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[SCSI] target: remove EXTRA_CFLAGS
[deliverable/linux.git] / drivers / target / target_core_iblock.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_iblock.c
3 *
4 * This file contains the Storage Engine <-> Linux BlockIO transport
5 * specific functions.
6 *
7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
8 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
9 * Copyright (c) 2007-2010 Rising Tide Systems
10 * Copyright (c) 2008-2010 Linux-iSCSI.org
11 *
12 * Nicholas A. Bellinger <nab@kernel.org>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 *
28 ******************************************************************************/
29
30#include <linux/version.h>
31#include <linux/string.h>
32#include <linux/parser.h>
33#include <linux/timer.h>
34#include <linux/fs.h>
35#include <linux/blkdev.h>
36#include <linux/slab.h>
37#include <linux/spinlock.h>
c66ac9db
NB		 38#include <linux/bio.h>
39#include <linux/genhd.h>
40#include <linux/file.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_host.h>
43
44#include <target/target_core_base.h>
45#include <target/target_core_device.h>
46#include <target/target_core_transport.h>
47
48#include "target_core_iblock.h"
49
50#if 0
51#define DEBUG_IBLOCK(x...) printk(x)
52#else
53#define DEBUG_IBLOCK(x...)
54#endif
55
56static struct se_subsystem_api iblock_template;
57
58static void iblock_bio_done(struct bio *, int);
59
60/* iblock_attach_hba(): (Part of se_subsystem_api_t template)
61 *
62 *
63 */
64static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
65{
66 struct iblock_hba *ib_host;
67
68 ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL);
69 if (!(ib_host)) {
70 printk(KERN_ERR "Unable to allocate memory for"
71 " struct iblock_hba\n");
72 return -ENOMEM;
73 }
74
75 ib_host->iblock_host_id = host_id;
76
77 atomic_set(&hba->left_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
78 atomic_set(&hba->max_queue_depth, IBLOCK_HBA_QUEUE_DEPTH);
79 hba->hba_ptr = (void *) ib_host;
80
81 printk(KERN_INFO "CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
82 " Generic Target Core Stack %s\n", hba->hba_id,
83 IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
84
85 printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic"
86 " Target Core TCQ Depth: %d\n", hba->hba_id,
87 ib_host->iblock_host_id, atomic_read(&hba->max_queue_depth));
88
89 return 0;
90}
91
92static void iblock_detach_hba(struct se_hba *hba)
93{
94 struct iblock_hba *ib_host = hba->hba_ptr;
95
96 printk(KERN_INFO "CORE_HBA[%d] - Detached iBlock HBA: %u from Generic"
97 " Target Core\n", hba->hba_id, ib_host->iblock_host_id);
98
99 kfree(ib_host);
100 hba->hba_ptr = NULL;
101}
102
103static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name)
104{
105 struct iblock_dev *ib_dev = NULL;
106 struct iblock_hba *ib_host = hba->hba_ptr;
107
108 ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
109 if (!(ib_dev)) {
110 printk(KERN_ERR "Unable to allocate struct iblock_dev\n");
111 return NULL;
112 }
113 ib_dev->ibd_host = ib_host;
114
115 printk(KERN_INFO "IBLOCK: Allocated ib_dev for %s\n", name);
116
117 return ib_dev;
118}
119
120static struct se_device *iblock_create_virtdevice(
121 struct se_hba *hba,
122 struct se_subsystem_dev *se_dev,
123 void *p)
124{
125 struct iblock_dev *ib_dev = p;
126 struct se_device *dev;
127 struct se_dev_limits dev_limits;
128 struct block_device *bd = NULL;
129 struct request_queue *q;
130 struct queue_limits *limits;
131 u32 dev_flags = 0;
132
133 if (!(ib_dev)) {
134 printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n");
135 return 0;
136 }
137 memset(&dev_limits, 0, sizeof(struct se_dev_limits));
138 /*
139 * These settings need to be made tunable..
140 */
141 ib_dev->ibd_bio_set = bioset_create(32, 64);
142 if (!(ib_dev->ibd_bio_set)) {
143 printk(KERN_ERR "IBLOCK: Unable to create bioset()\n");
144 return 0;
145 }
146 printk(KERN_INFO "IBLOCK: Created bio_set()\n");
147 /*
148 * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path
149 * must already have been set in order for echo 1 > $HBA/$DEV/enable to run.
150 */
151 printk(KERN_INFO "IBLOCK: Claiming struct block_device: %s\n",
152 ib_dev->ibd_udev_path);
153
154 bd = blkdev_get_by_path(ib_dev->ibd_udev_path,
155 FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev);
3ae279d2 156 if (IS_ERR(bd))
c66ac9db
NB		 157 goto failed;
158 /*
159 * Setup the local scope queue_limits from struct request_queue->limits
160 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
161 */
162 q = bdev_get_queue(bd);
163 limits = &dev_limits.limits;
164 limits->logical_block_size = bdev_logical_block_size(bd);
165 limits->max_hw_sectors = queue_max_hw_sectors(q);
166 limits->max_sectors = queue_max_sectors(q);
167 dev_limits.hw_queue_depth = IBLOCK_MAX_DEVICE_QUEUE_DEPTH;
168 dev_limits.queue_depth = IBLOCK_DEVICE_QUEUE_DEPTH;
169
170 ib_dev->ibd_major = MAJOR(bd->bd_dev);
171 ib_dev->ibd_minor = MINOR(bd->bd_dev);
172 ib_dev->ibd_bd = bd;
173
174 dev = transport_add_device_to_core_hba(hba,
175 &iblock_template, se_dev, dev_flags, (void *)ib_dev,
176 &dev_limits, "IBLOCK", IBLOCK_VERSION);
177 if (!(dev))
178 goto failed;
179
180 ib_dev->ibd_depth = dev->queue_depth;
181
182 /*
183 * Check if the underlying struct block_device request_queue supports
184 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
185 * in ATA and we need to set TPE=1
186 */
187 if (blk_queue_discard(bdev_get_queue(bd))) {
188 struct request_queue *q = bdev_get_queue(bd);
189
190 DEV_ATTRIB(dev)->max_unmap_lba_count =
191 q->limits.max_discard_sectors;
192 /*
193 * Currently hardcoded to 1 in Linux/SCSI code..
194 */
195 DEV_ATTRIB(dev)->max_unmap_block_desc_count = 1;
196 DEV_ATTRIB(dev)->unmap_granularity =
197 q->limits.discard_granularity;
198 DEV_ATTRIB(dev)->unmap_granularity_alignment =
199 q->limits.discard_alignment;
200
201 printk(KERN_INFO "IBLOCK: BLOCK Discard support available,"
202 " disabled by default\n");
203 }
204
205 return dev;
206
207failed:
208 if (ib_dev->ibd_bio_set) {
209 bioset_free(ib_dev->ibd_bio_set);
210 ib_dev->ibd_bio_set = NULL;
211 }
212 ib_dev->ibd_bd = NULL;
213 ib_dev->ibd_major = 0;
214 ib_dev->ibd_minor = 0;
215 return NULL;
216}
217
218static void iblock_free_device(void *p)
219{
220 struct iblock_dev *ib_dev = p;
221
bc665524
NB		 222 if (ib_dev->ibd_bd != NULL)
223 blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
224 if (ib_dev->ibd_bio_set != NULL)
225 bioset_free(ib_dev->ibd_bio_set);
c66ac9db
NB		 226 kfree(ib_dev);
227}
228
229static inline struct iblock_req *IBLOCK_REQ(struct se_task *task)
230{
231 return container_of(task, struct iblock_req, ib_task);
232}
233
234static struct se_task *
235iblock_alloc_task(struct se_cmd *cmd)
236{
237 struct iblock_req *ib_req;
238
239 ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
240 if (!(ib_req)) {
241 printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n");
242 return NULL;
243 }
244
245 ib_req->ib_dev = SE_DEV(cmd)->dev_ptr;
246 atomic_set(&ib_req->ib_bio_cnt, 0);
247 return &ib_req->ib_task;
248}
249
250static unsigned long long iblock_emulate_read_cap_with_block_size(
251 struct se_device *dev,
252 struct block_device *bd,
253 struct request_queue *q)
254{
255 unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode),
256 bdev_logical_block_size(bd)) - 1);
257 u32 block_size = bdev_logical_block_size(bd);
258
259 if (block_size == DEV_ATTRIB(dev)->block_size)
260 return blocks_long;
261
262 switch (block_size) {
263 case 4096:
264 switch (DEV_ATTRIB(dev)->block_size) {
265 case 2048:
266 blocks_long <<= 1;
267 break;
268 case 1024:
269 blocks_long <<= 2;
270 break;
271 case 512:
272 blocks_long <<= 3;
273 default:
274 break;
275 }
276 break;
277 case 2048:
278 switch (DEV_ATTRIB(dev)->block_size) {
279 case 4096:
280 blocks_long >>= 1;
281 break;
282 case 1024:
283 blocks_long <<= 1;
284 break;
285 case 512:
286 blocks_long <<= 2;
287 break;
288 default:
289 break;
290 }
291 break;
292 case 1024:
293 switch (DEV_ATTRIB(dev)->block_size) {
294 case 4096:
295 blocks_long >>= 2;
296 break;
297 case 2048:
298 blocks_long >>= 1;
299 break;
300 case 512:
301 blocks_long <<= 1;
302 break;
303 default:
304 break;
305 }
306 break;
307 case 512:
308 switch (DEV_ATTRIB(dev)->block_size) {
309 case 4096:
310 blocks_long >>= 3;
311 break;
312 case 2048:
313 blocks_long >>= 2;
314 break;
315 case 1024:
316 blocks_long >>= 1;
317 break;
318 default:
319 break;
320 }
321 break;
322 default:
323 break;
324 }
325
326 return blocks_long;
327}
328
329/*
330 * Emulate SYCHRONIZE_CACHE_*
331 */
332static void iblock_emulate_sync_cache(struct se_task *task)
333{
334 struct se_cmd *cmd = TASK_CMD(task);
335 struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
336 int immed = (T_TASK(cmd)->t_task_cdb[1] & 0x2);
337 sector_t error_sector;
338 int ret;
339
340 /*
341 * If the Immediate bit is set, queue up the GOOD response
342 * for this SYNCHRONIZE_CACHE op
343 */
344 if (immed)
345 transport_complete_sync_cache(cmd, 1);
346
347 /*
348 * blkdev_issue_flush() does not support a specifying a range, so
349 * we have to flush the entire cache.
350 */
351 ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector);
352 if (ret != 0) {
353 printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d "
354 " error_sector: %llu\n", ret,
355 (unsigned long long)error_sector);
356 }
357
358 if (!immed)
359 transport_complete_sync_cache(cmd, ret == 0);
360}
361
362/*
363 * Tell TCM Core that we are capable of WriteCache emulation for
364 * an underlying struct se_device.
365 */
366static int iblock_emulated_write_cache(struct se_device *dev)
367{
368 return 1;
369}
370
371static int iblock_emulated_dpo(struct se_device *dev)
372{
373 return 0;
374}
375
376/*
377 * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs
378 * for TYPE_DISK.
379 */
380static int iblock_emulated_fua_write(struct se_device *dev)
381{
382 return 1;
383}
384
385static int iblock_emulated_fua_read(struct se_device *dev)
386{
387 return 0;
388}
389
390static int iblock_do_task(struct se_task *task)
391{
392 struct se_device *dev = task->task_se_cmd->se_dev;
393 struct iblock_req *req = IBLOCK_REQ(task);
394 struct iblock_dev *ibd = (struct iblock_dev *)req->ib_dev;
395 struct request_queue *q = bdev_get_queue(ibd->ibd_bd);
396 struct bio *bio = req->ib_bio, *nbio = NULL;
397 int rw;
398
399 if (task->task_data_direction == DMA_TO_DEVICE) {
400 /*
401 * Force data to disk if we pretend to not have a volatile
402 * write cache, or the initiator set the Force Unit Access bit.
403 */
404 if (DEV_ATTRIB(dev)->emulate_write_cache == 0 ||
405 (DEV_ATTRIB(dev)->emulate_fua_write > 0 &&
406 T_TASK(task->task_se_cmd)->t_tasks_fua))
407 rw = WRITE_FUA;
408 else
409 rw = WRITE;
410 } else {
411 rw = READ;
412 }
413
414 while (bio) {
415 nbio = bio->bi_next;
416 bio->bi_next = NULL;
417 DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p"
418 " bio->bi_sector: %llu\n", task, bio, bio->bi_sector);
419
420 submit_bio(rw, bio);
421 bio = nbio;
422 }
423
424 if (q->unplug_fn)
425 q->unplug_fn(q);
426 return PYX_TRANSPORT_SENT_TO_TRANSPORT;
427}
428
429static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range)
430{
431 struct iblock_dev *ibd = dev->dev_ptr;
432 struct block_device *bd = ibd->ibd_bd;
433 int barrier = 0;
434
435 return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier);
436}
437
438static void iblock_free_task(struct se_task *task)
439{
440 struct iblock_req *req = IBLOCK_REQ(task);
441 struct bio *bio, *hbio = req->ib_bio;
442 /*
443 * We only release the bio(s) here if iblock_bio_done() has not called
444 * bio_put() -> iblock_bio_destructor().
445 */
446 while (hbio != NULL) {
447 bio = hbio;
448 hbio = hbio->bi_next;
449 bio->bi_next = NULL;
450 bio_put(bio);
451 }
452
453 kfree(req);
454}
455
456enum {
457 Opt_udev_path, Opt_force, Opt_err
458};
459
460static match_table_t tokens = {
461 {Opt_udev_path, "udev_path=%s"},
462 {Opt_force, "force=%d"},
463 {Opt_err, NULL}
464};
465
466static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
467 struct se_subsystem_dev *se_dev,
468 const char *page, ssize_t count)
469{
470 struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr;
6d180253 471 char *orig, *ptr, *arg_p, *opts;
c66ac9db
NB		 472 substring_t args[MAX_OPT_ARGS];
473 int ret = 0, arg, token;
474
475 opts = kstrdup(page, GFP_KERNEL);
476 if (!opts)
477 return -ENOMEM;
478
479 orig = opts;
480
481 while ((ptr = strsep(&opts, ",")) != NULL) {
482 if (!*ptr)
483 continue;
484
485 token = match_token(ptr, tokens, args);
486 switch (token) {
487 case Opt_udev_path:
488 if (ib_dev->ibd_bd) {
489 printk(KERN_ERR "Unable to set udev_path= while"
490 " ib_dev->ibd_bd exists\n");
491 ret = -EEXIST;
492 goto out;
493 }
6d180253
JJ		 494 arg_p = match_strdup(&args[0]);
495 if (!arg_p) {
496 ret = -ENOMEM;
497 break;
498 }
499 snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
500 "%s", arg_p);
501 kfree(arg_p);
c66ac9db
NB		 502 printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n",
503 ib_dev->ibd_udev_path);
504 ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
505 break;
506 case Opt_force:
507 match_int(args, &arg);
508 ib_dev->ibd_force = arg;
509 printk(KERN_INFO "IBLOCK: Set force=%d\n",
510 ib_dev->ibd_force);
511 break;
512 default:
513 break;
514 }
515 }
516
517out:
518 kfree(orig);
519 return (!ret) ? count : ret;
520}
521
522static ssize_t iblock_check_configfs_dev_params(
523 struct se_hba *hba,
524 struct se_subsystem_dev *se_dev)
525{
526 struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
527
528 if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
529 printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n");
530 return -1;
531 }
532
533 return 0;
534}
535
536static ssize_t iblock_show_configfs_dev_params(
537 struct se_hba *hba,
538 struct se_subsystem_dev *se_dev,
539 char *b)
540{
541 struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
542 struct block_device *bd = ibd->ibd_bd;
543 char buf[BDEVNAME_SIZE];
544 ssize_t bl = 0;
545
546 if (bd)
547 bl += sprintf(b + bl, "iBlock device: %s",
548 bdevname(bd, buf));
549 if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) {
550 bl += sprintf(b + bl, " UDEV PATH: %s\n",
551 ibd->ibd_udev_path);
552 } else
553 bl += sprintf(b + bl, "\n");
554
555 bl += sprintf(b + bl, " ");
556 if (bd) {
557 bl += sprintf(b + bl, "Major: %d Minor: %d %s\n",
558 ibd->ibd_major, ibd->ibd_minor, (!bd->bd_contains) ?
559 "" : (bd->bd_holder == (struct iblock_dev *)ibd) ?
560 "CLAIMED: IBLOCK" : "CLAIMED: OS");
561 } else {
562 bl += sprintf(b + bl, "Major: %d Minor: %d\n",
563 ibd->ibd_major, ibd->ibd_minor);
564 }
565
566 return bl;
567}
568
569static void iblock_bio_destructor(struct bio *bio)
570{
571 struct se_task *task = bio->bi_private;
572 struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
573
574 bio_free(bio, ib_dev->ibd_bio_set);
575}
576
577static struct bio *iblock_get_bio(
578 struct se_task *task,
579 struct iblock_req *ib_req,
580 struct iblock_dev *ib_dev,
581 int *ret,
582 sector_t lba,
583 u32 sg_num)
584{
585 struct bio *bio;
586
587 bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
588 if (!(bio)) {
589 printk(KERN_ERR "Unable to allocate memory for bio\n");
590 *ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
591 return NULL;
592 }
593
594 DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:"
595 " %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set);
596 DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size);
597
598 bio->bi_bdev = ib_dev->ibd_bd;
599 bio->bi_private = (void *) task;
600 bio->bi_destructor = iblock_bio_destructor;
601 bio->bi_end_io = &iblock_bio_done;
602 bio->bi_sector = lba;
603 atomic_inc(&ib_req->ib_bio_cnt);
604
605 DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector);
606 DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n",
607 atomic_read(&ib_req->ib_bio_cnt));
608 return bio;
609}
610
611static int iblock_map_task_SG(struct se_task *task)
612{
613 struct se_cmd *cmd = task->task_se_cmd;
614 struct se_device *dev = SE_DEV(cmd);
615 struct iblock_dev *ib_dev = task->se_dev->dev_ptr;
616 struct iblock_req *ib_req = IBLOCK_REQ(task);
617 struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
618 struct scatterlist *sg;
619 int ret = 0;
620 u32 i, sg_num = task->task_sg_num;
621 sector_t block_lba;
622 /*
623 * Do starting conversion up from non 512-byte blocksize with
624 * struct se_task SCSI blocksize into Linux/Block 512 units for BIO.
625 */
626 if (DEV_ATTRIB(dev)->block_size == 4096)
627 block_lba = (task->task_lba << 3);
628 else if (DEV_ATTRIB(dev)->block_size == 2048)
629 block_lba = (task->task_lba << 2);
630 else if (DEV_ATTRIB(dev)->block_size == 1024)
631 block_lba = (task->task_lba << 1);
632 else if (DEV_ATTRIB(dev)->block_size == 512)
633 block_lba = task->task_lba;
634 else {
635 printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:"
636 " %u\n", DEV_ATTRIB(dev)->block_size);
637 return PYX_TRANSPORT_LU_COMM_FAILURE;
638 }
639
640 bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num);
641 if (!(bio))
642 return ret;
643
644 ib_req->ib_bio = bio;
645 hbio = tbio = bio;
646 /*
647 * Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist
648 * from TCM struct se_mem -> task->task_sg -> struct scatterlist memory.
649 */
650 for_each_sg(task->task_sg, sg, task->task_sg_num, i) {
651 DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:"
652 " %p len: %u offset: %u\n", task, bio, sg_page(sg),
653 sg->length, sg->offset);
654again:
655 ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset);
656 if (ret != sg->length) {
657
658 DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n",
659 bio->bi_sector);
660 DEBUG_IBLOCK("** task->task_size: %u\n",
661 task->task_size);
662 DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n",
663 bio->bi_max_vecs);
664 DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n",
665 bio->bi_vcnt);
666
667 bio = iblock_get_bio(task, ib_req, ib_dev, &ret,
668 block_lba, sg_num);
669 if (!(bio))
670 goto fail;
671
672 tbio = tbio->bi_next = bio;
673 DEBUG_IBLOCK("-----------------> Added +1 bio: %p to"
674 " list, Going to again\n", bio);
675 goto again;
676 }
677 /* Always in 512 byte units for Linux/Block */
678 block_lba += sg->length >> IBLOCK_LBA_SHIFT;
679 sg_num--;
680 DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented"
681 " sg_num to %u\n", task, sg_num);
682 DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba"
683 " to %llu\n", task, block_lba);
684 DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:"
685 " %u\n", task, bio->bi_vcnt);
686 }
687
688 return 0;
689fail:
690 while (hbio) {
691 bio = hbio;
692 hbio = hbio->bi_next;
693 bio->bi_next = NULL;
694 bio_put(bio);
695 }
696 return ret;
697}
698
699static unsigned char *iblock_get_cdb(struct se_task *task)
700{
701 return IBLOCK_REQ(task)->ib_scsi_cdb;
702}
703
704static u32 iblock_get_device_rev(struct se_device *dev)
705{
706 return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
707}
708
709static u32 iblock_get_device_type(struct se_device *dev)
710{
711 return TYPE_DISK;
712}
713
714static sector_t iblock_get_blocks(struct se_device *dev)
715{
716 struct iblock_dev *ibd = dev->dev_ptr;
717 struct block_device *bd = ibd->ibd_bd;
718 struct request_queue *q = bdev_get_queue(bd);
719
720 return iblock_emulate_read_cap_with_block_size(dev, bd, q);
721}
722
723static void iblock_bio_done(struct bio *bio, int err)
724{
725 struct se_task *task = bio->bi_private;
726 struct iblock_req *ibr = IBLOCK_REQ(task);
727 /*
728 * Set -EIO if !BIO_UPTODATE and the passed is still err=0
729 */
730 if (!(test_bit(BIO_UPTODATE, &bio->bi_flags)) && !(err))
731 err = -EIO;
732
733 if (err != 0) {
734 printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p,"
735 " err: %d\n", bio, err);
736 /*
737 * Bump the ib_bio_err_cnt and release bio.
738 */
739 atomic_inc(&ibr->ib_bio_err_cnt);
740 smp_mb__after_atomic_inc();
741 bio_put(bio);
742 /*
743 * Wait to complete the task until the last bio as completed.
744 */
745 if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
746 return;
747
748 ibr->ib_bio = NULL;
749 transport_complete_task(task, 0);
750 return;
751 }
752 DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
753 task, bio, task->task_lba, bio->bi_sector, err);
754 /*
755 * bio_put() will call iblock_bio_destructor() to release the bio back
756 * to ibr->ib_bio_set.
757 */
758 bio_put(bio);
759 /*
760 * Wait to complete the task until the last bio as completed.
761 */
762 if (!(atomic_dec_and_test(&ibr->ib_bio_cnt)))
763 return;
764 /*
765 * Return GOOD status for task if zero ib_bio_err_cnt exists.
766 */
767 ibr->ib_bio = NULL;
768 transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt)));
769}
770
771static struct se_subsystem_api iblock_template = {
772 .name = "iblock",
773 .owner = THIS_MODULE,
774 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
775 .map_task_SG = iblock_map_task_SG,
776 .attach_hba = iblock_attach_hba,
777 .detach_hba = iblock_detach_hba,
778 .allocate_virtdevice = iblock_allocate_virtdevice,
779 .create_virtdevice = iblock_create_virtdevice,
780 .free_device = iblock_free_device,
781 .dpo_emulated = iblock_emulated_dpo,
782 .fua_write_emulated = iblock_emulated_fua_write,
783 .fua_read_emulated = iblock_emulated_fua_read,
784 .write_cache_emulated = iblock_emulated_write_cache,
785 .alloc_task = iblock_alloc_task,
786 .do_task = iblock_do_task,
787 .do_discard = iblock_do_discard,
788 .do_sync_cache = iblock_emulate_sync_cache,
789 .free_task = iblock_free_task,
790 .check_configfs_dev_params = iblock_check_configfs_dev_params,
791 .set_configfs_dev_params = iblock_set_configfs_dev_params,
792 .show_configfs_dev_params = iblock_show_configfs_dev_params,
793 .get_cdb = iblock_get_cdb,
794 .get_device_rev = iblock_get_device_rev,
795 .get_device_type = iblock_get_device_type,
796 .get_blocks = iblock_get_blocks,
797};
798
799static int __init iblock_module_init(void)
800{
801 return transport_subsystem_register(&iblock_template);
802}
803
804static void iblock_module_exit(void)
805{
806 transport_subsystem_release(&iblock_template);
807}
808
809MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin");
810MODULE_AUTHOR("nab@Linux-iSCSI.org");
811MODULE_LICENSE("GPL");
812
813module_init(iblock_module_init);
814module_exit(iblock_module_exit);
Linux kernel - Deliverables
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