source: src/linux/universal/linux-4.9/drivers/target/target_core_device.c @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 2 weeks ago

use new squashfs in all kernels

File size: 29.3 KB
Line 
1/*******************************************************************************
2 * Filename:  target_core_device.c (based on iscsi_target_device.c)
3 *
4 * This file contains the TCM Virtual Device and Disk Transport
5 * agnostic related functions.
6 *
7 * (c) Copyright 2003-2013 Datera, Inc.
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/net.h>
28#include <linux/string.h>
29#include <linux/delay.h>
30#include <linux/timer.h>
31#include <linux/slab.h>
32#include <linux/spinlock.h>
33#include <linux/kthread.h>
34#include <linux/in.h>
35#include <linux/export.h>
36#include <asm/unaligned.h>
37#include <net/sock.h>
38#include <net/tcp.h>
39#include <scsi/scsi_common.h>
40#include <scsi/scsi_proto.h>
41
42#include <target/target_core_base.h>
43#include <target/target_core_backend.h>
44#include <target/target_core_fabric.h>
45
46#include "target_core_internal.h"
47#include "target_core_alua.h"
48#include "target_core_pr.h"
49#include "target_core_ua.h"
50
51DEFINE_MUTEX(g_device_mutex);
52LIST_HEAD(g_device_list);
53
54static struct se_hba *lun0_hba;
55/* not static, needed by tpg.c */
56struct se_device *g_lun0_dev;
57
58sense_reason_t
59transport_lookup_cmd_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
60{
61        struct se_lun *se_lun = NULL;
62        struct se_session *se_sess = se_cmd->se_sess;
63        struct se_node_acl *nacl = se_sess->se_node_acl;
64        struct se_dev_entry *deve;
65        sense_reason_t ret = TCM_NO_SENSE;
66
67        rcu_read_lock();
68        deve = target_nacl_find_deve(nacl, unpacked_lun);
69        if (deve) {
70                atomic_long_inc(&deve->total_cmds);
71
72                if (se_cmd->data_direction == DMA_TO_DEVICE)
73                        atomic_long_add(se_cmd->data_length,
74                                        &deve->write_bytes);
75                else if (se_cmd->data_direction == DMA_FROM_DEVICE)
76                        atomic_long_add(se_cmd->data_length,
77                                        &deve->read_bytes);
78
79                se_lun = rcu_dereference(deve->se_lun);
80
81                if (!percpu_ref_tryget_live(&se_lun->lun_ref)) {
82                        se_lun = NULL;
83                        goto out_unlock;
84                }
85
86                se_cmd->se_lun = rcu_dereference(deve->se_lun);
87                se_cmd->pr_res_key = deve->pr_res_key;
88                se_cmd->orig_fe_lun = unpacked_lun;
89                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
90                se_cmd->lun_ref_active = true;
91
92                if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
93                    deve->lun_access_ro) {
94                        pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
95                                " Access for 0x%08llx\n",
96                                se_cmd->se_tfo->get_fabric_name(),
97                                unpacked_lun);
98                        rcu_read_unlock();
99                        ret = TCM_WRITE_PROTECTED;
100                        goto ref_dev;
101                }
102        }
103out_unlock:
104        rcu_read_unlock();
105
106        if (!se_lun) {
107                /*
108                 * Use the se_portal_group->tpg_virt_lun0 to allow for
109                 * REPORT_LUNS, et al to be returned when no active
110                 * MappedLUN=0 exists for this Initiator Port.
111                 */
112                if (unpacked_lun != 0) {
113                        pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
114                                " Access for 0x%08llx\n",
115                                se_cmd->se_tfo->get_fabric_name(),
116                                unpacked_lun);
117                        return TCM_NON_EXISTENT_LUN;
118                }
119
120                se_lun = se_sess->se_tpg->tpg_virt_lun0;
121                se_cmd->se_lun = se_sess->se_tpg->tpg_virt_lun0;
122                se_cmd->orig_fe_lun = 0;
123                se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
124
125                percpu_ref_get(&se_lun->lun_ref);
126                se_cmd->lun_ref_active = true;
127
128                /*
129                 * Force WRITE PROTECT for virtual LUN 0
130                 */
131                if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
132                    (se_cmd->data_direction != DMA_NONE)) {
133                        ret = TCM_WRITE_PROTECTED;
134                        goto ref_dev;
135                }
136        }
137        /*
138         * RCU reference protected by percpu se_lun->lun_ref taken above that
139         * must drop to zero (including initial reference) before this se_lun
140         * pointer can be kfree_rcu() by the final se_lun->lun_group put via
141         * target_core_fabric_configfs.c:target_fabric_port_release
142         */
143ref_dev:
144        se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
145        atomic_long_inc(&se_cmd->se_dev->num_cmds);
146
147        if (se_cmd->data_direction == DMA_TO_DEVICE)
148                atomic_long_add(se_cmd->data_length,
149                                &se_cmd->se_dev->write_bytes);
150        else if (se_cmd->data_direction == DMA_FROM_DEVICE)
151                atomic_long_add(se_cmd->data_length,
152                                &se_cmd->se_dev->read_bytes);
153
154        return ret;
155}
156EXPORT_SYMBOL(transport_lookup_cmd_lun);
157
158int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u64 unpacked_lun)
159{
160        struct se_dev_entry *deve;
161        struct se_lun *se_lun = NULL;
162        struct se_session *se_sess = se_cmd->se_sess;
163        struct se_node_acl *nacl = se_sess->se_node_acl;
164        struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
165        unsigned long flags;
166
167        rcu_read_lock();
168        deve = target_nacl_find_deve(nacl, unpacked_lun);
169        if (deve) {
170                se_tmr->tmr_lun = rcu_dereference(deve->se_lun);
171                se_cmd->se_lun = rcu_dereference(deve->se_lun);
172                se_lun = rcu_dereference(deve->se_lun);
173                se_cmd->pr_res_key = deve->pr_res_key;
174                se_cmd->orig_fe_lun = unpacked_lun;
175        }
176        rcu_read_unlock();
177
178        if (!se_lun) {
179                pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
180                        " Access for 0x%08llx\n",
181                        se_cmd->se_tfo->get_fabric_name(),
182                        unpacked_lun);
183                return -ENODEV;
184        }
185        /*
186         * XXX: Add percpu se_lun->lun_ref reference count for TMR
187         */
188        se_cmd->se_dev = rcu_dereference_raw(se_lun->lun_se_dev);
189        se_tmr->tmr_dev = rcu_dereference_raw(se_lun->lun_se_dev);
190
191        spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
192        list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
193        spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
194
195        return 0;
196}
197EXPORT_SYMBOL(transport_lookup_tmr_lun);
198
199bool target_lun_is_rdonly(struct se_cmd *cmd)
200{
201        struct se_session *se_sess = cmd->se_sess;
202        struct se_dev_entry *deve;
203        bool ret;
204
205        rcu_read_lock();
206        deve = target_nacl_find_deve(se_sess->se_node_acl, cmd->orig_fe_lun);
207        ret = deve && deve->lun_access_ro;
208        rcu_read_unlock();
209
210        return ret;
211}
212EXPORT_SYMBOL(target_lun_is_rdonly);
213
214/*
215 * This function is called from core_scsi3_emulate_pro_register_and_move()
216 * and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_kref
217 * when a matching rtpi is found.
218 */
219struct se_dev_entry *core_get_se_deve_from_rtpi(
220        struct se_node_acl *nacl,
221        u16 rtpi)
222{
223        struct se_dev_entry *deve;
224        struct se_lun *lun;
225        struct se_portal_group *tpg = nacl->se_tpg;
226
227        rcu_read_lock();
228        hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
229                lun = rcu_dereference(deve->se_lun);
230                if (!lun) {
231                        pr_err("%s device entries device pointer is"
232                                " NULL, but Initiator has access.\n",
233                                tpg->se_tpg_tfo->get_fabric_name());
234                        continue;
235                }
236                if (lun->lun_rtpi != rtpi)
237                        continue;
238
239                kref_get(&deve->pr_kref);
240                rcu_read_unlock();
241
242                return deve;
243        }
244        rcu_read_unlock();
245
246        return NULL;
247}
248
249void core_free_device_list_for_node(
250        struct se_node_acl *nacl,
251        struct se_portal_group *tpg)
252{
253        struct se_dev_entry *deve;
254
255        mutex_lock(&nacl->lun_entry_mutex);
256        hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
257                struct se_lun *lun = rcu_dereference_check(deve->se_lun,
258                                        lockdep_is_held(&nacl->lun_entry_mutex));
259                core_disable_device_list_for_node(lun, deve, nacl, tpg);
260        }
261        mutex_unlock(&nacl->lun_entry_mutex);
262}
263
264void core_update_device_list_access(
265        u64 mapped_lun,
266        bool lun_access_ro,
267        struct se_node_acl *nacl)
268{
269        struct se_dev_entry *deve;
270
271        mutex_lock(&nacl->lun_entry_mutex);
272        deve = target_nacl_find_deve(nacl, mapped_lun);
273        if (deve)
274                deve->lun_access_ro = lun_access_ro;
275        mutex_unlock(&nacl->lun_entry_mutex);
276}
277
278/*
279 * Called with rcu_read_lock or nacl->device_list_lock held.
280 */
281struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
282{
283        struct se_dev_entry *deve;
284
285        hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
286                if (deve->mapped_lun == mapped_lun)
287                        return deve;
288
289        return NULL;
290}
291EXPORT_SYMBOL(target_nacl_find_deve);
292
293void target_pr_kref_release(struct kref *kref)
294{
295        struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
296                                                 pr_kref);
297        complete(&deve->pr_comp);
298}
299
300static void
301target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
302                             bool skip_new)
303{
304        struct se_dev_entry *tmp;
305
306        rcu_read_lock();
307        hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
308                if (skip_new && tmp == new)
309                        continue;
310                core_scsi3_ua_allocate(tmp, 0x3F,
311                                       ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
312        }
313        rcu_read_unlock();
314}
315
316int core_enable_device_list_for_node(
317        struct se_lun *lun,
318        struct se_lun_acl *lun_acl,
319        u64 mapped_lun,
320        bool lun_access_ro,
321        struct se_node_acl *nacl,
322        struct se_portal_group *tpg)
323{
324        struct se_dev_entry *orig, *new;
325
326        new = kzalloc(sizeof(*new), GFP_KERNEL);
327        if (!new) {
328                pr_err("Unable to allocate se_dev_entry memory\n");
329                return -ENOMEM;
330        }
331
332        atomic_set(&new->ua_count, 0);
333        spin_lock_init(&new->ua_lock);
334        INIT_LIST_HEAD(&new->ua_list);
335        INIT_LIST_HEAD(&new->lun_link);
336
337        new->mapped_lun = mapped_lun;
338        kref_init(&new->pr_kref);
339        init_completion(&new->pr_comp);
340
341        new->lun_access_ro = lun_access_ro;
342        new->creation_time = get_jiffies_64();
343        new->attach_count++;
344
345        mutex_lock(&nacl->lun_entry_mutex);
346        orig = target_nacl_find_deve(nacl, mapped_lun);
347        if (orig && orig->se_lun) {
348                struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
349                                        lockdep_is_held(&nacl->lun_entry_mutex));
350
351                if (orig_lun != lun) {
352                        pr_err("Existing orig->se_lun doesn't match new lun"
353                               " for dynamic -> explicit NodeACL conversion:"
354                                " %s\n", nacl->initiatorname);
355                        mutex_unlock(&nacl->lun_entry_mutex);
356                        kfree(new);
357                        return -EINVAL;
358                }
359                if (orig->se_lun_acl != NULL) {
360                        pr_warn_ratelimited("Detected existing explicit"
361                                " se_lun_acl->se_lun_group reference for %s"
362                                " mapped_lun: %llu, failing\n",
363                                 nacl->initiatorname, mapped_lun);
364                        mutex_unlock(&nacl->lun_entry_mutex);
365                        kfree(new);
366                        return -EINVAL;
367                }
368
369                rcu_assign_pointer(new->se_lun, lun);
370                rcu_assign_pointer(new->se_lun_acl, lun_acl);
371                hlist_del_rcu(&orig->link);
372                hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
373                mutex_unlock(&nacl->lun_entry_mutex);
374
375                spin_lock(&lun->lun_deve_lock);
376                list_del(&orig->lun_link);
377                list_add_tail(&new->lun_link, &lun->lun_deve_list);
378                spin_unlock(&lun->lun_deve_lock);
379
380                kref_put(&orig->pr_kref, target_pr_kref_release);
381                wait_for_completion(&orig->pr_comp);
382
383                target_luns_data_has_changed(nacl, new, true);
384                kfree_rcu(orig, rcu_head);
385                return 0;
386        }
387
388        rcu_assign_pointer(new->se_lun, lun);
389        rcu_assign_pointer(new->se_lun_acl, lun_acl);
390        hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
391        mutex_unlock(&nacl->lun_entry_mutex);
392
393        spin_lock(&lun->lun_deve_lock);
394        list_add_tail(&new->lun_link, &lun->lun_deve_list);
395        spin_unlock(&lun->lun_deve_lock);
396
397        target_luns_data_has_changed(nacl, new, true);
398        return 0;
399}
400
401/*
402 *      Called with se_node_acl->lun_entry_mutex held.
403 */
404void core_disable_device_list_for_node(
405        struct se_lun *lun,
406        struct se_dev_entry *orig,
407        struct se_node_acl *nacl,
408        struct se_portal_group *tpg)
409{
410        /*
411         * rcu_dereference_raw protected by se_lun->lun_group symlink
412         * reference to se_device->dev_group.
413         */
414        struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
415        /*
416         * If the MappedLUN entry is being disabled, the entry in
417         * lun->lun_deve_list must be removed now before clearing the
418         * struct se_dev_entry pointers below as logic in
419         * core_alua_do_transition_tg_pt() depends on these being present.
420         *
421         * deve->se_lun_acl will be NULL for demo-mode created LUNs
422         * that have not been explicitly converted to MappedLUNs ->
423         * struct se_lun_acl, but we remove deve->lun_link from
424         * lun->lun_deve_list. This also means that active UAs and
425         * NodeACL context specific PR metadata for demo-mode
426         * MappedLUN *deve will be released below..
427         */
428        spin_lock(&lun->lun_deve_lock);
429        list_del(&orig->lun_link);
430        spin_unlock(&lun->lun_deve_lock);
431        /*
432         * Disable struct se_dev_entry LUN ACL mapping
433         */
434        core_scsi3_ua_release_all(orig);
435
436        hlist_del_rcu(&orig->link);
437        clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
438        orig->lun_access_ro = false;
439        orig->creation_time = 0;
440        orig->attach_count--;
441        /*
442         * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
443         * or REGISTER_AND_MOVE PR operation to complete.
444         */
445        kref_put(&orig->pr_kref, target_pr_kref_release);
446        wait_for_completion(&orig->pr_comp);
447
448        rcu_assign_pointer(orig->se_lun, NULL);
449        rcu_assign_pointer(orig->se_lun_acl, NULL);
450
451        kfree_rcu(orig, rcu_head);
452
453        core_scsi3_free_pr_reg_from_nacl(dev, nacl);
454        target_luns_data_has_changed(nacl, NULL, false);
455}
456
457/*      core_clear_lun_from_tpg():
458 *
459 *
460 */
461void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
462{
463        struct se_node_acl *nacl;
464        struct se_dev_entry *deve;
465
466        mutex_lock(&tpg->acl_node_mutex);
467        list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
468
469                mutex_lock(&nacl->lun_entry_mutex);
470                hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
471                        struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
472                                        lockdep_is_held(&nacl->lun_entry_mutex));
473
474                        if (lun != tmp_lun)
475                                continue;
476
477                        core_disable_device_list_for_node(lun, deve, nacl, tpg);
478                }
479                mutex_unlock(&nacl->lun_entry_mutex);
480        }
481        mutex_unlock(&tpg->acl_node_mutex);
482}
483
484int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
485{
486        struct se_lun *tmp;
487
488        spin_lock(&dev->se_port_lock);
489        if (dev->export_count == 0x0000ffff) {
490                pr_warn("Reached dev->dev_port_count =="
491                                " 0x0000ffff\n");
492                spin_unlock(&dev->se_port_lock);
493                return -ENOSPC;
494        }
495again:
496        /*
497         * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
498         * Here is the table from spc4r17 section 7.7.3.8.
499         *
500         *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
501         *
502         * Code      Description
503         * 0h        Reserved
504         * 1h        Relative port 1, historically known as port A
505         * 2h        Relative port 2, historically known as port B
506         * 3h to FFFFh    Relative port 3 through 65 535
507         */
508        lun->lun_rtpi = dev->dev_rpti_counter++;
509        if (!lun->lun_rtpi)
510                goto again;
511
512        list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
513                /*
514                 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
515                 * for 16-bit wrap..
516                 */
517                if (lun->lun_rtpi == tmp->lun_rtpi)
518                        goto again;
519        }
520        spin_unlock(&dev->se_port_lock);
521
522        return 0;
523}
524
525static void se_release_vpd_for_dev(struct se_device *dev)
526{
527        struct t10_vpd *vpd, *vpd_tmp;
528
529        spin_lock(&dev->t10_wwn.t10_vpd_lock);
530        list_for_each_entry_safe(vpd, vpd_tmp,
531                        &dev->t10_wwn.t10_vpd_list, vpd_list) {
532                list_del(&vpd->vpd_list);
533                kfree(vpd);
534        }
535        spin_unlock(&dev->t10_wwn.t10_vpd_lock);
536}
537
538static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
539{
540        u32 aligned_max_sectors;
541        u32 alignment;
542        /*
543         * Limit max_sectors to a PAGE_SIZE aligned value for modern
544         * transport_allocate_data_tasks() operation.
545         */
546        alignment = max(1ul, PAGE_SIZE / block_size);
547        aligned_max_sectors = rounddown(max_sectors, alignment);
548
549        if (max_sectors != aligned_max_sectors)
550                pr_info("Rounding down aligned max_sectors from %u to %u\n",
551                        max_sectors, aligned_max_sectors);
552
553        return aligned_max_sectors;
554}
555
556int core_dev_add_lun(
557        struct se_portal_group *tpg,
558        struct se_device *dev,
559        struct se_lun *lun)
560{
561        int rc;
562
563        rc = core_tpg_add_lun(tpg, lun, false, dev);
564        if (rc < 0)
565                return rc;
566
567        pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
568                " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
569                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
570                tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
571        /*
572         * Update LUN maps for dynamically added initiators when
573         * generate_node_acl is enabled.
574         */
575        if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
576                struct se_node_acl *acl;
577
578                mutex_lock(&tpg->acl_node_mutex);
579                list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
580                        if (acl->dynamic_node_acl &&
581                            (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
582                             !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
583                                core_tpg_add_node_to_devs(acl, tpg, lun);
584                        }
585                }
586                mutex_unlock(&tpg->acl_node_mutex);
587        }
588
589        return 0;
590}
591
592/*      core_dev_del_lun():
593 *
594 *
595 */
596void core_dev_del_lun(
597        struct se_portal_group *tpg,
598        struct se_lun *lun)
599{
600        pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
601                " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
602                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
603                tpg->se_tpg_tfo->get_fabric_name());
604
605        core_tpg_remove_lun(tpg, lun);
606}
607
608struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
609        struct se_portal_group *tpg,
610        struct se_node_acl *nacl,
611        u64 mapped_lun,
612        int *ret)
613{
614        struct se_lun_acl *lacl;
615
616        if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
617                pr_err("%s InitiatorName exceeds maximum size.\n",
618                        tpg->se_tpg_tfo->get_fabric_name());
619                *ret = -EOVERFLOW;
620                return NULL;
621        }
622        lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
623        if (!lacl) {
624                pr_err("Unable to allocate memory for struct se_lun_acl.\n");
625                *ret = -ENOMEM;
626                return NULL;
627        }
628
629        lacl->mapped_lun = mapped_lun;
630        lacl->se_lun_nacl = nacl;
631
632        return lacl;
633}
634
635int core_dev_add_initiator_node_lun_acl(
636        struct se_portal_group *tpg,
637        struct se_lun_acl *lacl,
638        struct se_lun *lun,
639        bool lun_access_ro)
640{
641        struct se_node_acl *nacl = lacl->se_lun_nacl;
642        /*
643         * rcu_dereference_raw protected by se_lun->lun_group symlink
644         * reference to se_device->dev_group.
645         */
646        struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
647
648        if (!nacl)
649                return -EINVAL;
650
651        if (lun->lun_access_ro)
652                lun_access_ro = true;
653
654        lacl->se_lun = lun;
655
656        if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
657                        lun_access_ro, nacl, tpg) < 0)
658                return -EINVAL;
659
660        pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
661                " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
662                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
663                lun_access_ro ? "RO" : "RW",
664                nacl->initiatorname);
665        /*
666         * Check to see if there are any existing persistent reservation APTPL
667         * pre-registrations that need to be enabled for this LUN ACL..
668         */
669        core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
670                                            lacl->mapped_lun);
671        return 0;
672}
673
674int core_dev_del_initiator_node_lun_acl(
675        struct se_lun *lun,
676        struct se_lun_acl *lacl)
677{
678        struct se_portal_group *tpg = lun->lun_tpg;
679        struct se_node_acl *nacl;
680        struct se_dev_entry *deve;
681
682        nacl = lacl->se_lun_nacl;
683        if (!nacl)
684                return -EINVAL;
685
686        mutex_lock(&nacl->lun_entry_mutex);
687        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
688        if (deve)
689                core_disable_device_list_for_node(lun, deve, nacl, tpg);
690        mutex_unlock(&nacl->lun_entry_mutex);
691
692        pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
693                " InitiatorNode: %s Mapped LUN: %llu\n",
694                tpg->se_tpg_tfo->get_fabric_name(),
695                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
696                nacl->initiatorname, lacl->mapped_lun);
697
698        return 0;
699}
700
701void core_dev_free_initiator_node_lun_acl(
702        struct se_portal_group *tpg,
703        struct se_lun_acl *lacl)
704{
705        pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
706                " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
707                tpg->se_tpg_tfo->tpg_get_tag(tpg),
708                tpg->se_tpg_tfo->get_fabric_name(),
709                lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
710
711        kfree(lacl);
712}
713
714static void scsi_dump_inquiry(struct se_device *dev)
715{
716        struct t10_wwn *wwn = &dev->t10_wwn;
717        char buf[17];
718        int i, device_type;
719        /*
720         * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
721         */
722        for (i = 0; i < 8; i++)
723                if (wwn->vendor[i] >= 0x20)
724                        buf[i] = wwn->vendor[i];
725                else
726                        buf[i] = ' ';
727        buf[i] = '\0';
728        pr_debug("  Vendor: %s\n", buf);
729
730        for (i = 0; i < 16; i++)
731                if (wwn->model[i] >= 0x20)
732                        buf[i] = wwn->model[i];
733                else
734                        buf[i] = ' ';
735        buf[i] = '\0';
736        pr_debug("  Model: %s\n", buf);
737
738        for (i = 0; i < 4; i++)
739                if (wwn->revision[i] >= 0x20)
740                        buf[i] = wwn->revision[i];
741                else
742                        buf[i] = ' ';
743        buf[i] = '\0';
744        pr_debug("  Revision: %s\n", buf);
745
746        device_type = dev->transport->get_device_type(dev);
747        pr_debug("  Type:   %s ", scsi_device_type(device_type));
748}
749
750struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
751{
752        struct se_device *dev;
753        struct se_lun *xcopy_lun;
754
755        dev = hba->backend->ops->alloc_device(hba, name);
756        if (!dev)
757                return NULL;
758
759        dev->dev_link_magic = SE_DEV_LINK_MAGIC;
760        dev->se_hba = hba;
761        dev->transport = hba->backend->ops;
762        dev->prot_length = sizeof(struct t10_pi_tuple);
763        dev->hba_index = hba->hba_index;
764
765        INIT_LIST_HEAD(&dev->dev_list);
766        INIT_LIST_HEAD(&dev->dev_sep_list);
767        INIT_LIST_HEAD(&dev->dev_tmr_list);
768        INIT_LIST_HEAD(&dev->delayed_cmd_list);
769        INIT_LIST_HEAD(&dev->state_list);
770        INIT_LIST_HEAD(&dev->qf_cmd_list);
771        INIT_LIST_HEAD(&dev->g_dev_node);
772        spin_lock_init(&dev->execute_task_lock);
773        spin_lock_init(&dev->delayed_cmd_lock);
774        spin_lock_init(&dev->dev_reservation_lock);
775        spin_lock_init(&dev->se_port_lock);
776        spin_lock_init(&dev->se_tmr_lock);
777        spin_lock_init(&dev->qf_cmd_lock);
778        sema_init(&dev->caw_sem, 1);
779        INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
780        spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
781        INIT_LIST_HEAD(&dev->t10_pr.registration_list);
782        INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
783        spin_lock_init(&dev->t10_pr.registration_lock);
784        spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
785        INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
786        spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
787        INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
788        spin_lock_init(&dev->t10_alua.lba_map_lock);
789
790        dev->t10_wwn.t10_dev = dev;
791        dev->t10_alua.t10_dev = dev;
792
793        dev->dev_attrib.da_dev = dev;
794        dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
795        dev->dev_attrib.emulate_dpo = 1;
796        dev->dev_attrib.emulate_fua_write = 1;
797        dev->dev_attrib.emulate_fua_read = 1;
798        dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
799        dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
800        dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
801        dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
802        dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
803        dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
804        dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
805        dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
806        dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
807        dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
808        dev->dev_attrib.is_nonrot = DA_IS_NONROT;
809        dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
810        dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
811        dev->dev_attrib.max_unmap_block_desc_count =
812                DA_MAX_UNMAP_BLOCK_DESC_COUNT;
813        dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
814        dev->dev_attrib.unmap_granularity_alignment =
815                                DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
816        dev->dev_attrib.unmap_zeroes_data =
817                                DA_UNMAP_ZEROES_DATA_DEFAULT;
818        dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
819
820        xcopy_lun = &dev->xcopy_lun;
821        rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
822        init_completion(&xcopy_lun->lun_ref_comp);
823        init_completion(&xcopy_lun->lun_shutdown_comp);
824        INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
825        INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
826        mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
827        xcopy_lun->lun_tpg = &xcopy_pt_tpg;
828
829        return dev;
830}
831
832/*
833 * Check if the underlying struct block_device request_queue supports
834 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
835 * in ATA and we need to set TPE=1
836 */
837bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
838                                       struct request_queue *q)
839{
840        int block_size = queue_logical_block_size(q);
841
842        if (!blk_queue_discard(q))
843                return false;
844
845        attrib->max_unmap_lba_count =
846                q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
847        /*
848         * Currently hardcoded to 1 in Linux/SCSI code..
849         */
850        attrib->max_unmap_block_desc_count = 1;
851        attrib->unmap_granularity = q->limits.discard_granularity / block_size;
852        attrib->unmap_granularity_alignment = q->limits.discard_alignment /
853                                                                block_size;
854        attrib->unmap_zeroes_data = q->limits.discard_zeroes_data;
855        return true;
856}
857EXPORT_SYMBOL(target_configure_unmap_from_queue);
858
859/*
860 * Convert from blocksize advertised to the initiator to the 512 byte
861 * units unconditionally used by the Linux block layer.
862 */
863sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
864{
865        switch (dev->dev_attrib.block_size) {
866        case 4096:
867                return lb << 3;
868        case 2048:
869                return lb << 2;
870        case 1024:
871                return lb << 1;
872        default:
873                return lb;
874        }
875}
876EXPORT_SYMBOL(target_to_linux_sector);
877
878int target_configure_device(struct se_device *dev)
879{
880        struct se_hba *hba = dev->se_hba;
881        int ret;
882
883        if (dev->dev_flags & DF_CONFIGURED) {
884                pr_err("se_dev->se_dev_ptr already set for storage"
885                                " object\n");
886                return -EEXIST;
887        }
888
889        ret = dev->transport->configure_device(dev);
890        if (ret)
891                goto out;
892        /*
893         * XXX: there is not much point to have two different values here..
894         */
895        dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
896        dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
897
898        /*
899         * Align max_hw_sectors down to PAGE_SIZE I/O transfers
900         */
901        dev->dev_attrib.hw_max_sectors =
902                se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
903                                         dev->dev_attrib.hw_block_size);
904        dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
905
906        dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
907        dev->creation_time = get_jiffies_64();
908
909        ret = core_setup_alua(dev);
910        if (ret)
911                goto out;
912
913        /*
914         * Startup the struct se_device processing thread
915         */
916        dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
917                                      dev->transport->name);
918        if (!dev->tmr_wq) {
919                pr_err("Unable to create tmr workqueue for %s\n",
920                        dev->transport->name);
921                ret = -ENOMEM;
922                goto out_free_alua;
923        }
924
925        /*
926         * Setup work_queue for QUEUE_FULL
927         */
928        INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
929
930        /*
931         * Preload the initial INQUIRY const values if we are doing
932         * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
933         * passthrough because this is being provided by the backend LLD.
934         */
935        if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
936                strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
937                strncpy(&dev->t10_wwn.model[0],
938                        dev->transport->inquiry_prod, 16);
939                strncpy(&dev->t10_wwn.revision[0],
940                        dev->transport->inquiry_rev, 4);
941        }
942
943        scsi_dump_inquiry(dev);
944
945        spin_lock(&hba->device_lock);
946        hba->dev_count++;
947        spin_unlock(&hba->device_lock);
948
949        mutex_lock(&g_device_mutex);
950        list_add_tail(&dev->g_dev_node, &g_device_list);
951        mutex_unlock(&g_device_mutex);
952
953        dev->dev_flags |= DF_CONFIGURED;
954
955        return 0;
956
957out_free_alua:
958        core_alua_free_lu_gp_mem(dev);
959out:
960        se_release_vpd_for_dev(dev);
961        return ret;
962}
963
964void target_free_device(struct se_device *dev)
965{
966        struct se_hba *hba = dev->se_hba;
967
968        WARN_ON(!list_empty(&dev->dev_sep_list));
969
970        if (dev->dev_flags & DF_CONFIGURED) {
971                destroy_workqueue(dev->tmr_wq);
972
973                mutex_lock(&g_device_mutex);
974                list_del(&dev->g_dev_node);
975                mutex_unlock(&g_device_mutex);
976
977                spin_lock(&hba->device_lock);
978                hba->dev_count--;
979                spin_unlock(&hba->device_lock);
980        }
981
982        core_alua_free_lu_gp_mem(dev);
983        core_alua_set_lba_map(dev, NULL, 0, 0);
984        core_scsi3_free_all_registrations(dev);
985        se_release_vpd_for_dev(dev);
986
987        if (dev->transport->free_prot)
988                dev->transport->free_prot(dev);
989
990        dev->transport->free_device(dev);
991}
992
993int core_dev_setup_virtual_lun0(void)
994{
995        struct se_hba *hba;
996        struct se_device *dev;
997        char buf[] = "rd_pages=8,rd_nullio=1";
998        int ret;
999
1000        hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1001        if (IS_ERR(hba))
1002                return PTR_ERR(hba);
1003
1004        dev = target_alloc_device(hba, "virt_lun0");
1005        if (!dev) {
1006                ret = -ENOMEM;
1007                goto out_free_hba;
1008        }
1009
1010        hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1011
1012        ret = target_configure_device(dev);
1013        if (ret)
1014                goto out_free_se_dev;
1015
1016        lun0_hba = hba;
1017        g_lun0_dev = dev;
1018        return 0;
1019
1020out_free_se_dev:
1021        target_free_device(dev);
1022out_free_hba:
1023        core_delete_hba(hba);
1024        return ret;
1025}
1026
1027
1028void core_dev_release_virtual_lun0(void)
1029{
1030        struct se_hba *hba = lun0_hba;
1031
1032        if (!hba)
1033                return;
1034
1035        if (g_lun0_dev)
1036                target_free_device(g_lun0_dev);
1037        core_delete_hba(hba);
1038}
1039
1040/*
1041 * Common CDB parsing for kernel and user passthrough.
1042 */
1043sense_reason_t
1044passthrough_parse_cdb(struct se_cmd *cmd,
1045        sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1046{
1047        unsigned char *cdb = cmd->t_task_cdb;
1048
1049        /*
1050         * Clear a lun set in the cdb if the initiator talking to use spoke
1051         * and old standards version, as we can't assume the underlying device
1052         * won't choke up on it.
1053         */
1054        switch (cdb[0]) {
1055        case READ_10: /* SBC - RDProtect */
1056        case READ_12: /* SBC - RDProtect */
1057        case READ_16: /* SBC - RDProtect */
1058        case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1059        case VERIFY: /* SBC - VRProtect */
1060        case VERIFY_16: /* SBC - VRProtect */
1061        case WRITE_VERIFY: /* SBC - VRProtect */
1062        case WRITE_VERIFY_12: /* SBC - VRProtect */
1063        case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1064                break;
1065        default:
1066                cdb[1] &= 0x1f; /* clear logical unit number */
1067                break;
1068        }
1069
1070        /*
1071         * For REPORT LUNS we always need to emulate the response, for everything
1072         * else, pass it up.
1073         */
1074        if (cdb[0] == REPORT_LUNS) {
1075                cmd->execute_cmd = spc_emulate_report_luns;
1076                return TCM_NO_SENSE;
1077        }
1078
1079        /* Set DATA_CDB flag for ops that should have it */
1080        switch (cdb[0]) {
1081        case READ_6:
1082        case READ_10:
1083        case READ_12:
1084        case READ_16:
1085        case WRITE_6:
1086        case WRITE_10:
1087        case WRITE_12:
1088        case WRITE_16:
1089        case WRITE_VERIFY:
1090        case WRITE_VERIFY_12:
1091        case 0x8e: /* WRITE_VERIFY_16 */
1092        case COMPARE_AND_WRITE:
1093        case XDWRITEREAD_10:
1094                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1095                break;
1096        case VARIABLE_LENGTH_CMD:
1097                switch (get_unaligned_be16(&cdb[8])) {
1098                case READ_32:
1099                case WRITE_32:
1100                case 0x0c: /* WRITE_VERIFY_32 */
1101                case XDWRITEREAD_32:
1102                        cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1103                        break;
1104                }
1105        }
1106
1107        cmd->execute_cmd = exec_cmd;
1108
1109        return TCM_NO_SENSE;
1110}
1111EXPORT_SYMBOL(passthrough_parse_cdb);
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