| /******************************************************************************* |
| * Filename: target_core_alua.c |
| * |
| * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) |
| * |
| * Copyright (c) 2009-2010 Rising Tide Systems |
| * Copyright (c) 2009-2010 Linux-iSCSI.org |
| * |
| * 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/version.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/configfs.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_device.h> |
| #include <target/target_core_transport.h> |
| #include <target/target_core_fabric_ops.h> |
| #include <target/target_core_configfs.h> |
| |
| #include "target_core_alua.h" |
| #include "target_core_hba.h" |
| #include "target_core_ua.h" |
| |
| static int core_alua_check_transition(int state, 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 explict, int offline); |
| |
| /* |
| * REPORT_TARGET_PORT_GROUPS |
| * |
| * See spc4r17 section 6.27 |
| */ |
| int core_emulate_report_target_port_groups(struct se_cmd *cmd) |
| { |
| struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_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 = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
| Target port group descriptor */ |
| /* |
| * Need at least 4 bytes of response data or else we can't |
| * even fit the return data length. |
| */ |
| if (cmd->data_length < 4) { |
| pr_warn("REPORT TARGET PORT GROUPS allocation length %u" |
| " too small\n", cmd->data_length); |
| return -EINVAL; |
| } |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->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] = 0x80; /* T_SUP */ |
| buf[off] |= 0x40; /* O_SUP */ |
| buf[off] |= 0x8; /* U_SUP */ |
| buf[off] |= 0x4; /* S_SUP */ |
| buf[off] |= 0x2; /* AN_SUP */ |
| buf[off++] |= 0x1; /* AO_SUP */ |
| /* |
| * 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(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| /* |
| * Set the RETURN DATA LENGTH set in the header of the DataIN Payload |
| */ |
| buf[0] = ((rd_len >> 24) & 0xff); |
| buf[1] = ((rd_len >> 16) & 0xff); |
| buf[2] = ((rd_len >> 8) & 0xff); |
| buf[3] = (rd_len & 0xff); |
| |
| return 0; |
| } |
| |
| /* |
| * SET_TARGET_PORT_GROUPS for explict ALUA operation. |
| * |
| * See spc4r17 section 6.35 |
| */ |
| int core_emulate_set_target_port_groups(struct se_cmd *cmd) |
| { |
| struct se_device *dev = SE_DEV(cmd); |
| struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev; |
| struct se_port *port, *l_port = SE_LUN(cmd)->lun_sep; |
| struct se_node_acl *nacl = SE_SESS(cmd)->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 *)T_TASK(cmd)->t_task_buf; |
| unsigned char *ptr = &buf[4]; /* Skip over RESERVED area in header */ |
| u32 len = 4; /* Skip over RESERVED area in header */ |
| int alua_access_state, primary = 0, rc; |
| u16 tg_pt_id, rtpi; |
| |
| if (!(l_port)) |
| return PYX_TRANSPORT_LU_COMM_FAILURE; |
| /* |
| * Determine if explict 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)) { |
| printk(KERN_ERR "Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); |
| return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| } |
| 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); |
| printk(KERN_ERR "Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
| return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| } |
| rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); |
| spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| |
| if (!(rc)) { |
| printk(KERN_INFO "Unable to process SET_TARGET_PORT_GROUPS" |
| " while TPGS_EXPLICT_ALUA is disabled\n"); |
| return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| } |
| |
| while (len < cmd->data_length) { |
| 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, &primary); |
| if (rc != 0) { |
| /* |
| * 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. |
| */ |
| return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| } |
| rc = -1; |
| /* |
| * 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 = ((ptr[2] << 8) & 0xff); |
| tg_pt_id |= (ptr[3] & 0xff); |
| /* |
| * Locate the matching target port group ID from |
| * the global tg_pt_gp list |
| */ |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| list_for_each_entry(tg_pt_gp, |
| &T10_ALUA(su_dev)->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_inc(); |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| |
| rc = core_alua_do_port_transition(tg_pt_gp, |
| dev, l_port, nacl, |
| alua_access_state, 1); |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| smp_mb__after_atomic_dec(); |
| break; |
| } |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| /* |
| * If not matching target port group ID can be located |
| * throw an exception with ASCQ: INVALID_PARAMETER_LIST |
| */ |
| if (rc != 0) |
| return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| } else { |
| /* |
| * Extact the RELATIVE TARGET PORT IDENTIFIER to identify |
| * the Target Port in question for the the incoming |
| * SET_TARGET_PORT_GROUPS op. |
| */ |
| rtpi = ((ptr[2] << 8) & 0xff); |
| rtpi |= (ptr[3] & 0xff); |
| /* |
| * Locate the matching relative target port identifer |
| * 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); |
| |
| rc = core_alua_set_tg_pt_secondary_state( |
| tg_pt_gp_mem, port, 1, 1); |
| |
| spin_lock(&dev->se_port_lock); |
| break; |
| } |
| spin_unlock(&dev->se_port_lock); |
| /* |
| * If not matching relative target port identifier can |
| * be located, throw an exception with ASCQ: |
| * INVALID_PARAMETER_LIST |
| */ |
| if (rc != 0) |
| return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| } |
| |
| ptr += 4; |
| len += 4; |
| } |
| |
| return 0; |
| } |
| |
| static inline int core_alua_state_nonoptimized( |
| struct se_cmd *cmd, |
| unsigned char *cdb, |
| int nonop_delay_msecs, |
| u8 *alua_ascq) |
| { |
| /* |
| * 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; |
| return 0; |
| } |
| |
| static inline int core_alua_state_standby( |
| struct se_cmd *cmd, |
| unsigned char *cdb, |
| u8 *alua_ascq) |
| { |
| /* |
| * 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 MAINTENANCE_IN: |
| switch (cdb[1]) { |
| case MI_REPORT_TARGET_PGS: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| return 1; |
| } |
| case MAINTENANCE_OUT: |
| switch (cdb[1]) { |
| case MO_SET_TARGET_PGS: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| return 1; |
| } |
| case REQUEST_SENSE: |
| case PERSISTENT_RESERVE_IN: |
| case PERSISTENT_RESERVE_OUT: |
| case READ_BUFFER: |
| case WRITE_BUFFER: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static inline int core_alua_state_unavailable( |
| struct se_cmd *cmd, |
| unsigned char *cdb, |
| u8 *alua_ascq) |
| { |
| /* |
| * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by |
| * spc4r17 section 5.9.2.4.5 |
| */ |
| switch (cdb[0]) { |
| case INQUIRY: |
| case REPORT_LUNS: |
| case MAINTENANCE_IN: |
| switch (cdb[1]) { |
| case MI_REPORT_TARGET_PGS: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| return 1; |
| } |
| case MAINTENANCE_OUT: |
| switch (cdb[1]) { |
| case MO_SET_TARGET_PGS: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| return 1; |
| } |
| case REQUEST_SENSE: |
| case READ_BUFFER: |
| case WRITE_BUFFER: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static inline int core_alua_state_transition( |
| struct se_cmd *cmd, |
| unsigned char *cdb, |
| u8 *alua_ascq) |
| { |
| /* |
| * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by |
| * spc4r17 section 5.9.2.5 |
| */ |
| switch (cdb[0]) { |
| case INQUIRY: |
| case REPORT_LUNS: |
| case MAINTENANCE_IN: |
| switch (cdb[1]) { |
| case MI_REPORT_TARGET_PGS: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| return 1; |
| } |
| case REQUEST_SENSE: |
| case READ_BUFFER: |
| case WRITE_BUFFER: |
| return 0; |
| default: |
| *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED |
| * in transport_cmd_sequencer(). This function is assigned to |
| * struct t10_alua *->state_check() in core_setup_alua() |
| */ |
| static int core_alua_state_check_nop( |
| struct se_cmd *cmd, |
| unsigned char *cdb, |
| u8 *alua_ascq) |
| { |
| return 0; |
| } |
| |
| /* |
| * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). |
| * This function is assigned to struct t10_alua *->state_check() in |
| * core_setup_alua() |
| * |
| * Also, this function can return three different return codes to |
| * signal transport_generic_cmd_sequencer() |
| * |
| * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
| * return 0: Used to signal success |
| * reutrn -1: Used to signal failure, and invalid cdb field |
| */ |
| static int core_alua_state_check( |
| struct se_cmd *cmd, |
| unsigned char *cdb, |
| u8 *alua_ascq) |
| { |
| struct se_lun *lun = SE_LUN(cmd); |
| struct se_port *port = lun->lun_sep; |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| int out_alua_state, nonop_delay_msecs; |
| |
| if (!(port)) |
| return 0; |
| /* |
| * First, check for a struct se_port specific secondary ALUA target port |
| * access state: OFFLINE |
| */ |
| if (atomic_read(&port->sep_tg_pt_secondary_offline)) { |
| *alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
| printk(KERN_INFO "ALUA: Got secondary offline status for local" |
| " target port\n"); |
| *alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
| return 1; |
| } |
| /* |
| * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the |
| * ALUA target port group, to obtain current ALUA access state. |
| * Otherwise look for the underlying struct se_device association with |
| * a ALUA logical unit group. |
| */ |
| tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; |
| spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| /* |
| * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
| * statement so the compiler knows explicitly to check this case first. |
| * For the Optimized ALUA access state case, we want to process the |
| * incoming fabric cmd ASAP.. |
| */ |
| if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) |
| return 0; |
| |
| switch (out_alua_state) { |
| case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| return core_alua_state_nonoptimized(cmd, cdb, |
| nonop_delay_msecs, alua_ascq); |
| case ALUA_ACCESS_STATE_STANDBY: |
| return core_alua_state_standby(cmd, cdb, alua_ascq); |
| case ALUA_ACCESS_STATE_UNAVAILABLE: |
| return core_alua_state_unavailable(cmd, cdb, alua_ascq); |
| case ALUA_ACCESS_STATE_TRANSITION: |
| return core_alua_state_transition(cmd, cdb, alua_ascq); |
| /* |
| * OFFLINE is a secondary ALUA target port group access state, that is |
| * handled above with struct se_port->sep_tg_pt_secondary_offline=1 |
| */ |
| case ALUA_ACCESS_STATE_OFFLINE: |
| default: |
| printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", |
| out_alua_state); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Check implict and explict ALUA state change request. |
| */ |
| static int core_alua_check_transition(int state, int *primary) |
| { |
| switch (state) { |
| case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| case ALUA_ACCESS_STATE_STANDBY: |
| case ALUA_ACCESS_STATE_UNAVAILABLE: |
| /* |
| * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are |
| * defined as primary target port asymmetric access states. |
| */ |
| *primary = 1; |
| break; |
| case ALUA_ACCESS_STATE_OFFLINE: |
| /* |
| * OFFLINE state is defined as a secondary target port |
| * asymmetric access state. |
| */ |
| *primary = 0; |
| break; |
| default: |
| printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", state); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static char *core_alua_dump_state(int state) |
| { |
| switch (state) { |
| case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| return "Active/Optimized"; |
| case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| return "Active/NonOptimized"; |
| case ALUA_ACCESS_STATE_STANDBY: |
| return "Standby"; |
| case ALUA_ACCESS_STATE_UNAVAILABLE: |
| return "Unavailable"; |
| case ALUA_ACCESS_STATE_OFFLINE: |
| return "Offline"; |
| default: |
| return "Unknown"; |
| } |
| |
| return NULL; |
| } |
| |
| char *core_alua_dump_status(int status) |
| { |
| switch (status) { |
| case ALUA_STATUS_NONE: |
| return "None"; |
| case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: |
| return "Altered by Explict STPG"; |
| case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: |
| return "Altered by Implict ALUA"; |
| default: |
| return "Unknown"; |
| } |
| |
| return NULL; |
| } |
| |
| /* |
| * Used by fabric modules to determine when we need to delay processing |
| * for the Active/NonOptimized paths.. |
| */ |
| int core_alua_check_nonop_delay( |
| struct se_cmd *cmd) |
| { |
| if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) |
| return 0; |
| if (in_interrupt()) |
| return 0; |
| /* |
| * The ALUA Active/NonOptimized access state delay can be disabled |
| * in via configfs with a value of zero |
| */ |
| if (!(cmd->alua_nonop_delay)) |
| return 0; |
| /* |
| * struct se_cmd->alua_nonop_delay gets set by a target port group |
| * defined interval in core_alua_state_nonoptimized() |
| */ |
| msleep_interruptible(cmd->alua_nonop_delay); |
| return 0; |
| } |
| EXPORT_SYMBOL(core_alua_check_nonop_delay); |
| |
| /* |
| * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex |
| * |
| */ |
| static int core_alua_write_tpg_metadata( |
| const char *path, |
| unsigned char *md_buf, |
| u32 md_buf_len) |
| { |
| mm_segment_t old_fs; |
| struct file *file; |
| struct iovec iov[1]; |
| int flags = O_RDWR | O_CREAT | O_TRUNC, ret; |
| |
| memset(iov, 0, sizeof(struct iovec)); |
| |
| file = filp_open(path, flags, 0600); |
| if (IS_ERR(file) || !file || !file->f_dentry) { |
| printk(KERN_ERR "filp_open(%s) for ALUA metadata failed\n", |
| path); |
| return -ENODEV; |
| } |
| |
| iov[0].iov_base = &md_buf[0]; |
| iov[0].iov_len = md_buf_len; |
| |
| old_fs = get_fs(); |
| set_fs(get_ds()); |
| ret = vfs_writev(file, &iov[0], 1, &file->f_pos); |
| set_fs(old_fs); |
| |
| if (ret < 0) { |
| printk(KERN_ERR "Error writing ALUA metadata file: %s\n", path); |
| filp_close(file, NULL); |
| return -EIO; |
| } |
| filp_close(file, NULL); |
| |
| return 0; |
| } |
| |
| /* |
| * Called with tg_pt_gp->tg_pt_gp_md_mutex held |
| */ |
| static int core_alua_update_tpg_primary_metadata( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| int primary_state, |
| unsigned char *md_buf) |
| { |
| struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| struct t10_wwn *wwn = &su_dev->t10_wwn; |
| char path[ALUA_METADATA_PATH_LEN]; |
| int len; |
| |
| memset(path, 0, ALUA_METADATA_PATH_LEN); |
| |
| len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, |
| "tg_pt_gp_id=%hu\n" |
| "alua_access_state=0x%02x\n" |
| "alua_access_status=0x%02x\n", |
| tg_pt_gp->tg_pt_gp_id, primary_state, |
| tg_pt_gp->tg_pt_gp_alua_access_status); |
| |
| snprintf(path, ALUA_METADATA_PATH_LEN, |
| "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], |
| config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); |
| |
| return core_alua_write_tpg_metadata(path, md_buf, len); |
| } |
| |
| static int core_alua_do_transition_tg_pt( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| struct se_port *l_port, |
| struct se_node_acl *nacl, |
| unsigned char *md_buf, |
| int new_state, |
| int explict) |
| { |
| struct se_dev_entry *se_deve; |
| struct se_lun_acl *lacl; |
| struct se_port *port; |
| struct t10_alua_tg_pt_gp_member *mem; |
| int old_state = 0; |
| /* |
| * Save the old primary ALUA access state, and set the current state |
| * to ALUA_ACCESS_STATE_TRANSITION. |
| */ |
| old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| ALUA_ACCESS_STATE_TRANSITION); |
| tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? |
| ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| /* |
| * Check for the optional ALUA primary state transition delay |
| */ |
| if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) |
| msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| tg_pt_gp_mem_list) { |
| port = mem->tg_pt; |
| /* |
| * After an implicit target port asymmetric access state |
| * change, a device server shall establish a unit attention |
| * condition for the initiator port associated with every I_T |
| * nexus with the additional sense code set to ASYMMETRIC |
| * ACCESS STATE CHAGED. |
| * |
| * After an explicit target port asymmetric access state |
| * change, a device server shall establish a unit attention |
| * condition with the additional sense code set to ASYMMETRIC |
| * ACCESS STATE CHANGED for the initiator port associated with |
| * every I_T nexus other than the I_T nexus on which the SET |
| * TARGET PORT GROUPS command |
| */ |
| atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); |
| smp_mb__after_atomic_inc(); |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| |
| spin_lock_bh(&port->sep_alua_lock); |
| list_for_each_entry(se_deve, &port->sep_alua_list, |
| alua_port_list) { |
| lacl = se_deve->se_lun_acl; |
| /* |
| * se_deve->se_lun_acl pointer may be NULL for a |
| * entry created without explict Node+MappedLUN ACLs |
| */ |
| if (!(lacl)) |
| continue; |
| |
| if (explict && |
| (nacl != NULL) && (nacl == lacl->se_lun_nacl) && |
| (l_port != NULL) && (l_port == port)) |
| continue; |
| |
| core_scsi3_ua_allocate(lacl->se_lun_nacl, |
| se_deve->mapped_lun, 0x2A, |
| ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); |
| } |
| spin_unlock_bh(&port->sep_alua_lock); |
| |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); |
| smp_mb__after_atomic_dec(); |
| } |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| /* |
| * Update the ALUA metadata buf that has been allocated in |
| * core_alua_do_port_transition(), this metadata will be written |
| * to struct file. |
| * |
| * Note that there is the case where we do not want to update the |
| * metadata when the saved metadata is being parsed in userspace |
| * when setting the existing port access state and access status. |
| * |
| * Also note that the failure to write out the ALUA metadata to |
| * struct file does NOT affect the actual ALUA transition. |
| */ |
| if (tg_pt_gp->tg_pt_gp_write_metadata) { |
| mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| core_alua_update_tpg_primary_metadata(tg_pt_gp, |
| new_state, md_buf); |
| mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| } |
| /* |
| * Set the current primary ALUA access state to the requested new state |
| */ |
| atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); |
| |
| printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu" |
| " from primary access state %s to %s\n", (explict) ? "explict" : |
| "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), |
| core_alua_dump_state(new_state)); |
| |
| return 0; |
| } |
| |
| int core_alua_do_port_transition( |
| struct t10_alua_tg_pt_gp *l_tg_pt_gp, |
| struct se_device *l_dev, |
| struct se_port *l_port, |
| struct se_node_acl *l_nacl, |
| int new_state, |
| int explict) |
| { |
| struct se_device *dev; |
| struct se_port *port; |
| struct se_subsystem_dev *su_dev; |
| struct se_node_acl *nacl; |
| struct t10_alua_lu_gp *lu_gp; |
| struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| unsigned char *md_buf; |
| int primary; |
| |
| if (core_alua_check_transition(new_state, &primary) != 0) |
| return -EINVAL; |
| |
| md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); |
| if (!(md_buf)) { |
| printk("Unable to allocate buf for ALUA metadata\n"); |
| return -ENOMEM; |
| } |
| |
| local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; |
| spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); |
| lu_gp = local_lu_gp_mem->lu_gp; |
| atomic_inc(&lu_gp->lu_gp_ref_cnt); |
| smp_mb__after_atomic_inc(); |
| spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); |
| /* |
| * For storage objects that are members of the 'default_lu_gp', |
| * we only do transition on the passed *l_tp_pt_gp, and not |
| * on all of the matching target port groups IDs in default_lu_gp. |
| */ |
| if (!(lu_gp->lu_gp_id)) { |
| /* |
| * core_alua_do_transition_tg_pt() will always return |
| * success. |
| */ |
| core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, |
| md_buf, new_state, explict); |
| atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| smp_mb__after_atomic_dec(); |
| kfree(md_buf); |
| return 0; |
| } |
| /* |
| * For all other LU groups aside from 'default_lu_gp', walk all of |
| * the associated storage objects looking for a matching target port |
| * group ID from the local target port group. |
| */ |
| spin_lock(&lu_gp->lu_gp_lock); |
| list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, |
| lu_gp_mem_list) { |
| |
| dev = lu_gp_mem->lu_gp_mem_dev; |
| su_dev = dev->se_sub_dev; |
| atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| smp_mb__after_atomic_inc(); |
| spin_unlock(&lu_gp->lu_gp_lock); |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| list_for_each_entry(tg_pt_gp, |
| &T10_ALUA(su_dev)->tg_pt_gps_list, |
| tg_pt_gp_list) { |
| |
| if (!(tg_pt_gp->tg_pt_gp_valid_id)) |
| continue; |
| /* |
| * If the target behavior port asymmetric access state |
| * is changed for any target port group accessiable via |
| * a logical unit within a LU group, the target port |
| * behavior group asymmetric access states for the same |
| * target port group accessible via other logical units |
| * in that LU group will also change. |
| */ |
| if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) |
| continue; |
| |
| if (l_tg_pt_gp == tg_pt_gp) { |
| port = l_port; |
| nacl = l_nacl; |
| } else { |
| port = NULL; |
| nacl = NULL; |
| } |
| atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| smp_mb__after_atomic_inc(); |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| /* |
| * core_alua_do_transition_tg_pt() will always return |
| * success. |
| */ |
| core_alua_do_transition_tg_pt(tg_pt_gp, port, |
| nacl, md_buf, new_state, explict); |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| smp_mb__after_atomic_dec(); |
| } |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| |
| spin_lock(&lu_gp->lu_gp_lock); |
| atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| smp_mb__after_atomic_dec(); |
| } |
| spin_unlock(&lu_gp->lu_gp_lock); |
| |
| printk(KERN_INFO "Successfully processed LU Group: %s all ALUA TG PT" |
| " Group IDs: %hu %s transition to primary state: %s\n", |
| config_item_name(&lu_gp->lu_gp_group.cg_item), |
| l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", |
| core_alua_dump_state(new_state)); |
| |
| atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| smp_mb__after_atomic_dec(); |
| kfree(md_buf); |
| return 0; |
| } |
| |
| /* |
| * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held |
| */ |
| static int core_alua_update_tpg_secondary_metadata( |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| struct se_port *port, |
| unsigned char *md_buf, |
| u32 md_buf_len) |
| { |
| struct se_portal_group *se_tpg = port->sep_tpg; |
| char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; |
| int len; |
| |
| memset(path, 0, ALUA_METADATA_PATH_LEN); |
| memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); |
| |
| len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", |
| TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg)); |
| |
| if (TPG_TFO(se_tpg)->tpg_get_tag != NULL) |
| snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
| TPG_TFO(se_tpg)->tpg_get_tag(se_tpg)); |
| |
| len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" |
| "alua_tg_pt_status=0x%02x\n", |
| atomic_read(&port->sep_tg_pt_secondary_offline), |
| port->sep_tg_pt_secondary_stat); |
| |
| snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", |
| TPG_TFO(se_tpg)->get_fabric_name(), wwn, |
| port->sep_lun->unpacked_lun); |
| |
| return core_alua_write_tpg_metadata(path, md_buf, len); |
| } |
| |
| static int core_alua_set_tg_pt_secondary_state( |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| struct se_port *port, |
| int explict, |
| int offline) |
| { |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| unsigned char *md_buf; |
| u32 md_buf_len; |
| int trans_delay_msecs; |
| |
| spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| if (!(tg_pt_gp)) { |
| spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| printk(KERN_ERR "Unable to complete secondary state" |
| " transition\n"); |
| return -1; |
| } |
| trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; |
| /* |
| * Set the secondary ALUA target port access state to OFFLINE |
| * or release the previously secondary state for struct se_port |
| */ |
| if (offline) |
| atomic_set(&port->sep_tg_pt_secondary_offline, 1); |
| else |
| atomic_set(&port->sep_tg_pt_secondary_offline, 0); |
| |
| md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; |
| port->sep_tg_pt_secondary_stat = (explict) ? |
| ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| |
| printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu" |
| " to secondary access state: %s\n", (explict) ? "explict" : |
| "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); |
| |
| spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| /* |
| * Do the optional transition delay after we set the secondary |
| * ALUA access state. |
| */ |
| if (trans_delay_msecs != 0) |
| msleep_interruptible(trans_delay_msecs); |
| /* |
| * See if we need to update the ALUA fabric port metadata for |
| * secondary state and status |
| */ |
| if (port->sep_tg_pt_secondary_write_md) { |
| md_buf = kzalloc(md_buf_len, GFP_KERNEL); |
| if (!(md_buf)) { |
| printk(KERN_ERR "Unable to allocate md_buf for" |
| " secondary ALUA access metadata\n"); |
| return -1; |
| } |
| mutex_lock(&port->sep_tg_pt_md_mutex); |
| core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, |
| md_buf, md_buf_len); |
| mutex_unlock(&port->sep_tg_pt_md_mutex); |
| |
| kfree(md_buf); |
| } |
| |
| return 0; |
| } |
| |
| struct t10_alua_lu_gp * |
| core_alua_allocate_lu_gp(const char *name, int def_group) |
| { |
| struct t10_alua_lu_gp *lu_gp; |
| |
| lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); |
| if (!(lu_gp)) { |
| printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| INIT_LIST_HEAD(&lu_gp->lu_gp_list); |
| 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 = se_global->alua_lu_gps_counter++; |
| lu_gp->lu_gp_valid_id = 1; |
| se_global->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) { |
| printk(KERN_WARNING "ALUA LU Group already has a valid ID," |
| " ignoring request\n"); |
| return -1; |
| } |
| |
| spin_lock(&se_global->lu_gps_lock); |
| if (se_global->alua_lu_gps_count == 0x0000ffff) { |
| printk(KERN_ERR "Maximum ALUA se_global->alua_lu_gps_count:" |
| " 0x0000ffff reached\n"); |
| spin_unlock(&se_global->lu_gps_lock); |
| kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
| return -1; |
| } |
| again: |
| lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : |
| se_global->alua_lu_gps_counter++; |
| |
| list_for_each_entry(lu_gp_tmp, &se_global->g_lu_gps_list, lu_gp_list) { |
| if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
| if (!(lu_gp_id)) |
| goto again; |
| |
| printk(KERN_WARNING "ALUA Logical Unit Group ID: %hu" |
| " already exists, ignoring request\n", |
| lu_gp_id); |
| spin_unlock(&se_global->lu_gps_lock); |
| return -1; |
| } |
| } |
| |
| lu_gp->lu_gp_id = lu_gp_id_tmp; |
| lu_gp->lu_gp_valid_id = 1; |
| list_add_tail(&lu_gp->lu_gp_list, &se_global->g_lu_gps_list); |
| se_global->alua_lu_gps_count++; |
| spin_unlock(&se_global->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)) { |
| printk(KERN_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(&se_global->lu_gps_lock); |
| atomic_set(&lu_gp->lu_gp_shutdown, 1); |
| list_del(&lu_gp->lu_gp_list); |
| se_global->alua_lu_gps_count--; |
| spin_unlock(&se_global->lu_gps_lock); |
| /* |
| * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() |
| * in target_core_configfs.c:target_core_store_alua_lu_gp() to be |
| * released with core_alua_put_lu_gp_from_name() |
| */ |
| while (atomic_read(&lu_gp->lu_gp_ref_cnt)) |
| cpu_relax(); |
| /* |
| * Release reference to struct t10_alua_lu_gp * from all associated |
| * struct se_device. |
| */ |
| spin_lock(&lu_gp->lu_gp_lock); |
| list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, |
| &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { |
| if (lu_gp_mem->lu_gp_assoc) { |
| list_del(&lu_gp_mem->lu_gp_mem_list); |
| lu_gp->lu_gp_members--; |
| lu_gp_mem->lu_gp_assoc = 0; |
| } |
| spin_unlock(&lu_gp->lu_gp_lock); |
| /* |
| * |
| * lu_gp_mem is associated with a single |
| * struct se_device->dev_alua_lu_gp_mem, and is released when |
| * struct se_device is released via core_alua_free_lu_gp_mem(). |
| * |
| * If the passed lu_gp does NOT match the default_lu_gp, assume |
| * we want to re-assocate a given lu_gp_mem with default_lu_gp. |
| */ |
| spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| if (lu_gp != se_global->default_lu_gp) |
| __core_alua_attach_lu_gp_mem(lu_gp_mem, |
| se_global->default_lu_gp); |
| else |
| lu_gp_mem->lu_gp = NULL; |
| spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| |
| spin_lock(&lu_gp->lu_gp_lock); |
| } |
| spin_unlock(&lu_gp->lu_gp_lock); |
| |
| kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
| } |
| |
| void core_alua_free_lu_gp_mem(struct se_device *dev) |
| { |
| struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| struct t10_alua *alua = T10_ALUA(su_dev); |
| struct t10_alua_lu_gp *lu_gp; |
| struct t10_alua_lu_gp_member *lu_gp_mem; |
| |
| if (alua->alua_type != SPC3_ALUA_EMULATED) |
| return; |
| |
| lu_gp_mem = dev->dev_alua_lu_gp_mem; |
| if (!(lu_gp_mem)) |
| return; |
| |
| while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) |
| cpu_relax(); |
| |
| spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| lu_gp = lu_gp_mem->lu_gp; |
| if ((lu_gp)) { |
| spin_lock(&lu_gp->lu_gp_lock); |
| if (lu_gp_mem->lu_gp_assoc) { |
| list_del(&lu_gp_mem->lu_gp_mem_list); |
| lu_gp->lu_gp_members--; |
| lu_gp_mem->lu_gp_assoc = 0; |
| } |
| spin_unlock(&lu_gp->lu_gp_lock); |
| lu_gp_mem->lu_gp = NULL; |
| } |
| spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| |
| kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); |
| } |
| |
| struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) |
| { |
| struct t10_alua_lu_gp *lu_gp; |
| struct config_item *ci; |
| |
| spin_lock(&se_global->lu_gps_lock); |
| list_for_each_entry(lu_gp, &se_global->g_lu_gps_list, lu_gp_list) { |
| 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(&se_global->lu_gps_lock); |
| return lu_gp; |
| } |
| } |
| spin_unlock(&se_global->lu_gps_lock); |
| |
| return NULL; |
| } |
| |
| void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) |
| { |
| spin_lock(&se_global->lu_gps_lock); |
| atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| spin_unlock(&se_global->lu_gps_lock); |
| } |
| |
| /* |
| * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| */ |
| void __core_alua_attach_lu_gp_mem( |
| struct t10_alua_lu_gp_member *lu_gp_mem, |
| struct t10_alua_lu_gp *lu_gp) |
| { |
| spin_lock(&lu_gp->lu_gp_lock); |
| lu_gp_mem->lu_gp = lu_gp; |
| lu_gp_mem->lu_gp_assoc = 1; |
| list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); |
| lu_gp->lu_gp_members++; |
| spin_unlock(&lu_gp->lu_gp_lock); |
| } |
| |
| /* |
| * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| */ |
| void __core_alua_drop_lu_gp_mem( |
| struct t10_alua_lu_gp_member *lu_gp_mem, |
| struct t10_alua_lu_gp *lu_gp) |
| { |
| spin_lock(&lu_gp->lu_gp_lock); |
| list_del(&lu_gp_mem->lu_gp_mem_list); |
| lu_gp_mem->lu_gp = NULL; |
| lu_gp_mem->lu_gp_assoc = 0; |
| lu_gp->lu_gp_members--; |
| spin_unlock(&lu_gp->lu_gp_lock); |
| } |
| |
| struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( |
| struct se_subsystem_dev *su_dev, |
| const char *name, |
| int def_group) |
| { |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| |
| tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); |
| if (!(tg_pt_gp)) { |
| printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp\n"); |
| return NULL; |
| } |
| INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); |
| INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); |
| mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); |
| spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); |
| atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); |
| tg_pt_gp->tg_pt_gp_su_dev = su_dev; |
| tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
| atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); |
| /* |
| * Enable both explict and implict ALUA support by default |
| */ |
| tg_pt_gp->tg_pt_gp_alua_access_type = |
| TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; |
| /* |
| * Set the default Active/NonOptimized Delay in milliseconds |
| */ |
| tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; |
| tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; |
| |
| if (def_group) { |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| tg_pt_gp->tg_pt_gp_id = |
| T10_ALUA(su_dev)->alua_tg_pt_gps_counter++; |
| tg_pt_gp->tg_pt_gp_valid_id = 1; |
| T10_ALUA(su_dev)->alua_tg_pt_gps_count++; |
| list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
| &T10_ALUA(su_dev)->tg_pt_gps_list); |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| } |
| |
| return tg_pt_gp; |
| } |
| |
| int core_alua_set_tg_pt_gp_id( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| u16 tg_pt_gp_id) |
| { |
| struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
| u16 tg_pt_gp_id_tmp; |
| /* |
| * The tg_pt_gp->tg_pt_gp_id may only be set once.. |
| */ |
| if (tg_pt_gp->tg_pt_gp_valid_id) { |
| printk(KERN_WARNING "ALUA TG PT Group already has a valid ID," |
| " ignoring request\n"); |
| return -1; |
| } |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| if (T10_ALUA(su_dev)->alua_tg_pt_gps_count == 0x0000ffff) { |
| printk(KERN_ERR "Maximum ALUA alua_tg_pt_gps_count:" |
| " 0x0000ffff reached\n"); |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
| return -1; |
| } |
| again: |
| tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : |
| T10_ALUA(su_dev)->alua_tg_pt_gps_counter++; |
| |
| list_for_each_entry(tg_pt_gp_tmp, &T10_ALUA(su_dev)->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; |
| |
| printk(KERN_ERR "ALUA Target Port Group ID: %hu already" |
| " exists, ignoring request\n", tg_pt_gp_id); |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| return -1; |
| } |
| } |
| |
| 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, |
| &T10_ALUA(su_dev)->tg_pt_gps_list); |
| T10_ALUA(su_dev)->alua_tg_pt_gps_count++; |
| spin_unlock(&T10_ALUA(su_dev)->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)) { |
| printk(KERN_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; |
| atomic_set(&port->sep_tg_pt_gp_active, 1); |
| |
| return tg_pt_gp_mem; |
| } |
| |
| void core_alua_free_tg_pt_gp( |
| struct t10_alua_tg_pt_gp *tg_pt_gp) |
| { |
| struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
| /* |
| * Once we have reached this point, config_item_put() has already |
| * been called from target_core_alua_drop_tg_pt_gp(). |
| * |
| * Here we remove *tg_pt_gp from the global list so that |
| * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS |
| * can be made while we are releasing struct t10_alua_tg_pt_gp. |
| */ |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| list_del(&tg_pt_gp->tg_pt_gp_list); |
| T10_ALUA(su_dev)->alua_tg_pt_gps_counter--; |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| /* |
| * Allow a struct t10_alua_tg_pt_gp_member * referenced by |
| * core_alua_get_tg_pt_gp_by_name() in |
| * target_core_configfs.c:target_core_store_alua_tg_pt_gp() |
| * to be released with core_alua_put_tg_pt_gp_from_name(). |
| */ |
| while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) |
| cpu_relax(); |
| /* |
| * Release reference to struct t10_alua_tg_pt_gp from all associated |
| * struct se_port. |
| */ |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, |
| &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { |
| if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| tg_pt_gp->tg_pt_gp_members--; |
| tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| } |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| /* |
| * tg_pt_gp_mem is associated with a single |
| * se_port->sep_alua_tg_pt_gp_mem, and is released via |
| * core_alua_free_tg_pt_gp_mem(). |
| * |
| * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, |
| * assume we want to re-assocate a given tg_pt_gp_mem with |
| * default_tg_pt_gp. |
| */ |
| spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| if (tg_pt_gp != T10_ALUA(su_dev)->default_tg_pt_gp) { |
| __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
| T10_ALUA(su_dev)->default_tg_pt_gp); |
| } else |
| tg_pt_gp_mem->tg_pt_gp = NULL; |
| spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| } |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| |
| kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
| } |
| |
| void core_alua_free_tg_pt_gp_mem(struct se_port *port) |
| { |
| struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| struct t10_alua *alua = T10_ALUA(su_dev); |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| |
| if (alua->alua_type != SPC3_ALUA_EMULATED) |
| return; |
| |
| tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| if (!(tg_pt_gp_mem)) |
| return; |
| |
| while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) |
| cpu_relax(); |
| |
| spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| if ((tg_pt_gp)) { |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| tg_pt_gp->tg_pt_gp_members--; |
| tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| } |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| tg_pt_gp_mem->tg_pt_gp = NULL; |
| } |
| spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| |
| kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); |
| } |
| |
| static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( |
| struct se_subsystem_dev *su_dev, |
| const char *name) |
| { |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| struct config_item *ci; |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->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(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| return tg_pt_gp; |
| } |
| } |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| |
| return NULL; |
| } |
| |
| static void core_alua_put_tg_pt_gp_from_name( |
| struct t10_alua_tg_pt_gp *tg_pt_gp) |
| { |
| struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| |
| spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| } |
| |
| /* |
| * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| */ |
| void __core_alua_attach_tg_pt_gp_mem( |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| struct t10_alua_tg_pt_gp *tg_pt_gp) |
| { |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; |
| tg_pt_gp_mem->tg_pt_gp_assoc = 1; |
| list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, |
| &tg_pt_gp->tg_pt_gp_mem_list); |
| tg_pt_gp->tg_pt_gp_members++; |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| } |
| |
| /* |
| * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| */ |
| static void __core_alua_drop_tg_pt_gp_mem( |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| struct t10_alua_tg_pt_gp *tg_pt_gp) |
| { |
| spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| tg_pt_gp_mem->tg_pt_gp = NULL; |
| tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| tg_pt_gp->tg_pt_gp_members--; |
| spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| } |
| |
| ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) |
| { |
| struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| struct config_item *tg_pt_ci; |
| struct t10_alua *alua = T10_ALUA(su_dev); |
| struct t10_alua_tg_pt_gp *tg_pt_gp; |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| ssize_t len = 0; |
| |
| if (alua->alua_type != SPC3_ALUA_EMULATED) |
| return len; |
| |
| tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| if (!(tg_pt_gp_mem)) |
| return len; |
| |
| spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| if ((tg_pt_gp)) { |
| tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
| len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" |
| " %hu\nTG Port Primary Access State: %s\nTG Port " |
| "Primary Access Status: %s\nTG Port Secondary Access" |
| " State: %s\nTG Port Secondary Access Status: %s\n", |
| config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, |
| core_alua_dump_state(atomic_read( |
| &tg_pt_gp->tg_pt_gp_alua_access_state)), |
| core_alua_dump_status( |
| tg_pt_gp->tg_pt_gp_alua_access_status), |
| (atomic_read(&port->sep_tg_pt_secondary_offline)) ? |
| "Offline" : "None", |
| core_alua_dump_status(port->sep_tg_pt_secondary_stat)); |
| } |
| spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| |
| return len; |
| } |
| |
| ssize_t core_alua_store_tg_pt_gp_info( |
| struct se_port *port, |
| const char *page, |
| size_t count) |
| { |
| struct se_portal_group *tpg; |
| struct se_lun *lun; |
| struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| unsigned char buf[TG_PT_GROUP_NAME_BUF]; |
| int move = 0; |
| |
| tpg = port->sep_tpg; |
| lun = port->sep_lun; |
| |
| if (T10_ALUA(su_dev)->alua_type != SPC3_ALUA_EMULATED) { |
| printk(KERN_WARNING "SPC3_ALUA_EMULATED not enabled for" |
| " %s/tpgt_%hu/%s\n", TPG_TFO(tpg)->tpg_get_wwn(tpg), |
| TPG_TFO(tpg)->tpg_get_tag(tpg), |
| config_item_name(&lun->lun_group.cg_item)); |
| return -EINVAL; |
| } |
| |
| if (count > TG_PT_GROUP_NAME_BUF) { |
| printk(KERN_ERR "ALUA Target Port Group alias too large!\n"); |
| return -EINVAL; |
| } |
| memset(buf, 0, TG_PT_GROUP_NAME_BUF); |
| memcpy(buf, page, count); |
| /* |
| * Any ALUA target port group alias besides "NULL" means we will be |
| * making a new group association. |
| */ |
| if (strcmp(strstrip(buf), "NULL")) { |
| /* |
| * core_alua_get_tg_pt_gp_by_name() will increment reference to |
| * struct t10_alua_tg_pt_gp. This reference is released with |
| * core_alua_put_tg_pt_gp_from_name() below. |
| */ |
| tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, |
| strstrip(buf)); |
| if (!(tg_pt_gp_new)) |
| return -ENODEV; |
| } |
| tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| if (!(tg_pt_gp_mem)) { |
| if (tg_pt_gp_new) |
| core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
| printk(KERN_ERR "NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
| return -EINVAL; |
| } |
| |
| spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| if ((tg_pt_gp)) { |
| /* |
| * Clearing an existing tg_pt_gp association, and replacing |
| * with the default_tg_pt_gp. |
| */ |
| if (!(tg_pt_gp_new)) { |
| printk(KERN_INFO "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_TFO(tpg)->tpg_get_wwn(tpg), |
| TPG_TFO(tpg)->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, |
| T10_ALUA(su_dev)->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); |
| printk(KERN_INFO "Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
| " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
| "Moving" : "Adding", TPG_TFO(tpg)->tpg_get_wwn(tpg), |
| TPG_TFO(tpg)->tpg_get_tag(tpg), |
| config_item_name(&lun->lun_group.cg_item), |
| config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), |
| tg_pt_gp_new->tg_pt_gp_id); |
| |
| core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
| return count; |
| } |
| |
| ssize_t core_alua_show_access_type( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| char *page) |
| { |
| if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && |
| (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) |
| return sprintf(page, "Implict and Explict\n"); |
| else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) |
| return sprintf(page, "Implict\n"); |
| else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) |
| return sprintf(page, "Explict\n"); |
| else |
| return sprintf(page, "None\n"); |
| } |
| |
| ssize_t core_alua_store_access_type( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| const char *page, |
| size_t count) |
| { |
| unsigned long tmp; |
| int ret; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract alua_access_type\n"); |
| return -EINVAL; |
| } |
| if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { |
| printk(KERN_ERR "Illegal value for alua_access_type:" |
| " %lu\n", tmp); |
| return -EINVAL; |
| } |
| if (tmp == 3) |
| tg_pt_gp->tg_pt_gp_alua_access_type = |
| TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; |
| else if (tmp == 2) |
| tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; |
| else if (tmp == 1) |
| tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; |
| else |
| tg_pt_gp->tg_pt_gp_alua_access_type = 0; |
| |
| return count; |
| } |
| |
| ssize_t core_alua_show_nonop_delay_msecs( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| char *page) |
| { |
| return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); |
| } |
| |
| ssize_t core_alua_store_nonop_delay_msecs( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| const char *page, |
| size_t count) |
| { |
| unsigned long tmp; |
| int ret; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract nonop_delay_msecs\n"); |
| return -EINVAL; |
| } |
| if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { |
| printk(KERN_ERR "Passed nonop_delay_msecs: %lu, exceeds" |
| " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
| ALUA_MAX_NONOP_DELAY_MSECS); |
| return -EINVAL; |
| } |
| tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; |
| |
| return count; |
| } |
| |
| ssize_t core_alua_show_trans_delay_msecs( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| char *page) |
| { |
| return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| } |
| |
| ssize_t core_alua_store_trans_delay_msecs( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| const char *page, |
| size_t count) |
| { |
| unsigned long tmp; |
| int ret; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract trans_delay_msecs\n"); |
| return -EINVAL; |
| } |
| if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { |
| printk(KERN_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_preferred_bit( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| char *page) |
| { |
| return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); |
| } |
| |
| ssize_t core_alua_store_preferred_bit( |
| struct t10_alua_tg_pt_gp *tg_pt_gp, |
| const char *page, |
| size_t count) |
| { |
| unsigned long tmp; |
| int ret; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract preferred ALUA value\n"); |
| return -EINVAL; |
| } |
| if ((tmp != 0) && (tmp != 1)) { |
| printk(KERN_ERR "Illegal value for preferred ALUA: %lu\n", tmp); |
| return -EINVAL; |
| } |
| tg_pt_gp->tg_pt_gp_pref = (int)tmp; |
| |
| return count; |
| } |
| |
| ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) |
| { |
| if (!(lun->lun_sep)) |
| return -ENODEV; |
| |
| return sprintf(page, "%d\n", |
| atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); |
| } |
| |
| ssize_t core_alua_store_offline_bit( |
| struct se_lun *lun, |
| const char *page, |
| size_t count) |
| { |
| struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| unsigned long tmp; |
| int ret; |
| |
| if (!(lun->lun_sep)) |
| return -ENODEV; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract alua_tg_pt_offline value\n"); |
| return -EINVAL; |
| } |
| if ((tmp != 0) && (tmp != 1)) { |
| printk(KERN_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)) { |
| printk(KERN_ERR "Unable to locate *tg_pt_gp_mem\n"); |
| return -EINVAL; |
| } |
| |
| ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, |
| lun->lun_sep, 0, (int)tmp); |
| if (ret < 0) |
| return -EINVAL; |
| |
| return count; |
| } |
| |
| ssize_t core_alua_show_secondary_status( |
| struct se_lun *lun, |
| char *page) |
| { |
| return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); |
| } |
| |
| ssize_t core_alua_store_secondary_status( |
| struct se_lun *lun, |
| const char *page, |
| size_t count) |
| { |
| unsigned long tmp; |
| int ret; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract alua_tg_pt_status\n"); |
| return -EINVAL; |
| } |
| if ((tmp != ALUA_STATUS_NONE) && |
| (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && |
| (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { |
| printk(KERN_ERR "Illegal value for alua_tg_pt_status: %lu\n", |
| tmp); |
| return -EINVAL; |
| } |
| lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; |
| |
| return count; |
| } |
| |
| ssize_t core_alua_show_secondary_write_metadata( |
| struct se_lun *lun, |
| char *page) |
| { |
| return sprintf(page, "%d\n", |
| lun->lun_sep->sep_tg_pt_secondary_write_md); |
| } |
| |
| ssize_t core_alua_store_secondary_write_metadata( |
| struct se_lun *lun, |
| const char *page, |
| size_t count) |
| { |
| unsigned long tmp; |
| int ret; |
| |
| ret = strict_strtoul(page, 0, &tmp); |
| if (ret < 0) { |
| printk(KERN_ERR "Unable to extract alua_tg_pt_write_md\n"); |
| return -EINVAL; |
| } |
| if ((tmp != 0) && (tmp != 1)) { |
| printk(KERN_ERR "Illegal value for alua_tg_pt_write_md:" |
| " %lu\n", tmp); |
| return -EINVAL; |
| } |
| lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; |
| |
| return count; |
| } |
| |
| int core_setup_alua(struct se_device *dev, int force_pt) |
| { |
| struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| struct t10_alua *alua = T10_ALUA(su_dev); |
| struct t10_alua_lu_gp_member *lu_gp_mem; |
| /* |
| * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic |
| * of the Underlying SCSI hardware. In Linux/SCSI terms, this can |
| * cause a problem because libata and some SATA RAID HBAs appear |
| * under Linux/SCSI, but emulate SCSI logic themselves. |
| */ |
| if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
| !(DEV_ATTRIB(dev)->emulate_alua)) || force_pt) { |
| alua->alua_type = SPC_ALUA_PASSTHROUGH; |
| alua->alua_state_check = &core_alua_state_check_nop; |
| printk(KERN_INFO "%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
| " emulation\n", TRANSPORT(dev)->name); |
| return 0; |
| } |
| /* |
| * If SPC-3 or above is reported by real or emulated struct se_device, |
| * use emulated ALUA. |
| */ |
| if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) { |
| printk(KERN_INFO "%s: Enabling ALUA Emulation for SPC-3" |
| " device\n", TRANSPORT(dev)->name); |
| /* |
| * Associate this struct se_device with the default ALUA |
| * LUN Group. |
| */ |
| lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); |
| if (IS_ERR(lu_gp_mem) || !lu_gp_mem) |
| return -1; |
| |
| alua->alua_type = SPC3_ALUA_EMULATED; |
| alua->alua_state_check = &core_alua_state_check; |
| spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| __core_alua_attach_lu_gp_mem(lu_gp_mem, |
| se_global->default_lu_gp); |
| spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| |
| printk(KERN_INFO "%s: Adding to default ALUA LU Group:" |
| " core/alua/lu_gps/default_lu_gp\n", |
| TRANSPORT(dev)->name); |
| } else { |
| alua->alua_type = SPC2_ALUA_DISABLED; |
| alua->alua_state_check = &core_alua_state_check_nop; |
| printk(KERN_INFO "%s: Disabling ALUA Emulation for SPC-2" |
| " device\n", TRANSPORT(dev)->name); |
| } |
| |
| return 0; |
| } |