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> |
5645cba0 | 44 | #include <target/target_core_backend_configfs.h> |
c66ac9db NB |
45 | |
46 | #include "target_core_iblock.h" | |
47 | ||
d5b4a21b CH |
48 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
49 | #define IBLOCK_BIO_POOL_SIZE 128 | |
50 | ||
0fd97ccf CH |
51 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
52 | { | |
53 | return container_of(dev, struct iblock_dev, dev); | |
54 | } | |
55 | ||
56 | ||
c66ac9db NB |
57 | static struct se_subsystem_api iblock_template; |
58 | ||
c66ac9db NB |
59 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
60 | * | |
61 | * | |
62 | */ | |
63 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
64 | { | |
6708bb27 | 65 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
66 | " Generic Target Core Stack %s\n", hba->hba_id, |
67 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
68 | return 0; |
69 | } | |
70 | ||
71 | static void iblock_detach_hba(struct se_hba *hba) | |
72 | { | |
c66ac9db NB |
73 | } |
74 | ||
0fd97ccf | 75 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
76 | { |
77 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
78 | |
79 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
80 | if (!ib_dev) { |
81 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
82 | return NULL; |
83 | } | |
c66ac9db | 84 | |
6708bb27 | 85 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 86 | |
0fd97ccf | 87 | return &ib_dev->dev; |
c66ac9db NB |
88 | } |
89 | ||
0fd97ccf | 90 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 91 | { |
0fd97ccf | 92 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 93 | struct request_queue *q; |
0fd97ccf | 94 | struct block_device *bd = NULL; |
ecebbf6c | 95 | struct blk_integrity *bi; |
44bfd018 | 96 | fmode_t mode; |
0fd97ccf | 97 | int ret = -ENOMEM; |
c66ac9db | 98 | |
0fd97ccf CH |
99 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
100 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
101 | return -EINVAL; | |
c66ac9db | 102 | } |
d5b4a21b CH |
103 | |
104 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 105 | if (!ib_dev->ibd_bio_set) { |
0fd97ccf CH |
106 | pr_err("IBLOCK: Unable to create bioset\n"); |
107 | goto out; | |
c66ac9db | 108 | } |
0fd97ccf | 109 | |
6708bb27 | 110 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
111 | ib_dev->ibd_udev_path); |
112 | ||
44bfd018 AG |
113 | mode = FMODE_READ|FMODE_EXCL; |
114 | if (!ib_dev->ibd_readonly) | |
115 | mode |= FMODE_WRITE; | |
116 | ||
117 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
118 | if (IS_ERR(bd)) { |
119 | ret = PTR_ERR(bd); | |
0fd97ccf | 120 | goto out_free_bioset; |
613640e4 | 121 | } |
c66ac9db NB |
122 | ib_dev->ibd_bd = bd; |
123 | ||
0fd97ccf CH |
124 | q = bdev_get_queue(bd); |
125 | ||
126 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
127 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
128 | dev->dev_attrib.hw_queue_depth = q->nr_requests; | |
c66ac9db | 129 | |
c66ac9db NB |
130 | /* |
131 | * Check if the underlying struct block_device request_queue supports | |
132 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
133 | * in ATA and we need to set TPE=1 | |
134 | */ | |
613640e4 | 135 | if (blk_queue_discard(q)) { |
0fd97ccf | 136 | dev->dev_attrib.max_unmap_lba_count = |
c66ac9db | 137 | q->limits.max_discard_sectors; |
0fd97ccf | 138 | |
c66ac9db NB |
139 | /* |
140 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
141 | */ | |
0fd97ccf CH |
142 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
143 | dev->dev_attrib.unmap_granularity = | |
7347b5ff | 144 | q->limits.discard_granularity >> 9; |
0fd97ccf | 145 | dev->dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
146 | q->limits.discard_alignment; |
147 | ||
6708bb27 | 148 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
149 | " disabled by default\n"); |
150 | } | |
f6970ad3 NB |
151 | /* |
152 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
153 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
154 | */ | |
155 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 156 | |
e22a7f07 | 157 | if (blk_queue_nonrot(q)) |
0fd97ccf | 158 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 159 | |
ecebbf6c NB |
160 | bi = bdev_get_integrity(bd); |
161 | if (bi) { | |
162 | struct bio_set *bs = ib_dev->ibd_bio_set; | |
163 | ||
164 | if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") || | |
165 | !strcmp(bi->name, "T10-DIF-TYPE1-IP")) { | |
166 | pr_err("IBLOCK export of blk_integrity: %s not" | |
167 | " supported\n", bi->name); | |
168 | ret = -ENOSYS; | |
169 | goto out_blkdev_put; | |
170 | } | |
171 | ||
172 | if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) { | |
173 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; | |
174 | } else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) { | |
175 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; | |
176 | } | |
177 | ||
178 | if (dev->dev_attrib.pi_prot_type) { | |
179 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
180 | pr_err("Unable to allocate bioset for PI\n"); | |
181 | ret = -ENOMEM; | |
182 | goto out_blkdev_put; | |
183 | } | |
184 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
185 | bs->bio_integrity_pool); | |
186 | } | |
187 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
188 | } | |
189 | ||
0fd97ccf | 190 | return 0; |
c66ac9db | 191 | |
ecebbf6c NB |
192 | out_blkdev_put: |
193 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf CH |
194 | out_free_bioset: |
195 | bioset_free(ib_dev->ibd_bio_set); | |
196 | ib_dev->ibd_bio_set = NULL; | |
197 | out: | |
198 | return ret; | |
c66ac9db NB |
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 | |
c66ac9db NB |
210 | kfree(ib_dev); |
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 | ||
309 | static void iblock_bio_done(struct bio *bio, int err) | |
310 | { | |
311 | struct se_cmd *cmd = bio->bi_private; | |
312 | struct iblock_req *ibr = cmd->priv; | |
313 | ||
314 | /* | |
315 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
316 | */ | |
317 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) | |
318 | err = -EIO; | |
319 | ||
320 | if (err != 0) { | |
321 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," | |
322 | " err: %d\n", bio, err); | |
323 | /* | |
324 | * Bump the ib_bio_err_cnt and release bio. | |
325 | */ | |
326 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 327 | smp_mb__after_atomic(); |
3a41d85f NB |
328 | } |
329 | ||
330 | bio_put(bio); | |
331 | ||
332 | iblock_complete_cmd(cmd); | |
333 | } | |
334 | ||
335 | static struct bio * | |
336 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
337 | { | |
338 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
339 | struct bio *bio; | |
340 | ||
341 | /* | |
342 | * Only allocate as many vector entries as the bio code allows us to, | |
343 | * we'll loop later on until we have handled the whole request. | |
344 | */ | |
345 | if (sg_num > BIO_MAX_PAGES) | |
346 | sg_num = BIO_MAX_PAGES; | |
347 | ||
348 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
349 | if (!bio) { | |
350 | pr_err("Unable to allocate memory for bio\n"); | |
351 | return NULL; | |
352 | } | |
353 | ||
354 | bio->bi_bdev = ib_dev->ibd_bd; | |
355 | bio->bi_private = cmd; | |
356 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 357 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
358 | |
359 | return bio; | |
360 | } | |
361 | ||
362 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
363 | { | |
364 | struct blk_plug plug; | |
365 | struct bio *bio; | |
366 | ||
367 | blk_start_plug(&plug); | |
368 | while ((bio = bio_list_pop(list))) | |
369 | submit_bio(rw, bio); | |
370 | blk_finish_plug(&plug); | |
371 | } | |
372 | ||
df5fa691 CH |
373 | static void iblock_end_io_flush(struct bio *bio, int err) |
374 | { | |
375 | struct se_cmd *cmd = bio->bi_private; | |
376 | ||
377 | if (err) | |
378 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
379 | ||
5787cacd | 380 | if (cmd) { |
de103c93 | 381 | if (err) |
5787cacd | 382 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 383 | else |
5787cacd | 384 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
385 | } |
386 | ||
df5fa691 CH |
387 | bio_put(bio); |
388 | } | |
389 | ||
c66ac9db | 390 | /* |
df5fa691 CH |
391 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
392 | * always flush the whole cache. | |
c66ac9db | 393 | */ |
de103c93 CH |
394 | static sense_reason_t |
395 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 396 | { |
0fd97ccf | 397 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 398 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 399 | struct bio *bio; |
c66ac9db NB |
400 | |
401 | /* | |
402 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 403 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
404 | */ |
405 | if (immed) | |
5787cacd | 406 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 407 | |
df5fa691 CH |
408 | bio = bio_alloc(GFP_KERNEL, 0); |
409 | bio->bi_end_io = iblock_end_io_flush; | |
410 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 411 | if (!immed) |
df5fa691 CH |
412 | bio->bi_private = cmd; |
413 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 414 | return 0; |
c66ac9db NB |
415 | } |
416 | ||
dbc21c5a | 417 | static sense_reason_t |
86d71829 | 418 | iblock_do_unmap(struct se_cmd *cmd, void *priv, |
dbc21c5a AH |
419 | sector_t lba, sector_t nolb) |
420 | { | |
86d71829 | 421 | struct block_device *bdev = priv; |
dbc21c5a AH |
422 | int ret; |
423 | ||
424 | ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0); | |
425 | if (ret < 0) { | |
426 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
427 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
de103c93 CH |
433 | static sense_reason_t |
434 | iblock_execute_unmap(struct se_cmd *cmd) | |
c66ac9db | 435 | { |
86d71829 | 436 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
c66ac9db | 437 | |
86d71829 | 438 | return sbc_execute_unmap(cmd, iblock_do_unmap, bdev); |
c66ac9db NB |
439 | } |
440 | ||
de103c93 | 441 | static sense_reason_t |
f6970ad3 | 442 | iblock_execute_write_same_unmap(struct se_cmd *cmd) |
6f974e8c | 443 | { |
dbc21c5a AH |
444 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
445 | sector_t lba = cmd->t_task_lba; | |
446 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
447 | int ret; | |
448 | ||
449 | ret = iblock_do_unmap(cmd, bdev, lba, nolb); | |
450 | if (ret) | |
451 | return ret; | |
6f974e8c CH |
452 | |
453 | target_complete_cmd(cmd, GOOD); | |
454 | return 0; | |
455 | } | |
456 | ||
f6970ad3 NB |
457 | static sense_reason_t |
458 | iblock_execute_write_same(struct se_cmd *cmd) | |
459 | { | |
460 | struct iblock_req *ibr; | |
461 | struct scatterlist *sg; | |
462 | struct bio *bio; | |
463 | struct bio_list list; | |
464 | sector_t block_lba = cmd->t_task_lba; | |
972b29c8 | 465 | sector_t sectors = sbc_get_write_same_sectors(cmd); |
f6970ad3 NB |
466 | |
467 | sg = &cmd->t_data_sg[0]; | |
468 | ||
469 | if (cmd->t_data_nents > 1 || | |
470 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
471 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
472 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
473 | cmd->se_dev->dev_attrib.block_size); | |
474 | return TCM_INVALID_CDB_FIELD; | |
475 | } | |
476 | ||
477 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
478 | if (!ibr) | |
479 | goto fail; | |
480 | cmd->priv = ibr; | |
481 | ||
482 | bio = iblock_get_bio(cmd, block_lba, 1); | |
483 | if (!bio) | |
484 | goto fail_free_ibr; | |
485 | ||
486 | bio_list_init(&list); | |
487 | bio_list_add(&list, bio); | |
488 | ||
489 | atomic_set(&ibr->pending, 1); | |
490 | ||
491 | while (sectors) { | |
492 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
493 | != sg->length) { | |
494 | ||
495 | bio = iblock_get_bio(cmd, block_lba, 1); | |
496 | if (!bio) | |
497 | goto fail_put_bios; | |
498 | ||
499 | atomic_inc(&ibr->pending); | |
500 | bio_list_add(&list, bio); | |
501 | } | |
502 | ||
503 | /* Always in 512 byte units for Linux/Block */ | |
504 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
505 | sectors -= 1; | |
506 | } | |
507 | ||
508 | iblock_submit_bios(&list, WRITE); | |
509 | return 0; | |
510 | ||
511 | fail_put_bios: | |
512 | while ((bio = bio_list_pop(&list))) | |
513 | bio_put(bio); | |
514 | fail_free_ibr: | |
515 | kfree(ibr); | |
516 | fail: | |
517 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
518 | } | |
519 | ||
c66ac9db | 520 | enum { |
44bfd018 | 521 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
522 | }; |
523 | ||
524 | static match_table_t tokens = { | |
525 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 526 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
527 | {Opt_force, "force=%d"}, |
528 | {Opt_err, NULL} | |
529 | }; | |
530 | ||
0fd97ccf CH |
531 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
532 | const char *page, ssize_t count) | |
c66ac9db | 533 | { |
0fd97ccf | 534 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 535 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 536 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 537 | int ret = 0, token; |
44bfd018 | 538 | unsigned long tmp_readonly; |
c66ac9db NB |
539 | |
540 | opts = kstrdup(page, GFP_KERNEL); | |
541 | if (!opts) | |
542 | return -ENOMEM; | |
543 | ||
544 | orig = opts; | |
545 | ||
90c161b6 | 546 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
547 | if (!*ptr) |
548 | continue; | |
549 | ||
550 | token = match_token(ptr, tokens, args); | |
551 | switch (token) { | |
552 | case Opt_udev_path: | |
553 | if (ib_dev->ibd_bd) { | |
6708bb27 | 554 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
555 | " ib_dev->ibd_bd exists\n"); |
556 | ret = -EEXIST; | |
557 | goto out; | |
558 | } | |
852b6ed1 NB |
559 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
560 | SE_UDEV_PATH_LEN) == 0) { | |
561 | ret = -EINVAL; | |
6d180253 JJ |
562 | break; |
563 | } | |
6708bb27 | 564 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
565 | ib_dev->ibd_udev_path); |
566 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
567 | break; | |
44bfd018 AG |
568 | case Opt_readonly: |
569 | arg_p = match_strdup(&args[0]); | |
570 | if (!arg_p) { | |
571 | ret = -ENOMEM; | |
572 | break; | |
573 | } | |
57103d7f | 574 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
575 | kfree(arg_p); |
576 | if (ret < 0) { | |
57103d7f | 577 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
578 | " readonly=\n"); |
579 | goto out; | |
580 | } | |
581 | ib_dev->ibd_readonly = tmp_readonly; | |
582 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
583 | break; | |
c66ac9db | 584 | case Opt_force: |
c66ac9db NB |
585 | break; |
586 | default: | |
587 | break; | |
588 | } | |
589 | } | |
590 | ||
591 | out: | |
592 | kfree(orig); | |
593 | return (!ret) ? count : ret; | |
594 | } | |
595 | ||
0fd97ccf | 596 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 597 | { |
0fd97ccf CH |
598 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
599 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
600 | char buf[BDEVNAME_SIZE]; |
601 | ssize_t bl = 0; | |
602 | ||
603 | if (bd) | |
604 | bl += sprintf(b + bl, "iBlock device: %s", | |
605 | bdevname(bd, buf)); | |
0fd97ccf | 606 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 607 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
608 | ib_dev->ibd_udev_path); |
609 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
610 | |
611 | bl += sprintf(b + bl, " "); | |
612 | if (bd) { | |
613 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 614 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 615 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
616 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
617 | } else { | |
21bca31c | 618 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
619 | } |
620 | ||
621 | return bl; | |
622 | } | |
623 | ||
ecebbf6c NB |
624 | static int |
625 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) | |
626 | { | |
627 | struct se_device *dev = cmd->se_dev; | |
628 | struct blk_integrity *bi; | |
629 | struct bio_integrity_payload *bip; | |
630 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
631 | struct scatterlist *sg; | |
632 | int i, rc; | |
633 | ||
634 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
635 | if (!bi) { | |
636 | pr_err("Unable to locate bio_integrity\n"); | |
637 | return -ENODEV; | |
638 | } | |
639 | ||
640 | bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); | |
641 | if (!bip) { | |
642 | pr_err("Unable to allocate bio_integrity_payload\n"); | |
643 | return -ENOMEM; | |
644 | } | |
645 | ||
4e13c5d0 | 646 | bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
ecebbf6c | 647 | dev->prot_length; |
4e13c5d0 | 648 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
ecebbf6c | 649 | |
4e13c5d0 LT |
650 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
651 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c NB |
652 | |
653 | for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { | |
654 | ||
655 | rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, | |
656 | sg->offset); | |
657 | if (rc != sg->length) { | |
658 | pr_err("bio_integrity_add_page() failed; %d\n", rc); | |
659 | return -ENOMEM; | |
660 | } | |
661 | ||
662 | pr_debug("Added bio integrity page: %p length: %d offset; %d\n", | |
663 | sg_page(sg), sg->length, sg->offset); | |
664 | } | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
de103c93 | 669 | static sense_reason_t |
a82a9538 NB |
670 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
671 | enum dma_data_direction data_direction) | |
c66ac9db | 672 | { |
5951146d | 673 | struct se_device *dev = cmd->se_dev; |
5787cacd | 674 | struct iblock_req *ibr; |
ecebbf6c | 675 | struct bio *bio, *bio_start; |
dbbf3e94 | 676 | struct bio_list list; |
c66ac9db | 677 | struct scatterlist *sg; |
5787cacd | 678 | u32 sg_num = sgl_nents; |
c66ac9db | 679 | sector_t block_lba; |
d5b4a21b | 680 | unsigned bio_cnt; |
d0c8b259 | 681 | int rw = 0; |
5787cacd | 682 | int i; |
dbbf3e94 | 683 | |
5787cacd | 684 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
685 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
686 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 687 | /* |
d0c8b259 NB |
688 | * Force writethrough using WRITE_FUA if a volatile write cache |
689 | * is not enabled, or if initiator set the Force Unit Access bit. | |
dbbf3e94 | 690 | */ |
d0c8b259 NB |
691 | if (q->flush_flags & REQ_FUA) { |
692 | if (cmd->se_cmd_flags & SCF_FUA) | |
693 | rw = WRITE_FUA; | |
694 | else if (!(q->flush_flags & REQ_FLUSH)) | |
695 | rw = WRITE_FUA; | |
d2bdbee0 NB |
696 | else |
697 | rw = WRITE; | |
d0c8b259 | 698 | } else { |
dbbf3e94 | 699 | rw = WRITE; |
d0c8b259 | 700 | } |
dbbf3e94 CH |
701 | } else { |
702 | rw = READ; | |
703 | } | |
704 | ||
c66ac9db | 705 | /* |
5787cacd CH |
706 | * Convert the blocksize advertised to the initiator to the 512 byte |
707 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 708 | */ |
0fd97ccf | 709 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 710 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 711 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 712 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 713 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 714 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 715 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 716 | block_lba = cmd->t_task_lba; |
c66ac9db | 717 | else { |
6708bb27 | 718 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 719 | " %u\n", dev->dev_attrib.block_size); |
de103c93 | 720 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
721 | } |
722 | ||
5787cacd CH |
723 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
724 | if (!ibr) | |
725 | goto fail; | |
726 | cmd->priv = ibr; | |
727 | ||
e0de4457 PB |
728 | if (!sgl_nents) { |
729 | atomic_set(&ibr->pending, 1); | |
730 | iblock_complete_cmd(cmd); | |
731 | return 0; | |
732 | } | |
733 | ||
5787cacd CH |
734 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
735 | if (!bio) | |
736 | goto fail_free_ibr; | |
dbbf3e94 | 737 | |
ecebbf6c | 738 | bio_start = bio; |
dbbf3e94 CH |
739 | bio_list_init(&list); |
740 | bio_list_add(&list, bio); | |
5787cacd CH |
741 | |
742 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 743 | bio_cnt = 1; |
c66ac9db | 744 | |
5787cacd | 745 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
746 | /* |
747 | * XXX: if the length the device accepts is shorter than the | |
748 | * length of the S/G list entry this will cause and | |
749 | * endless loop. Better hope no driver uses huge pages. | |
750 | */ | |
751 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
752 | != sg->length) { | |
d5b4a21b CH |
753 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
754 | iblock_submit_bios(&list, rw); | |
755 | bio_cnt = 0; | |
756 | } | |
757 | ||
5787cacd | 758 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 759 | if (!bio) |
5787cacd CH |
760 | goto fail_put_bios; |
761 | ||
762 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 763 | bio_list_add(&list, bio); |
d5b4a21b | 764 | bio_cnt++; |
c66ac9db | 765 | } |
dbbf3e94 | 766 | |
c66ac9db NB |
767 | /* Always in 512 byte units for Linux/Block */ |
768 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
769 | sg_num--; | |
c66ac9db NB |
770 | } |
771 | ||
ecebbf6c NB |
772 | if (cmd->prot_type) { |
773 | int rc = iblock_alloc_bip(cmd, bio_start); | |
774 | if (rc) | |
775 | goto fail_put_bios; | |
776 | } | |
777 | ||
d5b4a21b | 778 | iblock_submit_bios(&list, rw); |
5787cacd | 779 | iblock_complete_cmd(cmd); |
03e98c9e | 780 | return 0; |
dbbf3e94 | 781 | |
5787cacd | 782 | fail_put_bios: |
dbbf3e94 | 783 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 784 | bio_put(bio); |
5787cacd CH |
785 | fail_free_ibr: |
786 | kfree(ibr); | |
5787cacd | 787 | fail: |
de103c93 | 788 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
789 | } |
790 | ||
c66ac9db NB |
791 | static sector_t iblock_get_blocks(struct se_device *dev) |
792 | { | |
0fd97ccf CH |
793 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
794 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
795 | struct request_queue *q = bdev_get_queue(bd); |
796 | ||
797 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
798 | } | |
799 | ||
7f7caf6a AG |
800 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
801 | { | |
802 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
803 | struct block_device *bd = ib_dev->ibd_bd; | |
804 | int ret; | |
805 | ||
806 | ret = bdev_alignment_offset(bd); | |
807 | if (ret == -1) | |
808 | return 0; | |
809 | ||
810 | /* convert offset-bytes to offset-lbas */ | |
811 | return ret / bdev_logical_block_size(bd); | |
812 | } | |
813 | ||
814 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
815 | { | |
816 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
817 | struct block_device *bd = ib_dev->ibd_bd; | |
818 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
819 | ||
820 | return ilog2(logs_per_phys); | |
821 | } | |
822 | ||
823 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
824 | { | |
825 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
826 | struct block_device *bd = ib_dev->ibd_bd; | |
827 | ||
828 | return bdev_io_min(bd); | |
829 | } | |
830 | ||
831 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
832 | { | |
833 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
834 | struct block_device *bd = ib_dev->ibd_bd; | |
835 | ||
836 | return bdev_io_opt(bd); | |
837 | } | |
838 | ||
9e999a6c | 839 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 840 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 841 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 842 | .execute_write_same = iblock_execute_write_same, |
f6970ad3 | 843 | .execute_write_same_unmap = iblock_execute_write_same_unmap, |
14150a6b | 844 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
845 | }; |
846 | ||
de103c93 CH |
847 | static sense_reason_t |
848 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 849 | { |
9e999a6c | 850 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
851 | } |
852 | ||
452e2010 | 853 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
854 | { |
855 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
856 | struct block_device *bd = ib_dev->ibd_bd; | |
857 | struct request_queue *q = bdev_get_queue(bd); | |
858 | ||
859 | return q->flush_flags & REQ_FLUSH; | |
860 | } | |
861 | ||
5645cba0 NB |
862 | DEF_TB_DEFAULT_ATTRIBS(iblock); |
863 | ||
864 | static struct configfs_attribute *iblock_backend_dev_attrs[] = { | |
865 | &iblock_dev_attrib_emulate_model_alias.attr, | |
866 | &iblock_dev_attrib_emulate_dpo.attr, | |
867 | &iblock_dev_attrib_emulate_fua_write.attr, | |
868 | &iblock_dev_attrib_emulate_fua_read.attr, | |
869 | &iblock_dev_attrib_emulate_write_cache.attr, | |
870 | &iblock_dev_attrib_emulate_ua_intlck_ctrl.attr, | |
871 | &iblock_dev_attrib_emulate_tas.attr, | |
872 | &iblock_dev_attrib_emulate_tpu.attr, | |
873 | &iblock_dev_attrib_emulate_tpws.attr, | |
874 | &iblock_dev_attrib_emulate_caw.attr, | |
875 | &iblock_dev_attrib_emulate_3pc.attr, | |
876 | &iblock_dev_attrib_pi_prot_type.attr, | |
877 | &iblock_dev_attrib_hw_pi_prot_type.attr, | |
878 | &iblock_dev_attrib_pi_prot_format.attr, | |
879 | &iblock_dev_attrib_enforce_pr_isids.attr, | |
880 | &iblock_dev_attrib_is_nonrot.attr, | |
881 | &iblock_dev_attrib_emulate_rest_reord.attr, | |
882 | &iblock_dev_attrib_force_pr_aptpl.attr, | |
883 | &iblock_dev_attrib_hw_block_size.attr, | |
884 | &iblock_dev_attrib_block_size.attr, | |
885 | &iblock_dev_attrib_hw_max_sectors.attr, | |
886 | &iblock_dev_attrib_fabric_max_sectors.attr, | |
887 | &iblock_dev_attrib_optimal_sectors.attr, | |
888 | &iblock_dev_attrib_hw_queue_depth.attr, | |
889 | &iblock_dev_attrib_queue_depth.attr, | |
890 | &iblock_dev_attrib_max_unmap_lba_count.attr, | |
891 | &iblock_dev_attrib_max_unmap_block_desc_count.attr, | |
892 | &iblock_dev_attrib_unmap_granularity.attr, | |
893 | &iblock_dev_attrib_unmap_granularity_alignment.attr, | |
894 | &iblock_dev_attrib_max_write_same_len.attr, | |
895 | NULL, | |
896 | }; | |
d30cd123 | 897 | |
c66ac9db NB |
898 | static struct se_subsystem_api iblock_template = { |
899 | .name = "iblock", | |
0fd97ccf CH |
900 | .inquiry_prod = "IBLOCK", |
901 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db NB |
902 | .owner = THIS_MODULE, |
903 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
c66ac9db NB |
904 | .attach_hba = iblock_attach_hba, |
905 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
906 | .alloc_device = iblock_alloc_device, |
907 | .configure_device = iblock_configure_device, | |
c66ac9db | 908 | .free_device = iblock_free_device, |
0c2ad7d1 | 909 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
910 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
911 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 912 | .get_device_type = sbc_get_device_type, |
c66ac9db | 913 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
914 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
915 | .get_lbppbe = iblock_get_lbppbe, | |
916 | .get_io_min = iblock_get_io_min, | |
917 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 918 | .get_write_cache = iblock_get_write_cache, |
c66ac9db NB |
919 | }; |
920 | ||
921 | static int __init iblock_module_init(void) | |
922 | { | |
5645cba0 NB |
923 | struct target_backend_cits *tbc = &iblock_template.tb_cits; |
924 | ||
925 | target_core_setup_sub_cits(&iblock_template); | |
926 | tbc->tb_dev_attrib_cit.ct_attrs = iblock_backend_dev_attrs; | |
927 | ||
c66ac9db NB |
928 | return transport_subsystem_register(&iblock_template); |
929 | } | |
930 | ||
63b91d5a | 931 | static void __exit iblock_module_exit(void) |
c66ac9db NB |
932 | { |
933 | transport_subsystem_release(&iblock_template); | |
934 | } | |
935 | ||
936 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
937 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
938 | MODULE_LICENSE("GPL"); | |
939 | ||
940 | module_init(iblock_module_init); | |
941 | module_exit(iblock_module_exit); |