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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c66ac9db NB |
2 | /******************************************************************************* |
3 | * Filename: target_core_iblock.c | |
4 | * | |
5 | * This file contains the Storage Engine <-> Linux BlockIO transport | |
6 | * specific functions. | |
7 | * | |
4c76251e | 8 | * (c) Copyright 2003-2013 Datera, Inc. |
c66ac9db NB |
9 | * |
10 | * Nicholas A. Bellinger <nab@kernel.org> | |
11 | * | |
c66ac9db NB |
12 | ******************************************************************************/ |
13 | ||
c66ac9db NB |
14 | #include <linux/string.h> |
15 | #include <linux/parser.h> | |
16 | #include <linux/timer.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/spinlock.h> | |
c66ac9db NB |
21 | #include <linux/bio.h> |
22 | #include <linux/genhd.h> | |
23 | #include <linux/file.h> | |
827509e3 | 24 | #include <linux/module.h> |
ba929992 | 25 | #include <scsi/scsi_proto.h> |
14150a6b | 26 | #include <asm/unaligned.h> |
c66ac9db NB |
27 | |
28 | #include <target/target_core_base.h> | |
c4795fb2 | 29 | #include <target/target_core_backend.h> |
c66ac9db NB |
30 | |
31 | #include "target_core_iblock.h" | |
32 | ||
d5b4a21b CH |
33 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
34 | #define IBLOCK_BIO_POOL_SIZE 128 | |
35 | ||
0fd97ccf CH |
36 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
37 | { | |
38 | return container_of(dev, struct iblock_dev, dev); | |
39 | } | |
40 | ||
41 | ||
c66ac9db NB |
42 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
43 | { | |
6708bb27 | 44 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db | 45 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 46 | IBLOCK_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
47 | return 0; |
48 | } | |
49 | ||
50 | static void iblock_detach_hba(struct se_hba *hba) | |
51 | { | |
c66ac9db NB |
52 | } |
53 | ||
0fd97ccf | 54 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
55 | { |
56 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
57 | |
58 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
59 | if (!ib_dev) { |
60 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
61 | return NULL; |
62 | } | |
c66ac9db | 63 | |
6708bb27 | 64 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 65 | |
0fd97ccf | 66 | return &ib_dev->dev; |
c66ac9db NB |
67 | } |
68 | ||
0fd97ccf | 69 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 70 | { |
0fd97ccf | 71 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 72 | struct request_queue *q; |
0fd97ccf | 73 | struct block_device *bd = NULL; |
ecebbf6c | 74 | struct blk_integrity *bi; |
44bfd018 | 75 | fmode_t mode; |
2237498f | 76 | unsigned int max_write_zeroes_sectors; |
0fd97ccf | 77 | int ret = -ENOMEM; |
c66ac9db | 78 | |
0fd97ccf CH |
79 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
80 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
81 | return -EINVAL; | |
c66ac9db | 82 | } |
d5b4a21b | 83 | |
a47a28b7 KO |
84 | ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
85 | if (ret) { | |
0fd97ccf CH |
86 | pr_err("IBLOCK: Unable to create bioset\n"); |
87 | goto out; | |
c66ac9db | 88 | } |
0fd97ccf | 89 | |
6708bb27 | 90 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
91 | ib_dev->ibd_udev_path); |
92 | ||
44bfd018 AG |
93 | mode = FMODE_READ|FMODE_EXCL; |
94 | if (!ib_dev->ibd_readonly) | |
95 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
96 | else |
97 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
98 | |
99 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
100 | if (IS_ERR(bd)) { |
101 | ret = PTR_ERR(bd); | |
0fd97ccf | 102 | goto out_free_bioset; |
613640e4 | 103 | } |
c66ac9db NB |
104 | ib_dev->ibd_bd = bd; |
105 | ||
0fd97ccf CH |
106 | q = bdev_get_queue(bd); |
107 | ||
108 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
046ba642 | 109 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
0fd97ccf | 110 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 111 | |
ea263c7f | 112 | if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) |
6708bb27 | 113 | pr_debug("IBLOCK: BLOCK Discard support available," |
8a9ebe71 MC |
114 | " disabled by default\n"); |
115 | ||
f6970ad3 NB |
116 | /* |
117 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
118 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
119 | */ | |
2237498f NB |
120 | max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); |
121 | if (max_write_zeroes_sectors) | |
122 | dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; | |
123 | else | |
124 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 125 | |
e22a7f07 | 126 | if (blk_queue_nonrot(q)) |
0fd97ccf | 127 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 128 | |
ecebbf6c NB |
129 | bi = bdev_get_integrity(bd); |
130 | if (bi) { | |
a47a28b7 | 131 | struct bio_set *bs = &ib_dev->ibd_bio_set; |
ecebbf6c | 132 | |
0f8087ec MP |
133 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
134 | !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { | |
ecebbf6c | 135 | pr_err("IBLOCK export of blk_integrity: %s not" |
0f8087ec | 136 | " supported\n", bi->profile->name); |
ecebbf6c NB |
137 | ret = -ENOSYS; |
138 | goto out_blkdev_put; | |
139 | } | |
140 | ||
0f8087ec | 141 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
ecebbf6c | 142 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
0f8087ec | 143 | } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
ecebbf6c NB |
144 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
145 | } | |
146 | ||
147 | if (dev->dev_attrib.pi_prot_type) { | |
148 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
149 | pr_err("Unable to allocate bioset for PI\n"); | |
150 | ret = -ENOMEM; | |
151 | goto out_blkdev_put; | |
152 | } | |
153 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
f4f8154a | 154 | &bs->bio_integrity_pool); |
ecebbf6c NB |
155 | } |
156 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
157 | } | |
158 | ||
0fd97ccf | 159 | return 0; |
c66ac9db | 160 | |
ecebbf6c NB |
161 | out_blkdev_put: |
162 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf | 163 | out_free_bioset: |
a47a28b7 | 164 | bioset_exit(&ib_dev->ibd_bio_set); |
0fd97ccf CH |
165 | out: |
166 | return ret; | |
c66ac9db NB |
167 | } |
168 | ||
4cc987ea NB |
169 | static void iblock_dev_call_rcu(struct rcu_head *p) |
170 | { | |
171 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
172 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
173 | ||
174 | kfree(ib_dev); | |
175 | } | |
176 | ||
0fd97ccf | 177 | static void iblock_free_device(struct se_device *dev) |
92634706 MC |
178 | { |
179 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); | |
180 | } | |
181 | ||
182 | static void iblock_destroy_device(struct se_device *dev) | |
c66ac9db | 183 | { |
0fd97ccf | 184 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 185 | |
bc665524 NB |
186 | if (ib_dev->ibd_bd != NULL) |
187 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
a47a28b7 | 188 | bioset_exit(&ib_dev->ibd_bio_set); |
c66ac9db NB |
189 | } |
190 | ||
c66ac9db NB |
191 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
192 | struct se_device *dev, | |
193 | struct block_device *bd, | |
194 | struct request_queue *q) | |
195 | { | |
196 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
197 | bdev_logical_block_size(bd)) - 1); | |
198 | u32 block_size = bdev_logical_block_size(bd); | |
199 | ||
0fd97ccf | 200 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
201 | return blocks_long; |
202 | ||
203 | switch (block_size) { | |
204 | case 4096: | |
0fd97ccf | 205 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
206 | case 2048: |
207 | blocks_long <<= 1; | |
208 | break; | |
209 | case 1024: | |
210 | blocks_long <<= 2; | |
211 | break; | |
212 | case 512: | |
213 | blocks_long <<= 3; | |
214 | default: | |
215 | break; | |
216 | } | |
217 | break; | |
218 | case 2048: | |
0fd97ccf | 219 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
220 | case 4096: |
221 | blocks_long >>= 1; | |
222 | break; | |
223 | case 1024: | |
224 | blocks_long <<= 1; | |
225 | break; | |
226 | case 512: | |
227 | blocks_long <<= 2; | |
228 | break; | |
229 | default: | |
230 | break; | |
231 | } | |
232 | break; | |
233 | case 1024: | |
0fd97ccf | 234 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
235 | case 4096: |
236 | blocks_long >>= 2; | |
237 | break; | |
238 | case 2048: | |
239 | blocks_long >>= 1; | |
240 | break; | |
241 | case 512: | |
242 | blocks_long <<= 1; | |
243 | break; | |
244 | default: | |
245 | break; | |
246 | } | |
247 | break; | |
248 | case 512: | |
0fd97ccf | 249 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
250 | case 4096: |
251 | blocks_long >>= 3; | |
252 | break; | |
253 | case 2048: | |
254 | blocks_long >>= 2; | |
255 | break; | |
256 | case 1024: | |
257 | blocks_long >>= 1; | |
258 | break; | |
259 | default: | |
260 | break; | |
261 | } | |
262 | break; | |
263 | default: | |
264 | break; | |
265 | } | |
266 | ||
267 | return blocks_long; | |
268 | } | |
269 | ||
3a41d85f NB |
270 | static void iblock_complete_cmd(struct se_cmd *cmd) |
271 | { | |
272 | struct iblock_req *ibr = cmd->priv; | |
273 | u8 status; | |
274 | ||
5981c245 | 275 | if (!refcount_dec_and_test(&ibr->pending)) |
3a41d85f NB |
276 | return; |
277 | ||
278 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
279 | status = SAM_STAT_CHECK_CONDITION; | |
280 | else | |
281 | status = SAM_STAT_GOOD; | |
282 | ||
283 | target_complete_cmd(cmd, status); | |
284 | kfree(ibr); | |
285 | } | |
286 | ||
4246a0b6 | 287 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
288 | { |
289 | struct se_cmd *cmd = bio->bi_private; | |
290 | struct iblock_req *ibr = cmd->priv; | |
291 | ||
4e4cbee9 CH |
292 | if (bio->bi_status) { |
293 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); | |
3a41d85f NB |
294 | /* |
295 | * Bump the ib_bio_err_cnt and release bio. | |
296 | */ | |
297 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 298 | smp_mb__after_atomic(); |
3a41d85f NB |
299 | } |
300 | ||
301 | bio_put(bio); | |
302 | ||
303 | iblock_complete_cmd(cmd); | |
304 | } | |
305 | ||
306 | static struct bio * | |
e742fc32 MC |
307 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, int op, |
308 | int op_flags) | |
3a41d85f NB |
309 | { |
310 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
311 | struct bio *bio; | |
312 | ||
313 | /* | |
314 | * Only allocate as many vector entries as the bio code allows us to, | |
315 | * we'll loop later on until we have handled the whole request. | |
316 | */ | |
317 | if (sg_num > BIO_MAX_PAGES) | |
318 | sg_num = BIO_MAX_PAGES; | |
319 | ||
a47a28b7 | 320 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, &ib_dev->ibd_bio_set); |
3a41d85f NB |
321 | if (!bio) { |
322 | pr_err("Unable to allocate memory for bio\n"); | |
323 | return NULL; | |
324 | } | |
325 | ||
74d46992 | 326 | bio_set_dev(bio, ib_dev->ibd_bd); |
3a41d85f NB |
327 | bio->bi_private = cmd; |
328 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 329 | bio->bi_iter.bi_sector = lba; |
e742fc32 | 330 | bio_set_op_attrs(bio, op, op_flags); |
3a41d85f NB |
331 | |
332 | return bio; | |
333 | } | |
334 | ||
4e49ea4a | 335 | static void iblock_submit_bios(struct bio_list *list) |
3a41d85f NB |
336 | { |
337 | struct blk_plug plug; | |
338 | struct bio *bio; | |
339 | ||
340 | blk_start_plug(&plug); | |
341 | while ((bio = bio_list_pop(list))) | |
4e49ea4a | 342 | submit_bio(bio); |
3a41d85f NB |
343 | blk_finish_plug(&plug); |
344 | } | |
345 | ||
4246a0b6 | 346 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
347 | { |
348 | struct se_cmd *cmd = bio->bi_private; | |
349 | ||
4e4cbee9 CH |
350 | if (bio->bi_status) |
351 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); | |
df5fa691 | 352 | |
5787cacd | 353 | if (cmd) { |
4e4cbee9 | 354 | if (bio->bi_status) |
5787cacd | 355 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 356 | else |
5787cacd | 357 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
358 | } |
359 | ||
df5fa691 CH |
360 | bio_put(bio); |
361 | } | |
362 | ||
c66ac9db | 363 | /* |
df5fa691 CH |
364 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
365 | * always flush the whole cache. | |
c66ac9db | 366 | */ |
de103c93 CH |
367 | static sense_reason_t |
368 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 369 | { |
0fd97ccf | 370 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 371 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 372 | struct bio *bio; |
c66ac9db NB |
373 | |
374 | /* | |
375 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 376 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
377 | */ |
378 | if (immed) | |
5787cacd | 379 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 380 | |
df5fa691 CH |
381 | bio = bio_alloc(GFP_KERNEL, 0); |
382 | bio->bi_end_io = iblock_end_io_flush; | |
74d46992 | 383 | bio_set_dev(bio, ib_dev->ibd_bd); |
70fd7614 | 384 | bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
c66ac9db | 385 | if (!immed) |
df5fa691 | 386 | bio->bi_private = cmd; |
4e49ea4a | 387 | submit_bio(bio); |
ad67f0d9 | 388 | return 0; |
c66ac9db NB |
389 | } |
390 | ||
dbc21c5a | 391 | static sense_reason_t |
62e46942 | 392 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 393 | { |
62e46942 | 394 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 395 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
396 | int ret; |
397 | ||
8a9ebe71 MC |
398 | ret = blkdev_issue_discard(bdev, |
399 | target_to_linux_sector(dev, lba), | |
400 | target_to_linux_sector(dev, nolb), | |
401 | GFP_KERNEL, 0); | |
dbc21c5a AH |
402 | if (ret < 0) { |
403 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
404 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
07b63196 | 410 | static sense_reason_t |
2237498f | 411 | iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) |
07b63196 MC |
412 | { |
413 | struct se_device *dev = cmd->se_dev; | |
414 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
f5957dad BL |
415 | unsigned char *buf, *not_zero; |
416 | int ret; | |
07b63196 | 417 | |
2237498f NB |
418 | buf = kmap(sg_page(sg)) + sg->offset; |
419 | if (!buf) | |
420 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
421 | /* | |
422 | * Fall back to block_execute_write_same() slow-path if | |
423 | * incoming WRITE_SAME payload does not contain zeros. | |
424 | */ | |
f5957dad | 425 | not_zero = memchr_inv(buf, 0x00, cmd->data_length); |
2237498f | 426 | kunmap(sg_page(sg)); |
07b63196 | 427 | |
f5957dad | 428 | if (not_zero) |
2237498f | 429 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
07b63196 | 430 | |
2237498f | 431 | ret = blkdev_issue_zeroout(bdev, |
07b63196 MC |
432 | target_to_linux_sector(dev, cmd->t_task_lba), |
433 | target_to_linux_sector(dev, | |
434 | sbc_get_write_same_sectors(cmd)), | |
1d2ff149 | 435 | GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
07b63196 MC |
436 | if (ret) |
437 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
438 | ||
439 | target_complete_cmd(cmd, GOOD); | |
440 | return 0; | |
441 | } | |
442 | ||
f6970ad3 NB |
443 | static sense_reason_t |
444 | iblock_execute_write_same(struct se_cmd *cmd) | |
445 | { | |
07b63196 | 446 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
447 | struct iblock_req *ibr; |
448 | struct scatterlist *sg; | |
449 | struct bio *bio; | |
450 | struct bio_list list; | |
8a9ebe71 MC |
451 | struct se_device *dev = cmd->se_dev; |
452 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
453 | sector_t sectors = target_to_linux_sector(dev, | |
454 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 455 | |
afd73f1b NB |
456 | if (cmd->prot_op) { |
457 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
458 | " backends not supported\n"); | |
459 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
460 | } | |
f6970ad3 NB |
461 | sg = &cmd->t_data_sg[0]; |
462 | ||
463 | if (cmd->t_data_nents > 1 || | |
464 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
465 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
466 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
467 | cmd->se_dev->dev_attrib.block_size); | |
468 | return TCM_INVALID_CDB_FIELD; | |
469 | } | |
470 | ||
2237498f NB |
471 | if (bdev_write_zeroes_sectors(bdev)) { |
472 | if (!iblock_execute_zero_out(bdev, cmd)) | |
473 | return 0; | |
474 | } | |
07b63196 | 475 | |
f6970ad3 NB |
476 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
477 | if (!ibr) | |
478 | goto fail; | |
479 | cmd->priv = ibr; | |
480 | ||
e742fc32 | 481 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE, 0); |
f6970ad3 NB |
482 | if (!bio) |
483 | goto fail_free_ibr; | |
484 | ||
485 | bio_list_init(&list); | |
486 | bio_list_add(&list, bio); | |
487 | ||
5981c245 | 488 | refcount_set(&ibr->pending, 1); |
f6970ad3 NB |
489 | |
490 | while (sectors) { | |
491 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
492 | != sg->length) { | |
493 | ||
e742fc32 MC |
494 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE, |
495 | 0); | |
f6970ad3 NB |
496 | if (!bio) |
497 | goto fail_put_bios; | |
498 | ||
5981c245 | 499 | refcount_inc(&ibr->pending); |
f6970ad3 NB |
500 | bio_list_add(&list, bio); |
501 | } | |
502 | ||
503 | /* Always in 512 byte units for Linux/Block */ | |
80b045b3 | 504 | block_lba += sg->length >> SECTOR_SHIFT; |
5676234f | 505 | sectors -= sg->length >> SECTOR_SHIFT; |
f6970ad3 NB |
506 | } |
507 | ||
4e49ea4a | 508 | iblock_submit_bios(&list); |
f6970ad3 NB |
509 | return 0; |
510 | ||
511 | fail_put_bios: | |
512 | while ((bio = bio_list_pop(&list))) | |
513 | bio_put(bio); | |
514 | fail_free_ibr: | |
515 | kfree(ibr); | |
516 | fail: | |
517 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
518 | } | |
519 | ||
c66ac9db | 520 | enum { |
44bfd018 | 521 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
522 | }; |
523 | ||
524 | static match_table_t tokens = { | |
525 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 526 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
527 | {Opt_force, "force=%d"}, |
528 | {Opt_err, NULL} | |
529 | }; | |
530 | ||
0fd97ccf CH |
531 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
532 | const char *page, ssize_t count) | |
c66ac9db | 533 | { |
0fd97ccf | 534 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 535 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 536 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 537 | int ret = 0, token; |
44bfd018 | 538 | unsigned long tmp_readonly; |
c66ac9db NB |
539 | |
540 | opts = kstrdup(page, GFP_KERNEL); | |
541 | if (!opts) | |
542 | return -ENOMEM; | |
543 | ||
544 | orig = opts; | |
545 | ||
90c161b6 | 546 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
547 | if (!*ptr) |
548 | continue; | |
549 | ||
550 | token = match_token(ptr, tokens, args); | |
551 | switch (token) { | |
552 | case Opt_udev_path: | |
553 | if (ib_dev->ibd_bd) { | |
6708bb27 | 554 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
555 | " ib_dev->ibd_bd exists\n"); |
556 | ret = -EEXIST; | |
557 | goto out; | |
558 | } | |
852b6ed1 NB |
559 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
560 | SE_UDEV_PATH_LEN) == 0) { | |
561 | ret = -EINVAL; | |
6d180253 JJ |
562 | break; |
563 | } | |
6708bb27 | 564 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
565 | ib_dev->ibd_udev_path); |
566 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
567 | break; | |
44bfd018 AG |
568 | case Opt_readonly: |
569 | arg_p = match_strdup(&args[0]); | |
570 | if (!arg_p) { | |
571 | ret = -ENOMEM; | |
572 | break; | |
573 | } | |
57103d7f | 574 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
575 | kfree(arg_p); |
576 | if (ret < 0) { | |
57103d7f | 577 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
578 | " readonly=\n"); |
579 | goto out; | |
580 | } | |
581 | ib_dev->ibd_readonly = tmp_readonly; | |
582 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
583 | break; | |
c66ac9db | 584 | case Opt_force: |
c66ac9db NB |
585 | break; |
586 | default: | |
587 | break; | |
588 | } | |
589 | } | |
590 | ||
591 | out: | |
592 | kfree(orig); | |
593 | return (!ret) ? count : ret; | |
594 | } | |
595 | ||
0fd97ccf | 596 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 597 | { |
0fd97ccf CH |
598 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
599 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
600 | char buf[BDEVNAME_SIZE]; |
601 | ssize_t bl = 0; | |
602 | ||
603 | if (bd) | |
604 | bl += sprintf(b + bl, "iBlock device: %s", | |
605 | bdevname(bd, buf)); | |
0fd97ccf | 606 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 607 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
608 | ib_dev->ibd_udev_path); |
609 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
610 | |
611 | bl += sprintf(b + bl, " "); | |
612 | if (bd) { | |
613 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 614 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 615 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
616 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
617 | } else { | |
21bca31c | 618 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
619 | } |
620 | ||
621 | return bl; | |
622 | } | |
623 | ||
ecebbf6c | 624 | static int |
fed564f6 GE |
625 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, |
626 | struct sg_mapping_iter *miter) | |
ecebbf6c NB |
627 | { |
628 | struct se_device *dev = cmd->se_dev; | |
629 | struct blk_integrity *bi; | |
630 | struct bio_integrity_payload *bip; | |
631 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
fed564f6 GE |
632 | int rc; |
633 | size_t resid, len; | |
ecebbf6c NB |
634 | |
635 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
636 | if (!bi) { | |
637 | pr_err("Unable to locate bio_integrity\n"); | |
638 | return -ENODEV; | |
639 | } | |
640 | ||
fed564f6 GE |
641 | bip = bio_integrity_alloc(bio, GFP_NOIO, |
642 | min_t(unsigned int, cmd->t_prot_nents, BIO_MAX_PAGES)); | |
06c1e390 | 643 | if (IS_ERR(bip)) { |
ecebbf6c | 644 | pr_err("Unable to allocate bio_integrity_payload\n"); |
06c1e390 | 645 | return PTR_ERR(bip); |
ecebbf6c NB |
646 | } |
647 | ||
fed564f6 | 648 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); |
e4dc9a4c IR |
649 | /* virtual start sector must be in integrity interval units */ |
650 | bip_set_seed(bip, bio->bi_iter.bi_sector >> | |
651 | (bi->interval_exp - SECTOR_SHIFT)); | |
ecebbf6c | 652 | |
4e13c5d0 LT |
653 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
654 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c | 655 | |
fed564f6 GE |
656 | resid = bip->bip_iter.bi_size; |
657 | while (resid > 0 && sg_miter_next(miter)) { | |
ecebbf6c | 658 | |
fed564f6 GE |
659 | len = min_t(size_t, miter->length, resid); |
660 | rc = bio_integrity_add_page(bio, miter->page, len, | |
661 | offset_in_page(miter->addr)); | |
662 | if (rc != len) { | |
ecebbf6c | 663 | pr_err("bio_integrity_add_page() failed; %d\n", rc); |
fed564f6 | 664 | sg_miter_stop(miter); |
ecebbf6c NB |
665 | return -ENOMEM; |
666 | } | |
667 | ||
fed564f6 GE |
668 | pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", |
669 | miter->page, len, offset_in_page(miter->addr)); | |
670 | ||
671 | resid -= len; | |
672 | if (len < miter->length) | |
673 | miter->consumed -= miter->length - len; | |
ecebbf6c | 674 | } |
fed564f6 | 675 | sg_miter_stop(miter); |
ecebbf6c NB |
676 | |
677 | return 0; | |
678 | } | |
679 | ||
de103c93 | 680 | static sense_reason_t |
a82a9538 NB |
681 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
682 | enum dma_data_direction data_direction) | |
c66ac9db | 683 | { |
5951146d | 684 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 685 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
5787cacd | 686 | struct iblock_req *ibr; |
fed564f6 | 687 | struct bio *bio; |
dbbf3e94 | 688 | struct bio_list list; |
c66ac9db | 689 | struct scatterlist *sg; |
5787cacd | 690 | u32 sg_num = sgl_nents; |
d5b4a21b | 691 | unsigned bio_cnt; |
fed564f6 GE |
692 | int i, rc, op, op_flags = 0; |
693 | struct sg_mapping_iter prot_miter; | |
dbbf3e94 | 694 | |
5787cacd | 695 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
696 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
697 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 698 | /* |
70fd7614 | 699 | * Force writethrough using REQ_FUA if a volatile write cache |
d0c8b259 | 700 | * is not enabled, or if initiator set the Force Unit Access bit. |
dbbf3e94 | 701 | */ |
e742fc32 | 702 | op = REQ_OP_WRITE; |
c888a8f9 | 703 | if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
d0c8b259 | 704 | if (cmd->se_cmd_flags & SCF_FUA) |
70fd7614 | 705 | op_flags = REQ_FUA; |
c888a8f9 | 706 | else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
70fd7614 | 707 | op_flags = REQ_FUA; |
d0c8b259 | 708 | } |
dbbf3e94 | 709 | } else { |
e742fc32 | 710 | op = REQ_OP_READ; |
dbbf3e94 CH |
711 | } |
712 | ||
5787cacd CH |
713 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
714 | if (!ibr) | |
715 | goto fail; | |
716 | cmd->priv = ibr; | |
717 | ||
e0de4457 | 718 | if (!sgl_nents) { |
5981c245 | 719 | refcount_set(&ibr->pending, 1); |
e0de4457 PB |
720 | iblock_complete_cmd(cmd); |
721 | return 0; | |
722 | } | |
723 | ||
e742fc32 | 724 | bio = iblock_get_bio(cmd, block_lba, sgl_nents, op, op_flags); |
5787cacd CH |
725 | if (!bio) |
726 | goto fail_free_ibr; | |
dbbf3e94 CH |
727 | |
728 | bio_list_init(&list); | |
729 | bio_list_add(&list, bio); | |
5787cacd | 730 | |
5981c245 | 731 | refcount_set(&ibr->pending, 2); |
d5b4a21b | 732 | bio_cnt = 1; |
c66ac9db | 733 | |
fed564f6 GE |
734 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) |
735 | sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, | |
736 | op == REQ_OP_READ ? SG_MITER_FROM_SG : | |
737 | SG_MITER_TO_SG); | |
738 | ||
5787cacd | 739 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
740 | /* |
741 | * XXX: if the length the device accepts is shorter than the | |
742 | * length of the S/G list entry this will cause and | |
743 | * endless loop. Better hope no driver uses huge pages. | |
744 | */ | |
745 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
746 | != sg->length) { | |
fed564f6 GE |
747 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
748 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); | |
749 | if (rc) | |
750 | goto fail_put_bios; | |
751 | } | |
752 | ||
d5b4a21b | 753 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
4e49ea4a | 754 | iblock_submit_bios(&list); |
d5b4a21b CH |
755 | bio_cnt = 0; |
756 | } | |
757 | ||
e742fc32 MC |
758 | bio = iblock_get_bio(cmd, block_lba, sg_num, op, |
759 | op_flags); | |
6708bb27 | 760 | if (!bio) |
5787cacd CH |
761 | goto fail_put_bios; |
762 | ||
5981c245 | 763 | refcount_inc(&ibr->pending); |
dbbf3e94 | 764 | bio_list_add(&list, bio); |
d5b4a21b | 765 | bio_cnt++; |
c66ac9db | 766 | } |
dbbf3e94 | 767 | |
c66ac9db | 768 | /* Always in 512 byte units for Linux/Block */ |
80b045b3 | 769 | block_lba += sg->length >> SECTOR_SHIFT; |
c66ac9db | 770 | sg_num--; |
c66ac9db NB |
771 | } |
772 | ||
6f16ec43 | 773 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
fed564f6 | 774 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); |
ecebbf6c NB |
775 | if (rc) |
776 | goto fail_put_bios; | |
777 | } | |
778 | ||
4e49ea4a | 779 | iblock_submit_bios(&list); |
5787cacd | 780 | iblock_complete_cmd(cmd); |
03e98c9e | 781 | return 0; |
dbbf3e94 | 782 | |
5787cacd | 783 | fail_put_bios: |
dbbf3e94 | 784 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 785 | bio_put(bio); |
5787cacd CH |
786 | fail_free_ibr: |
787 | kfree(ibr); | |
5787cacd | 788 | fail: |
de103c93 | 789 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
790 | } |
791 | ||
c66ac9db NB |
792 | static sector_t iblock_get_blocks(struct se_device *dev) |
793 | { | |
0fd97ccf CH |
794 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
795 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
796 | struct request_queue *q = bdev_get_queue(bd); |
797 | ||
798 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
799 | } | |
800 | ||
7f7caf6a AG |
801 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
802 | { | |
803 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
804 | struct block_device *bd = ib_dev->ibd_bd; | |
805 | int ret; | |
806 | ||
807 | ret = bdev_alignment_offset(bd); | |
808 | if (ret == -1) | |
809 | return 0; | |
810 | ||
811 | /* convert offset-bytes to offset-lbas */ | |
812 | return ret / bdev_logical_block_size(bd); | |
813 | } | |
814 | ||
815 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
816 | { | |
817 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
818 | struct block_device *bd = ib_dev->ibd_bd; | |
819 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); | |
820 | ||
821 | return ilog2(logs_per_phys); | |
822 | } | |
823 | ||
824 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
825 | { | |
826 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
827 | struct block_device *bd = ib_dev->ibd_bd; | |
828 | ||
829 | return bdev_io_min(bd); | |
830 | } | |
831 | ||
832 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
833 | { | |
834 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
835 | struct block_device *bd = ib_dev->ibd_bd; | |
836 | ||
837 | return bdev_io_opt(bd); | |
838 | } | |
839 | ||
9e999a6c | 840 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 841 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 842 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 843 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 844 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
845 | }; |
846 | ||
de103c93 CH |
847 | static sense_reason_t |
848 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 849 | { |
9e999a6c | 850 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
851 | } |
852 | ||
452e2010 | 853 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
854 | { |
855 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
856 | struct block_device *bd = ib_dev->ibd_bd; | |
857 | struct request_queue *q = bdev_get_queue(bd); | |
858 | ||
c888a8f9 | 859 | return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
d0c8b259 NB |
860 | } |
861 | ||
0a06d430 | 862 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 863 | .name = "iblock", |
0fd97ccf CH |
864 | .inquiry_prod = "IBLOCK", |
865 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 866 | .owner = THIS_MODULE, |
c66ac9db NB |
867 | .attach_hba = iblock_attach_hba, |
868 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
869 | .alloc_device = iblock_alloc_device, |
870 | .configure_device = iblock_configure_device, | |
92634706 | 871 | .destroy_device = iblock_destroy_device, |
c66ac9db | 872 | .free_device = iblock_free_device, |
0c2ad7d1 | 873 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
874 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
875 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 876 | .get_device_type = sbc_get_device_type, |
c66ac9db | 877 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
878 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
879 | .get_lbppbe = iblock_get_lbppbe, | |
880 | .get_io_min = iblock_get_io_min, | |
881 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 882 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 883 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
884 | }; |
885 | ||
886 | static int __init iblock_module_init(void) | |
887 | { | |
0a06d430 | 888 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
889 | } |
890 | ||
63b91d5a | 891 | static void __exit iblock_module_exit(void) |
c66ac9db | 892 | { |
0a06d430 | 893 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
894 | } |
895 | ||
896 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
897 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
898 | MODULE_LICENSE("GPL"); | |
899 | ||
900 | module_init(iblock_module_init); | |
901 | module_exit(iblock_module_exit); |