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