Commit | Line | Data |
---|---|---|
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 | 156 | dev->dev_attrib.is_nonrot = 1; |
d0c8b259 | 157 | |
0fd97ccf | 158 | return 0; |
c66ac9db | 159 | |
0fd97ccf CH |
160 | out_free_bioset: |
161 | bioset_free(ib_dev->ibd_bio_set); | |
162 | ib_dev->ibd_bio_set = NULL; | |
163 | out: | |
164 | return ret; | |
c66ac9db NB |
165 | } |
166 | ||
0fd97ccf | 167 | static void iblock_free_device(struct se_device *dev) |
c66ac9db | 168 | { |
0fd97ccf | 169 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 170 | |
bc665524 NB |
171 | if (ib_dev->ibd_bd != NULL) |
172 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
173 | if (ib_dev->ibd_bio_set != NULL) | |
174 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
175 | kfree(ib_dev); |
176 | } | |
177 | ||
c66ac9db NB |
178 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
179 | struct se_device *dev, | |
180 | struct block_device *bd, | |
181 | struct request_queue *q) | |
182 | { | |
183 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
184 | bdev_logical_block_size(bd)) - 1); | |
185 | u32 block_size = bdev_logical_block_size(bd); | |
186 | ||
0fd97ccf | 187 | if (block_size == dev->dev_attrib.block_size) |
c66ac9db NB |
188 | return blocks_long; |
189 | ||
190 | switch (block_size) { | |
191 | case 4096: | |
0fd97ccf | 192 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
193 | case 2048: |
194 | blocks_long <<= 1; | |
195 | break; | |
196 | case 1024: | |
197 | blocks_long <<= 2; | |
198 | break; | |
199 | case 512: | |
200 | blocks_long <<= 3; | |
201 | default: | |
202 | break; | |
203 | } | |
204 | break; | |
205 | case 2048: | |
0fd97ccf | 206 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
207 | case 4096: |
208 | blocks_long >>= 1; | |
209 | break; | |
210 | case 1024: | |
211 | blocks_long <<= 1; | |
212 | break; | |
213 | case 512: | |
214 | blocks_long <<= 2; | |
215 | break; | |
216 | default: | |
217 | break; | |
218 | } | |
219 | break; | |
220 | case 1024: | |
0fd97ccf | 221 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
222 | case 4096: |
223 | blocks_long >>= 2; | |
224 | break; | |
225 | case 2048: | |
226 | blocks_long >>= 1; | |
227 | break; | |
228 | case 512: | |
229 | blocks_long <<= 1; | |
230 | break; | |
231 | default: | |
232 | break; | |
233 | } | |
234 | break; | |
235 | case 512: | |
0fd97ccf | 236 | switch (dev->dev_attrib.block_size) { |
c66ac9db NB |
237 | case 4096: |
238 | blocks_long >>= 3; | |
239 | break; | |
240 | case 2048: | |
241 | blocks_long >>= 2; | |
242 | break; | |
243 | case 1024: | |
244 | blocks_long >>= 1; | |
245 | break; | |
246 | default: | |
247 | break; | |
248 | } | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | ||
254 | return blocks_long; | |
255 | } | |
256 | ||
3a41d85f NB |
257 | static void iblock_complete_cmd(struct se_cmd *cmd) |
258 | { | |
259 | struct iblock_req *ibr = cmd->priv; | |
260 | u8 status; | |
261 | ||
262 | if (!atomic_dec_and_test(&ibr->pending)) | |
263 | return; | |
264 | ||
265 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
266 | status = SAM_STAT_CHECK_CONDITION; | |
267 | else | |
268 | status = SAM_STAT_GOOD; | |
269 | ||
270 | target_complete_cmd(cmd, status); | |
271 | kfree(ibr); | |
272 | } | |
273 | ||
274 | static void iblock_bio_done(struct bio *bio, int err) | |
275 | { | |
276 | struct se_cmd *cmd = bio->bi_private; | |
277 | struct iblock_req *ibr = cmd->priv; | |
278 | ||
279 | /* | |
280 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
281 | */ | |
282 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) | |
283 | err = -EIO; | |
284 | ||
285 | if (err != 0) { | |
286 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," | |
287 | " err: %d\n", bio, err); | |
288 | /* | |
289 | * Bump the ib_bio_err_cnt and release bio. | |
290 | */ | |
291 | atomic_inc(&ibr->ib_bio_err_cnt); | |
292 | smp_mb__after_atomic_inc(); | |
293 | } | |
294 | ||
295 | bio_put(bio); | |
296 | ||
297 | iblock_complete_cmd(cmd); | |
298 | } | |
299 | ||
300 | static struct bio * | |
301 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) | |
302 | { | |
303 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); | |
304 | struct bio *bio; | |
305 | ||
306 | /* | |
307 | * Only allocate as many vector entries as the bio code allows us to, | |
308 | * we'll loop later on until we have handled the whole request. | |
309 | */ | |
310 | if (sg_num > BIO_MAX_PAGES) | |
311 | sg_num = BIO_MAX_PAGES; | |
312 | ||
313 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); | |
314 | if (!bio) { | |
315 | pr_err("Unable to allocate memory for bio\n"); | |
316 | return NULL; | |
317 | } | |
318 | ||
319 | bio->bi_bdev = ib_dev->ibd_bd; | |
320 | bio->bi_private = cmd; | |
321 | bio->bi_end_io = &iblock_bio_done; | |
322 | bio->bi_sector = lba; | |
323 | ||
324 | return bio; | |
325 | } | |
326 | ||
327 | static void iblock_submit_bios(struct bio_list *list, int rw) | |
328 | { | |
329 | struct blk_plug plug; | |
330 | struct bio *bio; | |
331 | ||
332 | blk_start_plug(&plug); | |
333 | while ((bio = bio_list_pop(list))) | |
334 | submit_bio(rw, bio); | |
335 | blk_finish_plug(&plug); | |
336 | } | |
337 | ||
df5fa691 CH |
338 | static void iblock_end_io_flush(struct bio *bio, int err) |
339 | { | |
340 | struct se_cmd *cmd = bio->bi_private; | |
341 | ||
342 | if (err) | |
343 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
344 | ||
5787cacd | 345 | if (cmd) { |
de103c93 | 346 | if (err) |
5787cacd | 347 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 348 | else |
5787cacd | 349 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
5787cacd CH |
350 | } |
351 | ||
df5fa691 CH |
352 | bio_put(bio); |
353 | } | |
354 | ||
c66ac9db | 355 | /* |
df5fa691 CH |
356 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
357 | * always flush the whole cache. | |
c66ac9db | 358 | */ |
de103c93 CH |
359 | static sense_reason_t |
360 | iblock_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 361 | { |
0fd97ccf | 362 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 363 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 364 | struct bio *bio; |
c66ac9db NB |
365 | |
366 | /* | |
367 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 368 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
369 | */ |
370 | if (immed) | |
5787cacd | 371 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 372 | |
df5fa691 CH |
373 | bio = bio_alloc(GFP_KERNEL, 0); |
374 | bio->bi_end_io = iblock_end_io_flush; | |
375 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 376 | if (!immed) |
df5fa691 CH |
377 | bio->bi_private = cmd; |
378 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 379 | return 0; |
c66ac9db NB |
380 | } |
381 | ||
de103c93 CH |
382 | static sense_reason_t |
383 | iblock_execute_unmap(struct se_cmd *cmd) | |
c66ac9db | 384 | { |
14150a6b | 385 | struct se_device *dev = cmd->se_dev; |
0fd97ccf | 386 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
14150a6b | 387 | unsigned char *buf, *ptr = NULL; |
14150a6b | 388 | sector_t lba; |
0d7f1299 | 389 | int size; |
b7fc7f37 | 390 | u32 range; |
de103c93 CH |
391 | sense_reason_t ret = 0; |
392 | int dl, bd_dl, err; | |
14150a6b | 393 | |
bb992e72 RD |
394 | /* We never set ANC_SUP */ |
395 | if (cmd->t_task_cdb[1]) | |
396 | return TCM_INVALID_CDB_FIELD; | |
397 | ||
398 | if (cmd->data_length == 0) { | |
399 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
400 | return 0; | |
401 | } | |
402 | ||
0d7f1299 PB |
403 | if (cmd->data_length < 8) { |
404 | pr_warn("UNMAP parameter list length %u too small\n", | |
405 | cmd->data_length); | |
bb992e72 | 406 | return TCM_PARAMETER_LIST_LENGTH_ERROR; |
0d7f1299 PB |
407 | } |
408 | ||
14150a6b | 409 | buf = transport_kmap_data_sg(cmd); |
de103c93 CH |
410 | if (!buf) |
411 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
14150a6b | 412 | |
1a5fa457 RD |
413 | dl = get_unaligned_be16(&buf[0]); |
414 | bd_dl = get_unaligned_be16(&buf[2]); | |
415 | ||
0d7f1299 PB |
416 | size = cmd->data_length - 8; |
417 | if (bd_dl > size) | |
418 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
419 | cmd->data_length, bd_dl); | |
420 | else | |
421 | size = bd_dl; | |
422 | ||
0fd97ccf | 423 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
de103c93 | 424 | ret = TCM_INVALID_PARAMETER_LIST; |
7409a665 RD |
425 | goto err; |
426 | } | |
b7fc7f37 RD |
427 | |
428 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
429 | ptr = &buf[8]; | |
430 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
14150a6b CH |
431 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
432 | ||
b7fc7f37 | 433 | while (size >= 16) { |
14150a6b CH |
434 | lba = get_unaligned_be64(&ptr[0]); |
435 | range = get_unaligned_be32(&ptr[8]); | |
436 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
437 | (unsigned long long)lba, range); | |
438 | ||
0fd97ccf | 439 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
de103c93 | 440 | ret = TCM_INVALID_PARAMETER_LIST; |
2594e298 RD |
441 | goto err; |
442 | } | |
443 | ||
444 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
de103c93 | 445 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
2594e298 RD |
446 | goto err; |
447 | } | |
448 | ||
de103c93 | 449 | err = blkdev_issue_discard(ib_dev->ibd_bd, lba, range, |
14150a6b | 450 | GFP_KERNEL, 0); |
de103c93 | 451 | if (err < 0) { |
14150a6b | 452 | pr_err("blkdev_issue_discard() failed: %d\n", |
de103c93 CH |
453 | err); |
454 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
14150a6b CH |
455 | goto err; |
456 | } | |
457 | ||
458 | ptr += 16; | |
459 | size -= 16; | |
460 | } | |
c66ac9db | 461 | |
14150a6b CH |
462 | err: |
463 | transport_kunmap_data_sg(cmd); | |
464 | if (!ret) | |
465 | target_complete_cmd(cmd, GOOD); | |
466 | return ret; | |
c66ac9db NB |
467 | } |
468 | ||
de103c93 | 469 | static sense_reason_t |
f6970ad3 | 470 | iblock_execute_write_same_unmap(struct se_cmd *cmd) |
6f974e8c | 471 | { |
0fd97ccf | 472 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
f6970ad3 | 473 | int rc; |
6f974e8c | 474 | |
f6970ad3 | 475 | rc = blkdev_issue_discard(ib_dev->ibd_bd, cmd->t_task_lba, |
972b29c8 | 476 | sbc_get_write_same_sectors(cmd), GFP_KERNEL, 0); |
f6970ad3 NB |
477 | if (rc < 0) { |
478 | pr_warn("blkdev_issue_discard() failed: %d\n", rc); | |
de103c93 | 479 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
6f974e8c CH |
480 | } |
481 | ||
482 | target_complete_cmd(cmd, GOOD); | |
483 | return 0; | |
484 | } | |
485 | ||
f6970ad3 NB |
486 | static sense_reason_t |
487 | iblock_execute_write_same(struct se_cmd *cmd) | |
488 | { | |
489 | struct iblock_req *ibr; | |
490 | struct scatterlist *sg; | |
491 | struct bio *bio; | |
492 | struct bio_list list; | |
493 | sector_t block_lba = cmd->t_task_lba; | |
972b29c8 | 494 | sector_t sectors = sbc_get_write_same_sectors(cmd); |
f6970ad3 NB |
495 | |
496 | sg = &cmd->t_data_sg[0]; | |
497 | ||
498 | if (cmd->t_data_nents > 1 || | |
499 | sg->length != cmd->se_dev->dev_attrib.block_size) { | |
500 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" | |
501 | " block_size: %u\n", cmd->t_data_nents, sg->length, | |
502 | cmd->se_dev->dev_attrib.block_size); | |
503 | return TCM_INVALID_CDB_FIELD; | |
504 | } | |
505 | ||
506 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); | |
507 | if (!ibr) | |
508 | goto fail; | |
509 | cmd->priv = ibr; | |
510 | ||
511 | bio = iblock_get_bio(cmd, block_lba, 1); | |
512 | if (!bio) | |
513 | goto fail_free_ibr; | |
514 | ||
515 | bio_list_init(&list); | |
516 | bio_list_add(&list, bio); | |
517 | ||
518 | atomic_set(&ibr->pending, 1); | |
519 | ||
520 | while (sectors) { | |
521 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
522 | != sg->length) { | |
523 | ||
524 | bio = iblock_get_bio(cmd, block_lba, 1); | |
525 | if (!bio) | |
526 | goto fail_put_bios; | |
527 | ||
528 | atomic_inc(&ibr->pending); | |
529 | bio_list_add(&list, bio); | |
530 | } | |
531 | ||
532 | /* Always in 512 byte units for Linux/Block */ | |
533 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
534 | sectors -= 1; | |
535 | } | |
536 | ||
537 | iblock_submit_bios(&list, WRITE); | |
538 | return 0; | |
539 | ||
540 | fail_put_bios: | |
541 | while ((bio = bio_list_pop(&list))) | |
542 | bio_put(bio); | |
543 | fail_free_ibr: | |
544 | kfree(ibr); | |
545 | fail: | |
546 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
547 | } | |
548 | ||
c66ac9db | 549 | enum { |
44bfd018 | 550 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
551 | }; |
552 | ||
553 | static match_table_t tokens = { | |
554 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 555 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
556 | {Opt_force, "force=%d"}, |
557 | {Opt_err, NULL} | |
558 | }; | |
559 | ||
0fd97ccf CH |
560 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
561 | const char *page, ssize_t count) | |
c66ac9db | 562 | { |
0fd97ccf | 563 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 564 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 565 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 566 | int ret = 0, token; |
44bfd018 | 567 | unsigned long tmp_readonly; |
c66ac9db NB |
568 | |
569 | opts = kstrdup(page, GFP_KERNEL); | |
570 | if (!opts) | |
571 | return -ENOMEM; | |
572 | ||
573 | orig = opts; | |
574 | ||
90c161b6 | 575 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
576 | if (!*ptr) |
577 | continue; | |
578 | ||
579 | token = match_token(ptr, tokens, args); | |
580 | switch (token) { | |
581 | case Opt_udev_path: | |
582 | if (ib_dev->ibd_bd) { | |
6708bb27 | 583 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
584 | " ib_dev->ibd_bd exists\n"); |
585 | ret = -EEXIST; | |
586 | goto out; | |
587 | } | |
852b6ed1 NB |
588 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
589 | SE_UDEV_PATH_LEN) == 0) { | |
590 | ret = -EINVAL; | |
6d180253 JJ |
591 | break; |
592 | } | |
6708bb27 | 593 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
594 | ib_dev->ibd_udev_path); |
595 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
596 | break; | |
44bfd018 AG |
597 | case Opt_readonly: |
598 | arg_p = match_strdup(&args[0]); | |
599 | if (!arg_p) { | |
600 | ret = -ENOMEM; | |
601 | break; | |
602 | } | |
603 | ret = strict_strtoul(arg_p, 0, &tmp_readonly); | |
604 | kfree(arg_p); | |
605 | if (ret < 0) { | |
606 | pr_err("strict_strtoul() failed for" | |
607 | " readonly=\n"); | |
608 | goto out; | |
609 | } | |
610 | ib_dev->ibd_readonly = tmp_readonly; | |
611 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
612 | break; | |
c66ac9db | 613 | case Opt_force: |
c66ac9db NB |
614 | break; |
615 | default: | |
616 | break; | |
617 | } | |
618 | } | |
619 | ||
620 | out: | |
621 | kfree(orig); | |
622 | return (!ret) ? count : ret; | |
623 | } | |
624 | ||
0fd97ccf | 625 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 626 | { |
0fd97ccf CH |
627 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
628 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
629 | char buf[BDEVNAME_SIZE]; |
630 | ssize_t bl = 0; | |
631 | ||
632 | if (bd) | |
633 | bl += sprintf(b + bl, "iBlock device: %s", | |
634 | bdevname(bd, buf)); | |
0fd97ccf | 635 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 636 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
637 | ib_dev->ibd_udev_path); |
638 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
639 | |
640 | bl += sprintf(b + bl, " "); | |
641 | if (bd) { | |
642 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 643 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 644 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
645 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
646 | } else { | |
21bca31c | 647 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
648 | } |
649 | ||
650 | return bl; | |
651 | } | |
652 | ||
de103c93 CH |
653 | static sense_reason_t |
654 | iblock_execute_rw(struct se_cmd *cmd) | |
c66ac9db | 655 | { |
0c2ad7d1 CH |
656 | struct scatterlist *sgl = cmd->t_data_sg; |
657 | u32 sgl_nents = cmd->t_data_nents; | |
658 | enum dma_data_direction data_direction = cmd->data_direction; | |
5951146d | 659 | struct se_device *dev = cmd->se_dev; |
5787cacd | 660 | struct iblock_req *ibr; |
dbbf3e94 CH |
661 | struct bio *bio; |
662 | struct bio_list list; | |
c66ac9db | 663 | struct scatterlist *sg; |
5787cacd | 664 | u32 sg_num = sgl_nents; |
c66ac9db | 665 | sector_t block_lba; |
d5b4a21b | 666 | unsigned bio_cnt; |
d0c8b259 | 667 | int rw = 0; |
5787cacd | 668 | int i; |
dbbf3e94 | 669 | |
5787cacd | 670 | if (data_direction == DMA_TO_DEVICE) { |
d0c8b259 NB |
671 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
672 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); | |
dbbf3e94 | 673 | /* |
d0c8b259 NB |
674 | * Force writethrough using WRITE_FUA if a volatile write cache |
675 | * is not enabled, or if initiator set the Force Unit Access bit. | |
dbbf3e94 | 676 | */ |
d0c8b259 NB |
677 | if (q->flush_flags & REQ_FUA) { |
678 | if (cmd->se_cmd_flags & SCF_FUA) | |
679 | rw = WRITE_FUA; | |
680 | else if (!(q->flush_flags & REQ_FLUSH)) | |
681 | rw = WRITE_FUA; | |
682 | } else { | |
dbbf3e94 | 683 | rw = WRITE; |
d0c8b259 | 684 | } |
dbbf3e94 CH |
685 | } else { |
686 | rw = READ; | |
687 | } | |
688 | ||
c66ac9db | 689 | /* |
5787cacd CH |
690 | * Convert the blocksize advertised to the initiator to the 512 byte |
691 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 692 | */ |
0fd97ccf | 693 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 694 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 695 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 696 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 697 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 698 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 699 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 700 | block_lba = cmd->t_task_lba; |
c66ac9db | 701 | else { |
6708bb27 | 702 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 703 | " %u\n", dev->dev_attrib.block_size); |
de103c93 | 704 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
705 | } |
706 | ||
5787cacd CH |
707 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
708 | if (!ibr) | |
709 | goto fail; | |
710 | cmd->priv = ibr; | |
711 | ||
e0de4457 PB |
712 | if (!sgl_nents) { |
713 | atomic_set(&ibr->pending, 1); | |
714 | iblock_complete_cmd(cmd); | |
715 | return 0; | |
716 | } | |
717 | ||
5787cacd CH |
718 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
719 | if (!bio) | |
720 | goto fail_free_ibr; | |
dbbf3e94 CH |
721 | |
722 | bio_list_init(&list); | |
723 | bio_list_add(&list, bio); | |
5787cacd CH |
724 | |
725 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 726 | bio_cnt = 1; |
c66ac9db | 727 | |
5787cacd | 728 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
729 | /* |
730 | * XXX: if the length the device accepts is shorter than the | |
731 | * length of the S/G list entry this will cause and | |
732 | * endless loop. Better hope no driver uses huge pages. | |
733 | */ | |
734 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
735 | != sg->length) { | |
d5b4a21b CH |
736 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
737 | iblock_submit_bios(&list, rw); | |
738 | bio_cnt = 0; | |
739 | } | |
740 | ||
5787cacd | 741 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 742 | if (!bio) |
5787cacd CH |
743 | goto fail_put_bios; |
744 | ||
745 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 746 | bio_list_add(&list, bio); |
d5b4a21b | 747 | bio_cnt++; |
c66ac9db | 748 | } |
dbbf3e94 | 749 | |
c66ac9db NB |
750 | /* Always in 512 byte units for Linux/Block */ |
751 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
752 | sg_num--; | |
c66ac9db NB |
753 | } |
754 | ||
d5b4a21b | 755 | iblock_submit_bios(&list, rw); |
5787cacd | 756 | iblock_complete_cmd(cmd); |
03e98c9e | 757 | return 0; |
dbbf3e94 | 758 | |
5787cacd | 759 | fail_put_bios: |
dbbf3e94 | 760 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 761 | bio_put(bio); |
5787cacd CH |
762 | fail_free_ibr: |
763 | kfree(ibr); | |
5787cacd | 764 | fail: |
de103c93 | 765 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
c66ac9db NB |
766 | } |
767 | ||
c66ac9db NB |
768 | static sector_t iblock_get_blocks(struct se_device *dev) |
769 | { | |
0fd97ccf CH |
770 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
771 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
772 | struct request_queue *q = bdev_get_queue(bd); |
773 | ||
774 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
775 | } | |
776 | ||
9e999a6c | 777 | static struct sbc_ops iblock_sbc_ops = { |
0c2ad7d1 | 778 | .execute_rw = iblock_execute_rw, |
ad67f0d9 | 779 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 780 | .execute_write_same = iblock_execute_write_same, |
f6970ad3 | 781 | .execute_write_same_unmap = iblock_execute_write_same_unmap, |
14150a6b | 782 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
783 | }; |
784 | ||
de103c93 CH |
785 | static sense_reason_t |
786 | iblock_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 787 | { |
9e999a6c | 788 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
0c2ad7d1 CH |
789 | } |
790 | ||
d0c8b259 NB |
791 | bool iblock_get_write_cache(struct se_device *dev) |
792 | { | |
793 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); | |
794 | struct block_device *bd = ib_dev->ibd_bd; | |
795 | struct request_queue *q = bdev_get_queue(bd); | |
796 | ||
797 | return q->flush_flags & REQ_FLUSH; | |
798 | } | |
799 | ||
c66ac9db NB |
800 | static struct se_subsystem_api iblock_template = { |
801 | .name = "iblock", | |
0fd97ccf CH |
802 | .inquiry_prod = "IBLOCK", |
803 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db NB |
804 | .owner = THIS_MODULE, |
805 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
c66ac9db NB |
806 | .attach_hba = iblock_attach_hba, |
807 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
808 | .alloc_device = iblock_alloc_device, |
809 | .configure_device = iblock_configure_device, | |
c66ac9db | 810 | .free_device = iblock_free_device, |
0c2ad7d1 | 811 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
812 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
813 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
6f23ac8a | 814 | .get_device_type = sbc_get_device_type, |
c66ac9db | 815 | .get_blocks = iblock_get_blocks, |
d0c8b259 | 816 | .get_write_cache = iblock_get_write_cache, |
c66ac9db NB |
817 | }; |
818 | ||
819 | static int __init iblock_module_init(void) | |
820 | { | |
821 | return transport_subsystem_register(&iblock_template); | |
822 | } | |
823 | ||
63b91d5a | 824 | static void __exit iblock_module_exit(void) |
c66ac9db NB |
825 | { |
826 | transport_subsystem_release(&iblock_template); | |
827 | } | |
828 | ||
829 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
830 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
831 | MODULE_LICENSE("GPL"); | |
832 | ||
833 | module_init(iblock_module_init); | |
834 | module_exit(iblock_module_exit); |