2 * SCSI Block Commands (SBC) parsing and emulation.
4 * (c) Copyright 2002-2013 Datera, Inc.
6 * Nicholas A. Bellinger <nab@kernel.org>
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.
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.
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.
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>
30 #include <target/target_core_base.h>
31 #include <target/target_core_backend.h>
32 #include <target/target_core_fabric.h>
34 #include "target_core_internal.h"
35 #include "target_core_ua.h"
39 sbc_emulate_readcapacity(struct se_cmd
*cmd
)
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
);
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.
56 * In SBC-3, these fields are obsolete, but some SCSI
57 * compliance tests actually check this, so we might as well
60 if (!(cdb
[8] & 1) && !!(cdb
[2] | cdb
[3] | cdb
[4] | cdb
[5]))
61 return TCM_INVALID_CDB_FIELD
;
63 if (blocks_long
>= 0x00000000ffffffff)
66 blocks
= (u32
)blocks_long
;
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;
77 rbuf
= transport_kmap_data_sg(cmd
);
79 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
80 transport_kunmap_data_sg(cmd
);
83 target_complete_cmd(cmd
, GOOD
);
88 sbc_emulate_readcapacity_16(struct se_cmd
*cmd
)
90 struct se_device
*dev
= cmd
->se_dev
;
92 unsigned char buf
[32];
93 unsigned long long blocks
= dev
->transport
->get_blocks(dev
);
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;
109 * Set Thin Provisioning Enable bit following sbc3r22 in section
110 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
112 if (dev
->dev_attrib
.emulate_tpu
|| dev
->dev_attrib
.emulate_tpws
)
115 rbuf
= transport_kmap_data_sg(cmd
);
117 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
118 transport_kunmap_data_sg(cmd
);
121 target_complete_cmd(cmd
, GOOD
);
125 sector_t
sbc_get_write_same_sectors(struct se_cmd
*cmd
)
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]);
137 * Use the explicit range when non zero is supplied, otherwise calculate
138 * the remaining range based on ->get_blocks() - starting LBA.
143 return cmd
->se_dev
->transport
->get_blocks(cmd
->se_dev
) -
146 EXPORT_SYMBOL(sbc_get_write_same_sectors
);
148 static sense_reason_t
149 sbc_emulate_noop(struct se_cmd
*cmd
)
151 target_complete_cmd(cmd
, GOOD
);
155 static inline u32
sbc_get_size(struct se_cmd
*cmd
, u32 sectors
)
157 return cmd
->se_dev
->dev_attrib
.block_size
* sectors
;
160 static int sbc_check_valid_sectors(struct se_cmd
*cmd
)
162 struct se_device
*dev
= cmd
->se_dev
;
163 unsigned long long end_lba
;
166 sectors
= cmd
->data_length
/ dev
->dev_attrib
.block_size
;
167 end_lba
= dev
->transport
->get_blocks(dev
) + 1;
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
);
178 static inline u32
transport_get_sectors_6(unsigned char *cdb
)
181 * Use 8-bit sector value. SBC-3 says:
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
188 return cdb
[4] ? : 256;
191 static inline u32
transport_get_sectors_10(unsigned char *cdb
)
193 return (u32
)(cdb
[7] << 8) + cdb
[8];
196 static inline u32
transport_get_sectors_12(unsigned char *cdb
)
198 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
201 static inline u32
transport_get_sectors_16(unsigned char *cdb
)
203 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
204 (cdb
[12] << 8) + cdb
[13];
208 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
210 static inline u32
transport_get_sectors_32(unsigned char *cdb
)
212 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
213 (cdb
[30] << 8) + cdb
[31];
217 static inline u32
transport_lba_21(unsigned char *cdb
)
219 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
222 static inline u32
transport_lba_32(unsigned char *cdb
)
224 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
227 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
229 unsigned int __v1
, __v2
;
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];
234 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
238 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
240 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
242 unsigned int __v1
, __v2
;
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];
247 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
250 static sense_reason_t
251 sbc_setup_write_same(struct se_cmd
*cmd
, unsigned char *flags
, struct sbc_ops
*ops
)
253 unsigned int sectors
= sbc_get_write_same_sectors(cmd
);
255 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
256 pr_err("WRITE_SAME PBDATA and LBDATA"
257 " bits not supported for Block Discard"
259 return TCM_UNSUPPORTED_SCSI_OPCODE
;
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
;
267 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
268 * translated into block discard requests within backend code.
270 if (flags
[0] & 0x08) {
271 if (!ops
->execute_write_same_unmap
)
272 return TCM_UNSUPPORTED_SCSI_OPCODE
;
274 cmd
->execute_cmd
= ops
->execute_write_same_unmap
;
277 if (!ops
->execute_write_same
)
278 return TCM_UNSUPPORTED_SCSI_OPCODE
;
280 cmd
->execute_cmd
= ops
->execute_write_same
;
284 static sense_reason_t
xdreadwrite_callback(struct se_cmd
*cmd
)
286 unsigned char *buf
, *addr
;
287 struct scatterlist
*sg
;
289 sense_reason_t ret
= TCM_NO_SENSE
;
292 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
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.
302 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
304 pr_err("Unable to allocate xor_callback buf\n");
305 return TCM_OUT_OF_RESOURCES
;
308 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
309 * into the locally allocated *buf
311 sg_copy_to_buffer(cmd
->t_data_sg
,
317 * Now perform the XOR against the BIDI read memory located at
318 * cmd->t_mem_bidi_list
322 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
323 addr
= kmap_atomic(sg_page(sg
));
325 ret
= TCM_OUT_OF_RESOURCES
;
329 for (i
= 0; i
< sg
->length
; i
++)
330 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
332 offset
+= sg
->length
;
341 static sense_reason_t
342 sbc_execute_rw(struct se_cmd
*cmd
)
344 return cmd
->execute_rw(cmd
, cmd
->t_data_sg
, cmd
->t_data_nents
,
345 cmd
->data_direction
);
348 static sense_reason_t
compare_and_write_post(struct se_cmd
*cmd
)
350 struct se_device
*dev
= cmd
->se_dev
;
352 cmd
->se_cmd_flags
|= SCF_COMPARE_AND_WRITE_POST
;
354 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
355 * before the original READ I/O submission.
362 static sense_reason_t
compare_and_write_callback(struct se_cmd
*cmd
)
364 struct se_device
*dev
= cmd
->se_dev
;
365 struct scatterlist
*write_sg
= NULL
, *sg
;
366 unsigned char *buf
, *addr
;
367 struct sg_mapping_iter m
;
368 unsigned int offset
= 0, len
;
369 unsigned int nlbas
= cmd
->t_task_nolb
;
370 unsigned int block_size
= dev
->dev_attrib
.block_size
;
371 unsigned int compare_len
= (nlbas
* block_size
);
372 sense_reason_t ret
= TCM_NO_SENSE
;
376 * Handle early failure in transport_generic_request_failure(),
377 * which will not have taken ->caw_mutex yet..
379 if (!cmd
->t_data_sg
|| !cmd
->t_bidi_data_sg
)
382 buf
= kzalloc(cmd
->data_length
, GFP_KERNEL
);
384 pr_err("Unable to allocate compare_and_write buf\n");
385 ret
= TCM_OUT_OF_RESOURCES
;
389 write_sg
= kzalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
392 pr_err("Unable to allocate compare_and_write sg\n");
393 ret
= TCM_OUT_OF_RESOURCES
;
397 * Setup verify and write data payloads from total NumberLBAs.
399 rc
= sg_copy_to_buffer(cmd
->t_data_sg
, cmd
->t_data_nents
, buf
,
402 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
403 ret
= TCM_OUT_OF_RESOURCES
;
407 * Compare against SCSI READ payload against verify payload
409 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, i
) {
410 addr
= (unsigned char *)kmap_atomic(sg_page(sg
));
412 ret
= TCM_OUT_OF_RESOURCES
;
416 len
= min(sg
->length
, compare_len
);
418 if (memcmp(addr
, buf
+ offset
, len
)) {
419 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
433 len
= cmd
->t_task_nolb
* block_size
;
434 sg_miter_start(&m
, cmd
->t_data_sg
, cmd
->t_data_nents
, SG_MITER_TO_SG
);
436 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
441 if (block_size
< PAGE_SIZE
) {
442 sg_set_page(&write_sg
[i
], m
.page
, block_size
,
446 sg_set_page(&write_sg
[i
], m
.page
, block_size
,
454 * Save the original SGL + nents values before updating to new
455 * assignments, to be released in transport_free_pages() ->
456 * transport_reset_sgl_orig()
458 cmd
->t_data_sg_orig
= cmd
->t_data_sg
;
459 cmd
->t_data_sg
= write_sg
;
460 cmd
->t_data_nents_orig
= cmd
->t_data_nents
;
461 cmd
->t_data_nents
= 1;
463 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
464 cmd
->transport_complete_callback
= compare_and_write_post
;
466 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
467 * for submitting the adjusted SGL to write instance user-data.
469 cmd
->execute_cmd
= sbc_execute_rw
;
471 spin_lock_irq(&cmd
->t_state_lock
);
472 cmd
->t_state
= TRANSPORT_PROCESSING
;
473 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
474 spin_unlock_irq(&cmd
->t_state_lock
);
476 __target_execute_cmd(cmd
);
482 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
483 dev
->transport
->name
);
484 ret
= TCM_MISCOMPARE_VERIFY
;
487 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
488 * sbc_compare_and_write() before the original READ I/O submission.
496 static sense_reason_t
497 sbc_compare_and_write(struct se_cmd
*cmd
)
499 struct se_device
*dev
= cmd
->se_dev
;
503 * Submit the READ first for COMPARE_AND_WRITE to perform the
504 * comparision using SGLs at cmd->t_bidi_data_sg..
506 rc
= down_interruptible(&dev
->caw_sem
);
507 if ((rc
!= 0) || signal_pending(current
)) {
508 cmd
->transport_complete_callback
= NULL
;
509 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
512 ret
= cmd
->execute_rw(cmd
, cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
,
515 cmd
->transport_complete_callback
= NULL
;
520 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
521 * upon MISCOMPARE, or in compare_and_write_done() upon completion
522 * of WRITE instance user-data.
528 sbc_parse_cdb(struct se_cmd
*cmd
, struct sbc_ops
*ops
)
530 struct se_device
*dev
= cmd
->se_dev
;
531 unsigned char *cdb
= cmd
->t_task_cdb
;
538 sectors
= transport_get_sectors_6(cdb
);
539 cmd
->t_task_lba
= transport_lba_21(cdb
);
540 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
541 cmd
->execute_rw
= ops
->execute_rw
;
542 cmd
->execute_cmd
= sbc_execute_rw
;
545 sectors
= transport_get_sectors_10(cdb
);
546 cmd
->t_task_lba
= transport_lba_32(cdb
);
547 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
548 cmd
->execute_rw
= ops
->execute_rw
;
549 cmd
->execute_cmd
= sbc_execute_rw
;
552 sectors
= transport_get_sectors_12(cdb
);
553 cmd
->t_task_lba
= transport_lba_32(cdb
);
554 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
555 cmd
->execute_rw
= ops
->execute_rw
;
556 cmd
->execute_cmd
= sbc_execute_rw
;
559 sectors
= transport_get_sectors_16(cdb
);
560 cmd
->t_task_lba
= transport_lba_64(cdb
);
561 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
562 cmd
->execute_rw
= ops
->execute_rw
;
563 cmd
->execute_cmd
= sbc_execute_rw
;
566 sectors
= transport_get_sectors_6(cdb
);
567 cmd
->t_task_lba
= transport_lba_21(cdb
);
568 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
569 cmd
->execute_rw
= ops
->execute_rw
;
570 cmd
->execute_cmd
= sbc_execute_rw
;
574 sectors
= transport_get_sectors_10(cdb
);
575 cmd
->t_task_lba
= transport_lba_32(cdb
);
577 cmd
->se_cmd_flags
|= SCF_FUA
;
578 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
579 cmd
->execute_rw
= ops
->execute_rw
;
580 cmd
->execute_cmd
= sbc_execute_rw
;
583 sectors
= transport_get_sectors_12(cdb
);
584 cmd
->t_task_lba
= transport_lba_32(cdb
);
586 cmd
->se_cmd_flags
|= SCF_FUA
;
587 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
588 cmd
->execute_rw
= ops
->execute_rw
;
589 cmd
->execute_cmd
= sbc_execute_rw
;
592 sectors
= transport_get_sectors_16(cdb
);
593 cmd
->t_task_lba
= transport_lba_64(cdb
);
595 cmd
->se_cmd_flags
|= SCF_FUA
;
596 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
597 cmd
->execute_rw
= ops
->execute_rw
;
598 cmd
->execute_cmd
= sbc_execute_rw
;
601 if (cmd
->data_direction
!= DMA_TO_DEVICE
||
602 !(cmd
->se_cmd_flags
& SCF_BIDI
))
603 return TCM_INVALID_CDB_FIELD
;
604 sectors
= transport_get_sectors_10(cdb
);
606 cmd
->t_task_lba
= transport_lba_32(cdb
);
607 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
610 * Setup BIDI XOR callback to be run after I/O completion.
612 cmd
->execute_rw
= ops
->execute_rw
;
613 cmd
->execute_cmd
= sbc_execute_rw
;
614 cmd
->transport_complete_callback
= &xdreadwrite_callback
;
616 cmd
->se_cmd_flags
|= SCF_FUA
;
618 case VARIABLE_LENGTH_CMD
:
620 u16 service_action
= get_unaligned_be16(&cdb
[8]);
621 switch (service_action
) {
623 sectors
= transport_get_sectors_32(cdb
);
626 * Use WRITE_32 and READ_32 opcodes for the emulated
627 * XDWRITE_READ_32 logic.
629 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
630 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
633 * Setup BIDI XOR callback to be run during after I/O
636 cmd
->execute_rw
= ops
->execute_rw
;
637 cmd
->execute_cmd
= sbc_execute_rw
;
638 cmd
->transport_complete_callback
= &xdreadwrite_callback
;
640 cmd
->se_cmd_flags
|= SCF_FUA
;
643 sectors
= transport_get_sectors_32(cdb
);
645 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
647 return TCM_INVALID_CDB_FIELD
;
650 size
= sbc_get_size(cmd
, 1);
651 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
653 ret
= sbc_setup_write_same(cmd
, &cdb
[10], ops
);
658 pr_err("VARIABLE_LENGTH_CMD service action"
659 " 0x%04x not supported\n", service_action
);
660 return TCM_UNSUPPORTED_SCSI_OPCODE
;
664 case COMPARE_AND_WRITE
:
667 * Currently enforce COMPARE_AND_WRITE for a single sector
670 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
671 " than 1\n", sectors
);
672 return TCM_INVALID_CDB_FIELD
;
675 * Double size because we have two buffers, note that
676 * zero is not an error..
678 size
= 2 * sbc_get_size(cmd
, sectors
);
679 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
680 cmd
->t_task_nolb
= sectors
;
681 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
| SCF_COMPARE_AND_WRITE
;
682 cmd
->execute_rw
= ops
->execute_rw
;
683 cmd
->execute_cmd
= sbc_compare_and_write
;
684 cmd
->transport_complete_callback
= compare_and_write_callback
;
688 cmd
->execute_cmd
= sbc_emulate_readcapacity
;
690 case SERVICE_ACTION_IN
:
691 switch (cmd
->t_task_cdb
[1] & 0x1f) {
692 case SAI_READ_CAPACITY_16
:
693 cmd
->execute_cmd
= sbc_emulate_readcapacity_16
;
696 pr_err("Unsupported SA: 0x%02x\n",
697 cmd
->t_task_cdb
[1] & 0x1f);
698 return TCM_INVALID_CDB_FIELD
;
700 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
701 (cdb
[12] << 8) | cdb
[13];
703 case SYNCHRONIZE_CACHE
:
704 case SYNCHRONIZE_CACHE_16
:
705 if (!ops
->execute_sync_cache
) {
707 cmd
->execute_cmd
= sbc_emulate_noop
;
712 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
714 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
715 sectors
= transport_get_sectors_10(cdb
);
716 cmd
->t_task_lba
= transport_lba_32(cdb
);
718 sectors
= transport_get_sectors_16(cdb
);
719 cmd
->t_task_lba
= transport_lba_64(cdb
);
722 size
= sbc_get_size(cmd
, sectors
);
725 * Check to ensure that LBA + Range does not exceed past end of
726 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
728 if (cmd
->t_task_lba
|| sectors
) {
729 if (sbc_check_valid_sectors(cmd
) < 0)
730 return TCM_ADDRESS_OUT_OF_RANGE
;
732 cmd
->execute_cmd
= ops
->execute_sync_cache
;
735 if (!ops
->execute_unmap
)
736 return TCM_UNSUPPORTED_SCSI_OPCODE
;
738 size
= get_unaligned_be16(&cdb
[7]);
739 cmd
->execute_cmd
= ops
->execute_unmap
;
742 sectors
= transport_get_sectors_16(cdb
);
744 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
745 return TCM_INVALID_CDB_FIELD
;
748 size
= sbc_get_size(cmd
, 1);
749 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
751 ret
= sbc_setup_write_same(cmd
, &cdb
[1], ops
);
756 sectors
= transport_get_sectors_10(cdb
);
758 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
759 return TCM_INVALID_CDB_FIELD
;
762 size
= sbc_get_size(cmd
, 1);
763 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
766 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
767 * of byte 1 bit 3 UNMAP instead of original reserved field
769 ret
= sbc_setup_write_same(cmd
, &cdb
[1], ops
);
775 cmd
->execute_cmd
= sbc_emulate_noop
;
781 * There are still clients out there which use these old SCSI-2
782 * commands. This mainly happens when running VMs with legacy
783 * guest systems, connected via SCSI command pass-through to
784 * iSCSI targets. Make them happy and return status GOOD.
787 cmd
->execute_cmd
= sbc_emulate_noop
;
790 ret
= spc_parse_cdb(cmd
, &size
);
795 /* reject any command that we don't have a handler for */
796 if (!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) && !cmd
->execute_cmd
)
797 return TCM_UNSUPPORTED_SCSI_OPCODE
;
799 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) {
800 unsigned long long end_lba
;
802 if (sectors
> dev
->dev_attrib
.fabric_max_sectors
) {
803 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
804 " big sectors %u exceeds fabric_max_sectors:"
805 " %u\n", cdb
[0], sectors
,
806 dev
->dev_attrib
.fabric_max_sectors
);
807 return TCM_INVALID_CDB_FIELD
;
809 if (sectors
> dev
->dev_attrib
.hw_max_sectors
) {
810 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
811 " big sectors %u exceeds backend hw_max_sectors:"
812 " %u\n", cdb
[0], sectors
,
813 dev
->dev_attrib
.hw_max_sectors
);
814 return TCM_INVALID_CDB_FIELD
;
817 end_lba
= dev
->transport
->get_blocks(dev
) + 1;
818 if (cmd
->t_task_lba
+ sectors
> end_lba
) {
819 pr_err("cmd exceeds last lba %llu "
820 "(lba %llu, sectors %u)\n",
821 end_lba
, cmd
->t_task_lba
, sectors
);
822 return TCM_ADDRESS_OUT_OF_RANGE
;
825 if (!(cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
))
826 size
= sbc_get_size(cmd
, sectors
);
829 return target_cmd_size_check(cmd
, size
);
831 EXPORT_SYMBOL(sbc_parse_cdb
);
833 u32
sbc_get_device_type(struct se_device
*dev
)
837 EXPORT_SYMBOL(sbc_get_device_type
);
840 sbc_execute_unmap(struct se_cmd
*cmd
,
841 sense_reason_t (*do_unmap_fn
)(struct se_cmd
*, void *,
845 struct se_device
*dev
= cmd
->se_dev
;
846 unsigned char *buf
, *ptr
= NULL
;
850 sense_reason_t ret
= 0;
853 /* We never set ANC_SUP */
854 if (cmd
->t_task_cdb
[1])
855 return TCM_INVALID_CDB_FIELD
;
857 if (cmd
->data_length
== 0) {
858 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
862 if (cmd
->data_length
< 8) {
863 pr_warn("UNMAP parameter list length %u too small\n",
865 return TCM_PARAMETER_LIST_LENGTH_ERROR
;
868 buf
= transport_kmap_data_sg(cmd
);
870 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
872 dl
= get_unaligned_be16(&buf
[0]);
873 bd_dl
= get_unaligned_be16(&buf
[2]);
875 size
= cmd
->data_length
- 8;
877 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
878 cmd
->data_length
, bd_dl
);
882 if (size
/ 16 > dev
->dev_attrib
.max_unmap_block_desc_count
) {
883 ret
= TCM_INVALID_PARAMETER_LIST
;
887 /* First UNMAP block descriptor starts at 8 byte offset */
889 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
890 " ptr: %p\n", dev
->transport
->name
, dl
, bd_dl
, size
, ptr
);
893 lba
= get_unaligned_be64(&ptr
[0]);
894 range
= get_unaligned_be32(&ptr
[8]);
895 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
896 (unsigned long long)lba
, range
);
898 if (range
> dev
->dev_attrib
.max_unmap_lba_count
) {
899 ret
= TCM_INVALID_PARAMETER_LIST
;
903 if (lba
+ range
> dev
->transport
->get_blocks(dev
) + 1) {
904 ret
= TCM_ADDRESS_OUT_OF_RANGE
;
908 ret
= do_unmap_fn(cmd
, priv
, lba
, range
);
917 transport_kunmap_data_sg(cmd
);
919 target_complete_cmd(cmd
, GOOD
);
922 EXPORT_SYMBOL(sbc_execute_unmap
);