]>
Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_alua.c | |
3 | * | |
4 | * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA) | |
5 | * | |
6 | * Copyright (c) 2009-2010 Rising Tide Systems | |
7 | * Copyright (c) 2009-2010 Linux-iSCSI.org | |
8 | * | |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
27 | #include <linux/version.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/configfs.h> | |
31 | #include <scsi/scsi.h> | |
32 | #include <scsi/scsi_cmnd.h> | |
33 | ||
34 | #include <target/target_core_base.h> | |
35 | #include <target/target_core_device.h> | |
36 | #include <target/target_core_transport.h> | |
37 | #include <target/target_core_fabric_ops.h> | |
38 | #include <target/target_core_configfs.h> | |
39 | ||
40 | #include "target_core_alua.h" | |
41 | #include "target_core_hba.h" | |
42 | #include "target_core_ua.h" | |
43 | ||
44 | static int core_alua_check_transition(int state, int *primary); | |
45 | static int core_alua_set_tg_pt_secondary_state( | |
46 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
47 | struct se_port *port, int explict, int offline); | |
48 | ||
e3d6f909 AG |
49 | static u16 alua_lu_gps_counter; |
50 | static u32 alua_lu_gps_count; | |
51 | ||
52 | static DEFINE_SPINLOCK(lu_gps_lock); | |
53 | static LIST_HEAD(lu_gps_list); | |
54 | ||
55 | struct t10_alua_lu_gp *default_lu_gp; | |
56 | ||
c66ac9db NB |
57 | /* |
58 | * REPORT_TARGET_PORT_GROUPS | |
59 | * | |
60 | * See spc4r17 section 6.27 | |
61 | */ | |
62 | int core_emulate_report_target_port_groups(struct se_cmd *cmd) | |
63 | { | |
5951146d | 64 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
c66ac9db NB |
65 | struct se_port *port; |
66 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
67 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
a1d8b49a | 68 | unsigned char *buf = (unsigned char *)cmd->t_task_buf; |
c66ac9db NB |
69 | u32 rd_len = 0, off = 4; /* Skip over RESERVED area to first |
70 | Target port group descriptor */ | |
71 | ||
e3d6f909 AG |
72 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
73 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db NB |
74 | tg_pt_gp_list) { |
75 | /* | |
76 | * PREF: Preferred target port bit, determine if this | |
77 | * bit should be set for port group. | |
78 | */ | |
79 | if (tg_pt_gp->tg_pt_gp_pref) | |
80 | buf[off] = 0x80; | |
81 | /* | |
82 | * Set the ASYMMETRIC ACCESS State | |
83 | */ | |
84 | buf[off++] |= (atomic_read( | |
85 | &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff); | |
86 | /* | |
87 | * Set supported ASYMMETRIC ACCESS State bits | |
88 | */ | |
89 | buf[off] = 0x80; /* T_SUP */ | |
90 | buf[off] |= 0x40; /* O_SUP */ | |
91 | buf[off] |= 0x8; /* U_SUP */ | |
92 | buf[off] |= 0x4; /* S_SUP */ | |
93 | buf[off] |= 0x2; /* AN_SUP */ | |
94 | buf[off++] |= 0x1; /* AO_SUP */ | |
95 | /* | |
96 | * TARGET PORT GROUP | |
97 | */ | |
98 | buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff); | |
99 | buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff); | |
100 | ||
101 | off++; /* Skip over Reserved */ | |
102 | /* | |
103 | * STATUS CODE | |
104 | */ | |
105 | buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff); | |
106 | /* | |
107 | * Vendor Specific field | |
108 | */ | |
109 | buf[off++] = 0x00; | |
110 | /* | |
111 | * TARGET PORT COUNT | |
112 | */ | |
113 | buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff); | |
114 | rd_len += 8; | |
115 | ||
116 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
117 | list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
118 | tg_pt_gp_mem_list) { | |
119 | port = tg_pt_gp_mem->tg_pt; | |
120 | /* | |
121 | * Start Target Port descriptor format | |
122 | * | |
123 | * See spc4r17 section 6.2.7 Table 247 | |
124 | */ | |
125 | off += 2; /* Skip over Obsolete */ | |
126 | /* | |
127 | * Set RELATIVE TARGET PORT IDENTIFIER | |
128 | */ | |
129 | buf[off++] = ((port->sep_rtpi >> 8) & 0xff); | |
130 | buf[off++] = (port->sep_rtpi & 0xff); | |
131 | rd_len += 4; | |
132 | } | |
133 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
134 | } | |
e3d6f909 | 135 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
136 | /* |
137 | * Set the RETURN DATA LENGTH set in the header of the DataIN Payload | |
138 | */ | |
139 | buf[0] = ((rd_len >> 24) & 0xff); | |
140 | buf[1] = ((rd_len >> 16) & 0xff); | |
141 | buf[2] = ((rd_len >> 8) & 0xff); | |
142 | buf[3] = (rd_len & 0xff); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | /* | |
148 | * SET_TARGET_PORT_GROUPS for explict ALUA operation. | |
149 | * | |
150 | * See spc4r17 section 6.35 | |
151 | */ | |
152 | int core_emulate_set_target_port_groups(struct se_cmd *cmd) | |
153 | { | |
5951146d | 154 | struct se_device *dev = cmd->se_dev; |
e3d6f909 AG |
155 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
156 | struct se_port *port, *l_port = cmd->se_lun->lun_sep; | |
157 | struct se_node_acl *nacl = cmd->se_sess->se_node_acl; | |
c66ac9db NB |
158 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp; |
159 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem; | |
a1d8b49a | 160 | unsigned char *buf = (unsigned char *)cmd->t_task_buf; |
c66ac9db NB |
161 | unsigned char *ptr = &buf[4]; /* Skip over RESERVED area in header */ |
162 | u32 len = 4; /* Skip over RESERVED area in header */ | |
163 | int alua_access_state, primary = 0, rc; | |
164 | u16 tg_pt_id, rtpi; | |
165 | ||
166 | if (!(l_port)) | |
167 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
168 | /* | |
169 | * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed | |
170 | * for the local tg_pt_gp. | |
171 | */ | |
172 | l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem; | |
173 | if (!(l_tg_pt_gp_mem)) { | |
174 | printk(KERN_ERR "Unable to access l_port->sep_alua_tg_pt_gp_mem\n"); | |
175 | return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
176 | } | |
177 | spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
178 | l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp; | |
179 | if (!(l_tg_pt_gp)) { | |
180 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
181 | printk(KERN_ERR "Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n"); | |
182 | return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
183 | } | |
184 | rc = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA); | |
185 | spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
186 | ||
187 | if (!(rc)) { | |
188 | printk(KERN_INFO "Unable to process SET_TARGET_PORT_GROUPS" | |
189 | " while TPGS_EXPLICT_ALUA is disabled\n"); | |
190 | return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; | |
191 | } | |
192 | ||
193 | while (len < cmd->data_length) { | |
194 | alua_access_state = (ptr[0] & 0x0f); | |
195 | /* | |
196 | * Check the received ALUA access state, and determine if | |
197 | * the state is a primary or secondary target port asymmetric | |
198 | * access state. | |
199 | */ | |
200 | rc = core_alua_check_transition(alua_access_state, &primary); | |
201 | if (rc != 0) { | |
202 | /* | |
203 | * If the SET TARGET PORT GROUPS attempts to establish | |
204 | * an invalid combination of target port asymmetric | |
205 | * access states or attempts to establish an | |
206 | * unsupported target port asymmetric access state, | |
207 | * then the command shall be terminated with CHECK | |
208 | * CONDITION status, with the sense key set to ILLEGAL | |
209 | * REQUEST, and the additional sense code set to INVALID | |
210 | * FIELD IN PARAMETER LIST. | |
211 | */ | |
212 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
213 | } | |
214 | rc = -1; | |
215 | /* | |
216 | * If the ASYMMETRIC ACCESS STATE field (see table 267) | |
217 | * specifies a primary target port asymmetric access state, | |
218 | * then the TARGET PORT GROUP OR TARGET PORT field specifies | |
219 | * a primary target port group for which the primary target | |
220 | * port asymmetric access state shall be changed. If the | |
221 | * ASYMMETRIC ACCESS STATE field specifies a secondary target | |
222 | * port asymmetric access state, then the TARGET PORT GROUP OR | |
223 | * TARGET PORT field specifies the relative target port | |
224 | * identifier (see 3.1.120) of the target port for which the | |
225 | * secondary target port asymmetric access state shall be | |
226 | * changed. | |
227 | */ | |
228 | if (primary) { | |
229 | tg_pt_id = ((ptr[2] << 8) & 0xff); | |
230 | tg_pt_id |= (ptr[3] & 0xff); | |
231 | /* | |
232 | * Locate the matching target port group ID from | |
233 | * the global tg_pt_gp list | |
234 | */ | |
e3d6f909 | 235 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 236 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 237 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
238 | tg_pt_gp_list) { |
239 | if (!(tg_pt_gp->tg_pt_gp_valid_id)) | |
240 | continue; | |
241 | ||
242 | if (tg_pt_id != tg_pt_gp->tg_pt_gp_id) | |
243 | continue; | |
244 | ||
245 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
246 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 247 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
248 | |
249 | rc = core_alua_do_port_transition(tg_pt_gp, | |
250 | dev, l_port, nacl, | |
251 | alua_access_state, 1); | |
252 | ||
e3d6f909 | 253 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
254 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
255 | smp_mb__after_atomic_dec(); | |
256 | break; | |
257 | } | |
e3d6f909 | 258 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
259 | /* |
260 | * If not matching target port group ID can be located | |
261 | * throw an exception with ASCQ: INVALID_PARAMETER_LIST | |
262 | */ | |
263 | if (rc != 0) | |
264 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
265 | } else { | |
266 | /* | |
267 | * Extact the RELATIVE TARGET PORT IDENTIFIER to identify | |
268 | * the Target Port in question for the the incoming | |
269 | * SET_TARGET_PORT_GROUPS op. | |
270 | */ | |
271 | rtpi = ((ptr[2] << 8) & 0xff); | |
272 | rtpi |= (ptr[3] & 0xff); | |
273 | /* | |
274 | * Locate the matching relative target port identifer | |
275 | * for the struct se_device storage object. | |
276 | */ | |
277 | spin_lock(&dev->se_port_lock); | |
278 | list_for_each_entry(port, &dev->dev_sep_list, | |
279 | sep_list) { | |
280 | if (port->sep_rtpi != rtpi) | |
281 | continue; | |
282 | ||
283 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
284 | spin_unlock(&dev->se_port_lock); | |
285 | ||
286 | rc = core_alua_set_tg_pt_secondary_state( | |
287 | tg_pt_gp_mem, port, 1, 1); | |
288 | ||
289 | spin_lock(&dev->se_port_lock); | |
290 | break; | |
291 | } | |
292 | spin_unlock(&dev->se_port_lock); | |
293 | /* | |
294 | * If not matching relative target port identifier can | |
295 | * be located, throw an exception with ASCQ: | |
296 | * INVALID_PARAMETER_LIST | |
297 | */ | |
298 | if (rc != 0) | |
299 | return PYX_TRANSPORT_INVALID_PARAMETER_LIST; | |
300 | } | |
301 | ||
302 | ptr += 4; | |
303 | len += 4; | |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static inline int core_alua_state_nonoptimized( | |
310 | struct se_cmd *cmd, | |
311 | unsigned char *cdb, | |
312 | int nonop_delay_msecs, | |
313 | u8 *alua_ascq) | |
314 | { | |
315 | /* | |
316 | * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked | |
317 | * later to determine if processing of this cmd needs to be | |
318 | * temporarily delayed for the Active/NonOptimized primary access state. | |
319 | */ | |
320 | cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED; | |
321 | cmd->alua_nonop_delay = nonop_delay_msecs; | |
322 | return 0; | |
323 | } | |
324 | ||
325 | static inline int core_alua_state_standby( | |
326 | struct se_cmd *cmd, | |
327 | unsigned char *cdb, | |
328 | u8 *alua_ascq) | |
329 | { | |
330 | /* | |
331 | * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by | |
332 | * spc4r17 section 5.9.2.4.4 | |
333 | */ | |
334 | switch (cdb[0]) { | |
335 | case INQUIRY: | |
336 | case LOG_SELECT: | |
337 | case LOG_SENSE: | |
338 | case MODE_SELECT: | |
339 | case MODE_SENSE: | |
340 | case REPORT_LUNS: | |
341 | case RECEIVE_DIAGNOSTIC: | |
342 | case SEND_DIAGNOSTIC: | |
343 | case MAINTENANCE_IN: | |
344 | switch (cdb[1]) { | |
345 | case MI_REPORT_TARGET_PGS: | |
346 | return 0; | |
347 | default: | |
348 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
349 | return 1; | |
350 | } | |
351 | case MAINTENANCE_OUT: | |
352 | switch (cdb[1]) { | |
353 | case MO_SET_TARGET_PGS: | |
354 | return 0; | |
355 | default: | |
356 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
357 | return 1; | |
358 | } | |
359 | case REQUEST_SENSE: | |
360 | case PERSISTENT_RESERVE_IN: | |
361 | case PERSISTENT_RESERVE_OUT: | |
362 | case READ_BUFFER: | |
363 | case WRITE_BUFFER: | |
364 | return 0; | |
365 | default: | |
366 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY; | |
367 | return 1; | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static inline int core_alua_state_unavailable( | |
374 | struct se_cmd *cmd, | |
375 | unsigned char *cdb, | |
376 | u8 *alua_ascq) | |
377 | { | |
378 | /* | |
379 | * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by | |
380 | * spc4r17 section 5.9.2.4.5 | |
381 | */ | |
382 | switch (cdb[0]) { | |
383 | case INQUIRY: | |
384 | case REPORT_LUNS: | |
385 | case MAINTENANCE_IN: | |
386 | switch (cdb[1]) { | |
387 | case MI_REPORT_TARGET_PGS: | |
388 | return 0; | |
389 | default: | |
390 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
391 | return 1; | |
392 | } | |
393 | case MAINTENANCE_OUT: | |
394 | switch (cdb[1]) { | |
395 | case MO_SET_TARGET_PGS: | |
396 | return 0; | |
397 | default: | |
398 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
399 | return 1; | |
400 | } | |
401 | case REQUEST_SENSE: | |
402 | case READ_BUFFER: | |
403 | case WRITE_BUFFER: | |
404 | return 0; | |
405 | default: | |
406 | *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE; | |
407 | return 1; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static inline int core_alua_state_transition( | |
414 | struct se_cmd *cmd, | |
415 | unsigned char *cdb, | |
416 | u8 *alua_ascq) | |
417 | { | |
418 | /* | |
419 | * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by | |
420 | * spc4r17 section 5.9.2.5 | |
421 | */ | |
422 | switch (cdb[0]) { | |
423 | case INQUIRY: | |
424 | case REPORT_LUNS: | |
425 | case MAINTENANCE_IN: | |
426 | switch (cdb[1]) { | |
427 | case MI_REPORT_TARGET_PGS: | |
428 | return 0; | |
429 | default: | |
430 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
431 | return 1; | |
432 | } | |
433 | case REQUEST_SENSE: | |
434 | case READ_BUFFER: | |
435 | case WRITE_BUFFER: | |
436 | return 0; | |
437 | default: | |
438 | *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION; | |
439 | return 1; | |
440 | } | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED | |
447 | * in transport_cmd_sequencer(). This function is assigned to | |
448 | * struct t10_alua *->state_check() in core_setup_alua() | |
449 | */ | |
450 | static int core_alua_state_check_nop( | |
451 | struct se_cmd *cmd, | |
452 | unsigned char *cdb, | |
453 | u8 *alua_ascq) | |
454 | { | |
455 | return 0; | |
456 | } | |
457 | ||
458 | /* | |
459 | * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer(). | |
460 | * This function is assigned to struct t10_alua *->state_check() in | |
461 | * core_setup_alua() | |
462 | * | |
463 | * Also, this function can return three different return codes to | |
464 | * signal transport_generic_cmd_sequencer() | |
465 | * | |
466 | * return 1: Is used to signal LUN not accecsable, and check condition/not ready | |
467 | * return 0: Used to signal success | |
468 | * reutrn -1: Used to signal failure, and invalid cdb field | |
469 | */ | |
470 | static int core_alua_state_check( | |
471 | struct se_cmd *cmd, | |
472 | unsigned char *cdb, | |
473 | u8 *alua_ascq) | |
474 | { | |
e3d6f909 | 475 | struct se_lun *lun = cmd->se_lun; |
c66ac9db NB |
476 | struct se_port *port = lun->lun_sep; |
477 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
478 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
479 | int out_alua_state, nonop_delay_msecs; | |
480 | ||
481 | if (!(port)) | |
482 | return 0; | |
483 | /* | |
484 | * First, check for a struct se_port specific secondary ALUA target port | |
485 | * access state: OFFLINE | |
486 | */ | |
487 | if (atomic_read(&port->sep_tg_pt_secondary_offline)) { | |
488 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
489 | printk(KERN_INFO "ALUA: Got secondary offline status for local" | |
490 | " target port\n"); | |
491 | *alua_ascq = ASCQ_04H_ALUA_OFFLINE; | |
492 | return 1; | |
493 | } | |
494 | /* | |
495 | * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the | |
496 | * ALUA target port group, to obtain current ALUA access state. | |
497 | * Otherwise look for the underlying struct se_device association with | |
498 | * a ALUA logical unit group. | |
499 | */ | |
500 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
501 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
502 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
503 | out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
504 | nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs; | |
505 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
506 | /* | |
25985edc LDM |
507 | * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional |
508 | * statement so the compiler knows explicitly to check this case first. | |
c66ac9db NB |
509 | * For the Optimized ALUA access state case, we want to process the |
510 | * incoming fabric cmd ASAP.. | |
511 | */ | |
512 | if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED) | |
513 | return 0; | |
514 | ||
515 | switch (out_alua_state) { | |
516 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
517 | return core_alua_state_nonoptimized(cmd, cdb, | |
518 | nonop_delay_msecs, alua_ascq); | |
519 | case ALUA_ACCESS_STATE_STANDBY: | |
520 | return core_alua_state_standby(cmd, cdb, alua_ascq); | |
521 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
522 | return core_alua_state_unavailable(cmd, cdb, alua_ascq); | |
523 | case ALUA_ACCESS_STATE_TRANSITION: | |
524 | return core_alua_state_transition(cmd, cdb, alua_ascq); | |
525 | /* | |
526 | * OFFLINE is a secondary ALUA target port group access state, that is | |
527 | * handled above with struct se_port->sep_tg_pt_secondary_offline=1 | |
528 | */ | |
529 | case ALUA_ACCESS_STATE_OFFLINE: | |
530 | default: | |
531 | printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", | |
532 | out_alua_state); | |
e3d6f909 | 533 | return -EINVAL; |
c66ac9db NB |
534 | } |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | /* | |
540 | * Check implict and explict ALUA state change request. | |
541 | */ | |
542 | static int core_alua_check_transition(int state, int *primary) | |
543 | { | |
544 | switch (state) { | |
545 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
546 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
547 | case ALUA_ACCESS_STATE_STANDBY: | |
548 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
549 | /* | |
550 | * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are | |
551 | * defined as primary target port asymmetric access states. | |
552 | */ | |
553 | *primary = 1; | |
554 | break; | |
555 | case ALUA_ACCESS_STATE_OFFLINE: | |
556 | /* | |
557 | * OFFLINE state is defined as a secondary target port | |
558 | * asymmetric access state. | |
559 | */ | |
560 | *primary = 0; | |
561 | break; | |
562 | default: | |
563 | printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", state); | |
e3d6f909 | 564 | return -EINVAL; |
c66ac9db NB |
565 | } |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static char *core_alua_dump_state(int state) | |
571 | { | |
572 | switch (state) { | |
573 | case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED: | |
574 | return "Active/Optimized"; | |
575 | case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: | |
576 | return "Active/NonOptimized"; | |
577 | case ALUA_ACCESS_STATE_STANDBY: | |
578 | return "Standby"; | |
579 | case ALUA_ACCESS_STATE_UNAVAILABLE: | |
580 | return "Unavailable"; | |
581 | case ALUA_ACCESS_STATE_OFFLINE: | |
582 | return "Offline"; | |
583 | default: | |
584 | return "Unknown"; | |
585 | } | |
586 | ||
587 | return NULL; | |
588 | } | |
589 | ||
590 | char *core_alua_dump_status(int status) | |
591 | { | |
592 | switch (status) { | |
593 | case ALUA_STATUS_NONE: | |
594 | return "None"; | |
595 | case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG: | |
596 | return "Altered by Explict STPG"; | |
597 | case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA: | |
598 | return "Altered by Implict ALUA"; | |
599 | default: | |
600 | return "Unknown"; | |
601 | } | |
602 | ||
603 | return NULL; | |
604 | } | |
605 | ||
606 | /* | |
607 | * Used by fabric modules to determine when we need to delay processing | |
608 | * for the Active/NonOptimized paths.. | |
609 | */ | |
610 | int core_alua_check_nonop_delay( | |
611 | struct se_cmd *cmd) | |
612 | { | |
613 | if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED)) | |
614 | return 0; | |
615 | if (in_interrupt()) | |
616 | return 0; | |
617 | /* | |
618 | * The ALUA Active/NonOptimized access state delay can be disabled | |
619 | * in via configfs with a value of zero | |
620 | */ | |
621 | if (!(cmd->alua_nonop_delay)) | |
622 | return 0; | |
623 | /* | |
624 | * struct se_cmd->alua_nonop_delay gets set by a target port group | |
625 | * defined interval in core_alua_state_nonoptimized() | |
626 | */ | |
627 | msleep_interruptible(cmd->alua_nonop_delay); | |
628 | return 0; | |
629 | } | |
630 | EXPORT_SYMBOL(core_alua_check_nonop_delay); | |
631 | ||
632 | /* | |
633 | * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex | |
634 | * | |
635 | */ | |
636 | static int core_alua_write_tpg_metadata( | |
637 | const char *path, | |
638 | unsigned char *md_buf, | |
639 | u32 md_buf_len) | |
640 | { | |
641 | mm_segment_t old_fs; | |
642 | struct file *file; | |
643 | struct iovec iov[1]; | |
644 | int flags = O_RDWR | O_CREAT | O_TRUNC, ret; | |
645 | ||
646 | memset(iov, 0, sizeof(struct iovec)); | |
647 | ||
648 | file = filp_open(path, flags, 0600); | |
649 | if (IS_ERR(file) || !file || !file->f_dentry) { | |
650 | printk(KERN_ERR "filp_open(%s) for ALUA metadata failed\n", | |
651 | path); | |
652 | return -ENODEV; | |
653 | } | |
654 | ||
655 | iov[0].iov_base = &md_buf[0]; | |
656 | iov[0].iov_len = md_buf_len; | |
657 | ||
658 | old_fs = get_fs(); | |
659 | set_fs(get_ds()); | |
660 | ret = vfs_writev(file, &iov[0], 1, &file->f_pos); | |
661 | set_fs(old_fs); | |
662 | ||
663 | if (ret < 0) { | |
664 | printk(KERN_ERR "Error writing ALUA metadata file: %s\n", path); | |
665 | filp_close(file, NULL); | |
666 | return -EIO; | |
667 | } | |
668 | filp_close(file, NULL); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | /* | |
674 | * Called with tg_pt_gp->tg_pt_gp_md_mutex held | |
675 | */ | |
676 | static int core_alua_update_tpg_primary_metadata( | |
677 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
678 | int primary_state, | |
679 | unsigned char *md_buf) | |
680 | { | |
681 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
682 | struct t10_wwn *wwn = &su_dev->t10_wwn; | |
683 | char path[ALUA_METADATA_PATH_LEN]; | |
684 | int len; | |
685 | ||
686 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
687 | ||
688 | len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len, | |
689 | "tg_pt_gp_id=%hu\n" | |
690 | "alua_access_state=0x%02x\n" | |
691 | "alua_access_status=0x%02x\n", | |
692 | tg_pt_gp->tg_pt_gp_id, primary_state, | |
693 | tg_pt_gp->tg_pt_gp_alua_access_status); | |
694 | ||
695 | snprintf(path, ALUA_METADATA_PATH_LEN, | |
696 | "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0], | |
697 | config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item)); | |
698 | ||
699 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
700 | } | |
701 | ||
702 | static int core_alua_do_transition_tg_pt( | |
703 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
704 | struct se_port *l_port, | |
705 | struct se_node_acl *nacl, | |
706 | unsigned char *md_buf, | |
707 | int new_state, | |
708 | int explict) | |
709 | { | |
710 | struct se_dev_entry *se_deve; | |
711 | struct se_lun_acl *lacl; | |
712 | struct se_port *port; | |
713 | struct t10_alua_tg_pt_gp_member *mem; | |
714 | int old_state = 0; | |
715 | /* | |
716 | * Save the old primary ALUA access state, and set the current state | |
717 | * to ALUA_ACCESS_STATE_TRANSITION. | |
718 | */ | |
719 | old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state); | |
720 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
721 | ALUA_ACCESS_STATE_TRANSITION); | |
722 | tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ? | |
723 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
724 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
725 | /* | |
726 | * Check for the optional ALUA primary state transition delay | |
727 | */ | |
728 | if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0) | |
729 | msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs); | |
730 | ||
731 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
732 | list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list, | |
733 | tg_pt_gp_mem_list) { | |
734 | port = mem->tg_pt; | |
735 | /* | |
736 | * After an implicit target port asymmetric access state | |
737 | * change, a device server shall establish a unit attention | |
738 | * condition for the initiator port associated with every I_T | |
739 | * nexus with the additional sense code set to ASYMMETRIC | |
740 | * ACCESS STATE CHAGED. | |
741 | * | |
742 | * After an explicit target port asymmetric access state | |
743 | * change, a device server shall establish a unit attention | |
744 | * condition with the additional sense code set to ASYMMETRIC | |
745 | * ACCESS STATE CHANGED for the initiator port associated with | |
746 | * every I_T nexus other than the I_T nexus on which the SET | |
747 | * TARGET PORT GROUPS command | |
748 | */ | |
749 | atomic_inc(&mem->tg_pt_gp_mem_ref_cnt); | |
750 | smp_mb__after_atomic_inc(); | |
751 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
752 | ||
753 | spin_lock_bh(&port->sep_alua_lock); | |
754 | list_for_each_entry(se_deve, &port->sep_alua_list, | |
755 | alua_port_list) { | |
756 | lacl = se_deve->se_lun_acl; | |
757 | /* | |
758 | * se_deve->se_lun_acl pointer may be NULL for a | |
759 | * entry created without explict Node+MappedLUN ACLs | |
760 | */ | |
761 | if (!(lacl)) | |
762 | continue; | |
763 | ||
764 | if (explict && | |
765 | (nacl != NULL) && (nacl == lacl->se_lun_nacl) && | |
766 | (l_port != NULL) && (l_port == port)) | |
767 | continue; | |
768 | ||
769 | core_scsi3_ua_allocate(lacl->se_lun_nacl, | |
770 | se_deve->mapped_lun, 0x2A, | |
771 | ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED); | |
772 | } | |
773 | spin_unlock_bh(&port->sep_alua_lock); | |
774 | ||
775 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
776 | atomic_dec(&mem->tg_pt_gp_mem_ref_cnt); | |
777 | smp_mb__after_atomic_dec(); | |
778 | } | |
779 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
780 | /* | |
781 | * Update the ALUA metadata buf that has been allocated in | |
782 | * core_alua_do_port_transition(), this metadata will be written | |
783 | * to struct file. | |
784 | * | |
785 | * Note that there is the case where we do not want to update the | |
786 | * metadata when the saved metadata is being parsed in userspace | |
787 | * when setting the existing port access state and access status. | |
788 | * | |
789 | * Also note that the failure to write out the ALUA metadata to | |
790 | * struct file does NOT affect the actual ALUA transition. | |
791 | */ | |
792 | if (tg_pt_gp->tg_pt_gp_write_metadata) { | |
793 | mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
794 | core_alua_update_tpg_primary_metadata(tg_pt_gp, | |
795 | new_state, md_buf); | |
796 | mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex); | |
797 | } | |
798 | /* | |
799 | * Set the current primary ALUA access state to the requested new state | |
800 | */ | |
801 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state); | |
802 | ||
803 | printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu" | |
804 | " from primary access state %s to %s\n", (explict) ? "explict" : | |
805 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
806 | tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state), | |
807 | core_alua_dump_state(new_state)); | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
812 | int core_alua_do_port_transition( | |
813 | struct t10_alua_tg_pt_gp *l_tg_pt_gp, | |
814 | struct se_device *l_dev, | |
815 | struct se_port *l_port, | |
816 | struct se_node_acl *l_nacl, | |
817 | int new_state, | |
818 | int explict) | |
819 | { | |
820 | struct se_device *dev; | |
821 | struct se_port *port; | |
822 | struct se_subsystem_dev *su_dev; | |
823 | struct se_node_acl *nacl; | |
824 | struct t10_alua_lu_gp *lu_gp; | |
825 | struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem; | |
826 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
827 | unsigned char *md_buf; | |
828 | int primary; | |
829 | ||
830 | if (core_alua_check_transition(new_state, &primary) != 0) | |
831 | return -EINVAL; | |
832 | ||
833 | md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL); | |
834 | if (!(md_buf)) { | |
835 | printk("Unable to allocate buf for ALUA metadata\n"); | |
836 | return -ENOMEM; | |
837 | } | |
838 | ||
839 | local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem; | |
840 | spin_lock(&local_lu_gp_mem->lu_gp_mem_lock); | |
841 | lu_gp = local_lu_gp_mem->lu_gp; | |
842 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
843 | smp_mb__after_atomic_inc(); | |
844 | spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock); | |
845 | /* | |
846 | * For storage objects that are members of the 'default_lu_gp', | |
847 | * we only do transition on the passed *l_tp_pt_gp, and not | |
848 | * on all of the matching target port groups IDs in default_lu_gp. | |
849 | */ | |
850 | if (!(lu_gp->lu_gp_id)) { | |
851 | /* | |
852 | * core_alua_do_transition_tg_pt() will always return | |
853 | * success. | |
854 | */ | |
855 | core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl, | |
856 | md_buf, new_state, explict); | |
857 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
858 | smp_mb__after_atomic_dec(); | |
859 | kfree(md_buf); | |
860 | return 0; | |
861 | } | |
862 | /* | |
863 | * For all other LU groups aside from 'default_lu_gp', walk all of | |
864 | * the associated storage objects looking for a matching target port | |
865 | * group ID from the local target port group. | |
866 | */ | |
867 | spin_lock(&lu_gp->lu_gp_lock); | |
868 | list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list, | |
869 | lu_gp_mem_list) { | |
870 | ||
871 | dev = lu_gp_mem->lu_gp_mem_dev; | |
872 | su_dev = dev->se_sub_dev; | |
873 | atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
874 | smp_mb__after_atomic_inc(); | |
875 | spin_unlock(&lu_gp->lu_gp_lock); | |
876 | ||
e3d6f909 | 877 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 878 | list_for_each_entry(tg_pt_gp, |
e3d6f909 | 879 | &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
880 | tg_pt_gp_list) { |
881 | ||
882 | if (!(tg_pt_gp->tg_pt_gp_valid_id)) | |
883 | continue; | |
884 | /* | |
885 | * If the target behavior port asymmetric access state | |
886 | * is changed for any target port group accessiable via | |
887 | * a logical unit within a LU group, the target port | |
888 | * behavior group asymmetric access states for the same | |
889 | * target port group accessible via other logical units | |
890 | * in that LU group will also change. | |
891 | */ | |
892 | if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id) | |
893 | continue; | |
894 | ||
895 | if (l_tg_pt_gp == tg_pt_gp) { | |
896 | port = l_port; | |
897 | nacl = l_nacl; | |
898 | } else { | |
899 | port = NULL; | |
900 | nacl = NULL; | |
901 | } | |
902 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
903 | smp_mb__after_atomic_inc(); | |
e3d6f909 | 904 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
905 | /* |
906 | * core_alua_do_transition_tg_pt() will always return | |
907 | * success. | |
908 | */ | |
909 | core_alua_do_transition_tg_pt(tg_pt_gp, port, | |
910 | nacl, md_buf, new_state, explict); | |
911 | ||
e3d6f909 | 912 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
913 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
914 | smp_mb__after_atomic_dec(); | |
915 | } | |
e3d6f909 | 916 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
917 | |
918 | spin_lock(&lu_gp->lu_gp_lock); | |
919 | atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt); | |
920 | smp_mb__after_atomic_dec(); | |
921 | } | |
922 | spin_unlock(&lu_gp->lu_gp_lock); | |
923 | ||
924 | printk(KERN_INFO "Successfully processed LU Group: %s all ALUA TG PT" | |
925 | " Group IDs: %hu %s transition to primary state: %s\n", | |
926 | config_item_name(&lu_gp->lu_gp_group.cg_item), | |
927 | l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict", | |
928 | core_alua_dump_state(new_state)); | |
929 | ||
930 | atomic_dec(&lu_gp->lu_gp_ref_cnt); | |
931 | smp_mb__after_atomic_dec(); | |
932 | kfree(md_buf); | |
933 | return 0; | |
934 | } | |
935 | ||
936 | /* | |
937 | * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held | |
938 | */ | |
939 | static int core_alua_update_tpg_secondary_metadata( | |
940 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
941 | struct se_port *port, | |
942 | unsigned char *md_buf, | |
943 | u32 md_buf_len) | |
944 | { | |
945 | struct se_portal_group *se_tpg = port->sep_tpg; | |
946 | char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN]; | |
947 | int len; | |
948 | ||
949 | memset(path, 0, ALUA_METADATA_PATH_LEN); | |
950 | memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN); | |
951 | ||
952 | len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s", | |
e3d6f909 | 953 | se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg)); |
c66ac9db | 954 | |
e3d6f909 | 955 | if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) |
c66ac9db | 956 | snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu", |
e3d6f909 | 957 | se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg)); |
c66ac9db NB |
958 | |
959 | len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n" | |
960 | "alua_tg_pt_status=0x%02x\n", | |
961 | atomic_read(&port->sep_tg_pt_secondary_offline), | |
962 | port->sep_tg_pt_secondary_stat); | |
963 | ||
964 | snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u", | |
e3d6f909 | 965 | se_tpg->se_tpg_tfo->get_fabric_name(), wwn, |
c66ac9db NB |
966 | port->sep_lun->unpacked_lun); |
967 | ||
968 | return core_alua_write_tpg_metadata(path, md_buf, len); | |
969 | } | |
970 | ||
971 | static int core_alua_set_tg_pt_secondary_state( | |
972 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
973 | struct se_port *port, | |
974 | int explict, | |
975 | int offline) | |
976 | { | |
977 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
978 | unsigned char *md_buf; | |
979 | u32 md_buf_len; | |
980 | int trans_delay_msecs; | |
981 | ||
982 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
983 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
984 | if (!(tg_pt_gp)) { | |
985 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
986 | printk(KERN_ERR "Unable to complete secondary state" | |
987 | " transition\n"); | |
e3d6f909 | 988 | return -EINVAL; |
c66ac9db NB |
989 | } |
990 | trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs; | |
991 | /* | |
992 | * Set the secondary ALUA target port access state to OFFLINE | |
993 | * or release the previously secondary state for struct se_port | |
994 | */ | |
995 | if (offline) | |
996 | atomic_set(&port->sep_tg_pt_secondary_offline, 1); | |
997 | else | |
998 | atomic_set(&port->sep_tg_pt_secondary_offline, 0); | |
999 | ||
1000 | md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len; | |
1001 | port->sep_tg_pt_secondary_stat = (explict) ? | |
1002 | ALUA_STATUS_ALTERED_BY_EXPLICT_STPG : | |
1003 | ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA; | |
1004 | ||
1005 | printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s ID: %hu" | |
1006 | " to secondary access state: %s\n", (explict) ? "explict" : | |
1007 | "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item), | |
1008 | tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE"); | |
1009 | ||
1010 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1011 | /* | |
1012 | * Do the optional transition delay after we set the secondary | |
1013 | * ALUA access state. | |
1014 | */ | |
1015 | if (trans_delay_msecs != 0) | |
1016 | msleep_interruptible(trans_delay_msecs); | |
1017 | /* | |
1018 | * See if we need to update the ALUA fabric port metadata for | |
1019 | * secondary state and status | |
1020 | */ | |
1021 | if (port->sep_tg_pt_secondary_write_md) { | |
1022 | md_buf = kzalloc(md_buf_len, GFP_KERNEL); | |
1023 | if (!(md_buf)) { | |
1024 | printk(KERN_ERR "Unable to allocate md_buf for" | |
1025 | " secondary ALUA access metadata\n"); | |
e3d6f909 | 1026 | return -ENOMEM; |
c66ac9db NB |
1027 | } |
1028 | mutex_lock(&port->sep_tg_pt_md_mutex); | |
1029 | core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port, | |
1030 | md_buf, md_buf_len); | |
1031 | mutex_unlock(&port->sep_tg_pt_md_mutex); | |
1032 | ||
1033 | kfree(md_buf); | |
1034 | } | |
1035 | ||
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | struct t10_alua_lu_gp * | |
1040 | core_alua_allocate_lu_gp(const char *name, int def_group) | |
1041 | { | |
1042 | struct t10_alua_lu_gp *lu_gp; | |
1043 | ||
1044 | lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL); | |
1045 | if (!(lu_gp)) { | |
1046 | printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp\n"); | |
6eab04a8 | 1047 | return ERR_PTR(-ENOMEM); |
c66ac9db | 1048 | } |
e3d6f909 | 1049 | INIT_LIST_HEAD(&lu_gp->lu_gp_node); |
c66ac9db NB |
1050 | INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list); |
1051 | spin_lock_init(&lu_gp->lu_gp_lock); | |
1052 | atomic_set(&lu_gp->lu_gp_ref_cnt, 0); | |
1053 | ||
1054 | if (def_group) { | |
e3d6f909 | 1055 | lu_gp->lu_gp_id = alua_lu_gps_counter++; |
c66ac9db | 1056 | lu_gp->lu_gp_valid_id = 1; |
e3d6f909 | 1057 | alua_lu_gps_count++; |
c66ac9db NB |
1058 | } |
1059 | ||
1060 | return lu_gp; | |
1061 | } | |
1062 | ||
1063 | int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id) | |
1064 | { | |
1065 | struct t10_alua_lu_gp *lu_gp_tmp; | |
1066 | u16 lu_gp_id_tmp; | |
1067 | /* | |
1068 | * The lu_gp->lu_gp_id may only be set once.. | |
1069 | */ | |
1070 | if (lu_gp->lu_gp_valid_id) { | |
1071 | printk(KERN_WARNING "ALUA LU Group already has a valid ID," | |
1072 | " ignoring request\n"); | |
e3d6f909 | 1073 | return -EINVAL; |
c66ac9db NB |
1074 | } |
1075 | ||
e3d6f909 AG |
1076 | spin_lock(&lu_gps_lock); |
1077 | if (alua_lu_gps_count == 0x0000ffff) { | |
1078 | printk(KERN_ERR "Maximum ALUA alua_lu_gps_count:" | |
c66ac9db | 1079 | " 0x0000ffff reached\n"); |
e3d6f909 | 1080 | spin_unlock(&lu_gps_lock); |
c66ac9db | 1081 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); |
e3d6f909 | 1082 | return -ENOSPC; |
c66ac9db NB |
1083 | } |
1084 | again: | |
1085 | lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id : | |
e3d6f909 | 1086 | alua_lu_gps_counter++; |
c66ac9db | 1087 | |
e3d6f909 | 1088 | list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) { |
c66ac9db NB |
1089 | if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) { |
1090 | if (!(lu_gp_id)) | |
1091 | goto again; | |
1092 | ||
1093 | printk(KERN_WARNING "ALUA Logical Unit Group ID: %hu" | |
1094 | " already exists, ignoring request\n", | |
1095 | lu_gp_id); | |
e3d6f909 AG |
1096 | spin_unlock(&lu_gps_lock); |
1097 | return -EINVAL; | |
c66ac9db NB |
1098 | } |
1099 | } | |
1100 | ||
1101 | lu_gp->lu_gp_id = lu_gp_id_tmp; | |
1102 | lu_gp->lu_gp_valid_id = 1; | |
e3d6f909 AG |
1103 | list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list); |
1104 | alua_lu_gps_count++; | |
1105 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1106 | |
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | static struct t10_alua_lu_gp_member * | |
1111 | core_alua_allocate_lu_gp_mem(struct se_device *dev) | |
1112 | { | |
1113 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1114 | ||
1115 | lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL); | |
1116 | if (!(lu_gp_mem)) { | |
1117 | printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp_member\n"); | |
1118 | return ERR_PTR(-ENOMEM); | |
1119 | } | |
1120 | INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list); | |
1121 | spin_lock_init(&lu_gp_mem->lu_gp_mem_lock); | |
1122 | atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0); | |
1123 | ||
1124 | lu_gp_mem->lu_gp_mem_dev = dev; | |
1125 | dev->dev_alua_lu_gp_mem = lu_gp_mem; | |
1126 | ||
1127 | return lu_gp_mem; | |
1128 | } | |
1129 | ||
1130 | void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp) | |
1131 | { | |
1132 | struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp; | |
1133 | /* | |
1134 | * Once we have reached this point, config_item_put() has | |
1135 | * already been called from target_core_alua_drop_lu_gp(). | |
1136 | * | |
1137 | * Here, we remove the *lu_gp from the global list so that | |
1138 | * no associations can be made while we are releasing | |
1139 | * struct t10_alua_lu_gp. | |
1140 | */ | |
e3d6f909 | 1141 | spin_lock(&lu_gps_lock); |
c66ac9db | 1142 | atomic_set(&lu_gp->lu_gp_shutdown, 1); |
e3d6f909 AG |
1143 | list_del(&lu_gp->lu_gp_node); |
1144 | alua_lu_gps_count--; | |
1145 | spin_unlock(&lu_gps_lock); | |
c66ac9db NB |
1146 | /* |
1147 | * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name() | |
1148 | * in target_core_configfs.c:target_core_store_alua_lu_gp() to be | |
1149 | * released with core_alua_put_lu_gp_from_name() | |
1150 | */ | |
1151 | while (atomic_read(&lu_gp->lu_gp_ref_cnt)) | |
1152 | cpu_relax(); | |
1153 | /* | |
1154 | * Release reference to struct t10_alua_lu_gp * from all associated | |
1155 | * struct se_device. | |
1156 | */ | |
1157 | spin_lock(&lu_gp->lu_gp_lock); | |
1158 | list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp, | |
1159 | &lu_gp->lu_gp_mem_list, lu_gp_mem_list) { | |
1160 | if (lu_gp_mem->lu_gp_assoc) { | |
1161 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1162 | lu_gp->lu_gp_members--; | |
1163 | lu_gp_mem->lu_gp_assoc = 0; | |
1164 | } | |
1165 | spin_unlock(&lu_gp->lu_gp_lock); | |
1166 | /* | |
1167 | * | |
25985edc | 1168 | * lu_gp_mem is associated with a single |
c66ac9db NB |
1169 | * struct se_device->dev_alua_lu_gp_mem, and is released when |
1170 | * struct se_device is released via core_alua_free_lu_gp_mem(). | |
1171 | * | |
1172 | * If the passed lu_gp does NOT match the default_lu_gp, assume | |
1173 | * we want to re-assocate a given lu_gp_mem with default_lu_gp. | |
1174 | */ | |
1175 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
e3d6f909 | 1176 | if (lu_gp != default_lu_gp) |
c66ac9db | 1177 | __core_alua_attach_lu_gp_mem(lu_gp_mem, |
e3d6f909 | 1178 | default_lu_gp); |
c66ac9db NB |
1179 | else |
1180 | lu_gp_mem->lu_gp = NULL; | |
1181 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1182 | ||
1183 | spin_lock(&lu_gp->lu_gp_lock); | |
1184 | } | |
1185 | spin_unlock(&lu_gp->lu_gp_lock); | |
1186 | ||
1187 | kmem_cache_free(t10_alua_lu_gp_cache, lu_gp); | |
1188 | } | |
1189 | ||
1190 | void core_alua_free_lu_gp_mem(struct se_device *dev) | |
1191 | { | |
1192 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1193 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1194 | struct t10_alua_lu_gp *lu_gp; |
1195 | struct t10_alua_lu_gp_member *lu_gp_mem; | |
1196 | ||
1197 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1198 | return; | |
1199 | ||
1200 | lu_gp_mem = dev->dev_alua_lu_gp_mem; | |
1201 | if (!(lu_gp_mem)) | |
1202 | return; | |
1203 | ||
1204 | while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt)) | |
1205 | cpu_relax(); | |
1206 | ||
1207 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1208 | lu_gp = lu_gp_mem->lu_gp; | |
1209 | if ((lu_gp)) { | |
1210 | spin_lock(&lu_gp->lu_gp_lock); | |
1211 | if (lu_gp_mem->lu_gp_assoc) { | |
1212 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1213 | lu_gp->lu_gp_members--; | |
1214 | lu_gp_mem->lu_gp_assoc = 0; | |
1215 | } | |
1216 | spin_unlock(&lu_gp->lu_gp_lock); | |
1217 | lu_gp_mem->lu_gp = NULL; | |
1218 | } | |
1219 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); | |
1220 | ||
1221 | kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem); | |
1222 | } | |
1223 | ||
1224 | struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name) | |
1225 | { | |
1226 | struct t10_alua_lu_gp *lu_gp; | |
1227 | struct config_item *ci; | |
1228 | ||
e3d6f909 AG |
1229 | spin_lock(&lu_gps_lock); |
1230 | list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) { | |
c66ac9db NB |
1231 | if (!(lu_gp->lu_gp_valid_id)) |
1232 | continue; | |
1233 | ci = &lu_gp->lu_gp_group.cg_item; | |
1234 | if (!(strcmp(config_item_name(ci), name))) { | |
1235 | atomic_inc(&lu_gp->lu_gp_ref_cnt); | |
e3d6f909 | 1236 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1237 | return lu_gp; |
1238 | } | |
1239 | } | |
e3d6f909 | 1240 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1241 | |
1242 | return NULL; | |
1243 | } | |
1244 | ||
1245 | void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp) | |
1246 | { | |
e3d6f909 | 1247 | spin_lock(&lu_gps_lock); |
c66ac9db | 1248 | atomic_dec(&lu_gp->lu_gp_ref_cnt); |
e3d6f909 | 1249 | spin_unlock(&lu_gps_lock); |
c66ac9db NB |
1250 | } |
1251 | ||
1252 | /* | |
1253 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1254 | */ | |
1255 | void __core_alua_attach_lu_gp_mem( | |
1256 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1257 | struct t10_alua_lu_gp *lu_gp) | |
1258 | { | |
1259 | spin_lock(&lu_gp->lu_gp_lock); | |
1260 | lu_gp_mem->lu_gp = lu_gp; | |
1261 | lu_gp_mem->lu_gp_assoc = 1; | |
1262 | list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list); | |
1263 | lu_gp->lu_gp_members++; | |
1264 | spin_unlock(&lu_gp->lu_gp_lock); | |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock | |
1269 | */ | |
1270 | void __core_alua_drop_lu_gp_mem( | |
1271 | struct t10_alua_lu_gp_member *lu_gp_mem, | |
1272 | struct t10_alua_lu_gp *lu_gp) | |
1273 | { | |
1274 | spin_lock(&lu_gp->lu_gp_lock); | |
1275 | list_del(&lu_gp_mem->lu_gp_mem_list); | |
1276 | lu_gp_mem->lu_gp = NULL; | |
1277 | lu_gp_mem->lu_gp_assoc = 0; | |
1278 | lu_gp->lu_gp_members--; | |
1279 | spin_unlock(&lu_gp->lu_gp_lock); | |
1280 | } | |
1281 | ||
1282 | struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp( | |
1283 | struct se_subsystem_dev *su_dev, | |
1284 | const char *name, | |
1285 | int def_group) | |
1286 | { | |
1287 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1288 | ||
1289 | tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL); | |
1290 | if (!(tg_pt_gp)) { | |
1291 | printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp\n"); | |
1292 | return NULL; | |
1293 | } | |
1294 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list); | |
1295 | INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list); | |
1296 | mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex); | |
1297 | spin_lock_init(&tg_pt_gp->tg_pt_gp_lock); | |
1298 | atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0); | |
1299 | tg_pt_gp->tg_pt_gp_su_dev = su_dev; | |
1300 | tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN; | |
1301 | atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, | |
1302 | ALUA_ACCESS_STATE_ACTIVE_OPTMIZED); | |
1303 | /* | |
1304 | * Enable both explict and implict ALUA support by default | |
1305 | */ | |
1306 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1307 | TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA; | |
1308 | /* | |
1309 | * Set the default Active/NonOptimized Delay in milliseconds | |
1310 | */ | |
1311 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS; | |
1312 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS; | |
1313 | ||
1314 | if (def_group) { | |
e3d6f909 | 1315 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1316 | tg_pt_gp->tg_pt_gp_id = |
e3d6f909 | 1317 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1318 | tg_pt_gp->tg_pt_gp_valid_id = 1; |
e3d6f909 | 1319 | su_dev->t10_alua.alua_tg_pt_gps_count++; |
c66ac9db | 1320 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, |
e3d6f909 AG |
1321 | &su_dev->t10_alua.tg_pt_gps_list); |
1322 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1323 | } |
1324 | ||
1325 | return tg_pt_gp; | |
1326 | } | |
1327 | ||
1328 | int core_alua_set_tg_pt_gp_id( | |
1329 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1330 | u16 tg_pt_gp_id) | |
1331 | { | |
1332 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1333 | struct t10_alua_tg_pt_gp *tg_pt_gp_tmp; | |
1334 | u16 tg_pt_gp_id_tmp; | |
1335 | /* | |
1336 | * The tg_pt_gp->tg_pt_gp_id may only be set once.. | |
1337 | */ | |
1338 | if (tg_pt_gp->tg_pt_gp_valid_id) { | |
1339 | printk(KERN_WARNING "ALUA TG PT Group already has a valid ID," | |
1340 | " ignoring request\n"); | |
e3d6f909 | 1341 | return -EINVAL; |
c66ac9db NB |
1342 | } |
1343 | ||
e3d6f909 AG |
1344 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1345 | if (su_dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) { | |
c66ac9db NB |
1346 | printk(KERN_ERR "Maximum ALUA alua_tg_pt_gps_count:" |
1347 | " 0x0000ffff reached\n"); | |
e3d6f909 | 1348 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1349 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); |
e3d6f909 | 1350 | return -ENOSPC; |
c66ac9db NB |
1351 | } |
1352 | again: | |
1353 | tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id : | |
e3d6f909 | 1354 | su_dev->t10_alua.alua_tg_pt_gps_counter++; |
c66ac9db | 1355 | |
e3d6f909 | 1356 | list_for_each_entry(tg_pt_gp_tmp, &su_dev->t10_alua.tg_pt_gps_list, |
c66ac9db NB |
1357 | tg_pt_gp_list) { |
1358 | if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) { | |
1359 | if (!(tg_pt_gp_id)) | |
1360 | goto again; | |
1361 | ||
1362 | printk(KERN_ERR "ALUA Target Port Group ID: %hu already" | |
1363 | " exists, ignoring request\n", tg_pt_gp_id); | |
e3d6f909 AG |
1364 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
1365 | return -EINVAL; | |
c66ac9db NB |
1366 | } |
1367 | } | |
1368 | ||
1369 | tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp; | |
1370 | tg_pt_gp->tg_pt_gp_valid_id = 1; | |
1371 | list_add_tail(&tg_pt_gp->tg_pt_gp_list, | |
e3d6f909 AG |
1372 | &su_dev->t10_alua.tg_pt_gps_list); |
1373 | su_dev->t10_alua.alua_tg_pt_gps_count++; | |
1374 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1375 | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem( | |
1380 | struct se_port *port) | |
1381 | { | |
1382 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1383 | ||
1384 | tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache, | |
1385 | GFP_KERNEL); | |
1386 | if (!(tg_pt_gp_mem)) { | |
1387 | printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp_member\n"); | |
1388 | return ERR_PTR(-ENOMEM); | |
1389 | } | |
1390 | INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1391 | spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1392 | atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0); | |
1393 | ||
1394 | tg_pt_gp_mem->tg_pt = port; | |
1395 | port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem; | |
1396 | atomic_set(&port->sep_tg_pt_gp_active, 1); | |
1397 | ||
1398 | return tg_pt_gp_mem; | |
1399 | } | |
1400 | ||
1401 | void core_alua_free_tg_pt_gp( | |
1402 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1403 | { | |
1404 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1405 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp; | |
1406 | /* | |
1407 | * Once we have reached this point, config_item_put() has already | |
1408 | * been called from target_core_alua_drop_tg_pt_gp(). | |
1409 | * | |
1410 | * Here we remove *tg_pt_gp from the global list so that | |
1411 | * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS | |
1412 | * can be made while we are releasing struct t10_alua_tg_pt_gp. | |
1413 | */ | |
e3d6f909 | 1414 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1415 | list_del(&tg_pt_gp->tg_pt_gp_list); |
e3d6f909 AG |
1416 | su_dev->t10_alua.alua_tg_pt_gps_counter--; |
1417 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); | |
c66ac9db NB |
1418 | /* |
1419 | * Allow a struct t10_alua_tg_pt_gp_member * referenced by | |
1420 | * core_alua_get_tg_pt_gp_by_name() in | |
1421 | * target_core_configfs.c:target_core_store_alua_tg_pt_gp() | |
1422 | * to be released with core_alua_put_tg_pt_gp_from_name(). | |
1423 | */ | |
1424 | while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt)) | |
1425 | cpu_relax(); | |
1426 | /* | |
1427 | * Release reference to struct t10_alua_tg_pt_gp from all associated | |
1428 | * struct se_port. | |
1429 | */ | |
1430 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1431 | list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp, | |
1432 | &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) { | |
1433 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1434 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1435 | tg_pt_gp->tg_pt_gp_members--; | |
1436 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1437 | } | |
1438 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1439 | /* | |
25985edc | 1440 | * tg_pt_gp_mem is associated with a single |
c66ac9db NB |
1441 | * se_port->sep_alua_tg_pt_gp_mem, and is released via |
1442 | * core_alua_free_tg_pt_gp_mem(). | |
1443 | * | |
1444 | * If the passed tg_pt_gp does NOT match the default_tg_pt_gp, | |
1445 | * assume we want to re-assocate a given tg_pt_gp_mem with | |
1446 | * default_tg_pt_gp. | |
1447 | */ | |
1448 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
e3d6f909 | 1449 | if (tg_pt_gp != su_dev->t10_alua.default_tg_pt_gp) { |
c66ac9db | 1450 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, |
e3d6f909 | 1451 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1452 | } else |
1453 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1454 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1455 | ||
1456 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1457 | } | |
1458 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1459 | ||
1460 | kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp); | |
1461 | } | |
1462 | ||
1463 | void core_alua_free_tg_pt_gp_mem(struct se_port *port) | |
1464 | { | |
1465 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
e3d6f909 | 1466 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1467 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1468 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1469 | ||
1470 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1471 | return; | |
1472 | ||
1473 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
1474 | if (!(tg_pt_gp_mem)) | |
1475 | return; | |
1476 | ||
1477 | while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt)) | |
1478 | cpu_relax(); | |
1479 | ||
1480 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1481 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
1482 | if ((tg_pt_gp)) { | |
1483 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1484 | if (tg_pt_gp_mem->tg_pt_gp_assoc) { | |
1485 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1486 | tg_pt_gp->tg_pt_gp_members--; | |
1487 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1488 | } | |
1489 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1490 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1491 | } | |
1492 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1493 | ||
1494 | kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem); | |
1495 | } | |
1496 | ||
1497 | static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name( | |
1498 | struct se_subsystem_dev *su_dev, | |
1499 | const char *name) | |
1500 | { | |
1501 | struct t10_alua_tg_pt_gp *tg_pt_gp; | |
1502 | struct config_item *ci; | |
1503 | ||
e3d6f909 AG |
1504 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
1505 | list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list, | |
c66ac9db NB |
1506 | tg_pt_gp_list) { |
1507 | if (!(tg_pt_gp->tg_pt_gp_valid_id)) | |
1508 | continue; | |
1509 | ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
1510 | if (!(strcmp(config_item_name(ci), name))) { | |
1511 | atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt); | |
e3d6f909 | 1512 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1513 | return tg_pt_gp; |
1514 | } | |
1515 | } | |
e3d6f909 | 1516 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1517 | |
1518 | return NULL; | |
1519 | } | |
1520 | ||
1521 | static void core_alua_put_tg_pt_gp_from_name( | |
1522 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1523 | { | |
1524 | struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev; | |
1525 | ||
e3d6f909 | 1526 | spin_lock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db | 1527 | atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt); |
e3d6f909 | 1528 | spin_unlock(&su_dev->t10_alua.tg_pt_gps_lock); |
c66ac9db NB |
1529 | } |
1530 | ||
1531 | /* | |
1532 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1533 | */ | |
1534 | void __core_alua_attach_tg_pt_gp_mem( | |
1535 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1536 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1537 | { | |
1538 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1539 | tg_pt_gp_mem->tg_pt_gp = tg_pt_gp; | |
1540 | tg_pt_gp_mem->tg_pt_gp_assoc = 1; | |
1541 | list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list, | |
1542 | &tg_pt_gp->tg_pt_gp_mem_list); | |
1543 | tg_pt_gp->tg_pt_gp_members++; | |
1544 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held | |
1549 | */ | |
1550 | static void __core_alua_drop_tg_pt_gp_mem( | |
1551 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, | |
1552 | struct t10_alua_tg_pt_gp *tg_pt_gp) | |
1553 | { | |
1554 | spin_lock(&tg_pt_gp->tg_pt_gp_lock); | |
1555 | list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list); | |
1556 | tg_pt_gp_mem->tg_pt_gp = NULL; | |
1557 | tg_pt_gp_mem->tg_pt_gp_assoc = 0; | |
1558 | tg_pt_gp->tg_pt_gp_members--; | |
1559 | spin_unlock(&tg_pt_gp->tg_pt_gp_lock); | |
1560 | } | |
1561 | ||
1562 | ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page) | |
1563 | { | |
1564 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1565 | struct config_item *tg_pt_ci; | |
e3d6f909 | 1566 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1567 | struct t10_alua_tg_pt_gp *tg_pt_gp; |
1568 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1569 | ssize_t len = 0; | |
1570 | ||
1571 | if (alua->alua_type != SPC3_ALUA_EMULATED) | |
1572 | return len; | |
1573 | ||
1574 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
1575 | if (!(tg_pt_gp_mem)) | |
1576 | return len; | |
1577 | ||
1578 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1579 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
1580 | if ((tg_pt_gp)) { | |
1581 | tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item; | |
1582 | len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:" | |
1583 | " %hu\nTG Port Primary Access State: %s\nTG Port " | |
1584 | "Primary Access Status: %s\nTG Port Secondary Access" | |
1585 | " State: %s\nTG Port Secondary Access Status: %s\n", | |
1586 | config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id, | |
1587 | core_alua_dump_state(atomic_read( | |
1588 | &tg_pt_gp->tg_pt_gp_alua_access_state)), | |
1589 | core_alua_dump_status( | |
1590 | tg_pt_gp->tg_pt_gp_alua_access_status), | |
1591 | (atomic_read(&port->sep_tg_pt_secondary_offline)) ? | |
1592 | "Offline" : "None", | |
1593 | core_alua_dump_status(port->sep_tg_pt_secondary_stat)); | |
1594 | } | |
1595 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1596 | ||
1597 | return len; | |
1598 | } | |
1599 | ||
1600 | ssize_t core_alua_store_tg_pt_gp_info( | |
1601 | struct se_port *port, | |
1602 | const char *page, | |
1603 | size_t count) | |
1604 | { | |
1605 | struct se_portal_group *tpg; | |
1606 | struct se_lun *lun; | |
1607 | struct se_subsystem_dev *su_dev = port->sep_lun->lun_se_dev->se_sub_dev; | |
1608 | struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL; | |
1609 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1610 | unsigned char buf[TG_PT_GROUP_NAME_BUF]; | |
1611 | int move = 0; | |
1612 | ||
1613 | tpg = port->sep_tpg; | |
1614 | lun = port->sep_lun; | |
1615 | ||
e3d6f909 | 1616 | if (su_dev->t10_alua.alua_type != SPC3_ALUA_EMULATED) { |
c66ac9db | 1617 | printk(KERN_WARNING "SPC3_ALUA_EMULATED not enabled for" |
e3d6f909 AG |
1618 | " %s/tpgt_%hu/%s\n", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1619 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1620 | config_item_name(&lun->lun_group.cg_item)); |
1621 | return -EINVAL; | |
1622 | } | |
1623 | ||
1624 | if (count > TG_PT_GROUP_NAME_BUF) { | |
1625 | printk(KERN_ERR "ALUA Target Port Group alias too large!\n"); | |
1626 | return -EINVAL; | |
1627 | } | |
1628 | memset(buf, 0, TG_PT_GROUP_NAME_BUF); | |
1629 | memcpy(buf, page, count); | |
1630 | /* | |
1631 | * Any ALUA target port group alias besides "NULL" means we will be | |
1632 | * making a new group association. | |
1633 | */ | |
1634 | if (strcmp(strstrip(buf), "NULL")) { | |
1635 | /* | |
1636 | * core_alua_get_tg_pt_gp_by_name() will increment reference to | |
1637 | * struct t10_alua_tg_pt_gp. This reference is released with | |
1638 | * core_alua_put_tg_pt_gp_from_name() below. | |
1639 | */ | |
1640 | tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev, | |
1641 | strstrip(buf)); | |
1642 | if (!(tg_pt_gp_new)) | |
1643 | return -ENODEV; | |
1644 | } | |
1645 | tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; | |
1646 | if (!(tg_pt_gp_mem)) { | |
1647 | if (tg_pt_gp_new) | |
1648 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1649 | printk(KERN_ERR "NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n"); | |
1650 | return -EINVAL; | |
1651 | } | |
1652 | ||
1653 | spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1654 | tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; | |
1655 | if ((tg_pt_gp)) { | |
1656 | /* | |
1657 | * Clearing an existing tg_pt_gp association, and replacing | |
1658 | * with the default_tg_pt_gp. | |
1659 | */ | |
1660 | if (!(tg_pt_gp_new)) { | |
1661 | printk(KERN_INFO "Target_Core_ConfigFS: Moving" | |
1662 | " %s/tpgt_%hu/%s from ALUA Target Port Group:" | |
1663 | " alua/%s, ID: %hu back to" | |
1664 | " default_tg_pt_gp\n", | |
e3d6f909 AG |
1665 | tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1666 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1667 | config_item_name(&lun->lun_group.cg_item), |
1668 | config_item_name( | |
1669 | &tg_pt_gp->tg_pt_gp_group.cg_item), | |
1670 | tg_pt_gp->tg_pt_gp_id); | |
1671 | ||
1672 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1673 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, | |
e3d6f909 | 1674 | su_dev->t10_alua.default_tg_pt_gp); |
c66ac9db NB |
1675 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); |
1676 | ||
1677 | return count; | |
1678 | } | |
1679 | /* | |
1680 | * Removing existing association of tg_pt_gp_mem with tg_pt_gp | |
1681 | */ | |
1682 | __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp); | |
1683 | move = 1; | |
1684 | } | |
1685 | /* | |
1686 | * Associate tg_pt_gp_mem with tg_pt_gp_new. | |
1687 | */ | |
1688 | __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new); | |
1689 | spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); | |
1690 | printk(KERN_INFO "Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA" | |
1691 | " Target Port Group: alua/%s, ID: %hu\n", (move) ? | |
e3d6f909 AG |
1692 | "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg), |
1693 | tpg->se_tpg_tfo->tpg_get_tag(tpg), | |
c66ac9db NB |
1694 | config_item_name(&lun->lun_group.cg_item), |
1695 | config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item), | |
1696 | tg_pt_gp_new->tg_pt_gp_id); | |
1697 | ||
1698 | core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new); | |
1699 | return count; | |
1700 | } | |
1701 | ||
1702 | ssize_t core_alua_show_access_type( | |
1703 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1704 | char *page) | |
1705 | { | |
1706 | if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) && | |
1707 | (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)) | |
1708 | return sprintf(page, "Implict and Explict\n"); | |
1709 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA) | |
1710 | return sprintf(page, "Implict\n"); | |
1711 | else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) | |
1712 | return sprintf(page, "Explict\n"); | |
1713 | else | |
1714 | return sprintf(page, "None\n"); | |
1715 | } | |
1716 | ||
1717 | ssize_t core_alua_store_access_type( | |
1718 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1719 | const char *page, | |
1720 | size_t count) | |
1721 | { | |
1722 | unsigned long tmp; | |
1723 | int ret; | |
1724 | ||
1725 | ret = strict_strtoul(page, 0, &tmp); | |
1726 | if (ret < 0) { | |
1727 | printk(KERN_ERR "Unable to extract alua_access_type\n"); | |
1728 | return -EINVAL; | |
1729 | } | |
1730 | if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) { | |
1731 | printk(KERN_ERR "Illegal value for alua_access_type:" | |
1732 | " %lu\n", tmp); | |
1733 | return -EINVAL; | |
1734 | } | |
1735 | if (tmp == 3) | |
1736 | tg_pt_gp->tg_pt_gp_alua_access_type = | |
1737 | TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA; | |
1738 | else if (tmp == 2) | |
1739 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA; | |
1740 | else if (tmp == 1) | |
1741 | tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA; | |
1742 | else | |
1743 | tg_pt_gp->tg_pt_gp_alua_access_type = 0; | |
1744 | ||
1745 | return count; | |
1746 | } | |
1747 | ||
1748 | ssize_t core_alua_show_nonop_delay_msecs( | |
1749 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1750 | char *page) | |
1751 | { | |
1752 | return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs); | |
1753 | } | |
1754 | ||
1755 | ssize_t core_alua_store_nonop_delay_msecs( | |
1756 | struct t10_alua_tg_pt_gp *tg_pt_gp, | |
1757 | const char *page, | |
1758 | size_t count) | |
1759 | { | |
1760 | unsigned long tmp; | |
1761 | int ret; | |
1762 | ||
1763 | ret = strict_strtoul(page, 0, &tmp); | |
1764 | if (ret < 0) { | |
1765 | printk(KERN_ERR "Unable to extract nonop_delay_msecs\n"); | |
1766 | return -EINVAL; | |
1767 | } | |
1768 | if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) { | |
1769 | printk(KERN_ERR "Passed nonop_delay_msecs: %lu, exceeds" | |
1770 | " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp, | |
1771 | ALUA_MAX_NONOP_DELAY_MSECS); | |
1772 | return -EINVAL; | |
1773 | } | |
1774 | tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp; | |
1775 | ||
1776 | return count; | |
1777 | } | |
1778 | ||
1779 | ssize_t core_alua_show_trans_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_trans_delay_msecs); | |
1784 | } | |
1785 | ||
1786 | ssize_t core_alua_store_trans_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) { | |
1796 | printk(KERN_ERR "Unable to extract trans_delay_msecs\n"); | |
1797 | return -EINVAL; | |
1798 | } | |
1799 | if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) { | |
1800 | printk(KERN_ERR "Passed trans_delay_msecs: %lu, exceeds" | |
1801 | " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp, | |
1802 | ALUA_MAX_TRANS_DELAY_MSECS); | |
1803 | return -EINVAL; | |
1804 | } | |
1805 | tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp; | |
1806 | ||
1807 | return count; | |
1808 | } | |
1809 | ||
1810 | ssize_t core_alua_show_preferred_bit( | |
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_pref); | |
1815 | } | |
1816 | ||
1817 | ssize_t core_alua_store_preferred_bit( | |
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) { | |
1827 | printk(KERN_ERR "Unable to extract preferred ALUA value\n"); | |
1828 | return -EINVAL; | |
1829 | } | |
1830 | if ((tmp != 0) && (tmp != 1)) { | |
1831 | printk(KERN_ERR "Illegal value for preferred ALUA: %lu\n", tmp); | |
1832 | return -EINVAL; | |
1833 | } | |
1834 | tg_pt_gp->tg_pt_gp_pref = (int)tmp; | |
1835 | ||
1836 | return count; | |
1837 | } | |
1838 | ||
1839 | ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page) | |
1840 | { | |
1841 | if (!(lun->lun_sep)) | |
1842 | return -ENODEV; | |
1843 | ||
1844 | return sprintf(page, "%d\n", | |
1845 | atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline)); | |
1846 | } | |
1847 | ||
1848 | ssize_t core_alua_store_offline_bit( | |
1849 | struct se_lun *lun, | |
1850 | const char *page, | |
1851 | size_t count) | |
1852 | { | |
1853 | struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; | |
1854 | unsigned long tmp; | |
1855 | int ret; | |
1856 | ||
1857 | if (!(lun->lun_sep)) | |
1858 | return -ENODEV; | |
1859 | ||
1860 | ret = strict_strtoul(page, 0, &tmp); | |
1861 | if (ret < 0) { | |
1862 | printk(KERN_ERR "Unable to extract alua_tg_pt_offline value\n"); | |
1863 | return -EINVAL; | |
1864 | } | |
1865 | if ((tmp != 0) && (tmp != 1)) { | |
1866 | printk(KERN_ERR "Illegal value for alua_tg_pt_offline: %lu\n", | |
1867 | tmp); | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem; | |
1871 | if (!(tg_pt_gp_mem)) { | |
1872 | printk(KERN_ERR "Unable to locate *tg_pt_gp_mem\n"); | |
1873 | return -EINVAL; | |
1874 | } | |
1875 | ||
1876 | ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem, | |
1877 | lun->lun_sep, 0, (int)tmp); | |
1878 | if (ret < 0) | |
1879 | return -EINVAL; | |
1880 | ||
1881 | return count; | |
1882 | } | |
1883 | ||
1884 | ssize_t core_alua_show_secondary_status( | |
1885 | struct se_lun *lun, | |
1886 | char *page) | |
1887 | { | |
1888 | return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat); | |
1889 | } | |
1890 | ||
1891 | ssize_t core_alua_store_secondary_status( | |
1892 | struct se_lun *lun, | |
1893 | const char *page, | |
1894 | size_t count) | |
1895 | { | |
1896 | unsigned long tmp; | |
1897 | int ret; | |
1898 | ||
1899 | ret = strict_strtoul(page, 0, &tmp); | |
1900 | if (ret < 0) { | |
1901 | printk(KERN_ERR "Unable to extract alua_tg_pt_status\n"); | |
1902 | return -EINVAL; | |
1903 | } | |
1904 | if ((tmp != ALUA_STATUS_NONE) && | |
1905 | (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) && | |
1906 | (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) { | |
1907 | printk(KERN_ERR "Illegal value for alua_tg_pt_status: %lu\n", | |
1908 | tmp); | |
1909 | return -EINVAL; | |
1910 | } | |
1911 | lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp; | |
1912 | ||
1913 | return count; | |
1914 | } | |
1915 | ||
1916 | ssize_t core_alua_show_secondary_write_metadata( | |
1917 | struct se_lun *lun, | |
1918 | char *page) | |
1919 | { | |
1920 | return sprintf(page, "%d\n", | |
1921 | lun->lun_sep->sep_tg_pt_secondary_write_md); | |
1922 | } | |
1923 | ||
1924 | ssize_t core_alua_store_secondary_write_metadata( | |
1925 | struct se_lun *lun, | |
1926 | const char *page, | |
1927 | size_t count) | |
1928 | { | |
1929 | unsigned long tmp; | |
1930 | int ret; | |
1931 | ||
1932 | ret = strict_strtoul(page, 0, &tmp); | |
1933 | if (ret < 0) { | |
1934 | printk(KERN_ERR "Unable to extract alua_tg_pt_write_md\n"); | |
1935 | return -EINVAL; | |
1936 | } | |
1937 | if ((tmp != 0) && (tmp != 1)) { | |
1938 | printk(KERN_ERR "Illegal value for alua_tg_pt_write_md:" | |
1939 | " %lu\n", tmp); | |
1940 | return -EINVAL; | |
1941 | } | |
1942 | lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp; | |
1943 | ||
1944 | return count; | |
1945 | } | |
1946 | ||
1947 | int core_setup_alua(struct se_device *dev, int force_pt) | |
1948 | { | |
1949 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; | |
e3d6f909 | 1950 | struct t10_alua *alua = &su_dev->t10_alua; |
c66ac9db NB |
1951 | struct t10_alua_lu_gp_member *lu_gp_mem; |
1952 | /* | |
1953 | * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic | |
1954 | * of the Underlying SCSI hardware. In Linux/SCSI terms, this can | |
1955 | * cause a problem because libata and some SATA RAID HBAs appear | |
1956 | * under Linux/SCSI, but emulate SCSI logic themselves. | |
1957 | */ | |
e3d6f909 AG |
1958 | if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) && |
1959 | !(dev->se_sub_dev->se_dev_attrib.emulate_alua)) || force_pt) { | |
c66ac9db NB |
1960 | alua->alua_type = SPC_ALUA_PASSTHROUGH; |
1961 | alua->alua_state_check = &core_alua_state_check_nop; | |
1962 | printk(KERN_INFO "%s: Using SPC_ALUA_PASSTHROUGH, no ALUA" | |
e3d6f909 | 1963 | " emulation\n", dev->transport->name); |
c66ac9db NB |
1964 | return 0; |
1965 | } | |
1966 | /* | |
1967 | * If SPC-3 or above is reported by real or emulated struct se_device, | |
1968 | * use emulated ALUA. | |
1969 | */ | |
e3d6f909 | 1970 | if (dev->transport->get_device_rev(dev) >= SCSI_3) { |
c66ac9db | 1971 | printk(KERN_INFO "%s: Enabling ALUA Emulation for SPC-3" |
e3d6f909 | 1972 | " device\n", dev->transport->name); |
c66ac9db | 1973 | /* |
25985edc | 1974 | * Associate this struct se_device with the default ALUA |
c66ac9db NB |
1975 | * LUN Group. |
1976 | */ | |
1977 | lu_gp_mem = core_alua_allocate_lu_gp_mem(dev); | |
e3d6f909 AG |
1978 | if (IS_ERR(lu_gp_mem)) |
1979 | return PTR_ERR(lu_gp_mem); | |
c66ac9db NB |
1980 | |
1981 | alua->alua_type = SPC3_ALUA_EMULATED; | |
1982 | alua->alua_state_check = &core_alua_state_check; | |
1983 | spin_lock(&lu_gp_mem->lu_gp_mem_lock); | |
1984 | __core_alua_attach_lu_gp_mem(lu_gp_mem, | |
e3d6f909 | 1985 | default_lu_gp); |
c66ac9db NB |
1986 | spin_unlock(&lu_gp_mem->lu_gp_mem_lock); |
1987 | ||
1988 | printk(KERN_INFO "%s: Adding to default ALUA LU Group:" | |
1989 | " core/alua/lu_gps/default_lu_gp\n", | |
e3d6f909 | 1990 | dev->transport->name); |
c66ac9db NB |
1991 | } else { |
1992 | alua->alua_type = SPC2_ALUA_DISABLED; | |
1993 | alua->alua_state_check = &core_alua_state_check_nop; | |
1994 | printk(KERN_INFO "%s: Disabling ALUA Emulation for SPC-2" | |
e3d6f909 | 1995 | " device\n", dev->transport->name); |
c66ac9db NB |
1996 | } |
1997 | ||
1998 | return 0; | |
1999 | } |