Commit | Line | Data |
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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 | |
415ccd98 MC |
64 | ib_dev->ibd_plug = kcalloc(nr_cpu_ids, sizeof(*ib_dev->ibd_plug), |
65 | GFP_KERNEL); | |
66 | if (!ib_dev->ibd_plug) | |
67 | goto free_dev; | |
68 | ||
6708bb27 | 69 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 70 | |
0fd97ccf | 71 | return &ib_dev->dev; |
415ccd98 MC |
72 | |
73 | free_dev: | |
74 | kfree(ib_dev); | |
75 | return NULL; | |
c66ac9db NB |
76 | } |
77 | ||
0fd97ccf | 78 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 79 | { |
0fd97ccf | 80 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 81 | struct request_queue *q; |
0fd97ccf | 82 | struct block_device *bd = NULL; |
ecebbf6c | 83 | struct blk_integrity *bi; |
44bfd018 | 84 | fmode_t mode; |
2237498f | 85 | unsigned int max_write_zeroes_sectors; |
0fd97ccf | 86 | int ret = -ENOMEM; |
c66ac9db | 87 | |
0fd97ccf CH |
88 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
89 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
90 | return -EINVAL; | |
c66ac9db | 91 | } |
d5b4a21b | 92 | |
a47a28b7 KO |
93 | ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
94 | if (ret) { | |
0fd97ccf CH |
95 | pr_err("IBLOCK: Unable to create bioset\n"); |
96 | goto out; | |
c66ac9db | 97 | } |
0fd97ccf | 98 | |
6708bb27 | 99 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
100 | ib_dev->ibd_udev_path); |
101 | ||
44bfd018 AG |
102 | mode = FMODE_READ|FMODE_EXCL; |
103 | if (!ib_dev->ibd_readonly) | |
104 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
105 | else |
106 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
107 | |
108 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
109 | if (IS_ERR(bd)) { |
110 | ret = PTR_ERR(bd); | |
0fd97ccf | 111 | goto out_free_bioset; |
613640e4 | 112 | } |
c66ac9db NB |
113 | ib_dev->ibd_bd = bd; |
114 | ||
0fd97ccf CH |
115 | q = bdev_get_queue(bd); |
116 | ||
117 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
046ba642 | 118 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
0fd97ccf | 119 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 120 | |
ea263c7f | 121 | if (target_configure_unmap_from_queue(&dev->dev_attrib, q)) |
6708bb27 | 122 | pr_debug("IBLOCK: BLOCK Discard support available," |
8a9ebe71 MC |
123 | " disabled by default\n"); |
124 | ||
f6970ad3 NB |
125 | /* |
126 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
127 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
128 | */ | |
2237498f NB |
129 | max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); |
130 | if (max_write_zeroes_sectors) | |
131 | dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; | |
132 | else | |
133 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 134 | |
e22a7f07 | 135 | if (blk_queue_nonrot(q)) |
0fd97ccf | 136 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 137 | |
ecebbf6c NB |
138 | bi = bdev_get_integrity(bd); |
139 | if (bi) { | |
a47a28b7 | 140 | struct bio_set *bs = &ib_dev->ibd_bio_set; |
ecebbf6c | 141 | |
0f8087ec MP |
142 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
143 | !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { | |
ecebbf6c | 144 | pr_err("IBLOCK export of blk_integrity: %s not" |
0f8087ec | 145 | " supported\n", bi->profile->name); |
ecebbf6c NB |
146 | ret = -ENOSYS; |
147 | goto out_blkdev_put; | |
148 | } | |
149 | ||
0f8087ec | 150 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
ecebbf6c | 151 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
0f8087ec | 152 | } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
ecebbf6c NB |
153 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
154 | } | |
155 | ||
156 | if (dev->dev_attrib.pi_prot_type) { | |
157 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
158 | pr_err("Unable to allocate bioset for PI\n"); | |
159 | ret = -ENOMEM; | |
160 | goto out_blkdev_put; | |
161 | } | |
162 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
f4f8154a | 163 | &bs->bio_integrity_pool); |
ecebbf6c NB |
164 | } |
165 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
166 | } | |
167 | ||
0fd97ccf | 168 | return 0; |
c66ac9db | 169 | |
ecebbf6c NB |
170 | out_blkdev_put: |
171 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf | 172 | out_free_bioset: |
a47a28b7 | 173 | bioset_exit(&ib_dev->ibd_bio_set); |
0fd97ccf CH |
174 | out: |
175 | return ret; | |
c66ac9db NB |
176 | } |
177 | ||
4cc987ea NB |
178 | static void iblock_dev_call_rcu(struct rcu_head *p) |
179 | { | |
180 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
181 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
182 | ||
415ccd98 | 183 | kfree(ib_dev->ibd_plug); |
4cc987ea NB |
184 | kfree(ib_dev); |
185 | } | |
186 | ||
0fd97ccf | 187 | static void iblock_free_device(struct se_device *dev) |
92634706 MC |
188 | { |
189 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); | |
190 | } | |
191 | ||
192 | static void iblock_destroy_device(struct se_device *dev) | |
c66ac9db | 193 | { |
0fd97ccf | 194 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 195 | |
bc665524 NB |
196 | if (ib_dev->ibd_bd != NULL) |
197 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
a47a28b7 | 198 | bioset_exit(&ib_dev->ibd_bio_set); |
c66ac9db NB |
199 | } |
200 | ||
415ccd98 MC |
201 | static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) |
202 | { | |
203 | struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); | |
204 | struct iblock_dev_plug *ib_dev_plug; | |
205 | ||
206 | /* | |
207 | * Each se_device has a per cpu work this can be run from. Wwe | |
208 | * shouldn't have multiple threads on the same cpu calling this | |
209 | * at the same time. | |
210 | */ | |
211 | ib_dev_plug = &ib_dev->ibd_plug[smp_processor_id()]; | |
212 | if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) | |
213 | return NULL; | |
214 | ||
215 | blk_start_plug(&ib_dev_plug->blk_plug); | |
216 | return &ib_dev_plug->se_plug; | |
217 | } | |
218 | ||
219 | static void iblock_unplug_device(struct se_dev_plug *se_plug) | |
220 | { | |
221 | struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, | |
222 | struct iblock_dev_plug, se_plug); | |
223 | ||
224 | blk_finish_plug(&ib_dev_plug->blk_plug); | |
225 | clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); | |
226 | } | |
227 | ||
c66ac9db NB |
228 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
229 | struct se_device *dev, | |
230 | struct block_device *bd, | |
231 | struct request_queue *q) | |
232 | { | |
233 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
234 | bdev_logical_block_size(bd)) - 1); | |
235 | u32 block_size = bdev_logical_block_size(bd); | |
236 | ||
0fd97ccf | 237 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
238 | return blocks_long; |
239 | ||
240 | switch (block_size) { | |
241 | case 4096: | |
0fd97ccf | 242 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
243 | case 2048: |
244 | blocks_long <<= 1; | |
245 | break; | |
246 | case 1024: | |
247 | blocks_long <<= 2; | |
248 | break; | |
249 | case 512: | |
250 | blocks_long <<= 3; | |
492096ec | 251 | break; |
c66ac9db NB |
252 | default: |
253 | break; | |
254 | } | |
255 | break; | |
256 | case 2048: | |
0fd97ccf | 257 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
258 | case 4096: |
259 | blocks_long >>= 1; | |
260 | break; | |
261 | case 1024: | |
262 | blocks_long <<= 1; | |
263 | break; | |
264 | case 512: | |
265 | blocks_long <<= 2; | |
266 | break; | |
267 | default: | |
268 | break; | |
269 | } | |
270 | break; | |
271 | case 1024: | |
0fd97ccf | 272 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
273 | case 4096: |
274 | blocks_long >>= 2; | |
275 | break; | |
276 | case 2048: | |
277 | blocks_long >>= 1; | |
278 | break; | |
279 | case 512: | |
280 | blocks_long <<= 1; | |
281 | break; | |
282 | default: | |
283 | break; | |
284 | } | |
285 | break; | |
286 | case 512: | |
0fd97ccf | 287 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
288 | case 4096: |
289 | blocks_long >>= 3; | |
290 | break; | |
291 | case 2048: | |
292 | blocks_long >>= 2; | |
293 | break; | |
294 | case 1024: | |
295 | blocks_long >>= 1; | |
296 | break; | |
297 | default: | |
298 | break; | |
299 | } | |
300 | break; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | ||
305 | return blocks_long; | |
306 | } | |
307 | ||
3a41d85f NB |
308 | static void iblock_complete_cmd(struct se_cmd *cmd) |
309 | { | |
310 | struct iblock_req *ibr = cmd->priv; | |
311 | u8 status; | |
312 | ||
5981c245 | 313 | if (!refcount_dec_and_test(&ibr->pending)) |
3a41d85f NB |
314 | return; |
315 | ||
316 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
317 | status = SAM_STAT_CHECK_CONDITION; | |
318 | else | |
319 | status = SAM_STAT_GOOD; | |
320 | ||
321 | target_complete_cmd(cmd, status); | |
322 | kfree(ibr); | |
323 | } | |
324 | ||
4246a0b6 | 325 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
326 | { |
327 | struct se_cmd *cmd = bio->bi_private; | |
328 | struct iblock_req *ibr = cmd->priv; | |
329 | ||
4e4cbee9 CH |
330 | if (bio->bi_status) { |
331 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); | |
3a41d85f NB |
332 | /* |
333 | * Bump the ib_bio_err_cnt and release bio. | |
334 | */ | |
335 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 336 | smp_mb__after_atomic(); |
3a41d85f NB |
337 | } |
338 | ||
339 | bio_put(bio); | |
340 | ||
341 | iblock_complete_cmd(cmd); | |
342 | } | |
343 | ||
bc9e0e36 CK |
344 | static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, |
345 | unsigned int opf) | |
3a41d85f NB |
346 | { |
347 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
348 | struct bio *bio; | |
349 | ||
350 | /* | |
351 | * Only allocate as many vector entries as the bio code allows us to, | |
352 | * we'll loop later on until we have handled the whole request. | |
353 | */ | |
5f7136db MWO |
354 | bio = bio_alloc_bioset(GFP_NOIO, bio_max_segs(sg_num), |
355 | &ib_dev->ibd_bio_set); | |
3a41d85f NB |
356 | if (!bio) { |
357 | pr_err("Unable to allocate memory for bio\n"); | |
358 | return NULL; | |
359 | } | |
360 | ||
74d46992 | 361 | bio_set_dev(bio, ib_dev->ibd_bd); |
3a41d85f NB |
362 | bio->bi_private = cmd; |
363 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 364 | bio->bi_iter.bi_sector = lba; |
bc9e0e36 | 365 | bio->bi_opf = opf; |
3a41d85f NB |
366 | |
367 | return bio; | |
368 | } | |
369 | ||
4e49ea4a | 370 | static void iblock_submit_bios(struct bio_list *list) |
3a41d85f NB |
371 | { |
372 | struct blk_plug plug; | |
373 | struct bio *bio; | |
415ccd98 MC |
374 | /* |
375 | * The block layer handles nested plugs, so just plug/unplug to handle | |
376 | * fabric drivers that didn't support batching and multi bio cmds. | |
377 | */ | |
3a41d85f NB |
378 | blk_start_plug(&plug); |
379 | while ((bio = bio_list_pop(list))) | |
4e49ea4a | 380 | submit_bio(bio); |
3a41d85f NB |
381 | blk_finish_plug(&plug); |
382 | } | |
383 | ||
4246a0b6 | 384 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
385 | { |
386 | struct se_cmd *cmd = bio->bi_private; | |
387 | ||
4e4cbee9 CH |
388 | if (bio->bi_status) |
389 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); | |
df5fa691 | 390 | |
5787cacd | 391 | if (cmd) { |
4e4cbee9 | 392 | if (bio->bi_status) |
5787cacd | 393 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 394 | else |
5787cacd | 395 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
396 | } |
397 | ||
df5fa691 CH |
398 | bio_put(bio); |
399 | } | |
400 | ||
c66ac9db | 401 | /* |
df5fa691 CH |
402 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
403 | * always flush the whole cache. | |
c66ac9db | 404 | */ |
de103c93 CH |
405 | static sense_reason_t |
406 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 407 | { |
0fd97ccf | 408 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 409 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 410 | struct bio *bio; |
c66ac9db NB |
411 | |
412 | /* | |
413 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 414 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
415 | */ |
416 | if (immed) | |
5787cacd | 417 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 418 | |
df5fa691 CH |
419 | bio = bio_alloc(GFP_KERNEL, 0); |
420 | bio->bi_end_io = iblock_end_io_flush; | |
74d46992 | 421 | bio_set_dev(bio, ib_dev->ibd_bd); |
70fd7614 | 422 | bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; |
c66ac9db | 423 | if (!immed) |
df5fa691 | 424 | bio->bi_private = cmd; |
4e49ea4a | 425 | submit_bio(bio); |
ad67f0d9 | 426 | return 0; |
c66ac9db NB |
427 | } |
428 | ||
dbc21c5a | 429 | static sense_reason_t |
62e46942 | 430 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 431 | { |
62e46942 | 432 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 433 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
434 | int ret; |
435 | ||
8a9ebe71 MC |
436 | ret = blkdev_issue_discard(bdev, |
437 | target_to_linux_sector(dev, lba), | |
438 | target_to_linux_sector(dev, nolb), | |
439 | GFP_KERNEL, 0); | |
dbc21c5a AH |
440 | if (ret < 0) { |
441 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
442 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
443 | } | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
07b63196 | 448 | static sense_reason_t |
2237498f | 449 | iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) |
07b63196 MC |
450 | { |
451 | struct se_device *dev = cmd->se_dev; | |
452 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
f5957dad BL |
453 | unsigned char *buf, *not_zero; |
454 | int ret; | |
07b63196 | 455 | |
2237498f NB |
456 | buf = kmap(sg_page(sg)) + sg->offset; |
457 | if (!buf) | |
458 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
459 | /* | |
460 | * Fall back to block_execute_write_same() slow-path if | |
461 | * incoming WRITE_SAME payload does not contain zeros. | |
462 | */ | |
f5957dad | 463 | not_zero = memchr_inv(buf, 0x00, cmd->data_length); |
2237498f | 464 | kunmap(sg_page(sg)); |
07b63196 | 465 | |
f5957dad | 466 | if (not_zero) |
2237498f | 467 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
07b63196 | 468 | |
2237498f | 469 | ret = blkdev_issue_zeroout(bdev, |
07b63196 MC |
470 | target_to_linux_sector(dev, cmd->t_task_lba), |
471 | target_to_linux_sector(dev, | |
472 | sbc_get_write_same_sectors(cmd)), | |
1d2ff149 | 473 | GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
07b63196 MC |
474 | if (ret) |
475 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
476 | ||
477 | target_complete_cmd(cmd, GOOD); | |
478 | return 0; | |
479 | } | |
480 | ||
f6970ad3 NB |
481 | static sense_reason_t |
482 | iblock_execute_write_same(struct se_cmd *cmd) | |
483 | { | |
07b63196 | 484 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
485 | struct iblock_req *ibr; |
486 | struct scatterlist *sg; | |
487 | struct bio *bio; | |
488 | struct bio_list list; | |
8a9ebe71 MC |
489 | struct se_device *dev = cmd->se_dev; |
490 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
491 | sector_t sectors = target_to_linux_sector(dev, | |
492 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 493 | |
afd73f1b NB |
494 | if (cmd->prot_op) { |
495 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
496 | " backends not supported\n"); | |
497 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
498 | } | |
f6970ad3 NB |
499 | sg = &cmd->t_data_sg[0]; |
500 | ||
501 | if (cmd->t_data_nents > 1 || | |
502 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
503 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
504 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
505 | cmd->se_dev->dev_attrib.block_size); | |
506 | return TCM_INVALID_CDB_FIELD; | |
507 | } | |
508 | ||
2237498f NB |
509 | if (bdev_write_zeroes_sectors(bdev)) { |
510 | if (!iblock_execute_zero_out(bdev, cmd)) | |
511 | return 0; | |
512 | } | |
07b63196 | 513 | |
f6970ad3 NB |
514 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
515 | if (!ibr) | |
516 | goto fail; | |
517 | cmd->priv = ibr; | |
518 | ||
bc9e0e36 | 519 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); |
f6970ad3 NB |
520 | if (!bio) |
521 | goto fail_free_ibr; | |
522 | ||
523 | bio_list_init(&list); | |
524 | bio_list_add(&list, bio); | |
525 | ||
5981c245 | 526 | refcount_set(&ibr->pending, 1); |
f6970ad3 NB |
527 | |
528 | while (sectors) { | |
529 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
530 | != sg->length) { | |
531 | ||
bc9e0e36 | 532 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); |
f6970ad3 NB |
533 | if (!bio) |
534 | goto fail_put_bios; | |
535 | ||
5981c245 | 536 | refcount_inc(&ibr->pending); |
f6970ad3 NB |
537 | bio_list_add(&list, bio); |
538 | } | |
539 | ||
540 | /* Always in 512 byte units for Linux/Block */ | |
80b045b3 | 541 | block_lba += sg->length >> SECTOR_SHIFT; |
5676234f | 542 | sectors -= sg->length >> SECTOR_SHIFT; |
f6970ad3 NB |
543 | } |
544 | ||
4e49ea4a | 545 | iblock_submit_bios(&list); |
f6970ad3 NB |
546 | return 0; |
547 | ||
548 | fail_put_bios: | |
549 | while ((bio = bio_list_pop(&list))) | |
550 | bio_put(bio); | |
551 | fail_free_ibr: | |
552 | kfree(ibr); | |
553 | fail: | |
554 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
555 | } | |
556 | ||
c66ac9db | 557 | enum { |
44bfd018 | 558 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
559 | }; |
560 | ||
561 | static match_table_t tokens = { | |
562 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 563 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
564 | {Opt_force, "force=%d"}, |
565 | {Opt_err, NULL} | |
566 | }; | |
567 | ||
0fd97ccf CH |
568 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
569 | const char *page, ssize_t count) | |
c66ac9db | 570 | { |
0fd97ccf | 571 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 572 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 573 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 574 | int ret = 0, token; |
44bfd018 | 575 | unsigned long tmp_readonly; |
c66ac9db NB |
576 | |
577 | opts = kstrdup(page, GFP_KERNEL); | |
578 | if (!opts) | |
579 | return -ENOMEM; | |
580 | ||
581 | orig = opts; | |
582 | ||
90c161b6 | 583 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
584 | if (!*ptr) |
585 | continue; | |
586 | ||
587 | token = match_token(ptr, tokens, args); | |
588 | switch (token) { | |
589 | case Opt_udev_path: | |
590 | if (ib_dev->ibd_bd) { | |
6708bb27 | 591 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
592 | " ib_dev->ibd_bd exists\n"); |
593 | ret = -EEXIST; | |
594 | goto out; | |
595 | } | |
852b6ed1 NB |
596 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
597 | SE_UDEV_PATH_LEN) == 0) { | |
598 | ret = -EINVAL; | |
6d180253 JJ |
599 | break; |
600 | } | |
6708bb27 | 601 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
602 | ib_dev->ibd_udev_path); |
603 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
604 | break; | |
44bfd018 AG |
605 | case Opt_readonly: |
606 | arg_p = match_strdup(&args[0]); | |
607 | if (!arg_p) { | |
608 | ret = -ENOMEM; | |
609 | break; | |
610 | } | |
57103d7f | 611 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
612 | kfree(arg_p); |
613 | if (ret < 0) { | |
57103d7f | 614 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
615 | " readonly=\n"); |
616 | goto out; | |
617 | } | |
618 | ib_dev->ibd_readonly = tmp_readonly; | |
619 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
620 | break; | |
c66ac9db | 621 | case Opt_force: |
c66ac9db NB |
622 | break; |
623 | default: | |
624 | break; | |
625 | } | |
626 | } | |
627 | ||
628 | out: | |
629 | kfree(orig); | |
630 | return (!ret) ? count : ret; | |
631 | } | |
632 | ||
0fd97ccf | 633 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 634 | { |
0fd97ccf CH |
635 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
636 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
637 | char buf[BDEVNAME_SIZE]; |
638 | ssize_t bl = 0; | |
639 | ||
640 | if (bd) | |
641 | bl += sprintf(b + bl, "iBlock device: %s", | |
642 | bdevname(bd, buf)); | |
0fd97ccf | 643 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 644 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
645 | ib_dev->ibd_udev_path); |
646 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
647 | |
648 | bl += sprintf(b + bl, " "); | |
649 | if (bd) { | |
650 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
57ba1059 CH |
651 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), |
652 | "CLAIMED: IBLOCK"); | |
c66ac9db | 653 | } else { |
21bca31c | 654 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
655 | } |
656 | ||
657 | return bl; | |
658 | } | |
659 | ||
ecebbf6c | 660 | static int |
fed564f6 GE |
661 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, |
662 | struct sg_mapping_iter *miter) | |
ecebbf6c NB |
663 | { |
664 | struct se_device *dev = cmd->se_dev; | |
665 | struct blk_integrity *bi; | |
666 | struct bio_integrity_payload *bip; | |
667 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
fed564f6 GE |
668 | int rc; |
669 | size_t resid, len; | |
ecebbf6c NB |
670 | |
671 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
672 | if (!bi) { | |
673 | pr_err("Unable to locate bio_integrity\n"); | |
674 | return -ENODEV; | |
675 | } | |
676 | ||
5f7136db | 677 | bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); |
06c1e390 | 678 | if (IS_ERR(bip)) { |
ecebbf6c | 679 | pr_err("Unable to allocate bio_integrity_payload\n"); |
06c1e390 | 680 | return PTR_ERR(bip); |
ecebbf6c NB |
681 | } |
682 | ||
fed564f6 | 683 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); |
e4dc9a4c IR |
684 | /* virtual start sector must be in integrity interval units */ |
685 | bip_set_seed(bip, bio->bi_iter.bi_sector >> | |
686 | (bi->interval_exp - SECTOR_SHIFT)); | |
ecebbf6c | 687 | |
4e13c5d0 LT |
688 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
689 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c | 690 | |
fed564f6 GE |
691 | resid = bip->bip_iter.bi_size; |
692 | while (resid > 0 && sg_miter_next(miter)) { | |
ecebbf6c | 693 | |
fed564f6 GE |
694 | len = min_t(size_t, miter->length, resid); |
695 | rc = bio_integrity_add_page(bio, miter->page, len, | |
696 | offset_in_page(miter->addr)); | |
697 | if (rc != len) { | |
ecebbf6c | 698 | pr_err("bio_integrity_add_page() failed; %d\n", rc); |
fed564f6 | 699 | sg_miter_stop(miter); |
ecebbf6c NB |
700 | return -ENOMEM; |
701 | } | |
702 | ||
fed564f6 GE |
703 | pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", |
704 | miter->page, len, offset_in_page(miter->addr)); | |
705 | ||
706 | resid -= len; | |
707 | if (len < miter->length) | |
708 | miter->consumed -= miter->length - len; | |
ecebbf6c | 709 | } |
fed564f6 | 710 | sg_miter_stop(miter); |
ecebbf6c NB |
711 | |
712 | return 0; | |
713 | } | |
714 | ||
de103c93 | 715 | static sense_reason_t |
a82a9538 NB |
716 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
717 | enum dma_data_direction data_direction) | |
c66ac9db | 718 | { |
5951146d | 719 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 720 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
5787cacd | 721 | struct iblock_req *ibr; |
fed564f6 | 722 | struct bio *bio; |
dbbf3e94 | 723 | struct bio_list list; |
c66ac9db | 724 | struct scatterlist *sg; |
5787cacd | 725 | u32 sg_num = sgl_nents; |
bc9e0e36 | 726 | unsigned int opf; |
d5b4a21b | 727 | unsigned bio_cnt; |
bc9e0e36 | 728 | int i, rc; |
fed564f6 | 729 | struct sg_mapping_iter prot_miter; |
bc9e0e36 | 730 | unsigned int miter_dir; |
dbbf3e94 | 731 | |
5787cacd | 732 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
733 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
734 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 735 | /* |
70fd7614 | 736 | * Force writethrough using REQ_FUA if a volatile write cache |
d0c8b259 | 737 | * is not enabled, or if initiator set the Force Unit Access bit. |
dbbf3e94 | 738 | */ |
bc9e0e36 CK |
739 | opf = REQ_OP_WRITE; |
740 | miter_dir = SG_MITER_TO_SG; | |
c888a8f9 | 741 | if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
d0c8b259 | 742 | if (cmd->se_cmd_flags & SCF_FUA) |
bc9e0e36 | 743 | opf |= REQ_FUA; |
c888a8f9 | 744 | else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
bc9e0e36 | 745 | opf |= REQ_FUA; |
d0c8b259 | 746 | } |
dbbf3e94 | 747 | } else { |
bc9e0e36 CK |
748 | opf = REQ_OP_READ; |
749 | miter_dir = SG_MITER_FROM_SG; | |
dbbf3e94 CH |
750 | } |
751 | ||
5787cacd CH |
752 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
753 | if (!ibr) | |
754 | goto fail; | |
755 | cmd->priv = ibr; | |
756 | ||
e0de4457 | 757 | if (!sgl_nents) { |
5981c245 | 758 | refcount_set(&ibr->pending, 1); |
e0de4457 PB |
759 | iblock_complete_cmd(cmd); |
760 | return 0; | |
761 | } | |
762 | ||
bc9e0e36 | 763 | bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); |
5787cacd CH |
764 | if (!bio) |
765 | goto fail_free_ibr; | |
dbbf3e94 CH |
766 | |
767 | bio_list_init(&list); | |
768 | bio_list_add(&list, bio); | |
5787cacd | 769 | |
5981c245 | 770 | refcount_set(&ibr->pending, 2); |
d5b4a21b | 771 | bio_cnt = 1; |
c66ac9db | 772 | |
fed564f6 GE |
773 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) |
774 | sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, | |
bc9e0e36 | 775 | miter_dir); |
fed564f6 | 776 | |
5787cacd | 777 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
778 | /* |
779 | * XXX: if the length the device accepts is shorter than the | |
780 | * length of the S/G list entry this will cause and | |
781 | * endless loop. Better hope no driver uses huge pages. | |
782 | */ | |
783 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
784 | != sg->length) { | |
fed564f6 GE |
785 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
786 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); | |
787 | if (rc) | |
788 | goto fail_put_bios; | |
789 | } | |
790 | ||
d5b4a21b | 791 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
4e49ea4a | 792 | iblock_submit_bios(&list); |
d5b4a21b CH |
793 | bio_cnt = 0; |
794 | } | |
795 | ||
bc9e0e36 | 796 | bio = iblock_get_bio(cmd, block_lba, sg_num, opf); |
6708bb27 | 797 | if (!bio) |
5787cacd CH |
798 | goto fail_put_bios; |
799 | ||
5981c245 | 800 | refcount_inc(&ibr->pending); |
dbbf3e94 | 801 | bio_list_add(&list, bio); |
d5b4a21b | 802 | bio_cnt++; |
c66ac9db | 803 | } |
dbbf3e94 | 804 | |
c66ac9db | 805 | /* Always in 512 byte units for Linux/Block */ |
80b045b3 | 806 | block_lba += sg->length >> SECTOR_SHIFT; |
c66ac9db | 807 | sg_num--; |
c66ac9db NB |
808 | } |
809 | ||
6f16ec43 | 810 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
fed564f6 | 811 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); |
ecebbf6c NB |
812 | if (rc) |
813 | goto fail_put_bios; | |
814 | } | |
815 | ||
4e49ea4a | 816 | iblock_submit_bios(&list); |
5787cacd | 817 | iblock_complete_cmd(cmd); |
03e98c9e | 818 | return 0; |
dbbf3e94 | 819 | |
5787cacd | 820 | fail_put_bios: |
dbbf3e94 | 821 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 822 | bio_put(bio); |
5787cacd CH |
823 | fail_free_ibr: |
824 | kfree(ibr); | |
5787cacd | 825 | fail: |
de103c93 | 826 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
827 | } |
828 | ||
c66ac9db NB |
829 | static sector_t iblock_get_blocks(struct se_device *dev) |
830 | { | |
0fd97ccf CH |
831 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
832 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
833 | struct request_queue *q = bdev_get_queue(bd); |
834 | ||
835 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
836 | } | |
837 | ||
7f7caf6a AG |
838 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
839 | { | |
840 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
841 | struct block_device *bd = ib_dev->ibd_bd; | |
842 | int ret; | |
843 | ||
844 | ret = bdev_alignment_offset(bd); | |
845 | if (ret == -1) | |
846 | return 0; | |
847 | ||
848 | /* convert offset-bytes to offset-lbas */ | |
849 | return ret / bdev_logical_block_size(bd); | |
850 | } | |
851 | ||
852 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
853 | { | |
854 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
855 | struct block_device *bd = ib_dev->ibd_bd; | |
c151eddb | 856 | unsigned int logs_per_phys = |
a2c6c6a3 | 857 | bdev_physical_block_size(bd) / bdev_logical_block_size(bd); |
7f7caf6a AG |
858 | |
859 | return ilog2(logs_per_phys); | |
860 | } | |
861 | ||
862 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
863 | { | |
864 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
865 | struct block_device *bd = ib_dev->ibd_bd; | |
866 | ||
867 | return bdev_io_min(bd); | |
868 | } | |
869 | ||
870 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
871 | { | |
872 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
873 | struct block_device *bd = ib_dev->ibd_bd; | |
874 | ||
875 | return bdev_io_opt(bd); | |
876 | } | |
877 | ||
9e999a6c | 878 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 879 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 880 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 881 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 882 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
883 | }; |
884 | ||
de103c93 CH |
885 | static sense_reason_t |
886 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 887 | { |
9e999a6c | 888 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
889 | } |
890 | ||
452e2010 | 891 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
892 | { |
893 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
894 | struct block_device *bd = ib_dev->ibd_bd; | |
895 | struct request_queue *q = bdev_get_queue(bd); | |
896 | ||
c888a8f9 | 897 | return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
d0c8b259 NB |
898 | } |
899 | ||
0a06d430 | 900 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 901 | .name = "iblock", |
0fd97ccf CH |
902 | .inquiry_prod = "IBLOCK", |
903 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 904 | .owner = THIS_MODULE, |
c66ac9db NB |
905 | .attach_hba = iblock_attach_hba, |
906 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
907 | .alloc_device = iblock_alloc_device, |
908 | .configure_device = iblock_configure_device, | |
92634706 | 909 | .destroy_device = iblock_destroy_device, |
c66ac9db | 910 | .free_device = iblock_free_device, |
415ccd98 MC |
911 | .plug_device = iblock_plug_device, |
912 | .unplug_device = iblock_unplug_device, | |
0c2ad7d1 | 913 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
914 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
915 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 916 | .get_device_type = sbc_get_device_type, |
c66ac9db | 917 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
918 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
919 | .get_lbppbe = iblock_get_lbppbe, | |
920 | .get_io_min = iblock_get_io_min, | |
921 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 922 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 923 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
924 | }; |
925 | ||
926 | static int __init iblock_module_init(void) | |
927 | { | |
0a06d430 | 928 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
929 | } |
930 | ||
63b91d5a | 931 | static void __exit iblock_module_exit(void) |
c66ac9db | 932 | { |
0a06d430 | 933 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
934 | } |
935 | ||
936 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
937 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
938 | MODULE_LICENSE("GPL"); | |
939 | ||
940 | module_init(iblock_module_init); | |
941 | module_exit(iblock_module_exit); |