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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> | |
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 | ||
56 | static struct se_subsystem_api iblock_template; | |
57 | ||
58 | static void iblock_bio_done(struct bio *, int); | |
59 | ||
60 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) | |
61 | * | |
62 | * | |
63 | */ | |
64 | static 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 | ||
92 | static 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 | ||
103 | static 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 | ||
120 | static 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 | ||
207 | failed: | |
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 | ||
218 | static 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 | ||
229 | static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) | |
230 | { | |
231 | return container_of(task, struct iblock_req, ib_task); | |
232 | } | |
233 | ||
234 | static struct se_task * | |
235 | iblock_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 | ||
250 | static 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 | */ | |
332 | static 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 | */ | |
366 | static int iblock_emulated_write_cache(struct se_device *dev) | |
367 | { | |
368 | return 1; | |
369 | } | |
370 | ||
371 | static 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 | */ | |
380 | static int iblock_emulated_fua_write(struct se_device *dev) | |
381 | { | |
382 | return 1; | |
383 | } | |
384 | ||
385 | static int iblock_emulated_fua_read(struct se_device *dev) | |
386 | { | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static 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 | ||
429 | static 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 | ||
438 | static 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 | ||
456 | enum { | |
457 | Opt_udev_path, Opt_force, Opt_err | |
458 | }; | |
459 | ||
460 | static match_table_t tokens = { | |
461 | {Opt_udev_path, "udev_path=%s"}, | |
462 | {Opt_force, "force=%d"}, | |
463 | {Opt_err, NULL} | |
464 | }; | |
465 | ||
466 | static 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 | ||
517 | out: | |
518 | kfree(orig); | |
519 | return (!ret) ? count : ret; | |
520 | } | |
521 | ||
522 | static 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 | ||
536 | static 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 | ||
569 | static 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 | ||
577 | static 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 | ||
611 | static 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); | |
654 | again: | |
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; | |
689 | fail: | |
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 | ||
699 | static unsigned char *iblock_get_cdb(struct se_task *task) | |
700 | { | |
701 | return IBLOCK_REQ(task)->ib_scsi_cdb; | |
702 | } | |
703 | ||
704 | static u32 iblock_get_device_rev(struct se_device *dev) | |
705 | { | |
706 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
707 | } | |
708 | ||
709 | static u32 iblock_get_device_type(struct se_device *dev) | |
710 | { | |
711 | return TYPE_DISK; | |
712 | } | |
713 | ||
714 | static 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 | ||
723 | static 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 | ||
771 | static 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 | ||
799 | static int __init iblock_module_init(void) | |
800 | { | |
801 | return transport_subsystem_register(&iblock_template); | |
802 | } | |
803 | ||
804 | static void iblock_module_exit(void) | |
805 | { | |
806 | transport_subsystem_release(&iblock_template); | |
807 | } | |
808 | ||
809 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
810 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
811 | MODULE_LICENSE("GPL"); | |
812 | ||
813 | module_init(iblock_module_init); | |
814 | module_exit(iblock_module_exit); |