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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 | ||
d8855c15 NB |
352 | /* |
353 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
354 | * within target_complete_ok_work() if the command was successfully | |
355 | * sent to the backend driver. | |
356 | */ | |
357 | spin_lock_irq(&cmd->t_state_lock); | |
358 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
359 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
360 | spin_unlock_irq(&cmd->t_state_lock); | |
361 | ||
68ff9b9b NB |
362 | /* |
363 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
364 | * before the original READ I/O submission. | |
365 | */ | |
366 | up(&dev->caw_sem); | |
367 | ||
368 | return TCM_NO_SENSE; | |
369 | } | |
370 | ||
371 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
372 | { | |
373 | struct se_device *dev = cmd->se_dev; | |
374 | struct scatterlist *write_sg = NULL, *sg; | |
375 | unsigned char *buf, *addr; | |
376 | struct sg_mapping_iter m; | |
377 | unsigned int offset = 0, len; | |
378 | unsigned int nlbas = cmd->t_task_nolb; | |
379 | unsigned int block_size = dev->dev_attrib.block_size; | |
380 | unsigned int compare_len = (nlbas * block_size); | |
381 | sense_reason_t ret = TCM_NO_SENSE; | |
382 | int rc, i; | |
383 | ||
cf6d1f09 NB |
384 | /* |
385 | * Handle early failure in transport_generic_request_failure(), | |
386 | * which will not have taken ->caw_mutex yet.. | |
387 | */ | |
388 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
389 | return TCM_NO_SENSE; | |
390 | ||
68ff9b9b NB |
391 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
392 | if (!buf) { | |
393 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
394 | ret = TCM_OUT_OF_RESOURCES; |
395 | goto out; | |
68ff9b9b NB |
396 | } |
397 | ||
398 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, | |
399 | GFP_KERNEL); | |
400 | if (!write_sg) { | |
401 | pr_err("Unable to allocate compare_and_write sg\n"); | |
402 | ret = TCM_OUT_OF_RESOURCES; | |
403 | goto out; | |
404 | } | |
405 | /* | |
406 | * Setup verify and write data payloads from total NumberLBAs. | |
407 | */ | |
408 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
409 | cmd->data_length); | |
410 | if (!rc) { | |
411 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
412 | ret = TCM_OUT_OF_RESOURCES; | |
413 | goto out; | |
414 | } | |
415 | /* | |
416 | * Compare against SCSI READ payload against verify payload | |
417 | */ | |
418 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
419 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
420 | if (!addr) { | |
421 | ret = TCM_OUT_OF_RESOURCES; | |
422 | goto out; | |
423 | } | |
424 | ||
425 | len = min(sg->length, compare_len); | |
426 | ||
427 | if (memcmp(addr, buf + offset, len)) { | |
428 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
429 | addr, buf + offset); | |
430 | kunmap_atomic(addr); | |
431 | goto miscompare; | |
432 | } | |
433 | kunmap_atomic(addr); | |
434 | ||
435 | offset += len; | |
436 | compare_len -= len; | |
437 | if (!compare_len) | |
438 | break; | |
439 | } | |
440 | ||
441 | i = 0; | |
442 | len = cmd->t_task_nolb * block_size; | |
443 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
444 | /* | |
445 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
446 | */ | |
447 | while (len) { | |
448 | sg_miter_next(&m); | |
449 | ||
450 | if (block_size < PAGE_SIZE) { | |
451 | sg_set_page(&write_sg[i], m.page, block_size, | |
452 | block_size); | |
453 | } else { | |
454 | sg_miter_next(&m); | |
455 | sg_set_page(&write_sg[i], m.page, block_size, | |
456 | 0); | |
457 | } | |
458 | len -= block_size; | |
459 | i++; | |
460 | } | |
461 | sg_miter_stop(&m); | |
462 | /* | |
463 | * Save the original SGL + nents values before updating to new | |
464 | * assignments, to be released in transport_free_pages() -> | |
465 | * transport_reset_sgl_orig() | |
466 | */ | |
467 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
468 | cmd->t_data_sg = write_sg; | |
469 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
470 | cmd->t_data_nents = 1; | |
471 | ||
472 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
473 | cmd->transport_complete_callback = compare_and_write_post; | |
474 | /* | |
475 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
476 | * for submitting the adjusted SGL to write instance user-data. | |
477 | */ | |
478 | cmd->execute_cmd = sbc_execute_rw; | |
479 | ||
480 | spin_lock_irq(&cmd->t_state_lock); | |
481 | cmd->t_state = TRANSPORT_PROCESSING; | |
482 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
483 | spin_unlock_irq(&cmd->t_state_lock); | |
484 | ||
485 | __target_execute_cmd(cmd); | |
486 | ||
487 | kfree(buf); | |
488 | return ret; | |
489 | ||
490 | miscompare: | |
491 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
492 | dev->transport->name); | |
493 | ret = TCM_MISCOMPARE_VERIFY; | |
494 | out: | |
495 | /* | |
496 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
497 | * sbc_compare_and_write() before the original READ I/O submission. | |
498 | */ | |
499 | up(&dev->caw_sem); | |
500 | kfree(write_sg); | |
501 | kfree(buf); | |
502 | return ret; | |
503 | } | |
504 | ||
505 | static sense_reason_t | |
506 | sbc_compare_and_write(struct se_cmd *cmd) | |
507 | { | |
508 | struct se_device *dev = cmd->se_dev; | |
509 | sense_reason_t ret; | |
510 | int rc; | |
511 | /* | |
512 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
513 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
514 | */ | |
515 | rc = down_interruptible(&dev->caw_sem); | |
516 | if ((rc != 0) || signal_pending(current)) { | |
517 | cmd->transport_complete_callback = NULL; | |
518 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
519 | } | |
b7191253 NB |
520 | /* |
521 | * Reset cmd->data_length to individual block_size in order to not | |
522 | * confuse backend drivers that depend on this value matching the | |
523 | * size of the I/O being submitted. | |
524 | */ | |
525 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
526 | |
527 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
528 | DMA_FROM_DEVICE); | |
529 | if (ret) { | |
530 | cmd->transport_complete_callback = NULL; | |
531 | up(&dev->caw_sem); | |
532 | return ret; | |
533 | } | |
534 | /* | |
535 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
536 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
537 | * of WRITE instance user-data. | |
538 | */ | |
539 | return TCM_NO_SENSE; | |
540 | } | |
541 | ||
de103c93 CH |
542 | sense_reason_t |
543 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 544 | { |
d6e0175c CH |
545 | struct se_device *dev = cmd->se_dev; |
546 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 547 | unsigned int size; |
d6e0175c | 548 | u32 sectors = 0; |
de103c93 | 549 | sense_reason_t ret; |
d6e0175c CH |
550 | |
551 | switch (cdb[0]) { | |
552 | case READ_6: | |
553 | sectors = transport_get_sectors_6(cdb); | |
554 | cmd->t_task_lba = transport_lba_21(cdb); | |
555 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
556 | cmd->execute_rw = ops->execute_rw; |
557 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
558 | break; |
559 | case READ_10: | |
560 | sectors = transport_get_sectors_10(cdb); | |
561 | cmd->t_task_lba = transport_lba_32(cdb); | |
562 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
563 | cmd->execute_rw = ops->execute_rw; |
564 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
565 | break; |
566 | case READ_12: | |
567 | sectors = transport_get_sectors_12(cdb); | |
568 | cmd->t_task_lba = transport_lba_32(cdb); | |
569 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
570 | cmd->execute_rw = ops->execute_rw; |
571 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
572 | break; |
573 | case READ_16: | |
574 | sectors = transport_get_sectors_16(cdb); | |
575 | cmd->t_task_lba = transport_lba_64(cdb); | |
576 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
577 | cmd->execute_rw = ops->execute_rw; |
578 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
579 | break; |
580 | case WRITE_6: | |
581 | sectors = transport_get_sectors_6(cdb); | |
582 | cmd->t_task_lba = transport_lba_21(cdb); | |
583 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
584 | cmd->execute_rw = ops->execute_rw; |
585 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
586 | break; |
587 | case WRITE_10: | |
588 | case WRITE_VERIFY: | |
589 | sectors = transport_get_sectors_10(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_12: | |
598 | sectors = transport_get_sectors_12(cdb); | |
599 | cmd->t_task_lba = transport_lba_32(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 WRITE_16: | |
607 | sectors = transport_get_sectors_16(cdb); | |
608 | cmd->t_task_lba = transport_lba_64(cdb); | |
609 | if (cdb[1] & 0x8) | |
610 | cmd->se_cmd_flags |= SCF_FUA; | |
611 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
612 | cmd->execute_rw = ops->execute_rw; |
613 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
614 | break; |
615 | case XDWRITEREAD_10: | |
de103c93 | 616 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 617 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 618 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
619 | sectors = transport_get_sectors_10(cdb); |
620 | ||
621 | cmd->t_task_lba = transport_lba_32(cdb); | |
622 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
623 | ||
624 | /* | |
625 | * Setup BIDI XOR callback to be run after I/O completion. | |
626 | */ | |
a82a9538 NB |
627 | cmd->execute_rw = ops->execute_rw; |
628 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
629 | cmd->transport_complete_callback = &xdreadwrite_callback; |
630 | if (cdb[1] & 0x8) | |
631 | cmd->se_cmd_flags |= SCF_FUA; | |
632 | break; | |
633 | case VARIABLE_LENGTH_CMD: | |
634 | { | |
635 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
636 | switch (service_action) { | |
637 | case XDWRITEREAD_32: | |
638 | sectors = transport_get_sectors_32(cdb); | |
639 | ||
640 | /* | |
641 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
642 | * XDWRITE_READ_32 logic. | |
643 | */ | |
644 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
645 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
646 | ||
647 | /* | |
648 | * Setup BIDI XOR callback to be run during after I/O | |
649 | * completion. | |
650 | */ | |
a82a9538 NB |
651 | cmd->execute_rw = ops->execute_rw; |
652 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
653 | cmd->transport_complete_callback = &xdreadwrite_callback; |
654 | if (cdb[1] & 0x8) | |
655 | cmd->se_cmd_flags |= SCF_FUA; | |
656 | break; | |
657 | case WRITE_SAME_32: | |
658 | sectors = transport_get_sectors_32(cdb); | |
659 | if (!sectors) { | |
660 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
661 | " supported\n"); | |
de103c93 | 662 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
663 | } |
664 | ||
1fd032ee | 665 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
666 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
667 | ||
cd063bef | 668 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 669 | if (ret) |
cd063bef | 670 | return ret; |
d6e0175c CH |
671 | break; |
672 | default: | |
673 | pr_err("VARIABLE_LENGTH_CMD service action" | |
674 | " 0x%04x not supported\n", service_action); | |
de103c93 | 675 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
676 | } |
677 | break; | |
678 | } | |
68ff9b9b NB |
679 | case COMPARE_AND_WRITE: |
680 | sectors = cdb[13]; | |
681 | /* | |
682 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
683 | */ | |
684 | if (sectors > 1) { | |
685 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
686 | " than 1\n", sectors); | |
687 | return TCM_INVALID_CDB_FIELD; | |
688 | } | |
689 | /* | |
690 | * Double size because we have two buffers, note that | |
691 | * zero is not an error.. | |
692 | */ | |
693 | size = 2 * sbc_get_size(cmd, sectors); | |
694 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
695 | cmd->t_task_nolb = sectors; | |
696 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
697 | cmd->execute_rw = ops->execute_rw; | |
698 | cmd->execute_cmd = sbc_compare_and_write; | |
699 | cmd->transport_complete_callback = compare_and_write_callback; | |
700 | break; | |
d6e0175c | 701 | case READ_CAPACITY: |
1fd032ee CH |
702 | size = READ_CAP_LEN; |
703 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
704 | break; |
705 | case SERVICE_ACTION_IN: | |
706 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
707 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 708 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c CH |
709 | break; |
710 | default: | |
711 | pr_err("Unsupported SA: 0x%02x\n", | |
712 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 713 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 714 | } |
1fd032ee | 715 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
716 | (cdb[12] << 8) | cdb[13]; |
717 | break; | |
718 | case SYNCHRONIZE_CACHE: | |
719 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
720 | if (!ops->execute_sync_cache) { |
721 | size = 0; | |
722 | cmd->execute_cmd = sbc_emulate_noop; | |
723 | break; | |
724 | } | |
ad67f0d9 | 725 | |
d6e0175c CH |
726 | /* |
727 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
728 | */ | |
729 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
730 | sectors = transport_get_sectors_10(cdb); | |
731 | cmd->t_task_lba = transport_lba_32(cdb); | |
732 | } else { | |
733 | sectors = transport_get_sectors_16(cdb); | |
734 | cmd->t_task_lba = transport_lba_64(cdb); | |
735 | } | |
736 | ||
1fd032ee | 737 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
738 | |
739 | /* | |
740 | * Check to ensure that LBA + Range does not exceed past end of | |
741 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
742 | */ | |
743 | if (cmd->t_task_lba || sectors) { | |
744 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 745 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 746 | } |
ad67f0d9 | 747 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
748 | break; |
749 | case UNMAP: | |
14150a6b | 750 | if (!ops->execute_unmap) |
de103c93 | 751 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 752 | |
1fd032ee | 753 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 754 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
755 | break; |
756 | case WRITE_SAME_16: | |
757 | sectors = transport_get_sectors_16(cdb); | |
758 | if (!sectors) { | |
759 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 760 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
761 | } |
762 | ||
1fd032ee | 763 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
764 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
765 | ||
cd063bef | 766 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 767 | if (ret) |
cd063bef | 768 | return ret; |
d6e0175c CH |
769 | break; |
770 | case WRITE_SAME: | |
771 | sectors = transport_get_sectors_10(cdb); | |
772 | if (!sectors) { | |
773 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 774 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
775 | } |
776 | ||
1fd032ee | 777 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
778 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
779 | ||
780 | /* | |
781 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
782 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
783 | */ | |
cd063bef | 784 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 785 | if (ret) |
cd063bef | 786 | return ret; |
d6e0175c CH |
787 | break; |
788 | case VERIFY: | |
1fd032ee | 789 | size = 0; |
1920ed61 | 790 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 791 | break; |
1a1ff38c BK |
792 | case REZERO_UNIT: |
793 | case SEEK_6: | |
794 | case SEEK_10: | |
795 | /* | |
796 | * There are still clients out there which use these old SCSI-2 | |
797 | * commands. This mainly happens when running VMs with legacy | |
798 | * guest systems, connected via SCSI command pass-through to | |
799 | * iSCSI targets. Make them happy and return status GOOD. | |
800 | */ | |
801 | size = 0; | |
802 | cmd->execute_cmd = sbc_emulate_noop; | |
803 | break; | |
d6e0175c | 804 | default: |
1fd032ee | 805 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
806 | if (ret) |
807 | return ret; | |
808 | } | |
809 | ||
810 | /* reject any command that we don't have a handler for */ | |
811 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 812 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
813 | |
814 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
815 | unsigned long long end_lba; |
816 | ||
0fd97ccf | 817 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
818 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
819 | " big sectors %u exceeds fabric_max_sectors:" | |
820 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 821 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 822 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 823 | } |
0fd97ccf | 824 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
825 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
826 | " big sectors %u exceeds backend hw_max_sectors:" | |
827 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 828 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 829 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
830 | } |
831 | ||
1fd032ee CH |
832 | end_lba = dev->transport->get_blocks(dev) + 1; |
833 | if (cmd->t_task_lba + sectors > end_lba) { | |
834 | pr_err("cmd exceeds last lba %llu " | |
835 | "(lba %llu, sectors %u)\n", | |
836 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 837 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
838 | } |
839 | ||
68ff9b9b NB |
840 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
841 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
842 | } |
843 | ||
de103c93 | 844 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
845 | } |
846 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 847 | |
6f23ac8a CH |
848 | u32 sbc_get_device_type(struct se_device *dev) |
849 | { | |
850 | return TYPE_DISK; | |
851 | } | |
852 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
853 | |
854 | sense_reason_t | |
855 | sbc_execute_unmap(struct se_cmd *cmd, | |
856 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
857 | sector_t, sector_t), | |
858 | void *priv) | |
859 | { | |
860 | struct se_device *dev = cmd->se_dev; | |
861 | unsigned char *buf, *ptr = NULL; | |
862 | sector_t lba; | |
863 | int size; | |
864 | u32 range; | |
865 | sense_reason_t ret = 0; | |
866 | int dl, bd_dl; | |
867 | ||
868 | /* We never set ANC_SUP */ | |
869 | if (cmd->t_task_cdb[1]) | |
870 | return TCM_INVALID_CDB_FIELD; | |
871 | ||
872 | if (cmd->data_length == 0) { | |
873 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
874 | return 0; | |
875 | } | |
876 | ||
877 | if (cmd->data_length < 8) { | |
878 | pr_warn("UNMAP parameter list length %u too small\n", | |
879 | cmd->data_length); | |
880 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
881 | } | |
882 | ||
883 | buf = transport_kmap_data_sg(cmd); | |
884 | if (!buf) | |
885 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
886 | ||
887 | dl = get_unaligned_be16(&buf[0]); | |
888 | bd_dl = get_unaligned_be16(&buf[2]); | |
889 | ||
890 | size = cmd->data_length - 8; | |
891 | if (bd_dl > size) | |
892 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
893 | cmd->data_length, bd_dl); | |
894 | else | |
895 | size = bd_dl; | |
896 | ||
897 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
898 | ret = TCM_INVALID_PARAMETER_LIST; | |
899 | goto err; | |
900 | } | |
901 | ||
902 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
903 | ptr = &buf[8]; | |
904 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
905 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
906 | ||
907 | while (size >= 16) { | |
908 | lba = get_unaligned_be64(&ptr[0]); | |
909 | range = get_unaligned_be32(&ptr[8]); | |
910 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
911 | (unsigned long long)lba, range); | |
912 | ||
913 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
914 | ret = TCM_INVALID_PARAMETER_LIST; | |
915 | goto err; | |
916 | } | |
917 | ||
918 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
919 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
920 | goto err; | |
921 | } | |
922 | ||
923 | ret = do_unmap_fn(cmd, priv, lba, range); | |
924 | if (ret) | |
925 | goto err; | |
926 | ||
927 | ptr += 16; | |
928 | size -= 16; | |
929 | } | |
930 | ||
931 | err: | |
932 | transport_kunmap_data_sg(cmd); | |
933 | if (!ret) | |
934 | target_complete_cmd(cmd, GOOD); | |
935 | return ret; | |
936 | } | |
937 | EXPORT_SYMBOL(sbc_execute_unmap); |