source: src/linux/universal/linux-4.4/drivers/target/target_core_device.c @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 4 months ago

use new squashfs in all kernels

File size: 29.8 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_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
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_flags & TRANSPORT_LUNFLAGS_READ_ONLY);
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        u32 lun_access,
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                if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
275                        deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
276                        deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
277                } else {
278                        deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
279                        deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
280                }
281        }
282        mutex_unlock(&nacl->lun_entry_mutex);
283}
284
285/*
286 * Called with rcu_read_lock or nacl->device_list_lock held.
287 */
288struct se_dev_entry *target_nacl_find_deve(struct se_node_acl *nacl, u64 mapped_lun)
289{
290        struct se_dev_entry *deve;
291
292        hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
293                if (deve->mapped_lun == mapped_lun)
294                        return deve;
295
296        return NULL;
297}
298EXPORT_SYMBOL(target_nacl_find_deve);
299
300void target_pr_kref_release(struct kref *kref)
301{
302        struct se_dev_entry *deve = container_of(kref, struct se_dev_entry,
303                                                 pr_kref);
304        complete(&deve->pr_comp);
305}
306
307static void
308target_luns_data_has_changed(struct se_node_acl *nacl, struct se_dev_entry *new,
309                             bool skip_new)
310{
311        struct se_dev_entry *tmp;
312
313        rcu_read_lock();
314        hlist_for_each_entry_rcu(tmp, &nacl->lun_entry_hlist, link) {
315                if (skip_new && tmp == new)
316                        continue;
317                core_scsi3_ua_allocate(tmp, 0x3F,
318                                       ASCQ_3FH_REPORTED_LUNS_DATA_HAS_CHANGED);
319        }
320        rcu_read_unlock();
321}
322
323int core_enable_device_list_for_node(
324        struct se_lun *lun,
325        struct se_lun_acl *lun_acl,
326        u64 mapped_lun,
327        u32 lun_access,
328        struct se_node_acl *nacl,
329        struct se_portal_group *tpg)
330{
331        struct se_dev_entry *orig, *new;
332
333        new = kzalloc(sizeof(*new), GFP_KERNEL);
334        if (!new) {
335                pr_err("Unable to allocate se_dev_entry memory\n");
336                return -ENOMEM;
337        }
338
339        atomic_set(&new->ua_count, 0);
340        spin_lock_init(&new->ua_lock);
341        INIT_LIST_HEAD(&new->ua_list);
342        INIT_LIST_HEAD(&new->lun_link);
343
344        new->mapped_lun = mapped_lun;
345        kref_init(&new->pr_kref);
346        init_completion(&new->pr_comp);
347
348        if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE)
349                new->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
350        else
351                new->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
352
353        new->creation_time = get_jiffies_64();
354        new->attach_count++;
355
356        mutex_lock(&nacl->lun_entry_mutex);
357        orig = target_nacl_find_deve(nacl, mapped_lun);
358        if (orig && orig->se_lun) {
359                struct se_lun *orig_lun = rcu_dereference_check(orig->se_lun,
360                                        lockdep_is_held(&nacl->lun_entry_mutex));
361
362                if (orig_lun != lun) {
363                        pr_err("Existing orig->se_lun doesn't match new lun"
364                               " for dynamic -> explicit NodeACL conversion:"
365                                " %s\n", nacl->initiatorname);
366                        mutex_unlock(&nacl->lun_entry_mutex);
367                        kfree(new);
368                        return -EINVAL;
369                }
370                if (orig->se_lun_acl != NULL) {
371                        pr_warn_ratelimited("Detected existing explicit"
372                                " se_lun_acl->se_lun_group reference for %s"
373                                " mapped_lun: %llu, failing\n",
374                                 nacl->initiatorname, mapped_lun);
375                        mutex_unlock(&nacl->lun_entry_mutex);
376                        kfree(new);
377                        return -EINVAL;
378                }
379
380                rcu_assign_pointer(new->se_lun, lun);
381                rcu_assign_pointer(new->se_lun_acl, lun_acl);
382                hlist_del_rcu(&orig->link);
383                hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
384                mutex_unlock(&nacl->lun_entry_mutex);
385
386                spin_lock(&lun->lun_deve_lock);
387                list_del(&orig->lun_link);
388                list_add_tail(&new->lun_link, &lun->lun_deve_list);
389                spin_unlock(&lun->lun_deve_lock);
390
391                kref_put(&orig->pr_kref, target_pr_kref_release);
392                wait_for_completion(&orig->pr_comp);
393
394                target_luns_data_has_changed(nacl, new, true);
395                kfree_rcu(orig, rcu_head);
396                return 0;
397        }
398
399        rcu_assign_pointer(new->se_lun, lun);
400        rcu_assign_pointer(new->se_lun_acl, lun_acl);
401        hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
402        mutex_unlock(&nacl->lun_entry_mutex);
403
404        spin_lock(&lun->lun_deve_lock);
405        list_add_tail(&new->lun_link, &lun->lun_deve_list);
406        spin_unlock(&lun->lun_deve_lock);
407
408        target_luns_data_has_changed(nacl, new, true);
409        return 0;
410}
411
412/*
413 *      Called with se_node_acl->lun_entry_mutex held.
414 */
415void core_disable_device_list_for_node(
416        struct se_lun *lun,
417        struct se_dev_entry *orig,
418        struct se_node_acl *nacl,
419        struct se_portal_group *tpg)
420{
421        /*
422         * rcu_dereference_raw protected by se_lun->lun_group symlink
423         * reference to se_device->dev_group.
424         */
425        struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
426        /*
427         * If the MappedLUN entry is being disabled, the entry in
428         * lun->lun_deve_list must be removed now before clearing the
429         * struct se_dev_entry pointers below as logic in
430         * core_alua_do_transition_tg_pt() depends on these being present.
431         *
432         * deve->se_lun_acl will be NULL for demo-mode created LUNs
433         * that have not been explicitly converted to MappedLUNs ->
434         * struct se_lun_acl, but we remove deve->lun_link from
435         * lun->lun_deve_list. This also means that active UAs and
436         * NodeACL context specific PR metadata for demo-mode
437         * MappedLUN *deve will be released below..
438         */
439        spin_lock(&lun->lun_deve_lock);
440        list_del(&orig->lun_link);
441        spin_unlock(&lun->lun_deve_lock);
442        /*
443         * Disable struct se_dev_entry LUN ACL mapping
444         */
445        core_scsi3_ua_release_all(orig);
446
447        hlist_del_rcu(&orig->link);
448        clear_bit(DEF_PR_REG_ACTIVE, &orig->deve_flags);
449        orig->lun_flags = 0;
450        orig->creation_time = 0;
451        orig->attach_count--;
452        /*
453         * Before firing off RCU callback, wait for any in process SPEC_I_PT=1
454         * or REGISTER_AND_MOVE PR operation to complete.
455         */
456        kref_put(&orig->pr_kref, target_pr_kref_release);
457        wait_for_completion(&orig->pr_comp);
458
459        rcu_assign_pointer(orig->se_lun, NULL);
460        rcu_assign_pointer(orig->se_lun_acl, NULL);
461
462        kfree_rcu(orig, rcu_head);
463
464        core_scsi3_free_pr_reg_from_nacl(dev, nacl);
465        target_luns_data_has_changed(nacl, NULL, false);
466}
467
468/*      core_clear_lun_from_tpg():
469 *
470 *
471 */
472void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
473{
474        struct se_node_acl *nacl;
475        struct se_dev_entry *deve;
476
477        mutex_lock(&tpg->acl_node_mutex);
478        list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
479
480                mutex_lock(&nacl->lun_entry_mutex);
481                hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
482                        struct se_lun *tmp_lun = rcu_dereference_check(deve->se_lun,
483                                        lockdep_is_held(&nacl->lun_entry_mutex));
484
485                        if (lun != tmp_lun)
486                                continue;
487
488                        core_disable_device_list_for_node(lun, deve, nacl, tpg);
489                }
490                mutex_unlock(&nacl->lun_entry_mutex);
491        }
492        mutex_unlock(&tpg->acl_node_mutex);
493}
494
495int core_alloc_rtpi(struct se_lun *lun, struct se_device *dev)
496{
497        struct se_lun *tmp;
498
499        spin_lock(&dev->se_port_lock);
500        if (dev->export_count == 0x0000ffff) {
501                pr_warn("Reached dev->dev_port_count =="
502                                " 0x0000ffff\n");
503                spin_unlock(&dev->se_port_lock);
504                return -ENOSPC;
505        }
506again:
507        /*
508         * Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
509         * Here is the table from spc4r17 section 7.7.3.8.
510         *
511         *    Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
512         *
513         * Code      Description
514         * 0h        Reserved
515         * 1h        Relative port 1, historically known as port A
516         * 2h        Relative port 2, historically known as port B
517         * 3h to FFFFh    Relative port 3 through 65 535
518         */
519        lun->lun_rtpi = dev->dev_rpti_counter++;
520        if (!lun->lun_rtpi)
521                goto again;
522
523        list_for_each_entry(tmp, &dev->dev_sep_list, lun_dev_link) {
524                /*
525                 * Make sure RELATIVE TARGET PORT IDENTIFIER is unique
526                 * for 16-bit wrap..
527                 */
528                if (lun->lun_rtpi == tmp->lun_rtpi)
529                        goto again;
530        }
531        spin_unlock(&dev->se_port_lock);
532
533        return 0;
534}
535
536static void se_release_vpd_for_dev(struct se_device *dev)
537{
538        struct t10_vpd *vpd, *vpd_tmp;
539
540        spin_lock(&dev->t10_wwn.t10_vpd_lock);
541        list_for_each_entry_safe(vpd, vpd_tmp,
542                        &dev->t10_wwn.t10_vpd_list, vpd_list) {
543                list_del(&vpd->vpd_list);
544                kfree(vpd);
545        }
546        spin_unlock(&dev->t10_wwn.t10_vpd_lock);
547}
548
549static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
550{
551        u32 aligned_max_sectors;
552        u32 alignment;
553        /*
554         * Limit max_sectors to a PAGE_SIZE aligned value for modern
555         * transport_allocate_data_tasks() operation.
556         */
557        alignment = max(1ul, PAGE_SIZE / block_size);
558        aligned_max_sectors = rounddown(max_sectors, alignment);
559
560        if (max_sectors != aligned_max_sectors)
561                pr_info("Rounding down aligned max_sectors from %u to %u\n",
562                        max_sectors, aligned_max_sectors);
563
564        return aligned_max_sectors;
565}
566
567int core_dev_add_lun(
568        struct se_portal_group *tpg,
569        struct se_device *dev,
570        struct se_lun *lun)
571{
572        int rc;
573
574        rc = core_tpg_add_lun(tpg, lun,
575                                TRANSPORT_LUNFLAGS_READ_WRITE, dev);
576        if (rc < 0)
577                return rc;
578
579        pr_debug("%s_TPG[%u]_LUN[%llu] - Activated %s Logical Unit from"
580                " CORE HBA: %u\n", tpg->se_tpg_tfo->get_fabric_name(),
581                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
582                tpg->se_tpg_tfo->get_fabric_name(), dev->se_hba->hba_id);
583        /*
584         * Update LUN maps for dynamically added initiators when
585         * generate_node_acl is enabled.
586         */
587        if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {
588                struct se_node_acl *acl;
589
590                mutex_lock(&tpg->acl_node_mutex);
591                list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
592                        if (acl->dynamic_node_acl &&
593                            (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||
594                             !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {
595                                core_tpg_add_node_to_devs(acl, tpg, lun);
596                        }
597                }
598                mutex_unlock(&tpg->acl_node_mutex);
599        }
600
601        return 0;
602}
603
604/*      core_dev_del_lun():
605 *
606 *
607 */
608void core_dev_del_lun(
609        struct se_portal_group *tpg,
610        struct se_lun *lun)
611{
612        pr_debug("%s_TPG[%u]_LUN[%llu] - Deactivating %s Logical Unit from"
613                " device object\n", tpg->se_tpg_tfo->get_fabric_name(),
614                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
615                tpg->se_tpg_tfo->get_fabric_name());
616
617        core_tpg_remove_lun(tpg, lun);
618}
619
620struct se_lun_acl *core_dev_init_initiator_node_lun_acl(
621        struct se_portal_group *tpg,
622        struct se_node_acl *nacl,
623        u64 mapped_lun,
624        int *ret)
625{
626        struct se_lun_acl *lacl;
627
628        if (strlen(nacl->initiatorname) >= TRANSPORT_IQN_LEN) {
629                pr_err("%s InitiatorName exceeds maximum size.\n",
630                        tpg->se_tpg_tfo->get_fabric_name());
631                *ret = -EOVERFLOW;
632                return NULL;
633        }
634        lacl = kzalloc(sizeof(struct se_lun_acl), GFP_KERNEL);
635        if (!lacl) {
636                pr_err("Unable to allocate memory for struct se_lun_acl.\n");
637                *ret = -ENOMEM;
638                return NULL;
639        }
640
641        lacl->mapped_lun = mapped_lun;
642        lacl->se_lun_nacl = nacl;
643
644        return lacl;
645}
646
647int core_dev_add_initiator_node_lun_acl(
648        struct se_portal_group *tpg,
649        struct se_lun_acl *lacl,
650        struct se_lun *lun,
651        u32 lun_access)
652{
653        struct se_node_acl *nacl = lacl->se_lun_nacl;
654        /*
655         * rcu_dereference_raw protected by se_lun->lun_group symlink
656         * reference to se_device->dev_group.
657         */
658        struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
659
660        if (!nacl)
661                return -EINVAL;
662
663        if ((lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) &&
664            (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE))
665                lun_access = TRANSPORT_LUNFLAGS_READ_ONLY;
666
667        lacl->se_lun = lun;
668
669        if (core_enable_device_list_for_node(lun, lacl, lacl->mapped_lun,
670                        lun_access, nacl, tpg) < 0)
671                return -EINVAL;
672
673        pr_debug("%s_TPG[%hu]_LUN[%llu->%llu] - Added %s ACL for "
674                " InitiatorNode: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
675                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun, lacl->mapped_lun,
676                (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) ? "RW" : "RO",
677                nacl->initiatorname);
678        /*
679         * Check to see if there are any existing persistent reservation APTPL
680         * pre-registrations that need to be enabled for this LUN ACL..
681         */
682        core_scsi3_check_aptpl_registration(dev, tpg, lun, nacl,
683                                            lacl->mapped_lun);
684        return 0;
685}
686
687int core_dev_del_initiator_node_lun_acl(
688        struct se_lun *lun,
689        struct se_lun_acl *lacl)
690{
691        struct se_portal_group *tpg = lun->lun_tpg;
692        struct se_node_acl *nacl;
693        struct se_dev_entry *deve;
694
695        nacl = lacl->se_lun_nacl;
696        if (!nacl)
697                return -EINVAL;
698
699        mutex_lock(&nacl->lun_entry_mutex);
700        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
701        if (deve)
702                core_disable_device_list_for_node(lun, deve, nacl, tpg);
703        mutex_unlock(&nacl->lun_entry_mutex);
704
705        pr_debug("%s_TPG[%hu]_LUN[%llu] - Removed ACL for"
706                " InitiatorNode: %s Mapped LUN: %llu\n",
707                tpg->se_tpg_tfo->get_fabric_name(),
708                tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
709                nacl->initiatorname, lacl->mapped_lun);
710
711        return 0;
712}
713
714void core_dev_free_initiator_node_lun_acl(
715        struct se_portal_group *tpg,
716        struct se_lun_acl *lacl)
717{
718        pr_debug("%s_TPG[%hu] - Freeing ACL for %s InitiatorNode: %s"
719                " Mapped LUN: %llu\n", tpg->se_tpg_tfo->get_fabric_name(),
720                tpg->se_tpg_tfo->tpg_get_tag(tpg),
721                tpg->se_tpg_tfo->get_fabric_name(),
722                lacl->se_lun_nacl->initiatorname, lacl->mapped_lun);
723
724        kfree(lacl);
725}
726
727static void scsi_dump_inquiry(struct se_device *dev)
728{
729        struct t10_wwn *wwn = &dev->t10_wwn;
730        char buf[17];
731        int i, device_type;
732        /*
733         * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
734         */
735        for (i = 0; i < 8; i++)
736                if (wwn->vendor[i] >= 0x20)
737                        buf[i] = wwn->vendor[i];
738                else
739                        buf[i] = ' ';
740        buf[i] = '\0';
741        pr_debug("  Vendor: %s\n", buf);
742
743        for (i = 0; i < 16; i++)
744                if (wwn->model[i] >= 0x20)
745                        buf[i] = wwn->model[i];
746                else
747                        buf[i] = ' ';
748        buf[i] = '\0';
749        pr_debug("  Model: %s\n", buf);
750
751        for (i = 0; i < 4; i++)
752                if (wwn->revision[i] >= 0x20)
753                        buf[i] = wwn->revision[i];
754                else
755                        buf[i] = ' ';
756        buf[i] = '\0';
757        pr_debug("  Revision: %s\n", buf);
758
759        device_type = dev->transport->get_device_type(dev);
760        pr_debug("  Type:   %s ", scsi_device_type(device_type));
761}
762
763struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
764{
765        struct se_device *dev;
766        struct se_lun *xcopy_lun;
767
768        dev = hba->backend->ops->alloc_device(hba, name);
769        if (!dev)
770                return NULL;
771
772        dev->dev_link_magic = SE_DEV_LINK_MAGIC;
773        dev->se_hba = hba;
774        dev->transport = hba->backend->ops;
775        dev->prot_length = sizeof(struct t10_pi_tuple);
776        dev->hba_index = hba->hba_index;
777
778        INIT_LIST_HEAD(&dev->dev_list);
779        INIT_LIST_HEAD(&dev->dev_sep_list);
780        INIT_LIST_HEAD(&dev->dev_tmr_list);
781        INIT_LIST_HEAD(&dev->delayed_cmd_list);
782        INIT_LIST_HEAD(&dev->state_list);
783        INIT_LIST_HEAD(&dev->qf_cmd_list);
784        INIT_LIST_HEAD(&dev->g_dev_node);
785        spin_lock_init(&dev->execute_task_lock);
786        spin_lock_init(&dev->delayed_cmd_lock);
787        spin_lock_init(&dev->dev_reservation_lock);
788        spin_lock_init(&dev->se_port_lock);
789        spin_lock_init(&dev->se_tmr_lock);
790        spin_lock_init(&dev->qf_cmd_lock);
791        sema_init(&dev->caw_sem, 1);
792        INIT_LIST_HEAD(&dev->t10_wwn.t10_vpd_list);
793        spin_lock_init(&dev->t10_wwn.t10_vpd_lock);
794        INIT_LIST_HEAD(&dev->t10_pr.registration_list);
795        INIT_LIST_HEAD(&dev->t10_pr.aptpl_reg_list);
796        spin_lock_init(&dev->t10_pr.registration_lock);
797        spin_lock_init(&dev->t10_pr.aptpl_reg_lock);
798        INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
799        spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
800        INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
801        spin_lock_init(&dev->t10_alua.lba_map_lock);
802
803        dev->t10_wwn.t10_dev = dev;
804        dev->t10_alua.t10_dev = dev;
805
806        dev->dev_attrib.da_dev = dev;
807        dev->dev_attrib.emulate_model_alias = DA_EMULATE_MODEL_ALIAS;
808        dev->dev_attrib.emulate_dpo = 1;
809        dev->dev_attrib.emulate_fua_write = 1;
810        dev->dev_attrib.emulate_fua_read = 1;
811        dev->dev_attrib.emulate_write_cache = DA_EMULATE_WRITE_CACHE;
812        dev->dev_attrib.emulate_ua_intlck_ctrl = DA_EMULATE_UA_INTLLCK_CTRL;
813        dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;
814        dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;
815        dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;
816        dev->dev_attrib.emulate_caw = DA_EMULATE_CAW;
817        dev->dev_attrib.emulate_3pc = DA_EMULATE_3PC;
818        dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE0_PROT;
819        dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
820        dev->dev_attrib.force_pr_aptpl = DA_FORCE_PR_APTPL;
821        dev->dev_attrib.is_nonrot = DA_IS_NONROT;
822        dev->dev_attrib.emulate_rest_reord = DA_EMULATE_REST_REORD;
823        dev->dev_attrib.max_unmap_lba_count = DA_MAX_UNMAP_LBA_COUNT;
824        dev->dev_attrib.max_unmap_block_desc_count =
825                DA_MAX_UNMAP_BLOCK_DESC_COUNT;
826        dev->dev_attrib.unmap_granularity = DA_UNMAP_GRANULARITY_DEFAULT;
827        dev->dev_attrib.unmap_granularity_alignment =
828                                DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT;
829        dev->dev_attrib.max_write_same_len = DA_MAX_WRITE_SAME_LEN;
830
831        xcopy_lun = &dev->xcopy_lun;
832        rcu_assign_pointer(xcopy_lun->lun_se_dev, dev);
833        init_completion(&xcopy_lun->lun_ref_comp);
834        init_completion(&xcopy_lun->lun_shutdown_comp);
835        INIT_LIST_HEAD(&xcopy_lun->lun_deve_list);
836        INIT_LIST_HEAD(&xcopy_lun->lun_dev_link);
837        mutex_init(&xcopy_lun->lun_tg_pt_md_mutex);
838        xcopy_lun->lun_tpg = &xcopy_pt_tpg;
839
840        return dev;
841}
842
843/*
844 * Check if the underlying struct block_device request_queue supports
845 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
846 * in ATA and we need to set TPE=1
847 */
848bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
849                                       struct request_queue *q)
850{
851        int block_size = queue_logical_block_size(q);
852
853        if (!blk_queue_discard(q))
854                return false;
855
856        attrib->max_unmap_lba_count =
857                q->limits.max_discard_sectors >> (ilog2(block_size) - 9);
858        /*
859         * Currently hardcoded to 1 in Linux/SCSI code..
860         */
861        attrib->max_unmap_block_desc_count = 1;
862        attrib->unmap_granularity = q->limits.discard_granularity / block_size;
863        attrib->unmap_granularity_alignment = q->limits.discard_alignment /
864                                                                block_size;
865        return true;
866}
867EXPORT_SYMBOL(target_configure_unmap_from_queue);
868
869/*
870 * Convert from blocksize advertised to the initiator to the 512 byte
871 * units unconditionally used by the Linux block layer.
872 */
873sector_t target_to_linux_sector(struct se_device *dev, sector_t lb)
874{
875        switch (dev->dev_attrib.block_size) {
876        case 4096:
877                return lb << 3;
878        case 2048:
879                return lb << 2;
880        case 1024:
881                return lb << 1;
882        default:
883                return lb;
884        }
885}
886EXPORT_SYMBOL(target_to_linux_sector);
887
888int target_configure_device(struct se_device *dev)
889{
890        struct se_hba *hba = dev->se_hba;
891        int ret;
892
893        if (dev->dev_flags & DF_CONFIGURED) {
894                pr_err("se_dev->se_dev_ptr already set for storage"
895                                " object\n");
896                return -EEXIST;
897        }
898
899        ret = dev->transport->configure_device(dev);
900        if (ret)
901                goto out;
902        /*
903         * XXX: there is not much point to have two different values here..
904         */
905        dev->dev_attrib.block_size = dev->dev_attrib.hw_block_size;
906        dev->dev_attrib.queue_depth = dev->dev_attrib.hw_queue_depth;
907
908        /*
909         * Align max_hw_sectors down to PAGE_SIZE I/O transfers
910         */
911        dev->dev_attrib.hw_max_sectors =
912                se_dev_align_max_sectors(dev->dev_attrib.hw_max_sectors,
913                                         dev->dev_attrib.hw_block_size);
914        dev->dev_attrib.optimal_sectors = dev->dev_attrib.hw_max_sectors;
915
916        dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
917        dev->creation_time = get_jiffies_64();
918
919        ret = core_setup_alua(dev);
920        if (ret)
921                goto out;
922
923        /*
924         * Startup the struct se_device processing thread
925         */
926        dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
927                                      dev->transport->name);
928        if (!dev->tmr_wq) {
929                pr_err("Unable to create tmr workqueue for %s\n",
930                        dev->transport->name);
931                ret = -ENOMEM;
932                goto out_free_alua;
933        }
934
935        /*
936         * Setup work_queue for QUEUE_FULL
937         */
938        INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
939
940        /*
941         * Preload the initial INQUIRY const values if we are doing
942         * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
943         * passthrough because this is being provided by the backend LLD.
944         */
945        if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)) {
946                strncpy(&dev->t10_wwn.vendor[0], "LIO-ORG", 8);
947                strncpy(&dev->t10_wwn.model[0],
948                        dev->transport->inquiry_prod, 16);
949                strncpy(&dev->t10_wwn.revision[0],
950                        dev->transport->inquiry_rev, 4);
951        }
952
953        scsi_dump_inquiry(dev);
954
955        spin_lock(&hba->device_lock);
956        hba->dev_count++;
957        spin_unlock(&hba->device_lock);
958
959        mutex_lock(&g_device_mutex);
960        list_add_tail(&dev->g_dev_node, &g_device_list);
961        mutex_unlock(&g_device_mutex);
962
963        dev->dev_flags |= DF_CONFIGURED;
964
965        return 0;
966
967out_free_alua:
968        core_alua_free_lu_gp_mem(dev);
969out:
970        se_release_vpd_for_dev(dev);
971        return ret;
972}
973
974void target_free_device(struct se_device *dev)
975{
976        struct se_hba *hba = dev->se_hba;
977
978        WARN_ON(!list_empty(&dev->dev_sep_list));
979
980        if (dev->dev_flags & DF_CONFIGURED) {
981                destroy_workqueue(dev->tmr_wq);
982
983                mutex_lock(&g_device_mutex);
984                list_del(&dev->g_dev_node);
985                mutex_unlock(&g_device_mutex);
986
987                spin_lock(&hba->device_lock);
988                hba->dev_count--;
989                spin_unlock(&hba->device_lock);
990        }
991
992        core_alua_free_lu_gp_mem(dev);
993        core_alua_set_lba_map(dev, NULL, 0, 0);
994        core_scsi3_free_all_registrations(dev);
995        se_release_vpd_for_dev(dev);
996
997        if (dev->transport->free_prot)
998                dev->transport->free_prot(dev);
999
1000        dev->transport->free_device(dev);
1001}
1002
1003int core_dev_setup_virtual_lun0(void)
1004{
1005        struct se_hba *hba;
1006        struct se_device *dev;
1007        char buf[] = "rd_pages=8,rd_nullio=1";
1008        int ret;
1009
1010        hba = core_alloc_hba("rd_mcp", 0, HBA_FLAGS_INTERNAL_USE);
1011        if (IS_ERR(hba))
1012                return PTR_ERR(hba);
1013
1014        dev = target_alloc_device(hba, "virt_lun0");
1015        if (!dev) {
1016                ret = -ENOMEM;
1017                goto out_free_hba;
1018        }
1019
1020        hba->backend->ops->set_configfs_dev_params(dev, buf, sizeof(buf));
1021
1022        ret = target_configure_device(dev);
1023        if (ret)
1024                goto out_free_se_dev;
1025
1026        lun0_hba = hba;
1027        g_lun0_dev = dev;
1028        return 0;
1029
1030out_free_se_dev:
1031        target_free_device(dev);
1032out_free_hba:
1033        core_delete_hba(hba);
1034        return ret;
1035}
1036
1037
1038void core_dev_release_virtual_lun0(void)
1039{
1040        struct se_hba *hba = lun0_hba;
1041
1042        if (!hba)
1043                return;
1044
1045        if (g_lun0_dev)
1046                target_free_device(g_lun0_dev);
1047        core_delete_hba(hba);
1048}
1049
1050/*
1051 * Common CDB parsing for kernel and user passthrough.
1052 */
1053sense_reason_t
1054passthrough_parse_cdb(struct se_cmd *cmd,
1055        sense_reason_t (*exec_cmd)(struct se_cmd *cmd))
1056{
1057        unsigned char *cdb = cmd->t_task_cdb;
1058
1059        /*
1060         * Clear a lun set in the cdb if the initiator talking to use spoke
1061         * and old standards version, as we can't assume the underlying device
1062         * won't choke up on it.
1063         */
1064        switch (cdb[0]) {
1065        case READ_10: /* SBC - RDProtect */
1066        case READ_12: /* SBC - RDProtect */
1067        case READ_16: /* SBC - RDProtect */
1068        case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1069        case VERIFY: /* SBC - VRProtect */
1070        case VERIFY_16: /* SBC - VRProtect */
1071        case WRITE_VERIFY: /* SBC - VRProtect */
1072        case WRITE_VERIFY_12: /* SBC - VRProtect */
1073        case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1074                break;
1075        default:
1076                cdb[1] &= 0x1f; /* clear logical unit number */
1077                break;
1078        }
1079
1080        /*
1081         * For REPORT LUNS we always need to emulate the response, for everything
1082         * else, pass it up.
1083         */
1084        if (cdb[0] == REPORT_LUNS) {
1085                cmd->execute_cmd = spc_emulate_report_luns;
1086                return TCM_NO_SENSE;
1087        }
1088
1089        /* Set DATA_CDB flag for ops that should have it */
1090        switch (cdb[0]) {
1091        case READ_6:
1092        case READ_10:
1093        case READ_12:
1094        case READ_16:
1095        case WRITE_6:
1096        case WRITE_10:
1097        case WRITE_12:
1098        case WRITE_16:
1099        case WRITE_VERIFY:
1100        case WRITE_VERIFY_12:
1101        case 0x8e: /* WRITE_VERIFY_16 */
1102        case COMPARE_AND_WRITE:
1103        case XDWRITEREAD_10:
1104                cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1105                break;
1106        case VARIABLE_LENGTH_CMD:
1107                switch (get_unaligned_be16(&cdb[8])) {
1108                case READ_32:
1109                case WRITE_32:
1110                case 0x0c: /* WRITE_VERIFY_32 */
1111                case XDWRITEREAD_32:
1112                        cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
1113                        break;
1114                }
1115        }
1116
1117        cmd->execute_cmd = exec_cmd;
1118
1119        return TCM_NO_SENSE;
1120}
1121EXPORT_SYMBOL(passthrough_parse_cdb);
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