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 | |
011067b0 | 97 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
6708bb27 | 98 | if (!ib_dev->ibd_bio_set) { |
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) { | |
144 | struct bio_set *bs = ib_dev->ibd_bio_set; | |
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", | |
167 | bs->bio_integrity_pool); | |
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 CH |
176 | out_free_bioset: |
177 | bioset_free(ib_dev->ibd_bio_set); | |
178 | ib_dev->ibd_bio_set = NULL; | |
179 | out: | |
180 | return ret; | |
c66ac9db NB |
181 | } |
182 | ||
4cc987ea NB |
183 | static void iblock_dev_call_rcu(struct rcu_head *p) |
184 | { | |
185 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
186 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
187 | ||
188 | kfree(ib_dev); | |
189 | } | |
190 | ||
0fd97ccf | 191 | static void iblock_free_device(struct se_device *dev) |
92634706 MC |
192 | { |
193 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); | |
194 | } | |
195 | ||
196 | static void iblock_destroy_device(struct se_device *dev) | |
c66ac9db | 197 | { |
0fd97ccf | 198 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 199 | |
bc665524 NB |
200 | if (ib_dev->ibd_bd != NULL) |
201 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
d84287bc | 202 | if (ib_dev->ibd_bio_set != NULL) |
bc665524 | 203 | bioset_free(ib_dev->ibd_bio_set); |
c66ac9db NB |
204 | } |
205 | ||
c66ac9db NB |
206 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
207 | struct se_device *dev, | |
208 | struct block_device *bd, | |
209 | struct request_queue *q) | |
210 | { | |
211 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
212 | bdev_logical_block_size(bd)) - 1); | |
213 | u32 block_size = bdev_logical_block_size(bd); | |
214 | ||
0fd97ccf | 215 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
216 | return blocks_long; |
217 | ||
218 | switch (block_size) { | |
219 | case 4096: | |
0fd97ccf | 220 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
221 | case 2048: |
222 | blocks_long <<= 1; | |
223 | break; | |
224 | case 1024: | |
225 | blocks_long <<= 2; | |
226 | break; | |
227 | case 512: | |
228 | blocks_long <<= 3; | |
229 | default: | |
230 | break; | |
231 | } | |
232 | break; | |
233 | case 2048: | |
0fd97ccf | 234 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
235 | case 4096: |
236 | blocks_long >>= 1; | |
237 | break; | |
238 | case 1024: | |
239 | blocks_long <<= 1; | |
240 | break; | |
241 | case 512: | |
242 | blocks_long <<= 2; | |
243 | break; | |
244 | default: | |
245 | break; | |
246 | } | |
247 | break; | |
248 | case 1024: | |
0fd97ccf | 249 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
250 | case 4096: |
251 | blocks_long >>= 2; | |
252 | break; | |
253 | case 2048: | |
254 | blocks_long >>= 1; | |
255 | break; | |
256 | case 512: | |
257 | blocks_long <<= 1; | |
258 | break; | |
259 | default: | |
260 | break; | |
261 | } | |
262 | break; | |
263 | case 512: | |
0fd97ccf | 264 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
265 | case 4096: |
266 | blocks_long >>= 3; | |
267 | break; | |
268 | case 2048: | |
269 | blocks_long >>= 2; | |
270 | break; | |
271 | case 1024: | |
272 | blocks_long >>= 1; | |
273 | break; | |
274 | default: | |
275 | break; | |
276 | } | |
277 | break; | |
278 | default: | |
279 | break; | |
280 | } | |
281 | ||
282 | return blocks_long; | |
283 | } | |
284 | ||
3a41d85f NB |
285 | static void iblock_complete_cmd(struct se_cmd *cmd) |
286 | { | |
287 | struct iblock_req *ibr = cmd->priv; | |
288 | u8 status; | |
289 | ||
5981c245 | 290 | if (!refcount_dec_and_test(&ibr->pending)) |
3a41d85f NB |
291 | return; |
292 | ||
293 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
294 | status = SAM_STAT_CHECK_CONDITION; | |
295 | else | |
296 | status = SAM_STAT_GOOD; | |
297 | ||
298 | target_complete_cmd(cmd, status); | |
299 | kfree(ibr); | |
300 | } | |
301 | ||
4246a0b6 | 302 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
303 | { |
304 | struct se_cmd *cmd = bio->bi_private; | |
305 | struct iblock_req *ibr = cmd->priv; | |
306 | ||
4e4cbee9 CH |
307 | if (bio->bi_status) { |
308 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); | |
3a41d85f NB |
309 | /* |
310 | * Bump the ib_bio_err_cnt and release bio. | |
311 | */ | |
312 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 313 | smp_mb__after_atomic(); |
3a41d85f NB |
314 | } |
315 | ||
316 | bio_put(bio); | |
317 | ||
318 | iblock_complete_cmd(cmd); | |
319 | } | |
320 | ||
321 | static struct bio * | |
e742fc32 MC |
322 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, int op, |
323 | int op_flags) | |
3a41d85f NB |
324 | { |
325 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
326 | struct bio *bio; | |
327 | ||
328 | /* | |
329 | * Only allocate as many vector entries as the bio code allows us to, | |
330 | * we'll loop later on until we have handled the whole request. | |
331 | */ | |
332 | if (sg_num > BIO_MAX_PAGES) | |
333 | sg_num = BIO_MAX_PAGES; | |
334 | ||
335 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
336 | if (!bio) { | |
337 | pr_err("Unable to allocate memory for bio\n"); | |
338 | return NULL; | |
339 | } | |
340 | ||
74d46992 | 341 | bio_set_dev(bio, ib_dev->ibd_bd); |
3a41d85f NB |
342 | bio->bi_private = cmd; |
343 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 344 | bio->bi_iter.bi_sector = lba; |
e742fc32 | 345 | bio_set_op_attrs(bio, op, op_flags); |
3a41d85f NB |
346 | |
347 | return bio; | |
348 | } | |
349 | ||
4e49ea4a | 350 | static void iblock_submit_bios(struct bio_list *list) |
3a41d85f NB |
351 | { |
352 | struct blk_plug plug; | |
353 | struct bio *bio; | |
354 | ||
355 | blk_start_plug(&plug); | |
356 | while ((bio = bio_list_pop(list))) | |
4e49ea4a | 357 | submit_bio(bio); |
3a41d85f NB |
358 | blk_finish_plug(&plug); |
359 | } | |
360 | ||
4246a0b6 | 361 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
362 | { |
363 | struct se_cmd *cmd = bio->bi_private; | |
364 | ||
4e4cbee9 CH |
365 | if (bio->bi_status) |
366 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); | |
df5fa691 | 367 | |
5787cacd | 368 | if (cmd) { |
4e4cbee9 | 369 | if (bio->bi_status) |
5787cacd | 370 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 371 | else |
5787cacd | 372 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
373 | } |
374 | ||
df5fa691 CH |
375 | bio_put(bio); |
376 | } | |
377 | ||
c66ac9db | 378 | /* |
df5fa691 CH |
379 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
380 | * always flush the whole cache. | |
c66ac9db | 381 | */ |
de103c93 CH |
382 | static sense_reason_t |
383 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 384 | { |
0fd97ccf | 385 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 386 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 387 | struct bio *bio; |
c66ac9db NB |
388 | |
389 | /* | |
390 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 391 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
392 | */ |
393 | if (immed) | |
5787cacd | 394 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 395 | |
df5fa691 CH |
396 | bio = bio_alloc(GFP_KERNEL, 0); |
397 | bio->bi_end_io = iblock_end_io_flush; | |
74d46992 | 398 | bio_set_dev(bio, ib_dev->ibd_bd); |
70fd7614 | 399 | bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
c66ac9db | 400 | if (!immed) |
df5fa691 | 401 | bio->bi_private = cmd; |
4e49ea4a | 402 | submit_bio(bio); |
ad67f0d9 | 403 | return 0; |
c66ac9db NB |
404 | } |
405 | ||
dbc21c5a | 406 | static sense_reason_t |
62e46942 | 407 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 408 | { |
62e46942 | 409 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 410 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
411 | int ret; |
412 | ||
8a9ebe71 MC |
413 | ret = blkdev_issue_discard(bdev, |
414 | target_to_linux_sector(dev, lba), | |
415 | target_to_linux_sector(dev, nolb), | |
416 | GFP_KERNEL, 0); | |
dbc21c5a AH |
417 | if (ret < 0) { |
418 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
419 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
420 | } | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
07b63196 | 425 | static sense_reason_t |
2237498f | 426 | iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) |
07b63196 MC |
427 | { |
428 | struct se_device *dev = cmd->se_dev; | |
429 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
2237498f NB |
430 | unsigned char *buf, zero = 0x00, *p = &zero; |
431 | int rc, ret; | |
07b63196 | 432 | |
2237498f NB |
433 | buf = kmap(sg_page(sg)) + sg->offset; |
434 | if (!buf) | |
435 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
436 | /* | |
437 | * Fall back to block_execute_write_same() slow-path if | |
438 | * incoming WRITE_SAME payload does not contain zeros. | |
439 | */ | |
440 | rc = memcmp(buf, p, cmd->data_length); | |
441 | kunmap(sg_page(sg)); | |
07b63196 | 442 | |
2237498f NB |
443 | if (rc) |
444 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
07b63196 | 445 | |
2237498f | 446 | ret = blkdev_issue_zeroout(bdev, |
07b63196 MC |
447 | target_to_linux_sector(dev, cmd->t_task_lba), |
448 | target_to_linux_sector(dev, | |
449 | sbc_get_write_same_sectors(cmd)), | |
2237498f | 450 | GFP_KERNEL, false); |
07b63196 MC |
451 | if (ret) |
452 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
453 | ||
454 | target_complete_cmd(cmd, GOOD); | |
455 | return 0; | |
456 | } | |
457 | ||
f6970ad3 NB |
458 | static sense_reason_t |
459 | iblock_execute_write_same(struct se_cmd *cmd) | |
460 | { | |
07b63196 | 461 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
462 | struct iblock_req *ibr; |
463 | struct scatterlist *sg; | |
464 | struct bio *bio; | |
465 | struct bio_list list; | |
8a9ebe71 MC |
466 | struct se_device *dev = cmd->se_dev; |
467 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
468 | sector_t sectors = target_to_linux_sector(dev, | |
469 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 470 | |
afd73f1b NB |
471 | if (cmd->prot_op) { |
472 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
473 | " backends not supported\n"); | |
474 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
475 | } | |
f6970ad3 NB |
476 | sg = &cmd->t_data_sg[0]; |
477 | ||
478 | if (cmd->t_data_nents > 1 || | |
479 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
480 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
481 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
482 | cmd->se_dev->dev_attrib.block_size); | |
483 | return TCM_INVALID_CDB_FIELD; | |
484 | } | |
485 | ||
2237498f NB |
486 | if (bdev_write_zeroes_sectors(bdev)) { |
487 | if (!iblock_execute_zero_out(bdev, cmd)) | |
488 | return 0; | |
489 | } | |
07b63196 | 490 | |
f6970ad3 NB |
491 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
492 | if (!ibr) | |
493 | goto fail; | |
494 | cmd->priv = ibr; | |
495 | ||
e742fc32 | 496 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE, 0); |
f6970ad3 NB |
497 | if (!bio) |
498 | goto fail_free_ibr; | |
499 | ||
500 | bio_list_init(&list); | |
501 | bio_list_add(&list, bio); | |
502 | ||
5981c245 | 503 | refcount_set(&ibr->pending, 1); |
f6970ad3 NB |
504 | |
505 | while (sectors) { | |
506 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
507 | != sg->length) { | |
508 | ||
e742fc32 MC |
509 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE, |
510 | 0); | |
f6970ad3 NB |
511 | if (!bio) |
512 | goto fail_put_bios; | |
513 | ||
5981c245 | 514 | refcount_inc(&ibr->pending); |
f6970ad3 NB |
515 | bio_list_add(&list, bio); |
516 | } | |
517 | ||
518 | /* Always in 512 byte units for Linux/Block */ | |
519 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
520 | sectors -= 1; | |
521 | } | |
522 | ||
4e49ea4a | 523 | iblock_submit_bios(&list); |
f6970ad3 NB |
524 | return 0; |
525 | ||
526 | fail_put_bios: | |
527 | while ((bio = bio_list_pop(&list))) | |
528 | bio_put(bio); | |
529 | fail_free_ibr: | |
530 | kfree(ibr); | |
531 | fail: | |
532 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
533 | } | |
534 | ||
c66ac9db | 535 | enum { |
44bfd018 | 536 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
537 | }; |
538 | ||
539 | static match_table_t tokens = { | |
540 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 541 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
542 | {Opt_force, "force=%d"}, |
543 | {Opt_err, NULL} | |
544 | }; | |
545 | ||
0fd97ccf CH |
546 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
547 | const char *page, ssize_t count) | |
c66ac9db | 548 | { |
0fd97ccf | 549 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 550 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 551 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 552 | int ret = 0, token; |
44bfd018 | 553 | unsigned long tmp_readonly; |
c66ac9db NB |
554 | |
555 | opts = kstrdup(page, GFP_KERNEL); | |
556 | if (!opts) | |
557 | return -ENOMEM; | |
558 | ||
559 | orig = opts; | |
560 | ||
90c161b6 | 561 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
562 | if (!*ptr) |
563 | continue; | |
564 | ||
565 | token = match_token(ptr, tokens, args); | |
566 | switch (token) { | |
567 | case Opt_udev_path: | |
568 | if (ib_dev->ibd_bd) { | |
6708bb27 | 569 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
570 | " ib_dev->ibd_bd exists\n"); |
571 | ret = -EEXIST; | |
572 | goto out; | |
573 | } | |
852b6ed1 NB |
574 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
575 | SE_UDEV_PATH_LEN) == 0) { | |
576 | ret = -EINVAL; | |
6d180253 JJ |
577 | break; |
578 | } | |
6708bb27 | 579 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
580 | ib_dev->ibd_udev_path); |
581 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
582 | break; | |
44bfd018 AG |
583 | case Opt_readonly: |
584 | arg_p = match_strdup(&args[0]); | |
585 | if (!arg_p) { | |
586 | ret = -ENOMEM; | |
587 | break; | |
588 | } | |
57103d7f | 589 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
590 | kfree(arg_p); |
591 | if (ret < 0) { | |
57103d7f | 592 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
593 | " readonly=\n"); |
594 | goto out; | |
595 | } | |
596 | ib_dev->ibd_readonly = tmp_readonly; | |
597 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
598 | break; | |
c66ac9db | 599 | case Opt_force: |
c66ac9db NB |
600 | break; |
601 | default: | |
602 | break; | |
603 | } | |
604 | } | |
605 | ||
606 | out: | |
607 | kfree(orig); | |
608 | return (!ret) ? count : ret; | |
609 | } | |
610 | ||
0fd97ccf | 611 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 612 | { |
0fd97ccf CH |
613 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
614 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
615 | char buf[BDEVNAME_SIZE]; |
616 | ssize_t bl = 0; | |
617 | ||
618 | if (bd) | |
619 | bl += sprintf(b + bl, "iBlock device: %s", | |
620 | bdevname(bd, buf)); | |
0fd97ccf | 621 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 622 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
623 | ib_dev->ibd_udev_path); |
624 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
625 | |
626 | bl += sprintf(b + bl, " "); | |
627 | if (bd) { | |
628 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 629 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 630 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
631 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
632 | } else { | |
21bca31c | 633 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
634 | } |
635 | ||
636 | return bl; | |
637 | } | |
638 | ||
ecebbf6c NB |
639 | static int |
640 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) | |
641 | { | |
642 | struct se_device *dev = cmd->se_dev; | |
643 | struct blk_integrity *bi; | |
644 | struct bio_integrity_payload *bip; | |
645 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
646 | struct scatterlist *sg; | |
647 | int i, rc; | |
648 | ||
649 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
650 | if (!bi) { | |
651 | pr_err("Unable to locate bio_integrity\n"); | |
652 | return -ENODEV; | |
653 | } | |
654 | ||
655 | bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); | |
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 | ||
4e13c5d0 | 661 | bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
ecebbf6c | 662 | dev->prot_length; |
4e13c5d0 | 663 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
ecebbf6c | 664 | |
4e13c5d0 LT |
665 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
666 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c NB |
667 | |
668 | for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { | |
669 | ||
670 | rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, | |
671 | sg->offset); | |
672 | if (rc != sg->length) { | |
673 | pr_err("bio_integrity_add_page() failed; %d\n", rc); | |
674 | return -ENOMEM; | |
675 | } | |
676 | ||
677 | pr_debug("Added bio integrity page: %p length: %d offset; %d\n", | |
678 | sg_page(sg), sg->length, sg->offset); | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
de103c93 | 684 | static sense_reason_t |
a82a9538 NB |
685 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
686 | enum dma_data_direction data_direction) | |
c66ac9db | 687 | { |
5951146d | 688 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 689 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
5787cacd | 690 | struct iblock_req *ibr; |
ecebbf6c | 691 | struct bio *bio, *bio_start; |
dbbf3e94 | 692 | struct bio_list list; |
c66ac9db | 693 | struct scatterlist *sg; |
5787cacd | 694 | u32 sg_num = sgl_nents; |
d5b4a21b | 695 | unsigned bio_cnt; |
e742fc32 | 696 | int i, op, op_flags = 0; |
dbbf3e94 | 697 | |
5787cacd | 698 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
699 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
700 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 701 | /* |
70fd7614 | 702 | * Force writethrough using REQ_FUA if a volatile write cache |
d0c8b259 | 703 | * is not enabled, or if initiator set the Force Unit Access bit. |
dbbf3e94 | 704 | */ |
e742fc32 | 705 | op = REQ_OP_WRITE; |
c888a8f9 | 706 | if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
d0c8b259 | 707 | if (cmd->se_cmd_flags & SCF_FUA) |
70fd7614 | 708 | op_flags = REQ_FUA; |
c888a8f9 | 709 | else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
70fd7614 | 710 | op_flags = REQ_FUA; |
d0c8b259 | 711 | } |
dbbf3e94 | 712 | } else { |
e742fc32 | 713 | op = REQ_OP_READ; |
dbbf3e94 CH |
714 | } |
715 | ||
5787cacd CH |
716 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
717 | if (!ibr) | |
718 | goto fail; | |
719 | cmd->priv = ibr; | |
720 | ||
e0de4457 | 721 | if (!sgl_nents) { |
5981c245 | 722 | refcount_set(&ibr->pending, 1); |
e0de4457 PB |
723 | iblock_complete_cmd(cmd); |
724 | return 0; | |
725 | } | |
726 | ||
e742fc32 | 727 | bio = iblock_get_bio(cmd, block_lba, sgl_nents, op, op_flags); |
5787cacd CH |
728 | if (!bio) |
729 | goto fail_free_ibr; | |
dbbf3e94 | 730 | |
ecebbf6c | 731 | bio_start = bio; |
dbbf3e94 CH |
732 | bio_list_init(&list); |
733 | bio_list_add(&list, bio); | |
5787cacd | 734 | |
5981c245 | 735 | refcount_set(&ibr->pending, 2); |
d5b4a21b | 736 | bio_cnt = 1; |
c66ac9db | 737 | |
5787cacd | 738 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
739 | /* |
740 | * XXX: if the length the device accepts is shorter than the | |
741 | * length of the S/G list entry this will cause and | |
742 | * endless loop. Better hope no driver uses huge pages. | |
743 | */ | |
744 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
745 | != sg->length) { | |
d5b4a21b | 746 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
4e49ea4a | 747 | iblock_submit_bios(&list); |
d5b4a21b CH |
748 | bio_cnt = 0; |
749 | } | |
750 | ||
e742fc32 MC |
751 | bio = iblock_get_bio(cmd, block_lba, sg_num, op, |
752 | op_flags); | |
6708bb27 | 753 | if (!bio) |
5787cacd CH |
754 | goto fail_put_bios; |
755 | ||
5981c245 | 756 | refcount_inc(&ibr->pending); |
dbbf3e94 | 757 | bio_list_add(&list, bio); |
d5b4a21b | 758 | bio_cnt++; |
c66ac9db | 759 | } |
dbbf3e94 | 760 | |
c66ac9db NB |
761 | /* Always in 512 byte units for Linux/Block */ |
762 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
763 | sg_num--; | |
c66ac9db NB |
764 | } |
765 | ||
6f16ec43 | 766 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
ecebbf6c NB |
767 | int rc = iblock_alloc_bip(cmd, bio_start); |
768 | if (rc) | |
769 | goto fail_put_bios; | |
770 | } | |
771 | ||
4e49ea4a | 772 | iblock_submit_bios(&list); |
5787cacd | 773 | iblock_complete_cmd(cmd); |
03e98c9e | 774 | return 0; |
dbbf3e94 | 775 | |
5787cacd | 776 | fail_put_bios: |
dbbf3e94 | 777 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 778 | bio_put(bio); |
5787cacd CH |
779 | fail_free_ibr: |
780 | kfree(ibr); | |
5787cacd | 781 | fail: |
de103c93 | 782 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
783 | } |
784 | ||
c66ac9db NB |
785 | static sector_t iblock_get_blocks(struct se_device *dev) |
786 | { | |
0fd97ccf CH |
787 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
788 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
789 | struct request_queue *q = bdev_get_queue(bd); |
790 | ||
791 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
792 | } | |
793 | ||
7f7caf6a AG |
794 | static sector_t iblock_get_alignment_offset_lbas(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 ret; | |
799 | ||
800 | ret = bdev_alignment_offset(bd); | |
801 | if (ret == -1) | |
802 | return 0; | |
803 | ||
804 | /* convert offset-bytes to offset-lbas */ | |
805 | return ret / bdev_logical_block_size(bd); | |
806 | } | |
807 | ||
808 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
809 | { | |
810 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
811 | struct block_device *bd = ib_dev->ibd_bd; | |
812 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
813 | ||
814 | return ilog2(logs_per_phys); | |
815 | } | |
816 | ||
817 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
818 | { | |
819 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
820 | struct block_device *bd = ib_dev->ibd_bd; | |
821 | ||
822 | return bdev_io_min(bd); | |
823 | } | |
824 | ||
825 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
826 | { | |
827 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
828 | struct block_device *bd = ib_dev->ibd_bd; | |
829 | ||
830 | return bdev_io_opt(bd); | |
831 | } | |
832 | ||
9e999a6c | 833 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 834 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 835 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 836 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 837 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
838 | }; |
839 | ||
de103c93 CH |
840 | static sense_reason_t |
841 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 842 | { |
9e999a6c | 843 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
844 | } |
845 | ||
452e2010 | 846 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
847 | { |
848 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
849 | struct block_device *bd = ib_dev->ibd_bd; | |
850 | struct request_queue *q = bdev_get_queue(bd); | |
851 | ||
c888a8f9 | 852 | return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
d0c8b259 NB |
853 | } |
854 | ||
0a06d430 | 855 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 856 | .name = "iblock", |
0fd97ccf CH |
857 | .inquiry_prod = "IBLOCK", |
858 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 859 | .owner = THIS_MODULE, |
c66ac9db NB |
860 | .attach_hba = iblock_attach_hba, |
861 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
862 | .alloc_device = iblock_alloc_device, |
863 | .configure_device = iblock_configure_device, | |
92634706 | 864 | .destroy_device = iblock_destroy_device, |
c66ac9db | 865 | .free_device = iblock_free_device, |
0c2ad7d1 | 866 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
867 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
868 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 869 | .get_device_type = sbc_get_device_type, |
c66ac9db | 870 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
871 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
872 | .get_lbppbe = iblock_get_lbppbe, | |
873 | .get_io_min = iblock_get_io_min, | |
874 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 875 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 876 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
877 | }; |
878 | ||
879 | static int __init iblock_module_init(void) | |
880 | { | |
0a06d430 | 881 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
882 | } |
883 | ||
63b91d5a | 884 | static void __exit iblock_module_exit(void) |
c66ac9db | 885 | { |
0a06d430 | 886 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
887 | } |
888 | ||
889 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
890 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
891 | MODULE_LICENSE("GPL"); | |
892 | ||
893 | module_init(iblock_module_init); | |
894 | module_exit(iblock_module_exit); |