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