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> | |
fe45e630 | 19 | #include <linux/blk-integrity.h> |
c66ac9db NB |
20 | #include <linux/slab.h> |
21 | #include <linux/spinlock.h> | |
c66ac9db | 22 | #include <linux/bio.h> |
c66ac9db | 23 | #include <linux/file.h> |
827509e3 | 24 | #include <linux/module.h> |
24b83deb | 25 | #include <linux/scatterlist.h> |
ba929992 | 26 | #include <scsi/scsi_proto.h> |
14150a6b | 27 | #include <asm/unaligned.h> |
c66ac9db NB |
28 | |
29 | #include <target/target_core_base.h> | |
c4795fb2 | 30 | #include <target/target_core_backend.h> |
c66ac9db NB |
31 | |
32 | #include "target_core_iblock.h" | |
33 | ||
d5b4a21b CH |
34 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
35 | #define IBLOCK_BIO_POOL_SIZE 128 | |
36 | ||
0fd97ccf CH |
37 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
38 | { | |
39 | return container_of(dev, struct iblock_dev, dev); | |
40 | } | |
41 | ||
42 | ||
c66ac9db NB |
43 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
44 | { | |
6708bb27 | 45 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db | 46 | " Generic Target Core Stack %s\n", hba->hba_id, |
ce8dd25d | 47 | IBLOCK_VERSION, TARGET_CORE_VERSION); |
c66ac9db NB |
48 | return 0; |
49 | } | |
50 | ||
51 | static void iblock_detach_hba(struct se_hba *hba) | |
52 | { | |
c66ac9db NB |
53 | } |
54 | ||
0fd97ccf | 55 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
56 | { |
57 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
58 | |
59 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
60 | if (!ib_dev) { |
61 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
62 | return NULL; |
63 | } | |
c66ac9db | 64 | |
415ccd98 MC |
65 | ib_dev->ibd_plug = kcalloc(nr_cpu_ids, sizeof(*ib_dev->ibd_plug), |
66 | GFP_KERNEL); | |
67 | if (!ib_dev->ibd_plug) | |
68 | goto free_dev; | |
69 | ||
6708bb27 | 70 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 71 | |
0fd97ccf | 72 | return &ib_dev->dev; |
415ccd98 MC |
73 | |
74 | free_dev: | |
75 | kfree(ib_dev); | |
76 | return NULL; | |
c66ac9db NB |
77 | } |
78 | ||
0fd97ccf | 79 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 80 | { |
0fd97ccf | 81 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 82 | struct request_queue *q; |
0fd97ccf | 83 | struct block_device *bd = NULL; |
ecebbf6c | 84 | struct blk_integrity *bi; |
44bfd018 | 85 | fmode_t mode; |
2237498f | 86 | unsigned int max_write_zeroes_sectors; |
8f13142a | 87 | int ret; |
c66ac9db | 88 | |
0fd97ccf CH |
89 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
90 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
91 | return -EINVAL; | |
c66ac9db | 92 | } |
d5b4a21b | 93 | |
a47a28b7 KO |
94 | ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
95 | if (ret) { | |
0fd97ccf CH |
96 | pr_err("IBLOCK: Unable to create bioset\n"); |
97 | goto out; | |
c66ac9db | 98 | } |
0fd97ccf | 99 | |
6708bb27 | 100 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
101 | ib_dev->ibd_udev_path); |
102 | ||
44bfd018 AG |
103 | mode = FMODE_READ|FMODE_EXCL; |
104 | if (!ib_dev->ibd_readonly) | |
105 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
106 | else |
107 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
108 | |
109 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
110 | if (IS_ERR(bd)) { |
111 | ret = PTR_ERR(bd); | |
0fd97ccf | 112 | goto out_free_bioset; |
613640e4 | 113 | } |
c66ac9db NB |
114 | ib_dev->ibd_bd = bd; |
115 | ||
0fd97ccf CH |
116 | q = bdev_get_queue(bd); |
117 | ||
118 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
046ba642 | 119 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
0fd97ccf | 120 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 121 | |
817e8b51 | 122 | if (target_configure_unmap_from_queue(&dev->dev_attrib, bd)) |
6708bb27 | 123 | pr_debug("IBLOCK: BLOCK Discard support available," |
8a9ebe71 MC |
124 | " disabled by default\n"); |
125 | ||
f6970ad3 NB |
126 | /* |
127 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
128 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
129 | */ | |
2237498f NB |
130 | max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); |
131 | if (max_write_zeroes_sectors) | |
132 | dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; | |
133 | else | |
134 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 135 | |
e22a7f07 | 136 | if (blk_queue_nonrot(q)) |
0fd97ccf | 137 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 138 | |
ecebbf6c NB |
139 | bi = bdev_get_integrity(bd); |
140 | if (bi) { | |
a47a28b7 | 141 | struct bio_set *bs = &ib_dev->ibd_bio_set; |
ecebbf6c | 142 | |
0f8087ec MP |
143 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
144 | !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { | |
ecebbf6c | 145 | pr_err("IBLOCK export of blk_integrity: %s not" |
0f8087ec | 146 | " supported\n", bi->profile->name); |
ecebbf6c NB |
147 | ret = -ENOSYS; |
148 | goto out_blkdev_put; | |
149 | } | |
150 | ||
0f8087ec | 151 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
ecebbf6c | 152 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
0f8087ec | 153 | } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
ecebbf6c NB |
154 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
155 | } | |
156 | ||
157 | if (dev->dev_attrib.pi_prot_type) { | |
158 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
159 | pr_err("Unable to allocate bioset for PI\n"); | |
160 | ret = -ENOMEM; | |
161 | goto out_blkdev_put; | |
162 | } | |
163 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
f4f8154a | 164 | &bs->bio_integrity_pool); |
ecebbf6c NB |
165 | } |
166 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
167 | } | |
168 | ||
0fd97ccf | 169 | return 0; |
c66ac9db | 170 | |
ecebbf6c NB |
171 | out_blkdev_put: |
172 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf | 173 | out_free_bioset: |
a47a28b7 | 174 | bioset_exit(&ib_dev->ibd_bio_set); |
0fd97ccf CH |
175 | out: |
176 | return ret; | |
c66ac9db NB |
177 | } |
178 | ||
4cc987ea NB |
179 | static void iblock_dev_call_rcu(struct rcu_head *p) |
180 | { | |
181 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
182 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
183 | ||
415ccd98 | 184 | kfree(ib_dev->ibd_plug); |
4cc987ea NB |
185 | kfree(ib_dev); |
186 | } | |
187 | ||
0fd97ccf | 188 | static void iblock_free_device(struct se_device *dev) |
92634706 MC |
189 | { |
190 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); | |
191 | } | |
192 | ||
193 | static void iblock_destroy_device(struct se_device *dev) | |
c66ac9db | 194 | { |
0fd97ccf | 195 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 196 | |
bc665524 NB |
197 | if (ib_dev->ibd_bd != NULL) |
198 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
a47a28b7 | 199 | bioset_exit(&ib_dev->ibd_bio_set); |
c66ac9db NB |
200 | } |
201 | ||
415ccd98 MC |
202 | static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) |
203 | { | |
204 | struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); | |
205 | struct iblock_dev_plug *ib_dev_plug; | |
206 | ||
207 | /* | |
5aaeca25 | 208 | * Each se_device has a per cpu work this can be run from. We |
415ccd98 MC |
209 | * shouldn't have multiple threads on the same cpu calling this |
210 | * at the same time. | |
211 | */ | |
5aaeca25 | 212 | ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()]; |
415ccd98 MC |
213 | if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) |
214 | return NULL; | |
215 | ||
216 | blk_start_plug(&ib_dev_plug->blk_plug); | |
217 | return &ib_dev_plug->se_plug; | |
218 | } | |
219 | ||
220 | static void iblock_unplug_device(struct se_dev_plug *se_plug) | |
221 | { | |
222 | struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, | |
223 | struct iblock_dev_plug, se_plug); | |
224 | ||
225 | blk_finish_plug(&ib_dev_plug->blk_plug); | |
226 | clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); | |
227 | } | |
228 | ||
c66ac9db NB |
229 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
230 | struct se_device *dev, | |
231 | struct block_device *bd, | |
232 | struct request_queue *q) | |
233 | { | |
c66ac9db | 234 | u32 block_size = bdev_logical_block_size(bd); |
64f0f426 CH |
235 | unsigned long long blocks_long = |
236 | div_u64(bdev_nr_bytes(bd), block_size) - 1; | |
c66ac9db | 237 | |
0fd97ccf | 238 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
239 | return blocks_long; |
240 | ||
241 | switch (block_size) { | |
242 | case 4096: | |
0fd97ccf | 243 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
244 | case 2048: |
245 | blocks_long <<= 1; | |
246 | break; | |
247 | case 1024: | |
248 | blocks_long <<= 2; | |
249 | break; | |
250 | case 512: | |
251 | blocks_long <<= 3; | |
492096ec | 252 | break; |
c66ac9db NB |
253 | default: |
254 | break; | |
255 | } | |
256 | break; | |
257 | case 2048: | |
0fd97ccf | 258 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
259 | case 4096: |
260 | blocks_long >>= 1; | |
261 | break; | |
262 | case 1024: | |
263 | blocks_long <<= 1; | |
264 | break; | |
265 | case 512: | |
266 | blocks_long <<= 2; | |
267 | break; | |
268 | default: | |
269 | break; | |
270 | } | |
271 | break; | |
272 | case 1024: | |
0fd97ccf | 273 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
274 | case 4096: |
275 | blocks_long >>= 2; | |
276 | break; | |
277 | case 2048: | |
278 | blocks_long >>= 1; | |
279 | break; | |
280 | case 512: | |
281 | blocks_long <<= 1; | |
282 | break; | |
283 | default: | |
284 | break; | |
285 | } | |
286 | break; | |
287 | case 512: | |
0fd97ccf | 288 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
289 | case 4096: |
290 | blocks_long >>= 3; | |
291 | break; | |
292 | case 2048: | |
293 | blocks_long >>= 2; | |
294 | break; | |
295 | case 1024: | |
296 | blocks_long >>= 1; | |
297 | break; | |
298 | default: | |
299 | break; | |
300 | } | |
301 | break; | |
302 | default: | |
303 | break; | |
304 | } | |
305 | ||
306 | return blocks_long; | |
307 | } | |
308 | ||
3a41d85f NB |
309 | static void iblock_complete_cmd(struct se_cmd *cmd) |
310 | { | |
311 | struct iblock_req *ibr = cmd->priv; | |
312 | u8 status; | |
313 | ||
5981c245 | 314 | if (!refcount_dec_and_test(&ibr->pending)) |
3a41d85f NB |
315 | return; |
316 | ||
317 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
318 | status = SAM_STAT_CHECK_CONDITION; | |
319 | else | |
320 | status = SAM_STAT_GOOD; | |
321 | ||
322 | target_complete_cmd(cmd, status); | |
323 | kfree(ibr); | |
324 | } | |
325 | ||
4246a0b6 | 326 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
327 | { |
328 | struct se_cmd *cmd = bio->bi_private; | |
329 | struct iblock_req *ibr = cmd->priv; | |
330 | ||
4e4cbee9 CH |
331 | if (bio->bi_status) { |
332 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); | |
3a41d85f NB |
333 | /* |
334 | * Bump the ib_bio_err_cnt and release bio. | |
335 | */ | |
336 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 337 | smp_mb__after_atomic(); |
3a41d85f NB |
338 | } |
339 | ||
340 | bio_put(bio); | |
341 | ||
342 | iblock_complete_cmd(cmd); | |
343 | } | |
344 | ||
bc9e0e36 CK |
345 | static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, |
346 | unsigned int opf) | |
3a41d85f NB |
347 | { |
348 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
349 | struct bio *bio; | |
350 | ||
351 | /* | |
352 | * Only allocate as many vector entries as the bio code allows us to, | |
353 | * we'll loop later on until we have handled the whole request. | |
354 | */ | |
609be106 CH |
355 | bio = bio_alloc_bioset(ib_dev->ibd_bd, bio_max_segs(sg_num), opf, |
356 | GFP_NOIO, &ib_dev->ibd_bio_set); | |
3a41d85f NB |
357 | if (!bio) { |
358 | pr_err("Unable to allocate memory for bio\n"); | |
359 | return NULL; | |
360 | } | |
361 | ||
3a41d85f NB |
362 | bio->bi_private = cmd; |
363 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 364 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
365 | |
366 | return bio; | |
367 | } | |
368 | ||
4e49ea4a | 369 | static void iblock_submit_bios(struct bio_list *list) |
3a41d85f NB |
370 | { |
371 | struct blk_plug plug; | |
372 | struct bio *bio; | |
415ccd98 MC |
373 | /* |
374 | * The block layer handles nested plugs, so just plug/unplug to handle | |
375 | * fabric drivers that didn't support batching and multi bio cmds. | |
376 | */ | |
3a41d85f NB |
377 | blk_start_plug(&plug); |
378 | while ((bio = bio_list_pop(list))) | |
4e49ea4a | 379 | submit_bio(bio); |
3a41d85f NB |
380 | blk_finish_plug(&plug); |
381 | } | |
382 | ||
4246a0b6 | 383 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
384 | { |
385 | struct se_cmd *cmd = bio->bi_private; | |
386 | ||
4e4cbee9 CH |
387 | if (bio->bi_status) |
388 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); | |
df5fa691 | 389 | |
5787cacd | 390 | if (cmd) { |
4e4cbee9 | 391 | if (bio->bi_status) |
5787cacd | 392 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 393 | else |
5787cacd | 394 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
395 | } |
396 | ||
df5fa691 CH |
397 | bio_put(bio); |
398 | } | |
399 | ||
c66ac9db | 400 | /* |
df5fa691 CH |
401 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
402 | * always flush the whole cache. | |
c66ac9db | 403 | */ |
de103c93 CH |
404 | static sense_reason_t |
405 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 406 | { |
0fd97ccf | 407 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 408 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 409 | struct bio *bio; |
c66ac9db NB |
410 | |
411 | /* | |
412 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 413 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
414 | */ |
415 | if (immed) | |
5787cacd | 416 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 417 | |
07888c66 CH |
418 | bio = bio_alloc(ib_dev->ibd_bd, 0, REQ_OP_WRITE | REQ_PREFLUSH, |
419 | GFP_KERNEL); | |
df5fa691 | 420 | bio->bi_end_io = iblock_end_io_flush; |
c66ac9db | 421 | if (!immed) |
df5fa691 | 422 | bio->bi_private = cmd; |
4e49ea4a | 423 | submit_bio(bio); |
ad67f0d9 | 424 | return 0; |
c66ac9db NB |
425 | } |
426 | ||
dbc21c5a | 427 | static sense_reason_t |
62e46942 | 428 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 429 | { |
62e46942 | 430 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 431 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
432 | int ret; |
433 | ||
8a9ebe71 MC |
434 | ret = blkdev_issue_discard(bdev, |
435 | target_to_linux_sector(dev, lba), | |
436 | target_to_linux_sector(dev, nolb), | |
437 | GFP_KERNEL, 0); | |
dbc21c5a AH |
438 | if (ret < 0) { |
439 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
440 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
07b63196 | 446 | static sense_reason_t |
2237498f | 447 | iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) |
07b63196 MC |
448 | { |
449 | struct se_device *dev = cmd->se_dev; | |
450 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
f5957dad BL |
451 | unsigned char *buf, *not_zero; |
452 | int ret; | |
07b63196 | 453 | |
2237498f NB |
454 | buf = kmap(sg_page(sg)) + sg->offset; |
455 | if (!buf) | |
456 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
457 | /* | |
458 | * Fall back to block_execute_write_same() slow-path if | |
459 | * incoming WRITE_SAME payload does not contain zeros. | |
460 | */ | |
f5957dad | 461 | not_zero = memchr_inv(buf, 0x00, cmd->data_length); |
2237498f | 462 | kunmap(sg_page(sg)); |
07b63196 | 463 | |
f5957dad | 464 | if (not_zero) |
2237498f | 465 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
07b63196 | 466 | |
2237498f | 467 | ret = blkdev_issue_zeroout(bdev, |
07b63196 MC |
468 | target_to_linux_sector(dev, cmd->t_task_lba), |
469 | target_to_linux_sector(dev, | |
470 | sbc_get_write_same_sectors(cmd)), | |
1d2ff149 | 471 | GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
07b63196 MC |
472 | if (ret) |
473 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
474 | ||
14b40c1e | 475 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
07b63196 MC |
476 | return 0; |
477 | } | |
478 | ||
f6970ad3 NB |
479 | static sense_reason_t |
480 | iblock_execute_write_same(struct se_cmd *cmd) | |
481 | { | |
07b63196 | 482 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
483 | struct iblock_req *ibr; |
484 | struct scatterlist *sg; | |
485 | struct bio *bio; | |
486 | struct bio_list list; | |
8a9ebe71 MC |
487 | struct se_device *dev = cmd->se_dev; |
488 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
489 | sector_t sectors = target_to_linux_sector(dev, | |
490 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 491 | |
afd73f1b NB |
492 | if (cmd->prot_op) { |
493 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
494 | " backends not supported\n"); | |
495 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
496 | } | |
f6970ad3 NB |
497 | sg = &cmd->t_data_sg[0]; |
498 | ||
499 | if (cmd->t_data_nents > 1 || | |
500 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
501 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
502 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
503 | cmd->se_dev->dev_attrib.block_size); | |
504 | return TCM_INVALID_CDB_FIELD; | |
505 | } | |
506 | ||
2237498f NB |
507 | if (bdev_write_zeroes_sectors(bdev)) { |
508 | if (!iblock_execute_zero_out(bdev, cmd)) | |
509 | return 0; | |
510 | } | |
07b63196 | 511 | |
f6970ad3 NB |
512 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
513 | if (!ibr) | |
514 | goto fail; | |
515 | cmd->priv = ibr; | |
516 | ||
bc9e0e36 | 517 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); |
f6970ad3 NB |
518 | if (!bio) |
519 | goto fail_free_ibr; | |
520 | ||
521 | bio_list_init(&list); | |
522 | bio_list_add(&list, bio); | |
523 | ||
5981c245 | 524 | refcount_set(&ibr->pending, 1); |
f6970ad3 NB |
525 | |
526 | while (sectors) { | |
527 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
528 | != sg->length) { | |
529 | ||
bc9e0e36 | 530 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); |
f6970ad3 NB |
531 | if (!bio) |
532 | goto fail_put_bios; | |
533 | ||
5981c245 | 534 | refcount_inc(&ibr->pending); |
f6970ad3 NB |
535 | bio_list_add(&list, bio); |
536 | } | |
537 | ||
538 | /* Always in 512 byte units for Linux/Block */ | |
80b045b3 | 539 | block_lba += sg->length >> SECTOR_SHIFT; |
5676234f | 540 | sectors -= sg->length >> SECTOR_SHIFT; |
f6970ad3 NB |
541 | } |
542 | ||
4e49ea4a | 543 | iblock_submit_bios(&list); |
f6970ad3 NB |
544 | return 0; |
545 | ||
546 | fail_put_bios: | |
547 | while ((bio = bio_list_pop(&list))) | |
548 | bio_put(bio); | |
549 | fail_free_ibr: | |
550 | kfree(ibr); | |
551 | fail: | |
552 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
553 | } | |
554 | ||
c66ac9db | 555 | enum { |
44bfd018 | 556 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
557 | }; |
558 | ||
559 | static match_table_t tokens = { | |
560 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 561 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
562 | {Opt_force, "force=%d"}, |
563 | {Opt_err, NULL} | |
564 | }; | |
565 | ||
0fd97ccf CH |
566 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
567 | const char *page, ssize_t count) | |
c66ac9db | 568 | { |
0fd97ccf | 569 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 570 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 571 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 572 | int ret = 0, token; |
44bfd018 | 573 | unsigned long tmp_readonly; |
c66ac9db NB |
574 | |
575 | opts = kstrdup(page, GFP_KERNEL); | |
576 | if (!opts) | |
577 | return -ENOMEM; | |
578 | ||
579 | orig = opts; | |
580 | ||
90c161b6 | 581 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
582 | if (!*ptr) |
583 | continue; | |
584 | ||
585 | token = match_token(ptr, tokens, args); | |
586 | switch (token) { | |
587 | case Opt_udev_path: | |
588 | if (ib_dev->ibd_bd) { | |
6708bb27 | 589 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
590 | " ib_dev->ibd_bd exists\n"); |
591 | ret = -EEXIST; | |
592 | goto out; | |
593 | } | |
852b6ed1 NB |
594 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
595 | SE_UDEV_PATH_LEN) == 0) { | |
596 | ret = -EINVAL; | |
6d180253 JJ |
597 | break; |
598 | } | |
6708bb27 | 599 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
600 | ib_dev->ibd_udev_path); |
601 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
602 | break; | |
44bfd018 AG |
603 | case Opt_readonly: |
604 | arg_p = match_strdup(&args[0]); | |
605 | if (!arg_p) { | |
606 | ret = -ENOMEM; | |
607 | break; | |
608 | } | |
57103d7f | 609 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
610 | kfree(arg_p); |
611 | if (ret < 0) { | |
57103d7f | 612 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
613 | " readonly=\n"); |
614 | goto out; | |
615 | } | |
616 | ib_dev->ibd_readonly = tmp_readonly; | |
617 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
618 | break; | |
c66ac9db | 619 | case Opt_force: |
c66ac9db NB |
620 | break; |
621 | default: | |
622 | break; | |
623 | } | |
624 | } | |
625 | ||
626 | out: | |
627 | kfree(orig); | |
628 | return (!ret) ? count : ret; | |
629 | } | |
630 | ||
0fd97ccf | 631 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 632 | { |
0fd97ccf CH |
633 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
634 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
635 | ssize_t bl = 0; |
636 | ||
637 | if (bd) | |
1b74ab77 | 638 | bl += sprintf(b + bl, "iBlock device: %pg", bd); |
0fd97ccf | 639 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 640 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
641 | ib_dev->ibd_udev_path); |
642 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
643 | |
644 | bl += sprintf(b + bl, " "); | |
645 | if (bd) { | |
646 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
57ba1059 CH |
647 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), |
648 | "CLAIMED: IBLOCK"); | |
c66ac9db | 649 | } else { |
21bca31c | 650 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
651 | } |
652 | ||
653 | return bl; | |
654 | } | |
655 | ||
ecebbf6c | 656 | static int |
fed564f6 GE |
657 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, |
658 | struct sg_mapping_iter *miter) | |
ecebbf6c NB |
659 | { |
660 | struct se_device *dev = cmd->se_dev; | |
661 | struct blk_integrity *bi; | |
662 | struct bio_integrity_payload *bip; | |
663 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
fed564f6 GE |
664 | int rc; |
665 | size_t resid, len; | |
ecebbf6c NB |
666 | |
667 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
668 | if (!bi) { | |
669 | pr_err("Unable to locate bio_integrity\n"); | |
670 | return -ENODEV; | |
671 | } | |
672 | ||
5f7136db | 673 | bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); |
06c1e390 | 674 | if (IS_ERR(bip)) { |
ecebbf6c | 675 | pr_err("Unable to allocate bio_integrity_payload\n"); |
06c1e390 | 676 | return PTR_ERR(bip); |
ecebbf6c NB |
677 | } |
678 | ||
fed564f6 | 679 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); |
e4dc9a4c IR |
680 | /* virtual start sector must be in integrity interval units */ |
681 | bip_set_seed(bip, bio->bi_iter.bi_sector >> | |
682 | (bi->interval_exp - SECTOR_SHIFT)); | |
ecebbf6c | 683 | |
4e13c5d0 LT |
684 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
685 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c | 686 | |
fed564f6 GE |
687 | resid = bip->bip_iter.bi_size; |
688 | while (resid > 0 && sg_miter_next(miter)) { | |
ecebbf6c | 689 | |
fed564f6 GE |
690 | len = min_t(size_t, miter->length, resid); |
691 | rc = bio_integrity_add_page(bio, miter->page, len, | |
692 | offset_in_page(miter->addr)); | |
693 | if (rc != len) { | |
ecebbf6c | 694 | pr_err("bio_integrity_add_page() failed; %d\n", rc); |
fed564f6 | 695 | sg_miter_stop(miter); |
ecebbf6c NB |
696 | return -ENOMEM; |
697 | } | |
698 | ||
fed564f6 GE |
699 | pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", |
700 | miter->page, len, offset_in_page(miter->addr)); | |
701 | ||
702 | resid -= len; | |
703 | if (len < miter->length) | |
704 | miter->consumed -= miter->length - len; | |
ecebbf6c | 705 | } |
fed564f6 | 706 | sg_miter_stop(miter); |
ecebbf6c NB |
707 | |
708 | return 0; | |
709 | } | |
710 | ||
de103c93 | 711 | static sense_reason_t |
a82a9538 NB |
712 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
713 | enum dma_data_direction data_direction) | |
c66ac9db | 714 | { |
5951146d | 715 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 716 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
5787cacd | 717 | struct iblock_req *ibr; |
fed564f6 | 718 | struct bio *bio; |
dbbf3e94 | 719 | struct bio_list list; |
c66ac9db | 720 | struct scatterlist *sg; |
5787cacd | 721 | u32 sg_num = sgl_nents; |
bc9e0e36 | 722 | unsigned int opf; |
d5b4a21b | 723 | unsigned bio_cnt; |
bc9e0e36 | 724 | int i, rc; |
fed564f6 | 725 | struct sg_mapping_iter prot_miter; |
bc9e0e36 | 726 | unsigned int miter_dir; |
dbbf3e94 | 727 | |
5787cacd | 728 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
729 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
730 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 731 | /* |
70fd7614 | 732 | * Force writethrough using REQ_FUA if a volatile write cache |
d0c8b259 | 733 | * is not enabled, or if initiator set the Force Unit Access bit. |
dbbf3e94 | 734 | */ |
bc9e0e36 CK |
735 | opf = REQ_OP_WRITE; |
736 | miter_dir = SG_MITER_TO_SG; | |
c888a8f9 | 737 | if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
d0c8b259 | 738 | if (cmd->se_cmd_flags & SCF_FUA) |
bc9e0e36 | 739 | opf |= REQ_FUA; |
c888a8f9 | 740 | else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
bc9e0e36 | 741 | opf |= REQ_FUA; |
d0c8b259 | 742 | } |
dbbf3e94 | 743 | } else { |
bc9e0e36 CK |
744 | opf = REQ_OP_READ; |
745 | miter_dir = SG_MITER_FROM_SG; | |
dbbf3e94 CH |
746 | } |
747 | ||
5787cacd CH |
748 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
749 | if (!ibr) | |
750 | goto fail; | |
751 | cmd->priv = ibr; | |
752 | ||
e0de4457 | 753 | if (!sgl_nents) { |
5981c245 | 754 | refcount_set(&ibr->pending, 1); |
e0de4457 PB |
755 | iblock_complete_cmd(cmd); |
756 | return 0; | |
757 | } | |
758 | ||
bc9e0e36 | 759 | bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); |
5787cacd CH |
760 | if (!bio) |
761 | goto fail_free_ibr; | |
dbbf3e94 CH |
762 | |
763 | bio_list_init(&list); | |
764 | bio_list_add(&list, bio); | |
5787cacd | 765 | |
5981c245 | 766 | refcount_set(&ibr->pending, 2); |
d5b4a21b | 767 | bio_cnt = 1; |
c66ac9db | 768 | |
fed564f6 GE |
769 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) |
770 | sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, | |
bc9e0e36 | 771 | miter_dir); |
fed564f6 | 772 | |
5787cacd | 773 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
774 | /* |
775 | * XXX: if the length the device accepts is shorter than the | |
776 | * length of the S/G list entry this will cause and | |
777 | * endless loop. Better hope no driver uses huge pages. | |
778 | */ | |
779 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
780 | != sg->length) { | |
fed564f6 GE |
781 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
782 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); | |
783 | if (rc) | |
784 | goto fail_put_bios; | |
785 | } | |
786 | ||
d5b4a21b | 787 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
4e49ea4a | 788 | iblock_submit_bios(&list); |
d5b4a21b CH |
789 | bio_cnt = 0; |
790 | } | |
791 | ||
bc9e0e36 | 792 | bio = iblock_get_bio(cmd, block_lba, sg_num, opf); |
6708bb27 | 793 | if (!bio) |
5787cacd CH |
794 | goto fail_put_bios; |
795 | ||
5981c245 | 796 | refcount_inc(&ibr->pending); |
dbbf3e94 | 797 | bio_list_add(&list, bio); |
d5b4a21b | 798 | bio_cnt++; |
c66ac9db | 799 | } |
dbbf3e94 | 800 | |
c66ac9db | 801 | /* Always in 512 byte units for Linux/Block */ |
80b045b3 | 802 | block_lba += sg->length >> SECTOR_SHIFT; |
c66ac9db | 803 | sg_num--; |
c66ac9db NB |
804 | } |
805 | ||
6f16ec43 | 806 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
fed564f6 | 807 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); |
ecebbf6c NB |
808 | if (rc) |
809 | goto fail_put_bios; | |
810 | } | |
811 | ||
4e49ea4a | 812 | iblock_submit_bios(&list); |
5787cacd | 813 | iblock_complete_cmd(cmd); |
03e98c9e | 814 | return 0; |
dbbf3e94 | 815 | |
5787cacd | 816 | fail_put_bios: |
dbbf3e94 | 817 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 818 | bio_put(bio); |
5787cacd CH |
819 | fail_free_ibr: |
820 | kfree(ibr); | |
5787cacd | 821 | fail: |
de103c93 | 822 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
823 | } |
824 | ||
c66ac9db NB |
825 | static sector_t iblock_get_blocks(struct se_device *dev) |
826 | { | |
0fd97ccf CH |
827 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
828 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
829 | struct request_queue *q = bdev_get_queue(bd); |
830 | ||
831 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
832 | } | |
833 | ||
7f7caf6a AG |
834 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
835 | { | |
836 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
837 | struct block_device *bd = ib_dev->ibd_bd; | |
838 | int ret; | |
839 | ||
840 | ret = bdev_alignment_offset(bd); | |
841 | if (ret == -1) | |
842 | return 0; | |
843 | ||
844 | /* convert offset-bytes to offset-lbas */ | |
845 | return ret / bdev_logical_block_size(bd); | |
846 | } | |
847 | ||
848 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
849 | { | |
850 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
851 | struct block_device *bd = ib_dev->ibd_bd; | |
c151eddb | 852 | unsigned int logs_per_phys = |
a2c6c6a3 | 853 | bdev_physical_block_size(bd) / bdev_logical_block_size(bd); |
7f7caf6a AG |
854 | |
855 | return ilog2(logs_per_phys); | |
856 | } | |
857 | ||
858 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
859 | { | |
860 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
861 | struct block_device *bd = ib_dev->ibd_bd; | |
862 | ||
863 | return bdev_io_min(bd); | |
864 | } | |
865 | ||
866 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
867 | { | |
868 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
869 | struct block_device *bd = ib_dev->ibd_bd; | |
870 | ||
871 | return bdev_io_opt(bd); | |
872 | } | |
873 | ||
9e999a6c | 874 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 875 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 876 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 877 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 878 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
879 | }; |
880 | ||
de103c93 CH |
881 | static sense_reason_t |
882 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 883 | { |
9e999a6c | 884 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
885 | } |
886 | ||
452e2010 | 887 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 NB |
888 | { |
889 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
890 | struct block_device *bd = ib_dev->ibd_bd; | |
891 | struct request_queue *q = bdev_get_queue(bd); | |
892 | ||
c888a8f9 | 893 | return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
d0c8b259 NB |
894 | } |
895 | ||
0a06d430 | 896 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 897 | .name = "iblock", |
0fd97ccf CH |
898 | .inquiry_prod = "IBLOCK", |
899 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 900 | .owner = THIS_MODULE, |
c66ac9db NB |
901 | .attach_hba = iblock_attach_hba, |
902 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
903 | .alloc_device = iblock_alloc_device, |
904 | .configure_device = iblock_configure_device, | |
92634706 | 905 | .destroy_device = iblock_destroy_device, |
c66ac9db | 906 | .free_device = iblock_free_device, |
415ccd98 MC |
907 | .plug_device = iblock_plug_device, |
908 | .unplug_device = iblock_unplug_device, | |
0c2ad7d1 | 909 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
910 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
911 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 912 | .get_device_type = sbc_get_device_type, |
c66ac9db | 913 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
914 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
915 | .get_lbppbe = iblock_get_lbppbe, | |
916 | .get_io_min = iblock_get_io_min, | |
917 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 918 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 919 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
920 | }; |
921 | ||
922 | static int __init iblock_module_init(void) | |
923 | { | |
0a06d430 | 924 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
925 | } |
926 | ||
63b91d5a | 927 | static void __exit iblock_module_exit(void) |
c66ac9db | 928 | { |
0a06d430 | 929 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
930 | } |
931 | ||
932 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
933 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
934 | MODULE_LICENSE("GPL"); | |
935 | ||
936 | module_init(iblock_module_init); | |
937 | module_exit(iblock_module_exit); |