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 | ||
c66ac9db NB |
53 | static struct se_subsystem_api iblock_template; |
54 | ||
55 | static void iblock_bio_done(struct bio *, int); | |
56 | ||
57 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) | |
58 | * | |
59 | * | |
60 | */ | |
61 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) | |
62 | { | |
6708bb27 | 63 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
c66ac9db NB |
64 | " Generic Target Core Stack %s\n", hba->hba_id, |
65 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); | |
c66ac9db NB |
66 | return 0; |
67 | } | |
68 | ||
69 | static void iblock_detach_hba(struct se_hba *hba) | |
70 | { | |
c66ac9db NB |
71 | } |
72 | ||
73 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) | |
74 | { | |
75 | struct iblock_dev *ib_dev = NULL; | |
c66ac9db NB |
76 | |
77 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); | |
6708bb27 AG |
78 | if (!ib_dev) { |
79 | pr_err("Unable to allocate struct iblock_dev\n"); | |
c66ac9db NB |
80 | return NULL; |
81 | } | |
c66ac9db | 82 | |
6708bb27 | 83 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
c66ac9db NB |
84 | |
85 | return ib_dev; | |
86 | } | |
87 | ||
88 | static struct se_device *iblock_create_virtdevice( | |
89 | struct se_hba *hba, | |
90 | struct se_subsystem_dev *se_dev, | |
91 | void *p) | |
92 | { | |
93 | struct iblock_dev *ib_dev = p; | |
94 | struct se_device *dev; | |
95 | struct se_dev_limits dev_limits; | |
96 | struct block_device *bd = NULL; | |
97 | struct request_queue *q; | |
98 | struct queue_limits *limits; | |
99 | u32 dev_flags = 0; | |
44bfd018 | 100 | fmode_t mode; |
613640e4 | 101 | int ret = -EINVAL; |
c66ac9db | 102 | |
6708bb27 AG |
103 | if (!ib_dev) { |
104 | pr_err("Unable to locate struct iblock_dev parameter\n"); | |
613640e4 | 105 | return ERR_PTR(ret); |
c66ac9db NB |
106 | } |
107 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
d5b4a21b CH |
108 | |
109 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); | |
6708bb27 AG |
110 | if (!ib_dev->ibd_bio_set) { |
111 | pr_err("IBLOCK: Unable to create bioset()\n"); | |
613640e4 | 112 | return ERR_PTR(-ENOMEM); |
c66ac9db | 113 | } |
6708bb27 | 114 | pr_debug("IBLOCK: Created bio_set()\n"); |
c66ac9db NB |
115 | /* |
116 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path | |
117 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. | |
118 | */ | |
6708bb27 | 119 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
c66ac9db NB |
120 | ib_dev->ibd_udev_path); |
121 | ||
44bfd018 AG |
122 | mode = FMODE_READ|FMODE_EXCL; |
123 | if (!ib_dev->ibd_readonly) | |
124 | mode |= FMODE_WRITE; | |
125 | ||
126 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); | |
613640e4 NB |
127 | if (IS_ERR(bd)) { |
128 | ret = PTR_ERR(bd); | |
c66ac9db | 129 | goto failed; |
613640e4 | 130 | } |
c66ac9db NB |
131 | /* |
132 | * Setup the local scope queue_limits from struct request_queue->limits | |
133 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
134 | */ | |
135 | q = bdev_get_queue(bd); | |
136 | limits = &dev_limits.limits; | |
137 | limits->logical_block_size = bdev_logical_block_size(bd); | |
d5b4a21b CH |
138 | limits->max_hw_sectors = UINT_MAX; |
139 | limits->max_sectors = UINT_MAX; | |
8f3d14e2 NB |
140 | dev_limits.hw_queue_depth = q->nr_requests; |
141 | dev_limits.queue_depth = q->nr_requests; | |
c66ac9db | 142 | |
c66ac9db NB |
143 | ib_dev->ibd_bd = bd; |
144 | ||
145 | dev = transport_add_device_to_core_hba(hba, | |
5951146d | 146 | &iblock_template, se_dev, dev_flags, ib_dev, |
c66ac9db | 147 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
6708bb27 | 148 | if (!dev) |
c66ac9db NB |
149 | goto failed; |
150 | ||
c66ac9db NB |
151 | /* |
152 | * Check if the underlying struct block_device request_queue supports | |
153 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM | |
154 | * in ATA and we need to set TPE=1 | |
155 | */ | |
613640e4 | 156 | if (blk_queue_discard(q)) { |
e3d6f909 | 157 | dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
c66ac9db NB |
158 | q->limits.max_discard_sectors; |
159 | /* | |
160 | * Currently hardcoded to 1 in Linux/SCSI code.. | |
161 | */ | |
e3d6f909 AG |
162 | dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; |
163 | dev->se_sub_dev->se_dev_attrib.unmap_granularity = | |
7347b5ff | 164 | q->limits.discard_granularity >> 9; |
e3d6f909 | 165 | dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
c66ac9db NB |
166 | q->limits.discard_alignment; |
167 | ||
6708bb27 | 168 | pr_debug("IBLOCK: BLOCK Discard support available," |
c66ac9db NB |
169 | " disabled by default\n"); |
170 | } | |
171 | ||
e22a7f07 RD |
172 | if (blk_queue_nonrot(q)) |
173 | dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; | |
174 | ||
c66ac9db NB |
175 | return dev; |
176 | ||
177 | failed: | |
178 | if (ib_dev->ibd_bio_set) { | |
179 | bioset_free(ib_dev->ibd_bio_set); | |
180 | ib_dev->ibd_bio_set = NULL; | |
181 | } | |
182 | ib_dev->ibd_bd = NULL; | |
613640e4 | 183 | return ERR_PTR(ret); |
c66ac9db NB |
184 | } |
185 | ||
186 | static void iblock_free_device(void *p) | |
187 | { | |
188 | struct iblock_dev *ib_dev = p; | |
189 | ||
bc665524 NB |
190 | if (ib_dev->ibd_bd != NULL) |
191 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); | |
192 | if (ib_dev->ibd_bio_set != NULL) | |
193 | bioset_free(ib_dev->ibd_bio_set); | |
c66ac9db NB |
194 | kfree(ib_dev); |
195 | } | |
196 | ||
c66ac9db NB |
197 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
198 | struct se_device *dev, | |
199 | struct block_device *bd, | |
200 | struct request_queue *q) | |
201 | { | |
202 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), | |
203 | bdev_logical_block_size(bd)) - 1); | |
204 | u32 block_size = bdev_logical_block_size(bd); | |
205 | ||
e3d6f909 | 206 | if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
c66ac9db NB |
207 | return blocks_long; |
208 | ||
209 | switch (block_size) { | |
210 | case 4096: | |
e3d6f909 | 211 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
212 | case 2048: |
213 | blocks_long <<= 1; | |
214 | break; | |
215 | case 1024: | |
216 | blocks_long <<= 2; | |
217 | break; | |
218 | case 512: | |
219 | blocks_long <<= 3; | |
220 | default: | |
221 | break; | |
222 | } | |
223 | break; | |
224 | case 2048: | |
e3d6f909 | 225 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
226 | case 4096: |
227 | blocks_long >>= 1; | |
228 | break; | |
229 | case 1024: | |
230 | blocks_long <<= 1; | |
231 | break; | |
232 | case 512: | |
233 | blocks_long <<= 2; | |
234 | break; | |
235 | default: | |
236 | break; | |
237 | } | |
238 | break; | |
239 | case 1024: | |
e3d6f909 | 240 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
241 | case 4096: |
242 | blocks_long >>= 2; | |
243 | break; | |
244 | case 2048: | |
245 | blocks_long >>= 1; | |
246 | break; | |
247 | case 512: | |
248 | blocks_long <<= 1; | |
249 | break; | |
250 | default: | |
251 | break; | |
252 | } | |
253 | break; | |
254 | case 512: | |
e3d6f909 | 255 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
c66ac9db NB |
256 | case 4096: |
257 | blocks_long >>= 3; | |
258 | break; | |
259 | case 2048: | |
260 | blocks_long >>= 2; | |
261 | break; | |
262 | case 1024: | |
263 | blocks_long >>= 1; | |
264 | break; | |
265 | default: | |
266 | break; | |
267 | } | |
268 | break; | |
269 | default: | |
270 | break; | |
271 | } | |
272 | ||
273 | return blocks_long; | |
274 | } | |
275 | ||
df5fa691 CH |
276 | static void iblock_end_io_flush(struct bio *bio, int err) |
277 | { | |
278 | struct se_cmd *cmd = bio->bi_private; | |
279 | ||
280 | if (err) | |
281 | pr_err("IBLOCK: cache flush failed: %d\n", err); | |
282 | ||
5787cacd CH |
283 | if (cmd) { |
284 | if (err) { | |
285 | cmd->scsi_sense_reason = | |
286 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
287 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); | |
288 | } else { | |
289 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
290 | } | |
291 | } | |
292 | ||
df5fa691 CH |
293 | bio_put(bio); |
294 | } | |
295 | ||
c66ac9db | 296 | /* |
df5fa691 CH |
297 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
298 | * always flush the whole cache. | |
c66ac9db | 299 | */ |
ad67f0d9 | 300 | static int iblock_execute_sync_cache(struct se_cmd *cmd) |
c66ac9db | 301 | { |
c66ac9db | 302 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
a1d8b49a | 303 | int immed = (cmd->t_task_cdb[1] & 0x2); |
df5fa691 | 304 | struct bio *bio; |
c66ac9db NB |
305 | |
306 | /* | |
307 | * If the Immediate bit is set, queue up the GOOD response | |
df5fa691 | 308 | * for this SYNCHRONIZE_CACHE op. |
c66ac9db NB |
309 | */ |
310 | if (immed) | |
5787cacd | 311 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db | 312 | |
df5fa691 CH |
313 | bio = bio_alloc(GFP_KERNEL, 0); |
314 | bio->bi_end_io = iblock_end_io_flush; | |
315 | bio->bi_bdev = ib_dev->ibd_bd; | |
c66ac9db | 316 | if (!immed) |
df5fa691 CH |
317 | bio->bi_private = cmd; |
318 | submit_bio(WRITE_FLUSH, bio); | |
ad67f0d9 | 319 | return 0; |
c66ac9db NB |
320 | } |
321 | ||
14150a6b | 322 | static int iblock_execute_unmap(struct se_cmd *cmd) |
c66ac9db | 323 | { |
14150a6b | 324 | struct se_device *dev = cmd->se_dev; |
c66ac9db | 325 | struct iblock_dev *ibd = dev->dev_ptr; |
14150a6b | 326 | unsigned char *buf, *ptr = NULL; |
14150a6b | 327 | sector_t lba; |
0d7f1299 | 328 | int size; |
b7fc7f37 RD |
329 | u32 range; |
330 | int ret = 0; | |
331 | int dl, bd_dl; | |
14150a6b | 332 | |
0d7f1299 PB |
333 | if (cmd->data_length < 8) { |
334 | pr_warn("UNMAP parameter list length %u too small\n", | |
335 | cmd->data_length); | |
336 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
337 | return -EINVAL; | |
338 | } | |
339 | ||
14150a6b CH |
340 | buf = transport_kmap_data_sg(cmd); |
341 | ||
1a5fa457 RD |
342 | dl = get_unaligned_be16(&buf[0]); |
343 | bd_dl = get_unaligned_be16(&buf[2]); | |
344 | ||
0d7f1299 PB |
345 | size = cmd->data_length - 8; |
346 | if (bd_dl > size) | |
347 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
348 | cmd->data_length, bd_dl); | |
349 | else | |
350 | size = bd_dl; | |
351 | ||
7409a665 RD |
352 | if (size / 16 > dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) { |
353 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
354 | ret = -EINVAL; | |
355 | goto err; | |
356 | } | |
b7fc7f37 RD |
357 | |
358 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
359 | ptr = &buf[8]; | |
360 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
14150a6b CH |
361 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
362 | ||
b7fc7f37 | 363 | while (size >= 16) { |
14150a6b CH |
364 | lba = get_unaligned_be64(&ptr[0]); |
365 | range = get_unaligned_be32(&ptr[8]); | |
366 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
367 | (unsigned long long)lba, range); | |
368 | ||
2594e298 RD |
369 | if (range > dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count) { |
370 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; | |
371 | ret = -EINVAL; | |
372 | goto err; | |
373 | } | |
374 | ||
375 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
376 | cmd->scsi_sense_reason = TCM_ADDRESS_OUT_OF_RANGE; | |
377 | ret = -EINVAL; | |
378 | goto err; | |
379 | } | |
380 | ||
14150a6b CH |
381 | ret = blkdev_issue_discard(ibd->ibd_bd, lba, range, |
382 | GFP_KERNEL, 0); | |
383 | if (ret < 0) { | |
384 | pr_err("blkdev_issue_discard() failed: %d\n", | |
385 | ret); | |
386 | goto err; | |
387 | } | |
388 | ||
389 | ptr += 16; | |
390 | size -= 16; | |
391 | } | |
c66ac9db | 392 | |
14150a6b CH |
393 | err: |
394 | transport_kunmap_data_sg(cmd); | |
395 | if (!ret) | |
396 | target_complete_cmd(cmd, GOOD); | |
397 | return ret; | |
c66ac9db NB |
398 | } |
399 | ||
6f974e8c CH |
400 | static int iblock_execute_write_same(struct se_cmd *cmd) |
401 | { | |
402 | struct iblock_dev *ibd = cmd->se_dev->dev_ptr; | |
403 | int ret; | |
404 | ||
405 | ret = blkdev_issue_discard(ibd->ibd_bd, cmd->t_task_lba, | |
406 | spc_get_write_same_sectors(cmd), GFP_KERNEL, | |
407 | 0); | |
408 | if (ret < 0) { | |
409 | pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n"); | |
410 | return ret; | |
411 | } | |
412 | ||
413 | target_complete_cmd(cmd, GOOD); | |
414 | return 0; | |
415 | } | |
416 | ||
c66ac9db | 417 | enum { |
44bfd018 | 418 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
c66ac9db NB |
419 | }; |
420 | ||
421 | static match_table_t tokens = { | |
422 | {Opt_udev_path, "udev_path=%s"}, | |
44bfd018 | 423 | {Opt_readonly, "readonly=%d"}, |
c66ac9db NB |
424 | {Opt_force, "force=%d"}, |
425 | {Opt_err, NULL} | |
426 | }; | |
427 | ||
428 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, | |
429 | struct se_subsystem_dev *se_dev, | |
430 | const char *page, ssize_t count) | |
431 | { | |
432 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; | |
6d180253 | 433 | char *orig, *ptr, *arg_p, *opts; |
c66ac9db | 434 | substring_t args[MAX_OPT_ARGS]; |
21bca31c | 435 | int ret = 0, token; |
44bfd018 | 436 | unsigned long tmp_readonly; |
c66ac9db NB |
437 | |
438 | opts = kstrdup(page, GFP_KERNEL); | |
439 | if (!opts) | |
440 | return -ENOMEM; | |
441 | ||
442 | orig = opts; | |
443 | ||
90c161b6 | 444 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
445 | if (!*ptr) |
446 | continue; | |
447 | ||
448 | token = match_token(ptr, tokens, args); | |
449 | switch (token) { | |
450 | case Opt_udev_path: | |
451 | if (ib_dev->ibd_bd) { | |
6708bb27 | 452 | pr_err("Unable to set udev_path= while" |
c66ac9db NB |
453 | " ib_dev->ibd_bd exists\n"); |
454 | ret = -EEXIST; | |
455 | goto out; | |
456 | } | |
6d180253 JJ |
457 | arg_p = match_strdup(&args[0]); |
458 | if (!arg_p) { | |
459 | ret = -ENOMEM; | |
460 | break; | |
461 | } | |
462 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, | |
463 | "%s", arg_p); | |
464 | kfree(arg_p); | |
6708bb27 | 465 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
c66ac9db NB |
466 | ib_dev->ibd_udev_path); |
467 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; | |
468 | break; | |
44bfd018 AG |
469 | case Opt_readonly: |
470 | arg_p = match_strdup(&args[0]); | |
471 | if (!arg_p) { | |
472 | ret = -ENOMEM; | |
473 | break; | |
474 | } | |
475 | ret = strict_strtoul(arg_p, 0, &tmp_readonly); | |
476 | kfree(arg_p); | |
477 | if (ret < 0) { | |
478 | pr_err("strict_strtoul() failed for" | |
479 | " readonly=\n"); | |
480 | goto out; | |
481 | } | |
482 | ib_dev->ibd_readonly = tmp_readonly; | |
483 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); | |
484 | break; | |
c66ac9db | 485 | case Opt_force: |
c66ac9db NB |
486 | break; |
487 | default: | |
488 | break; | |
489 | } | |
490 | } | |
491 | ||
492 | out: | |
493 | kfree(orig); | |
494 | return (!ret) ? count : ret; | |
495 | } | |
496 | ||
497 | static ssize_t iblock_check_configfs_dev_params( | |
498 | struct se_hba *hba, | |
499 | struct se_subsystem_dev *se_dev) | |
500 | { | |
501 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
502 | ||
503 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { | |
6708bb27 | 504 | pr_err("Missing udev_path= parameters for IBLOCK\n"); |
e3d6f909 | 505 | return -EINVAL; |
c66ac9db NB |
506 | } |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static ssize_t iblock_show_configfs_dev_params( | |
512 | struct se_hba *hba, | |
513 | struct se_subsystem_dev *se_dev, | |
514 | char *b) | |
515 | { | |
516 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; | |
517 | struct block_device *bd = ibd->ibd_bd; | |
518 | char buf[BDEVNAME_SIZE]; | |
519 | ssize_t bl = 0; | |
520 | ||
521 | if (bd) | |
522 | bl += sprintf(b + bl, "iBlock device: %s", | |
523 | bdevname(bd, buf)); | |
44bfd018 AG |
524 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) |
525 | bl += sprintf(b + bl, " UDEV PATH: %s", | |
c66ac9db | 526 | ibd->ibd_udev_path); |
44bfd018 | 527 | bl += sprintf(b + bl, " readonly: %d\n", ibd->ibd_readonly); |
c66ac9db NB |
528 | |
529 | bl += sprintf(b + bl, " "); | |
530 | if (bd) { | |
531 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", | |
21bca31c | 532 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
8359cf43 | 533 | "" : (bd->bd_holder == ibd) ? |
c66ac9db NB |
534 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
535 | } else { | |
21bca31c | 536 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
c66ac9db NB |
537 | } |
538 | ||
539 | return bl; | |
540 | } | |
541 | ||
5787cacd CH |
542 | static void iblock_complete_cmd(struct se_cmd *cmd) |
543 | { | |
544 | struct iblock_req *ibr = cmd->priv; | |
545 | u8 status; | |
546 | ||
547 | if (!atomic_dec_and_test(&ibr->pending)) | |
548 | return; | |
549 | ||
550 | if (atomic_read(&ibr->ib_bio_err_cnt)) | |
551 | status = SAM_STAT_CHECK_CONDITION; | |
552 | else | |
553 | status = SAM_STAT_GOOD; | |
554 | ||
555 | target_complete_cmd(cmd, status); | |
556 | kfree(ibr); | |
557 | } | |
558 | ||
c66ac9db NB |
559 | static void iblock_bio_destructor(struct bio *bio) |
560 | { | |
5787cacd CH |
561 | struct se_cmd *cmd = bio->bi_private; |
562 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; | |
c66ac9db NB |
563 | |
564 | bio_free(bio, ib_dev->ibd_bio_set); | |
565 | } | |
566 | ||
dbbf3e94 | 567 | static struct bio * |
5787cacd | 568 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) |
c66ac9db | 569 | { |
5787cacd | 570 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
c66ac9db NB |
571 | struct bio *bio; |
572 | ||
5c55125f CH |
573 | /* |
574 | * Only allocate as many vector entries as the bio code allows us to, | |
575 | * we'll loop later on until we have handled the whole request. | |
576 | */ | |
577 | if (sg_num > BIO_MAX_PAGES) | |
578 | sg_num = BIO_MAX_PAGES; | |
579 | ||
c66ac9db | 580 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
6708bb27 AG |
581 | if (!bio) { |
582 | pr_err("Unable to allocate memory for bio\n"); | |
c66ac9db NB |
583 | return NULL; |
584 | } | |
585 | ||
c66ac9db | 586 | bio->bi_bdev = ib_dev->ibd_bd; |
5787cacd | 587 | bio->bi_private = cmd; |
c66ac9db NB |
588 | bio->bi_destructor = iblock_bio_destructor; |
589 | bio->bi_end_io = &iblock_bio_done; | |
590 | bio->bi_sector = lba; | |
c66ac9db NB |
591 | return bio; |
592 | } | |
593 | ||
d5b4a21b CH |
594 | static void iblock_submit_bios(struct bio_list *list, int rw) |
595 | { | |
596 | struct blk_plug plug; | |
597 | struct bio *bio; | |
598 | ||
599 | blk_start_plug(&plug); | |
600 | while ((bio = bio_list_pop(list))) | |
601 | submit_bio(rw, bio); | |
602 | blk_finish_plug(&plug); | |
603 | } | |
604 | ||
0c2ad7d1 | 605 | static int iblock_execute_rw(struct se_cmd *cmd) |
c66ac9db | 606 | { |
0c2ad7d1 CH |
607 | struct scatterlist *sgl = cmd->t_data_sg; |
608 | u32 sgl_nents = cmd->t_data_nents; | |
609 | enum dma_data_direction data_direction = cmd->data_direction; | |
5951146d | 610 | struct se_device *dev = cmd->se_dev; |
5787cacd | 611 | struct iblock_req *ibr; |
dbbf3e94 CH |
612 | struct bio *bio; |
613 | struct bio_list list; | |
c66ac9db | 614 | struct scatterlist *sg; |
5787cacd | 615 | u32 sg_num = sgl_nents; |
c66ac9db | 616 | sector_t block_lba; |
d5b4a21b | 617 | unsigned bio_cnt; |
dbbf3e94 | 618 | int rw; |
5787cacd | 619 | int i; |
dbbf3e94 | 620 | |
5787cacd | 621 | if (data_direction == DMA_TO_DEVICE) { |
dbbf3e94 CH |
622 | /* |
623 | * Force data to disk if we pretend to not have a volatile | |
624 | * write cache, or the initiator set the Force Unit Access bit. | |
625 | */ | |
626 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || | |
627 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && | |
2d3a4b51 | 628 | (cmd->se_cmd_flags & SCF_FUA))) |
dbbf3e94 CH |
629 | rw = WRITE_FUA; |
630 | else | |
631 | rw = WRITE; | |
632 | } else { | |
633 | rw = READ; | |
634 | } | |
635 | ||
c66ac9db | 636 | /* |
5787cacd CH |
637 | * Convert the blocksize advertised to the initiator to the 512 byte |
638 | * units unconditionally used by the Linux block layer. | |
c66ac9db | 639 | */ |
e3d6f909 | 640 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
72a0e5e2 | 641 | block_lba = (cmd->t_task_lba << 3); |
e3d6f909 | 642 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
72a0e5e2 | 643 | block_lba = (cmd->t_task_lba << 2); |
e3d6f909 | 644 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
72a0e5e2 | 645 | block_lba = (cmd->t_task_lba << 1); |
e3d6f909 | 646 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
72a0e5e2 | 647 | block_lba = cmd->t_task_lba; |
c66ac9db | 648 | else { |
6708bb27 | 649 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
e3d6f909 | 650 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
03e98c9e NB |
651 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
652 | return -ENOSYS; | |
c66ac9db NB |
653 | } |
654 | ||
5787cacd CH |
655 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
656 | if (!ibr) | |
657 | goto fail; | |
658 | cmd->priv = ibr; | |
659 | ||
660 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); | |
661 | if (!bio) | |
662 | goto fail_free_ibr; | |
dbbf3e94 CH |
663 | |
664 | bio_list_init(&list); | |
665 | bio_list_add(&list, bio); | |
5787cacd CH |
666 | |
667 | atomic_set(&ibr->pending, 2); | |
d5b4a21b | 668 | bio_cnt = 1; |
c66ac9db | 669 | |
5787cacd | 670 | for_each_sg(sgl, sg, sgl_nents, i) { |
dbbf3e94 CH |
671 | /* |
672 | * XXX: if the length the device accepts is shorter than the | |
673 | * length of the S/G list entry this will cause and | |
674 | * endless loop. Better hope no driver uses huge pages. | |
675 | */ | |
676 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) | |
677 | != sg->length) { | |
d5b4a21b CH |
678 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
679 | iblock_submit_bios(&list, rw); | |
680 | bio_cnt = 0; | |
681 | } | |
682 | ||
5787cacd | 683 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
6708bb27 | 684 | if (!bio) |
5787cacd CH |
685 | goto fail_put_bios; |
686 | ||
687 | atomic_inc(&ibr->pending); | |
dbbf3e94 | 688 | bio_list_add(&list, bio); |
d5b4a21b | 689 | bio_cnt++; |
c66ac9db | 690 | } |
dbbf3e94 | 691 | |
c66ac9db NB |
692 | /* Always in 512 byte units for Linux/Block */ |
693 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; | |
694 | sg_num--; | |
c66ac9db NB |
695 | } |
696 | ||
d5b4a21b | 697 | iblock_submit_bios(&list, rw); |
5787cacd | 698 | iblock_complete_cmd(cmd); |
03e98c9e | 699 | return 0; |
dbbf3e94 | 700 | |
5787cacd | 701 | fail_put_bios: |
dbbf3e94 | 702 | while ((bio = bio_list_pop(&list))) |
c66ac9db | 703 | bio_put(bio); |
5787cacd CH |
704 | fail_free_ibr: |
705 | kfree(ibr); | |
03e98c9e | 706 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
5787cacd | 707 | fail: |
03e98c9e | 708 | return -ENOMEM; |
c66ac9db NB |
709 | } |
710 | ||
c66ac9db NB |
711 | static u32 iblock_get_device_rev(struct se_device *dev) |
712 | { | |
713 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
714 | } | |
715 | ||
716 | static u32 iblock_get_device_type(struct se_device *dev) | |
717 | { | |
718 | return TYPE_DISK; | |
719 | } | |
720 | ||
721 | static sector_t iblock_get_blocks(struct se_device *dev) | |
722 | { | |
723 | struct iblock_dev *ibd = dev->dev_ptr; | |
724 | struct block_device *bd = ibd->ibd_bd; | |
725 | struct request_queue *q = bdev_get_queue(bd); | |
726 | ||
727 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); | |
728 | } | |
729 | ||
730 | static void iblock_bio_done(struct bio *bio, int err) | |
731 | { | |
5787cacd CH |
732 | struct se_cmd *cmd = bio->bi_private; |
733 | struct iblock_req *ibr = cmd->priv; | |
dbbf3e94 | 734 | |
c66ac9db NB |
735 | /* |
736 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 | |
737 | */ | |
6708bb27 | 738 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
c66ac9db NB |
739 | err = -EIO; |
740 | ||
741 | if (err != 0) { | |
6708bb27 | 742 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
c66ac9db NB |
743 | " err: %d\n", bio, err); |
744 | /* | |
745 | * Bump the ib_bio_err_cnt and release bio. | |
746 | */ | |
747 | atomic_inc(&ibr->ib_bio_err_cnt); | |
748 | smp_mb__after_atomic_inc(); | |
c66ac9db | 749 | } |
dbbf3e94 | 750 | |
c66ac9db | 751 | bio_put(bio); |
dbbf3e94 | 752 | |
5787cacd | 753 | iblock_complete_cmd(cmd); |
c66ac9db NB |
754 | } |
755 | ||
0c2ad7d1 CH |
756 | static struct spc_ops iblock_spc_ops = { |
757 | .execute_rw = iblock_execute_rw, | |
ad67f0d9 | 758 | .execute_sync_cache = iblock_execute_sync_cache, |
6f974e8c | 759 | .execute_write_same = iblock_execute_write_same, |
14150a6b | 760 | .execute_unmap = iblock_execute_unmap, |
0c2ad7d1 CH |
761 | }; |
762 | ||
763 | static int iblock_parse_cdb(struct se_cmd *cmd) | |
764 | { | |
765 | return sbc_parse_cdb(cmd, &iblock_spc_ops); | |
766 | } | |
767 | ||
c66ac9db NB |
768 | static struct se_subsystem_api iblock_template = { |
769 | .name = "iblock", | |
770 | .owner = THIS_MODULE, | |
771 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
772 | .write_cache_emulated = 1, |
773 | .fua_write_emulated = 1, | |
c66ac9db NB |
774 | .attach_hba = iblock_attach_hba, |
775 | .detach_hba = iblock_detach_hba, | |
776 | .allocate_virtdevice = iblock_allocate_virtdevice, | |
777 | .create_virtdevice = iblock_create_virtdevice, | |
778 | .free_device = iblock_free_device, | |
0c2ad7d1 | 779 | .parse_cdb = iblock_parse_cdb, |
c66ac9db NB |
780 | .check_configfs_dev_params = iblock_check_configfs_dev_params, |
781 | .set_configfs_dev_params = iblock_set_configfs_dev_params, | |
782 | .show_configfs_dev_params = iblock_show_configfs_dev_params, | |
c66ac9db NB |
783 | .get_device_rev = iblock_get_device_rev, |
784 | .get_device_type = iblock_get_device_type, | |
785 | .get_blocks = iblock_get_blocks, | |
786 | }; | |
787 | ||
788 | static int __init iblock_module_init(void) | |
789 | { | |
790 | return transport_subsystem_register(&iblock_template); | |
791 | } | |
792 | ||
793 | static void iblock_module_exit(void) | |
794 | { | |
795 | transport_subsystem_release(&iblock_template); | |
796 | } | |
797 | ||
798 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); | |
799 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
800 | MODULE_LICENSE("GPL"); | |
801 | ||
802 | module_init(iblock_module_init); | |
803 | module_exit(iblock_module_exit); |