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Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_iblock.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> Linux BlockIO transport | |
5 | * specific functions. | |
6 | * | |
fd9a11d7 | 7 | * (c) Copyright 2003-2012 RisingTide Systems LLC. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
c66ac9db NB |
27 | #include <linux/string.h> |
28 | #include <linux/parser.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
c66ac9db NB |
34 | #include <linux/bio.h> |
35 | #include <linux/genhd.h> | |
36 | #include <linux/file.h> | |
827509e3 | 37 | #include <linux/module.h> |
c66ac9db NB |
38 | #include <scsi/scsi.h> |
39 | #include <scsi/scsi_host.h> | |
14150a6b | 40 | #include <asm/unaligned.h> |
c66ac9db NB |
41 | |
42 | #include <target/target_core_base.h> | |
c4795fb2 | 43 | #include <target/target_core_backend.h> |
c66ac9db NB |
44 | |
45 | #include "target_core_iblock.h" | |
46 | ||
d5b4a21b CH |
47 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
48 | #define IBLOCK_BIO_POOL_SIZE 128 | |
49 | ||
0fd97ccf CH |
50 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
51 | { | |
52 | return container_of(dev, struct iblock_dev, dev); | |
53 | } | |
54 | ||
55 | ||
c66ac9db NB |
56 | static struct se_subsystem_api iblock_template; |
57 | ||
c66ac9db NB |
58 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
59 | * | |
60 | * | |
61 | */ | |
62 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
63 | { | |
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
65 | " Generic Target Core Stack %s\n", hba->hba_id, |
66 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
67 | return 0; |
68 | } | |
69 | ||
70 | static void iblock_detach_hba(struct se_hba *hba) | |
71 | { | |
c66ac9db NB |
72 | } |
73 | ||
0fd97ccf | 74 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
75 | { |
76 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
77 | |
78 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
79 | if (!ib_dev) { |
80 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
81 | return NULL; |
82 | } | |
c66ac9db | 83 | |
6708bb27 | 84 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 85 | |
0fd97ccf | 86 | return &ib_dev->dev; |
c66ac9db NB |
87 | } |
88 | ||
0fd97ccf | 89 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 90 | { |
0fd97ccf | 91 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 92 | struct request_queue *q; |
0fd97ccf | 93 | struct block_device *bd = NULL; |
44bfd018 | 94 | fmode_t mode; |
0fd97ccf | 95 | int ret = -ENOMEM; |
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 CH |
101 | |
102 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 103 | if (!ib_dev->ibd_bio_set) { |
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; | |
114 | ||
115 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
116 | if (IS_ERR(bd)) { |
117 | ret = PTR_ERR(bd); | |
0fd97ccf | 118 | goto out_free_bioset; |
613640e4 | 119 | } |
c66ac9db NB |
120 | ib_dev->ibd_bd = bd; |
121 | ||
0fd97ccf CH |
122 | q = bdev_get_queue(bd); |
123 | ||
124 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
125 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
126 | dev->dev_attrib.hw_queue_depth = q->nr_requests; | |
c66ac9db | 127 | |
c66ac9db NB |
128 | /* |
129 | * Check if the underlying struct block_device request_queue supports | |
130 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
131 | * in ATA and we need to set TPE=1 | |
132 | */ | |
613640e4 | 133 | if (blk_queue_discard(q)) { |
0fd97ccf | 134 | dev->dev_attrib.max_unmap_lba_count = |
c66ac9db | 135 | q->limits.max_discard_sectors; |
0fd97ccf | 136 | |
c66ac9db NB |
137 | /* |
138 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
139 | */ | |
0fd97ccf CH |
140 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
141 | dev->dev_attrib.unmap_granularity = | |
7347b5ff | 142 | q->limits.discard_granularity >> 9; |
0fd97ccf | 143 | dev->dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
144 | q->limits.discard_alignment; |
145 | ||
6708bb27 | 146 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
147 | " disabled by default\n"); |
148 | } | |
f6970ad3 NB |
149 | /* |
150 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
151 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
152 | */ | |
153 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
c66ac9db | 154 | |
e22a7f07 | 155 | if (blk_queue_nonrot(q)) |
0fd97ccf CH |
156 | dev->dev_attrib.is_nonrot = 1; |
157 | return 0; | |
c66ac9db | 158 | |
0fd97ccf CH |
159 | out_free_bioset: |
160 | bioset_free(ib_dev->ibd_bio_set); | |
161 | ib_dev->ibd_bio_set = NULL; | |
162 | out: | |
163 | return ret; | |
c66ac9db NB |
164 | } |
165 | ||
0fd97ccf | 166 | static void iblock_free_device(struct se_device *dev) |
c66ac9db | 167 | { |
0fd97ccf | 168 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 169 | |
bc665524 NB |
170 | if (ib_dev->ibd_bd != NULL) |
171 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
172 | if (ib_dev->ibd_bio_set != NULL) | |
173 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
174 | kfree(ib_dev); |
175 | } | |
176 | ||
c66ac9db NB |
177 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
178 | struct se_device *dev, | |
179 | struct block_device *bd, | |
180 | struct request_queue *q) | |
181 | { | |
182 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
183 | bdev_logical_block_size(bd)) - 1); | |
184 | u32 block_size = bdev_logical_block_size(bd); | |
185 | ||
0fd97ccf | 186 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
187 | return blocks_long; |
188 | ||
189 | switch (block_size) { | |
190 | case 4096: | |
0fd97ccf | 191 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
192 | case 2048: |
193 | blocks_long <<= 1; | |
194 | break; | |
195 | case 1024: | |
196 | blocks_long <<= 2; | |
197 | break; | |
198 | case 512: | |
199 | blocks_long <<= 3; | |
200 | default: | |
201 | break; | |
202 | } | |
203 | break; | |
204 | case 2048: | |
0fd97ccf | 205 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
206 | case 4096: |
207 | blocks_long >>= 1; | |
208 | break; | |
209 | case 1024: | |
210 | blocks_long <<= 1; | |
211 | break; | |
212 | case 512: | |
213 | blocks_long <<= 2; | |
214 | break; | |
215 | default: | |
216 | break; | |
217 | } | |
218 | break; | |
219 | case 1024: | |
0fd97ccf | 220 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
221 | case 4096: |
222 | blocks_long >>= 2; | |
223 | break; | |
224 | case 2048: | |
225 | blocks_long >>= 1; | |
226 | break; | |
227 | case 512: | |
228 | blocks_long <<= 1; | |
229 | break; | |
230 | default: | |
231 | break; | |
232 | } | |
233 | break; | |
234 | case 512: | |
0fd97ccf | 235 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
236 | case 4096: |
237 | blocks_long >>= 3; | |
238 | break; | |
239 | case 2048: | |
240 | blocks_long >>= 2; | |
241 | break; | |
242 | case 1024: | |
243 | blocks_long >>= 1; | |
244 | break; | |
245 | default: | |
246 | break; | |
247 | } | |
248 | break; | |
249 | default: | |
250 | break; | |
251 | } | |
252 | ||
253 | return blocks_long; | |
254 | } | |
255 | ||
3a41d85f NB |
256 | static void iblock_complete_cmd(struct se_cmd *cmd) |
257 | { | |
258 | struct iblock_req *ibr = cmd->priv; | |
259 | u8 status; | |
260 | ||
261 | if (!atomic_dec_and_test(&ibr->pending)) | |
262 | return; | |
263 | ||
264 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
265 | status = SAM_STAT_CHECK_CONDITION; | |
266 | else | |
267 | status = SAM_STAT_GOOD; | |
268 | ||
269 | target_complete_cmd(cmd, status); | |
270 | kfree(ibr); | |
271 | } | |
272 | ||
273 | static void iblock_bio_done(struct bio *bio, int err) | |
274 | { | |
275 | struct se_cmd *cmd = bio->bi_private; | |
276 | struct iblock_req *ibr = cmd->priv; | |
277 | ||
278 | /* | |
279 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
280 | */ | |
281 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) | |
282 | err = -EIO; | |
283 | ||
284 | if (err != 0) { | |
285 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," | |
286 | " err: %d\n", bio, err); | |
287 | /* | |
288 | * Bump the ib_bio_err_cnt and release bio. | |
289 | */ | |
290 | atomic_inc(&ibr->ib_bio_err_cnt); | |
291 | smp_mb__after_atomic_inc(); | |
292 | } | |
293 | ||
294 | bio_put(bio); | |
295 | ||
296 | iblock_complete_cmd(cmd); | |
297 | } | |
298 | ||
299 | static struct bio * | |
300 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
301 | { | |
302 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
303 | struct bio *bio; | |
304 | ||
305 | /* | |
306 | * Only allocate as many vector entries as the bio code allows us to, | |
307 | * we'll loop later on until we have handled the whole request. | |
308 | */ | |
309 | if (sg_num > BIO_MAX_PAGES) | |
310 | sg_num = BIO_MAX_PAGES; | |
311 | ||
312 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
313 | if (!bio) { | |
314 | pr_err("Unable to allocate memory for bio\n"); | |
315 | return NULL; | |
316 | } | |
317 | ||
318 | bio->bi_bdev = ib_dev->ibd_bd; | |
319 | bio->bi_private = cmd; | |
320 | bio->bi_end_io = &iblock_bio_done; | |
321 | bio->bi_sector = lba; | |
322 | ||
323 | return bio; | |
324 | } | |
325 | ||
326 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
327 | { | |
328 | struct blk_plug plug; | |
329 | struct bio *bio; | |
330 | ||
331 | blk_start_plug(&plug); | |
332 | while ((bio = bio_list_pop(list))) | |
333 | submit_bio(rw, bio); | |
334 | blk_finish_plug(&plug); | |
335 | } | |
336 | ||
df5fa691 CH |
337 | static void iblock_end_io_flush(struct bio *bio, int err) |
338 | { | |
339 | struct se_cmd *cmd = bio->bi_private; | |
340 | ||
341 | if (err) | |
342 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
343 | ||
5787cacd | 344 | if (cmd) { |
de103c93 | 345 | if (err) |
5787cacd | 346 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 347 | else |
5787cacd | 348 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
349 | } |
350 | ||
df5fa691 CH |
351 | bio_put(bio); |
352 | } | |
353 | ||
c66ac9db | 354 | /* |
df5fa691 CH |
355 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
356 | * always flush the whole cache. | |
c66ac9db | 357 | */ |
de103c93 CH |
358 | static sense_reason_t |
359 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 360 | { |
0fd97ccf | 361 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 362 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 363 | struct bio *bio; |
c66ac9db NB |
364 | |
365 | /* | |
366 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 367 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
368 | */ |
369 | if (immed) | |
5787cacd | 370 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 371 | |
df5fa691 CH |
372 | bio = bio_alloc(GFP_KERNEL, 0); |
373 | bio->bi_end_io = iblock_end_io_flush; | |
374 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 375 | if (!immed) |
df5fa691 CH |
376 | bio->bi_private = cmd; |
377 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 378 | return 0; |
c66ac9db NB |
379 | } |
380 | ||
de103c93 CH |
381 | static sense_reason_t |
382 | iblock_execute_unmap(struct se_cmd *cmd) | |
c66ac9db | 383 | { |
14150a6b | 384 | struct se_device *dev = cmd->se_dev; |
0fd97ccf | 385 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
14150a6b | 386 | unsigned char *buf, *ptr = NULL; |
14150a6b | 387 | sector_t lba; |
0d7f1299 | 388 | int size; |
b7fc7f37 | 389 | u32 range; |
de103c93 CH |
390 | sense_reason_t ret = 0; |
391 | int dl, bd_dl, err; | |
14150a6b | 392 | |
0d7f1299 PB |
393 | if (cmd->data_length < 8) { |
394 | pr_warn("UNMAP parameter list length %u too small\n", | |
395 | cmd->data_length); | |
de103c93 | 396 | return TCM_INVALID_PARAMETER_LIST; |
0d7f1299 PB |
397 | } |
398 | ||
14150a6b | 399 | buf = transport_kmap_data_sg(cmd); |
de103c93 CH |
400 | if (!buf) |
401 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
14150a6b | 402 | |
1a5fa457 RD |
403 | dl = get_unaligned_be16(&buf[0]); |
404 | bd_dl = get_unaligned_be16(&buf[2]); | |
405 | ||
0d7f1299 PB |
406 | size = cmd->data_length - 8; |
407 | if (bd_dl > size) | |
408 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
409 | cmd->data_length, bd_dl); | |
410 | else | |
411 | size = bd_dl; | |
412 | ||
0fd97ccf | 413 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
de103c93 | 414 | ret = TCM_INVALID_PARAMETER_LIST; |
7409a665 RD |
415 | goto err; |
416 | } | |
b7fc7f37 RD |
417 | |
418 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
419 | ptr = &buf[8]; | |
420 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
14150a6b CH |
421 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
422 | ||
b7fc7f37 | 423 | while (size >= 16) { |
14150a6b CH |
424 | lba = get_unaligned_be64(&ptr[0]); |
425 | range = get_unaligned_be32(&ptr[8]); | |
426 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
427 | (unsigned long long)lba, range); | |
428 | ||
0fd97ccf | 429 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
de103c93 | 430 | ret = TCM_INVALID_PARAMETER_LIST; |
2594e298 RD |
431 | goto err; |
432 | } | |
433 | ||
434 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
de103c93 | 435 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
2594e298 RD |
436 | goto err; |
437 | } | |
438 | ||
de103c93 | 439 | err = blkdev_issue_discard(ib_dev->ibd_bd, lba, range, |
14150a6b | 440 | GFP_KERNEL, 0); |
de103c93 | 441 | if (err < 0) { |
14150a6b | 442 | pr_err("blkdev_issue_discard() failed: %d\n", |
de103c93 CH |
443 | err); |
444 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
14150a6b CH |
445 | goto err; |
446 | } | |
447 | ||
448 | ptr += 16; | |
449 | size -= 16; | |
450 | } | |
c66ac9db | 451 | |
14150a6b CH |
452 | err: |
453 | transport_kunmap_data_sg(cmd); | |
454 | if (!ret) | |
455 | target_complete_cmd(cmd, GOOD); | |
456 | return ret; | |
c66ac9db NB |
457 | } |
458 | ||
de103c93 | 459 | static sense_reason_t |
f6970ad3 | 460 | iblock_execute_write_same_unmap(struct se_cmd *cmd) |
6f974e8c | 461 | { |
0fd97ccf | 462 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
f6970ad3 | 463 | int rc; |
6f974e8c | 464 | |
f6970ad3 NB |
465 | rc = blkdev_issue_discard(ib_dev->ibd_bd, cmd->t_task_lba, |
466 | spc_get_write_same_sectors(cmd), GFP_KERNEL, 0); | |
467 | if (rc < 0) { | |
468 | pr_warn("blkdev_issue_discard() failed: %d\n", rc); | |
de103c93 | 469 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
6f974e8c CH |
470 | } |
471 | ||
472 | target_complete_cmd(cmd, GOOD); | |
473 | return 0; | |
474 | } | |
475 | ||
f6970ad3 NB |
476 | static sense_reason_t |
477 | iblock_execute_write_same(struct se_cmd *cmd) | |
478 | { | |
479 | struct iblock_req *ibr; | |
480 | struct scatterlist *sg; | |
481 | struct bio *bio; | |
482 | struct bio_list list; | |
483 | sector_t block_lba = cmd->t_task_lba; | |
ffe00675 | 484 | sector_t sectors = spc_get_write_same_sectors(cmd); |
f6970ad3 NB |
485 | |
486 | sg = &cmd->t_data_sg[0]; | |
487 | ||
488 | if (cmd->t_data_nents > 1 || | |
489 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
490 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
491 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
492 | cmd->se_dev->dev_attrib.block_size); | |
493 | return TCM_INVALID_CDB_FIELD; | |
494 | } | |
495 | ||
496 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
497 | if (!ibr) | |
498 | goto fail; | |
499 | cmd->priv = ibr; | |
500 | ||
501 | bio = iblock_get_bio(cmd, block_lba, 1); | |
502 | if (!bio) | |
503 | goto fail_free_ibr; | |
504 | ||
505 | bio_list_init(&list); | |
506 | bio_list_add(&list, bio); | |
507 | ||
508 | atomic_set(&ibr->pending, 1); | |
509 | ||
510 | while (sectors) { | |
511 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
512 | != sg->length) { | |
513 | ||
514 | bio = iblock_get_bio(cmd, block_lba, 1); | |
515 | if (!bio) | |
516 | goto fail_put_bios; | |
517 | ||
518 | atomic_inc(&ibr->pending); | |
519 | bio_list_add(&list, bio); | |
520 | } | |
521 | ||
522 | /* Always in 512 byte units for Linux/Block */ | |
523 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
524 | sectors -= 1; | |
525 | } | |
526 | ||
527 | iblock_submit_bios(&list, WRITE); | |
528 | return 0; | |
529 | ||
530 | fail_put_bios: | |
531 | while ((bio = bio_list_pop(&list))) | |
532 | bio_put(bio); | |
533 | fail_free_ibr: | |
534 | kfree(ibr); | |
535 | fail: | |
536 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
537 | } | |
538 | ||
c66ac9db | 539 | enum { |
44bfd018 | 540 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
541 | }; |
542 | ||
543 | static match_table_t tokens = { | |
544 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 545 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
546 | {Opt_force, "force=%d"}, |
547 | {Opt_err, NULL} | |
548 | }; | |
549 | ||
0fd97ccf CH |
550 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
551 | const char *page, ssize_t count) | |
c66ac9db | 552 | { |
0fd97ccf | 553 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 554 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 555 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 556 | int ret = 0, token; |
44bfd018 | 557 | unsigned long tmp_readonly; |
c66ac9db NB |
558 | |
559 | opts = kstrdup(page, GFP_KERNEL); | |
560 | if (!opts) | |
561 | return -ENOMEM; | |
562 | ||
563 | orig = opts; | |
564 | ||
90c161b6 | 565 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
566 | if (!*ptr) |
567 | continue; | |
568 | ||
569 | token = match_token(ptr, tokens, args); | |
570 | switch (token) { | |
571 | case Opt_udev_path: | |
572 | if (ib_dev->ibd_bd) { | |
6708bb27 | 573 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
574 | " ib_dev->ibd_bd exists\n"); |
575 | ret = -EEXIST; | |
576 | goto out; | |
577 | } | |
852b6ed1 NB |
578 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
579 | SE_UDEV_PATH_LEN) == 0) { | |
580 | ret = -EINVAL; | |
6d180253 JJ |
581 | break; |
582 | } | |
6708bb27 | 583 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
584 | ib_dev->ibd_udev_path); |
585 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
586 | break; | |
44bfd018 AG |
587 | case Opt_readonly: |
588 | arg_p = match_strdup(&args[0]); | |
589 | if (!arg_p) { | |
590 | ret = -ENOMEM; | |
591 | break; | |
592 | } | |
593 | ret = strict_strtoul(arg_p, 0, &tmp_readonly); | |
594 | kfree(arg_p); | |
595 | if (ret < 0) { | |
596 | pr_err("strict_strtoul() failed for" | |
597 | " readonly=\n"); | |
598 | goto out; | |
599 | } | |
600 | ib_dev->ibd_readonly = tmp_readonly; | |
601 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
602 | break; | |
c66ac9db | 603 | case Opt_force: |
c66ac9db NB |
604 | break; |
605 | default: | |
606 | break; | |
607 | } | |
608 | } | |
609 | ||
610 | out: | |
611 | kfree(orig); | |
612 | return (!ret) ? count : ret; | |
613 | } | |
614 | ||
0fd97ccf | 615 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 616 | { |
0fd97ccf CH |
617 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
618 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
619 | char buf[BDEVNAME_SIZE]; |
620 | ssize_t bl = 0; | |
621 | ||
622 | if (bd) | |
623 | bl += sprintf(b + bl, "iBlock device: %s", | |
624 | bdevname(bd, buf)); | |
0fd97ccf | 625 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 626 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
627 | ib_dev->ibd_udev_path); |
628 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
629 | |
630 | bl += sprintf(b + bl, " "); | |
631 | if (bd) { | |
632 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 633 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 634 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
635 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
636 | } else { | |
21bca31c | 637 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
638 | } |
639 | ||
640 | return bl; | |
641 | } | |
642 | ||
de103c93 CH |
643 | static sense_reason_t |
644 | iblock_execute_rw(struct se_cmd *cmd) | |
c66ac9db | 645 | { |
0c2ad7d1 CH |
646 | struct scatterlist *sgl = cmd->t_data_sg; |
647 | u32 sgl_nents = cmd->t_data_nents; | |
648 | enum dma_data_direction data_direction = cmd->data_direction; | |
5951146d | 649 | struct se_device *dev = cmd->se_dev; |
5787cacd | 650 | struct iblock_req *ibr; |
dbbf3e94 CH |
651 | struct bio *bio; |
652 | struct bio_list list; | |
c66ac9db | 653 | struct scatterlist *sg; |
5787cacd | 654 | u32 sg_num = sgl_nents; |
c66ac9db | 655 | sector_t block_lba; |
d5b4a21b | 656 | unsigned bio_cnt; |
dbbf3e94 | 657 | int rw; |
5787cacd | 658 | int i; |
dbbf3e94 | 659 | |
5787cacd | 660 | if (data_direction == DMA_TO_DEVICE) { |
dbbf3e94 CH |
661 | /* |
662 | * Force data to disk if we pretend to not have a volatile | |
663 | * write cache, or the initiator set the Force Unit Access bit. | |
664 | */ | |
0fd97ccf CH |
665 | if (dev->dev_attrib.emulate_write_cache == 0 || |
666 | (dev->dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 667 | (cmd->se_cmd_flags & SCF_FUA))) |
dbbf3e94 CH |
668 | rw = WRITE_FUA; |
669 | else | |
670 | rw = WRITE; | |
671 | } else { | |
672 | rw = READ; | |
673 | } | |
674 | ||
c66ac9db | 675 | /* |
5787cacd CH |
676 | * Convert the blocksize advertised to the initiator to the 512 byte |
677 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 678 | */ |
0fd97ccf | 679 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 680 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 681 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 682 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 683 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 684 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 685 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 686 | block_lba = cmd->t_task_lba; |
c66ac9db | 687 | else { |
6708bb27 | 688 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 689 | " %u\n", dev->dev_attrib.block_size); |
de103c93 | 690 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
691 | } |
692 | ||
5787cacd CH |
693 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
694 | if (!ibr) | |
695 | goto fail; | |
696 | cmd->priv = ibr; | |
697 | ||
e0de4457 PB |
698 | if (!sgl_nents) { |
699 | atomic_set(&ibr->pending, 1); | |
700 | iblock_complete_cmd(cmd); | |
701 | return 0; | |
702 | } | |
703 | ||
5787cacd CH |
704 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
705 | if (!bio) | |
706 | goto fail_free_ibr; | |
dbbf3e94 CH |
707 | |
708 | bio_list_init(&list); | |
709 | bio_list_add(&list, bio); | |
5787cacd CH |
710 | |
711 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 712 | bio_cnt = 1; |
c66ac9db | 713 | |
5787cacd | 714 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
715 | /* |
716 | * XXX: if the length the device accepts is shorter than the | |
717 | * length of the S/G list entry this will cause and | |
718 | * endless loop. Better hope no driver uses huge pages. | |
719 | */ | |
720 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
721 | != sg->length) { | |
d5b4a21b CH |
722 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
723 | iblock_submit_bios(&list, rw); | |
724 | bio_cnt = 0; | |
725 | } | |
726 | ||
5787cacd | 727 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 728 | if (!bio) |
5787cacd CH |
729 | goto fail_put_bios; |
730 | ||
731 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 732 | bio_list_add(&list, bio); |
d5b4a21b | 733 | bio_cnt++; |
c66ac9db | 734 | } |
dbbf3e94 | 735 | |
c66ac9db NB |
736 | /* Always in 512 byte units for Linux/Block */ |
737 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
738 | sg_num--; | |
c66ac9db NB |
739 | } |
740 | ||
d5b4a21b | 741 | iblock_submit_bios(&list, rw); |
5787cacd | 742 | iblock_complete_cmd(cmd); |
03e98c9e | 743 | return 0; |
dbbf3e94 | 744 | |
5787cacd | 745 | fail_put_bios: |
dbbf3e94 | 746 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 747 | bio_put(bio); |
5787cacd CH |
748 | fail_free_ibr: |
749 | kfree(ibr); | |
5787cacd | 750 | fail: |
de103c93 | 751 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
752 | } |
753 | ||
c66ac9db NB |
754 | static sector_t iblock_get_blocks(struct se_device *dev) |
755 | { | |
0fd97ccf CH |
756 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
757 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
758 | struct request_queue *q = bdev_get_queue(bd); |
759 | ||
760 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
761 | } | |
762 | ||
9e999a6c | 763 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 764 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 765 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 766 | .execute_write_same = iblock_execute_write_same, |
f6970ad3 | 767 | .execute_write_same_unmap = iblock_execute_write_same_unmap, |
14150a6b | 768 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
769 | }; |
770 | ||
de103c93 CH |
771 | static sense_reason_t |
772 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 773 | { |
9e999a6c | 774 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
775 | } |
776 | ||
c66ac9db NB |
777 | static struct se_subsystem_api iblock_template = { |
778 | .name = "iblock", | |
0fd97ccf CH |
779 | .inquiry_prod = "IBLOCK", |
780 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db NB |
781 | .owner = THIS_MODULE, |
782 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
c66ac9db NB |
783 | .attach_hba = iblock_attach_hba, |
784 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
785 | .alloc_device = iblock_alloc_device, |
786 | .configure_device = iblock_configure_device, | |
c66ac9db | 787 | .free_device = iblock_free_device, |
0c2ad7d1 | 788 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
789 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
790 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 791 | .get_device_type = sbc_get_device_type, |
c66ac9db NB |
792 | .get_blocks = iblock_get_blocks, |
793 | }; | |
794 | ||
795 | static int __init iblock_module_init(void) | |
796 | { | |
797 | return transport_subsystem_register(&iblock_template); | |
798 | } | |
799 | ||
800 | static void iblock_module_exit(void) | |
801 | { | |
802 | transport_subsystem_release(&iblock_template); | |
803 | } | |
804 | ||
805 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
806 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
807 | MODULE_LICENSE("GPL"); | |
808 | ||
809 | module_init(iblock_module_init); | |
810 | module_exit(iblock_module_exit); |