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 | ||
c66ac9db NB |
30 | #include <linux/string.h> |
31 | #include <linux/parser.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/fs.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/spinlock.h> | |
c66ac9db NB |
37 | #include <linux/bio.h> |
38 | #include <linux/genhd.h> | |
39 | #include <linux/file.h> | |
40 | #include <scsi/scsi.h> | |
41 | #include <scsi/scsi_host.h> | |
42 | ||
43 | #include <target/target_core_base.h> | |
44 | #include <target/target_core_device.h> | |
45 | #include <target/target_core_transport.h> | |
46 | ||
47 | #include "target_core_iblock.h" | |
48 | ||
c66ac9db NB |
49 | static struct se_subsystem_api iblock_template; |
50 | ||
51 | static void iblock_bio_done(struct bio *, int); | |
52 | ||
53 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) | |
54 | * | |
55 | * | |
56 | */ | |
57 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
58 | { | |
59 | struct iblock_hba *ib_host; | |
60 | ||
61 | ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL); | |
6708bb27 AG |
62 | if (!ib_host) { |
63 | pr_err("Unable to allocate memory for" | |
c66ac9db NB |
64 | " struct iblock_hba\n"); |
65 | return -ENOMEM; | |
66 | } | |
67 | ||
68 | ib_host->iblock_host_id = host_id; | |
69 | ||
5951146d | 70 | hba->hba_ptr = ib_host; |
c66ac9db | 71 | |
6708bb27 | 72 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
73 | " Generic Target Core Stack %s\n", hba->hba_id, |
74 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
75 | ||
6708bb27 | 76 | pr_debug("CORE_HBA[%d] - Attached iBlock HBA: %u to Generic\n", |
e3d6f909 | 77 | hba->hba_id, ib_host->iblock_host_id); |
c66ac9db NB |
78 | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static void iblock_detach_hba(struct se_hba *hba) | |
83 | { | |
84 | struct iblock_hba *ib_host = hba->hba_ptr; | |
85 | ||
6708bb27 | 86 | pr_debug("CORE_HBA[%d] - Detached iBlock HBA: %u from Generic" |
c66ac9db NB |
87 | " Target Core\n", hba->hba_id, ib_host->iblock_host_id); |
88 | ||
89 | kfree(ib_host); | |
90 | hba->hba_ptr = NULL; | |
91 | } | |
92 | ||
93 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) | |
94 | { | |
95 | struct iblock_dev *ib_dev = NULL; | |
96 | struct iblock_hba *ib_host = hba->hba_ptr; | |
97 | ||
98 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
99 | if (!ib_dev) { |
100 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
101 | return NULL; |
102 | } | |
103 | ib_dev->ibd_host = ib_host; | |
104 | ||
6708bb27 | 105 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db NB |
106 | |
107 | return ib_dev; | |
108 | } | |
109 | ||
110 | static struct se_device *iblock_create_virtdevice( | |
111 | struct se_hba *hba, | |
112 | struct se_subsystem_dev *se_dev, | |
113 | void *p) | |
114 | { | |
115 | struct iblock_dev *ib_dev = p; | |
116 | struct se_device *dev; | |
117 | struct se_dev_limits dev_limits; | |
118 | struct block_device *bd = NULL; | |
119 | struct request_queue *q; | |
120 | struct queue_limits *limits; | |
121 | u32 dev_flags = 0; | |
613640e4 | 122 | int ret = -EINVAL; |
c66ac9db | 123 | |
6708bb27 AG |
124 | if (!ib_dev) { |
125 | pr_err("Unable to locate struct iblock_dev parameter\n"); | |
613640e4 | 126 | return ERR_PTR(ret); |
c66ac9db NB |
127 | } |
128 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
129 | /* | |
130 | * These settings need to be made tunable.. | |
131 | */ | |
132 | ib_dev->ibd_bio_set = bioset_create(32, 64); | |
6708bb27 AG |
133 | if (!ib_dev->ibd_bio_set) { |
134 | pr_err("IBLOCK: Unable to create bioset()\n"); | |
613640e4 | 135 | return ERR_PTR(-ENOMEM); |
c66ac9db | 136 | } |
6708bb27 | 137 | pr_debug("IBLOCK: Created bio_set()\n"); |
c66ac9db NB |
138 | /* |
139 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path | |
140 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. | |
141 | */ | |
6708bb27 | 142 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
143 | ib_dev->ibd_udev_path); |
144 | ||
145 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, | |
146 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); | |
613640e4 NB |
147 | if (IS_ERR(bd)) { |
148 | ret = PTR_ERR(bd); | |
c66ac9db | 149 | goto failed; |
613640e4 | 150 | } |
c66ac9db NB |
151 | /* |
152 | * Setup the local scope queue_limits from struct request_queue->limits | |
153 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
154 | */ | |
155 | q = bdev_get_queue(bd); | |
156 | limits = &dev_limits.limits; | |
157 | limits->logical_block_size = bdev_logical_block_size(bd); | |
158 | limits->max_hw_sectors = queue_max_hw_sectors(q); | |
159 | limits->max_sectors = queue_max_sectors(q); | |
8f3d14e2 NB |
160 | dev_limits.hw_queue_depth = q->nr_requests; |
161 | dev_limits.queue_depth = q->nr_requests; | |
c66ac9db | 162 | |
c66ac9db NB |
163 | ib_dev->ibd_bd = bd; |
164 | ||
165 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 166 | &iblock_template, se_dev, dev_flags, ib_dev, |
c66ac9db | 167 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
6708bb27 | 168 | if (!dev) |
c66ac9db NB |
169 | goto failed; |
170 | ||
c66ac9db NB |
171 | /* |
172 | * Check if the underlying struct block_device request_queue supports | |
173 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
174 | * in ATA and we need to set TPE=1 | |
175 | */ | |
613640e4 | 176 | if (blk_queue_discard(q)) { |
e3d6f909 | 177 | dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
c66ac9db NB |
178 | q->limits.max_discard_sectors; |
179 | /* | |
180 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
181 | */ | |
e3d6f909 AG |
182 | dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; |
183 | dev->se_sub_dev->se_dev_attrib.unmap_granularity = | |
c66ac9db | 184 | q->limits.discard_granularity; |
e3d6f909 | 185 | dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
186 | q->limits.discard_alignment; |
187 | ||
6708bb27 | 188 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
189 | " disabled by default\n"); |
190 | } | |
191 | ||
e22a7f07 RD |
192 | if (blk_queue_nonrot(q)) |
193 | dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; | |
194 | ||
c66ac9db NB |
195 | return dev; |
196 | ||
197 | failed: | |
198 | if (ib_dev->ibd_bio_set) { | |
199 | bioset_free(ib_dev->ibd_bio_set); | |
200 | ib_dev->ibd_bio_set = NULL; | |
201 | } | |
202 | ib_dev->ibd_bd = NULL; | |
613640e4 | 203 | return ERR_PTR(ret); |
c66ac9db NB |
204 | } |
205 | ||
206 | static void iblock_free_device(void *p) | |
207 | { | |
208 | struct iblock_dev *ib_dev = p; | |
209 | ||
bc665524 NB |
210 | if (ib_dev->ibd_bd != NULL) |
211 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
212 | if (ib_dev->ibd_bio_set != NULL) | |
213 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
214 | kfree(ib_dev); |
215 | } | |
216 | ||
217 | static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) | |
218 | { | |
219 | return container_of(task, struct iblock_req, ib_task); | |
220 | } | |
221 | ||
222 | static struct se_task * | |
6708bb27 | 223 | iblock_alloc_task(unsigned char *cdb) |
c66ac9db NB |
224 | { |
225 | struct iblock_req *ib_req; | |
226 | ||
227 | ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
6708bb27 AG |
228 | if (!ib_req) { |
229 | pr_err("Unable to allocate memory for struct iblock_req\n"); | |
c66ac9db NB |
230 | return NULL; |
231 | } | |
232 | ||
c66ac9db NB |
233 | atomic_set(&ib_req->ib_bio_cnt, 0); |
234 | return &ib_req->ib_task; | |
235 | } | |
236 | ||
237 | static unsigned long long iblock_emulate_read_cap_with_block_size( | |
238 | struct se_device *dev, | |
239 | struct block_device *bd, | |
240 | struct request_queue *q) | |
241 | { | |
242 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
243 | bdev_logical_block_size(bd)) - 1); | |
244 | u32 block_size = bdev_logical_block_size(bd); | |
245 | ||
e3d6f909 | 246 | if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
c66ac9db NB |
247 | return blocks_long; |
248 | ||
249 | switch (block_size) { | |
250 | case 4096: | |
e3d6f909 | 251 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
252 | case 2048: |
253 | blocks_long <<= 1; | |
254 | break; | |
255 | case 1024: | |
256 | blocks_long <<= 2; | |
257 | break; | |
258 | case 512: | |
259 | blocks_long <<= 3; | |
260 | default: | |
261 | break; | |
262 | } | |
263 | break; | |
264 | case 2048: | |
e3d6f909 | 265 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
266 | case 4096: |
267 | blocks_long >>= 1; | |
268 | break; | |
269 | case 1024: | |
270 | blocks_long <<= 1; | |
271 | break; | |
272 | case 512: | |
273 | blocks_long <<= 2; | |
274 | break; | |
275 | default: | |
276 | break; | |
277 | } | |
278 | break; | |
279 | case 1024: | |
e3d6f909 | 280 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
281 | case 4096: |
282 | blocks_long >>= 2; | |
283 | break; | |
284 | case 2048: | |
285 | blocks_long >>= 1; | |
286 | break; | |
287 | case 512: | |
288 | blocks_long <<= 1; | |
289 | break; | |
290 | default: | |
291 | break; | |
292 | } | |
293 | break; | |
294 | case 512: | |
e3d6f909 | 295 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
296 | case 4096: |
297 | blocks_long >>= 3; | |
298 | break; | |
299 | case 2048: | |
300 | blocks_long >>= 2; | |
301 | break; | |
302 | case 1024: | |
303 | blocks_long >>= 1; | |
304 | break; | |
305 | default: | |
306 | break; | |
307 | } | |
308 | break; | |
309 | default: | |
310 | break; | |
311 | } | |
312 | ||
313 | return blocks_long; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Emulate SYCHRONIZE_CACHE_* | |
318 | */ | |
319 | static void iblock_emulate_sync_cache(struct se_task *task) | |
320 | { | |
e3d6f909 | 321 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 322 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
a1d8b49a | 323 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
324 | sector_t error_sector; |
325 | int ret; | |
326 | ||
327 | /* | |
328 | * If the Immediate bit is set, queue up the GOOD response | |
329 | * for this SYNCHRONIZE_CACHE op | |
330 | */ | |
331 | if (immed) | |
332 | transport_complete_sync_cache(cmd, 1); | |
333 | ||
334 | /* | |
335 | * blkdev_issue_flush() does not support a specifying a range, so | |
336 | * we have to flush the entire cache. | |
337 | */ | |
338 | ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector); | |
339 | if (ret != 0) { | |
6708bb27 | 340 | pr_err("IBLOCK: block_issue_flush() failed: %d " |
c66ac9db NB |
341 | " error_sector: %llu\n", ret, |
342 | (unsigned long long)error_sector); | |
343 | } | |
344 | ||
345 | if (!immed) | |
346 | transport_complete_sync_cache(cmd, ret == 0); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Tell TCM Core that we are capable of WriteCache emulation for | |
351 | * an underlying struct se_device. | |
352 | */ | |
353 | static int iblock_emulated_write_cache(struct se_device *dev) | |
354 | { | |
355 | return 1; | |
356 | } | |
357 | ||
358 | static int iblock_emulated_dpo(struct se_device *dev) | |
359 | { | |
360 | return 0; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs | |
365 | * for TYPE_DISK. | |
366 | */ | |
367 | static int iblock_emulated_fua_write(struct se_device *dev) | |
368 | { | |
369 | return 1; | |
370 | } | |
371 | ||
372 | static int iblock_emulated_fua_read(struct se_device *dev) | |
373 | { | |
374 | return 0; | |
375 | } | |
376 | ||
377 | static int iblock_do_task(struct se_task *task) | |
378 | { | |
379 | struct se_device *dev = task->task_se_cmd->se_dev; | |
380 | struct iblock_req *req = IBLOCK_REQ(task); | |
c66ac9db | 381 | struct bio *bio = req->ib_bio, *nbio = NULL; |
7eaceacc | 382 | struct blk_plug plug; |
c66ac9db NB |
383 | int rw; |
384 | ||
385 | if (task->task_data_direction == DMA_TO_DEVICE) { | |
386 | /* | |
387 | * Force data to disk if we pretend to not have a volatile | |
388 | * write cache, or the initiator set the Force Unit Access bit. | |
389 | */ | |
e3d6f909 AG |
390 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || |
391 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
a1d8b49a | 392 | task->task_se_cmd->t_tasks_fua)) |
c66ac9db NB |
393 | rw = WRITE_FUA; |
394 | else | |
395 | rw = WRITE; | |
396 | } else { | |
397 | rw = READ; | |
398 | } | |
399 | ||
7eaceacc | 400 | blk_start_plug(&plug); |
c66ac9db NB |
401 | while (bio) { |
402 | nbio = bio->bi_next; | |
403 | bio->bi_next = NULL; | |
6708bb27 AG |
404 | pr_debug("Calling submit_bio() task: %p bio: %p" |
405 | " bio->bi_sector: %llu\n", task, bio, | |
406 | (unsigned long long)bio->bi_sector); | |
c66ac9db NB |
407 | |
408 | submit_bio(rw, bio); | |
409 | bio = nbio; | |
410 | } | |
7eaceacc | 411 | blk_finish_plug(&plug); |
c66ac9db | 412 | |
c66ac9db NB |
413 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
414 | } | |
415 | ||
416 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) | |
417 | { | |
418 | struct iblock_dev *ibd = dev->dev_ptr; | |
419 | struct block_device *bd = ibd->ibd_bd; | |
420 | int barrier = 0; | |
421 | ||
422 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); | |
423 | } | |
424 | ||
425 | static void iblock_free_task(struct se_task *task) | |
426 | { | |
427 | struct iblock_req *req = IBLOCK_REQ(task); | |
428 | struct bio *bio, *hbio = req->ib_bio; | |
429 | /* | |
430 | * We only release the bio(s) here if iblock_bio_done() has not called | |
431 | * bio_put() -> iblock_bio_destructor(). | |
432 | */ | |
433 | while (hbio != NULL) { | |
434 | bio = hbio; | |
435 | hbio = hbio->bi_next; | |
436 | bio->bi_next = NULL; | |
437 | bio_put(bio); | |
438 | } | |
439 | ||
440 | kfree(req); | |
441 | } | |
442 | ||
443 | enum { | |
444 | Opt_udev_path, Opt_force, Opt_err | |
445 | }; | |
446 | ||
447 | static match_table_t tokens = { | |
448 | {Opt_udev_path, "udev_path=%s"}, | |
449 | {Opt_force, "force=%d"}, | |
450 | {Opt_err, NULL} | |
451 | }; | |
452 | ||
453 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, | |
454 | struct se_subsystem_dev *se_dev, | |
455 | const char *page, ssize_t count) | |
456 | { | |
457 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; | |
6d180253 | 458 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 459 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 460 | int ret = 0, token; |
c66ac9db NB |
461 | |
462 | opts = kstrdup(page, GFP_KERNEL); | |
463 | if (!opts) | |
464 | return -ENOMEM; | |
465 | ||
466 | orig = opts; | |
467 | ||
468 | while ((ptr = strsep(&opts, ",")) != NULL) { | |
469 | if (!*ptr) | |
470 | continue; | |
471 | ||
472 | token = match_token(ptr, tokens, args); | |
473 | switch (token) { | |
474 | case Opt_udev_path: | |
475 | if (ib_dev->ibd_bd) { | |
6708bb27 | 476 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
477 | " ib_dev->ibd_bd exists\n"); |
478 | ret = -EEXIST; | |
479 | goto out; | |
480 | } | |
6d180253 JJ |
481 | arg_p = match_strdup(&args[0]); |
482 | if (!arg_p) { | |
483 | ret = -ENOMEM; | |
484 | break; | |
485 | } | |
486 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, | |
487 | "%s", arg_p); | |
488 | kfree(arg_p); | |
6708bb27 | 489 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
490 | ib_dev->ibd_udev_path); |
491 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
492 | break; | |
493 | case Opt_force: | |
c66ac9db NB |
494 | break; |
495 | default: | |
496 | break; | |
497 | } | |
498 | } | |
499 | ||
500 | out: | |
501 | kfree(orig); | |
502 | return (!ret) ? count : ret; | |
503 | } | |
504 | ||
505 | static ssize_t iblock_check_configfs_dev_params( | |
506 | struct se_hba *hba, | |
507 | struct se_subsystem_dev *se_dev) | |
508 | { | |
509 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
510 | ||
511 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { | |
6708bb27 | 512 | pr_err("Missing udev_path= parameters for IBLOCK\n"); |
e3d6f909 | 513 | return -EINVAL; |
c66ac9db NB |
514 | } |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | static ssize_t iblock_show_configfs_dev_params( | |
520 | struct se_hba *hba, | |
521 | struct se_subsystem_dev *se_dev, | |
522 | char *b) | |
523 | { | |
524 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
525 | struct block_device *bd = ibd->ibd_bd; | |
526 | char buf[BDEVNAME_SIZE]; | |
527 | ssize_t bl = 0; | |
528 | ||
529 | if (bd) | |
530 | bl += sprintf(b + bl, "iBlock device: %s", | |
531 | bdevname(bd, buf)); | |
532 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { | |
533 | bl += sprintf(b + bl, " UDEV PATH: %s\n", | |
534 | ibd->ibd_udev_path); | |
535 | } else | |
536 | bl += sprintf(b + bl, "\n"); | |
537 | ||
538 | bl += sprintf(b + bl, " "); | |
539 | if (bd) { | |
540 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 541 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
c66ac9db NB |
542 | "" : (bd->bd_holder == (struct iblock_dev *)ibd) ? |
543 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); | |
544 | } else { | |
21bca31c | 545 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
546 | } |
547 | ||
548 | return bl; | |
549 | } | |
550 | ||
551 | static void iblock_bio_destructor(struct bio *bio) | |
552 | { | |
553 | struct se_task *task = bio->bi_private; | |
554 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; | |
555 | ||
556 | bio_free(bio, ib_dev->ibd_bio_set); | |
557 | } | |
558 | ||
559 | static struct bio *iblock_get_bio( | |
560 | struct se_task *task, | |
561 | struct iblock_req *ib_req, | |
562 | struct iblock_dev *ib_dev, | |
563 | int *ret, | |
564 | sector_t lba, | |
565 | u32 sg_num) | |
566 | { | |
567 | struct bio *bio; | |
568 | ||
569 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
6708bb27 AG |
570 | if (!bio) { |
571 | pr_err("Unable to allocate memory for bio\n"); | |
c66ac9db NB |
572 | *ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
573 | return NULL; | |
574 | } | |
575 | ||
6708bb27 AG |
576 | pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:" |
577 | " %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set); | |
578 | pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size); | |
c66ac9db NB |
579 | |
580 | bio->bi_bdev = ib_dev->ibd_bd; | |
5951146d | 581 | bio->bi_private = task; |
c66ac9db NB |
582 | bio->bi_destructor = iblock_bio_destructor; |
583 | bio->bi_end_io = &iblock_bio_done; | |
584 | bio->bi_sector = lba; | |
585 | atomic_inc(&ib_req->ib_bio_cnt); | |
586 | ||
6708bb27 AG |
587 | pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector); |
588 | pr_debug("Set ib_req->ib_bio_cnt: %d\n", | |
c66ac9db NB |
589 | atomic_read(&ib_req->ib_bio_cnt)); |
590 | return bio; | |
591 | } | |
592 | ||
1d20bb61 | 593 | static int iblock_map_data_SG(struct se_task *task) |
c66ac9db NB |
594 | { |
595 | struct se_cmd *cmd = task->task_se_cmd; | |
5951146d | 596 | struct se_device *dev = cmd->se_dev; |
c66ac9db NB |
597 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; |
598 | struct iblock_req *ib_req = IBLOCK_REQ(task); | |
599 | struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; | |
600 | struct scatterlist *sg; | |
601 | int ret = 0; | |
6708bb27 | 602 | u32 i, sg_num = task->task_sg_nents; |
c66ac9db NB |
603 | sector_t block_lba; |
604 | /* | |
605 | * Do starting conversion up from non 512-byte blocksize with | |
606 | * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. | |
607 | */ | |
e3d6f909 | 608 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
c66ac9db | 609 | block_lba = (task->task_lba << 3); |
e3d6f909 | 610 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
c66ac9db | 611 | block_lba = (task->task_lba << 2); |
e3d6f909 | 612 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
c66ac9db | 613 | block_lba = (task->task_lba << 1); |
e3d6f909 | 614 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
c66ac9db NB |
615 | block_lba = task->task_lba; |
616 | else { | |
6708bb27 | 617 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
e3d6f909 | 618 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
619 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
620 | } | |
621 | ||
622 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num); | |
6708bb27 | 623 | if (!bio) |
c66ac9db NB |
624 | return ret; |
625 | ||
626 | ib_req->ib_bio = bio; | |
627 | hbio = tbio = bio; | |
628 | /* | |
629 | * Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist | |
ec98f782 | 630 | * from task->task_sg -> struct scatterlist memory. |
c66ac9db | 631 | */ |
6708bb27 AG |
632 | for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { |
633 | pr_debug("task: %p bio: %p Calling bio_add_page(): page:" | |
c66ac9db NB |
634 | " %p len: %u offset: %u\n", task, bio, sg_page(sg), |
635 | sg->length, sg->offset); | |
636 | again: | |
637 | ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset); | |
638 | if (ret != sg->length) { | |
639 | ||
6708bb27 AG |
640 | pr_debug("*** Set bio->bi_sector: %llu\n", |
641 | (unsigned long long)bio->bi_sector); | |
642 | pr_debug("** task->task_size: %u\n", | |
c66ac9db | 643 | task->task_size); |
6708bb27 | 644 | pr_debug("*** bio->bi_max_vecs: %u\n", |
c66ac9db | 645 | bio->bi_max_vecs); |
6708bb27 | 646 | pr_debug("*** bio->bi_vcnt: %u\n", |
c66ac9db NB |
647 | bio->bi_vcnt); |
648 | ||
649 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, | |
650 | block_lba, sg_num); | |
6708bb27 | 651 | if (!bio) |
c66ac9db NB |
652 | goto fail; |
653 | ||
654 | tbio = tbio->bi_next = bio; | |
6708bb27 | 655 | pr_debug("-----------------> Added +1 bio: %p to" |
c66ac9db NB |
656 | " list, Going to again\n", bio); |
657 | goto again; | |
658 | } | |
659 | /* Always in 512 byte units for Linux/Block */ | |
660 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
661 | sg_num--; | |
6708bb27 | 662 | pr_debug("task: %p bio-add_page() passed!, decremented" |
c66ac9db | 663 | " sg_num to %u\n", task, sg_num); |
6708bb27 AG |
664 | pr_debug("task: %p bio_add_page() passed!, increased lba" |
665 | " to %llu\n", task, (unsigned long long)block_lba); | |
666 | pr_debug("task: %p bio_add_page() passed!, bio->bi_vcnt:" | |
c66ac9db NB |
667 | " %u\n", task, bio->bi_vcnt); |
668 | } | |
669 | ||
670 | return 0; | |
671 | fail: | |
672 | while (hbio) { | |
673 | bio = hbio; | |
674 | hbio = hbio->bi_next; | |
675 | bio->bi_next = NULL; | |
676 | bio_put(bio); | |
677 | } | |
678 | return ret; | |
679 | } | |
680 | ||
681 | static unsigned char *iblock_get_cdb(struct se_task *task) | |
682 | { | |
683 | return IBLOCK_REQ(task)->ib_scsi_cdb; | |
684 | } | |
685 | ||
686 | static u32 iblock_get_device_rev(struct se_device *dev) | |
687 | { | |
688 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
689 | } | |
690 | ||
691 | static u32 iblock_get_device_type(struct se_device *dev) | |
692 | { | |
693 | return TYPE_DISK; | |
694 | } | |
695 | ||
696 | static sector_t iblock_get_blocks(struct se_device *dev) | |
697 | { | |
698 | struct iblock_dev *ibd = dev->dev_ptr; | |
699 | struct block_device *bd = ibd->ibd_bd; | |
700 | struct request_queue *q = bdev_get_queue(bd); | |
701 | ||
702 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
703 | } | |
704 | ||
705 | static void iblock_bio_done(struct bio *bio, int err) | |
706 | { | |
707 | struct se_task *task = bio->bi_private; | |
708 | struct iblock_req *ibr = IBLOCK_REQ(task); | |
709 | /* | |
710 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
711 | */ | |
6708bb27 | 712 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
c66ac9db NB |
713 | err = -EIO; |
714 | ||
715 | if (err != 0) { | |
6708bb27 | 716 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
c66ac9db NB |
717 | " err: %d\n", bio, err); |
718 | /* | |
719 | * Bump the ib_bio_err_cnt and release bio. | |
720 | */ | |
721 | atomic_inc(&ibr->ib_bio_err_cnt); | |
722 | smp_mb__after_atomic_inc(); | |
723 | bio_put(bio); | |
724 | /* | |
725 | * Wait to complete the task until the last bio as completed. | |
726 | */ | |
6708bb27 | 727 | if (!atomic_dec_and_test(&ibr->ib_bio_cnt)) |
c66ac9db NB |
728 | return; |
729 | ||
730 | ibr->ib_bio = NULL; | |
731 | transport_complete_task(task, 0); | |
732 | return; | |
733 | } | |
6708bb27 AG |
734 | pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", |
735 | task, bio, task->task_lba, (unsigned long long)bio->bi_sector, err); | |
c66ac9db NB |
736 | /* |
737 | * bio_put() will call iblock_bio_destructor() to release the bio back | |
738 | * to ibr->ib_bio_set. | |
739 | */ | |
740 | bio_put(bio); | |
741 | /* | |
742 | * Wait to complete the task until the last bio as completed. | |
743 | */ | |
6708bb27 | 744 | if (!atomic_dec_and_test(&ibr->ib_bio_cnt)) |
c66ac9db NB |
745 | return; |
746 | /* | |
747 | * Return GOOD status for task if zero ib_bio_err_cnt exists. | |
748 | */ | |
749 | ibr->ib_bio = NULL; | |
750 | transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt))); | |
751 | } | |
752 | ||
753 | static struct se_subsystem_api iblock_template = { | |
754 | .name = "iblock", | |
755 | .owner = THIS_MODULE, | |
756 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
1d20bb61 | 757 | .map_data_SG = iblock_map_data_SG, |
c66ac9db NB |
758 | .attach_hba = iblock_attach_hba, |
759 | .detach_hba = iblock_detach_hba, | |
760 | .allocate_virtdevice = iblock_allocate_virtdevice, | |
761 | .create_virtdevice = iblock_create_virtdevice, | |
762 | .free_device = iblock_free_device, | |
763 | .dpo_emulated = iblock_emulated_dpo, | |
764 | .fua_write_emulated = iblock_emulated_fua_write, | |
765 | .fua_read_emulated = iblock_emulated_fua_read, | |
766 | .write_cache_emulated = iblock_emulated_write_cache, | |
767 | .alloc_task = iblock_alloc_task, | |
768 | .do_task = iblock_do_task, | |
769 | .do_discard = iblock_do_discard, | |
770 | .do_sync_cache = iblock_emulate_sync_cache, | |
771 | .free_task = iblock_free_task, | |
772 | .check_configfs_dev_params = iblock_check_configfs_dev_params, | |
773 | .set_configfs_dev_params = iblock_set_configfs_dev_params, | |
774 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
775 | .get_cdb = iblock_get_cdb, | |
776 | .get_device_rev = iblock_get_device_rev, | |
777 | .get_device_type = iblock_get_device_type, | |
778 | .get_blocks = iblock_get_blocks, | |
779 | }; | |
780 | ||
781 | static int __init iblock_module_init(void) | |
782 | { | |
783 | return transport_subsystem_register(&iblock_template); | |
784 | } | |
785 | ||
786 | static void iblock_module_exit(void) | |
787 | { | |
788 | transport_subsystem_release(&iblock_template); | |
789 | } | |
790 | ||
791 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
792 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
793 | MODULE_LICENSE("GPL"); | |
794 | ||
795 | module_init(iblock_module_init); | |
796 | module_exit(iblock_module_exit); |