : "implicit", core_alua_dump_state(new_state)); } atomic_dec_mb(&lu_gp->lu_gp_ref_cnt); return rc; } static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun) { struct se_portal_group *se_tpg = lun->lun_tpg; unsigned char *md_buf; char *path; int len, rc; mutex_lock(&lun->lun_tg_pt_md_mutex); md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL); if (!md_buf) { pr_err("Unable to allocate buf for ALUA metadata\n"); rc = -ENOMEM; goto out_unlock; } len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n" "alua_tg_pt_status=0x%02x\n", atomic_read(&lun->lun_tg_pt_secondary_offline), lun->lun_tg_pt_secondary_stat); if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) { path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu", db_root, se_tpg->se_tpg_tfo->fabric_name, se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg), lun->unpacked_lun); } else { path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu", db_root, se_tpg->se_tpg_tfo->fabric_name, se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg), lun->unpacked_lun); } if (!path) { rc = -ENOMEM; goto out_free; } rc = core_alua_write_tpg_metadata(path, md_buf, len); kfree(path); out_free: kfree(md_buf); out_unlock: mutex_unlock(&lun->lun_tg_pt_md_mutex); return rc; } static int core_alua_set_tg_pt_secondary_state( struct se_lun *lun, int explicit, int offline) { struct t10_alua_tg_pt_gp *tg_pt_gp; int trans_delay_msecs; spin_lock(&lun->lun_tg_pt_gp_lock); tg_pt_gp = lun->lun_tg_pt_gp; if (!tg_pt_gp) { spin_unlock(&lun->lun_tg_pt_gp_lock); pr_err("Unable to complete secondary state" " transition\n"); return -EINVAL; } trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; /* * Set the secondary ALUA target port access state to OFFLINE * or release the previously secondary state for struct se_lun */ if (offline) atomic_set(&lun->lun_tg_pt_secondary_offline, 1); else atomic_set(&lun->lun_tg_pt_secondary_offline, 0); lun->lun_tg_pt_secondary_stat = (explicit) ? ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG : ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA; pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" " to secondary access state: %s\n", (explicit) ? "explicit" : "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); spin_unlock(&lun->lun_tg_pt_gp_lock); /* * Do the optional transition delay after we set the secondary * ALUA access state. */ if (trans_delay_msecs != 0) msleep_interruptible(trans_delay_msecs); /* * See if we need to update the ALUA fabric port metadata for * secondary state and status */ if (lun->lun_tg_pt_secondary_write_md) core_alua_update_tpg_secondary_metadata(lun); return 0; } struct t10_alua_lba_map * core_alua_allocate_lba_map(struct list_head *list, u64 first_lba, u64 last_lba) { struct t10_alua_lba_map *lba_map; lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL); if (!lba_map) { pr_err("Unable to allocate struct t10_alua_lba_map\n"); return ERR_PTR(-ENOMEM); } INIT_LIST_HEAD(&lba_map->lba_map_mem_list); lba_map->lba_map_first_lba = first_lba; lba_map->lba_map_last_lba = last_lba; list_add_tail(&lba_map->lba_map_list, list); return lba_map; } int core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map, int pg_id, int state) { struct t10_alua_lba_map_member *lba_map_mem; list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list, lba_map_mem_list) { if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) { pr_err("Duplicate pg_id %d in lba_map\n", pg_id); return -EINVAL; } } lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL); if (!lba_map_mem) { pr_err("Unable to allocate struct t10_alua_lba_map_mem\n"); return -ENOMEM; } lba_map_mem->lba_map_mem_alua_state = state; lba_map_mem->lba_map_mem_alua_pg_id = pg_id; list_add_tail(&lba_map_mem->lba_map_mem_list, &lba_map->lba_map_mem_list); return 0; } void core_alua_free_lba_map(struct list_head *lba_list) { struct t10_alua_lba_map *lba_map, *lba_map_tmp; struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp; list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list, lba_map_list) { list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp, &lba_map->lba_map_mem_list, lba_map_mem_list) { list_del(&lba_map_mem->lba_map_mem_list); kmem_cache_free(t10_alua_lba_map_mem_cache, lba_map_mem); } list_del(&lba_map->lba_map_list); kmem_cache_free(t10_alua_lba_map_cache, lba_map); } } void core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list, int segment_size, int segment_mult) { struct list_head old_lba_map_list; struct t10_alua_tg_pt_gp *tg_pt_gp; int activate = 0, supported; INIT_LIST_HEAD(&old_lba_map_list); spin_lock(&dev->t10_alua.lba_map_lock); dev->t10_alua.lba_map_segment_size = segment_size; dev->t10_alua.lba_map_segment_multiplier = segment_mult; list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list); if (lba_map_list) { list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list); activate = 1; } spin_unlock(&dev->t10_alua.lba_map_lock); spin_lock(&dev->t10_alua.tg_pt_gps_lock); list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, tg_pt_gp_list) { if (!tg_pt_gp->tg_pt_gp_valid_id) continue; supported = tg_pt_gp->tg_pt_gp_alua_supported_states; if (activate) supported |= ALUA_LBD_SUP; else supported &= ~ALUA_LBD_SUP; tg_pt_gp->tg_pt_gp_alua_supported_states = supported; } spin_unlock(&dev->t10_alua.tg_pt_gps_lock); core_alua_free_lba_map(&old_lba_map_list); } struct t10_alua_lu_gp * core_alua_allocate_lu_gp(const char *name, int def_group) { struct t10_alua_lu_gp *lu_gp; lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); if (!lu_gp) { pr_err("Unable to allocate struct t10_alua_lu_gp\n"); return ERR_PTR(-ENOMEM); } INIT_LIST_HEAD(&lu_gp->lu_gp_node); INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); spin_lock_init(&lu_gp->lu_gp_lock); atomic_set(&lu_gp->lu_gp_ref_cnt, 0); if (def_group) { lu_gp->lu_gp_id = alua_lu_gps_counter++; lu_gp->lu_gp_valid_id = 1; alua_lu_gps_count++; } return lu_gp; } int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) { struct t10_alua_lu_gp *lu_gp_tmp; u16 lu_gp_id_tmp; /* * The lu_gp->lu_gp_id may only be set once.. */ if (lu_gp->lu_gp_valid_id) { pr_warn("ALUA LU Group already has a valid ID," " ignoring request\n"); return -EINVAL; } spin_lock(&lu_gps_lock); if (alua_lu_gps_count == 0x0000ffff) { pr_err("Maximum ALUA alua_lu_gps_count:" " 0x0000ffff reached\n"); spin_unlock(&lu_gps_lock); kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); return -ENOSPC; } again: lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : alua_lu_gps_counter++; list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { if (!lu_gp_id) goto again; pr_warn("ALUA Logical Unit Group ID: %hu" " already exists, ignoring request\n", lu_gp_id); spin_unlock(&lu_gps_lock); return -EINVAL; } } lu_gp->lu_gp_id = lu_gp_id_tmp; lu_gp->lu_gp_valid_id = 1; list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); alua_lu_gps_count++; spin_unlock(&lu_gps_lock); return 0; } static struct t10_alua_lu_gp_member * core_alua_allocate_lu_gp_mem(struct se_device *dev) { struct t10_alua_lu_gp_member *lu_gp_mem; lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); if (!lu_gp_mem) { pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); return ERR_PTR(-ENOMEM); } INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); lu_gp_mem->lu_gp_mem_dev = dev; dev->dev_alua_lu_gp_mem = lu_gp_mem; return lu_gp_mem; } void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) { struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; /* * Once we have reached this point, config_item_put() has * already been called from target_core_alua_drop_lu_gp(). * * Here, we remove the *lu_gp from the global list so that * no associations can be made while we are releasing * struct t10_alua_lu_gp. */ spin_lock(&lu_gps_lock); list_del(&lu_gp->lu_gp_node); alua_lu_gps_count--; spin_unlock(&lu_gps_lock); /* * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() * in target_core_configfs.c:target_core_store_alua_lu_gp() to be * released with core_alua_put_lu_gp_from_name() */ while (atomic_read(&lu_gp->lu_gp_ref_cnt)) cpu_relax(); /* * Release reference to struct t10_alua_lu_gp * from all associated * struct se_device. */ spin_lock(&lu_gp->lu_gp_lock); list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { if (lu_gp_mem->lu_gp_assoc) { list_del(&lu_gp_mem->lu_gp_mem_list); lu_gp->lu_gp_members--; lu_gp_mem->lu_gp_assoc = 0; } spin_unlock(&lu_gp->lu_gp_lock); /* * * lu_gp_mem is associated with a single * struct se_device->dev_alua_lu_gp_mem, and is released when * struct se_device is released via core_alua_free_lu_gp_mem(). * * If the passed lu_gp does NOT match the default_lu_gp, assume * we want to re-associate a given lu_gp_mem with default_lu_gp. */ spin_lock(&lu_gp_mem->lu_gp_mem_lock); if (lu_gp != default_lu_gp) __core_alua_attach_lu_gp_mem(lu_gp_mem, default_lu_gp); else lu_gp_mem->lu_gp = NULL; spin_unlock(&lu_gp_mem->lu_gp_mem_lock); spin_lock(&lu_gp->lu_gp_lock); } spin_unlock(&lu_gp->lu_gp_lock); kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); } void core_alua_free_lu_gp_mem(struct se_device *dev) { struct t10_alua_lu_gp *lu_gp; struct t10_alua_lu_gp_member *lu_gp_mem; lu_gp_mem = dev->dev_alua_lu_gp_mem; if (!lu_gp_mem) return; while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) cpu_relax(); spin_lock(&lu_gp_mem->lu_gp_mem_lock); lu_gp = lu_gp_mem->lu_gp; if (lu_gp) { spin_lock(&lu_gp->lu_gp_lock); if (lu_gp_mem->lu_gp_assoc) { list_del(&lu_gp_mem->lu_gp_mem_list); lu_gp->lu_gp_members--; lu_gp_mem->lu_gp_assoc = 0; } spin_unlock(&lu_gp->lu_gp_lock); lu_gp_mem->lu_gp = NULL; } spin_unlock(&lu_gp_mem->lu_gp_mem_lock); kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); } struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) { struct t10_alua_lu_gp *lu_gp; struct config_item *ci; spin_lock(&lu_gps_lock); list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { if (!lu_gp->lu_gp_valid_id) continue; ci = &lu_gp->lu_gp_group.cg_item; if (!strcmp(config_item_name(ci), name)) { atomic_inc(&lu_gp->lu_gp_ref_cnt); spin_unlock(&lu_gps_lock); return lu_gp; } } spin_unlock(&lu_gps_lock); return NULL; } void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) { spin_lock(&lu_gps_lock); atomic_dec(&lu_gp->lu_gp_ref_cnt); spin_unlock(&lu_gps_lock); } /* * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock */ void __core_alua_attach_lu_gp_mem( struct t10_alua_lu_gp_member *lu_gp_mem, struct t10_alua_lu_gp *lu_gp) { spin_lock(&lu_gp->lu_gp_lock); lu_gp_mem->lu_gp = lu_gp; lu_gp_mem->lu_gp_assoc = 1; list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); lu_gp->lu_gp_members++; spin_unlock(&lu_gp->lu_gp_lock); } /* * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock */ void __core_alua_drop_lu_gp_mem( struct t10_alua_lu_gp_member *lu_gp_mem, struct t10_alua_lu_gp *lu_gp) { spin_lock(&lu_gp->lu_gp_lock); list_del(&lu_gp_mem->lu_gp_mem_list); lu_gp_mem->lu_gp = NULL; lu_gp_mem->lu_gp_assoc = 0; lu_gp->lu_gp_members--; spin_unlock(&lu_gp->lu_gp_lock); } struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, const char *name, int def_group) { struct t10_alua_tg_pt_gp *tg_pt_gp; tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); if (!tg_pt_gp) { pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); return NULL; } INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list); mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex); spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); tg_pt_gp->tg_pt_gp_dev = dev; tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED; /* * Enable both explicit and implicit ALUA support by default */ tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA; /* * Set the default Active/NonOptimized Delay in milliseconds */ tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS; /* * Enable all supported states */ tg_pt_gp->tg_pt_gp_alua_supported_states = ALUA_T_SUP | ALUA_O_SUP | ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP; if (def_group) { spin_lock(&dev->t10_alua.tg_pt_gps_lock); tg_pt_gp->tg_pt_gp_id = dev->t10_alua.alua_tg_pt_gps_counter++; tg_pt_gp->tg_pt_gp_valid_id = 1; dev->t10_alua.alua_tg_pt_gps_count++; list_add_tail(&tg_pt_gp->tg_pt_gp_list, &dev->t10_alua.tg_pt_gps_list); spin_unlock(&dev->t10_alua.tg_pt_gps_lock); } return tg_pt_gp; } int core_alua_set_tg_pt_gp_id( struct t10_alua_tg_pt_gp *tg_pt_gp, u16 tg_pt_gp_id) { struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; u16 tg_pt_gp_id_tmp; /* * The tg_pt_gp->tg_pt_gp_id may only be set once.. */ if (tg_pt_gp->tg_pt_gp_valid_id) { pr_warn("ALUA TG PT Group already has a valid ID," " ignoring request\n"); return -EINVAL; } spin_lock(&dev->t10_alua.tg_pt_gps_lock); if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { pr_err("Maximum ALUA alua_tg_pt_gps_count:" " 0x0000ffff reached\n"); spin_unlock(&dev->t10_alua.tg_pt_gps_lock); return -ENOSPC; } again: tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : dev->t10_alua.alua_tg_pt_gps_counter++; list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, tg_pt_gp_list) { if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { if (!tg_pt_gp_id) goto again; pr_err("ALUA Target Port Group ID: %hu already" " exists, ignoring request\n", tg_pt_gp_id); spin_unlock(&dev->t10_alua.tg_pt_gps_lock); return -EINVAL; } } tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; tg_pt_gp->tg_pt_gp_valid_id = 1; list_add_tail(&tg_pt_gp->tg_pt_gp_list, &dev->t10_alua.tg_pt_gps_list); dev->t10_alua.alua_tg_pt_gps_count++; spin_unlock(&dev->t10_alua.tg_pt_gps_lock); return 0; } void core_alua_free_tg_pt_gp( struct t10_alua_tg_pt_gp *tg_pt_gp) { struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; struct se_lun *lun, *next; /* * Once we have reached this point, config_item_put() has already * been called from target_core_alua_drop_tg_pt_gp(). * * Here we remove *tg_pt_gp from the global list so that * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS * can be made while we are releasing struct t10_alua_tg_pt_gp. */ spin_lock(&dev->t10_alua.tg_pt_gps_lock); if (tg_pt_gp->tg_pt_gp_valid_id) { list_del(&tg_pt_gp->tg_pt_gp_list); dev->t10_alua.alua_tg_pt_gps_count--; } spin_unlock(&dev->t10_alua.tg_pt_gps_lock); /* * Allow a struct t10_alua_tg_pt_gp_member * referenced by * core_alua_get_tg_pt_gp_by_name() in * target_core_configfs.c:target_core_store_alua_tg_pt_gp() * to be released with core_alua_put_tg_pt_gp_from_name(). */ while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) cpu_relax(); /* * Release reference to struct t10_alua_tg_pt_gp from all associated * struct se_port. */ spin_lock(&tg_pt_gp->tg_pt_gp_lock); list_for_each_entry_safe(lun, next, &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) { list_del_init(&lun->lun_tg_pt_gp_link); tg_pt_gp->tg_pt_gp_members--; spin_unlock(&tg_pt_gp->tg_pt_gp_lock); /* * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, * assume we want to re-associate a given tg_pt_gp_mem with * default_tg_pt_gp. */ spin_lock(&lun->lun_tg_pt_gp_lock); if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { __target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp); } else lun->lun_tg_pt_gp = NULL; spin_unlock(&lun->lun_tg_pt_gp_lock); spin_lock(&tg_pt_gp->tg_pt_gp_lock); } spin_unlock(&tg_pt_gp->tg_pt_gp_lock); kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); } static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( struct se_device *dev, const char *name) { struct t10_alua_tg_pt_gp *tg_pt_gp; struct config_item *ci; spin_lock(&dev->t10_alua.tg_pt_gps_lock); list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, tg_pt_gp_list) { if (!tg_pt_gp->tg_pt_gp_valid_id) continue; ci = &tg_pt_gp->tg_pt_gp_group.cg_item; if (!strcmp(config_item_name(ci), name)) { atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); spin_unlock(&dev->t10_alua.tg_pt_gps_lock); return tg_pt_gp; } } spin_unlock(&dev->t10_alua.tg_pt_gps_lock); return NULL; } static void core_alua_put_tg_pt_gp_from_name( struct t10_alua_tg_pt_gp *tg_pt_gp) { struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; spin_lock(&dev->t10_alua.tg_pt_gps_lock); atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); spin_unlock(&dev->t10_alua.tg_pt_gps_lock); } static void __target_attach_tg_pt_gp(struct se_lun *lun, struct t10_alua_tg_pt_gp *tg_pt_gp) { struct se_dev_entry *se_deve; assert_spin_locked(&lun->lun_tg_pt_gp_lock); spin_lock(&tg_pt_gp->tg_pt_gp_lock); lun->lun_tg_pt_gp = tg_pt_gp; list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list); tg_pt_gp->tg_pt_gp_members++; spin_lock(&lun->lun_deve_lock); list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) core_scsi3_ua_allocate(se_deve, 0x3f, ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED); spin_unlock(&lun->lun_deve_lock); spin_unlock(&tg_pt_gp->tg_pt_gp_lock); } void target_attach_tg_pt_gp(struct se_lun *lun, struct t10_alua_tg_pt_gp *tg_pt_gp) { spin_lock(&lun->lun_tg_pt_gp_lock); __target_attach_tg_pt_gp(lun, tg_pt_gp); spin_unlock(&lun->lun_tg_pt_gp_lock); } static void __target_detach_tg_pt_gp(struct se_lun *lun, struct t10_alua_tg_pt_gp *tg_pt_gp) { assert_spin_locked(&lun->lun_tg_pt_gp_lock); spin_lock(&tg_pt_gp->tg_pt_gp_lock); list_del_init(&lun->lun_tg_pt_gp_link); tg_pt_gp->tg_pt_gp_members--; spin_unlock(&tg_pt_gp->tg_pt_gp_lock); lun->lun_tg_pt_gp = NULL; } void target_detach_tg_pt_gp(struct se_lun *lun) { struct t10_alua_tg_pt_gp *tg_pt_gp; spin_lock(&lun->lun_tg_pt_gp_lock); tg_pt_gp = lun->lun_tg_pt_gp; if (tg_pt_gp) __target_detach_tg_pt_gp(lun, tg_pt_gp); spin_unlock(&lun->lun_tg_pt_gp_lock); } ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page) { struct config_item *tg_pt_ci; struct t10_alua_tg_pt_gp *tg_pt_gp; ssize_t len = 0; spin_lock(&lun->lun_tg_pt_gp_lock); tg_pt_gp = lun->lun_tg_pt_gp; if (tg_pt_gp) { tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" " %hu\nTG Port Primary Access State: %s\nTG Port " "Primary Access Status: %s\nTG Port Secondary Access" " State: %s\nTG Port Secondary Access Status: %s\n", config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, core_alua_dump_state( tg_pt_gp->tg_pt_gp_alua_access_state), core_alua_dump_status( tg_pt_gp->tg_pt_gp_alua_access_status), atomic_read(&lun->lun_tg_pt_secondary_offline) ? "Offline" : "None", core_alua_dump_status(lun->lun_tg_pt_secondary_stat)); } spin_unlock(&lun->lun_tg_pt_gp_lock); return len; } ssize_t core_alua_store_tg_pt_gp_info( struct se_lun *lun, const char *page, size_t count) { struct se_portal_group *tpg = lun->lun_tpg; /* * rcu_dereference_raw protected by se_lun->lun_group symlink * reference to se_device->dev_group. */ struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev); struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; unsigned char buf[TG_PT_GROUP_NAME_BUF]; int move = 0; if (dev->transport_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_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_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; }