Commit | Line | Data |
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d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
d6e0175c CH |
5 | * |
6 | * Nicholas A. Bellinger <nab@kernel.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/ratelimit.h> | |
26 | #include <asm/unaligned.h> | |
27 | #include <scsi/scsi.h> | |
68ff9b9b | 28 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
29 | |
30 | #include <target/target_core_base.h> | |
31 | #include <target/target_core_backend.h> | |
32 | #include <target/target_core_fabric.h> | |
33 | ||
34 | #include "target_core_internal.h" | |
35 | #include "target_core_ua.h" | |
36 | ||
37 | ||
de103c93 CH |
38 | static sense_reason_t |
39 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
40 | { |
41 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 42 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 43 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
44 | unsigned char *rbuf; |
45 | unsigned char buf[8]; | |
1fd032ee CH |
46 | u32 blocks; |
47 | ||
8dc8632a RD |
48 | /* |
49 | * SBC-2 says: | |
50 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
51 | * ADDRESS field is not set to zero, the device server shall | |
52 | * terminate the command with CHECK CONDITION status with | |
53 | * the sense key set to ILLEGAL REQUEST and the additional | |
54 | * sense code set to INVALID FIELD IN CDB. | |
55 | * | |
56 | * In SBC-3, these fields are obsolete, but some SCSI | |
57 | * compliance tests actually check this, so we might as well | |
58 | * follow SBC-2. | |
59 | */ | |
60 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
61 | return TCM_INVALID_CDB_FIELD; | |
62 | ||
1fd032ee CH |
63 | if (blocks_long >= 0x00000000ffffffff) |
64 | blocks = 0xffffffff; | |
65 | else | |
66 | blocks = (u32)blocks_long; | |
67 | ||
1fd032ee CH |
68 | buf[0] = (blocks >> 24) & 0xff; |
69 | buf[1] = (blocks >> 16) & 0xff; | |
70 | buf[2] = (blocks >> 8) & 0xff; | |
71 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
72 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
73 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
74 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
75 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 76 | |
a50da144 | 77 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
78 | if (rbuf) { |
79 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
80 | transport_kunmap_data_sg(cmd); | |
81 | } | |
1fd032ee CH |
82 | |
83 | target_complete_cmd(cmd, GOOD); | |
84 | return 0; | |
85 | } | |
86 | ||
de103c93 CH |
87 | static sense_reason_t |
88 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
89 | { |
90 | struct se_device *dev = cmd->se_dev; | |
a50da144 PB |
91 | unsigned char *rbuf; |
92 | unsigned char buf[32]; | |
1fd032ee CH |
93 | unsigned long long blocks = dev->transport->get_blocks(dev); |
94 | ||
a50da144 | 95 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
96 | buf[0] = (blocks >> 56) & 0xff; |
97 | buf[1] = (blocks >> 48) & 0xff; | |
98 | buf[2] = (blocks >> 40) & 0xff; | |
99 | buf[3] = (blocks >> 32) & 0xff; | |
100 | buf[4] = (blocks >> 24) & 0xff; | |
101 | buf[5] = (blocks >> 16) & 0xff; | |
102 | buf[6] = (blocks >> 8) & 0xff; | |
103 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
104 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
105 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
106 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
107 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee CH |
108 | /* |
109 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
110 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
111 | */ | |
0fd97ccf | 112 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
1fd032ee CH |
113 | buf[14] = 0x80; |
114 | ||
a50da144 | 115 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
116 | if (rbuf) { |
117 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
118 | transport_kunmap_data_sg(cmd); | |
119 | } | |
1fd032ee CH |
120 | |
121 | target_complete_cmd(cmd, GOOD); | |
122 | return 0; | |
123 | } | |
124 | ||
972b29c8 | 125 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 126 | { |
1fd032ee | 127 | u32 num_blocks; |
1fd032ee CH |
128 | |
129 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
130 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
131 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
132 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
133 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
134 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
135 | ||
136 | /* | |
137 | * Use the explicit range when non zero is supplied, otherwise calculate | |
138 | * the remaining range based on ->get_blocks() - starting LBA. | |
139 | */ | |
6f974e8c CH |
140 | if (num_blocks) |
141 | return num_blocks; | |
1fd032ee | 142 | |
6f974e8c CH |
143 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
144 | cmd->t_task_lba + 1; | |
1fd032ee | 145 | } |
972b29c8 | 146 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 147 | |
de103c93 | 148 | static sense_reason_t |
1920ed61 | 149 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
150 | { |
151 | target_complete_cmd(cmd, GOOD); | |
152 | return 0; | |
153 | } | |
154 | ||
d6e0175c CH |
155 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
156 | { | |
0fd97ccf | 157 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
158 | } |
159 | ||
160 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
161 | { | |
162 | struct se_device *dev = cmd->se_dev; | |
163 | unsigned long long end_lba; | |
164 | u32 sectors; | |
165 | ||
0fd97ccf | 166 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
d6e0175c CH |
167 | end_lba = dev->transport->get_blocks(dev) + 1; |
168 | ||
169 | if (cmd->t_task_lba + sectors > end_lba) { | |
170 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
171 | cmd->t_task_lba, sectors, end_lba); | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
179 | { | |
180 | /* | |
181 | * Use 8-bit sector value. SBC-3 says: | |
182 | * | |
183 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
184 | * logical blocks shall be written. Any other value | |
185 | * specifies the number of logical blocks that shall be | |
186 | * written. | |
187 | */ | |
188 | return cdb[4] ? : 256; | |
189 | } | |
190 | ||
191 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
192 | { | |
193 | return (u32)(cdb[7] << 8) + cdb[8]; | |
194 | } | |
195 | ||
196 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
197 | { | |
198 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
199 | } | |
200 | ||
201 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
202 | { | |
203 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
204 | (cdb[12] << 8) + cdb[13]; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
209 | */ | |
210 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
211 | { | |
212 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
213 | (cdb[30] << 8) + cdb[31]; | |
214 | ||
215 | } | |
216 | ||
217 | static inline u32 transport_lba_21(unsigned char *cdb) | |
218 | { | |
219 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
220 | } | |
221 | ||
222 | static inline u32 transport_lba_32(unsigned char *cdb) | |
223 | { | |
224 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
225 | } | |
226 | ||
227 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
228 | { | |
229 | unsigned int __v1, __v2; | |
230 | ||
231 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
232 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
233 | ||
234 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
235 | } | |
236 | ||
237 | /* | |
238 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
239 | */ | |
240 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
241 | { | |
242 | unsigned int __v1, __v2; | |
243 | ||
244 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
245 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
246 | ||
247 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
248 | } | |
249 | ||
cd063bef NB |
250 | static sense_reason_t |
251 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 252 | { |
972b29c8 | 253 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
773cbaf7 | 254 | |
d6e0175c CH |
255 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
256 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
257 | " bits not supported for Block Discard" | |
258 | " Emulation\n"); | |
cd063bef | 259 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 260 | } |
773cbaf7 NB |
261 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
262 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
263 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
264 | return TCM_INVALID_CDB_FIELD; | |
265 | } | |
d6e0175c | 266 | /* |
cd063bef NB |
267 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
268 | * translated into block discard requests within backend code. | |
d6e0175c | 269 | */ |
cd063bef NB |
270 | if (flags[0] & 0x08) { |
271 | if (!ops->execute_write_same_unmap) | |
272 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
273 | ||
274 | cmd->execute_cmd = ops->execute_write_same_unmap; | |
275 | return 0; | |
d6e0175c | 276 | } |
cd063bef NB |
277 | if (!ops->execute_write_same) |
278 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 279 | |
cd063bef | 280 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
281 | return 0; |
282 | } | |
283 | ||
a6b0133c | 284 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
285 | { |
286 | unsigned char *buf, *addr; | |
287 | struct scatterlist *sg; | |
288 | unsigned int offset; | |
a6b0133c NB |
289 | sense_reason_t ret = TCM_NO_SENSE; |
290 | int i, count; | |
d6e0175c CH |
291 | /* |
292 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
293 | * | |
294 | * 1) read the specified logical block(s); | |
295 | * 2) transfer logical blocks from the data-out buffer; | |
296 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
297 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
298 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
299 | * blocks transferred from the data-out buffer; and | |
300 | * 5) transfer the resulting XOR data to the data-in buffer. | |
301 | */ | |
302 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
303 | if (!buf) { | |
304 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 305 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
306 | } |
307 | /* | |
308 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
309 | * into the locally allocated *buf | |
310 | */ | |
311 | sg_copy_to_buffer(cmd->t_data_sg, | |
312 | cmd->t_data_nents, | |
313 | buf, | |
314 | cmd->data_length); | |
315 | ||
316 | /* | |
317 | * Now perform the XOR against the BIDI read memory located at | |
318 | * cmd->t_mem_bidi_list | |
319 | */ | |
320 | ||
321 | offset = 0; | |
322 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
323 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
324 | if (!addr) { |
325 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 326 | goto out; |
a6b0133c | 327 | } |
d6e0175c CH |
328 | |
329 | for (i = 0; i < sg->length; i++) | |
330 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
331 | ||
332 | offset += sg->length; | |
333 | kunmap_atomic(addr); | |
334 | } | |
335 | ||
336 | out: | |
337 | kfree(buf); | |
a6b0133c | 338 | return ret; |
d6e0175c CH |
339 | } |
340 | ||
a82a9538 NB |
341 | static sense_reason_t |
342 | sbc_execute_rw(struct se_cmd *cmd) | |
343 | { | |
344 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
345 | cmd->data_direction); | |
346 | } | |
347 | ||
68ff9b9b NB |
348 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
349 | { | |
350 | struct se_device *dev = cmd->se_dev; | |
351 | ||
352 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
353 | /* | |
354 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
355 | * before the original READ I/O submission. | |
356 | */ | |
357 | up(&dev->caw_sem); | |
358 | ||
359 | return TCM_NO_SENSE; | |
360 | } | |
361 | ||
362 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
363 | { | |
364 | struct se_device *dev = cmd->se_dev; | |
365 | struct scatterlist *write_sg = NULL, *sg; | |
366 | unsigned char *buf, *addr; | |
367 | struct sg_mapping_iter m; | |
368 | unsigned int offset = 0, len; | |
369 | unsigned int nlbas = cmd->t_task_nolb; | |
370 | unsigned int block_size = dev->dev_attrib.block_size; | |
371 | unsigned int compare_len = (nlbas * block_size); | |
372 | sense_reason_t ret = TCM_NO_SENSE; | |
373 | int rc, i; | |
374 | ||
cf6d1f09 NB |
375 | /* |
376 | * Handle early failure in transport_generic_request_failure(), | |
377 | * which will not have taken ->caw_mutex yet.. | |
378 | */ | |
379 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
380 | return TCM_NO_SENSE; | |
381 | ||
68ff9b9b NB |
382 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
383 | if (!buf) { | |
384 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
385 | ret = TCM_OUT_OF_RESOURCES; |
386 | goto out; | |
68ff9b9b NB |
387 | } |
388 | ||
389 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, | |
390 | GFP_KERNEL); | |
391 | if (!write_sg) { | |
392 | pr_err("Unable to allocate compare_and_write sg\n"); | |
393 | ret = TCM_OUT_OF_RESOURCES; | |
394 | goto out; | |
395 | } | |
396 | /* | |
397 | * Setup verify and write data payloads from total NumberLBAs. | |
398 | */ | |
399 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
400 | cmd->data_length); | |
401 | if (!rc) { | |
402 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
403 | ret = TCM_OUT_OF_RESOURCES; | |
404 | goto out; | |
405 | } | |
406 | /* | |
407 | * Compare against SCSI READ payload against verify payload | |
408 | */ | |
409 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
410 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
411 | if (!addr) { | |
412 | ret = TCM_OUT_OF_RESOURCES; | |
413 | goto out; | |
414 | } | |
415 | ||
416 | len = min(sg->length, compare_len); | |
417 | ||
418 | if (memcmp(addr, buf + offset, len)) { | |
419 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
420 | addr, buf + offset); | |
421 | kunmap_atomic(addr); | |
422 | goto miscompare; | |
423 | } | |
424 | kunmap_atomic(addr); | |
425 | ||
426 | offset += len; | |
427 | compare_len -= len; | |
428 | if (!compare_len) | |
429 | break; | |
430 | } | |
431 | ||
432 | i = 0; | |
433 | len = cmd->t_task_nolb * block_size; | |
434 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
435 | /* | |
436 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
437 | */ | |
438 | while (len) { | |
439 | sg_miter_next(&m); | |
440 | ||
441 | if (block_size < PAGE_SIZE) { | |
442 | sg_set_page(&write_sg[i], m.page, block_size, | |
443 | block_size); | |
444 | } else { | |
445 | sg_miter_next(&m); | |
446 | sg_set_page(&write_sg[i], m.page, block_size, | |
447 | 0); | |
448 | } | |
449 | len -= block_size; | |
450 | i++; | |
451 | } | |
452 | sg_miter_stop(&m); | |
453 | /* | |
454 | * Save the original SGL + nents values before updating to new | |
455 | * assignments, to be released in transport_free_pages() -> | |
456 | * transport_reset_sgl_orig() | |
457 | */ | |
458 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
459 | cmd->t_data_sg = write_sg; | |
460 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
461 | cmd->t_data_nents = 1; | |
462 | ||
463 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
464 | cmd->transport_complete_callback = compare_and_write_post; | |
465 | /* | |
466 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
467 | * for submitting the adjusted SGL to write instance user-data. | |
468 | */ | |
469 | cmd->execute_cmd = sbc_execute_rw; | |
470 | ||
471 | spin_lock_irq(&cmd->t_state_lock); | |
472 | cmd->t_state = TRANSPORT_PROCESSING; | |
473 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
474 | spin_unlock_irq(&cmd->t_state_lock); | |
475 | ||
476 | __target_execute_cmd(cmd); | |
477 | ||
478 | kfree(buf); | |
479 | return ret; | |
480 | ||
481 | miscompare: | |
482 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
483 | dev->transport->name); | |
484 | ret = TCM_MISCOMPARE_VERIFY; | |
485 | out: | |
486 | /* | |
487 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
488 | * sbc_compare_and_write() before the original READ I/O submission. | |
489 | */ | |
490 | up(&dev->caw_sem); | |
491 | kfree(write_sg); | |
492 | kfree(buf); | |
493 | return ret; | |
494 | } | |
495 | ||
496 | static sense_reason_t | |
497 | sbc_compare_and_write(struct se_cmd *cmd) | |
498 | { | |
499 | struct se_device *dev = cmd->se_dev; | |
500 | sense_reason_t ret; | |
501 | int rc; | |
502 | /* | |
503 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
504 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
505 | */ | |
506 | rc = down_interruptible(&dev->caw_sem); | |
507 | if ((rc != 0) || signal_pending(current)) { | |
508 | cmd->transport_complete_callback = NULL; | |
509 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
510 | } | |
b7191253 NB |
511 | /* |
512 | * Reset cmd->data_length to individual block_size in order to not | |
513 | * confuse backend drivers that depend on this value matching the | |
514 | * size of the I/O being submitted. | |
515 | */ | |
516 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
517 | |
518 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
519 | DMA_FROM_DEVICE); | |
520 | if (ret) { | |
521 | cmd->transport_complete_callback = NULL; | |
522 | up(&dev->caw_sem); | |
523 | return ret; | |
524 | } | |
525 | /* | |
526 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
527 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
528 | * of WRITE instance user-data. | |
529 | */ | |
530 | return TCM_NO_SENSE; | |
531 | } | |
532 | ||
de103c93 CH |
533 | sense_reason_t |
534 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 535 | { |
d6e0175c CH |
536 | struct se_device *dev = cmd->se_dev; |
537 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 538 | unsigned int size; |
d6e0175c | 539 | u32 sectors = 0; |
de103c93 | 540 | sense_reason_t ret; |
d6e0175c CH |
541 | |
542 | switch (cdb[0]) { | |
543 | case READ_6: | |
544 | sectors = transport_get_sectors_6(cdb); | |
545 | cmd->t_task_lba = transport_lba_21(cdb); | |
546 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
547 | cmd->execute_rw = ops->execute_rw; |
548 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
549 | break; |
550 | case READ_10: | |
551 | sectors = transport_get_sectors_10(cdb); | |
552 | cmd->t_task_lba = transport_lba_32(cdb); | |
553 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
554 | cmd->execute_rw = ops->execute_rw; |
555 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
556 | break; |
557 | case READ_12: | |
558 | sectors = transport_get_sectors_12(cdb); | |
559 | cmd->t_task_lba = transport_lba_32(cdb); | |
560 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
561 | cmd->execute_rw = ops->execute_rw; |
562 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
563 | break; |
564 | case READ_16: | |
565 | sectors = transport_get_sectors_16(cdb); | |
566 | cmd->t_task_lba = transport_lba_64(cdb); | |
567 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
568 | cmd->execute_rw = ops->execute_rw; |
569 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
570 | break; |
571 | case WRITE_6: | |
572 | sectors = transport_get_sectors_6(cdb); | |
573 | cmd->t_task_lba = transport_lba_21(cdb); | |
574 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
575 | cmd->execute_rw = ops->execute_rw; |
576 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
577 | break; |
578 | case WRITE_10: | |
579 | case WRITE_VERIFY: | |
580 | sectors = transport_get_sectors_10(cdb); | |
581 | cmd->t_task_lba = transport_lba_32(cdb); | |
582 | if (cdb[1] & 0x8) | |
583 | cmd->se_cmd_flags |= SCF_FUA; | |
584 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
585 | cmd->execute_rw = ops->execute_rw; |
586 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
587 | break; |
588 | case WRITE_12: | |
589 | sectors = transport_get_sectors_12(cdb); | |
590 | cmd->t_task_lba = transport_lba_32(cdb); | |
591 | if (cdb[1] & 0x8) | |
592 | cmd->se_cmd_flags |= SCF_FUA; | |
593 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
594 | cmd->execute_rw = ops->execute_rw; |
595 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
596 | break; |
597 | case WRITE_16: | |
598 | sectors = transport_get_sectors_16(cdb); | |
599 | cmd->t_task_lba = transport_lba_64(cdb); | |
600 | if (cdb[1] & 0x8) | |
601 | cmd->se_cmd_flags |= SCF_FUA; | |
602 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
603 | cmd->execute_rw = ops->execute_rw; |
604 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
605 | break; |
606 | case XDWRITEREAD_10: | |
de103c93 | 607 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 608 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 609 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
610 | sectors = transport_get_sectors_10(cdb); |
611 | ||
612 | cmd->t_task_lba = transport_lba_32(cdb); | |
613 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
614 | ||
615 | /* | |
616 | * Setup BIDI XOR callback to be run after I/O completion. | |
617 | */ | |
a82a9538 NB |
618 | cmd->execute_rw = ops->execute_rw; |
619 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
620 | cmd->transport_complete_callback = &xdreadwrite_callback; |
621 | if (cdb[1] & 0x8) | |
622 | cmd->se_cmd_flags |= SCF_FUA; | |
623 | break; | |
624 | case VARIABLE_LENGTH_CMD: | |
625 | { | |
626 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
627 | switch (service_action) { | |
628 | case XDWRITEREAD_32: | |
629 | sectors = transport_get_sectors_32(cdb); | |
630 | ||
631 | /* | |
632 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
633 | * XDWRITE_READ_32 logic. | |
634 | */ | |
635 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
636 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
637 | ||
638 | /* | |
639 | * Setup BIDI XOR callback to be run during after I/O | |
640 | * completion. | |
641 | */ | |
a82a9538 NB |
642 | cmd->execute_rw = ops->execute_rw; |
643 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
644 | cmd->transport_complete_callback = &xdreadwrite_callback; |
645 | if (cdb[1] & 0x8) | |
646 | cmd->se_cmd_flags |= SCF_FUA; | |
647 | break; | |
648 | case WRITE_SAME_32: | |
649 | sectors = transport_get_sectors_32(cdb); | |
650 | if (!sectors) { | |
651 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
652 | " supported\n"); | |
de103c93 | 653 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
654 | } |
655 | ||
1fd032ee | 656 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
657 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
658 | ||
cd063bef | 659 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 660 | if (ret) |
cd063bef | 661 | return ret; |
d6e0175c CH |
662 | break; |
663 | default: | |
664 | pr_err("VARIABLE_LENGTH_CMD service action" | |
665 | " 0x%04x not supported\n", service_action); | |
de103c93 | 666 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
667 | } |
668 | break; | |
669 | } | |
68ff9b9b NB |
670 | case COMPARE_AND_WRITE: |
671 | sectors = cdb[13]; | |
672 | /* | |
673 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
674 | */ | |
675 | if (sectors > 1) { | |
676 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
677 | " than 1\n", sectors); | |
678 | return TCM_INVALID_CDB_FIELD; | |
679 | } | |
680 | /* | |
681 | * Double size because we have two buffers, note that | |
682 | * zero is not an error.. | |
683 | */ | |
684 | size = 2 * sbc_get_size(cmd, sectors); | |
685 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
686 | cmd->t_task_nolb = sectors; | |
687 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
688 | cmd->execute_rw = ops->execute_rw; | |
689 | cmd->execute_cmd = sbc_compare_and_write; | |
690 | cmd->transport_complete_callback = compare_and_write_callback; | |
691 | break; | |
d6e0175c | 692 | case READ_CAPACITY: |
1fd032ee CH |
693 | size = READ_CAP_LEN; |
694 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
695 | break; |
696 | case SERVICE_ACTION_IN: | |
697 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
698 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 699 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c CH |
700 | break; |
701 | default: | |
702 | pr_err("Unsupported SA: 0x%02x\n", | |
703 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 704 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 705 | } |
1fd032ee | 706 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
707 | (cdb[12] << 8) | cdb[13]; |
708 | break; | |
709 | case SYNCHRONIZE_CACHE: | |
710 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
711 | if (!ops->execute_sync_cache) { |
712 | size = 0; | |
713 | cmd->execute_cmd = sbc_emulate_noop; | |
714 | break; | |
715 | } | |
ad67f0d9 | 716 | |
d6e0175c CH |
717 | /* |
718 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
719 | */ | |
720 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
721 | sectors = transport_get_sectors_10(cdb); | |
722 | cmd->t_task_lba = transport_lba_32(cdb); | |
723 | } else { | |
724 | sectors = transport_get_sectors_16(cdb); | |
725 | cmd->t_task_lba = transport_lba_64(cdb); | |
726 | } | |
727 | ||
1fd032ee | 728 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
729 | |
730 | /* | |
731 | * Check to ensure that LBA + Range does not exceed past end of | |
732 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
733 | */ | |
734 | if (cmd->t_task_lba || sectors) { | |
735 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 736 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 737 | } |
ad67f0d9 | 738 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
739 | break; |
740 | case UNMAP: | |
14150a6b | 741 | if (!ops->execute_unmap) |
de103c93 | 742 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 743 | |
1fd032ee | 744 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 745 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
746 | break; |
747 | case WRITE_SAME_16: | |
748 | sectors = transport_get_sectors_16(cdb); | |
749 | if (!sectors) { | |
750 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 751 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
752 | } |
753 | ||
1fd032ee | 754 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
755 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
756 | ||
cd063bef | 757 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 758 | if (ret) |
cd063bef | 759 | return ret; |
d6e0175c CH |
760 | break; |
761 | case WRITE_SAME: | |
762 | sectors = transport_get_sectors_10(cdb); | |
763 | if (!sectors) { | |
764 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 765 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
766 | } |
767 | ||
1fd032ee | 768 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
769 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
770 | ||
771 | /* | |
772 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
773 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
774 | */ | |
cd063bef | 775 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 776 | if (ret) |
cd063bef | 777 | return ret; |
d6e0175c CH |
778 | break; |
779 | case VERIFY: | |
1fd032ee | 780 | size = 0; |
1920ed61 | 781 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 782 | break; |
1a1ff38c BK |
783 | case REZERO_UNIT: |
784 | case SEEK_6: | |
785 | case SEEK_10: | |
786 | /* | |
787 | * There are still clients out there which use these old SCSI-2 | |
788 | * commands. This mainly happens when running VMs with legacy | |
789 | * guest systems, connected via SCSI command pass-through to | |
790 | * iSCSI targets. Make them happy and return status GOOD. | |
791 | */ | |
792 | size = 0; | |
793 | cmd->execute_cmd = sbc_emulate_noop; | |
794 | break; | |
d6e0175c | 795 | default: |
1fd032ee | 796 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
797 | if (ret) |
798 | return ret; | |
799 | } | |
800 | ||
801 | /* reject any command that we don't have a handler for */ | |
802 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 803 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
804 | |
805 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
806 | unsigned long long end_lba; |
807 | ||
0fd97ccf | 808 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
809 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
810 | " big sectors %u exceeds fabric_max_sectors:" | |
811 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 812 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 813 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 814 | } |
0fd97ccf | 815 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
816 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
817 | " big sectors %u exceeds backend hw_max_sectors:" | |
818 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 819 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 820 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
821 | } |
822 | ||
1fd032ee CH |
823 | end_lba = dev->transport->get_blocks(dev) + 1; |
824 | if (cmd->t_task_lba + sectors > end_lba) { | |
825 | pr_err("cmd exceeds last lba %llu " | |
826 | "(lba %llu, sectors %u)\n", | |
827 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 828 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
829 | } |
830 | ||
68ff9b9b NB |
831 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
832 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
833 | } |
834 | ||
de103c93 | 835 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
836 | } |
837 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 838 | |
6f23ac8a CH |
839 | u32 sbc_get_device_type(struct se_device *dev) |
840 | { | |
841 | return TYPE_DISK; | |
842 | } | |
843 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
844 | |
845 | sense_reason_t | |
846 | sbc_execute_unmap(struct se_cmd *cmd, | |
847 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
848 | sector_t, sector_t), | |
849 | void *priv) | |
850 | { | |
851 | struct se_device *dev = cmd->se_dev; | |
852 | unsigned char *buf, *ptr = NULL; | |
853 | sector_t lba; | |
854 | int size; | |
855 | u32 range; | |
856 | sense_reason_t ret = 0; | |
857 | int dl, bd_dl; | |
858 | ||
859 | /* We never set ANC_SUP */ | |
860 | if (cmd->t_task_cdb[1]) | |
861 | return TCM_INVALID_CDB_FIELD; | |
862 | ||
863 | if (cmd->data_length == 0) { | |
864 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
865 | return 0; | |
866 | } | |
867 | ||
868 | if (cmd->data_length < 8) { | |
869 | pr_warn("UNMAP parameter list length %u too small\n", | |
870 | cmd->data_length); | |
871 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
872 | } | |
873 | ||
874 | buf = transport_kmap_data_sg(cmd); | |
875 | if (!buf) | |
876 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
877 | ||
878 | dl = get_unaligned_be16(&buf[0]); | |
879 | bd_dl = get_unaligned_be16(&buf[2]); | |
880 | ||
881 | size = cmd->data_length - 8; | |
882 | if (bd_dl > size) | |
883 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
884 | cmd->data_length, bd_dl); | |
885 | else | |
886 | size = bd_dl; | |
887 | ||
888 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
889 | ret = TCM_INVALID_PARAMETER_LIST; | |
890 | goto err; | |
891 | } | |
892 | ||
893 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
894 | ptr = &buf[8]; | |
895 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
896 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
897 | ||
898 | while (size >= 16) { | |
899 | lba = get_unaligned_be64(&ptr[0]); | |
900 | range = get_unaligned_be32(&ptr[8]); | |
901 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
902 | (unsigned long long)lba, range); | |
903 | ||
904 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
905 | ret = TCM_INVALID_PARAMETER_LIST; | |
906 | goto err; | |
907 | } | |
908 | ||
909 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
910 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
911 | goto err; | |
912 | } | |
913 | ||
914 | ret = do_unmap_fn(cmd, priv, lba, range); | |
915 | if (ret) | |
916 | goto err; | |
917 | ||
918 | ptr += 16; | |
919 | size -= 16; | |
920 | } | |
921 | ||
922 | err: | |
923 | transport_kunmap_data_sg(cmd); | |
924 | if (!ret) | |
925 | target_complete_cmd(cmd, GOOD); | |
926 | return ret; | |
927 | } | |
928 | EXPORT_SYMBOL(sbc_execute_unmap); |