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 | * | |
4c76251e | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/string.h> |
28 | #include <linux/parser.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
c66ac9db NB |
34 | #include <linux/bio.h> |
35 | #include <linux/genhd.h> | |
36 | #include <linux/file.h> | |
827509e3 | 37 | #include <linux/module.h> |
c66ac9db NB |
38 | #include <scsi/scsi.h> |
39 | #include <scsi/scsi_host.h> | |
14150a6b | 40 | #include <asm/unaligned.h> |
c66ac9db NB |
41 | |
42 | #include <target/target_core_base.h> | |
c4795fb2 | 43 | #include <target/target_core_backend.h> |
c66ac9db NB |
44 | |
45 | #include "target_core_iblock.h" | |
46 | ||
d5b4a21b CH |
47 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
48 | #define IBLOCK_BIO_POOL_SIZE 128 | |
49 | ||
0fd97ccf CH |
50 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
51 | { | |
52 | return container_of(dev, struct iblock_dev, dev); | |
53 | } | |
54 | ||
55 | ||
c66ac9db NB |
56 | static struct se_subsystem_api iblock_template; |
57 | ||
c66ac9db NB |
58 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
59 | * | |
60 | * | |
61 | */ | |
62 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
63 | { | |
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
65 | " Generic Target Core Stack %s\n", hba->hba_id, |
66 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
67 | return 0; |
68 | } | |
69 | ||
70 | static void iblock_detach_hba(struct se_hba *hba) | |
71 | { | |
c66ac9db NB |
72 | } |
73 | ||
0fd97ccf | 74 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
75 | { |
76 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
77 | |
78 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
79 | if (!ib_dev) { |
80 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
81 | return NULL; |
82 | } | |
c66ac9db | 83 | |
6708bb27 | 84 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 85 | |
0fd97ccf | 86 | return &ib_dev->dev; |
c66ac9db NB |
87 | } |
88 | ||
0fd97ccf | 89 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 90 | { |
0fd97ccf | 91 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 92 | struct request_queue *q; |
0fd97ccf | 93 | struct block_device *bd = NULL; |
44bfd018 | 94 | fmode_t mode; |
0fd97ccf | 95 | int ret = -ENOMEM; |
c66ac9db | 96 | |
0fd97ccf CH |
97 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
98 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
99 | return -EINVAL; | |
c66ac9db | 100 | } |
d5b4a21b CH |
101 | |
102 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 103 | if (!ib_dev->ibd_bio_set) { |
0fd97ccf CH |
104 | pr_err("IBLOCK: Unable to create bioset\n"); |
105 | goto out; | |
c66ac9db | 106 | } |
0fd97ccf | 107 | |
6708bb27 | 108 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
109 | ib_dev->ibd_udev_path); |
110 | ||
44bfd018 AG |
111 | mode = FMODE_READ|FMODE_EXCL; |
112 | if (!ib_dev->ibd_readonly) | |
113 | mode |= FMODE_WRITE; | |
114 | ||
115 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
116 | if (IS_ERR(bd)) { |
117 | ret = PTR_ERR(bd); | |
0fd97ccf | 118 | goto out_free_bioset; |
613640e4 | 119 | } |
c66ac9db NB |
120 | ib_dev->ibd_bd = bd; |
121 | ||
0fd97ccf CH |
122 | q = bdev_get_queue(bd); |
123 | ||
124 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
125 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
126 | dev->dev_attrib.hw_queue_depth = q->nr_requests; | |
c66ac9db | 127 | |
c66ac9db NB |
128 | /* |
129 | * Check if the underlying struct block_device request_queue supports | |
130 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
131 | * in ATA and we need to set TPE=1 | |
132 | */ | |
613640e4 | 133 | if (blk_queue_discard(q)) { |
0fd97ccf | 134 | dev->dev_attrib.max_unmap_lba_count = |
c66ac9db | 135 | q->limits.max_discard_sectors; |
0fd97ccf | 136 | |
c66ac9db NB |
137 | /* |
138 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
139 | */ | |
0fd97ccf CH |
140 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
141 | dev->dev_attrib.unmap_granularity = | |
7347b5ff | 142 | q->limits.discard_granularity >> 9; |
0fd97ccf | 143 | dev->dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
144 | q->limits.discard_alignment; |
145 | ||
6708bb27 | 146 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
147 | " disabled by default\n"); |
148 | } | |
f6970ad3 NB |
149 | /* |
150 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
151 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
152 | */ | |
153 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 154 | |
e22a7f07 | 155 | if (blk_queue_nonrot(q)) |
0fd97ccf | 156 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 157 | |
0fd97ccf | 158 | return 0; |
c66ac9db | 159 | |
0fd97ccf CH |
160 | out_free_bioset: |
161 | bioset_free(ib_dev->ibd_bio_set); | |
162 | ib_dev->ibd_bio_set = NULL; | |
163 | out: | |
164 | return ret; | |
c66ac9db NB |
165 | } |
166 | ||
0fd97ccf | 167 | static void iblock_free_device(struct se_device *dev) |
c66ac9db | 168 | { |
0fd97ccf | 169 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 170 | |
bc665524 NB |
171 | if (ib_dev->ibd_bd != NULL) |
172 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
173 | if (ib_dev->ibd_bio_set != NULL) | |
174 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
175 | kfree(ib_dev); |
176 | } | |
177 | ||
c66ac9db NB |
178 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
179 | struct se_device *dev, | |
180 | struct block_device *bd, | |
181 | struct request_queue *q) | |
182 | { | |
183 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
184 | bdev_logical_block_size(bd)) - 1); | |
185 | u32 block_size = bdev_logical_block_size(bd); | |
186 | ||
0fd97ccf | 187 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
188 | return blocks_long; |
189 | ||
190 | switch (block_size) { | |
191 | case 4096: | |
0fd97ccf | 192 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
193 | case 2048: |
194 | blocks_long <<= 1; | |
195 | break; | |
196 | case 1024: | |
197 | blocks_long <<= 2; | |
198 | break; | |
199 | case 512: | |
200 | blocks_long <<= 3; | |
201 | default: | |
202 | break; | |
203 | } | |
204 | break; | |
205 | case 2048: | |
0fd97ccf | 206 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
207 | case 4096: |
208 | blocks_long >>= 1; | |
209 | break; | |
210 | case 1024: | |
211 | blocks_long <<= 1; | |
212 | break; | |
213 | case 512: | |
214 | blocks_long <<= 2; | |
215 | break; | |
216 | default: | |
217 | break; | |
218 | } | |
219 | break; | |
220 | case 1024: | |
0fd97ccf | 221 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
222 | case 4096: |
223 | blocks_long >>= 2; | |
224 | break; | |
225 | case 2048: | |
226 | blocks_long >>= 1; | |
227 | break; | |
228 | case 512: | |
229 | blocks_long <<= 1; | |
230 | break; | |
231 | default: | |
232 | break; | |
233 | } | |
234 | break; | |
235 | case 512: | |
0fd97ccf | 236 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
237 | case 4096: |
238 | blocks_long >>= 3; | |
239 | break; | |
240 | case 2048: | |
241 | blocks_long >>= 2; | |
242 | break; | |
243 | case 1024: | |
244 | blocks_long >>= 1; | |
245 | break; | |
246 | default: | |
247 | break; | |
248 | } | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | ||
254 | return blocks_long; | |
255 | } | |
256 | ||
3a41d85f NB |
257 | static void iblock_complete_cmd(struct se_cmd *cmd) |
258 | { | |
259 | struct iblock_req *ibr = cmd->priv; | |
260 | u8 status; | |
261 | ||
262 | if (!atomic_dec_and_test(&ibr->pending)) | |
263 | return; | |
264 | ||
265 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
266 | status = SAM_STAT_CHECK_CONDITION; | |
267 | else | |
268 | status = SAM_STAT_GOOD; | |
269 | ||
270 | target_complete_cmd(cmd, status); | |
271 | kfree(ibr); | |
272 | } | |
273 | ||
274 | static void iblock_bio_done(struct bio *bio, int err) | |
275 | { | |
276 | struct se_cmd *cmd = bio->bi_private; | |
277 | struct iblock_req *ibr = cmd->priv; | |
278 | ||
279 | /* | |
280 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
281 | */ | |
282 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) | |
283 | err = -EIO; | |
284 | ||
285 | if (err != 0) { | |
286 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," | |
287 | " err: %d\n", bio, err); | |
288 | /* | |
289 | * Bump the ib_bio_err_cnt and release bio. | |
290 | */ | |
291 | atomic_inc(&ibr->ib_bio_err_cnt); | |
292 | smp_mb__after_atomic_inc(); | |
293 | } | |
294 | ||
295 | bio_put(bio); | |
296 | ||
297 | iblock_complete_cmd(cmd); | |
298 | } | |
299 | ||
300 | static struct bio * | |
301 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
302 | { | |
303 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
304 | struct bio *bio; | |
305 | ||
306 | /* | |
307 | * Only allocate as many vector entries as the bio code allows us to, | |
308 | * we'll loop later on until we have handled the whole request. | |
309 | */ | |
310 | if (sg_num > BIO_MAX_PAGES) | |
311 | sg_num = BIO_MAX_PAGES; | |
312 | ||
313 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
314 | if (!bio) { | |
315 | pr_err("Unable to allocate memory for bio\n"); | |
316 | return NULL; | |
317 | } | |
318 | ||
319 | bio->bi_bdev = ib_dev->ibd_bd; | |
320 | bio->bi_private = cmd; | |
321 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 322 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
323 | |
324 | return bio; | |
325 | } | |
326 | ||
327 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
328 | { | |
329 | struct blk_plug plug; | |
330 | struct bio *bio; | |
331 | ||
332 | blk_start_plug(&plug); | |
333 | while ((bio = bio_list_pop(list))) | |
334 | submit_bio(rw, bio); | |
335 | blk_finish_plug(&plug); | |
336 | } | |
337 | ||
df5fa691 CH |
338 | static void iblock_end_io_flush(struct bio *bio, int err) |
339 | { | |
340 | struct se_cmd *cmd = bio->bi_private; | |
341 | ||
342 | if (err) | |
343 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
344 | ||
5787cacd | 345 | if (cmd) { |
de103c93 | 346 | if (err) |
5787cacd | 347 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 348 | else |
5787cacd | 349 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
350 | } |
351 | ||
df5fa691 CH |
352 | bio_put(bio); |
353 | } | |
354 | ||
c66ac9db | 355 | /* |
df5fa691 CH |
356 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
357 | * always flush the whole cache. | |
c66ac9db | 358 | */ |
de103c93 CH |
359 | static sense_reason_t |
360 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 361 | { |
0fd97ccf | 362 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 363 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 364 | struct bio *bio; |
c66ac9db NB |
365 | |
366 | /* | |
367 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 368 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
369 | */ |
370 | if (immed) | |
5787cacd | 371 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 372 | |
df5fa691 CH |
373 | bio = bio_alloc(GFP_KERNEL, 0); |
374 | bio->bi_end_io = iblock_end_io_flush; | |
375 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 376 | if (!immed) |
df5fa691 CH |
377 | bio->bi_private = cmd; |
378 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 379 | return 0; |
c66ac9db NB |
380 | } |
381 | ||
dbc21c5a | 382 | static sense_reason_t |
86d71829 | 383 | iblock_do_unmap(struct se_cmd *cmd, void *priv, |
dbc21c5a AH |
384 | sector_t lba, sector_t nolb) |
385 | { | |
86d71829 | 386 | struct block_device *bdev = priv; |
dbc21c5a AH |
387 | int ret; |
388 | ||
389 | ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0); | |
390 | if (ret < 0) { | |
391 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
392 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
393 | } | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
de103c93 CH |
398 | static sense_reason_t |
399 | iblock_execute_unmap(struct se_cmd *cmd) | |
c66ac9db | 400 | { |
86d71829 | 401 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
c66ac9db | 402 | |
86d71829 | 403 | return sbc_execute_unmap(cmd, iblock_do_unmap, bdev); |
c66ac9db NB |
404 | } |
405 | ||
de103c93 | 406 | static sense_reason_t |
f6970ad3 | 407 | iblock_execute_write_same_unmap(struct se_cmd *cmd) |
6f974e8c | 408 | { |
dbc21c5a AH |
409 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
410 | sector_t lba = cmd->t_task_lba; | |
411 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
412 | int ret; | |
413 | ||
414 | ret = iblock_do_unmap(cmd, bdev, lba, nolb); | |
415 | if (ret) | |
416 | return ret; | |
6f974e8c CH |
417 | |
418 | target_complete_cmd(cmd, GOOD); | |
419 | return 0; | |
420 | } | |
421 | ||
f6970ad3 NB |
422 | static sense_reason_t |
423 | iblock_execute_write_same(struct se_cmd *cmd) | |
424 | { | |
425 | struct iblock_req *ibr; | |
426 | struct scatterlist *sg; | |
427 | struct bio *bio; | |
428 | struct bio_list list; | |
429 | sector_t block_lba = cmd->t_task_lba; | |
972b29c8 | 430 | sector_t sectors = sbc_get_write_same_sectors(cmd); |
f6970ad3 NB |
431 | |
432 | sg = &cmd->t_data_sg[0]; | |
433 | ||
434 | if (cmd->t_data_nents > 1 || | |
435 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
436 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
437 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
438 | cmd->se_dev->dev_attrib.block_size); | |
439 | return TCM_INVALID_CDB_FIELD; | |
440 | } | |
441 | ||
442 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
443 | if (!ibr) | |
444 | goto fail; | |
445 | cmd->priv = ibr; | |
446 | ||
447 | bio = iblock_get_bio(cmd, block_lba, 1); | |
448 | if (!bio) | |
449 | goto fail_free_ibr; | |
450 | ||
451 | bio_list_init(&list); | |
452 | bio_list_add(&list, bio); | |
453 | ||
454 | atomic_set(&ibr->pending, 1); | |
455 | ||
456 | while (sectors) { | |
457 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
458 | != sg->length) { | |
459 | ||
460 | bio = iblock_get_bio(cmd, block_lba, 1); | |
461 | if (!bio) | |
462 | goto fail_put_bios; | |
463 | ||
464 | atomic_inc(&ibr->pending); | |
465 | bio_list_add(&list, bio); | |
466 | } | |
467 | ||
468 | /* Always in 512 byte units for Linux/Block */ | |
469 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
470 | sectors -= 1; | |
471 | } | |
472 | ||
473 | iblock_submit_bios(&list, WRITE); | |
474 | return 0; | |
475 | ||
476 | fail_put_bios: | |
477 | while ((bio = bio_list_pop(&list))) | |
478 | bio_put(bio); | |
479 | fail_free_ibr: | |
480 | kfree(ibr); | |
481 | fail: | |
482 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
483 | } | |
484 | ||
c66ac9db | 485 | enum { |
44bfd018 | 486 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
487 | }; |
488 | ||
489 | static match_table_t tokens = { | |
490 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 491 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
492 | {Opt_force, "force=%d"}, |
493 | {Opt_err, NULL} | |
494 | }; | |
495 | ||
0fd97ccf CH |
496 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
497 | const char *page, ssize_t count) | |
c66ac9db | 498 | { |
0fd97ccf | 499 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 500 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 501 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 502 | int ret = 0, token; |
44bfd018 | 503 | unsigned long tmp_readonly; |
c66ac9db NB |
504 | |
505 | opts = kstrdup(page, GFP_KERNEL); | |
506 | if (!opts) | |
507 | return -ENOMEM; | |
508 | ||
509 | orig = opts; | |
510 | ||
90c161b6 | 511 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
512 | if (!*ptr) |
513 | continue; | |
514 | ||
515 | token = match_token(ptr, tokens, args); | |
516 | switch (token) { | |
517 | case Opt_udev_path: | |
518 | if (ib_dev->ibd_bd) { | |
6708bb27 | 519 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
520 | " ib_dev->ibd_bd exists\n"); |
521 | ret = -EEXIST; | |
522 | goto out; | |
523 | } | |
852b6ed1 NB |
524 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
525 | SE_UDEV_PATH_LEN) == 0) { | |
526 | ret = -EINVAL; | |
6d180253 JJ |
527 | break; |
528 | } | |
6708bb27 | 529 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
530 | ib_dev->ibd_udev_path); |
531 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
532 | break; | |
44bfd018 AG |
533 | case Opt_readonly: |
534 | arg_p = match_strdup(&args[0]); | |
535 | if (!arg_p) { | |
536 | ret = -ENOMEM; | |
537 | break; | |
538 | } | |
57103d7f | 539 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
540 | kfree(arg_p); |
541 | if (ret < 0) { | |
57103d7f | 542 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
543 | " readonly=\n"); |
544 | goto out; | |
545 | } | |
546 | ib_dev->ibd_readonly = tmp_readonly; | |
547 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
548 | break; | |
c66ac9db | 549 | case Opt_force: |
c66ac9db NB |
550 | break; |
551 | default: | |
552 | break; | |
553 | } | |
554 | } | |
555 | ||
556 | out: | |
557 | kfree(orig); | |
558 | return (!ret) ? count : ret; | |
559 | } | |
560 | ||
0fd97ccf | 561 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 562 | { |
0fd97ccf CH |
563 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
564 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
565 | char buf[BDEVNAME_SIZE]; |
566 | ssize_t bl = 0; | |
567 | ||
568 | if (bd) | |
569 | bl += sprintf(b + bl, "iBlock device: %s", | |
570 | bdevname(bd, buf)); | |
0fd97ccf | 571 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 572 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
573 | ib_dev->ibd_udev_path); |
574 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
575 | |
576 | bl += sprintf(b + bl, " "); | |
577 | if (bd) { | |
578 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 579 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 580 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
581 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
582 | } else { | |
21bca31c | 583 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
584 | } |
585 | ||
586 | return bl; | |
587 | } | |
588 | ||
de103c93 | 589 | static sense_reason_t |
a82a9538 NB |
590 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
591 | enum dma_data_direction data_direction) | |
c66ac9db | 592 | { |
5951146d | 593 | struct se_device *dev = cmd->se_dev; |
5787cacd | 594 | struct iblock_req *ibr; |
dbbf3e94 CH |
595 | struct bio *bio; |
596 | struct bio_list list; | |
c66ac9db | 597 | struct scatterlist *sg; |
5787cacd | 598 | u32 sg_num = sgl_nents; |
c66ac9db | 599 | sector_t block_lba; |
d5b4a21b | 600 | unsigned bio_cnt; |
d0c8b259 | 601 | int rw = 0; |
5787cacd | 602 | int i; |
dbbf3e94 | 603 | |
5787cacd | 604 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
605 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
606 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 607 | /* |
d0c8b259 NB |
608 | * Force writethrough using WRITE_FUA if a volatile write cache |
609 | * is not enabled, or if initiator set the Force Unit Access bit. | |
dbbf3e94 | 610 | */ |
d0c8b259 NB |
611 | if (q->flush_flags & REQ_FUA) { |
612 | if (cmd->se_cmd_flags & SCF_FUA) | |
613 | rw = WRITE_FUA; | |
614 | else if (!(q->flush_flags & REQ_FLUSH)) | |
615 | rw = WRITE_FUA; | |
d2bdbee0 NB |
616 | else |
617 | rw = WRITE; | |
d0c8b259 | 618 | } else { |
dbbf3e94 | 619 | rw = WRITE; |
d0c8b259 | 620 | } |
dbbf3e94 CH |
621 | } else { |
622 | rw = READ; | |
623 | } | |
624 | ||
c66ac9db | 625 | /* |
5787cacd CH |
626 | * Convert the blocksize advertised to the initiator to the 512 byte |
627 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 628 | */ |
0fd97ccf | 629 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 630 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 631 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 632 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 633 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 634 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 635 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 636 | block_lba = cmd->t_task_lba; |
c66ac9db | 637 | else { |
6708bb27 | 638 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 639 | " %u\n", dev->dev_attrib.block_size); |
de103c93 | 640 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
641 | } |
642 | ||
5787cacd CH |
643 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
644 | if (!ibr) | |
645 | goto fail; | |
646 | cmd->priv = ibr; | |
647 | ||
e0de4457 PB |
648 | if (!sgl_nents) { |
649 | atomic_set(&ibr->pending, 1); | |
650 | iblock_complete_cmd(cmd); | |
651 | return 0; | |
652 | } | |
653 | ||
5787cacd CH |
654 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
655 | if (!bio) | |
656 | goto fail_free_ibr; | |
dbbf3e94 CH |
657 | |
658 | bio_list_init(&list); | |
659 | bio_list_add(&list, bio); | |
5787cacd CH |
660 | |
661 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 662 | bio_cnt = 1; |
c66ac9db | 663 | |
5787cacd | 664 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
665 | /* |
666 | * XXX: if the length the device accepts is shorter than the | |
667 | * length of the S/G list entry this will cause and | |
668 | * endless loop. Better hope no driver uses huge pages. | |
669 | */ | |
670 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
671 | != sg->length) { | |
d5b4a21b CH |
672 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
673 | iblock_submit_bios(&list, rw); | |
674 | bio_cnt = 0; | |
675 | } | |
676 | ||
5787cacd | 677 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 678 | if (!bio) |
5787cacd CH |
679 | goto fail_put_bios; |
680 | ||
681 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 682 | bio_list_add(&list, bio); |
d5b4a21b | 683 | bio_cnt++; |
c66ac9db | 684 | } |
dbbf3e94 | 685 | |
c66ac9db NB |
686 | /* Always in 512 byte units for Linux/Block */ |
687 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
688 | sg_num--; | |
c66ac9db NB |
689 | } |
690 | ||
d5b4a21b | 691 | iblock_submit_bios(&list, rw); |
5787cacd | 692 | iblock_complete_cmd(cmd); |
03e98c9e | 693 | return 0; |
dbbf3e94 | 694 | |
5787cacd | 695 | fail_put_bios: |
dbbf3e94 | 696 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 697 | bio_put(bio); |
5787cacd CH |
698 | fail_free_ibr: |
699 | kfree(ibr); | |
5787cacd | 700 | fail: |
de103c93 | 701 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
702 | } |
703 | ||
c66ac9db NB |
704 | static sector_t iblock_get_blocks(struct se_device *dev) |
705 | { | |
0fd97ccf CH |
706 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
707 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
708 | struct request_queue *q = bdev_get_queue(bd); |
709 | ||
710 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
711 | } | |
712 | ||
7f7caf6a AG |
713 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
714 | { | |
715 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
716 | struct block_device *bd = ib_dev->ibd_bd; | |
717 | int ret; | |
718 | ||
719 | ret = bdev_alignment_offset(bd); | |
720 | if (ret == -1) | |
721 | return 0; | |
722 | ||
723 | /* convert offset-bytes to offset-lbas */ | |
724 | return ret / bdev_logical_block_size(bd); | |
725 | } | |
726 | ||
727 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
728 | { | |
729 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
730 | struct block_device *bd = ib_dev->ibd_bd; | |
731 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
732 | ||
733 | return ilog2(logs_per_phys); | |
734 | } | |
735 | ||
736 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
737 | { | |
738 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
739 | struct block_device *bd = ib_dev->ibd_bd; | |
740 | ||
741 | return bdev_io_min(bd); | |
742 | } | |
743 | ||
744 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
745 | { | |
746 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
747 | struct block_device *bd = ib_dev->ibd_bd; | |
748 | ||
749 | return bdev_io_opt(bd); | |
750 | } | |
751 | ||
9e999a6c | 752 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 753 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 754 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 755 | .execute_write_same = iblock_execute_write_same, |
f6970ad3 | 756 | .execute_write_same_unmap = iblock_execute_write_same_unmap, |
14150a6b | 757 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
758 | }; |
759 | ||
de103c93 CH |
760 | static sense_reason_t |
761 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 762 | { |
9e999a6c | 763 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
764 | } |
765 | ||
d0c8b259 NB |
766 | bool iblock_get_write_cache(struct se_device *dev) |
767 | { | |
768 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
769 | struct block_device *bd = ib_dev->ibd_bd; | |
770 | struct request_queue *q = bdev_get_queue(bd); | |
771 | ||
772 | return q->flush_flags & REQ_FLUSH; | |
773 | } | |
774 | ||
c66ac9db NB |
775 | static struct se_subsystem_api iblock_template = { |
776 | .name = "iblock", | |
0fd97ccf CH |
777 | .inquiry_prod = "IBLOCK", |
778 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db NB |
779 | .owner = THIS_MODULE, |
780 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
c66ac9db NB |
781 | .attach_hba = iblock_attach_hba, |
782 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
783 | .alloc_device = iblock_alloc_device, |
784 | .configure_device = iblock_configure_device, | |
c66ac9db | 785 | .free_device = iblock_free_device, |
0c2ad7d1 | 786 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
787 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
788 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 789 | .get_device_type = sbc_get_device_type, |
c66ac9db | 790 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
791 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
792 | .get_lbppbe = iblock_get_lbppbe, | |
793 | .get_io_min = iblock_get_io_min, | |
794 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 795 | .get_write_cache = iblock_get_write_cache, |
c66ac9db NB |
796 | }; |
797 | ||
798 | static int __init iblock_module_init(void) | |
799 | { | |
800 | return transport_subsystem_register(&iblock_template); | |
801 | } | |
802 | ||
63b91d5a | 803 | static void __exit iblock_module_exit(void) |
c66ac9db NB |
804 | { |
805 | transport_subsystem_release(&iblock_template); | |
806 | } | |
807 | ||
808 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
809 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
810 | MODULE_LICENSE("GPL"); | |
811 | ||
812 | module_init(iblock_module_init); | |
813 | module_exit(iblock_module_exit); |