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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> |
ba929992 | 38 | #include <scsi/scsi_proto.h> |
14150a6b | 39 | #include <asm/unaligned.h> |
c66ac9db NB |
40 | |
41 | #include <target/target_core_base.h> | |
c4795fb2 | 42 | #include <target/target_core_backend.h> |
c66ac9db NB |
43 | |
44 | #include "target_core_iblock.h" | |
45 | ||
d5b4a21b CH |
46 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
47 | #define IBLOCK_BIO_POOL_SIZE 128 | |
48 | ||
0fd97ccf CH |
49 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
50 | { | |
51 | return container_of(dev, struct iblock_dev, dev); | |
52 | } | |
53 | ||
54 | ||
c66ac9db NB |
55 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
56 | { | |
6708bb27 | 57 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db | 58 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 59 | IBLOCK_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
60 | return 0; |
61 | } | |
62 | ||
63 | static void iblock_detach_hba(struct se_hba *hba) | |
64 | { | |
c66ac9db NB |
65 | } |
66 | ||
0fd97ccf | 67 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
68 | { |
69 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
70 | |
71 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
72 | if (!ib_dev) { |
73 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
74 | return NULL; |
75 | } | |
c66ac9db | 76 | |
6708bb27 | 77 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 78 | |
0fd97ccf | 79 | return &ib_dev->dev; |
c66ac9db NB |
80 | } |
81 | ||
0fd97ccf | 82 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 83 | { |
0fd97ccf | 84 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 85 | struct request_queue *q; |
0fd97ccf | 86 | struct block_device *bd = NULL; |
ecebbf6c | 87 | struct blk_integrity *bi; |
44bfd018 | 88 | fmode_t mode; |
0fd97ccf | 89 | int ret = -ENOMEM; |
c66ac9db | 90 | |
0fd97ccf CH |
91 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
92 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
93 | return -EINVAL; | |
c66ac9db | 94 | } |
d5b4a21b CH |
95 | |
96 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 97 | if (!ib_dev->ibd_bio_set) { |
0fd97ccf CH |
98 | pr_err("IBLOCK: Unable to create bioset\n"); |
99 | goto out; | |
c66ac9db | 100 | } |
0fd97ccf | 101 | |
6708bb27 | 102 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
103 | ib_dev->ibd_udev_path); |
104 | ||
44bfd018 AG |
105 | mode = FMODE_READ|FMODE_EXCL; |
106 | if (!ib_dev->ibd_readonly) | |
107 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
108 | else |
109 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
110 | |
111 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
112 | if (IS_ERR(bd)) { |
113 | ret = PTR_ERR(bd); | |
0fd97ccf | 114 | goto out_free_bioset; |
613640e4 | 115 | } |
c66ac9db NB |
116 | ib_dev->ibd_bd = bd; |
117 | ||
0fd97ccf CH |
118 | q = bdev_get_queue(bd); |
119 | ||
120 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
046ba642 | 121 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
0fd97ccf | 122 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 123 | |
ea263c7f | 124 | if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) |
6708bb27 | 125 | pr_debug("IBLOCK: BLOCK Discard support available," |
8a9ebe71 MC |
126 | " disabled by default\n"); |
127 | ||
f6970ad3 NB |
128 | /* |
129 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
130 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
131 | */ | |
132 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 133 | |
e22a7f07 | 134 | if (blk_queue_nonrot(q)) |
0fd97ccf | 135 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 136 | |
ecebbf6c NB |
137 | bi = bdev_get_integrity(bd); |
138 | if (bi) { | |
139 | struct bio_set *bs = ib_dev->ibd_bio_set; | |
140 | ||
0f8087ec MP |
141 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
142 | !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { | |
ecebbf6c | 143 | pr_err("IBLOCK export of blk_integrity: %s not" |
0f8087ec | 144 | " supported\n", bi->profile->name); |
ecebbf6c NB |
145 | ret = -ENOSYS; |
146 | goto out_blkdev_put; | |
147 | } | |
148 | ||
0f8087ec | 149 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
ecebbf6c | 150 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
0f8087ec | 151 | } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
ecebbf6c NB |
152 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
153 | } | |
154 | ||
155 | if (dev->dev_attrib.pi_prot_type) { | |
156 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
157 | pr_err("Unable to allocate bioset for PI\n"); | |
158 | ret = -ENOMEM; | |
159 | goto out_blkdev_put; | |
160 | } | |
161 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
162 | bs->bio_integrity_pool); | |
163 | } | |
164 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
165 | } | |
166 | ||
0fd97ccf | 167 | return 0; |
c66ac9db | 168 | |
ecebbf6c NB |
169 | out_blkdev_put: |
170 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf CH |
171 | out_free_bioset: |
172 | bioset_free(ib_dev->ibd_bio_set); | |
173 | ib_dev->ibd_bio_set = NULL; | |
174 | out: | |
175 | return ret; | |
c66ac9db NB |
176 | } |
177 | ||
4cc987ea NB |
178 | static void iblock_dev_call_rcu(struct rcu_head *p) |
179 | { | |
180 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
181 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
182 | ||
183 | kfree(ib_dev); | |
184 | } | |
185 | ||
0fd97ccf | 186 | static void iblock_free_device(struct se_device *dev) |
c66ac9db | 187 | { |
0fd97ccf | 188 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 189 | |
bc665524 NB |
190 | if (ib_dev->ibd_bd != NULL) |
191 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
d84287bc | 192 | if (ib_dev->ibd_bio_set != NULL) |
bc665524 | 193 | bioset_free(ib_dev->ibd_bio_set); |
d84287bc | 194 | |
4cc987ea | 195 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); |
c66ac9db NB |
196 | } |
197 | ||
c66ac9db NB |
198 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
199 | struct se_device *dev, | |
200 | struct block_device *bd, | |
201 | struct request_queue *q) | |
202 | { | |
203 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
204 | bdev_logical_block_size(bd)) - 1); | |
205 | u32 block_size = bdev_logical_block_size(bd); | |
206 | ||
0fd97ccf | 207 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
208 | return blocks_long; |
209 | ||
210 | switch (block_size) { | |
211 | case 4096: | |
0fd97ccf | 212 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
213 | case 2048: |
214 | blocks_long <<= 1; | |
215 | break; | |
216 | case 1024: | |
217 | blocks_long <<= 2; | |
218 | break; | |
219 | case 512: | |
220 | blocks_long <<= 3; | |
221 | default: | |
222 | break; | |
223 | } | |
224 | break; | |
225 | case 2048: | |
0fd97ccf | 226 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
227 | case 4096: |
228 | blocks_long >>= 1; | |
229 | break; | |
230 | case 1024: | |
231 | blocks_long <<= 1; | |
232 | break; | |
233 | case 512: | |
234 | blocks_long <<= 2; | |
235 | break; | |
236 | default: | |
237 | break; | |
238 | } | |
239 | break; | |
240 | case 1024: | |
0fd97ccf | 241 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
242 | case 4096: |
243 | blocks_long >>= 2; | |
244 | break; | |
245 | case 2048: | |
246 | blocks_long >>= 1; | |
247 | break; | |
248 | case 512: | |
249 | blocks_long <<= 1; | |
250 | break; | |
251 | default: | |
252 | break; | |
253 | } | |
254 | break; | |
255 | case 512: | |
0fd97ccf | 256 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
257 | case 4096: |
258 | blocks_long >>= 3; | |
259 | break; | |
260 | case 2048: | |
261 | blocks_long >>= 2; | |
262 | break; | |
263 | case 1024: | |
264 | blocks_long >>= 1; | |
265 | break; | |
266 | default: | |
267 | break; | |
268 | } | |
269 | break; | |
270 | default: | |
271 | break; | |
272 | } | |
273 | ||
274 | return blocks_long; | |
275 | } | |
276 | ||
3a41d85f NB |
277 | static void iblock_complete_cmd(struct se_cmd *cmd) |
278 | { | |
279 | struct iblock_req *ibr = cmd->priv; | |
280 | u8 status; | |
281 | ||
282 | if (!atomic_dec_and_test(&ibr->pending)) | |
283 | return; | |
284 | ||
285 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
286 | status = SAM_STAT_CHECK_CONDITION; | |
287 | else | |
288 | status = SAM_STAT_GOOD; | |
289 | ||
290 | target_complete_cmd(cmd, status); | |
291 | kfree(ibr); | |
292 | } | |
293 | ||
4246a0b6 | 294 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
295 | { |
296 | struct se_cmd *cmd = bio->bi_private; | |
297 | struct iblock_req *ibr = cmd->priv; | |
298 | ||
4246a0b6 CH |
299 | if (bio->bi_error) { |
300 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_error); | |
3a41d85f NB |
301 | /* |
302 | * Bump the ib_bio_err_cnt and release bio. | |
303 | */ | |
304 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 305 | smp_mb__after_atomic(); |
3a41d85f NB |
306 | } |
307 | ||
308 | bio_put(bio); | |
309 | ||
310 | iblock_complete_cmd(cmd); | |
311 | } | |
312 | ||
313 | static struct bio * | |
314 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
315 | { | |
316 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
317 | struct bio *bio; | |
318 | ||
319 | /* | |
320 | * Only allocate as many vector entries as the bio code allows us to, | |
321 | * we'll loop later on until we have handled the whole request. | |
322 | */ | |
323 | if (sg_num > BIO_MAX_PAGES) | |
324 | sg_num = BIO_MAX_PAGES; | |
325 | ||
326 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
327 | if (!bio) { | |
328 | pr_err("Unable to allocate memory for bio\n"); | |
329 | return NULL; | |
330 | } | |
331 | ||
332 | bio->bi_bdev = ib_dev->ibd_bd; | |
333 | bio->bi_private = cmd; | |
334 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 335 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
336 | |
337 | return bio; | |
338 | } | |
339 | ||
340 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
341 | { | |
342 | struct blk_plug plug; | |
343 | struct bio *bio; | |
344 | ||
345 | blk_start_plug(&plug); | |
346 | while ((bio = bio_list_pop(list))) | |
347 | submit_bio(rw, bio); | |
348 | blk_finish_plug(&plug); | |
349 | } | |
350 | ||
4246a0b6 | 351 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
352 | { |
353 | struct se_cmd *cmd = bio->bi_private; | |
354 | ||
4246a0b6 CH |
355 | if (bio->bi_error) |
356 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_error); | |
df5fa691 | 357 | |
5787cacd | 358 | if (cmd) { |
4246a0b6 | 359 | if (bio->bi_error) |
5787cacd | 360 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 361 | else |
5787cacd | 362 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
363 | } |
364 | ||
df5fa691 CH |
365 | bio_put(bio); |
366 | } | |
367 | ||
c66ac9db | 368 | /* |
df5fa691 CH |
369 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
370 | * always flush the whole cache. | |
c66ac9db | 371 | */ |
de103c93 CH |
372 | static sense_reason_t |
373 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 374 | { |
0fd97ccf | 375 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 376 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 377 | struct bio *bio; |
c66ac9db NB |
378 | |
379 | /* | |
380 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 381 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
382 | */ |
383 | if (immed) | |
5787cacd | 384 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 385 | |
df5fa691 CH |
386 | bio = bio_alloc(GFP_KERNEL, 0); |
387 | bio->bi_end_io = iblock_end_io_flush; | |
388 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 389 | if (!immed) |
df5fa691 CH |
390 | bio->bi_private = cmd; |
391 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 392 | return 0; |
c66ac9db NB |
393 | } |
394 | ||
dbc21c5a | 395 | static sense_reason_t |
62e46942 | 396 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 397 | { |
62e46942 | 398 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 399 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
400 | int ret; |
401 | ||
8a9ebe71 MC |
402 | ret = blkdev_issue_discard(bdev, |
403 | target_to_linux_sector(dev, lba), | |
404 | target_to_linux_sector(dev, nolb), | |
405 | GFP_KERNEL, 0); | |
dbc21c5a AH |
406 | if (ret < 0) { |
407 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
408 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
07b63196 MC |
414 | static sense_reason_t |
415 | iblock_execute_write_same_direct(struct block_device *bdev, struct se_cmd *cmd) | |
416 | { | |
417 | struct se_device *dev = cmd->se_dev; | |
418 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
419 | struct page *page = NULL; | |
420 | int ret; | |
421 | ||
422 | if (sg->offset) { | |
423 | page = alloc_page(GFP_KERNEL); | |
424 | if (!page) | |
425 | return TCM_OUT_OF_RESOURCES; | |
426 | sg_copy_to_buffer(sg, cmd->t_data_nents, page_address(page), | |
427 | dev->dev_attrib.block_size); | |
428 | } | |
429 | ||
430 | ret = blkdev_issue_write_same(bdev, | |
431 | target_to_linux_sector(dev, cmd->t_task_lba), | |
432 | target_to_linux_sector(dev, | |
433 | sbc_get_write_same_sectors(cmd)), | |
434 | GFP_KERNEL, page ? page : sg_page(sg)); | |
435 | if (page) | |
436 | __free_page(page); | |
437 | if (ret) | |
438 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
439 | ||
440 | target_complete_cmd(cmd, GOOD); | |
441 | return 0; | |
442 | } | |
443 | ||
f6970ad3 NB |
444 | static sense_reason_t |
445 | iblock_execute_write_same(struct se_cmd *cmd) | |
446 | { | |
07b63196 | 447 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
448 | struct iblock_req *ibr; |
449 | struct scatterlist *sg; | |
450 | struct bio *bio; | |
451 | struct bio_list list; | |
8a9ebe71 MC |
452 | struct se_device *dev = cmd->se_dev; |
453 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
454 | sector_t sectors = target_to_linux_sector(dev, | |
455 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 456 | |
afd73f1b NB |
457 | if (cmd->prot_op) { |
458 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
459 | " backends not supported\n"); | |
460 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
461 | } | |
f6970ad3 NB |
462 | sg = &cmd->t_data_sg[0]; |
463 | ||
464 | if (cmd->t_data_nents > 1 || | |
465 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
466 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
467 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
468 | cmd->se_dev->dev_attrib.block_size); | |
469 | return TCM_INVALID_CDB_FIELD; | |
470 | } | |
471 | ||
07b63196 MC |
472 | if (bdev_write_same(bdev)) |
473 | return iblock_execute_write_same_direct(bdev, cmd); | |
474 | ||
f6970ad3 NB |
475 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
476 | if (!ibr) | |
477 | goto fail; | |
478 | cmd->priv = ibr; | |
479 | ||
480 | bio = iblock_get_bio(cmd, block_lba, 1); | |
481 | if (!bio) | |
482 | goto fail_free_ibr; | |
483 | ||
484 | bio_list_init(&list); | |
485 | bio_list_add(&list, bio); | |
486 | ||
487 | atomic_set(&ibr->pending, 1); | |
488 | ||
489 | while (sectors) { | |
490 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
491 | != sg->length) { | |
492 | ||
493 | bio = iblock_get_bio(cmd, block_lba, 1); | |
494 | if (!bio) | |
495 | goto fail_put_bios; | |
496 | ||
497 | atomic_inc(&ibr->pending); | |
498 | bio_list_add(&list, bio); | |
499 | } | |
500 | ||
501 | /* Always in 512 byte units for Linux/Block */ | |
502 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
503 | sectors -= 1; | |
504 | } | |
505 | ||
506 | iblock_submit_bios(&list, WRITE); | |
507 | return 0; | |
508 | ||
509 | fail_put_bios: | |
510 | while ((bio = bio_list_pop(&list))) | |
511 | bio_put(bio); | |
512 | fail_free_ibr: | |
513 | kfree(ibr); | |
514 | fail: | |
515 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
516 | } | |
517 | ||
c66ac9db | 518 | enum { |
44bfd018 | 519 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
520 | }; |
521 | ||
522 | static match_table_t tokens = { | |
523 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 524 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
525 | {Opt_force, "force=%d"}, |
526 | {Opt_err, NULL} | |
527 | }; | |
528 | ||
0fd97ccf CH |
529 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
530 | const char *page, ssize_t count) | |
c66ac9db | 531 | { |
0fd97ccf | 532 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 533 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 534 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 535 | int ret = 0, token; |
44bfd018 | 536 | unsigned long tmp_readonly; |
c66ac9db NB |
537 | |
538 | opts = kstrdup(page, GFP_KERNEL); | |
539 | if (!opts) | |
540 | return -ENOMEM; | |
541 | ||
542 | orig = opts; | |
543 | ||
90c161b6 | 544 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
545 | if (!*ptr) |
546 | continue; | |
547 | ||
548 | token = match_token(ptr, tokens, args); | |
549 | switch (token) { | |
550 | case Opt_udev_path: | |
551 | if (ib_dev->ibd_bd) { | |
6708bb27 | 552 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
553 | " ib_dev->ibd_bd exists\n"); |
554 | ret = -EEXIST; | |
555 | goto out; | |
556 | } | |
852b6ed1 NB |
557 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
558 | SE_UDEV_PATH_LEN) == 0) { | |
559 | ret = -EINVAL; | |
6d180253 JJ |
560 | break; |
561 | } | |
6708bb27 | 562 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
563 | ib_dev->ibd_udev_path); |
564 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
565 | break; | |
44bfd018 AG |
566 | case Opt_readonly: |
567 | arg_p = match_strdup(&args[0]); | |
568 | if (!arg_p) { | |
569 | ret = -ENOMEM; | |
570 | break; | |
571 | } | |
57103d7f | 572 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
573 | kfree(arg_p); |
574 | if (ret < 0) { | |
57103d7f | 575 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
576 | " readonly=\n"); |
577 | goto out; | |
578 | } | |
579 | ib_dev->ibd_readonly = tmp_readonly; | |
580 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
581 | break; | |
c66ac9db | 582 | case Opt_force: |
c66ac9db NB |
583 | break; |
584 | default: | |
585 | break; | |
586 | } | |
587 | } | |
588 | ||
589 | out: | |
590 | kfree(orig); | |
591 | return (!ret) ? count : ret; | |
592 | } | |
593 | ||
0fd97ccf | 594 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 595 | { |
0fd97ccf CH |
596 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
597 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
598 | char buf[BDEVNAME_SIZE]; |
599 | ssize_t bl = 0; | |
600 | ||
601 | if (bd) | |
602 | bl += sprintf(b + bl, "iBlock device: %s", | |
603 | bdevname(bd, buf)); | |
0fd97ccf | 604 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 605 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
606 | ib_dev->ibd_udev_path); |
607 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
608 | |
609 | bl += sprintf(b + bl, " "); | |
610 | if (bd) { | |
611 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 612 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 613 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
614 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
615 | } else { | |
21bca31c | 616 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
617 | } |
618 | ||
619 | return bl; | |
620 | } | |
621 | ||
ecebbf6c NB |
622 | static int |
623 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) | |
624 | { | |
625 | struct se_device *dev = cmd->se_dev; | |
626 | struct blk_integrity *bi; | |
627 | struct bio_integrity_payload *bip; | |
628 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
629 | struct scatterlist *sg; | |
630 | int i, rc; | |
631 | ||
632 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
633 | if (!bi) { | |
634 | pr_err("Unable to locate bio_integrity\n"); | |
635 | return -ENODEV; | |
636 | } | |
637 | ||
638 | bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); | |
06c1e390 | 639 | if (IS_ERR(bip)) { |
ecebbf6c | 640 | pr_err("Unable to allocate bio_integrity_payload\n"); |
06c1e390 | 641 | return PTR_ERR(bip); |
ecebbf6c NB |
642 | } |
643 | ||
4e13c5d0 | 644 | bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
ecebbf6c | 645 | dev->prot_length; |
4e13c5d0 | 646 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
ecebbf6c | 647 | |
4e13c5d0 LT |
648 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
649 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c NB |
650 | |
651 | for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { | |
652 | ||
653 | rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, | |
654 | sg->offset); | |
655 | if (rc != sg->length) { | |
656 | pr_err("bio_integrity_add_page() failed; %d\n", rc); | |
657 | return -ENOMEM; | |
658 | } | |
659 | ||
660 | pr_debug("Added bio integrity page: %p length: %d offset; %d\n", | |
661 | sg_page(sg), sg->length, sg->offset); | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
de103c93 | 667 | static sense_reason_t |
a82a9538 NB |
668 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
669 | enum dma_data_direction data_direction) | |
c66ac9db | 670 | { |
5951146d | 671 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 672 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
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; |
d5b4a21b | 678 | unsigned bio_cnt; |
d0c8b259 | 679 | int rw = 0; |
5787cacd | 680 | int i; |
dbbf3e94 | 681 | |
5787cacd | 682 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
683 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
684 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 685 | /* |
d0c8b259 NB |
686 | * Force writethrough using WRITE_FUA if a volatile write cache |
687 | * is not enabled, or if initiator set the Force Unit Access bit. | |
dbbf3e94 | 688 | */ |
c888a8f9 | 689 | if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
d0c8b259 NB |
690 | if (cmd->se_cmd_flags & SCF_FUA) |
691 | rw = WRITE_FUA; | |
c888a8f9 | 692 | else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
d0c8b259 | 693 | rw = WRITE_FUA; |
d2bdbee0 NB |
694 | else |
695 | rw = WRITE; | |
d0c8b259 | 696 | } else { |
dbbf3e94 | 697 | rw = WRITE; |
d0c8b259 | 698 | } |
dbbf3e94 CH |
699 | } else { |
700 | rw = READ; | |
701 | } | |
702 | ||
5787cacd CH |
703 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
704 | if (!ibr) | |
705 | goto fail; | |
706 | cmd->priv = ibr; | |
707 | ||
e0de4457 PB |
708 | if (!sgl_nents) { |
709 | atomic_set(&ibr->pending, 1); | |
710 | iblock_complete_cmd(cmd); | |
711 | return 0; | |
712 | } | |
713 | ||
5787cacd CH |
714 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
715 | if (!bio) | |
716 | goto fail_free_ibr; | |
dbbf3e94 | 717 | |
ecebbf6c | 718 | bio_start = bio; |
dbbf3e94 CH |
719 | bio_list_init(&list); |
720 | bio_list_add(&list, bio); | |
5787cacd CH |
721 | |
722 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 723 | bio_cnt = 1; |
c66ac9db | 724 | |
5787cacd | 725 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
726 | /* |
727 | * XXX: if the length the device accepts is shorter than the | |
728 | * length of the S/G list entry this will cause and | |
729 | * endless loop. Better hope no driver uses huge pages. | |
730 | */ | |
731 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
732 | != sg->length) { | |
d5b4a21b CH |
733 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
734 | iblock_submit_bios(&list, rw); | |
735 | bio_cnt = 0; | |
736 | } | |
737 | ||
5787cacd | 738 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 739 | if (!bio) |
5787cacd CH |
740 | goto fail_put_bios; |
741 | ||
742 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 743 | bio_list_add(&list, bio); |
d5b4a21b | 744 | bio_cnt++; |
c66ac9db | 745 | } |
dbbf3e94 | 746 | |
c66ac9db NB |
747 | /* Always in 512 byte units for Linux/Block */ |
748 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
749 | sg_num--; | |
c66ac9db NB |
750 | } |
751 | ||
6f16ec43 | 752 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
ecebbf6c NB |
753 | int rc = iblock_alloc_bip(cmd, bio_start); |
754 | if (rc) | |
755 | goto fail_put_bios; | |
756 | } | |
757 | ||
d5b4a21b | 758 | iblock_submit_bios(&list, rw); |
5787cacd | 759 | iblock_complete_cmd(cmd); |
03e98c9e | 760 | return 0; |
dbbf3e94 | 761 | |
5787cacd | 762 | fail_put_bios: |
dbbf3e94 | 763 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 764 | bio_put(bio); |
5787cacd CH |
765 | fail_free_ibr: |
766 | kfree(ibr); | |
5787cacd | 767 | fail: |
de103c93 | 768 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
769 | } |
770 | ||
c66ac9db NB |
771 | static sector_t iblock_get_blocks(struct se_device *dev) |
772 | { | |
0fd97ccf CH |
773 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
774 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
775 | struct request_queue *q = bdev_get_queue(bd); |
776 | ||
777 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
778 | } | |
779 | ||
7f7caf6a AG |
780 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
781 | { | |
782 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
783 | struct block_device *bd = ib_dev->ibd_bd; | |
784 | int ret; | |
785 | ||
786 | ret = bdev_alignment_offset(bd); | |
787 | if (ret == -1) | |
788 | return 0; | |
789 | ||
790 | /* convert offset-bytes to offset-lbas */ | |
791 | return ret / bdev_logical_block_size(bd); | |
792 | } | |
793 | ||
794 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
795 | { | |
796 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
797 | struct block_device *bd = ib_dev->ibd_bd; | |
798 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
799 | ||
800 | return ilog2(logs_per_phys); | |
801 | } | |
802 | ||
803 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
804 | { | |
805 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
806 | struct block_device *bd = ib_dev->ibd_bd; | |
807 | ||
808 | return bdev_io_min(bd); | |
809 | } | |
810 | ||
811 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
812 | { | |
813 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
814 | struct block_device *bd = ib_dev->ibd_bd; | |
815 | ||
816 | return bdev_io_opt(bd); | |
817 | } | |
818 | ||
9e999a6c | 819 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 820 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 821 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 822 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 823 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
824 | }; |
825 | ||
de103c93 CH |
826 | static sense_reason_t |
827 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 828 | { |
9e999a6c | 829 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
830 | } |
831 | ||
452e2010 | 832 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
833 | { |
834 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
835 | struct block_device *bd = ib_dev->ibd_bd; | |
836 | struct request_queue *q = bdev_get_queue(bd); | |
837 | ||
c888a8f9 | 838 | return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
d0c8b259 NB |
839 | } |
840 | ||
0a06d430 | 841 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 842 | .name = "iblock", |
0fd97ccf CH |
843 | .inquiry_prod = "IBLOCK", |
844 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 845 | .owner = THIS_MODULE, |
c66ac9db NB |
846 | .attach_hba = iblock_attach_hba, |
847 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
848 | .alloc_device = iblock_alloc_device, |
849 | .configure_device = iblock_configure_device, | |
c66ac9db | 850 | .free_device = iblock_free_device, |
0c2ad7d1 | 851 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
852 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
853 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 854 | .get_device_type = sbc_get_device_type, |
c66ac9db | 855 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
856 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
857 | .get_lbppbe = iblock_get_lbppbe, | |
858 | .get_io_min = iblock_get_io_min, | |
859 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 860 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 861 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
862 | }; |
863 | ||
864 | static int __init iblock_module_init(void) | |
865 | { | |
0a06d430 | 866 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
867 | } |
868 | ||
63b91d5a | 869 | static void __exit iblock_module_exit(void) |
c66ac9db | 870 | { |
0a06d430 | 871 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
872 | } |
873 | ||
874 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
875 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
876 | MODULE_LICENSE("GPL"); | |
877 | ||
878 | module_init(iblock_module_init); | |
879 | module_exit(iblock_module_exit); |