Commit | Line | Data |
---|---|---|
c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_iblock.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> Linux BlockIO transport | |
5 | * specific functions. | |
6 | * | |
4c76251e | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/string.h> |
28 | #include <linux/parser.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
c66ac9db NB |
34 | #include <linux/bio.h> |
35 | #include <linux/genhd.h> | |
36 | #include <linux/file.h> | |
827509e3 | 37 | #include <linux/module.h> |
ba929992 | 38 | #include <scsi/scsi_proto.h> |
14150a6b | 39 | #include <asm/unaligned.h> |
c66ac9db NB |
40 | |
41 | #include <target/target_core_base.h> | |
c4795fb2 | 42 | #include <target/target_core_backend.h> |
c66ac9db NB |
43 | |
44 | #include "target_core_iblock.h" | |
45 | ||
d5b4a21b CH |
46 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
47 | #define IBLOCK_BIO_POOL_SIZE 128 | |
48 | ||
0fd97ccf CH |
49 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
50 | { | |
51 | return container_of(dev, struct iblock_dev, dev); | |
52 | } | |
53 | ||
54 | ||
c66ac9db NB |
55 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
56 | { | |
6708bb27 | 57 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db | 58 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 59 | IBLOCK_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
60 | return 0; |
61 | } | |
62 | ||
63 | static void iblock_detach_hba(struct se_hba *hba) | |
64 | { | |
c66ac9db NB |
65 | } |
66 | ||
0fd97ccf | 67 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
68 | { |
69 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
70 | |
71 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
72 | if (!ib_dev) { |
73 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
74 | return NULL; |
75 | } | |
c66ac9db | 76 | |
6708bb27 | 77 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 78 | |
0fd97ccf | 79 | return &ib_dev->dev; |
c66ac9db NB |
80 | } |
81 | ||
0fd97ccf | 82 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 83 | { |
0fd97ccf | 84 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 85 | struct request_queue *q; |
0fd97ccf | 86 | struct block_device *bd = NULL; |
ecebbf6c | 87 | struct blk_integrity *bi; |
44bfd018 | 88 | fmode_t mode; |
2237498f | 89 | unsigned int max_write_zeroes_sectors; |
0fd97ccf | 90 | int ret = -ENOMEM; |
c66ac9db | 91 | |
0fd97ccf CH |
92 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
93 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
94 | return -EINVAL; | |
c66ac9db | 95 | } |
d5b4a21b | 96 | |
a47a28b7 KO |
97 | ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
98 | if (ret) { | |
0fd97ccf CH |
99 | pr_err("IBLOCK: Unable to create bioset\n"); |
100 | goto out; | |
c66ac9db | 101 | } |
0fd97ccf | 102 | |
6708bb27 | 103 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
104 | ib_dev->ibd_udev_path); |
105 | ||
44bfd018 AG |
106 | mode = FMODE_READ|FMODE_EXCL; |
107 | if (!ib_dev->ibd_readonly) | |
108 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
109 | else |
110 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
111 | |
112 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
113 | if (IS_ERR(bd)) { |
114 | ret = PTR_ERR(bd); | |
0fd97ccf | 115 | goto out_free_bioset; |
613640e4 | 116 | } |
c66ac9db NB |
117 | ib_dev->ibd_bd = bd; |
118 | ||
0fd97ccf CH |
119 | q = bdev_get_queue(bd); |
120 | ||
121 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
046ba642 | 122 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
0fd97ccf | 123 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 124 | |
ea263c7f | 125 | if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) |
6708bb27 | 126 | pr_debug("IBLOCK: BLOCK Discard support available," |
8a9ebe71 MC |
127 | " disabled by default\n"); |
128 | ||
f6970ad3 NB |
129 | /* |
130 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
131 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
132 | */ | |
2237498f NB |
133 | max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); |
134 | if (max_write_zeroes_sectors) | |
135 | dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; | |
136 | else | |
137 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 138 | |
e22a7f07 | 139 | if (blk_queue_nonrot(q)) |
0fd97ccf | 140 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 141 | |
ecebbf6c NB |
142 | bi = bdev_get_integrity(bd); |
143 | if (bi) { | |
a47a28b7 | 144 | struct bio_set *bs = &ib_dev->ibd_bio_set; |
ecebbf6c | 145 | |
0f8087ec MP |
146 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
147 | !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { | |
ecebbf6c | 148 | pr_err("IBLOCK export of blk_integrity: %s not" |
0f8087ec | 149 | " supported\n", bi->profile->name); |
ecebbf6c NB |
150 | ret = -ENOSYS; |
151 | goto out_blkdev_put; | |
152 | } | |
153 | ||
0f8087ec | 154 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
ecebbf6c | 155 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
0f8087ec | 156 | } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
ecebbf6c NB |
157 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
158 | } | |
159 | ||
160 | if (dev->dev_attrib.pi_prot_type) { | |
161 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
162 | pr_err("Unable to allocate bioset for PI\n"); | |
163 | ret = -ENOMEM; | |
164 | goto out_blkdev_put; | |
165 | } | |
166 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
f4f8154a | 167 | &bs->bio_integrity_pool); |
ecebbf6c NB |
168 | } |
169 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
170 | } | |
171 | ||
0fd97ccf | 172 | return 0; |
c66ac9db | 173 | |
ecebbf6c NB |
174 | out_blkdev_put: |
175 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf | 176 | out_free_bioset: |
a47a28b7 | 177 | bioset_exit(&ib_dev->ibd_bio_set); |
0fd97ccf CH |
178 | out: |
179 | return ret; | |
c66ac9db NB |
180 | } |
181 | ||
4cc987ea NB |
182 | static void iblock_dev_call_rcu(struct rcu_head *p) |
183 | { | |
184 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
185 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
186 | ||
187 | kfree(ib_dev); | |
188 | } | |
189 | ||
0fd97ccf | 190 | static void iblock_free_device(struct se_device *dev) |
92634706 MC |
191 | { |
192 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); | |
193 | } | |
194 | ||
195 | static void iblock_destroy_device(struct se_device *dev) | |
c66ac9db | 196 | { |
0fd97ccf | 197 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 198 | |
bc665524 NB |
199 | if (ib_dev->ibd_bd != NULL) |
200 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
a47a28b7 | 201 | bioset_exit(&ib_dev->ibd_bio_set); |
c66ac9db NB |
202 | } |
203 | ||
c66ac9db NB |
204 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
205 | struct se_device *dev, | |
206 | struct block_device *bd, | |
207 | struct request_queue *q) | |
208 | { | |
209 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
210 | bdev_logical_block_size(bd)) - 1); | |
211 | u32 block_size = bdev_logical_block_size(bd); | |
212 | ||
0fd97ccf | 213 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
214 | return blocks_long; |
215 | ||
216 | switch (block_size) { | |
217 | case 4096: | |
0fd97ccf | 218 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
219 | case 2048: |
220 | blocks_long <<= 1; | |
221 | break; | |
222 | case 1024: | |
223 | blocks_long <<= 2; | |
224 | break; | |
225 | case 512: | |
226 | blocks_long <<= 3; | |
227 | default: | |
228 | break; | |
229 | } | |
230 | break; | |
231 | case 2048: | |
0fd97ccf | 232 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
233 | case 4096: |
234 | blocks_long >>= 1; | |
235 | break; | |
236 | case 1024: | |
237 | blocks_long <<= 1; | |
238 | break; | |
239 | case 512: | |
240 | blocks_long <<= 2; | |
241 | break; | |
242 | default: | |
243 | break; | |
244 | } | |
245 | break; | |
246 | case 1024: | |
0fd97ccf | 247 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
248 | case 4096: |
249 | blocks_long >>= 2; | |
250 | break; | |
251 | case 2048: | |
252 | blocks_long >>= 1; | |
253 | break; | |
254 | case 512: | |
255 | blocks_long <<= 1; | |
256 | break; | |
257 | default: | |
258 | break; | |
259 | } | |
260 | break; | |
261 | case 512: | |
0fd97ccf | 262 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
263 | case 4096: |
264 | blocks_long >>= 3; | |
265 | break; | |
266 | case 2048: | |
267 | blocks_long >>= 2; | |
268 | break; | |
269 | case 1024: | |
270 | blocks_long >>= 1; | |
271 | break; | |
272 | default: | |
273 | break; | |
274 | } | |
275 | break; | |
276 | default: | |
277 | break; | |
278 | } | |
279 | ||
280 | return blocks_long; | |
281 | } | |
282 | ||
3a41d85f NB |
283 | static void iblock_complete_cmd(struct se_cmd *cmd) |
284 | { | |
285 | struct iblock_req *ibr = cmd->priv; | |
286 | u8 status; | |
287 | ||
5981c245 | 288 | if (!refcount_dec_and_test(&ibr->pending)) |
3a41d85f NB |
289 | return; |
290 | ||
291 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
292 | status = SAM_STAT_CHECK_CONDITION; | |
293 | else | |
294 | status = SAM_STAT_GOOD; | |
295 | ||
296 | target_complete_cmd(cmd, status); | |
297 | kfree(ibr); | |
298 | } | |
299 | ||
4246a0b6 | 300 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
301 | { |
302 | struct se_cmd *cmd = bio->bi_private; | |
303 | struct iblock_req *ibr = cmd->priv; | |
304 | ||
4e4cbee9 CH |
305 | if (bio->bi_status) { |
306 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); | |
3a41d85f NB |
307 | /* |
308 | * Bump the ib_bio_err_cnt and release bio. | |
309 | */ | |
310 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 311 | smp_mb__after_atomic(); |
3a41d85f NB |
312 | } |
313 | ||
314 | bio_put(bio); | |
315 | ||
316 | iblock_complete_cmd(cmd); | |
317 | } | |
318 | ||
319 | static struct bio * | |
e742fc32 MC |
320 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, int op, |
321 | int op_flags) | |
3a41d85f NB |
322 | { |
323 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
324 | struct bio *bio; | |
325 | ||
326 | /* | |
327 | * Only allocate as many vector entries as the bio code allows us to, | |
328 | * we'll loop later on until we have handled the whole request. | |
329 | */ | |
330 | if (sg_num > BIO_MAX_PAGES) | |
331 | sg_num = BIO_MAX_PAGES; | |
332 | ||
a47a28b7 | 333 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, &ib_dev->ibd_bio_set); |
3a41d85f NB |
334 | if (!bio) { |
335 | pr_err("Unable to allocate memory for bio\n"); | |
336 | return NULL; | |
337 | } | |
338 | ||
74d46992 | 339 | bio_set_dev(bio, ib_dev->ibd_bd); |
3a41d85f NB |
340 | bio->bi_private = cmd; |
341 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 342 | bio->bi_iter.bi_sector = lba; |
e742fc32 | 343 | bio_set_op_attrs(bio, op, op_flags); |
3a41d85f NB |
344 | |
345 | return bio; | |
346 | } | |
347 | ||
4e49ea4a | 348 | static void iblock_submit_bios(struct bio_list *list) |
3a41d85f NB |
349 | { |
350 | struct blk_plug plug; | |
351 | struct bio *bio; | |
352 | ||
353 | blk_start_plug(&plug); | |
354 | while ((bio = bio_list_pop(list))) | |
4e49ea4a | 355 | submit_bio(bio); |
3a41d85f NB |
356 | blk_finish_plug(&plug); |
357 | } | |
358 | ||
4246a0b6 | 359 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
360 | { |
361 | struct se_cmd *cmd = bio->bi_private; | |
362 | ||
4e4cbee9 CH |
363 | if (bio->bi_status) |
364 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); | |
df5fa691 | 365 | |
5787cacd | 366 | if (cmd) { |
4e4cbee9 | 367 | if (bio->bi_status) |
5787cacd | 368 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 369 | else |
5787cacd | 370 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
371 | } |
372 | ||
df5fa691 CH |
373 | bio_put(bio); |
374 | } | |
375 | ||
c66ac9db | 376 | /* |
df5fa691 CH |
377 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
378 | * always flush the whole cache. | |
c66ac9db | 379 | */ |
de103c93 CH |
380 | static sense_reason_t |
381 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 382 | { |
0fd97ccf | 383 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 384 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 385 | struct bio *bio; |
c66ac9db NB |
386 | |
387 | /* | |
388 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 389 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
390 | */ |
391 | if (immed) | |
5787cacd | 392 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 393 | |
df5fa691 CH |
394 | bio = bio_alloc(GFP_KERNEL, 0); |
395 | bio->bi_end_io = iblock_end_io_flush; | |
74d46992 | 396 | bio_set_dev(bio, ib_dev->ibd_bd); |
70fd7614 | 397 | bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
c66ac9db | 398 | if (!immed) |
df5fa691 | 399 | bio->bi_private = cmd; |
4e49ea4a | 400 | submit_bio(bio); |
ad67f0d9 | 401 | return 0; |
c66ac9db NB |
402 | } |
403 | ||
dbc21c5a | 404 | static sense_reason_t |
62e46942 | 405 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 406 | { |
62e46942 | 407 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 408 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
409 | int ret; |
410 | ||
8a9ebe71 MC |
411 | ret = blkdev_issue_discard(bdev, |
412 | target_to_linux_sector(dev, lba), | |
413 | target_to_linux_sector(dev, nolb), | |
414 | GFP_KERNEL, 0); | |
dbc21c5a AH |
415 | if (ret < 0) { |
416 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
417 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
418 | } | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
07b63196 | 423 | static sense_reason_t |
2237498f | 424 | iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) |
07b63196 MC |
425 | { |
426 | struct se_device *dev = cmd->se_dev; | |
427 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
f5957dad BL |
428 | unsigned char *buf, *not_zero; |
429 | int ret; | |
07b63196 | 430 | |
2237498f NB |
431 | buf = kmap(sg_page(sg)) + sg->offset; |
432 | if (!buf) | |
433 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
434 | /* | |
435 | * Fall back to block_execute_write_same() slow-path if | |
436 | * incoming WRITE_SAME payload does not contain zeros. | |
437 | */ | |
f5957dad | 438 | not_zero = memchr_inv(buf, 0x00, cmd->data_length); |
2237498f | 439 | kunmap(sg_page(sg)); |
07b63196 | 440 | |
f5957dad | 441 | if (not_zero) |
2237498f | 442 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
07b63196 | 443 | |
2237498f | 444 | ret = blkdev_issue_zeroout(bdev, |
07b63196 MC |
445 | target_to_linux_sector(dev, cmd->t_task_lba), |
446 | target_to_linux_sector(dev, | |
447 | sbc_get_write_same_sectors(cmd)), | |
2237498f | 448 | GFP_KERNEL, false); |
07b63196 MC |
449 | if (ret) |
450 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
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 | { | |
07b63196 | 459 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
460 | struct iblock_req *ibr; |
461 | struct scatterlist *sg; | |
462 | struct bio *bio; | |
463 | struct bio_list list; | |
8a9ebe71 MC |
464 | struct se_device *dev = cmd->se_dev; |
465 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
466 | sector_t sectors = target_to_linux_sector(dev, | |
467 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 468 | |
afd73f1b NB |
469 | if (cmd->prot_op) { |
470 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
471 | " backends not supported\n"); | |
472 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
473 | } | |
f6970ad3 NB |
474 | sg = &cmd->t_data_sg[0]; |
475 | ||
476 | if (cmd->t_data_nents > 1 || | |
477 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
478 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
479 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
480 | cmd->se_dev->dev_attrib.block_size); | |
481 | return TCM_INVALID_CDB_FIELD; | |
482 | } | |
483 | ||
2237498f NB |
484 | if (bdev_write_zeroes_sectors(bdev)) { |
485 | if (!iblock_execute_zero_out(bdev, cmd)) | |
486 | return 0; | |
487 | } | |
07b63196 | 488 | |
f6970ad3 NB |
489 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
490 | if (!ibr) | |
491 | goto fail; | |
492 | cmd->priv = ibr; | |
493 | ||
e742fc32 | 494 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE, 0); |
f6970ad3 NB |
495 | if (!bio) |
496 | goto fail_free_ibr; | |
497 | ||
498 | bio_list_init(&list); | |
499 | bio_list_add(&list, bio); | |
500 | ||
5981c245 | 501 | refcount_set(&ibr->pending, 1); |
f6970ad3 NB |
502 | |
503 | while (sectors) { | |
504 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
505 | != sg->length) { | |
506 | ||
e742fc32 MC |
507 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE, |
508 | 0); | |
f6970ad3 NB |
509 | if (!bio) |
510 | goto fail_put_bios; | |
511 | ||
5981c245 | 512 | refcount_inc(&ibr->pending); |
f6970ad3 NB |
513 | bio_list_add(&list, bio); |
514 | } | |
515 | ||
516 | /* Always in 512 byte units for Linux/Block */ | |
80b045b3 | 517 | block_lba += sg->length >> SECTOR_SHIFT; |
f6970ad3 NB |
518 | sectors -= 1; |
519 | } | |
520 | ||
4e49ea4a | 521 | iblock_submit_bios(&list); |
f6970ad3 NB |
522 | return 0; |
523 | ||
524 | fail_put_bios: | |
525 | while ((bio = bio_list_pop(&list))) | |
526 | bio_put(bio); | |
527 | fail_free_ibr: | |
528 | kfree(ibr); | |
529 | fail: | |
530 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
531 | } | |
532 | ||
c66ac9db | 533 | enum { |
44bfd018 | 534 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
535 | }; |
536 | ||
537 | static match_table_t tokens = { | |
538 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 539 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
540 | {Opt_force, "force=%d"}, |
541 | {Opt_err, NULL} | |
542 | }; | |
543 | ||
0fd97ccf CH |
544 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
545 | const char *page, ssize_t count) | |
c66ac9db | 546 | { |
0fd97ccf | 547 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 548 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 549 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 550 | int ret = 0, token; |
44bfd018 | 551 | unsigned long tmp_readonly; |
c66ac9db NB |
552 | |
553 | opts = kstrdup(page, GFP_KERNEL); | |
554 | if (!opts) | |
555 | return -ENOMEM; | |
556 | ||
557 | orig = opts; | |
558 | ||
90c161b6 | 559 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
560 | if (!*ptr) |
561 | continue; | |
562 | ||
563 | token = match_token(ptr, tokens, args); | |
564 | switch (token) { | |
565 | case Opt_udev_path: | |
566 | if (ib_dev->ibd_bd) { | |
6708bb27 | 567 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
568 | " ib_dev->ibd_bd exists\n"); |
569 | ret = -EEXIST; | |
570 | goto out; | |
571 | } | |
852b6ed1 NB |
572 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
573 | SE_UDEV_PATH_LEN) == 0) { | |
574 | ret = -EINVAL; | |
6d180253 JJ |
575 | break; |
576 | } | |
6708bb27 | 577 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
578 | ib_dev->ibd_udev_path); |
579 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
580 | break; | |
44bfd018 AG |
581 | case Opt_readonly: |
582 | arg_p = match_strdup(&args[0]); | |
583 | if (!arg_p) { | |
584 | ret = -ENOMEM; | |
585 | break; | |
586 | } | |
57103d7f | 587 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
588 | kfree(arg_p); |
589 | if (ret < 0) { | |
57103d7f | 590 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
591 | " readonly=\n"); |
592 | goto out; | |
593 | } | |
594 | ib_dev->ibd_readonly = tmp_readonly; | |
595 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
596 | break; | |
c66ac9db | 597 | case Opt_force: |
c66ac9db NB |
598 | break; |
599 | default: | |
600 | break; | |
601 | } | |
602 | } | |
603 | ||
604 | out: | |
605 | kfree(orig); | |
606 | return (!ret) ? count : ret; | |
607 | } | |
608 | ||
0fd97ccf | 609 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 610 | { |
0fd97ccf CH |
611 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
612 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
613 | char buf[BDEVNAME_SIZE]; |
614 | ssize_t bl = 0; | |
615 | ||
616 | if (bd) | |
617 | bl += sprintf(b + bl, "iBlock device: %s", | |
618 | bdevname(bd, buf)); | |
0fd97ccf | 619 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 620 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
621 | ib_dev->ibd_udev_path); |
622 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
623 | |
624 | bl += sprintf(b + bl, " "); | |
625 | if (bd) { | |
626 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 627 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 628 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
629 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
630 | } else { | |
21bca31c | 631 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
632 | } |
633 | ||
634 | return bl; | |
635 | } | |
636 | ||
ecebbf6c | 637 | static int |
fed564f6 GE |
638 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, |
639 | struct sg_mapping_iter *miter) | |
ecebbf6c NB |
640 | { |
641 | struct se_device *dev = cmd->se_dev; | |
642 | struct blk_integrity *bi; | |
643 | struct bio_integrity_payload *bip; | |
644 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
fed564f6 GE |
645 | int rc; |
646 | size_t resid, len; | |
ecebbf6c NB |
647 | |
648 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
649 | if (!bi) { | |
650 | pr_err("Unable to locate bio_integrity\n"); | |
651 | return -ENODEV; | |
652 | } | |
653 | ||
fed564f6 GE |
654 | bip = bio_integrity_alloc(bio, GFP_NOIO, |
655 | min_t(unsigned int, cmd->t_prot_nents, BIO_MAX_PAGES)); | |
06c1e390 | 656 | if (IS_ERR(bip)) { |
ecebbf6c | 657 | pr_err("Unable to allocate bio_integrity_payload\n"); |
06c1e390 | 658 | return PTR_ERR(bip); |
ecebbf6c NB |
659 | } |
660 | ||
fed564f6 GE |
661 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); |
662 | bip_set_seed(bip, bio->bi_iter.bi_sector); | |
ecebbf6c | 663 | |
4e13c5d0 LT |
664 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
665 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c | 666 | |
fed564f6 GE |
667 | resid = bip->bip_iter.bi_size; |
668 | while (resid > 0 && sg_miter_next(miter)) { | |
ecebbf6c | 669 | |
fed564f6 GE |
670 | len = min_t(size_t, miter->length, resid); |
671 | rc = bio_integrity_add_page(bio, miter->page, len, | |
672 | offset_in_page(miter->addr)); | |
673 | if (rc != len) { | |
ecebbf6c | 674 | pr_err("bio_integrity_add_page() failed; %d\n", rc); |
fed564f6 | 675 | sg_miter_stop(miter); |
ecebbf6c NB |
676 | return -ENOMEM; |
677 | } | |
678 | ||
fed564f6 GE |
679 | pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", |
680 | miter->page, len, offset_in_page(miter->addr)); | |
681 | ||
682 | resid -= len; | |
683 | if (len < miter->length) | |
684 | miter->consumed -= miter->length - len; | |
ecebbf6c | 685 | } |
fed564f6 | 686 | sg_miter_stop(miter); |
ecebbf6c NB |
687 | |
688 | return 0; | |
689 | } | |
690 | ||
de103c93 | 691 | static sense_reason_t |
a82a9538 NB |
692 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
693 | enum dma_data_direction data_direction) | |
c66ac9db | 694 | { |
5951146d | 695 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 696 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
5787cacd | 697 | struct iblock_req *ibr; |
fed564f6 | 698 | struct bio *bio; |
dbbf3e94 | 699 | struct bio_list list; |
c66ac9db | 700 | struct scatterlist *sg; |
5787cacd | 701 | u32 sg_num = sgl_nents; |
d5b4a21b | 702 | unsigned bio_cnt; |
fed564f6 GE |
703 | int i, rc, op, op_flags = 0; |
704 | struct sg_mapping_iter prot_miter; | |
dbbf3e94 | 705 | |
5787cacd | 706 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
707 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
708 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 709 | /* |
70fd7614 | 710 | * Force writethrough using REQ_FUA if a volatile write cache |
d0c8b259 | 711 | * is not enabled, or if initiator set the Force Unit Access bit. |
dbbf3e94 | 712 | */ |
e742fc32 | 713 | op = REQ_OP_WRITE; |
c888a8f9 | 714 | if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
d0c8b259 | 715 | if (cmd->se_cmd_flags & SCF_FUA) |
70fd7614 | 716 | op_flags = REQ_FUA; |
c888a8f9 | 717 | else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
70fd7614 | 718 | op_flags = REQ_FUA; |
d0c8b259 | 719 | } |
dbbf3e94 | 720 | } else { |
e742fc32 | 721 | op = REQ_OP_READ; |
dbbf3e94 CH |
722 | } |
723 | ||
5787cacd CH |
724 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
725 | if (!ibr) | |
726 | goto fail; | |
727 | cmd->priv = ibr; | |
728 | ||
e0de4457 | 729 | if (!sgl_nents) { |
5981c245 | 730 | refcount_set(&ibr->pending, 1); |
e0de4457 PB |
731 | iblock_complete_cmd(cmd); |
732 | return 0; | |
733 | } | |
734 | ||
e742fc32 | 735 | bio = iblock_get_bio(cmd, block_lba, sgl_nents, op, op_flags); |
5787cacd CH |
736 | if (!bio) |
737 | goto fail_free_ibr; | |
dbbf3e94 CH |
738 | |
739 | bio_list_init(&list); | |
740 | bio_list_add(&list, bio); | |
5787cacd | 741 | |
5981c245 | 742 | refcount_set(&ibr->pending, 2); |
d5b4a21b | 743 | bio_cnt = 1; |
c66ac9db | 744 | |
fed564f6 GE |
745 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) |
746 | sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, | |
747 | op == REQ_OP_READ ? SG_MITER_FROM_SG : | |
748 | SG_MITER_TO_SG); | |
749 | ||
5787cacd | 750 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
751 | /* |
752 | * XXX: if the length the device accepts is shorter than the | |
753 | * length of the S/G list entry this will cause and | |
754 | * endless loop. Better hope no driver uses huge pages. | |
755 | */ | |
756 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
757 | != sg->length) { | |
fed564f6 GE |
758 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
759 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); | |
760 | if (rc) | |
761 | goto fail_put_bios; | |
762 | } | |
763 | ||
d5b4a21b | 764 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
4e49ea4a | 765 | iblock_submit_bios(&list); |
d5b4a21b CH |
766 | bio_cnt = 0; |
767 | } | |
768 | ||
e742fc32 MC |
769 | bio = iblock_get_bio(cmd, block_lba, sg_num, op, |
770 | op_flags); | |
6708bb27 | 771 | if (!bio) |
5787cacd CH |
772 | goto fail_put_bios; |
773 | ||
5981c245 | 774 | refcount_inc(&ibr->pending); |
dbbf3e94 | 775 | bio_list_add(&list, bio); |
d5b4a21b | 776 | bio_cnt++; |
c66ac9db | 777 | } |
dbbf3e94 | 778 | |
c66ac9db | 779 | /* Always in 512 byte units for Linux/Block */ |
80b045b3 | 780 | block_lba += sg->length >> SECTOR_SHIFT; |
c66ac9db | 781 | sg_num--; |
c66ac9db NB |
782 | } |
783 | ||
6f16ec43 | 784 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
fed564f6 | 785 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); |
ecebbf6c NB |
786 | if (rc) |
787 | goto fail_put_bios; | |
788 | } | |
789 | ||
4e49ea4a | 790 | iblock_submit_bios(&list); |
5787cacd | 791 | iblock_complete_cmd(cmd); |
03e98c9e | 792 | return 0; |
dbbf3e94 | 793 | |
5787cacd | 794 | fail_put_bios: |
dbbf3e94 | 795 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 796 | bio_put(bio); |
5787cacd CH |
797 | fail_free_ibr: |
798 | kfree(ibr); | |
5787cacd | 799 | fail: |
de103c93 | 800 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
801 | } |
802 | ||
c66ac9db NB |
803 | static sector_t iblock_get_blocks(struct se_device *dev) |
804 | { | |
0fd97ccf CH |
805 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
806 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
807 | struct request_queue *q = bdev_get_queue(bd); |
808 | ||
809 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
810 | } | |
811 | ||
7f7caf6a AG |
812 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
813 | { | |
814 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
815 | struct block_device *bd = ib_dev->ibd_bd; | |
816 | int ret; | |
817 | ||
818 | ret = bdev_alignment_offset(bd); | |
819 | if (ret == -1) | |
820 | return 0; | |
821 | ||
822 | /* convert offset-bytes to offset-lbas */ | |
823 | return ret / bdev_logical_block_size(bd); | |
824 | } | |
825 | ||
826 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
827 | { | |
828 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
829 | struct block_device *bd = ib_dev->ibd_bd; | |
830 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
831 | ||
832 | return ilog2(logs_per_phys); | |
833 | } | |
834 | ||
835 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
836 | { | |
837 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
838 | struct block_device *bd = ib_dev->ibd_bd; | |
839 | ||
840 | return bdev_io_min(bd); | |
841 | } | |
842 | ||
843 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
844 | { | |
845 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
846 | struct block_device *bd = ib_dev->ibd_bd; | |
847 | ||
848 | return bdev_io_opt(bd); | |
849 | } | |
850 | ||
9e999a6c | 851 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 852 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 853 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 854 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 855 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
856 | }; |
857 | ||
de103c93 CH |
858 | static sense_reason_t |
859 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 860 | { |
9e999a6c | 861 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
862 | } |
863 | ||
452e2010 | 864 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
865 | { |
866 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
867 | struct block_device *bd = ib_dev->ibd_bd; | |
868 | struct request_queue *q = bdev_get_queue(bd); | |
869 | ||
c888a8f9 | 870 | return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
d0c8b259 NB |
871 | } |
872 | ||
0a06d430 | 873 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 874 | .name = "iblock", |
0fd97ccf CH |
875 | .inquiry_prod = "IBLOCK", |
876 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 877 | .owner = THIS_MODULE, |
c66ac9db NB |
878 | .attach_hba = iblock_attach_hba, |
879 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
880 | .alloc_device = iblock_alloc_device, |
881 | .configure_device = iblock_configure_device, | |
92634706 | 882 | .destroy_device = iblock_destroy_device, |
c66ac9db | 883 | .free_device = iblock_free_device, |
0c2ad7d1 | 884 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
885 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
886 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 887 | .get_device_type = sbc_get_device_type, |
c66ac9db | 888 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
889 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
890 | .get_lbppbe = iblock_get_lbppbe, | |
891 | .get_io_min = iblock_get_io_min, | |
892 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 893 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 894 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
895 | }; |
896 | ||
897 | static int __init iblock_module_init(void) | |
898 | { | |
0a06d430 | 899 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
900 | } |
901 | ||
63b91d5a | 902 | static void __exit iblock_module_exit(void) |
c66ac9db | 903 | { |
0a06d430 | 904 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
905 | } |
906 | ||
907 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
908 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
909 | MODULE_LICENSE("GPL"); | |
910 | ||
911 | module_init(iblock_module_init); | |
912 | module_exit(iblock_module_exit); |