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Root/drivers/target/target_core_pscsi.c

1	/*******************************************************************************
2	* Filename: target_core_pscsi.c
3	*
4	* This file contains the generic target mode <-> Linux SCSI subsystem plugin.
5	*
6	* Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
7	* Copyright (c) 2005, 2006, 2007 SBE, Inc.
8	* Copyright (c) 2007-2010 Rising Tide Systems
9	* Copyright (c) 2008-2010 Linux-iSCSI.org
10	*
11	* Nicholas A. Bellinger <nab@kernel.org>
12	*
13	* This program is free software; you can redistribute it and/or modify
14	* it under the terms of the GNU General Public License as published by
15	* the Free Software Foundation; either version 2 of the License, or
16	* (at your option) any later version.
17	*
18	* This program is distributed in the hope that it will be useful,
19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21	* GNU General Public License for more details.
22	*
23	* You should have received a copy of the GNU General Public License
24	* along with this program; if not, write to the Free Software
25	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26	*
27	******************************************************************************/
28
29	#include <linux/string.h>
30	#include <linux/parser.h>
31	#include <linux/timer.h>
32	#include <linux/blkdev.h>
33	#include <linux/blk_types.h>
34	#include <linux/slab.h>
35	#include <linux/spinlock.h>
36	#include <linux/genhd.h>
37	#include <linux/cdrom.h>
38	#include <linux/ratelimit.h>
39	#include <linux/module.h>
40	#include <asm/unaligned.h>
41
42	#include <scsi/scsi.h>
43	#include <scsi/scsi_device.h>
44	#include <scsi/scsi_cmnd.h>
45	#include <scsi/scsi_host.h>
46	#include <scsi/scsi_tcq.h>
47
48	#include <target/target_core_base.h>
49	#include <target/target_core_backend.h>
50
51	#include "target_core_alua.h"
52	#include "target_core_pscsi.h"
53
54	#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
55
56	static struct se_subsystem_api pscsi_template;
57
58	static int pscsi_execute_cmd(struct se_cmd *cmd);
59	static void pscsi_req_done(struct request *, int);
60
61	/* pscsi_attach_hba():
62	*
63	* pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
64	* from the passed SCSI Host ID.
65	*/
66	static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
67	{
68	struct pscsi_hba_virt *phv;
69
70	phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
71	if (!phv) {
72	pr_err("Unable to allocate struct pscsi_hba_virt\n");
73	return -ENOMEM;
74	}
75	phv->phv_host_id = host_id;
76	phv->phv_mode = PHV_VIRTUAL_HOST_ID;
77
78	hba->hba_ptr = phv;
79
80	pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
81	" Generic Target Core Stack %s\n", hba->hba_id,
82	PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
83	pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
84	hba->hba_id);
85
86	return 0;
87	}
88
89	static void pscsi_detach_hba(struct se_hba *hba)
90	{
91	struct pscsi_hba_virt *phv = hba->hba_ptr;
92	struct Scsi_Host *scsi_host = phv->phv_lld_host;
93
94	if (scsi_host) {
95	scsi_host_put(scsi_host);
96
97	pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
98	" Generic Target Core\n", hba->hba_id,
99	(scsi_host->hostt->name) ? (scsi_host->hostt->name) :
100	"Unknown");
101	} else
102	pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
103	" from Generic Target Core\n", hba->hba_id);
104
105	kfree(phv);
106	hba->hba_ptr = NULL;
107	}
108
109	static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
110	{
111	struct pscsi_hba_virt *phv = hba->hba_ptr;
112	struct Scsi_Host *sh = phv->phv_lld_host;
113	/*
114	* Release the struct Scsi_Host
115	*/
116	if (!mode_flag) {
117	if (!sh)
118	return 0;
119
120	phv->phv_lld_host = NULL;
121	phv->phv_mode = PHV_VIRTUAL_HOST_ID;
122
123	pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
124	" %s\n", hba->hba_id, (sh->hostt->name) ?
125	(sh->hostt->name) : "Unknown");
126
127	scsi_host_put(sh);
128	return 0;
129	}
130	/*
131	* Otherwise, locate struct Scsi_Host from the original passed
132	* pSCSI Host ID and enable for phba mode
133	*/
134	sh = scsi_host_lookup(phv->phv_host_id);
135	if (IS_ERR(sh)) {
136	pr_err("pSCSI: Unable to locate SCSI Host for"
137	" phv_host_id: %d\n", phv->phv_host_id);
138	return PTR_ERR(sh);
139	}
140
141	phv->phv_lld_host = sh;
142	phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
143
144	pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
145	hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
146
147	return 1;
148	}
149
150	static void pscsi_tape_read_blocksize(struct se_device *dev,
151	struct scsi_device *sdev)
152	{
153	unsigned char cdb[MAX_COMMAND_SIZE], *buf;
154	int ret;
155
156	buf = kzalloc(12, GFP_KERNEL);
157	if (!buf)
158	return;
159
160	memset(cdb, 0, MAX_COMMAND_SIZE);
161	cdb[0] = MODE_SENSE;
162	cdb[4] = 0x0c; /* 12 bytes */
163
164	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
165	HZ, 1, NULL);
166	if (ret)
167	goto out_free;
168
169	/*
170	* If MODE_SENSE still returns zero, set the default value to 1024.
171	*/
172	sdev->sector_size = (buf[9] << 16) \| (buf[10] << 8) \| (buf[11]);
173	if (!sdev->sector_size)
174	sdev->sector_size = 1024;
175	out_free:
176	kfree(buf);
177	}
178
179	static void
180	pscsi_set_inquiry_info(struct scsi_device sdev, struct t10_wwn wwn)
181	{
182	unsigned char *buf;
183
184	if (sdev->inquiry_len < INQUIRY_LEN)
185	return;
186
187	buf = sdev->inquiry;
188	if (!buf)
189	return;
190	/*
191	* Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
192	*/
193	memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
194	memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
195	memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
196	}
197
198	static int
199	pscsi_get_inquiry_vpd_serial(struct scsi_device sdev, struct t10_wwn wwn)
200	{
201	unsigned char cdb[MAX_COMMAND_SIZE], *buf;
202	int ret;
203
204	buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
205	if (!buf)
206	return -ENOMEM;
207
208	memset(cdb, 0, MAX_COMMAND_SIZE);
209	cdb[0] = INQUIRY;
210	cdb[1] = 0x01; /* Query VPD */
211	cdb[2] = 0x80; /* Unit Serial Number */
212	cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
213	cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
214
215	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
216	INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
217	if (ret)
218	goto out_free;
219
220	snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
221
222	wwn->t10_sub_dev->su_dev_flags \|= SDF_FIRMWARE_VPD_UNIT_SERIAL;
223
224	kfree(buf);
225	return 0;
226
227	out_free:
228	kfree(buf);
229	return -EPERM;
230	}
231
232	static void
233	pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
234	struct t10_wwn *wwn)
235	{
236	unsigned char cdb[MAX_COMMAND_SIZE], buf, page_83;
237	int ident_len, page_len, off = 4, ret;
238	struct t10_vpd *vpd;
239
240	buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
241	if (!buf)
242	return;
243
244	memset(cdb, 0, MAX_COMMAND_SIZE);
245	cdb[0] = INQUIRY;
246	cdb[1] = 0x01; /* Query VPD */
247	cdb[2] = 0x83; /* Device Identifier */
248	cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
249	cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
250
251	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
252	INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
253	NULL, HZ, 1, NULL);
254	if (ret)
255	goto out;
256
257	page_len = (buf[2] << 8) \| buf[3];
258	while (page_len > 0) {
259	/* Grab a pointer to the Identification descriptor */
260	page_83 = &buf[off];
261	ident_len = page_83[3];
262	if (!ident_len) {
263	pr_err("page_83[3]: identifier"
264	" length zero!\n");
265	break;
266	}
267	pr_debug("T10 VPD Identifer Length: %d\n", ident_len);
268
269	vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
270	if (!vpd) {
271	pr_err("Unable to allocate memory for"
272	" struct t10_vpd\n");
273	goto out;
274	}
275	INIT_LIST_HEAD(&vpd->vpd_list);
276
277	transport_set_vpd_proto_id(vpd, page_83);
278	transport_set_vpd_assoc(vpd, page_83);
279
280	if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
281	off += (ident_len + 4);
282	page_len -= (ident_len + 4);
283	kfree(vpd);
284	continue;
285	}
286	if (transport_set_vpd_ident(vpd, page_83) < 0) {
287	off += (ident_len + 4);
288	page_len -= (ident_len + 4);
289	kfree(vpd);
290	continue;
291	}
292
293	list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
294	off += (ident_len + 4);
295	page_len -= (ident_len + 4);
296	}
297
298	out:
299	kfree(buf);
300	}
301
302	/* pscsi_add_device_to_list():
303	*
304	*
305	*/
306	static struct se_device *pscsi_add_device_to_list(
307	struct se_hba *hba,
308	struct se_subsystem_dev *se_dev,
309	struct pscsi_dev_virt *pdv,
310	struct scsi_device *sd,
311	int dev_flags)
312	{
313	struct se_device *dev;
314	struct se_dev_limits dev_limits;
315	struct request_queue *q;
316	struct queue_limits *limits;
317
318	memset(&dev_limits, 0, sizeof(struct se_dev_limits));
319
320	if (!sd->queue_depth) {
321	sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
322
323	pr_err("Set broken SCSI Device %d:%d:%d"
324	" queue_depth to %d\n", sd->channel, sd->id,
325	sd->lun, sd->queue_depth);
326	}
327	/*
328	* Setup the local scope queue_limits from struct request_queue->limits
329	* to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
330	*/
331	q = sd->request_queue;
332	limits = &dev_limits.limits;
333	limits->logical_block_size = sd->sector_size;
334	limits->max_hw_sectors = min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q));
335	limits->max_sectors = min_t(int, sd->host->max_sectors, queue_max_sectors(q));
336	dev_limits.hw_queue_depth = sd->queue_depth;
337	dev_limits.queue_depth = sd->queue_depth;
338	/*
339	* Setup our standard INQUIRY info into se_dev->t10_wwn
340	*/
341	pscsi_set_inquiry_info(sd, &se_dev->t10_wwn);
342
343	/*
344	* Set the pointer pdv->pdv_sd to from passed struct scsi_device,
345	* which has already been referenced with Linux SCSI code with
346	* scsi_device_get() in this file's pscsi_create_virtdevice().
347	*
348	* The passthrough operations called by the transport_add_device_*
349	* function below will require this pointer to be set for passthroug
350	* ops.
351	*
352	* For the shutdown case in pscsi_free_device(), this struct
353	* scsi_device reference is released with Linux SCSI code
354	* scsi_device_put() and the pdv->pdv_sd cleared.
355	*/
356	pdv->pdv_sd = sd;
357	dev = transport_add_device_to_core_hba(hba, &pscsi_template,
358	se_dev, dev_flags, pdv,
359	&dev_limits, NULL, NULL);
360	if (!dev) {
361	pdv->pdv_sd = NULL;
362	return NULL;
363	}
364
365	/*
366	* Locate VPD WWN Information used for various purposes within
367	* the Storage Engine.
368	*/
369	if (!pscsi_get_inquiry_vpd_serial(sd, &se_dev->t10_wwn)) {
370	/*
371	* If VPD Unit Serial returned GOOD status, try
372	* VPD Device Identification page (0x83).
373	*/
374	pscsi_get_inquiry_vpd_device_ident(sd, &se_dev->t10_wwn);
375	}
376
377	/*
378	* For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
379	*/
380	if (sd->type == TYPE_TAPE)
381	pscsi_tape_read_blocksize(dev, sd);
382	return dev;
383	}
384
385	static void pscsi_allocate_virtdevice(struct se_hba hba, const char *name)
386	{
387	struct pscsi_dev_virt *pdv;
388
389	pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
390	if (!pdv) {
391	pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
392	return NULL;
393	}
394	pdv->pdv_se_hba = hba;
395
396	pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
397	return pdv;
398	}
399
400	/*
401	* Called with struct Scsi_Host->host_lock called.
402	*/
403	static struct se_device *pscsi_create_type_disk(
404	struct scsi_device *sd,
405	struct pscsi_dev_virt *pdv,
406	struct se_subsystem_dev *se_dev,
407	struct se_hba *hba)
408	__releases(sh->host_lock)
409	{
410	struct se_device *dev;
411	struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
412	struct Scsi_Host *sh = sd->host;
413	struct block_device *bd;
414	u32 dev_flags = 0;
415
416	if (scsi_device_get(sd)) {
417	pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
418	sh->host_no, sd->channel, sd->id, sd->lun);
419	spin_unlock_irq(sh->host_lock);
420	return NULL;
421	}
422	spin_unlock_irq(sh->host_lock);
423	/*
424	* Claim exclusive struct block_device access to struct scsi_device
425	* for TYPE_DISK using supplied udev_path
426	*/
427	bd = blkdev_get_by_path(se_dev->se_dev_udev_path,
428	FMODE_WRITE\|FMODE_READ\|FMODE_EXCL, pdv);
429	if (IS_ERR(bd)) {
430	pr_err("pSCSI: blkdev_get_by_path() failed\n");
431	scsi_device_put(sd);
432	return NULL;
433	}
434	pdv->pdv_bd = bd;
435
436	dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
437	if (!dev) {
438	blkdev_put(pdv->pdv_bd, FMODE_WRITE\|FMODE_READ\|FMODE_EXCL);
439	scsi_device_put(sd);
440	return NULL;
441	}
442	pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
443	phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
444
445	return dev;
446	}
447
448	/*
449	* Called with struct Scsi_Host->host_lock called.
450	*/
451	static struct se_device *pscsi_create_type_rom(
452	struct scsi_device *sd,
453	struct pscsi_dev_virt *pdv,
454	struct se_subsystem_dev *se_dev,
455	struct se_hba *hba)
456	__releases(sh->host_lock)
457	{
458	struct se_device *dev;
459	struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
460	struct Scsi_Host *sh = sd->host;
461	u32 dev_flags = 0;
462
463	if (scsi_device_get(sd)) {
464	pr_err("scsi_device_get() failed for %d:%d:%d:%d\n",
465	sh->host_no, sd->channel, sd->id, sd->lun);
466	spin_unlock_irq(sh->host_lock);
467	return NULL;
468	}
469	spin_unlock_irq(sh->host_lock);
470
471	dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
472	if (!dev) {
473	scsi_device_put(sd);
474	return NULL;
475	}
476	pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
477	phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
478	sd->channel, sd->id, sd->lun);
479
480	return dev;
481	}
482
483	/*
484	*Called with struct Scsi_Host->host_lock called.
485	*/
486	static struct se_device *pscsi_create_type_other(
487	struct scsi_device *sd,
488	struct pscsi_dev_virt *pdv,
489	struct se_subsystem_dev *se_dev,
490	struct se_hba *hba)
491	__releases(sh->host_lock)
492	{
493	struct se_device *dev;
494	struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
495	struct Scsi_Host *sh = sd->host;
496	u32 dev_flags = 0;
497
498	spin_unlock_irq(sh->host_lock);
499	dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
500	if (!dev)
501	return NULL;
502
503	pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
504	phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
505	sd->channel, sd->id, sd->lun);
506
507	return dev;
508	}
509
510	static struct se_device *pscsi_create_virtdevice(
511	struct se_hba *hba,
512	struct se_subsystem_dev *se_dev,
513	void *p)
514	{
515	struct pscsi_dev_virt *pdv = p;
516	struct se_device *dev;
517	struct scsi_device *sd;
518	struct pscsi_hba_virt *phv = hba->hba_ptr;
519	struct Scsi_Host *sh = phv->phv_lld_host;
520	int legacy_mode_enable = 0;
521
522	if (!pdv) {
523	pr_err("Unable to locate struct pscsi_dev_virt"
524	" parameter\n");
525	return ERR_PTR(-EINVAL);
526	}
527	/*
528	* If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
529	* struct Scsi_Host we will need to bring the TCM/pSCSI object online
530	*/
531	if (!sh) {
532	if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
533	pr_err("pSCSI: Unable to locate struct"
534	" Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
535	return ERR_PTR(-ENODEV);
536	}
537	/*
538	* For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
539	* reference, we enforce that udev_path has been set
540	*/
541	if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
542	pr_err("pSCSI: udev_path attribute has not"
543	" been set before ENABLE=1\n");
544	return ERR_PTR(-EINVAL);
545	}
546	/*
547	* If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
548	* use the original TCM hba ID to reference Linux/SCSI Host No
549	* and enable for PHV_LLD_SCSI_HOST_NO mode.
550	*/
551	if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
552	spin_lock(&hba->device_lock);
553	if (!list_empty(&hba->hba_dev_list)) {
554	pr_err("pSCSI: Unable to set hba_mode"
555	" with active devices\n");
556	spin_unlock(&hba->device_lock);
557	return ERR_PTR(-EEXIST);
558	}
559	spin_unlock(&hba->device_lock);
560
561	if (pscsi_pmode_enable_hba(hba, 1) != 1)
562	return ERR_PTR(-ENODEV);
563
564	legacy_mode_enable = 1;
565	hba->hba_flags \|= HBA_FLAGS_PSCSI_MODE;
566	sh = phv->phv_lld_host;
567	} else {
568	sh = scsi_host_lookup(pdv->pdv_host_id);
569	if (IS_ERR(sh)) {
570	pr_err("pSCSI: Unable to locate"
571	" pdv_host_id: %d\n", pdv->pdv_host_id);
572	return ERR_CAST(sh);
573	}
574	}
575	} else {
576	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
577	pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
578	" struct Scsi_Host exists\n");
579	return ERR_PTR(-EEXIST);
580	}
581	}
582
583	spin_lock_irq(sh->host_lock);
584	list_for_each_entry(sd, &sh->__devices, siblings) {
585	if ((pdv->pdv_channel_id != sd->channel) \|\|
586	(pdv->pdv_target_id != sd->id) \|\|
587	(pdv->pdv_lun_id != sd->lun))
588	continue;
589	/*
590	* Functions will release the held struct scsi_host->host_lock
591	* before calling calling pscsi_add_device_to_list() to register
592	* struct scsi_device with target_core_mod.
593	*/
594	switch (sd->type) {
595	case TYPE_DISK:
596	dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
597	break;
598	case TYPE_ROM:
599	dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
600	break;
601	default:
602	dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
603	break;
604	}
605
606	if (!dev) {
607	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
608	scsi_host_put(sh);
609	else if (legacy_mode_enable) {
610	pscsi_pmode_enable_hba(hba, 0);
611	hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
612	}
613	pdv->pdv_sd = NULL;
614	return ERR_PTR(-ENODEV);
615	}
616	return dev;
617	}
618	spin_unlock_irq(sh->host_lock);
619
620	pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
621	pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
622
623	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
624	scsi_host_put(sh);
625	else if (legacy_mode_enable) {
626	pscsi_pmode_enable_hba(hba, 0);
627	hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
628	}
629
630	return ERR_PTR(-ENODEV);
631	}
632
633	/* pscsi_free_device(): (Part of se_subsystem_api_t template)
634	*
635	*
636	*/
637	static void pscsi_free_device(void *p)
638	{
639	struct pscsi_dev_virt *pdv = p;
640	struct pscsi_hba_virt *phv = pdv->pdv_se_hba->hba_ptr;
641	struct scsi_device *sd = pdv->pdv_sd;
642
643	if (sd) {
644	/*
645	* Release exclusive pSCSI internal struct block_device claim for
646	* struct scsi_device with TYPE_DISK from pscsi_create_type_disk()
647	*/
648	if ((sd->type == TYPE_DISK) && pdv->pdv_bd) {
649	blkdev_put(pdv->pdv_bd,
650	FMODE_WRITE\|FMODE_READ\|FMODE_EXCL);
651	pdv->pdv_bd = NULL;
652	}
653	/*
654	* For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
655	* to struct Scsi_Host now.
656	*/
657	if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
658	(phv->phv_lld_host != NULL))
659	scsi_host_put(phv->phv_lld_host);
660
661	if ((sd->type == TYPE_DISK) \|\| (sd->type == TYPE_ROM))
662	scsi_device_put(sd);
663
664	pdv->pdv_sd = NULL;
665	}
666
667	kfree(pdv);
668	}
669
670	static void pscsi_transport_complete(struct se_cmd cmd, struct scatterlist sg,
671	unsigned char *sense_buffer)
672	{
673	struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
674	struct scsi_device *sd = pdv->pdv_sd;
675	int result;
676	struct pscsi_plugin_task *pt = cmd->priv;
677	unsigned char *cdb;
678	/*
679	* Special case for REPORT_LUNs handling where pscsi_plugin_task has
680	* not been allocated because TCM is handling the emulation directly.
681	*/
682	if (!pt)
683	return;
684
685	cdb = &pt->pscsi_cdb[0];
686	result = pt->pscsi_result;
687	/*
688	* Hack to make sure that Write-Protect modepage is set if R/O mode is
689	* forced.
690	*/
691	if (!cmd->se_deve \|\| !cmd->data_length)
692	goto after_mode_sense;
693
694	if (((cdb[0] == MODE_SENSE) \|\| (cdb[0] == MODE_SENSE_10)) &&
695	(status_byte(result) << 1) == SAM_STAT_GOOD) {
696	if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY) {
697	unsigned char *buf = transport_kmap_data_sg(cmd);
698
699	if (cdb[0] == MODE_SENSE_10) {
700	if (!(buf[3] & 0x80))
701	buf[3] \|= 0x80;
702	} else {
703	if (!(buf[2] & 0x80))
704	buf[2] \|= 0x80;
705	}
706
707	transport_kunmap_data_sg(cmd);
708	}
709	}
710	after_mode_sense:
711
712	if (sd->type != TYPE_TAPE \|\| !cmd->data_length)
713	goto after_mode_select;
714
715	/*
716	* Hack to correctly obtain the initiator requested blocksize for
717	* TYPE_TAPE. Since this value is dependent upon each tape media,
718	* struct scsi_device->sector_size will not contain the correct value
719	* by default, so we go ahead and set it so
720	* TRANSPORT(dev)->get_blockdev() returns the correct value to the
721	* storage engine.
722	*/
723	if (((cdb[0] == MODE_SELECT) \|\| (cdb[0] == MODE_SELECT_10)) &&
724	(status_byte(result) << 1) == SAM_STAT_GOOD) {
725	unsigned char *buf;
726	u16 bdl;
727	u32 blocksize;
728
729	buf = sg_virt(&sg[0]);
730	if (!buf) {
731	pr_err("Unable to get buf for scatterlist\n");
732	goto after_mode_select;
733	}
734
735	if (cdb[0] == MODE_SELECT)
736	bdl = (buf[3]);
737	else
738	bdl = (buf[6] << 8) \| (buf[7]);
739
740	if (!bdl)
741	goto after_mode_select;
742
743	if (cdb[0] == MODE_SELECT)
744	blocksize = (buf[9] << 16) \| (buf[10] << 8) \|
745	(buf[11]);
746	else
747	blocksize = (buf[13] << 16) \| (buf[14] << 8) \|
748	(buf[15]);
749
750	sd->sector_size = blocksize;
751	}
752	after_mode_select:
753
754	if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
755	memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
756	cmd->se_cmd_flags \|= SCF_TRANSPORT_TASK_SENSE;
757	}
758	}
759
760	enum {
761	Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
762	Opt_scsi_lun_id, Opt_err
763	};
764
765	static match_table_t tokens = {
766	{Opt_scsi_host_id, "scsi_host_id=%d"},
767	{Opt_scsi_channel_id, "scsi_channel_id=%d"},
768	{Opt_scsi_target_id, "scsi_target_id=%d"},
769	{Opt_scsi_lun_id, "scsi_lun_id=%d"},
770	{Opt_err, NULL}
771	};
772
773	static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
774	struct se_subsystem_dev *se_dev,
775	const char *page,
776	ssize_t count)
777	{
778	struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
779	struct pscsi_hba_virt *phv = hba->hba_ptr;
780	char orig, ptr, *opts;
781	substring_t args[MAX_OPT_ARGS];
782	int ret = 0, arg, token;
783
784	opts = kstrdup(page, GFP_KERNEL);
785	if (!opts)
786	return -ENOMEM;
787
788	orig = opts;
789
790	while ((ptr = strsep(&opts, ",\n")) != NULL) {
791	if (!*ptr)
792	continue;
793
794	token = match_token(ptr, tokens, args);
795	switch (token) {
796	case Opt_scsi_host_id:
797	if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
798	pr_err("PSCSI[%d]: Unable to accept"
799	" scsi_host_id while phv_mode =="
800	" PHV_LLD_SCSI_HOST_NO\n",
801	phv->phv_host_id);
802	ret = -EINVAL;
803	goto out;
804	}
805	match_int(args, &arg);
806	pdv->pdv_host_id = arg;
807	pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
808	" %d\n", phv->phv_host_id, pdv->pdv_host_id);
809	pdv->pdv_flags \|= PDF_HAS_VIRT_HOST_ID;
810	break;
811	case Opt_scsi_channel_id:
812	match_int(args, &arg);
813	pdv->pdv_channel_id = arg;
814	pr_debug("PSCSI[%d]: Referencing SCSI Channel"
815	" ID: %d\n", phv->phv_host_id,
816	pdv->pdv_channel_id);
817	pdv->pdv_flags \|= PDF_HAS_CHANNEL_ID;
818	break;
819	case Opt_scsi_target_id:
820	match_int(args, &arg);
821	pdv->pdv_target_id = arg;
822	pr_debug("PSCSI[%d]: Referencing SCSI Target"
823	" ID: %d\n", phv->phv_host_id,
824	pdv->pdv_target_id);
825	pdv->pdv_flags \|= PDF_HAS_TARGET_ID;
826	break;
827	case Opt_scsi_lun_id:
828	match_int(args, &arg);
829	pdv->pdv_lun_id = arg;
830	pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
831	" %d\n", phv->phv_host_id, pdv->pdv_lun_id);
832	pdv->pdv_flags \|= PDF_HAS_LUN_ID;
833	break;
834	default:
835	break;
836	}
837	}
838
839	out:
840	kfree(orig);
841	return (!ret) ? count : ret;
842	}
843
844	static ssize_t pscsi_check_configfs_dev_params(
845	struct se_hba *hba,
846	struct se_subsystem_dev *se_dev)
847	{
848	struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
849
850	if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) \|\|
851	!(pdv->pdv_flags & PDF_HAS_TARGET_ID) \|\|
852	!(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
853	pr_err("Missing scsi_channel_id=, scsi_target_id= and"
854	" scsi_lun_id= parameters\n");
855	return -EINVAL;
856	}
857
858	return 0;
859	}
860
861	static ssize_t pscsi_show_configfs_dev_params(struct se_hba *hba,
862	struct se_subsystem_dev *se_dev,
863	char *b)
864	{
865	struct pscsi_hba_virt *phv = hba->hba_ptr;
866	struct pscsi_dev_virt *pdv = se_dev->se_dev_su_ptr;
867	struct scsi_device *sd = pdv->pdv_sd;
868	unsigned char host_id[16];
869	ssize_t bl;
870	int i;
871
872	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
873	snprintf(host_id, 16, "%d", pdv->pdv_host_id);
874	else
875	snprintf(host_id, 16, "PHBA Mode");
876
877	bl = sprintf(b, "SCSI Device Bus Location:"
878	" Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
879	pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
880	host_id);
881
882	if (sd) {
883	bl += sprintf(b + bl, " ");
884	bl += sprintf(b + bl, "Vendor: ");
885	for (i = 0; i < 8; i++) {
886	if (ISPRINT(sd->vendor[i])) /* printable character? */
887	bl += sprintf(b + bl, "%c", sd->vendor[i]);
888	else
889	bl += sprintf(b + bl, " ");
890	}
891	bl += sprintf(b + bl, " Model: ");
892	for (i = 0; i < 16; i++) {
893	if (ISPRINT(sd->model[i])) /* printable character ? */
894	bl += sprintf(b + bl, "%c", sd->model[i]);
895	else
896	bl += sprintf(b + bl, " ");
897	}
898	bl += sprintf(b + bl, " Rev: ");
899	for (i = 0; i < 4; i++) {
900	if (ISPRINT(sd->rev[i])) /* printable character ? */
901	bl += sprintf(b + bl, "%c", sd->rev[i]);
902	else
903	bl += sprintf(b + bl, " ");
904	}
905	bl += sprintf(b + bl, "\n");
906	}
907	return bl;
908	}
909
910	static void pscsi_bi_endio(struct bio *bio, int error)
911	{
912	bio_put(bio);
913	}
914
915	static inline struct bio *pscsi_get_bio(int sg_num)
916	{
917	struct bio *bio;
918	/*
919	* Use bio_malloc() following the comment in for bio -> struct request
920	* in block/blk-core.c:blk_make_request()
921	*/
922	bio = bio_kmalloc(GFP_KERNEL, sg_num);
923	if (!bio) {
924	pr_err("PSCSI: bio_kmalloc() failed\n");
925	return NULL;
926	}
927	bio->bi_end_io = pscsi_bi_endio;
928
929	return bio;
930	}
931
932	static int pscsi_map_sg(struct se_cmd cmd, struct scatterlist sgl,
933	u32 sgl_nents, enum dma_data_direction data_direction,
934	struct bio **hbio)
935	{
936	struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
937	struct bio bio = NULL, tbio = NULL;
938	struct page *page;
939	struct scatterlist *sg;
940	u32 data_len = cmd->data_length, i, len, bytes, off;
941	int nr_pages = (cmd->data_length + sgl[0].offset +
942	PAGE_SIZE - 1) >> PAGE_SHIFT;
943	int nr_vecs = 0, rc;
944	int rw = (data_direction == DMA_TO_DEVICE);
945
946	*hbio = NULL;
947
948	pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
949
950	for_each_sg(sgl, sg, sgl_nents, i) {
951	page = sg_page(sg);
952	off = sg->offset;
953	len = sg->length;
954
955	pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
956	page, len, off);
957
958	while (len > 0 && data_len > 0) {
959	bytes = min_t(unsigned int, len, PAGE_SIZE - off);
960	bytes = min(bytes, data_len);
961
962	if (!bio) {
963	nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
964	nr_pages -= nr_vecs;
965	/*
966	* Calls bio_kmalloc() and sets bio->bi_end_io()
967	*/
968	bio = pscsi_get_bio(nr_vecs);
969	if (!bio)
970	goto fail;
971
972	if (rw)
973	bio->bi_rw \|= REQ_WRITE;
974
975	pr_debug("PSCSI: Allocated bio: %p,"
976	" dir: %s nr_vecs: %d\n", bio,
977	(rw) ? "rw" : "r", nr_vecs);
978	/*
979	* Set *hbio pointer to handle the case:
980	* nr_pages > BIO_MAX_PAGES, where additional
981	* bios need to be added to complete a given
982	* command.
983	*/
984	if (!*hbio)
985	*hbio = tbio = bio;
986	else
987	tbio = tbio->bi_next = bio;
988	}
989
990	pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
991	" bio: %p page: %p len: %d off: %d\n", i, bio,
992	page, len, off);
993
994	rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
995	bio, page, bytes, off);
996	if (rc != bytes)
997	goto fail;
998
999	pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
1000	bio->bi_vcnt, nr_vecs);
1001
1002	if (bio->bi_vcnt > nr_vecs) {
1003	pr_debug("PSCSI: Reached bio->bi_vcnt max:"
1004	" %d i: %d bio: %p, allocating another"
1005	" bio\n", bio->bi_vcnt, i, bio);
1006	/*
1007	* Clear the pointer so that another bio will
1008	* be allocated with pscsi_get_bio() above, the
1009	* current bio has already been set *tbio and
1010	* bio->bi_next.
1011	*/
1012	bio = NULL;
1013	}
1014
1015	page++;
1016	len -= bytes;
1017	data_len -= bytes;
1018	off = 0;
1019	}
1020	}
1021
1022	return sgl_nents;
1023	fail:
1024	while (*hbio) {
1025	bio = *hbio;
1026	hbio = (hbio)->bi_next;
1027	bio->bi_next = NULL;
1028	bio_endio(bio, 0); /* XXX: should be error */
1029	}
1030	cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1031	return -ENOMEM;
1032	}
1033
1034	/*
1035	* Clear a lun set in the cdb if the initiator talking to use spoke
1036	* and old standards version, as we can't assume the underlying device
1037	* won't choke up on it.
1038	*/
1039	static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
1040	{
1041	switch (cdb[0]) {
1042	case READ_10: /* SBC - RDProtect */
1043	case READ_12: /* SBC - RDProtect */
1044	case READ_16: /* SBC - RDProtect */
1045	case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1046	case VERIFY: /* SBC - VRProtect */
1047	case VERIFY_16: /* SBC - VRProtect */
1048	case WRITE_VERIFY: /* SBC - VRProtect */
1049	case WRITE_VERIFY_12: /* SBC - VRProtect */
1050	case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1051	break;
1052	default:
1053	cdb[1] &= 0x1f; /* clear logical unit number */
1054	break;
1055	}
1056	}
1057
1058	static int pscsi_parse_cdb(struct se_cmd *cmd)
1059	{
1060	unsigned char *cdb = cmd->t_task_cdb;
1061	unsigned int dummy_size;
1062	int ret;
1063
1064	if (cmd->se_cmd_flags & SCF_BIDI) {
1065	cmd->se_cmd_flags \|= SCF_SCSI_CDB_EXCEPTION;
1066	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1067	return -EINVAL;
1068	}
1069
1070	pscsi_clear_cdb_lun(cdb);
1071
1072	/*
1073	* For REPORT LUNS we always need to emulate the response, for everything
1074	* else the default for pSCSI is to pass the command to the underlying
1075	* LLD / physical hardware.
1076	*/
1077	switch (cdb[0]) {
1078	case REPORT_LUNS:
1079	ret = spc_parse_cdb(cmd, &dummy_size);
1080	if (ret)
1081	return ret;
1082	break;
1083	case READ_6:
1084	case READ_10:
1085	case READ_12:
1086	case READ_16:
1087	case WRITE_6:
1088	case WRITE_10:
1089	case WRITE_12:
1090	case WRITE_16:
1091	case WRITE_VERIFY:
1092	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
1093	/* FALLTHROUGH*/
1094	default:
1095	cmd->execute_cmd = pscsi_execute_cmd;
1096	break;
1097	}
1098
1099	return 0;
1100	}
1101
1102	static int pscsi_execute_cmd(struct se_cmd *cmd)
1103	{
1104	struct scatterlist *sgl = cmd->t_data_sg;
1105	u32 sgl_nents = cmd->t_data_nents;
1106	enum dma_data_direction data_direction = cmd->data_direction;
1107	struct pscsi_dev_virt *pdv = cmd->se_dev->dev_ptr;
1108	struct pscsi_plugin_task *pt;
1109	struct request *req;
1110	struct bio *hbio;
1111	int ret;
1112
1113	/*
1114	* Dynamically alloc cdb space, since it may be larger than
1115	* TCM_MAX_COMMAND_SIZE
1116	*/
1117	pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
1118	if (!pt) {
1119	cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1120	return -ENOMEM;
1121	}
1122	cmd->priv = pt;
1123
1124	memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
1125	scsi_command_size(cmd->t_task_cdb));
1126
1127	if (!sgl) {
1128	req = blk_get_request(pdv->pdv_sd->request_queue,
1129	(data_direction == DMA_TO_DEVICE),
1130	GFP_KERNEL);
1131	if (!req \|\| IS_ERR(req)) {
1132	pr_err("PSCSI: blk_get_request() failed: %ld\n",
1133	req ? IS_ERR(req) : -ENOMEM);
1134	cmd->scsi_sense_reason =
1135	TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1136	goto fail;
1137	}
1138	} else {
1139	BUG_ON(!cmd->data_length);
1140
1141	ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
1142	if (ret < 0) {
1143	cmd->scsi_sense_reason =
1144	TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1145	goto fail;
1146	}
1147
1148	req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
1149	GFP_KERNEL);
1150	if (IS_ERR(req)) {
1151	pr_err("pSCSI: blk_make_request() failed\n");
1152	goto fail_free_bio;
1153	}
1154	}
1155
1156	req->cmd_type = REQ_TYPE_BLOCK_PC;
1157	req->end_io = pscsi_req_done;
1158	req->end_io_data = cmd;
1159	req->cmd_len = scsi_command_size(pt->pscsi_cdb);
1160	req->cmd = &pt->pscsi_cdb[0];
1161	req->sense = &pt->pscsi_sense[0];
1162	req->sense_len = 0;
1163	if (pdv->pdv_sd->type == TYPE_DISK)
1164	req->timeout = PS_TIMEOUT_DISK;
1165	else
1166	req->timeout = PS_TIMEOUT_OTHER;
1167	req->retries = PS_RETRY;
1168
1169	blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
1170	(cmd->sam_task_attr == MSG_HEAD_TAG),
1171	pscsi_req_done);
1172
1173	return 0;
1174
1175	fail_free_bio:
1176	while (hbio) {
1177	struct bio *bio = hbio;
1178	hbio = hbio->bi_next;
1179	bio->bi_next = NULL;
1180	bio_endio(bio, 0); /* XXX: should be error */
1181	}
1182	cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1183	fail:
1184	kfree(pt);
1185	return -ENOMEM;
1186	}
1187
1188	/* pscsi_get_device_rev():
1189	*
1190	*
1191	*/
1192	static u32 pscsi_get_device_rev(struct se_device *dev)
1193	{
1194	struct pscsi_dev_virt *pdv = dev->dev_ptr;
1195	struct scsi_device *sd = pdv->pdv_sd;
1196
1197	return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
1198	}
1199
1200	/* pscsi_get_device_type():
1201	*
1202	*
1203	*/
1204	static u32 pscsi_get_device_type(struct se_device *dev)
1205	{
1206	struct pscsi_dev_virt *pdv = dev->dev_ptr;
1207	struct scsi_device *sd = pdv->pdv_sd;
1208
1209	return sd->type;
1210	}
1211
1212	static sector_t pscsi_get_blocks(struct se_device *dev)
1213	{
1214	struct pscsi_dev_virt *pdv = dev->dev_ptr;
1215
1216	if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
1217	return pdv->pdv_bd->bd_part->nr_sects;
1218
1219	dump_stack();
1220	return 0;
1221	}
1222
1223	static void pscsi_req_done(struct request *req, int uptodate)
1224	{
1225	struct se_cmd *cmd = req->end_io_data;
1226	struct pscsi_plugin_task *pt = cmd->priv;
1227
1228	pt->pscsi_result = req->errors;
1229	pt->pscsi_resid = req->resid_len;
1230
1231	cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
1232	if (cmd->scsi_status) {
1233	pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
1234	" 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1235	pt->pscsi_result);
1236	}
1237
1238	switch (host_byte(pt->pscsi_result)) {
1239	case DID_OK:
1240	target_complete_cmd(cmd, cmd->scsi_status);
1241	break;
1242	default:
1243	pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
1244	" 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
1245	pt->pscsi_result);
1246	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1247	target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
1248	break;
1249	}
1250
1251	__blk_put_request(req->q, req);
1252	kfree(pt);
1253	}
1254
1255	static struct se_subsystem_api pscsi_template = {
1256	.name = "pscsi",
1257	.owner = THIS_MODULE,
1258	.transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
1259	.attach_hba = pscsi_attach_hba,
1260	.detach_hba = pscsi_detach_hba,
1261	.pmode_enable_hba = pscsi_pmode_enable_hba,
1262	.allocate_virtdevice = pscsi_allocate_virtdevice,
1263	.create_virtdevice = pscsi_create_virtdevice,
1264	.free_device = pscsi_free_device,
1265	.transport_complete = pscsi_transport_complete,
1266	.parse_cdb = pscsi_parse_cdb,
1267	.check_configfs_dev_params = pscsi_check_configfs_dev_params,
1268	.set_configfs_dev_params = pscsi_set_configfs_dev_params,
1269	.show_configfs_dev_params = pscsi_show_configfs_dev_params,
1270	.get_device_rev = pscsi_get_device_rev,
1271	.get_device_type = pscsi_get_device_type,
1272	.get_blocks = pscsi_get_blocks,
1273	};
1274
1275	static int __init pscsi_module_init(void)
1276	{
1277	return transport_subsystem_register(&pscsi_template);
1278	}
1279
1280	static void pscsi_module_exit(void)
1281	{
1282	transport_subsystem_release(&pscsi_template);
1283	}
1284
1285	MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
1286	MODULE_AUTHOR("nab@Linux-iSCSI.org");
1287	MODULE_LICENSE("GPL");
1288
1289	module_init(pscsi_module_init);
1290	module_exit(pscsi_module_exit);
1291

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