Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_alua.c | |
3 | * | |
4 | * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) | |
5 | * | |
6 | * Copyright (c) 2009-2010 Rising Tide Systems | |
7 | * Copyright (c) 2009-2010 Linux-iSCSI.org | |
8 | * | |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/slab.h> |
28 | #include <linux/spinlock.h> | |
29 | #include <linux/configfs.h> | |
c53181af | 30 | #include <linux/export.h> |
c66ac9db NB |
31 | #include <scsi/scsi.h> |
32 | #include <scsi/scsi_cmnd.h> | |
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 | { |
0fd97ccf | 64 | struct se_device *dev = cmd->se_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 | |
0fd97ccf CH |
89 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
90 | list_for_each_entry(tg_pt_gp, &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 | } | |
0fd97ccf | 163 | spin_unlock(&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_port *port, *l_port = cmd->se_lun->lun_sep; |
207 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
208 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
209 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
05d1c7c0 AG |
210 | unsigned char *buf; |
211 | unsigned char *ptr; | |
c66ac9db NB |
212 | u32 len = 4; /* Skip over RESERVED area in header */ |
213 | int alua_access_state, primary = 0, rc; | |
214 | u16 tg_pt_id, rtpi; | |
215 | ||
03e98c9e NB |
216 | if (!l_port) { |
217 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
218 | return -EINVAL; | |
219 | } | |
0d7f1299 PB |
220 | if (cmd->data_length < 4) { |
221 | pr_warn("SET TARGET PORT GROUPS parameter list length %u too" | |
222 | " small\n", cmd->data_length); | |
223 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
4949314c | 227 | buf = transport_kmap_data_sg(cmd); |
05d1c7c0 | 228 | |
c66ac9db NB |
229 | /* |
230 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed | |
231 | * for the local tg_pt_gp. | |
232 | */ | |
233 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
234 | if (!l_tg_pt_gp_mem) { |
235 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); | |
03e98c9e NB |
236 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
237 | rc = -EINVAL; | |
05d1c7c0 | 238 | goto out; |
c66ac9db NB |
239 | } |
240 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
241 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 242 | if (!l_tg_pt_gp) { |
c66ac9db | 243 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 244 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
03e98c9e NB |
245 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
246 | rc = -EINVAL; | |
05d1c7c0 | 247 | goto out; |
c66ac9db NB |
248 | } |
249 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); | |
250 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
251 | ||
6708bb27 AG |
252 | if (!rc) { |
253 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" | |
c66ac9db | 254 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
03e98c9e NB |
255 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
256 | rc = -EINVAL; | |
05d1c7c0 | 257 | goto out; |
c66ac9db NB |
258 | } |
259 | ||
05d1c7c0 AG |
260 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
261 | ||
c66ac9db NB |
262 | while (len < cmd->data_length) { |
263 | alua_access_state = (ptr[0] & 0x0f); | |
264 | /* | |
265 | * Check the received ALUA access state, and determine if | |
266 | * the state is a primary or secondary target port asymmetric | |
267 | * access state. | |
268 | */ | |
269 | rc = core_alua_check_transition(alua_access_state, &primary); | |
270 | if (rc != 0) { | |
271 | /* | |
272 | * If the SET TARGET PORT GROUPS attempts to establish | |
273 | * an invalid combination of target port asymmetric | |
274 | * access states or attempts to establish an | |
275 | * unsupported target port asymmetric access state, | |
276 | * then the command shall be terminated with CHECK | |
277 | * CONDITION status, with the sense key set to ILLEGAL | |
278 | * REQUEST, and the additional sense code set to INVALID | |
279 | * FIELD IN PARAMETER LIST. | |
280 | */ | |
03e98c9e NB |
281 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
282 | rc = -EINVAL; | |
05d1c7c0 | 283 | goto out; |
c66ac9db NB |
284 | } |
285 | rc = -1; | |
286 | /* | |
287 | * If the ASYMMETRIC ACCESS STATE field (see table 267) | |
288 | * specifies a primary target port asymmetric access state, | |
289 | * then the TARGET PORT GROUP OR TARGET PORT field specifies | |
290 | * a primary target port group for which the primary target | |
291 | * port asymmetric access state shall be changed. If the | |
292 | * ASYMMETRIC ACCESS STATE field specifies a secondary target | |
293 | * port asymmetric access state, then the TARGET PORT GROUP OR | |
294 | * TARGET PORT field specifies the relative target port | |
295 | * identifier (see 3.1.120) of the target port for which the | |
296 | * secondary target port asymmetric access state shall be | |
297 | * changed. | |
298 | */ | |
299 | if (primary) { | |
33395fb8 | 300 | tg_pt_id = get_unaligned_be16(ptr + 2); |
c66ac9db NB |
301 | /* |
302 | * Locate the matching target port group ID from | |
303 | * the global tg_pt_gp list | |
304 | */ | |
0fd97ccf | 305 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 306 | list_for_each_entry(tg_pt_gp, |
0fd97ccf | 307 | &dev->t10_alua.tg_pt_gps_list, |
c66ac9db | 308 | tg_pt_gp_list) { |
6708bb27 | 309 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
310 | continue; |
311 | ||
312 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) | |
313 | continue; | |
314 | ||
315 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
316 | smp_mb__after_atomic_inc(); | |
0fd97ccf | 317 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
318 | |
319 | rc = core_alua_do_port_transition(tg_pt_gp, | |
320 | dev, l_port, nacl, | |
321 | alua_access_state, 1); | |
322 | ||
0fd97ccf | 323 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
324 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
325 | smp_mb__after_atomic_dec(); | |
326 | break; | |
327 | } | |
0fd97ccf | 328 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
329 | /* |
330 | * If not matching target port group ID can be located | |
331 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST | |
332 | */ | |
05d1c7c0 | 333 | if (rc != 0) { |
03e98c9e NB |
334 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
335 | rc = -EINVAL; | |
05d1c7c0 AG |
336 | goto out; |
337 | } | |
c66ac9db NB |
338 | } else { |
339 | /* | |
340 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
341 | * the Target Port in question for the the incoming | |
342 | * SET_TARGET_PORT_GROUPS op. | |
343 | */ | |
33395fb8 | 344 | rtpi = get_unaligned_be16(ptr + 2); |
c66ac9db | 345 | /* |
35d1efe8 | 346 | * Locate the matching relative target port identifier |
c66ac9db NB |
347 | * for the struct se_device storage object. |
348 | */ | |
349 | spin_lock(&dev->se_port_lock); | |
350 | list_for_each_entry(port, &dev->dev_sep_list, | |
351 | sep_list) { | |
352 | if (port->sep_rtpi != rtpi) | |
353 | continue; | |
354 | ||
355 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
356 | spin_unlock(&dev->se_port_lock); | |
357 | ||
358 | rc = core_alua_set_tg_pt_secondary_state( | |
359 | tg_pt_gp_mem, port, 1, 1); | |
360 | ||
361 | spin_lock(&dev->se_port_lock); | |
362 | break; | |
363 | } | |
364 | spin_unlock(&dev->se_port_lock); | |
365 | /* | |
366 | * If not matching relative target port identifier can | |
367 | * be located, throw an exception with ASCQ: | |
368 | * INVALID_PARAMETER_LIST | |
369 | */ | |
05d1c7c0 | 370 | if (rc != 0) { |
03e98c9e NB |
371 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
372 | rc = -EINVAL; | |
05d1c7c0 AG |
373 | goto out; |
374 | } | |
c66ac9db NB |
375 | } |
376 | ||
377 | ptr += 4; | |
378 | len += 4; | |
379 | } | |
380 | ||
05d1c7c0 | 381 | out: |
4949314c | 382 | transport_kunmap_data_sg(cmd); |
59e4f541 RD |
383 | if (!rc) |
384 | target_complete_cmd(cmd, GOOD); | |
385 | return rc; | |
c66ac9db NB |
386 | } |
387 | ||
388 | static inline int core_alua_state_nonoptimized( | |
389 | struct se_cmd *cmd, | |
390 | unsigned char *cdb, | |
391 | int nonop_delay_msecs, | |
392 | u8 *alua_ascq) | |
393 | { | |
394 | /* | |
395 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
396 | * later to determine if processing of this cmd needs to be | |
397 | * temporarily delayed for the Active/NonOptimized primary access state. | |
398 | */ | |
399 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
400 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static inline int core_alua_state_standby( | |
405 | struct se_cmd *cmd, | |
406 | unsigned char *cdb, | |
407 | u8 *alua_ascq) | |
408 | { | |
409 | /* | |
410 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
411 | * spc4r17 section 5.9.2.4.4 | |
412 | */ | |
413 | switch (cdb[0]) { | |
414 | case INQUIRY: | |
415 | case LOG_SELECT: | |
416 | case LOG_SENSE: | |
417 | case MODE_SELECT: | |
418 | case MODE_SENSE: | |
419 | case REPORT_LUNS: | |
420 | case RECEIVE_DIAGNOSTIC: | |
421 | case SEND_DIAGNOSTIC: | |
422 | case MAINTENANCE_IN: | |
ba539743 | 423 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
424 | case MI_REPORT_TARGET_PGS: |
425 | return 0; | |
426 | default: | |
427 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
428 | return 1; | |
429 | } | |
430 | case MAINTENANCE_OUT: | |
431 | switch (cdb[1]) { | |
432 | case MO_SET_TARGET_PGS: | |
433 | return 0; | |
434 | default: | |
435 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
436 | return 1; | |
437 | } | |
438 | case REQUEST_SENSE: | |
439 | case PERSISTENT_RESERVE_IN: | |
440 | case PERSISTENT_RESERVE_OUT: | |
441 | case READ_BUFFER: | |
442 | case WRITE_BUFFER: | |
443 | return 0; | |
444 | default: | |
445 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
446 | return 1; | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static inline int core_alua_state_unavailable( | |
453 | struct se_cmd *cmd, | |
454 | unsigned char *cdb, | |
455 | u8 *alua_ascq) | |
456 | { | |
457 | /* | |
458 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
459 | * spc4r17 section 5.9.2.4.5 | |
460 | */ | |
461 | switch (cdb[0]) { | |
462 | case INQUIRY: | |
463 | case REPORT_LUNS: | |
464 | case MAINTENANCE_IN: | |
ba539743 | 465 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
466 | case MI_REPORT_TARGET_PGS: |
467 | return 0; | |
468 | default: | |
469 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
470 | return 1; | |
471 | } | |
472 | case MAINTENANCE_OUT: | |
473 | switch (cdb[1]) { | |
474 | case MO_SET_TARGET_PGS: | |
475 | return 0; | |
476 | default: | |
477 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
478 | return 1; | |
479 | } | |
480 | case REQUEST_SENSE: | |
481 | case READ_BUFFER: | |
482 | case WRITE_BUFFER: | |
483 | return 0; | |
484 | default: | |
485 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
486 | return 1; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static inline int core_alua_state_transition( | |
493 | struct se_cmd *cmd, | |
494 | unsigned char *cdb, | |
495 | u8 *alua_ascq) | |
496 | { | |
497 | /* | |
498 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
499 | * spc4r17 section 5.9.2.5 | |
500 | */ | |
501 | switch (cdb[0]) { | |
502 | case INQUIRY: | |
503 | case REPORT_LUNS: | |
504 | case MAINTENANCE_IN: | |
ba539743 | 505 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
506 | case MI_REPORT_TARGET_PGS: |
507 | return 0; | |
508 | default: | |
509 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
510 | return 1; | |
511 | } | |
512 | case REQUEST_SENSE: | |
513 | case READ_BUFFER: | |
514 | case WRITE_BUFFER: | |
515 | return 0; | |
516 | default: | |
517 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
518 | return 1; | |
519 | } | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | /* | |
c66ac9db NB |
525 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
526 | * return 0: Used to signal success | |
527 | * reutrn -1: Used to signal failure, and invalid cdb field | |
528 | */ | |
c87fbd56 | 529 | int target_alua_state_check(struct se_cmd *cmd) |
c66ac9db | 530 | { |
c87fbd56 CH |
531 | struct se_device *dev = cmd->se_dev; |
532 | unsigned char *cdb = cmd->t_task_cdb; | |
e3d6f909 | 533 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
534 | struct se_port *port = lun->lun_sep; |
535 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
536 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
537 | int out_alua_state, nonop_delay_msecs; | |
c87fbd56 CH |
538 | u8 alua_ascq; |
539 | int ret; | |
540 | ||
541 | if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) | |
542 | return 0; | |
543 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) | |
544 | return 0; | |
c66ac9db | 545 | |
6708bb27 | 546 | if (!port) |
c66ac9db NB |
547 | return 0; |
548 | /* | |
549 | * First, check for a struct se_port specific secondary ALUA target port | |
550 | * access state: OFFLINE | |
551 | */ | |
552 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
6708bb27 | 553 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db | 554 | " target port\n"); |
c87fbd56 CH |
555 | alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
556 | ret = 1; | |
557 | goto out; | |
c66ac9db NB |
558 | } |
559 | /* | |
560 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
561 | * ALUA target port group, to obtain current ALUA access state. | |
562 | * Otherwise look for the underlying struct se_device association with | |
563 | * a ALUA logical unit group. | |
564 | */ | |
565 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
566 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
567 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
568 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
569 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
570 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
571 | /* | |
25985edc LDM |
572 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
573 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
574 | * For the Optimized ALUA access state case, we want to process the |
575 | * incoming fabric cmd ASAP.. | |
576 | */ | |
577 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
578 | return 0; | |
579 | ||
580 | switch (out_alua_state) { | |
581 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
c87fbd56 CH |
582 | ret = core_alua_state_nonoptimized(cmd, cdb, |
583 | nonop_delay_msecs, &alua_ascq); | |
584 | break; | |
c66ac9db | 585 | case ALUA_ACCESS_STATE_STANDBY: |
c87fbd56 CH |
586 | ret = core_alua_state_standby(cmd, cdb, &alua_ascq); |
587 | break; | |
c66ac9db | 588 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
c87fbd56 CH |
589 | ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); |
590 | break; | |
c66ac9db | 591 | case ALUA_ACCESS_STATE_TRANSITION: |
c87fbd56 CH |
592 | ret = core_alua_state_transition(cmd, cdb, &alua_ascq); |
593 | break; | |
c66ac9db NB |
594 | /* |
595 | * OFFLINE is a secondary ALUA target port group access state, that is | |
596 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
597 | */ | |
598 | case ALUA_ACCESS_STATE_OFFLINE: | |
599 | default: | |
6708bb27 | 600 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 601 | out_alua_state); |
c87fbd56 CH |
602 | ret = -EINVAL; |
603 | break; | |
c66ac9db NB |
604 | } |
605 | ||
c87fbd56 CH |
606 | out: |
607 | if (ret > 0) { | |
608 | /* | |
609 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; | |
610 | * The ALUA additional sense code qualifier (ASCQ) is determined | |
611 | * by the ALUA primary or secondary access state.. | |
612 | */ | |
613 | pr_debug("[%s]: ALUA TG Port not available, " | |
614 | "SenseKey: NOT_READY, ASC/ASCQ: " | |
615 | "0x04/0x%02x\n", | |
616 | cmd->se_tfo->get_fabric_name(), alua_ascq); | |
617 | ||
618 | cmd->scsi_asc = 0x04; | |
619 | cmd->scsi_ascq = alua_ascq; | |
620 | } | |
621 | ||
622 | return ret; | |
c66ac9db NB |
623 | } |
624 | ||
625 | /* | |
626 | * Check implict and explict ALUA state change request. | |
627 | */ | |
628 | static int core_alua_check_transition(int state, int *primary) | |
629 | { | |
630 | switch (state) { | |
631 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
632 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
633 | case ALUA_ACCESS_STATE_STANDBY: | |
634 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
635 | /* | |
636 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
637 | * defined as primary target port asymmetric access states. | |
638 | */ | |
639 | *primary = 1; | |
640 | break; | |
641 | case ALUA_ACCESS_STATE_OFFLINE: | |
642 | /* | |
643 | * OFFLINE state is defined as a secondary target port | |
644 | * asymmetric access state. | |
645 | */ | |
646 | *primary = 0; | |
647 | break; | |
648 | default: | |
6708bb27 | 649 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
e3d6f909 | 650 | return -EINVAL; |
c66ac9db NB |
651 | } |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | static char *core_alua_dump_state(int state) | |
657 | { | |
658 | switch (state) { | |
659 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
660 | return "Active/Optimized"; | |
661 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
662 | return "Active/NonOptimized"; | |
663 | case ALUA_ACCESS_STATE_STANDBY: | |
664 | return "Standby"; | |
665 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
666 | return "Unavailable"; | |
667 | case ALUA_ACCESS_STATE_OFFLINE: | |
668 | return "Offline"; | |
669 | default: | |
670 | return "Unknown"; | |
671 | } | |
672 | ||
673 | return NULL; | |
674 | } | |
675 | ||
676 | char *core_alua_dump_status(int status) | |
677 | { | |
678 | switch (status) { | |
679 | case ALUA_STATUS_NONE: | |
680 | return "None"; | |
681 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
682 | return "Altered by Explict STPG"; | |
683 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
684 | return "Altered by Implict ALUA"; | |
685 | default: | |
686 | return "Unknown"; | |
687 | } | |
688 | ||
689 | return NULL; | |
690 | } | |
691 | ||
692 | /* | |
693 | * Used by fabric modules to determine when we need to delay processing | |
694 | * for the Active/NonOptimized paths.. | |
695 | */ | |
696 | int core_alua_check_nonop_delay( | |
697 | struct se_cmd *cmd) | |
698 | { | |
699 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
700 | return 0; | |
701 | if (in_interrupt()) | |
702 | return 0; | |
703 | /* | |
704 | * The ALUA Active/NonOptimized access state delay can be disabled | |
705 | * in via configfs with a value of zero | |
706 | */ | |
6708bb27 | 707 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
708 | return 0; |
709 | /* | |
710 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
711 | * defined interval in core_alua_state_nonoptimized() | |
712 | */ | |
713 | msleep_interruptible(cmd->alua_nonop_delay); | |
714 | return 0; | |
715 | } | |
716 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
717 | ||
718 | /* | |
719 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
720 | * | |
721 | */ | |
722 | static int core_alua_write_tpg_metadata( | |
723 | const char *path, | |
724 | unsigned char *md_buf, | |
725 | u32 md_buf_len) | |
726 | { | |
727 | mm_segment_t old_fs; | |
728 | struct file *file; | |
729 | struct iovec iov[1]; | |
730 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; | |
731 | ||
732 | memset(iov, 0, sizeof(struct iovec)); | |
733 | ||
734 | file = filp_open(path, flags, 0600); | |
735 | if (IS_ERR(file) || !file || !file->f_dentry) { | |
6708bb27 | 736 | pr_err("filp_open(%s) for ALUA metadata failed\n", |
c66ac9db NB |
737 | path); |
738 | return -ENODEV; | |
739 | } | |
740 | ||
741 | iov[0].iov_base = &md_buf[0]; | |
742 | iov[0].iov_len = md_buf_len; | |
743 | ||
744 | old_fs = get_fs(); | |
745 | set_fs(get_ds()); | |
746 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); | |
747 | set_fs(old_fs); | |
748 | ||
749 | if (ret < 0) { | |
6708bb27 | 750 | pr_err("Error writing ALUA metadata file: %s\n", path); |
c66ac9db NB |
751 | filp_close(file, NULL); |
752 | return -EIO; | |
753 | } | |
754 | filp_close(file, NULL); | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
759 | /* | |
760 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
761 | */ | |
762 | static int core_alua_update_tpg_primary_metadata( | |
763 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
764 | int primary_state, | |
765 | unsigned char *md_buf) | |
766 | { | |
0fd97ccf | 767 | struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; |
c66ac9db NB |
768 | char path[ALUA_METADATA_PATH_LEN]; |
769 | int len; | |
770 | ||
771 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
772 | ||
773 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
774 | "tg_pt_gp_id=%hu\n" | |
775 | "alua_access_state=0x%02x\n" | |
776 | "alua_access_status=0x%02x\n", | |
777 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
778 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
779 | ||
780 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
781 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
782 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
783 | ||
784 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
785 | } | |
786 | ||
787 | static int core_alua_do_transition_tg_pt( | |
788 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
789 | struct se_port *l_port, | |
790 | struct se_node_acl *nacl, | |
791 | unsigned char *md_buf, | |
792 | int new_state, | |
793 | int explict) | |
794 | { | |
795 | struct se_dev_entry *se_deve; | |
796 | struct se_lun_acl *lacl; | |
797 | struct se_port *port; | |
798 | struct t10_alua_tg_pt_gp_member *mem; | |
799 | int old_state = 0; | |
800 | /* | |
801 | * Save the old primary ALUA access state, and set the current state | |
802 | * to ALUA_ACCESS_STATE_TRANSITION. | |
803 | */ | |
804 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
805 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
806 | ALUA_ACCESS_STATE_TRANSITION); | |
807 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
808 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
809 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
810 | /* | |
811 | * Check for the optional ALUA primary state transition delay | |
812 | */ | |
813 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
814 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
815 | ||
816 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
817 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
818 | tg_pt_gp_mem_list) { | |
819 | port = mem->tg_pt; | |
820 | /* | |
821 | * After an implicit target port asymmetric access state | |
822 | * change, a device server shall establish a unit attention | |
823 | * condition for the initiator port associated with every I_T | |
824 | * nexus with the additional sense code set to ASYMMETRIC | |
825 | * ACCESS STATE CHAGED. | |
826 | * | |
827 | * After an explicit target port asymmetric access state | |
828 | * change, a device server shall establish a unit attention | |
829 | * condition with the additional sense code set to ASYMMETRIC | |
830 | * ACCESS STATE CHANGED for the initiator port associated with | |
831 | * every I_T nexus other than the I_T nexus on which the SET | |
832 | * TARGET PORT GROUPS command | |
833 | */ | |
834 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
835 | smp_mb__after_atomic_inc(); | |
836 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
837 | ||
838 | spin_lock_bh(&port->sep_alua_lock); | |
839 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
840 | alua_port_list) { | |
841 | lacl = se_deve->se_lun_acl; | |
842 | /* | |
843 | * se_deve->se_lun_acl pointer may be NULL for a | |
844 | * entry created without explict Node+MappedLUN ACLs | |
845 | */ | |
6708bb27 | 846 | if (!lacl) |
c66ac9db NB |
847 | continue; |
848 | ||
849 | if (explict && | |
850 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
851 | (l_port != NULL) && (l_port == port)) | |
852 | continue; | |
853 | ||
854 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
855 | se_deve->mapped_lun, 0x2A, | |
856 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
857 | } | |
858 | spin_unlock_bh(&port->sep_alua_lock); | |
859 | ||
860 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
861 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
862 | smp_mb__after_atomic_dec(); | |
863 | } | |
864 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
865 | /* | |
866 | * Update the ALUA metadata buf that has been allocated in | |
867 | * core_alua_do_port_transition(), this metadata will be written | |
868 | * to struct file. | |
869 | * | |
870 | * Note that there is the case where we do not want to update the | |
871 | * metadata when the saved metadata is being parsed in userspace | |
872 | * when setting the existing port access state and access status. | |
873 | * | |
874 | * Also note that the failure to write out the ALUA metadata to | |
875 | * struct file does NOT affect the actual ALUA transition. | |
876 | */ | |
877 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
878 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
879 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
880 | new_state, md_buf); | |
881 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
882 | } | |
883 | /* | |
884 | * Set the current primary ALUA access state to the requested new state | |
885 | */ | |
886 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
887 | ||
6708bb27 | 888 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
889 | " from primary access state %s to %s\n", (explict) ? "explict" : |
890 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
891 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
892 | core_alua_dump_state(new_state)); | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | int core_alua_do_port_transition( | |
898 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
899 | struct se_device *l_dev, | |
900 | struct se_port *l_port, | |
901 | struct se_node_acl *l_nacl, | |
902 | int new_state, | |
903 | int explict) | |
904 | { | |
905 | struct se_device *dev; | |
906 | struct se_port *port; | |
c66ac9db NB |
907 | struct se_node_acl *nacl; |
908 | struct t10_alua_lu_gp *lu_gp; | |
909 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
910 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
911 | unsigned char *md_buf; | |
912 | int primary; | |
913 | ||
914 | if (core_alua_check_transition(new_state, &primary) != 0) | |
915 | return -EINVAL; | |
916 | ||
917 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
918 | if (!md_buf) { |
919 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
920 | return -ENOMEM; |
921 | } | |
922 | ||
923 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
924 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
925 | lu_gp = local_lu_gp_mem->lu_gp; | |
926 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
927 | smp_mb__after_atomic_inc(); | |
928 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
929 | /* | |
930 | * For storage objects that are members of the 'default_lu_gp', | |
931 | * we only do transition on the passed *l_tp_pt_gp, and not | |
932 | * on all of the matching target port groups IDs in default_lu_gp. | |
933 | */ | |
6708bb27 | 934 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
935 | /* |
936 | * core_alua_do_transition_tg_pt() will always return | |
937 | * success. | |
938 | */ | |
939 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
940 | md_buf, new_state, explict); | |
941 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
942 | smp_mb__after_atomic_dec(); | |
943 | kfree(md_buf); | |
944 | return 0; | |
945 | } | |
946 | /* | |
947 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
948 | * the associated storage objects looking for a matching target port | |
949 | * group ID from the local target port group. | |
950 | */ | |
951 | spin_lock(&lu_gp->lu_gp_lock); | |
952 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
953 | lu_gp_mem_list) { | |
954 | ||
955 | dev = lu_gp_mem->lu_gp_mem_dev; | |
c66ac9db NB |
956 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
957 | smp_mb__after_atomic_inc(); | |
958 | spin_unlock(&lu_gp->lu_gp_lock); | |
959 | ||
0fd97ccf | 960 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 961 | list_for_each_entry(tg_pt_gp, |
0fd97ccf | 962 | &dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
963 | tg_pt_gp_list) { |
964 | ||
6708bb27 | 965 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
966 | continue; |
967 | /* | |
968 | * If the target behavior port asymmetric access state | |
969 | * is changed for any target port group accessiable via | |
970 | * a logical unit within a LU group, the target port | |
971 | * behavior group asymmetric access states for the same | |
972 | * target port group accessible via other logical units | |
973 | * in that LU group will also change. | |
974 | */ | |
975 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
976 | continue; | |
977 | ||
978 | if (l_tg_pt_gp == tg_pt_gp) { | |
979 | port = l_port; | |
980 | nacl = l_nacl; | |
981 | } else { | |
982 | port = NULL; | |
983 | nacl = NULL; | |
984 | } | |
985 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
986 | smp_mb__after_atomic_inc(); | |
0fd97ccf | 987 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
988 | /* |
989 | * core_alua_do_transition_tg_pt() will always return | |
990 | * success. | |
991 | */ | |
992 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
993 | nacl, md_buf, new_state, explict); | |
994 | ||
0fd97ccf | 995 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
996 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
997 | smp_mb__after_atomic_dec(); | |
998 | } | |
0fd97ccf | 999 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1000 | |
1001 | spin_lock(&lu_gp->lu_gp_lock); | |
1002 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
1003 | smp_mb__after_atomic_dec(); | |
1004 | } | |
1005 | spin_unlock(&lu_gp->lu_gp_lock); | |
1006 | ||
6708bb27 | 1007 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
1008 | " Group IDs: %hu %s transition to primary state: %s\n", |
1009 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
1010 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
1011 | core_alua_dump_state(new_state)); | |
1012 | ||
1013 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
1014 | smp_mb__after_atomic_dec(); | |
1015 | kfree(md_buf); | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
1021 | */ | |
1022 | static int core_alua_update_tpg_secondary_metadata( | |
1023 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1024 | struct se_port *port, | |
1025 | unsigned char *md_buf, | |
1026 | u32 md_buf_len) | |
1027 | { | |
1028 | struct se_portal_group *se_tpg = port->sep_tpg; | |
1029 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
1030 | int len; | |
1031 | ||
1032 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
1033 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
1034 | ||
1035 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 1036 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 1037 | |
e3d6f909 | 1038 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 1039 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 1040 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
1041 | |
1042 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
1043 | "alua_tg_pt_status=0x%02x\n", | |
1044 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
1045 | port->sep_tg_pt_secondary_stat); | |
1046 | ||
1047 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 1048 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
1049 | port->sep_lun->unpacked_lun); |
1050 | ||
1051 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
1052 | } | |
1053 | ||
1054 | static int core_alua_set_tg_pt_secondary_state( | |
1055 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1056 | struct se_port *port, | |
1057 | int explict, | |
1058 | int offline) | |
1059 | { | |
1060 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1061 | unsigned char *md_buf; | |
1062 | u32 md_buf_len; | |
1063 | int trans_delay_msecs; | |
1064 | ||
1065 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1066 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1067 | if (!tg_pt_gp) { |
c66ac9db | 1068 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1069 | pr_err("Unable to complete secondary state" |
c66ac9db | 1070 | " transition\n"); |
e3d6f909 | 1071 | return -EINVAL; |
c66ac9db NB |
1072 | } |
1073 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1074 | /* | |
1075 | * Set the secondary ALUA target port access state to OFFLINE | |
1076 | * or release the previously secondary state for struct se_port | |
1077 | */ | |
1078 | if (offline) | |
1079 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1080 | else | |
1081 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1082 | ||
1083 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1084 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1085 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1086 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1087 | ||
6708bb27 | 1088 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1089 | " to secondary access state: %s\n", (explict) ? "explict" : |
1090 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1091 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1092 | ||
1093 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1094 | /* | |
1095 | * Do the optional transition delay after we set the secondary | |
1096 | * ALUA access state. | |
1097 | */ | |
1098 | if (trans_delay_msecs != 0) | |
1099 | msleep_interruptible(trans_delay_msecs); | |
1100 | /* | |
1101 | * See if we need to update the ALUA fabric port metadata for | |
1102 | * secondary state and status | |
1103 | */ | |
1104 | if (port->sep_tg_pt_secondary_write_md) { | |
1105 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1106 | if (!md_buf) { |
1107 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1108 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1109 | return -ENOMEM; |
c66ac9db NB |
1110 | } |
1111 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1112 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1113 | md_buf, md_buf_len); | |
1114 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1115 | ||
1116 | kfree(md_buf); | |
1117 | } | |
1118 | ||
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | struct t10_alua_lu_gp * | |
1123 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1124 | { | |
1125 | struct t10_alua_lu_gp *lu_gp; | |
1126 | ||
1127 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1128 | if (!lu_gp) { |
1129 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1130 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1131 | } |
e3d6f909 | 1132 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1133 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1134 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1135 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1136 | ||
1137 | if (def_group) { | |
e3d6f909 | 1138 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1139 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1140 | alua_lu_gps_count++; |
c66ac9db NB |
1141 | } |
1142 | ||
1143 | return lu_gp; | |
1144 | } | |
1145 | ||
1146 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1147 | { | |
1148 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1149 | u16 lu_gp_id_tmp; | |
1150 | /* | |
1151 | * The lu_gp->lu_gp_id may only be set once.. | |
1152 | */ | |
1153 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1154 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1155 | " ignoring request\n"); |
e3d6f909 | 1156 | return -EINVAL; |
c66ac9db NB |
1157 | } |
1158 | ||
e3d6f909 AG |
1159 | spin_lock(&lu_gps_lock); |
1160 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1161 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1162 | " 0x0000ffff reached\n"); |
e3d6f909 | 1163 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1164 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1165 | return -ENOSPC; |
c66ac9db NB |
1166 | } |
1167 | again: | |
1168 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1169 | alua_lu_gps_counter++; |
c66ac9db | 1170 | |
e3d6f909 | 1171 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1172 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1173 | if (!lu_gp_id) |
c66ac9db NB |
1174 | goto again; |
1175 | ||
6708bb27 | 1176 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1177 | " already exists, ignoring request\n", |
1178 | lu_gp_id); | |
e3d6f909 AG |
1179 | spin_unlock(&lu_gps_lock); |
1180 | return -EINVAL; | |
c66ac9db NB |
1181 | } |
1182 | } | |
1183 | ||
1184 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1185 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1186 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1187 | alua_lu_gps_count++; | |
1188 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1189 | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static struct t10_alua_lu_gp_member * | |
1194 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1195 | { | |
1196 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1197 | ||
1198 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1199 | if (!lu_gp_mem) { |
1200 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1201 | return ERR_PTR(-ENOMEM); |
1202 | } | |
1203 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1204 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1205 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1206 | ||
1207 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1208 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1209 | ||
1210 | return lu_gp_mem; | |
1211 | } | |
1212 | ||
1213 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1214 | { | |
1215 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1216 | /* | |
1217 | * Once we have reached this point, config_item_put() has | |
1218 | * already been called from target_core_alua_drop_lu_gp(). | |
1219 | * | |
1220 | * Here, we remove the *lu_gp from the global list so that | |
1221 | * no associations can be made while we are releasing | |
1222 | * struct t10_alua_lu_gp. | |
1223 | */ | |
e3d6f909 | 1224 | spin_lock(&lu_gps_lock); |
e3d6f909 AG |
1225 | list_del(&lu_gp->lu_gp_node); |
1226 | alua_lu_gps_count--; | |
1227 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1228 | /* |
1229 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1230 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1231 | * released with core_alua_put_lu_gp_from_name() | |
1232 | */ | |
1233 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1234 | cpu_relax(); | |
1235 | /* | |
1236 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1237 | * struct se_device. | |
1238 | */ | |
1239 | spin_lock(&lu_gp->lu_gp_lock); | |
1240 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1241 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1242 | if (lu_gp_mem->lu_gp_assoc) { | |
1243 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1244 | lu_gp->lu_gp_members--; | |
1245 | lu_gp_mem->lu_gp_assoc = 0; | |
1246 | } | |
1247 | spin_unlock(&lu_gp->lu_gp_lock); | |
1248 | /* | |
1249 | * | |
25985edc | 1250 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1251 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1252 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1253 | * | |
1254 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1255 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1256 | */ | |
1257 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1258 | if (lu_gp != default_lu_gp) |
c66ac9db | 1259 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1260 | default_lu_gp); |
c66ac9db NB |
1261 | else |
1262 | lu_gp_mem->lu_gp = NULL; | |
1263 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1264 | ||
1265 | spin_lock(&lu_gp->lu_gp_lock); | |
1266 | } | |
1267 | spin_unlock(&lu_gp->lu_gp_lock); | |
1268 | ||
1269 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1270 | } | |
1271 | ||
1272 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1273 | { | |
c66ac9db NB |
1274 | struct t10_alua_lu_gp *lu_gp; |
1275 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1276 | ||
c66ac9db | 1277 | lu_gp_mem = dev->dev_alua_lu_gp_mem; |
6708bb27 | 1278 | if (!lu_gp_mem) |
c66ac9db NB |
1279 | return; |
1280 | ||
1281 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1282 | cpu_relax(); | |
1283 | ||
1284 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1285 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1286 | if (lu_gp) { |
c66ac9db NB |
1287 | spin_lock(&lu_gp->lu_gp_lock); |
1288 | if (lu_gp_mem->lu_gp_assoc) { | |
1289 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1290 | lu_gp->lu_gp_members--; | |
1291 | lu_gp_mem->lu_gp_assoc = 0; | |
1292 | } | |
1293 | spin_unlock(&lu_gp->lu_gp_lock); | |
1294 | lu_gp_mem->lu_gp = NULL; | |
1295 | } | |
1296 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1297 | ||
1298 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1299 | } | |
1300 | ||
1301 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1302 | { | |
1303 | struct t10_alua_lu_gp *lu_gp; | |
1304 | struct config_item *ci; | |
1305 | ||
e3d6f909 AG |
1306 | spin_lock(&lu_gps_lock); |
1307 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1308 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1309 | continue; |
1310 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1311 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1312 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1313 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1314 | return lu_gp; |
1315 | } | |
1316 | } | |
e3d6f909 | 1317 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1318 | |
1319 | return NULL; | |
1320 | } | |
1321 | ||
1322 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1323 | { | |
e3d6f909 | 1324 | spin_lock(&lu_gps_lock); |
c66ac9db | 1325 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1326 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1327 | } |
1328 | ||
1329 | /* | |
1330 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1331 | */ | |
1332 | void __core_alua_attach_lu_gp_mem( | |
1333 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1334 | struct t10_alua_lu_gp *lu_gp) | |
1335 | { | |
1336 | spin_lock(&lu_gp->lu_gp_lock); | |
1337 | lu_gp_mem->lu_gp = lu_gp; | |
1338 | lu_gp_mem->lu_gp_assoc = 1; | |
1339 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1340 | lu_gp->lu_gp_members++; | |
1341 | spin_unlock(&lu_gp->lu_gp_lock); | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1346 | */ | |
1347 | void __core_alua_drop_lu_gp_mem( | |
1348 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1349 | struct t10_alua_lu_gp *lu_gp) | |
1350 | { | |
1351 | spin_lock(&lu_gp->lu_gp_lock); | |
1352 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1353 | lu_gp_mem->lu_gp = NULL; | |
1354 | lu_gp_mem->lu_gp_assoc = 0; | |
1355 | lu_gp->lu_gp_members--; | |
1356 | spin_unlock(&lu_gp->lu_gp_lock); | |
1357 | } | |
1358 | ||
0fd97ccf CH |
1359 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, |
1360 | const char *name, int def_group) | |
c66ac9db NB |
1361 | { |
1362 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1363 | ||
1364 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1365 | if (!tg_pt_gp) { |
1366 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1367 | return NULL; |
1368 | } | |
1369 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1370 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1371 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1372 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1373 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
0fd97ccf | 1374 | tg_pt_gp->tg_pt_gp_dev = dev; |
c66ac9db NB |
1375 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
1376 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1377 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1378 | /* | |
1379 | * Enable both explict and implict ALUA support by default | |
1380 | */ | |
1381 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1382 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1383 | /* | |
1384 | * Set the default Active/NonOptimized Delay in milliseconds | |
1385 | */ | |
1386 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1387 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
5b9a4d72 | 1388 | tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; |
c66ac9db NB |
1389 | |
1390 | if (def_group) { | |
0fd97ccf | 1391 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1392 | tg_pt_gp->tg_pt_gp_id = |
0fd97ccf | 1393 | dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1394 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
0fd97ccf | 1395 | dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1396 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
0fd97ccf CH |
1397 | &dev->t10_alua.tg_pt_gps_list); |
1398 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1399 | } |
1400 | ||
1401 | return tg_pt_gp; | |
1402 | } | |
1403 | ||
1404 | int core_alua_set_tg_pt_gp_id( | |
1405 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1406 | u16 tg_pt_gp_id) | |
1407 | { | |
0fd97ccf | 1408 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db NB |
1409 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
1410 | u16 tg_pt_gp_id_tmp; | |
0fd97ccf | 1411 | |
c66ac9db NB |
1412 | /* |
1413 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1414 | */ | |
1415 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1416 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1417 | " ignoring request\n"); |
e3d6f909 | 1418 | return -EINVAL; |
c66ac9db NB |
1419 | } |
1420 | ||
0fd97ccf CH |
1421 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
1422 | if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1423 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1424 | " 0x0000ffff reached\n"); |
0fd97ccf | 1425 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1426 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1427 | return -ENOSPC; |
c66ac9db NB |
1428 | } |
1429 | again: | |
1430 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
0fd97ccf | 1431 | dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1432 | |
0fd97ccf | 1433 | list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1434 | tg_pt_gp_list) { |
1435 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1436 | if (!tg_pt_gp_id) |
c66ac9db NB |
1437 | goto again; |
1438 | ||
6708bb27 | 1439 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1440 | " exists, ignoring request\n", tg_pt_gp_id); |
0fd97ccf | 1441 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
e3d6f909 | 1442 | return -EINVAL; |
c66ac9db NB |
1443 | } |
1444 | } | |
1445 | ||
1446 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1447 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1448 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
0fd97ccf CH |
1449 | &dev->t10_alua.tg_pt_gps_list); |
1450 | dev->t10_alua.alua_tg_pt_gps_count++; | |
1451 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1452 | |
1453 | return 0; | |
1454 | } | |
1455 | ||
1456 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1457 | struct se_port *port) | |
1458 | { | |
1459 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1460 | ||
1461 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1462 | GFP_KERNEL); | |
6708bb27 AG |
1463 | if (!tg_pt_gp_mem) { |
1464 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1465 | return ERR_PTR(-ENOMEM); |
1466 | } | |
1467 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1468 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1469 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1470 | ||
1471 | tg_pt_gp_mem->tg_pt = port; | |
1472 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
c66ac9db NB |
1473 | |
1474 | return tg_pt_gp_mem; | |
1475 | } | |
1476 | ||
1477 | void core_alua_free_tg_pt_gp( | |
1478 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1479 | { | |
0fd97ccf | 1480 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db | 1481 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
0fd97ccf | 1482 | |
c66ac9db NB |
1483 | /* |
1484 | * Once we have reached this point, config_item_put() has already | |
1485 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1486 | * | |
1487 | * Here we remove *tg_pt_gp from the global list so that | |
1488 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1489 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1490 | */ | |
0fd97ccf | 1491 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1492 | list_del(&tg_pt_gp->tg_pt_gp_list); |
0fd97ccf CH |
1493 | dev->t10_alua.alua_tg_pt_gps_counter--; |
1494 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
1495 | ||
c66ac9db NB |
1496 | /* |
1497 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1498 | * core_alua_get_tg_pt_gp_by_name() in | |
1499 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1500 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1501 | */ | |
1502 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1503 | cpu_relax(); | |
0fd97ccf | 1504 | |
c66ac9db NB |
1505 | /* |
1506 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1507 | * struct se_port. | |
1508 | */ | |
1509 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1510 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1511 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1512 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1513 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1514 | tg_pt_gp->tg_pt_gp_members--; | |
1515 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1516 | } | |
1517 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1518 | /* | |
25985edc | 1519 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1520 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1521 | * core_alua_free_tg_pt_gp_mem(). | |
1522 | * | |
1523 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1524 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1525 | * default_tg_pt_gp. | |
1526 | */ | |
1527 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
0fd97ccf | 1528 | if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1529 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
0fd97ccf | 1530 | dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1531 | } else |
1532 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1533 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1534 | ||
1535 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1536 | } | |
1537 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1538 | ||
1539 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1540 | } | |
1541 | ||
1542 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1543 | { | |
c66ac9db NB |
1544 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1545 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1546 | ||
c66ac9db | 1547 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
6708bb27 | 1548 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1549 | return; |
1550 | ||
1551 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1552 | cpu_relax(); | |
1553 | ||
1554 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1555 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1556 | if (tg_pt_gp) { |
c66ac9db NB |
1557 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1558 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1559 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1560 | tg_pt_gp->tg_pt_gp_members--; | |
1561 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1562 | } | |
1563 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1564 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1565 | } | |
1566 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1567 | ||
1568 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1569 | } | |
1570 | ||
1571 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
0fd97ccf | 1572 | struct se_device *dev, const char *name) |
c66ac9db NB |
1573 | { |
1574 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1575 | struct config_item *ci; | |
1576 | ||
0fd97ccf CH |
1577 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
1578 | list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1579 | tg_pt_gp_list) { |
6708bb27 | 1580 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1581 | continue; |
1582 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1583 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1584 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
0fd97ccf | 1585 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1586 | return tg_pt_gp; |
1587 | } | |
1588 | } | |
0fd97ccf | 1589 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1590 | |
1591 | return NULL; | |
1592 | } | |
1593 | ||
1594 | static void core_alua_put_tg_pt_gp_from_name( | |
1595 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1596 | { | |
0fd97ccf | 1597 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db | 1598 | |
0fd97ccf | 1599 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1600 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
0fd97ccf | 1601 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1602 | } |
1603 | ||
1604 | /* | |
1605 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1606 | */ | |
1607 | void __core_alua_attach_tg_pt_gp_mem( | |
1608 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1609 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1610 | { | |
1611 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1612 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1613 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1614 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1615 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1616 | tg_pt_gp->tg_pt_gp_members++; | |
1617 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1622 | */ | |
1623 | static void __core_alua_drop_tg_pt_gp_mem( | |
1624 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1625 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1626 | { | |
1627 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1628 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1629 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1630 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1631 | tg_pt_gp->tg_pt_gp_members--; | |
1632 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1633 | } | |
1634 | ||
1635 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1636 | { | |
c66ac9db | 1637 | struct config_item *tg_pt_ci; |
c66ac9db NB |
1638 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1639 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1640 | ssize_t len = 0; | |
1641 | ||
c66ac9db | 1642 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
6708bb27 | 1643 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1644 | return len; |
1645 | ||
1646 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1647 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1648 | if (tg_pt_gp) { |
c66ac9db NB |
1649 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1650 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1651 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1652 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1653 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1654 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1655 | core_alua_dump_state(atomic_read( | |
1656 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1657 | core_alua_dump_status( | |
1658 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1659 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1660 | "Offline" : "None", | |
1661 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1662 | } | |
1663 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1664 | ||
1665 | return len; | |
1666 | } | |
1667 | ||
1668 | ssize_t core_alua_store_tg_pt_gp_info( | |
1669 | struct se_port *port, | |
1670 | const char *page, | |
1671 | size_t count) | |
1672 | { | |
1673 | struct se_portal_group *tpg; | |
1674 | struct se_lun *lun; | |
0fd97ccf | 1675 | struct se_device *dev = port->sep_lun->lun_se_dev; |
c66ac9db NB |
1676 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
1677 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1678 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1679 | int move = 0; | |
1680 | ||
1681 | tpg = port->sep_tpg; | |
1682 | lun = port->sep_lun; | |
1683 | ||
c87fbd56 CH |
1684 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
1685 | if (!tg_pt_gp_mem) | |
1686 | return 0; | |
c66ac9db NB |
1687 | |
1688 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1689 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1690 | return -EINVAL; |
1691 | } | |
1692 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1693 | memcpy(buf, page, count); | |
1694 | /* | |
1695 | * Any ALUA target port group alias besides "NULL" means we will be | |
1696 | * making a new group association. | |
1697 | */ | |
1698 | if (strcmp(strstrip(buf), "NULL")) { | |
1699 | /* | |
1700 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1701 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1702 | * core_alua_put_tg_pt_gp_from_name() below. | |
1703 | */ | |
0fd97ccf | 1704 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, |
c66ac9db | 1705 | strstrip(buf)); |
6708bb27 | 1706 | if (!tg_pt_gp_new) |
c66ac9db NB |
1707 | return -ENODEV; |
1708 | } | |
c66ac9db NB |
1709 | |
1710 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1711 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1712 | if (tg_pt_gp) { |
c66ac9db NB |
1713 | /* |
1714 | * Clearing an existing tg_pt_gp association, and replacing | |
1715 | * with the default_tg_pt_gp. | |
1716 | */ | |
6708bb27 AG |
1717 | if (!tg_pt_gp_new) { |
1718 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1719 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1720 | " alua/%s, ID: %hu back to" | |
1721 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1722 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1723 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1724 | config_item_name(&lun->lun_group.cg_item), |
1725 | config_item_name( | |
1726 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1727 | tg_pt_gp->tg_pt_gp_id); | |
1728 | ||
1729 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1730 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
0fd97ccf | 1731 | dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1732 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1733 | ||
1734 | return count; | |
1735 | } | |
1736 | /* | |
1737 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1738 | */ | |
1739 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1740 | move = 1; | |
1741 | } | |
1742 | /* | |
1743 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1744 | */ | |
1745 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1746 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1747 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1748 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1749 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1750 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1751 | config_item_name(&lun->lun_group.cg_item), |
1752 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1753 | tg_pt_gp_new->tg_pt_gp_id); | |
1754 | ||
1755 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1756 | return count; | |
1757 | } | |
1758 | ||
1759 | ssize_t core_alua_show_access_type( | |
1760 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1761 | char *page) | |
1762 | { | |
1763 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1764 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1765 | return sprintf(page, "Implict and Explict\n"); | |
1766 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1767 | return sprintf(page, "Implict\n"); | |
1768 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1769 | return sprintf(page, "Explict\n"); | |
1770 | else | |
1771 | return sprintf(page, "None\n"); | |
1772 | } | |
1773 | ||
1774 | ssize_t core_alua_store_access_type( | |
1775 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1776 | const char *page, | |
1777 | size_t count) | |
1778 | { | |
1779 | unsigned long tmp; | |
1780 | int ret; | |
1781 | ||
1782 | ret = strict_strtoul(page, 0, &tmp); | |
1783 | if (ret < 0) { | |
6708bb27 | 1784 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1785 | return -EINVAL; |
1786 | } | |
1787 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1788 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1789 | " %lu\n", tmp); |
1790 | return -EINVAL; | |
1791 | } | |
1792 | if (tmp == 3) | |
1793 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1794 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1795 | else if (tmp == 2) | |
1796 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1797 | else if (tmp == 1) | |
1798 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1799 | else | |
1800 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1801 | ||
1802 | return count; | |
1803 | } | |
1804 | ||
1805 | ssize_t core_alua_show_nonop_delay_msecs( | |
1806 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1807 | char *page) | |
1808 | { | |
1809 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1810 | } | |
1811 | ||
1812 | ssize_t core_alua_store_nonop_delay_msecs( | |
1813 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1814 | const char *page, | |
1815 | size_t count) | |
1816 | { | |
1817 | unsigned long tmp; | |
1818 | int ret; | |
1819 | ||
1820 | ret = strict_strtoul(page, 0, &tmp); | |
1821 | if (ret < 0) { | |
6708bb27 | 1822 | pr_err("Unable to extract nonop_delay_msecs\n"); |
c66ac9db NB |
1823 | return -EINVAL; |
1824 | } | |
1825 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1826 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1827 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1828 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1829 | return -EINVAL; | |
1830 | } | |
1831 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1832 | ||
1833 | return count; | |
1834 | } | |
1835 | ||
1836 | ssize_t core_alua_show_trans_delay_msecs( | |
1837 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1838 | char *page) | |
1839 | { | |
1840 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
1841 | } | |
1842 | ||
1843 | ssize_t core_alua_store_trans_delay_msecs( | |
1844 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1845 | const char *page, | |
1846 | size_t count) | |
1847 | { | |
1848 | unsigned long tmp; | |
1849 | int ret; | |
1850 | ||
1851 | ret = strict_strtoul(page, 0, &tmp); | |
1852 | if (ret < 0) { | |
6708bb27 | 1853 | pr_err("Unable to extract trans_delay_msecs\n"); |
c66ac9db NB |
1854 | return -EINVAL; |
1855 | } | |
1856 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1857 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1858 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1859 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1860 | return -EINVAL; | |
1861 | } | |
1862 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1863 | ||
1864 | return count; | |
1865 | } | |
1866 | ||
5b9a4d72 NB |
1867 | ssize_t core_alua_show_implict_trans_secs( |
1868 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1869 | char *page) | |
1870 | { | |
1871 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); | |
1872 | } | |
1873 | ||
1874 | ssize_t core_alua_store_implict_trans_secs( | |
1875 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1876 | const char *page, | |
1877 | size_t count) | |
1878 | { | |
1879 | unsigned long tmp; | |
1880 | int ret; | |
1881 | ||
1882 | ret = strict_strtoul(page, 0, &tmp); | |
1883 | if (ret < 0) { | |
1884 | pr_err("Unable to extract implict_trans_secs\n"); | |
1885 | return -EINVAL; | |
1886 | } | |
1887 | if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { | |
1888 | pr_err("Passed implict_trans_secs: %lu, exceeds" | |
1889 | " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, | |
1890 | ALUA_MAX_IMPLICT_TRANS_SECS); | |
1891 | return -EINVAL; | |
1892 | } | |
1893 | tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; | |
1894 | ||
1895 | return count; | |
1896 | } | |
1897 | ||
c66ac9db NB |
1898 | ssize_t core_alua_show_preferred_bit( |
1899 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1900 | char *page) | |
1901 | { | |
1902 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1903 | } | |
1904 | ||
1905 | ssize_t core_alua_store_preferred_bit( | |
1906 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1907 | const char *page, | |
1908 | size_t count) | |
1909 | { | |
1910 | unsigned long tmp; | |
1911 | int ret; | |
1912 | ||
1913 | ret = strict_strtoul(page, 0, &tmp); | |
1914 | if (ret < 0) { | |
6708bb27 | 1915 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1916 | return -EINVAL; |
1917 | } | |
1918 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1919 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1920 | return -EINVAL; |
1921 | } | |
1922 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1923 | ||
1924 | return count; | |
1925 | } | |
1926 | ||
1927 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1928 | { | |
6708bb27 | 1929 | if (!lun->lun_sep) |
c66ac9db NB |
1930 | return -ENODEV; |
1931 | ||
1932 | return sprintf(page, "%d\n", | |
1933 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1934 | } | |
1935 | ||
1936 | ssize_t core_alua_store_offline_bit( | |
1937 | struct se_lun *lun, | |
1938 | const char *page, | |
1939 | size_t count) | |
1940 | { | |
1941 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1942 | unsigned long tmp; | |
1943 | int ret; | |
1944 | ||
6708bb27 | 1945 | if (!lun->lun_sep) |
c66ac9db NB |
1946 | return -ENODEV; |
1947 | ||
1948 | ret = strict_strtoul(page, 0, &tmp); | |
1949 | if (ret < 0) { | |
6708bb27 | 1950 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1951 | return -EINVAL; |
1952 | } | |
1953 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1954 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1955 | tmp); |
1956 | return -EINVAL; | |
1957 | } | |
1958 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1959 | if (!tg_pt_gp_mem) { |
1960 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1961 | return -EINVAL; |
1962 | } | |
1963 | ||
1964 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1965 | lun->lun_sep, 0, (int)tmp); | |
1966 | if (ret < 0) | |
1967 | return -EINVAL; | |
1968 | ||
1969 | return count; | |
1970 | } | |
1971 | ||
1972 | ssize_t core_alua_show_secondary_status( | |
1973 | struct se_lun *lun, | |
1974 | char *page) | |
1975 | { | |
1976 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1977 | } | |
1978 | ||
1979 | ssize_t core_alua_store_secondary_status( | |
1980 | struct se_lun *lun, | |
1981 | const char *page, | |
1982 | size_t count) | |
1983 | { | |
1984 | unsigned long tmp; | |
1985 | int ret; | |
1986 | ||
1987 | ret = strict_strtoul(page, 0, &tmp); | |
1988 | if (ret < 0) { | |
6708bb27 | 1989 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
1990 | return -EINVAL; |
1991 | } | |
1992 | if ((tmp != ALUA_STATUS_NONE) && | |
1993 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1994 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 1995 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
1996 | tmp); |
1997 | return -EINVAL; | |
1998 | } | |
1999 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
2000 | ||
2001 | return count; | |
2002 | } | |
2003 | ||
2004 | ssize_t core_alua_show_secondary_write_metadata( | |
2005 | struct se_lun *lun, | |
2006 | char *page) | |
2007 | { | |
2008 | return sprintf(page, "%d\n", | |
2009 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
2010 | } | |
2011 | ||
2012 | ssize_t core_alua_store_secondary_write_metadata( | |
2013 | struct se_lun *lun, | |
2014 | const char *page, | |
2015 | size_t count) | |
2016 | { | |
2017 | unsigned long tmp; | |
2018 | int ret; | |
2019 | ||
2020 | ret = strict_strtoul(page, 0, &tmp); | |
2021 | if (ret < 0) { | |
6708bb27 | 2022 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
2023 | return -EINVAL; |
2024 | } | |
2025 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 2026 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
2027 | " %lu\n", tmp); |
2028 | return -EINVAL; | |
2029 | } | |
2030 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
2031 | ||
2032 | return count; | |
2033 | } | |
2034 | ||
0fd97ccf | 2035 | int core_setup_alua(struct se_device *dev) |
c66ac9db | 2036 | { |
c87fbd56 CH |
2037 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && |
2038 | !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { | |
2039 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
0fd97ccf | 2040 | |
c66ac9db | 2041 | /* |
25985edc | 2042 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
2043 | * LUN Group. |
2044 | */ | |
2045 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
2046 | if (IS_ERR(lu_gp_mem)) |
2047 | return PTR_ERR(lu_gp_mem); | |
c66ac9db | 2048 | |
c66ac9db NB |
2049 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
2050 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2051 | default_lu_gp); |
c66ac9db NB |
2052 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2053 | ||
6708bb27 | 2054 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2055 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2056 | dev->transport->name); |
c66ac9db NB |
2057 | } |
2058 | ||
2059 | return 0; | |
2060 | } |