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Linux 3.12.39
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob63d56cda2b9684b5eef7527667140bfb296bc586
1 /*
2 * SCSI Block Commands (SBC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
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>
28 #include <scsi/scsi_tcq.h>
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
38 static sense_reason_t
39 sbc_emulate_readcapacity(struct se_cmd *cmd)
40 {
41 struct se_device *dev = cmd->se_dev;
42 unsigned char *cdb = cmd->t_task_cdb;
43 unsigned long long blocks_long = dev->transport->get_blocks(dev);
44 unsigned char *rbuf;
45 unsigned char buf[8];
46 u32 blocks;
47
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
63 if (blocks_long >= 0x00000000ffffffff)
64 blocks = 0xffffffff;
65 else
66 blocks = (u32)blocks_long;
67
68 buf[0] = (blocks >> 24) & 0xff;
69 buf[1] = (blocks >> 16) & 0xff;
70 buf[2] = (blocks >> 8) & 0xff;
71 buf[3] = blocks & 0xff;
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;
76
77 rbuf = transport_kmap_data_sg(cmd);
78 if (rbuf) {
79 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
80 transport_kunmap_data_sg(cmd);
81 }
82
83 target_complete_cmd_with_length(cmd, GOOD, 8);
84 return 0;
85 }
86
87 static sense_reason_t
88 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
89 {
90 struct se_device *dev = cmd->se_dev;
91 unsigned char *rbuf;
92 unsigned char buf[32];
93 unsigned long long blocks = dev->transport->get_blocks(dev);
94
95 memset(buf, 0, sizeof(buf));
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;
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;
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 */
112 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
113 buf[14] = 0x80;
114
115 rbuf = transport_kmap_data_sg(cmd);
116 if (rbuf) {
117 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
118 transport_kunmap_data_sg(cmd);
119 }
120
121 target_complete_cmd_with_length(cmd, GOOD, 32);
122 return 0;
123 }
124
125 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
126 {
127 u32 num_blocks;
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 */
140 if (num_blocks)
141 return num_blocks;
142
143 return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
144 cmd->t_task_lba + 1;
145 }
146 EXPORT_SYMBOL(sbc_get_write_same_sectors);
147
148 static sense_reason_t
149 sbc_emulate_noop(struct se_cmd *cmd)
150 {
151 target_complete_cmd(cmd, GOOD);
152 return 0;
153 }
154
155 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
156 {
157 return cmd->se_dev->dev_attrib.block_size * sectors;
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
166 sectors = cmd->data_length / dev->dev_attrib.block_size;
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
250 static sense_reason_t
251 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
252 {
253 struct se_device *dev = cmd->se_dev;
254 sector_t end_lba = dev->transport->get_blocks(dev) + 1;
255 unsigned int sectors = sbc_get_write_same_sectors(cmd);
256
257 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
258 pr_err("WRITE_SAME PBDATA and LBDATA"
259 " bits not supported for Block Discard"
260 " Emulation\n");
261 return TCM_UNSUPPORTED_SCSI_OPCODE;
262 }
263 if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
264 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
265 sectors, cmd->se_dev->dev_attrib.max_write_same_len);
266 return TCM_INVALID_CDB_FIELD;
267 }
268 /*
269 * Sanity check for LBA wrap and request past end of device.
270 */
271 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
272 ((cmd->t_task_lba + sectors) > end_lba)) {
273 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
274 (unsigned long long)end_lba, cmd->t_task_lba, sectors);
275 return TCM_ADDRESS_OUT_OF_RANGE;
276 }
277
278 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
279 if (flags[0] & 0x10) {
280 pr_warn("WRITE SAME with ANCHOR not supported\n");
281 return TCM_INVALID_CDB_FIELD;
282 }
283 /*
284 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
285 * translated into block discard requests within backend code.
286 */
287 if (flags[0] & 0x08) {
288 if (!ops->execute_write_same_unmap)
289 return TCM_UNSUPPORTED_SCSI_OPCODE;
290
291 cmd->execute_cmd = ops->execute_write_same_unmap;
292 return 0;
293 }
294 if (!ops->execute_write_same)
295 return TCM_UNSUPPORTED_SCSI_OPCODE;
296
297 cmd->execute_cmd = ops->execute_write_same;
298 return 0;
299 }
300
301 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
302 {
303 unsigned char *buf, *addr;
304 struct scatterlist *sg;
305 unsigned int offset;
306 sense_reason_t ret = TCM_NO_SENSE;
307 int i, count;
308 /*
309 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
310 *
311 * 1) read the specified logical block(s);
312 * 2) transfer logical blocks from the data-out buffer;
313 * 3) XOR the logical blocks transferred from the data-out buffer with
314 * the logical blocks read, storing the resulting XOR data in a buffer;
315 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
316 * blocks transferred from the data-out buffer; and
317 * 5) transfer the resulting XOR data to the data-in buffer.
318 */
319 buf = kmalloc(cmd->data_length, GFP_KERNEL);
320 if (!buf) {
321 pr_err("Unable to allocate xor_callback buf\n");
322 return TCM_OUT_OF_RESOURCES;
323 }
324 /*
325 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
326 * into the locally allocated *buf
327 */
328 sg_copy_to_buffer(cmd->t_data_sg,
329 cmd->t_data_nents,
330 buf,
331 cmd->data_length);
332
333 /*
334 * Now perform the XOR against the BIDI read memory located at
335 * cmd->t_mem_bidi_list
336 */
337
338 offset = 0;
339 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
340 addr = kmap_atomic(sg_page(sg));
341 if (!addr) {
342 ret = TCM_OUT_OF_RESOURCES;
343 goto out;
344 }
345
346 for (i = 0; i < sg->length; i++)
347 *(addr + sg->offset + i) ^= *(buf + offset + i);
348
349 offset += sg->length;
350 kunmap_atomic(addr);
351 }
352
353 out:
354 kfree(buf);
355 return ret;
356 }
357
358 static sense_reason_t
359 sbc_execute_rw(struct se_cmd *cmd)
360 {
361 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
362 cmd->data_direction);
363 }
364
365 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
366 {
367 struct se_device *dev = cmd->se_dev;
368
369 /*
370 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
371 * within target_complete_ok_work() if the command was successfully
372 * sent to the backend driver.
373 */
374 spin_lock_irq(&cmd->t_state_lock);
375 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
376 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
377 spin_unlock_irq(&cmd->t_state_lock);
378
379 /*
380 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
381 * before the original READ I/O submission.
382 */
383 up(&dev->caw_sem);
384
385 return TCM_NO_SENSE;
386 }
387
388 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
389 {
390 struct se_device *dev = cmd->se_dev;
391 struct scatterlist *write_sg = NULL, *sg;
392 unsigned char *buf = NULL, *addr;
393 struct sg_mapping_iter m;
394 unsigned int offset = 0, len;
395 unsigned int nlbas = cmd->t_task_nolb;
396 unsigned int block_size = dev->dev_attrib.block_size;
397 unsigned int compare_len = (nlbas * block_size);
398 sense_reason_t ret = TCM_NO_SENSE;
399 int rc, i;
400
401 /*
402 * Handle early failure in transport_generic_request_failure(),
403 * which will not have taken ->caw_mutex yet..
404 */
405 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
406 return TCM_NO_SENSE;
407 /*
408 * Immediately exit + release dev->caw_sem if command has already
409 * been failed with a non-zero SCSI status.
410 */
411 if (cmd->scsi_status) {
412 pr_err("compare_and_write_callback: non zero scsi_status:"
413 " 0x%02x\n", cmd->scsi_status);
414 goto out;
415 }
416
417 buf = kzalloc(cmd->data_length, GFP_KERNEL);
418 if (!buf) {
419 pr_err("Unable to allocate compare_and_write buf\n");
420 ret = TCM_OUT_OF_RESOURCES;
421 goto out;
422 }
423
424 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
425 GFP_KERNEL);
426 if (!write_sg) {
427 pr_err("Unable to allocate compare_and_write sg\n");
428 ret = TCM_OUT_OF_RESOURCES;
429 goto out;
430 }
431 sg_init_table(write_sg, cmd->t_data_nents);
432 /*
433 * Setup verify and write data payloads from total NumberLBAs.
434 */
435 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
436 cmd->data_length);
437 if (!rc) {
438 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
439 ret = TCM_OUT_OF_RESOURCES;
440 goto out;
441 }
442 /*
443 * Compare against SCSI READ payload against verify payload
444 */
445 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
446 addr = (unsigned char *)kmap_atomic(sg_page(sg));
447 if (!addr) {
448 ret = TCM_OUT_OF_RESOURCES;
449 goto out;
450 }
451
452 len = min(sg->length, compare_len);
453
454 if (memcmp(addr, buf + offset, len)) {
455 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
456 addr, buf + offset);
457 kunmap_atomic(addr);
458 goto miscompare;
459 }
460 kunmap_atomic(addr);
461
462 offset += len;
463 compare_len -= len;
464 if (!compare_len)
465 break;
466 }
467
468 i = 0;
469 len = cmd->t_task_nolb * block_size;
470 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
471 /*
472 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
473 */
474 while (len) {
475 sg_miter_next(&m);
476
477 if (block_size < PAGE_SIZE) {
478 sg_set_page(&write_sg[i], m.page, block_size,
479 block_size);
480 } else {
481 sg_miter_next(&m);
482 sg_set_page(&write_sg[i], m.page, block_size,
483 0);
484 }
485 len -= block_size;
486 i++;
487 }
488 sg_miter_stop(&m);
489 /*
490 * Save the original SGL + nents values before updating to new
491 * assignments, to be released in transport_free_pages() ->
492 * transport_reset_sgl_orig()
493 */
494 cmd->t_data_sg_orig = cmd->t_data_sg;
495 cmd->t_data_sg = write_sg;
496 cmd->t_data_nents_orig = cmd->t_data_nents;
497 cmd->t_data_nents = 1;
498
499 cmd->sam_task_attr = MSG_HEAD_TAG;
500 cmd->transport_complete_callback = compare_and_write_post;
501 /*
502 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
503 * for submitting the adjusted SGL to write instance user-data.
504 */
505 cmd->execute_cmd = sbc_execute_rw;
506
507 spin_lock_irq(&cmd->t_state_lock);
508 cmd->t_state = TRANSPORT_PROCESSING;
509 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
510 spin_unlock_irq(&cmd->t_state_lock);
511
512 __target_execute_cmd(cmd);
513
514 kfree(buf);
515 return ret;
516
517 miscompare:
518 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
519 dev->transport->name);
520 ret = TCM_MISCOMPARE_VERIFY;
521 out:
522 /*
523 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
524 * sbc_compare_and_write() before the original READ I/O submission.
525 */
526 up(&dev->caw_sem);
527 kfree(write_sg);
528 kfree(buf);
529 return ret;
530 }
531
532 static sense_reason_t
533 sbc_compare_and_write(struct se_cmd *cmd)
534 {
535 struct se_device *dev = cmd->se_dev;
536 sense_reason_t ret;
537 int rc;
538 /*
539 * Submit the READ first for COMPARE_AND_WRITE to perform the
540 * comparision using SGLs at cmd->t_bidi_data_sg..
541 */
542 rc = down_interruptible(&dev->caw_sem);
543 if ((rc != 0) || signal_pending(current)) {
544 cmd->transport_complete_callback = NULL;
545 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
546 }
547 /*
548 * Reset cmd->data_length to individual block_size in order to not
549 * confuse backend drivers that depend on this value matching the
550 * size of the I/O being submitted.
551 */
552 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
553
554 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
555 DMA_FROM_DEVICE);
556 if (ret) {
557 cmd->transport_complete_callback = NULL;
558 up(&dev->caw_sem);
559 return ret;
560 }
561 /*
562 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
563 * upon MISCOMPARE, or in compare_and_write_done() upon completion
564 * of WRITE instance user-data.
565 */
566 return TCM_NO_SENSE;
567 }
568
569 sense_reason_t
570 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
571 {
572 struct se_device *dev = cmd->se_dev;
573 unsigned char *cdb = cmd->t_task_cdb;
574 unsigned int size;
575 u32 sectors = 0;
576 sense_reason_t ret;
577
578 switch (cdb[0]) {
579 case READ_6:
580 sectors = transport_get_sectors_6(cdb);
581 cmd->t_task_lba = transport_lba_21(cdb);
582 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
583 cmd->execute_rw = ops->execute_rw;
584 cmd->execute_cmd = sbc_execute_rw;
585 break;
586 case READ_10:
587 sectors = transport_get_sectors_10(cdb);
588 cmd->t_task_lba = transport_lba_32(cdb);
589 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
590 cmd->execute_rw = ops->execute_rw;
591 cmd->execute_cmd = sbc_execute_rw;
592 break;
593 case READ_12:
594 sectors = transport_get_sectors_12(cdb);
595 cmd->t_task_lba = transport_lba_32(cdb);
596 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
597 cmd->execute_rw = ops->execute_rw;
598 cmd->execute_cmd = sbc_execute_rw;
599 break;
600 case READ_16:
601 sectors = transport_get_sectors_16(cdb);
602 cmd->t_task_lba = transport_lba_64(cdb);
603 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
604 cmd->execute_rw = ops->execute_rw;
605 cmd->execute_cmd = sbc_execute_rw;
606 break;
607 case WRITE_6:
608 sectors = transport_get_sectors_6(cdb);
609 cmd->t_task_lba = transport_lba_21(cdb);
610 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
611 cmd->execute_rw = ops->execute_rw;
612 cmd->execute_cmd = sbc_execute_rw;
613 break;
614 case WRITE_10:
615 case WRITE_VERIFY:
616 sectors = transport_get_sectors_10(cdb);
617 cmd->t_task_lba = transport_lba_32(cdb);
618 if (cdb[1] & 0x8)
619 cmd->se_cmd_flags |= SCF_FUA;
620 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
621 cmd->execute_rw = ops->execute_rw;
622 cmd->execute_cmd = sbc_execute_rw;
623 break;
624 case WRITE_12:
625 sectors = transport_get_sectors_12(cdb);
626 cmd->t_task_lba = transport_lba_32(cdb);
627 if (cdb[1] & 0x8)
628 cmd->se_cmd_flags |= SCF_FUA;
629 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
630 cmd->execute_rw = ops->execute_rw;
631 cmd->execute_cmd = sbc_execute_rw;
632 break;
633 case WRITE_16:
634 sectors = transport_get_sectors_16(cdb);
635 cmd->t_task_lba = transport_lba_64(cdb);
636 if (cdb[1] & 0x8)
637 cmd->se_cmd_flags |= SCF_FUA;
638 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
639 cmd->execute_rw = ops->execute_rw;
640 cmd->execute_cmd = sbc_execute_rw;
641 break;
642 case XDWRITEREAD_10:
643 if (cmd->data_direction != DMA_TO_DEVICE ||
644 !(cmd->se_cmd_flags & SCF_BIDI))
645 return TCM_INVALID_CDB_FIELD;
646 sectors = transport_get_sectors_10(cdb);
647
648 cmd->t_task_lba = transport_lba_32(cdb);
649 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
650
651 /*
652 * Setup BIDI XOR callback to be run after I/O completion.
653 */
654 cmd->execute_rw = ops->execute_rw;
655 cmd->execute_cmd = sbc_execute_rw;
656 cmd->transport_complete_callback = &xdreadwrite_callback;
657 if (cdb[1] & 0x8)
658 cmd->se_cmd_flags |= SCF_FUA;
659 break;
660 case VARIABLE_LENGTH_CMD:
661 {
662 u16 service_action = get_unaligned_be16(&cdb[8]);
663 switch (service_action) {
664 case XDWRITEREAD_32:
665 sectors = transport_get_sectors_32(cdb);
666
667 /*
668 * Use WRITE_32 and READ_32 opcodes for the emulated
669 * XDWRITE_READ_32 logic.
670 */
671 cmd->t_task_lba = transport_lba_64_ext(cdb);
672 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
673
674 /*
675 * Setup BIDI XOR callback to be run during after I/O
676 * completion.
677 */
678 cmd->execute_rw = ops->execute_rw;
679 cmd->execute_cmd = sbc_execute_rw;
680 cmd->transport_complete_callback = &xdreadwrite_callback;
681 if (cdb[1] & 0x8)
682 cmd->se_cmd_flags |= SCF_FUA;
683 break;
684 case WRITE_SAME_32:
685 sectors = transport_get_sectors_32(cdb);
686 if (!sectors) {
687 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
688 " supported\n");
689 return TCM_INVALID_CDB_FIELD;
690 }
691
692 size = sbc_get_size(cmd, 1);
693 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
694
695 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
696 if (ret)
697 return ret;
698 break;
699 default:
700 pr_err("VARIABLE_LENGTH_CMD service action"
701 " 0x%04x not supported\n", service_action);
702 return TCM_UNSUPPORTED_SCSI_OPCODE;
703 }
704 break;
705 }
706 case COMPARE_AND_WRITE:
707 sectors = cdb[13];
708 /*
709 * Currently enforce COMPARE_AND_WRITE for a single sector
710 */
711 if (sectors > 1) {
712 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
713 " than 1\n", sectors);
714 return TCM_INVALID_CDB_FIELD;
715 }
716 /*
717 * Double size because we have two buffers, note that
718 * zero is not an error..
719 */
720 size = 2 * sbc_get_size(cmd, sectors);
721 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
722 cmd->t_task_nolb = sectors;
723 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
724 cmd->execute_rw = ops->execute_rw;
725 cmd->execute_cmd = sbc_compare_and_write;
726 cmd->transport_complete_callback = compare_and_write_callback;
727 break;
728 case READ_CAPACITY:
729 size = READ_CAP_LEN;
730 cmd->execute_cmd = sbc_emulate_readcapacity;
731 break;
732 case SERVICE_ACTION_IN:
733 switch (cmd->t_task_cdb[1] & 0x1f) {
734 case SAI_READ_CAPACITY_16:
735 cmd->execute_cmd = sbc_emulate_readcapacity_16;
736 break;
737 default:
738 pr_err("Unsupported SA: 0x%02x\n",
739 cmd->t_task_cdb[1] & 0x1f);
740 return TCM_INVALID_CDB_FIELD;
741 }
742 size = (cdb[10] << 24) | (cdb[11] << 16) |
743 (cdb[12] << 8) | cdb[13];
744 break;
745 case SYNCHRONIZE_CACHE:
746 case SYNCHRONIZE_CACHE_16:
747 if (!ops->execute_sync_cache) {
748 size = 0;
749 cmd->execute_cmd = sbc_emulate_noop;
750 break;
751 }
752
753 /*
754 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
755 */
756 if (cdb[0] == SYNCHRONIZE_CACHE) {
757 sectors = transport_get_sectors_10(cdb);
758 cmd->t_task_lba = transport_lba_32(cdb);
759 } else {
760 sectors = transport_get_sectors_16(cdb);
761 cmd->t_task_lba = transport_lba_64(cdb);
762 }
763
764 size = sbc_get_size(cmd, sectors);
765
766 /*
767 * Check to ensure that LBA + Range does not exceed past end of
768 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
769 */
770 if (cmd->t_task_lba || sectors) {
771 if (sbc_check_valid_sectors(cmd) < 0)
772 return TCM_ADDRESS_OUT_OF_RANGE;
773 }
774 cmd->execute_cmd = ops->execute_sync_cache;
775 break;
776 case UNMAP:
777 if (!ops->execute_unmap)
778 return TCM_UNSUPPORTED_SCSI_OPCODE;
779
780 size = get_unaligned_be16(&cdb[7]);
781 cmd->execute_cmd = ops->execute_unmap;
782 break;
783 case WRITE_SAME_16:
784 sectors = transport_get_sectors_16(cdb);
785 if (!sectors) {
786 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
787 return TCM_INVALID_CDB_FIELD;
788 }
789
790 size = sbc_get_size(cmd, 1);
791 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
792
793 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
794 if (ret)
795 return ret;
796 break;
797 case WRITE_SAME:
798 sectors = transport_get_sectors_10(cdb);
799 if (!sectors) {
800 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
801 return TCM_INVALID_CDB_FIELD;
802 }
803
804 size = sbc_get_size(cmd, 1);
805 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
806
807 /*
808 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
809 * of byte 1 bit 3 UNMAP instead of original reserved field
810 */
811 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
812 if (ret)
813 return ret;
814 break;
815 case VERIFY:
816 size = 0;
817 cmd->execute_cmd = sbc_emulate_noop;
818 break;
819 case REZERO_UNIT:
820 case SEEK_6:
821 case SEEK_10:
822 /*
823 * There are still clients out there which use these old SCSI-2
824 * commands. This mainly happens when running VMs with legacy
825 * guest systems, connected via SCSI command pass-through to
826 * iSCSI targets. Make them happy and return status GOOD.
827 */
828 size = 0;
829 cmd->execute_cmd = sbc_emulate_noop;
830 break;
831 default:
832 ret = spc_parse_cdb(cmd, &size);
833 if (ret)
834 return ret;
835 }
836
837 /* reject any command that we don't have a handler for */
838 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
839 return TCM_UNSUPPORTED_SCSI_OPCODE;
840
841 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
842 unsigned long long end_lba;
843
844 end_lba = dev->transport->get_blocks(dev) + 1;
845 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
846 ((cmd->t_task_lba + sectors) > end_lba)) {
847 pr_err("cmd exceeds last lba %llu "
848 "(lba %llu, sectors %u)\n",
849 end_lba, cmd->t_task_lba, sectors);
850 return TCM_ADDRESS_OUT_OF_RANGE;
851 }
852
853 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
854 size = sbc_get_size(cmd, sectors);
855 }
856
857 return target_cmd_size_check(cmd, size);
858 }
859 EXPORT_SYMBOL(sbc_parse_cdb);
860
861 u32 sbc_get_device_type(struct se_device *dev)
862 {
863 return TYPE_DISK;
864 }
865 EXPORT_SYMBOL(sbc_get_device_type);
866
867 sense_reason_t
868 sbc_execute_unmap(struct se_cmd *cmd,
869 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
870 sector_t, sector_t),
871 void *priv)
872 {
873 struct se_device *dev = cmd->se_dev;
874 unsigned char *buf, *ptr = NULL;
875 sector_t lba;
876 int size;
877 u32 range;
878 sense_reason_t ret = 0;
879 int dl, bd_dl;
880
881 /* We never set ANC_SUP */
882 if (cmd->t_task_cdb[1])
883 return TCM_INVALID_CDB_FIELD;
884
885 if (cmd->data_length == 0) {
886 target_complete_cmd(cmd, SAM_STAT_GOOD);
887 return 0;
888 }
889
890 if (cmd->data_length < 8) {
891 pr_warn("UNMAP parameter list length %u too small\n",
892 cmd->data_length);
893 return TCM_PARAMETER_LIST_LENGTH_ERROR;
894 }
895
896 buf = transport_kmap_data_sg(cmd);
897 if (!buf)
898 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
899
900 dl = get_unaligned_be16(&buf[0]);
901 bd_dl = get_unaligned_be16(&buf[2]);
902
903 size = cmd->data_length - 8;
904 if (bd_dl > size)
905 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
906 cmd->data_length, bd_dl);
907 else
908 size = bd_dl;
909
910 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
911 ret = TCM_INVALID_PARAMETER_LIST;
912 goto err;
913 }
914
915 /* First UNMAP block descriptor starts at 8 byte offset */
916 ptr = &buf[8];
917 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
918 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
919
920 while (size >= 16) {
921 lba = get_unaligned_be64(&ptr[0]);
922 range = get_unaligned_be32(&ptr[8]);
923 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
924 (unsigned long long)lba, range);
925
926 if (range > dev->dev_attrib.max_unmap_lba_count) {
927 ret = TCM_INVALID_PARAMETER_LIST;
928 goto err;
929 }
930
931 if (lba + range > dev->transport->get_blocks(dev) + 1) {
932 ret = TCM_ADDRESS_OUT_OF_RANGE;
933 goto err;
934 }
935
936 ret = do_unmap_fn(cmd, priv, lba, range);
937 if (ret)
938 goto err;
939
940 ptr += 16;
941 size -= 16;
942 }
943
944 err:
945 transport_kunmap_data_sg(cmd);
946 if (!ret)
947 target_complete_cmd(cmd, GOOD);
948 return ret;
949 }
950 EXPORT_SYMBOL(sbc_execute_unmap);
Linux with added FPC-III support