Commit | Line | Data |
---|---|---|
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> | |
33395fb8 | 33 | #include <asm/unaligned.h> |
c66ac9db NB |
34 | |
35 | #include <target/target_core_base.h> | |
c4795fb2 CH |
36 | #include <target/target_core_backend.h> |
37 | #include <target/target_core_fabric.h> | |
c66ac9db NB |
38 | #include <target/target_core_configfs.h> |
39 | ||
e26d99ae | 40 | #include "target_core_internal.h" |
c66ac9db | 41 | #include "target_core_alua.h" |
c66ac9db NB |
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 | */ | |
6bb35e00 | 62 | int target_emulate_report_target_port_groups(struct se_cmd *cmd) |
c66ac9db | 63 | { |
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; |
5b9a4d72 NB |
69 | u32 rd_len = 0, off; |
70 | int ext_hdr = (cmd->t_task_cdb[1] & 0x20); | |
6b20fa9a | 71 | /* |
5b9a4d72 NB |
72 | * Skip over RESERVED area to first Target port group descriptor |
73 | * depending on the PARAMETER DATA FORMAT type.. | |
6b20fa9a | 74 | */ |
5b9a4d72 NB |
75 | if (ext_hdr != 0) |
76 | off = 8; | |
77 | else | |
78 | off = 4; | |
79 | ||
80 | if (cmd->data_length < off) { | |
81 | pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" | |
82 | " small for %s header\n", cmd->data_length, | |
83 | (ext_hdr) ? "extended" : "normal"); | |
84 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
6b20fa9a NB |
85 | return -EINVAL; |
86 | } | |
4949314c | 87 | buf = transport_kmap_data_sg(cmd); |
05d1c7c0 | 88 | |
e3d6f909 AG |
89 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
90 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 91 | tg_pt_gp_list) { |
6b20fa9a NB |
92 | /* |
93 | * Check if the Target port group and Target port descriptor list | |
94 | * based on tg_pt_gp_members count will fit into the response payload. | |
95 | * Otherwise, bump rd_len to let the initiator know we have exceeded | |
96 | * the allocation length and the response is truncated. | |
97 | */ | |
98 | if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > | |
99 | cmd->data_length) { | |
100 | rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); | |
101 | continue; | |
102 | } | |
c66ac9db NB |
103 | /* |
104 | * PREF: Preferred target port bit, determine if this | |
105 | * bit should be set for port group. | |
106 | */ | |
107 | if (tg_pt_gp->tg_pt_gp_pref) | |
108 | buf[off] = 0x80; | |
109 | /* | |
110 | * Set the ASYMMETRIC ACCESS State | |
111 | */ | |
112 | buf[off++] |= (atomic_read( | |
113 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); | |
114 | /* | |
115 | * Set supported ASYMMETRIC ACCESS State bits | |
116 | */ | |
117 | buf[off] = 0x80; /* T_SUP */ | |
118 | buf[off] |= 0x40; /* O_SUP */ | |
119 | buf[off] |= 0x8; /* U_SUP */ | |
120 | buf[off] |= 0x4; /* S_SUP */ | |
121 | buf[off] |= 0x2; /* AN_SUP */ | |
122 | buf[off++] |= 0x1; /* AO_SUP */ | |
123 | /* | |
124 | * TARGET PORT GROUP | |
125 | */ | |
126 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); | |
127 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); | |
128 | ||
129 | off++; /* Skip over Reserved */ | |
130 | /* | |
131 | * STATUS CODE | |
132 | */ | |
133 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); | |
134 | /* | |
135 | * Vendor Specific field | |
136 | */ | |
137 | buf[off++] = 0x00; | |
138 | /* | |
139 | * TARGET PORT COUNT | |
140 | */ | |
141 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); | |
142 | rd_len += 8; | |
143 | ||
144 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
145 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
146 | tg_pt_gp_mem_list) { | |
147 | port = tg_pt_gp_mem->tg_pt; | |
148 | /* | |
149 | * Start Target Port descriptor format | |
150 | * | |
151 | * See spc4r17 section 6.2.7 Table 247 | |
152 | */ | |
153 | off += 2; /* Skip over Obsolete */ | |
154 | /* | |
155 | * Set RELATIVE TARGET PORT IDENTIFIER | |
156 | */ | |
157 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); | |
158 | buf[off++] = (port->sep_rtpi & 0xff); | |
159 | rd_len += 4; | |
160 | } | |
161 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
162 | } | |
e3d6f909 | 163 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
164 | /* |
165 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload | |
166 | */ | |
5b9a4d72 | 167 | put_unaligned_be32(rd_len, &buf[0]); |
c66ac9db | 168 | |
5b9a4d72 NB |
169 | /* |
170 | * Fill in the Extended header parameter data format if requested | |
171 | */ | |
172 | if (ext_hdr != 0) { | |
173 | buf[4] = 0x10; | |
174 | /* | |
175 | * Set the implict transition time (in seconds) for the application | |
176 | * client to use as a base for it's transition timeout value. | |
177 | * | |
178 | * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN | |
179 | * this CDB was received upon to determine this value individually | |
180 | * for ALUA target port group. | |
181 | */ | |
182 | port = cmd->se_lun->lun_sep; | |
183 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
184 | if (tg_pt_gp_mem) { | |
185 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
186 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
187 | if (tg_pt_gp) | |
188 | buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs; | |
189 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
190 | } | |
191 | } | |
4949314c | 192 | transport_kunmap_data_sg(cmd); |
05d1c7c0 | 193 | |
6bb35e00 | 194 | target_complete_cmd(cmd, GOOD); |
c66ac9db NB |
195 | return 0; |
196 | } | |
197 | ||
198 | /* | |
199 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. | |
200 | * | |
201 | * See spc4r17 section 6.35 | |
202 | */ | |
6bb35e00 | 203 | int target_emulate_set_target_port_groups(struct se_cmd *cmd) |
c66ac9db | 204 | { |
5951146d | 205 | struct se_device *dev = cmd->se_dev; |
e3d6f909 AG |
206 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
207 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; | |
208 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
209 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
210 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
05d1c7c0 AG |
211 | unsigned char *buf; |
212 | unsigned char *ptr; | |
c66ac9db NB |
213 | u32 len = 4; /* Skip over RESERVED area in header */ |
214 | int alua_access_state, primary = 0, rc; | |
215 | u16 tg_pt_id, rtpi; | |
216 | ||
03e98c9e NB |
217 | if (!l_port) { |
218 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
219 | return -EINVAL; | |
220 | } | |
4949314c | 221 | buf = transport_kmap_data_sg(cmd); |
05d1c7c0 | 222 | |
c66ac9db NB |
223 | /* |
224 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed | |
225 | * for the local tg_pt_gp. | |
226 | */ | |
227 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
228 | if (!l_tg_pt_gp_mem) { |
229 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); | |
03e98c9e NB |
230 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
231 | rc = -EINVAL; | |
05d1c7c0 | 232 | goto out; |
c66ac9db NB |
233 | } |
234 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
235 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 236 | if (!l_tg_pt_gp) { |
c66ac9db | 237 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 238 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
03e98c9e NB |
239 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
240 | rc = -EINVAL; | |
05d1c7c0 | 241 | goto out; |
c66ac9db NB |
242 | } |
243 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); | |
244 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
245 | ||
6708bb27 AG |
246 | if (!rc) { |
247 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" | |
c66ac9db | 248 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
03e98c9e NB |
249 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
250 | rc = -EINVAL; | |
05d1c7c0 | 251 | goto out; |
c66ac9db NB |
252 | } |
253 | ||
05d1c7c0 AG |
254 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
255 | ||
c66ac9db NB |
256 | while (len < cmd->data_length) { |
257 | alua_access_state = (ptr[0] & 0x0f); | |
258 | /* | |
259 | * Check the received ALUA access state, and determine if | |
260 | * the state is a primary or secondary target port asymmetric | |
261 | * access state. | |
262 | */ | |
263 | rc = core_alua_check_transition(alua_access_state, &primary); | |
264 | if (rc != 0) { | |
265 | /* | |
266 | * If the SET TARGET PORT GROUPS attempts to establish | |
267 | * an invalid combination of target port asymmetric | |
268 | * access states or attempts to establish an | |
269 | * unsupported target port asymmetric access state, | |
270 | * then the command shall be terminated with CHECK | |
271 | * CONDITION status, with the sense key set to ILLEGAL | |
272 | * REQUEST, and the additional sense code set to INVALID | |
273 | * FIELD IN PARAMETER LIST. | |
274 | */ | |
03e98c9e NB |
275 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
276 | rc = -EINVAL; | |
05d1c7c0 | 277 | goto out; |
c66ac9db NB |
278 | } |
279 | rc = -1; | |
280 | /* | |
281 | * If the ASYMMETRIC ACCESS STATE field (see table 267) | |
282 | * specifies a primary target port asymmetric access state, | |
283 | * then the TARGET PORT GROUP OR TARGET PORT field specifies | |
284 | * a primary target port group for which the primary target | |
285 | * port asymmetric access state shall be changed. If the | |
286 | * ASYMMETRIC ACCESS STATE field specifies a secondary target | |
287 | * port asymmetric access state, then the TARGET PORT GROUP OR | |
288 | * TARGET PORT field specifies the relative target port | |
289 | * identifier (see 3.1.120) of the target port for which the | |
290 | * secondary target port asymmetric access state shall be | |
291 | * changed. | |
292 | */ | |
293 | if (primary) { | |
33395fb8 | 294 | tg_pt_id = get_unaligned_be16(ptr + 2); |
c66ac9db NB |
295 | /* |
296 | * Locate the matching target port group ID from | |
297 | * the global tg_pt_gp list | |
298 | */ | |
e3d6f909 | 299 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 300 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 301 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db | 302 | tg_pt_gp_list) { |
6708bb27 | 303 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
304 | continue; |
305 | ||
306 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) | |
307 | continue; | |
308 | ||
309 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
310 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 311 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
312 | |
313 | rc = core_alua_do_port_transition(tg_pt_gp, | |
314 | dev, l_port, nacl, | |
315 | alua_access_state, 1); | |
316 | ||
e3d6f909 | 317 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
318 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
319 | smp_mb__after_atomic_dec(); | |
320 | break; | |
321 | } | |
e3d6f909 | 322 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
323 | /* |
324 | * If not matching target port group ID can be located | |
325 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST | |
326 | */ | |
05d1c7c0 | 327 | if (rc != 0) { |
03e98c9e NB |
328 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
329 | rc = -EINVAL; | |
05d1c7c0 AG |
330 | goto out; |
331 | } | |
c66ac9db NB |
332 | } else { |
333 | /* | |
334 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
335 | * the Target Port in question for the the incoming | |
336 | * SET_TARGET_PORT_GROUPS op. | |
337 | */ | |
33395fb8 | 338 | rtpi = get_unaligned_be16(ptr + 2); |
c66ac9db NB |
339 | /* |
340 | * Locate the matching relative target port identifer | |
341 | * for the struct se_device storage object. | |
342 | */ | |
343 | spin_lock(&dev->se_port_lock); | |
344 | list_for_each_entry(port, &dev->dev_sep_list, | |
345 | sep_list) { | |
346 | if (port->sep_rtpi != rtpi) | |
347 | continue; | |
348 | ||
349 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
350 | spin_unlock(&dev->se_port_lock); | |
351 | ||
352 | rc = core_alua_set_tg_pt_secondary_state( | |
353 | tg_pt_gp_mem, port, 1, 1); | |
354 | ||
355 | spin_lock(&dev->se_port_lock); | |
356 | break; | |
357 | } | |
358 | spin_unlock(&dev->se_port_lock); | |
359 | /* | |
360 | * If not matching relative target port identifier can | |
361 | * be located, throw an exception with ASCQ: | |
362 | * INVALID_PARAMETER_LIST | |
363 | */ | |
05d1c7c0 | 364 | if (rc != 0) { |
03e98c9e NB |
365 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
366 | rc = -EINVAL; | |
05d1c7c0 AG |
367 | goto out; |
368 | } | |
c66ac9db NB |
369 | } |
370 | ||
371 | ptr += 4; | |
372 | len += 4; | |
373 | } | |
374 | ||
05d1c7c0 | 375 | out: |
4949314c | 376 | transport_kunmap_data_sg(cmd); |
59e4f541 RD |
377 | if (!rc) |
378 | target_complete_cmd(cmd, GOOD); | |
379 | return rc; | |
c66ac9db NB |
380 | } |
381 | ||
382 | static inline int core_alua_state_nonoptimized( | |
383 | struct se_cmd *cmd, | |
384 | unsigned char *cdb, | |
385 | int nonop_delay_msecs, | |
386 | u8 *alua_ascq) | |
387 | { | |
388 | /* | |
389 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
390 | * later to determine if processing of this cmd needs to be | |
391 | * temporarily delayed for the Active/NonOptimized primary access state. | |
392 | */ | |
393 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
394 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static inline int core_alua_state_standby( | |
399 | struct se_cmd *cmd, | |
400 | unsigned char *cdb, | |
401 | u8 *alua_ascq) | |
402 | { | |
403 | /* | |
404 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
405 | * spc4r17 section 5.9.2.4.4 | |
406 | */ | |
407 | switch (cdb[0]) { | |
408 | case INQUIRY: | |
409 | case LOG_SELECT: | |
410 | case LOG_SENSE: | |
411 | case MODE_SELECT: | |
412 | case MODE_SENSE: | |
413 | case REPORT_LUNS: | |
414 | case RECEIVE_DIAGNOSTIC: | |
415 | case SEND_DIAGNOSTIC: | |
416 | case MAINTENANCE_IN: | |
ba539743 | 417 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
418 | case MI_REPORT_TARGET_PGS: |
419 | return 0; | |
420 | default: | |
421 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
422 | return 1; | |
423 | } | |
424 | case MAINTENANCE_OUT: | |
425 | switch (cdb[1]) { | |
426 | case MO_SET_TARGET_PGS: | |
427 | return 0; | |
428 | default: | |
429 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
430 | return 1; | |
431 | } | |
432 | case REQUEST_SENSE: | |
433 | case PERSISTENT_RESERVE_IN: | |
434 | case PERSISTENT_RESERVE_OUT: | |
435 | case READ_BUFFER: | |
436 | case WRITE_BUFFER: | |
437 | return 0; | |
438 | default: | |
439 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
440 | return 1; | |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | static inline int core_alua_state_unavailable( | |
447 | struct se_cmd *cmd, | |
448 | unsigned char *cdb, | |
449 | u8 *alua_ascq) | |
450 | { | |
451 | /* | |
452 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
453 | * spc4r17 section 5.9.2.4.5 | |
454 | */ | |
455 | switch (cdb[0]) { | |
456 | case INQUIRY: | |
457 | case REPORT_LUNS: | |
458 | case MAINTENANCE_IN: | |
ba539743 | 459 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
460 | case MI_REPORT_TARGET_PGS: |
461 | return 0; | |
462 | default: | |
463 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
464 | return 1; | |
465 | } | |
466 | case MAINTENANCE_OUT: | |
467 | switch (cdb[1]) { | |
468 | case MO_SET_TARGET_PGS: | |
469 | return 0; | |
470 | default: | |
471 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
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_TG_PT_UNAVAILABLE; | |
480 | return 1; | |
481 | } | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | static inline int core_alua_state_transition( | |
487 | struct se_cmd *cmd, | |
488 | unsigned char *cdb, | |
489 | u8 *alua_ascq) | |
490 | { | |
491 | /* | |
492 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
493 | * spc4r17 section 5.9.2.5 | |
494 | */ | |
495 | switch (cdb[0]) { | |
496 | case INQUIRY: | |
497 | case REPORT_LUNS: | |
498 | case MAINTENANCE_IN: | |
ba539743 | 499 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
500 | case MI_REPORT_TARGET_PGS: |
501 | return 0; | |
502 | default: | |
503 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
504 | return 1; | |
505 | } | |
506 | case REQUEST_SENSE: | |
507 | case READ_BUFFER: | |
508 | case WRITE_BUFFER: | |
509 | return 0; | |
510 | default: | |
511 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
512 | return 1; | |
513 | } | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | /* | |
519 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED | |
520 | * in transport_cmd_sequencer(). This function is assigned to | |
521 | * struct t10_alua *->state_check() in core_setup_alua() | |
522 | */ | |
523 | static int core_alua_state_check_nop( | |
524 | struct se_cmd *cmd, | |
525 | unsigned char *cdb, | |
526 | u8 *alua_ascq) | |
527 | { | |
528 | return 0; | |
529 | } | |
530 | ||
531 | /* | |
532 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). | |
533 | * This function is assigned to struct t10_alua *->state_check() in | |
534 | * core_setup_alua() | |
535 | * | |
536 | * Also, this function can return three different return codes to | |
537 | * signal transport_generic_cmd_sequencer() | |
538 | * | |
539 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready | |
540 | * return 0: Used to signal success | |
541 | * reutrn -1: Used to signal failure, and invalid cdb field | |
542 | */ | |
543 | static int core_alua_state_check( | |
544 | struct se_cmd *cmd, | |
545 | unsigned char *cdb, | |
546 | u8 *alua_ascq) | |
547 | { | |
e3d6f909 | 548 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
549 | struct se_port *port = lun->lun_sep; |
550 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
551 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
552 | int out_alua_state, nonop_delay_msecs; | |
553 | ||
6708bb27 | 554 | if (!port) |
c66ac9db NB |
555 | return 0; |
556 | /* | |
557 | * First, check for a struct se_port specific secondary ALUA target port | |
558 | * access state: OFFLINE | |
559 | */ | |
560 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
561 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
6708bb27 | 562 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db NB |
563 | " target port\n"); |
564 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
565 | return 1; | |
566 | } | |
567 | /* | |
568 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
569 | * ALUA target port group, to obtain current ALUA access state. | |
570 | * Otherwise look for the underlying struct se_device association with | |
571 | * a ALUA logical unit group. | |
572 | */ | |
573 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
574 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
575 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
576 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
577 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
578 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
579 | /* | |
25985edc LDM |
580 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
581 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
582 | * For the Optimized ALUA access state case, we want to process the |
583 | * incoming fabric cmd ASAP.. | |
584 | */ | |
585 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
586 | return 0; | |
587 | ||
588 | switch (out_alua_state) { | |
589 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
590 | return core_alua_state_nonoptimized(cmd, cdb, | |
591 | nonop_delay_msecs, alua_ascq); | |
592 | case ALUA_ACCESS_STATE_STANDBY: | |
593 | return core_alua_state_standby(cmd, cdb, alua_ascq); | |
594 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
595 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); | |
596 | case ALUA_ACCESS_STATE_TRANSITION: | |
597 | return core_alua_state_transition(cmd, cdb, alua_ascq); | |
598 | /* | |
599 | * OFFLINE is a secondary ALUA target port group access state, that is | |
600 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
601 | */ | |
602 | case ALUA_ACCESS_STATE_OFFLINE: | |
603 | default: | |
6708bb27 | 604 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 605 | out_alua_state); |
e3d6f909 | 606 | return -EINVAL; |
c66ac9db NB |
607 | } |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Check implict and explict ALUA state change request. | |
614 | */ | |
615 | static int core_alua_check_transition(int state, int *primary) | |
616 | { | |
617 | switch (state) { | |
618 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
619 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
620 | case ALUA_ACCESS_STATE_STANDBY: | |
621 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
622 | /* | |
623 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
624 | * defined as primary target port asymmetric access states. | |
625 | */ | |
626 | *primary = 1; | |
627 | break; | |
628 | case ALUA_ACCESS_STATE_OFFLINE: | |
629 | /* | |
630 | * OFFLINE state is defined as a secondary target port | |
631 | * asymmetric access state. | |
632 | */ | |
633 | *primary = 0; | |
634 | break; | |
635 | default: | |
6708bb27 | 636 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
e3d6f909 | 637 | return -EINVAL; |
c66ac9db NB |
638 | } |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static char *core_alua_dump_state(int state) | |
644 | { | |
645 | switch (state) { | |
646 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
647 | return "Active/Optimized"; | |
648 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
649 | return "Active/NonOptimized"; | |
650 | case ALUA_ACCESS_STATE_STANDBY: | |
651 | return "Standby"; | |
652 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
653 | return "Unavailable"; | |
654 | case ALUA_ACCESS_STATE_OFFLINE: | |
655 | return "Offline"; | |
656 | default: | |
657 | return "Unknown"; | |
658 | } | |
659 | ||
660 | return NULL; | |
661 | } | |
662 | ||
663 | char *core_alua_dump_status(int status) | |
664 | { | |
665 | switch (status) { | |
666 | case ALUA_STATUS_NONE: | |
667 | return "None"; | |
668 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
669 | return "Altered by Explict STPG"; | |
670 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
671 | return "Altered by Implict ALUA"; | |
672 | default: | |
673 | return "Unknown"; | |
674 | } | |
675 | ||
676 | return NULL; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Used by fabric modules to determine when we need to delay processing | |
681 | * for the Active/NonOptimized paths.. | |
682 | */ | |
683 | int core_alua_check_nonop_delay( | |
684 | struct se_cmd *cmd) | |
685 | { | |
686 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
687 | return 0; | |
688 | if (in_interrupt()) | |
689 | return 0; | |
690 | /* | |
691 | * The ALUA Active/NonOptimized access state delay can be disabled | |
692 | * in via configfs with a value of zero | |
693 | */ | |
6708bb27 | 694 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
695 | return 0; |
696 | /* | |
697 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
698 | * defined interval in core_alua_state_nonoptimized() | |
699 | */ | |
700 | msleep_interruptible(cmd->alua_nonop_delay); | |
701 | return 0; | |
702 | } | |
703 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
704 | ||
705 | /* | |
706 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
707 | * | |
708 | */ | |
709 | static int core_alua_write_tpg_metadata( | |
710 | const char *path, | |
711 | unsigned char *md_buf, | |
712 | u32 md_buf_len) | |
713 | { | |
714 | mm_segment_t old_fs; | |
715 | struct file *file; | |
716 | struct iovec iov[1]; | |
717 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; | |
718 | ||
719 | memset(iov, 0, sizeof(struct iovec)); | |
720 | ||
721 | file = filp_open(path, flags, 0600); | |
722 | if (IS_ERR(file) || !file || !file->f_dentry) { | |
6708bb27 | 723 | pr_err("filp_open(%s) for ALUA metadata failed\n", |
c66ac9db NB |
724 | path); |
725 | return -ENODEV; | |
726 | } | |
727 | ||
728 | iov[0].iov_base = &md_buf[0]; | |
729 | iov[0].iov_len = md_buf_len; | |
730 | ||
731 | old_fs = get_fs(); | |
732 | set_fs(get_ds()); | |
733 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); | |
734 | set_fs(old_fs); | |
735 | ||
736 | if (ret < 0) { | |
6708bb27 | 737 | pr_err("Error writing ALUA metadata file: %s\n", path); |
c66ac9db NB |
738 | filp_close(file, NULL); |
739 | return -EIO; | |
740 | } | |
741 | filp_close(file, NULL); | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | /* | |
747 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
748 | */ | |
749 | static int core_alua_update_tpg_primary_metadata( | |
750 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
751 | int primary_state, | |
752 | unsigned char *md_buf) | |
753 | { | |
754 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
755 | struct t10_wwn *wwn = &su_dev->t10_wwn; | |
756 | char path[ALUA_METADATA_PATH_LEN]; | |
757 | int len; | |
758 | ||
759 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
760 | ||
761 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
762 | "tg_pt_gp_id=%hu\n" | |
763 | "alua_access_state=0x%02x\n" | |
764 | "alua_access_status=0x%02x\n", | |
765 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
766 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
767 | ||
768 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
769 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
770 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
771 | ||
772 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
773 | } | |
774 | ||
775 | static int core_alua_do_transition_tg_pt( | |
776 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
777 | struct se_port *l_port, | |
778 | struct se_node_acl *nacl, | |
779 | unsigned char *md_buf, | |
780 | int new_state, | |
781 | int explict) | |
782 | { | |
783 | struct se_dev_entry *se_deve; | |
784 | struct se_lun_acl *lacl; | |
785 | struct se_port *port; | |
786 | struct t10_alua_tg_pt_gp_member *mem; | |
787 | int old_state = 0; | |
788 | /* | |
789 | * Save the old primary ALUA access state, and set the current state | |
790 | * to ALUA_ACCESS_STATE_TRANSITION. | |
791 | */ | |
792 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
793 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
794 | ALUA_ACCESS_STATE_TRANSITION); | |
795 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
796 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
797 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
798 | /* | |
799 | * Check for the optional ALUA primary state transition delay | |
800 | */ | |
801 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
802 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
803 | ||
804 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
805 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
806 | tg_pt_gp_mem_list) { | |
807 | port = mem->tg_pt; | |
808 | /* | |
809 | * After an implicit target port asymmetric access state | |
810 | * change, a device server shall establish a unit attention | |
811 | * condition for the initiator port associated with every I_T | |
812 | * nexus with the additional sense code set to ASYMMETRIC | |
813 | * ACCESS STATE CHAGED. | |
814 | * | |
815 | * After an explicit target port asymmetric access state | |
816 | * change, a device server shall establish a unit attention | |
817 | * condition with the additional sense code set to ASYMMETRIC | |
818 | * ACCESS STATE CHANGED for the initiator port associated with | |
819 | * every I_T nexus other than the I_T nexus on which the SET | |
820 | * TARGET PORT GROUPS command | |
821 | */ | |
822 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
823 | smp_mb__after_atomic_inc(); | |
824 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
825 | ||
826 | spin_lock_bh(&port->sep_alua_lock); | |
827 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
828 | alua_port_list) { | |
829 | lacl = se_deve->se_lun_acl; | |
830 | /* | |
831 | * se_deve->se_lun_acl pointer may be NULL for a | |
832 | * entry created without explict Node+MappedLUN ACLs | |
833 | */ | |
6708bb27 | 834 | if (!lacl) |
c66ac9db NB |
835 | continue; |
836 | ||
837 | if (explict && | |
838 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
839 | (l_port != NULL) && (l_port == port)) | |
840 | continue; | |
841 | ||
842 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
843 | se_deve->mapped_lun, 0x2A, | |
844 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
845 | } | |
846 | spin_unlock_bh(&port->sep_alua_lock); | |
847 | ||
848 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
849 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
850 | smp_mb__after_atomic_dec(); | |
851 | } | |
852 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
853 | /* | |
854 | * Update the ALUA metadata buf that has been allocated in | |
855 | * core_alua_do_port_transition(), this metadata will be written | |
856 | * to struct file. | |
857 | * | |
858 | * Note that there is the case where we do not want to update the | |
859 | * metadata when the saved metadata is being parsed in userspace | |
860 | * when setting the existing port access state and access status. | |
861 | * | |
862 | * Also note that the failure to write out the ALUA metadata to | |
863 | * struct file does NOT affect the actual ALUA transition. | |
864 | */ | |
865 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
866 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
867 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
868 | new_state, md_buf); | |
869 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
870 | } | |
871 | /* | |
872 | * Set the current primary ALUA access state to the requested new state | |
873 | */ | |
874 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
875 | ||
6708bb27 | 876 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
877 | " from primary access state %s to %s\n", (explict) ? "explict" : |
878 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
879 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
880 | core_alua_dump_state(new_state)); | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | int core_alua_do_port_transition( | |
886 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
887 | struct se_device *l_dev, | |
888 | struct se_port *l_port, | |
889 | struct se_node_acl *l_nacl, | |
890 | int new_state, | |
891 | int explict) | |
892 | { | |
893 | struct se_device *dev; | |
894 | struct se_port *port; | |
895 | struct se_subsystem_dev *su_dev; | |
896 | struct se_node_acl *nacl; | |
897 | struct t10_alua_lu_gp *lu_gp; | |
898 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
899 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
900 | unsigned char *md_buf; | |
901 | int primary; | |
902 | ||
903 | if (core_alua_check_transition(new_state, &primary) != 0) | |
904 | return -EINVAL; | |
905 | ||
906 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
907 | if (!md_buf) { |
908 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
909 | return -ENOMEM; |
910 | } | |
911 | ||
912 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
913 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
914 | lu_gp = local_lu_gp_mem->lu_gp; | |
915 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
916 | smp_mb__after_atomic_inc(); | |
917 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
918 | /* | |
919 | * For storage objects that are members of the 'default_lu_gp', | |
920 | * we only do transition on the passed *l_tp_pt_gp, and not | |
921 | * on all of the matching target port groups IDs in default_lu_gp. | |
922 | */ | |
6708bb27 | 923 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
924 | /* |
925 | * core_alua_do_transition_tg_pt() will always return | |
926 | * success. | |
927 | */ | |
928 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
929 | md_buf, new_state, explict); | |
930 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
931 | smp_mb__after_atomic_dec(); | |
932 | kfree(md_buf); | |
933 | return 0; | |
934 | } | |
935 | /* | |
936 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
937 | * the associated storage objects looking for a matching target port | |
938 | * group ID from the local target port group. | |
939 | */ | |
940 | spin_lock(&lu_gp->lu_gp_lock); | |
941 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
942 | lu_gp_mem_list) { | |
943 | ||
944 | dev = lu_gp_mem->lu_gp_mem_dev; | |
945 | su_dev = dev->se_sub_dev; | |
946 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
947 | smp_mb__after_atomic_inc(); | |
948 | spin_unlock(&lu_gp->lu_gp_lock); | |
949 | ||
e3d6f909 | 950 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 951 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 952 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
953 | tg_pt_gp_list) { |
954 | ||
6708bb27 | 955 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
956 | continue; |
957 | /* | |
958 | * If the target behavior port asymmetric access state | |
959 | * is changed for any target port group accessiable via | |
960 | * a logical unit within a LU group, the target port | |
961 | * behavior group asymmetric access states for the same | |
962 | * target port group accessible via other logical units | |
963 | * in that LU group will also change. | |
964 | */ | |
965 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
966 | continue; | |
967 | ||
968 | if (l_tg_pt_gp == tg_pt_gp) { | |
969 | port = l_port; | |
970 | nacl = l_nacl; | |
971 | } else { | |
972 | port = NULL; | |
973 | nacl = NULL; | |
974 | } | |
975 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
976 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 977 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
978 | /* |
979 | * core_alua_do_transition_tg_pt() will always return | |
980 | * success. | |
981 | */ | |
982 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
983 | nacl, md_buf, new_state, explict); | |
984 | ||
e3d6f909 | 985 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
986 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
987 | smp_mb__after_atomic_dec(); | |
988 | } | |
e3d6f909 | 989 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
990 | |
991 | spin_lock(&lu_gp->lu_gp_lock); | |
992 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
993 | smp_mb__after_atomic_dec(); | |
994 | } | |
995 | spin_unlock(&lu_gp->lu_gp_lock); | |
996 | ||
6708bb27 | 997 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
998 | " Group IDs: %hu %s transition to primary state: %s\n", |
999 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
1000 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
1001 | core_alua_dump_state(new_state)); | |
1002 | ||
1003 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
1004 | smp_mb__after_atomic_dec(); | |
1005 | kfree(md_buf); | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
1011 | */ | |
1012 | static int core_alua_update_tpg_secondary_metadata( | |
1013 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1014 | struct se_port *port, | |
1015 | unsigned char *md_buf, | |
1016 | u32 md_buf_len) | |
1017 | { | |
1018 | struct se_portal_group *se_tpg = port->sep_tpg; | |
1019 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
1020 | int len; | |
1021 | ||
1022 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
1023 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
1024 | ||
1025 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 1026 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 1027 | |
e3d6f909 | 1028 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 1029 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 1030 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
1031 | |
1032 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
1033 | "alua_tg_pt_status=0x%02x\n", | |
1034 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
1035 | port->sep_tg_pt_secondary_stat); | |
1036 | ||
1037 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 1038 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
1039 | port->sep_lun->unpacked_lun); |
1040 | ||
1041 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
1042 | } | |
1043 | ||
1044 | static int core_alua_set_tg_pt_secondary_state( | |
1045 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1046 | struct se_port *port, | |
1047 | int explict, | |
1048 | int offline) | |
1049 | { | |
1050 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1051 | unsigned char *md_buf; | |
1052 | u32 md_buf_len; | |
1053 | int trans_delay_msecs; | |
1054 | ||
1055 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1056 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1057 | if (!tg_pt_gp) { |
c66ac9db | 1058 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1059 | pr_err("Unable to complete secondary state" |
c66ac9db | 1060 | " transition\n"); |
e3d6f909 | 1061 | return -EINVAL; |
c66ac9db NB |
1062 | } |
1063 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1064 | /* | |
1065 | * Set the secondary ALUA target port access state to OFFLINE | |
1066 | * or release the previously secondary state for struct se_port | |
1067 | */ | |
1068 | if (offline) | |
1069 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1070 | else | |
1071 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1072 | ||
1073 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1074 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1075 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1076 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1077 | ||
6708bb27 | 1078 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1079 | " to secondary access state: %s\n", (explict) ? "explict" : |
1080 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1081 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1082 | ||
1083 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1084 | /* | |
1085 | * Do the optional transition delay after we set the secondary | |
1086 | * ALUA access state. | |
1087 | */ | |
1088 | if (trans_delay_msecs != 0) | |
1089 | msleep_interruptible(trans_delay_msecs); | |
1090 | /* | |
1091 | * See if we need to update the ALUA fabric port metadata for | |
1092 | * secondary state and status | |
1093 | */ | |
1094 | if (port->sep_tg_pt_secondary_write_md) { | |
1095 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1096 | if (!md_buf) { |
1097 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1098 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1099 | return -ENOMEM; |
c66ac9db NB |
1100 | } |
1101 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1102 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1103 | md_buf, md_buf_len); | |
1104 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1105 | ||
1106 | kfree(md_buf); | |
1107 | } | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | struct t10_alua_lu_gp * | |
1113 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1114 | { | |
1115 | struct t10_alua_lu_gp *lu_gp; | |
1116 | ||
1117 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1118 | if (!lu_gp) { |
1119 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1120 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1121 | } |
e3d6f909 | 1122 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1123 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1124 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1125 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1126 | ||
1127 | if (def_group) { | |
e3d6f909 | 1128 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1129 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1130 | alua_lu_gps_count++; |
c66ac9db NB |
1131 | } |
1132 | ||
1133 | return lu_gp; | |
1134 | } | |
1135 | ||
1136 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1137 | { | |
1138 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1139 | u16 lu_gp_id_tmp; | |
1140 | /* | |
1141 | * The lu_gp->lu_gp_id may only be set once.. | |
1142 | */ | |
1143 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1144 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1145 | " ignoring request\n"); |
e3d6f909 | 1146 | return -EINVAL; |
c66ac9db NB |
1147 | } |
1148 | ||
e3d6f909 AG |
1149 | spin_lock(&lu_gps_lock); |
1150 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1151 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1152 | " 0x0000ffff reached\n"); |
e3d6f909 | 1153 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1154 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1155 | return -ENOSPC; |
c66ac9db NB |
1156 | } |
1157 | again: | |
1158 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1159 | alua_lu_gps_counter++; |
c66ac9db | 1160 | |
e3d6f909 | 1161 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1162 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1163 | if (!lu_gp_id) |
c66ac9db NB |
1164 | goto again; |
1165 | ||
6708bb27 | 1166 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1167 | " already exists, ignoring request\n", |
1168 | lu_gp_id); | |
e3d6f909 AG |
1169 | spin_unlock(&lu_gps_lock); |
1170 | return -EINVAL; | |
c66ac9db NB |
1171 | } |
1172 | } | |
1173 | ||
1174 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1175 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1176 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1177 | alua_lu_gps_count++; | |
1178 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1179 | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static struct t10_alua_lu_gp_member * | |
1184 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1185 | { | |
1186 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1187 | ||
1188 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1189 | if (!lu_gp_mem) { |
1190 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1191 | return ERR_PTR(-ENOMEM); |
1192 | } | |
1193 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1194 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1195 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1196 | ||
1197 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1198 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1199 | ||
1200 | return lu_gp_mem; | |
1201 | } | |
1202 | ||
1203 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1204 | { | |
1205 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1206 | /* | |
1207 | * Once we have reached this point, config_item_put() has | |
1208 | * already been called from target_core_alua_drop_lu_gp(). | |
1209 | * | |
1210 | * Here, we remove the *lu_gp from the global list so that | |
1211 | * no associations can be made while we are releasing | |
1212 | * struct t10_alua_lu_gp. | |
1213 | */ | |
e3d6f909 | 1214 | spin_lock(&lu_gps_lock); |
e3d6f909 AG |
1215 | list_del(&lu_gp->lu_gp_node); |
1216 | alua_lu_gps_count--; | |
1217 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1218 | /* |
1219 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1220 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1221 | * released with core_alua_put_lu_gp_from_name() | |
1222 | */ | |
1223 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1224 | cpu_relax(); | |
1225 | /* | |
1226 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1227 | * struct se_device. | |
1228 | */ | |
1229 | spin_lock(&lu_gp->lu_gp_lock); | |
1230 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1231 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1232 | if (lu_gp_mem->lu_gp_assoc) { | |
1233 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1234 | lu_gp->lu_gp_members--; | |
1235 | lu_gp_mem->lu_gp_assoc = 0; | |
1236 | } | |
1237 | spin_unlock(&lu_gp->lu_gp_lock); | |
1238 | /* | |
1239 | * | |
25985edc | 1240 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1241 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1242 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1243 | * | |
1244 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1245 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1246 | */ | |
1247 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1248 | if (lu_gp != default_lu_gp) |
c66ac9db | 1249 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1250 | default_lu_gp); |
c66ac9db NB |
1251 | else |
1252 | lu_gp_mem->lu_gp = NULL; | |
1253 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1254 | ||
1255 | spin_lock(&lu_gp->lu_gp_lock); | |
1256 | } | |
1257 | spin_unlock(&lu_gp->lu_gp_lock); | |
1258 | ||
1259 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1260 | } | |
1261 | ||
1262 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1263 | { | |
1264 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1265 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1266 | struct t10_alua_lu_gp *lu_gp; |
1267 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1268 | ||
1269 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1270 | return; | |
1271 | ||
1272 | lu_gp_mem = dev->dev_alua_lu_gp_mem; | |
6708bb27 | 1273 | if (!lu_gp_mem) |
c66ac9db NB |
1274 | return; |
1275 | ||
1276 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1277 | cpu_relax(); | |
1278 | ||
1279 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1280 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1281 | if (lu_gp) { |
c66ac9db NB |
1282 | spin_lock(&lu_gp->lu_gp_lock); |
1283 | if (lu_gp_mem->lu_gp_assoc) { | |
1284 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1285 | lu_gp->lu_gp_members--; | |
1286 | lu_gp_mem->lu_gp_assoc = 0; | |
1287 | } | |
1288 | spin_unlock(&lu_gp->lu_gp_lock); | |
1289 | lu_gp_mem->lu_gp = NULL; | |
1290 | } | |
1291 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1292 | ||
1293 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1294 | } | |
1295 | ||
1296 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1297 | { | |
1298 | struct t10_alua_lu_gp *lu_gp; | |
1299 | struct config_item *ci; | |
1300 | ||
e3d6f909 AG |
1301 | spin_lock(&lu_gps_lock); |
1302 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1303 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1304 | continue; |
1305 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1306 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1307 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1308 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1309 | return lu_gp; |
1310 | } | |
1311 | } | |
e3d6f909 | 1312 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1313 | |
1314 | return NULL; | |
1315 | } | |
1316 | ||
1317 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1318 | { | |
e3d6f909 | 1319 | spin_lock(&lu_gps_lock); |
c66ac9db | 1320 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1321 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1322 | } |
1323 | ||
1324 | /* | |
1325 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1326 | */ | |
1327 | void __core_alua_attach_lu_gp_mem( | |
1328 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1329 | struct t10_alua_lu_gp *lu_gp) | |
1330 | { | |
1331 | spin_lock(&lu_gp->lu_gp_lock); | |
1332 | lu_gp_mem->lu_gp = lu_gp; | |
1333 | lu_gp_mem->lu_gp_assoc = 1; | |
1334 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1335 | lu_gp->lu_gp_members++; | |
1336 | spin_unlock(&lu_gp->lu_gp_lock); | |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1341 | */ | |
1342 | void __core_alua_drop_lu_gp_mem( | |
1343 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1344 | struct t10_alua_lu_gp *lu_gp) | |
1345 | { | |
1346 | spin_lock(&lu_gp->lu_gp_lock); | |
1347 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1348 | lu_gp_mem->lu_gp = NULL; | |
1349 | lu_gp_mem->lu_gp_assoc = 0; | |
1350 | lu_gp->lu_gp_members--; | |
1351 | spin_unlock(&lu_gp->lu_gp_lock); | |
1352 | } | |
1353 | ||
1354 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( | |
1355 | struct se_subsystem_dev *su_dev, | |
1356 | const char *name, | |
1357 | int def_group) | |
1358 | { | |
1359 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1360 | ||
1361 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1362 | if (!tg_pt_gp) { |
1363 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1364 | return NULL; |
1365 | } | |
1366 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1367 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1368 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1369 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1370 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
1371 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; | |
1372 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; | |
1373 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1374 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1375 | /* | |
1376 | * Enable both explict and implict ALUA support by default | |
1377 | */ | |
1378 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1379 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1380 | /* | |
1381 | * Set the default Active/NonOptimized Delay in milliseconds | |
1382 | */ | |
1383 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1384 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
5b9a4d72 | 1385 | tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; |
c66ac9db NB |
1386 | |
1387 | if (def_group) { | |
e3d6f909 | 1388 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1389 | tg_pt_gp->tg_pt_gp_id = |
e3d6f909 | 1390 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1391 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
e3d6f909 | 1392 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1393 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
e3d6f909 AG |
1394 | &su_dev->t10_alua.tg_pt_gps_list); |
1395 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1396 | } |
1397 | ||
1398 | return tg_pt_gp; | |
1399 | } | |
1400 | ||
1401 | int core_alua_set_tg_pt_gp_id( | |
1402 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1403 | u16 tg_pt_gp_id) | |
1404 | { | |
1405 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1406 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; | |
1407 | u16 tg_pt_gp_id_tmp; | |
1408 | /* | |
1409 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1410 | */ | |
1411 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1412 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1413 | " ignoring request\n"); |
e3d6f909 | 1414 | return -EINVAL; |
c66ac9db NB |
1415 | } |
1416 | ||
e3d6f909 AG |
1417 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1418 | if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1419 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1420 | " 0x0000ffff reached\n"); |
e3d6f909 | 1421 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1422 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1423 | return -ENOSPC; |
c66ac9db NB |
1424 | } |
1425 | again: | |
1426 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
e3d6f909 | 1427 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1428 | |
e3d6f909 | 1429 | list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1430 | tg_pt_gp_list) { |
1431 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1432 | if (!tg_pt_gp_id) |
c66ac9db NB |
1433 | goto again; |
1434 | ||
6708bb27 | 1435 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1436 | " exists, ignoring request\n", tg_pt_gp_id); |
e3d6f909 AG |
1437 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
1438 | return -EINVAL; | |
c66ac9db NB |
1439 | } |
1440 | } | |
1441 | ||
1442 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1443 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1444 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
e3d6f909 AG |
1445 | &su_dev->t10_alua.tg_pt_gps_list); |
1446 | su_dev->t10_alua.alua_tg_pt_gps_count++; | |
1447 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1448 | |
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1453 | struct se_port *port) | |
1454 | { | |
1455 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1456 | ||
1457 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1458 | GFP_KERNEL); | |
6708bb27 AG |
1459 | if (!tg_pt_gp_mem) { |
1460 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1461 | return ERR_PTR(-ENOMEM); |
1462 | } | |
1463 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1464 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1465 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1466 | ||
1467 | tg_pt_gp_mem->tg_pt = port; | |
1468 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
c66ac9db NB |
1469 | |
1470 | return tg_pt_gp_mem; | |
1471 | } | |
1472 | ||
1473 | void core_alua_free_tg_pt_gp( | |
1474 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1475 | { | |
1476 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1477 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; | |
1478 | /* | |
1479 | * Once we have reached this point, config_item_put() has already | |
1480 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1481 | * | |
1482 | * Here we remove *tg_pt_gp from the global list so that | |
1483 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1484 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1485 | */ | |
e3d6f909 | 1486 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1487 | list_del(&tg_pt_gp->tg_pt_gp_list); |
e3d6f909 AG |
1488 | su_dev->t10_alua.alua_tg_pt_gps_counter--; |
1489 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1490 | /* |
1491 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1492 | * core_alua_get_tg_pt_gp_by_name() in | |
1493 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1494 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1495 | */ | |
1496 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1497 | cpu_relax(); | |
1498 | /* | |
1499 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1500 | * struct se_port. | |
1501 | */ | |
1502 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1503 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1504 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1505 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1506 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1507 | tg_pt_gp->tg_pt_gp_members--; | |
1508 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1509 | } | |
1510 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1511 | /* | |
25985edc | 1512 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1513 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1514 | * core_alua_free_tg_pt_gp_mem(). | |
1515 | * | |
1516 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1517 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1518 | * default_tg_pt_gp. | |
1519 | */ | |
1520 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
e3d6f909 | 1521 | if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1522 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
e3d6f909 | 1523 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1524 | } else |
1525 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1526 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1527 | ||
1528 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1529 | } | |
1530 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1531 | ||
1532 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1533 | } | |
1534 | ||
1535 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1536 | { | |
1537 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
e3d6f909 | 1538 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1539 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1540 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1541 | ||
1542 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1543 | return; | |
1544 | ||
1545 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1546 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1547 | return; |
1548 | ||
1549 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1550 | cpu_relax(); | |
1551 | ||
1552 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1553 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1554 | if (tg_pt_gp) { |
c66ac9db NB |
1555 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1556 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1557 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1558 | tg_pt_gp->tg_pt_gp_members--; | |
1559 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1560 | } | |
1561 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1562 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1563 | } | |
1564 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1565 | ||
1566 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1567 | } | |
1568 | ||
1569 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
1570 | struct se_subsystem_dev *su_dev, | |
1571 | const char *name) | |
1572 | { | |
1573 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1574 | struct config_item *ci; | |
1575 | ||
e3d6f909 AG |
1576 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1577 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1578 | tg_pt_gp_list) { |
6708bb27 | 1579 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1580 | continue; |
1581 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1582 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1583 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1584 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1585 | return tg_pt_gp; |
1586 | } | |
1587 | } | |
e3d6f909 | 1588 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1589 | |
1590 | return NULL; | |
1591 | } | |
1592 | ||
1593 | static void core_alua_put_tg_pt_gp_from_name( | |
1594 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1595 | { | |
1596 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1597 | ||
e3d6f909 | 1598 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1599 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1600 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1601 | } |
1602 | ||
1603 | /* | |
1604 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1605 | */ | |
1606 | void __core_alua_attach_tg_pt_gp_mem( | |
1607 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1608 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1609 | { | |
1610 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1611 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1612 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1613 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1614 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1615 | tg_pt_gp->tg_pt_gp_members++; | |
1616 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1617 | } | |
1618 | ||
1619 | /* | |
1620 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1621 | */ | |
1622 | static void __core_alua_drop_tg_pt_gp_mem( | |
1623 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1624 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1625 | { | |
1626 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1627 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1628 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1629 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1630 | tg_pt_gp->tg_pt_gp_members--; | |
1631 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1632 | } | |
1633 | ||
1634 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1635 | { | |
1636 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1637 | struct config_item *tg_pt_ci; | |
e3d6f909 | 1638 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1639 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1640 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1641 | ssize_t len = 0; | |
1642 | ||
1643 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1644 | return len; | |
1645 | ||
1646 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1647 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1648 | return len; |
1649 | ||
1650 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1651 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1652 | if (tg_pt_gp) { |
c66ac9db NB |
1653 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1654 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1655 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1656 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1657 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1658 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1659 | core_alua_dump_state(atomic_read( | |
1660 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1661 | core_alua_dump_status( | |
1662 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1663 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1664 | "Offline" : "None", | |
1665 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1666 | } | |
1667 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1668 | ||
1669 | return len; | |
1670 | } | |
1671 | ||
1672 | ssize_t core_alua_store_tg_pt_gp_info( | |
1673 | struct se_port *port, | |
1674 | const char *page, | |
1675 | size_t count) | |
1676 | { | |
1677 | struct se_portal_group *tpg; | |
1678 | struct se_lun *lun; | |
1679 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1680 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; | |
1681 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1682 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1683 | int move = 0; | |
1684 | ||
1685 | tpg = port->sep_tpg; | |
1686 | lun = port->sep_lun; | |
1687 | ||
e3d6f909 | 1688 | if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) { |
6708bb27 | 1689 | pr_warn("SPC3_ALUA_EMULATED not enabled for" |
e3d6f909 AG |
1690 | " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1691 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1692 | config_item_name(&lun->lun_group.cg_item)); |
1693 | return -EINVAL; | |
1694 | } | |
1695 | ||
1696 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1697 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1698 | return -EINVAL; |
1699 | } | |
1700 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1701 | memcpy(buf, page, count); | |
1702 | /* | |
1703 | * Any ALUA target port group alias besides "NULL" means we will be | |
1704 | * making a new group association. | |
1705 | */ | |
1706 | if (strcmp(strstrip(buf), "NULL")) { | |
1707 | /* | |
1708 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1709 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1710 | * core_alua_put_tg_pt_gp_from_name() below. | |
1711 | */ | |
1712 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, | |
1713 | strstrip(buf)); | |
6708bb27 | 1714 | if (!tg_pt_gp_new) |
c66ac9db NB |
1715 | return -ENODEV; |
1716 | } | |
1717 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
6708bb27 | 1718 | if (!tg_pt_gp_mem) { |
c66ac9db NB |
1719 | if (tg_pt_gp_new) |
1720 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
6708bb27 | 1721 | pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); |
c66ac9db NB |
1722 | return -EINVAL; |
1723 | } | |
1724 | ||
1725 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1726 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1727 | if (tg_pt_gp) { |
c66ac9db NB |
1728 | /* |
1729 | * Clearing an existing tg_pt_gp association, and replacing | |
1730 | * with the default_tg_pt_gp. | |
1731 | */ | |
6708bb27 AG |
1732 | if (!tg_pt_gp_new) { |
1733 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1734 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1735 | " alua/%s, ID: %hu back to" | |
1736 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1737 | 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( | |
1741 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1742 | tg_pt_gp->tg_pt_gp_id); | |
1743 | ||
1744 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1745 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
e3d6f909 | 1746 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1747 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1748 | ||
1749 | return count; | |
1750 | } | |
1751 | /* | |
1752 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1753 | */ | |
1754 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1755 | move = 1; | |
1756 | } | |
1757 | /* | |
1758 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1759 | */ | |
1760 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1761 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1762 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1763 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1764 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1765 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1766 | config_item_name(&lun->lun_group.cg_item), |
1767 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1768 | tg_pt_gp_new->tg_pt_gp_id); | |
1769 | ||
1770 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1771 | return count; | |
1772 | } | |
1773 | ||
1774 | ssize_t core_alua_show_access_type( | |
1775 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1776 | char *page) | |
1777 | { | |
1778 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1779 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1780 | return sprintf(page, "Implict and Explict\n"); | |
1781 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1782 | return sprintf(page, "Implict\n"); | |
1783 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1784 | return sprintf(page, "Explict\n"); | |
1785 | else | |
1786 | return sprintf(page, "None\n"); | |
1787 | } | |
1788 | ||
1789 | ssize_t core_alua_store_access_type( | |
1790 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1791 | const char *page, | |
1792 | size_t count) | |
1793 | { | |
1794 | unsigned long tmp; | |
1795 | int ret; | |
1796 | ||
1797 | ret = strict_strtoul(page, 0, &tmp); | |
1798 | if (ret < 0) { | |
6708bb27 | 1799 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1800 | return -EINVAL; |
1801 | } | |
1802 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1803 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1804 | " %lu\n", tmp); |
1805 | return -EINVAL; | |
1806 | } | |
1807 | if (tmp == 3) | |
1808 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1809 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1810 | else if (tmp == 2) | |
1811 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1812 | else if (tmp == 1) | |
1813 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1814 | else | |
1815 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1816 | ||
1817 | return count; | |
1818 | } | |
1819 | ||
1820 | ssize_t core_alua_show_nonop_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_nonop_delay_msecs); | |
1825 | } | |
1826 | ||
1827 | ssize_t core_alua_store_nonop_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 nonop_delay_msecs\n"); |
c66ac9db NB |
1838 | return -EINVAL; |
1839 | } | |
1840 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1841 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1842 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1843 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1844 | return -EINVAL; | |
1845 | } | |
1846 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1847 | ||
1848 | return count; | |
1849 | } | |
1850 | ||
1851 | ssize_t core_alua_show_trans_delay_msecs( | |
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_trans_delay_msecs); | |
1856 | } | |
1857 | ||
1858 | ssize_t core_alua_store_trans_delay_msecs( | |
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 trans_delay_msecs\n"); |
c66ac9db NB |
1869 | return -EINVAL; |
1870 | } | |
1871 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1872 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1873 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1874 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1875 | return -EINVAL; | |
1876 | } | |
1877 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1878 | ||
1879 | return count; | |
1880 | } | |
1881 | ||
5b9a4d72 NB |
1882 | ssize_t core_alua_show_implict_trans_secs( |
1883 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1884 | char *page) | |
1885 | { | |
1886 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); | |
1887 | } | |
1888 | ||
1889 | ssize_t core_alua_store_implict_trans_secs( | |
1890 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1891 | const char *page, | |
1892 | size_t count) | |
1893 | { | |
1894 | unsigned long tmp; | |
1895 | int ret; | |
1896 | ||
1897 | ret = strict_strtoul(page, 0, &tmp); | |
1898 | if (ret < 0) { | |
1899 | pr_err("Unable to extract implict_trans_secs\n"); | |
1900 | return -EINVAL; | |
1901 | } | |
1902 | if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { | |
1903 | pr_err("Passed implict_trans_secs: %lu, exceeds" | |
1904 | " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, | |
1905 | ALUA_MAX_IMPLICT_TRANS_SECS); | |
1906 | return -EINVAL; | |
1907 | } | |
1908 | tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; | |
1909 | ||
1910 | return count; | |
1911 | } | |
1912 | ||
c66ac9db NB |
1913 | ssize_t core_alua_show_preferred_bit( |
1914 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1915 | char *page) | |
1916 | { | |
1917 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1918 | } | |
1919 | ||
1920 | ssize_t core_alua_store_preferred_bit( | |
1921 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1922 | const char *page, | |
1923 | size_t count) | |
1924 | { | |
1925 | unsigned long tmp; | |
1926 | int ret; | |
1927 | ||
1928 | ret = strict_strtoul(page, 0, &tmp); | |
1929 | if (ret < 0) { | |
6708bb27 | 1930 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1931 | return -EINVAL; |
1932 | } | |
1933 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1934 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1935 | return -EINVAL; |
1936 | } | |
1937 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1938 | ||
1939 | return count; | |
1940 | } | |
1941 | ||
1942 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1943 | { | |
6708bb27 | 1944 | if (!lun->lun_sep) |
c66ac9db NB |
1945 | return -ENODEV; |
1946 | ||
1947 | return sprintf(page, "%d\n", | |
1948 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1949 | } | |
1950 | ||
1951 | ssize_t core_alua_store_offline_bit( | |
1952 | struct se_lun *lun, | |
1953 | const char *page, | |
1954 | size_t count) | |
1955 | { | |
1956 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1957 | unsigned long tmp; | |
1958 | int ret; | |
1959 | ||
6708bb27 | 1960 | if (!lun->lun_sep) |
c66ac9db NB |
1961 | return -ENODEV; |
1962 | ||
1963 | ret = strict_strtoul(page, 0, &tmp); | |
1964 | if (ret < 0) { | |
6708bb27 | 1965 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1966 | return -EINVAL; |
1967 | } | |
1968 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1969 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1970 | tmp); |
1971 | return -EINVAL; | |
1972 | } | |
1973 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1974 | if (!tg_pt_gp_mem) { |
1975 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1976 | return -EINVAL; |
1977 | } | |
1978 | ||
1979 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1980 | lun->lun_sep, 0, (int)tmp); | |
1981 | if (ret < 0) | |
1982 | return -EINVAL; | |
1983 | ||
1984 | return count; | |
1985 | } | |
1986 | ||
1987 | ssize_t core_alua_show_secondary_status( | |
1988 | struct se_lun *lun, | |
1989 | char *page) | |
1990 | { | |
1991 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1992 | } | |
1993 | ||
1994 | ssize_t core_alua_store_secondary_status( | |
1995 | struct se_lun *lun, | |
1996 | const char *page, | |
1997 | size_t count) | |
1998 | { | |
1999 | unsigned long tmp; | |
2000 | int ret; | |
2001 | ||
2002 | ret = strict_strtoul(page, 0, &tmp); | |
2003 | if (ret < 0) { | |
6708bb27 | 2004 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
2005 | return -EINVAL; |
2006 | } | |
2007 | if ((tmp != ALUA_STATUS_NONE) && | |
2008 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
2009 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 2010 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
2011 | tmp); |
2012 | return -EINVAL; | |
2013 | } | |
2014 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
2015 | ||
2016 | return count; | |
2017 | } | |
2018 | ||
2019 | ssize_t core_alua_show_secondary_write_metadata( | |
2020 | struct se_lun *lun, | |
2021 | char *page) | |
2022 | { | |
2023 | return sprintf(page, "%d\n", | |
2024 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
2025 | } | |
2026 | ||
2027 | ssize_t core_alua_store_secondary_write_metadata( | |
2028 | struct se_lun *lun, | |
2029 | const char *page, | |
2030 | size_t count) | |
2031 | { | |
2032 | unsigned long tmp; | |
2033 | int ret; | |
2034 | ||
2035 | ret = strict_strtoul(page, 0, &tmp); | |
2036 | if (ret < 0) { | |
6708bb27 | 2037 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
2038 | return -EINVAL; |
2039 | } | |
2040 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 2041 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
2042 | " %lu\n", tmp); |
2043 | return -EINVAL; | |
2044 | } | |
2045 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
2046 | ||
2047 | return count; | |
2048 | } | |
2049 | ||
2050 | int core_setup_alua(struct se_device *dev, int force_pt) | |
2051 | { | |
2052 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 2053 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
2054 | struct t10_alua_lu_gp_member *lu_gp_mem; |
2055 | /* | |
2056 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic | |
2057 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can | |
2058 | * cause a problem because libata and some SATA RAID HBAs appear | |
2059 | * under Linux/SCSI, but emulate SCSI logic themselves. | |
2060 | */ | |
e3d6f909 AG |
2061 | if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
2062 | !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) { | |
c66ac9db NB |
2063 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
2064 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2065 | pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" |
e3d6f909 | 2066 | " emulation\n", dev->transport->name); |
c66ac9db NB |
2067 | return 0; |
2068 | } | |
2069 | /* | |
2070 | * If SPC-3 or above is reported by real or emulated struct se_device, | |
2071 | * use emulated ALUA. | |
2072 | */ | |
e3d6f909 | 2073 | if (dev->transport->get_device_rev(dev) >= SCSI_3) { |
6708bb27 | 2074 | pr_debug("%s: Enabling ALUA Emulation for SPC-3" |
e3d6f909 | 2075 | " device\n", dev->transport->name); |
c66ac9db | 2076 | /* |
25985edc | 2077 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
2078 | * LUN Group. |
2079 | */ | |
2080 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
2081 | if (IS_ERR(lu_gp_mem)) |
2082 | return PTR_ERR(lu_gp_mem); | |
c66ac9db NB |
2083 | |
2084 | alua->alua_type = SPC3_ALUA_EMULATED; | |
2085 | alua->alua_state_check = &core_alua_state_check; | |
2086 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
2087 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2088 | default_lu_gp); |
c66ac9db NB |
2089 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2090 | ||
6708bb27 | 2091 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2092 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2093 | dev->transport->name); |
c66ac9db NB |
2094 | } else { |
2095 | alua->alua_type = SPC2_ALUA_DISABLED; | |
2096 | alua->alua_state_check = &core_alua_state_check_nop; | |
6708bb27 | 2097 | pr_debug("%s: Disabling ALUA Emulation for SPC-2" |
e3d6f909 | 2098 | " device\n", dev->transport->name); |
c66ac9db NB |
2099 | } |
2100 | ||
2101 | return 0; | |
2102 | } |