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 | |
| 27 | #include <linux/version.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/spinlock.h> |
| 30 | #include <linux/configfs.h> |
| 31 | #include <scsi/scsi.h> |
| 32 | #include <scsi/scsi_cmnd.h> |
| 33 | |
| 34 | #include <target/target_core_base.h> |
| 35 | #include <target/target_core_device.h> |
| 36 | #include <target/target_core_transport.h> |
| 37 | #include <target/target_core_fabric_ops.h> |
| 38 | #include <target/target_core_configfs.h> |
| 39 | |
| 40 | #include "target_core_alua.h" |
| 41 | #include "target_core_hba.h" |
| 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 | |
| 49 | /* |
| 50 | * REPORT_TARGET_PORT_GROUPS |
| 51 | * |
| 52 | * See spc4r17 section 6.27 |
| 53 | */ |
| 54 | int core_emulate_report_target_port_groups(struct se_cmd *cmd) |
| 55 | { |
| 56 | struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev; |
| 57 | struct se_port *port; |
| 58 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 59 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 60 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 61 | u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
| 62 | Target port group descriptor */ |
| 63 | |
| 64 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 65 | list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->tg_pt_gps_list, |
| 66 | tg_pt_gp_list) { |
| 67 | /* |
| 68 | * PREF: Preferred target port bit, determine if this |
| 69 | * bit should be set for port group. |
| 70 | */ |
| 71 | if (tg_pt_gp->tg_pt_gp_pref) |
| 72 | buf[off] = 0x80; |
| 73 | /* |
| 74 | * Set the ASYMMETRIC ACCESS State |
| 75 | */ |
| 76 | buf[off++] |= (atomic_read( |
| 77 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); |
| 78 | /* |
| 79 | * Set supported ASYMMETRIC ACCESS State bits |
| 80 | */ |
| 81 | buf[off] = 0x80; /* T_SUP */ |
| 82 | buf[off] |= 0x40; /* O_SUP */ |
| 83 | buf[off] |= 0x8; /* U_SUP */ |
| 84 | buf[off] |= 0x4; /* S_SUP */ |
| 85 | buf[off] |= 0x2; /* AN_SUP */ |
| 86 | buf[off++] |= 0x1; /* AO_SUP */ |
| 87 | /* |
| 88 | * TARGET PORT GROUP |
| 89 | */ |
| 90 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); |
| 91 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); |
| 92 | |
| 93 | off++; /* Skip over Reserved */ |
| 94 | /* |
| 95 | * STATUS CODE |
| 96 | */ |
| 97 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); |
| 98 | /* |
| 99 | * Vendor Specific field |
| 100 | */ |
| 101 | buf[off++] = 0x00; |
| 102 | /* |
| 103 | * TARGET PORT COUNT |
| 104 | */ |
| 105 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); |
| 106 | rd_len += 8; |
| 107 | |
| 108 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 109 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| 110 | tg_pt_gp_mem_list) { |
| 111 | port = tg_pt_gp_mem->tg_pt; |
| 112 | /* |
| 113 | * Start Target Port descriptor format |
| 114 | * |
| 115 | * See spc4r17 section 6.2.7 Table 247 |
| 116 | */ |
| 117 | off += 2; /* Skip over Obsolete */ |
| 118 | /* |
| 119 | * Set RELATIVE TARGET PORT IDENTIFIER |
| 120 | */ |
| 121 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); |
| 122 | buf[off++] = (port->sep_rtpi & 0xff); |
| 123 | rd_len += 4; |
| 124 | } |
| 125 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 126 | } |
| 127 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 128 | /* |
| 129 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload |
| 130 | */ |
| 131 | buf[0] = ((rd_len >> 24) & 0xff); |
| 132 | buf[1] = ((rd_len >> 16) & 0xff); |
| 133 | buf[2] = ((rd_len >> 8) & 0xff); |
| 134 | buf[3] = (rd_len & 0xff); |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. |
| 141 | * |
| 142 | * See spc4r17 section 6.35 |
| 143 | */ |
| 144 | int core_emulate_set_target_port_groups(struct se_cmd *cmd) |
| 145 | { |
| 146 | struct se_device *dev = SE_DEV(cmd); |
| 147 | struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev; |
| 148 | struct se_port *port, *l_port = SE_LUN(cmd)->lun_sep; |
| 149 | struct se_node_acl *nacl = SE_SESS(cmd)->se_node_acl; |
| 150 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
| 151 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; |
| 152 | unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 153 | unsigned char *ptr = &buf[4]; /* Skip over RESERVED area in header */ |
| 154 | u32 len = 4; /* Skip over RESERVED area in header */ |
| 155 | int alua_access_state, primary = 0, rc; |
| 156 | u16 tg_pt_id, rtpi; |
| 157 | |
| 158 | if (!(l_port)) |
| 159 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 160 | /* |
| 161 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed |
| 162 | * for the local tg_pt_gp. |
| 163 | */ |
| 164 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; |
| 165 | if (!(l_tg_pt_gp_mem)) { |
| 166 | printk(KERN_ERR "Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); |
| 167 | return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| 168 | } |
| 169 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 170 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; |
| 171 | if (!(l_tg_pt_gp)) { |
| 172 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 173 | printk(KERN_ERR "Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
| 174 | return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| 175 | } |
| 176 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); |
| 177 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 178 | |
| 179 | if (!(rc)) { |
| 180 | printk(KERN_INFO "Unable to process SET_TARGET_PORT_GROUPS" |
| 181 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
| 182 | return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| 183 | } |
| 184 | |
| 185 | while (len < cmd->data_length) { |
| 186 | alua_access_state = (ptr[0] & 0x0f); |
| 187 | /* |
| 188 | * Check the received ALUA access state, and determine if |
| 189 | * the state is a primary or secondary target port asymmetric |
| 190 | * access state. |
| 191 | */ |
| 192 | rc = core_alua_check_transition(alua_access_state, &primary); |
| 193 | if (rc != 0) { |
| 194 | /* |
| 195 | * If the SET TARGET PORT GROUPS attempts to establish |
| 196 | * an invalid combination of target port asymmetric |
| 197 | * access states or attempts to establish an |
| 198 | * unsupported target port asymmetric access state, |
| 199 | * then the command shall be terminated with CHECK |
| 200 | * CONDITION status, with the sense key set to ILLEGAL |
| 201 | * REQUEST, and the additional sense code set to INVALID |
| 202 | * FIELD IN PARAMETER LIST. |
| 203 | */ |
| 204 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 205 | } |
| 206 | rc = -1; |
| 207 | /* |
| 208 | * If the ASYMMETRIC ACCESS STATE field (see table 267) |
| 209 | * specifies a primary target port asymmetric access state, |
| 210 | * then the TARGET PORT GROUP OR TARGET PORT field specifies |
| 211 | * a primary target port group for which the primary target |
| 212 | * port asymmetric access state shall be changed. If the |
| 213 | * ASYMMETRIC ACCESS STATE field specifies a secondary target |
| 214 | * port asymmetric access state, then the TARGET PORT GROUP OR |
| 215 | * TARGET PORT field specifies the relative target port |
| 216 | * identifier (see 3.1.120) of the target port for which the |
| 217 | * secondary target port asymmetric access state shall be |
| 218 | * changed. |
| 219 | */ |
| 220 | if (primary) { |
| 221 | tg_pt_id = ((ptr[2] << 8) & 0xff); |
| 222 | tg_pt_id |= (ptr[3] & 0xff); |
| 223 | /* |
| 224 | * Locate the matching target port group ID from |
| 225 | * the global tg_pt_gp list |
| 226 | */ |
| 227 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 228 | list_for_each_entry(tg_pt_gp, |
| 229 | &T10_ALUA(su_dev)->tg_pt_gps_list, |
| 230 | tg_pt_gp_list) { |
| 231 | if (!(tg_pt_gp->tg_pt_gp_valid_id)) |
| 232 | continue; |
| 233 | |
| 234 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) |
| 235 | continue; |
| 236 | |
| 237 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 238 | smp_mb__after_atomic_inc(); |
| 239 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 240 | |
| 241 | rc = core_alua_do_port_transition(tg_pt_gp, |
| 242 | dev, l_port, nacl, |
| 243 | alua_access_state, 1); |
| 244 | |
| 245 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 246 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 247 | smp_mb__after_atomic_dec(); |
| 248 | break; |
| 249 | } |
| 250 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 251 | /* |
| 252 | * If not matching target port group ID can be located |
| 253 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST |
| 254 | */ |
| 255 | if (rc != 0) |
| 256 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 257 | } else { |
| 258 | /* |
| 259 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify |
| 260 | * the Target Port in question for the the incoming |
| 261 | * SET_TARGET_PORT_GROUPS op. |
| 262 | */ |
| 263 | rtpi = ((ptr[2] << 8) & 0xff); |
| 264 | rtpi |= (ptr[3] & 0xff); |
| 265 | /* |
| 266 | * Locate the matching relative target port identifer |
| 267 | * for the struct se_device storage object. |
| 268 | */ |
| 269 | spin_lock(&dev->se_port_lock); |
| 270 | list_for_each_entry(port, &dev->dev_sep_list, |
| 271 | sep_list) { |
| 272 | if (port->sep_rtpi != rtpi) |
| 273 | continue; |
| 274 | |
| 275 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 276 | spin_unlock(&dev->se_port_lock); |
| 277 | |
| 278 | rc = core_alua_set_tg_pt_secondary_state( |
| 279 | tg_pt_gp_mem, port, 1, 1); |
| 280 | |
| 281 | spin_lock(&dev->se_port_lock); |
| 282 | break; |
| 283 | } |
| 284 | spin_unlock(&dev->se_port_lock); |
| 285 | /* |
| 286 | * If not matching relative target port identifier can |
| 287 | * be located, throw an exception with ASCQ: |
| 288 | * INVALID_PARAMETER_LIST |
| 289 | */ |
| 290 | if (rc != 0) |
| 291 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
| 292 | } |
| 293 | |
| 294 | ptr += 4; |
| 295 | len += 4; |
| 296 | } |
| 297 | |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static inline int core_alua_state_nonoptimized( |
| 302 | struct se_cmd *cmd, |
| 303 | unsigned char *cdb, |
| 304 | int nonop_delay_msecs, |
| 305 | u8 *alua_ascq) |
| 306 | { |
| 307 | /* |
| 308 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked |
| 309 | * later to determine if processing of this cmd needs to be |
| 310 | * temporarily delayed for the Active/NonOptimized primary access state. |
| 311 | */ |
| 312 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; |
| 313 | cmd->alua_nonop_delay = nonop_delay_msecs; |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static inline int core_alua_state_standby( |
| 318 | struct se_cmd *cmd, |
| 319 | unsigned char *cdb, |
| 320 | u8 *alua_ascq) |
| 321 | { |
| 322 | /* |
| 323 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by |
| 324 | * spc4r17 section 5.9.2.4.4 |
| 325 | */ |
| 326 | switch (cdb[0]) { |
| 327 | case INQUIRY: |
| 328 | case LOG_SELECT: |
| 329 | case LOG_SENSE: |
| 330 | case MODE_SELECT: |
| 331 | case MODE_SENSE: |
| 332 | case REPORT_LUNS: |
| 333 | case RECEIVE_DIAGNOSTIC: |
| 334 | case SEND_DIAGNOSTIC: |
| 335 | case MAINTENANCE_IN: |
| 336 | switch (cdb[1]) { |
| 337 | case MI_REPORT_TARGET_PGS: |
| 338 | return 0; |
| 339 | default: |
| 340 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 341 | return 1; |
| 342 | } |
| 343 | case MAINTENANCE_OUT: |
| 344 | switch (cdb[1]) { |
| 345 | case MO_SET_TARGET_PGS: |
| 346 | return 0; |
| 347 | default: |
| 348 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 349 | return 1; |
| 350 | } |
| 351 | case REQUEST_SENSE: |
| 352 | case PERSISTENT_RESERVE_IN: |
| 353 | case PERSISTENT_RESERVE_OUT: |
| 354 | case READ_BUFFER: |
| 355 | case WRITE_BUFFER: |
| 356 | return 0; |
| 357 | default: |
| 358 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; |
| 359 | return 1; |
| 360 | } |
| 361 | |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | static inline int core_alua_state_unavailable( |
| 366 | struct se_cmd *cmd, |
| 367 | unsigned char *cdb, |
| 368 | u8 *alua_ascq) |
| 369 | { |
| 370 | /* |
| 371 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by |
| 372 | * spc4r17 section 5.9.2.4.5 |
| 373 | */ |
| 374 | switch (cdb[0]) { |
| 375 | case INQUIRY: |
| 376 | case REPORT_LUNS: |
| 377 | case MAINTENANCE_IN: |
| 378 | switch (cdb[1]) { |
| 379 | case MI_REPORT_TARGET_PGS: |
| 380 | return 0; |
| 381 | default: |
| 382 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 383 | return 1; |
| 384 | } |
| 385 | case MAINTENANCE_OUT: |
| 386 | switch (cdb[1]) { |
| 387 | case MO_SET_TARGET_PGS: |
| 388 | return 0; |
| 389 | default: |
| 390 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 391 | return 1; |
| 392 | } |
| 393 | case REQUEST_SENSE: |
| 394 | case READ_BUFFER: |
| 395 | case WRITE_BUFFER: |
| 396 | return 0; |
| 397 | default: |
| 398 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; |
| 399 | return 1; |
| 400 | } |
| 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | static inline int core_alua_state_transition( |
| 406 | struct se_cmd *cmd, |
| 407 | unsigned char *cdb, |
| 408 | u8 *alua_ascq) |
| 409 | { |
| 410 | /* |
| 411 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by |
| 412 | * spc4r17 section 5.9.2.5 |
| 413 | */ |
| 414 | switch (cdb[0]) { |
| 415 | case INQUIRY: |
| 416 | case REPORT_LUNS: |
| 417 | case MAINTENANCE_IN: |
| 418 | switch (cdb[1]) { |
| 419 | case MI_REPORT_TARGET_PGS: |
| 420 | return 0; |
| 421 | default: |
| 422 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| 423 | return 1; |
| 424 | } |
| 425 | case REQUEST_SENSE: |
| 426 | case READ_BUFFER: |
| 427 | case WRITE_BUFFER: |
| 428 | return 0; |
| 429 | default: |
| 430 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; |
| 431 | return 1; |
| 432 | } |
| 433 | |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED |
| 439 | * in transport_cmd_sequencer(). This function is assigned to |
| 440 | * struct t10_alua *->state_check() in core_setup_alua() |
| 441 | */ |
| 442 | static int core_alua_state_check_nop( |
| 443 | struct se_cmd *cmd, |
| 444 | unsigned char *cdb, |
| 445 | u8 *alua_ascq) |
| 446 | { |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). |
| 452 | * This function is assigned to struct t10_alua *->state_check() in |
| 453 | * core_setup_alua() |
| 454 | * |
| 455 | * Also, this function can return three different return codes to |
| 456 | * signal transport_generic_cmd_sequencer() |
| 457 | * |
| 458 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
| 459 | * return 0: Used to signal success |
| 460 | * reutrn -1: Used to signal failure, and invalid cdb field |
| 461 | */ |
| 462 | static int core_alua_state_check( |
| 463 | struct se_cmd *cmd, |
| 464 | unsigned char *cdb, |
| 465 | u8 *alua_ascq) |
| 466 | { |
| 467 | struct se_lun *lun = SE_LUN(cmd); |
| 468 | struct se_port *port = lun->lun_sep; |
| 469 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 470 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 471 | int out_alua_state, nonop_delay_msecs; |
| 472 | |
| 473 | if (!(port)) |
| 474 | return 0; |
| 475 | /* |
| 476 | * First, check for a struct se_port specific secondary ALUA target port |
| 477 | * access state: OFFLINE |
| 478 | */ |
| 479 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { |
| 480 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
| 481 | printk(KERN_INFO "ALUA: Got secondary offline status for local" |
| 482 | " target port\n"); |
| 483 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
| 484 | return 1; |
| 485 | } |
| 486 | /* |
| 487 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the |
| 488 | * ALUA target port group, to obtain current ALUA access state. |
| 489 | * Otherwise look for the underlying struct se_device association with |
| 490 | * a ALUA logical unit group. |
| 491 | */ |
| 492 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 493 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 494 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 495 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| 496 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; |
| 497 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 498 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 499 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
| 500 | * statement so the compiler knows explicitly to check this case first. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 501 | * For the Optimized ALUA access state case, we want to process the |
| 502 | * incoming fabric cmd ASAP.. |
| 503 | */ |
| 504 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) |
| 505 | return 0; |
| 506 | |
| 507 | switch (out_alua_state) { |
| 508 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 509 | return core_alua_state_nonoptimized(cmd, cdb, |
| 510 | nonop_delay_msecs, alua_ascq); |
| 511 | case ALUA_ACCESS_STATE_STANDBY: |
| 512 | return core_alua_state_standby(cmd, cdb, alua_ascq); |
| 513 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 514 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); |
| 515 | case ALUA_ACCESS_STATE_TRANSITION: |
| 516 | return core_alua_state_transition(cmd, cdb, alua_ascq); |
| 517 | /* |
| 518 | * OFFLINE is a secondary ALUA target port group access state, that is |
| 519 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 |
| 520 | */ |
| 521 | case ALUA_ACCESS_STATE_OFFLINE: |
| 522 | default: |
| 523 | printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", |
| 524 | out_alua_state); |
| 525 | return -1; |
| 526 | } |
| 527 | |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Check implict and explict ALUA state change request. |
| 533 | */ |
| 534 | static int core_alua_check_transition(int state, int *primary) |
| 535 | { |
| 536 | switch (state) { |
| 537 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| 538 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 539 | case ALUA_ACCESS_STATE_STANDBY: |
| 540 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 541 | /* |
| 542 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are |
| 543 | * defined as primary target port asymmetric access states. |
| 544 | */ |
| 545 | *primary = 1; |
| 546 | break; |
| 547 | case ALUA_ACCESS_STATE_OFFLINE: |
| 548 | /* |
| 549 | * OFFLINE state is defined as a secondary target port |
| 550 | * asymmetric access state. |
| 551 | */ |
| 552 | *primary = 0; |
| 553 | break; |
| 554 | default: |
| 555 | printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", state); |
| 556 | return -1; |
| 557 | } |
| 558 | |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | static char *core_alua_dump_state(int state) |
| 563 | { |
| 564 | switch (state) { |
| 565 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: |
| 566 | return "Active/Optimized"; |
| 567 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: |
| 568 | return "Active/NonOptimized"; |
| 569 | case ALUA_ACCESS_STATE_STANDBY: |
| 570 | return "Standby"; |
| 571 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
| 572 | return "Unavailable"; |
| 573 | case ALUA_ACCESS_STATE_OFFLINE: |
| 574 | return "Offline"; |
| 575 | default: |
| 576 | return "Unknown"; |
| 577 | } |
| 578 | |
| 579 | return NULL; |
| 580 | } |
| 581 | |
| 582 | char *core_alua_dump_status(int status) |
| 583 | { |
| 584 | switch (status) { |
| 585 | case ALUA_STATUS_NONE: |
| 586 | return "None"; |
| 587 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: |
| 588 | return "Altered by Explict STPG"; |
| 589 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: |
| 590 | return "Altered by Implict ALUA"; |
| 591 | default: |
| 592 | return "Unknown"; |
| 593 | } |
| 594 | |
| 595 | return NULL; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * Used by fabric modules to determine when we need to delay processing |
| 600 | * for the Active/NonOptimized paths.. |
| 601 | */ |
| 602 | int core_alua_check_nonop_delay( |
| 603 | struct se_cmd *cmd) |
| 604 | { |
| 605 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) |
| 606 | return 0; |
| 607 | if (in_interrupt()) |
| 608 | return 0; |
| 609 | /* |
| 610 | * The ALUA Active/NonOptimized access state delay can be disabled |
| 611 | * in via configfs with a value of zero |
| 612 | */ |
| 613 | if (!(cmd->alua_nonop_delay)) |
| 614 | return 0; |
| 615 | /* |
| 616 | * struct se_cmd->alua_nonop_delay gets set by a target port group |
| 617 | * defined interval in core_alua_state_nonoptimized() |
| 618 | */ |
| 619 | msleep_interruptible(cmd->alua_nonop_delay); |
| 620 | return 0; |
| 621 | } |
| 622 | EXPORT_SYMBOL(core_alua_check_nonop_delay); |
| 623 | |
| 624 | /* |
| 625 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex |
| 626 | * |
| 627 | */ |
| 628 | static int core_alua_write_tpg_metadata( |
| 629 | const char *path, |
| 630 | unsigned char *md_buf, |
| 631 | u32 md_buf_len) |
| 632 | { |
| 633 | mm_segment_t old_fs; |
| 634 | struct file *file; |
| 635 | struct iovec iov[1]; |
| 636 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; |
| 637 | |
| 638 | memset(iov, 0, sizeof(struct iovec)); |
| 639 | |
| 640 | file = filp_open(path, flags, 0600); |
| 641 | if (IS_ERR(file) || !file || !file->f_dentry) { |
| 642 | printk(KERN_ERR "filp_open(%s) for ALUA metadata failed\n", |
| 643 | path); |
| 644 | return -ENODEV; |
| 645 | } |
| 646 | |
| 647 | iov[0].iov_base = &md_buf[0]; |
| 648 | iov[0].iov_len = md_buf_len; |
| 649 | |
| 650 | old_fs = get_fs(); |
| 651 | set_fs(get_ds()); |
| 652 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); |
| 653 | set_fs(old_fs); |
| 654 | |
| 655 | if (ret < 0) { |
| 656 | printk(KERN_ERR "Error writing ALUA metadata file: %s\n", path); |
| 657 | filp_close(file, NULL); |
| 658 | return -EIO; |
| 659 | } |
| 660 | filp_close(file, NULL); |
| 661 | |
| 662 | return 0; |
| 663 | } |
| 664 | |
| 665 | /* |
| 666 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held |
| 667 | */ |
| 668 | static int core_alua_update_tpg_primary_metadata( |
| 669 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 670 | int primary_state, |
| 671 | unsigned char *md_buf) |
| 672 | { |
| 673 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 674 | struct t10_wwn *wwn = &su_dev->t10_wwn; |
| 675 | char path[ALUA_METADATA_PATH_LEN]; |
| 676 | int len; |
| 677 | |
| 678 | memset(path, 0, ALUA_METADATA_PATH_LEN); |
| 679 | |
| 680 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, |
| 681 | "tg_pt_gp_id=%hu\n" |
| 682 | "alua_access_state=0x%02x\n" |
| 683 | "alua_access_status=0x%02x\n", |
| 684 | tg_pt_gp->tg_pt_gp_id, primary_state, |
| 685 | tg_pt_gp->tg_pt_gp_alua_access_status); |
| 686 | |
| 687 | snprintf(path, ALUA_METADATA_PATH_LEN, |
| 688 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], |
| 689 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); |
| 690 | |
| 691 | return core_alua_write_tpg_metadata(path, md_buf, len); |
| 692 | } |
| 693 | |
| 694 | static int core_alua_do_transition_tg_pt( |
| 695 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 696 | struct se_port *l_port, |
| 697 | struct se_node_acl *nacl, |
| 698 | unsigned char *md_buf, |
| 699 | int new_state, |
| 700 | int explict) |
| 701 | { |
| 702 | struct se_dev_entry *se_deve; |
| 703 | struct se_lun_acl *lacl; |
| 704 | struct se_port *port; |
| 705 | struct t10_alua_tg_pt_gp_member *mem; |
| 706 | int old_state = 0; |
| 707 | /* |
| 708 | * Save the old primary ALUA access state, and set the current state |
| 709 | * to ALUA_ACCESS_STATE_TRANSITION. |
| 710 | */ |
| 711 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); |
| 712 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| 713 | ALUA_ACCESS_STATE_TRANSITION); |
| 714 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? |
| 715 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| 716 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| 717 | /* |
| 718 | * Check for the optional ALUA primary state transition delay |
| 719 | */ |
| 720 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) |
| 721 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| 722 | |
| 723 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 724 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, |
| 725 | tg_pt_gp_mem_list) { |
| 726 | port = mem->tg_pt; |
| 727 | /* |
| 728 | * After an implicit target port asymmetric access state |
| 729 | * change, a device server shall establish a unit attention |
| 730 | * condition for the initiator port associated with every I_T |
| 731 | * nexus with the additional sense code set to ASYMMETRIC |
| 732 | * ACCESS STATE CHAGED. |
| 733 | * |
| 734 | * After an explicit target port asymmetric access state |
| 735 | * change, a device server shall establish a unit attention |
| 736 | * condition with the additional sense code set to ASYMMETRIC |
| 737 | * ACCESS STATE CHANGED for the initiator port associated with |
| 738 | * every I_T nexus other than the I_T nexus on which the SET |
| 739 | * TARGET PORT GROUPS command |
| 740 | */ |
| 741 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); |
| 742 | smp_mb__after_atomic_inc(); |
| 743 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 744 | |
| 745 | spin_lock_bh(&port->sep_alua_lock); |
| 746 | list_for_each_entry(se_deve, &port->sep_alua_list, |
| 747 | alua_port_list) { |
| 748 | lacl = se_deve->se_lun_acl; |
| 749 | /* |
| 750 | * se_deve->se_lun_acl pointer may be NULL for a |
| 751 | * entry created without explict Node+MappedLUN ACLs |
| 752 | */ |
| 753 | if (!(lacl)) |
| 754 | continue; |
| 755 | |
| 756 | if (explict && |
| 757 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && |
| 758 | (l_port != NULL) && (l_port == port)) |
| 759 | continue; |
| 760 | |
| 761 | core_scsi3_ua_allocate(lacl->se_lun_nacl, |
| 762 | se_deve->mapped_lun, 0x2A, |
| 763 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); |
| 764 | } |
| 765 | spin_unlock_bh(&port->sep_alua_lock); |
| 766 | |
| 767 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 768 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); |
| 769 | smp_mb__after_atomic_dec(); |
| 770 | } |
| 771 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 772 | /* |
| 773 | * Update the ALUA metadata buf that has been allocated in |
| 774 | * core_alua_do_port_transition(), this metadata will be written |
| 775 | * to struct file. |
| 776 | * |
| 777 | * Note that there is the case where we do not want to update the |
| 778 | * metadata when the saved metadata is being parsed in userspace |
| 779 | * when setting the existing port access state and access status. |
| 780 | * |
| 781 | * Also note that the failure to write out the ALUA metadata to |
| 782 | * struct file does NOT affect the actual ALUA transition. |
| 783 | */ |
| 784 | if (tg_pt_gp->tg_pt_gp_write_metadata) { |
| 785 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 786 | core_alua_update_tpg_primary_metadata(tg_pt_gp, |
| 787 | new_state, md_buf); |
| 788 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 789 | } |
| 790 | /* |
| 791 | * Set the current primary ALUA access state to the requested new state |
| 792 | */ |
| 793 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); |
| 794 | |
| 795 | printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu" |
| 796 | " from primary access state %s to %s\n", (explict) ? "explict" : |
| 797 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| 798 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), |
| 799 | core_alua_dump_state(new_state)); |
| 800 | |
| 801 | return 0; |
| 802 | } |
| 803 | |
| 804 | int core_alua_do_port_transition( |
| 805 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, |
| 806 | struct se_device *l_dev, |
| 807 | struct se_port *l_port, |
| 808 | struct se_node_acl *l_nacl, |
| 809 | int new_state, |
| 810 | int explict) |
| 811 | { |
| 812 | struct se_device *dev; |
| 813 | struct se_port *port; |
| 814 | struct se_subsystem_dev *su_dev; |
| 815 | struct se_node_acl *nacl; |
| 816 | struct t10_alua_lu_gp *lu_gp; |
| 817 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; |
| 818 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 819 | unsigned char *md_buf; |
| 820 | int primary; |
| 821 | |
| 822 | if (core_alua_check_transition(new_state, &primary) != 0) |
| 823 | return -EINVAL; |
| 824 | |
| 825 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); |
| 826 | if (!(md_buf)) { |
| 827 | printk("Unable to allocate buf for ALUA metadata\n"); |
| 828 | return -ENOMEM; |
| 829 | } |
| 830 | |
| 831 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; |
| 832 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); |
| 833 | lu_gp = local_lu_gp_mem->lu_gp; |
| 834 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
| 835 | smp_mb__after_atomic_inc(); |
| 836 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); |
| 837 | /* |
| 838 | * For storage objects that are members of the 'default_lu_gp', |
| 839 | * we only do transition on the passed *l_tp_pt_gp, and not |
| 840 | * on all of the matching target port groups IDs in default_lu_gp. |
| 841 | */ |
| 842 | if (!(lu_gp->lu_gp_id)) { |
| 843 | /* |
| 844 | * core_alua_do_transition_tg_pt() will always return |
| 845 | * success. |
| 846 | */ |
| 847 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, |
| 848 | md_buf, new_state, explict); |
| 849 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 850 | smp_mb__after_atomic_dec(); |
| 851 | kfree(md_buf); |
| 852 | return 0; |
| 853 | } |
| 854 | /* |
| 855 | * For all other LU groups aside from 'default_lu_gp', walk all of |
| 856 | * the associated storage objects looking for a matching target port |
| 857 | * group ID from the local target port group. |
| 858 | */ |
| 859 | spin_lock(&lu_gp->lu_gp_lock); |
| 860 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, |
| 861 | lu_gp_mem_list) { |
| 862 | |
| 863 | dev = lu_gp_mem->lu_gp_mem_dev; |
| 864 | su_dev = dev->se_sub_dev; |
| 865 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| 866 | smp_mb__after_atomic_inc(); |
| 867 | spin_unlock(&lu_gp->lu_gp_lock); |
| 868 | |
| 869 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 870 | list_for_each_entry(tg_pt_gp, |
| 871 | &T10_ALUA(su_dev)->tg_pt_gps_list, |
| 872 | tg_pt_gp_list) { |
| 873 | |
| 874 | if (!(tg_pt_gp->tg_pt_gp_valid_id)) |
| 875 | continue; |
| 876 | /* |
| 877 | * If the target behavior port asymmetric access state |
| 878 | * is changed for any target port group accessiable via |
| 879 | * a logical unit within a LU group, the target port |
| 880 | * behavior group asymmetric access states for the same |
| 881 | * target port group accessible via other logical units |
| 882 | * in that LU group will also change. |
| 883 | */ |
| 884 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) |
| 885 | continue; |
| 886 | |
| 887 | if (l_tg_pt_gp == tg_pt_gp) { |
| 888 | port = l_port; |
| 889 | nacl = l_nacl; |
| 890 | } else { |
| 891 | port = NULL; |
| 892 | nacl = NULL; |
| 893 | } |
| 894 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 895 | smp_mb__after_atomic_inc(); |
| 896 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 897 | /* |
| 898 | * core_alua_do_transition_tg_pt() will always return |
| 899 | * success. |
| 900 | */ |
| 901 | core_alua_do_transition_tg_pt(tg_pt_gp, port, |
| 902 | nacl, md_buf, new_state, explict); |
| 903 | |
| 904 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 905 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 906 | smp_mb__after_atomic_dec(); |
| 907 | } |
| 908 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 909 | |
| 910 | spin_lock(&lu_gp->lu_gp_lock); |
| 911 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); |
| 912 | smp_mb__after_atomic_dec(); |
| 913 | } |
| 914 | spin_unlock(&lu_gp->lu_gp_lock); |
| 915 | |
| 916 | printk(KERN_INFO "Successfully processed LU Group: %s all ALUA TG PT" |
| 917 | " Group IDs: %hu %s transition to primary state: %s\n", |
| 918 | config_item_name(&lu_gp->lu_gp_group.cg_item), |
| 919 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", |
| 920 | core_alua_dump_state(new_state)); |
| 921 | |
| 922 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 923 | smp_mb__after_atomic_dec(); |
| 924 | kfree(md_buf); |
| 925 | return 0; |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held |
| 930 | */ |
| 931 | static int core_alua_update_tpg_secondary_metadata( |
| 932 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 933 | struct se_port *port, |
| 934 | unsigned char *md_buf, |
| 935 | u32 md_buf_len) |
| 936 | { |
| 937 | struct se_portal_group *se_tpg = port->sep_tpg; |
| 938 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; |
| 939 | int len; |
| 940 | |
| 941 | memset(path, 0, ALUA_METADATA_PATH_LEN); |
| 942 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); |
| 943 | |
| 944 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", |
| 945 | TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg)); |
| 946 | |
| 947 | if (TPG_TFO(se_tpg)->tpg_get_tag != NULL) |
| 948 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
| 949 | TPG_TFO(se_tpg)->tpg_get_tag(se_tpg)); |
| 950 | |
| 951 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" |
| 952 | "alua_tg_pt_status=0x%02x\n", |
| 953 | atomic_read(&port->sep_tg_pt_secondary_offline), |
| 954 | port->sep_tg_pt_secondary_stat); |
| 955 | |
| 956 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", |
| 957 | TPG_TFO(se_tpg)->get_fabric_name(), wwn, |
| 958 | port->sep_lun->unpacked_lun); |
| 959 | |
| 960 | return core_alua_write_tpg_metadata(path, md_buf, len); |
| 961 | } |
| 962 | |
| 963 | static int core_alua_set_tg_pt_secondary_state( |
| 964 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 965 | struct se_port *port, |
| 966 | int explict, |
| 967 | int offline) |
| 968 | { |
| 969 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 970 | unsigned char *md_buf; |
| 971 | u32 md_buf_len; |
| 972 | int trans_delay_msecs; |
| 973 | |
| 974 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 975 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 976 | if (!(tg_pt_gp)) { |
| 977 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 978 | printk(KERN_ERR "Unable to complete secondary state" |
| 979 | " transition\n"); |
| 980 | return -1; |
| 981 | } |
| 982 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; |
| 983 | /* |
| 984 | * Set the secondary ALUA target port access state to OFFLINE |
| 985 | * or release the previously secondary state for struct se_port |
| 986 | */ |
| 987 | if (offline) |
| 988 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); |
| 989 | else |
| 990 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); |
| 991 | |
| 992 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; |
| 993 | port->sep_tg_pt_secondary_stat = (explict) ? |
| 994 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : |
| 995 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; |
| 996 | |
| 997 | printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu" |
| 998 | " to secondary access state: %s\n", (explict) ? "explict" : |
| 999 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), |
| 1000 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); |
| 1001 | |
| 1002 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1003 | /* |
| 1004 | * Do the optional transition delay after we set the secondary |
| 1005 | * ALUA access state. |
| 1006 | */ |
| 1007 | if (trans_delay_msecs != 0) |
| 1008 | msleep_interruptible(trans_delay_msecs); |
| 1009 | /* |
| 1010 | * See if we need to update the ALUA fabric port metadata for |
| 1011 | * secondary state and status |
| 1012 | */ |
| 1013 | if (port->sep_tg_pt_secondary_write_md) { |
| 1014 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); |
| 1015 | if (!(md_buf)) { |
| 1016 | printk(KERN_ERR "Unable to allocate md_buf for" |
| 1017 | " secondary ALUA access metadata\n"); |
| 1018 | return -1; |
| 1019 | } |
| 1020 | mutex_lock(&port->sep_tg_pt_md_mutex); |
| 1021 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, |
| 1022 | md_buf, md_buf_len); |
| 1023 | mutex_unlock(&port->sep_tg_pt_md_mutex); |
| 1024 | |
| 1025 | kfree(md_buf); |
| 1026 | } |
| 1027 | |
| 1028 | return 0; |
| 1029 | } |
| 1030 | |
| 1031 | struct t10_alua_lu_gp * |
| 1032 | core_alua_allocate_lu_gp(const char *name, int def_group) |
| 1033 | { |
| 1034 | struct t10_alua_lu_gp *lu_gp; |
| 1035 | |
| 1036 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); |
| 1037 | if (!(lu_gp)) { |
| 1038 | printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp\n"); |
Justin P. Mattock | 6eab04a | 2011-04-08 19:49:08 -0700 | [diff] [blame] | 1039 | return ERR_PTR(-ENOMEM); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1040 | } |
| 1041 | INIT_LIST_HEAD(&lu_gp->lu_gp_list); |
| 1042 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
| 1043 | spin_lock_init(&lu_gp->lu_gp_lock); |
| 1044 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); |
| 1045 | |
| 1046 | if (def_group) { |
Justin P. Mattock | 6eab04a | 2011-04-08 19:49:08 -0700 | [diff] [blame] | 1047 | lu_gp->lu_gp_id = se_global->alua_lu_gps_counter++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1048 | lu_gp->lu_gp_valid_id = 1; |
| 1049 | se_global->alua_lu_gps_count++; |
| 1050 | } |
| 1051 | |
| 1052 | return lu_gp; |
| 1053 | } |
| 1054 | |
| 1055 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) |
| 1056 | { |
| 1057 | struct t10_alua_lu_gp *lu_gp_tmp; |
| 1058 | u16 lu_gp_id_tmp; |
| 1059 | /* |
| 1060 | * The lu_gp->lu_gp_id may only be set once.. |
| 1061 | */ |
| 1062 | if (lu_gp->lu_gp_valid_id) { |
| 1063 | printk(KERN_WARNING "ALUA LU Group already has a valid ID," |
| 1064 | " ignoring request\n"); |
| 1065 | return -1; |
| 1066 | } |
| 1067 | |
| 1068 | spin_lock(&se_global->lu_gps_lock); |
| 1069 | if (se_global->alua_lu_gps_count == 0x0000ffff) { |
| 1070 | printk(KERN_ERR "Maximum ALUA se_global->alua_lu_gps_count:" |
| 1071 | " 0x0000ffff reached\n"); |
| 1072 | spin_unlock(&se_global->lu_gps_lock); |
| 1073 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
| 1074 | return -1; |
| 1075 | } |
| 1076 | again: |
| 1077 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : |
| 1078 | se_global->alua_lu_gps_counter++; |
| 1079 | |
| 1080 | list_for_each_entry(lu_gp_tmp, &se_global->g_lu_gps_list, lu_gp_list) { |
| 1081 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
| 1082 | if (!(lu_gp_id)) |
| 1083 | goto again; |
| 1084 | |
| 1085 | printk(KERN_WARNING "ALUA Logical Unit Group ID: %hu" |
| 1086 | " already exists, ignoring request\n", |
| 1087 | lu_gp_id); |
| 1088 | spin_unlock(&se_global->lu_gps_lock); |
| 1089 | return -1; |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | lu_gp->lu_gp_id = lu_gp_id_tmp; |
| 1094 | lu_gp->lu_gp_valid_id = 1; |
| 1095 | list_add_tail(&lu_gp->lu_gp_list, &se_global->g_lu_gps_list); |
| 1096 | se_global->alua_lu_gps_count++; |
| 1097 | spin_unlock(&se_global->lu_gps_lock); |
| 1098 | |
| 1099 | return 0; |
| 1100 | } |
| 1101 | |
| 1102 | static struct t10_alua_lu_gp_member * |
| 1103 | core_alua_allocate_lu_gp_mem(struct se_device *dev) |
| 1104 | { |
| 1105 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1106 | |
| 1107 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); |
| 1108 | if (!(lu_gp_mem)) { |
| 1109 | printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp_member\n"); |
| 1110 | return ERR_PTR(-ENOMEM); |
| 1111 | } |
| 1112 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); |
| 1113 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); |
| 1114 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); |
| 1115 | |
| 1116 | lu_gp_mem->lu_gp_mem_dev = dev; |
| 1117 | dev->dev_alua_lu_gp_mem = lu_gp_mem; |
| 1118 | |
| 1119 | return lu_gp_mem; |
| 1120 | } |
| 1121 | |
| 1122 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) |
| 1123 | { |
| 1124 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; |
| 1125 | /* |
| 1126 | * Once we have reached this point, config_item_put() has |
| 1127 | * already been called from target_core_alua_drop_lu_gp(). |
| 1128 | * |
| 1129 | * Here, we remove the *lu_gp from the global list so that |
| 1130 | * no associations can be made while we are releasing |
| 1131 | * struct t10_alua_lu_gp. |
| 1132 | */ |
| 1133 | spin_lock(&se_global->lu_gps_lock); |
| 1134 | atomic_set(&lu_gp->lu_gp_shutdown, 1); |
| 1135 | list_del(&lu_gp->lu_gp_list); |
| 1136 | se_global->alua_lu_gps_count--; |
| 1137 | spin_unlock(&se_global->lu_gps_lock); |
| 1138 | /* |
| 1139 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() |
| 1140 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be |
| 1141 | * released with core_alua_put_lu_gp_from_name() |
| 1142 | */ |
| 1143 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) |
| 1144 | cpu_relax(); |
| 1145 | /* |
| 1146 | * Release reference to struct t10_alua_lu_gp * from all associated |
| 1147 | * struct se_device. |
| 1148 | */ |
| 1149 | spin_lock(&lu_gp->lu_gp_lock); |
| 1150 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, |
| 1151 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { |
| 1152 | if (lu_gp_mem->lu_gp_assoc) { |
| 1153 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1154 | lu_gp->lu_gp_members--; |
| 1155 | lu_gp_mem->lu_gp_assoc = 0; |
| 1156 | } |
| 1157 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1158 | /* |
| 1159 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1160 | * lu_gp_mem is associated with a single |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1161 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
| 1162 | * struct se_device is released via core_alua_free_lu_gp_mem(). |
| 1163 | * |
| 1164 | * If the passed lu_gp does NOT match the default_lu_gp, assume |
| 1165 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. |
| 1166 | */ |
| 1167 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 1168 | if (lu_gp != se_global->default_lu_gp) |
| 1169 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
| 1170 | se_global->default_lu_gp); |
| 1171 | else |
| 1172 | lu_gp_mem->lu_gp = NULL; |
| 1173 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1174 | |
| 1175 | spin_lock(&lu_gp->lu_gp_lock); |
| 1176 | } |
| 1177 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1178 | |
| 1179 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
| 1180 | } |
| 1181 | |
| 1182 | void core_alua_free_lu_gp_mem(struct se_device *dev) |
| 1183 | { |
| 1184 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| 1185 | struct t10_alua *alua = T10_ALUA(su_dev); |
| 1186 | struct t10_alua_lu_gp *lu_gp; |
| 1187 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1188 | |
| 1189 | if (alua->alua_type != SPC3_ALUA_EMULATED) |
| 1190 | return; |
| 1191 | |
| 1192 | lu_gp_mem = dev->dev_alua_lu_gp_mem; |
| 1193 | if (!(lu_gp_mem)) |
| 1194 | return; |
| 1195 | |
| 1196 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) |
| 1197 | cpu_relax(); |
| 1198 | |
| 1199 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 1200 | lu_gp = lu_gp_mem->lu_gp; |
| 1201 | if ((lu_gp)) { |
| 1202 | spin_lock(&lu_gp->lu_gp_lock); |
| 1203 | if (lu_gp_mem->lu_gp_assoc) { |
| 1204 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1205 | lu_gp->lu_gp_members--; |
| 1206 | lu_gp_mem->lu_gp_assoc = 0; |
| 1207 | } |
| 1208 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1209 | lu_gp_mem->lu_gp = NULL; |
| 1210 | } |
| 1211 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1212 | |
| 1213 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); |
| 1214 | } |
| 1215 | |
| 1216 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) |
| 1217 | { |
| 1218 | struct t10_alua_lu_gp *lu_gp; |
| 1219 | struct config_item *ci; |
| 1220 | |
| 1221 | spin_lock(&se_global->lu_gps_lock); |
| 1222 | list_for_each_entry(lu_gp, &se_global->g_lu_gps_list, lu_gp_list) { |
| 1223 | if (!(lu_gp->lu_gp_valid_id)) |
| 1224 | continue; |
| 1225 | ci = &lu_gp->lu_gp_group.cg_item; |
| 1226 | if (!(strcmp(config_item_name(ci), name))) { |
| 1227 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
| 1228 | spin_unlock(&se_global->lu_gps_lock); |
| 1229 | return lu_gp; |
| 1230 | } |
| 1231 | } |
| 1232 | spin_unlock(&se_global->lu_gps_lock); |
| 1233 | |
| 1234 | return NULL; |
| 1235 | } |
| 1236 | |
| 1237 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) |
| 1238 | { |
| 1239 | spin_lock(&se_global->lu_gps_lock); |
| 1240 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
| 1241 | spin_unlock(&se_global->lu_gps_lock); |
| 1242 | } |
| 1243 | |
| 1244 | /* |
| 1245 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| 1246 | */ |
| 1247 | void __core_alua_attach_lu_gp_mem( |
| 1248 | struct t10_alua_lu_gp_member *lu_gp_mem, |
| 1249 | struct t10_alua_lu_gp *lu_gp) |
| 1250 | { |
| 1251 | spin_lock(&lu_gp->lu_gp_lock); |
| 1252 | lu_gp_mem->lu_gp = lu_gp; |
| 1253 | lu_gp_mem->lu_gp_assoc = 1; |
| 1254 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); |
| 1255 | lu_gp->lu_gp_members++; |
| 1256 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock |
| 1261 | */ |
| 1262 | void __core_alua_drop_lu_gp_mem( |
| 1263 | struct t10_alua_lu_gp_member *lu_gp_mem, |
| 1264 | struct t10_alua_lu_gp *lu_gp) |
| 1265 | { |
| 1266 | spin_lock(&lu_gp->lu_gp_lock); |
| 1267 | list_del(&lu_gp_mem->lu_gp_mem_list); |
| 1268 | lu_gp_mem->lu_gp = NULL; |
| 1269 | lu_gp_mem->lu_gp_assoc = 0; |
| 1270 | lu_gp->lu_gp_members--; |
| 1271 | spin_unlock(&lu_gp->lu_gp_lock); |
| 1272 | } |
| 1273 | |
| 1274 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( |
| 1275 | struct se_subsystem_dev *su_dev, |
| 1276 | const char *name, |
| 1277 | int def_group) |
| 1278 | { |
| 1279 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1280 | |
| 1281 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); |
| 1282 | if (!(tg_pt_gp)) { |
| 1283 | printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp\n"); |
| 1284 | return NULL; |
| 1285 | } |
| 1286 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); |
| 1287 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); |
| 1288 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); |
| 1289 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); |
| 1290 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); |
| 1291 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; |
| 1292 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
| 1293 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, |
| 1294 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); |
| 1295 | /* |
| 1296 | * Enable both explict and implict ALUA support by default |
| 1297 | */ |
| 1298 | tg_pt_gp->tg_pt_gp_alua_access_type = |
| 1299 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; |
| 1300 | /* |
| 1301 | * Set the default Active/NonOptimized Delay in milliseconds |
| 1302 | */ |
| 1303 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; |
| 1304 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; |
| 1305 | |
| 1306 | if (def_group) { |
| 1307 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1308 | tg_pt_gp->tg_pt_gp_id = |
| 1309 | T10_ALUA(su_dev)->alua_tg_pt_gps_counter++; |
| 1310 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
| 1311 | T10_ALUA(su_dev)->alua_tg_pt_gps_count++; |
| 1312 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
| 1313 | &T10_ALUA(su_dev)->tg_pt_gps_list); |
| 1314 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1315 | } |
| 1316 | |
| 1317 | return tg_pt_gp; |
| 1318 | } |
| 1319 | |
| 1320 | int core_alua_set_tg_pt_gp_id( |
| 1321 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1322 | u16 tg_pt_gp_id) |
| 1323 | { |
| 1324 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 1325 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
| 1326 | u16 tg_pt_gp_id_tmp; |
| 1327 | /* |
| 1328 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. |
| 1329 | */ |
| 1330 | if (tg_pt_gp->tg_pt_gp_valid_id) { |
| 1331 | printk(KERN_WARNING "ALUA TG PT Group already has a valid ID," |
| 1332 | " ignoring request\n"); |
| 1333 | return -1; |
| 1334 | } |
| 1335 | |
| 1336 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1337 | if (T10_ALUA(su_dev)->alua_tg_pt_gps_count == 0x0000ffff) { |
| 1338 | printk(KERN_ERR "Maximum ALUA alua_tg_pt_gps_count:" |
| 1339 | " 0x0000ffff reached\n"); |
| 1340 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1341 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
| 1342 | return -1; |
| 1343 | } |
| 1344 | again: |
| 1345 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : |
| 1346 | T10_ALUA(su_dev)->alua_tg_pt_gps_counter++; |
| 1347 | |
| 1348 | list_for_each_entry(tg_pt_gp_tmp, &T10_ALUA(su_dev)->tg_pt_gps_list, |
| 1349 | tg_pt_gp_list) { |
| 1350 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { |
| 1351 | if (!(tg_pt_gp_id)) |
| 1352 | goto again; |
| 1353 | |
| 1354 | printk(KERN_ERR "ALUA Target Port Group ID: %hu already" |
| 1355 | " exists, ignoring request\n", tg_pt_gp_id); |
| 1356 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1357 | return -1; |
| 1358 | } |
| 1359 | } |
| 1360 | |
| 1361 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; |
| 1362 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
| 1363 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
| 1364 | &T10_ALUA(su_dev)->tg_pt_gps_list); |
| 1365 | T10_ALUA(su_dev)->alua_tg_pt_gps_count++; |
| 1366 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1367 | |
| 1368 | return 0; |
| 1369 | } |
| 1370 | |
| 1371 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( |
| 1372 | struct se_port *port) |
| 1373 | { |
| 1374 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1375 | |
| 1376 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, |
| 1377 | GFP_KERNEL); |
| 1378 | if (!(tg_pt_gp_mem)) { |
| 1379 | printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp_member\n"); |
| 1380 | return ERR_PTR(-ENOMEM); |
| 1381 | } |
| 1382 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1383 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1384 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); |
| 1385 | |
| 1386 | tg_pt_gp_mem->tg_pt = port; |
| 1387 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; |
| 1388 | atomic_set(&port->sep_tg_pt_gp_active, 1); |
| 1389 | |
| 1390 | return tg_pt_gp_mem; |
| 1391 | } |
| 1392 | |
| 1393 | void core_alua_free_tg_pt_gp( |
| 1394 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1395 | { |
| 1396 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 1397 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
| 1398 | /* |
| 1399 | * Once we have reached this point, config_item_put() has already |
| 1400 | * been called from target_core_alua_drop_tg_pt_gp(). |
| 1401 | * |
| 1402 | * Here we remove *tg_pt_gp from the global list so that |
| 1403 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS |
| 1404 | * can be made while we are releasing struct t10_alua_tg_pt_gp. |
| 1405 | */ |
| 1406 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1407 | list_del(&tg_pt_gp->tg_pt_gp_list); |
| 1408 | T10_ALUA(su_dev)->alua_tg_pt_gps_counter--; |
| 1409 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1410 | /* |
| 1411 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by |
| 1412 | * core_alua_get_tg_pt_gp_by_name() in |
| 1413 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() |
| 1414 | * to be released with core_alua_put_tg_pt_gp_from_name(). |
| 1415 | */ |
| 1416 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) |
| 1417 | cpu_relax(); |
| 1418 | /* |
| 1419 | * Release reference to struct t10_alua_tg_pt_gp from all associated |
| 1420 | * struct se_port. |
| 1421 | */ |
| 1422 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1423 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, |
| 1424 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { |
| 1425 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| 1426 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1427 | tg_pt_gp->tg_pt_gp_members--; |
| 1428 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1429 | } |
| 1430 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1431 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1432 | * tg_pt_gp_mem is associated with a single |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1433 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
| 1434 | * core_alua_free_tg_pt_gp_mem(). |
| 1435 | * |
| 1436 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, |
| 1437 | * assume we want to re-assocate a given tg_pt_gp_mem with |
| 1438 | * default_tg_pt_gp. |
| 1439 | */ |
| 1440 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1441 | if (tg_pt_gp != T10_ALUA(su_dev)->default_tg_pt_gp) { |
| 1442 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
| 1443 | T10_ALUA(su_dev)->default_tg_pt_gp); |
| 1444 | } else |
| 1445 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1446 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1447 | |
| 1448 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1449 | } |
| 1450 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1451 | |
| 1452 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
| 1453 | } |
| 1454 | |
| 1455 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) |
| 1456 | { |
| 1457 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| 1458 | struct t10_alua *alua = T10_ALUA(su_dev); |
| 1459 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1460 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1461 | |
| 1462 | if (alua->alua_type != SPC3_ALUA_EMULATED) |
| 1463 | return; |
| 1464 | |
| 1465 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 1466 | if (!(tg_pt_gp_mem)) |
| 1467 | return; |
| 1468 | |
| 1469 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) |
| 1470 | cpu_relax(); |
| 1471 | |
| 1472 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1473 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 1474 | if ((tg_pt_gp)) { |
| 1475 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1476 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { |
| 1477 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1478 | tg_pt_gp->tg_pt_gp_members--; |
| 1479 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1480 | } |
| 1481 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1482 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1483 | } |
| 1484 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1485 | |
| 1486 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); |
| 1487 | } |
| 1488 | |
| 1489 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( |
| 1490 | struct se_subsystem_dev *su_dev, |
| 1491 | const char *name) |
| 1492 | { |
| 1493 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1494 | struct config_item *ci; |
| 1495 | |
| 1496 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1497 | list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->tg_pt_gps_list, |
| 1498 | tg_pt_gp_list) { |
| 1499 | if (!(tg_pt_gp->tg_pt_gp_valid_id)) |
| 1500 | continue; |
| 1501 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
| 1502 | if (!(strcmp(config_item_name(ci), name))) { |
| 1503 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 1504 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1505 | return tg_pt_gp; |
| 1506 | } |
| 1507 | } |
| 1508 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1509 | |
| 1510 | return NULL; |
| 1511 | } |
| 1512 | |
| 1513 | static void core_alua_put_tg_pt_gp_from_name( |
| 1514 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1515 | { |
| 1516 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; |
| 1517 | |
| 1518 | spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1519 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
| 1520 | spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock); |
| 1521 | } |
| 1522 | |
| 1523 | /* |
| 1524 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| 1525 | */ |
| 1526 | void __core_alua_attach_tg_pt_gp_mem( |
| 1527 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1528 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1529 | { |
| 1530 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1531 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; |
| 1532 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; |
| 1533 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, |
| 1534 | &tg_pt_gp->tg_pt_gp_mem_list); |
| 1535 | tg_pt_gp->tg_pt_gp_members++; |
| 1536 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1537 | } |
| 1538 | |
| 1539 | /* |
| 1540 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held |
| 1541 | */ |
| 1542 | static void __core_alua_drop_tg_pt_gp_mem( |
| 1543 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, |
| 1544 | struct t10_alua_tg_pt_gp *tg_pt_gp) |
| 1545 | { |
| 1546 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
| 1547 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); |
| 1548 | tg_pt_gp_mem->tg_pt_gp = NULL; |
| 1549 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; |
| 1550 | tg_pt_gp->tg_pt_gp_members--; |
| 1551 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); |
| 1552 | } |
| 1553 | |
| 1554 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) |
| 1555 | { |
| 1556 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| 1557 | struct config_item *tg_pt_ci; |
| 1558 | struct t10_alua *alua = T10_ALUA(su_dev); |
| 1559 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
| 1560 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1561 | ssize_t len = 0; |
| 1562 | |
| 1563 | if (alua->alua_type != SPC3_ALUA_EMULATED) |
| 1564 | return len; |
| 1565 | |
| 1566 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 1567 | if (!(tg_pt_gp_mem)) |
| 1568 | return len; |
| 1569 | |
| 1570 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1571 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 1572 | if ((tg_pt_gp)) { |
| 1573 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
| 1574 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" |
| 1575 | " %hu\nTG Port Primary Access State: %s\nTG Port " |
| 1576 | "Primary Access Status: %s\nTG Port Secondary Access" |
| 1577 | " State: %s\nTG Port Secondary Access Status: %s\n", |
| 1578 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, |
| 1579 | core_alua_dump_state(atomic_read( |
| 1580 | &tg_pt_gp->tg_pt_gp_alua_access_state)), |
| 1581 | core_alua_dump_status( |
| 1582 | tg_pt_gp->tg_pt_gp_alua_access_status), |
| 1583 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? |
| 1584 | "Offline" : "None", |
| 1585 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); |
| 1586 | } |
| 1587 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1588 | |
| 1589 | return len; |
| 1590 | } |
| 1591 | |
| 1592 | ssize_t core_alua_store_tg_pt_gp_info( |
| 1593 | struct se_port *port, |
| 1594 | const char *page, |
| 1595 | size_t count) |
| 1596 | { |
| 1597 | struct se_portal_group *tpg; |
| 1598 | struct se_lun *lun; |
| 1599 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; |
| 1600 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
| 1601 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1602 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; |
| 1603 | int move = 0; |
| 1604 | |
| 1605 | tpg = port->sep_tpg; |
| 1606 | lun = port->sep_lun; |
| 1607 | |
| 1608 | if (T10_ALUA(su_dev)->alua_type != SPC3_ALUA_EMULATED) { |
| 1609 | printk(KERN_WARNING "SPC3_ALUA_EMULATED not enabled for" |
| 1610 | " %s/tpgt_%hu/%s\n", TPG_TFO(tpg)->tpg_get_wwn(tpg), |
| 1611 | TPG_TFO(tpg)->tpg_get_tag(tpg), |
| 1612 | config_item_name(&lun->lun_group.cg_item)); |
| 1613 | return -EINVAL; |
| 1614 | } |
| 1615 | |
| 1616 | if (count > TG_PT_GROUP_NAME_BUF) { |
| 1617 | printk(KERN_ERR "ALUA Target Port Group alias too large!\n"); |
| 1618 | return -EINVAL; |
| 1619 | } |
| 1620 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); |
| 1621 | memcpy(buf, page, count); |
| 1622 | /* |
| 1623 | * Any ALUA target port group alias besides "NULL" means we will be |
| 1624 | * making a new group association. |
| 1625 | */ |
| 1626 | if (strcmp(strstrip(buf), "NULL")) { |
| 1627 | /* |
| 1628 | * core_alua_get_tg_pt_gp_by_name() will increment reference to |
| 1629 | * struct t10_alua_tg_pt_gp. This reference is released with |
| 1630 | * core_alua_put_tg_pt_gp_from_name() below. |
| 1631 | */ |
| 1632 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, |
| 1633 | strstrip(buf)); |
| 1634 | if (!(tg_pt_gp_new)) |
| 1635 | return -ENODEV; |
| 1636 | } |
| 1637 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
| 1638 | if (!(tg_pt_gp_mem)) { |
| 1639 | if (tg_pt_gp_new) |
| 1640 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
| 1641 | printk(KERN_ERR "NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
| 1642 | return -EINVAL; |
| 1643 | } |
| 1644 | |
| 1645 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1646 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; |
| 1647 | if ((tg_pt_gp)) { |
| 1648 | /* |
| 1649 | * Clearing an existing tg_pt_gp association, and replacing |
| 1650 | * with the default_tg_pt_gp. |
| 1651 | */ |
| 1652 | if (!(tg_pt_gp_new)) { |
| 1653 | printk(KERN_INFO "Target_Core_ConfigFS: Moving" |
| 1654 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
| 1655 | " alua/%s, ID: %hu back to" |
| 1656 | " default_tg_pt_gp\n", |
| 1657 | TPG_TFO(tpg)->tpg_get_wwn(tpg), |
| 1658 | TPG_TFO(tpg)->tpg_get_tag(tpg), |
| 1659 | config_item_name(&lun->lun_group.cg_item), |
| 1660 | config_item_name( |
| 1661 | &tg_pt_gp->tg_pt_gp_group.cg_item), |
| 1662 | tg_pt_gp->tg_pt_gp_id); |
| 1663 | |
| 1664 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); |
| 1665 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
| 1666 | T10_ALUA(su_dev)->default_tg_pt_gp); |
| 1667 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1668 | |
| 1669 | return count; |
| 1670 | } |
| 1671 | /* |
| 1672 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp |
| 1673 | */ |
| 1674 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); |
| 1675 | move = 1; |
| 1676 | } |
| 1677 | /* |
| 1678 | * Associate tg_pt_gp_mem with tg_pt_gp_new. |
| 1679 | */ |
| 1680 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); |
| 1681 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
| 1682 | printk(KERN_INFO "Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
| 1683 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
| 1684 | "Moving" : "Adding", TPG_TFO(tpg)->tpg_get_wwn(tpg), |
| 1685 | TPG_TFO(tpg)->tpg_get_tag(tpg), |
| 1686 | config_item_name(&lun->lun_group.cg_item), |
| 1687 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), |
| 1688 | tg_pt_gp_new->tg_pt_gp_id); |
| 1689 | |
| 1690 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); |
| 1691 | return count; |
| 1692 | } |
| 1693 | |
| 1694 | ssize_t core_alua_show_access_type( |
| 1695 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1696 | char *page) |
| 1697 | { |
| 1698 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && |
| 1699 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) |
| 1700 | return sprintf(page, "Implict and Explict\n"); |
| 1701 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) |
| 1702 | return sprintf(page, "Implict\n"); |
| 1703 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) |
| 1704 | return sprintf(page, "Explict\n"); |
| 1705 | else |
| 1706 | return sprintf(page, "None\n"); |
| 1707 | } |
| 1708 | |
| 1709 | ssize_t core_alua_store_access_type( |
| 1710 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1711 | const char *page, |
| 1712 | size_t count) |
| 1713 | { |
| 1714 | unsigned long tmp; |
| 1715 | int ret; |
| 1716 | |
| 1717 | ret = strict_strtoul(page, 0, &tmp); |
| 1718 | if (ret < 0) { |
| 1719 | printk(KERN_ERR "Unable to extract alua_access_type\n"); |
| 1720 | return -EINVAL; |
| 1721 | } |
| 1722 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { |
| 1723 | printk(KERN_ERR "Illegal value for alua_access_type:" |
| 1724 | " %lu\n", tmp); |
| 1725 | return -EINVAL; |
| 1726 | } |
| 1727 | if (tmp == 3) |
| 1728 | tg_pt_gp->tg_pt_gp_alua_access_type = |
| 1729 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; |
| 1730 | else if (tmp == 2) |
| 1731 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; |
| 1732 | else if (tmp == 1) |
| 1733 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; |
| 1734 | else |
| 1735 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; |
| 1736 | |
| 1737 | return count; |
| 1738 | } |
| 1739 | |
| 1740 | ssize_t core_alua_show_nonop_delay_msecs( |
| 1741 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1742 | char *page) |
| 1743 | { |
| 1744 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); |
| 1745 | } |
| 1746 | |
| 1747 | ssize_t core_alua_store_nonop_delay_msecs( |
| 1748 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1749 | const char *page, |
| 1750 | size_t count) |
| 1751 | { |
| 1752 | unsigned long tmp; |
| 1753 | int ret; |
| 1754 | |
| 1755 | ret = strict_strtoul(page, 0, &tmp); |
| 1756 | if (ret < 0) { |
| 1757 | printk(KERN_ERR "Unable to extract nonop_delay_msecs\n"); |
| 1758 | return -EINVAL; |
| 1759 | } |
| 1760 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { |
| 1761 | printk(KERN_ERR "Passed nonop_delay_msecs: %lu, exceeds" |
| 1762 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
| 1763 | ALUA_MAX_NONOP_DELAY_MSECS); |
| 1764 | return -EINVAL; |
| 1765 | } |
| 1766 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; |
| 1767 | |
| 1768 | return count; |
| 1769 | } |
| 1770 | |
| 1771 | ssize_t core_alua_show_trans_delay_msecs( |
| 1772 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1773 | char *page) |
| 1774 | { |
| 1775 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); |
| 1776 | } |
| 1777 | |
| 1778 | ssize_t core_alua_store_trans_delay_msecs( |
| 1779 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1780 | const char *page, |
| 1781 | size_t count) |
| 1782 | { |
| 1783 | unsigned long tmp; |
| 1784 | int ret; |
| 1785 | |
| 1786 | ret = strict_strtoul(page, 0, &tmp); |
| 1787 | if (ret < 0) { |
| 1788 | printk(KERN_ERR "Unable to extract trans_delay_msecs\n"); |
| 1789 | return -EINVAL; |
| 1790 | } |
| 1791 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { |
| 1792 | printk(KERN_ERR "Passed trans_delay_msecs: %lu, exceeds" |
| 1793 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
| 1794 | ALUA_MAX_TRANS_DELAY_MSECS); |
| 1795 | return -EINVAL; |
| 1796 | } |
| 1797 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; |
| 1798 | |
| 1799 | return count; |
| 1800 | } |
| 1801 | |
| 1802 | ssize_t core_alua_show_preferred_bit( |
| 1803 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1804 | char *page) |
| 1805 | { |
| 1806 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); |
| 1807 | } |
| 1808 | |
| 1809 | ssize_t core_alua_store_preferred_bit( |
| 1810 | struct t10_alua_tg_pt_gp *tg_pt_gp, |
| 1811 | const char *page, |
| 1812 | size_t count) |
| 1813 | { |
| 1814 | unsigned long tmp; |
| 1815 | int ret; |
| 1816 | |
| 1817 | ret = strict_strtoul(page, 0, &tmp); |
| 1818 | if (ret < 0) { |
| 1819 | printk(KERN_ERR "Unable to extract preferred ALUA value\n"); |
| 1820 | return -EINVAL; |
| 1821 | } |
| 1822 | if ((tmp != 0) && (tmp != 1)) { |
| 1823 | printk(KERN_ERR "Illegal value for preferred ALUA: %lu\n", tmp); |
| 1824 | return -EINVAL; |
| 1825 | } |
| 1826 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; |
| 1827 | |
| 1828 | return count; |
| 1829 | } |
| 1830 | |
| 1831 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) |
| 1832 | { |
| 1833 | if (!(lun->lun_sep)) |
| 1834 | return -ENODEV; |
| 1835 | |
| 1836 | return sprintf(page, "%d\n", |
| 1837 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); |
| 1838 | } |
| 1839 | |
| 1840 | ssize_t core_alua_store_offline_bit( |
| 1841 | struct se_lun *lun, |
| 1842 | const char *page, |
| 1843 | size_t count) |
| 1844 | { |
| 1845 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; |
| 1846 | unsigned long tmp; |
| 1847 | int ret; |
| 1848 | |
| 1849 | if (!(lun->lun_sep)) |
| 1850 | return -ENODEV; |
| 1851 | |
| 1852 | ret = strict_strtoul(page, 0, &tmp); |
| 1853 | if (ret < 0) { |
| 1854 | printk(KERN_ERR "Unable to extract alua_tg_pt_offline value\n"); |
| 1855 | return -EINVAL; |
| 1856 | } |
| 1857 | if ((tmp != 0) && (tmp != 1)) { |
| 1858 | printk(KERN_ERR "Illegal value for alua_tg_pt_offline: %lu\n", |
| 1859 | tmp); |
| 1860 | return -EINVAL; |
| 1861 | } |
| 1862 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; |
| 1863 | if (!(tg_pt_gp_mem)) { |
| 1864 | printk(KERN_ERR "Unable to locate *tg_pt_gp_mem\n"); |
| 1865 | return -EINVAL; |
| 1866 | } |
| 1867 | |
| 1868 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, |
| 1869 | lun->lun_sep, 0, (int)tmp); |
| 1870 | if (ret < 0) |
| 1871 | return -EINVAL; |
| 1872 | |
| 1873 | return count; |
| 1874 | } |
| 1875 | |
| 1876 | ssize_t core_alua_show_secondary_status( |
| 1877 | struct se_lun *lun, |
| 1878 | char *page) |
| 1879 | { |
| 1880 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); |
| 1881 | } |
| 1882 | |
| 1883 | ssize_t core_alua_store_secondary_status( |
| 1884 | struct se_lun *lun, |
| 1885 | const char *page, |
| 1886 | size_t count) |
| 1887 | { |
| 1888 | unsigned long tmp; |
| 1889 | int ret; |
| 1890 | |
| 1891 | ret = strict_strtoul(page, 0, &tmp); |
| 1892 | if (ret < 0) { |
| 1893 | printk(KERN_ERR "Unable to extract alua_tg_pt_status\n"); |
| 1894 | return -EINVAL; |
| 1895 | } |
| 1896 | if ((tmp != ALUA_STATUS_NONE) && |
| 1897 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && |
| 1898 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { |
| 1899 | printk(KERN_ERR "Illegal value for alua_tg_pt_status: %lu\n", |
| 1900 | tmp); |
| 1901 | return -EINVAL; |
| 1902 | } |
| 1903 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; |
| 1904 | |
| 1905 | return count; |
| 1906 | } |
| 1907 | |
| 1908 | ssize_t core_alua_show_secondary_write_metadata( |
| 1909 | struct se_lun *lun, |
| 1910 | char *page) |
| 1911 | { |
| 1912 | return sprintf(page, "%d\n", |
| 1913 | lun->lun_sep->sep_tg_pt_secondary_write_md); |
| 1914 | } |
| 1915 | |
| 1916 | ssize_t core_alua_store_secondary_write_metadata( |
| 1917 | struct se_lun *lun, |
| 1918 | const char *page, |
| 1919 | size_t count) |
| 1920 | { |
| 1921 | unsigned long tmp; |
| 1922 | int ret; |
| 1923 | |
| 1924 | ret = strict_strtoul(page, 0, &tmp); |
| 1925 | if (ret < 0) { |
| 1926 | printk(KERN_ERR "Unable to extract alua_tg_pt_write_md\n"); |
| 1927 | return -EINVAL; |
| 1928 | } |
| 1929 | if ((tmp != 0) && (tmp != 1)) { |
| 1930 | printk(KERN_ERR "Illegal value for alua_tg_pt_write_md:" |
| 1931 | " %lu\n", tmp); |
| 1932 | return -EINVAL; |
| 1933 | } |
| 1934 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; |
| 1935 | |
| 1936 | return count; |
| 1937 | } |
| 1938 | |
| 1939 | int core_setup_alua(struct se_device *dev, int force_pt) |
| 1940 | { |
| 1941 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| 1942 | struct t10_alua *alua = T10_ALUA(su_dev); |
| 1943 | struct t10_alua_lu_gp_member *lu_gp_mem; |
| 1944 | /* |
| 1945 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic |
| 1946 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can |
| 1947 | * cause a problem because libata and some SATA RAID HBAs appear |
| 1948 | * under Linux/SCSI, but emulate SCSI logic themselves. |
| 1949 | */ |
| 1950 | if (((TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
| 1951 | !(DEV_ATTRIB(dev)->emulate_alua)) || force_pt) { |
| 1952 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
| 1953 | alua->alua_state_check = &core_alua_state_check_nop; |
| 1954 | printk(KERN_INFO "%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
| 1955 | " emulation\n", TRANSPORT(dev)->name); |
| 1956 | return 0; |
| 1957 | } |
| 1958 | /* |
| 1959 | * If SPC-3 or above is reported by real or emulated struct se_device, |
| 1960 | * use emulated ALUA. |
| 1961 | */ |
| 1962 | if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) { |
| 1963 | printk(KERN_INFO "%s: Enabling ALUA Emulation for SPC-3" |
| 1964 | " device\n", TRANSPORT(dev)->name); |
| 1965 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1966 | * Associate this struct se_device with the default ALUA |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1967 | * LUN Group. |
| 1968 | */ |
| 1969 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); |
| 1970 | if (IS_ERR(lu_gp_mem) || !lu_gp_mem) |
| 1971 | return -1; |
| 1972 | |
| 1973 | alua->alua_type = SPC3_ALUA_EMULATED; |
| 1974 | alua->alua_state_check = &core_alua_state_check; |
| 1975 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
| 1976 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
| 1977 | se_global->default_lu_gp); |
| 1978 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
| 1979 | |
| 1980 | printk(KERN_INFO "%s: Adding to default ALUA LU Group:" |
| 1981 | " core/alua/lu_gps/default_lu_gp\n", |
| 1982 | TRANSPORT(dev)->name); |
| 1983 | } else { |
| 1984 | alua->alua_type = SPC2_ALUA_DISABLED; |
| 1985 | alua->alua_state_check = &core_alua_state_check_nop; |
| 1986 | printk(KERN_INFO "%s: Disabling ALUA Emulation for SPC-2" |
| 1987 | " device\n", TRANSPORT(dev)->name); |
| 1988 | } |
| 1989 | |
| 1990 | return 0; |
| 1991 | } |