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> |
ba929992 | 38 | #include <scsi/scsi_proto.h> |
14150a6b | 39 | #include <asm/unaligned.h> |
c66ac9db NB |
40 | |
41 | #include <target/target_core_base.h> | |
c4795fb2 | 42 | #include <target/target_core_backend.h> |
c66ac9db NB |
43 | |
44 | #include "target_core_iblock.h" | |
45 | ||
d5b4a21b CH |
46 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
47 | #define IBLOCK_BIO_POOL_SIZE 128 | |
48 | ||
0fd97ccf CH |
49 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
50 | { | |
51 | return container_of(dev, struct iblock_dev, dev); | |
52 | } | |
53 | ||
54 | ||
c66ac9db NB |
55 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
56 | { | |
6708bb27 | 57 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db | 58 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 59 | IBLOCK_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
60 | return 0; |
61 | } | |
62 | ||
63 | static void iblock_detach_hba(struct se_hba *hba) | |
64 | { | |
c66ac9db NB |
65 | } |
66 | ||
0fd97ccf | 67 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
68 | { |
69 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
70 | |
71 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
72 | if (!ib_dev) { |
73 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
74 | return NULL; |
75 | } | |
c66ac9db | 76 | |
6708bb27 | 77 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 78 | |
0fd97ccf | 79 | return &ib_dev->dev; |
c66ac9db NB |
80 | } |
81 | ||
0fd97ccf | 82 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 83 | { |
0fd97ccf | 84 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 85 | struct request_queue *q; |
0fd97ccf | 86 | struct block_device *bd = NULL; |
ecebbf6c | 87 | struct blk_integrity *bi; |
44bfd018 | 88 | fmode_t mode; |
0fd97ccf | 89 | int ret = -ENOMEM; |
c66ac9db | 90 | |
0fd97ccf CH |
91 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
92 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
93 | return -EINVAL; | |
c66ac9db | 94 | } |
d5b4a21b CH |
95 | |
96 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 97 | if (!ib_dev->ibd_bio_set) { |
0fd97ccf CH |
98 | pr_err("IBLOCK: Unable to create bioset\n"); |
99 | goto out; | |
c66ac9db | 100 | } |
0fd97ccf | 101 | |
6708bb27 | 102 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
103 | ib_dev->ibd_udev_path); |
104 | ||
44bfd018 AG |
105 | mode = FMODE_READ|FMODE_EXCL; |
106 | if (!ib_dev->ibd_readonly) | |
107 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
108 | else |
109 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
110 | |
111 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
112 | if (IS_ERR(bd)) { |
113 | ret = PTR_ERR(bd); | |
0fd97ccf | 114 | goto out_free_bioset; |
613640e4 | 115 | } |
c66ac9db NB |
116 | ib_dev->ibd_bd = bd; |
117 | ||
0fd97ccf CH |
118 | q = bdev_get_queue(bd); |
119 | ||
120 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
046ba642 | 121 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
0fd97ccf | 122 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 123 | |
c66ac9db NB |
124 | /* |
125 | * Check if the underlying struct block_device request_queue supports | |
126 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
127 | * in ATA and we need to set TPE=1 | |
128 | */ | |
613640e4 | 129 | if (blk_queue_discard(q)) { |
0fd97ccf | 130 | dev->dev_attrib.max_unmap_lba_count = |
c66ac9db | 131 | q->limits.max_discard_sectors; |
0fd97ccf | 132 | |
c66ac9db NB |
133 | /* |
134 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
135 | */ | |
0fd97ccf CH |
136 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
137 | dev->dev_attrib.unmap_granularity = | |
7347b5ff | 138 | q->limits.discard_granularity >> 9; |
0fd97ccf | 139 | dev->dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
140 | q->limits.discard_alignment; |
141 | ||
6708bb27 | 142 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
143 | " disabled by default\n"); |
144 | } | |
f6970ad3 NB |
145 | /* |
146 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
147 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
148 | */ | |
149 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 150 | |
e22a7f07 | 151 | if (blk_queue_nonrot(q)) |
0fd97ccf | 152 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 153 | |
ecebbf6c NB |
154 | bi = bdev_get_integrity(bd); |
155 | if (bi) { | |
156 | struct bio_set *bs = ib_dev->ibd_bio_set; | |
157 | ||
158 | if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") || | |
159 | !strcmp(bi->name, "T10-DIF-TYPE1-IP")) { | |
160 | pr_err("IBLOCK export of blk_integrity: %s not" | |
161 | " supported\n", bi->name); | |
162 | ret = -ENOSYS; | |
163 | goto out_blkdev_put; | |
164 | } | |
165 | ||
166 | if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) { | |
167 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; | |
168 | } else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) { | |
169 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; | |
170 | } | |
171 | ||
172 | if (dev->dev_attrib.pi_prot_type) { | |
173 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
174 | pr_err("Unable to allocate bioset for PI\n"); | |
175 | ret = -ENOMEM; | |
176 | goto out_blkdev_put; | |
177 | } | |
178 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
179 | bs->bio_integrity_pool); | |
180 | } | |
181 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
182 | } | |
183 | ||
0fd97ccf | 184 | return 0; |
c66ac9db | 185 | |
ecebbf6c NB |
186 | out_blkdev_put: |
187 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf CH |
188 | out_free_bioset: |
189 | bioset_free(ib_dev->ibd_bio_set); | |
190 | ib_dev->ibd_bio_set = NULL; | |
191 | out: | |
192 | return ret; | |
c66ac9db NB |
193 | } |
194 | ||
4cc987ea NB |
195 | static void iblock_dev_call_rcu(struct rcu_head *p) |
196 | { | |
197 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
198 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
199 | ||
200 | kfree(ib_dev); | |
201 | } | |
202 | ||
0fd97ccf | 203 | static void iblock_free_device(struct se_device *dev) |
c66ac9db | 204 | { |
0fd97ccf | 205 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 206 | |
bc665524 NB |
207 | if (ib_dev->ibd_bd != NULL) |
208 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
d84287bc | 209 | if (ib_dev->ibd_bio_set != NULL) |
bc665524 | 210 | bioset_free(ib_dev->ibd_bio_set); |
d84287bc | 211 | |
4cc987ea | 212 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); |
c66ac9db NB |
213 | } |
214 | ||
c66ac9db NB |
215 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
216 | struct se_device *dev, | |
217 | struct block_device *bd, | |
218 | struct request_queue *q) | |
219 | { | |
220 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
221 | bdev_logical_block_size(bd)) - 1); | |
222 | u32 block_size = bdev_logical_block_size(bd); | |
223 | ||
0fd97ccf | 224 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
225 | return blocks_long; |
226 | ||
227 | switch (block_size) { | |
228 | case 4096: | |
0fd97ccf | 229 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
230 | case 2048: |
231 | blocks_long <<= 1; | |
232 | break; | |
233 | case 1024: | |
234 | blocks_long <<= 2; | |
235 | break; | |
236 | case 512: | |
237 | blocks_long <<= 3; | |
238 | default: | |
239 | break; | |
240 | } | |
241 | break; | |
242 | case 2048: | |
0fd97ccf | 243 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
244 | case 4096: |
245 | blocks_long >>= 1; | |
246 | break; | |
247 | case 1024: | |
248 | blocks_long <<= 1; | |
249 | break; | |
250 | case 512: | |
251 | blocks_long <<= 2; | |
252 | break; | |
253 | default: | |
254 | break; | |
255 | } | |
256 | break; | |
257 | case 1024: | |
0fd97ccf | 258 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
259 | case 4096: |
260 | blocks_long >>= 2; | |
261 | break; | |
262 | case 2048: | |
263 | blocks_long >>= 1; | |
264 | break; | |
265 | case 512: | |
266 | blocks_long <<= 1; | |
267 | break; | |
268 | default: | |
269 | break; | |
270 | } | |
271 | break; | |
272 | case 512: | |
0fd97ccf | 273 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
274 | case 4096: |
275 | blocks_long >>= 3; | |
276 | break; | |
277 | case 2048: | |
278 | blocks_long >>= 2; | |
279 | break; | |
280 | case 1024: | |
281 | blocks_long >>= 1; | |
282 | break; | |
283 | default: | |
284 | break; | |
285 | } | |
286 | break; | |
287 | default: | |
288 | break; | |
289 | } | |
290 | ||
291 | return blocks_long; | |
292 | } | |
293 | ||
3a41d85f NB |
294 | static void iblock_complete_cmd(struct se_cmd *cmd) |
295 | { | |
296 | struct iblock_req *ibr = cmd->priv; | |
297 | u8 status; | |
298 | ||
299 | if (!atomic_dec_and_test(&ibr->pending)) | |
300 | return; | |
301 | ||
302 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
303 | status = SAM_STAT_CHECK_CONDITION; | |
304 | else | |
305 | status = SAM_STAT_GOOD; | |
306 | ||
307 | target_complete_cmd(cmd, status); | |
308 | kfree(ibr); | |
309 | } | |
310 | ||
4246a0b6 | 311 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
312 | { |
313 | struct se_cmd *cmd = bio->bi_private; | |
314 | struct iblock_req *ibr = cmd->priv; | |
315 | ||
4246a0b6 CH |
316 | if (bio->bi_error) { |
317 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_error); | |
3a41d85f NB |
318 | /* |
319 | * Bump the ib_bio_err_cnt and release bio. | |
320 | */ | |
321 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 322 | smp_mb__after_atomic(); |
3a41d85f NB |
323 | } |
324 | ||
325 | bio_put(bio); | |
326 | ||
327 | iblock_complete_cmd(cmd); | |
328 | } | |
329 | ||
330 | static struct bio * | |
331 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
332 | { | |
333 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
334 | struct bio *bio; | |
335 | ||
336 | /* | |
337 | * Only allocate as many vector entries as the bio code allows us to, | |
338 | * we'll loop later on until we have handled the whole request. | |
339 | */ | |
340 | if (sg_num > BIO_MAX_PAGES) | |
341 | sg_num = BIO_MAX_PAGES; | |
342 | ||
343 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
344 | if (!bio) { | |
345 | pr_err("Unable to allocate memory for bio\n"); | |
346 | return NULL; | |
347 | } | |
348 | ||
349 | bio->bi_bdev = ib_dev->ibd_bd; | |
350 | bio->bi_private = cmd; | |
351 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 352 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
353 | |
354 | return bio; | |
355 | } | |
356 | ||
357 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
358 | { | |
359 | struct blk_plug plug; | |
360 | struct bio *bio; | |
361 | ||
362 | blk_start_plug(&plug); | |
363 | while ((bio = bio_list_pop(list))) | |
364 | submit_bio(rw, bio); | |
365 | blk_finish_plug(&plug); | |
366 | } | |
367 | ||
4246a0b6 | 368 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
369 | { |
370 | struct se_cmd *cmd = bio->bi_private; | |
371 | ||
4246a0b6 CH |
372 | if (bio->bi_error) |
373 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_error); | |
df5fa691 | 374 | |
5787cacd | 375 | if (cmd) { |
4246a0b6 | 376 | if (bio->bi_error) |
5787cacd | 377 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 378 | else |
5787cacd | 379 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
380 | } |
381 | ||
df5fa691 CH |
382 | bio_put(bio); |
383 | } | |
384 | ||
c66ac9db | 385 | /* |
df5fa691 CH |
386 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
387 | * always flush the whole cache. | |
c66ac9db | 388 | */ |
de103c93 CH |
389 | static sense_reason_t |
390 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 391 | { |
0fd97ccf | 392 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 393 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 394 | struct bio *bio; |
c66ac9db NB |
395 | |
396 | /* | |
397 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 398 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
399 | */ |
400 | if (immed) | |
5787cacd | 401 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 402 | |
df5fa691 CH |
403 | bio = bio_alloc(GFP_KERNEL, 0); |
404 | bio->bi_end_io = iblock_end_io_flush; | |
405 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 406 | if (!immed) |
df5fa691 CH |
407 | bio->bi_private = cmd; |
408 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 409 | return 0; |
c66ac9db NB |
410 | } |
411 | ||
dbc21c5a | 412 | static sense_reason_t |
62e46942 | 413 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 414 | { |
62e46942 | 415 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
dbc21c5a AH |
416 | int ret; |
417 | ||
418 | ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0); | |
419 | if (ret < 0) { | |
420 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
421 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
f6970ad3 NB |
427 | static sense_reason_t |
428 | iblock_execute_write_same(struct se_cmd *cmd) | |
429 | { | |
430 | struct iblock_req *ibr; | |
431 | struct scatterlist *sg; | |
432 | struct bio *bio; | |
433 | struct bio_list list; | |
434 | sector_t block_lba = cmd->t_task_lba; | |
972b29c8 | 435 | sector_t sectors = sbc_get_write_same_sectors(cmd); |
f6970ad3 | 436 | |
afd73f1b NB |
437 | if (cmd->prot_op) { |
438 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
439 | " backends not supported\n"); | |
440 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
441 | } | |
f6970ad3 NB |
442 | sg = &cmd->t_data_sg[0]; |
443 | ||
444 | if (cmd->t_data_nents > 1 || | |
445 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
446 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
447 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
448 | cmd->se_dev->dev_attrib.block_size); | |
449 | return TCM_INVALID_CDB_FIELD; | |
450 | } | |
451 | ||
452 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
453 | if (!ibr) | |
454 | goto fail; | |
455 | cmd->priv = ibr; | |
456 | ||
457 | bio = iblock_get_bio(cmd, block_lba, 1); | |
458 | if (!bio) | |
459 | goto fail_free_ibr; | |
460 | ||
461 | bio_list_init(&list); | |
462 | bio_list_add(&list, bio); | |
463 | ||
464 | atomic_set(&ibr->pending, 1); | |
465 | ||
466 | while (sectors) { | |
467 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
468 | != sg->length) { | |
469 | ||
470 | bio = iblock_get_bio(cmd, block_lba, 1); | |
471 | if (!bio) | |
472 | goto fail_put_bios; | |
473 | ||
474 | atomic_inc(&ibr->pending); | |
475 | bio_list_add(&list, bio); | |
476 | } | |
477 | ||
478 | /* Always in 512 byte units for Linux/Block */ | |
479 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
480 | sectors -= 1; | |
481 | } | |
482 | ||
483 | iblock_submit_bios(&list, WRITE); | |
484 | return 0; | |
485 | ||
486 | fail_put_bios: | |
487 | while ((bio = bio_list_pop(&list))) | |
488 | bio_put(bio); | |
489 | fail_free_ibr: | |
490 | kfree(ibr); | |
491 | fail: | |
492 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
493 | } | |
494 | ||
c66ac9db | 495 | enum { |
44bfd018 | 496 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
497 | }; |
498 | ||
499 | static match_table_t tokens = { | |
500 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 501 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
502 | {Opt_force, "force=%d"}, |
503 | {Opt_err, NULL} | |
504 | }; | |
505 | ||
0fd97ccf CH |
506 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
507 | const char *page, ssize_t count) | |
c66ac9db | 508 | { |
0fd97ccf | 509 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 510 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 511 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 512 | int ret = 0, token; |
44bfd018 | 513 | unsigned long tmp_readonly; |
c66ac9db NB |
514 | |
515 | opts = kstrdup(page, GFP_KERNEL); | |
516 | if (!opts) | |
517 | return -ENOMEM; | |
518 | ||
519 | orig = opts; | |
520 | ||
90c161b6 | 521 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
522 | if (!*ptr) |
523 | continue; | |
524 | ||
525 | token = match_token(ptr, tokens, args); | |
526 | switch (token) { | |
527 | case Opt_udev_path: | |
528 | if (ib_dev->ibd_bd) { | |
6708bb27 | 529 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
530 | " ib_dev->ibd_bd exists\n"); |
531 | ret = -EEXIST; | |
532 | goto out; | |
533 | } | |
852b6ed1 NB |
534 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
535 | SE_UDEV_PATH_LEN) == 0) { | |
536 | ret = -EINVAL; | |
6d180253 JJ |
537 | break; |
538 | } | |
6708bb27 | 539 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
540 | ib_dev->ibd_udev_path); |
541 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
542 | break; | |
44bfd018 AG |
543 | case Opt_readonly: |
544 | arg_p = match_strdup(&args[0]); | |
545 | if (!arg_p) { | |
546 | ret = -ENOMEM; | |
547 | break; | |
548 | } | |
57103d7f | 549 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
550 | kfree(arg_p); |
551 | if (ret < 0) { | |
57103d7f | 552 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
553 | " readonly=\n"); |
554 | goto out; | |
555 | } | |
556 | ib_dev->ibd_readonly = tmp_readonly; | |
557 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
558 | break; | |
c66ac9db | 559 | case Opt_force: |
c66ac9db NB |
560 | break; |
561 | default: | |
562 | break; | |
563 | } | |
564 | } | |
565 | ||
566 | out: | |
567 | kfree(orig); | |
568 | return (!ret) ? count : ret; | |
569 | } | |
570 | ||
0fd97ccf | 571 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 572 | { |
0fd97ccf CH |
573 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
574 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
575 | char buf[BDEVNAME_SIZE]; |
576 | ssize_t bl = 0; | |
577 | ||
578 | if (bd) | |
579 | bl += sprintf(b + bl, "iBlock device: %s", | |
580 | bdevname(bd, buf)); | |
0fd97ccf | 581 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 582 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
583 | ib_dev->ibd_udev_path); |
584 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
585 | |
586 | bl += sprintf(b + bl, " "); | |
587 | if (bd) { | |
588 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 589 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 590 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
591 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
592 | } else { | |
21bca31c | 593 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
594 | } |
595 | ||
596 | return bl; | |
597 | } | |
598 | ||
ecebbf6c NB |
599 | static int |
600 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) | |
601 | { | |
602 | struct se_device *dev = cmd->se_dev; | |
603 | struct blk_integrity *bi; | |
604 | struct bio_integrity_payload *bip; | |
605 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
606 | struct scatterlist *sg; | |
607 | int i, rc; | |
608 | ||
609 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
610 | if (!bi) { | |
611 | pr_err("Unable to locate bio_integrity\n"); | |
612 | return -ENODEV; | |
613 | } | |
614 | ||
615 | bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); | |
616 | if (!bip) { | |
617 | pr_err("Unable to allocate bio_integrity_payload\n"); | |
618 | return -ENOMEM; | |
619 | } | |
620 | ||
4e13c5d0 | 621 | bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
ecebbf6c | 622 | dev->prot_length; |
4e13c5d0 | 623 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
ecebbf6c | 624 | |
4e13c5d0 LT |
625 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
626 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c NB |
627 | |
628 | for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { | |
629 | ||
630 | rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, | |
631 | sg->offset); | |
632 | if (rc != sg->length) { | |
633 | pr_err("bio_integrity_add_page() failed; %d\n", rc); | |
634 | return -ENOMEM; | |
635 | } | |
636 | ||
637 | pr_debug("Added bio integrity page: %p length: %d offset; %d\n", | |
638 | sg_page(sg), sg->length, sg->offset); | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
de103c93 | 644 | static sense_reason_t |
a82a9538 NB |
645 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
646 | enum dma_data_direction data_direction) | |
c66ac9db | 647 | { |
5951146d | 648 | struct se_device *dev = cmd->se_dev; |
5787cacd | 649 | struct iblock_req *ibr; |
ecebbf6c | 650 | struct bio *bio, *bio_start; |
dbbf3e94 | 651 | struct bio_list list; |
c66ac9db | 652 | struct scatterlist *sg; |
5787cacd | 653 | u32 sg_num = sgl_nents; |
c66ac9db | 654 | sector_t block_lba; |
d5b4a21b | 655 | unsigned bio_cnt; |
d0c8b259 | 656 | int rw = 0; |
5787cacd | 657 | int i; |
dbbf3e94 | 658 | |
5787cacd | 659 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
660 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
661 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 662 | /* |
d0c8b259 NB |
663 | * Force writethrough using WRITE_FUA if a volatile write cache |
664 | * is not enabled, or if initiator set the Force Unit Access bit. | |
dbbf3e94 | 665 | */ |
d0c8b259 NB |
666 | if (q->flush_flags & REQ_FUA) { |
667 | if (cmd->se_cmd_flags & SCF_FUA) | |
668 | rw = WRITE_FUA; | |
669 | else if (!(q->flush_flags & REQ_FLUSH)) | |
670 | rw = WRITE_FUA; | |
d2bdbee0 NB |
671 | else |
672 | rw = WRITE; | |
d0c8b259 | 673 | } else { |
dbbf3e94 | 674 | rw = WRITE; |
d0c8b259 | 675 | } |
dbbf3e94 CH |
676 | } else { |
677 | rw = READ; | |
678 | } | |
679 | ||
c66ac9db | 680 | /* |
5787cacd CH |
681 | * Convert the blocksize advertised to the initiator to the 512 byte |
682 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 683 | */ |
0fd97ccf | 684 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 685 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 686 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 687 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 688 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 689 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 690 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 691 | block_lba = cmd->t_task_lba; |
c66ac9db | 692 | else { |
6708bb27 | 693 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 694 | " %u\n", dev->dev_attrib.block_size); |
de103c93 | 695 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
696 | } |
697 | ||
5787cacd CH |
698 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
699 | if (!ibr) | |
700 | goto fail; | |
701 | cmd->priv = ibr; | |
702 | ||
e0de4457 PB |
703 | if (!sgl_nents) { |
704 | atomic_set(&ibr->pending, 1); | |
705 | iblock_complete_cmd(cmd); | |
706 | return 0; | |
707 | } | |
708 | ||
5787cacd CH |
709 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
710 | if (!bio) | |
711 | goto fail_free_ibr; | |
dbbf3e94 | 712 | |
ecebbf6c | 713 | bio_start = bio; |
dbbf3e94 CH |
714 | bio_list_init(&list); |
715 | bio_list_add(&list, bio); | |
5787cacd CH |
716 | |
717 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 718 | bio_cnt = 1; |
c66ac9db | 719 | |
5787cacd | 720 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
721 | /* |
722 | * XXX: if the length the device accepts is shorter than the | |
723 | * length of the S/G list entry this will cause and | |
724 | * endless loop. Better hope no driver uses huge pages. | |
725 | */ | |
726 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
727 | != sg->length) { | |
d5b4a21b CH |
728 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
729 | iblock_submit_bios(&list, rw); | |
730 | bio_cnt = 0; | |
731 | } | |
732 | ||
5787cacd | 733 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 734 | if (!bio) |
5787cacd CH |
735 | goto fail_put_bios; |
736 | ||
737 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 738 | bio_list_add(&list, bio); |
d5b4a21b | 739 | bio_cnt++; |
c66ac9db | 740 | } |
dbbf3e94 | 741 | |
c66ac9db NB |
742 | /* Always in 512 byte units for Linux/Block */ |
743 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
744 | sg_num--; | |
c66ac9db NB |
745 | } |
746 | ||
6f16ec43 | 747 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
ecebbf6c NB |
748 | int rc = iblock_alloc_bip(cmd, bio_start); |
749 | if (rc) | |
750 | goto fail_put_bios; | |
751 | } | |
752 | ||
d5b4a21b | 753 | iblock_submit_bios(&list, rw); |
5787cacd | 754 | iblock_complete_cmd(cmd); |
03e98c9e | 755 | return 0; |
dbbf3e94 | 756 | |
5787cacd | 757 | fail_put_bios: |
dbbf3e94 | 758 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 759 | bio_put(bio); |
5787cacd CH |
760 | fail_free_ibr: |
761 | kfree(ibr); | |
5787cacd | 762 | fail: |
de103c93 | 763 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
764 | } |
765 | ||
c66ac9db NB |
766 | static sector_t iblock_get_blocks(struct se_device *dev) |
767 | { | |
0fd97ccf CH |
768 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
769 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
770 | struct request_queue *q = bdev_get_queue(bd); |
771 | ||
772 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
773 | } | |
774 | ||
7f7caf6a AG |
775 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
776 | { | |
777 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
778 | struct block_device *bd = ib_dev->ibd_bd; | |
779 | int ret; | |
780 | ||
781 | ret = bdev_alignment_offset(bd); | |
782 | if (ret == -1) | |
783 | return 0; | |
784 | ||
785 | /* convert offset-bytes to offset-lbas */ | |
786 | return ret / bdev_logical_block_size(bd); | |
787 | } | |
788 | ||
789 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
790 | { | |
791 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
792 | struct block_device *bd = ib_dev->ibd_bd; | |
793 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
794 | ||
795 | return ilog2(logs_per_phys); | |
796 | } | |
797 | ||
798 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
799 | { | |
800 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
801 | struct block_device *bd = ib_dev->ibd_bd; | |
802 | ||
803 | return bdev_io_min(bd); | |
804 | } | |
805 | ||
806 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
807 | { | |
808 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
809 | struct block_device *bd = ib_dev->ibd_bd; | |
810 | ||
811 | return bdev_io_opt(bd); | |
812 | } | |
813 | ||
9e999a6c | 814 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 815 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 816 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 817 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 818 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
819 | }; |
820 | ||
de103c93 CH |
821 | static sense_reason_t |
822 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 823 | { |
9e999a6c | 824 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
825 | } |
826 | ||
452e2010 | 827 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
828 | { |
829 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
830 | struct block_device *bd = ib_dev->ibd_bd; | |
831 | struct request_queue *q = bdev_get_queue(bd); | |
832 | ||
833 | return q->flush_flags & REQ_FLUSH; | |
834 | } | |
835 | ||
0a06d430 | 836 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 837 | .name = "iblock", |
0fd97ccf CH |
838 | .inquiry_prod = "IBLOCK", |
839 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 840 | .owner = THIS_MODULE, |
c66ac9db NB |
841 | .attach_hba = iblock_attach_hba, |
842 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
843 | .alloc_device = iblock_alloc_device, |
844 | .configure_device = iblock_configure_device, | |
c66ac9db | 845 | .free_device = iblock_free_device, |
0c2ad7d1 | 846 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
847 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
848 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 849 | .get_device_type = sbc_get_device_type, |
c66ac9db | 850 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
851 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
852 | .get_lbppbe = iblock_get_lbppbe, | |
853 | .get_io_min = iblock_get_io_min, | |
854 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 855 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 856 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
857 | }; |
858 | ||
859 | static int __init iblock_module_init(void) | |
860 | { | |
0a06d430 | 861 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
862 | } |
863 | ||
63b91d5a | 864 | static void __exit iblock_module_exit(void) |
c66ac9db | 865 | { |
0a06d430 | 866 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
867 | } |
868 | ||
869 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
870 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
871 | MODULE_LICENSE("GPL"); | |
872 | ||
873 | module_init(iblock_module_init); | |
874 | module_exit(iblock_module_exit); |