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: | |
30f359a6 | 412 | return 0; |
c66ac9db | 413 | case MAINTENANCE_IN: |
ba539743 | 414 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
415 | case MI_REPORT_TARGET_PGS: |
416 | return 0; | |
417 | default: | |
418 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
419 | return 1; | |
420 | } | |
421 | case MAINTENANCE_OUT: | |
422 | switch (cdb[1]) { | |
423 | case MO_SET_TARGET_PGS: | |
424 | return 0; | |
425 | default: | |
426 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
427 | return 1; | |
428 | } | |
429 | case REQUEST_SENSE: | |
430 | case PERSISTENT_RESERVE_IN: | |
431 | case PERSISTENT_RESERVE_OUT: | |
432 | case READ_BUFFER: | |
433 | case WRITE_BUFFER: | |
434 | return 0; | |
435 | default: | |
436 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
437 | return 1; | |
438 | } | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | static inline int core_alua_state_unavailable( | |
444 | struct se_cmd *cmd, | |
445 | unsigned char *cdb, | |
446 | u8 *alua_ascq) | |
447 | { | |
448 | /* | |
449 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
450 | * spc4r17 section 5.9.2.4.5 | |
451 | */ | |
452 | switch (cdb[0]) { | |
453 | case INQUIRY: | |
454 | case REPORT_LUNS: | |
30f359a6 | 455 | return 0; |
c66ac9db | 456 | case MAINTENANCE_IN: |
ba539743 | 457 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
458 | case MI_REPORT_TARGET_PGS: |
459 | return 0; | |
460 | default: | |
461 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
462 | return 1; | |
463 | } | |
464 | case MAINTENANCE_OUT: | |
465 | switch (cdb[1]) { | |
466 | case MO_SET_TARGET_PGS: | |
467 | return 0; | |
468 | default: | |
469 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
470 | return 1; | |
471 | } | |
472 | case REQUEST_SENSE: | |
473 | case READ_BUFFER: | |
474 | case WRITE_BUFFER: | |
475 | return 0; | |
476 | default: | |
477 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
478 | return 1; | |
479 | } | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static inline int core_alua_state_transition( | |
485 | struct se_cmd *cmd, | |
486 | unsigned char *cdb, | |
487 | u8 *alua_ascq) | |
488 | { | |
489 | /* | |
490 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
491 | * spc4r17 section 5.9.2.5 | |
492 | */ | |
493 | switch (cdb[0]) { | |
494 | case INQUIRY: | |
495 | case REPORT_LUNS: | |
30f359a6 | 496 | return 0; |
c66ac9db | 497 | case MAINTENANCE_IN: |
ba539743 | 498 | switch (cdb[1] & 0x1f) { |
c66ac9db NB |
499 | case MI_REPORT_TARGET_PGS: |
500 | return 0; | |
501 | default: | |
502 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
503 | return 1; | |
504 | } | |
505 | case REQUEST_SENSE: | |
506 | case READ_BUFFER: | |
507 | case WRITE_BUFFER: | |
508 | return 0; | |
509 | default: | |
510 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
511 | return 1; | |
512 | } | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | /* | |
c66ac9db NB |
518 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready |
519 | * return 0: Used to signal success | |
520 | * reutrn -1: Used to signal failure, and invalid cdb field | |
521 | */ | |
de103c93 CH |
522 | sense_reason_t |
523 | target_alua_state_check(struct se_cmd *cmd) | |
c66ac9db | 524 | { |
c87fbd56 CH |
525 | struct se_device *dev = cmd->se_dev; |
526 | unsigned char *cdb = cmd->t_task_cdb; | |
e3d6f909 | 527 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
528 | struct se_port *port = lun->lun_sep; |
529 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
530 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
531 | int out_alua_state, nonop_delay_msecs; | |
c87fbd56 CH |
532 | u8 alua_ascq; |
533 | int ret; | |
534 | ||
535 | if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) | |
536 | return 0; | |
537 | if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) | |
538 | return 0; | |
c66ac9db | 539 | |
6708bb27 | 540 | if (!port) |
c66ac9db NB |
541 | return 0; |
542 | /* | |
543 | * First, check for a struct se_port specific secondary ALUA target port | |
544 | * access state: OFFLINE | |
545 | */ | |
546 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
6708bb27 | 547 | pr_debug("ALUA: Got secondary offline status for local" |
c66ac9db | 548 | " target port\n"); |
c87fbd56 CH |
549 | alua_ascq = ASCQ_04H_ALUA_OFFLINE; |
550 | ret = 1; | |
551 | goto out; | |
c66ac9db NB |
552 | } |
553 | /* | |
554 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
555 | * ALUA target port group, to obtain current ALUA access state. | |
556 | * Otherwise look for the underlying struct se_device association with | |
557 | * a ALUA logical unit group. | |
558 | */ | |
559 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
560 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
561 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
562 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
563 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
564 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
565 | /* | |
25985edc LDM |
566 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
567 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
568 | * For the Optimized ALUA access state case, we want to process the |
569 | * incoming fabric cmd ASAP.. | |
570 | */ | |
571 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
572 | return 0; | |
573 | ||
574 | switch (out_alua_state) { | |
575 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
c87fbd56 CH |
576 | ret = core_alua_state_nonoptimized(cmd, cdb, |
577 | nonop_delay_msecs, &alua_ascq); | |
578 | break; | |
c66ac9db | 579 | case ALUA_ACCESS_STATE_STANDBY: |
c87fbd56 CH |
580 | ret = core_alua_state_standby(cmd, cdb, &alua_ascq); |
581 | break; | |
c66ac9db | 582 | case ALUA_ACCESS_STATE_UNAVAILABLE: |
c87fbd56 CH |
583 | ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq); |
584 | break; | |
c66ac9db | 585 | case ALUA_ACCESS_STATE_TRANSITION: |
c87fbd56 CH |
586 | ret = core_alua_state_transition(cmd, cdb, &alua_ascq); |
587 | break; | |
c66ac9db NB |
588 | /* |
589 | * OFFLINE is a secondary ALUA target port group access state, that is | |
590 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
591 | */ | |
592 | case ALUA_ACCESS_STATE_OFFLINE: | |
593 | default: | |
6708bb27 | 594 | pr_err("Unknown ALUA access state: 0x%02x\n", |
c66ac9db | 595 | out_alua_state); |
de103c93 | 596 | return TCM_INVALID_CDB_FIELD; |
c66ac9db NB |
597 | } |
598 | ||
c87fbd56 CH |
599 | out: |
600 | if (ret > 0) { | |
601 | /* | |
602 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; | |
603 | * The ALUA additional sense code qualifier (ASCQ) is determined | |
604 | * by the ALUA primary or secondary access state.. | |
605 | */ | |
606 | pr_debug("[%s]: ALUA TG Port not available, " | |
607 | "SenseKey: NOT_READY, ASC/ASCQ: " | |
608 | "0x04/0x%02x\n", | |
609 | cmd->se_tfo->get_fabric_name(), alua_ascq); | |
610 | ||
611 | cmd->scsi_asc = 0x04; | |
612 | cmd->scsi_ascq = alua_ascq; | |
de103c93 | 613 | return TCM_CHECK_CONDITION_NOT_READY; |
c87fbd56 CH |
614 | } |
615 | ||
de103c93 | 616 | return 0; |
c66ac9db NB |
617 | } |
618 | ||
619 | /* | |
620 | * Check implict and explict ALUA state change request. | |
621 | */ | |
de103c93 CH |
622 | static sense_reason_t |
623 | core_alua_check_transition(int state, int *primary) | |
c66ac9db NB |
624 | { |
625 | switch (state) { | |
626 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
627 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
628 | case ALUA_ACCESS_STATE_STANDBY: | |
629 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
630 | /* | |
631 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
632 | * defined as primary target port asymmetric access states. | |
633 | */ | |
634 | *primary = 1; | |
635 | break; | |
636 | case ALUA_ACCESS_STATE_OFFLINE: | |
637 | /* | |
638 | * OFFLINE state is defined as a secondary target port | |
639 | * asymmetric access state. | |
640 | */ | |
641 | *primary = 0; | |
642 | break; | |
643 | default: | |
6708bb27 | 644 | pr_err("Unknown ALUA access state: 0x%02x\n", state); |
de103c93 | 645 | return TCM_INVALID_PARAMETER_LIST; |
c66ac9db NB |
646 | } |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static char *core_alua_dump_state(int state) | |
652 | { | |
653 | switch (state) { | |
654 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
655 | return "Active/Optimized"; | |
656 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
657 | return "Active/NonOptimized"; | |
658 | case ALUA_ACCESS_STATE_STANDBY: | |
659 | return "Standby"; | |
660 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
661 | return "Unavailable"; | |
662 | case ALUA_ACCESS_STATE_OFFLINE: | |
663 | return "Offline"; | |
664 | default: | |
665 | return "Unknown"; | |
666 | } | |
667 | ||
668 | return NULL; | |
669 | } | |
670 | ||
671 | char *core_alua_dump_status(int status) | |
672 | { | |
673 | switch (status) { | |
674 | case ALUA_STATUS_NONE: | |
675 | return "None"; | |
676 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
677 | return "Altered by Explict STPG"; | |
678 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
679 | return "Altered by Implict ALUA"; | |
680 | default: | |
681 | return "Unknown"; | |
682 | } | |
683 | ||
684 | return NULL; | |
685 | } | |
686 | ||
687 | /* | |
688 | * Used by fabric modules to determine when we need to delay processing | |
689 | * for the Active/NonOptimized paths.. | |
690 | */ | |
691 | int core_alua_check_nonop_delay( | |
692 | struct se_cmd *cmd) | |
693 | { | |
694 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
695 | return 0; | |
696 | if (in_interrupt()) | |
697 | return 0; | |
698 | /* | |
699 | * The ALUA Active/NonOptimized access state delay can be disabled | |
700 | * in via configfs with a value of zero | |
701 | */ | |
6708bb27 | 702 | if (!cmd->alua_nonop_delay) |
c66ac9db NB |
703 | return 0; |
704 | /* | |
705 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
706 | * defined interval in core_alua_state_nonoptimized() | |
707 | */ | |
708 | msleep_interruptible(cmd->alua_nonop_delay); | |
709 | return 0; | |
710 | } | |
711 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
712 | ||
713 | /* | |
714 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
715 | * | |
716 | */ | |
717 | static int core_alua_write_tpg_metadata( | |
718 | const char *path, | |
719 | unsigned char *md_buf, | |
720 | u32 md_buf_len) | |
721 | { | |
0e9b10a9 AV |
722 | struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600); |
723 | int ret; | |
c66ac9db | 724 | |
0e9b10a9 AV |
725 | if (IS_ERR(file)) { |
726 | pr_err("filp_open(%s) for ALUA metadata failed\n", path); | |
c66ac9db NB |
727 | return -ENODEV; |
728 | } | |
0e9b10a9 AV |
729 | ret = kernel_write(file, md_buf, md_buf_len, 0); |
730 | if (ret < 0) | |
6708bb27 | 731 | pr_err("Error writing ALUA metadata file: %s\n", path); |
0e9b10a9 AV |
732 | fput(file); |
733 | return ret ? -EIO : 0; | |
c66ac9db NB |
734 | } |
735 | ||
736 | /* | |
737 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
738 | */ | |
739 | static int core_alua_update_tpg_primary_metadata( | |
740 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
741 | int primary_state, | |
742 | unsigned char *md_buf) | |
743 | { | |
0fd97ccf | 744 | struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn; |
c66ac9db NB |
745 | char path[ALUA_METADATA_PATH_LEN]; |
746 | int len; | |
747 | ||
748 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
749 | ||
750 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
751 | "tg_pt_gp_id=%hu\n" | |
752 | "alua_access_state=0x%02x\n" | |
753 | "alua_access_status=0x%02x\n", | |
754 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
755 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
756 | ||
757 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
758 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
759 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
760 | ||
761 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
762 | } | |
763 | ||
764 | static int core_alua_do_transition_tg_pt( | |
765 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
766 | struct se_port *l_port, | |
767 | struct se_node_acl *nacl, | |
768 | unsigned char *md_buf, | |
769 | int new_state, | |
770 | int explict) | |
771 | { | |
772 | struct se_dev_entry *se_deve; | |
773 | struct se_lun_acl *lacl; | |
774 | struct se_port *port; | |
775 | struct t10_alua_tg_pt_gp_member *mem; | |
776 | int old_state = 0; | |
777 | /* | |
778 | * Save the old primary ALUA access state, and set the current state | |
779 | * to ALUA_ACCESS_STATE_TRANSITION. | |
780 | */ | |
781 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
782 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
783 | ALUA_ACCESS_STATE_TRANSITION); | |
784 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
785 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
786 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
787 | /* | |
788 | * Check for the optional ALUA primary state transition delay | |
789 | */ | |
790 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
791 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
792 | ||
793 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
794 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
795 | tg_pt_gp_mem_list) { | |
796 | port = mem->tg_pt; | |
797 | /* | |
798 | * After an implicit target port asymmetric access state | |
799 | * change, a device server shall establish a unit attention | |
800 | * condition for the initiator port associated with every I_T | |
801 | * nexus with the additional sense code set to ASYMMETRIC | |
802 | * ACCESS STATE CHAGED. | |
803 | * | |
804 | * After an explicit target port asymmetric access state | |
805 | * change, a device server shall establish a unit attention | |
806 | * condition with the additional sense code set to ASYMMETRIC | |
807 | * ACCESS STATE CHANGED for the initiator port associated with | |
808 | * every I_T nexus other than the I_T nexus on which the SET | |
809 | * TARGET PORT GROUPS command | |
810 | */ | |
811 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
812 | smp_mb__after_atomic_inc(); | |
813 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
814 | ||
815 | spin_lock_bh(&port->sep_alua_lock); | |
816 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
817 | alua_port_list) { | |
818 | lacl = se_deve->se_lun_acl; | |
819 | /* | |
820 | * se_deve->se_lun_acl pointer may be NULL for a | |
821 | * entry created without explict Node+MappedLUN ACLs | |
822 | */ | |
6708bb27 | 823 | if (!lacl) |
c66ac9db NB |
824 | continue; |
825 | ||
826 | if (explict && | |
827 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
828 | (l_port != NULL) && (l_port == port)) | |
829 | continue; | |
830 | ||
831 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
832 | se_deve->mapped_lun, 0x2A, | |
833 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
834 | } | |
835 | spin_unlock_bh(&port->sep_alua_lock); | |
836 | ||
837 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
838 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
839 | smp_mb__after_atomic_dec(); | |
840 | } | |
841 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
842 | /* | |
843 | * Update the ALUA metadata buf that has been allocated in | |
844 | * core_alua_do_port_transition(), this metadata will be written | |
845 | * to struct file. | |
846 | * | |
847 | * Note that there is the case where we do not want to update the | |
848 | * metadata when the saved metadata is being parsed in userspace | |
849 | * when setting the existing port access state and access status. | |
850 | * | |
851 | * Also note that the failure to write out the ALUA metadata to | |
852 | * struct file does NOT affect the actual ALUA transition. | |
853 | */ | |
854 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
855 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
856 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
857 | new_state, md_buf); | |
858 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
859 | } | |
860 | /* | |
861 | * Set the current primary ALUA access state to the requested new state | |
862 | */ | |
863 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
864 | ||
6708bb27 | 865 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
866 | " from primary access state %s to %s\n", (explict) ? "explict" : |
867 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
868 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
869 | core_alua_dump_state(new_state)); | |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
874 | int core_alua_do_port_transition( | |
875 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
876 | struct se_device *l_dev, | |
877 | struct se_port *l_port, | |
878 | struct se_node_acl *l_nacl, | |
879 | int new_state, | |
880 | int explict) | |
881 | { | |
882 | struct se_device *dev; | |
883 | struct se_port *port; | |
c66ac9db NB |
884 | struct se_node_acl *nacl; |
885 | struct t10_alua_lu_gp *lu_gp; | |
886 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
887 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
888 | unsigned char *md_buf; | |
889 | int primary; | |
890 | ||
891 | if (core_alua_check_transition(new_state, &primary) != 0) | |
892 | return -EINVAL; | |
893 | ||
894 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
895 | if (!md_buf) { |
896 | pr_err("Unable to allocate buf for ALUA metadata\n"); | |
c66ac9db NB |
897 | return -ENOMEM; |
898 | } | |
899 | ||
900 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
901 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
902 | lu_gp = local_lu_gp_mem->lu_gp; | |
903 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
904 | smp_mb__after_atomic_inc(); | |
905 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
906 | /* | |
907 | * For storage objects that are members of the 'default_lu_gp', | |
908 | * we only do transition on the passed *l_tp_pt_gp, and not | |
909 | * on all of the matching target port groups IDs in default_lu_gp. | |
910 | */ | |
6708bb27 | 911 | if (!lu_gp->lu_gp_id) { |
c66ac9db NB |
912 | /* |
913 | * core_alua_do_transition_tg_pt() will always return | |
914 | * success. | |
915 | */ | |
916 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
917 | md_buf, new_state, explict); | |
918 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
919 | smp_mb__after_atomic_dec(); | |
920 | kfree(md_buf); | |
921 | return 0; | |
922 | } | |
923 | /* | |
924 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
925 | * the associated storage objects looking for a matching target port | |
926 | * group ID from the local target port group. | |
927 | */ | |
928 | spin_lock(&lu_gp->lu_gp_lock); | |
929 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
930 | lu_gp_mem_list) { | |
931 | ||
932 | dev = lu_gp_mem->lu_gp_mem_dev; | |
c66ac9db NB |
933 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); |
934 | smp_mb__after_atomic_inc(); | |
935 | spin_unlock(&lu_gp->lu_gp_lock); | |
936 | ||
0fd97ccf | 937 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 938 | list_for_each_entry(tg_pt_gp, |
0fd97ccf | 939 | &dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
940 | tg_pt_gp_list) { |
941 | ||
6708bb27 | 942 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
943 | continue; |
944 | /* | |
945 | * If the target behavior port asymmetric access state | |
946 | * is changed for any target port group accessiable via | |
947 | * a logical unit within a LU group, the target port | |
948 | * behavior group asymmetric access states for the same | |
949 | * target port group accessible via other logical units | |
950 | * in that LU group will also change. | |
951 | */ | |
952 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
953 | continue; | |
954 | ||
955 | if (l_tg_pt_gp == tg_pt_gp) { | |
956 | port = l_port; | |
957 | nacl = l_nacl; | |
958 | } else { | |
959 | port = NULL; | |
960 | nacl = NULL; | |
961 | } | |
962 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
963 | smp_mb__after_atomic_inc(); | |
0fd97ccf | 964 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
965 | /* |
966 | * core_alua_do_transition_tg_pt() will always return | |
967 | * success. | |
968 | */ | |
969 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
970 | nacl, md_buf, new_state, explict); | |
971 | ||
0fd97ccf | 972 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
973 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
974 | smp_mb__after_atomic_dec(); | |
975 | } | |
0fd97ccf | 976 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
977 | |
978 | spin_lock(&lu_gp->lu_gp_lock); | |
979 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
980 | smp_mb__after_atomic_dec(); | |
981 | } | |
982 | spin_unlock(&lu_gp->lu_gp_lock); | |
983 | ||
6708bb27 | 984 | pr_debug("Successfully processed LU Group: %s all ALUA TG PT" |
c66ac9db NB |
985 | " Group IDs: %hu %s transition to primary state: %s\n", |
986 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
987 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
988 | core_alua_dump_state(new_state)); | |
989 | ||
990 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
991 | smp_mb__after_atomic_dec(); | |
992 | kfree(md_buf); | |
993 | return 0; | |
994 | } | |
995 | ||
996 | /* | |
997 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
998 | */ | |
999 | static int core_alua_update_tpg_secondary_metadata( | |
1000 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1001 | struct se_port *port, | |
1002 | unsigned char *md_buf, | |
1003 | u32 md_buf_len) | |
1004 | { | |
1005 | struct se_portal_group *se_tpg = port->sep_tpg; | |
1006 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
1007 | int len; | |
1008 | ||
1009 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
1010 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
1011 | ||
1012 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 1013 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 1014 | |
e3d6f909 | 1015 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 1016 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 1017 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
1018 | |
1019 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
1020 | "alua_tg_pt_status=0x%02x\n", | |
1021 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
1022 | port->sep_tg_pt_secondary_stat); | |
1023 | ||
1024 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 1025 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
1026 | port->sep_lun->unpacked_lun); |
1027 | ||
1028 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
1029 | } | |
1030 | ||
1031 | static int core_alua_set_tg_pt_secondary_state( | |
1032 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1033 | struct se_port *port, | |
1034 | int explict, | |
1035 | int offline) | |
1036 | { | |
1037 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1038 | unsigned char *md_buf; | |
1039 | u32 md_buf_len; | |
1040 | int trans_delay_msecs; | |
1041 | ||
1042 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1043 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1044 | if (!tg_pt_gp) { |
c66ac9db | 1045 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
6708bb27 | 1046 | pr_err("Unable to complete secondary state" |
c66ac9db | 1047 | " transition\n"); |
e3d6f909 | 1048 | return -EINVAL; |
c66ac9db NB |
1049 | } |
1050 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
1051 | /* | |
1052 | * Set the secondary ALUA target port access state to OFFLINE | |
1053 | * or release the previously secondary state for struct se_port | |
1054 | */ | |
1055 | if (offline) | |
1056 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
1057 | else | |
1058 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
1059 | ||
1060 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1061 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1062 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1063 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1064 | ||
6708bb27 | 1065 | pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu" |
c66ac9db NB |
1066 | " to secondary access state: %s\n", (explict) ? "explict" : |
1067 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1068 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1069 | ||
1070 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1071 | /* | |
1072 | * Do the optional transition delay after we set the secondary | |
1073 | * ALUA access state. | |
1074 | */ | |
1075 | if (trans_delay_msecs != 0) | |
1076 | msleep_interruptible(trans_delay_msecs); | |
1077 | /* | |
1078 | * See if we need to update the ALUA fabric port metadata for | |
1079 | * secondary state and status | |
1080 | */ | |
1081 | if (port->sep_tg_pt_secondary_write_md) { | |
1082 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
6708bb27 AG |
1083 | if (!md_buf) { |
1084 | pr_err("Unable to allocate md_buf for" | |
c66ac9db | 1085 | " secondary ALUA access metadata\n"); |
e3d6f909 | 1086 | return -ENOMEM; |
c66ac9db NB |
1087 | } |
1088 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1089 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1090 | md_buf, md_buf_len); | |
1091 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1092 | ||
1093 | kfree(md_buf); | |
1094 | } | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | struct t10_alua_lu_gp * | |
1100 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1101 | { | |
1102 | struct t10_alua_lu_gp *lu_gp; | |
1103 | ||
1104 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1105 | if (!lu_gp) { |
1106 | pr_err("Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1107 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1108 | } |
e3d6f909 | 1109 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1110 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1111 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1112 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1113 | ||
1114 | if (def_group) { | |
e3d6f909 | 1115 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1116 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1117 | alua_lu_gps_count++; |
c66ac9db NB |
1118 | } |
1119 | ||
1120 | return lu_gp; | |
1121 | } | |
1122 | ||
1123 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1124 | { | |
1125 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1126 | u16 lu_gp_id_tmp; | |
1127 | /* | |
1128 | * The lu_gp->lu_gp_id may only be set once.. | |
1129 | */ | |
1130 | if (lu_gp->lu_gp_valid_id) { | |
6708bb27 | 1131 | pr_warn("ALUA LU Group already has a valid ID," |
c66ac9db | 1132 | " ignoring request\n"); |
e3d6f909 | 1133 | return -EINVAL; |
c66ac9db NB |
1134 | } |
1135 | ||
e3d6f909 AG |
1136 | spin_lock(&lu_gps_lock); |
1137 | if (alua_lu_gps_count == 0x0000ffff) { | |
6708bb27 | 1138 | pr_err("Maximum ALUA alua_lu_gps_count:" |
c66ac9db | 1139 | " 0x0000ffff reached\n"); |
e3d6f909 | 1140 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1141 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1142 | return -ENOSPC; |
c66ac9db NB |
1143 | } |
1144 | again: | |
1145 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1146 | alua_lu_gps_counter++; |
c66ac9db | 1147 | |
e3d6f909 | 1148 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db | 1149 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
6708bb27 | 1150 | if (!lu_gp_id) |
c66ac9db NB |
1151 | goto again; |
1152 | ||
6708bb27 | 1153 | pr_warn("ALUA Logical Unit Group ID: %hu" |
c66ac9db NB |
1154 | " already exists, ignoring request\n", |
1155 | lu_gp_id); | |
e3d6f909 AG |
1156 | spin_unlock(&lu_gps_lock); |
1157 | return -EINVAL; | |
c66ac9db NB |
1158 | } |
1159 | } | |
1160 | ||
1161 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1162 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1163 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1164 | alua_lu_gps_count++; | |
1165 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1166 | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static struct t10_alua_lu_gp_member * | |
1171 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1172 | { | |
1173 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1174 | ||
1175 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
6708bb27 AG |
1176 | if (!lu_gp_mem) { |
1177 | pr_err("Unable to allocate struct t10_alua_lu_gp_member\n"); | |
c66ac9db NB |
1178 | return ERR_PTR(-ENOMEM); |
1179 | } | |
1180 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1181 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1182 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1183 | ||
1184 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1185 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1186 | ||
1187 | return lu_gp_mem; | |
1188 | } | |
1189 | ||
1190 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1191 | { | |
1192 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1193 | /* | |
1194 | * Once we have reached this point, config_item_put() has | |
1195 | * already been called from target_core_alua_drop_lu_gp(). | |
1196 | * | |
1197 | * Here, we remove the *lu_gp from the global list so that | |
1198 | * no associations can be made while we are releasing | |
1199 | * struct t10_alua_lu_gp. | |
1200 | */ | |
e3d6f909 | 1201 | spin_lock(&lu_gps_lock); |
e3d6f909 AG |
1202 | list_del(&lu_gp->lu_gp_node); |
1203 | alua_lu_gps_count--; | |
1204 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1205 | /* |
1206 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1207 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1208 | * released with core_alua_put_lu_gp_from_name() | |
1209 | */ | |
1210 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1211 | cpu_relax(); | |
1212 | /* | |
1213 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1214 | * struct se_device. | |
1215 | */ | |
1216 | spin_lock(&lu_gp->lu_gp_lock); | |
1217 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1218 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1219 | if (lu_gp_mem->lu_gp_assoc) { | |
1220 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1221 | lu_gp->lu_gp_members--; | |
1222 | lu_gp_mem->lu_gp_assoc = 0; | |
1223 | } | |
1224 | spin_unlock(&lu_gp->lu_gp_lock); | |
1225 | /* | |
1226 | * | |
25985edc | 1227 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1228 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1229 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1230 | * | |
1231 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1232 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1233 | */ | |
1234 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1235 | if (lu_gp != default_lu_gp) |
c66ac9db | 1236 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1237 | default_lu_gp); |
c66ac9db NB |
1238 | else |
1239 | lu_gp_mem->lu_gp = NULL; | |
1240 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1241 | ||
1242 | spin_lock(&lu_gp->lu_gp_lock); | |
1243 | } | |
1244 | spin_unlock(&lu_gp->lu_gp_lock); | |
1245 | ||
1246 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1247 | } | |
1248 | ||
1249 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1250 | { | |
c66ac9db NB |
1251 | struct t10_alua_lu_gp *lu_gp; |
1252 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1253 | ||
c66ac9db | 1254 | lu_gp_mem = dev->dev_alua_lu_gp_mem; |
6708bb27 | 1255 | if (!lu_gp_mem) |
c66ac9db NB |
1256 | return; |
1257 | ||
1258 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1259 | cpu_relax(); | |
1260 | ||
1261 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1262 | lu_gp = lu_gp_mem->lu_gp; | |
6708bb27 | 1263 | if (lu_gp) { |
c66ac9db NB |
1264 | spin_lock(&lu_gp->lu_gp_lock); |
1265 | if (lu_gp_mem->lu_gp_assoc) { | |
1266 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1267 | lu_gp->lu_gp_members--; | |
1268 | lu_gp_mem->lu_gp_assoc = 0; | |
1269 | } | |
1270 | spin_unlock(&lu_gp->lu_gp_lock); | |
1271 | lu_gp_mem->lu_gp = NULL; | |
1272 | } | |
1273 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1274 | ||
1275 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1276 | } | |
1277 | ||
1278 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1279 | { | |
1280 | struct t10_alua_lu_gp *lu_gp; | |
1281 | struct config_item *ci; | |
1282 | ||
e3d6f909 AG |
1283 | spin_lock(&lu_gps_lock); |
1284 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
6708bb27 | 1285 | if (!lu_gp->lu_gp_valid_id) |
c66ac9db NB |
1286 | continue; |
1287 | ci = &lu_gp->lu_gp_group.cg_item; | |
6708bb27 | 1288 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1289 | atomic_inc(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1290 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1291 | return lu_gp; |
1292 | } | |
1293 | } | |
e3d6f909 | 1294 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1295 | |
1296 | return NULL; | |
1297 | } | |
1298 | ||
1299 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1300 | { | |
e3d6f909 | 1301 | spin_lock(&lu_gps_lock); |
c66ac9db | 1302 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1303 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1304 | } |
1305 | ||
1306 | /* | |
1307 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1308 | */ | |
1309 | void __core_alua_attach_lu_gp_mem( | |
1310 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1311 | struct t10_alua_lu_gp *lu_gp) | |
1312 | { | |
1313 | spin_lock(&lu_gp->lu_gp_lock); | |
1314 | lu_gp_mem->lu_gp = lu_gp; | |
1315 | lu_gp_mem->lu_gp_assoc = 1; | |
1316 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1317 | lu_gp->lu_gp_members++; | |
1318 | spin_unlock(&lu_gp->lu_gp_lock); | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1323 | */ | |
1324 | void __core_alua_drop_lu_gp_mem( | |
1325 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1326 | struct t10_alua_lu_gp *lu_gp) | |
1327 | { | |
1328 | spin_lock(&lu_gp->lu_gp_lock); | |
1329 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1330 | lu_gp_mem->lu_gp = NULL; | |
1331 | lu_gp_mem->lu_gp_assoc = 0; | |
1332 | lu_gp->lu_gp_members--; | |
1333 | spin_unlock(&lu_gp->lu_gp_lock); | |
1334 | } | |
1335 | ||
0fd97ccf CH |
1336 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev, |
1337 | const char *name, int def_group) | |
c66ac9db NB |
1338 | { |
1339 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1340 | ||
1341 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
6708bb27 AG |
1342 | if (!tg_pt_gp) { |
1343 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
c66ac9db NB |
1344 | return NULL; |
1345 | } | |
1346 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1347 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1348 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1349 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1350 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
0fd97ccf | 1351 | tg_pt_gp->tg_pt_gp_dev = dev; |
c66ac9db NB |
1352 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; |
1353 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1354 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1355 | /* | |
1356 | * Enable both explict and implict ALUA support by default | |
1357 | */ | |
1358 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1359 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1360 | /* | |
1361 | * Set the default Active/NonOptimized Delay in milliseconds | |
1362 | */ | |
1363 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1364 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
5b9a4d72 | 1365 | tg_pt_gp->tg_pt_gp_implict_trans_secs = ALUA_DEFAULT_IMPLICT_TRANS_SECS; |
c66ac9db NB |
1366 | |
1367 | if (def_group) { | |
0fd97ccf | 1368 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1369 | tg_pt_gp->tg_pt_gp_id = |
0fd97ccf | 1370 | dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1371 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
0fd97ccf | 1372 | dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1373 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
0fd97ccf CH |
1374 | &dev->t10_alua.tg_pt_gps_list); |
1375 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1376 | } |
1377 | ||
1378 | return tg_pt_gp; | |
1379 | } | |
1380 | ||
1381 | int core_alua_set_tg_pt_gp_id( | |
1382 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1383 | u16 tg_pt_gp_id) | |
1384 | { | |
0fd97ccf | 1385 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db NB |
1386 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; |
1387 | u16 tg_pt_gp_id_tmp; | |
0fd97ccf | 1388 | |
c66ac9db NB |
1389 | /* |
1390 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1391 | */ | |
1392 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
6708bb27 | 1393 | pr_warn("ALUA TG PT Group already has a valid ID," |
c66ac9db | 1394 | " ignoring request\n"); |
e3d6f909 | 1395 | return -EINVAL; |
c66ac9db NB |
1396 | } |
1397 | ||
0fd97ccf CH |
1398 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
1399 | if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
6708bb27 | 1400 | pr_err("Maximum ALUA alua_tg_pt_gps_count:" |
c66ac9db | 1401 | " 0x0000ffff reached\n"); |
0fd97ccf | 1402 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1403 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1404 | return -ENOSPC; |
c66ac9db NB |
1405 | } |
1406 | again: | |
1407 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
0fd97ccf | 1408 | dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1409 | |
0fd97ccf | 1410 | list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1411 | tg_pt_gp_list) { |
1412 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
6708bb27 | 1413 | if (!tg_pt_gp_id) |
c66ac9db NB |
1414 | goto again; |
1415 | ||
6708bb27 | 1416 | pr_err("ALUA Target Port Group ID: %hu already" |
c66ac9db | 1417 | " exists, ignoring request\n", tg_pt_gp_id); |
0fd97ccf | 1418 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
e3d6f909 | 1419 | return -EINVAL; |
c66ac9db NB |
1420 | } |
1421 | } | |
1422 | ||
1423 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1424 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1425 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
0fd97ccf CH |
1426 | &dev->t10_alua.tg_pt_gps_list); |
1427 | dev->t10_alua.alua_tg_pt_gps_count++; | |
1428 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1429 | |
1430 | return 0; | |
1431 | } | |
1432 | ||
1433 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1434 | struct se_port *port) | |
1435 | { | |
1436 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1437 | ||
1438 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1439 | GFP_KERNEL); | |
6708bb27 AG |
1440 | if (!tg_pt_gp_mem) { |
1441 | pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
c66ac9db NB |
1442 | return ERR_PTR(-ENOMEM); |
1443 | } | |
1444 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1445 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1446 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1447 | ||
1448 | tg_pt_gp_mem->tg_pt = port; | |
1449 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
c66ac9db NB |
1450 | |
1451 | return tg_pt_gp_mem; | |
1452 | } | |
1453 | ||
1454 | void core_alua_free_tg_pt_gp( | |
1455 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1456 | { | |
0fd97ccf | 1457 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db | 1458 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; |
0fd97ccf | 1459 | |
c66ac9db NB |
1460 | /* |
1461 | * Once we have reached this point, config_item_put() has already | |
1462 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1463 | * | |
1464 | * Here we remove *tg_pt_gp from the global list so that | |
1465 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1466 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1467 | */ | |
0fd97ccf | 1468 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1469 | list_del(&tg_pt_gp->tg_pt_gp_list); |
0fd97ccf CH |
1470 | dev->t10_alua.alua_tg_pt_gps_counter--; |
1471 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); | |
1472 | ||
c66ac9db NB |
1473 | /* |
1474 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1475 | * core_alua_get_tg_pt_gp_by_name() in | |
1476 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1477 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1478 | */ | |
1479 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1480 | cpu_relax(); | |
0fd97ccf | 1481 | |
c66ac9db NB |
1482 | /* |
1483 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1484 | * struct se_port. | |
1485 | */ | |
1486 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1487 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1488 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1489 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1490 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1491 | tg_pt_gp->tg_pt_gp_members--; | |
1492 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1493 | } | |
1494 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1495 | /* | |
25985edc | 1496 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1497 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1498 | * core_alua_free_tg_pt_gp_mem(). | |
1499 | * | |
1500 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1501 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1502 | * default_tg_pt_gp. | |
1503 | */ | |
1504 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
0fd97ccf | 1505 | if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1506 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
0fd97ccf | 1507 | dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1508 | } else |
1509 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1510 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1511 | ||
1512 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1513 | } | |
1514 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1515 | ||
1516 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1517 | } | |
1518 | ||
1519 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1520 | { | |
c66ac9db NB |
1521 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1522 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1523 | ||
c66ac9db | 1524 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
6708bb27 | 1525 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1526 | return; |
1527 | ||
1528 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1529 | cpu_relax(); | |
1530 | ||
1531 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1532 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1533 | if (tg_pt_gp) { |
c66ac9db NB |
1534 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); |
1535 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1536 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1537 | tg_pt_gp->tg_pt_gp_members--; | |
1538 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1539 | } | |
1540 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1541 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1542 | } | |
1543 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1544 | ||
1545 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1546 | } | |
1547 | ||
1548 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
0fd97ccf | 1549 | struct se_device *dev, const char *name) |
c66ac9db NB |
1550 | { |
1551 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1552 | struct config_item *ci; | |
1553 | ||
0fd97ccf CH |
1554 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
1555 | list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list, | |
c66ac9db | 1556 | tg_pt_gp_list) { |
6708bb27 | 1557 | if (!tg_pt_gp->tg_pt_gp_valid_id) |
c66ac9db NB |
1558 | continue; |
1559 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
6708bb27 | 1560 | if (!strcmp(config_item_name(ci), name)) { |
c66ac9db | 1561 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); |
0fd97ccf | 1562 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1563 | return tg_pt_gp; |
1564 | } | |
1565 | } | |
0fd97ccf | 1566 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1567 | |
1568 | return NULL; | |
1569 | } | |
1570 | ||
1571 | static void core_alua_put_tg_pt_gp_from_name( | |
1572 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1573 | { | |
0fd97ccf | 1574 | struct se_device *dev = tg_pt_gp->tg_pt_gp_dev; |
c66ac9db | 1575 | |
0fd97ccf | 1576 | spin_lock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1577 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
0fd97ccf | 1578 | spin_unlock(&dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1579 | } |
1580 | ||
1581 | /* | |
1582 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1583 | */ | |
1584 | void __core_alua_attach_tg_pt_gp_mem( | |
1585 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1586 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1587 | { | |
1588 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1589 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1590 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1591 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1592 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1593 | tg_pt_gp->tg_pt_gp_members++; | |
1594 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1599 | */ | |
1600 | static void __core_alua_drop_tg_pt_gp_mem( | |
1601 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1602 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1603 | { | |
1604 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1605 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1606 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1607 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1608 | tg_pt_gp->tg_pt_gp_members--; | |
1609 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1610 | } | |
1611 | ||
1612 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1613 | { | |
c66ac9db | 1614 | struct config_item *tg_pt_ci; |
c66ac9db NB |
1615 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1616 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1617 | ssize_t len = 0; | |
1618 | ||
c66ac9db | 1619 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
6708bb27 | 1620 | if (!tg_pt_gp_mem) |
c66ac9db NB |
1621 | return len; |
1622 | ||
1623 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1624 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1625 | if (tg_pt_gp) { |
c66ac9db NB |
1626 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; |
1627 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1628 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1629 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1630 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1631 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1632 | core_alua_dump_state(atomic_read( | |
1633 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1634 | core_alua_dump_status( | |
1635 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1636 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1637 | "Offline" : "None", | |
1638 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1639 | } | |
1640 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1641 | ||
1642 | return len; | |
1643 | } | |
1644 | ||
1645 | ssize_t core_alua_store_tg_pt_gp_info( | |
1646 | struct se_port *port, | |
1647 | const char *page, | |
1648 | size_t count) | |
1649 | { | |
1650 | struct se_portal_group *tpg; | |
1651 | struct se_lun *lun; | |
0fd97ccf | 1652 | struct se_device *dev = port->sep_lun->lun_se_dev; |
c66ac9db NB |
1653 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; |
1654 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1655 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1656 | int move = 0; | |
1657 | ||
1658 | tpg = port->sep_tpg; | |
1659 | lun = port->sep_lun; | |
1660 | ||
c87fbd56 CH |
1661 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; |
1662 | if (!tg_pt_gp_mem) | |
1663 | return 0; | |
c66ac9db NB |
1664 | |
1665 | if (count > TG_PT_GROUP_NAME_BUF) { | |
6708bb27 | 1666 | pr_err("ALUA Target Port Group alias too large!\n"); |
c66ac9db NB |
1667 | return -EINVAL; |
1668 | } | |
1669 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1670 | memcpy(buf, page, count); | |
1671 | /* | |
1672 | * Any ALUA target port group alias besides "NULL" means we will be | |
1673 | * making a new group association. | |
1674 | */ | |
1675 | if (strcmp(strstrip(buf), "NULL")) { | |
1676 | /* | |
1677 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1678 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1679 | * core_alua_put_tg_pt_gp_from_name() below. | |
1680 | */ | |
0fd97ccf | 1681 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev, |
c66ac9db | 1682 | strstrip(buf)); |
6708bb27 | 1683 | if (!tg_pt_gp_new) |
c66ac9db NB |
1684 | return -ENODEV; |
1685 | } | |
c66ac9db NB |
1686 | |
1687 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1688 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
6708bb27 | 1689 | if (tg_pt_gp) { |
c66ac9db NB |
1690 | /* |
1691 | * Clearing an existing tg_pt_gp association, and replacing | |
1692 | * with the default_tg_pt_gp. | |
1693 | */ | |
6708bb27 AG |
1694 | if (!tg_pt_gp_new) { |
1695 | pr_debug("Target_Core_ConfigFS: Moving" | |
c66ac9db NB |
1696 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" |
1697 | " alua/%s, ID: %hu back to" | |
1698 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1699 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1700 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1701 | config_item_name(&lun->lun_group.cg_item), |
1702 | config_item_name( | |
1703 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1704 | tg_pt_gp->tg_pt_gp_id); | |
1705 | ||
1706 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1707 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
0fd97ccf | 1708 | dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1709 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1710 | ||
1711 | return count; | |
1712 | } | |
1713 | /* | |
1714 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1715 | */ | |
1716 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1717 | move = 1; | |
1718 | } | |
1719 | /* | |
1720 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1721 | */ | |
1722 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1723 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
6708bb27 | 1724 | pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" |
c66ac9db | 1725 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? |
e3d6f909 AG |
1726 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1727 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1728 | config_item_name(&lun->lun_group.cg_item), |
1729 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1730 | tg_pt_gp_new->tg_pt_gp_id); | |
1731 | ||
1732 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1733 | return count; | |
1734 | } | |
1735 | ||
1736 | ssize_t core_alua_show_access_type( | |
1737 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1738 | char *page) | |
1739 | { | |
1740 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1741 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1742 | return sprintf(page, "Implict and Explict\n"); | |
1743 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1744 | return sprintf(page, "Implict\n"); | |
1745 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1746 | return sprintf(page, "Explict\n"); | |
1747 | else | |
1748 | return sprintf(page, "None\n"); | |
1749 | } | |
1750 | ||
1751 | ssize_t core_alua_store_access_type( | |
1752 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1753 | const char *page, | |
1754 | size_t count) | |
1755 | { | |
1756 | unsigned long tmp; | |
1757 | int ret; | |
1758 | ||
1759 | ret = strict_strtoul(page, 0, &tmp); | |
1760 | if (ret < 0) { | |
6708bb27 | 1761 | pr_err("Unable to extract alua_access_type\n"); |
c66ac9db NB |
1762 | return -EINVAL; |
1763 | } | |
1764 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
6708bb27 | 1765 | pr_err("Illegal value for alua_access_type:" |
c66ac9db NB |
1766 | " %lu\n", tmp); |
1767 | return -EINVAL; | |
1768 | } | |
1769 | if (tmp == 3) | |
1770 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1771 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1772 | else if (tmp == 2) | |
1773 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1774 | else if (tmp == 1) | |
1775 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1776 | else | |
1777 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1778 | ||
1779 | return count; | |
1780 | } | |
1781 | ||
1782 | ssize_t core_alua_show_nonop_delay_msecs( | |
1783 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1784 | char *page) | |
1785 | { | |
1786 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1787 | } | |
1788 | ||
1789 | ssize_t core_alua_store_nonop_delay_msecs( | |
1790 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1791 | const char *page, | |
1792 | size_t count) | |
1793 | { | |
1794 | unsigned long tmp; | |
1795 | int ret; | |
1796 | ||
1797 | ret = strict_strtoul(page, 0, &tmp); | |
1798 | if (ret < 0) { | |
6708bb27 | 1799 | pr_err("Unable to extract nonop_delay_msecs\n"); |
c66ac9db NB |
1800 | return -EINVAL; |
1801 | } | |
1802 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
6708bb27 | 1803 | pr_err("Passed nonop_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1804 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, |
1805 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1806 | return -EINVAL; | |
1807 | } | |
1808 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1809 | ||
1810 | return count; | |
1811 | } | |
1812 | ||
1813 | ssize_t core_alua_show_trans_delay_msecs( | |
1814 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1815 | char *page) | |
1816 | { | |
1817 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
1818 | } | |
1819 | ||
1820 | ssize_t core_alua_store_trans_delay_msecs( | |
1821 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1822 | const char *page, | |
1823 | size_t count) | |
1824 | { | |
1825 | unsigned long tmp; | |
1826 | int ret; | |
1827 | ||
1828 | ret = strict_strtoul(page, 0, &tmp); | |
1829 | if (ret < 0) { | |
6708bb27 | 1830 | pr_err("Unable to extract trans_delay_msecs\n"); |
c66ac9db NB |
1831 | return -EINVAL; |
1832 | } | |
1833 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
6708bb27 | 1834 | pr_err("Passed trans_delay_msecs: %lu, exceeds" |
c66ac9db NB |
1835 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, |
1836 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1837 | return -EINVAL; | |
1838 | } | |
1839 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1840 | ||
1841 | return count; | |
1842 | } | |
1843 | ||
5b9a4d72 NB |
1844 | ssize_t core_alua_show_implict_trans_secs( |
1845 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1846 | char *page) | |
1847 | { | |
1848 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implict_trans_secs); | |
1849 | } | |
1850 | ||
1851 | ssize_t core_alua_store_implict_trans_secs( | |
1852 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1853 | const char *page, | |
1854 | size_t count) | |
1855 | { | |
1856 | unsigned long tmp; | |
1857 | int ret; | |
1858 | ||
1859 | ret = strict_strtoul(page, 0, &tmp); | |
1860 | if (ret < 0) { | |
1861 | pr_err("Unable to extract implict_trans_secs\n"); | |
1862 | return -EINVAL; | |
1863 | } | |
1864 | if (tmp > ALUA_MAX_IMPLICT_TRANS_SECS) { | |
1865 | pr_err("Passed implict_trans_secs: %lu, exceeds" | |
1866 | " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp, | |
1867 | ALUA_MAX_IMPLICT_TRANS_SECS); | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | tg_pt_gp->tg_pt_gp_implict_trans_secs = (int)tmp; | |
1871 | ||
1872 | return count; | |
1873 | } | |
1874 | ||
c66ac9db NB |
1875 | ssize_t core_alua_show_preferred_bit( |
1876 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1877 | char *page) | |
1878 | { | |
1879 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref); | |
1880 | } | |
1881 | ||
1882 | ssize_t core_alua_store_preferred_bit( | |
1883 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1884 | const char *page, | |
1885 | size_t count) | |
1886 | { | |
1887 | unsigned long tmp; | |
1888 | int ret; | |
1889 | ||
1890 | ret = strict_strtoul(page, 0, &tmp); | |
1891 | if (ret < 0) { | |
6708bb27 | 1892 | pr_err("Unable to extract preferred ALUA value\n"); |
c66ac9db NB |
1893 | return -EINVAL; |
1894 | } | |
1895 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1896 | pr_err("Illegal value for preferred ALUA: %lu\n", tmp); |
c66ac9db NB |
1897 | return -EINVAL; |
1898 | } | |
1899 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1900 | ||
1901 | return count; | |
1902 | } | |
1903 | ||
1904 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1905 | { | |
6708bb27 | 1906 | if (!lun->lun_sep) |
c66ac9db NB |
1907 | return -ENODEV; |
1908 | ||
1909 | return sprintf(page, "%d\n", | |
1910 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1911 | } | |
1912 | ||
1913 | ssize_t core_alua_store_offline_bit( | |
1914 | struct se_lun *lun, | |
1915 | const char *page, | |
1916 | size_t count) | |
1917 | { | |
1918 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1919 | unsigned long tmp; | |
1920 | int ret; | |
1921 | ||
6708bb27 | 1922 | if (!lun->lun_sep) |
c66ac9db NB |
1923 | return -ENODEV; |
1924 | ||
1925 | ret = strict_strtoul(page, 0, &tmp); | |
1926 | if (ret < 0) { | |
6708bb27 | 1927 | pr_err("Unable to extract alua_tg_pt_offline value\n"); |
c66ac9db NB |
1928 | return -EINVAL; |
1929 | } | |
1930 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 1931 | pr_err("Illegal value for alua_tg_pt_offline: %lu\n", |
c66ac9db NB |
1932 | tmp); |
1933 | return -EINVAL; | |
1934 | } | |
1935 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
6708bb27 AG |
1936 | if (!tg_pt_gp_mem) { |
1937 | pr_err("Unable to locate *tg_pt_gp_mem\n"); | |
c66ac9db NB |
1938 | return -EINVAL; |
1939 | } | |
1940 | ||
1941 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1942 | lun->lun_sep, 0, (int)tmp); | |
1943 | if (ret < 0) | |
1944 | return -EINVAL; | |
1945 | ||
1946 | return count; | |
1947 | } | |
1948 | ||
1949 | ssize_t core_alua_show_secondary_status( | |
1950 | struct se_lun *lun, | |
1951 | char *page) | |
1952 | { | |
1953 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1954 | } | |
1955 | ||
1956 | ssize_t core_alua_store_secondary_status( | |
1957 | struct se_lun *lun, | |
1958 | const char *page, | |
1959 | size_t count) | |
1960 | { | |
1961 | unsigned long tmp; | |
1962 | int ret; | |
1963 | ||
1964 | ret = strict_strtoul(page, 0, &tmp); | |
1965 | if (ret < 0) { | |
6708bb27 | 1966 | pr_err("Unable to extract alua_tg_pt_status\n"); |
c66ac9db NB |
1967 | return -EINVAL; |
1968 | } | |
1969 | if ((tmp != ALUA_STATUS_NONE) && | |
1970 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1971 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
6708bb27 | 1972 | pr_err("Illegal value for alua_tg_pt_status: %lu\n", |
c66ac9db NB |
1973 | tmp); |
1974 | return -EINVAL; | |
1975 | } | |
1976 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
1977 | ||
1978 | return count; | |
1979 | } | |
1980 | ||
1981 | ssize_t core_alua_show_secondary_write_metadata( | |
1982 | struct se_lun *lun, | |
1983 | char *page) | |
1984 | { | |
1985 | return sprintf(page, "%d\n", | |
1986 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
1987 | } | |
1988 | ||
1989 | ssize_t core_alua_store_secondary_write_metadata( | |
1990 | struct se_lun *lun, | |
1991 | const char *page, | |
1992 | size_t count) | |
1993 | { | |
1994 | unsigned long tmp; | |
1995 | int ret; | |
1996 | ||
1997 | ret = strict_strtoul(page, 0, &tmp); | |
1998 | if (ret < 0) { | |
6708bb27 | 1999 | pr_err("Unable to extract alua_tg_pt_write_md\n"); |
c66ac9db NB |
2000 | return -EINVAL; |
2001 | } | |
2002 | if ((tmp != 0) && (tmp != 1)) { | |
6708bb27 | 2003 | pr_err("Illegal value for alua_tg_pt_write_md:" |
c66ac9db NB |
2004 | " %lu\n", tmp); |
2005 | return -EINVAL; | |
2006 | } | |
2007 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
2008 | ||
2009 | return count; | |
2010 | } | |
2011 | ||
0fd97ccf | 2012 | int core_setup_alua(struct se_device *dev) |
c66ac9db | 2013 | { |
c87fbd56 CH |
2014 | if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV && |
2015 | !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) { | |
2016 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
0fd97ccf | 2017 | |
c66ac9db | 2018 | /* |
25985edc | 2019 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
2020 | * LUN Group. |
2021 | */ | |
2022 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
2023 | if (IS_ERR(lu_gp_mem)) |
2024 | return PTR_ERR(lu_gp_mem); | |
c66ac9db | 2025 | |
c66ac9db NB |
2026 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); |
2027 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 2028 | default_lu_gp); |
c66ac9db NB |
2029 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
2030 | ||
6708bb27 | 2031 | pr_debug("%s: Adding to default ALUA LU Group:" |
c66ac9db | 2032 | " core/alua/lu_gps/default_lu_gp\n", |
e3d6f909 | 2033 | dev->transport->name); |
c66ac9db NB |
2034 | } |
2035 | ||
2036 | return 0; | |
2037 | } |