Commit | Line | Data |
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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 | ||
5951146d | 77 | hba->hba_ptr = ib_host; |
c66ac9db NB |
78 | |
79 | printk(KERN_INFO "CORE_HBA[%d] - TCM iBlock HBA Driver %s on" | |
80 | " Generic Target Core Stack %s\n", hba->hba_id, | |
81 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
82 | ||
e3d6f909 AG |
83 | printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic\n", |
84 | hba->hba_id, ib_host->iblock_host_id); | |
c66ac9db NB |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static void iblock_detach_hba(struct se_hba *hba) | |
90 | { | |
91 | struct iblock_hba *ib_host = hba->hba_ptr; | |
92 | ||
93 | printk(KERN_INFO "CORE_HBA[%d] - Detached iBlock HBA: %u from Generic" | |
94 | " Target Core\n", hba->hba_id, ib_host->iblock_host_id); | |
95 | ||
96 | kfree(ib_host); | |
97 | hba->hba_ptr = NULL; | |
98 | } | |
99 | ||
100 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) | |
101 | { | |
102 | struct iblock_dev *ib_dev = NULL; | |
103 | struct iblock_hba *ib_host = hba->hba_ptr; | |
104 | ||
105 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
106 | if (!(ib_dev)) { | |
107 | printk(KERN_ERR "Unable to allocate struct iblock_dev\n"); | |
108 | return NULL; | |
109 | } | |
110 | ib_dev->ibd_host = ib_host; | |
111 | ||
112 | printk(KERN_INFO "IBLOCK: Allocated ib_dev for %s\n", name); | |
113 | ||
114 | return ib_dev; | |
115 | } | |
116 | ||
117 | static struct se_device *iblock_create_virtdevice( | |
118 | struct se_hba *hba, | |
119 | struct se_subsystem_dev *se_dev, | |
120 | void *p) | |
121 | { | |
122 | struct iblock_dev *ib_dev = p; | |
123 | struct se_device *dev; | |
124 | struct se_dev_limits dev_limits; | |
125 | struct block_device *bd = NULL; | |
126 | struct request_queue *q; | |
127 | struct queue_limits *limits; | |
128 | u32 dev_flags = 0; | |
613640e4 | 129 | int ret = -EINVAL; |
c66ac9db NB |
130 | |
131 | if (!(ib_dev)) { | |
132 | printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n"); | |
613640e4 | 133 | return ERR_PTR(ret); |
c66ac9db NB |
134 | } |
135 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
136 | /* | |
137 | * These settings need to be made tunable.. | |
138 | */ | |
139 | ib_dev->ibd_bio_set = bioset_create(32, 64); | |
140 | if (!(ib_dev->ibd_bio_set)) { | |
141 | printk(KERN_ERR "IBLOCK: Unable to create bioset()\n"); | |
613640e4 | 142 | return ERR_PTR(-ENOMEM); |
c66ac9db NB |
143 | } |
144 | printk(KERN_INFO "IBLOCK: Created bio_set()\n"); | |
145 | /* | |
146 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path | |
147 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. | |
148 | */ | |
149 | printk(KERN_INFO "IBLOCK: Claiming struct block_device: %s\n", | |
150 | ib_dev->ibd_udev_path); | |
151 | ||
152 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, | |
153 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); | |
613640e4 NB |
154 | if (IS_ERR(bd)) { |
155 | ret = PTR_ERR(bd); | |
c66ac9db | 156 | goto failed; |
613640e4 | 157 | } |
c66ac9db NB |
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); | |
8f3d14e2 NB |
167 | dev_limits.hw_queue_depth = q->nr_requests; |
168 | dev_limits.queue_depth = q->nr_requests; | |
c66ac9db | 169 | |
c66ac9db NB |
170 | ib_dev->ibd_bd = bd; |
171 | ||
172 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 173 | &iblock_template, se_dev, dev_flags, ib_dev, |
c66ac9db NB |
174 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
175 | if (!(dev)) | |
176 | goto failed; | |
177 | ||
c66ac9db NB |
178 | /* |
179 | * Check if the underlying struct block_device request_queue supports | |
180 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
181 | * in ATA and we need to set TPE=1 | |
182 | */ | |
613640e4 | 183 | if (blk_queue_discard(q)) { |
e3d6f909 | 184 | dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
c66ac9db NB |
185 | q->limits.max_discard_sectors; |
186 | /* | |
187 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
188 | */ | |
e3d6f909 AG |
189 | dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; |
190 | dev->se_sub_dev->se_dev_attrib.unmap_granularity = | |
c66ac9db | 191 | q->limits.discard_granularity; |
e3d6f909 | 192 | dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
193 | q->limits.discard_alignment; |
194 | ||
195 | printk(KERN_INFO "IBLOCK: BLOCK Discard support available," | |
196 | " disabled by default\n"); | |
197 | } | |
198 | ||
199 | return dev; | |
200 | ||
201 | failed: | |
202 | if (ib_dev->ibd_bio_set) { | |
203 | bioset_free(ib_dev->ibd_bio_set); | |
204 | ib_dev->ibd_bio_set = NULL; | |
205 | } | |
206 | ib_dev->ibd_bd = NULL; | |
613640e4 | 207 | return ERR_PTR(ret); |
c66ac9db NB |
208 | } |
209 | ||
210 | static void iblock_free_device(void *p) | |
211 | { | |
212 | struct iblock_dev *ib_dev = p; | |
213 | ||
bc665524 NB |
214 | if (ib_dev->ibd_bd != NULL) |
215 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
216 | if (ib_dev->ibd_bio_set != NULL) | |
217 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
218 | kfree(ib_dev); |
219 | } | |
220 | ||
221 | static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) | |
222 | { | |
223 | return container_of(task, struct iblock_req, ib_task); | |
224 | } | |
225 | ||
226 | static struct se_task * | |
227 | iblock_alloc_task(struct se_cmd *cmd) | |
228 | { | |
229 | struct iblock_req *ib_req; | |
230 | ||
231 | ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
232 | if (!(ib_req)) { | |
233 | printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n"); | |
234 | return NULL; | |
235 | } | |
236 | ||
5951146d | 237 | ib_req->ib_dev = cmd->se_dev->dev_ptr; |
c66ac9db NB |
238 | atomic_set(&ib_req->ib_bio_cnt, 0); |
239 | return &ib_req->ib_task; | |
240 | } | |
241 | ||
242 | static unsigned long long iblock_emulate_read_cap_with_block_size( | |
243 | struct se_device *dev, | |
244 | struct block_device *bd, | |
245 | struct request_queue *q) | |
246 | { | |
247 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
248 | bdev_logical_block_size(bd)) - 1); | |
249 | u32 block_size = bdev_logical_block_size(bd); | |
250 | ||
e3d6f909 | 251 | if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
c66ac9db NB |
252 | return blocks_long; |
253 | ||
254 | switch (block_size) { | |
255 | case 4096: | |
e3d6f909 | 256 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
257 | case 2048: |
258 | blocks_long <<= 1; | |
259 | break; | |
260 | case 1024: | |
261 | blocks_long <<= 2; | |
262 | break; | |
263 | case 512: | |
264 | blocks_long <<= 3; | |
265 | default: | |
266 | break; | |
267 | } | |
268 | break; | |
269 | case 2048: | |
e3d6f909 | 270 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
271 | case 4096: |
272 | blocks_long >>= 1; | |
273 | break; | |
274 | case 1024: | |
275 | blocks_long <<= 1; | |
276 | break; | |
277 | case 512: | |
278 | blocks_long <<= 2; | |
279 | break; | |
280 | default: | |
281 | break; | |
282 | } | |
283 | break; | |
284 | case 1024: | |
e3d6f909 | 285 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
286 | case 4096: |
287 | blocks_long >>= 2; | |
288 | break; | |
289 | case 2048: | |
290 | blocks_long >>= 1; | |
291 | break; | |
292 | case 512: | |
293 | blocks_long <<= 1; | |
294 | break; | |
295 | default: | |
296 | break; | |
297 | } | |
298 | break; | |
299 | case 512: | |
e3d6f909 | 300 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
301 | case 4096: |
302 | blocks_long >>= 3; | |
303 | break; | |
304 | case 2048: | |
305 | blocks_long >>= 2; | |
306 | break; | |
307 | case 1024: | |
308 | blocks_long >>= 1; | |
309 | break; | |
310 | default: | |
311 | break; | |
312 | } | |
313 | break; | |
314 | default: | |
315 | break; | |
316 | } | |
317 | ||
318 | return blocks_long; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Emulate SYCHRONIZE_CACHE_* | |
323 | */ | |
324 | static void iblock_emulate_sync_cache(struct se_task *task) | |
325 | { | |
e3d6f909 | 326 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 327 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
a1d8b49a | 328 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
329 | sector_t error_sector; |
330 | int ret; | |
331 | ||
332 | /* | |
333 | * If the Immediate bit is set, queue up the GOOD response | |
334 | * for this SYNCHRONIZE_CACHE op | |
335 | */ | |
336 | if (immed) | |
337 | transport_complete_sync_cache(cmd, 1); | |
338 | ||
339 | /* | |
340 | * blkdev_issue_flush() does not support a specifying a range, so | |
341 | * we have to flush the entire cache. | |
342 | */ | |
343 | ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector); | |
344 | if (ret != 0) { | |
345 | printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d " | |
346 | " error_sector: %llu\n", ret, | |
347 | (unsigned long long)error_sector); | |
348 | } | |
349 | ||
350 | if (!immed) | |
351 | transport_complete_sync_cache(cmd, ret == 0); | |
352 | } | |
353 | ||
354 | /* | |
355 | * Tell TCM Core that we are capable of WriteCache emulation for | |
356 | * an underlying struct se_device. | |
357 | */ | |
358 | static int iblock_emulated_write_cache(struct se_device *dev) | |
359 | { | |
360 | return 1; | |
361 | } | |
362 | ||
363 | static int iblock_emulated_dpo(struct se_device *dev) | |
364 | { | |
365 | return 0; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs | |
370 | * for TYPE_DISK. | |
371 | */ | |
372 | static int iblock_emulated_fua_write(struct se_device *dev) | |
373 | { | |
374 | return 1; | |
375 | } | |
376 | ||
377 | static int iblock_emulated_fua_read(struct se_device *dev) | |
378 | { | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static int iblock_do_task(struct se_task *task) | |
383 | { | |
384 | struct se_device *dev = task->task_se_cmd->se_dev; | |
385 | struct iblock_req *req = IBLOCK_REQ(task); | |
c66ac9db | 386 | struct bio *bio = req->ib_bio, *nbio = NULL; |
7eaceacc | 387 | struct blk_plug plug; |
c66ac9db NB |
388 | int rw; |
389 | ||
390 | if (task->task_data_direction == DMA_TO_DEVICE) { | |
391 | /* | |
392 | * Force data to disk if we pretend to not have a volatile | |
393 | * write cache, or the initiator set the Force Unit Access bit. | |
394 | */ | |
e3d6f909 AG |
395 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || |
396 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
a1d8b49a | 397 | task->task_se_cmd->t_tasks_fua)) |
c66ac9db NB |
398 | rw = WRITE_FUA; |
399 | else | |
400 | rw = WRITE; | |
401 | } else { | |
402 | rw = READ; | |
403 | } | |
404 | ||
7eaceacc | 405 | blk_start_plug(&plug); |
c66ac9db NB |
406 | while (bio) { |
407 | nbio = bio->bi_next; | |
408 | bio->bi_next = NULL; | |
409 | DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p" | |
410 | " bio->bi_sector: %llu\n", task, bio, bio->bi_sector); | |
411 | ||
412 | submit_bio(rw, bio); | |
413 | bio = nbio; | |
414 | } | |
7eaceacc | 415 | blk_finish_plug(&plug); |
c66ac9db | 416 | |
c66ac9db NB |
417 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
418 | } | |
419 | ||
420 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) | |
421 | { | |
422 | struct iblock_dev *ibd = dev->dev_ptr; | |
423 | struct block_device *bd = ibd->ibd_bd; | |
424 | int barrier = 0; | |
425 | ||
426 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); | |
427 | } | |
428 | ||
429 | static void iblock_free_task(struct se_task *task) | |
430 | { | |
431 | struct iblock_req *req = IBLOCK_REQ(task); | |
432 | struct bio *bio, *hbio = req->ib_bio; | |
433 | /* | |
434 | * We only release the bio(s) here if iblock_bio_done() has not called | |
435 | * bio_put() -> iblock_bio_destructor(). | |
436 | */ | |
437 | while (hbio != NULL) { | |
438 | bio = hbio; | |
439 | hbio = hbio->bi_next; | |
440 | bio->bi_next = NULL; | |
441 | bio_put(bio); | |
442 | } | |
443 | ||
444 | kfree(req); | |
445 | } | |
446 | ||
447 | enum { | |
448 | Opt_udev_path, Opt_force, Opt_err | |
449 | }; | |
450 | ||
451 | static match_table_t tokens = { | |
452 | {Opt_udev_path, "udev_path=%s"}, | |
453 | {Opt_force, "force=%d"}, | |
454 | {Opt_err, NULL} | |
455 | }; | |
456 | ||
457 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, | |
458 | struct se_subsystem_dev *se_dev, | |
459 | const char *page, ssize_t count) | |
460 | { | |
461 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; | |
6d180253 | 462 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 463 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 464 | int ret = 0, token; |
c66ac9db NB |
465 | |
466 | opts = kstrdup(page, GFP_KERNEL); | |
467 | if (!opts) | |
468 | return -ENOMEM; | |
469 | ||
470 | orig = opts; | |
471 | ||
472 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
473 | if (!*ptr) | |
474 | continue; | |
475 | ||
476 | token = match_token(ptr, tokens, args); | |
477 | switch (token) { | |
478 | case Opt_udev_path: | |
479 | if (ib_dev->ibd_bd) { | |
480 | printk(KERN_ERR "Unable to set udev_path= while" | |
481 | " ib_dev->ibd_bd exists\n"); | |
482 | ret = -EEXIST; | |
483 | goto out; | |
484 | } | |
6d180253 JJ |
485 | arg_p = match_strdup(&args[0]); |
486 | if (!arg_p) { | |
487 | ret = -ENOMEM; | |
488 | break; | |
489 | } | |
490 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, | |
491 | "%s", arg_p); | |
492 | kfree(arg_p); | |
c66ac9db NB |
493 | printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n", |
494 | ib_dev->ibd_udev_path); | |
495 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
496 | break; | |
497 | case Opt_force: | |
c66ac9db NB |
498 | break; |
499 | default: | |
500 | break; | |
501 | } | |
502 | } | |
503 | ||
504 | out: | |
505 | kfree(orig); | |
506 | return (!ret) ? count : ret; | |
507 | } | |
508 | ||
509 | static ssize_t iblock_check_configfs_dev_params( | |
510 | struct se_hba *hba, | |
511 | struct se_subsystem_dev *se_dev) | |
512 | { | |
513 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
514 | ||
515 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { | |
516 | printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n"); | |
e3d6f909 | 517 | return -EINVAL; |
c66ac9db NB |
518 | } |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | static ssize_t iblock_show_configfs_dev_params( | |
524 | struct se_hba *hba, | |
525 | struct se_subsystem_dev *se_dev, | |
526 | char *b) | |
527 | { | |
528 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
529 | struct block_device *bd = ibd->ibd_bd; | |
530 | char buf[BDEVNAME_SIZE]; | |
531 | ssize_t bl = 0; | |
532 | ||
533 | if (bd) | |
534 | bl += sprintf(b + bl, "iBlock device: %s", | |
535 | bdevname(bd, buf)); | |
536 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { | |
537 | bl += sprintf(b + bl, " UDEV PATH: %s\n", | |
538 | ibd->ibd_udev_path); | |
539 | } else | |
540 | bl += sprintf(b + bl, "\n"); | |
541 | ||
542 | bl += sprintf(b + bl, " "); | |
543 | if (bd) { | |
544 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 545 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
c66ac9db NB |
546 | "" : (bd->bd_holder == (struct iblock_dev *)ibd) ? |
547 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); | |
548 | } else { | |
21bca31c | 549 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
550 | } |
551 | ||
552 | return bl; | |
553 | } | |
554 | ||
555 | static void iblock_bio_destructor(struct bio *bio) | |
556 | { | |
557 | struct se_task *task = bio->bi_private; | |
558 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; | |
559 | ||
560 | bio_free(bio, ib_dev->ibd_bio_set); | |
561 | } | |
562 | ||
563 | static struct bio *iblock_get_bio( | |
564 | struct se_task *task, | |
565 | struct iblock_req *ib_req, | |
566 | struct iblock_dev *ib_dev, | |
567 | int *ret, | |
568 | sector_t lba, | |
569 | u32 sg_num) | |
570 | { | |
571 | struct bio *bio; | |
572 | ||
573 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
574 | if (!(bio)) { | |
575 | printk(KERN_ERR "Unable to allocate memory for bio\n"); | |
576 | *ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; | |
577 | return NULL; | |
578 | } | |
579 | ||
580 | DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:" | |
581 | " %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set); | |
582 | DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size); | |
583 | ||
584 | bio->bi_bdev = ib_dev->ibd_bd; | |
5951146d | 585 | bio->bi_private = task; |
c66ac9db NB |
586 | bio->bi_destructor = iblock_bio_destructor; |
587 | bio->bi_end_io = &iblock_bio_done; | |
588 | bio->bi_sector = lba; | |
589 | atomic_inc(&ib_req->ib_bio_cnt); | |
590 | ||
591 | DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector); | |
592 | DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n", | |
593 | atomic_read(&ib_req->ib_bio_cnt)); | |
594 | return bio; | |
595 | } | |
596 | ||
597 | static int iblock_map_task_SG(struct se_task *task) | |
598 | { | |
599 | struct se_cmd *cmd = task->task_se_cmd; | |
5951146d | 600 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
601 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; |
602 | struct iblock_req *ib_req = IBLOCK_REQ(task); | |
603 | struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; | |
604 | struct scatterlist *sg; | |
605 | int ret = 0; | |
606 | u32 i, sg_num = task->task_sg_num; | |
607 | sector_t block_lba; | |
608 | /* | |
609 | * Do starting conversion up from non 512-byte blocksize with | |
610 | * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. | |
611 | */ | |
e3d6f909 | 612 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
c66ac9db | 613 | block_lba = (task->task_lba << 3); |
e3d6f909 | 614 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
c66ac9db | 615 | block_lba = (task->task_lba << 2); |
e3d6f909 | 616 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
c66ac9db | 617 | block_lba = (task->task_lba << 1); |
e3d6f909 | 618 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
c66ac9db NB |
619 | block_lba = task->task_lba; |
620 | else { | |
621 | printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:" | |
e3d6f909 | 622 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
623 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
624 | } | |
625 | ||
626 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num); | |
627 | if (!(bio)) | |
628 | return ret; | |
629 | ||
630 | ib_req->ib_bio = bio; | |
631 | hbio = tbio = bio; | |
632 | /* | |
633 | * Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist | |
634 | * from TCM struct se_mem -> task->task_sg -> struct scatterlist memory. | |
635 | */ | |
636 | for_each_sg(task->task_sg, sg, task->task_sg_num, i) { | |
637 | DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:" | |
638 | " %p len: %u offset: %u\n", task, bio, sg_page(sg), | |
639 | sg->length, sg->offset); | |
640 | again: | |
641 | ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset); | |
642 | if (ret != sg->length) { | |
643 | ||
644 | DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n", | |
645 | bio->bi_sector); | |
646 | DEBUG_IBLOCK("** task->task_size: %u\n", | |
647 | task->task_size); | |
648 | DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n", | |
649 | bio->bi_max_vecs); | |
650 | DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n", | |
651 | bio->bi_vcnt); | |
652 | ||
653 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, | |
654 | block_lba, sg_num); | |
655 | if (!(bio)) | |
656 | goto fail; | |
657 | ||
658 | tbio = tbio->bi_next = bio; | |
659 | DEBUG_IBLOCK("-----------------> Added +1 bio: %p to" | |
660 | " list, Going to again\n", bio); | |
661 | goto again; | |
662 | } | |
663 | /* Always in 512 byte units for Linux/Block */ | |
664 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
665 | sg_num--; | |
666 | DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented" | |
667 | " sg_num to %u\n", task, sg_num); | |
668 | DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba" | |
669 | " to %llu\n", task, block_lba); | |
670 | DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:" | |
671 | " %u\n", task, bio->bi_vcnt); | |
672 | } | |
673 | ||
674 | return 0; | |
675 | fail: | |
676 | while (hbio) { | |
677 | bio = hbio; | |
678 | hbio = hbio->bi_next; | |
679 | bio->bi_next = NULL; | |
680 | bio_put(bio); | |
681 | } | |
682 | return ret; | |
683 | } | |
684 | ||
685 | static unsigned char *iblock_get_cdb(struct se_task *task) | |
686 | { | |
687 | return IBLOCK_REQ(task)->ib_scsi_cdb; | |
688 | } | |
689 | ||
690 | static u32 iblock_get_device_rev(struct se_device *dev) | |
691 | { | |
692 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
693 | } | |
694 | ||
695 | static u32 iblock_get_device_type(struct se_device *dev) | |
696 | { | |
697 | return TYPE_DISK; | |
698 | } | |
699 | ||
700 | static sector_t iblock_get_blocks(struct se_device *dev) | |
701 | { | |
702 | struct iblock_dev *ibd = dev->dev_ptr; | |
703 | struct block_device *bd = ibd->ibd_bd; | |
704 | struct request_queue *q = bdev_get_queue(bd); | |
705 | ||
706 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
707 | } | |
708 | ||
709 | static void iblock_bio_done(struct bio *bio, int err) | |
710 | { | |
711 | struct se_task *task = bio->bi_private; | |
712 | struct iblock_req *ibr = IBLOCK_REQ(task); | |
713 | /* | |
714 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
715 | */ | |
716 | if (!(test_bit(BIO_UPTODATE, &bio->bi_flags)) && !(err)) | |
717 | err = -EIO; | |
718 | ||
719 | if (err != 0) { | |
720 | printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p," | |
721 | " err: %d\n", bio, err); | |
722 | /* | |
723 | * Bump the ib_bio_err_cnt and release bio. | |
724 | */ | |
725 | atomic_inc(&ibr->ib_bio_err_cnt); | |
726 | smp_mb__after_atomic_inc(); | |
727 | bio_put(bio); | |
728 | /* | |
729 | * Wait to complete the task until the last bio as completed. | |
730 | */ | |
731 | if (!(atomic_dec_and_test(&ibr->ib_bio_cnt))) | |
732 | return; | |
733 | ||
734 | ibr->ib_bio = NULL; | |
735 | transport_complete_task(task, 0); | |
736 | return; | |
737 | } | |
738 | DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", | |
739 | task, bio, task->task_lba, bio->bi_sector, err); | |
740 | /* | |
741 | * bio_put() will call iblock_bio_destructor() to release the bio back | |
742 | * to ibr->ib_bio_set. | |
743 | */ | |
744 | bio_put(bio); | |
745 | /* | |
746 | * Wait to complete the task until the last bio as completed. | |
747 | */ | |
748 | if (!(atomic_dec_and_test(&ibr->ib_bio_cnt))) | |
749 | return; | |
750 | /* | |
751 | * Return GOOD status for task if zero ib_bio_err_cnt exists. | |
752 | */ | |
753 | ibr->ib_bio = NULL; | |
754 | transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt))); | |
755 | } | |
756 | ||
757 | static struct se_subsystem_api iblock_template = { | |
758 | .name = "iblock", | |
759 | .owner = THIS_MODULE, | |
760 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
761 | .map_task_SG = iblock_map_task_SG, | |
762 | .attach_hba = iblock_attach_hba, | |
763 | .detach_hba = iblock_detach_hba, | |
764 | .allocate_virtdevice = iblock_allocate_virtdevice, | |
765 | .create_virtdevice = iblock_create_virtdevice, | |
766 | .free_device = iblock_free_device, | |
767 | .dpo_emulated = iblock_emulated_dpo, | |
768 | .fua_write_emulated = iblock_emulated_fua_write, | |
769 | .fua_read_emulated = iblock_emulated_fua_read, | |
770 | .write_cache_emulated = iblock_emulated_write_cache, | |
771 | .alloc_task = iblock_alloc_task, | |
772 | .do_task = iblock_do_task, | |
773 | .do_discard = iblock_do_discard, | |
774 | .do_sync_cache = iblock_emulate_sync_cache, | |
775 | .free_task = iblock_free_task, | |
776 | .check_configfs_dev_params = iblock_check_configfs_dev_params, | |
777 | .set_configfs_dev_params = iblock_set_configfs_dev_params, | |
778 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
779 | .get_cdb = iblock_get_cdb, | |
780 | .get_device_rev = iblock_get_device_rev, | |
781 | .get_device_type = iblock_get_device_type, | |
782 | .get_blocks = iblock_get_blocks, | |
783 | }; | |
784 | ||
785 | static int __init iblock_module_init(void) | |
786 | { | |
787 | return transport_subsystem_register(&iblock_template); | |
788 | } | |
789 | ||
790 | static void iblock_module_exit(void) | |
791 | { | |
792 | transport_subsystem_release(&iblock_template); | |
793 | } | |
794 | ||
795 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
796 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
797 | MODULE_LICENSE("GPL"); | |
798 | ||
799 | module_init(iblock_module_init); | |
800 | module_exit(iblock_module_exit); |