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Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_iblock.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> Linux BlockIO transport | |
5 | * specific functions. | |
6 | * | |
4c76251e | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/string.h> |
28 | #include <linux/parser.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
c66ac9db NB |
34 | #include <linux/bio.h> |
35 | #include <linux/genhd.h> | |
36 | #include <linux/file.h> | |
827509e3 | 37 | #include <linux/module.h> |
c66ac9db NB |
38 | #include <scsi/scsi.h> |
39 | #include <scsi/scsi_host.h> | |
14150a6b | 40 | #include <asm/unaligned.h> |
c66ac9db NB |
41 | |
42 | #include <target/target_core_base.h> | |
c4795fb2 | 43 | #include <target/target_core_backend.h> |
c66ac9db NB |
44 | |
45 | #include "target_core_iblock.h" | |
46 | ||
d5b4a21b CH |
47 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
48 | #define IBLOCK_BIO_POOL_SIZE 128 | |
49 | ||
0fd97ccf CH |
50 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
51 | { | |
52 | return container_of(dev, struct iblock_dev, dev); | |
53 | } | |
54 | ||
55 | ||
c66ac9db NB |
56 | static struct se_subsystem_api iblock_template; |
57 | ||
c66ac9db NB |
58 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
59 | * | |
60 | * | |
61 | */ | |
62 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
63 | { | |
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
65 | " Generic Target Core Stack %s\n", hba->hba_id, |
66 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
67 | return 0; |
68 | } | |
69 | ||
70 | static void iblock_detach_hba(struct se_hba *hba) | |
71 | { | |
c66ac9db NB |
72 | } |
73 | ||
0fd97ccf | 74 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
75 | { |
76 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
77 | |
78 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
79 | if (!ib_dev) { |
80 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
81 | return NULL; |
82 | } | |
c66ac9db | 83 | |
6708bb27 | 84 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 85 | |
0fd97ccf | 86 | return &ib_dev->dev; |
c66ac9db NB |
87 | } |
88 | ||
0fd97ccf | 89 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 90 | { |
0fd97ccf | 91 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 92 | struct request_queue *q; |
0fd97ccf | 93 | struct block_device *bd = NULL; |
ecebbf6c | 94 | struct blk_integrity *bi; |
44bfd018 | 95 | fmode_t mode; |
0fd97ccf | 96 | int ret = -ENOMEM; |
c66ac9db | 97 | |
0fd97ccf CH |
98 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
99 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
100 | return -EINVAL; | |
c66ac9db | 101 | } |
d5b4a21b CH |
102 | |
103 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 104 | if (!ib_dev->ibd_bio_set) { |
0fd97ccf CH |
105 | pr_err("IBLOCK: Unable to create bioset\n"); |
106 | goto out; | |
c66ac9db | 107 | } |
0fd97ccf | 108 | |
6708bb27 | 109 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
110 | ib_dev->ibd_udev_path); |
111 | ||
44bfd018 AG |
112 | mode = FMODE_READ|FMODE_EXCL; |
113 | if (!ib_dev->ibd_readonly) | |
114 | mode |= FMODE_WRITE; | |
115 | ||
116 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
117 | if (IS_ERR(bd)) { |
118 | ret = PTR_ERR(bd); | |
0fd97ccf | 119 | goto out_free_bioset; |
613640e4 | 120 | } |
c66ac9db NB |
121 | ib_dev->ibd_bd = bd; |
122 | ||
0fd97ccf CH |
123 | q = bdev_get_queue(bd); |
124 | ||
125 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
126 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
127 | dev->dev_attrib.hw_queue_depth = q->nr_requests; | |
c66ac9db | 128 | |
c66ac9db NB |
129 | /* |
130 | * Check if the underlying struct block_device request_queue supports | |
131 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
132 | * in ATA and we need to set TPE=1 | |
133 | */ | |
613640e4 | 134 | if (blk_queue_discard(q)) { |
0fd97ccf | 135 | dev->dev_attrib.max_unmap_lba_count = |
c66ac9db | 136 | q->limits.max_discard_sectors; |
0fd97ccf | 137 | |
c66ac9db NB |
138 | /* |
139 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
140 | */ | |
0fd97ccf CH |
141 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
142 | dev->dev_attrib.unmap_granularity = | |
7347b5ff | 143 | q->limits.discard_granularity >> 9; |
0fd97ccf | 144 | dev->dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
145 | q->limits.discard_alignment; |
146 | ||
6708bb27 | 147 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
148 | " disabled by default\n"); |
149 | } | |
f6970ad3 NB |
150 | /* |
151 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
152 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
153 | */ | |
154 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 155 | |
e22a7f07 | 156 | if (blk_queue_nonrot(q)) |
0fd97ccf | 157 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 158 | |
ecebbf6c NB |
159 | bi = bdev_get_integrity(bd); |
160 | if (bi) { | |
161 | struct bio_set *bs = ib_dev->ibd_bio_set; | |
162 | ||
163 | if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") || | |
164 | !strcmp(bi->name, "T10-DIF-TYPE1-IP")) { | |
165 | pr_err("IBLOCK export of blk_integrity: %s not" | |
166 | " supported\n", bi->name); | |
167 | ret = -ENOSYS; | |
168 | goto out_blkdev_put; | |
169 | } | |
170 | ||
171 | if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) { | |
172 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; | |
173 | } else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) { | |
174 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; | |
175 | } | |
176 | ||
177 | if (dev->dev_attrib.pi_prot_type) { | |
178 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
179 | pr_err("Unable to allocate bioset for PI\n"); | |
180 | ret = -ENOMEM; | |
181 | goto out_blkdev_put; | |
182 | } | |
183 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
184 | bs->bio_integrity_pool); | |
185 | } | |
186 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
187 | } | |
188 | ||
0fd97ccf | 189 | return 0; |
c66ac9db | 190 | |
ecebbf6c NB |
191 | out_blkdev_put: |
192 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf CH |
193 | out_free_bioset: |
194 | bioset_free(ib_dev->ibd_bio_set); | |
195 | ib_dev->ibd_bio_set = NULL; | |
196 | out: | |
197 | return ret; | |
c66ac9db NB |
198 | } |
199 | ||
0fd97ccf | 200 | static void iblock_free_device(struct se_device *dev) |
c66ac9db | 201 | { |
0fd97ccf | 202 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 203 | |
bc665524 NB |
204 | if (ib_dev->ibd_bd != NULL) |
205 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
d84287bc | 206 | if (ib_dev->ibd_bio_set != NULL) |
bc665524 | 207 | bioset_free(ib_dev->ibd_bio_set); |
d84287bc | 208 | |
c66ac9db NB |
209 | kfree(ib_dev); |
210 | } | |
211 | ||
c66ac9db NB |
212 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
213 | struct se_device *dev, | |
214 | struct block_device *bd, | |
215 | struct request_queue *q) | |
216 | { | |
217 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
218 | bdev_logical_block_size(bd)) - 1); | |
219 | u32 block_size = bdev_logical_block_size(bd); | |
220 | ||
0fd97ccf | 221 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
222 | return blocks_long; |
223 | ||
224 | switch (block_size) { | |
225 | case 4096: | |
0fd97ccf | 226 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
227 | case 2048: |
228 | blocks_long <<= 1; | |
229 | break; | |
230 | case 1024: | |
231 | blocks_long <<= 2; | |
232 | break; | |
233 | case 512: | |
234 | blocks_long <<= 3; | |
235 | default: | |
236 | break; | |
237 | } | |
238 | break; | |
239 | case 2048: | |
0fd97ccf | 240 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
241 | case 4096: |
242 | blocks_long >>= 1; | |
243 | break; | |
244 | case 1024: | |
245 | blocks_long <<= 1; | |
246 | break; | |
247 | case 512: | |
248 | blocks_long <<= 2; | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | break; | |
254 | case 1024: | |
0fd97ccf | 255 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
256 | case 4096: |
257 | blocks_long >>= 2; | |
258 | break; | |
259 | case 2048: | |
260 | blocks_long >>= 1; | |
261 | break; | |
262 | case 512: | |
263 | blocks_long <<= 1; | |
264 | break; | |
265 | default: | |
266 | break; | |
267 | } | |
268 | break; | |
269 | case 512: | |
0fd97ccf | 270 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
271 | case 4096: |
272 | blocks_long >>= 3; | |
273 | break; | |
274 | case 2048: | |
275 | blocks_long >>= 2; | |
276 | break; | |
277 | case 1024: | |
278 | blocks_long >>= 1; | |
279 | break; | |
280 | default: | |
281 | break; | |
282 | } | |
283 | break; | |
284 | default: | |
285 | break; | |
286 | } | |
287 | ||
288 | return blocks_long; | |
289 | } | |
290 | ||
3a41d85f NB |
291 | static void iblock_complete_cmd(struct se_cmd *cmd) |
292 | { | |
293 | struct iblock_req *ibr = cmd->priv; | |
294 | u8 status; | |
295 | ||
296 | if (!atomic_dec_and_test(&ibr->pending)) | |
297 | return; | |
298 | ||
299 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
300 | status = SAM_STAT_CHECK_CONDITION; | |
301 | else | |
302 | status = SAM_STAT_GOOD; | |
303 | ||
304 | target_complete_cmd(cmd, status); | |
305 | kfree(ibr); | |
306 | } | |
307 | ||
308 | static void iblock_bio_done(struct bio *bio, int err) | |
309 | { | |
310 | struct se_cmd *cmd = bio->bi_private; | |
311 | struct iblock_req *ibr = cmd->priv; | |
312 | ||
313 | /* | |
314 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
315 | */ | |
316 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) | |
317 | err = -EIO; | |
318 | ||
319 | if (err != 0) { | |
320 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," | |
321 | " err: %d\n", bio, err); | |
322 | /* | |
323 | * Bump the ib_bio_err_cnt and release bio. | |
324 | */ | |
325 | atomic_inc(&ibr->ib_bio_err_cnt); | |
326 | smp_mb__after_atomic_inc(); | |
327 | } | |
328 | ||
329 | bio_put(bio); | |
330 | ||
331 | iblock_complete_cmd(cmd); | |
332 | } | |
333 | ||
334 | static struct bio * | |
335 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
336 | { | |
337 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
338 | struct bio *bio; | |
339 | ||
340 | /* | |
341 | * Only allocate as many vector entries as the bio code allows us to, | |
342 | * we'll loop later on until we have handled the whole request. | |
343 | */ | |
344 | if (sg_num > BIO_MAX_PAGES) | |
345 | sg_num = BIO_MAX_PAGES; | |
346 | ||
347 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
348 | if (!bio) { | |
349 | pr_err("Unable to allocate memory for bio\n"); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | bio->bi_bdev = ib_dev->ibd_bd; | |
354 | bio->bi_private = cmd; | |
355 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 356 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
357 | |
358 | return bio; | |
359 | } | |
360 | ||
361 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
362 | { | |
363 | struct blk_plug plug; | |
364 | struct bio *bio; | |
365 | ||
366 | blk_start_plug(&plug); | |
367 | while ((bio = bio_list_pop(list))) | |
368 | submit_bio(rw, bio); | |
369 | blk_finish_plug(&plug); | |
370 | } | |
371 | ||
df5fa691 CH |
372 | static void iblock_end_io_flush(struct bio *bio, int err) |
373 | { | |
374 | struct se_cmd *cmd = bio->bi_private; | |
375 | ||
376 | if (err) | |
377 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
378 | ||
5787cacd | 379 | if (cmd) { |
de103c93 | 380 | if (err) |
5787cacd | 381 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 382 | else |
5787cacd | 383 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
384 | } |
385 | ||
df5fa691 CH |
386 | bio_put(bio); |
387 | } | |
388 | ||
c66ac9db | 389 | /* |
df5fa691 CH |
390 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
391 | * always flush the whole cache. | |
c66ac9db | 392 | */ |
de103c93 CH |
393 | static sense_reason_t |
394 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 395 | { |
0fd97ccf | 396 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 397 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 398 | struct bio *bio; |
c66ac9db NB |
399 | |
400 | /* | |
401 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 402 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
403 | */ |
404 | if (immed) | |
5787cacd | 405 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 406 | |
df5fa691 CH |
407 | bio = bio_alloc(GFP_KERNEL, 0); |
408 | bio->bi_end_io = iblock_end_io_flush; | |
409 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 410 | if (!immed) |
df5fa691 CH |
411 | bio->bi_private = cmd; |
412 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 413 | return 0; |
c66ac9db NB |
414 | } |
415 | ||
dbc21c5a | 416 | static sense_reason_t |
86d71829 | 417 | iblock_do_unmap(struct se_cmd *cmd, void *priv, |
dbc21c5a AH |
418 | sector_t lba, sector_t nolb) |
419 | { | |
86d71829 | 420 | struct block_device *bdev = priv; |
dbc21c5a AH |
421 | int ret; |
422 | ||
423 | ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0); | |
424 | if (ret < 0) { | |
425 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
426 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
427 | } | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
de103c93 CH |
432 | static sense_reason_t |
433 | iblock_execute_unmap(struct se_cmd *cmd) | |
c66ac9db | 434 | { |
86d71829 | 435 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
c66ac9db | 436 | |
86d71829 | 437 | return sbc_execute_unmap(cmd, iblock_do_unmap, bdev); |
c66ac9db NB |
438 | } |
439 | ||
de103c93 | 440 | static sense_reason_t |
f6970ad3 | 441 | iblock_execute_write_same_unmap(struct se_cmd *cmd) |
6f974e8c | 442 | { |
dbc21c5a AH |
443 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
444 | sector_t lba = cmd->t_task_lba; | |
445 | sector_t nolb = sbc_get_write_same_sectors(cmd); | |
446 | int ret; | |
447 | ||
448 | ret = iblock_do_unmap(cmd, bdev, lba, nolb); | |
449 | if (ret) | |
450 | return ret; | |
6f974e8c CH |
451 | |
452 | target_complete_cmd(cmd, GOOD); | |
453 | return 0; | |
454 | } | |
455 | ||
f6970ad3 NB |
456 | static sense_reason_t |
457 | iblock_execute_write_same(struct se_cmd *cmd) | |
458 | { | |
459 | struct iblock_req *ibr; | |
460 | struct scatterlist *sg; | |
461 | struct bio *bio; | |
462 | struct bio_list list; | |
463 | sector_t block_lba = cmd->t_task_lba; | |
972b29c8 | 464 | sector_t sectors = sbc_get_write_same_sectors(cmd); |
f6970ad3 NB |
465 | |
466 | sg = &cmd->t_data_sg[0]; | |
467 | ||
468 | if (cmd->t_data_nents > 1 || | |
469 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
470 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
471 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
472 | cmd->se_dev->dev_attrib.block_size); | |
473 | return TCM_INVALID_CDB_FIELD; | |
474 | } | |
475 | ||
476 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
477 | if (!ibr) | |
478 | goto fail; | |
479 | cmd->priv = ibr; | |
480 | ||
481 | bio = iblock_get_bio(cmd, block_lba, 1); | |
482 | if (!bio) | |
483 | goto fail_free_ibr; | |
484 | ||
485 | bio_list_init(&list); | |
486 | bio_list_add(&list, bio); | |
487 | ||
488 | atomic_set(&ibr->pending, 1); | |
489 | ||
490 | while (sectors) { | |
491 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
492 | != sg->length) { | |
493 | ||
494 | bio = iblock_get_bio(cmd, block_lba, 1); | |
495 | if (!bio) | |
496 | goto fail_put_bios; | |
497 | ||
498 | atomic_inc(&ibr->pending); | |
499 | bio_list_add(&list, bio); | |
500 | } | |
501 | ||
502 | /* Always in 512 byte units for Linux/Block */ | |
503 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
504 | sectors -= 1; | |
505 | } | |
506 | ||
507 | iblock_submit_bios(&list, WRITE); | |
508 | return 0; | |
509 | ||
510 | fail_put_bios: | |
511 | while ((bio = bio_list_pop(&list))) | |
512 | bio_put(bio); | |
513 | fail_free_ibr: | |
514 | kfree(ibr); | |
515 | fail: | |
516 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
517 | } | |
518 | ||
c66ac9db | 519 | enum { |
44bfd018 | 520 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
521 | }; |
522 | ||
523 | static match_table_t tokens = { | |
524 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 525 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
526 | {Opt_force, "force=%d"}, |
527 | {Opt_err, NULL} | |
528 | }; | |
529 | ||
0fd97ccf CH |
530 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
531 | const char *page, ssize_t count) | |
c66ac9db | 532 | { |
0fd97ccf | 533 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 534 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 535 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 536 | int ret = 0, token; |
44bfd018 | 537 | unsigned long tmp_readonly; |
c66ac9db NB |
538 | |
539 | opts = kstrdup(page, GFP_KERNEL); | |
540 | if (!opts) | |
541 | return -ENOMEM; | |
542 | ||
543 | orig = opts; | |
544 | ||
90c161b6 | 545 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
546 | if (!*ptr) |
547 | continue; | |
548 | ||
549 | token = match_token(ptr, tokens, args); | |
550 | switch (token) { | |
551 | case Opt_udev_path: | |
552 | if (ib_dev->ibd_bd) { | |
6708bb27 | 553 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
554 | " ib_dev->ibd_bd exists\n"); |
555 | ret = -EEXIST; | |
556 | goto out; | |
557 | } | |
852b6ed1 NB |
558 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
559 | SE_UDEV_PATH_LEN) == 0) { | |
560 | ret = -EINVAL; | |
6d180253 JJ |
561 | break; |
562 | } | |
6708bb27 | 563 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
564 | ib_dev->ibd_udev_path); |
565 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
566 | break; | |
44bfd018 AG |
567 | case Opt_readonly: |
568 | arg_p = match_strdup(&args[0]); | |
569 | if (!arg_p) { | |
570 | ret = -ENOMEM; | |
571 | break; | |
572 | } | |
57103d7f | 573 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
574 | kfree(arg_p); |
575 | if (ret < 0) { | |
57103d7f | 576 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
577 | " readonly=\n"); |
578 | goto out; | |
579 | } | |
580 | ib_dev->ibd_readonly = tmp_readonly; | |
581 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
582 | break; | |
c66ac9db | 583 | case Opt_force: |
c66ac9db NB |
584 | break; |
585 | default: | |
586 | break; | |
587 | } | |
588 | } | |
589 | ||
590 | out: | |
591 | kfree(orig); | |
592 | return (!ret) ? count : ret; | |
593 | } | |
594 | ||
0fd97ccf | 595 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 596 | { |
0fd97ccf CH |
597 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
598 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
599 | char buf[BDEVNAME_SIZE]; |
600 | ssize_t bl = 0; | |
601 | ||
602 | if (bd) | |
603 | bl += sprintf(b + bl, "iBlock device: %s", | |
604 | bdevname(bd, buf)); | |
0fd97ccf | 605 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 606 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
607 | ib_dev->ibd_udev_path); |
608 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
609 | |
610 | bl += sprintf(b + bl, " "); | |
611 | if (bd) { | |
612 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 613 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 614 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
615 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
616 | } else { | |
21bca31c | 617 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
618 | } |
619 | ||
620 | return bl; | |
621 | } | |
622 | ||
ecebbf6c NB |
623 | static int |
624 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) | |
625 | { | |
626 | struct se_device *dev = cmd->se_dev; | |
627 | struct blk_integrity *bi; | |
628 | struct bio_integrity_payload *bip; | |
629 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
630 | struct scatterlist *sg; | |
631 | int i, rc; | |
632 | ||
633 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
634 | if (!bi) { | |
635 | pr_err("Unable to locate bio_integrity\n"); | |
636 | return -ENODEV; | |
637 | } | |
638 | ||
639 | bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); | |
640 | if (!bip) { | |
641 | pr_err("Unable to allocate bio_integrity_payload\n"); | |
642 | return -ENOMEM; | |
643 | } | |
644 | ||
4e13c5d0 | 645 | bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
ecebbf6c | 646 | dev->prot_length; |
4e13c5d0 | 647 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
ecebbf6c | 648 | |
4e13c5d0 LT |
649 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
650 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c NB |
651 | |
652 | for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { | |
653 | ||
654 | rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, | |
655 | sg->offset); | |
656 | if (rc != sg->length) { | |
657 | pr_err("bio_integrity_add_page() failed; %d\n", rc); | |
658 | return -ENOMEM; | |
659 | } | |
660 | ||
661 | pr_debug("Added bio integrity page: %p length: %d offset; %d\n", | |
662 | sg_page(sg), sg->length, sg->offset); | |
663 | } | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
de103c93 | 668 | static sense_reason_t |
a82a9538 NB |
669 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
670 | enum dma_data_direction data_direction) | |
c66ac9db | 671 | { |
5951146d | 672 | struct se_device *dev = cmd->se_dev; |
5787cacd | 673 | struct iblock_req *ibr; |
ecebbf6c | 674 | struct bio *bio, *bio_start; |
dbbf3e94 | 675 | struct bio_list list; |
c66ac9db | 676 | struct scatterlist *sg; |
5787cacd | 677 | u32 sg_num = sgl_nents; |
c66ac9db | 678 | sector_t block_lba; |
d5b4a21b | 679 | unsigned bio_cnt; |
d0c8b259 | 680 | int rw = 0; |
5787cacd | 681 | int i; |
dbbf3e94 | 682 | |
5787cacd | 683 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
684 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
685 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 686 | /* |
d0c8b259 NB |
687 | * Force writethrough using WRITE_FUA if a volatile write cache |
688 | * is not enabled, or if initiator set the Force Unit Access bit. | |
dbbf3e94 | 689 | */ |
d0c8b259 NB |
690 | if (q->flush_flags & REQ_FUA) { |
691 | if (cmd->se_cmd_flags & SCF_FUA) | |
692 | rw = WRITE_FUA; | |
693 | else if (!(q->flush_flags & REQ_FLUSH)) | |
694 | rw = WRITE_FUA; | |
d2bdbee0 NB |
695 | else |
696 | rw = WRITE; | |
d0c8b259 | 697 | } else { |
dbbf3e94 | 698 | rw = WRITE; |
d0c8b259 | 699 | } |
dbbf3e94 CH |
700 | } else { |
701 | rw = READ; | |
702 | } | |
703 | ||
c66ac9db | 704 | /* |
5787cacd CH |
705 | * Convert the blocksize advertised to the initiator to the 512 byte |
706 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 707 | */ |
0fd97ccf | 708 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 709 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 710 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 711 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 712 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 713 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 714 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 715 | block_lba = cmd->t_task_lba; |
c66ac9db | 716 | else { |
6708bb27 | 717 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 718 | " %u\n", dev->dev_attrib.block_size); |
de103c93 | 719 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
720 | } |
721 | ||
5787cacd CH |
722 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
723 | if (!ibr) | |
724 | goto fail; | |
725 | cmd->priv = ibr; | |
726 | ||
e0de4457 PB |
727 | if (!sgl_nents) { |
728 | atomic_set(&ibr->pending, 1); | |
729 | iblock_complete_cmd(cmd); | |
730 | return 0; | |
731 | } | |
732 | ||
5787cacd CH |
733 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
734 | if (!bio) | |
735 | goto fail_free_ibr; | |
dbbf3e94 | 736 | |
ecebbf6c | 737 | bio_start = bio; |
dbbf3e94 CH |
738 | bio_list_init(&list); |
739 | bio_list_add(&list, bio); | |
5787cacd CH |
740 | |
741 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 742 | bio_cnt = 1; |
c66ac9db | 743 | |
5787cacd | 744 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
745 | /* |
746 | * XXX: if the length the device accepts is shorter than the | |
747 | * length of the S/G list entry this will cause and | |
748 | * endless loop. Better hope no driver uses huge pages. | |
749 | */ | |
750 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
751 | != sg->length) { | |
d5b4a21b CH |
752 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
753 | iblock_submit_bios(&list, rw); | |
754 | bio_cnt = 0; | |
755 | } | |
756 | ||
5787cacd | 757 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 758 | if (!bio) |
5787cacd CH |
759 | goto fail_put_bios; |
760 | ||
761 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 762 | bio_list_add(&list, bio); |
d5b4a21b | 763 | bio_cnt++; |
c66ac9db | 764 | } |
dbbf3e94 | 765 | |
c66ac9db NB |
766 | /* Always in 512 byte units for Linux/Block */ |
767 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
768 | sg_num--; | |
c66ac9db NB |
769 | } |
770 | ||
ecebbf6c NB |
771 | if (cmd->prot_type) { |
772 | int rc = iblock_alloc_bip(cmd, bio_start); | |
773 | if (rc) | |
774 | goto fail_put_bios; | |
775 | } | |
776 | ||
d5b4a21b | 777 | iblock_submit_bios(&list, rw); |
5787cacd | 778 | iblock_complete_cmd(cmd); |
03e98c9e | 779 | return 0; |
dbbf3e94 | 780 | |
5787cacd | 781 | fail_put_bios: |
dbbf3e94 | 782 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 783 | bio_put(bio); |
5787cacd CH |
784 | fail_free_ibr: |
785 | kfree(ibr); | |
5787cacd | 786 | fail: |
de103c93 | 787 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
788 | } |
789 | ||
c66ac9db NB |
790 | static sector_t iblock_get_blocks(struct se_device *dev) |
791 | { | |
0fd97ccf CH |
792 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
793 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
794 | struct request_queue *q = bdev_get_queue(bd); |
795 | ||
796 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
797 | } | |
798 | ||
7f7caf6a AG |
799 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
800 | { | |
801 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
802 | struct block_device *bd = ib_dev->ibd_bd; | |
803 | int ret; | |
804 | ||
805 | ret = bdev_alignment_offset(bd); | |
806 | if (ret == -1) | |
807 | return 0; | |
808 | ||
809 | /* convert offset-bytes to offset-lbas */ | |
810 | return ret / bdev_logical_block_size(bd); | |
811 | } | |
812 | ||
813 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
814 | { | |
815 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
816 | struct block_device *bd = ib_dev->ibd_bd; | |
817 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
818 | ||
819 | return ilog2(logs_per_phys); | |
820 | } | |
821 | ||
822 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
823 | { | |
824 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
825 | struct block_device *bd = ib_dev->ibd_bd; | |
826 | ||
827 | return bdev_io_min(bd); | |
828 | } | |
829 | ||
830 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
831 | { | |
832 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
833 | struct block_device *bd = ib_dev->ibd_bd; | |
834 | ||
835 | return bdev_io_opt(bd); | |
836 | } | |
837 | ||
9e999a6c | 838 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 839 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 840 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 841 | .execute_write_same = iblock_execute_write_same, |
f6970ad3 | 842 | .execute_write_same_unmap = iblock_execute_write_same_unmap, |
14150a6b | 843 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
844 | }; |
845 | ||
de103c93 CH |
846 | static sense_reason_t |
847 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 848 | { |
9e999a6c | 849 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
850 | } |
851 | ||
452e2010 | 852 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
853 | { |
854 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
855 | struct block_device *bd = ib_dev->ibd_bd; | |
856 | struct request_queue *q = bdev_get_queue(bd); | |
857 | ||
858 | return q->flush_flags & REQ_FLUSH; | |
859 | } | |
860 | ||
c66ac9db NB |
861 | static struct se_subsystem_api iblock_template = { |
862 | .name = "iblock", | |
0fd97ccf CH |
863 | .inquiry_prod = "IBLOCK", |
864 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db NB |
865 | .owner = THIS_MODULE, |
866 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
c66ac9db NB |
867 | .attach_hba = iblock_attach_hba, |
868 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
869 | .alloc_device = iblock_alloc_device, |
870 | .configure_device = iblock_configure_device, | |
c66ac9db | 871 | .free_device = iblock_free_device, |
0c2ad7d1 | 872 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
873 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
874 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 875 | .get_device_type = sbc_get_device_type, |
c66ac9db | 876 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
877 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
878 | .get_lbppbe = iblock_get_lbppbe, | |
879 | .get_io_min = iblock_get_io_min, | |
880 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 881 | .get_write_cache = iblock_get_write_cache, |
c66ac9db NB |
882 | }; |
883 | ||
884 | static int __init iblock_module_init(void) | |
885 | { | |
886 | return transport_subsystem_register(&iblock_template); | |
887 | } | |
888 | ||
63b91d5a | 889 | static void __exit iblock_module_exit(void) |
c66ac9db NB |
890 | { |
891 | transport_subsystem_release(&iblock_template); | |
892 | } | |
893 | ||
894 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
895 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
896 | MODULE_LICENSE("GPL"); | |
897 | ||
898 | module_init(iblock_module_init); | |
899 | module_exit(iblock_module_exit); |