Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_alua.c |
| 3 | * |
| 4 | * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) |
| 5 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 6 | * (c) Copyright 2009-2013 Datera, Inc. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 7 | * |
| 8 | * Nicholas A. Bellinger <nab@kernel.org> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | * |
| 24 | ******************************************************************************/ |
| 25 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 26 | #include <linux/slab.h> |
| 27 | #include <linux/spinlock.h> |
| 28 | #include <linux/configfs.h> |
Paul Gortmaker | c53181a | 2011-08-30 18:16:43 -0400 | [diff] [blame] | 29 | #include <linux/export.h> |
Al Viro | 0e9b10a | 2013-02-23 15:22:43 -0500 | [diff] [blame] | 30 | #include <linux/file.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 31 | #include <scsi/scsi.h> |
| 32 | #include <scsi/scsi_cmnd.h> |
Roland Dreier | 33395fb | 2012-02-23 17:22:12 -0800 | [diff] [blame] | 33 | #include <asm/unaligned.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 34 | |
| 35 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 36 | #include <target/target_core_backend.h> |
| 37 | #include <target/target_core_fabric.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 38 | #include <target/target_core_configfs.h> |
| 39 | |
Christoph Hellwig | e26d99a | 2011-11-14 12:30:30 -0500 | [diff] [blame] | 40 | #include "target_core_internal.h" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 41 | #include "target_core_alua.h" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 42 | #include "target_core_ua.h" |
| 43 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 44 | static sense_reason_t core_alua_check_transition(int state, int *primary); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 45 | static int core_alua_set_tg_pt_secondary_state( |
| 46 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 47 | struct se_port *port, int explict, int offline); |
| 48 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 49 | static u16 alua_lu_gps_counter; |
| 50 | static u32 alua_lu_gps_count; |
| 51 | |
| 52 | static DEFINE_SPINLOCK(lu_gps_lock); |
| 53 | static LIST_HEAD(lu_gps_list); |
| 54 | |
| 55 | struct t10_alua_lu_gp *default_lu_gp; |
| 56 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 57 | /* |
| 58 | * REPORT_TARGET_PORT_GROUPS |
| 59 | * |
| 60 | * See spc4r17 section 6.27 |
| 61 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 62 | sense_reason_t |
| 63 | target_emulate_report_target_port_groups(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 64 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 65 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 66 | struct se_port *port; |
| 67 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 68 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 69 | unsigned char *buf; |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 70 | u32 rd_len = 0, off; |
| 71 | int ext_hdr = (cmd->t_task_cdb[1] & 0x20); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 72 | |
Nicholas Bellinger | 6b20fa9 | 2011-10-18 23:48:04 -0700 | [diff] [blame] | 73 | /* |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 74 | * Skip over RESERVED area to first Target port group descriptor |
| 75 | * depending on the PARAMETER DATA FORMAT type.. |
Nicholas Bellinger | 6b20fa9 | 2011-10-18 23:48:04 -0700 | [diff] [blame] | 76 | */ |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 77 | if (ext_hdr != 0) |
| 78 | off = 8; |
| 79 | else |
| 80 | off = 4; |
| 81 | |
| 82 | if (cmd->data_length < off) { |
| 83 | pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" |
| 84 | " small for %s header\n", cmd->data_length, |
| 85 | (ext_hdr) ? "extended" : "normal"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 86 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 6b20fa9 | 2011-10-18 23:48:04 -0700 | [diff] [blame] | 87 | } |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 88 | buf = transport_kmap_data_sg(cmd); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 89 | if (!buf) |
| 90 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 91 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 92 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
| 93 | list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 94 | tg_pt_gp_list) { |
| 95 | /* |
Nicholas Bellinger | 6b20fa9 | 2011-10-18 23:48:04 -0700 | [diff] [blame] | 96 | * Check if the Target port group and Target port descriptor list |
| 97 | * based on tg_pt_gp_members count will fit into the response payload. |
| 98 | * Otherwise, bump rd_len to let the initiator know we have exceeded |
| 99 | * the allocation length and the response is truncated. |
| 100 | */ |
| 101 | if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > |
| 102 | cmd->data_length) { |
| 103 | rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); |
| 104 | continue; |
| 105 | } |
| 106 | /* |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 107 | * PREF: Preferred target port bit, determine if this |
| 108 | * bit should be set for port group. |
| 109 | */ |
| 110 | if (tg_pt_gp->tg_pt_gp_pref) |
| 111 | buf[off] = 0x80; |
| 112 | /* |
| 113 | * Set the ASYMMETRIC ACCESS State |
| 114 | */ |
| 115 | buf[off++] |= (atomic_read( |
| 116 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); |
| 117 | /* |
| 118 | * Set supported ASYMMETRIC ACCESS State bits |
| 119 | */ |
| 120 | buf[off] = 0x80; /* T_SUP */ |
| 121 | buf[off] |= 0x40; /* O_SUP */ |
| 122 | buf[off] |= 0x8; /* U_SUP */ |
| 123 | buf[off] |= 0x4; /* S_SUP */ |
| 124 | buf[off] |= 0x2; /* AN_SUP */ |
| 125 | buf[off++] |= 0x1; /* AO_SUP */ |
| 126 | /* |
| 127 | * TARGET PORT GROUP |
| 128 | */ |
| 129 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); |
| 130 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); |
| 131 | |
| 132 | off++; /* Skip over Reserved */ |
| 133 | /* |
| 134 | * STATUS CODE |
| 135 | */ |
| 136 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); |
| 137 | /* |
| 138 | * Vendor Specific field |
| 139 | */ |
| 140 | buf[off++] = 0x00; |
| 141 | /* |
| 142 | * TARGET PORT COUNT |
| 143 | */ |
| 144 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); |
| 145 | rd_len += 8; |
| 146 | |
| 147 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 148 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| 149 | tg_pt_gp_mem_list) { |
| 150 | port = tg_pt_gp_mem->tg_pt; |
| 151 | /* |
| 152 | * Start Target Port descriptor format |
| 153 | * |
| 154 | * See spc4r17 section 6.2.7 Table 247 |
| 155 | */ |
| 156 | off += 2; /* Skip over Obsolete */ |
| 157 | /* |
| 158 | * Set RELATIVE TARGET PORT IDENTIFIER |
| 159 | */ |
| 160 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); |
| 161 | buf[off++] = (port->sep_rtpi & 0xff); |
| 162 | rd_len += 4; |
| 163 | } |
| 164 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 165 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 166 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 167 | /* |
| 168 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload |
| 169 | */ |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 170 | put_unaligned_be32(rd_len, &buf[0]); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 171 | |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 172 | /* |
| 173 | * Fill in the Extended header parameter data format if requested |
| 174 | */ |
| 175 | if (ext_hdr != 0) { |
| 176 | buf[4] = 0x10; |
| 177 | /* |
| 178 | * Set the implict transition time (in seconds) for the application |
| 179 | * client to use as a base for it's transition timeout value. |
| 180 | * |
| 181 | * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN |
| 182 | * this CDB was received upon to determine this value individually |
| 183 | * for ALUA target port group. |
| 184 | */ |
| 185 | port = cmd->se_lun->lun_sep; |
| 186 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 187 | if (tg_pt_gp_mem) { |
| 188 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 189 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 190 | if (tg_pt_gp) |
| 191 | buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs; |
| 192 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 193 | } |
| 194 | } |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 195 | transport_kunmap_data_sg(cmd); |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 196 | |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame] | 197 | target_complete_cmd(cmd, GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. |
| 203 | * |
| 204 | * See spc4r17 section 6.35 |
| 205 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 206 | sense_reason_t |
| 207 | target_emulate_set_target_port_groups(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 208 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 209 | struct se_device *dev = cmd->se_dev; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 210 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; |
| 211 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 212 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
| 213 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 214 | unsigned char *buf; |
| 215 | unsigned char *ptr; |
Hannes Reinecke | a0d50f6 | 2012-12-17 09:53:34 +0100 | [diff] [blame] | 216 | sense_reason_t rc = TCM_NO_SENSE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 217 | u32 len = 4; /* Skip over RESERVED area in header */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 218 | int alua_access_state, primary = 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 219 | u16 tg_pt_id, rtpi; |
| 220 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 221 | if (!l_port) |
| 222 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 223 | |
Paolo Bonzini | 0d7f129 | 2012-09-07 17:30:33 +0200 | [diff] [blame] | 224 | if (cmd->data_length < 4) { |
| 225 | pr_warn("SET TARGET PORT GROUPS parameter list length %u too" |
| 226 | " small\n", cmd->data_length); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 227 | return TCM_INVALID_PARAMETER_LIST; |
Paolo Bonzini | 0d7f129 | 2012-09-07 17:30:33 +0200 | [diff] [blame] | 228 | } |
| 229 | |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 230 | buf = transport_kmap_data_sg(cmd); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 231 | if (!buf) |
| 232 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 233 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 234 | /* |
| 235 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed |
| 236 | * for the local tg_pt_gp. |
| 237 | */ |
| 238 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 239 | if (!l_tg_pt_gp_mem) { |
| 240 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 241 | rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 242 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 243 | } |
| 244 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 245 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 246 | if (!l_tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 247 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 248 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 249 | rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 250 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 251 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 252 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 253 | |
Nicholas Bellinger | a2e85d1 | 2012-11-06 12:36:12 -0800 | [diff] [blame] | 254 | if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 255 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 256 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 257 | rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 258 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 259 | } |
| 260 | |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 261 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
| 262 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 263 | while (len < cmd->data_length) { |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 264 | bool found = false; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 265 | alua_access_state = (ptr[0] & 0x0f); |
| 266 | /* |
| 267 | * Check the received ALUA access state, and determine if |
| 268 | * the state is a primary or secondary target port asymmetric |
| 269 | * access state. |
| 270 | */ |
| 271 | rc = core_alua_check_transition(alua_access_state, &primary); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 272 | if (rc) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 273 | /* |
| 274 | * If the SET TARGET PORT GROUPS attempts to establish |
| 275 | * an invalid combination of target port asymmetric |
| 276 | * access states or attempts to establish an |
| 277 | * unsupported target port asymmetric access state, |
| 278 | * then the command shall be terminated with CHECK |
| 279 | * CONDITION status, with the sense key set to ILLEGAL |
| 280 | * REQUEST, and the additional sense code set to INVALID |
| 281 | * FIELD IN PARAMETER LIST. |
| 282 | */ |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 283 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 284 | } |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 285 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 286 | /* |
| 287 | * If the ASYMMETRIC ACCESS STATE field (see table 267) |
| 288 | * specifies a primary target port asymmetric access state, |
| 289 | * then the TARGET PORT GROUP OR TARGET PORT field specifies |
| 290 | * a primary target port group for which the primary target |
| 291 | * port asymmetric access state shall be changed. If the |
| 292 | * ASYMMETRIC ACCESS STATE field specifies a secondary target |
| 293 | * port asymmetric access state, then the TARGET PORT GROUP OR |
| 294 | * TARGET PORT field specifies the relative target port |
| 295 | * identifier (see 3.1.120) of the target port for which the |
| 296 | * secondary target port asymmetric access state shall be |
| 297 | * changed. |
| 298 | */ |
| 299 | if (primary) { |
Roland Dreier | 33395fb | 2012-02-23 17:22:12 -0800 | [diff] [blame] | 300 | tg_pt_id = get_unaligned_be16(ptr + 2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 301 | /* |
| 302 | * Locate the matching target port group ID from |
| 303 | * the global tg_pt_gp list |
| 304 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 305 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 306 | list_for_each_entry(tg_pt_gp, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 307 | &dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 308 | tg_pt_gp_list) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 309 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 310 | continue; |
| 311 | |
| 312 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) |
| 313 | continue; |
| 314 | |
| 315 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 316 | smp_mb__after_atomic_inc(); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 317 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 318 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 319 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 320 | if (!core_alua_do_port_transition(tg_pt_gp, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 321 | dev, l_port, nacl, |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 322 | alua_access_state, 1)) |
| 323 | found = true; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 324 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 325 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 326 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 327 | smp_mb__after_atomic_dec(); |
| 328 | break; |
| 329 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 330 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 331 | } else { |
| 332 | /* |
| 333 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify |
| 334 | * the Target Port in question for the the incoming |
| 335 | * SET_TARGET_PORT_GROUPS op. |
| 336 | */ |
Roland Dreier | 33395fb | 2012-02-23 17:22:12 -0800 | [diff] [blame] | 337 | rtpi = get_unaligned_be16(ptr + 2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 338 | /* |
Masanari Iida | 35d1efe | 2012-08-16 22:43:13 +0900 | [diff] [blame] | 339 | * Locate the matching relative target port identifier |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 340 | * for the struct se_device storage object. |
| 341 | */ |
| 342 | spin_lock(&dev->se_port_lock); |
| 343 | list_for_each_entry(port, &dev->dev_sep_list, |
| 344 | sep_list) { |
| 345 | if (port->sep_rtpi != rtpi) |
| 346 | continue; |
| 347 | |
| 348 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 349 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 350 | spin_unlock(&dev->se_port_lock); |
| 351 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 352 | if (!core_alua_set_tg_pt_secondary_state( |
| 353 | tg_pt_gp_mem, port, 1, 1)) |
| 354 | found = true; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 355 | |
| 356 | spin_lock(&dev->se_port_lock); |
| 357 | break; |
| 358 | } |
| 359 | spin_unlock(&dev->se_port_lock); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | if (!found) { |
| 363 | rc = TCM_INVALID_PARAMETER_LIST; |
| 364 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | ptr += 4; |
| 368 | len += 4; |
| 369 | } |
| 370 | |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 371 | out: |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 372 | transport_kunmap_data_sg(cmd); |
Roland Dreier | 59e4f54 | 2012-06-04 23:24:51 -0700 | [diff] [blame] | 373 | if (!rc) |
| 374 | target_complete_cmd(cmd, GOOD); |
| 375 | return rc; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | static inline int core_alua_state_nonoptimized( |
| 379 | struct se_cmd *cmd, |
| 380 | unsigned char *cdb, |
| 381 | int nonop_delay_msecs, |
| 382 | u8 *alua_ascq) |
| 383 | { |
| 384 | /* |
| 385 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked |
| 386 | * later to determine if processing of this cmd needs to be |
| 387 | * temporarily delayed for the Active/NonOptimized primary access state. |
| 388 | */ |
| 389 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; |
| 390 | cmd->alua_nonop_delay = nonop_delay_msecs; |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | static inline int core_alua_state_standby( |
| 395 | struct se_cmd *cmd, |
| 396 | unsigned char *cdb, |
| 397 | u8 *alua_ascq) |
| 398 | { |
| 399 | /* |
| 400 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by |
| 401 | * spc4r17 section 5.9.2.4.4 |
| 402 | */ |
| 403 | switch (cdb[0]) { |
| 404 | case INQUIRY: |
| 405 | case LOG_SELECT: |
| 406 | case LOG_SENSE: |
| 407 | case MODE_SELECT: |
| 408 | case MODE_SENSE: |
| 409 | case REPORT_LUNS: |
| 410 | case RECEIVE_DIAGNOSTIC: |
| 411 | case SEND_DIAGNOSTIC: |
Nicholas Bellinger | 30f359a | 2013-04-10 15:00:27 -0700 | [diff] [blame] | 412 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 413 | case MAINTENANCE_IN: |
Nicholas Bellinger | ba53974 | 2012-05-16 21:52:10 -0700 | [diff] [blame] | 414 | switch (cdb[1] & 0x1f) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 415 | case MI_REPORT_TARGET_PGS: |
| 416 | return 0; |
| 417 | default: |
| 418 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 419 | return 1; |
| 420 | } |
| 421 | case MAINTENANCE_OUT: |
| 422 | switch (cdb[1]) { |
| 423 | case MO_SET_TARGET_PGS: |
| 424 | return 0; |
| 425 | default: |
| 426 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 427 | return 1; |
| 428 | } |
| 429 | case REQUEST_SENSE: |
| 430 | case PERSISTENT_RESERVE_IN: |
| 431 | case PERSISTENT_RESERVE_OUT: |
| 432 | case READ_BUFFER: |
| 433 | case WRITE_BUFFER: |
| 434 | return 0; |
| 435 | default: |
| 436 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 437 | return 1; |
| 438 | } |
| 439 | |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | static inline int core_alua_state_unavailable( |
| 444 | struct se_cmd *cmd, |
| 445 | unsigned char *cdb, |
| 446 | u8 *alua_ascq) |
| 447 | { |
| 448 | /* |
| 449 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by |
| 450 | * spc4r17 section 5.9.2.4.5 |
| 451 | */ |
| 452 | switch (cdb[0]) { |
| 453 | case INQUIRY: |
| 454 | case REPORT_LUNS: |
Nicholas Bellinger | 30f359a | 2013-04-10 15:00:27 -0700 | [diff] [blame] | 455 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 456 | case MAINTENANCE_IN: |
Nicholas Bellinger | ba53974 | 2012-05-16 21:52:10 -0700 | [diff] [blame] | 457 | switch (cdb[1] & 0x1f) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 458 | case MI_REPORT_TARGET_PGS: |
| 459 | return 0; |
| 460 | default: |
| 461 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 462 | return 1; |
| 463 | } |
| 464 | case MAINTENANCE_OUT: |
| 465 | switch (cdb[1]) { |
| 466 | case MO_SET_TARGET_PGS: |
| 467 | return 0; |
| 468 | default: |
| 469 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 470 | return 1; |
| 471 | } |
| 472 | case REQUEST_SENSE: |
| 473 | case READ_BUFFER: |
| 474 | case WRITE_BUFFER: |
| 475 | return 0; |
| 476 | default: |
| 477 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 478 | return 1; |
| 479 | } |
| 480 | |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | static inline int core_alua_state_transition( |
| 485 | struct se_cmd *cmd, |
| 486 | unsigned char *cdb, |
| 487 | u8 *alua_ascq) |
| 488 | { |
| 489 | /* |
| 490 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by |
| 491 | * spc4r17 section 5.9.2.5 |
| 492 | */ |
| 493 | switch (cdb[0]) { |
| 494 | case INQUIRY: |
| 495 | case REPORT_LUNS: |
Nicholas Bellinger | 30f359a | 2013-04-10 15:00:27 -0700 | [diff] [blame] | 496 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 497 | case MAINTENANCE_IN: |
Nicholas Bellinger | ba53974 | 2012-05-16 21:52:10 -0700 | [diff] [blame] | 498 | switch (cdb[1] & 0x1f) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 499 | case MI_REPORT_TARGET_PGS: |
| 500 | return 0; |
| 501 | default: |
| 502 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| 503 | return 1; |
| 504 | } |
| 505 | case REQUEST_SENSE: |
| 506 | case READ_BUFFER: |
| 507 | case WRITE_BUFFER: |
| 508 | return 0; |
| 509 | default: |
| 510 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| 511 | return 1; |
| 512 | } |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | /* |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 518 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
| 519 | * return 0: Used to signal success |
| 520 | * reutrn -1: Used to signal failure, and invalid cdb field |
| 521 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 522 | sense_reason_t |
| 523 | target_alua_state_check(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 524 | { |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 525 | struct se_device *dev = cmd->se_dev; |
| 526 | unsigned char *cdb = cmd->t_task_cdb; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 527 | struct se_lun *lun = cmd->se_lun; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 528 | struct se_port *port = lun->lun_sep; |
| 529 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 530 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 531 | int out_alua_state, nonop_delay_msecs; |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 532 | u8 alua_ascq; |
| 533 | int ret; |
| 534 | |
| 535 | if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) |
| 536 | return 0; |
| 537 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
| 538 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 539 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 540 | if (!port) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 541 | return 0; |
| 542 | /* |
| 543 | * First, check for a struct se_port specific secondary ALUA target port |
| 544 | * access state: OFFLINE |
| 545 | */ |
| 546 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 547 | pr_debug("ALUA: Got secondary offline status for local" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 548 | " target port\n"); |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 549 | alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
| 550 | ret = 1; |
| 551 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 552 | } |
| 553 | /* |
| 554 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the |
| 555 | * ALUA target port group, to obtain current ALUA access state. |
| 556 | * Otherwise look for the underlying struct se_device association with |
| 557 | * a ALUA logical unit group. |
| 558 | */ |
| 559 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Nicholas Bellinger | 89c12cc | 2013-08-22 15:35:45 -0700 | [diff] [blame] | 560 | if (!tg_pt_gp_mem) |
| 561 | return 0; |
| 562 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 563 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 564 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 565 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| 566 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; |
| 567 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 568 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 569 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
| 570 | * statement so the compiler knows explicitly to check this case first. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 571 | * For the Optimized ALUA access state case, we want to process the |
| 572 | * incoming fabric cmd ASAP.. |
| 573 | */ |
| 574 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) |
| 575 | return 0; |
| 576 | |
| 577 | switch (out_alua_state) { |
| 578 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 579 | ret = core_alua_state_nonoptimized(cmd, cdb, |
| 580 | nonop_delay_msecs, &alua_ascq); |
| 581 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 582 | case ALUA_ACCESS_STATE_STANDBY: |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 583 | ret = core_alua_state_standby(cmd, cdb, &alua_ascq); |
| 584 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 585 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 586 | ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); |
| 587 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 588 | case ALUA_ACCESS_STATE_TRANSITION: |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 589 | ret = core_alua_state_transition(cmd, cdb, &alua_ascq); |
| 590 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 591 | /* |
| 592 | * OFFLINE is a secondary ALUA target port group access state, that is |
| 593 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 |
| 594 | */ |
| 595 | case ALUA_ACCESS_STATE_OFFLINE: |
| 596 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 597 | pr_err("Unknown ALUA access state: 0x%02x\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 598 | out_alua_state); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 599 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 600 | } |
| 601 | |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 602 | out: |
| 603 | if (ret > 0) { |
| 604 | /* |
| 605 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
| 606 | * The ALUA additional sense code qualifier (ASCQ) is determined |
| 607 | * by the ALUA primary or secondary access state.. |
| 608 | */ |
| 609 | pr_debug("[%s]: ALUA TG Port not available, " |
| 610 | "SenseKey: NOT_READY, ASC/ASCQ: " |
| 611 | "0x04/0x%02x\n", |
| 612 | cmd->se_tfo->get_fabric_name(), alua_ascq); |
| 613 | |
| 614 | cmd->scsi_asc = 0x04; |
| 615 | cmd->scsi_ascq = alua_ascq; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 616 | return TCM_CHECK_CONDITION_NOT_READY; |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 617 | } |
| 618 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 619 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | /* |
| 623 | * Check implict and explict ALUA state change request. |
| 624 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 625 | static sense_reason_t |
| 626 | core_alua_check_transition(int state, int *primary) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 627 | { |
| 628 | switch (state) { |
| 629 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| 630 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 631 | case ALUA_ACCESS_STATE_STANDBY: |
| 632 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 633 | /* |
| 634 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are |
| 635 | * defined as primary target port asymmetric access states. |
| 636 | */ |
| 637 | *primary = 1; |
| 638 | break; |
| 639 | case ALUA_ACCESS_STATE_OFFLINE: |
| 640 | /* |
| 641 | * OFFLINE state is defined as a secondary target port |
| 642 | * asymmetric access state. |
| 643 | */ |
| 644 | *primary = 0; |
| 645 | break; |
| 646 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 647 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 648 | return TCM_INVALID_PARAMETER_LIST; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 649 | } |
| 650 | |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | static char *core_alua_dump_state(int state) |
| 655 | { |
| 656 | switch (state) { |
| 657 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| 658 | return "Active/Optimized"; |
| 659 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 660 | return "Active/NonOptimized"; |
| 661 | case ALUA_ACCESS_STATE_STANDBY: |
| 662 | return "Standby"; |
| 663 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 664 | return "Unavailable"; |
| 665 | case ALUA_ACCESS_STATE_OFFLINE: |
| 666 | return "Offline"; |
| 667 | default: |
| 668 | return "Unknown"; |
| 669 | } |
| 670 | |
| 671 | return NULL; |
| 672 | } |
| 673 | |
| 674 | char *core_alua_dump_status(int status) |
| 675 | { |
| 676 | switch (status) { |
| 677 | case ALUA_STATUS_NONE: |
| 678 | return "None"; |
| 679 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: |
| 680 | return "Altered by Explict STPG"; |
| 681 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: |
| 682 | return "Altered by Implict ALUA"; |
| 683 | default: |
| 684 | return "Unknown"; |
| 685 | } |
| 686 | |
| 687 | return NULL; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Used by fabric modules to determine when we need to delay processing |
| 692 | * for the Active/NonOptimized paths.. |
| 693 | */ |
| 694 | int core_alua_check_nonop_delay( |
| 695 | struct se_cmd *cmd) |
| 696 | { |
| 697 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) |
| 698 | return 0; |
| 699 | if (in_interrupt()) |
| 700 | return 0; |
| 701 | /* |
| 702 | * The ALUA Active/NonOptimized access state delay can be disabled |
| 703 | * in via configfs with a value of zero |
| 704 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 705 | if (!cmd->alua_nonop_delay) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 706 | return 0; |
| 707 | /* |
| 708 | * struct se_cmd->alua_nonop_delay gets set by a target port group |
| 709 | * defined interval in core_alua_state_nonoptimized() |
| 710 | */ |
| 711 | msleep_interruptible(cmd->alua_nonop_delay); |
| 712 | return 0; |
| 713 | } |
| 714 | EXPORT_SYMBOL(core_alua_check_nonop_delay); |
| 715 | |
| 716 | /* |
| 717 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex |
| 718 | * |
| 719 | */ |
| 720 | static int core_alua_write_tpg_metadata( |
| 721 | const char *path, |
| 722 | unsigned char *md_buf, |
| 723 | u32 md_buf_len) |
| 724 | { |
Al Viro | 0e9b10a | 2013-02-23 15:22:43 -0500 | [diff] [blame] | 725 | struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); |
| 726 | int ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 727 | |
Al Viro | 0e9b10a | 2013-02-23 15:22:43 -0500 | [diff] [blame] | 728 | if (IS_ERR(file)) { |
| 729 | pr_err("filp_open(%s) for ALUA metadata failed\n", path); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 730 | return -ENODEV; |
| 731 | } |
Al Viro | 0e9b10a | 2013-02-23 15:22:43 -0500 | [diff] [blame] | 732 | ret = kernel_write(file, md_buf, md_buf_len, 0); |
| 733 | if (ret < 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 734 | pr_err("Error writing ALUA metadata file: %s\n", path); |
Al Viro | 0e9b10a | 2013-02-23 15:22:43 -0500 | [diff] [blame] | 735 | fput(file); |
Gera Kazakov | f730f91 | 2013-09-09 15:47:06 -0700 | [diff] [blame] | 736 | return (ret < 0) ? -EIO : 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | /* |
| 740 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held |
| 741 | */ |
| 742 | static int core_alua_update_tpg_primary_metadata( |
| 743 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 744 | int primary_state, |
| 745 | unsigned char *md_buf) |
| 746 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 747 | struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 748 | char path[ALUA_METADATA_PATH_LEN]; |
| 749 | int len; |
| 750 | |
| 751 | memset(path, 0, ALUA_METADATA_PATH_LEN); |
| 752 | |
| 753 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, |
| 754 | "tg_pt_gp_id=%hu\n" |
| 755 | "alua_access_state=0x%02x\n" |
| 756 | "alua_access_status=0x%02x\n", |
| 757 | tg_pt_gp->tg_pt_gp_id, primary_state, |
| 758 | tg_pt_gp->tg_pt_gp_alua_access_status); |
| 759 | |
| 760 | snprintf(path, ALUA_METADATA_PATH_LEN, |
| 761 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], |
| 762 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); |
| 763 | |
| 764 | return core_alua_write_tpg_metadata(path, md_buf, len); |
| 765 | } |
| 766 | |
| 767 | static int core_alua_do_transition_tg_pt( |
| 768 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 769 | struct se_port *l_port, |
| 770 | struct se_node_acl *nacl, |
| 771 | unsigned char *md_buf, |
| 772 | int new_state, |
| 773 | int explict) |
| 774 | { |
| 775 | struct se_dev_entry *se_deve; |
| 776 | struct se_lun_acl *lacl; |
| 777 | struct se_port *port; |
| 778 | struct t10_alua_tg_pt_gp_member *mem; |
| 779 | int old_state = 0; |
| 780 | /* |
| 781 | * Save the old primary ALUA access state, and set the current state |
| 782 | * to ALUA_ACCESS_STATE_TRANSITION. |
| 783 | */ |
| 784 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| 785 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| 786 | ALUA_ACCESS_STATE_TRANSITION); |
| 787 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? |
| 788 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| 789 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| 790 | /* |
| 791 | * Check for the optional ALUA primary state transition delay |
| 792 | */ |
| 793 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) |
| 794 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| 795 | |
| 796 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 797 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| 798 | tg_pt_gp_mem_list) { |
| 799 | port = mem->tg_pt; |
| 800 | /* |
| 801 | * After an implicit target port asymmetric access state |
| 802 | * change, a device server shall establish a unit attention |
| 803 | * condition for the initiator port associated with every I_T |
| 804 | * nexus with the additional sense code set to ASYMMETRIC |
| 805 | * ACCESS STATE CHAGED. |
| 806 | * |
| 807 | * After an explicit target port asymmetric access state |
| 808 | * change, a device server shall establish a unit attention |
| 809 | * condition with the additional sense code set to ASYMMETRIC |
| 810 | * ACCESS STATE CHANGED for the initiator port associated with |
| 811 | * every I_T nexus other than the I_T nexus on which the SET |
| 812 | * TARGET PORT GROUPS command |
| 813 | */ |
| 814 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); |
| 815 | smp_mb__after_atomic_inc(); |
| 816 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 817 | |
| 818 | spin_lock_bh(&port->sep_alua_lock); |
| 819 | list_for_each_entry(se_deve, &port->sep_alua_list, |
| 820 | alua_port_list) { |
| 821 | lacl = se_deve->se_lun_acl; |
| 822 | /* |
| 823 | * se_deve->se_lun_acl pointer may be NULL for a |
| 824 | * entry created without explict Node+MappedLUN ACLs |
| 825 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 826 | if (!lacl) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 827 | continue; |
| 828 | |
| 829 | if (explict && |
| 830 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && |
| 831 | (l_port != NULL) && (l_port == port)) |
| 832 | continue; |
| 833 | |
| 834 | core_scsi3_ua_allocate(lacl->se_lun_nacl, |
| 835 | se_deve->mapped_lun, 0x2A, |
| 836 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); |
| 837 | } |
| 838 | spin_unlock_bh(&port->sep_alua_lock); |
| 839 | |
| 840 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 841 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); |
| 842 | smp_mb__after_atomic_dec(); |
| 843 | } |
| 844 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 845 | /* |
| 846 | * Update the ALUA metadata buf that has been allocated in |
| 847 | * core_alua_do_port_transition(), this metadata will be written |
| 848 | * to struct file. |
| 849 | * |
| 850 | * Note that there is the case where we do not want to update the |
| 851 | * metadata when the saved metadata is being parsed in userspace |
| 852 | * when setting the existing port access state and access status. |
| 853 | * |
| 854 | * Also note that the failure to write out the ALUA metadata to |
| 855 | * struct file does NOT affect the actual ALUA transition. |
| 856 | */ |
| 857 | if (tg_pt_gp->tg_pt_gp_write_metadata) { |
| 858 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 859 | core_alua_update_tpg_primary_metadata(tg_pt_gp, |
| 860 | new_state, md_buf); |
| 861 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 862 | } |
| 863 | /* |
| 864 | * Set the current primary ALUA access state to the requested new state |
| 865 | */ |
| 866 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); |
| 867 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 868 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 869 | " from primary access state %s to %s\n", (explict) ? "explict" : |
| 870 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| 871 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), |
| 872 | core_alua_dump_state(new_state)); |
| 873 | |
| 874 | return 0; |
| 875 | } |
| 876 | |
| 877 | int core_alua_do_port_transition( |
| 878 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, |
| 879 | struct se_device *l_dev, |
| 880 | struct se_port *l_port, |
| 881 | struct se_node_acl *l_nacl, |
| 882 | int new_state, |
| 883 | int explict) |
| 884 | { |
| 885 | struct se_device *dev; |
| 886 | struct se_port *port; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 887 | struct se_node_acl *nacl; |
| 888 | struct t10_alua_lu_gp *lu_gp; |
| 889 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; |
| 890 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 891 | unsigned char *md_buf; |
| 892 | int primary; |
| 893 | |
| 894 | if (core_alua_check_transition(new_state, &primary) != 0) |
| 895 | return -EINVAL; |
| 896 | |
| 897 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 898 | if (!md_buf) { |
| 899 | pr_err("Unable to allocate buf for ALUA metadata\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 900 | return -ENOMEM; |
| 901 | } |
| 902 | |
| 903 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; |
| 904 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); |
| 905 | lu_gp = local_lu_gp_mem->lu_gp; |
| 906 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
| 907 | smp_mb__after_atomic_inc(); |
| 908 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); |
| 909 | /* |
| 910 | * For storage objects that are members of the 'default_lu_gp', |
| 911 | * we only do transition on the passed *l_tp_pt_gp, and not |
| 912 | * on all of the matching target port groups IDs in default_lu_gp. |
| 913 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 914 | if (!lu_gp->lu_gp_id) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 915 | /* |
| 916 | * core_alua_do_transition_tg_pt() will always return |
| 917 | * success. |
| 918 | */ |
| 919 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, |
| 920 | md_buf, new_state, explict); |
| 921 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 922 | smp_mb__after_atomic_dec(); |
| 923 | kfree(md_buf); |
| 924 | return 0; |
| 925 | } |
| 926 | /* |
| 927 | * For all other LU groups aside from 'default_lu_gp', walk all of |
| 928 | * the associated storage objects looking for a matching target port |
| 929 | * group ID from the local target port group. |
| 930 | */ |
| 931 | spin_lock(&lu_gp->lu_gp_lock); |
| 932 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, |
| 933 | lu_gp_mem_list) { |
| 934 | |
| 935 | dev = lu_gp_mem->lu_gp_mem_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 936 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| 937 | smp_mb__after_atomic_inc(); |
| 938 | spin_unlock(&lu_gp->lu_gp_lock); |
| 939 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 940 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 941 | list_for_each_entry(tg_pt_gp, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 942 | &dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 943 | tg_pt_gp_list) { |
| 944 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 945 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 946 | continue; |
| 947 | /* |
| 948 | * If the target behavior port asymmetric access state |
| 949 | * is changed for any target port group accessiable via |
| 950 | * a logical unit within a LU group, the target port |
| 951 | * behavior group asymmetric access states for the same |
| 952 | * target port group accessible via other logical units |
| 953 | * in that LU group will also change. |
| 954 | */ |
| 955 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) |
| 956 | continue; |
| 957 | |
| 958 | if (l_tg_pt_gp == tg_pt_gp) { |
| 959 | port = l_port; |
| 960 | nacl = l_nacl; |
| 961 | } else { |
| 962 | port = NULL; |
| 963 | nacl = NULL; |
| 964 | } |
| 965 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 966 | smp_mb__after_atomic_inc(); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 967 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 968 | /* |
| 969 | * core_alua_do_transition_tg_pt() will always return |
| 970 | * success. |
| 971 | */ |
| 972 | core_alua_do_transition_tg_pt(tg_pt_gp, port, |
| 973 | nacl, md_buf, new_state, explict); |
| 974 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 975 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 976 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 977 | smp_mb__after_atomic_dec(); |
| 978 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 979 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 980 | |
| 981 | spin_lock(&lu_gp->lu_gp_lock); |
| 982 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| 983 | smp_mb__after_atomic_dec(); |
| 984 | } |
| 985 | spin_unlock(&lu_gp->lu_gp_lock); |
| 986 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 987 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 988 | " Group IDs: %hu %s transition to primary state: %s\n", |
| 989 | config_item_name(&lu_gp->lu_gp_group.cg_item), |
| 990 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", |
| 991 | core_alua_dump_state(new_state)); |
| 992 | |
| 993 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 994 | smp_mb__after_atomic_dec(); |
| 995 | kfree(md_buf); |
| 996 | return 0; |
| 997 | } |
| 998 | |
| 999 | /* |
| 1000 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held |
| 1001 | */ |
| 1002 | static int core_alua_update_tpg_secondary_metadata( |
| 1003 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1004 | struct se_port *port, |
| 1005 | unsigned char *md_buf, |
| 1006 | u32 md_buf_len) |
| 1007 | { |
| 1008 | struct se_portal_group *se_tpg = port->sep_tpg; |
| 1009 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; |
| 1010 | int len; |
| 1011 | |
| 1012 | memset(path, 0, ALUA_METADATA_PATH_LEN); |
| 1013 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); |
| 1014 | |
| 1015 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1016 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1017 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1018 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1019 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1020 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1021 | |
| 1022 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" |
| 1023 | "alua_tg_pt_status=0x%02x\n", |
| 1024 | atomic_read(&port->sep_tg_pt_secondary_offline), |
| 1025 | port->sep_tg_pt_secondary_stat); |
| 1026 | |
| 1027 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1028 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1029 | port->sep_lun->unpacked_lun); |
| 1030 | |
| 1031 | return core_alua_write_tpg_metadata(path, md_buf, len); |
| 1032 | } |
| 1033 | |
| 1034 | static int core_alua_set_tg_pt_secondary_state( |
| 1035 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1036 | struct se_port *port, |
| 1037 | int explict, |
| 1038 | int offline) |
| 1039 | { |
| 1040 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1041 | unsigned char *md_buf; |
| 1042 | u32 md_buf_len; |
| 1043 | int trans_delay_msecs; |
| 1044 | |
| 1045 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1046 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1047 | if (!tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1048 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1049 | pr_err("Unable to complete secondary state" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1050 | " transition\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1051 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1052 | } |
| 1053 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; |
| 1054 | /* |
| 1055 | * Set the secondary ALUA target port access state to OFFLINE |
| 1056 | * or release the previously secondary state for struct se_port |
| 1057 | */ |
| 1058 | if (offline) |
| 1059 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); |
| 1060 | else |
| 1061 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); |
| 1062 | |
| 1063 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; |
| 1064 | port->sep_tg_pt_secondary_stat = (explict) ? |
| 1065 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| 1066 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| 1067 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1068 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1069 | " to secondary access state: %s\n", (explict) ? "explict" : |
| 1070 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| 1071 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); |
| 1072 | |
| 1073 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1074 | /* |
| 1075 | * Do the optional transition delay after we set the secondary |
| 1076 | * ALUA access state. |
| 1077 | */ |
| 1078 | if (trans_delay_msecs != 0) |
| 1079 | msleep_interruptible(trans_delay_msecs); |
| 1080 | /* |
| 1081 | * See if we need to update the ALUA fabric port metadata for |
| 1082 | * secondary state and status |
| 1083 | */ |
| 1084 | if (port->sep_tg_pt_secondary_write_md) { |
| 1085 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1086 | if (!md_buf) { |
| 1087 | pr_err("Unable to allocate md_buf for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1088 | " secondary ALUA access metadata\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1089 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1090 | } |
| 1091 | mutex_lock(&port->sep_tg_pt_md_mutex); |
| 1092 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, |
| 1093 | md_buf, md_buf_len); |
| 1094 | mutex_unlock(&port->sep_tg_pt_md_mutex); |
| 1095 | |
| 1096 | kfree(md_buf); |
| 1097 | } |
| 1098 | |
| 1099 | return 0; |
| 1100 | } |
| 1101 | |
| 1102 | struct t10_alua_lu_gp * |
| 1103 | core_alua_allocate_lu_gp(const char *name, int def_group) |
| 1104 | { |
| 1105 | struct t10_alua_lu_gp *lu_gp; |
| 1106 | |
| 1107 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1108 | if (!lu_gp) { |
| 1109 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); |
Justin P. Mattock | 6eab04a | 2011-04-08 19:49:08 -0700 | [diff] [blame] | 1110 | return ERR_PTR(-ENOMEM); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1111 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1112 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1113 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
| 1114 | spin_lock_init(&lu_gp->lu_gp_lock); |
| 1115 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); |
| 1116 | |
| 1117 | if (def_group) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1118 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1119 | lu_gp->lu_gp_valid_id = 1; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1120 | alua_lu_gps_count++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1121 | } |
| 1122 | |
| 1123 | return lu_gp; |
| 1124 | } |
| 1125 | |
| 1126 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) |
| 1127 | { |
| 1128 | struct t10_alua_lu_gp *lu_gp_tmp; |
| 1129 | u16 lu_gp_id_tmp; |
| 1130 | /* |
| 1131 | * The lu_gp->lu_gp_id may only be set once.. |
| 1132 | */ |
| 1133 | if (lu_gp->lu_gp_valid_id) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1134 | pr_warn("ALUA LU Group already has a valid ID," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1135 | " ignoring request\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1136 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1137 | } |
| 1138 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1139 | spin_lock(&lu_gps_lock); |
| 1140 | if (alua_lu_gps_count == 0x0000ffff) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1141 | pr_err("Maximum ALUA alua_lu_gps_count:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1142 | " 0x0000ffff reached\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1143 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1144 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1145 | return -ENOSPC; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1146 | } |
| 1147 | again: |
| 1148 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1149 | alua_lu_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1150 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1151 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1152 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1153 | if (!lu_gp_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1154 | goto again; |
| 1155 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1156 | pr_warn("ALUA Logical Unit Group ID: %hu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1157 | " already exists, ignoring request\n", |
| 1158 | lu_gp_id); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1159 | spin_unlock(&lu_gps_lock); |
| 1160 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1161 | } |
| 1162 | } |
| 1163 | |
| 1164 | lu_gp->lu_gp_id = lu_gp_id_tmp; |
| 1165 | lu_gp->lu_gp_valid_id = 1; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1166 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
| 1167 | alua_lu_gps_count++; |
| 1168 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1169 | |
| 1170 | return 0; |
| 1171 | } |
| 1172 | |
| 1173 | static struct t10_alua_lu_gp_member * |
| 1174 | core_alua_allocate_lu_gp_mem(struct se_device *dev) |
| 1175 | { |
| 1176 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1177 | |
| 1178 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1179 | if (!lu_gp_mem) { |
| 1180 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1181 | return ERR_PTR(-ENOMEM); |
| 1182 | } |
| 1183 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); |
| 1184 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); |
| 1185 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); |
| 1186 | |
| 1187 | lu_gp_mem->lu_gp_mem_dev = dev; |
| 1188 | dev->dev_alua_lu_gp_mem = lu_gp_mem; |
| 1189 | |
| 1190 | return lu_gp_mem; |
| 1191 | } |
| 1192 | |
| 1193 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) |
| 1194 | { |
| 1195 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; |
| 1196 | /* |
| 1197 | * Once we have reached this point, config_item_put() has |
| 1198 | * already been called from target_core_alua_drop_lu_gp(). |
| 1199 | * |
| 1200 | * Here, we remove the *lu_gp from the global list so that |
| 1201 | * no associations can be made while we are releasing |
| 1202 | * struct t10_alua_lu_gp. |
| 1203 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1204 | spin_lock(&lu_gps_lock); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1205 | list_del(&lu_gp->lu_gp_node); |
| 1206 | alua_lu_gps_count--; |
| 1207 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1208 | /* |
| 1209 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() |
| 1210 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be |
| 1211 | * released with core_alua_put_lu_gp_from_name() |
| 1212 | */ |
| 1213 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) |
| 1214 | cpu_relax(); |
| 1215 | /* |
| 1216 | * Release reference to struct t10_alua_lu_gp * from all associated |
| 1217 | * struct se_device. |
| 1218 | */ |
| 1219 | spin_lock(&lu_gp->lu_gp_lock); |
| 1220 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, |
| 1221 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { |
| 1222 | if (lu_gp_mem->lu_gp_assoc) { |
| 1223 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1224 | lu_gp->lu_gp_members--; |
| 1225 | lu_gp_mem->lu_gp_assoc = 0; |
| 1226 | } |
| 1227 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1228 | /* |
| 1229 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1230 | * lu_gp_mem is associated with a single |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1231 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
| 1232 | * struct se_device is released via core_alua_free_lu_gp_mem(). |
| 1233 | * |
| 1234 | * If the passed lu_gp does NOT match the default_lu_gp, assume |
| 1235 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. |
| 1236 | */ |
| 1237 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1238 | if (lu_gp != default_lu_gp) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1239 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1240 | default_lu_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1241 | else |
| 1242 | lu_gp_mem->lu_gp = NULL; |
| 1243 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1244 | |
| 1245 | spin_lock(&lu_gp->lu_gp_lock); |
| 1246 | } |
| 1247 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1248 | |
| 1249 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
| 1250 | } |
| 1251 | |
| 1252 | void core_alua_free_lu_gp_mem(struct se_device *dev) |
| 1253 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1254 | struct t10_alua_lu_gp *lu_gp; |
| 1255 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1256 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1257 | lu_gp_mem = dev->dev_alua_lu_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1258 | if (!lu_gp_mem) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1259 | return; |
| 1260 | |
| 1261 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) |
| 1262 | cpu_relax(); |
| 1263 | |
| 1264 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 1265 | lu_gp = lu_gp_mem->lu_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1266 | if (lu_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1267 | spin_lock(&lu_gp->lu_gp_lock); |
| 1268 | if (lu_gp_mem->lu_gp_assoc) { |
| 1269 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1270 | lu_gp->lu_gp_members--; |
| 1271 | lu_gp_mem->lu_gp_assoc = 0; |
| 1272 | } |
| 1273 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1274 | lu_gp_mem->lu_gp = NULL; |
| 1275 | } |
| 1276 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1277 | |
| 1278 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); |
| 1279 | } |
| 1280 | |
| 1281 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) |
| 1282 | { |
| 1283 | struct t10_alua_lu_gp *lu_gp; |
| 1284 | struct config_item *ci; |
| 1285 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1286 | spin_lock(&lu_gps_lock); |
| 1287 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1288 | if (!lu_gp->lu_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1289 | continue; |
| 1290 | ci = &lu_gp->lu_gp_group.cg_item; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1291 | if (!strcmp(config_item_name(ci), name)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1292 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1293 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1294 | return lu_gp; |
| 1295 | } |
| 1296 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1297 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1298 | |
| 1299 | return NULL; |
| 1300 | } |
| 1301 | |
| 1302 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) |
| 1303 | { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1304 | spin_lock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1305 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1306 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1307 | } |
| 1308 | |
| 1309 | /* |
| 1310 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| 1311 | */ |
| 1312 | void __core_alua_attach_lu_gp_mem( |
| 1313 | struct t10_alua_lu_gp_member *lu_gp_mem, |
| 1314 | struct t10_alua_lu_gp *lu_gp) |
| 1315 | { |
| 1316 | spin_lock(&lu_gp->lu_gp_lock); |
| 1317 | lu_gp_mem->lu_gp = lu_gp; |
| 1318 | lu_gp_mem->lu_gp_assoc = 1; |
| 1319 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); |
| 1320 | lu_gp->lu_gp_members++; |
| 1321 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1322 | } |
| 1323 | |
| 1324 | /* |
| 1325 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| 1326 | */ |
| 1327 | void __core_alua_drop_lu_gp_mem( |
| 1328 | struct t10_alua_lu_gp_member *lu_gp_mem, |
| 1329 | struct t10_alua_lu_gp *lu_gp) |
| 1330 | { |
| 1331 | spin_lock(&lu_gp->lu_gp_lock); |
| 1332 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1333 | lu_gp_mem->lu_gp = NULL; |
| 1334 | lu_gp_mem->lu_gp_assoc = 0; |
| 1335 | lu_gp->lu_gp_members--; |
| 1336 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1337 | } |
| 1338 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1339 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, |
| 1340 | const char *name, int def_group) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1341 | { |
| 1342 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1343 | |
| 1344 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1345 | if (!tg_pt_gp) { |
| 1346 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1347 | return NULL; |
| 1348 | } |
| 1349 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); |
| 1350 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); |
| 1351 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 1352 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); |
| 1353 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1354 | tg_pt_gp->tg_pt_gp_dev = dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1355 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
| 1356 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| 1357 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); |
| 1358 | /* |
| 1359 | * Enable both explict and implict ALUA support by default |
| 1360 | */ |
| 1361 | tg_pt_gp->tg_pt_gp_alua_access_type = |
| 1362 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; |
| 1363 | /* |
| 1364 | * Set the default Active/NonOptimized Delay in milliseconds |
| 1365 | */ |
| 1366 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; |
| 1367 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 1368 | tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1369 | |
| 1370 | if (def_group) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1371 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1372 | tg_pt_gp->tg_pt_gp_id = |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1373 | dev->t10_alua.alua_tg_pt_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1374 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1375 | dev->t10_alua.alua_tg_pt_gps_count++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1376 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1377 | &dev->t10_alua.tg_pt_gps_list); |
| 1378 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1379 | } |
| 1380 | |
| 1381 | return tg_pt_gp; |
| 1382 | } |
| 1383 | |
| 1384 | int core_alua_set_tg_pt_gp_id( |
| 1385 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1386 | u16 tg_pt_gp_id) |
| 1387 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1388 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1389 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
| 1390 | u16 tg_pt_gp_id_tmp; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1391 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1392 | /* |
| 1393 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. |
| 1394 | */ |
| 1395 | if (tg_pt_gp->tg_pt_gp_valid_id) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1396 | pr_warn("ALUA TG PT Group already has a valid ID," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1397 | " ignoring request\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1398 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1399 | } |
| 1400 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1401 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
| 1402 | if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1403 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1404 | " 0x0000ffff reached\n"); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1405 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1406 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1407 | return -ENOSPC; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1408 | } |
| 1409 | again: |
| 1410 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1411 | dev->t10_alua.alua_tg_pt_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1412 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1413 | list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1414 | tg_pt_gp_list) { |
| 1415 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1416 | if (!tg_pt_gp_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1417 | goto again; |
| 1418 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1419 | pr_err("ALUA Target Port Group ID: %hu already" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1420 | " exists, ignoring request\n", tg_pt_gp_id); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1421 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1422 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1423 | } |
| 1424 | } |
| 1425 | |
| 1426 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; |
| 1427 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
| 1428 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1429 | &dev->t10_alua.tg_pt_gps_list); |
| 1430 | dev->t10_alua.alua_tg_pt_gps_count++; |
| 1431 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1432 | |
| 1433 | return 0; |
| 1434 | } |
| 1435 | |
| 1436 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( |
| 1437 | struct se_port *port) |
| 1438 | { |
| 1439 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1440 | |
| 1441 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, |
| 1442 | GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1443 | if (!tg_pt_gp_mem) { |
| 1444 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1445 | return ERR_PTR(-ENOMEM); |
| 1446 | } |
| 1447 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1448 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1449 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); |
| 1450 | |
| 1451 | tg_pt_gp_mem->tg_pt = port; |
| 1452 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1453 | |
| 1454 | return tg_pt_gp_mem; |
| 1455 | } |
| 1456 | |
| 1457 | void core_alua_free_tg_pt_gp( |
| 1458 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1459 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1460 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1461 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1462 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1463 | /* |
| 1464 | * Once we have reached this point, config_item_put() has already |
| 1465 | * been called from target_core_alua_drop_tg_pt_gp(). |
| 1466 | * |
| 1467 | * Here we remove *tg_pt_gp from the global list so that |
| 1468 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS |
| 1469 | * can be made while we are releasing struct t10_alua_tg_pt_gp. |
| 1470 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1471 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1472 | list_del(&tg_pt_gp->tg_pt_gp_list); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1473 | dev->t10_alua.alua_tg_pt_gps_counter--; |
| 1474 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
| 1475 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1476 | /* |
| 1477 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by |
| 1478 | * core_alua_get_tg_pt_gp_by_name() in |
| 1479 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() |
| 1480 | * to be released with core_alua_put_tg_pt_gp_from_name(). |
| 1481 | */ |
| 1482 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) |
| 1483 | cpu_relax(); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1484 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1485 | /* |
| 1486 | * Release reference to struct t10_alua_tg_pt_gp from all associated |
| 1487 | * struct se_port. |
| 1488 | */ |
| 1489 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1490 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, |
| 1491 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { |
| 1492 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| 1493 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1494 | tg_pt_gp->tg_pt_gp_members--; |
| 1495 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1496 | } |
| 1497 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1498 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1499 | * tg_pt_gp_mem is associated with a single |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1500 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
| 1501 | * core_alua_free_tg_pt_gp_mem(). |
| 1502 | * |
| 1503 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, |
| 1504 | * assume we want to re-assocate a given tg_pt_gp_mem with |
| 1505 | * default_tg_pt_gp. |
| 1506 | */ |
| 1507 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1508 | if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1509 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1510 | dev->t10_alua.default_tg_pt_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1511 | } else |
| 1512 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1513 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1514 | |
| 1515 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1516 | } |
| 1517 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1518 | |
| 1519 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
| 1520 | } |
| 1521 | |
| 1522 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) |
| 1523 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1524 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1525 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1526 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1527 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1528 | if (!tg_pt_gp_mem) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1529 | return; |
| 1530 | |
| 1531 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) |
| 1532 | cpu_relax(); |
| 1533 | |
| 1534 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1535 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1536 | if (tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1537 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1538 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| 1539 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1540 | tg_pt_gp->tg_pt_gp_members--; |
| 1541 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1542 | } |
| 1543 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1544 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1545 | } |
| 1546 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1547 | |
| 1548 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); |
| 1549 | } |
| 1550 | |
| 1551 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1552 | struct se_device *dev, const char *name) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1553 | { |
| 1554 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1555 | struct config_item *ci; |
| 1556 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1557 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
| 1558 | list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1559 | tg_pt_gp_list) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1560 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1561 | continue; |
| 1562 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1563 | if (!strcmp(config_item_name(ci), name)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1564 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1565 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1566 | return tg_pt_gp; |
| 1567 | } |
| 1568 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1569 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1570 | |
| 1571 | return NULL; |
| 1572 | } |
| 1573 | |
| 1574 | static void core_alua_put_tg_pt_gp_from_name( |
| 1575 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1576 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1577 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1578 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1579 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1580 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1581 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| 1586 | */ |
| 1587 | void __core_alua_attach_tg_pt_gp_mem( |
| 1588 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1589 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1590 | { |
| 1591 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1592 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; |
| 1593 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; |
| 1594 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, |
| 1595 | &tg_pt_gp->tg_pt_gp_mem_list); |
| 1596 | tg_pt_gp->tg_pt_gp_members++; |
| 1597 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1598 | } |
| 1599 | |
| 1600 | /* |
| 1601 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| 1602 | */ |
| 1603 | static void __core_alua_drop_tg_pt_gp_mem( |
| 1604 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1605 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1606 | { |
| 1607 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1608 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1609 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1610 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1611 | tg_pt_gp->tg_pt_gp_members--; |
| 1612 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1613 | } |
| 1614 | |
| 1615 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) |
| 1616 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1617 | struct config_item *tg_pt_ci; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1618 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1619 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1620 | ssize_t len = 0; |
| 1621 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1622 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1623 | if (!tg_pt_gp_mem) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1624 | return len; |
| 1625 | |
| 1626 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1627 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1628 | if (tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1629 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
| 1630 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" |
| 1631 | " %hu\nTG Port Primary Access State: %s\nTG Port " |
| 1632 | "Primary Access Status: %s\nTG Port Secondary Access" |
| 1633 | " State: %s\nTG Port Secondary Access Status: %s\n", |
| 1634 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, |
| 1635 | core_alua_dump_state(atomic_read( |
| 1636 | &tg_pt_gp->tg_pt_gp_alua_access_state)), |
| 1637 | core_alua_dump_status( |
| 1638 | tg_pt_gp->tg_pt_gp_alua_access_status), |
| 1639 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? |
| 1640 | "Offline" : "None", |
| 1641 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); |
| 1642 | } |
| 1643 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1644 | |
| 1645 | return len; |
| 1646 | } |
| 1647 | |
| 1648 | ssize_t core_alua_store_tg_pt_gp_info( |
| 1649 | struct se_port *port, |
| 1650 | const char *page, |
| 1651 | size_t count) |
| 1652 | { |
| 1653 | struct se_portal_group *tpg; |
| 1654 | struct se_lun *lun; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1655 | struct se_device *dev = port->sep_lun->lun_se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1656 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
| 1657 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1658 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; |
| 1659 | int move = 0; |
| 1660 | |
| 1661 | tpg = port->sep_tpg; |
| 1662 | lun = port->sep_lun; |
| 1663 | |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 1664 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 1665 | if (!tg_pt_gp_mem) |
| 1666 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1667 | |
| 1668 | if (count > TG_PT_GROUP_NAME_BUF) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1669 | pr_err("ALUA Target Port Group alias too large!\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1670 | return -EINVAL; |
| 1671 | } |
| 1672 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); |
| 1673 | memcpy(buf, page, count); |
| 1674 | /* |
| 1675 | * Any ALUA target port group alias besides "NULL" means we will be |
| 1676 | * making a new group association. |
| 1677 | */ |
| 1678 | if (strcmp(strstrip(buf), "NULL")) { |
| 1679 | /* |
| 1680 | * core_alua_get_tg_pt_gp_by_name() will increment reference to |
| 1681 | * struct t10_alua_tg_pt_gp. This reference is released with |
| 1682 | * core_alua_put_tg_pt_gp_from_name() below. |
| 1683 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1684 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1685 | strstrip(buf)); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1686 | if (!tg_pt_gp_new) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1687 | return -ENODEV; |
| 1688 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1689 | |
| 1690 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1691 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1692 | if (tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1693 | /* |
| 1694 | * Clearing an existing tg_pt_gp association, and replacing |
| 1695 | * with the default_tg_pt_gp. |
| 1696 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1697 | if (!tg_pt_gp_new) { |
| 1698 | pr_debug("Target_Core_ConfigFS: Moving" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1699 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
| 1700 | " alua/%s, ID: %hu back to" |
| 1701 | " default_tg_pt_gp\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1702 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
| 1703 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1704 | config_item_name(&lun->lun_group.cg_item), |
| 1705 | config_item_name( |
| 1706 | &tg_pt_gp->tg_pt_gp_group.cg_item), |
| 1707 | tg_pt_gp->tg_pt_gp_id); |
| 1708 | |
| 1709 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); |
| 1710 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1711 | dev->t10_alua.default_tg_pt_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1712 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1713 | |
| 1714 | return count; |
| 1715 | } |
| 1716 | /* |
| 1717 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp |
| 1718 | */ |
| 1719 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); |
| 1720 | move = 1; |
| 1721 | } |
| 1722 | /* |
| 1723 | * Associate tg_pt_gp_mem with tg_pt_gp_new. |
| 1724 | */ |
| 1725 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); |
| 1726 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1727 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1728 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1729 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
| 1730 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1731 | config_item_name(&lun->lun_group.cg_item), |
| 1732 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), |
| 1733 | tg_pt_gp_new->tg_pt_gp_id); |
| 1734 | |
| 1735 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
| 1736 | return count; |
| 1737 | } |
| 1738 | |
| 1739 | ssize_t core_alua_show_access_type( |
| 1740 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1741 | char *page) |
| 1742 | { |
| 1743 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && |
| 1744 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) |
| 1745 | return sprintf(page, "Implict and Explict\n"); |
| 1746 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) |
| 1747 | return sprintf(page, "Implict\n"); |
| 1748 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) |
| 1749 | return sprintf(page, "Explict\n"); |
| 1750 | else |
| 1751 | return sprintf(page, "None\n"); |
| 1752 | } |
| 1753 | |
| 1754 | ssize_t core_alua_store_access_type( |
| 1755 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1756 | const char *page, |
| 1757 | size_t count) |
| 1758 | { |
| 1759 | unsigned long tmp; |
| 1760 | int ret; |
| 1761 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1762 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1763 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1764 | pr_err("Unable to extract alua_access_type\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1765 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1766 | } |
| 1767 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1768 | pr_err("Illegal value for alua_access_type:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1769 | " %lu\n", tmp); |
| 1770 | return -EINVAL; |
| 1771 | } |
| 1772 | if (tmp == 3) |
| 1773 | tg_pt_gp->tg_pt_gp_alua_access_type = |
| 1774 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; |
| 1775 | else if (tmp == 2) |
| 1776 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; |
| 1777 | else if (tmp == 1) |
| 1778 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; |
| 1779 | else |
| 1780 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; |
| 1781 | |
| 1782 | return count; |
| 1783 | } |
| 1784 | |
| 1785 | ssize_t core_alua_show_nonop_delay_msecs( |
| 1786 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1787 | char *page) |
| 1788 | { |
| 1789 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); |
| 1790 | } |
| 1791 | |
| 1792 | ssize_t core_alua_store_nonop_delay_msecs( |
| 1793 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1794 | const char *page, |
| 1795 | size_t count) |
| 1796 | { |
| 1797 | unsigned long tmp; |
| 1798 | int ret; |
| 1799 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1800 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1801 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1802 | pr_err("Unable to extract nonop_delay_msecs\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1803 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1804 | } |
| 1805 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1806 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1807 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
| 1808 | ALUA_MAX_NONOP_DELAY_MSECS); |
| 1809 | return -EINVAL; |
| 1810 | } |
| 1811 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; |
| 1812 | |
| 1813 | return count; |
| 1814 | } |
| 1815 | |
| 1816 | ssize_t core_alua_show_trans_delay_msecs( |
| 1817 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1818 | char *page) |
| 1819 | { |
| 1820 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| 1821 | } |
| 1822 | |
| 1823 | ssize_t core_alua_store_trans_delay_msecs( |
| 1824 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1825 | const char *page, |
| 1826 | size_t count) |
| 1827 | { |
| 1828 | unsigned long tmp; |
| 1829 | int ret; |
| 1830 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1831 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1832 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1833 | pr_err("Unable to extract trans_delay_msecs\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1834 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1835 | } |
| 1836 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1837 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1838 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
| 1839 | ALUA_MAX_TRANS_DELAY_MSECS); |
| 1840 | return -EINVAL; |
| 1841 | } |
| 1842 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; |
| 1843 | |
| 1844 | return count; |
| 1845 | } |
| 1846 | |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 1847 | ssize_t core_alua_show_implict_trans_secs( |
| 1848 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1849 | char *page) |
| 1850 | { |
| 1851 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); |
| 1852 | } |
| 1853 | |
| 1854 | ssize_t core_alua_store_implict_trans_secs( |
| 1855 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1856 | const char *page, |
| 1857 | size_t count) |
| 1858 | { |
| 1859 | unsigned long tmp; |
| 1860 | int ret; |
| 1861 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1862 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 1863 | if (ret < 0) { |
| 1864 | pr_err("Unable to extract implict_trans_secs\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1865 | return ret; |
Nicholas Bellinger | 5b9a4d7 | 2012-05-16 22:02:34 -0700 | [diff] [blame] | 1866 | } |
| 1867 | if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { |
| 1868 | pr_err("Passed implict_trans_secs: %lu, exceeds" |
| 1869 | " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, |
| 1870 | ALUA_MAX_IMPLICT_TRANS_SECS); |
| 1871 | return -EINVAL; |
| 1872 | } |
| 1873 | tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; |
| 1874 | |
| 1875 | return count; |
| 1876 | } |
| 1877 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1878 | ssize_t core_alua_show_preferred_bit( |
| 1879 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1880 | char *page) |
| 1881 | { |
| 1882 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); |
| 1883 | } |
| 1884 | |
| 1885 | ssize_t core_alua_store_preferred_bit( |
| 1886 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1887 | const char *page, |
| 1888 | size_t count) |
| 1889 | { |
| 1890 | unsigned long tmp; |
| 1891 | int ret; |
| 1892 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1893 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1894 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1895 | pr_err("Unable to extract preferred ALUA value\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1896 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1897 | } |
| 1898 | if ((tmp != 0) && (tmp != 1)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1899 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1900 | return -EINVAL; |
| 1901 | } |
| 1902 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; |
| 1903 | |
| 1904 | return count; |
| 1905 | } |
| 1906 | |
| 1907 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) |
| 1908 | { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1909 | if (!lun->lun_sep) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1910 | return -ENODEV; |
| 1911 | |
| 1912 | return sprintf(page, "%d\n", |
| 1913 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); |
| 1914 | } |
| 1915 | |
| 1916 | ssize_t core_alua_store_offline_bit( |
| 1917 | struct se_lun *lun, |
| 1918 | const char *page, |
| 1919 | size_t count) |
| 1920 | { |
| 1921 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1922 | unsigned long tmp; |
| 1923 | int ret; |
| 1924 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1925 | if (!lun->lun_sep) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1926 | return -ENODEV; |
| 1927 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1928 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1929 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1930 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1931 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1932 | } |
| 1933 | if ((tmp != 0) && (tmp != 1)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1934 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1935 | tmp); |
| 1936 | return -EINVAL; |
| 1937 | } |
| 1938 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1939 | if (!tg_pt_gp_mem) { |
| 1940 | pr_err("Unable to locate *tg_pt_gp_mem\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1941 | return -EINVAL; |
| 1942 | } |
| 1943 | |
| 1944 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, |
| 1945 | lun->lun_sep, 0, (int)tmp); |
| 1946 | if (ret < 0) |
| 1947 | return -EINVAL; |
| 1948 | |
| 1949 | return count; |
| 1950 | } |
| 1951 | |
| 1952 | ssize_t core_alua_show_secondary_status( |
| 1953 | struct se_lun *lun, |
| 1954 | char *page) |
| 1955 | { |
| 1956 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); |
| 1957 | } |
| 1958 | |
| 1959 | ssize_t core_alua_store_secondary_status( |
| 1960 | struct se_lun *lun, |
| 1961 | const char *page, |
| 1962 | size_t count) |
| 1963 | { |
| 1964 | unsigned long tmp; |
| 1965 | int ret; |
| 1966 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1967 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1968 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1969 | pr_err("Unable to extract alua_tg_pt_status\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 1970 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1971 | } |
| 1972 | if ((tmp != ALUA_STATUS_NONE) && |
| 1973 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && |
| 1974 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1975 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1976 | tmp); |
| 1977 | return -EINVAL; |
| 1978 | } |
| 1979 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; |
| 1980 | |
| 1981 | return count; |
| 1982 | } |
| 1983 | |
| 1984 | ssize_t core_alua_show_secondary_write_metadata( |
| 1985 | struct se_lun *lun, |
| 1986 | char *page) |
| 1987 | { |
| 1988 | return sprintf(page, "%d\n", |
| 1989 | lun->lun_sep->sep_tg_pt_secondary_write_md); |
| 1990 | } |
| 1991 | |
| 1992 | ssize_t core_alua_store_secondary_write_metadata( |
| 1993 | struct se_lun *lun, |
| 1994 | const char *page, |
| 1995 | size_t count) |
| 1996 | { |
| 1997 | unsigned long tmp; |
| 1998 | int ret; |
| 1999 | |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 2000 | ret = kstrtoul(page, 0, &tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2001 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2002 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 2003 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2004 | } |
| 2005 | if ((tmp != 0) && (tmp != 1)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2006 | pr_err("Illegal value for alua_tg_pt_write_md:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2007 | " %lu\n", tmp); |
| 2008 | return -EINVAL; |
| 2009 | } |
| 2010 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; |
| 2011 | |
| 2012 | return count; |
| 2013 | } |
| 2014 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 2015 | int core_setup_alua(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2016 | { |
Christoph Hellwig | c87fbd5 | 2012-10-10 17:37:16 -0400 | [diff] [blame] | 2017 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && |
| 2018 | !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { |
| 2019 | struct t10_alua_lu_gp_member *lu_gp_mem; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 2020 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2021 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2022 | * Associate this struct se_device with the default ALUA |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2023 | * LUN Group. |
| 2024 | */ |
| 2025 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2026 | if (IS_ERR(lu_gp_mem)) |
| 2027 | return PTR_ERR(lu_gp_mem); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2028 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2029 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 2030 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2031 | default_lu_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2032 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 2033 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2034 | pr_debug("%s: Adding to default ALUA LU Group:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2035 | " core/alua/lu_gps/default_lu_gp\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2036 | dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2037 | } |
| 2038 | |
| 2039 | return 0; |
| 2040 | } |