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 | * | |
7 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. | |
8 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
9 | * Copyright (c) 2007-2010 Rising Tide Systems | |
10 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
11 | * | |
12 | * Nicholas A. Bellinger <nab@kernel.org> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
27 | * | |
28 | ******************************************************************************/ | |
29 | ||
c66ac9db NB |
30 | #include <linux/string.h> |
31 | #include <linux/parser.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/fs.h> | |
34 | #include <linux/blkdev.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/spinlock.h> | |
c66ac9db NB |
37 | #include <linux/bio.h> |
38 | #include <linux/genhd.h> | |
39 | #include <linux/file.h> | |
827509e3 | 40 | #include <linux/module.h> |
c66ac9db NB |
41 | #include <scsi/scsi.h> |
42 | #include <scsi/scsi_host.h> | |
14150a6b | 43 | #include <asm/unaligned.h> |
c66ac9db NB |
44 | |
45 | #include <target/target_core_base.h> | |
c4795fb2 | 46 | #include <target/target_core_backend.h> |
c66ac9db NB |
47 | |
48 | #include "target_core_iblock.h" | |
49 | ||
d5b4a21b CH |
50 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
51 | #define IBLOCK_BIO_POOL_SIZE 128 | |
52 | ||
0fd97ccf CH |
53 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
54 | { | |
55 | return container_of(dev, struct iblock_dev, dev); | |
56 | } | |
57 | ||
58 | ||
c66ac9db NB |
59 | static struct se_subsystem_api iblock_template; |
60 | ||
61 | static void iblock_bio_done(struct bio *, int); | |
62 | ||
63 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) | |
64 | * | |
65 | * | |
66 | */ | |
67 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
68 | { | |
6708bb27 | 69 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
70 | " Generic Target Core Stack %s\n", hba->hba_id, |
71 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
72 | return 0; |
73 | } | |
74 | ||
75 | static void iblock_detach_hba(struct se_hba *hba) | |
76 | { | |
c66ac9db NB |
77 | } |
78 | ||
0fd97ccf | 79 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
80 | { |
81 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
82 | |
83 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
84 | if (!ib_dev) { |
85 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
86 | return NULL; |
87 | } | |
c66ac9db | 88 | |
6708bb27 | 89 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db | 90 | |
0fd97ccf | 91 | return &ib_dev->dev; |
c66ac9db NB |
92 | } |
93 | ||
0fd97ccf | 94 | static int iblock_configure_device(struct se_device *dev) |
c66ac9db | 95 | { |
0fd97ccf | 96 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
c66ac9db | 97 | struct request_queue *q; |
0fd97ccf | 98 | struct block_device *bd = NULL; |
44bfd018 | 99 | fmode_t mode; |
0fd97ccf | 100 | int ret = -ENOMEM; |
c66ac9db | 101 | |
0fd97ccf CH |
102 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
103 | pr_err("Missing udev_path= parameters for IBLOCK\n"); | |
104 | return -EINVAL; | |
c66ac9db | 105 | } |
d5b4a21b CH |
106 | |
107 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 | 108 | if (!ib_dev->ibd_bio_set) { |
0fd97ccf CH |
109 | pr_err("IBLOCK: Unable to create bioset\n"); |
110 | goto out; | |
c66ac9db | 111 | } |
0fd97ccf | 112 | |
6708bb27 | 113 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
114 | ib_dev->ibd_udev_path); |
115 | ||
44bfd018 AG |
116 | mode = FMODE_READ|FMODE_EXCL; |
117 | if (!ib_dev->ibd_readonly) | |
118 | mode |= FMODE_WRITE; | |
119 | ||
120 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
121 | if (IS_ERR(bd)) { |
122 | ret = PTR_ERR(bd); | |
0fd97ccf | 123 | goto out_free_bioset; |
613640e4 | 124 | } |
c66ac9db NB |
125 | ib_dev->ibd_bd = bd; |
126 | ||
0fd97ccf CH |
127 | q = bdev_get_queue(bd); |
128 | ||
129 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); | |
130 | dev->dev_attrib.hw_max_sectors = UINT_MAX; | |
131 | dev->dev_attrib.hw_queue_depth = q->nr_requests; | |
c66ac9db | 132 | |
c66ac9db NB |
133 | /* |
134 | * Check if the underlying struct block_device request_queue supports | |
135 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
136 | * in ATA and we need to set TPE=1 | |
137 | */ | |
613640e4 | 138 | if (blk_queue_discard(q)) { |
0fd97ccf | 139 | dev->dev_attrib.max_unmap_lba_count = |
c66ac9db | 140 | q->limits.max_discard_sectors; |
0fd97ccf | 141 | |
c66ac9db NB |
142 | /* |
143 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
144 | */ | |
0fd97ccf CH |
145 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
146 | dev->dev_attrib.unmap_granularity = | |
7347b5ff | 147 | q->limits.discard_granularity >> 9; |
0fd97ccf | 148 | dev->dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
149 | q->limits.discard_alignment; |
150 | ||
6708bb27 | 151 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
152 | " disabled by default\n"); |
153 | } | |
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 | ||
df5fa691 CH |
256 | static void iblock_end_io_flush(struct bio *bio, int err) |
257 | { | |
258 | struct se_cmd *cmd = bio->bi_private; | |
259 | ||
260 | if (err) | |
261 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
262 | ||
5787cacd CH |
263 | if (cmd) { |
264 | if (err) { | |
265 | cmd->scsi_sense_reason = | |
266 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
267 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); | |
268 | } else { | |
269 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
270 | } | |
271 | } | |
272 | ||
df5fa691 CH |
273 | bio_put(bio); |
274 | } | |
275 | ||
c66ac9db | 276 | /* |
df5fa691 CH |
277 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
278 | * always flush the whole cache. | |
c66ac9db | 279 | */ |
ad67f0d9 | 280 | static int iblock_execute_sync_cache(struct se_cmd *cmd) |
c66ac9db | 281 | { |
0fd97ccf | 282 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
a1d8b49a | 283 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 284 | struct bio *bio; |
c66ac9db NB |
285 | |
286 | /* | |
287 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 288 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
289 | */ |
290 | if (immed) | |
5787cacd | 291 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 292 | |
df5fa691 CH |
293 | bio = bio_alloc(GFP_KERNEL, 0); |
294 | bio->bi_end_io = iblock_end_io_flush; | |
295 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 296 | if (!immed) |
df5fa691 CH |
297 | bio->bi_private = cmd; |
298 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 299 | return 0; |
c66ac9db NB |
300 | } |
301 | ||
14150a6b | 302 | static int iblock_execute_unmap(struct se_cmd *cmd) |
c66ac9db | 303 | { |
14150a6b | 304 | struct se_device *dev = cmd->se_dev; |
0fd97ccf | 305 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
14150a6b | 306 | unsigned char *buf, *ptr = NULL; |
14150a6b | 307 | sector_t lba; |
0d7f1299 | 308 | int size; |
b7fc7f37 RD |
309 | u32 range; |
310 | int ret = 0; | |
311 | int dl, bd_dl; | |
14150a6b | 312 | |
0d7f1299 PB |
313 | if (cmd->data_length < 8) { |
314 | pr_warn("UNMAP parameter list length %u too small\n", | |
315 | cmd->data_length); | |
316 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
14150a6b CH |
320 | buf = transport_kmap_data_sg(cmd); |
321 | ||
1a5fa457 RD |
322 | dl = get_unaligned_be16(&buf[0]); |
323 | bd_dl = get_unaligned_be16(&buf[2]); | |
324 | ||
0d7f1299 PB |
325 | size = cmd->data_length - 8; |
326 | if (bd_dl > size) | |
327 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
328 | cmd->data_length, bd_dl); | |
329 | else | |
330 | size = bd_dl; | |
331 | ||
0fd97ccf | 332 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
7409a665 RD |
333 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
334 | ret = -EINVAL; | |
335 | goto err; | |
336 | } | |
b7fc7f37 RD |
337 | |
338 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
339 | ptr = &buf[8]; | |
340 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
14150a6b CH |
341 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
342 | ||
b7fc7f37 | 343 | while (size >= 16) { |
14150a6b CH |
344 | lba = get_unaligned_be64(&ptr[0]); |
345 | range = get_unaligned_be32(&ptr[8]); | |
346 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
347 | (unsigned long long)lba, range); | |
348 | ||
0fd97ccf | 349 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
2594e298 RD |
350 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
351 | ret = -EINVAL; | |
352 | goto err; | |
353 | } | |
354 | ||
355 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
356 | cmd->scsi_sense_reason = TCM_ADDRESS_OUT_OF_RANGE; | |
357 | ret = -EINVAL; | |
358 | goto err; | |
359 | } | |
360 | ||
0fd97ccf | 361 | ret = blkdev_issue_discard(ib_dev->ibd_bd, lba, range, |
14150a6b CH |
362 | GFP_KERNEL, 0); |
363 | if (ret < 0) { | |
364 | pr_err("blkdev_issue_discard() failed: %d\n", | |
365 | ret); | |
366 | goto err; | |
367 | } | |
368 | ||
369 | ptr += 16; | |
370 | size -= 16; | |
371 | } | |
c66ac9db | 372 | |
14150a6b CH |
373 | err: |
374 | transport_kunmap_data_sg(cmd); | |
375 | if (!ret) | |
376 | target_complete_cmd(cmd, GOOD); | |
377 | return ret; | |
c66ac9db NB |
378 | } |
379 | ||
6f974e8c CH |
380 | static int iblock_execute_write_same(struct se_cmd *cmd) |
381 | { | |
0fd97ccf | 382 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
6f974e8c CH |
383 | int ret; |
384 | ||
0fd97ccf | 385 | ret = blkdev_issue_discard(ib_dev->ibd_bd, cmd->t_task_lba, |
6f974e8c CH |
386 | spc_get_write_same_sectors(cmd), GFP_KERNEL, |
387 | 0); | |
388 | if (ret < 0) { | |
389 | pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n"); | |
390 | return ret; | |
391 | } | |
392 | ||
393 | target_complete_cmd(cmd, GOOD); | |
394 | return 0; | |
395 | } | |
396 | ||
c66ac9db | 397 | enum { |
44bfd018 | 398 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
399 | }; |
400 | ||
401 | static match_table_t tokens = { | |
402 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 403 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
404 | {Opt_force, "force=%d"}, |
405 | {Opt_err, NULL} | |
406 | }; | |
407 | ||
0fd97ccf CH |
408 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
409 | const char *page, ssize_t count) | |
c66ac9db | 410 | { |
0fd97ccf | 411 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
6d180253 | 412 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 413 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 414 | int ret = 0, token; |
44bfd018 | 415 | unsigned long tmp_readonly; |
c66ac9db NB |
416 | |
417 | opts = kstrdup(page, GFP_KERNEL); | |
418 | if (!opts) | |
419 | return -ENOMEM; | |
420 | ||
421 | orig = opts; | |
422 | ||
90c161b6 | 423 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
424 | if (!*ptr) |
425 | continue; | |
426 | ||
427 | token = match_token(ptr, tokens, args); | |
428 | switch (token) { | |
429 | case Opt_udev_path: | |
430 | if (ib_dev->ibd_bd) { | |
6708bb27 | 431 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
432 | " ib_dev->ibd_bd exists\n"); |
433 | ret = -EEXIST; | |
434 | goto out; | |
435 | } | |
852b6ed1 NB |
436 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
437 | SE_UDEV_PATH_LEN) == 0) { | |
438 | ret = -EINVAL; | |
6d180253 JJ |
439 | break; |
440 | } | |
6708bb27 | 441 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
442 | ib_dev->ibd_udev_path); |
443 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
444 | break; | |
44bfd018 AG |
445 | case Opt_readonly: |
446 | arg_p = match_strdup(&args[0]); | |
447 | if (!arg_p) { | |
448 | ret = -ENOMEM; | |
449 | break; | |
450 | } | |
451 | ret = strict_strtoul(arg_p, 0, &tmp_readonly); | |
452 | kfree(arg_p); | |
453 | if (ret < 0) { | |
454 | pr_err("strict_strtoul() failed for" | |
455 | " readonly=\n"); | |
456 | goto out; | |
457 | } | |
458 | ib_dev->ibd_readonly = tmp_readonly; | |
459 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
460 | break; | |
c66ac9db | 461 | case Opt_force: |
c66ac9db NB |
462 | break; |
463 | default: | |
464 | break; | |
465 | } | |
466 | } | |
467 | ||
468 | out: | |
469 | kfree(orig); | |
470 | return (!ret) ? count : ret; | |
471 | } | |
472 | ||
0fd97ccf | 473 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 474 | { |
0fd97ccf CH |
475 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
476 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
477 | char buf[BDEVNAME_SIZE]; |
478 | ssize_t bl = 0; | |
479 | ||
480 | if (bd) | |
481 | bl += sprintf(b + bl, "iBlock device: %s", | |
482 | bdevname(bd, buf)); | |
0fd97ccf | 483 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
44bfd018 | 484 | bl += sprintf(b + bl, " UDEV PATH: %s", |
0fd97ccf CH |
485 | ib_dev->ibd_udev_path); |
486 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); | |
c66ac9db NB |
487 | |
488 | bl += sprintf(b + bl, " "); | |
489 | if (bd) { | |
490 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 491 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
0fd97ccf | 492 | "" : (bd->bd_holder == ib_dev) ? |
c66ac9db NB |
493 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
494 | } else { | |
21bca31c | 495 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
496 | } |
497 | ||
498 | return bl; | |
499 | } | |
500 | ||
5787cacd CH |
501 | static void iblock_complete_cmd(struct se_cmd *cmd) |
502 | { | |
503 | struct iblock_req *ibr = cmd->priv; | |
504 | u8 status; | |
505 | ||
506 | if (!atomic_dec_and_test(&ibr->pending)) | |
507 | return; | |
508 | ||
509 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
510 | status = SAM_STAT_CHECK_CONDITION; | |
511 | else | |
512 | status = SAM_STAT_GOOD; | |
513 | ||
514 | target_complete_cmd(cmd, status); | |
515 | kfree(ibr); | |
516 | } | |
517 | ||
dbbf3e94 | 518 | static struct bio * |
5787cacd | 519 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) |
c66ac9db | 520 | { |
0fd97ccf | 521 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
c66ac9db NB |
522 | struct bio *bio; |
523 | ||
5c55125f CH |
524 | /* |
525 | * Only allocate as many vector entries as the bio code allows us to, | |
526 | * we'll loop later on until we have handled the whole request. | |
527 | */ | |
528 | if (sg_num > BIO_MAX_PAGES) | |
529 | sg_num = BIO_MAX_PAGES; | |
530 | ||
c66ac9db | 531 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
6708bb27 AG |
532 | if (!bio) { |
533 | pr_err("Unable to allocate memory for bio\n"); | |
c66ac9db NB |
534 | return NULL; |
535 | } | |
536 | ||
c66ac9db | 537 | bio->bi_bdev = ib_dev->ibd_bd; |
5787cacd | 538 | bio->bi_private = cmd; |
c66ac9db NB |
539 | bio->bi_end_io = &iblock_bio_done; |
540 | bio->bi_sector = lba; | |
c66ac9db NB |
541 | return bio; |
542 | } | |
543 | ||
d5b4a21b CH |
544 | static void iblock_submit_bios(struct bio_list *list, int rw) |
545 | { | |
546 | struct blk_plug plug; | |
547 | struct bio *bio; | |
548 | ||
549 | blk_start_plug(&plug); | |
550 | while ((bio = bio_list_pop(list))) | |
551 | submit_bio(rw, bio); | |
552 | blk_finish_plug(&plug); | |
553 | } | |
554 | ||
0c2ad7d1 | 555 | static int iblock_execute_rw(struct se_cmd *cmd) |
c66ac9db | 556 | { |
0c2ad7d1 CH |
557 | struct scatterlist *sgl = cmd->t_data_sg; |
558 | u32 sgl_nents = cmd->t_data_nents; | |
559 | enum dma_data_direction data_direction = cmd->data_direction; | |
5951146d | 560 | struct se_device *dev = cmd->se_dev; |
5787cacd | 561 | struct iblock_req *ibr; |
dbbf3e94 CH |
562 | struct bio *bio; |
563 | struct bio_list list; | |
c66ac9db | 564 | struct scatterlist *sg; |
5787cacd | 565 | u32 sg_num = sgl_nents; |
c66ac9db | 566 | sector_t block_lba; |
d5b4a21b | 567 | unsigned bio_cnt; |
dbbf3e94 | 568 | int rw; |
5787cacd | 569 | int i; |
dbbf3e94 | 570 | |
5787cacd | 571 | if (data_direction == DMA_TO_DEVICE) { |
dbbf3e94 CH |
572 | /* |
573 | * Force data to disk if we pretend to not have a volatile | |
574 | * write cache, or the initiator set the Force Unit Access bit. | |
575 | */ | |
0fd97ccf CH |
576 | if (dev->dev_attrib.emulate_write_cache == 0 || |
577 | (dev->dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 578 | (cmd->se_cmd_flags & SCF_FUA))) |
dbbf3e94 CH |
579 | rw = WRITE_FUA; |
580 | else | |
581 | rw = WRITE; | |
582 | } else { | |
583 | rw = READ; | |
584 | } | |
585 | ||
c66ac9db | 586 | /* |
5787cacd CH |
587 | * Convert the blocksize advertised to the initiator to the 512 byte |
588 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 589 | */ |
0fd97ccf | 590 | if (dev->dev_attrib.block_size == 4096) |
72a0e5e2 | 591 | block_lba = (cmd->t_task_lba << 3); |
0fd97ccf | 592 | else if (dev->dev_attrib.block_size == 2048) |
72a0e5e2 | 593 | block_lba = (cmd->t_task_lba << 2); |
0fd97ccf | 594 | else if (dev->dev_attrib.block_size == 1024) |
72a0e5e2 | 595 | block_lba = (cmd->t_task_lba << 1); |
0fd97ccf | 596 | else if (dev->dev_attrib.block_size == 512) |
72a0e5e2 | 597 | block_lba = cmd->t_task_lba; |
c66ac9db | 598 | else { |
6708bb27 | 599 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
0fd97ccf | 600 | " %u\n", dev->dev_attrib.block_size); |
03e98c9e NB |
601 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
602 | return -ENOSYS; | |
c66ac9db NB |
603 | } |
604 | ||
5787cacd CH |
605 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
606 | if (!ibr) | |
607 | goto fail; | |
608 | cmd->priv = ibr; | |
609 | ||
e0de4457 PB |
610 | if (!sgl_nents) { |
611 | atomic_set(&ibr->pending, 1); | |
612 | iblock_complete_cmd(cmd); | |
613 | return 0; | |
614 | } | |
615 | ||
5787cacd CH |
616 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
617 | if (!bio) | |
618 | goto fail_free_ibr; | |
dbbf3e94 CH |
619 | |
620 | bio_list_init(&list); | |
621 | bio_list_add(&list, bio); | |
5787cacd CH |
622 | |
623 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 624 | bio_cnt = 1; |
c66ac9db | 625 | |
5787cacd | 626 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
627 | /* |
628 | * XXX: if the length the device accepts is shorter than the | |
629 | * length of the S/G list entry this will cause and | |
630 | * endless loop. Better hope no driver uses huge pages. | |
631 | */ | |
632 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
633 | != sg->length) { | |
d5b4a21b CH |
634 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
635 | iblock_submit_bios(&list, rw); | |
636 | bio_cnt = 0; | |
637 | } | |
638 | ||
5787cacd | 639 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 640 | if (!bio) |
5787cacd CH |
641 | goto fail_put_bios; |
642 | ||
643 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 644 | bio_list_add(&list, bio); |
d5b4a21b | 645 | bio_cnt++; |
c66ac9db | 646 | } |
dbbf3e94 | 647 | |
c66ac9db NB |
648 | /* Always in 512 byte units for Linux/Block */ |
649 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
650 | sg_num--; | |
c66ac9db NB |
651 | } |
652 | ||
d5b4a21b | 653 | iblock_submit_bios(&list, rw); |
5787cacd | 654 | iblock_complete_cmd(cmd); |
03e98c9e | 655 | return 0; |
dbbf3e94 | 656 | |
5787cacd | 657 | fail_put_bios: |
dbbf3e94 | 658 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 659 | bio_put(bio); |
5787cacd CH |
660 | fail_free_ibr: |
661 | kfree(ibr); | |
03e98c9e | 662 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
5787cacd | 663 | fail: |
03e98c9e | 664 | return -ENOMEM; |
c66ac9db NB |
665 | } |
666 | ||
c66ac9db NB |
667 | static u32 iblock_get_device_rev(struct se_device *dev) |
668 | { | |
669 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
670 | } | |
671 | ||
672 | static u32 iblock_get_device_type(struct se_device *dev) | |
673 | { | |
674 | return TYPE_DISK; | |
675 | } | |
676 | ||
677 | static sector_t iblock_get_blocks(struct se_device *dev) | |
678 | { | |
0fd97ccf CH |
679 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
680 | struct block_device *bd = ib_dev->ibd_bd; | |
c66ac9db NB |
681 | struct request_queue *q = bdev_get_queue(bd); |
682 | ||
683 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
684 | } | |
685 | ||
686 | static void iblock_bio_done(struct bio *bio, int err) | |
687 | { | |
5787cacd CH |
688 | struct se_cmd *cmd = bio->bi_private; |
689 | struct iblock_req *ibr = cmd->priv; | |
dbbf3e94 | 690 | |
c66ac9db NB |
691 | /* |
692 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
693 | */ | |
6708bb27 | 694 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
c66ac9db NB |
695 | err = -EIO; |
696 | ||
697 | if (err != 0) { | |
6708bb27 | 698 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
c66ac9db NB |
699 | " err: %d\n", bio, err); |
700 | /* | |
701 | * Bump the ib_bio_err_cnt and release bio. | |
702 | */ | |
703 | atomic_inc(&ibr->ib_bio_err_cnt); | |
704 | smp_mb__after_atomic_inc(); | |
c66ac9db | 705 | } |
dbbf3e94 | 706 | |
c66ac9db | 707 | bio_put(bio); |
dbbf3e94 | 708 | |
5787cacd | 709 | iblock_complete_cmd(cmd); |
c66ac9db NB |
710 | } |
711 | ||
0c2ad7d1 CH |
712 | static struct spc_ops iblock_spc_ops = { |
713 | .execute_rw = iblock_execute_rw, | |
ad67f0d9 | 714 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 715 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 716 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
717 | }; |
718 | ||
719 | static int iblock_parse_cdb(struct se_cmd *cmd) | |
720 | { | |
721 | return sbc_parse_cdb(cmd, &iblock_spc_ops); | |
722 | } | |
723 | ||
c66ac9db NB |
724 | static struct se_subsystem_api iblock_template = { |
725 | .name = "iblock", | |
0fd97ccf CH |
726 | .inquiry_prod = "IBLOCK", |
727 | .inquiry_rev = IBLOCK_VERSION, | |
c66ac9db NB |
728 | .owner = THIS_MODULE, |
729 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
c66ac9db NB |
730 | .attach_hba = iblock_attach_hba, |
731 | .detach_hba = iblock_detach_hba, | |
0fd97ccf CH |
732 | .alloc_device = iblock_alloc_device, |
733 | .configure_device = iblock_configure_device, | |
c66ac9db | 734 | .free_device = iblock_free_device, |
0c2ad7d1 | 735 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
736 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
737 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
c66ac9db NB |
738 | .get_device_rev = iblock_get_device_rev, |
739 | .get_device_type = iblock_get_device_type, | |
740 | .get_blocks = iblock_get_blocks, | |
741 | }; | |
742 | ||
743 | static int __init iblock_module_init(void) | |
744 | { | |
745 | return transport_subsystem_register(&iblock_template); | |
746 | } | |
747 | ||
748 | static void iblock_module_exit(void) | |
749 | { | |
750 | transport_subsystem_release(&iblock_template); | |
751 | } | |
752 | ||
753 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
754 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
755 | MODULE_LICENSE("GPL"); | |
756 | ||
757 | module_init(iblock_module_init); | |
758 | module_exit(iblock_module_exit); |