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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / target / target_core_sbc.c
blob214522282c19e2fb4a488e2f6d961795b3be0187
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 unsigned int sectors = sbc_get_write_same_sectors(cmd);
254
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");
259 return TCM_UNSUPPORTED_SCSI_OPCODE;
260 }
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 }
266 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
267 if (flags[0] & 0x10) {
268 pr_warn("WRITE SAME with ANCHOR not supported\n");
269 return TCM_INVALID_CDB_FIELD;
270 }
271 /*
272 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
273 * translated into block discard requests within backend code.
274 */
275 if (flags[0] & 0x08) {
276 if (!ops->execute_write_same_unmap)
277 return TCM_UNSUPPORTED_SCSI_OPCODE;
278
279 cmd->execute_cmd = ops->execute_write_same_unmap;
280 return 0;
281 }
282 if (!ops->execute_write_same)
283 return TCM_UNSUPPORTED_SCSI_OPCODE;
284
285 cmd->execute_cmd = ops->execute_write_same;
286 return 0;
287 }
288
289 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
290 {
291 unsigned char *buf, *addr;
292 struct scatterlist *sg;
293 unsigned int offset;
294 sense_reason_t ret = TCM_NO_SENSE;
295 int i, count;
296 /*
297 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
298 *
299 * 1) read the specified logical block(s);
300 * 2) transfer logical blocks from the data-out buffer;
301 * 3) XOR the logical blocks transferred from the data-out buffer with
302 * the logical blocks read, storing the resulting XOR data in a buffer;
303 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
304 * blocks transferred from the data-out buffer; and
305 * 5) transfer the resulting XOR data to the data-in buffer.
306 */
307 buf = kmalloc(cmd->data_length, GFP_KERNEL);
308 if (!buf) {
309 pr_err("Unable to allocate xor_callback buf\n");
310 return TCM_OUT_OF_RESOURCES;
311 }
312 /*
313 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
314 * into the locally allocated *buf
315 */
316 sg_copy_to_buffer(cmd->t_data_sg,
317 cmd->t_data_nents,
318 buf,
319 cmd->data_length);
320
321 /*
322 * Now perform the XOR against the BIDI read memory located at
323 * cmd->t_mem_bidi_list
324 */
325
326 offset = 0;
327 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
328 addr = kmap_atomic(sg_page(sg));
329 if (!addr) {
330 ret = TCM_OUT_OF_RESOURCES;
331 goto out;
332 }
333
334 for (i = 0; i < sg->length; i++)
335 *(addr + sg->offset + i) ^= *(buf + offset + i);
336
337 offset += sg->length;
338 kunmap_atomic(addr);
339 }
340
341 out:
342 kfree(buf);
343 return ret;
344 }
345
346 static sense_reason_t
347 sbc_execute_rw(struct se_cmd *cmd)
348 {
349 return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
350 cmd->data_direction);
351 }
352
353 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
354 {
355 struct se_device *dev = cmd->se_dev;
356
357 /*
358 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
359 * within target_complete_ok_work() if the command was successfully
360 * sent to the backend driver.
361 */
362 spin_lock_irq(&cmd->t_state_lock);
363 if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
364 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
365 spin_unlock_irq(&cmd->t_state_lock);
366
367 /*
368 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
369 * before the original READ I/O submission.
370 */
371 up(&dev->caw_sem);
372
373 return TCM_NO_SENSE;
374 }
375
376 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
377 {
378 struct se_device *dev = cmd->se_dev;
379 struct scatterlist *write_sg = NULL, *sg;
380 unsigned char *buf = NULL, *addr;
381 struct sg_mapping_iter m;
382 unsigned int offset = 0, len;
383 unsigned int nlbas = cmd->t_task_nolb;
384 unsigned int block_size = dev->dev_attrib.block_size;
385 unsigned int compare_len = (nlbas * block_size);
386 sense_reason_t ret = TCM_NO_SENSE;
387 int rc, i;
388
389 /*
390 * Handle early failure in transport_generic_request_failure(),
391 * which will not have taken ->caw_mutex yet..
392 */
393 if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
394 return TCM_NO_SENSE;
395 /*
396 * Immediately exit + release dev->caw_sem if command has already
397 * been failed with a non-zero SCSI status.
398 */
399 if (cmd->scsi_status) {
400 pr_err("compare_and_write_callback: non zero scsi_status:"
401 " 0x%02x\n", cmd->scsi_status);
402 goto out;
403 }
404
405 buf = kzalloc(cmd->data_length, GFP_KERNEL);
406 if (!buf) {
407 pr_err("Unable to allocate compare_and_write buf\n");
408 ret = TCM_OUT_OF_RESOURCES;
409 goto out;
410 }
411
412 write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
413 GFP_KERNEL);
414 if (!write_sg) {
415 pr_err("Unable to allocate compare_and_write sg\n");
416 ret = TCM_OUT_OF_RESOURCES;
417 goto out;
418 }
419 sg_init_table(write_sg, cmd->t_data_nents);
420 /*
421 * Setup verify and write data payloads from total NumberLBAs.
422 */
423 rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
424 cmd->data_length);
425 if (!rc) {
426 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
427 ret = TCM_OUT_OF_RESOURCES;
428 goto out;
429 }
430 /*
431 * Compare against SCSI READ payload against verify payload
432 */
433 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
434 addr = (unsigned char *)kmap_atomic(sg_page(sg));
435 if (!addr) {
436 ret = TCM_OUT_OF_RESOURCES;
437 goto out;
438 }
439
440 len = min(sg->length, compare_len);
441
442 if (memcmp(addr, buf + offset, len)) {
443 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
444 addr, buf + offset);
445 kunmap_atomic(addr);
446 goto miscompare;
447 }
448 kunmap_atomic(addr);
449
450 offset += len;
451 compare_len -= len;
452 if (!compare_len)
453 break;
454 }
455
456 i = 0;
457 len = cmd->t_task_nolb * block_size;
458 sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
459 /*
460 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
461 */
462 while (len) {
463 sg_miter_next(&m);
464
465 if (block_size < PAGE_SIZE) {
466 sg_set_page(&write_sg[i], m.page, block_size,
467 block_size);
468 } else {
469 sg_miter_next(&m);
470 sg_set_page(&write_sg[i], m.page, block_size,
471 0);
472 }
473 len -= block_size;
474 i++;
475 }
476 sg_miter_stop(&m);
477 /*
478 * Save the original SGL + nents values before updating to new
479 * assignments, to be released in transport_free_pages() ->
480 * transport_reset_sgl_orig()
481 */
482 cmd->t_data_sg_orig = cmd->t_data_sg;
483 cmd->t_data_sg = write_sg;
484 cmd->t_data_nents_orig = cmd->t_data_nents;
485 cmd->t_data_nents = 1;
486
487 cmd->sam_task_attr = MSG_HEAD_TAG;
488 cmd->transport_complete_callback = compare_and_write_post;
489 /*
490 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
491 * for submitting the adjusted SGL to write instance user-data.
492 */
493 cmd->execute_cmd = sbc_execute_rw;
494
495 spin_lock_irq(&cmd->t_state_lock);
496 cmd->t_state = TRANSPORT_PROCESSING;
497 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
498 spin_unlock_irq(&cmd->t_state_lock);
499
500 __target_execute_cmd(cmd);
501
502 kfree(buf);
503 return ret;
504
505 miscompare:
506 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
507 dev->transport->name);
508 ret = TCM_MISCOMPARE_VERIFY;
509 out:
510 /*
511 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
512 * sbc_compare_and_write() before the original READ I/O submission.
513 */
514 up(&dev->caw_sem);
515 kfree(write_sg);
516 kfree(buf);
517 return ret;
518 }
519
520 static sense_reason_t
521 sbc_compare_and_write(struct se_cmd *cmd)
522 {
523 struct se_device *dev = cmd->se_dev;
524 sense_reason_t ret;
525 int rc;
526 /*
527 * Submit the READ first for COMPARE_AND_WRITE to perform the
528 * comparision using SGLs at cmd->t_bidi_data_sg..
529 */
530 rc = down_interruptible(&dev->caw_sem);
531 if ((rc != 0) || signal_pending(current)) {
532 cmd->transport_complete_callback = NULL;
533 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
534 }
535 /*
536 * Reset cmd->data_length to individual block_size in order to not
537 * confuse backend drivers that depend on this value matching the
538 * size of the I/O being submitted.
539 */
540 cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
541
542 ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
543 DMA_FROM_DEVICE);
544 if (ret) {
545 cmd->transport_complete_callback = NULL;
546 up(&dev->caw_sem);
547 return ret;
548 }
549 /*
550 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
551 * upon MISCOMPARE, or in compare_and_write_done() upon completion
552 * of WRITE instance user-data.
553 */
554 return TCM_NO_SENSE;
555 }
556
557 sense_reason_t
558 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
559 {
560 struct se_device *dev = cmd->se_dev;
561 unsigned char *cdb = cmd->t_task_cdb;
562 unsigned int size;
563 u32 sectors = 0;
564 sense_reason_t ret;
565
566 switch (cdb[0]) {
567 case READ_6:
568 sectors = transport_get_sectors_6(cdb);
569 cmd->t_task_lba = transport_lba_21(cdb);
570 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
571 cmd->execute_rw = ops->execute_rw;
572 cmd->execute_cmd = sbc_execute_rw;
573 break;
574 case READ_10:
575 sectors = transport_get_sectors_10(cdb);
576 cmd->t_task_lba = transport_lba_32(cdb);
577 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
578 cmd->execute_rw = ops->execute_rw;
579 cmd->execute_cmd = sbc_execute_rw;
580 break;
581 case READ_12:
582 sectors = transport_get_sectors_12(cdb);
583 cmd->t_task_lba = transport_lba_32(cdb);
584 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
585 cmd->execute_rw = ops->execute_rw;
586 cmd->execute_cmd = sbc_execute_rw;
587 break;
588 case READ_16:
589 sectors = transport_get_sectors_16(cdb);
590 cmd->t_task_lba = transport_lba_64(cdb);
591 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
592 cmd->execute_rw = ops->execute_rw;
593 cmd->execute_cmd = sbc_execute_rw;
594 break;
595 case WRITE_6:
596 sectors = transport_get_sectors_6(cdb);
597 cmd->t_task_lba = transport_lba_21(cdb);
598 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
599 cmd->execute_rw = ops->execute_rw;
600 cmd->execute_cmd = sbc_execute_rw;
601 break;
602 case WRITE_10:
603 case WRITE_VERIFY:
604 sectors = transport_get_sectors_10(cdb);
605 cmd->t_task_lba = transport_lba_32(cdb);
606 if (cdb[1] & 0x8)
607 cmd->se_cmd_flags |= SCF_FUA;
608 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
609 cmd->execute_rw = ops->execute_rw;
610 cmd->execute_cmd = sbc_execute_rw;
611 break;
612 case WRITE_12:
613 sectors = transport_get_sectors_12(cdb);
614 cmd->t_task_lba = transport_lba_32(cdb);
615 if (cdb[1] & 0x8)
616 cmd->se_cmd_flags |= SCF_FUA;
617 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
618 cmd->execute_rw = ops->execute_rw;
619 cmd->execute_cmd = sbc_execute_rw;
620 break;
621 case WRITE_16:
622 sectors = transport_get_sectors_16(cdb);
623 cmd->t_task_lba = transport_lba_64(cdb);
624 if (cdb[1] & 0x8)
625 cmd->se_cmd_flags |= SCF_FUA;
626 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
627 cmd->execute_rw = ops->execute_rw;
628 cmd->execute_cmd = sbc_execute_rw;
629 break;
630 case XDWRITEREAD_10:
631 if (cmd->data_direction != DMA_TO_DEVICE ||
632 !(cmd->se_cmd_flags & SCF_BIDI))
633 return TCM_INVALID_CDB_FIELD;
634 sectors = transport_get_sectors_10(cdb);
635
636 cmd->t_task_lba = transport_lba_32(cdb);
637 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
638
639 /*
640 * Setup BIDI XOR callback to be run after I/O completion.
641 */
642 cmd->execute_rw = ops->execute_rw;
643 cmd->execute_cmd = sbc_execute_rw;
644 cmd->transport_complete_callback = &xdreadwrite_callback;
645 if (cdb[1] & 0x8)
646 cmd->se_cmd_flags |= SCF_FUA;
647 break;
648 case VARIABLE_LENGTH_CMD:
649 {
650 u16 service_action = get_unaligned_be16(&cdb[8]);
651 switch (service_action) {
652 case XDWRITEREAD_32:
653 sectors = transport_get_sectors_32(cdb);
654
655 /*
656 * Use WRITE_32 and READ_32 opcodes for the emulated
657 * XDWRITE_READ_32 logic.
658 */
659 cmd->t_task_lba = transport_lba_64_ext(cdb);
660 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
661
662 /*
663 * Setup BIDI XOR callback to be run during after I/O
664 * completion.
665 */
666 cmd->execute_rw = ops->execute_rw;
667 cmd->execute_cmd = sbc_execute_rw;
668 cmd->transport_complete_callback = &xdreadwrite_callback;
669 if (cdb[1] & 0x8)
670 cmd->se_cmd_flags |= SCF_FUA;
671 break;
672 case WRITE_SAME_32:
673 sectors = transport_get_sectors_32(cdb);
674 if (!sectors) {
675 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
676 " supported\n");
677 return TCM_INVALID_CDB_FIELD;
678 }
679
680 size = sbc_get_size(cmd, 1);
681 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
682
683 ret = sbc_setup_write_same(cmd, &cdb[10], ops);
684 if (ret)
685 return ret;
686 break;
687 default:
688 pr_err("VARIABLE_LENGTH_CMD service action"
689 " 0x%04x not supported\n", service_action);
690 return TCM_UNSUPPORTED_SCSI_OPCODE;
691 }
692 break;
693 }
694 case COMPARE_AND_WRITE:
695 sectors = cdb[13];
696 /*
697 * Currently enforce COMPARE_AND_WRITE for a single sector
698 */
699 if (sectors > 1) {
700 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
701 " than 1\n", sectors);
702 return TCM_INVALID_CDB_FIELD;
703 }
704 /*
705 * Double size because we have two buffers, note that
706 * zero is not an error..
707 */
708 size = 2 * sbc_get_size(cmd, sectors);
709 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
710 cmd->t_task_nolb = sectors;
711 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
712 cmd->execute_rw = ops->execute_rw;
713 cmd->execute_cmd = sbc_compare_and_write;
714 cmd->transport_complete_callback = compare_and_write_callback;
715 break;
716 case READ_CAPACITY:
717 size = READ_CAP_LEN;
718 cmd->execute_cmd = sbc_emulate_readcapacity;
719 break;
720 case SERVICE_ACTION_IN:
721 switch (cmd->t_task_cdb[1] & 0x1f) {
722 case SAI_READ_CAPACITY_16:
723 cmd->execute_cmd = sbc_emulate_readcapacity_16;
724 break;
725 default:
726 pr_err("Unsupported SA: 0x%02x\n",
727 cmd->t_task_cdb[1] & 0x1f);
728 return TCM_INVALID_CDB_FIELD;
729 }
730 size = (cdb[10] << 24) | (cdb[11] << 16) |
731 (cdb[12] << 8) | cdb[13];
732 break;
733 case SYNCHRONIZE_CACHE:
734 case SYNCHRONIZE_CACHE_16:
735 if (!ops->execute_sync_cache) {
736 size = 0;
737 cmd->execute_cmd = sbc_emulate_noop;
738 break;
739 }
740
741 /*
742 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
743 */
744 if (cdb[0] == SYNCHRONIZE_CACHE) {
745 sectors = transport_get_sectors_10(cdb);
746 cmd->t_task_lba = transport_lba_32(cdb);
747 } else {
748 sectors = transport_get_sectors_16(cdb);
749 cmd->t_task_lba = transport_lba_64(cdb);
750 }
751
752 size = sbc_get_size(cmd, sectors);
753
754 /*
755 * Check to ensure that LBA + Range does not exceed past end of
756 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
757 */
758 if (cmd->t_task_lba || sectors) {
759 if (sbc_check_valid_sectors(cmd) < 0)
760 return TCM_ADDRESS_OUT_OF_RANGE;
761 }
762 cmd->execute_cmd = ops->execute_sync_cache;
763 break;
764 case UNMAP:
765 if (!ops->execute_unmap)
766 return TCM_UNSUPPORTED_SCSI_OPCODE;
767
768 size = get_unaligned_be16(&cdb[7]);
769 cmd->execute_cmd = ops->execute_unmap;
770 break;
771 case WRITE_SAME_16:
772 sectors = transport_get_sectors_16(cdb);
773 if (!sectors) {
774 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
775 return TCM_INVALID_CDB_FIELD;
776 }
777
778 size = sbc_get_size(cmd, 1);
779 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
780
781 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
782 if (ret)
783 return ret;
784 break;
785 case WRITE_SAME:
786 sectors = transport_get_sectors_10(cdb);
787 if (!sectors) {
788 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
789 return TCM_INVALID_CDB_FIELD;
790 }
791
792 size = sbc_get_size(cmd, 1);
793 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
794
795 /*
796 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
797 * of byte 1 bit 3 UNMAP instead of original reserved field
798 */
799 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
800 if (ret)
801 return ret;
802 break;
803 case VERIFY:
804 size = 0;
805 cmd->execute_cmd = sbc_emulate_noop;
806 break;
807 case REZERO_UNIT:
808 case SEEK_6:
809 case SEEK_10:
810 /*
811 * There are still clients out there which use these old SCSI-2
812 * commands. This mainly happens when running VMs with legacy
813 * guest systems, connected via SCSI command pass-through to
814 * iSCSI targets. Make them happy and return status GOOD.
815 */
816 size = 0;
817 cmd->execute_cmd = sbc_emulate_noop;
818 break;
819 default:
820 ret = spc_parse_cdb(cmd, &size);
821 if (ret)
822 return ret;
823 }
824
825 /* reject any command that we don't have a handler for */
826 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
827 return TCM_UNSUPPORTED_SCSI_OPCODE;
828
829 if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
830 unsigned long long end_lba;
831
832 if (sectors > dev->dev_attrib.fabric_max_sectors) {
833 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
834 " big sectors %u exceeds fabric_max_sectors:"
835 " %u\n", cdb[0], sectors,
836 dev->dev_attrib.fabric_max_sectors);
837 return TCM_INVALID_CDB_FIELD;
838 }
839 if (sectors > dev->dev_attrib.hw_max_sectors) {
840 printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
841 " big sectors %u exceeds backend hw_max_sectors:"
842 " %u\n", cdb[0], sectors,
843 dev->dev_attrib.hw_max_sectors);
844 return TCM_INVALID_CDB_FIELD;
845 }
846
847 end_lba = dev->transport->get_blocks(dev) + 1;
848 if (cmd->t_task_lba + sectors > end_lba) {
849 pr_err("cmd exceeds last lba %llu "
850 "(lba %llu, sectors %u)\n",
851 end_lba, cmd->t_task_lba, sectors);
852 return TCM_ADDRESS_OUT_OF_RANGE;
853 }
854
855 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
856 size = sbc_get_size(cmd, sectors);
857 }
858
859 return target_cmd_size_check(cmd, size);
860 }
861 EXPORT_SYMBOL(sbc_parse_cdb);
862
863 u32 sbc_get_device_type(struct se_device *dev)
864 {
865 return TYPE_DISK;
866 }
867 EXPORT_SYMBOL(sbc_get_device_type);
868
869 sense_reason_t
870 sbc_execute_unmap(struct se_cmd *cmd,
871 sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
872 sector_t, sector_t),
873 void *priv)
874 {
875 struct se_device *dev = cmd->se_dev;
876 unsigned char *buf, *ptr = NULL;
877 sector_t lba;
878 int size;
879 u32 range;
880 sense_reason_t ret = 0;
881 int dl, bd_dl;
882
883 /* We never set ANC_SUP */
884 if (cmd->t_task_cdb[1])
885 return TCM_INVALID_CDB_FIELD;
886
887 if (cmd->data_length == 0) {
888 target_complete_cmd(cmd, SAM_STAT_GOOD);
889 return 0;
890 }
891
892 if (cmd->data_length < 8) {
893 pr_warn("UNMAP parameter list length %u too small\n",
894 cmd->data_length);
895 return TCM_PARAMETER_LIST_LENGTH_ERROR;
896 }
897
898 buf = transport_kmap_data_sg(cmd);
899 if (!buf)
900 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
901
902 dl = get_unaligned_be16(&buf[0]);
903 bd_dl = get_unaligned_be16(&buf[2]);
904
905 size = cmd->data_length - 8;
906 if (bd_dl > size)
907 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
908 cmd->data_length, bd_dl);
909 else
910 size = bd_dl;
911
912 if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
913 ret = TCM_INVALID_PARAMETER_LIST;
914 goto err;
915 }
916
917 /* First UNMAP block descriptor starts at 8 byte offset */
918 ptr = &buf[8];
919 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
920 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
921
922 while (size >= 16) {
923 lba = get_unaligned_be64(&ptr[0]);
924 range = get_unaligned_be32(&ptr[8]);
925 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
926 (unsigned long long)lba, range);
927
928 if (range > dev->dev_attrib.max_unmap_lba_count) {
929 ret = TCM_INVALID_PARAMETER_LIST;
930 goto err;
931 }
932
933 if (lba + range > dev->transport->get_blocks(dev) + 1) {
934 ret = TCM_ADDRESS_OUT_OF_RANGE;
935 goto err;
936 }
937
938 ret = do_unmap_fn(cmd, priv, lba, range);
939 if (ret)
940 goto err;
941
942 ptr += 16;
943 size -= 16;
944 }
945
946 err:
947 transport_kunmap_data_sg(cmd);
948 if (!ret)
949 target_complete_cmd(cmd, GOOD);
950 return ret;
951 }
952 EXPORT_SYMBOL(sbc_execute_unmap);
Linux with added FPC-III support