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 | * | |
fd9a11d7 | 6 | * (c) Copyright 2009-2012 RisingTide Systems LLC. |
c66ac9db NB |
7 | * |
8 | * Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | * | |
24 | ******************************************************************************/ | |
25 | ||
c66ac9db NB |
26 | #include <linux/slab.h> |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/configfs.h> | |
c53181af | 29 | #include <linux/export.h> |
0e9b10a9 | 30 | #include <linux/file.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 | ||
de103c93 | 44 | static sense_reason_t core_alua_check_transition(int state, int *primary); |
c66ac9db NB |
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 | */ | |
de103c93 CH |
62 | sense_reason_t |
63 | target_emulate_report_target_port_groups(struct se_cmd *cmd) | |
c66ac9db | 64 | { |
0fd97ccf | 65 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
66 | struct se_port *port; |
67 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
68 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
05d1c7c0 | 69 | unsigned char *buf; |
5b9a4d72 NB |
70 | u32 rd_len = 0, off; |
71 | int ext_hdr = (cmd->t_task_cdb[1] & 0x20); | |
de103c93 | 72 | |
6b20fa9a | 73 | /* |
5b9a4d72 NB |
74 | * Skip over RESERVED area to first Target port group descriptor |
75 | * depending on the PARAMETER DATA FORMAT type.. | |
6b20fa9a | 76 | */ |
5b9a4d72 NB |
77 | if (ext_hdr != 0) |
78 | off = 8; | |
79 | else | |
80 | off = 4; | |
81 | ||
82 | if (cmd->data_length < off) { | |
83 | pr_warn("REPORT TARGET PORT GROUPS allocation length %u too" | |
84 | " small for %s header\n", cmd->data_length, | |
85 | (ext_hdr) ? "extended" : "normal"); | |
de103c93 | 86 | return TCM_INVALID_CDB_FIELD; |
6b20fa9a | 87 | } |
4949314c | 88 | buf = transport_kmap_data_sg(cmd); |
de103c93 CH |
89 | if (!buf) |
90 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
05d1c7c0 | 91 | |
0fd97ccf CH |
92 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
93 | list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 94 | tg_pt_gp_list) { |
6b20fa9a NB |
95 | /* |
96 | * Check if the Target port group and Target port descriptor list | |
97 | * based on tg_pt_gp_members count will fit into the response payload. | |
98 | * Otherwise, bump rd_len to let the initiator know we have exceeded | |
99 | * the allocation length and the response is truncated. | |
100 | */ | |
101 | if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) > | |
102 | cmd->data_length) { | |
103 | rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4); | |
104 | continue; | |
105 | } | |
c66ac9db NB |
106 | /* |
107 | * PREF: Preferred target port bit, determine if this | |
108 | * bit should be set for port group. | |
109 | */ | |
110 | if (tg_pt_gp->tg_pt_gp_pref) | |
111 | buf[off] = 0x80; | |
112 | /* | |
113 | * Set the ASYMMETRIC ACCESS State | |
114 | */ | |
115 | buf[off++] |= (atomic_read( | |
116 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); | |
117 | /* | |
118 | * Set supported ASYMMETRIC ACCESS State bits | |
119 | */ | |
120 | buf[off] = 0x80; /* T_SUP */ | |
121 | buf[off] |= 0x40; /* O_SUP */ | |
122 | buf[off] |= 0x8; /* U_SUP */ | |
123 | buf[off] |= 0x4; /* S_SUP */ | |
124 | buf[off] |= 0x2; /* AN_SUP */ | |
125 | buf[off++] |= 0x1; /* AO_SUP */ | |
126 | /* | |
127 | * TARGET PORT GROUP | |
128 | */ | |
129 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); | |
130 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); | |
131 | ||
132 | off++; /* Skip over Reserved */ | |
133 | /* | |
134 | * STATUS CODE | |
135 | */ | |
136 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); | |
137 | /* | |
138 | * Vendor Specific field | |
139 | */ | |
140 | buf[off++] = 0x00; | |
141 | /* | |
142 | * TARGET PORT COUNT | |
143 | */ | |
144 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); | |
145 | rd_len += 8; | |
146 | ||
147 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
148 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
149 | tg_pt_gp_mem_list) { | |
150 | port = tg_pt_gp_mem->tg_pt; | |
151 | /* | |
152 | * Start Target Port descriptor format | |
153 | * | |
154 | * See spc4r17 section 6.2.7 Table 247 | |
155 | */ | |
156 | off += 2; /* Skip over Obsolete */ | |
157 | /* | |
158 | * Set RELATIVE TARGET PORT IDENTIFIER | |
159 | */ | |
160 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); | |
161 | buf[off++] = (port->sep_rtpi & 0xff); | |
162 | rd_len += 4; | |
163 | } | |
164 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
165 | } | |
0fd97ccf | 166 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
167 | /* |
168 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload | |
169 | */ | |
5b9a4d72 | 170 | put_unaligned_be32(rd_len, &buf[0]); |
c66ac9db | 171 | |
5b9a4d72 NB |
172 | /* |
173 | * Fill in the Extended header parameter data format if requested | |
174 | */ | |
175 | if (ext_hdr != 0) { | |
176 | buf[4] = 0x10; | |
177 | /* | |
178 | * Set the implict transition time (in seconds) for the application | |
179 | * client to use as a base for it's transition timeout value. | |
180 | * | |
181 | * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN | |
182 | * this CDB was received upon to determine this value individually | |
183 | * for ALUA target port group. | |
184 | */ | |
185 | port = cmd->se_lun->lun_sep; | |
186 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
187 | if (tg_pt_gp_mem) { | |
188 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
189 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
190 | if (tg_pt_gp) | |
191 | buf[5] = tg_pt_gp->tg_pt_gp_implict_trans_secs; | |
192 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
193 | } | |
194 | } | |
4949314c | 195 | transport_kunmap_data_sg(cmd); |
05d1c7c0 | 196 | |
6bb35e00 | 197 | target_complete_cmd(cmd, GOOD); |
c66ac9db NB |
198 | return 0; |
199 | } | |
200 | ||
201 | /* | |
202 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. | |
203 | * | |
204 | * See spc4r17 section 6.35 | |
205 | */ | |
de103c93 CH |
206 | sense_reason_t |
207 | target_emulate_set_target_port_groups(struct se_cmd *cmd) | |
c66ac9db | 208 | { |
5951146d | 209 | struct se_device *dev = cmd->se_dev; |
e3d6f909 AG |
210 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; |
211 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
212 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
213 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
05d1c7c0 AG |
214 | unsigned char *buf; |
215 | unsigned char *ptr; | |
a0d50f62 | 216 | sense_reason_t rc = TCM_NO_SENSE; |
c66ac9db | 217 | u32 len = 4; /* Skip over RESERVED area in header */ |
de103c93 | 218 | int alua_access_state, primary = 0; |
c66ac9db NB |
219 | u16 tg_pt_id, rtpi; |
220 | ||
de103c93 CH |
221 | if (!l_port) |
222 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
223 | ||
0d7f1299 PB |
224 | if (cmd->data_length < 4) { |
225 | pr_warn("SET TARGET PORT GROUPS parameter list length %u too" | |
226 | " small\n", cmd->data_length); | |
de103c93 | 227 | return TCM_INVALID_PARAMETER_LIST; |
0d7f1299 PB |
228 | } |
229 | ||
4949314c | 230 | buf = transport_kmap_data_sg(cmd); |
de103c93 CH |
231 | if (!buf) |
232 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
05d1c7c0 | 233 | |
c66ac9db NB |
234 | /* |
235 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed | |
236 | * for the local tg_pt_gp. | |
237 | */ | |
238 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
239 | if (!l_tg_pt_gp_mem) { |
240 | pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); | |
de103c93 | 241 | rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
05d1c7c0 | 242 | goto out; |
c66ac9db NB |
243 | } |
244 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
245 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 246 | if (!l_tg_pt_gp) { |
c66ac9db | 247 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 248 | pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); |
de103c93 | 249 | rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
05d1c7c0 | 250 | goto out; |
c66ac9db | 251 | } |
c66ac9db NB |
252 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); |
253 | ||
a2e85d18 | 254 | if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)) { |
6708bb27 | 255 | pr_debug("Unable to process SET_TARGET_PORT_GROUPS" |
c66ac9db | 256 | " while TPGS_EXPLICT_ALUA is disabled\n"); |
de103c93 | 257 | rc = TCM_UNSUPPORTED_SCSI_OPCODE; |
05d1c7c0 | 258 | goto out; |
c66ac9db NB |
259 | } |
260 | ||
05d1c7c0 AG |
261 | ptr = &buf[4]; /* Skip over RESERVED area in header */ |
262 | ||
c66ac9db | 263 | while (len < cmd->data_length) { |
de103c93 | 264 | bool found = false; |
c66ac9db NB |
265 | alua_access_state = (ptr[0] & 0x0f); |
266 | /* | |
267 | * Check the received ALUA access state, and determine if | |
268 | * the state is a primary or secondary target port asymmetric | |
269 | * access state. | |
270 | */ | |
271 | rc = core_alua_check_transition(alua_access_state, &primary); | |
de103c93 | 272 | if (rc) { |
c66ac9db NB |
273 | /* |
274 | * If the SET TARGET PORT GROUPS attempts to establish | |
275 | * an invalid combination of target port asymmetric | |
276 | * access states or attempts to establish an | |
277 | * unsupported target port asymmetric access state, | |
278 | * then the command shall be terminated with CHECK | |
279 | * CONDITION status, with the sense key set to ILLEGAL | |
280 | * REQUEST, and the additional sense code set to INVALID | |
281 | * FIELD IN PARAMETER LIST. | |
282 | */ | |
05d1c7c0 | 283 | goto out; |
c66ac9db | 284 | } |
de103c93 | 285 | |
c66ac9db NB |
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(); | |
de103c93 | 317 | |
0fd97ccf | 318 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 319 | |
de103c93 | 320 | if (!core_alua_do_port_transition(tg_pt_gp, |
c66ac9db | 321 | dev, l_port, nacl, |
de103c93 CH |
322 | alua_access_state, 1)) |
323 | found = true; | |
c66ac9db | 324 | |
0fd97ccf | 325 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
326 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
327 | smp_mb__after_atomic_dec(); | |
328 | break; | |
329 | } | |
0fd97ccf | 330 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
331 | } else { |
332 | /* | |
333 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
334 | * the Target Port in question for the the incoming | |
335 | * SET_TARGET_PORT_GROUPS op. | |
336 | */ | |
33395fb8 | 337 | rtpi = get_unaligned_be16(ptr + 2); |
c66ac9db | 338 | /* |
35d1efe8 | 339 | * Locate the matching relative target port identifier |
c66ac9db NB |
340 | * for the struct se_device storage object. |
341 | */ | |
342 | spin_lock(&dev->se_port_lock); | |
343 | list_for_each_entry(port, &dev->dev_sep_list, | |
344 | sep_list) { | |
345 | if (port->sep_rtpi != rtpi) | |
346 | continue; | |
347 | ||
348 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
de103c93 | 349 | |
c66ac9db NB |
350 | spin_unlock(&dev->se_port_lock); |
351 | ||
de103c93 CH |
352 | if (!core_alua_set_tg_pt_secondary_state( |
353 | tg_pt_gp_mem, port, 1, 1)) | |
354 | found = true; | |
c66ac9db NB |
355 | |
356 | spin_lock(&dev->se_port_lock); | |
357 | break; | |
358 | } | |
359 | spin_unlock(&dev->se_port_lock); | |
de103c93 CH |
360 | } |
361 | ||
362 | if (!found) { | |
363 | rc = TCM_INVALID_PARAMETER_LIST; | |
364 | goto out; | |
c66ac9db NB |
365 | } |
366 | ||
367 | ptr += 4; | |
368 | len += 4; | |
369 | } | |
370 | ||
05d1c7c0 | 371 | out: |
4949314c | 372 | transport_kunmap_data_sg(cmd); |
59e4f541 RD |
373 | if (!rc) |
374 | target_complete_cmd(cmd, GOOD); | |
375 | return rc; | |
c66ac9db NB |
376 | } |
377 | ||
378 | static inline int core_alua_state_nonoptimized( | |
379 | struct se_cmd *cmd, | |
380 | unsigned char *cdb, | |
381 | int nonop_delay_msecs, | |
382 | u8 *alua_ascq) | |
383 | { | |
384 | /* | |
385 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
386 | * later to determine if processing of this cmd needs to be | |
387 | * temporarily delayed for the Active/NonOptimized primary access state. | |
388 | */ | |
389 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
390 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
391 | return 0; | |
392 | } | |
393 | ||
394 | static inline int core_alua_state_standby( | |
395 | struct se_cmd *cmd, | |
396 | unsigned char *cdb, | |
397 | u8 *alua_ascq) | |
398 | { | |
399 | /* | |
400 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
401 | * spc4r17 section 5.9.2.4.4 | |
402 | */ | |
403 | switch (cdb[0]) { | |
404 | case INQUIRY: | |
405 | case LOG_SELECT: | |
406 | case LOG_SENSE: | |
407 | case MODE_SELECT: | |
408 | case MODE_SENSE: | |
409 | case REPORT_LUNS: | |
410 | case RECEIVE_DIAGNOSTIC: | |
411 | case SEND_DIAGNOSTIC: | |
412 | case MAINTENANCE_IN: | |
ba539743 | 413 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
414 | case MI_REPORT_TARGET_PGS: |
415 | return 0; | |
416 | default: | |
417 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
418 | return 1; | |
419 | } | |
420 | case MAINTENANCE_OUT: | |
421 | switch (cdb[1]) { | |
422 | case MO_SET_TARGET_PGS: | |
423 | return 0; | |
424 | default: | |
425 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
426 | return 1; | |
427 | } | |
428 | case REQUEST_SENSE: | |
429 | case PERSISTENT_RESERVE_IN: | |
430 | case PERSISTENT_RESERVE_OUT: | |
431 | case READ_BUFFER: | |
432 | case WRITE_BUFFER: | |
433 | return 0; | |
434 | default: | |
435 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
436 | return 1; | |
437 | } | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | static inline int core_alua_state_unavailable( | |
443 | struct se_cmd *cmd, | |
444 | unsigned char *cdb, | |
445 | u8 *alua_ascq) | |
446 | { | |
447 | /* | |
448 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
449 | * spc4r17 section 5.9.2.4.5 | |
450 | */ | |
451 | switch (cdb[0]) { | |
452 | case INQUIRY: | |
453 | case REPORT_LUNS: | |
454 | case MAINTENANCE_IN: | |
ba539743 | 455 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
456 | case MI_REPORT_TARGET_PGS: |
457 | return 0; | |
458 | default: | |
459 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
460 | return 1; | |
461 | } | |
462 | case MAINTENANCE_OUT: | |
463 | switch (cdb[1]) { | |
464 | case MO_SET_TARGET_PGS: | |
465 | return 0; | |
466 | default: | |
467 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
468 | return 1; | |
469 | } | |
470 | case REQUEST_SENSE: | |
471 | case READ_BUFFER: | |
472 | case WRITE_BUFFER: | |
473 | return 0; | |
474 | default: | |
475 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
476 | return 1; | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | static inline int core_alua_state_transition( | |
483 | struct se_cmd *cmd, | |
484 | unsigned char *cdb, | |
485 | u8 *alua_ascq) | |
486 | { | |
487 | /* | |
488 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
489 | * spc4r17 section 5.9.2.5 | |
490 | */ | |
491 | switch (cdb[0]) { | |
492 | case INQUIRY: | |
493 | case REPORT_LUNS: | |
494 | case MAINTENANCE_IN: | |
ba539743 | 495 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
496 | case MI_REPORT_TARGET_PGS: |
497 | return 0; | |
498 | default: | |
499 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
500 | return 1; | |
501 | } | |
502 | case REQUEST_SENSE: | |
503 | case READ_BUFFER: | |
504 | case WRITE_BUFFER: | |
505 | return 0; | |
506 | default: | |
507 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
508 | return 1; | |
509 | } | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
514 | /* | |
c66ac9db NB |
515 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
516 | * return 0: Used to signal success | |
517 | * reutrn -1: Used to signal failure, and invalid cdb field | |
518 | */ | |
de103c93 CH |
519 | sense_reason_t |
520 | target_alua_state_check(struct se_cmd *cmd) | |
c66ac9db | 521 | { |
c87fbd56 CH |
522 | struct se_device *dev = cmd->se_dev; |
523 | unsigned char *cdb = cmd->t_task_cdb; | |
e3d6f909 | 524 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
525 | struct se_port *port = lun->lun_sep; |
526 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
527 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
528 | int out_alua_state, nonop_delay_msecs; | |
c87fbd56 CH |
529 | u8 alua_ascq; |
530 | int ret; | |
531 | ||
532 | if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) | |
533 | return 0; | |
534 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) | |
535 | return 0; | |
c66ac9db | 536 | |
6708bb27 | 537 | if (!port) |
c66ac9db NB |
538 | return 0; |
539 | /* | |
540 | * First, check for a struct se_port specific secondary ALUA target port | |
541 | * access state: OFFLINE | |
542 | */ | |
543 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
6708bb27 | 544 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db | 545 | " target port\n"); |
c87fbd56 CH |
546 | alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
547 | ret = 1; | |
548 | goto out; | |
c66ac9db NB |
549 | } |
550 | /* | |
551 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
552 | * ALUA target port group, to obtain current ALUA access state. | |
553 | * Otherwise look for the underlying struct se_device association with | |
554 | * a ALUA logical unit group. | |
555 | */ | |
556 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
557 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
558 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
559 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
560 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
561 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
562 | /* | |
25985edc LDM |
563 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
564 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
565 | * For the Optimized ALUA access state case, we want to process the |
566 | * incoming fabric cmd ASAP.. | |
567 | */ | |
568 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
569 | return 0; | |
570 | ||
571 | switch (out_alua_state) { | |
572 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
c87fbd56 CH |
573 | ret = core_alua_state_nonoptimized(cmd, cdb, |
574 | nonop_delay_msecs, &alua_ascq); | |
575 | break; | |
c66ac9db | 576 | case ALUA_ACCESS_STATE_STANDBY: |
c87fbd56 CH |
577 | ret = core_alua_state_standby(cmd, cdb, &alua_ascq); |
578 | break; | |
c66ac9db | 579 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
c87fbd56 CH |
580 | ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); |
581 | break; | |
c66ac9db | 582 | case ALUA_ACCESS_STATE_TRANSITION: |
c87fbd56 CH |
583 | ret = core_alua_state_transition(cmd, cdb, &alua_ascq); |
584 | break; | |
c66ac9db NB |
585 | /* |
586 | * OFFLINE is a secondary ALUA target port group access state, that is | |
587 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
588 | */ | |
589 | case ALUA_ACCESS_STATE_OFFLINE: | |
590 | default: | |
6708bb27 | 591 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 592 | out_alua_state); |
de103c93 | 593 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
594 | } |
595 | ||
c87fbd56 CH |
596 | out: |
597 | if (ret > 0) { | |
598 | /* | |
599 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; | |
600 | * The ALUA additional sense code qualifier (ASCQ) is determined | |
601 | * by the ALUA primary or secondary access state.. | |
602 | */ | |
603 | pr_debug("[%s]: ALUA TG Port not available, " | |
604 | "SenseKey: NOT_READY, ASC/ASCQ: " | |
605 | "0x04/0x%02x\n", | |
606 | cmd->se_tfo->get_fabric_name(), alua_ascq); | |
607 | ||
608 | cmd->scsi_asc = 0x04; | |
609 | cmd->scsi_ascq = alua_ascq; | |
de103c93 | 610 | return TCM_CHECK_CONDITION_NOT_READY; |
c87fbd56 CH |
611 | } |
612 | ||
de103c93 | 613 | return 0; |
c66ac9db NB |
614 | } |
615 | ||
616 | /* | |
617 | * Check implict and explict ALUA state change request. | |
618 | */ | |
de103c93 CH |
619 | static sense_reason_t |
620 | core_alua_check_transition(int state, int *primary) | |
c66ac9db NB |
621 | { |
622 | switch (state) { | |
623 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
624 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
625 | case ALUA_ACCESS_STATE_STANDBY: | |
626 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
627 | /* | |
628 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
629 | * defined as primary target port asymmetric access states. | |
630 | */ | |
631 | *primary = 1; | |
632 | break; | |
633 | case ALUA_ACCESS_STATE_OFFLINE: | |
634 | /* | |
635 | * OFFLINE state is defined as a secondary target port | |
636 | * asymmetric access state. | |
637 | */ | |
638 | *primary = 0; | |
639 | break; | |
640 | default: | |
6708bb27 | 641 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
de103c93 | 642 | return TCM_INVALID_PARAMETER_LIST; |
c66ac9db NB |
643 | } |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static char *core_alua_dump_state(int state) | |
649 | { | |
650 | switch (state) { | |
651 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
652 | return "Active/Optimized"; | |
653 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
654 | return "Active/NonOptimized"; | |
655 | case ALUA_ACCESS_STATE_STANDBY: | |
656 | return "Standby"; | |
657 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
658 | return "Unavailable"; | |
659 | case ALUA_ACCESS_STATE_OFFLINE: | |
660 | return "Offline"; | |
661 | default: | |
662 | return "Unknown"; | |
663 | } | |
664 | ||
665 | return NULL; | |
666 | } | |
667 | ||
668 | char *core_alua_dump_status(int status) | |
669 | { | |
670 | switch (status) { | |
671 | case ALUA_STATUS_NONE: | |
672 | return "None"; | |
673 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
674 | return "Altered by Explict STPG"; | |
675 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
676 | return "Altered by Implict ALUA"; | |
677 | default: | |
678 | return "Unknown"; | |
679 | } | |
680 | ||
681 | return NULL; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Used by fabric modules to determine when we need to delay processing | |
686 | * for the Active/NonOptimized paths.. | |
687 | */ | |
688 | int core_alua_check_nonop_delay( | |
689 | struct se_cmd *cmd) | |
690 | { | |
691 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
692 | return 0; | |
693 | if (in_interrupt()) | |
694 | return 0; | |
695 | /* | |
696 | * The ALUA Active/NonOptimized access state delay can be disabled | |
697 | * in via configfs with a value of zero | |
698 | */ | |
6708bb27 | 699 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
700 | return 0; |
701 | /* | |
702 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
703 | * defined interval in core_alua_state_nonoptimized() | |
704 | */ | |
705 | msleep_interruptible(cmd->alua_nonop_delay); | |
706 | return 0; | |
707 | } | |
708 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
709 | ||
710 | /* | |
711 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
712 | * | |
713 | */ | |
714 | static int core_alua_write_tpg_metadata( | |
715 | const char *path, | |
716 | unsigned char *md_buf, | |
717 | u32 md_buf_len) | |
718 | { | |
0e9b10a9 AV |
719 | struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); |
720 | int ret; | |
c66ac9db | 721 | |
0e9b10a9 AV |
722 | if (IS_ERR(file)) { |
723 | pr_err("filp_open(%s) for ALUA metadata failed\n", path); | |
c66ac9db NB |
724 | return -ENODEV; |
725 | } | |
0e9b10a9 AV |
726 | ret = kernel_write(file, md_buf, md_buf_len, 0); |
727 | if (ret < 0) | |
6708bb27 | 728 | pr_err("Error writing ALUA metadata file: %s\n", path); |
0e9b10a9 AV |
729 | fput(file); |
730 | return ret ? -EIO : 0; | |
c66ac9db NB |
731 | } |
732 | ||
733 | /* | |
734 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
735 | */ | |
736 | static int core_alua_update_tpg_primary_metadata( | |
737 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
738 | int primary_state, | |
739 | unsigned char *md_buf) | |
740 | { | |
0fd97ccf | 741 | struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; |
c66ac9db NB |
742 | char path[ALUA_METADATA_PATH_LEN]; |
743 | int len; | |
744 | ||
745 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
746 | ||
747 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
748 | "tg_pt_gp_id=%hu\n" | |
749 | "alua_access_state=0x%02x\n" | |
750 | "alua_access_status=0x%02x\n", | |
751 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
752 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
753 | ||
754 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
755 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
756 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
757 | ||
758 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
759 | } | |
760 | ||
761 | static int core_alua_do_transition_tg_pt( | |
762 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
763 | struct se_port *l_port, | |
764 | struct se_node_acl *nacl, | |
765 | unsigned char *md_buf, | |
766 | int new_state, | |
767 | int explict) | |
768 | { | |
769 | struct se_dev_entry *se_deve; | |
770 | struct se_lun_acl *lacl; | |
771 | struct se_port *port; | |
772 | struct t10_alua_tg_pt_gp_member *mem; | |
773 | int old_state = 0; | |
774 | /* | |
775 | * Save the old primary ALUA access state, and set the current state | |
776 | * to ALUA_ACCESS_STATE_TRANSITION. | |
777 | */ | |
778 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
779 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
780 | ALUA_ACCESS_STATE_TRANSITION); | |
781 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
782 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
783 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
784 | /* | |
785 | * Check for the optional ALUA primary state transition delay | |
786 | */ | |
787 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
788 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
789 | ||
790 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
791 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
792 | tg_pt_gp_mem_list) { | |
793 | port = mem->tg_pt; | |
794 | /* | |
795 | * After an implicit target port asymmetric access state | |
796 | * change, a device server shall establish a unit attention | |
797 | * condition for the initiator port associated with every I_T | |
798 | * nexus with the additional sense code set to ASYMMETRIC | |
799 | * ACCESS STATE CHAGED. | |
800 | * | |
801 | * After an explicit target port asymmetric access state | |
802 | * change, a device server shall establish a unit attention | |
803 | * condition with the additional sense code set to ASYMMETRIC | |
804 | * ACCESS STATE CHANGED for the initiator port associated with | |
805 | * every I_T nexus other than the I_T nexus on which the SET | |
806 | * TARGET PORT GROUPS command | |
807 | */ | |
808 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
809 | smp_mb__after_atomic_inc(); | |
810 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
811 | ||
812 | spin_lock_bh(&port->sep_alua_lock); | |
813 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
814 | alua_port_list) { | |
815 | lacl = se_deve->se_lun_acl; | |
816 | /* | |
817 | * se_deve->se_lun_acl pointer may be NULL for a | |
818 | * entry created without explict Node+MappedLUN ACLs | |
819 | */ | |
6708bb27 | 820 | if (!lacl) |
c66ac9db NB |
821 | continue; |
822 | ||
823 | if (explict && | |
824 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
825 | (l_port != NULL) && (l_port == port)) | |
826 | continue; | |
827 | ||
828 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
829 | se_deve->mapped_lun, 0x2A, | |
830 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
831 | } | |
832 | spin_unlock_bh(&port->sep_alua_lock); | |
833 | ||
834 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
835 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
836 | smp_mb__after_atomic_dec(); | |
837 | } | |
838 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
839 | /* | |
840 | * Update the ALUA metadata buf that has been allocated in | |
841 | * core_alua_do_port_transition(), this metadata will be written | |
842 | * to struct file. | |
843 | * | |
844 | * Note that there is the case where we do not want to update the | |
845 | * metadata when the saved metadata is being parsed in userspace | |
846 | * when setting the existing port access state and access status. | |
847 | * | |
848 | * Also note that the failure to write out the ALUA metadata to | |
849 | * struct file does NOT affect the actual ALUA transition. | |
850 | */ | |
851 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
852 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
853 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
854 | new_state, md_buf); | |
855 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
856 | } | |
857 | /* | |
858 | * Set the current primary ALUA access state to the requested new state | |
859 | */ | |
860 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
861 | ||
6708bb27 | 862 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
863 | " from primary access state %s to %s\n", (explict) ? "explict" : |
864 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
865 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
866 | core_alua_dump_state(new_state)); | |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
871 | int core_alua_do_port_transition( | |
872 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
873 | struct se_device *l_dev, | |
874 | struct se_port *l_port, | |
875 | struct se_node_acl *l_nacl, | |
876 | int new_state, | |
877 | int explict) | |
878 | { | |
879 | struct se_device *dev; | |
880 | struct se_port *port; | |
c66ac9db NB |
881 | struct se_node_acl *nacl; |
882 | struct t10_alua_lu_gp *lu_gp; | |
883 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
884 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
885 | unsigned char *md_buf; | |
886 | int primary; | |
887 | ||
888 | if (core_alua_check_transition(new_state, &primary) != 0) | |
889 | return -EINVAL; | |
890 | ||
891 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
892 | if (!md_buf) { |
893 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
894 | return -ENOMEM; |
895 | } | |
896 | ||
897 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
898 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
899 | lu_gp = local_lu_gp_mem->lu_gp; | |
900 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
901 | smp_mb__after_atomic_inc(); | |
902 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
903 | /* | |
904 | * For storage objects that are members of the 'default_lu_gp', | |
905 | * we only do transition on the passed *l_tp_pt_gp, and not | |
906 | * on all of the matching target port groups IDs in default_lu_gp. | |
907 | */ | |
6708bb27 | 908 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
909 | /* |
910 | * core_alua_do_transition_tg_pt() will always return | |
911 | * success. | |
912 | */ | |
913 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
914 | md_buf, new_state, explict); | |
915 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
916 | smp_mb__after_atomic_dec(); | |
917 | kfree(md_buf); | |
918 | return 0; | |
919 | } | |
920 | /* | |
921 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
922 | * the associated storage objects looking for a matching target port | |
923 | * group ID from the local target port group. | |
924 | */ | |
925 | spin_lock(&lu_gp->lu_gp_lock); | |
926 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
927 | lu_gp_mem_list) { | |
928 | ||
929 | dev = lu_gp_mem->lu_gp_mem_dev; | |
c66ac9db NB |
930 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
931 | smp_mb__after_atomic_inc(); | |
932 | spin_unlock(&lu_gp->lu_gp_lock); | |
933 | ||
0fd97ccf | 934 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 935 | list_for_each_entry(tg_pt_gp, |
0fd97ccf | 936 | &dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
937 | tg_pt_gp_list) { |
938 | ||
6708bb27 | 939 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
940 | continue; |
941 | /* | |
942 | * If the target behavior port asymmetric access state | |
943 | * is changed for any target port group accessiable via | |
944 | * a logical unit within a LU group, the target port | |
945 | * behavior group asymmetric access states for the same | |
946 | * target port group accessible via other logical units | |
947 | * in that LU group will also change. | |
948 | */ | |
949 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
950 | continue; | |
951 | ||
952 | if (l_tg_pt_gp == tg_pt_gp) { | |
953 | port = l_port; | |
954 | nacl = l_nacl; | |
955 | } else { | |
956 | port = NULL; | |
957 | nacl = NULL; | |
958 | } | |
959 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
960 | smp_mb__after_atomic_inc(); | |
0fd97ccf | 961 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
962 | /* |
963 | * core_alua_do_transition_tg_pt() will always return | |
964 | * success. | |
965 | */ | |
966 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
967 | nacl, md_buf, new_state, explict); | |
968 | ||
0fd97ccf | 969 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
970 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
971 | smp_mb__after_atomic_dec(); | |
972 | } | |
0fd97ccf | 973 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
974 | |
975 | spin_lock(&lu_gp->lu_gp_lock); | |
976 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
977 | smp_mb__after_atomic_dec(); | |
978 | } | |
979 | spin_unlock(&lu_gp->lu_gp_lock); | |
980 | ||
6708bb27 | 981 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
982 | " Group IDs: %hu %s transition to primary state: %s\n", |
983 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
984 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
985 | core_alua_dump_state(new_state)); | |
986 | ||
987 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
988 | smp_mb__after_atomic_dec(); | |
989 | kfree(md_buf); | |
990 | return 0; | |
991 | } | |
992 | ||
993 | /* | |
994 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
995 | */ | |
996 | static int core_alua_update_tpg_secondary_metadata( | |
997 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
998 | struct se_port *port, | |
999 | unsigned char *md_buf, | |
1000 | u32 md_buf_len) | |
1001 | { | |
1002 | struct se_portal_group *se_tpg = port->sep_tpg; | |
1003 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
1004 | int len; | |
1005 | ||
1006 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
1007 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
1008 | ||
1009 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 1010 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 1011 | |
e3d6f909 | 1012 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 1013 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 1014 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
1015 | |
1016 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
1017 | "alua_tg_pt_status=0x%02x\n", | |
1018 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
1019 | port->sep_tg_pt_secondary_stat); | |
1020 | ||
1021 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 1022 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
1023 | port->sep_lun->unpacked_lun); |
1024 | ||
1025 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
1026 | } | |
1027 | ||
1028 | static int core_alua_set_tg_pt_secondary_state( | |
1029 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1030 | struct se_port *port, | |
1031 | int explict, | |
1032 | int offline) | |
1033 | { | |
1034 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1035 | unsigned char *md_buf; | |
1036 | u32 md_buf_len; | |
1037 | int trans_delay_msecs; | |
1038 | ||
1039 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1040 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1041 | if (!tg_pt_gp) { |
c66ac9db | 1042 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1043 | pr_err("Unable to complete secondary state" |
c66ac9db | 1044 | " transition\n"); |
e3d6f909 | 1045 | return -EINVAL; |
c66ac9db NB |
1046 | } |
1047 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1048 | /* | |
1049 | * Set the secondary ALUA target port access state to OFFLINE | |
1050 | * or release the previously secondary state for struct se_port | |
1051 | */ | |
1052 | if (offline) | |
1053 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1054 | else | |
1055 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1056 | ||
1057 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1058 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1059 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1060 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1061 | ||
6708bb27 | 1062 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1063 | " to secondary access state: %s\n", (explict) ? "explict" : |
1064 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1065 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1066 | ||
1067 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1068 | /* | |
1069 | * Do the optional transition delay after we set the secondary | |
1070 | * ALUA access state. | |
1071 | */ | |
1072 | if (trans_delay_msecs != 0) | |
1073 | msleep_interruptible(trans_delay_msecs); | |
1074 | /* | |
1075 | * See if we need to update the ALUA fabric port metadata for | |
1076 | * secondary state and status | |
1077 | */ | |
1078 | if (port->sep_tg_pt_secondary_write_md) { | |
1079 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1080 | if (!md_buf) { |
1081 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1082 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1083 | return -ENOMEM; |
c66ac9db NB |
1084 | } |
1085 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1086 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1087 | md_buf, md_buf_len); | |
1088 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1089 | ||
1090 | kfree(md_buf); | |
1091 | } | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | struct t10_alua_lu_gp * | |
1097 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1098 | { | |
1099 | struct t10_alua_lu_gp *lu_gp; | |
1100 | ||
1101 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1102 | if (!lu_gp) { |
1103 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1104 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1105 | } |
e3d6f909 | 1106 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1107 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1108 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1109 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1110 | ||
1111 | if (def_group) { | |
e3d6f909 | 1112 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1113 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1114 | alua_lu_gps_count++; |
c66ac9db NB |
1115 | } |
1116 | ||
1117 | return lu_gp; | |
1118 | } | |
1119 | ||
1120 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1121 | { | |
1122 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1123 | u16 lu_gp_id_tmp; | |
1124 | /* | |
1125 | * The lu_gp->lu_gp_id may only be set once.. | |
1126 | */ | |
1127 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1128 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1129 | " ignoring request\n"); |
e3d6f909 | 1130 | return -EINVAL; |
c66ac9db NB |
1131 | } |
1132 | ||
e3d6f909 AG |
1133 | spin_lock(&lu_gps_lock); |
1134 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1135 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1136 | " 0x0000ffff reached\n"); |
e3d6f909 | 1137 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1138 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1139 | return -ENOSPC; |
c66ac9db NB |
1140 | } |
1141 | again: | |
1142 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1143 | alua_lu_gps_counter++; |
c66ac9db | 1144 | |
e3d6f909 | 1145 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1146 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1147 | if (!lu_gp_id) |
c66ac9db NB |
1148 | goto again; |
1149 | ||
6708bb27 | 1150 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1151 | " already exists, ignoring request\n", |
1152 | lu_gp_id); | |
e3d6f909 AG |
1153 | spin_unlock(&lu_gps_lock); |
1154 | return -EINVAL; | |
c66ac9db NB |
1155 | } |
1156 | } | |
1157 | ||
1158 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1159 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1160 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1161 | alua_lu_gps_count++; | |
1162 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1163 | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | static struct t10_alua_lu_gp_member * | |
1168 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1169 | { | |
1170 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1171 | ||
1172 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1173 | if (!lu_gp_mem) { |
1174 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1175 | return ERR_PTR(-ENOMEM); |
1176 | } | |
1177 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1178 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1179 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1180 | ||
1181 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1182 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1183 | ||
1184 | return lu_gp_mem; | |
1185 | } | |
1186 | ||
1187 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1188 | { | |
1189 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1190 | /* | |
1191 | * Once we have reached this point, config_item_put() has | |
1192 | * already been called from target_core_alua_drop_lu_gp(). | |
1193 | * | |
1194 | * Here, we remove the *lu_gp from the global list so that | |
1195 | * no associations can be made while we are releasing | |
1196 | * struct t10_alua_lu_gp. | |
1197 | */ | |
e3d6f909 | 1198 | spin_lock(&lu_gps_lock); |
e3d6f909 AG |
1199 | list_del(&lu_gp->lu_gp_node); |
1200 | alua_lu_gps_count--; | |
1201 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1202 | /* |
1203 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1204 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1205 | * released with core_alua_put_lu_gp_from_name() | |
1206 | */ | |
1207 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1208 | cpu_relax(); | |
1209 | /* | |
1210 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1211 | * struct se_device. | |
1212 | */ | |
1213 | spin_lock(&lu_gp->lu_gp_lock); | |
1214 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1215 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1216 | if (lu_gp_mem->lu_gp_assoc) { | |
1217 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1218 | lu_gp->lu_gp_members--; | |
1219 | lu_gp_mem->lu_gp_assoc = 0; | |
1220 | } | |
1221 | spin_unlock(&lu_gp->lu_gp_lock); | |
1222 | /* | |
1223 | * | |
25985edc | 1224 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1225 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1226 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1227 | * | |
1228 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1229 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1230 | */ | |
1231 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1232 | if (lu_gp != default_lu_gp) |
c66ac9db | 1233 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1234 | default_lu_gp); |
c66ac9db NB |
1235 | else |
1236 | lu_gp_mem->lu_gp = NULL; | |
1237 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1238 | ||
1239 | spin_lock(&lu_gp->lu_gp_lock); | |
1240 | } | |
1241 | spin_unlock(&lu_gp->lu_gp_lock); | |
1242 | ||
1243 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1244 | } | |
1245 | ||
1246 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1247 | { | |
c66ac9db NB |
1248 | struct t10_alua_lu_gp *lu_gp; |
1249 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1250 | ||
c66ac9db | 1251 | lu_gp_mem = dev->dev_alua_lu_gp_mem; |
6708bb27 | 1252 | if (!lu_gp_mem) |
c66ac9db NB |
1253 | return; |
1254 | ||
1255 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1256 | cpu_relax(); | |
1257 | ||
1258 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1259 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1260 | if (lu_gp) { |
c66ac9db NB |
1261 | spin_lock(&lu_gp->lu_gp_lock); |
1262 | if (lu_gp_mem->lu_gp_assoc) { | |
1263 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1264 | lu_gp->lu_gp_members--; | |
1265 | lu_gp_mem->lu_gp_assoc = 0; | |
1266 | } | |
1267 | spin_unlock(&lu_gp->lu_gp_lock); | |
1268 | lu_gp_mem->lu_gp = NULL; | |
1269 | } | |
1270 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1271 | ||
1272 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1273 | } | |
1274 | ||
1275 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1276 | { | |
1277 | struct t10_alua_lu_gp *lu_gp; | |
1278 | struct config_item *ci; | |
1279 | ||
e3d6f909 AG |
1280 | spin_lock(&lu_gps_lock); |
1281 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1282 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1283 | continue; |
1284 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1285 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1286 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1287 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1288 | return lu_gp; |
1289 | } | |
1290 | } | |
e3d6f909 | 1291 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1292 | |
1293 | return NULL; | |
1294 | } | |
1295 | ||
1296 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1297 | { | |
e3d6f909 | 1298 | spin_lock(&lu_gps_lock); |
c66ac9db | 1299 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1300 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1301 | } |
1302 | ||
1303 | /* | |
1304 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1305 | */ | |
1306 | void __core_alua_attach_lu_gp_mem( | |
1307 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1308 | struct t10_alua_lu_gp *lu_gp) | |
1309 | { | |
1310 | spin_lock(&lu_gp->lu_gp_lock); | |
1311 | lu_gp_mem->lu_gp = lu_gp; | |
1312 | lu_gp_mem->lu_gp_assoc = 1; | |
1313 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1314 | lu_gp->lu_gp_members++; | |
1315 | spin_unlock(&lu_gp->lu_gp_lock); | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1320 | */ | |
1321 | void __core_alua_drop_lu_gp_mem( | |
1322 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1323 | struct t10_alua_lu_gp *lu_gp) | |
1324 | { | |
1325 | spin_lock(&lu_gp->lu_gp_lock); | |
1326 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1327 | lu_gp_mem->lu_gp = NULL; | |
1328 | lu_gp_mem->lu_gp_assoc = 0; | |
1329 | lu_gp->lu_gp_members--; | |
1330 | spin_unlock(&lu_gp->lu_gp_lock); | |
1331 | } | |
1332 | ||
0fd97ccf CH |
1333 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, |
1334 | const char *name, int def_group) | |
c66ac9db NB |
1335 | { |
1336 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1337 | ||
1338 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1339 | if (!tg_pt_gp) { |
1340 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1341 | return NULL; |
1342 | } | |
1343 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1344 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1345 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1346 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1347 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
0fd97ccf | 1348 | tg_pt_gp->tg_pt_gp_dev = dev; |
c66ac9db NB |
1349 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
1350 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1351 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1352 | /* | |
1353 | * Enable both explict and implict ALUA support by default | |
1354 | */ | |
1355 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1356 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1357 | /* | |
1358 | * Set the default Active/NonOptimized Delay in milliseconds | |
1359 | */ | |
1360 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1361 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
5b9a4d72 | 1362 | tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; |
c66ac9db NB |
1363 | |
1364 | if (def_group) { | |
0fd97ccf | 1365 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1366 | tg_pt_gp->tg_pt_gp_id = |
0fd97ccf | 1367 | dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1368 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
0fd97ccf | 1369 | dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1370 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
0fd97ccf CH |
1371 | &dev->t10_alua.tg_pt_gps_list); |
1372 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1373 | } |
1374 | ||
1375 | return tg_pt_gp; | |
1376 | } | |
1377 | ||
1378 | int core_alua_set_tg_pt_gp_id( | |
1379 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1380 | u16 tg_pt_gp_id) | |
1381 | { | |
0fd97ccf | 1382 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db NB |
1383 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
1384 | u16 tg_pt_gp_id_tmp; | |
0fd97ccf | 1385 | |
c66ac9db NB |
1386 | /* |
1387 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1388 | */ | |
1389 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1390 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1391 | " ignoring request\n"); |
e3d6f909 | 1392 | return -EINVAL; |
c66ac9db NB |
1393 | } |
1394 | ||
0fd97ccf CH |
1395 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
1396 | if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1397 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1398 | " 0x0000ffff reached\n"); |
0fd97ccf | 1399 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1400 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1401 | return -ENOSPC; |
c66ac9db NB |
1402 | } |
1403 | again: | |
1404 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
0fd97ccf | 1405 | dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1406 | |
0fd97ccf | 1407 | list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1408 | tg_pt_gp_list) { |
1409 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1410 | if (!tg_pt_gp_id) |
c66ac9db NB |
1411 | goto again; |
1412 | ||
6708bb27 | 1413 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1414 | " exists, ignoring request\n", tg_pt_gp_id); |
0fd97ccf | 1415 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
e3d6f909 | 1416 | return -EINVAL; |
c66ac9db NB |
1417 | } |
1418 | } | |
1419 | ||
1420 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1421 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1422 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
0fd97ccf CH |
1423 | &dev->t10_alua.tg_pt_gps_list); |
1424 | dev->t10_alua.alua_tg_pt_gps_count++; | |
1425 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1426 | |
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1431 | struct se_port *port) | |
1432 | { | |
1433 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1434 | ||
1435 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1436 | GFP_KERNEL); | |
6708bb27 AG |
1437 | if (!tg_pt_gp_mem) { |
1438 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1439 | return ERR_PTR(-ENOMEM); |
1440 | } | |
1441 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1442 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1443 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1444 | ||
1445 | tg_pt_gp_mem->tg_pt = port; | |
1446 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
c66ac9db NB |
1447 | |
1448 | return tg_pt_gp_mem; | |
1449 | } | |
1450 | ||
1451 | void core_alua_free_tg_pt_gp( | |
1452 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1453 | { | |
0fd97ccf | 1454 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db | 1455 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
0fd97ccf | 1456 | |
c66ac9db NB |
1457 | /* |
1458 | * Once we have reached this point, config_item_put() has already | |
1459 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1460 | * | |
1461 | * Here we remove *tg_pt_gp from the global list so that | |
1462 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1463 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1464 | */ | |
0fd97ccf | 1465 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1466 | list_del(&tg_pt_gp->tg_pt_gp_list); |
0fd97ccf CH |
1467 | dev->t10_alua.alua_tg_pt_gps_counter--; |
1468 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
1469 | ||
c66ac9db NB |
1470 | /* |
1471 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1472 | * core_alua_get_tg_pt_gp_by_name() in | |
1473 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1474 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1475 | */ | |
1476 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1477 | cpu_relax(); | |
0fd97ccf | 1478 | |
c66ac9db NB |
1479 | /* |
1480 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1481 | * struct se_port. | |
1482 | */ | |
1483 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1484 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1485 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1486 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1487 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1488 | tg_pt_gp->tg_pt_gp_members--; | |
1489 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1490 | } | |
1491 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1492 | /* | |
25985edc | 1493 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1494 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1495 | * core_alua_free_tg_pt_gp_mem(). | |
1496 | * | |
1497 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1498 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1499 | * default_tg_pt_gp. | |
1500 | */ | |
1501 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
0fd97ccf | 1502 | if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1503 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
0fd97ccf | 1504 | dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1505 | } else |
1506 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1507 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1508 | ||
1509 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1510 | } | |
1511 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1512 | ||
1513 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1514 | } | |
1515 | ||
1516 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1517 | { | |
c66ac9db NB |
1518 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1519 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1520 | ||
c66ac9db | 1521 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
6708bb27 | 1522 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1523 | return; |
1524 | ||
1525 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1526 | cpu_relax(); | |
1527 | ||
1528 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1529 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1530 | if (tg_pt_gp) { |
c66ac9db NB |
1531 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1532 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1533 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1534 | tg_pt_gp->tg_pt_gp_members--; | |
1535 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1536 | } | |
1537 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1538 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1539 | } | |
1540 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1541 | ||
1542 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1543 | } | |
1544 | ||
1545 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
0fd97ccf | 1546 | struct se_device *dev, const char *name) |
c66ac9db NB |
1547 | { |
1548 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1549 | struct config_item *ci; | |
1550 | ||
0fd97ccf CH |
1551 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
1552 | list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1553 | tg_pt_gp_list) { |
6708bb27 | 1554 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1555 | continue; |
1556 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1557 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1558 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
0fd97ccf | 1559 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1560 | return tg_pt_gp; |
1561 | } | |
1562 | } | |
0fd97ccf | 1563 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1564 | |
1565 | return NULL; | |
1566 | } | |
1567 | ||
1568 | static void core_alua_put_tg_pt_gp_from_name( | |
1569 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1570 | { | |
0fd97ccf | 1571 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db | 1572 | |
0fd97ccf | 1573 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1574 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
0fd97ccf | 1575 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1576 | } |
1577 | ||
1578 | /* | |
1579 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1580 | */ | |
1581 | void __core_alua_attach_tg_pt_gp_mem( | |
1582 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1583 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1584 | { | |
1585 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1586 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1587 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1588 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1589 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1590 | tg_pt_gp->tg_pt_gp_members++; | |
1591 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1596 | */ | |
1597 | static void __core_alua_drop_tg_pt_gp_mem( | |
1598 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1599 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1600 | { | |
1601 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1602 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1603 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1604 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1605 | tg_pt_gp->tg_pt_gp_members--; | |
1606 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1607 | } | |
1608 | ||
1609 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1610 | { | |
c66ac9db | 1611 | struct config_item *tg_pt_ci; |
c66ac9db NB |
1612 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1613 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1614 | ssize_t len = 0; | |
1615 | ||
c66ac9db | 1616 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
6708bb27 | 1617 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1618 | return len; |
1619 | ||
1620 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1621 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1622 | if (tg_pt_gp) { |
c66ac9db NB |
1623 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1624 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1625 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1626 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1627 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1628 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1629 | core_alua_dump_state(atomic_read( | |
1630 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1631 | core_alua_dump_status( | |
1632 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1633 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1634 | "Offline" : "None", | |
1635 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1636 | } | |
1637 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1638 | ||
1639 | return len; | |
1640 | } | |
1641 | ||
1642 | ssize_t core_alua_store_tg_pt_gp_info( | |
1643 | struct se_port *port, | |
1644 | const char *page, | |
1645 | size_t count) | |
1646 | { | |
1647 | struct se_portal_group *tpg; | |
1648 | struct se_lun *lun; | |
0fd97ccf | 1649 | struct se_device *dev = port->sep_lun->lun_se_dev; |
c66ac9db NB |
1650 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
1651 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1652 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1653 | int move = 0; | |
1654 | ||
1655 | tpg = port->sep_tpg; | |
1656 | lun = port->sep_lun; | |
1657 | ||
c87fbd56 CH |
1658 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
1659 | if (!tg_pt_gp_mem) | |
1660 | return 0; | |
c66ac9db NB |
1661 | |
1662 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1663 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1664 | return -EINVAL; |
1665 | } | |
1666 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1667 | memcpy(buf, page, count); | |
1668 | /* | |
1669 | * Any ALUA target port group alias besides "NULL" means we will be | |
1670 | * making a new group association. | |
1671 | */ | |
1672 | if (strcmp(strstrip(buf), "NULL")) { | |
1673 | /* | |
1674 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1675 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1676 | * core_alua_put_tg_pt_gp_from_name() below. | |
1677 | */ | |
0fd97ccf | 1678 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, |
c66ac9db | 1679 | strstrip(buf)); |
6708bb27 | 1680 | if (!tg_pt_gp_new) |
c66ac9db NB |
1681 | return -ENODEV; |
1682 | } | |
c66ac9db NB |
1683 | |
1684 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1685 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1686 | if (tg_pt_gp) { |
c66ac9db NB |
1687 | /* |
1688 | * Clearing an existing tg_pt_gp association, and replacing | |
1689 | * with the default_tg_pt_gp. | |
1690 | */ | |
6708bb27 AG |
1691 | if (!tg_pt_gp_new) { |
1692 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1693 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1694 | " alua/%s, ID: %hu back to" | |
1695 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1696 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1697 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1698 | config_item_name(&lun->lun_group.cg_item), |
1699 | config_item_name( | |
1700 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1701 | tg_pt_gp->tg_pt_gp_id); | |
1702 | ||
1703 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1704 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
0fd97ccf | 1705 | dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1706 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1707 | ||
1708 | return count; | |
1709 | } | |
1710 | /* | |
1711 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1712 | */ | |
1713 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1714 | move = 1; | |
1715 | } | |
1716 | /* | |
1717 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1718 | */ | |
1719 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1720 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1721 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1722 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1723 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1724 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1725 | config_item_name(&lun->lun_group.cg_item), |
1726 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1727 | tg_pt_gp_new->tg_pt_gp_id); | |
1728 | ||
1729 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1730 | return count; | |
1731 | } | |
1732 | ||
1733 | ssize_t core_alua_show_access_type( | |
1734 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1735 | char *page) | |
1736 | { | |
1737 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1738 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1739 | return sprintf(page, "Implict and Explict\n"); | |
1740 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1741 | return sprintf(page, "Implict\n"); | |
1742 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1743 | return sprintf(page, "Explict\n"); | |
1744 | else | |
1745 | return sprintf(page, "None\n"); | |
1746 | } | |
1747 | ||
1748 | ssize_t core_alua_store_access_type( | |
1749 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1750 | const char *page, | |
1751 | size_t count) | |
1752 | { | |
1753 | unsigned long tmp; | |
1754 | int ret; | |
1755 | ||
1756 | ret = strict_strtoul(page, 0, &tmp); | |
1757 | if (ret < 0) { | |
6708bb27 | 1758 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1759 | return -EINVAL; |
1760 | } | |
1761 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1762 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1763 | " %lu\n", tmp); |
1764 | return -EINVAL; | |
1765 | } | |
1766 | if (tmp == 3) | |
1767 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1768 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1769 | else if (tmp == 2) | |
1770 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1771 | else if (tmp == 1) | |
1772 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1773 | else | |
1774 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1775 | ||
1776 | return count; | |
1777 | } | |
1778 | ||
1779 | ssize_t core_alua_show_nonop_delay_msecs( | |
1780 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1781 | char *page) | |
1782 | { | |
1783 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1784 | } | |
1785 | ||
1786 | ssize_t core_alua_store_nonop_delay_msecs( | |
1787 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1788 | const char *page, | |
1789 | size_t count) | |
1790 | { | |
1791 | unsigned long tmp; | |
1792 | int ret; | |
1793 | ||
1794 | ret = strict_strtoul(page, 0, &tmp); | |
1795 | if (ret < 0) { | |
6708bb27 | 1796 | pr_err("Unable to extract nonop_delay_msecs\n"); |
c66ac9db NB |
1797 | return -EINVAL; |
1798 | } | |
1799 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1800 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1801 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1802 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1803 | return -EINVAL; | |
1804 | } | |
1805 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1806 | ||
1807 | return count; | |
1808 | } | |
1809 | ||
1810 | ssize_t core_alua_show_trans_delay_msecs( | |
1811 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1812 | char *page) | |
1813 | { | |
1814 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
1815 | } | |
1816 | ||
1817 | ssize_t core_alua_store_trans_delay_msecs( | |
1818 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1819 | const char *page, | |
1820 | size_t count) | |
1821 | { | |
1822 | unsigned long tmp; | |
1823 | int ret; | |
1824 | ||
1825 | ret = strict_strtoul(page, 0, &tmp); | |
1826 | if (ret < 0) { | |
6708bb27 | 1827 | pr_err("Unable to extract trans_delay_msecs\n"); |
c66ac9db NB |
1828 | return -EINVAL; |
1829 | } | |
1830 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1831 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1832 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1833 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1834 | return -EINVAL; | |
1835 | } | |
1836 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1837 | ||
1838 | return count; | |
1839 | } | |
1840 | ||
5b9a4d72 NB |
1841 | ssize_t core_alua_show_implict_trans_secs( |
1842 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1843 | char *page) | |
1844 | { | |
1845 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); | |
1846 | } | |
1847 | ||
1848 | ssize_t core_alua_store_implict_trans_secs( | |
1849 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1850 | const char *page, | |
1851 | size_t count) | |
1852 | { | |
1853 | unsigned long tmp; | |
1854 | int ret; | |
1855 | ||
1856 | ret = strict_strtoul(page, 0, &tmp); | |
1857 | if (ret < 0) { | |
1858 | pr_err("Unable to extract implict_trans_secs\n"); | |
1859 | return -EINVAL; | |
1860 | } | |
1861 | if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { | |
1862 | pr_err("Passed implict_trans_secs: %lu, exceeds" | |
1863 | " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, | |
1864 | ALUA_MAX_IMPLICT_TRANS_SECS); | |
1865 | return -EINVAL; | |
1866 | } | |
1867 | tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; | |
1868 | ||
1869 | return count; | |
1870 | } | |
1871 | ||
c66ac9db NB |
1872 | ssize_t core_alua_show_preferred_bit( |
1873 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1874 | char *page) | |
1875 | { | |
1876 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1877 | } | |
1878 | ||
1879 | ssize_t core_alua_store_preferred_bit( | |
1880 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1881 | const char *page, | |
1882 | size_t count) | |
1883 | { | |
1884 | unsigned long tmp; | |
1885 | int ret; | |
1886 | ||
1887 | ret = strict_strtoul(page, 0, &tmp); | |
1888 | if (ret < 0) { | |
6708bb27 | 1889 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1890 | return -EINVAL; |
1891 | } | |
1892 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1893 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1894 | return -EINVAL; |
1895 | } | |
1896 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1897 | ||
1898 | return count; | |
1899 | } | |
1900 | ||
1901 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1902 | { | |
6708bb27 | 1903 | if (!lun->lun_sep) |
c66ac9db NB |
1904 | return -ENODEV; |
1905 | ||
1906 | return sprintf(page, "%d\n", | |
1907 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1908 | } | |
1909 | ||
1910 | ssize_t core_alua_store_offline_bit( | |
1911 | struct se_lun *lun, | |
1912 | const char *page, | |
1913 | size_t count) | |
1914 | { | |
1915 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1916 | unsigned long tmp; | |
1917 | int ret; | |
1918 | ||
6708bb27 | 1919 | if (!lun->lun_sep) |
c66ac9db NB |
1920 | return -ENODEV; |
1921 | ||
1922 | ret = strict_strtoul(page, 0, &tmp); | |
1923 | if (ret < 0) { | |
6708bb27 | 1924 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1925 | return -EINVAL; |
1926 | } | |
1927 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1928 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1929 | tmp); |
1930 | return -EINVAL; | |
1931 | } | |
1932 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1933 | if (!tg_pt_gp_mem) { |
1934 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1935 | return -EINVAL; |
1936 | } | |
1937 | ||
1938 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1939 | lun->lun_sep, 0, (int)tmp); | |
1940 | if (ret < 0) | |
1941 | return -EINVAL; | |
1942 | ||
1943 | return count; | |
1944 | } | |
1945 | ||
1946 | ssize_t core_alua_show_secondary_status( | |
1947 | struct se_lun *lun, | |
1948 | char *page) | |
1949 | { | |
1950 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1951 | } | |
1952 | ||
1953 | ssize_t core_alua_store_secondary_status( | |
1954 | struct se_lun *lun, | |
1955 | const char *page, | |
1956 | size_t count) | |
1957 | { | |
1958 | unsigned long tmp; | |
1959 | int ret; | |
1960 | ||
1961 | ret = strict_strtoul(page, 0, &tmp); | |
1962 | if (ret < 0) { | |
6708bb27 | 1963 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
1964 | return -EINVAL; |
1965 | } | |
1966 | if ((tmp != ALUA_STATUS_NONE) && | |
1967 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1968 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 1969 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
1970 | tmp); |
1971 | return -EINVAL; | |
1972 | } | |
1973 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
1974 | ||
1975 | return count; | |
1976 | } | |
1977 | ||
1978 | ssize_t core_alua_show_secondary_write_metadata( | |
1979 | struct se_lun *lun, | |
1980 | char *page) | |
1981 | { | |
1982 | return sprintf(page, "%d\n", | |
1983 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
1984 | } | |
1985 | ||
1986 | ssize_t core_alua_store_secondary_write_metadata( | |
1987 | struct se_lun *lun, | |
1988 | const char *page, | |
1989 | size_t count) | |
1990 | { | |
1991 | unsigned long tmp; | |
1992 | int ret; | |
1993 | ||
1994 | ret = strict_strtoul(page, 0, &tmp); | |
1995 | if (ret < 0) { | |
6708bb27 | 1996 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
1997 | return -EINVAL; |
1998 | } | |
1999 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 2000 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
2001 | " %lu\n", tmp); |
2002 | return -EINVAL; | |
2003 | } | |
2004 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
2005 | ||
2006 | return count; | |
2007 | } | |
2008 | ||
0fd97ccf | 2009 | int core_setup_alua(struct se_device *dev) |
c66ac9db | 2010 | { |
c87fbd56 CH |
2011 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && |
2012 | !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { | |
2013 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
0fd97ccf | 2014 | |
c66ac9db | 2015 | /* |
25985edc | 2016 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
2017 | * LUN Group. |
2018 | */ | |
2019 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
2020 | if (IS_ERR(lu_gp_mem)) |
2021 | return PTR_ERR(lu_gp_mem); | |
c66ac9db | 2022 | |
c66ac9db NB |
2023 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
2024 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2025 | default_lu_gp); |
c66ac9db NB |
2026 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2027 | ||
6708bb27 | 2028 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2029 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2030 | dev->transport->name); |
c66ac9db NB |
2031 | } |
2032 | ||
2033 | return 0; | |
2034 | } |