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> | |
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 | ||
d5b4a21b CH |
49 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
50 | #define IBLOCK_BIO_POOL_SIZE 128 | |
51 | ||
c66ac9db NB |
52 | static struct se_subsystem_api iblock_template; |
53 | ||
54 | static void iblock_bio_done(struct bio *, int); | |
55 | ||
56 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) | |
57 | * | |
58 | * | |
59 | */ | |
60 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
61 | { | |
6708bb27 | 62 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
63 | " Generic Target Core Stack %s\n", hba->hba_id, |
64 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
65 | return 0; |
66 | } | |
67 | ||
68 | static void iblock_detach_hba(struct se_hba *hba) | |
69 | { | |
c66ac9db NB |
70 | } |
71 | ||
72 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) | |
73 | { | |
74 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
75 | |
76 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
77 | if (!ib_dev) { |
78 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
79 | return NULL; |
80 | } | |
c66ac9db | 81 | |
6708bb27 | 82 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db NB |
83 | |
84 | return ib_dev; | |
85 | } | |
86 | ||
87 | static struct se_device *iblock_create_virtdevice( | |
88 | struct se_hba *hba, | |
89 | struct se_subsystem_dev *se_dev, | |
90 | void *p) | |
91 | { | |
92 | struct iblock_dev *ib_dev = p; | |
93 | struct se_device *dev; | |
94 | struct se_dev_limits dev_limits; | |
95 | struct block_device *bd = NULL; | |
96 | struct request_queue *q; | |
97 | struct queue_limits *limits; | |
98 | u32 dev_flags = 0; | |
613640e4 | 99 | int ret = -EINVAL; |
c66ac9db | 100 | |
6708bb27 AG |
101 | if (!ib_dev) { |
102 | pr_err("Unable to locate struct iblock_dev parameter\n"); | |
613640e4 | 103 | return ERR_PTR(ret); |
c66ac9db NB |
104 | } |
105 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
d5b4a21b CH |
106 | |
107 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 AG |
108 | if (!ib_dev->ibd_bio_set) { |
109 | pr_err("IBLOCK: Unable to create bioset()\n"); | |
613640e4 | 110 | return ERR_PTR(-ENOMEM); |
c66ac9db | 111 | } |
6708bb27 | 112 | pr_debug("IBLOCK: Created bio_set()\n"); |
c66ac9db NB |
113 | /* |
114 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path | |
115 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. | |
116 | */ | |
6708bb27 | 117 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
118 | ib_dev->ibd_udev_path); |
119 | ||
120 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, | |
121 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); | |
613640e4 NB |
122 | if (IS_ERR(bd)) { |
123 | ret = PTR_ERR(bd); | |
c66ac9db | 124 | goto failed; |
613640e4 | 125 | } |
c66ac9db NB |
126 | /* |
127 | * Setup the local scope queue_limits from struct request_queue->limits | |
128 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
129 | */ | |
130 | q = bdev_get_queue(bd); | |
131 | limits = &dev_limits.limits; | |
132 | limits->logical_block_size = bdev_logical_block_size(bd); | |
d5b4a21b CH |
133 | limits->max_hw_sectors = UINT_MAX; |
134 | limits->max_sectors = UINT_MAX; | |
8f3d14e2 NB |
135 | dev_limits.hw_queue_depth = q->nr_requests; |
136 | dev_limits.queue_depth = q->nr_requests; | |
c66ac9db | 137 | |
c66ac9db NB |
138 | ib_dev->ibd_bd = bd; |
139 | ||
140 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 141 | &iblock_template, se_dev, dev_flags, ib_dev, |
c66ac9db | 142 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
6708bb27 | 143 | if (!dev) |
c66ac9db NB |
144 | goto failed; |
145 | ||
c66ac9db NB |
146 | /* |
147 | * Check if the underlying struct block_device request_queue supports | |
148 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
149 | * in ATA and we need to set TPE=1 | |
150 | */ | |
613640e4 | 151 | if (blk_queue_discard(q)) { |
e3d6f909 | 152 | dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
c66ac9db NB |
153 | q->limits.max_discard_sectors; |
154 | /* | |
155 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
156 | */ | |
e3d6f909 AG |
157 | dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; |
158 | dev->se_sub_dev->se_dev_attrib.unmap_granularity = | |
7347b5ff | 159 | q->limits.discard_granularity >> 9; |
e3d6f909 | 160 | dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
161 | q->limits.discard_alignment; |
162 | ||
6708bb27 | 163 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
164 | " disabled by default\n"); |
165 | } | |
166 | ||
e22a7f07 RD |
167 | if (blk_queue_nonrot(q)) |
168 | dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; | |
169 | ||
c66ac9db NB |
170 | return dev; |
171 | ||
172 | failed: | |
173 | if (ib_dev->ibd_bio_set) { | |
174 | bioset_free(ib_dev->ibd_bio_set); | |
175 | ib_dev->ibd_bio_set = NULL; | |
176 | } | |
177 | ib_dev->ibd_bd = NULL; | |
613640e4 | 178 | return ERR_PTR(ret); |
c66ac9db NB |
179 | } |
180 | ||
181 | static void iblock_free_device(void *p) | |
182 | { | |
183 | struct iblock_dev *ib_dev = p; | |
184 | ||
bc665524 NB |
185 | if (ib_dev->ibd_bd != NULL) |
186 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
187 | if (ib_dev->ibd_bio_set != NULL) | |
188 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
189 | kfree(ib_dev); |
190 | } | |
191 | ||
192 | static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) | |
193 | { | |
194 | return container_of(task, struct iblock_req, ib_task); | |
195 | } | |
196 | ||
197 | static struct se_task * | |
6708bb27 | 198 | iblock_alloc_task(unsigned char *cdb) |
c66ac9db NB |
199 | { |
200 | struct iblock_req *ib_req; | |
201 | ||
202 | ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
6708bb27 AG |
203 | if (!ib_req) { |
204 | pr_err("Unable to allocate memory for struct iblock_req\n"); | |
c66ac9db NB |
205 | return NULL; |
206 | } | |
207 | ||
d5b4a21b | 208 | atomic_set(&ib_req->pending, 1); |
c66ac9db NB |
209 | return &ib_req->ib_task; |
210 | } | |
211 | ||
212 | static unsigned long long iblock_emulate_read_cap_with_block_size( | |
213 | struct se_device *dev, | |
214 | struct block_device *bd, | |
215 | struct request_queue *q) | |
216 | { | |
217 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
218 | bdev_logical_block_size(bd)) - 1); | |
219 | u32 block_size = bdev_logical_block_size(bd); | |
220 | ||
e3d6f909 | 221 | if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
c66ac9db NB |
222 | return blocks_long; |
223 | ||
224 | switch (block_size) { | |
225 | case 4096: | |
e3d6f909 | 226 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
227 | case 2048: |
228 | blocks_long <<= 1; | |
229 | break; | |
230 | case 1024: | |
231 | blocks_long <<= 2; | |
232 | break; | |
233 | case 512: | |
234 | blocks_long <<= 3; | |
235 | default: | |
236 | break; | |
237 | } | |
238 | break; | |
239 | case 2048: | |
e3d6f909 | 240 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
241 | case 4096: |
242 | blocks_long >>= 1; | |
243 | break; | |
244 | case 1024: | |
245 | blocks_long <<= 1; | |
246 | break; | |
247 | case 512: | |
248 | blocks_long <<= 2; | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | break; | |
254 | case 1024: | |
e3d6f909 | 255 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
256 | case 4096: |
257 | blocks_long >>= 2; | |
258 | break; | |
259 | case 2048: | |
260 | blocks_long >>= 1; | |
261 | break; | |
262 | case 512: | |
263 | blocks_long <<= 1; | |
264 | break; | |
265 | default: | |
266 | break; | |
267 | } | |
268 | break; | |
269 | case 512: | |
e3d6f909 | 270 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
271 | case 4096: |
272 | blocks_long >>= 3; | |
273 | break; | |
274 | case 2048: | |
275 | blocks_long >>= 2; | |
276 | break; | |
277 | case 1024: | |
278 | blocks_long >>= 1; | |
279 | break; | |
280 | default: | |
281 | break; | |
282 | } | |
283 | break; | |
284 | default: | |
285 | break; | |
286 | } | |
287 | ||
288 | return blocks_long; | |
289 | } | |
290 | ||
df5fa691 CH |
291 | static void iblock_end_io_flush(struct bio *bio, int err) |
292 | { | |
293 | struct se_cmd *cmd = bio->bi_private; | |
294 | ||
295 | if (err) | |
296 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
297 | ||
298 | if (cmd) | |
299 | transport_complete_sync_cache(cmd, err == 0); | |
300 | bio_put(bio); | |
301 | } | |
302 | ||
c66ac9db | 303 | /* |
df5fa691 CH |
304 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
305 | * always flush the whole cache. | |
c66ac9db NB |
306 | */ |
307 | static void iblock_emulate_sync_cache(struct se_task *task) | |
308 | { | |
e3d6f909 | 309 | struct se_cmd *cmd = task->task_se_cmd; |
c66ac9db | 310 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
a1d8b49a | 311 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 312 | struct bio *bio; |
c66ac9db NB |
313 | |
314 | /* | |
315 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 316 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
317 | */ |
318 | if (immed) | |
319 | transport_complete_sync_cache(cmd, 1); | |
320 | ||
df5fa691 CH |
321 | bio = bio_alloc(GFP_KERNEL, 0); |
322 | bio->bi_end_io = iblock_end_io_flush; | |
323 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 324 | if (!immed) |
df5fa691 CH |
325 | bio->bi_private = cmd; |
326 | submit_bio(WRITE_FLUSH, bio); | |
c66ac9db NB |
327 | } |
328 | ||
c66ac9db NB |
329 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) |
330 | { | |
331 | struct iblock_dev *ibd = dev->dev_ptr; | |
332 | struct block_device *bd = ibd->ibd_bd; | |
333 | int barrier = 0; | |
334 | ||
335 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); | |
336 | } | |
337 | ||
338 | static void iblock_free_task(struct se_task *task) | |
339 | { | |
dbbf3e94 | 340 | kfree(IBLOCK_REQ(task)); |
c66ac9db NB |
341 | } |
342 | ||
343 | enum { | |
344 | Opt_udev_path, Opt_force, Opt_err | |
345 | }; | |
346 | ||
347 | static match_table_t tokens = { | |
348 | {Opt_udev_path, "udev_path=%s"}, | |
349 | {Opt_force, "force=%d"}, | |
350 | {Opt_err, NULL} | |
351 | }; | |
352 | ||
353 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, | |
354 | struct se_subsystem_dev *se_dev, | |
355 | const char *page, ssize_t count) | |
356 | { | |
357 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; | |
6d180253 | 358 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 359 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 360 | int ret = 0, token; |
c66ac9db NB |
361 | |
362 | opts = kstrdup(page, GFP_KERNEL); | |
363 | if (!opts) | |
364 | return -ENOMEM; | |
365 | ||
366 | orig = opts; | |
367 | ||
90c161b6 | 368 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
369 | if (!*ptr) |
370 | continue; | |
371 | ||
372 | token = match_token(ptr, tokens, args); | |
373 | switch (token) { | |
374 | case Opt_udev_path: | |
375 | if (ib_dev->ibd_bd) { | |
6708bb27 | 376 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
377 | " ib_dev->ibd_bd exists\n"); |
378 | ret = -EEXIST; | |
379 | goto out; | |
380 | } | |
6d180253 JJ |
381 | arg_p = match_strdup(&args[0]); |
382 | if (!arg_p) { | |
383 | ret = -ENOMEM; | |
384 | break; | |
385 | } | |
386 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, | |
387 | "%s", arg_p); | |
388 | kfree(arg_p); | |
6708bb27 | 389 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
390 | ib_dev->ibd_udev_path); |
391 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
392 | break; | |
393 | case Opt_force: | |
c66ac9db NB |
394 | break; |
395 | default: | |
396 | break; | |
397 | } | |
398 | } | |
399 | ||
400 | out: | |
401 | kfree(orig); | |
402 | return (!ret) ? count : ret; | |
403 | } | |
404 | ||
405 | static ssize_t iblock_check_configfs_dev_params( | |
406 | struct se_hba *hba, | |
407 | struct se_subsystem_dev *se_dev) | |
408 | { | |
409 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
410 | ||
411 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { | |
6708bb27 | 412 | pr_err("Missing udev_path= parameters for IBLOCK\n"); |
e3d6f909 | 413 | return -EINVAL; |
c66ac9db NB |
414 | } |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | static ssize_t iblock_show_configfs_dev_params( | |
420 | struct se_hba *hba, | |
421 | struct se_subsystem_dev *se_dev, | |
422 | char *b) | |
423 | { | |
424 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
425 | struct block_device *bd = ibd->ibd_bd; | |
426 | char buf[BDEVNAME_SIZE]; | |
427 | ssize_t bl = 0; | |
428 | ||
429 | if (bd) | |
430 | bl += sprintf(b + bl, "iBlock device: %s", | |
431 | bdevname(bd, buf)); | |
432 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { | |
433 | bl += sprintf(b + bl, " UDEV PATH: %s\n", | |
434 | ibd->ibd_udev_path); | |
435 | } else | |
436 | bl += sprintf(b + bl, "\n"); | |
437 | ||
438 | bl += sprintf(b + bl, " "); | |
439 | if (bd) { | |
440 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 441 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
8359cf43 | 442 | "" : (bd->bd_holder == ibd) ? |
c66ac9db NB |
443 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
444 | } else { | |
21bca31c | 445 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
446 | } |
447 | ||
448 | return bl; | |
449 | } | |
450 | ||
451 | static void iblock_bio_destructor(struct bio *bio) | |
452 | { | |
453 | struct se_task *task = bio->bi_private; | |
42bf829e | 454 | struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; |
c66ac9db NB |
455 | |
456 | bio_free(bio, ib_dev->ibd_bio_set); | |
457 | } | |
458 | ||
dbbf3e94 CH |
459 | static struct bio * |
460 | iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num) | |
c66ac9db | 461 | { |
42bf829e | 462 | struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; |
dbbf3e94 | 463 | struct iblock_req *ib_req = IBLOCK_REQ(task); |
c66ac9db NB |
464 | struct bio *bio; |
465 | ||
5c55125f CH |
466 | /* |
467 | * Only allocate as many vector entries as the bio code allows us to, | |
468 | * we'll loop later on until we have handled the whole request. | |
469 | */ | |
470 | if (sg_num > BIO_MAX_PAGES) | |
471 | sg_num = BIO_MAX_PAGES; | |
472 | ||
c66ac9db | 473 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
6708bb27 AG |
474 | if (!bio) { |
475 | pr_err("Unable to allocate memory for bio\n"); | |
c66ac9db NB |
476 | return NULL; |
477 | } | |
478 | ||
6708bb27 AG |
479 | pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:" |
480 | " %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set); | |
481 | pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size); | |
c66ac9db NB |
482 | |
483 | bio->bi_bdev = ib_dev->ibd_bd; | |
5951146d | 484 | bio->bi_private = task; |
c66ac9db NB |
485 | bio->bi_destructor = iblock_bio_destructor; |
486 | bio->bi_end_io = &iblock_bio_done; | |
487 | bio->bi_sector = lba; | |
d5b4a21b | 488 | atomic_inc(&ib_req->pending); |
c66ac9db | 489 | |
6708bb27 | 490 | pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector); |
d5b4a21b | 491 | pr_debug("Set ib_req->pending: %d\n", atomic_read(&ib_req->pending)); |
c66ac9db NB |
492 | return bio; |
493 | } | |
494 | ||
d5b4a21b CH |
495 | static void iblock_submit_bios(struct bio_list *list, int rw) |
496 | { | |
497 | struct blk_plug plug; | |
498 | struct bio *bio; | |
499 | ||
500 | blk_start_plug(&plug); | |
501 | while ((bio = bio_list_pop(list))) | |
502 | submit_bio(rw, bio); | |
503 | blk_finish_plug(&plug); | |
504 | } | |
505 | ||
dbbf3e94 | 506 | static int iblock_do_task(struct se_task *task) |
c66ac9db NB |
507 | { |
508 | struct se_cmd *cmd = task->task_se_cmd; | |
5951146d | 509 | struct se_device *dev = cmd->se_dev; |
d5b4a21b | 510 | struct iblock_req *ibr = IBLOCK_REQ(task); |
dbbf3e94 CH |
511 | struct bio *bio; |
512 | struct bio_list list; | |
c66ac9db | 513 | struct scatterlist *sg; |
6708bb27 | 514 | u32 i, sg_num = task->task_sg_nents; |
c66ac9db | 515 | sector_t block_lba; |
d5b4a21b | 516 | unsigned bio_cnt; |
dbbf3e94 CH |
517 | int rw; |
518 | ||
519 | if (task->task_data_direction == DMA_TO_DEVICE) { | |
520 | /* | |
521 | * Force data to disk if we pretend to not have a volatile | |
522 | * write cache, or the initiator set the Force Unit Access bit. | |
523 | */ | |
524 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || | |
525 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 526 | (cmd->se_cmd_flags & SCF_FUA))) |
dbbf3e94 CH |
527 | rw = WRITE_FUA; |
528 | else | |
529 | rw = WRITE; | |
530 | } else { | |
531 | rw = READ; | |
532 | } | |
533 | ||
c66ac9db NB |
534 | /* |
535 | * Do starting conversion up from non 512-byte blocksize with | |
536 | * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. | |
537 | */ | |
e3d6f909 | 538 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
c66ac9db | 539 | block_lba = (task->task_lba << 3); |
e3d6f909 | 540 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
c66ac9db | 541 | block_lba = (task->task_lba << 2); |
e3d6f909 | 542 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
c66ac9db | 543 | block_lba = (task->task_lba << 1); |
e3d6f909 | 544 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
c66ac9db NB |
545 | block_lba = task->task_lba; |
546 | else { | |
6708bb27 | 547 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
e3d6f909 | 548 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
03e98c9e NB |
549 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
550 | return -ENOSYS; | |
c66ac9db NB |
551 | } |
552 | ||
dbbf3e94 | 553 | bio = iblock_get_bio(task, block_lba, sg_num); |
03e98c9e NB |
554 | if (!bio) { |
555 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
556 | return -ENOMEM; | |
557 | } | |
dbbf3e94 CH |
558 | |
559 | bio_list_init(&list); | |
560 | bio_list_add(&list, bio); | |
d5b4a21b | 561 | bio_cnt = 1; |
c66ac9db | 562 | |
6708bb27 | 563 | for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { |
dbbf3e94 CH |
564 | /* |
565 | * XXX: if the length the device accepts is shorter than the | |
566 | * length of the S/G list entry this will cause and | |
567 | * endless loop. Better hope no driver uses huge pages. | |
568 | */ | |
569 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
570 | != sg->length) { | |
d5b4a21b CH |
571 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
572 | iblock_submit_bios(&list, rw); | |
573 | bio_cnt = 0; | |
574 | } | |
575 | ||
dbbf3e94 | 576 | bio = iblock_get_bio(task, block_lba, sg_num); |
6708bb27 | 577 | if (!bio) |
c66ac9db | 578 | goto fail; |
dbbf3e94 | 579 | bio_list_add(&list, bio); |
d5b4a21b | 580 | bio_cnt++; |
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 | ||
d5b4a21b | 588 | iblock_submit_bios(&list, rw); |
dbbf3e94 | 589 | |
d5b4a21b CH |
590 | if (atomic_dec_and_test(&ibr->pending)) { |
591 | transport_complete_task(task, | |
592 | !atomic_read(&ibr->ib_bio_err_cnt)); | |
593 | } | |
03e98c9e | 594 | return 0; |
dbbf3e94 | 595 | |
c66ac9db | 596 | fail: |
dbbf3e94 | 597 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 598 | bio_put(bio); |
03e98c9e NB |
599 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
600 | return -ENOMEM; | |
c66ac9db NB |
601 | } |
602 | ||
c66ac9db NB |
603 | static u32 iblock_get_device_rev(struct se_device *dev) |
604 | { | |
605 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
606 | } | |
607 | ||
608 | static u32 iblock_get_device_type(struct se_device *dev) | |
609 | { | |
610 | return TYPE_DISK; | |
611 | } | |
612 | ||
613 | static sector_t iblock_get_blocks(struct se_device *dev) | |
614 | { | |
615 | struct iblock_dev *ibd = dev->dev_ptr; | |
616 | struct block_device *bd = ibd->ibd_bd; | |
617 | struct request_queue *q = bdev_get_queue(bd); | |
618 | ||
619 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
620 | } | |
621 | ||
622 | static void iblock_bio_done(struct bio *bio, int err) | |
623 | { | |
624 | struct se_task *task = bio->bi_private; | |
625 | struct iblock_req *ibr = IBLOCK_REQ(task); | |
dbbf3e94 | 626 | |
c66ac9db NB |
627 | /* |
628 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
629 | */ | |
6708bb27 | 630 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
c66ac9db NB |
631 | err = -EIO; |
632 | ||
633 | if (err != 0) { | |
6708bb27 | 634 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
c66ac9db NB |
635 | " err: %d\n", bio, err); |
636 | /* | |
637 | * Bump the ib_bio_err_cnt and release bio. | |
638 | */ | |
639 | atomic_inc(&ibr->ib_bio_err_cnt); | |
640 | smp_mb__after_atomic_inc(); | |
c66ac9db | 641 | } |
dbbf3e94 | 642 | |
c66ac9db | 643 | bio_put(bio); |
dbbf3e94 | 644 | |
d5b4a21b | 645 | if (!atomic_dec_and_test(&ibr->pending)) |
c66ac9db | 646 | return; |
dbbf3e94 CH |
647 | |
648 | pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", | |
649 | task, bio, task->task_lba, | |
650 | (unsigned long long)bio->bi_sector, err); | |
651 | ||
652 | transport_complete_task(task, !atomic_read(&ibr->ib_bio_err_cnt)); | |
c66ac9db NB |
653 | } |
654 | ||
655 | static struct se_subsystem_api iblock_template = { | |
656 | .name = "iblock", | |
657 | .owner = THIS_MODULE, | |
658 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
659 | .write_cache_emulated = 1, |
660 | .fua_write_emulated = 1, | |
c66ac9db NB |
661 | .attach_hba = iblock_attach_hba, |
662 | .detach_hba = iblock_detach_hba, | |
663 | .allocate_virtdevice = iblock_allocate_virtdevice, | |
664 | .create_virtdevice = iblock_create_virtdevice, | |
665 | .free_device = iblock_free_device, | |
c66ac9db NB |
666 | .alloc_task = iblock_alloc_task, |
667 | .do_task = iblock_do_task, | |
668 | .do_discard = iblock_do_discard, | |
669 | .do_sync_cache = iblock_emulate_sync_cache, | |
670 | .free_task = iblock_free_task, | |
671 | .check_configfs_dev_params = iblock_check_configfs_dev_params, | |
672 | .set_configfs_dev_params = iblock_set_configfs_dev_params, | |
673 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
c66ac9db NB |
674 | .get_device_rev = iblock_get_device_rev, |
675 | .get_device_type = iblock_get_device_type, | |
676 | .get_blocks = iblock_get_blocks, | |
677 | }; | |
678 | ||
679 | static int __init iblock_module_init(void) | |
680 | { | |
681 | return transport_subsystem_register(&iblock_template); | |
682 | } | |
683 | ||
684 | static void iblock_module_exit(void) | |
685 | { | |
686 | transport_subsystem_release(&iblock_template); | |
687 | } | |
688 | ||
689 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
690 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
691 | MODULE_LICENSE("GPL"); | |
692 | ||
693 | module_init(iblock_module_init); | |
694 | module_exit(iblock_module_exit); |