Commit | Line | Data |
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c66ac9db NB |
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 | ||
c66ac9db NB |
27 | #include <linux/slab.h> |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/configfs.h> | |
c53181af | 30 | #include <linux/export.h> |
c66ac9db NB |
31 | #include <scsi/scsi.h> |
32 | #include <scsi/scsi_cmnd.h> | |
33 | ||
34 | #include <target/target_core_base.h> | |
c4795fb2 CH |
35 | #include <target/target_core_backend.h> |
36 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
37 | #include <target/target_core_configfs.h> |
38 | ||
e26d99ae | 39 | #include "target_core_internal.h" |
c66ac9db | 40 | #include "target_core_alua.h" |
c66ac9db NB |
41 | #include "target_core_ua.h" |
42 | ||
43 | static int core_alua_check_transition(int state, int *primary); | |
44 | static int core_alua_set_tg_pt_secondary_state( | |
45 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
46 | struct se_port *port, int explict, int offline); | |
47 | ||
e3d6f909 AG |
48 | static u16 alua_lu_gps_counter; |
49 | static u32 alua_lu_gps_count; | |
50 | ||
51 | static DEFINE_SPINLOCK(lu_gps_lock); | |
52 | static LIST_HEAD(lu_gps_list); | |
53 | ||
54 | struct t10_alua_lu_gp *default_lu_gp; | |
55 | ||
c66ac9db NB |
56 | /* |
57 | * REPORT_TARGET_PORT_GROUPS | |
58 | * | |
59 | * See spc4r17 section 6.27 | |
60 | */ | |
e76a35d6 | 61 | int target_emulate_report_target_port_groups(struct se_task *task) |
c66ac9db | 62 | { |
e76a35d6 | 63 | struct se_cmd *cmd = task->task_se_cmd; |
5951146d | 64 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
c66ac9db NB |
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; | |
05d1c7c0 | 68 | unsigned char *buf; |
c66ac9db NB |
69 | u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
70 | Target port group descriptor */ | |
6b20fa9a NB |
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 | } | |
c66ac9db | 80 | |
05d1c7c0 AG |
81 | buf = transport_kmap_first_data_page(cmd); |
82 | ||
e3d6f909 AG |
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, | |
c66ac9db | 85 | tg_pt_gp_list) { |
6b20fa9a NB |
86 | /* |
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 | } | |
c66ac9db NB |
97 | /* |
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 | } | |
e3d6f909 | 157 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
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 | ||
05d1c7c0 AG |
166 | transport_kunmap_first_data_page(cmd); |
167 | ||
d29a5b6a CH |
168 | task->task_scsi_status = GOOD; |
169 | transport_complete_task(task, 1); | |
c66ac9db NB |
170 | return 0; |
171 | } | |
172 | ||
173 | /* | |
174 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. | |
175 | * | |
176 | * See spc4r17 section 6.35 | |
177 | */ | |
e76a35d6 | 178 | int target_emulate_set_target_port_groups(struct se_task *task) |
c66ac9db | 179 | { |
e76a35d6 | 180 | struct se_cmd *cmd = task->task_se_cmd; |
5951146d | 181 | struct se_device *dev = cmd->se_dev; |
e3d6f909 AG |
182 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
183 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; | |
184 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
185 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
186 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
05d1c7c0 AG |
187 | unsigned char *buf; |
188 | unsigned char *ptr; | |
c66ac9db NB |
189 | u32 len = 4; /* Skip over RESERVED area in header */ |
190 | int alua_access_state, primary = 0, rc; | |
191 | u16 tg_pt_id, rtpi; | |
192 | ||
03e98c9e NB |
193 | if (!l_port) { |
194 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
195 | return -EINVAL; | |
196 | } | |
05d1c7c0 AG |
197 | buf = transport_kmap_first_data_page(cmd); |
198 | ||
c66ac9db NB |
199 | /* |
200 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed | |
201 | * for the local tg_pt_gp. | |
202 | */ | |
203 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
204 | if (!l_tg_pt_gp_mem) { |
205 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); | |
03e98c9e NB |
206 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
207 | rc = -EINVAL; | |
05d1c7c0 | 208 | goto out; |
c66ac9db NB |
209 | } |
210 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
211 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 212 | if (!l_tg_pt_gp) { |
c66ac9db | 213 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 214 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
03e98c9e NB |
215 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
216 | rc = -EINVAL; | |
05d1c7c0 | 217 | goto out; |
c66ac9db NB |
218 | } |
219 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); | |
220 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
221 | ||
6708bb27 AG |
222 | if (!rc) { |
223 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" | |
c66ac9db | 224 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
03e98c9e NB |
225 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
226 | rc = -EINVAL; | |
05d1c7c0 | 227 | goto out; |
c66ac9db NB |
228 | } |
229 | ||
05d1c7c0 AG |
230 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
231 | ||
c66ac9db NB |
232 | while (len < cmd->data_length) { |
233 | alua_access_state = (ptr[0] & 0x0f); | |
234 | /* | |
235 | * Check the received ALUA access state, and determine if | |
236 | * the state is a primary or secondary target port asymmetric | |
237 | * access state. | |
238 | */ | |
239 | rc = core_alua_check_transition(alua_access_state, &primary); | |
240 | if (rc != 0) { | |
241 | /* | |
242 | * If the SET TARGET PORT GROUPS attempts to establish | |
243 | * an invalid combination of target port asymmetric | |
244 | * access states or attempts to establish an | |
245 | * unsupported target port asymmetric access state, | |
246 | * then the command shall be terminated with CHECK | |
247 | * CONDITION status, with the sense key set to ILLEGAL | |
248 | * REQUEST, and the additional sense code set to INVALID | |
249 | * FIELD IN PARAMETER LIST. | |
250 | */ | |
03e98c9e NB |
251 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
252 | rc = -EINVAL; | |
05d1c7c0 | 253 | goto out; |
c66ac9db NB |
254 | } |
255 | rc = -1; | |
256 | /* | |
257 | * If the ASYMMETRIC ACCESS STATE field (see table 267) | |
258 | * specifies a primary target port asymmetric access state, | |
259 | * then the TARGET PORT GROUP OR TARGET PORT field specifies | |
260 | * a primary target port group for which the primary target | |
261 | * port asymmetric access state shall be changed. If the | |
262 | * ASYMMETRIC ACCESS STATE field specifies a secondary target | |
263 | * port asymmetric access state, then the TARGET PORT GROUP OR | |
264 | * TARGET PORT field specifies the relative target port | |
265 | * identifier (see 3.1.120) of the target port for which the | |
266 | * secondary target port asymmetric access state shall be | |
267 | * changed. | |
268 | */ | |
269 | if (primary) { | |
270 | tg_pt_id = ((ptr[2] << 8) & 0xff); | |
271 | tg_pt_id |= (ptr[3] & 0xff); | |
272 | /* | |
273 | * Locate the matching target port group ID from | |
274 | * the global tg_pt_gp list | |
275 | */ | |
e3d6f909 | 276 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 277 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 278 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db | 279 | tg_pt_gp_list) { |
6708bb27 | 280 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
281 | continue; |
282 | ||
283 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) | |
284 | continue; | |
285 | ||
286 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
287 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 288 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
289 | |
290 | rc = core_alua_do_port_transition(tg_pt_gp, | |
291 | dev, l_port, nacl, | |
292 | alua_access_state, 1); | |
293 | ||
e3d6f909 | 294 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
295 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
296 | smp_mb__after_atomic_dec(); | |
297 | break; | |
298 | } | |
e3d6f909 | 299 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
300 | /* |
301 | * If not matching target port group ID can be located | |
302 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST | |
303 | */ | |
05d1c7c0 | 304 | if (rc != 0) { |
03e98c9e NB |
305 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
306 | rc = -EINVAL; | |
05d1c7c0 AG |
307 | goto out; |
308 | } | |
c66ac9db NB |
309 | } else { |
310 | /* | |
311 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
312 | * the Target Port in question for the the incoming | |
313 | * SET_TARGET_PORT_GROUPS op. | |
314 | */ | |
315 | rtpi = ((ptr[2] << 8) & 0xff); | |
316 | rtpi |= (ptr[3] & 0xff); | |
317 | /* | |
318 | * Locate the matching relative target port identifer | |
319 | * for the struct se_device storage object. | |
320 | */ | |
321 | spin_lock(&dev->se_port_lock); | |
322 | list_for_each_entry(port, &dev->dev_sep_list, | |
323 | sep_list) { | |
324 | if (port->sep_rtpi != rtpi) | |
325 | continue; | |
326 | ||
327 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
328 | spin_unlock(&dev->se_port_lock); | |
329 | ||
330 | rc = core_alua_set_tg_pt_secondary_state( | |
331 | tg_pt_gp_mem, port, 1, 1); | |
332 | ||
333 | spin_lock(&dev->se_port_lock); | |
334 | break; | |
335 | } | |
336 | spin_unlock(&dev->se_port_lock); | |
337 | /* | |
338 | * If not matching relative target port identifier can | |
339 | * be located, throw an exception with ASCQ: | |
340 | * INVALID_PARAMETER_LIST | |
341 | */ | |
05d1c7c0 | 342 | if (rc != 0) { |
03e98c9e NB |
343 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
344 | rc = -EINVAL; | |
05d1c7c0 AG |
345 | goto out; |
346 | } | |
c66ac9db NB |
347 | } |
348 | ||
349 | ptr += 4; | |
350 | len += 4; | |
351 | } | |
352 | ||
05d1c7c0 AG |
353 | out: |
354 | transport_kunmap_first_data_page(cmd); | |
d29a5b6a CH |
355 | task->task_scsi_status = GOOD; |
356 | transport_complete_task(task, 1); | |
c66ac9db NB |
357 | return 0; |
358 | } | |
359 | ||
360 | static inline int core_alua_state_nonoptimized( | |
361 | struct se_cmd *cmd, | |
362 | unsigned char *cdb, | |
363 | int nonop_delay_msecs, | |
364 | u8 *alua_ascq) | |
365 | { | |
366 | /* | |
367 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
368 | * later to determine if processing of this cmd needs to be | |
369 | * temporarily delayed for the Active/NonOptimized primary access state. | |
370 | */ | |
371 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
372 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static inline int core_alua_state_standby( | |
377 | struct se_cmd *cmd, | |
378 | unsigned char *cdb, | |
379 | u8 *alua_ascq) | |
380 | { | |
381 | /* | |
382 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
383 | * spc4r17 section 5.9.2.4.4 | |
384 | */ | |
385 | switch (cdb[0]) { | |
386 | case INQUIRY: | |
387 | case LOG_SELECT: | |
388 | case LOG_SENSE: | |
389 | case MODE_SELECT: | |
390 | case MODE_SENSE: | |
391 | case REPORT_LUNS: | |
392 | case RECEIVE_DIAGNOSTIC: | |
393 | case SEND_DIAGNOSTIC: | |
394 | case MAINTENANCE_IN: | |
395 | switch (cdb[1]) { | |
396 | case MI_REPORT_TARGET_PGS: | |
397 | return 0; | |
398 | default: | |
399 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
400 | return 1; | |
401 | } | |
402 | case MAINTENANCE_OUT: | |
403 | switch (cdb[1]) { | |
404 | case MO_SET_TARGET_PGS: | |
405 | return 0; | |
406 | default: | |
407 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
408 | return 1; | |
409 | } | |
410 | case REQUEST_SENSE: | |
411 | case PERSISTENT_RESERVE_IN: | |
412 | case PERSISTENT_RESERVE_OUT: | |
413 | case READ_BUFFER: | |
414 | case WRITE_BUFFER: | |
415 | return 0; | |
416 | default: | |
417 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
418 | return 1; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | static inline int core_alua_state_unavailable( | |
425 | struct se_cmd *cmd, | |
426 | unsigned char *cdb, | |
427 | u8 *alua_ascq) | |
428 | { | |
429 | /* | |
430 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
431 | * spc4r17 section 5.9.2.4.5 | |
432 | */ | |
433 | switch (cdb[0]) { | |
434 | case INQUIRY: | |
435 | case REPORT_LUNS: | |
436 | case MAINTENANCE_IN: | |
437 | switch (cdb[1]) { | |
438 | case MI_REPORT_TARGET_PGS: | |
439 | return 0; | |
440 | default: | |
441 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
442 | return 1; | |
443 | } | |
444 | case MAINTENANCE_OUT: | |
445 | switch (cdb[1]) { | |
446 | case MO_SET_TARGET_PGS: | |
447 | return 0; | |
448 | default: | |
449 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
450 | return 1; | |
451 | } | |
452 | case REQUEST_SENSE: | |
453 | case READ_BUFFER: | |
454 | case WRITE_BUFFER: | |
455 | return 0; | |
456 | default: | |
457 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
458 | return 1; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static inline int core_alua_state_transition( | |
465 | struct se_cmd *cmd, | |
466 | unsigned char *cdb, | |
467 | u8 *alua_ascq) | |
468 | { | |
469 | /* | |
470 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
471 | * spc4r17 section 5.9.2.5 | |
472 | */ | |
473 | switch (cdb[0]) { | |
474 | case INQUIRY: | |
475 | case REPORT_LUNS: | |
476 | case MAINTENANCE_IN: | |
477 | switch (cdb[1]) { | |
478 | case MI_REPORT_TARGET_PGS: | |
479 | return 0; | |
480 | default: | |
481 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
482 | return 1; | |
483 | } | |
484 | case REQUEST_SENSE: | |
485 | case READ_BUFFER: | |
486 | case WRITE_BUFFER: | |
487 | return 0; | |
488 | default: | |
489 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
490 | return 1; | |
491 | } | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | /* | |
497 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED | |
498 | * in transport_cmd_sequencer(). This function is assigned to | |
499 | * struct t10_alua *->state_check() in core_setup_alua() | |
500 | */ | |
501 | static int core_alua_state_check_nop( | |
502 | struct se_cmd *cmd, | |
503 | unsigned char *cdb, | |
504 | u8 *alua_ascq) | |
505 | { | |
506 | return 0; | |
507 | } | |
508 | ||
509 | /* | |
510 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). | |
511 | * This function is assigned to struct t10_alua *->state_check() in | |
512 | * core_setup_alua() | |
513 | * | |
514 | * Also, this function can return three different return codes to | |
515 | * signal transport_generic_cmd_sequencer() | |
516 | * | |
517 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready | |
518 | * return 0: Used to signal success | |
519 | * reutrn -1: Used to signal failure, and invalid cdb field | |
520 | */ | |
521 | static int core_alua_state_check( | |
522 | struct se_cmd *cmd, | |
523 | unsigned char *cdb, | |
524 | u8 *alua_ascq) | |
525 | { | |
e3d6f909 | 526 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
527 | struct se_port *port = lun->lun_sep; |
528 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
529 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
530 | int out_alua_state, nonop_delay_msecs; | |
531 | ||
6708bb27 | 532 | if (!port) |
c66ac9db NB |
533 | return 0; |
534 | /* | |
535 | * First, check for a struct se_port specific secondary ALUA target port | |
536 | * access state: OFFLINE | |
537 | */ | |
538 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
539 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
6708bb27 | 540 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db NB |
541 | " target port\n"); |
542 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
543 | return 1; | |
544 | } | |
545 | /* | |
546 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
547 | * ALUA target port group, to obtain current ALUA access state. | |
548 | * Otherwise look for the underlying struct se_device association with | |
549 | * a ALUA logical unit group. | |
550 | */ | |
551 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
552 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
553 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
554 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
555 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
556 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
557 | /* | |
25985edc LDM |
558 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
559 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
560 | * For the Optimized ALUA access state case, we want to process the |
561 | * incoming fabric cmd ASAP.. | |
562 | */ | |
563 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
564 | return 0; | |
565 | ||
566 | switch (out_alua_state) { | |
567 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
568 | return core_alua_state_nonoptimized(cmd, cdb, | |
569 | nonop_delay_msecs, alua_ascq); | |
570 | case ALUA_ACCESS_STATE_STANDBY: | |
571 | return core_alua_state_standby(cmd, cdb, alua_ascq); | |
572 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
573 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); | |
574 | case ALUA_ACCESS_STATE_TRANSITION: | |
575 | return core_alua_state_transition(cmd, cdb, alua_ascq); | |
576 | /* | |
577 | * OFFLINE is a secondary ALUA target port group access state, that is | |
578 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
579 | */ | |
580 | case ALUA_ACCESS_STATE_OFFLINE: | |
581 | default: | |
6708bb27 | 582 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 583 | out_alua_state); |
e3d6f909 | 584 | return -EINVAL; |
c66ac9db NB |
585 | } |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Check implict and explict ALUA state change request. | |
592 | */ | |
593 | static int core_alua_check_transition(int state, int *primary) | |
594 | { | |
595 | switch (state) { | |
596 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
597 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
598 | case ALUA_ACCESS_STATE_STANDBY: | |
599 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
600 | /* | |
601 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
602 | * defined as primary target port asymmetric access states. | |
603 | */ | |
604 | *primary = 1; | |
605 | break; | |
606 | case ALUA_ACCESS_STATE_OFFLINE: | |
607 | /* | |
608 | * OFFLINE state is defined as a secondary target port | |
609 | * asymmetric access state. | |
610 | */ | |
611 | *primary = 0; | |
612 | break; | |
613 | default: | |
6708bb27 | 614 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
e3d6f909 | 615 | return -EINVAL; |
c66ac9db NB |
616 | } |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static char *core_alua_dump_state(int state) | |
622 | { | |
623 | switch (state) { | |
624 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
625 | return "Active/Optimized"; | |
626 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
627 | return "Active/NonOptimized"; | |
628 | case ALUA_ACCESS_STATE_STANDBY: | |
629 | return "Standby"; | |
630 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
631 | return "Unavailable"; | |
632 | case ALUA_ACCESS_STATE_OFFLINE: | |
633 | return "Offline"; | |
634 | default: | |
635 | return "Unknown"; | |
636 | } | |
637 | ||
638 | return NULL; | |
639 | } | |
640 | ||
641 | char *core_alua_dump_status(int status) | |
642 | { | |
643 | switch (status) { | |
644 | case ALUA_STATUS_NONE: | |
645 | return "None"; | |
646 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
647 | return "Altered by Explict STPG"; | |
648 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
649 | return "Altered by Implict ALUA"; | |
650 | default: | |
651 | return "Unknown"; | |
652 | } | |
653 | ||
654 | return NULL; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Used by fabric modules to determine when we need to delay processing | |
659 | * for the Active/NonOptimized paths.. | |
660 | */ | |
661 | int core_alua_check_nonop_delay( | |
662 | struct se_cmd *cmd) | |
663 | { | |
664 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
665 | return 0; | |
666 | if (in_interrupt()) | |
667 | return 0; | |
668 | /* | |
669 | * The ALUA Active/NonOptimized access state delay can be disabled | |
670 | * in via configfs with a value of zero | |
671 | */ | |
6708bb27 | 672 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
673 | return 0; |
674 | /* | |
675 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
676 | * defined interval in core_alua_state_nonoptimized() | |
677 | */ | |
678 | msleep_interruptible(cmd->alua_nonop_delay); | |
679 | return 0; | |
680 | } | |
681 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
682 | ||
683 | /* | |
684 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
685 | * | |
686 | */ | |
687 | static int core_alua_write_tpg_metadata( | |
688 | const char *path, | |
689 | unsigned char *md_buf, | |
690 | u32 md_buf_len) | |
691 | { | |
692 | mm_segment_t old_fs; | |
693 | struct file *file; | |
694 | struct iovec iov[1]; | |
695 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; | |
696 | ||
697 | memset(iov, 0, sizeof(struct iovec)); | |
698 | ||
699 | file = filp_open(path, flags, 0600); | |
700 | if (IS_ERR(file) || !file || !file->f_dentry) { | |
6708bb27 | 701 | pr_err("filp_open(%s) for ALUA metadata failed\n", |
c66ac9db NB |
702 | path); |
703 | return -ENODEV; | |
704 | } | |
705 | ||
706 | iov[0].iov_base = &md_buf[0]; | |
707 | iov[0].iov_len = md_buf_len; | |
708 | ||
709 | old_fs = get_fs(); | |
710 | set_fs(get_ds()); | |
711 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); | |
712 | set_fs(old_fs); | |
713 | ||
714 | if (ret < 0) { | |
6708bb27 | 715 | pr_err("Error writing ALUA metadata file: %s\n", path); |
c66ac9db NB |
716 | filp_close(file, NULL); |
717 | return -EIO; | |
718 | } | |
719 | filp_close(file, NULL); | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | /* | |
725 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
726 | */ | |
727 | static int core_alua_update_tpg_primary_metadata( | |
728 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
729 | int primary_state, | |
730 | unsigned char *md_buf) | |
731 | { | |
732 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
733 | struct t10_wwn *wwn = &su_dev->t10_wwn; | |
734 | char path[ALUA_METADATA_PATH_LEN]; | |
735 | int len; | |
736 | ||
737 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
738 | ||
739 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
740 | "tg_pt_gp_id=%hu\n" | |
741 | "alua_access_state=0x%02x\n" | |
742 | "alua_access_status=0x%02x\n", | |
743 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
744 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
745 | ||
746 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
747 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
748 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
749 | ||
750 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
751 | } | |
752 | ||
753 | static int core_alua_do_transition_tg_pt( | |
754 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
755 | struct se_port *l_port, | |
756 | struct se_node_acl *nacl, | |
757 | unsigned char *md_buf, | |
758 | int new_state, | |
759 | int explict) | |
760 | { | |
761 | struct se_dev_entry *se_deve; | |
762 | struct se_lun_acl *lacl; | |
763 | struct se_port *port; | |
764 | struct t10_alua_tg_pt_gp_member *mem; | |
765 | int old_state = 0; | |
766 | /* | |
767 | * Save the old primary ALUA access state, and set the current state | |
768 | * to ALUA_ACCESS_STATE_TRANSITION. | |
769 | */ | |
770 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
771 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
772 | ALUA_ACCESS_STATE_TRANSITION); | |
773 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
774 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
775 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
776 | /* | |
777 | * Check for the optional ALUA primary state transition delay | |
778 | */ | |
779 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
780 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
781 | ||
782 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
783 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
784 | tg_pt_gp_mem_list) { | |
785 | port = mem->tg_pt; | |
786 | /* | |
787 | * After an implicit target port asymmetric access state | |
788 | * change, a device server shall establish a unit attention | |
789 | * condition for the initiator port associated with every I_T | |
790 | * nexus with the additional sense code set to ASYMMETRIC | |
791 | * ACCESS STATE CHAGED. | |
792 | * | |
793 | * After an explicit target port asymmetric access state | |
794 | * change, a device server shall establish a unit attention | |
795 | * condition with the additional sense code set to ASYMMETRIC | |
796 | * ACCESS STATE CHANGED for the initiator port associated with | |
797 | * every I_T nexus other than the I_T nexus on which the SET | |
798 | * TARGET PORT GROUPS command | |
799 | */ | |
800 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
801 | smp_mb__after_atomic_inc(); | |
802 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
803 | ||
804 | spin_lock_bh(&port->sep_alua_lock); | |
805 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
806 | alua_port_list) { | |
807 | lacl = se_deve->se_lun_acl; | |
808 | /* | |
809 | * se_deve->se_lun_acl pointer may be NULL for a | |
810 | * entry created without explict Node+MappedLUN ACLs | |
811 | */ | |
6708bb27 | 812 | if (!lacl) |
c66ac9db NB |
813 | continue; |
814 | ||
815 | if (explict && | |
816 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
817 | (l_port != NULL) && (l_port == port)) | |
818 | continue; | |
819 | ||
820 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
821 | se_deve->mapped_lun, 0x2A, | |
822 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
823 | } | |
824 | spin_unlock_bh(&port->sep_alua_lock); | |
825 | ||
826 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
827 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
828 | smp_mb__after_atomic_dec(); | |
829 | } | |
830 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
831 | /* | |
832 | * Update the ALUA metadata buf that has been allocated in | |
833 | * core_alua_do_port_transition(), this metadata will be written | |
834 | * to struct file. | |
835 | * | |
836 | * Note that there is the case where we do not want to update the | |
837 | * metadata when the saved metadata is being parsed in userspace | |
838 | * when setting the existing port access state and access status. | |
839 | * | |
840 | * Also note that the failure to write out the ALUA metadata to | |
841 | * struct file does NOT affect the actual ALUA transition. | |
842 | */ | |
843 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
844 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
845 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
846 | new_state, md_buf); | |
847 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
848 | } | |
849 | /* | |
850 | * Set the current primary ALUA access state to the requested new state | |
851 | */ | |
852 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
853 | ||
6708bb27 | 854 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
855 | " from primary access state %s to %s\n", (explict) ? "explict" : |
856 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
857 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
858 | core_alua_dump_state(new_state)); | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
863 | int core_alua_do_port_transition( | |
864 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
865 | struct se_device *l_dev, | |
866 | struct se_port *l_port, | |
867 | struct se_node_acl *l_nacl, | |
868 | int new_state, | |
869 | int explict) | |
870 | { | |
871 | struct se_device *dev; | |
872 | struct se_port *port; | |
873 | struct se_subsystem_dev *su_dev; | |
874 | struct se_node_acl *nacl; | |
875 | struct t10_alua_lu_gp *lu_gp; | |
876 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
877 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
878 | unsigned char *md_buf; | |
879 | int primary; | |
880 | ||
881 | if (core_alua_check_transition(new_state, &primary) != 0) | |
882 | return -EINVAL; | |
883 | ||
884 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
885 | if (!md_buf) { |
886 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
887 | return -ENOMEM; |
888 | } | |
889 | ||
890 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
891 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
892 | lu_gp = local_lu_gp_mem->lu_gp; | |
893 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
894 | smp_mb__after_atomic_inc(); | |
895 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
896 | /* | |
897 | * For storage objects that are members of the 'default_lu_gp', | |
898 | * we only do transition on the passed *l_tp_pt_gp, and not | |
899 | * on all of the matching target port groups IDs in default_lu_gp. | |
900 | */ | |
6708bb27 | 901 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
902 | /* |
903 | * core_alua_do_transition_tg_pt() will always return | |
904 | * success. | |
905 | */ | |
906 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
907 | md_buf, new_state, explict); | |
908 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
909 | smp_mb__after_atomic_dec(); | |
910 | kfree(md_buf); | |
911 | return 0; | |
912 | } | |
913 | /* | |
914 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
915 | * the associated storage objects looking for a matching target port | |
916 | * group ID from the local target port group. | |
917 | */ | |
918 | spin_lock(&lu_gp->lu_gp_lock); | |
919 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
920 | lu_gp_mem_list) { | |
921 | ||
922 | dev = lu_gp_mem->lu_gp_mem_dev; | |
923 | su_dev = dev->se_sub_dev; | |
924 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
925 | smp_mb__after_atomic_inc(); | |
926 | spin_unlock(&lu_gp->lu_gp_lock); | |
927 | ||
e3d6f909 | 928 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 929 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 930 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
931 | tg_pt_gp_list) { |
932 | ||
6708bb27 | 933 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
934 | continue; |
935 | /* | |
936 | * If the target behavior port asymmetric access state | |
937 | * is changed for any target port group accessiable via | |
938 | * a logical unit within a LU group, the target port | |
939 | * behavior group asymmetric access states for the same | |
940 | * target port group accessible via other logical units | |
941 | * in that LU group will also change. | |
942 | */ | |
943 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
944 | continue; | |
945 | ||
946 | if (l_tg_pt_gp == tg_pt_gp) { | |
947 | port = l_port; | |
948 | nacl = l_nacl; | |
949 | } else { | |
950 | port = NULL; | |
951 | nacl = NULL; | |
952 | } | |
953 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
954 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 955 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
956 | /* |
957 | * core_alua_do_transition_tg_pt() will always return | |
958 | * success. | |
959 | */ | |
960 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
961 | nacl, md_buf, new_state, explict); | |
962 | ||
e3d6f909 | 963 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
964 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
965 | smp_mb__after_atomic_dec(); | |
966 | } | |
e3d6f909 | 967 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
968 | |
969 | spin_lock(&lu_gp->lu_gp_lock); | |
970 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
971 | smp_mb__after_atomic_dec(); | |
972 | } | |
973 | spin_unlock(&lu_gp->lu_gp_lock); | |
974 | ||
6708bb27 | 975 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
976 | " Group IDs: %hu %s transition to primary state: %s\n", |
977 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
978 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
979 | core_alua_dump_state(new_state)); | |
980 | ||
981 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
982 | smp_mb__after_atomic_dec(); | |
983 | kfree(md_buf); | |
984 | return 0; | |
985 | } | |
986 | ||
987 | /* | |
988 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
989 | */ | |
990 | static int core_alua_update_tpg_secondary_metadata( | |
991 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
992 | struct se_port *port, | |
993 | unsigned char *md_buf, | |
994 | u32 md_buf_len) | |
995 | { | |
996 | struct se_portal_group *se_tpg = port->sep_tpg; | |
997 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
998 | int len; | |
999 | ||
1000 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
1001 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
1002 | ||
1003 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 1004 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 1005 | |
e3d6f909 | 1006 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 1007 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 1008 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
1009 | |
1010 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
1011 | "alua_tg_pt_status=0x%02x\n", | |
1012 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
1013 | port->sep_tg_pt_secondary_stat); | |
1014 | ||
1015 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 1016 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
1017 | port->sep_lun->unpacked_lun); |
1018 | ||
1019 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
1020 | } | |
1021 | ||
1022 | static int core_alua_set_tg_pt_secondary_state( | |
1023 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1024 | struct se_port *port, | |
1025 | int explict, | |
1026 | int offline) | |
1027 | { | |
1028 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1029 | unsigned char *md_buf; | |
1030 | u32 md_buf_len; | |
1031 | int trans_delay_msecs; | |
1032 | ||
1033 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1034 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1035 | if (!tg_pt_gp) { |
c66ac9db | 1036 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1037 | pr_err("Unable to complete secondary state" |
c66ac9db | 1038 | " transition\n"); |
e3d6f909 | 1039 | return -EINVAL; |
c66ac9db NB |
1040 | } |
1041 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1042 | /* | |
1043 | * Set the secondary ALUA target port access state to OFFLINE | |
1044 | * or release the previously secondary state for struct se_port | |
1045 | */ | |
1046 | if (offline) | |
1047 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1048 | else | |
1049 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1050 | ||
1051 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1052 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1053 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1054 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1055 | ||
6708bb27 | 1056 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1057 | " to secondary access state: %s\n", (explict) ? "explict" : |
1058 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1059 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1060 | ||
1061 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1062 | /* | |
1063 | * Do the optional transition delay after we set the secondary | |
1064 | * ALUA access state. | |
1065 | */ | |
1066 | if (trans_delay_msecs != 0) | |
1067 | msleep_interruptible(trans_delay_msecs); | |
1068 | /* | |
1069 | * See if we need to update the ALUA fabric port metadata for | |
1070 | * secondary state and status | |
1071 | */ | |
1072 | if (port->sep_tg_pt_secondary_write_md) { | |
1073 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1074 | if (!md_buf) { |
1075 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1076 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1077 | return -ENOMEM; |
c66ac9db NB |
1078 | } |
1079 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1080 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1081 | md_buf, md_buf_len); | |
1082 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1083 | ||
1084 | kfree(md_buf); | |
1085 | } | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | struct t10_alua_lu_gp * | |
1091 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1092 | { | |
1093 | struct t10_alua_lu_gp *lu_gp; | |
1094 | ||
1095 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1096 | if (!lu_gp) { |
1097 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1098 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1099 | } |
e3d6f909 | 1100 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1101 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1102 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1103 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1104 | ||
1105 | if (def_group) { | |
e3d6f909 | 1106 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1107 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1108 | alua_lu_gps_count++; |
c66ac9db NB |
1109 | } |
1110 | ||
1111 | return lu_gp; | |
1112 | } | |
1113 | ||
1114 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1115 | { | |
1116 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1117 | u16 lu_gp_id_tmp; | |
1118 | /* | |
1119 | * The lu_gp->lu_gp_id may only be set once.. | |
1120 | */ | |
1121 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1122 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1123 | " ignoring request\n"); |
e3d6f909 | 1124 | return -EINVAL; |
c66ac9db NB |
1125 | } |
1126 | ||
e3d6f909 AG |
1127 | spin_lock(&lu_gps_lock); |
1128 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1129 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1130 | " 0x0000ffff reached\n"); |
e3d6f909 | 1131 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1132 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1133 | return -ENOSPC; |
c66ac9db NB |
1134 | } |
1135 | again: | |
1136 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1137 | alua_lu_gps_counter++; |
c66ac9db | 1138 | |
e3d6f909 | 1139 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1140 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1141 | if (!lu_gp_id) |
c66ac9db NB |
1142 | goto again; |
1143 | ||
6708bb27 | 1144 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1145 | " already exists, ignoring request\n", |
1146 | lu_gp_id); | |
e3d6f909 AG |
1147 | spin_unlock(&lu_gps_lock); |
1148 | return -EINVAL; | |
c66ac9db NB |
1149 | } |
1150 | } | |
1151 | ||
1152 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1153 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1154 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1155 | alua_lu_gps_count++; | |
1156 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1157 | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static struct t10_alua_lu_gp_member * | |
1162 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1163 | { | |
1164 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1165 | ||
1166 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1167 | if (!lu_gp_mem) { |
1168 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1169 | return ERR_PTR(-ENOMEM); |
1170 | } | |
1171 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1172 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1173 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1174 | ||
1175 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1176 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1177 | ||
1178 | return lu_gp_mem; | |
1179 | } | |
1180 | ||
1181 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1182 | { | |
1183 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1184 | /* | |
1185 | * Once we have reached this point, config_item_put() has | |
1186 | * already been called from target_core_alua_drop_lu_gp(). | |
1187 | * | |
1188 | * Here, we remove the *lu_gp from the global list so that | |
1189 | * no associations can be made while we are releasing | |
1190 | * struct t10_alua_lu_gp. | |
1191 | */ | |
e3d6f909 | 1192 | spin_lock(&lu_gps_lock); |
e3d6f909 AG |
1193 | list_del(&lu_gp->lu_gp_node); |
1194 | alua_lu_gps_count--; | |
1195 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1196 | /* |
1197 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1198 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1199 | * released with core_alua_put_lu_gp_from_name() | |
1200 | */ | |
1201 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1202 | cpu_relax(); | |
1203 | /* | |
1204 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1205 | * struct se_device. | |
1206 | */ | |
1207 | spin_lock(&lu_gp->lu_gp_lock); | |
1208 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1209 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1210 | if (lu_gp_mem->lu_gp_assoc) { | |
1211 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1212 | lu_gp->lu_gp_members--; | |
1213 | lu_gp_mem->lu_gp_assoc = 0; | |
1214 | } | |
1215 | spin_unlock(&lu_gp->lu_gp_lock); | |
1216 | /* | |
1217 | * | |
25985edc | 1218 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1219 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1220 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1221 | * | |
1222 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1223 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1224 | */ | |
1225 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1226 | if (lu_gp != default_lu_gp) |
c66ac9db | 1227 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1228 | default_lu_gp); |
c66ac9db NB |
1229 | else |
1230 | lu_gp_mem->lu_gp = NULL; | |
1231 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1232 | ||
1233 | spin_lock(&lu_gp->lu_gp_lock); | |
1234 | } | |
1235 | spin_unlock(&lu_gp->lu_gp_lock); | |
1236 | ||
1237 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1238 | } | |
1239 | ||
1240 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1241 | { | |
1242 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1243 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1244 | struct t10_alua_lu_gp *lu_gp; |
1245 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1246 | ||
1247 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1248 | return; | |
1249 | ||
1250 | lu_gp_mem = dev->dev_alua_lu_gp_mem; | |
6708bb27 | 1251 | if (!lu_gp_mem) |
c66ac9db NB |
1252 | return; |
1253 | ||
1254 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1255 | cpu_relax(); | |
1256 | ||
1257 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1258 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1259 | if (lu_gp) { |
c66ac9db NB |
1260 | spin_lock(&lu_gp->lu_gp_lock); |
1261 | if (lu_gp_mem->lu_gp_assoc) { | |
1262 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1263 | lu_gp->lu_gp_members--; | |
1264 | lu_gp_mem->lu_gp_assoc = 0; | |
1265 | } | |
1266 | spin_unlock(&lu_gp->lu_gp_lock); | |
1267 | lu_gp_mem->lu_gp = NULL; | |
1268 | } | |
1269 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1270 | ||
1271 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1272 | } | |
1273 | ||
1274 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1275 | { | |
1276 | struct t10_alua_lu_gp *lu_gp; | |
1277 | struct config_item *ci; | |
1278 | ||
e3d6f909 AG |
1279 | spin_lock(&lu_gps_lock); |
1280 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1281 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1282 | continue; |
1283 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1284 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1285 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1286 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1287 | return lu_gp; |
1288 | } | |
1289 | } | |
e3d6f909 | 1290 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1291 | |
1292 | return NULL; | |
1293 | } | |
1294 | ||
1295 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1296 | { | |
e3d6f909 | 1297 | spin_lock(&lu_gps_lock); |
c66ac9db | 1298 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1299 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1300 | } |
1301 | ||
1302 | /* | |
1303 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1304 | */ | |
1305 | void __core_alua_attach_lu_gp_mem( | |
1306 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1307 | struct t10_alua_lu_gp *lu_gp) | |
1308 | { | |
1309 | spin_lock(&lu_gp->lu_gp_lock); | |
1310 | lu_gp_mem->lu_gp = lu_gp; | |
1311 | lu_gp_mem->lu_gp_assoc = 1; | |
1312 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1313 | lu_gp->lu_gp_members++; | |
1314 | spin_unlock(&lu_gp->lu_gp_lock); | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1319 | */ | |
1320 | void __core_alua_drop_lu_gp_mem( | |
1321 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1322 | struct t10_alua_lu_gp *lu_gp) | |
1323 | { | |
1324 | spin_lock(&lu_gp->lu_gp_lock); | |
1325 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1326 | lu_gp_mem->lu_gp = NULL; | |
1327 | lu_gp_mem->lu_gp_assoc = 0; | |
1328 | lu_gp->lu_gp_members--; | |
1329 | spin_unlock(&lu_gp->lu_gp_lock); | |
1330 | } | |
1331 | ||
1332 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( | |
1333 | struct se_subsystem_dev *su_dev, | |
1334 | const char *name, | |
1335 | int def_group) | |
1336 | { | |
1337 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1338 | ||
1339 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1340 | if (!tg_pt_gp) { |
1341 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1342 | return NULL; |
1343 | } | |
1344 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1345 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1346 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1347 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1348 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
1349 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; | |
1350 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; | |
1351 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1352 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1353 | /* | |
1354 | * Enable both explict and implict ALUA support by default | |
1355 | */ | |
1356 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1357 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1358 | /* | |
1359 | * Set the default Active/NonOptimized Delay in milliseconds | |
1360 | */ | |
1361 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1362 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
1363 | ||
1364 | if (def_group) { | |
e3d6f909 | 1365 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1366 | tg_pt_gp->tg_pt_gp_id = |
e3d6f909 | 1367 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1368 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
e3d6f909 | 1369 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1370 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
e3d6f909 AG |
1371 | &su_dev->t10_alua.tg_pt_gps_list); |
1372 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1373 | } |
1374 | ||
1375 | return tg_pt_gp; | |
1376 | } | |
1377 | ||
1378 | int core_alua_set_tg_pt_gp_id( | |
1379 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1380 | u16 tg_pt_gp_id) | |
1381 | { | |
1382 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1383 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; | |
1384 | u16 tg_pt_gp_id_tmp; | |
1385 | /* | |
1386 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1387 | */ | |
1388 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1389 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1390 | " ignoring request\n"); |
e3d6f909 | 1391 | return -EINVAL; |
c66ac9db NB |
1392 | } |
1393 | ||
e3d6f909 AG |
1394 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1395 | if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1396 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1397 | " 0x0000ffff reached\n"); |
e3d6f909 | 1398 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1399 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1400 | return -ENOSPC; |
c66ac9db NB |
1401 | } |
1402 | again: | |
1403 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
e3d6f909 | 1404 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1405 | |
e3d6f909 | 1406 | list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1407 | tg_pt_gp_list) { |
1408 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1409 | if (!tg_pt_gp_id) |
c66ac9db NB |
1410 | goto again; |
1411 | ||
6708bb27 | 1412 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1413 | " exists, ignoring request\n", tg_pt_gp_id); |
e3d6f909 AG |
1414 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
1415 | return -EINVAL; | |
c66ac9db NB |
1416 | } |
1417 | } | |
1418 | ||
1419 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1420 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1421 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
e3d6f909 AG |
1422 | &su_dev->t10_alua.tg_pt_gps_list); |
1423 | su_dev->t10_alua.alua_tg_pt_gps_count++; | |
1424 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1425 | |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1430 | struct se_port *port) | |
1431 | { | |
1432 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1433 | ||
1434 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1435 | GFP_KERNEL); | |
6708bb27 AG |
1436 | if (!tg_pt_gp_mem) { |
1437 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1438 | return ERR_PTR(-ENOMEM); |
1439 | } | |
1440 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1441 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1442 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1443 | ||
1444 | tg_pt_gp_mem->tg_pt = port; | |
1445 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
c66ac9db NB |
1446 | |
1447 | return tg_pt_gp_mem; | |
1448 | } | |
1449 | ||
1450 | void core_alua_free_tg_pt_gp( | |
1451 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1452 | { | |
1453 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1454 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; | |
1455 | /* | |
1456 | * Once we have reached this point, config_item_put() has already | |
1457 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1458 | * | |
1459 | * Here we remove *tg_pt_gp from the global list so that | |
1460 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1461 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1462 | */ | |
e3d6f909 | 1463 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1464 | list_del(&tg_pt_gp->tg_pt_gp_list); |
e3d6f909 AG |
1465 | su_dev->t10_alua.alua_tg_pt_gps_counter--; |
1466 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1467 | /* |
1468 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1469 | * core_alua_get_tg_pt_gp_by_name() in | |
1470 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1471 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1472 | */ | |
1473 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1474 | cpu_relax(); | |
1475 | /* | |
1476 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1477 | * struct se_port. | |
1478 | */ | |
1479 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1480 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1481 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1482 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1483 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1484 | tg_pt_gp->tg_pt_gp_members--; | |
1485 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1486 | } | |
1487 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1488 | /* | |
25985edc | 1489 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1490 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1491 | * core_alua_free_tg_pt_gp_mem(). | |
1492 | * | |
1493 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1494 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1495 | * default_tg_pt_gp. | |
1496 | */ | |
1497 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
e3d6f909 | 1498 | if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1499 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
e3d6f909 | 1500 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1501 | } else |
1502 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1503 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1504 | ||
1505 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1506 | } | |
1507 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1508 | ||
1509 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1510 | } | |
1511 | ||
1512 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1513 | { | |
1514 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
e3d6f909 | 1515 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1516 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1517 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1518 | ||
1519 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1520 | return; | |
1521 | ||
1522 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1523 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1524 | return; |
1525 | ||
1526 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1527 | cpu_relax(); | |
1528 | ||
1529 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1530 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1531 | if (tg_pt_gp) { |
c66ac9db NB |
1532 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1533 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1534 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1535 | tg_pt_gp->tg_pt_gp_members--; | |
1536 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1537 | } | |
1538 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1539 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1540 | } | |
1541 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1542 | ||
1543 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1544 | } | |
1545 | ||
1546 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
1547 | struct se_subsystem_dev *su_dev, | |
1548 | const char *name) | |
1549 | { | |
1550 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1551 | struct config_item *ci; | |
1552 | ||
e3d6f909 AG |
1553 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1554 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1555 | tg_pt_gp_list) { |
6708bb27 | 1556 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1557 | continue; |
1558 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1559 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1560 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1561 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1562 | return tg_pt_gp; |
1563 | } | |
1564 | } | |
e3d6f909 | 1565 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1566 | |
1567 | return NULL; | |
1568 | } | |
1569 | ||
1570 | static void core_alua_put_tg_pt_gp_from_name( | |
1571 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1572 | { | |
1573 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1574 | ||
e3d6f909 | 1575 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1576 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1577 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1578 | } |
1579 | ||
1580 | /* | |
1581 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1582 | */ | |
1583 | void __core_alua_attach_tg_pt_gp_mem( | |
1584 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1585 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1586 | { | |
1587 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1588 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1589 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1590 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1591 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1592 | tg_pt_gp->tg_pt_gp_members++; | |
1593 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1594 | } | |
1595 | ||
1596 | /* | |
1597 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1598 | */ | |
1599 | static void __core_alua_drop_tg_pt_gp_mem( | |
1600 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1601 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1602 | { | |
1603 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1604 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1605 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1606 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1607 | tg_pt_gp->tg_pt_gp_members--; | |
1608 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1609 | } | |
1610 | ||
1611 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1612 | { | |
1613 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1614 | struct config_item *tg_pt_ci; | |
e3d6f909 | 1615 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1616 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1617 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1618 | ssize_t len = 0; | |
1619 | ||
1620 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1621 | return len; | |
1622 | ||
1623 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1624 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1625 | return len; |
1626 | ||
1627 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1628 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1629 | if (tg_pt_gp) { |
c66ac9db NB |
1630 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1631 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1632 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1633 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1634 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1635 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1636 | core_alua_dump_state(atomic_read( | |
1637 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1638 | core_alua_dump_status( | |
1639 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1640 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1641 | "Offline" : "None", | |
1642 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1643 | } | |
1644 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1645 | ||
1646 | return len; | |
1647 | } | |
1648 | ||
1649 | ssize_t core_alua_store_tg_pt_gp_info( | |
1650 | struct se_port *port, | |
1651 | const char *page, | |
1652 | size_t count) | |
1653 | { | |
1654 | struct se_portal_group *tpg; | |
1655 | struct se_lun *lun; | |
1656 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1657 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; | |
1658 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1659 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1660 | int move = 0; | |
1661 | ||
1662 | tpg = port->sep_tpg; | |
1663 | lun = port->sep_lun; | |
1664 | ||
e3d6f909 | 1665 | if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) { |
6708bb27 | 1666 | pr_warn("SPC3_ALUA_EMULATED not enabled for" |
e3d6f909 AG |
1667 | " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1668 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1669 | config_item_name(&lun->lun_group.cg_item)); |
1670 | return -EINVAL; | |
1671 | } | |
1672 | ||
1673 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1674 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1675 | return -EINVAL; |
1676 | } | |
1677 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1678 | memcpy(buf, page, count); | |
1679 | /* | |
1680 | * Any ALUA target port group alias besides "NULL" means we will be | |
1681 | * making a new group association. | |
1682 | */ | |
1683 | if (strcmp(strstrip(buf), "NULL")) { | |
1684 | /* | |
1685 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1686 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1687 | * core_alua_put_tg_pt_gp_from_name() below. | |
1688 | */ | |
1689 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, | |
1690 | strstrip(buf)); | |
6708bb27 | 1691 | if (!tg_pt_gp_new) |
c66ac9db NB |
1692 | return -ENODEV; |
1693 | } | |
1694 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1695 | if (!tg_pt_gp_mem) { |
c66ac9db NB |
1696 | if (tg_pt_gp_new) |
1697 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
6708bb27 | 1698 | pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
c66ac9db NB |
1699 | return -EINVAL; |
1700 | } | |
1701 | ||
1702 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1703 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1704 | if (tg_pt_gp) { |
c66ac9db NB |
1705 | /* |
1706 | * Clearing an existing tg_pt_gp association, and replacing | |
1707 | * with the default_tg_pt_gp. | |
1708 | */ | |
6708bb27 AG |
1709 | if (!tg_pt_gp_new) { |
1710 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1711 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1712 | " alua/%s, ID: %hu back to" | |
1713 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1714 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1715 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1716 | config_item_name(&lun->lun_group.cg_item), |
1717 | config_item_name( | |
1718 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1719 | tg_pt_gp->tg_pt_gp_id); | |
1720 | ||
1721 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1722 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
e3d6f909 | 1723 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1724 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1725 | ||
1726 | return count; | |
1727 | } | |
1728 | /* | |
1729 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1730 | */ | |
1731 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1732 | move = 1; | |
1733 | } | |
1734 | /* | |
1735 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1736 | */ | |
1737 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1738 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1739 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1740 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1741 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1742 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1743 | config_item_name(&lun->lun_group.cg_item), |
1744 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1745 | tg_pt_gp_new->tg_pt_gp_id); | |
1746 | ||
1747 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1748 | return count; | |
1749 | } | |
1750 | ||
1751 | ssize_t core_alua_show_access_type( | |
1752 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1753 | char *page) | |
1754 | { | |
1755 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1756 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1757 | return sprintf(page, "Implict and Explict\n"); | |
1758 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1759 | return sprintf(page, "Implict\n"); | |
1760 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1761 | return sprintf(page, "Explict\n"); | |
1762 | else | |
1763 | return sprintf(page, "None\n"); | |
1764 | } | |
1765 | ||
1766 | ssize_t core_alua_store_access_type( | |
1767 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1768 | const char *page, | |
1769 | size_t count) | |
1770 | { | |
1771 | unsigned long tmp; | |
1772 | int ret; | |
1773 | ||
1774 | ret = strict_strtoul(page, 0, &tmp); | |
1775 | if (ret < 0) { | |
6708bb27 | 1776 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1777 | return -EINVAL; |
1778 | } | |
1779 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1780 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1781 | " %lu\n", tmp); |
1782 | return -EINVAL; | |
1783 | } | |
1784 | if (tmp == 3) | |
1785 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1786 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1787 | else if (tmp == 2) | |
1788 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1789 | else if (tmp == 1) | |
1790 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1791 | else | |
1792 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1793 | ||
1794 | return count; | |
1795 | } | |
1796 | ||
1797 | ssize_t core_alua_show_nonop_delay_msecs( | |
1798 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1799 | char *page) | |
1800 | { | |
1801 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1802 | } | |
1803 | ||
1804 | ssize_t core_alua_store_nonop_delay_msecs( | |
1805 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1806 | const char *page, | |
1807 | size_t count) | |
1808 | { | |
1809 | unsigned long tmp; | |
1810 | int ret; | |
1811 | ||
1812 | ret = strict_strtoul(page, 0, &tmp); | |
1813 | if (ret < 0) { | |
6708bb27 | 1814 | pr_err("Unable to extract nonop_delay_msecs\n"); |
c66ac9db NB |
1815 | return -EINVAL; |
1816 | } | |
1817 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1818 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1819 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1820 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1821 | return -EINVAL; | |
1822 | } | |
1823 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1824 | ||
1825 | return count; | |
1826 | } | |
1827 | ||
1828 | ssize_t core_alua_show_trans_delay_msecs( | |
1829 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1830 | char *page) | |
1831 | { | |
1832 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
1833 | } | |
1834 | ||
1835 | ssize_t core_alua_store_trans_delay_msecs( | |
1836 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1837 | const char *page, | |
1838 | size_t count) | |
1839 | { | |
1840 | unsigned long tmp; | |
1841 | int ret; | |
1842 | ||
1843 | ret = strict_strtoul(page, 0, &tmp); | |
1844 | if (ret < 0) { | |
6708bb27 | 1845 | pr_err("Unable to extract trans_delay_msecs\n"); |
c66ac9db NB |
1846 | return -EINVAL; |
1847 | } | |
1848 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1849 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1850 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1851 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1852 | return -EINVAL; | |
1853 | } | |
1854 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1855 | ||
1856 | return count; | |
1857 | } | |
1858 | ||
1859 | ssize_t core_alua_show_preferred_bit( | |
1860 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1861 | char *page) | |
1862 | { | |
1863 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1864 | } | |
1865 | ||
1866 | ssize_t core_alua_store_preferred_bit( | |
1867 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1868 | const char *page, | |
1869 | size_t count) | |
1870 | { | |
1871 | unsigned long tmp; | |
1872 | int ret; | |
1873 | ||
1874 | ret = strict_strtoul(page, 0, &tmp); | |
1875 | if (ret < 0) { | |
6708bb27 | 1876 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1877 | return -EINVAL; |
1878 | } | |
1879 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1880 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1881 | return -EINVAL; |
1882 | } | |
1883 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1884 | ||
1885 | return count; | |
1886 | } | |
1887 | ||
1888 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1889 | { | |
6708bb27 | 1890 | if (!lun->lun_sep) |
c66ac9db NB |
1891 | return -ENODEV; |
1892 | ||
1893 | return sprintf(page, "%d\n", | |
1894 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1895 | } | |
1896 | ||
1897 | ssize_t core_alua_store_offline_bit( | |
1898 | struct se_lun *lun, | |
1899 | const char *page, | |
1900 | size_t count) | |
1901 | { | |
1902 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1903 | unsigned long tmp; | |
1904 | int ret; | |
1905 | ||
6708bb27 | 1906 | if (!lun->lun_sep) |
c66ac9db NB |
1907 | return -ENODEV; |
1908 | ||
1909 | ret = strict_strtoul(page, 0, &tmp); | |
1910 | if (ret < 0) { | |
6708bb27 | 1911 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1912 | return -EINVAL; |
1913 | } | |
1914 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1915 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1916 | tmp); |
1917 | return -EINVAL; | |
1918 | } | |
1919 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1920 | if (!tg_pt_gp_mem) { |
1921 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1922 | return -EINVAL; |
1923 | } | |
1924 | ||
1925 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1926 | lun->lun_sep, 0, (int)tmp); | |
1927 | if (ret < 0) | |
1928 | return -EINVAL; | |
1929 | ||
1930 | return count; | |
1931 | } | |
1932 | ||
1933 | ssize_t core_alua_show_secondary_status( | |
1934 | struct se_lun *lun, | |
1935 | char *page) | |
1936 | { | |
1937 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1938 | } | |
1939 | ||
1940 | ssize_t core_alua_store_secondary_status( | |
1941 | struct se_lun *lun, | |
1942 | const char *page, | |
1943 | size_t count) | |
1944 | { | |
1945 | unsigned long tmp; | |
1946 | int ret; | |
1947 | ||
1948 | ret = strict_strtoul(page, 0, &tmp); | |
1949 | if (ret < 0) { | |
6708bb27 | 1950 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
1951 | return -EINVAL; |
1952 | } | |
1953 | if ((tmp != ALUA_STATUS_NONE) && | |
1954 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1955 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 1956 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
1957 | tmp); |
1958 | return -EINVAL; | |
1959 | } | |
1960 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
1961 | ||
1962 | return count; | |
1963 | } | |
1964 | ||
1965 | ssize_t core_alua_show_secondary_write_metadata( | |
1966 | struct se_lun *lun, | |
1967 | char *page) | |
1968 | { | |
1969 | return sprintf(page, "%d\n", | |
1970 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
1971 | } | |
1972 | ||
1973 | ssize_t core_alua_store_secondary_write_metadata( | |
1974 | struct se_lun *lun, | |
1975 | const char *page, | |
1976 | size_t count) | |
1977 | { | |
1978 | unsigned long tmp; | |
1979 | int ret; | |
1980 | ||
1981 | ret = strict_strtoul(page, 0, &tmp); | |
1982 | if (ret < 0) { | |
6708bb27 | 1983 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
1984 | return -EINVAL; |
1985 | } | |
1986 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1987 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
1988 | " %lu\n", tmp); |
1989 | return -EINVAL; | |
1990 | } | |
1991 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
1992 | ||
1993 | return count; | |
1994 | } | |
1995 | ||
1996 | int core_setup_alua(struct se_device *dev, int force_pt) | |
1997 | { | |
1998 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1999 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
2000 | struct t10_alua_lu_gp_member *lu_gp_mem; |
2001 | /* | |
2002 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic | |
2003 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can | |
2004 | * cause a problem because libata and some SATA RAID HBAs appear | |
2005 | * under Linux/SCSI, but emulate SCSI logic themselves. | |
2006 | */ | |
e3d6f909 AG |
2007 | if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
2008 | !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) { | |
c66ac9db NB |
2009 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
2010 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2011 | pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
e3d6f909 | 2012 | " emulation\n", dev->transport->name); |
c66ac9db NB |
2013 | return 0; |
2014 | } | |
2015 | /* | |
2016 | * If SPC-3 or above is reported by real or emulated struct se_device, | |
2017 | * use emulated ALUA. | |
2018 | */ | |
e3d6f909 | 2019 | if (dev->transport->get_device_rev(dev) >= SCSI_3) { |
6708bb27 | 2020 | pr_debug("%s: Enabling ALUA Emulation for SPC-3" |
e3d6f909 | 2021 | " device\n", dev->transport->name); |
c66ac9db | 2022 | /* |
25985edc | 2023 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
2024 | * LUN Group. |
2025 | */ | |
2026 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
2027 | if (IS_ERR(lu_gp_mem)) |
2028 | return PTR_ERR(lu_gp_mem); | |
c66ac9db NB |
2029 | |
2030 | alua->alua_type = SPC3_ALUA_EMULATED; | |
2031 | alua->alua_state_check = &core_alua_state_check; | |
2032 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
2033 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2034 | default_lu_gp); |
c66ac9db NB |
2035 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2036 | ||
6708bb27 | 2037 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2038 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2039 | dev->transport->name); |
c66ac9db NB |
2040 | } else { |
2041 | alua->alua_type = SPC2_ALUA_DISABLED; | |
2042 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2043 | pr_debug("%s: Disabling ALUA Emulation for SPC-2" |
e3d6f909 | 2044 | " device\n", dev->transport->name); |
c66ac9db NB |
2045 | } |
2046 | ||
2047 | return 0; | |
2048 | } |