Commit | Line | Data |
---|---|---|
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> | |
827509e3 | 40 | #include <linux/module.h> |
c66ac9db NB |
41 | #include <scsi/scsi.h> |
42 | #include <scsi/scsi_host.h> | |
43 | ||
44 | #include <target/target_core_base.h> | |
c4795fb2 | 45 | #include <target/target_core_backend.h> |
c66ac9db NB |
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 | */ | |
48cfe37c | 132 | ib_dev->ibd_bio_set = bioset_create(32, 0); |
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 = | |
7347b5ff | 184 | q->limits.discard_granularity >> 9; |
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 | ||
df5fa691 CH |
316 | static void iblock_end_io_flush(struct bio *bio, int err) |
317 | { | |
318 | struct se_cmd *cmd = bio->bi_private; | |
319 | ||
320 | if (err) | |
321 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
322 | ||
323 | if (cmd) | |
324 | transport_complete_sync_cache(cmd, err == 0); | |
325 | bio_put(bio); | |
326 | } | |
327 | ||
c66ac9db | 328 | /* |
df5fa691 CH |
329 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
330 | * always flush the whole cache. | |
c66ac9db NB |
331 | */ |
332 | static void iblock_emulate_sync_cache(struct se_task *task) | |
333 | { | |
e3d6f909 | 334 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 335 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
a1d8b49a | 336 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 337 | struct bio *bio; |
c66ac9db NB |
338 | |
339 | /* | |
340 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 341 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
342 | */ |
343 | if (immed) | |
344 | transport_complete_sync_cache(cmd, 1); | |
345 | ||
df5fa691 CH |
346 | bio = bio_alloc(GFP_KERNEL, 0); |
347 | bio->bi_end_io = iblock_end_io_flush; | |
348 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 349 | if (!immed) |
df5fa691 CH |
350 | bio->bi_private = cmd; |
351 | submit_bio(WRITE_FLUSH, bio); | |
c66ac9db NB |
352 | } |
353 | ||
c66ac9db NB |
354 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) |
355 | { | |
356 | struct iblock_dev *ibd = dev->dev_ptr; | |
357 | struct block_device *bd = ibd->ibd_bd; | |
358 | int barrier = 0; | |
359 | ||
360 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); | |
361 | } | |
362 | ||
363 | static void iblock_free_task(struct se_task *task) | |
364 | { | |
dbbf3e94 | 365 | kfree(IBLOCK_REQ(task)); |
c66ac9db NB |
366 | } |
367 | ||
368 | enum { | |
369 | Opt_udev_path, Opt_force, Opt_err | |
370 | }; | |
371 | ||
372 | static match_table_t tokens = { | |
373 | {Opt_udev_path, "udev_path=%s"}, | |
374 | {Opt_force, "force=%d"}, | |
375 | {Opt_err, NULL} | |
376 | }; | |
377 | ||
378 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, | |
379 | struct se_subsystem_dev *se_dev, | |
380 | const char *page, ssize_t count) | |
381 | { | |
382 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; | |
6d180253 | 383 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 384 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 385 | int ret = 0, token; |
c66ac9db NB |
386 | |
387 | opts = kstrdup(page, GFP_KERNEL); | |
388 | if (!opts) | |
389 | return -ENOMEM; | |
390 | ||
391 | orig = opts; | |
392 | ||
90c161b6 | 393 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
394 | if (!*ptr) |
395 | continue; | |
396 | ||
397 | token = match_token(ptr, tokens, args); | |
398 | switch (token) { | |
399 | case Opt_udev_path: | |
400 | if (ib_dev->ibd_bd) { | |
6708bb27 | 401 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
402 | " ib_dev->ibd_bd exists\n"); |
403 | ret = -EEXIST; | |
404 | goto out; | |
405 | } | |
6d180253 JJ |
406 | arg_p = match_strdup(&args[0]); |
407 | if (!arg_p) { | |
408 | ret = -ENOMEM; | |
409 | break; | |
410 | } | |
411 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, | |
412 | "%s", arg_p); | |
413 | kfree(arg_p); | |
6708bb27 | 414 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
415 | ib_dev->ibd_udev_path); |
416 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
417 | break; | |
418 | case Opt_force: | |
c66ac9db NB |
419 | break; |
420 | default: | |
421 | break; | |
422 | } | |
423 | } | |
424 | ||
425 | out: | |
426 | kfree(orig); | |
427 | return (!ret) ? count : ret; | |
428 | } | |
429 | ||
430 | static ssize_t iblock_check_configfs_dev_params( | |
431 | struct se_hba *hba, | |
432 | struct se_subsystem_dev *se_dev) | |
433 | { | |
434 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
435 | ||
436 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { | |
6708bb27 | 437 | pr_err("Missing udev_path= parameters for IBLOCK\n"); |
e3d6f909 | 438 | return -EINVAL; |
c66ac9db NB |
439 | } |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static ssize_t iblock_show_configfs_dev_params( | |
445 | struct se_hba *hba, | |
446 | struct se_subsystem_dev *se_dev, | |
447 | char *b) | |
448 | { | |
449 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
450 | struct block_device *bd = ibd->ibd_bd; | |
451 | char buf[BDEVNAME_SIZE]; | |
452 | ssize_t bl = 0; | |
453 | ||
454 | if (bd) | |
455 | bl += sprintf(b + bl, "iBlock device: %s", | |
456 | bdevname(bd, buf)); | |
457 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { | |
458 | bl += sprintf(b + bl, " UDEV PATH: %s\n", | |
459 | ibd->ibd_udev_path); | |
460 | } else | |
461 | bl += sprintf(b + bl, "\n"); | |
462 | ||
463 | bl += sprintf(b + bl, " "); | |
464 | if (bd) { | |
465 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 466 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
8359cf43 | 467 | "" : (bd->bd_holder == ibd) ? |
c66ac9db NB |
468 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
469 | } else { | |
21bca31c | 470 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
471 | } |
472 | ||
473 | return bl; | |
474 | } | |
475 | ||
476 | static void iblock_bio_destructor(struct bio *bio) | |
477 | { | |
478 | struct se_task *task = bio->bi_private; | |
42bf829e | 479 | struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; |
c66ac9db NB |
480 | |
481 | bio_free(bio, ib_dev->ibd_bio_set); | |
482 | } | |
483 | ||
dbbf3e94 CH |
484 | static struct bio * |
485 | iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num) | |
c66ac9db | 486 | { |
42bf829e | 487 | struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; |
dbbf3e94 | 488 | struct iblock_req *ib_req = IBLOCK_REQ(task); |
c66ac9db NB |
489 | struct bio *bio; |
490 | ||
491 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
6708bb27 AG |
492 | if (!bio) { |
493 | pr_err("Unable to allocate memory for bio\n"); | |
c66ac9db NB |
494 | return NULL; |
495 | } | |
496 | ||
6708bb27 AG |
497 | pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:" |
498 | " %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set); | |
499 | pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size); | |
c66ac9db NB |
500 | |
501 | bio->bi_bdev = ib_dev->ibd_bd; | |
5951146d | 502 | bio->bi_private = task; |
c66ac9db NB |
503 | bio->bi_destructor = iblock_bio_destructor; |
504 | bio->bi_end_io = &iblock_bio_done; | |
505 | bio->bi_sector = lba; | |
506 | atomic_inc(&ib_req->ib_bio_cnt); | |
507 | ||
6708bb27 AG |
508 | pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector); |
509 | pr_debug("Set ib_req->ib_bio_cnt: %d\n", | |
c66ac9db NB |
510 | atomic_read(&ib_req->ib_bio_cnt)); |
511 | return bio; | |
512 | } | |
513 | ||
dbbf3e94 | 514 | static int iblock_do_task(struct se_task *task) |
c66ac9db NB |
515 | { |
516 | struct se_cmd *cmd = task->task_se_cmd; | |
5951146d | 517 | struct se_device *dev = cmd->se_dev; |
dbbf3e94 CH |
518 | struct bio *bio; |
519 | struct bio_list list; | |
c66ac9db | 520 | struct scatterlist *sg; |
6708bb27 | 521 | u32 i, sg_num = task->task_sg_nents; |
c66ac9db | 522 | sector_t block_lba; |
dbbf3e94 CH |
523 | struct blk_plug plug; |
524 | int rw; | |
525 | ||
526 | if (task->task_data_direction == DMA_TO_DEVICE) { | |
527 | /* | |
528 | * Force data to disk if we pretend to not have a volatile | |
529 | * write cache, or the initiator set the Force Unit Access bit. | |
530 | */ | |
531 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || | |
532 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 533 | (cmd->se_cmd_flags & SCF_FUA))) |
dbbf3e94 CH |
534 | rw = WRITE_FUA; |
535 | else | |
536 | rw = WRITE; | |
537 | } else { | |
538 | rw = READ; | |
539 | } | |
540 | ||
c66ac9db NB |
541 | /* |
542 | * Do starting conversion up from non 512-byte blocksize with | |
543 | * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. | |
544 | */ | |
e3d6f909 | 545 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
c66ac9db | 546 | block_lba = (task->task_lba << 3); |
e3d6f909 | 547 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
c66ac9db | 548 | block_lba = (task->task_lba << 2); |
e3d6f909 | 549 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
c66ac9db | 550 | block_lba = (task->task_lba << 1); |
e3d6f909 | 551 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
c66ac9db NB |
552 | block_lba = task->task_lba; |
553 | else { | |
6708bb27 | 554 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
e3d6f909 | 555 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
03e98c9e NB |
556 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
557 | return -ENOSYS; | |
c66ac9db NB |
558 | } |
559 | ||
dbbf3e94 | 560 | bio = iblock_get_bio(task, block_lba, sg_num); |
03e98c9e NB |
561 | if (!bio) { |
562 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
563 | return -ENOMEM; | |
564 | } | |
dbbf3e94 CH |
565 | |
566 | bio_list_init(&list); | |
567 | bio_list_add(&list, bio); | |
c66ac9db | 568 | |
6708bb27 | 569 | for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { |
dbbf3e94 CH |
570 | /* |
571 | * XXX: if the length the device accepts is shorter than the | |
572 | * length of the S/G list entry this will cause and | |
573 | * endless loop. Better hope no driver uses huge pages. | |
574 | */ | |
575 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
576 | != sg->length) { | |
577 | bio = iblock_get_bio(task, block_lba, sg_num); | |
6708bb27 | 578 | if (!bio) |
c66ac9db | 579 | goto fail; |
dbbf3e94 | 580 | bio_list_add(&list, bio); |
c66ac9db | 581 | } |
dbbf3e94 | 582 | |
c66ac9db NB |
583 | /* Always in 512 byte units for Linux/Block */ |
584 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
585 | sg_num--; | |
c66ac9db NB |
586 | } |
587 | ||
dbbf3e94 CH |
588 | blk_start_plug(&plug); |
589 | while ((bio = bio_list_pop(&list))) | |
590 | submit_bio(rw, bio); | |
591 | blk_finish_plug(&plug); | |
592 | ||
03e98c9e | 593 | return 0; |
dbbf3e94 | 594 | |
c66ac9db | 595 | fail: |
dbbf3e94 | 596 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 597 | bio_put(bio); |
03e98c9e NB |
598 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
599 | return -ENOMEM; | |
c66ac9db NB |
600 | } |
601 | ||
c66ac9db NB |
602 | static u32 iblock_get_device_rev(struct se_device *dev) |
603 | { | |
604 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
605 | } | |
606 | ||
607 | static u32 iblock_get_device_type(struct se_device *dev) | |
608 | { | |
609 | return TYPE_DISK; | |
610 | } | |
611 | ||
612 | static sector_t iblock_get_blocks(struct se_device *dev) | |
613 | { | |
614 | struct iblock_dev *ibd = dev->dev_ptr; | |
615 | struct block_device *bd = ibd->ibd_bd; | |
616 | struct request_queue *q = bdev_get_queue(bd); | |
617 | ||
618 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
619 | } | |
620 | ||
621 | static void iblock_bio_done(struct bio *bio, int err) | |
622 | { | |
623 | struct se_task *task = bio->bi_private; | |
624 | struct iblock_req *ibr = IBLOCK_REQ(task); | |
dbbf3e94 | 625 | |
c66ac9db NB |
626 | /* |
627 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
628 | */ | |
6708bb27 | 629 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
c66ac9db NB |
630 | err = -EIO; |
631 | ||
632 | if (err != 0) { | |
6708bb27 | 633 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
c66ac9db NB |
634 | " err: %d\n", bio, err); |
635 | /* | |
636 | * Bump the ib_bio_err_cnt and release bio. | |
637 | */ | |
638 | atomic_inc(&ibr->ib_bio_err_cnt); | |
639 | smp_mb__after_atomic_inc(); | |
c66ac9db | 640 | } |
dbbf3e94 | 641 | |
c66ac9db | 642 | bio_put(bio); |
dbbf3e94 | 643 | |
6708bb27 | 644 | if (!atomic_dec_and_test(&ibr->ib_bio_cnt)) |
c66ac9db | 645 | return; |
dbbf3e94 CH |
646 | |
647 | pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", | |
648 | task, bio, task->task_lba, | |
649 | (unsigned long long)bio->bi_sector, err); | |
650 | ||
651 | transport_complete_task(task, !atomic_read(&ibr->ib_bio_err_cnt)); | |
c66ac9db NB |
652 | } |
653 | ||
654 | static struct se_subsystem_api iblock_template = { | |
655 | .name = "iblock", | |
656 | .owner = THIS_MODULE, | |
657 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
658 | .write_cache_emulated = 1, |
659 | .fua_write_emulated = 1, | |
c66ac9db NB |
660 | .attach_hba = iblock_attach_hba, |
661 | .detach_hba = iblock_detach_hba, | |
662 | .allocate_virtdevice = iblock_allocate_virtdevice, | |
663 | .create_virtdevice = iblock_create_virtdevice, | |
664 | .free_device = iblock_free_device, | |
c66ac9db NB |
665 | .alloc_task = iblock_alloc_task, |
666 | .do_task = iblock_do_task, | |
667 | .do_discard = iblock_do_discard, | |
668 | .do_sync_cache = iblock_emulate_sync_cache, | |
669 | .free_task = iblock_free_task, | |
670 | .check_configfs_dev_params = iblock_check_configfs_dev_params, | |
671 | .set_configfs_dev_params = iblock_set_configfs_dev_params, | |
672 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
c66ac9db NB |
673 | .get_device_rev = iblock_get_device_rev, |
674 | .get_device_type = iblock_get_device_type, | |
675 | .get_blocks = iblock_get_blocks, | |
676 | }; | |
677 | ||
678 | static int __init iblock_module_init(void) | |
679 | { | |
680 | return transport_subsystem_register(&iblock_template); | |
681 | } | |
682 | ||
683 | static void iblock_module_exit(void) | |
684 | { | |
685 | transport_subsystem_release(&iblock_template); | |
686 | } | |
687 | ||
688 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
689 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
690 | MODULE_LICENSE("GPL"); | |
691 | ||
692 | module_init(iblock_module_init); | |
693 | module_exit(iblock_module_exit); |