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 | * |
| 6 | * Copyright (c) 2009-2010 Rising Tide Systems |
| 7 | * Copyright (c) 2009-2010 Linux-iSCSI.org |
| 8 | * |
| 9 | * Nicholas A. Bellinger <nab@kernel.org> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 24 | * |
| 25 | ******************************************************************************/ |
| 26 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 27 | #include <linux/slab.h> |
| 28 | #include <linux/spinlock.h> |
| 29 | #include <linux/configfs.h> |
Paul Gortmaker | c53181a | 2011-08-30 18:16:43 -0400 | [diff] [blame] | 30 | #include <linux/export.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 | |
| 44 | static int core_alua_check_transition(int state, int *primary); |
| 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 | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame^] | 62 | int target_emulate_report_target_port_groups(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 63 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 64 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | struct se_port *port; |
| 66 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 67 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 68 | unsigned char *buf; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 69 | u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
| 70 | Target port group descriptor */ |
Nicholas Bellinger | 6b20fa9 | 2011-10-18 23:48:04 -0700 | [diff] [blame] | 71 | /* |
| 72 | * Need at least 4 bytes of response data or else we can't |
| 73 | * even fit the return data length. |
| 74 | */ |
| 75 | if (cmd->data_length < 4) { |
| 76 | pr_warn("REPORT TARGET PORT GROUPS allocation length %u" |
| 77 | " too small\n", cmd->data_length); |
| 78 | return -EINVAL; |
| 79 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 80 | |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 81 | buf = transport_kmap_data_sg(cmd); |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 82 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 83 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
| 84 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 85 | tg_pt_gp_list) { |
| 86 | /* |
Nicholas Bellinger | 6b20fa9 | 2011-10-18 23:48:04 -0700 | [diff] [blame] | 87 | * Check if the Target port group and Target port descriptor list |
| 88 | * based on tg_pt_gp_members count will fit into the response payload. |
| 89 | * Otherwise, bump rd_len to let the initiator know we have exceeded |
| 90 | * the allocation length and the response is truncated. |
| 91 | */ |
| 92 | if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > |
| 93 | cmd->data_length) { |
| 94 | rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); |
| 95 | continue; |
| 96 | } |
| 97 | /* |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 98 | * PREF: Preferred target port bit, determine if this |
| 99 | * bit should be set for port group. |
| 100 | */ |
| 101 | if (tg_pt_gp->tg_pt_gp_pref) |
| 102 | buf[off] = 0x80; |
| 103 | /* |
| 104 | * Set the ASYMMETRIC ACCESS State |
| 105 | */ |
| 106 | buf[off++] |= (atomic_read( |
| 107 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); |
| 108 | /* |
| 109 | * Set supported ASYMMETRIC ACCESS State bits |
| 110 | */ |
| 111 | buf[off] = 0x80; /* T_SUP */ |
| 112 | buf[off] |= 0x40; /* O_SUP */ |
| 113 | buf[off] |= 0x8; /* U_SUP */ |
| 114 | buf[off] |= 0x4; /* S_SUP */ |
| 115 | buf[off] |= 0x2; /* AN_SUP */ |
| 116 | buf[off++] |= 0x1; /* AO_SUP */ |
| 117 | /* |
| 118 | * TARGET PORT GROUP |
| 119 | */ |
| 120 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); |
| 121 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); |
| 122 | |
| 123 | off++; /* Skip over Reserved */ |
| 124 | /* |
| 125 | * STATUS CODE |
| 126 | */ |
| 127 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); |
| 128 | /* |
| 129 | * Vendor Specific field |
| 130 | */ |
| 131 | buf[off++] = 0x00; |
| 132 | /* |
| 133 | * TARGET PORT COUNT |
| 134 | */ |
| 135 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); |
| 136 | rd_len += 8; |
| 137 | |
| 138 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 139 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| 140 | tg_pt_gp_mem_list) { |
| 141 | port = tg_pt_gp_mem->tg_pt; |
| 142 | /* |
| 143 | * Start Target Port descriptor format |
| 144 | * |
| 145 | * See spc4r17 section 6.2.7 Table 247 |
| 146 | */ |
| 147 | off += 2; /* Skip over Obsolete */ |
| 148 | /* |
| 149 | * Set RELATIVE TARGET PORT IDENTIFIER |
| 150 | */ |
| 151 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); |
| 152 | buf[off++] = (port->sep_rtpi & 0xff); |
| 153 | rd_len += 4; |
| 154 | } |
| 155 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 156 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 157 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 158 | /* |
| 159 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload |
| 160 | */ |
| 161 | buf[0] = ((rd_len >> 24) & 0xff); |
| 162 | buf[1] = ((rd_len >> 16) & 0xff); |
| 163 | buf[2] = ((rd_len >> 8) & 0xff); |
| 164 | buf[3] = (rd_len & 0xff); |
| 165 | |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 166 | transport_kunmap_data_sg(cmd); |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 167 | |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame^] | 168 | target_complete_cmd(cmd, GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. |
| 174 | * |
| 175 | * See spc4r17 section 6.35 |
| 176 | */ |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame^] | 177 | int target_emulate_set_target_port_groups(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 178 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 179 | struct se_device *dev = cmd->se_dev; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 180 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| 181 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; |
| 182 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 183 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
| 184 | 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] | 185 | unsigned char *buf; |
| 186 | unsigned char *ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 187 | u32 len = 4; /* Skip over RESERVED area in header */ |
| 188 | int alua_access_state, primary = 0, rc; |
| 189 | u16 tg_pt_id, rtpi; |
| 190 | |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 191 | if (!l_port) { |
| 192 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 193 | return -EINVAL; |
| 194 | } |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 195 | buf = transport_kmap_data_sg(cmd); |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 196 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 197 | /* |
| 198 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed |
| 199 | * for the local tg_pt_gp. |
| 200 | */ |
| 201 | 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] | 202 | if (!l_tg_pt_gp_mem) { |
| 203 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 204 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 205 | rc = -EINVAL; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 206 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 207 | } |
| 208 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 209 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 210 | if (!l_tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 211 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 212 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 213 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 214 | rc = -EINVAL; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 215 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 216 | } |
| 217 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); |
| 218 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 219 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 220 | if (!rc) { |
| 221 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 222 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 223 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 224 | rc = -EINVAL; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 225 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 226 | } |
| 227 | |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 228 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
| 229 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 230 | while (len < cmd->data_length) { |
| 231 | alua_access_state = (ptr[0] & 0x0f); |
| 232 | /* |
| 233 | * Check the received ALUA access state, and determine if |
| 234 | * the state is a primary or secondary target port asymmetric |
| 235 | * access state. |
| 236 | */ |
| 237 | rc = core_alua_check_transition(alua_access_state, &primary); |
| 238 | if (rc != 0) { |
| 239 | /* |
| 240 | * If the SET TARGET PORT GROUPS attempts to establish |
| 241 | * an invalid combination of target port asymmetric |
| 242 | * access states or attempts to establish an |
| 243 | * unsupported target port asymmetric access state, |
| 244 | * then the command shall be terminated with CHECK |
| 245 | * CONDITION status, with the sense key set to ILLEGAL |
| 246 | * REQUEST, and the additional sense code set to INVALID |
| 247 | * FIELD IN PARAMETER LIST. |
| 248 | */ |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 249 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
| 250 | rc = -EINVAL; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 251 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 252 | } |
| 253 | rc = -1; |
| 254 | /* |
| 255 | * If the ASYMMETRIC ACCESS STATE field (see table 267) |
| 256 | * specifies a primary target port asymmetric access state, |
| 257 | * then the TARGET PORT GROUP OR TARGET PORT field specifies |
| 258 | * a primary target port group for which the primary target |
| 259 | * port asymmetric access state shall be changed. If the |
| 260 | * ASYMMETRIC ACCESS STATE field specifies a secondary target |
| 261 | * port asymmetric access state, then the TARGET PORT GROUP OR |
| 262 | * TARGET PORT field specifies the relative target port |
| 263 | * identifier (see 3.1.120) of the target port for which the |
| 264 | * secondary target port asymmetric access state shall be |
| 265 | * changed. |
| 266 | */ |
| 267 | if (primary) { |
Roland Dreier | 33395fb | 2012-02-23 17:22:12 -0800 | [diff] [blame] | 268 | tg_pt_id = get_unaligned_be16(ptr + 2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 269 | /* |
| 270 | * Locate the matching target port group ID from |
| 271 | * the global tg_pt_gp list |
| 272 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 273 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 274 | list_for_each_entry(tg_pt_gp, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 275 | &su_dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 276 | tg_pt_gp_list) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 277 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 278 | continue; |
| 279 | |
| 280 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) |
| 281 | continue; |
| 282 | |
| 283 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 284 | smp_mb__after_atomic_inc(); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 285 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 286 | |
| 287 | rc = core_alua_do_port_transition(tg_pt_gp, |
| 288 | dev, l_port, nacl, |
| 289 | alua_access_state, 1); |
| 290 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 291 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 292 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 293 | smp_mb__after_atomic_dec(); |
| 294 | break; |
| 295 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 296 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 297 | /* |
| 298 | * If not matching target port group ID can be located |
| 299 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST |
| 300 | */ |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 301 | if (rc != 0) { |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 302 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
| 303 | rc = -EINVAL; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 304 | goto out; |
| 305 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 306 | } else { |
| 307 | /* |
| 308 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify |
| 309 | * the Target Port in question for the the incoming |
| 310 | * SET_TARGET_PORT_GROUPS op. |
| 311 | */ |
Roland Dreier | 33395fb | 2012-02-23 17:22:12 -0800 | [diff] [blame] | 312 | rtpi = get_unaligned_be16(ptr + 2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 313 | /* |
| 314 | * Locate the matching relative target port identifer |
| 315 | * for the struct se_device storage object. |
| 316 | */ |
| 317 | spin_lock(&dev->se_port_lock); |
| 318 | list_for_each_entry(port, &dev->dev_sep_list, |
| 319 | sep_list) { |
| 320 | if (port->sep_rtpi != rtpi) |
| 321 | continue; |
| 322 | |
| 323 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 324 | spin_unlock(&dev->se_port_lock); |
| 325 | |
| 326 | rc = core_alua_set_tg_pt_secondary_state( |
| 327 | tg_pt_gp_mem, port, 1, 1); |
| 328 | |
| 329 | spin_lock(&dev->se_port_lock); |
| 330 | break; |
| 331 | } |
| 332 | spin_unlock(&dev->se_port_lock); |
| 333 | /* |
| 334 | * If not matching relative target port identifier can |
| 335 | * be located, throw an exception with ASCQ: |
| 336 | * INVALID_PARAMETER_LIST |
| 337 | */ |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 338 | if (rc != 0) { |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 339 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
| 340 | rc = -EINVAL; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 341 | goto out; |
| 342 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | ptr += 4; |
| 346 | len += 4; |
| 347 | } |
| 348 | |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 349 | out: |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 350 | transport_kunmap_data_sg(cmd); |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame^] | 351 | target_complete_cmd(cmd, GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | static inline int core_alua_state_nonoptimized( |
| 356 | struct se_cmd *cmd, |
| 357 | unsigned char *cdb, |
| 358 | int nonop_delay_msecs, |
| 359 | u8 *alua_ascq) |
| 360 | { |
| 361 | /* |
| 362 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked |
| 363 | * later to determine if processing of this cmd needs to be |
| 364 | * temporarily delayed for the Active/NonOptimized primary access state. |
| 365 | */ |
| 366 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; |
| 367 | cmd->alua_nonop_delay = nonop_delay_msecs; |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static inline int core_alua_state_standby( |
| 372 | struct se_cmd *cmd, |
| 373 | unsigned char *cdb, |
| 374 | u8 *alua_ascq) |
| 375 | { |
| 376 | /* |
| 377 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by |
| 378 | * spc4r17 section 5.9.2.4.4 |
| 379 | */ |
| 380 | switch (cdb[0]) { |
| 381 | case INQUIRY: |
| 382 | case LOG_SELECT: |
| 383 | case LOG_SENSE: |
| 384 | case MODE_SELECT: |
| 385 | case MODE_SENSE: |
| 386 | case REPORT_LUNS: |
| 387 | case RECEIVE_DIAGNOSTIC: |
| 388 | case SEND_DIAGNOSTIC: |
| 389 | case MAINTENANCE_IN: |
| 390 | switch (cdb[1]) { |
| 391 | case MI_REPORT_TARGET_PGS: |
| 392 | return 0; |
| 393 | default: |
| 394 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 395 | return 1; |
| 396 | } |
| 397 | case MAINTENANCE_OUT: |
| 398 | switch (cdb[1]) { |
| 399 | case MO_SET_TARGET_PGS: |
| 400 | return 0; |
| 401 | default: |
| 402 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 403 | return 1; |
| 404 | } |
| 405 | case REQUEST_SENSE: |
| 406 | case PERSISTENT_RESERVE_IN: |
| 407 | case PERSISTENT_RESERVE_OUT: |
| 408 | case READ_BUFFER: |
| 409 | case WRITE_BUFFER: |
| 410 | return 0; |
| 411 | default: |
| 412 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 413 | return 1; |
| 414 | } |
| 415 | |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | static inline int core_alua_state_unavailable( |
| 420 | struct se_cmd *cmd, |
| 421 | unsigned char *cdb, |
| 422 | u8 *alua_ascq) |
| 423 | { |
| 424 | /* |
| 425 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by |
| 426 | * spc4r17 section 5.9.2.4.5 |
| 427 | */ |
| 428 | switch (cdb[0]) { |
| 429 | case INQUIRY: |
| 430 | case REPORT_LUNS: |
| 431 | case MAINTENANCE_IN: |
| 432 | switch (cdb[1]) { |
| 433 | case MI_REPORT_TARGET_PGS: |
| 434 | return 0; |
| 435 | default: |
| 436 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 437 | return 1; |
| 438 | } |
| 439 | case MAINTENANCE_OUT: |
| 440 | switch (cdb[1]) { |
| 441 | case MO_SET_TARGET_PGS: |
| 442 | return 0; |
| 443 | default: |
| 444 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 445 | return 1; |
| 446 | } |
| 447 | case REQUEST_SENSE: |
| 448 | case READ_BUFFER: |
| 449 | case WRITE_BUFFER: |
| 450 | return 0; |
| 451 | default: |
| 452 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 453 | return 1; |
| 454 | } |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static inline int core_alua_state_transition( |
| 460 | struct se_cmd *cmd, |
| 461 | unsigned char *cdb, |
| 462 | u8 *alua_ascq) |
| 463 | { |
| 464 | /* |
| 465 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by |
| 466 | * spc4r17 section 5.9.2.5 |
| 467 | */ |
| 468 | switch (cdb[0]) { |
| 469 | case INQUIRY: |
| 470 | case REPORT_LUNS: |
| 471 | case MAINTENANCE_IN: |
| 472 | switch (cdb[1]) { |
| 473 | case MI_REPORT_TARGET_PGS: |
| 474 | return 0; |
| 475 | default: |
| 476 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| 477 | return 1; |
| 478 | } |
| 479 | case REQUEST_SENSE: |
| 480 | case READ_BUFFER: |
| 481 | case WRITE_BUFFER: |
| 482 | return 0; |
| 483 | default: |
| 484 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| 485 | return 1; |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED |
| 493 | * in transport_cmd_sequencer(). This function is assigned to |
| 494 | * struct t10_alua *->state_check() in core_setup_alua() |
| 495 | */ |
| 496 | static int core_alua_state_check_nop( |
| 497 | struct se_cmd *cmd, |
| 498 | unsigned char *cdb, |
| 499 | u8 *alua_ascq) |
| 500 | { |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). |
| 506 | * This function is assigned to struct t10_alua *->state_check() in |
| 507 | * core_setup_alua() |
| 508 | * |
| 509 | * Also, this function can return three different return codes to |
| 510 | * signal transport_generic_cmd_sequencer() |
| 511 | * |
| 512 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
| 513 | * return 0: Used to signal success |
| 514 | * reutrn -1: Used to signal failure, and invalid cdb field |
| 515 | */ |
| 516 | static int core_alua_state_check( |
| 517 | struct se_cmd *cmd, |
| 518 | unsigned char *cdb, |
| 519 | u8 *alua_ascq) |
| 520 | { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 521 | struct se_lun *lun = cmd->se_lun; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 522 | struct se_port *port = lun->lun_sep; |
| 523 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 524 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 525 | int out_alua_state, nonop_delay_msecs; |
| 526 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 527 | if (!port) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 528 | return 0; |
| 529 | /* |
| 530 | * First, check for a struct se_port specific secondary ALUA target port |
| 531 | * access state: OFFLINE |
| 532 | */ |
| 533 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { |
| 534 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 535 | pr_debug("ALUA: Got secondary offline status for local" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 536 | " target port\n"); |
| 537 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
| 538 | return 1; |
| 539 | } |
| 540 | /* |
| 541 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the |
| 542 | * ALUA target port group, to obtain current ALUA access state. |
| 543 | * Otherwise look for the underlying struct se_device association with |
| 544 | * a ALUA logical unit group. |
| 545 | */ |
| 546 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 547 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 548 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 549 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| 550 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; |
| 551 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 552 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 553 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
| 554 | * statement so the compiler knows explicitly to check this case first. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 555 | * For the Optimized ALUA access state case, we want to process the |
| 556 | * incoming fabric cmd ASAP.. |
| 557 | */ |
| 558 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) |
| 559 | return 0; |
| 560 | |
| 561 | switch (out_alua_state) { |
| 562 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 563 | return core_alua_state_nonoptimized(cmd, cdb, |
| 564 | nonop_delay_msecs, alua_ascq); |
| 565 | case ALUA_ACCESS_STATE_STANDBY: |
| 566 | return core_alua_state_standby(cmd, cdb, alua_ascq); |
| 567 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 568 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); |
| 569 | case ALUA_ACCESS_STATE_TRANSITION: |
| 570 | return core_alua_state_transition(cmd, cdb, alua_ascq); |
| 571 | /* |
| 572 | * OFFLINE is a secondary ALUA target port group access state, that is |
| 573 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 |
| 574 | */ |
| 575 | case ALUA_ACCESS_STATE_OFFLINE: |
| 576 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 577 | pr_err("Unknown ALUA access state: 0x%02x\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 578 | out_alua_state); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 579 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | /* |
| 586 | * Check implict and explict ALUA state change request. |
| 587 | */ |
| 588 | static int core_alua_check_transition(int state, int *primary) |
| 589 | { |
| 590 | switch (state) { |
| 591 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| 592 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 593 | case ALUA_ACCESS_STATE_STANDBY: |
| 594 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 595 | /* |
| 596 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are |
| 597 | * defined as primary target port asymmetric access states. |
| 598 | */ |
| 599 | *primary = 1; |
| 600 | break; |
| 601 | case ALUA_ACCESS_STATE_OFFLINE: |
| 602 | /* |
| 603 | * OFFLINE state is defined as a secondary target port |
| 604 | * asymmetric access state. |
| 605 | */ |
| 606 | *primary = 0; |
| 607 | break; |
| 608 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 609 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 610 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static char *core_alua_dump_state(int state) |
| 617 | { |
| 618 | switch (state) { |
| 619 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| 620 | return "Active/Optimized"; |
| 621 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 622 | return "Active/NonOptimized"; |
| 623 | case ALUA_ACCESS_STATE_STANDBY: |
| 624 | return "Standby"; |
| 625 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 626 | return "Unavailable"; |
| 627 | case ALUA_ACCESS_STATE_OFFLINE: |
| 628 | return "Offline"; |
| 629 | default: |
| 630 | return "Unknown"; |
| 631 | } |
| 632 | |
| 633 | return NULL; |
| 634 | } |
| 635 | |
| 636 | char *core_alua_dump_status(int status) |
| 637 | { |
| 638 | switch (status) { |
| 639 | case ALUA_STATUS_NONE: |
| 640 | return "None"; |
| 641 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: |
| 642 | return "Altered by Explict STPG"; |
| 643 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: |
| 644 | return "Altered by Implict ALUA"; |
| 645 | default: |
| 646 | return "Unknown"; |
| 647 | } |
| 648 | |
| 649 | return NULL; |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * Used by fabric modules to determine when we need to delay processing |
| 654 | * for the Active/NonOptimized paths.. |
| 655 | */ |
| 656 | int core_alua_check_nonop_delay( |
| 657 | struct se_cmd *cmd) |
| 658 | { |
| 659 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) |
| 660 | return 0; |
| 661 | if (in_interrupt()) |
| 662 | return 0; |
| 663 | /* |
| 664 | * The ALUA Active/NonOptimized access state delay can be disabled |
| 665 | * in via configfs with a value of zero |
| 666 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 667 | if (!cmd->alua_nonop_delay) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 668 | return 0; |
| 669 | /* |
| 670 | * struct se_cmd->alua_nonop_delay gets set by a target port group |
| 671 | * defined interval in core_alua_state_nonoptimized() |
| 672 | */ |
| 673 | msleep_interruptible(cmd->alua_nonop_delay); |
| 674 | return 0; |
| 675 | } |
| 676 | EXPORT_SYMBOL(core_alua_check_nonop_delay); |
| 677 | |
| 678 | /* |
| 679 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex |
| 680 | * |
| 681 | */ |
| 682 | static int core_alua_write_tpg_metadata( |
| 683 | const char *path, |
| 684 | unsigned char *md_buf, |
| 685 | u32 md_buf_len) |
| 686 | { |
| 687 | mm_segment_t old_fs; |
| 688 | struct file *file; |
| 689 | struct iovec iov[1]; |
| 690 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; |
| 691 | |
| 692 | memset(iov, 0, sizeof(struct iovec)); |
| 693 | |
| 694 | file = filp_open(path, flags, 0600); |
| 695 | if (IS_ERR(file) || !file || !file->f_dentry) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 696 | pr_err("filp_open(%s) for ALUA metadata failed\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 697 | path); |
| 698 | return -ENODEV; |
| 699 | } |
| 700 | |
| 701 | iov[0].iov_base = &md_buf[0]; |
| 702 | iov[0].iov_len = md_buf_len; |
| 703 | |
| 704 | old_fs = get_fs(); |
| 705 | set_fs(get_ds()); |
| 706 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); |
| 707 | set_fs(old_fs); |
| 708 | |
| 709 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 710 | pr_err("Error writing ALUA metadata file: %s\n", path); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 711 | filp_close(file, NULL); |
| 712 | return -EIO; |
| 713 | } |
| 714 | filp_close(file, NULL); |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held |
| 721 | */ |
| 722 | static int core_alua_update_tpg_primary_metadata( |
| 723 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 724 | int primary_state, |
| 725 | unsigned char *md_buf) |
| 726 | { |
| 727 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 728 | struct t10_wwn *wwn = &su_dev->t10_wwn; |
| 729 | char path[ALUA_METADATA_PATH_LEN]; |
| 730 | int len; |
| 731 | |
| 732 | memset(path, 0, ALUA_METADATA_PATH_LEN); |
| 733 | |
| 734 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, |
| 735 | "tg_pt_gp_id=%hu\n" |
| 736 | "alua_access_state=0x%02x\n" |
| 737 | "alua_access_status=0x%02x\n", |
| 738 | tg_pt_gp->tg_pt_gp_id, primary_state, |
| 739 | tg_pt_gp->tg_pt_gp_alua_access_status); |
| 740 | |
| 741 | snprintf(path, ALUA_METADATA_PATH_LEN, |
| 742 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], |
| 743 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); |
| 744 | |
| 745 | return core_alua_write_tpg_metadata(path, md_buf, len); |
| 746 | } |
| 747 | |
| 748 | static int core_alua_do_transition_tg_pt( |
| 749 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 750 | struct se_port *l_port, |
| 751 | struct se_node_acl *nacl, |
| 752 | unsigned char *md_buf, |
| 753 | int new_state, |
| 754 | int explict) |
| 755 | { |
| 756 | struct se_dev_entry *se_deve; |
| 757 | struct se_lun_acl *lacl; |
| 758 | struct se_port *port; |
| 759 | struct t10_alua_tg_pt_gp_member *mem; |
| 760 | int old_state = 0; |
| 761 | /* |
| 762 | * Save the old primary ALUA access state, and set the current state |
| 763 | * to ALUA_ACCESS_STATE_TRANSITION. |
| 764 | */ |
| 765 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| 766 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| 767 | ALUA_ACCESS_STATE_TRANSITION); |
| 768 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? |
| 769 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| 770 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| 771 | /* |
| 772 | * Check for the optional ALUA primary state transition delay |
| 773 | */ |
| 774 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) |
| 775 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| 776 | |
| 777 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 778 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| 779 | tg_pt_gp_mem_list) { |
| 780 | port = mem->tg_pt; |
| 781 | /* |
| 782 | * After an implicit target port asymmetric access state |
| 783 | * change, a device server shall establish a unit attention |
| 784 | * condition for the initiator port associated with every I_T |
| 785 | * nexus with the additional sense code set to ASYMMETRIC |
| 786 | * ACCESS STATE CHAGED. |
| 787 | * |
| 788 | * After an explicit target port asymmetric access state |
| 789 | * change, a device server shall establish a unit attention |
| 790 | * condition with the additional sense code set to ASYMMETRIC |
| 791 | * ACCESS STATE CHANGED for the initiator port associated with |
| 792 | * every I_T nexus other than the I_T nexus on which the SET |
| 793 | * TARGET PORT GROUPS command |
| 794 | */ |
| 795 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); |
| 796 | smp_mb__after_atomic_inc(); |
| 797 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 798 | |
| 799 | spin_lock_bh(&port->sep_alua_lock); |
| 800 | list_for_each_entry(se_deve, &port->sep_alua_list, |
| 801 | alua_port_list) { |
| 802 | lacl = se_deve->se_lun_acl; |
| 803 | /* |
| 804 | * se_deve->se_lun_acl pointer may be NULL for a |
| 805 | * entry created without explict Node+MappedLUN ACLs |
| 806 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 807 | if (!lacl) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 808 | continue; |
| 809 | |
| 810 | if (explict && |
| 811 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && |
| 812 | (l_port != NULL) && (l_port == port)) |
| 813 | continue; |
| 814 | |
| 815 | core_scsi3_ua_allocate(lacl->se_lun_nacl, |
| 816 | se_deve->mapped_lun, 0x2A, |
| 817 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); |
| 818 | } |
| 819 | spin_unlock_bh(&port->sep_alua_lock); |
| 820 | |
| 821 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 822 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); |
| 823 | smp_mb__after_atomic_dec(); |
| 824 | } |
| 825 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 826 | /* |
| 827 | * Update the ALUA metadata buf that has been allocated in |
| 828 | * core_alua_do_port_transition(), this metadata will be written |
| 829 | * to struct file. |
| 830 | * |
| 831 | * Note that there is the case where we do not want to update the |
| 832 | * metadata when the saved metadata is being parsed in userspace |
| 833 | * when setting the existing port access state and access status. |
| 834 | * |
| 835 | * Also note that the failure to write out the ALUA metadata to |
| 836 | * struct file does NOT affect the actual ALUA transition. |
| 837 | */ |
| 838 | if (tg_pt_gp->tg_pt_gp_write_metadata) { |
| 839 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 840 | core_alua_update_tpg_primary_metadata(tg_pt_gp, |
| 841 | new_state, md_buf); |
| 842 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 843 | } |
| 844 | /* |
| 845 | * Set the current primary ALUA access state to the requested new state |
| 846 | */ |
| 847 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); |
| 848 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 849 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 850 | " from primary access state %s to %s\n", (explict) ? "explict" : |
| 851 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| 852 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), |
| 853 | core_alua_dump_state(new_state)); |
| 854 | |
| 855 | return 0; |
| 856 | } |
| 857 | |
| 858 | int core_alua_do_port_transition( |
| 859 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, |
| 860 | struct se_device *l_dev, |
| 861 | struct se_port *l_port, |
| 862 | struct se_node_acl *l_nacl, |
| 863 | int new_state, |
| 864 | int explict) |
| 865 | { |
| 866 | struct se_device *dev; |
| 867 | struct se_port *port; |
| 868 | struct se_subsystem_dev *su_dev; |
| 869 | struct se_node_acl *nacl; |
| 870 | struct t10_alua_lu_gp *lu_gp; |
| 871 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; |
| 872 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 873 | unsigned char *md_buf; |
| 874 | int primary; |
| 875 | |
| 876 | if (core_alua_check_transition(new_state, &primary) != 0) |
| 877 | return -EINVAL; |
| 878 | |
| 879 | 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] | 880 | if (!md_buf) { |
| 881 | pr_err("Unable to allocate buf for ALUA metadata\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 882 | return -ENOMEM; |
| 883 | } |
| 884 | |
| 885 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; |
| 886 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); |
| 887 | lu_gp = local_lu_gp_mem->lu_gp; |
| 888 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
| 889 | smp_mb__after_atomic_inc(); |
| 890 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); |
| 891 | /* |
| 892 | * For storage objects that are members of the 'default_lu_gp', |
| 893 | * we only do transition on the passed *l_tp_pt_gp, and not |
| 894 | * on all of the matching target port groups IDs in default_lu_gp. |
| 895 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 896 | if (!lu_gp->lu_gp_id) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 897 | /* |
| 898 | * core_alua_do_transition_tg_pt() will always return |
| 899 | * success. |
| 900 | */ |
| 901 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, |
| 902 | md_buf, new_state, explict); |
| 903 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 904 | smp_mb__after_atomic_dec(); |
| 905 | kfree(md_buf); |
| 906 | return 0; |
| 907 | } |
| 908 | /* |
| 909 | * For all other LU groups aside from 'default_lu_gp', walk all of |
| 910 | * the associated storage objects looking for a matching target port |
| 911 | * group ID from the local target port group. |
| 912 | */ |
| 913 | spin_lock(&lu_gp->lu_gp_lock); |
| 914 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, |
| 915 | lu_gp_mem_list) { |
| 916 | |
| 917 | dev = lu_gp_mem->lu_gp_mem_dev; |
| 918 | su_dev = dev->se_sub_dev; |
| 919 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| 920 | smp_mb__after_atomic_inc(); |
| 921 | spin_unlock(&lu_gp->lu_gp_lock); |
| 922 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 923 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 924 | list_for_each_entry(tg_pt_gp, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 925 | &su_dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 926 | tg_pt_gp_list) { |
| 927 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 928 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 929 | continue; |
| 930 | /* |
| 931 | * If the target behavior port asymmetric access state |
| 932 | * is changed for any target port group accessiable via |
| 933 | * a logical unit within a LU group, the target port |
| 934 | * behavior group asymmetric access states for the same |
| 935 | * target port group accessible via other logical units |
| 936 | * in that LU group will also change. |
| 937 | */ |
| 938 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) |
| 939 | continue; |
| 940 | |
| 941 | if (l_tg_pt_gp == tg_pt_gp) { |
| 942 | port = l_port; |
| 943 | nacl = l_nacl; |
| 944 | } else { |
| 945 | port = NULL; |
| 946 | nacl = NULL; |
| 947 | } |
| 948 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 949 | smp_mb__after_atomic_inc(); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 950 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 951 | /* |
| 952 | * core_alua_do_transition_tg_pt() will always return |
| 953 | * success. |
| 954 | */ |
| 955 | core_alua_do_transition_tg_pt(tg_pt_gp, port, |
| 956 | nacl, md_buf, new_state, explict); |
| 957 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 958 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 959 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 960 | smp_mb__after_atomic_dec(); |
| 961 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 962 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 963 | |
| 964 | spin_lock(&lu_gp->lu_gp_lock); |
| 965 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| 966 | smp_mb__after_atomic_dec(); |
| 967 | } |
| 968 | spin_unlock(&lu_gp->lu_gp_lock); |
| 969 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 970 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 971 | " Group IDs: %hu %s transition to primary state: %s\n", |
| 972 | config_item_name(&lu_gp->lu_gp_group.cg_item), |
| 973 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", |
| 974 | core_alua_dump_state(new_state)); |
| 975 | |
| 976 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 977 | smp_mb__after_atomic_dec(); |
| 978 | kfree(md_buf); |
| 979 | return 0; |
| 980 | } |
| 981 | |
| 982 | /* |
| 983 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held |
| 984 | */ |
| 985 | static int core_alua_update_tpg_secondary_metadata( |
| 986 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 987 | struct se_port *port, |
| 988 | unsigned char *md_buf, |
| 989 | u32 md_buf_len) |
| 990 | { |
| 991 | struct se_portal_group *se_tpg = port->sep_tpg; |
| 992 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; |
| 993 | int len; |
| 994 | |
| 995 | memset(path, 0, ALUA_METADATA_PATH_LEN); |
| 996 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); |
| 997 | |
| 998 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 999 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1000 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1001 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1002 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1003 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1004 | |
| 1005 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" |
| 1006 | "alua_tg_pt_status=0x%02x\n", |
| 1007 | atomic_read(&port->sep_tg_pt_secondary_offline), |
| 1008 | port->sep_tg_pt_secondary_stat); |
| 1009 | |
| 1010 | 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] | 1011 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1012 | port->sep_lun->unpacked_lun); |
| 1013 | |
| 1014 | return core_alua_write_tpg_metadata(path, md_buf, len); |
| 1015 | } |
| 1016 | |
| 1017 | static int core_alua_set_tg_pt_secondary_state( |
| 1018 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1019 | struct se_port *port, |
| 1020 | int explict, |
| 1021 | int offline) |
| 1022 | { |
| 1023 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1024 | unsigned char *md_buf; |
| 1025 | u32 md_buf_len; |
| 1026 | int trans_delay_msecs; |
| 1027 | |
| 1028 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1029 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1030 | if (!tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1031 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1032 | pr_err("Unable to complete secondary state" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1033 | " transition\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1034 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1035 | } |
| 1036 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; |
| 1037 | /* |
| 1038 | * Set the secondary ALUA target port access state to OFFLINE |
| 1039 | * or release the previously secondary state for struct se_port |
| 1040 | */ |
| 1041 | if (offline) |
| 1042 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); |
| 1043 | else |
| 1044 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); |
| 1045 | |
| 1046 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; |
| 1047 | port->sep_tg_pt_secondary_stat = (explict) ? |
| 1048 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| 1049 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| 1050 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1051 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1052 | " to secondary access state: %s\n", (explict) ? "explict" : |
| 1053 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| 1054 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); |
| 1055 | |
| 1056 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1057 | /* |
| 1058 | * Do the optional transition delay after we set the secondary |
| 1059 | * ALUA access state. |
| 1060 | */ |
| 1061 | if (trans_delay_msecs != 0) |
| 1062 | msleep_interruptible(trans_delay_msecs); |
| 1063 | /* |
| 1064 | * See if we need to update the ALUA fabric port metadata for |
| 1065 | * secondary state and status |
| 1066 | */ |
| 1067 | if (port->sep_tg_pt_secondary_write_md) { |
| 1068 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1069 | if (!md_buf) { |
| 1070 | pr_err("Unable to allocate md_buf for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1071 | " secondary ALUA access metadata\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1072 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1073 | } |
| 1074 | mutex_lock(&port->sep_tg_pt_md_mutex); |
| 1075 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, |
| 1076 | md_buf, md_buf_len); |
| 1077 | mutex_unlock(&port->sep_tg_pt_md_mutex); |
| 1078 | |
| 1079 | kfree(md_buf); |
| 1080 | } |
| 1081 | |
| 1082 | return 0; |
| 1083 | } |
| 1084 | |
| 1085 | struct t10_alua_lu_gp * |
| 1086 | core_alua_allocate_lu_gp(const char *name, int def_group) |
| 1087 | { |
| 1088 | struct t10_alua_lu_gp *lu_gp; |
| 1089 | |
| 1090 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1091 | if (!lu_gp) { |
| 1092 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); |
Justin P. Mattock | 6eab04a | 2011-04-08 19:49:08 -0700 | [diff] [blame] | 1093 | return ERR_PTR(-ENOMEM); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1094 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1095 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1096 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
| 1097 | spin_lock_init(&lu_gp->lu_gp_lock); |
| 1098 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); |
| 1099 | |
| 1100 | if (def_group) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1101 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1102 | lu_gp->lu_gp_valid_id = 1; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1103 | alua_lu_gps_count++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1104 | } |
| 1105 | |
| 1106 | return lu_gp; |
| 1107 | } |
| 1108 | |
| 1109 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) |
| 1110 | { |
| 1111 | struct t10_alua_lu_gp *lu_gp_tmp; |
| 1112 | u16 lu_gp_id_tmp; |
| 1113 | /* |
| 1114 | * The lu_gp->lu_gp_id may only be set once.. |
| 1115 | */ |
| 1116 | if (lu_gp->lu_gp_valid_id) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1117 | pr_warn("ALUA LU Group already has a valid ID," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1118 | " ignoring request\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1119 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1120 | } |
| 1121 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1122 | spin_lock(&lu_gps_lock); |
| 1123 | if (alua_lu_gps_count == 0x0000ffff) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1124 | pr_err("Maximum ALUA alua_lu_gps_count:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1125 | " 0x0000ffff reached\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1126 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1127 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1128 | return -ENOSPC; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1129 | } |
| 1130 | again: |
| 1131 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1132 | alua_lu_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1133 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1134 | 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] | 1135 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1136 | if (!lu_gp_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1137 | goto again; |
| 1138 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1139 | pr_warn("ALUA Logical Unit Group ID: %hu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1140 | " already exists, ignoring request\n", |
| 1141 | lu_gp_id); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1142 | spin_unlock(&lu_gps_lock); |
| 1143 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | lu_gp->lu_gp_id = lu_gp_id_tmp; |
| 1148 | lu_gp->lu_gp_valid_id = 1; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1149 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
| 1150 | alua_lu_gps_count++; |
| 1151 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1152 | |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
| 1156 | static struct t10_alua_lu_gp_member * |
| 1157 | core_alua_allocate_lu_gp_mem(struct se_device *dev) |
| 1158 | { |
| 1159 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1160 | |
| 1161 | 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] | 1162 | if (!lu_gp_mem) { |
| 1163 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1164 | return ERR_PTR(-ENOMEM); |
| 1165 | } |
| 1166 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); |
| 1167 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); |
| 1168 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); |
| 1169 | |
| 1170 | lu_gp_mem->lu_gp_mem_dev = dev; |
| 1171 | dev->dev_alua_lu_gp_mem = lu_gp_mem; |
| 1172 | |
| 1173 | return lu_gp_mem; |
| 1174 | } |
| 1175 | |
| 1176 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) |
| 1177 | { |
| 1178 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; |
| 1179 | /* |
| 1180 | * Once we have reached this point, config_item_put() has |
| 1181 | * already been called from target_core_alua_drop_lu_gp(). |
| 1182 | * |
| 1183 | * Here, we remove the *lu_gp from the global list so that |
| 1184 | * no associations can be made while we are releasing |
| 1185 | * struct t10_alua_lu_gp. |
| 1186 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1187 | spin_lock(&lu_gps_lock); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1188 | list_del(&lu_gp->lu_gp_node); |
| 1189 | alua_lu_gps_count--; |
| 1190 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1191 | /* |
| 1192 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() |
| 1193 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be |
| 1194 | * released with core_alua_put_lu_gp_from_name() |
| 1195 | */ |
| 1196 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) |
| 1197 | cpu_relax(); |
| 1198 | /* |
| 1199 | * Release reference to struct t10_alua_lu_gp * from all associated |
| 1200 | * struct se_device. |
| 1201 | */ |
| 1202 | spin_lock(&lu_gp->lu_gp_lock); |
| 1203 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, |
| 1204 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { |
| 1205 | if (lu_gp_mem->lu_gp_assoc) { |
| 1206 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1207 | lu_gp->lu_gp_members--; |
| 1208 | lu_gp_mem->lu_gp_assoc = 0; |
| 1209 | } |
| 1210 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1211 | /* |
| 1212 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1213 | * lu_gp_mem is associated with a single |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1214 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
| 1215 | * struct se_device is released via core_alua_free_lu_gp_mem(). |
| 1216 | * |
| 1217 | * If the passed lu_gp does NOT match the default_lu_gp, assume |
| 1218 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. |
| 1219 | */ |
| 1220 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1221 | if (lu_gp != default_lu_gp) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1222 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1223 | default_lu_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1224 | else |
| 1225 | lu_gp_mem->lu_gp = NULL; |
| 1226 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1227 | |
| 1228 | spin_lock(&lu_gp->lu_gp_lock); |
| 1229 | } |
| 1230 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1231 | |
| 1232 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
| 1233 | } |
| 1234 | |
| 1235 | void core_alua_free_lu_gp_mem(struct se_device *dev) |
| 1236 | { |
| 1237 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1238 | struct t10_alua *alua = &su_dev->t10_alua; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1239 | struct t10_alua_lu_gp *lu_gp; |
| 1240 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1241 | |
| 1242 | if (alua->alua_type != SPC3_ALUA_EMULATED) |
| 1243 | return; |
| 1244 | |
| 1245 | lu_gp_mem = dev->dev_alua_lu_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1246 | if (!lu_gp_mem) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1247 | return; |
| 1248 | |
| 1249 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) |
| 1250 | cpu_relax(); |
| 1251 | |
| 1252 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 1253 | lu_gp = lu_gp_mem->lu_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1254 | if (lu_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1255 | spin_lock(&lu_gp->lu_gp_lock); |
| 1256 | if (lu_gp_mem->lu_gp_assoc) { |
| 1257 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1258 | lu_gp->lu_gp_members--; |
| 1259 | lu_gp_mem->lu_gp_assoc = 0; |
| 1260 | } |
| 1261 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1262 | lu_gp_mem->lu_gp = NULL; |
| 1263 | } |
| 1264 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1265 | |
| 1266 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); |
| 1267 | } |
| 1268 | |
| 1269 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) |
| 1270 | { |
| 1271 | struct t10_alua_lu_gp *lu_gp; |
| 1272 | struct config_item *ci; |
| 1273 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1274 | spin_lock(&lu_gps_lock); |
| 1275 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1276 | if (!lu_gp->lu_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1277 | continue; |
| 1278 | ci = &lu_gp->lu_gp_group.cg_item; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1279 | if (!strcmp(config_item_name(ci), name)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1280 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1281 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1282 | return lu_gp; |
| 1283 | } |
| 1284 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1285 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1286 | |
| 1287 | return NULL; |
| 1288 | } |
| 1289 | |
| 1290 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) |
| 1291 | { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1292 | spin_lock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1293 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1294 | spin_unlock(&lu_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1295 | } |
| 1296 | |
| 1297 | /* |
| 1298 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| 1299 | */ |
| 1300 | void __core_alua_attach_lu_gp_mem( |
| 1301 | struct t10_alua_lu_gp_member *lu_gp_mem, |
| 1302 | struct t10_alua_lu_gp *lu_gp) |
| 1303 | { |
| 1304 | spin_lock(&lu_gp->lu_gp_lock); |
| 1305 | lu_gp_mem->lu_gp = lu_gp; |
| 1306 | lu_gp_mem->lu_gp_assoc = 1; |
| 1307 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); |
| 1308 | lu_gp->lu_gp_members++; |
| 1309 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1310 | } |
| 1311 | |
| 1312 | /* |
| 1313 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| 1314 | */ |
| 1315 | void __core_alua_drop_lu_gp_mem( |
| 1316 | struct t10_alua_lu_gp_member *lu_gp_mem, |
| 1317 | struct t10_alua_lu_gp *lu_gp) |
| 1318 | { |
| 1319 | spin_lock(&lu_gp->lu_gp_lock); |
| 1320 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1321 | lu_gp_mem->lu_gp = NULL; |
| 1322 | lu_gp_mem->lu_gp_assoc = 0; |
| 1323 | lu_gp->lu_gp_members--; |
| 1324 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1325 | } |
| 1326 | |
| 1327 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( |
| 1328 | struct se_subsystem_dev *su_dev, |
| 1329 | const char *name, |
| 1330 | int def_group) |
| 1331 | { |
| 1332 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1333 | |
| 1334 | 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] | 1335 | if (!tg_pt_gp) { |
| 1336 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1337 | return NULL; |
| 1338 | } |
| 1339 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); |
| 1340 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); |
| 1341 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 1342 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); |
| 1343 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); |
| 1344 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; |
| 1345 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
| 1346 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| 1347 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); |
| 1348 | /* |
| 1349 | * Enable both explict and implict ALUA support by default |
| 1350 | */ |
| 1351 | tg_pt_gp->tg_pt_gp_alua_access_type = |
| 1352 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; |
| 1353 | /* |
| 1354 | * Set the default Active/NonOptimized Delay in milliseconds |
| 1355 | */ |
| 1356 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; |
| 1357 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; |
| 1358 | |
| 1359 | if (def_group) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1360 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1361 | tg_pt_gp->tg_pt_gp_id = |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1362 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1363 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1364 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1365 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1366 | &su_dev->t10_alua.tg_pt_gps_list); |
| 1367 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1368 | } |
| 1369 | |
| 1370 | return tg_pt_gp; |
| 1371 | } |
| 1372 | |
| 1373 | int core_alua_set_tg_pt_gp_id( |
| 1374 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1375 | u16 tg_pt_gp_id) |
| 1376 | { |
| 1377 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 1378 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
| 1379 | u16 tg_pt_gp_id_tmp; |
| 1380 | /* |
| 1381 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. |
| 1382 | */ |
| 1383 | if (tg_pt_gp->tg_pt_gp_valid_id) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1384 | pr_warn("ALUA TG PT Group already has a valid ID," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1385 | " ignoring request\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1386 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1387 | } |
| 1388 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1389 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
| 1390 | if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1391 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1392 | " 0x0000ffff reached\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1393 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1394 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1395 | return -ENOSPC; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1396 | } |
| 1397 | again: |
| 1398 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1399 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1400 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1401 | list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1402 | tg_pt_gp_list) { |
| 1403 | 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] | 1404 | if (!tg_pt_gp_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1405 | goto again; |
| 1406 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1407 | pr_err("ALUA Target Port Group ID: %hu already" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1408 | " exists, ignoring request\n", tg_pt_gp_id); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1409 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
| 1410 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1411 | } |
| 1412 | } |
| 1413 | |
| 1414 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; |
| 1415 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
| 1416 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1417 | &su_dev->t10_alua.tg_pt_gps_list); |
| 1418 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
| 1419 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1420 | |
| 1421 | return 0; |
| 1422 | } |
| 1423 | |
| 1424 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( |
| 1425 | struct se_port *port) |
| 1426 | { |
| 1427 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1428 | |
| 1429 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, |
| 1430 | GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1431 | if (!tg_pt_gp_mem) { |
| 1432 | 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] | 1433 | return ERR_PTR(-ENOMEM); |
| 1434 | } |
| 1435 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1436 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1437 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); |
| 1438 | |
| 1439 | tg_pt_gp_mem->tg_pt = port; |
| 1440 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1441 | |
| 1442 | return tg_pt_gp_mem; |
| 1443 | } |
| 1444 | |
| 1445 | void core_alua_free_tg_pt_gp( |
| 1446 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1447 | { |
| 1448 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 1449 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
| 1450 | /* |
| 1451 | * Once we have reached this point, config_item_put() has already |
| 1452 | * been called from target_core_alua_drop_tg_pt_gp(). |
| 1453 | * |
| 1454 | * Here we remove *tg_pt_gp from the global list so that |
| 1455 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS |
| 1456 | * can be made while we are releasing struct t10_alua_tg_pt_gp. |
| 1457 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1458 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1459 | list_del(&tg_pt_gp->tg_pt_gp_list); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1460 | su_dev->t10_alua.alua_tg_pt_gps_counter--; |
| 1461 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1462 | /* |
| 1463 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by |
| 1464 | * core_alua_get_tg_pt_gp_by_name() in |
| 1465 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() |
| 1466 | * to be released with core_alua_put_tg_pt_gp_from_name(). |
| 1467 | */ |
| 1468 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) |
| 1469 | cpu_relax(); |
| 1470 | /* |
| 1471 | * Release reference to struct t10_alua_tg_pt_gp from all associated |
| 1472 | * struct se_port. |
| 1473 | */ |
| 1474 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1475 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, |
| 1476 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { |
| 1477 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| 1478 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1479 | tg_pt_gp->tg_pt_gp_members--; |
| 1480 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1481 | } |
| 1482 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1483 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1484 | * tg_pt_gp_mem is associated with a single |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1485 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
| 1486 | * core_alua_free_tg_pt_gp_mem(). |
| 1487 | * |
| 1488 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, |
| 1489 | * assume we want to re-assocate a given tg_pt_gp_mem with |
| 1490 | * default_tg_pt_gp. |
| 1491 | */ |
| 1492 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1493 | if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1494 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1495 | su_dev->t10_alua.default_tg_pt_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1496 | } else |
| 1497 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1498 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1499 | |
| 1500 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1501 | } |
| 1502 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1503 | |
| 1504 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
| 1505 | } |
| 1506 | |
| 1507 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) |
| 1508 | { |
| 1509 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1510 | struct t10_alua *alua = &su_dev->t10_alua; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1511 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1512 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1513 | |
| 1514 | if (alua->alua_type != SPC3_ALUA_EMULATED) |
| 1515 | return; |
| 1516 | |
| 1517 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1518 | if (!tg_pt_gp_mem) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1519 | return; |
| 1520 | |
| 1521 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) |
| 1522 | cpu_relax(); |
| 1523 | |
| 1524 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1525 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1526 | if (tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1527 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1528 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| 1529 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1530 | tg_pt_gp->tg_pt_gp_members--; |
| 1531 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1532 | } |
| 1533 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1534 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1535 | } |
| 1536 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1537 | |
| 1538 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); |
| 1539 | } |
| 1540 | |
| 1541 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( |
| 1542 | struct se_subsystem_dev *su_dev, |
| 1543 | const char *name) |
| 1544 | { |
| 1545 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1546 | struct config_item *ci; |
| 1547 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1548 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
| 1549 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1550 | tg_pt_gp_list) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1551 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1552 | continue; |
| 1553 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1554 | if (!strcmp(config_item_name(ci), name)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1555 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1556 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1557 | return tg_pt_gp; |
| 1558 | } |
| 1559 | } |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1560 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1561 | |
| 1562 | return NULL; |
| 1563 | } |
| 1564 | |
| 1565 | static void core_alua_put_tg_pt_gp_from_name( |
| 1566 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1567 | { |
| 1568 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 1569 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1570 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1571 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1572 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1573 | } |
| 1574 | |
| 1575 | /* |
| 1576 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| 1577 | */ |
| 1578 | void __core_alua_attach_tg_pt_gp_mem( |
| 1579 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1580 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1581 | { |
| 1582 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1583 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; |
| 1584 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; |
| 1585 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, |
| 1586 | &tg_pt_gp->tg_pt_gp_mem_list); |
| 1587 | tg_pt_gp->tg_pt_gp_members++; |
| 1588 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1589 | } |
| 1590 | |
| 1591 | /* |
| 1592 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| 1593 | */ |
| 1594 | static void __core_alua_drop_tg_pt_gp_mem( |
| 1595 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1596 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1597 | { |
| 1598 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1599 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1600 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1601 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1602 | tg_pt_gp->tg_pt_gp_members--; |
| 1603 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1604 | } |
| 1605 | |
| 1606 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) |
| 1607 | { |
| 1608 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| 1609 | struct config_item *tg_pt_ci; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1610 | struct t10_alua *alua = &su_dev->t10_alua; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1611 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1612 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1613 | ssize_t len = 0; |
| 1614 | |
| 1615 | if (alua->alua_type != SPC3_ALUA_EMULATED) |
| 1616 | return len; |
| 1617 | |
| 1618 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1619 | if (!tg_pt_gp_mem) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1620 | return len; |
| 1621 | |
| 1622 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1623 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1624 | if (tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1625 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
| 1626 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" |
| 1627 | " %hu\nTG Port Primary Access State: %s\nTG Port " |
| 1628 | "Primary Access Status: %s\nTG Port Secondary Access" |
| 1629 | " State: %s\nTG Port Secondary Access Status: %s\n", |
| 1630 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, |
| 1631 | core_alua_dump_state(atomic_read( |
| 1632 | &tg_pt_gp->tg_pt_gp_alua_access_state)), |
| 1633 | core_alua_dump_status( |
| 1634 | tg_pt_gp->tg_pt_gp_alua_access_status), |
| 1635 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? |
| 1636 | "Offline" : "None", |
| 1637 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); |
| 1638 | } |
| 1639 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1640 | |
| 1641 | return len; |
| 1642 | } |
| 1643 | |
| 1644 | ssize_t core_alua_store_tg_pt_gp_info( |
| 1645 | struct se_port *port, |
| 1646 | const char *page, |
| 1647 | size_t count) |
| 1648 | { |
| 1649 | struct se_portal_group *tpg; |
| 1650 | struct se_lun *lun; |
| 1651 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| 1652 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
| 1653 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1654 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; |
| 1655 | int move = 0; |
| 1656 | |
| 1657 | tpg = port->sep_tpg; |
| 1658 | lun = port->sep_lun; |
| 1659 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1660 | if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1661 | pr_warn("SPC3_ALUA_EMULATED not enabled for" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1662 | " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
| 1663 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1664 | config_item_name(&lun->lun_group.cg_item)); |
| 1665 | return -EINVAL; |
| 1666 | } |
| 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 | */ |
| 1684 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, |
| 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 | } |
| 1689 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1690 | if (!tg_pt_gp_mem) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1691 | if (tg_pt_gp_new) |
| 1692 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1693 | pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1694 | return -EINVAL; |
| 1695 | } |
| 1696 | |
| 1697 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1698 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1699 | if (tg_pt_gp) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1700 | /* |
| 1701 | * Clearing an existing tg_pt_gp association, and replacing |
| 1702 | * with the default_tg_pt_gp. |
| 1703 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1704 | if (!tg_pt_gp_new) { |
| 1705 | pr_debug("Target_Core_ConfigFS: Moving" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1706 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
| 1707 | " alua/%s, ID: %hu back to" |
| 1708 | " default_tg_pt_gp\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1709 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
| 1710 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1711 | config_item_name(&lun->lun_group.cg_item), |
| 1712 | config_item_name( |
| 1713 | &tg_pt_gp->tg_pt_gp_group.cg_item), |
| 1714 | tg_pt_gp->tg_pt_gp_id); |
| 1715 | |
| 1716 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); |
| 1717 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1718 | su_dev->t10_alua.default_tg_pt_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1719 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1720 | |
| 1721 | return count; |
| 1722 | } |
| 1723 | /* |
| 1724 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp |
| 1725 | */ |
| 1726 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); |
| 1727 | move = 1; |
| 1728 | } |
| 1729 | /* |
| 1730 | * Associate tg_pt_gp_mem with tg_pt_gp_new. |
| 1731 | */ |
| 1732 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); |
| 1733 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1734 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1735 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1736 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
| 1737 | tpg->se_tpg_tfo->tpg_get_tag(tpg), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1738 | config_item_name(&lun->lun_group.cg_item), |
| 1739 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), |
| 1740 | tg_pt_gp_new->tg_pt_gp_id); |
| 1741 | |
| 1742 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
| 1743 | return count; |
| 1744 | } |
| 1745 | |
| 1746 | ssize_t core_alua_show_access_type( |
| 1747 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1748 | char *page) |
| 1749 | { |
| 1750 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && |
| 1751 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) |
| 1752 | return sprintf(page, "Implict and Explict\n"); |
| 1753 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) |
| 1754 | return sprintf(page, "Implict\n"); |
| 1755 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) |
| 1756 | return sprintf(page, "Explict\n"); |
| 1757 | else |
| 1758 | return sprintf(page, "None\n"); |
| 1759 | } |
| 1760 | |
| 1761 | ssize_t core_alua_store_access_type( |
| 1762 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1763 | const char *page, |
| 1764 | size_t count) |
| 1765 | { |
| 1766 | unsigned long tmp; |
| 1767 | int ret; |
| 1768 | |
| 1769 | ret = strict_strtoul(page, 0, &tmp); |
| 1770 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1771 | pr_err("Unable to extract alua_access_type\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1772 | return -EINVAL; |
| 1773 | } |
| 1774 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1775 | pr_err("Illegal value for alua_access_type:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1776 | " %lu\n", tmp); |
| 1777 | return -EINVAL; |
| 1778 | } |
| 1779 | if (tmp == 3) |
| 1780 | tg_pt_gp->tg_pt_gp_alua_access_type = |
| 1781 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; |
| 1782 | else if (tmp == 2) |
| 1783 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; |
| 1784 | else if (tmp == 1) |
| 1785 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; |
| 1786 | else |
| 1787 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; |
| 1788 | |
| 1789 | return count; |
| 1790 | } |
| 1791 | |
| 1792 | ssize_t core_alua_show_nonop_delay_msecs( |
| 1793 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1794 | char *page) |
| 1795 | { |
| 1796 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); |
| 1797 | } |
| 1798 | |
| 1799 | ssize_t core_alua_store_nonop_delay_msecs( |
| 1800 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1801 | const char *page, |
| 1802 | size_t count) |
| 1803 | { |
| 1804 | unsigned long tmp; |
| 1805 | int ret; |
| 1806 | |
| 1807 | ret = strict_strtoul(page, 0, &tmp); |
| 1808 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1809 | pr_err("Unable to extract nonop_delay_msecs\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1810 | return -EINVAL; |
| 1811 | } |
| 1812 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1813 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1814 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
| 1815 | ALUA_MAX_NONOP_DELAY_MSECS); |
| 1816 | return -EINVAL; |
| 1817 | } |
| 1818 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; |
| 1819 | |
| 1820 | return count; |
| 1821 | } |
| 1822 | |
| 1823 | ssize_t core_alua_show_trans_delay_msecs( |
| 1824 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1825 | char *page) |
| 1826 | { |
| 1827 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| 1828 | } |
| 1829 | |
| 1830 | ssize_t core_alua_store_trans_delay_msecs( |
| 1831 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1832 | const char *page, |
| 1833 | size_t count) |
| 1834 | { |
| 1835 | unsigned long tmp; |
| 1836 | int ret; |
| 1837 | |
| 1838 | ret = strict_strtoul(page, 0, &tmp); |
| 1839 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1840 | pr_err("Unable to extract trans_delay_msecs\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1841 | return -EINVAL; |
| 1842 | } |
| 1843 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1844 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1845 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
| 1846 | ALUA_MAX_TRANS_DELAY_MSECS); |
| 1847 | return -EINVAL; |
| 1848 | } |
| 1849 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; |
| 1850 | |
| 1851 | return count; |
| 1852 | } |
| 1853 | |
| 1854 | ssize_t core_alua_show_preferred_bit( |
| 1855 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1856 | char *page) |
| 1857 | { |
| 1858 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); |
| 1859 | } |
| 1860 | |
| 1861 | ssize_t core_alua_store_preferred_bit( |
| 1862 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1863 | const char *page, |
| 1864 | size_t count) |
| 1865 | { |
| 1866 | unsigned long tmp; |
| 1867 | int ret; |
| 1868 | |
| 1869 | ret = strict_strtoul(page, 0, &tmp); |
| 1870 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1871 | pr_err("Unable to extract preferred ALUA value\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1872 | return -EINVAL; |
| 1873 | } |
| 1874 | if ((tmp != 0) && (tmp != 1)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1875 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1876 | return -EINVAL; |
| 1877 | } |
| 1878 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; |
| 1879 | |
| 1880 | return count; |
| 1881 | } |
| 1882 | |
| 1883 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) |
| 1884 | { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1885 | if (!lun->lun_sep) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1886 | return -ENODEV; |
| 1887 | |
| 1888 | return sprintf(page, "%d\n", |
| 1889 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); |
| 1890 | } |
| 1891 | |
| 1892 | ssize_t core_alua_store_offline_bit( |
| 1893 | struct se_lun *lun, |
| 1894 | const char *page, |
| 1895 | size_t count) |
| 1896 | { |
| 1897 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1898 | unsigned long tmp; |
| 1899 | int ret; |
| 1900 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1901 | if (!lun->lun_sep) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1902 | return -ENODEV; |
| 1903 | |
| 1904 | ret = strict_strtoul(page, 0, &tmp); |
| 1905 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1906 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1907 | return -EINVAL; |
| 1908 | } |
| 1909 | if ((tmp != 0) && (tmp != 1)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1910 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1911 | tmp); |
| 1912 | return -EINVAL; |
| 1913 | } |
| 1914 | 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] | 1915 | if (!tg_pt_gp_mem) { |
| 1916 | pr_err("Unable to locate *tg_pt_gp_mem\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1917 | return -EINVAL; |
| 1918 | } |
| 1919 | |
| 1920 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, |
| 1921 | lun->lun_sep, 0, (int)tmp); |
| 1922 | if (ret < 0) |
| 1923 | return -EINVAL; |
| 1924 | |
| 1925 | return count; |
| 1926 | } |
| 1927 | |
| 1928 | ssize_t core_alua_show_secondary_status( |
| 1929 | struct se_lun *lun, |
| 1930 | char *page) |
| 1931 | { |
| 1932 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); |
| 1933 | } |
| 1934 | |
| 1935 | ssize_t core_alua_store_secondary_status( |
| 1936 | struct se_lun *lun, |
| 1937 | const char *page, |
| 1938 | size_t count) |
| 1939 | { |
| 1940 | unsigned long tmp; |
| 1941 | int ret; |
| 1942 | |
| 1943 | ret = strict_strtoul(page, 0, &tmp); |
| 1944 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1945 | pr_err("Unable to extract alua_tg_pt_status\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1946 | return -EINVAL; |
| 1947 | } |
| 1948 | if ((tmp != ALUA_STATUS_NONE) && |
| 1949 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && |
| 1950 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1951 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1952 | tmp); |
| 1953 | return -EINVAL; |
| 1954 | } |
| 1955 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; |
| 1956 | |
| 1957 | return count; |
| 1958 | } |
| 1959 | |
| 1960 | ssize_t core_alua_show_secondary_write_metadata( |
| 1961 | struct se_lun *lun, |
| 1962 | char *page) |
| 1963 | { |
| 1964 | return sprintf(page, "%d\n", |
| 1965 | lun->lun_sep->sep_tg_pt_secondary_write_md); |
| 1966 | } |
| 1967 | |
| 1968 | ssize_t core_alua_store_secondary_write_metadata( |
| 1969 | struct se_lun *lun, |
| 1970 | const char *page, |
| 1971 | size_t count) |
| 1972 | { |
| 1973 | unsigned long tmp; |
| 1974 | int ret; |
| 1975 | |
| 1976 | ret = strict_strtoul(page, 0, &tmp); |
| 1977 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1978 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1979 | return -EINVAL; |
| 1980 | } |
| 1981 | if ((tmp != 0) && (tmp != 1)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1982 | pr_err("Illegal value for alua_tg_pt_write_md:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1983 | " %lu\n", tmp); |
| 1984 | return -EINVAL; |
| 1985 | } |
| 1986 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; |
| 1987 | |
| 1988 | return count; |
| 1989 | } |
| 1990 | |
| 1991 | int core_setup_alua(struct se_device *dev, int force_pt) |
| 1992 | { |
| 1993 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1994 | struct t10_alua *alua = &su_dev->t10_alua; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1995 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1996 | /* |
| 1997 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic |
| 1998 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can |
| 1999 | * cause a problem because libata and some SATA RAID HBAs appear |
| 2000 | * under Linux/SCSI, but emulate SCSI logic themselves. |
| 2001 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2002 | if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
| 2003 | !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2004 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
| 2005 | alua->alua_state_check = &core_alua_state_check_nop; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2006 | pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2007 | " emulation\n", dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2008 | return 0; |
| 2009 | } |
| 2010 | /* |
| 2011 | * If SPC-3 or above is reported by real or emulated struct se_device, |
| 2012 | * use emulated ALUA. |
| 2013 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2014 | if (dev->transport->get_device_rev(dev) >= SCSI_3) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2015 | pr_debug("%s: Enabling ALUA Emulation for SPC-3" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2016 | " device\n", dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2017 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2018 | * Associate this struct se_device with the default ALUA |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2019 | * LUN Group. |
| 2020 | */ |
| 2021 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2022 | if (IS_ERR(lu_gp_mem)) |
| 2023 | return PTR_ERR(lu_gp_mem); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2024 | |
| 2025 | alua->alua_type = SPC3_ALUA_EMULATED; |
| 2026 | alua->alua_state_check = &core_alua_state_check; |
| 2027 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 2028 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2029 | default_lu_gp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2030 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 2031 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2032 | pr_debug("%s: Adding to default ALUA LU Group:" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2033 | " core/alua/lu_gps/default_lu_gp\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2034 | dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2035 | } else { |
| 2036 | alua->alua_type = SPC2_ALUA_DISABLED; |
| 2037 | alua->alua_state_check = &core_alua_state_check_nop; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2038 | pr_debug("%s: Disabling ALUA Emulation for SPC-2" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2039 | " device\n", dev->transport->name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2040 | } |
| 2041 | |
| 2042 | return 0; |
| 2043 | } |