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> | |
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 | ||
e3d6f909 AG |
49 | static u16 alua_lu_gps_counter; |
50 | static u32 alua_lu_gps_count; | |
51 | ||
52 | static DEFINE_SPINLOCK(lu_gps_lock); | |
53 | static LIST_HEAD(lu_gps_list); | |
54 | ||
55 | struct t10_alua_lu_gp *default_lu_gp; | |
56 | ||
c66ac9db NB |
57 | /* |
58 | * REPORT_TARGET_PORT_GROUPS | |
59 | * | |
60 | * See spc4r17 section 6.27 | |
61 | */ | |
e76a35d6 | 62 | int target_emulate_report_target_port_groups(struct se_task *task) |
c66ac9db | 63 | { |
e76a35d6 | 64 | struct se_cmd *cmd = task->task_se_cmd; |
5951146d | 65 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
c66ac9db NB |
66 | struct se_port *port; |
67 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
68 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
05d1c7c0 | 69 | unsigned char *buf; |
c66ac9db NB |
70 | u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
71 | Target port group descriptor */ | |
6b20fa9a NB |
72 | /* |
73 | * Need at least 4 bytes of response data or else we can't | |
74 | * even fit the return data length. | |
75 | */ | |
76 | if (cmd->data_length < 4) { | |
77 | pr_warn("REPORT TARGET PORT GROUPS allocation length %u" | |
78 | " too small\n", cmd->data_length); | |
79 | return -EINVAL; | |
80 | } | |
c66ac9db | 81 | |
05d1c7c0 AG |
82 | buf = transport_kmap_first_data_page(cmd); |
83 | ||
e3d6f909 AG |
84 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
85 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 86 | tg_pt_gp_list) { |
6b20fa9a NB |
87 | /* |
88 | * Check if the Target port group and Target port descriptor list | |
89 | * based on tg_pt_gp_members count will fit into the response payload. | |
90 | * Otherwise, bump rd_len to let the initiator know we have exceeded | |
91 | * the allocation length and the response is truncated. | |
92 | */ | |
93 | if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > | |
94 | cmd->data_length) { | |
95 | rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); | |
96 | continue; | |
97 | } | |
c66ac9db NB |
98 | /* |
99 | * PREF: Preferred target port bit, determine if this | |
100 | * bit should be set for port group. | |
101 | */ | |
102 | if (tg_pt_gp->tg_pt_gp_pref) | |
103 | buf[off] = 0x80; | |
104 | /* | |
105 | * Set the ASYMMETRIC ACCESS State | |
106 | */ | |
107 | buf[off++] |= (atomic_read( | |
108 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); | |
109 | /* | |
110 | * Set supported ASYMMETRIC ACCESS State bits | |
111 | */ | |
112 | buf[off] = 0x80; /* T_SUP */ | |
113 | buf[off] |= 0x40; /* O_SUP */ | |
114 | buf[off] |= 0x8; /* U_SUP */ | |
115 | buf[off] |= 0x4; /* S_SUP */ | |
116 | buf[off] |= 0x2; /* AN_SUP */ | |
117 | buf[off++] |= 0x1; /* AO_SUP */ | |
118 | /* | |
119 | * TARGET PORT GROUP | |
120 | */ | |
121 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); | |
122 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); | |
123 | ||
124 | off++; /* Skip over Reserved */ | |
125 | /* | |
126 | * STATUS CODE | |
127 | */ | |
128 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); | |
129 | /* | |
130 | * Vendor Specific field | |
131 | */ | |
132 | buf[off++] = 0x00; | |
133 | /* | |
134 | * TARGET PORT COUNT | |
135 | */ | |
136 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); | |
137 | rd_len += 8; | |
138 | ||
139 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
140 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
141 | tg_pt_gp_mem_list) { | |
142 | port = tg_pt_gp_mem->tg_pt; | |
143 | /* | |
144 | * Start Target Port descriptor format | |
145 | * | |
146 | * See spc4r17 section 6.2.7 Table 247 | |
147 | */ | |
148 | off += 2; /* Skip over Obsolete */ | |
149 | /* | |
150 | * Set RELATIVE TARGET PORT IDENTIFIER | |
151 | */ | |
152 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); | |
153 | buf[off++] = (port->sep_rtpi & 0xff); | |
154 | rd_len += 4; | |
155 | } | |
156 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
157 | } | |
e3d6f909 | 158 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
159 | /* |
160 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload | |
161 | */ | |
162 | buf[0] = ((rd_len >> 24) & 0xff); | |
163 | buf[1] = ((rd_len >> 16) & 0xff); | |
164 | buf[2] = ((rd_len >> 8) & 0xff); | |
165 | buf[3] = (rd_len & 0xff); | |
166 | ||
05d1c7c0 AG |
167 | transport_kunmap_first_data_page(cmd); |
168 | ||
d29a5b6a CH |
169 | task->task_scsi_status = GOOD; |
170 | transport_complete_task(task, 1); | |
c66ac9db NB |
171 | return 0; |
172 | } | |
173 | ||
174 | /* | |
175 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. | |
176 | * | |
177 | * See spc4r17 section 6.35 | |
178 | */ | |
e76a35d6 | 179 | int target_emulate_set_target_port_groups(struct se_task *task) |
c66ac9db | 180 | { |
e76a35d6 | 181 | struct se_cmd *cmd = task->task_se_cmd; |
5951146d | 182 | struct se_device *dev = cmd->se_dev; |
e3d6f909 AG |
183 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
184 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; | |
185 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
186 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
187 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
05d1c7c0 AG |
188 | unsigned char *buf; |
189 | unsigned char *ptr; | |
c66ac9db NB |
190 | u32 len = 4; /* Skip over RESERVED area in header */ |
191 | int alua_access_state, primary = 0, rc; | |
192 | u16 tg_pt_id, rtpi; | |
193 | ||
6708bb27 | 194 | if (!l_port) |
c66ac9db | 195 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
05d1c7c0 AG |
196 | |
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"); | |
05d1c7c0 AG |
206 | rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
207 | goto out; | |
c66ac9db NB |
208 | } |
209 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
210 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 211 | if (!l_tg_pt_gp) { |
c66ac9db | 212 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 213 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
05d1c7c0 AG |
214 | rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
215 | goto out; | |
c66ac9db NB |
216 | } |
217 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); | |
218 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
219 | ||
6708bb27 AG |
220 | if (!rc) { |
221 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" | |
c66ac9db | 222 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
05d1c7c0 AG |
223 | rc = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
224 | goto out; | |
c66ac9db NB |
225 | } |
226 | ||
05d1c7c0 AG |
227 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
228 | ||
c66ac9db NB |
229 | while (len < cmd->data_length) { |
230 | alua_access_state = (ptr[0] & 0x0f); | |
231 | /* | |
232 | * Check the received ALUA access state, and determine if | |
233 | * the state is a primary or secondary target port asymmetric | |
234 | * access state. | |
235 | */ | |
236 | rc = core_alua_check_transition(alua_access_state, &primary); | |
237 | if (rc != 0) { | |
238 | /* | |
239 | * If the SET TARGET PORT GROUPS attempts to establish | |
240 | * an invalid combination of target port asymmetric | |
241 | * access states or attempts to establish an | |
242 | * unsupported target port asymmetric access state, | |
243 | * then the command shall be terminated with CHECK | |
244 | * CONDITION status, with the sense key set to ILLEGAL | |
245 | * REQUEST, and the additional sense code set to INVALID | |
246 | * FIELD IN PARAMETER LIST. | |
247 | */ | |
05d1c7c0 AG |
248 | rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST; |
249 | goto out; | |
c66ac9db NB |
250 | } |
251 | rc = -1; | |
252 | /* | |
253 | * If the ASYMMETRIC ACCESS STATE field (see table 267) | |
254 | * specifies a primary target port asymmetric access state, | |
255 | * then the TARGET PORT GROUP OR TARGET PORT field specifies | |
256 | * a primary target port group for which the primary target | |
257 | * port asymmetric access state shall be changed. If the | |
258 | * ASYMMETRIC ACCESS STATE field specifies a secondary target | |
259 | * port asymmetric access state, then the TARGET PORT GROUP OR | |
260 | * TARGET PORT field specifies the relative target port | |
261 | * identifier (see 3.1.120) of the target port for which the | |
262 | * secondary target port asymmetric access state shall be | |
263 | * changed. | |
264 | */ | |
265 | if (primary) { | |
266 | tg_pt_id = ((ptr[2] << 8) & 0xff); | |
267 | tg_pt_id |= (ptr[3] & 0xff); | |
268 | /* | |
269 | * Locate the matching target port group ID from | |
270 | * the global tg_pt_gp list | |
271 | */ | |
e3d6f909 | 272 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 273 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 274 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db | 275 | tg_pt_gp_list) { |
6708bb27 | 276 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
277 | continue; |
278 | ||
279 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) | |
280 | continue; | |
281 | ||
282 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
283 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 284 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
285 | |
286 | rc = core_alua_do_port_transition(tg_pt_gp, | |
287 | dev, l_port, nacl, | |
288 | alua_access_state, 1); | |
289 | ||
e3d6f909 | 290 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
291 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
292 | smp_mb__after_atomic_dec(); | |
293 | break; | |
294 | } | |
e3d6f909 | 295 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
296 | /* |
297 | * If not matching target port group ID can be located | |
298 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST | |
299 | */ | |
05d1c7c0 AG |
300 | if (rc != 0) { |
301 | rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
302 | goto out; | |
303 | } | |
c66ac9db NB |
304 | } else { |
305 | /* | |
306 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
307 | * the Target Port in question for the the incoming | |
308 | * SET_TARGET_PORT_GROUPS op. | |
309 | */ | |
310 | rtpi = ((ptr[2] << 8) & 0xff); | |
311 | rtpi |= (ptr[3] & 0xff); | |
312 | /* | |
313 | * Locate the matching relative target port identifer | |
314 | * for the struct se_device storage object. | |
315 | */ | |
316 | spin_lock(&dev->se_port_lock); | |
317 | list_for_each_entry(port, &dev->dev_sep_list, | |
318 | sep_list) { | |
319 | if (port->sep_rtpi != rtpi) | |
320 | continue; | |
321 | ||
322 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
323 | spin_unlock(&dev->se_port_lock); | |
324 | ||
325 | rc = core_alua_set_tg_pt_secondary_state( | |
326 | tg_pt_gp_mem, port, 1, 1); | |
327 | ||
328 | spin_lock(&dev->se_port_lock); | |
329 | break; | |
330 | } | |
331 | spin_unlock(&dev->se_port_lock); | |
332 | /* | |
333 | * If not matching relative target port identifier can | |
334 | * be located, throw an exception with ASCQ: | |
335 | * INVALID_PARAMETER_LIST | |
336 | */ | |
05d1c7c0 AG |
337 | if (rc != 0) { |
338 | rc = PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
339 | goto out; | |
340 | } | |
c66ac9db NB |
341 | } |
342 | ||
343 | ptr += 4; | |
344 | len += 4; | |
345 | } | |
346 | ||
05d1c7c0 AG |
347 | out: |
348 | transport_kunmap_first_data_page(cmd); | |
d29a5b6a CH |
349 | task->task_scsi_status = GOOD; |
350 | transport_complete_task(task, 1); | |
c66ac9db NB |
351 | return 0; |
352 | } | |
353 | ||
354 | static inline int core_alua_state_nonoptimized( | |
355 | struct se_cmd *cmd, | |
356 | unsigned char *cdb, | |
357 | int nonop_delay_msecs, | |
358 | u8 *alua_ascq) | |
359 | { | |
360 | /* | |
361 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
362 | * later to determine if processing of this cmd needs to be | |
363 | * temporarily delayed for the Active/NonOptimized primary access state. | |
364 | */ | |
365 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
366 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static inline int core_alua_state_standby( | |
371 | struct se_cmd *cmd, | |
372 | unsigned char *cdb, | |
373 | u8 *alua_ascq) | |
374 | { | |
375 | /* | |
376 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
377 | * spc4r17 section 5.9.2.4.4 | |
378 | */ | |
379 | switch (cdb[0]) { | |
380 | case INQUIRY: | |
381 | case LOG_SELECT: | |
382 | case LOG_SENSE: | |
383 | case MODE_SELECT: | |
384 | case MODE_SENSE: | |
385 | case REPORT_LUNS: | |
386 | case RECEIVE_DIAGNOSTIC: | |
387 | case SEND_DIAGNOSTIC: | |
388 | case MAINTENANCE_IN: | |
389 | switch (cdb[1]) { | |
390 | case MI_REPORT_TARGET_PGS: | |
391 | return 0; | |
392 | default: | |
393 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
394 | return 1; | |
395 | } | |
396 | case MAINTENANCE_OUT: | |
397 | switch (cdb[1]) { | |
398 | case MO_SET_TARGET_PGS: | |
399 | return 0; | |
400 | default: | |
401 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
402 | return 1; | |
403 | } | |
404 | case REQUEST_SENSE: | |
405 | case PERSISTENT_RESERVE_IN: | |
406 | case PERSISTENT_RESERVE_OUT: | |
407 | case READ_BUFFER: | |
408 | case WRITE_BUFFER: | |
409 | return 0; | |
410 | default: | |
411 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
412 | return 1; | |
413 | } | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | static inline int core_alua_state_unavailable( | |
419 | struct se_cmd *cmd, | |
420 | unsigned char *cdb, | |
421 | u8 *alua_ascq) | |
422 | { | |
423 | /* | |
424 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
425 | * spc4r17 section 5.9.2.4.5 | |
426 | */ | |
427 | switch (cdb[0]) { | |
428 | case INQUIRY: | |
429 | case REPORT_LUNS: | |
430 | case MAINTENANCE_IN: | |
431 | switch (cdb[1]) { | |
432 | case MI_REPORT_TARGET_PGS: | |
433 | return 0; | |
434 | default: | |
435 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
436 | return 1; | |
437 | } | |
438 | case MAINTENANCE_OUT: | |
439 | switch (cdb[1]) { | |
440 | case MO_SET_TARGET_PGS: | |
441 | return 0; | |
442 | default: | |
443 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
444 | return 1; | |
445 | } | |
446 | case REQUEST_SENSE: | |
447 | case READ_BUFFER: | |
448 | case WRITE_BUFFER: | |
449 | return 0; | |
450 | default: | |
451 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
452 | return 1; | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | static inline int core_alua_state_transition( | |
459 | struct se_cmd *cmd, | |
460 | unsigned char *cdb, | |
461 | u8 *alua_ascq) | |
462 | { | |
463 | /* | |
464 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
465 | * spc4r17 section 5.9.2.5 | |
466 | */ | |
467 | switch (cdb[0]) { | |
468 | case INQUIRY: | |
469 | case REPORT_LUNS: | |
470 | case MAINTENANCE_IN: | |
471 | switch (cdb[1]) { | |
472 | case MI_REPORT_TARGET_PGS: | |
473 | return 0; | |
474 | default: | |
475 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
476 | return 1; | |
477 | } | |
478 | case REQUEST_SENSE: | |
479 | case READ_BUFFER: | |
480 | case WRITE_BUFFER: | |
481 | return 0; | |
482 | default: | |
483 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
484 | return 1; | |
485 | } | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | /* | |
491 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED | |
492 | * in transport_cmd_sequencer(). This function is assigned to | |
493 | * struct t10_alua *->state_check() in core_setup_alua() | |
494 | */ | |
495 | static int core_alua_state_check_nop( | |
496 | struct se_cmd *cmd, | |
497 | unsigned char *cdb, | |
498 | u8 *alua_ascq) | |
499 | { | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). | |
505 | * This function is assigned to struct t10_alua *->state_check() in | |
506 | * core_setup_alua() | |
507 | * | |
508 | * Also, this function can return three different return codes to | |
509 | * signal transport_generic_cmd_sequencer() | |
510 | * | |
511 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready | |
512 | * return 0: Used to signal success | |
513 | * reutrn -1: Used to signal failure, and invalid cdb field | |
514 | */ | |
515 | static int core_alua_state_check( | |
516 | struct se_cmd *cmd, | |
517 | unsigned char *cdb, | |
518 | u8 *alua_ascq) | |
519 | { | |
e3d6f909 | 520 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
521 | struct se_port *port = lun->lun_sep; |
522 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
523 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
524 | int out_alua_state, nonop_delay_msecs; | |
525 | ||
6708bb27 | 526 | if (!port) |
c66ac9db NB |
527 | return 0; |
528 | /* | |
529 | * First, check for a struct se_port specific secondary ALUA target port | |
530 | * access state: OFFLINE | |
531 | */ | |
532 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
533 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
6708bb27 | 534 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db NB |
535 | " target port\n"); |
536 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
537 | return 1; | |
538 | } | |
539 | /* | |
540 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
541 | * ALUA target port group, to obtain current ALUA access state. | |
542 | * Otherwise look for the underlying struct se_device association with | |
543 | * a ALUA logical unit group. | |
544 | */ | |
545 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
546 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
547 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
548 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
549 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
550 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
551 | /* | |
25985edc LDM |
552 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
553 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
554 | * For the Optimized ALUA access state case, we want to process the |
555 | * incoming fabric cmd ASAP.. | |
556 | */ | |
557 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
558 | return 0; | |
559 | ||
560 | switch (out_alua_state) { | |
561 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
562 | return core_alua_state_nonoptimized(cmd, cdb, | |
563 | nonop_delay_msecs, alua_ascq); | |
564 | case ALUA_ACCESS_STATE_STANDBY: | |
565 | return core_alua_state_standby(cmd, cdb, alua_ascq); | |
566 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
567 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); | |
568 | case ALUA_ACCESS_STATE_TRANSITION: | |
569 | return core_alua_state_transition(cmd, cdb, alua_ascq); | |
570 | /* | |
571 | * OFFLINE is a secondary ALUA target port group access state, that is | |
572 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
573 | */ | |
574 | case ALUA_ACCESS_STATE_OFFLINE: | |
575 | default: | |
6708bb27 | 576 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 577 | out_alua_state); |
e3d6f909 | 578 | return -EINVAL; |
c66ac9db NB |
579 | } |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Check implict and explict ALUA state change request. | |
586 | */ | |
587 | static int core_alua_check_transition(int state, int *primary) | |
588 | { | |
589 | switch (state) { | |
590 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
591 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
592 | case ALUA_ACCESS_STATE_STANDBY: | |
593 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
594 | /* | |
595 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
596 | * defined as primary target port asymmetric access states. | |
597 | */ | |
598 | *primary = 1; | |
599 | break; | |
600 | case ALUA_ACCESS_STATE_OFFLINE: | |
601 | /* | |
602 | * OFFLINE state is defined as a secondary target port | |
603 | * asymmetric access state. | |
604 | */ | |
605 | *primary = 0; | |
606 | break; | |
607 | default: | |
6708bb27 | 608 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
e3d6f909 | 609 | return -EINVAL; |
c66ac9db NB |
610 | } |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | static char *core_alua_dump_state(int state) | |
616 | { | |
617 | switch (state) { | |
618 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
619 | return "Active/Optimized"; | |
620 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
621 | return "Active/NonOptimized"; | |
622 | case ALUA_ACCESS_STATE_STANDBY: | |
623 | return "Standby"; | |
624 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
625 | return "Unavailable"; | |
626 | case ALUA_ACCESS_STATE_OFFLINE: | |
627 | return "Offline"; | |
628 | default: | |
629 | return "Unknown"; | |
630 | } | |
631 | ||
632 | return NULL; | |
633 | } | |
634 | ||
635 | char *core_alua_dump_status(int status) | |
636 | { | |
637 | switch (status) { | |
638 | case ALUA_STATUS_NONE: | |
639 | return "None"; | |
640 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
641 | return "Altered by Explict STPG"; | |
642 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
643 | return "Altered by Implict ALUA"; | |
644 | default: | |
645 | return "Unknown"; | |
646 | } | |
647 | ||
648 | return NULL; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Used by fabric modules to determine when we need to delay processing | |
653 | * for the Active/NonOptimized paths.. | |
654 | */ | |
655 | int core_alua_check_nonop_delay( | |
656 | struct se_cmd *cmd) | |
657 | { | |
658 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
659 | return 0; | |
660 | if (in_interrupt()) | |
661 | return 0; | |
662 | /* | |
663 | * The ALUA Active/NonOptimized access state delay can be disabled | |
664 | * in via configfs with a value of zero | |
665 | */ | |
6708bb27 | 666 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
667 | return 0; |
668 | /* | |
669 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
670 | * defined interval in core_alua_state_nonoptimized() | |
671 | */ | |
672 | msleep_interruptible(cmd->alua_nonop_delay); | |
673 | return 0; | |
674 | } | |
675 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
676 | ||
677 | /* | |
678 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
679 | * | |
680 | */ | |
681 | static int core_alua_write_tpg_metadata( | |
682 | const char *path, | |
683 | unsigned char *md_buf, | |
684 | u32 md_buf_len) | |
685 | { | |
686 | mm_segment_t old_fs; | |
687 | struct file *file; | |
688 | struct iovec iov[1]; | |
689 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; | |
690 | ||
691 | memset(iov, 0, sizeof(struct iovec)); | |
692 | ||
693 | file = filp_open(path, flags, 0600); | |
694 | if (IS_ERR(file) || !file || !file->f_dentry) { | |
6708bb27 | 695 | pr_err("filp_open(%s) for ALUA metadata failed\n", |
c66ac9db NB |
696 | path); |
697 | return -ENODEV; | |
698 | } | |
699 | ||
700 | iov[0].iov_base = &md_buf[0]; | |
701 | iov[0].iov_len = md_buf_len; | |
702 | ||
703 | old_fs = get_fs(); | |
704 | set_fs(get_ds()); | |
705 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); | |
706 | set_fs(old_fs); | |
707 | ||
708 | if (ret < 0) { | |
6708bb27 | 709 | pr_err("Error writing ALUA metadata file: %s\n", path); |
c66ac9db NB |
710 | filp_close(file, NULL); |
711 | return -EIO; | |
712 | } | |
713 | filp_close(file, NULL); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
720 | */ | |
721 | static int core_alua_update_tpg_primary_metadata( | |
722 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
723 | int primary_state, | |
724 | unsigned char *md_buf) | |
725 | { | |
726 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
727 | struct t10_wwn *wwn = &su_dev->t10_wwn; | |
728 | char path[ALUA_METADATA_PATH_LEN]; | |
729 | int len; | |
730 | ||
731 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
732 | ||
733 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
734 | "tg_pt_gp_id=%hu\n" | |
735 | "alua_access_state=0x%02x\n" | |
736 | "alua_access_status=0x%02x\n", | |
737 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
738 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
739 | ||
740 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
741 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
742 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
743 | ||
744 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
745 | } | |
746 | ||
747 | static int core_alua_do_transition_tg_pt( | |
748 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
749 | struct se_port *l_port, | |
750 | struct se_node_acl *nacl, | |
751 | unsigned char *md_buf, | |
752 | int new_state, | |
753 | int explict) | |
754 | { | |
755 | struct se_dev_entry *se_deve; | |
756 | struct se_lun_acl *lacl; | |
757 | struct se_port *port; | |
758 | struct t10_alua_tg_pt_gp_member *mem; | |
759 | int old_state = 0; | |
760 | /* | |
761 | * Save the old primary ALUA access state, and set the current state | |
762 | * to ALUA_ACCESS_STATE_TRANSITION. | |
763 | */ | |
764 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
765 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
766 | ALUA_ACCESS_STATE_TRANSITION); | |
767 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
768 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
769 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
770 | /* | |
771 | * Check for the optional ALUA primary state transition delay | |
772 | */ | |
773 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
774 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
775 | ||
776 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
777 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
778 | tg_pt_gp_mem_list) { | |
779 | port = mem->tg_pt; | |
780 | /* | |
781 | * After an implicit target port asymmetric access state | |
782 | * change, a device server shall establish a unit attention | |
783 | * condition for the initiator port associated with every I_T | |
784 | * nexus with the additional sense code set to ASYMMETRIC | |
785 | * ACCESS STATE CHAGED. | |
786 | * | |
787 | * After an explicit target port asymmetric access state | |
788 | * change, a device server shall establish a unit attention | |
789 | * condition with the additional sense code set to ASYMMETRIC | |
790 | * ACCESS STATE CHANGED for the initiator port associated with | |
791 | * every I_T nexus other than the I_T nexus on which the SET | |
792 | * TARGET PORT GROUPS command | |
793 | */ | |
794 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
795 | smp_mb__after_atomic_inc(); | |
796 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
797 | ||
798 | spin_lock_bh(&port->sep_alua_lock); | |
799 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
800 | alua_port_list) { | |
801 | lacl = se_deve->se_lun_acl; | |
802 | /* | |
803 | * se_deve->se_lun_acl pointer may be NULL for a | |
804 | * entry created without explict Node+MappedLUN ACLs | |
805 | */ | |
6708bb27 | 806 | if (!lacl) |
c66ac9db NB |
807 | continue; |
808 | ||
809 | if (explict && | |
810 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
811 | (l_port != NULL) && (l_port == port)) | |
812 | continue; | |
813 | ||
814 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
815 | se_deve->mapped_lun, 0x2A, | |
816 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
817 | } | |
818 | spin_unlock_bh(&port->sep_alua_lock); | |
819 | ||
820 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
821 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
822 | smp_mb__after_atomic_dec(); | |
823 | } | |
824 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
825 | /* | |
826 | * Update the ALUA metadata buf that has been allocated in | |
827 | * core_alua_do_port_transition(), this metadata will be written | |
828 | * to struct file. | |
829 | * | |
830 | * Note that there is the case where we do not want to update the | |
831 | * metadata when the saved metadata is being parsed in userspace | |
832 | * when setting the existing port access state and access status. | |
833 | * | |
834 | * Also note that the failure to write out the ALUA metadata to | |
835 | * struct file does NOT affect the actual ALUA transition. | |
836 | */ | |
837 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
838 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
839 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
840 | new_state, md_buf); | |
841 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
842 | } | |
843 | /* | |
844 | * Set the current primary ALUA access state to the requested new state | |
845 | */ | |
846 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
847 | ||
6708bb27 | 848 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
849 | " from primary access state %s to %s\n", (explict) ? "explict" : |
850 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
851 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
852 | core_alua_dump_state(new_state)); | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | int core_alua_do_port_transition( | |
858 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
859 | struct se_device *l_dev, | |
860 | struct se_port *l_port, | |
861 | struct se_node_acl *l_nacl, | |
862 | int new_state, | |
863 | int explict) | |
864 | { | |
865 | struct se_device *dev; | |
866 | struct se_port *port; | |
867 | struct se_subsystem_dev *su_dev; | |
868 | struct se_node_acl *nacl; | |
869 | struct t10_alua_lu_gp *lu_gp; | |
870 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
871 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
872 | unsigned char *md_buf; | |
873 | int primary; | |
874 | ||
875 | if (core_alua_check_transition(new_state, &primary) != 0) | |
876 | return -EINVAL; | |
877 | ||
878 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
879 | if (!md_buf) { |
880 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
881 | return -ENOMEM; |
882 | } | |
883 | ||
884 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
885 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
886 | lu_gp = local_lu_gp_mem->lu_gp; | |
887 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
888 | smp_mb__after_atomic_inc(); | |
889 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
890 | /* | |
891 | * For storage objects that are members of the 'default_lu_gp', | |
892 | * we only do transition on the passed *l_tp_pt_gp, and not | |
893 | * on all of the matching target port groups IDs in default_lu_gp. | |
894 | */ | |
6708bb27 | 895 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
896 | /* |
897 | * core_alua_do_transition_tg_pt() will always return | |
898 | * success. | |
899 | */ | |
900 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
901 | md_buf, new_state, explict); | |
902 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
903 | smp_mb__after_atomic_dec(); | |
904 | kfree(md_buf); | |
905 | return 0; | |
906 | } | |
907 | /* | |
908 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
909 | * the associated storage objects looking for a matching target port | |
910 | * group ID from the local target port group. | |
911 | */ | |
912 | spin_lock(&lu_gp->lu_gp_lock); | |
913 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
914 | lu_gp_mem_list) { | |
915 | ||
916 | dev = lu_gp_mem->lu_gp_mem_dev; | |
917 | su_dev = dev->se_sub_dev; | |
918 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
919 | smp_mb__after_atomic_inc(); | |
920 | spin_unlock(&lu_gp->lu_gp_lock); | |
921 | ||
e3d6f909 | 922 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 923 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 924 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
925 | tg_pt_gp_list) { |
926 | ||
6708bb27 | 927 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
928 | continue; |
929 | /* | |
930 | * If the target behavior port asymmetric access state | |
931 | * is changed for any target port group accessiable via | |
932 | * a logical unit within a LU group, the target port | |
933 | * behavior group asymmetric access states for the same | |
934 | * target port group accessible via other logical units | |
935 | * in that LU group will also change. | |
936 | */ | |
937 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
938 | continue; | |
939 | ||
940 | if (l_tg_pt_gp == tg_pt_gp) { | |
941 | port = l_port; | |
942 | nacl = l_nacl; | |
943 | } else { | |
944 | port = NULL; | |
945 | nacl = NULL; | |
946 | } | |
947 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
948 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 949 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
950 | /* |
951 | * core_alua_do_transition_tg_pt() will always return | |
952 | * success. | |
953 | */ | |
954 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
955 | nacl, md_buf, new_state, explict); | |
956 | ||
e3d6f909 | 957 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
958 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
959 | smp_mb__after_atomic_dec(); | |
960 | } | |
e3d6f909 | 961 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
962 | |
963 | spin_lock(&lu_gp->lu_gp_lock); | |
964 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
965 | smp_mb__after_atomic_dec(); | |
966 | } | |
967 | spin_unlock(&lu_gp->lu_gp_lock); | |
968 | ||
6708bb27 | 969 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
970 | " Group IDs: %hu %s transition to primary state: %s\n", |
971 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
972 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
973 | core_alua_dump_state(new_state)); | |
974 | ||
975 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
976 | smp_mb__after_atomic_dec(); | |
977 | kfree(md_buf); | |
978 | return 0; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
983 | */ | |
984 | static int core_alua_update_tpg_secondary_metadata( | |
985 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
986 | struct se_port *port, | |
987 | unsigned char *md_buf, | |
988 | u32 md_buf_len) | |
989 | { | |
990 | struct se_portal_group *se_tpg = port->sep_tpg; | |
991 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
992 | int len; | |
993 | ||
994 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
995 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
996 | ||
997 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 998 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 999 | |
e3d6f909 | 1000 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 1001 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 1002 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
1003 | |
1004 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
1005 | "alua_tg_pt_status=0x%02x\n", | |
1006 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
1007 | port->sep_tg_pt_secondary_stat); | |
1008 | ||
1009 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 1010 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
1011 | port->sep_lun->unpacked_lun); |
1012 | ||
1013 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
1014 | } | |
1015 | ||
1016 | static int core_alua_set_tg_pt_secondary_state( | |
1017 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1018 | struct se_port *port, | |
1019 | int explict, | |
1020 | int offline) | |
1021 | { | |
1022 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1023 | unsigned char *md_buf; | |
1024 | u32 md_buf_len; | |
1025 | int trans_delay_msecs; | |
1026 | ||
1027 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1028 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1029 | if (!tg_pt_gp) { |
c66ac9db | 1030 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1031 | pr_err("Unable to complete secondary state" |
c66ac9db | 1032 | " transition\n"); |
e3d6f909 | 1033 | return -EINVAL; |
c66ac9db NB |
1034 | } |
1035 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1036 | /* | |
1037 | * Set the secondary ALUA target port access state to OFFLINE | |
1038 | * or release the previously secondary state for struct se_port | |
1039 | */ | |
1040 | if (offline) | |
1041 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1042 | else | |
1043 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1044 | ||
1045 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1046 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1047 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1048 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1049 | ||
6708bb27 | 1050 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1051 | " to secondary access state: %s\n", (explict) ? "explict" : |
1052 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1053 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1054 | ||
1055 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1056 | /* | |
1057 | * Do the optional transition delay after we set the secondary | |
1058 | * ALUA access state. | |
1059 | */ | |
1060 | if (trans_delay_msecs != 0) | |
1061 | msleep_interruptible(trans_delay_msecs); | |
1062 | /* | |
1063 | * See if we need to update the ALUA fabric port metadata for | |
1064 | * secondary state and status | |
1065 | */ | |
1066 | if (port->sep_tg_pt_secondary_write_md) { | |
1067 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1068 | if (!md_buf) { |
1069 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1070 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1071 | return -ENOMEM; |
c66ac9db NB |
1072 | } |
1073 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1074 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1075 | md_buf, md_buf_len); | |
1076 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1077 | ||
1078 | kfree(md_buf); | |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | struct t10_alua_lu_gp * | |
1085 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1086 | { | |
1087 | struct t10_alua_lu_gp *lu_gp; | |
1088 | ||
1089 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1090 | if (!lu_gp) { |
1091 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1092 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1093 | } |
e3d6f909 | 1094 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1095 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1096 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1097 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1098 | ||
1099 | if (def_group) { | |
e3d6f909 | 1100 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1101 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1102 | alua_lu_gps_count++; |
c66ac9db NB |
1103 | } |
1104 | ||
1105 | return lu_gp; | |
1106 | } | |
1107 | ||
1108 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1109 | { | |
1110 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1111 | u16 lu_gp_id_tmp; | |
1112 | /* | |
1113 | * The lu_gp->lu_gp_id may only be set once.. | |
1114 | */ | |
1115 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1116 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1117 | " ignoring request\n"); |
e3d6f909 | 1118 | return -EINVAL; |
c66ac9db NB |
1119 | } |
1120 | ||
e3d6f909 AG |
1121 | spin_lock(&lu_gps_lock); |
1122 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1123 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1124 | " 0x0000ffff reached\n"); |
e3d6f909 | 1125 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1126 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1127 | return -ENOSPC; |
c66ac9db NB |
1128 | } |
1129 | again: | |
1130 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1131 | alua_lu_gps_counter++; |
c66ac9db | 1132 | |
e3d6f909 | 1133 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1134 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1135 | if (!lu_gp_id) |
c66ac9db NB |
1136 | goto again; |
1137 | ||
6708bb27 | 1138 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1139 | " already exists, ignoring request\n", |
1140 | lu_gp_id); | |
e3d6f909 AG |
1141 | spin_unlock(&lu_gps_lock); |
1142 | return -EINVAL; | |
c66ac9db NB |
1143 | } |
1144 | } | |
1145 | ||
1146 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1147 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1148 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1149 | alua_lu_gps_count++; | |
1150 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1151 | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | static struct t10_alua_lu_gp_member * | |
1156 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1157 | { | |
1158 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1159 | ||
1160 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1161 | if (!lu_gp_mem) { |
1162 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1163 | return ERR_PTR(-ENOMEM); |
1164 | } | |
1165 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1166 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1167 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1168 | ||
1169 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1170 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1171 | ||
1172 | return lu_gp_mem; | |
1173 | } | |
1174 | ||
1175 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1176 | { | |
1177 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1178 | /* | |
1179 | * Once we have reached this point, config_item_put() has | |
1180 | * already been called from target_core_alua_drop_lu_gp(). | |
1181 | * | |
1182 | * Here, we remove the *lu_gp from the global list so that | |
1183 | * no associations can be made while we are releasing | |
1184 | * struct t10_alua_lu_gp. | |
1185 | */ | |
e3d6f909 | 1186 | spin_lock(&lu_gps_lock); |
c66ac9db | 1187 | atomic_set(&lu_gp->lu_gp_shutdown, 1); |
e3d6f909 AG |
1188 | list_del(&lu_gp->lu_gp_node); |
1189 | alua_lu_gps_count--; | |
1190 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1191 | /* |
1192 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1193 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1194 | * released with core_alua_put_lu_gp_from_name() | |
1195 | */ | |
1196 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1197 | cpu_relax(); | |
1198 | /* | |
1199 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1200 | * struct se_device. | |
1201 | */ | |
1202 | spin_lock(&lu_gp->lu_gp_lock); | |
1203 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1204 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1205 | if (lu_gp_mem->lu_gp_assoc) { | |
1206 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1207 | lu_gp->lu_gp_members--; | |
1208 | lu_gp_mem->lu_gp_assoc = 0; | |
1209 | } | |
1210 | spin_unlock(&lu_gp->lu_gp_lock); | |
1211 | /* | |
1212 | * | |
25985edc | 1213 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1214 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1215 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1216 | * | |
1217 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1218 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1219 | */ | |
1220 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1221 | if (lu_gp != default_lu_gp) |
c66ac9db | 1222 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1223 | default_lu_gp); |
c66ac9db NB |
1224 | else |
1225 | lu_gp_mem->lu_gp = NULL; | |
1226 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1227 | ||
1228 | spin_lock(&lu_gp->lu_gp_lock); | |
1229 | } | |
1230 | spin_unlock(&lu_gp->lu_gp_lock); | |
1231 | ||
1232 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1233 | } | |
1234 | ||
1235 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1236 | { | |
1237 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1238 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1239 | struct t10_alua_lu_gp *lu_gp; |
1240 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1241 | ||
1242 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1243 | return; | |
1244 | ||
1245 | lu_gp_mem = dev->dev_alua_lu_gp_mem; | |
6708bb27 | 1246 | if (!lu_gp_mem) |
c66ac9db NB |
1247 | return; |
1248 | ||
1249 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1250 | cpu_relax(); | |
1251 | ||
1252 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1253 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1254 | if (lu_gp) { |
c66ac9db NB |
1255 | spin_lock(&lu_gp->lu_gp_lock); |
1256 | if (lu_gp_mem->lu_gp_assoc) { | |
1257 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1258 | lu_gp->lu_gp_members--; | |
1259 | lu_gp_mem->lu_gp_assoc = 0; | |
1260 | } | |
1261 | spin_unlock(&lu_gp->lu_gp_lock); | |
1262 | lu_gp_mem->lu_gp = NULL; | |
1263 | } | |
1264 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1265 | ||
1266 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1267 | } | |
1268 | ||
1269 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1270 | { | |
1271 | struct t10_alua_lu_gp *lu_gp; | |
1272 | struct config_item *ci; | |
1273 | ||
e3d6f909 AG |
1274 | spin_lock(&lu_gps_lock); |
1275 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1276 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1277 | continue; |
1278 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1279 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1280 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1281 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1282 | return lu_gp; |
1283 | } | |
1284 | } | |
e3d6f909 | 1285 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1286 | |
1287 | return NULL; | |
1288 | } | |
1289 | ||
1290 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1291 | { | |
e3d6f909 | 1292 | spin_lock(&lu_gps_lock); |
c66ac9db | 1293 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1294 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1295 | } |
1296 | ||
1297 | /* | |
1298 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1299 | */ | |
1300 | void __core_alua_attach_lu_gp_mem( | |
1301 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1302 | struct t10_alua_lu_gp *lu_gp) | |
1303 | { | |
1304 | spin_lock(&lu_gp->lu_gp_lock); | |
1305 | lu_gp_mem->lu_gp = lu_gp; | |
1306 | lu_gp_mem->lu_gp_assoc = 1; | |
1307 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1308 | lu_gp->lu_gp_members++; | |
1309 | spin_unlock(&lu_gp->lu_gp_lock); | |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1314 | */ | |
1315 | void __core_alua_drop_lu_gp_mem( | |
1316 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1317 | struct t10_alua_lu_gp *lu_gp) | |
1318 | { | |
1319 | spin_lock(&lu_gp->lu_gp_lock); | |
1320 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1321 | lu_gp_mem->lu_gp = NULL; | |
1322 | lu_gp_mem->lu_gp_assoc = 0; | |
1323 | lu_gp->lu_gp_members--; | |
1324 | spin_unlock(&lu_gp->lu_gp_lock); | |
1325 | } | |
1326 | ||
1327 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( | |
1328 | struct se_subsystem_dev *su_dev, | |
1329 | const char *name, | |
1330 | int def_group) | |
1331 | { | |
1332 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1333 | ||
1334 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1335 | if (!tg_pt_gp) { |
1336 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1337 | return NULL; |
1338 | } | |
1339 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1340 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1341 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1342 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1343 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
1344 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; | |
1345 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; | |
1346 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1347 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1348 | /* | |
1349 | * Enable both explict and implict ALUA support by default | |
1350 | */ | |
1351 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1352 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1353 | /* | |
1354 | * Set the default Active/NonOptimized Delay in milliseconds | |
1355 | */ | |
1356 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1357 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
1358 | ||
1359 | if (def_group) { | |
e3d6f909 | 1360 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1361 | tg_pt_gp->tg_pt_gp_id = |
e3d6f909 | 1362 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1363 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
e3d6f909 | 1364 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1365 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
e3d6f909 AG |
1366 | &su_dev->t10_alua.tg_pt_gps_list); |
1367 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1368 | } |
1369 | ||
1370 | return tg_pt_gp; | |
1371 | } | |
1372 | ||
1373 | int core_alua_set_tg_pt_gp_id( | |
1374 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1375 | u16 tg_pt_gp_id) | |
1376 | { | |
1377 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1378 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; | |
1379 | u16 tg_pt_gp_id_tmp; | |
1380 | /* | |
1381 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1382 | */ | |
1383 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1384 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1385 | " ignoring request\n"); |
e3d6f909 | 1386 | return -EINVAL; |
c66ac9db NB |
1387 | } |
1388 | ||
e3d6f909 AG |
1389 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1390 | if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1391 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1392 | " 0x0000ffff reached\n"); |
e3d6f909 | 1393 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1394 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1395 | return -ENOSPC; |
c66ac9db NB |
1396 | } |
1397 | again: | |
1398 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
e3d6f909 | 1399 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1400 | |
e3d6f909 | 1401 | list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1402 | tg_pt_gp_list) { |
1403 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1404 | if (!tg_pt_gp_id) |
c66ac9db NB |
1405 | goto again; |
1406 | ||
6708bb27 | 1407 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1408 | " exists, ignoring request\n", tg_pt_gp_id); |
e3d6f909 AG |
1409 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
1410 | return -EINVAL; | |
c66ac9db NB |
1411 | } |
1412 | } | |
1413 | ||
1414 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1415 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1416 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
e3d6f909 AG |
1417 | &su_dev->t10_alua.tg_pt_gps_list); |
1418 | su_dev->t10_alua.alua_tg_pt_gps_count++; | |
1419 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1420 | |
1421 | return 0; | |
1422 | } | |
1423 | ||
1424 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1425 | struct se_port *port) | |
1426 | { | |
1427 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1428 | ||
1429 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1430 | GFP_KERNEL); | |
6708bb27 AG |
1431 | if (!tg_pt_gp_mem) { |
1432 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1433 | return ERR_PTR(-ENOMEM); |
1434 | } | |
1435 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1436 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1437 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1438 | ||
1439 | tg_pt_gp_mem->tg_pt = port; | |
1440 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
1441 | atomic_set(&port->sep_tg_pt_gp_active, 1); | |
1442 | ||
1443 | return tg_pt_gp_mem; | |
1444 | } | |
1445 | ||
1446 | void core_alua_free_tg_pt_gp( | |
1447 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1448 | { | |
1449 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1450 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; | |
1451 | /* | |
1452 | * Once we have reached this point, config_item_put() has already | |
1453 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1454 | * | |
1455 | * Here we remove *tg_pt_gp from the global list so that | |
1456 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1457 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1458 | */ | |
e3d6f909 | 1459 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1460 | list_del(&tg_pt_gp->tg_pt_gp_list); |
e3d6f909 AG |
1461 | su_dev->t10_alua.alua_tg_pt_gps_counter--; |
1462 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1463 | /* |
1464 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1465 | * core_alua_get_tg_pt_gp_by_name() in | |
1466 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1467 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1468 | */ | |
1469 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1470 | cpu_relax(); | |
1471 | /* | |
1472 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1473 | * struct se_port. | |
1474 | */ | |
1475 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1476 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1477 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1478 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1479 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1480 | tg_pt_gp->tg_pt_gp_members--; | |
1481 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1482 | } | |
1483 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1484 | /* | |
25985edc | 1485 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1486 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1487 | * core_alua_free_tg_pt_gp_mem(). | |
1488 | * | |
1489 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1490 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1491 | * default_tg_pt_gp. | |
1492 | */ | |
1493 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
e3d6f909 | 1494 | if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1495 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
e3d6f909 | 1496 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1497 | } else |
1498 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1499 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1500 | ||
1501 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1502 | } | |
1503 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1504 | ||
1505 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1506 | } | |
1507 | ||
1508 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1509 | { | |
1510 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
e3d6f909 | 1511 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1512 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1513 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1514 | ||
1515 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1516 | return; | |
1517 | ||
1518 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1519 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1520 | return; |
1521 | ||
1522 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1523 | cpu_relax(); | |
1524 | ||
1525 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1526 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1527 | if (tg_pt_gp) { |
c66ac9db NB |
1528 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1529 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1530 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1531 | tg_pt_gp->tg_pt_gp_members--; | |
1532 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1533 | } | |
1534 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1535 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1536 | } | |
1537 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1538 | ||
1539 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1540 | } | |
1541 | ||
1542 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
1543 | struct se_subsystem_dev *su_dev, | |
1544 | const char *name) | |
1545 | { | |
1546 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1547 | struct config_item *ci; | |
1548 | ||
e3d6f909 AG |
1549 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1550 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1551 | tg_pt_gp_list) { |
6708bb27 | 1552 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1553 | continue; |
1554 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1555 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1556 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1557 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1558 | return tg_pt_gp; |
1559 | } | |
1560 | } | |
e3d6f909 | 1561 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1562 | |
1563 | return NULL; | |
1564 | } | |
1565 | ||
1566 | static void core_alua_put_tg_pt_gp_from_name( | |
1567 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1568 | { | |
1569 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1570 | ||
e3d6f909 | 1571 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1572 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1573 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1574 | } |
1575 | ||
1576 | /* | |
1577 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1578 | */ | |
1579 | void __core_alua_attach_tg_pt_gp_mem( | |
1580 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1581 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1582 | { | |
1583 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1584 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1585 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1586 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1587 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1588 | tg_pt_gp->tg_pt_gp_members++; | |
1589 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1594 | */ | |
1595 | static void __core_alua_drop_tg_pt_gp_mem( | |
1596 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1597 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1598 | { | |
1599 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1600 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1601 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1602 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1603 | tg_pt_gp->tg_pt_gp_members--; | |
1604 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1605 | } | |
1606 | ||
1607 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1608 | { | |
1609 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1610 | struct config_item *tg_pt_ci; | |
e3d6f909 | 1611 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1612 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1613 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1614 | ssize_t len = 0; | |
1615 | ||
1616 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1617 | return len; | |
1618 | ||
1619 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1620 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1621 | return len; |
1622 | ||
1623 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1624 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1625 | if (tg_pt_gp) { |
c66ac9db NB |
1626 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1627 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1628 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1629 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1630 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1631 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1632 | core_alua_dump_state(atomic_read( | |
1633 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1634 | core_alua_dump_status( | |
1635 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1636 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1637 | "Offline" : "None", | |
1638 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1639 | } | |
1640 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1641 | ||
1642 | return len; | |
1643 | } | |
1644 | ||
1645 | ssize_t core_alua_store_tg_pt_gp_info( | |
1646 | struct se_port *port, | |
1647 | const char *page, | |
1648 | size_t count) | |
1649 | { | |
1650 | struct se_portal_group *tpg; | |
1651 | struct se_lun *lun; | |
1652 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1653 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; | |
1654 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1655 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1656 | int move = 0; | |
1657 | ||
1658 | tpg = port->sep_tpg; | |
1659 | lun = port->sep_lun; | |
1660 | ||
e3d6f909 | 1661 | if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) { |
6708bb27 | 1662 | pr_warn("SPC3_ALUA_EMULATED not enabled for" |
e3d6f909 AG |
1663 | " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1664 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1665 | config_item_name(&lun->lun_group.cg_item)); |
1666 | return -EINVAL; | |
1667 | } | |
1668 | ||
1669 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1670 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1671 | return -EINVAL; |
1672 | } | |
1673 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1674 | memcpy(buf, page, count); | |
1675 | /* | |
1676 | * Any ALUA target port group alias besides "NULL" means we will be | |
1677 | * making a new group association. | |
1678 | */ | |
1679 | if (strcmp(strstrip(buf), "NULL")) { | |
1680 | /* | |
1681 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1682 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1683 | * core_alua_put_tg_pt_gp_from_name() below. | |
1684 | */ | |
1685 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, | |
1686 | strstrip(buf)); | |
6708bb27 | 1687 | if (!tg_pt_gp_new) |
c66ac9db NB |
1688 | return -ENODEV; |
1689 | } | |
1690 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1691 | if (!tg_pt_gp_mem) { |
c66ac9db NB |
1692 | if (tg_pt_gp_new) |
1693 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
6708bb27 | 1694 | pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
c66ac9db NB |
1695 | return -EINVAL; |
1696 | } | |
1697 | ||
1698 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1699 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1700 | if (tg_pt_gp) { |
c66ac9db NB |
1701 | /* |
1702 | * Clearing an existing tg_pt_gp association, and replacing | |
1703 | * with the default_tg_pt_gp. | |
1704 | */ | |
6708bb27 AG |
1705 | if (!tg_pt_gp_new) { |
1706 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1707 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1708 | " alua/%s, ID: %hu back to" | |
1709 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1710 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1711 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1712 | config_item_name(&lun->lun_group.cg_item), |
1713 | config_item_name( | |
1714 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1715 | tg_pt_gp->tg_pt_gp_id); | |
1716 | ||
1717 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1718 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
e3d6f909 | 1719 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1720 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1721 | ||
1722 | return count; | |
1723 | } | |
1724 | /* | |
1725 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1726 | */ | |
1727 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1728 | move = 1; | |
1729 | } | |
1730 | /* | |
1731 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1732 | */ | |
1733 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1734 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1735 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1736 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1737 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1738 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1739 | config_item_name(&lun->lun_group.cg_item), |
1740 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1741 | tg_pt_gp_new->tg_pt_gp_id); | |
1742 | ||
1743 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1744 | return count; | |
1745 | } | |
1746 | ||
1747 | ssize_t core_alua_show_access_type( | |
1748 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1749 | char *page) | |
1750 | { | |
1751 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1752 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1753 | return sprintf(page, "Implict and Explict\n"); | |
1754 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1755 | return sprintf(page, "Implict\n"); | |
1756 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1757 | return sprintf(page, "Explict\n"); | |
1758 | else | |
1759 | return sprintf(page, "None\n"); | |
1760 | } | |
1761 | ||
1762 | ssize_t core_alua_store_access_type( | |
1763 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1764 | const char *page, | |
1765 | size_t count) | |
1766 | { | |
1767 | unsigned long tmp; | |
1768 | int ret; | |
1769 | ||
1770 | ret = strict_strtoul(page, 0, &tmp); | |
1771 | if (ret < 0) { | |
6708bb27 | 1772 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1773 | return -EINVAL; |
1774 | } | |
1775 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1776 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1777 | " %lu\n", tmp); |
1778 | return -EINVAL; | |
1779 | } | |
1780 | if (tmp == 3) | |
1781 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1782 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1783 | else if (tmp == 2) | |
1784 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1785 | else if (tmp == 1) | |
1786 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1787 | else | |
1788 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1789 | ||
1790 | return count; | |
1791 | } | |
1792 | ||
1793 | ssize_t core_alua_show_nonop_delay_msecs( | |
1794 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1795 | char *page) | |
1796 | { | |
1797 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1798 | } | |
1799 | ||
1800 | ssize_t core_alua_store_nonop_delay_msecs( | |
1801 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1802 | const char *page, | |
1803 | size_t count) | |
1804 | { | |
1805 | unsigned long tmp; | |
1806 | int ret; | |
1807 | ||
1808 | ret = strict_strtoul(page, 0, &tmp); | |
1809 | if (ret < 0) { | |
6708bb27 | 1810 | pr_err("Unable to extract nonop_delay_msecs\n"); |
c66ac9db NB |
1811 | return -EINVAL; |
1812 | } | |
1813 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1814 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1815 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1816 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1817 | return -EINVAL; | |
1818 | } | |
1819 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1820 | ||
1821 | return count; | |
1822 | } | |
1823 | ||
1824 | ssize_t core_alua_show_trans_delay_msecs( | |
1825 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1826 | char *page) | |
1827 | { | |
1828 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
1829 | } | |
1830 | ||
1831 | ssize_t core_alua_store_trans_delay_msecs( | |
1832 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1833 | const char *page, | |
1834 | size_t count) | |
1835 | { | |
1836 | unsigned long tmp; | |
1837 | int ret; | |
1838 | ||
1839 | ret = strict_strtoul(page, 0, &tmp); | |
1840 | if (ret < 0) { | |
6708bb27 | 1841 | pr_err("Unable to extract trans_delay_msecs\n"); |
c66ac9db NB |
1842 | return -EINVAL; |
1843 | } | |
1844 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1845 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1846 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1847 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1848 | return -EINVAL; | |
1849 | } | |
1850 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1851 | ||
1852 | return count; | |
1853 | } | |
1854 | ||
1855 | ssize_t core_alua_show_preferred_bit( | |
1856 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1857 | char *page) | |
1858 | { | |
1859 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1860 | } | |
1861 | ||
1862 | ssize_t core_alua_store_preferred_bit( | |
1863 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1864 | const char *page, | |
1865 | size_t count) | |
1866 | { | |
1867 | unsigned long tmp; | |
1868 | int ret; | |
1869 | ||
1870 | ret = strict_strtoul(page, 0, &tmp); | |
1871 | if (ret < 0) { | |
6708bb27 | 1872 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1873 | return -EINVAL; |
1874 | } | |
1875 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1876 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1877 | return -EINVAL; |
1878 | } | |
1879 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1880 | ||
1881 | return count; | |
1882 | } | |
1883 | ||
1884 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1885 | { | |
6708bb27 | 1886 | if (!lun->lun_sep) |
c66ac9db NB |
1887 | return -ENODEV; |
1888 | ||
1889 | return sprintf(page, "%d\n", | |
1890 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1891 | } | |
1892 | ||
1893 | ssize_t core_alua_store_offline_bit( | |
1894 | struct se_lun *lun, | |
1895 | const char *page, | |
1896 | size_t count) | |
1897 | { | |
1898 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1899 | unsigned long tmp; | |
1900 | int ret; | |
1901 | ||
6708bb27 | 1902 | if (!lun->lun_sep) |
c66ac9db NB |
1903 | return -ENODEV; |
1904 | ||
1905 | ret = strict_strtoul(page, 0, &tmp); | |
1906 | if (ret < 0) { | |
6708bb27 | 1907 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1908 | return -EINVAL; |
1909 | } | |
1910 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1911 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1912 | tmp); |
1913 | return -EINVAL; | |
1914 | } | |
1915 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1916 | if (!tg_pt_gp_mem) { |
1917 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1918 | return -EINVAL; |
1919 | } | |
1920 | ||
1921 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1922 | lun->lun_sep, 0, (int)tmp); | |
1923 | if (ret < 0) | |
1924 | return -EINVAL; | |
1925 | ||
1926 | return count; | |
1927 | } | |
1928 | ||
1929 | ssize_t core_alua_show_secondary_status( | |
1930 | struct se_lun *lun, | |
1931 | char *page) | |
1932 | { | |
1933 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1934 | } | |
1935 | ||
1936 | ssize_t core_alua_store_secondary_status( | |
1937 | struct se_lun *lun, | |
1938 | const char *page, | |
1939 | size_t count) | |
1940 | { | |
1941 | unsigned long tmp; | |
1942 | int ret; | |
1943 | ||
1944 | ret = strict_strtoul(page, 0, &tmp); | |
1945 | if (ret < 0) { | |
6708bb27 | 1946 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
1947 | return -EINVAL; |
1948 | } | |
1949 | if ((tmp != ALUA_STATUS_NONE) && | |
1950 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1951 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 1952 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
1953 | tmp); |
1954 | return -EINVAL; | |
1955 | } | |
1956 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
1957 | ||
1958 | return count; | |
1959 | } | |
1960 | ||
1961 | ssize_t core_alua_show_secondary_write_metadata( | |
1962 | struct se_lun *lun, | |
1963 | char *page) | |
1964 | { | |
1965 | return sprintf(page, "%d\n", | |
1966 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
1967 | } | |
1968 | ||
1969 | ssize_t core_alua_store_secondary_write_metadata( | |
1970 | struct se_lun *lun, | |
1971 | const char *page, | |
1972 | size_t count) | |
1973 | { | |
1974 | unsigned long tmp; | |
1975 | int ret; | |
1976 | ||
1977 | ret = strict_strtoul(page, 0, &tmp); | |
1978 | if (ret < 0) { | |
6708bb27 | 1979 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
1980 | return -EINVAL; |
1981 | } | |
1982 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1983 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
1984 | " %lu\n", tmp); |
1985 | return -EINVAL; | |
1986 | } | |
1987 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
1988 | ||
1989 | return count; | |
1990 | } | |
1991 | ||
1992 | int core_setup_alua(struct se_device *dev, int force_pt) | |
1993 | { | |
1994 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1995 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1996 | struct t10_alua_lu_gp_member *lu_gp_mem; |
1997 | /* | |
1998 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic | |
1999 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can | |
2000 | * cause a problem because libata and some SATA RAID HBAs appear | |
2001 | * under Linux/SCSI, but emulate SCSI logic themselves. | |
2002 | */ | |
e3d6f909 AG |
2003 | if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
2004 | !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) { | |
c66ac9db NB |
2005 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
2006 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2007 | pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
e3d6f909 | 2008 | " emulation\n", dev->transport->name); |
c66ac9db NB |
2009 | return 0; |
2010 | } | |
2011 | /* | |
2012 | * If SPC-3 or above is reported by real or emulated struct se_device, | |
2013 | * use emulated ALUA. | |
2014 | */ | |
e3d6f909 | 2015 | if (dev->transport->get_device_rev(dev) >= SCSI_3) { |
6708bb27 | 2016 | pr_debug("%s: Enabling ALUA Emulation for SPC-3" |
e3d6f909 | 2017 | " device\n", dev->transport->name); |
c66ac9db | 2018 | /* |
25985edc | 2019 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
2020 | * LUN Group. |
2021 | */ | |
2022 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
2023 | if (IS_ERR(lu_gp_mem)) |
2024 | return PTR_ERR(lu_gp_mem); | |
c66ac9db NB |
2025 | |
2026 | alua->alua_type = SPC3_ALUA_EMULATED; | |
2027 | alua->alua_state_check = &core_alua_state_check; | |
2028 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
2029 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2030 | default_lu_gp); |
c66ac9db NB |
2031 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2032 | ||
6708bb27 | 2033 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2034 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2035 | dev->transport->name); |
c66ac9db NB |
2036 | } else { |
2037 | alua->alua_type = SPC2_ALUA_DISABLED; | |
2038 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2039 | pr_debug("%s: Disabling ALUA Emulation for SPC-2" |
e3d6f909 | 2040 | " device\n", dev->transport->name); |
c66ac9db NB |
2041 | } |
2042 | ||
2043 | return 0; | |
2044 | } |