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 | ||
d7c382c5 MC |
79 | static bool iblock_configure_unmap(struct se_device *dev) |
80 | { | |
81 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
82 | ||
83 | return target_configure_unmap_from_queue(&dev->dev_attrib, | |
84 | ib_dev->ibd_bd); | |
85 | } | |
86 | ||
0fd97ccf | 87 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 88 | { |
0fd97ccf | 89 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 90 | struct request_queue *q; |
0fd97ccf | 91 | struct block_device *bd = NULL; |
ecebbf6c | 92 | struct blk_integrity *bi; |
44bfd018 | 93 | fmode_t mode; |
2237498f | 94 | unsigned int max_write_zeroes_sectors; |
8f13142a | 95 | int ret; |
c66ac9db | 96 | |
0fd97ccf CH |
97 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
98 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
99 | return -EINVAL; | |
c66ac9db | 100 | } |
d5b4a21b | 101 | |
a47a28b7 KO |
102 | ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); |
103 | if (ret) { | |
0fd97ccf CH |
104 | pr_err("IBLOCK: Unable to create bioset\n"); |
105 | goto out; | |
c66ac9db | 106 | } |
0fd97ccf | 107 | |
6708bb27 | 108 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
109 | ib_dev->ibd_udev_path); |
110 | ||
44bfd018 AG |
111 | mode = FMODE_READ|FMODE_EXCL; |
112 | if (!ib_dev->ibd_readonly) | |
113 | mode |= FMODE_WRITE; | |
eeeb9522 NB |
114 | else |
115 | dev->dev_flags |= DF_READ_ONLY; | |
44bfd018 AG |
116 | |
117 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
118 | if (IS_ERR(bd)) { |
119 | ret = PTR_ERR(bd); | |
0fd97ccf | 120 | goto out_free_bioset; |
613640e4 | 121 | } |
c66ac9db NB |
122 | ib_dev->ibd_bd = bd; |
123 | ||
0fd97ccf CH |
124 | q = bdev_get_queue(bd); |
125 | ||
126 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
9375031e AK |
127 | dev->dev_attrib.hw_max_sectors = mult_frac(queue_max_hw_sectors(q), |
128 | SECTOR_SIZE, | |
129 | dev->dev_attrib.hw_block_size); | |
0fd97ccf | 130 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
c66ac9db | 131 | |
f6970ad3 NB |
132 | /* |
133 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
134 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
135 | */ | |
2237498f NB |
136 | max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); |
137 | if (max_write_zeroes_sectors) | |
138 | dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; | |
139 | else | |
140 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 141 | |
10f0d2a5 | 142 | if (bdev_nonrot(bd)) |
0fd97ccf | 143 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 144 | |
ecebbf6c NB |
145 | bi = bdev_get_integrity(bd); |
146 | if (bi) { | |
a47a28b7 | 147 | struct bio_set *bs = &ib_dev->ibd_bio_set; |
ecebbf6c | 148 | |
0f8087ec MP |
149 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
150 | !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { | |
ecebbf6c | 151 | pr_err("IBLOCK export of blk_integrity: %s not" |
0f8087ec | 152 | " supported\n", bi->profile->name); |
ecebbf6c NB |
153 | ret = -ENOSYS; |
154 | goto out_blkdev_put; | |
155 | } | |
156 | ||
0f8087ec | 157 | if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
ecebbf6c | 158 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
0f8087ec | 159 | } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
ecebbf6c NB |
160 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
161 | } | |
162 | ||
163 | if (dev->dev_attrib.pi_prot_type) { | |
164 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { | |
165 | pr_err("Unable to allocate bioset for PI\n"); | |
166 | ret = -ENOMEM; | |
167 | goto out_blkdev_put; | |
168 | } | |
169 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", | |
f4f8154a | 170 | &bs->bio_integrity_pool); |
ecebbf6c NB |
171 | } |
172 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; | |
173 | } | |
174 | ||
0fd97ccf | 175 | return 0; |
c66ac9db | 176 | |
ecebbf6c NB |
177 | out_blkdev_put: |
178 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
0fd97ccf | 179 | out_free_bioset: |
a47a28b7 | 180 | bioset_exit(&ib_dev->ibd_bio_set); |
0fd97ccf CH |
181 | out: |
182 | return ret; | |
c66ac9db NB |
183 | } |
184 | ||
4cc987ea NB |
185 | static void iblock_dev_call_rcu(struct rcu_head *p) |
186 | { | |
187 | struct se_device *dev = container_of(p, struct se_device, rcu_head); | |
188 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
189 | ||
415ccd98 | 190 | kfree(ib_dev->ibd_plug); |
4cc987ea NB |
191 | kfree(ib_dev); |
192 | } | |
193 | ||
0fd97ccf | 194 | static void iblock_free_device(struct se_device *dev) |
92634706 MC |
195 | { |
196 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); | |
197 | } | |
198 | ||
199 | static void iblock_destroy_device(struct se_device *dev) | |
c66ac9db | 200 | { |
0fd97ccf | 201 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 202 | |
bc665524 NB |
203 | if (ib_dev->ibd_bd != NULL) |
204 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
a47a28b7 | 205 | bioset_exit(&ib_dev->ibd_bio_set); |
c66ac9db NB |
206 | } |
207 | ||
415ccd98 MC |
208 | static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) |
209 | { | |
210 | struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); | |
211 | struct iblock_dev_plug *ib_dev_plug; | |
212 | ||
213 | /* | |
5aaeca25 | 214 | * Each se_device has a per cpu work this can be run from. We |
415ccd98 MC |
215 | * shouldn't have multiple threads on the same cpu calling this |
216 | * at the same time. | |
217 | */ | |
5aaeca25 | 218 | ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()]; |
415ccd98 MC |
219 | if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) |
220 | return NULL; | |
221 | ||
222 | blk_start_plug(&ib_dev_plug->blk_plug); | |
223 | return &ib_dev_plug->se_plug; | |
224 | } | |
225 | ||
226 | static void iblock_unplug_device(struct se_dev_plug *se_plug) | |
227 | { | |
228 | struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, | |
229 | struct iblock_dev_plug, se_plug); | |
230 | ||
231 | blk_finish_plug(&ib_dev_plug->blk_plug); | |
232 | clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); | |
233 | } | |
234 | ||
f915f58e | 235 | static sector_t iblock_get_blocks(struct se_device *dev) |
c66ac9db | 236 | { |
f915f58e CH |
237 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
238 | u32 block_size = bdev_logical_block_size(ib_dev->ibd_bd); | |
64f0f426 | 239 | unsigned long long blocks_long = |
f915f58e | 240 | div_u64(bdev_nr_bytes(ib_dev->ibd_bd), block_size) - 1; |
c66ac9db | 241 | |
0fd97ccf | 242 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
243 | return blocks_long; |
244 | ||
245 | switch (block_size) { | |
246 | case 4096: | |
0fd97ccf | 247 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
248 | case 2048: |
249 | blocks_long <<= 1; | |
250 | break; | |
251 | case 1024: | |
252 | blocks_long <<= 2; | |
253 | break; | |
254 | case 512: | |
255 | blocks_long <<= 3; | |
492096ec | 256 | break; |
c66ac9db NB |
257 | default: |
258 | break; | |
259 | } | |
260 | break; | |
261 | case 2048: | |
0fd97ccf | 262 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
263 | case 4096: |
264 | blocks_long >>= 1; | |
265 | break; | |
266 | case 1024: | |
267 | blocks_long <<= 1; | |
268 | break; | |
269 | case 512: | |
270 | blocks_long <<= 2; | |
271 | break; | |
272 | default: | |
273 | break; | |
274 | } | |
275 | break; | |
276 | case 1024: | |
0fd97ccf | 277 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
278 | case 4096: |
279 | blocks_long >>= 2; | |
280 | break; | |
281 | case 2048: | |
282 | blocks_long >>= 1; | |
283 | break; | |
284 | case 512: | |
285 | blocks_long <<= 1; | |
286 | break; | |
287 | default: | |
288 | break; | |
289 | } | |
290 | break; | |
291 | case 512: | |
0fd97ccf | 292 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
293 | case 4096: |
294 | blocks_long >>= 3; | |
295 | break; | |
296 | case 2048: | |
297 | blocks_long >>= 2; | |
298 | break; | |
299 | case 1024: | |
300 | blocks_long >>= 1; | |
301 | break; | |
302 | default: | |
303 | break; | |
304 | } | |
305 | break; | |
306 | default: | |
307 | break; | |
308 | } | |
309 | ||
310 | return blocks_long; | |
311 | } | |
312 | ||
3a41d85f NB |
313 | static void iblock_complete_cmd(struct se_cmd *cmd) |
314 | { | |
315 | struct iblock_req *ibr = cmd->priv; | |
316 | u8 status; | |
317 | ||
5981c245 | 318 | if (!refcount_dec_and_test(&ibr->pending)) |
3a41d85f NB |
319 | return; |
320 | ||
321 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
322 | status = SAM_STAT_CHECK_CONDITION; | |
323 | else | |
324 | status = SAM_STAT_GOOD; | |
325 | ||
326 | target_complete_cmd(cmd, status); | |
327 | kfree(ibr); | |
328 | } | |
329 | ||
4246a0b6 | 330 | static void iblock_bio_done(struct bio *bio) |
3a41d85f NB |
331 | { |
332 | struct se_cmd *cmd = bio->bi_private; | |
333 | struct iblock_req *ibr = cmd->priv; | |
334 | ||
4e4cbee9 CH |
335 | if (bio->bi_status) { |
336 | pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); | |
3a41d85f NB |
337 | /* |
338 | * Bump the ib_bio_err_cnt and release bio. | |
339 | */ | |
340 | atomic_inc(&ibr->ib_bio_err_cnt); | |
4e857c58 | 341 | smp_mb__after_atomic(); |
3a41d85f NB |
342 | } |
343 | ||
344 | bio_put(bio); | |
345 | ||
346 | iblock_complete_cmd(cmd); | |
347 | } | |
348 | ||
bc9e0e36 | 349 | static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, |
79fe9d7d | 350 | blk_opf_t opf) |
3a41d85f NB |
351 | { |
352 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
353 | struct bio *bio; | |
354 | ||
355 | /* | |
356 | * Only allocate as many vector entries as the bio code allows us to, | |
357 | * we'll loop later on until we have handled the whole request. | |
358 | */ | |
609be106 CH |
359 | bio = bio_alloc_bioset(ib_dev->ibd_bd, bio_max_segs(sg_num), opf, |
360 | GFP_NOIO, &ib_dev->ibd_bio_set); | |
3a41d85f NB |
361 | if (!bio) { |
362 | pr_err("Unable to allocate memory for bio\n"); | |
363 | return NULL; | |
364 | } | |
365 | ||
3a41d85f NB |
366 | bio->bi_private = cmd; |
367 | bio->bi_end_io = &iblock_bio_done; | |
4f024f37 | 368 | bio->bi_iter.bi_sector = lba; |
3a41d85f NB |
369 | |
370 | return bio; | |
371 | } | |
372 | ||
4e49ea4a | 373 | static void iblock_submit_bios(struct bio_list *list) |
3a41d85f NB |
374 | { |
375 | struct blk_plug plug; | |
376 | struct bio *bio; | |
415ccd98 MC |
377 | /* |
378 | * The block layer handles nested plugs, so just plug/unplug to handle | |
379 | * fabric drivers that didn't support batching and multi bio cmds. | |
380 | */ | |
3a41d85f NB |
381 | blk_start_plug(&plug); |
382 | while ((bio = bio_list_pop(list))) | |
4e49ea4a | 383 | submit_bio(bio); |
3a41d85f NB |
384 | blk_finish_plug(&plug); |
385 | } | |
386 | ||
4246a0b6 | 387 | static void iblock_end_io_flush(struct bio *bio) |
df5fa691 CH |
388 | { |
389 | struct se_cmd *cmd = bio->bi_private; | |
390 | ||
4e4cbee9 CH |
391 | if (bio->bi_status) |
392 | pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); | |
df5fa691 | 393 | |
5787cacd | 394 | if (cmd) { |
4e4cbee9 | 395 | if (bio->bi_status) |
5787cacd | 396 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 397 | else |
5787cacd | 398 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
399 | } |
400 | ||
df5fa691 CH |
401 | bio_put(bio); |
402 | } | |
403 | ||
c66ac9db | 404 | /* |
df5fa691 CH |
405 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
406 | * always flush the whole cache. | |
c66ac9db | 407 | */ |
de103c93 CH |
408 | static sense_reason_t |
409 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 410 | { |
0fd97ccf | 411 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 412 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 413 | struct bio *bio; |
c66ac9db NB |
414 | |
415 | /* | |
416 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 417 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
418 | */ |
419 | if (immed) | |
5787cacd | 420 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 421 | |
07888c66 CH |
422 | bio = bio_alloc(ib_dev->ibd_bd, 0, REQ_OP_WRITE | REQ_PREFLUSH, |
423 | GFP_KERNEL); | |
df5fa691 | 424 | bio->bi_end_io = iblock_end_io_flush; |
c66ac9db | 425 | if (!immed) |
df5fa691 | 426 | bio->bi_private = cmd; |
4e49ea4a | 427 | submit_bio(bio); |
ad67f0d9 | 428 | return 0; |
c66ac9db NB |
429 | } |
430 | ||
dbc21c5a | 431 | static sense_reason_t |
62e46942 | 432 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
dbc21c5a | 433 | { |
62e46942 | 434 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
8a9ebe71 | 435 | struct se_device *dev = cmd->se_dev; |
dbc21c5a AH |
436 | int ret; |
437 | ||
8a9ebe71 MC |
438 | ret = blkdev_issue_discard(bdev, |
439 | target_to_linux_sector(dev, lba), | |
440 | target_to_linux_sector(dev, nolb), | |
44abff2c | 441 | GFP_KERNEL); |
dbc21c5a AH |
442 | if (ret < 0) { |
443 | pr_err("blkdev_issue_discard() failed: %d\n", ret); | |
444 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
445 | } | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
07b63196 | 450 | static sense_reason_t |
2237498f | 451 | iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) |
07b63196 MC |
452 | { |
453 | struct se_device *dev = cmd->se_dev; | |
454 | struct scatterlist *sg = &cmd->t_data_sg[0]; | |
f5957dad BL |
455 | unsigned char *buf, *not_zero; |
456 | int ret; | |
07b63196 | 457 | |
2237498f NB |
458 | buf = kmap(sg_page(sg)) + sg->offset; |
459 | if (!buf) | |
460 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
461 | /* | |
462 | * Fall back to block_execute_write_same() slow-path if | |
463 | * incoming WRITE_SAME payload does not contain zeros. | |
464 | */ | |
f5957dad | 465 | not_zero = memchr_inv(buf, 0x00, cmd->data_length); |
2237498f | 466 | kunmap(sg_page(sg)); |
07b63196 | 467 | |
f5957dad | 468 | if (not_zero) |
2237498f | 469 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
07b63196 | 470 | |
2237498f | 471 | ret = blkdev_issue_zeroout(bdev, |
07b63196 MC |
472 | target_to_linux_sector(dev, cmd->t_task_lba), |
473 | target_to_linux_sector(dev, | |
474 | sbc_get_write_same_sectors(cmd)), | |
1d2ff149 | 475 | GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
07b63196 MC |
476 | if (ret) |
477 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
478 | ||
14b40c1e | 479 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
07b63196 MC |
480 | return 0; |
481 | } | |
482 | ||
f6970ad3 NB |
483 | static sense_reason_t |
484 | iblock_execute_write_same(struct se_cmd *cmd) | |
485 | { | |
07b63196 | 486 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
f6970ad3 NB |
487 | struct iblock_req *ibr; |
488 | struct scatterlist *sg; | |
489 | struct bio *bio; | |
490 | struct bio_list list; | |
8a9ebe71 MC |
491 | struct se_device *dev = cmd->se_dev; |
492 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); | |
493 | sector_t sectors = target_to_linux_sector(dev, | |
494 | sbc_get_write_same_sectors(cmd)); | |
f6970ad3 | 495 | |
afd73f1b NB |
496 | if (cmd->prot_op) { |
497 | pr_err("WRITE_SAME: Protection information with IBLOCK" | |
498 | " backends not supported\n"); | |
499 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
500 | } | |
ccd3f449 MC |
501 | |
502 | if (!cmd->t_data_nents) | |
503 | return TCM_INVALID_CDB_FIELD; | |
504 | ||
f6970ad3 NB |
505 | sg = &cmd->t_data_sg[0]; |
506 | ||
507 | if (cmd->t_data_nents > 1 || | |
508 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
509 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
510 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
511 | cmd->se_dev->dev_attrib.block_size); | |
512 | return TCM_INVALID_CDB_FIELD; | |
513 | } | |
514 | ||
2237498f NB |
515 | if (bdev_write_zeroes_sectors(bdev)) { |
516 | if (!iblock_execute_zero_out(bdev, cmd)) | |
517 | return 0; | |
518 | } | |
07b63196 | 519 | |
f6970ad3 NB |
520 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
521 | if (!ibr) | |
522 | goto fail; | |
523 | cmd->priv = ibr; | |
524 | ||
bc9e0e36 | 525 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); |
f6970ad3 NB |
526 | if (!bio) |
527 | goto fail_free_ibr; | |
528 | ||
529 | bio_list_init(&list); | |
530 | bio_list_add(&list, bio); | |
531 | ||
5981c245 | 532 | refcount_set(&ibr->pending, 1); |
f6970ad3 NB |
533 | |
534 | while (sectors) { | |
535 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
536 | != sg->length) { | |
537 | ||
bc9e0e36 | 538 | bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); |
f6970ad3 NB |
539 | if (!bio) |
540 | goto fail_put_bios; | |
541 | ||
5981c245 | 542 | refcount_inc(&ibr->pending); |
f6970ad3 NB |
543 | bio_list_add(&list, bio); |
544 | } | |
545 | ||
546 | /* Always in 512 byte units for Linux/Block */ | |
80b045b3 | 547 | block_lba += sg->length >> SECTOR_SHIFT; |
5676234f | 548 | sectors -= sg->length >> SECTOR_SHIFT; |
f6970ad3 NB |
549 | } |
550 | ||
4e49ea4a | 551 | iblock_submit_bios(&list); |
f6970ad3 NB |
552 | return 0; |
553 | ||
554 | fail_put_bios: | |
555 | while ((bio = bio_list_pop(&list))) | |
556 | bio_put(bio); | |
557 | fail_free_ibr: | |
558 | kfree(ibr); | |
559 | fail: | |
560 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
561 | } | |
562 | ||
c66ac9db | 563 | enum { |
44bfd018 | 564 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
565 | }; |
566 | ||
567 | static match_table_t tokens = { | |
568 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 569 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
570 | {Opt_force, "force=%d"}, |
571 | {Opt_err, NULL} | |
572 | }; | |
573 | ||
0fd97ccf CH |
574 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
575 | const char *page, ssize_t count) | |
c66ac9db | 576 | { |
0fd97ccf | 577 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 578 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 579 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 580 | int ret = 0, token; |
44bfd018 | 581 | unsigned long tmp_readonly; |
c66ac9db NB |
582 | |
583 | opts = kstrdup(page, GFP_KERNEL); | |
584 | if (!opts) | |
585 | return -ENOMEM; | |
586 | ||
587 | orig = opts; | |
588 | ||
90c161b6 | 589 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
590 | if (!*ptr) |
591 | continue; | |
592 | ||
593 | token = match_token(ptr, tokens, args); | |
594 | switch (token) { | |
595 | case Opt_udev_path: | |
596 | if (ib_dev->ibd_bd) { | |
6708bb27 | 597 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
598 | " ib_dev->ibd_bd exists\n"); |
599 | ret = -EEXIST; | |
600 | goto out; | |
601 | } | |
852b6ed1 NB |
602 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
603 | SE_UDEV_PATH_LEN) == 0) { | |
604 | ret = -EINVAL; | |
6d180253 JJ |
605 | break; |
606 | } | |
6708bb27 | 607 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
608 | ib_dev->ibd_udev_path); |
609 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
610 | break; | |
44bfd018 AG |
611 | case Opt_readonly: |
612 | arg_p = match_strdup(&args[0]); | |
613 | if (!arg_p) { | |
614 | ret = -ENOMEM; | |
615 | break; | |
616 | } | |
57103d7f | 617 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
44bfd018 AG |
618 | kfree(arg_p); |
619 | if (ret < 0) { | |
57103d7f | 620 | pr_err("kstrtoul() failed for" |
44bfd018 AG |
621 | " readonly=\n"); |
622 | goto out; | |
623 | } | |
624 | ib_dev->ibd_readonly = tmp_readonly; | |
625 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
626 | break; | |
c66ac9db | 627 | case Opt_force: |
c66ac9db NB |
628 | break; |
629 | default: | |
630 | break; | |
631 | } | |
632 | } | |
633 | ||
634 | out: | |
635 | kfree(orig); | |
636 | return (!ret) ? count : ret; | |
637 | } | |
638 | ||
0fd97ccf | 639 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 640 | { |
0fd97ccf CH |
641 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
642 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
643 | ssize_t bl = 0; |
644 | ||
645 | if (bd) | |
1b74ab77 | 646 | bl += sprintf(b + bl, "iBlock device: %pg", bd); |
0fd97ccf | 647 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 648 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
649 | ib_dev->ibd_udev_path); |
650 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
651 | |
652 | bl += sprintf(b + bl, " "); | |
653 | if (bd) { | |
654 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
57ba1059 CH |
655 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), |
656 | "CLAIMED: IBLOCK"); | |
c66ac9db | 657 | } else { |
21bca31c | 658 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
659 | } |
660 | ||
661 | return bl; | |
662 | } | |
663 | ||
ecebbf6c | 664 | static int |
fed564f6 GE |
665 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, |
666 | struct sg_mapping_iter *miter) | |
ecebbf6c NB |
667 | { |
668 | struct se_device *dev = cmd->se_dev; | |
669 | struct blk_integrity *bi; | |
670 | struct bio_integrity_payload *bip; | |
671 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
fed564f6 GE |
672 | int rc; |
673 | size_t resid, len; | |
ecebbf6c NB |
674 | |
675 | bi = bdev_get_integrity(ib_dev->ibd_bd); | |
676 | if (!bi) { | |
677 | pr_err("Unable to locate bio_integrity\n"); | |
678 | return -ENODEV; | |
679 | } | |
680 | ||
5f7136db | 681 | bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); |
06c1e390 | 682 | if (IS_ERR(bip)) { |
ecebbf6c | 683 | pr_err("Unable to allocate bio_integrity_payload\n"); |
06c1e390 | 684 | return PTR_ERR(bip); |
ecebbf6c NB |
685 | } |
686 | ||
fed564f6 | 687 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); |
e4dc9a4c IR |
688 | /* virtual start sector must be in integrity interval units */ |
689 | bip_set_seed(bip, bio->bi_iter.bi_sector >> | |
690 | (bi->interval_exp - SECTOR_SHIFT)); | |
ecebbf6c | 691 | |
4e13c5d0 LT |
692 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
693 | (unsigned long long)bip->bip_iter.bi_sector); | |
ecebbf6c | 694 | |
fed564f6 GE |
695 | resid = bip->bip_iter.bi_size; |
696 | while (resid > 0 && sg_miter_next(miter)) { | |
ecebbf6c | 697 | |
fed564f6 GE |
698 | len = min_t(size_t, miter->length, resid); |
699 | rc = bio_integrity_add_page(bio, miter->page, len, | |
700 | offset_in_page(miter->addr)); | |
701 | if (rc != len) { | |
ecebbf6c | 702 | pr_err("bio_integrity_add_page() failed; %d\n", rc); |
fed564f6 | 703 | sg_miter_stop(miter); |
ecebbf6c NB |
704 | return -ENOMEM; |
705 | } | |
706 | ||
fed564f6 GE |
707 | pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", |
708 | miter->page, len, offset_in_page(miter->addr)); | |
709 | ||
710 | resid -= len; | |
711 | if (len < miter->length) | |
712 | miter->consumed -= miter->length - len; | |
ecebbf6c | 713 | } |
fed564f6 | 714 | sg_miter_stop(miter); |
ecebbf6c NB |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
de103c93 | 719 | static sense_reason_t |
a82a9538 NB |
720 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
721 | enum dma_data_direction data_direction) | |
c66ac9db | 722 | { |
5951146d | 723 | struct se_device *dev = cmd->se_dev; |
8a9ebe71 | 724 | sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
5787cacd | 725 | struct iblock_req *ibr; |
fed564f6 | 726 | struct bio *bio; |
dbbf3e94 | 727 | struct bio_list list; |
c66ac9db | 728 | struct scatterlist *sg; |
5787cacd | 729 | u32 sg_num = sgl_nents; |
79fe9d7d | 730 | blk_opf_t opf; |
d5b4a21b | 731 | unsigned bio_cnt; |
bc9e0e36 | 732 | int i, rc; |
fed564f6 | 733 | struct sg_mapping_iter prot_miter; |
bc9e0e36 | 734 | unsigned int miter_dir; |
dbbf3e94 | 735 | |
5787cacd | 736 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 | 737 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
dbbf3e94 | 738 | /* |
70fd7614 | 739 | * Force writethrough using REQ_FUA if a volatile write cache |
d0c8b259 | 740 | * is not enabled, or if initiator set the Force Unit Access bit. |
dbbf3e94 | 741 | */ |
bc9e0e36 CK |
742 | opf = REQ_OP_WRITE; |
743 | miter_dir = SG_MITER_TO_SG; | |
a557e82e | 744 | if (bdev_fua(ib_dev->ibd_bd)) { |
d0c8b259 | 745 | if (cmd->se_cmd_flags & SCF_FUA) |
bc9e0e36 | 746 | opf |= REQ_FUA; |
08e688fd | 747 | else if (!bdev_write_cache(ib_dev->ibd_bd)) |
bc9e0e36 | 748 | opf |= REQ_FUA; |
d0c8b259 | 749 | } |
dbbf3e94 | 750 | } else { |
bc9e0e36 CK |
751 | opf = REQ_OP_READ; |
752 | miter_dir = SG_MITER_FROM_SG; | |
dbbf3e94 CH |
753 | } |
754 | ||
5787cacd CH |
755 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
756 | if (!ibr) | |
757 | goto fail; | |
758 | cmd->priv = ibr; | |
759 | ||
e0de4457 | 760 | if (!sgl_nents) { |
5981c245 | 761 | refcount_set(&ibr->pending, 1); |
e0de4457 PB |
762 | iblock_complete_cmd(cmd); |
763 | return 0; | |
764 | } | |
765 | ||
bc9e0e36 | 766 | bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); |
5787cacd CH |
767 | if (!bio) |
768 | goto fail_free_ibr; | |
dbbf3e94 CH |
769 | |
770 | bio_list_init(&list); | |
771 | bio_list_add(&list, bio); | |
5787cacd | 772 | |
5981c245 | 773 | refcount_set(&ibr->pending, 2); |
d5b4a21b | 774 | bio_cnt = 1; |
c66ac9db | 775 | |
fed564f6 GE |
776 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) |
777 | sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, | |
bc9e0e36 | 778 | miter_dir); |
fed564f6 | 779 | |
5787cacd | 780 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
781 | /* |
782 | * XXX: if the length the device accepts is shorter than the | |
783 | * length of the S/G list entry this will cause and | |
784 | * endless loop. Better hope no driver uses huge pages. | |
785 | */ | |
786 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
787 | != sg->length) { | |
fed564f6 GE |
788 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
789 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); | |
790 | if (rc) | |
791 | goto fail_put_bios; | |
792 | } | |
793 | ||
d5b4a21b | 794 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
4e49ea4a | 795 | iblock_submit_bios(&list); |
d5b4a21b CH |
796 | bio_cnt = 0; |
797 | } | |
798 | ||
bc9e0e36 | 799 | bio = iblock_get_bio(cmd, block_lba, sg_num, opf); |
6708bb27 | 800 | if (!bio) |
5787cacd CH |
801 | goto fail_put_bios; |
802 | ||
5981c245 | 803 | refcount_inc(&ibr->pending); |
dbbf3e94 | 804 | bio_list_add(&list, bio); |
d5b4a21b | 805 | bio_cnt++; |
c66ac9db | 806 | } |
dbbf3e94 | 807 | |
c66ac9db | 808 | /* Always in 512 byte units for Linux/Block */ |
80b045b3 | 809 | block_lba += sg->length >> SECTOR_SHIFT; |
c66ac9db | 810 | sg_num--; |
c66ac9db NB |
811 | } |
812 | ||
6f16ec43 | 813 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
fed564f6 | 814 | rc = iblock_alloc_bip(cmd, bio, &prot_miter); |
ecebbf6c NB |
815 | if (rc) |
816 | goto fail_put_bios; | |
817 | } | |
818 | ||
4e49ea4a | 819 | iblock_submit_bios(&list); |
5787cacd | 820 | iblock_complete_cmd(cmd); |
03e98c9e | 821 | return 0; |
dbbf3e94 | 822 | |
5787cacd | 823 | fail_put_bios: |
dbbf3e94 | 824 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 825 | bio_put(bio); |
5787cacd CH |
826 | fail_free_ibr: |
827 | kfree(ibr); | |
5787cacd | 828 | fail: |
de103c93 | 829 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
830 | } |
831 | ||
7f7caf6a AG |
832 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
833 | { | |
834 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
835 | struct block_device *bd = ib_dev->ibd_bd; | |
836 | int ret; | |
837 | ||
838 | ret = bdev_alignment_offset(bd); | |
839 | if (ret == -1) | |
840 | return 0; | |
841 | ||
842 | /* convert offset-bytes to offset-lbas */ | |
843 | return ret / bdev_logical_block_size(bd); | |
844 | } | |
845 | ||
846 | static unsigned int iblock_get_lbppbe(struct se_device *dev) | |
847 | { | |
848 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
849 | struct block_device *bd = ib_dev->ibd_bd; | |
c151eddb | 850 | unsigned int logs_per_phys = |
a2c6c6a3 | 851 | bdev_physical_block_size(bd) / bdev_logical_block_size(bd); |
7f7caf6a AG |
852 | |
853 | return ilog2(logs_per_phys); | |
854 | } | |
855 | ||
856 | static unsigned int iblock_get_io_min(struct se_device *dev) | |
857 | { | |
858 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
859 | struct block_device *bd = ib_dev->ibd_bd; | |
860 | ||
861 | return bdev_io_min(bd); | |
862 | } | |
863 | ||
864 | static unsigned int iblock_get_io_opt(struct se_device *dev) | |
865 | { | |
866 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
867 | struct block_device *bd = ib_dev->ibd_bd; | |
868 | ||
869 | return bdev_io_opt(bd); | |
870 | } | |
871 | ||
9e999a6c | 872 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 873 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 874 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 875 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 876 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
877 | }; |
878 | ||
de103c93 CH |
879 | static sense_reason_t |
880 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 881 | { |
9e999a6c | 882 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
883 | } |
884 | ||
452e2010 | 885 | static bool iblock_get_write_cache(struct se_device *dev) |
d0c8b259 | 886 | { |
08e688fd | 887 | return bdev_write_cache(IBLOCK_DEV(dev)->ibd_bd); |
d0c8b259 NB |
888 | } |
889 | ||
0a06d430 | 890 | static const struct target_backend_ops iblock_ops = { |
c66ac9db | 891 | .name = "iblock", |
0fd97ccf CH |
892 | .inquiry_prod = "IBLOCK", |
893 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db | 894 | .owner = THIS_MODULE, |
c66ac9db NB |
895 | .attach_hba = iblock_attach_hba, |
896 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
897 | .alloc_device = iblock_alloc_device, |
898 | .configure_device = iblock_configure_device, | |
92634706 | 899 | .destroy_device = iblock_destroy_device, |
c66ac9db | 900 | .free_device = iblock_free_device, |
d7c382c5 | 901 | .configure_unmap = iblock_configure_unmap, |
415ccd98 MC |
902 | .plug_device = iblock_plug_device, |
903 | .unplug_device = iblock_unplug_device, | |
0c2ad7d1 | 904 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
905 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
906 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 907 | .get_device_type = sbc_get_device_type, |
c66ac9db | 908 | .get_blocks = iblock_get_blocks, |
7f7caf6a AG |
909 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
910 | .get_lbppbe = iblock_get_lbppbe, | |
911 | .get_io_min = iblock_get_io_min, | |
912 | .get_io_opt = iblock_get_io_opt, | |
d0c8b259 | 913 | .get_write_cache = iblock_get_write_cache, |
5873c4d1 | 914 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
915 | }; |
916 | ||
917 | static int __init iblock_module_init(void) | |
918 | { | |
0a06d430 | 919 | return transport_backend_register(&iblock_ops); |
c66ac9db NB |
920 | } |
921 | ||
63b91d5a | 922 | static void __exit iblock_module_exit(void) |
c66ac9db | 923 | { |
0a06d430 | 924 | target_backend_unregister(&iblock_ops); |
c66ac9db NB |
925 | } |
926 | ||
927 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
928 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
929 | MODULE_LICENSE("GPL"); | |
930 | ||
931 | module_init(iblock_module_init); | |
932 | module_exit(iblock_module_exit); |