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