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 if (dev
->transport
->get_lbppbe
)
110 buf
[13] = dev
->transport
->get_lbppbe(dev
) & 0x0f;
112 if (dev
->transport
->get_alignment_offset_lbas
) {
113 u16 lalba
= dev
->transport
->get_alignment_offset_lbas(dev
);
114 buf
[14] = (lalba
>> 8) & 0x3f;
115 buf
[15] = lalba
& 0xff;
119 * Set Thin Provisioning Enable bit following sbc3r22 in section
120 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
122 if (dev
->dev_attrib
.emulate_tpu
|| dev
->dev_attrib
.emulate_tpws
)
125 rbuf
= transport_kmap_data_sg(cmd
);
127 memcpy(rbuf
, buf
, min_t(u32
, sizeof(buf
), cmd
->data_length
));
128 transport_kunmap_data_sg(cmd
);
131 target_complete_cmd(cmd
, GOOD
);
135 sector_t
sbc_get_write_same_sectors(struct se_cmd
*cmd
)
139 if (cmd
->t_task_cdb
[0] == WRITE_SAME
)
140 num_blocks
= get_unaligned_be16(&cmd
->t_task_cdb
[7]);
141 else if (cmd
->t_task_cdb
[0] == WRITE_SAME_16
)
142 num_blocks
= get_unaligned_be32(&cmd
->t_task_cdb
[10]);
143 else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
144 num_blocks
= get_unaligned_be32(&cmd
->t_task_cdb
[28]);
147 * Use the explicit range when non zero is supplied, otherwise calculate
148 * the remaining range based on ->get_blocks() - starting LBA.
153 return cmd
->se_dev
->transport
->get_blocks(cmd
->se_dev
) -
156 EXPORT_SYMBOL(sbc_get_write_same_sectors
);
158 static sense_reason_t
159 sbc_emulate_noop(struct se_cmd
*cmd
)
161 target_complete_cmd(cmd
, GOOD
);
165 static inline u32
sbc_get_size(struct se_cmd
*cmd
, u32 sectors
)
167 return cmd
->se_dev
->dev_attrib
.block_size
* sectors
;
170 static int sbc_check_valid_sectors(struct se_cmd
*cmd
)
172 struct se_device
*dev
= cmd
->se_dev
;
173 unsigned long long end_lba
;
176 sectors
= cmd
->data_length
/ dev
->dev_attrib
.block_size
;
177 end_lba
= dev
->transport
->get_blocks(dev
) + 1;
179 if (cmd
->t_task_lba
+ sectors
> end_lba
) {
180 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
181 cmd
->t_task_lba
, sectors
, end_lba
);
188 static inline u32
transport_get_sectors_6(unsigned char *cdb
)
191 * Use 8-bit sector value. SBC-3 says:
193 * A TRANSFER LENGTH field set to zero specifies that 256
194 * logical blocks shall be written. Any other value
195 * specifies the number of logical blocks that shall be
198 return cdb
[4] ? : 256;
201 static inline u32
transport_get_sectors_10(unsigned char *cdb
)
203 return (u32
)(cdb
[7] << 8) + cdb
[8];
206 static inline u32
transport_get_sectors_12(unsigned char *cdb
)
208 return (u32
)(cdb
[6] << 24) + (cdb
[7] << 16) + (cdb
[8] << 8) + cdb
[9];
211 static inline u32
transport_get_sectors_16(unsigned char *cdb
)
213 return (u32
)(cdb
[10] << 24) + (cdb
[11] << 16) +
214 (cdb
[12] << 8) + cdb
[13];
218 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
220 static inline u32
transport_get_sectors_32(unsigned char *cdb
)
222 return (u32
)(cdb
[28] << 24) + (cdb
[29] << 16) +
223 (cdb
[30] << 8) + cdb
[31];
227 static inline u32
transport_lba_21(unsigned char *cdb
)
229 return ((cdb
[1] & 0x1f) << 16) | (cdb
[2] << 8) | cdb
[3];
232 static inline u32
transport_lba_32(unsigned char *cdb
)
234 return (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
237 static inline unsigned long long transport_lba_64(unsigned char *cdb
)
239 unsigned int __v1
, __v2
;
241 __v1
= (cdb
[2] << 24) | (cdb
[3] << 16) | (cdb
[4] << 8) | cdb
[5];
242 __v2
= (cdb
[6] << 24) | (cdb
[7] << 16) | (cdb
[8] << 8) | cdb
[9];
244 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
248 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
250 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb
)
252 unsigned int __v1
, __v2
;
254 __v1
= (cdb
[12] << 24) | (cdb
[13] << 16) | (cdb
[14] << 8) | cdb
[15];
255 __v2
= (cdb
[16] << 24) | (cdb
[17] << 16) | (cdb
[18] << 8) | cdb
[19];
257 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
260 static sense_reason_t
261 sbc_setup_write_same(struct se_cmd
*cmd
, unsigned char *flags
, struct sbc_ops
*ops
)
263 unsigned int sectors
= sbc_get_write_same_sectors(cmd
);
265 if ((flags
[0] & 0x04) || (flags
[0] & 0x02)) {
266 pr_err("WRITE_SAME PBDATA and LBDATA"
267 " bits not supported for Block Discard"
269 return TCM_UNSUPPORTED_SCSI_OPCODE
;
271 if (sectors
> cmd
->se_dev
->dev_attrib
.max_write_same_len
) {
272 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
273 sectors
, cmd
->se_dev
->dev_attrib
.max_write_same_len
);
274 return TCM_INVALID_CDB_FIELD
;
276 /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
277 if (flags
[0] & 0x10) {
278 pr_warn("WRITE SAME with ANCHOR not supported\n");
279 return TCM_INVALID_CDB_FIELD
;
282 * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
283 * translated into block discard requests within backend code.
285 if (flags
[0] & 0x08) {
286 if (!ops
->execute_write_same_unmap
)
287 return TCM_UNSUPPORTED_SCSI_OPCODE
;
289 cmd
->execute_cmd
= ops
->execute_write_same_unmap
;
292 if (!ops
->execute_write_same
)
293 return TCM_UNSUPPORTED_SCSI_OPCODE
;
295 cmd
->execute_cmd
= ops
->execute_write_same
;
299 static sense_reason_t
xdreadwrite_callback(struct se_cmd
*cmd
)
301 unsigned char *buf
, *addr
;
302 struct scatterlist
*sg
;
304 sense_reason_t ret
= TCM_NO_SENSE
;
307 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
309 * 1) read the specified logical block(s);
310 * 2) transfer logical blocks from the data-out buffer;
311 * 3) XOR the logical blocks transferred from the data-out buffer with
312 * the logical blocks read, storing the resulting XOR data in a buffer;
313 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
314 * blocks transferred from the data-out buffer; and
315 * 5) transfer the resulting XOR data to the data-in buffer.
317 buf
= kmalloc(cmd
->data_length
, GFP_KERNEL
);
319 pr_err("Unable to allocate xor_callback buf\n");
320 return TCM_OUT_OF_RESOURCES
;
323 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
324 * into the locally allocated *buf
326 sg_copy_to_buffer(cmd
->t_data_sg
,
332 * Now perform the XOR against the BIDI read memory located at
333 * cmd->t_mem_bidi_list
337 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, count
) {
338 addr
= kmap_atomic(sg_page(sg
));
340 ret
= TCM_OUT_OF_RESOURCES
;
344 for (i
= 0; i
< sg
->length
; i
++)
345 *(addr
+ sg
->offset
+ i
) ^= *(buf
+ offset
+ i
);
347 offset
+= sg
->length
;
356 static sense_reason_t
357 sbc_execute_rw(struct se_cmd
*cmd
)
359 return cmd
->execute_rw(cmd
, cmd
->t_data_sg
, cmd
->t_data_nents
,
360 cmd
->data_direction
);
363 static sense_reason_t
compare_and_write_post(struct se_cmd
*cmd
)
365 struct se_device
*dev
= cmd
->se_dev
;
368 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
369 * within target_complete_ok_work() if the command was successfully
370 * sent to the backend driver.
372 spin_lock_irq(&cmd
->t_state_lock
);
373 if ((cmd
->transport_state
& CMD_T_SENT
) && !cmd
->scsi_status
)
374 cmd
->se_cmd_flags
|= SCF_COMPARE_AND_WRITE_POST
;
375 spin_unlock_irq(&cmd
->t_state_lock
);
378 * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
379 * before the original READ I/O submission.
386 static sense_reason_t
compare_and_write_callback(struct se_cmd
*cmd
)
388 struct se_device
*dev
= cmd
->se_dev
;
389 struct scatterlist
*write_sg
= NULL
, *sg
;
390 unsigned char *buf
= NULL
, *addr
;
391 struct sg_mapping_iter m
;
392 unsigned int offset
= 0, len
;
393 unsigned int nlbas
= cmd
->t_task_nolb
;
394 unsigned int block_size
= dev
->dev_attrib
.block_size
;
395 unsigned int compare_len
= (nlbas
* block_size
);
396 sense_reason_t ret
= TCM_NO_SENSE
;
400 * Handle early failure in transport_generic_request_failure(),
401 * which will not have taken ->caw_mutex yet..
403 if (!cmd
->t_data_sg
|| !cmd
->t_bidi_data_sg
)
406 * Immediately exit + release dev->caw_sem if command has already
407 * been failed with a non-zero SCSI status.
409 if (cmd
->scsi_status
) {
410 pr_err("compare_and_write_callback: non zero scsi_status:"
411 " 0x%02x\n", cmd
->scsi_status
);
415 buf
= kzalloc(cmd
->data_length
, GFP_KERNEL
);
417 pr_err("Unable to allocate compare_and_write buf\n");
418 ret
= TCM_OUT_OF_RESOURCES
;
422 write_sg
= kzalloc(sizeof(struct scatterlist
) * cmd
->t_data_nents
,
425 pr_err("Unable to allocate compare_and_write sg\n");
426 ret
= TCM_OUT_OF_RESOURCES
;
430 * Setup verify and write data payloads from total NumberLBAs.
432 rc
= sg_copy_to_buffer(cmd
->t_data_sg
, cmd
->t_data_nents
, buf
,
435 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
436 ret
= TCM_OUT_OF_RESOURCES
;
440 * Compare against SCSI READ payload against verify payload
442 for_each_sg(cmd
->t_bidi_data_sg
, sg
, cmd
->t_bidi_data_nents
, i
) {
443 addr
= (unsigned char *)kmap_atomic(sg_page(sg
));
445 ret
= TCM_OUT_OF_RESOURCES
;
449 len
= min(sg
->length
, compare_len
);
451 if (memcmp(addr
, buf
+ offset
, len
)) {
452 pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
466 len
= cmd
->t_task_nolb
* block_size
;
467 sg_miter_start(&m
, cmd
->t_data_sg
, cmd
->t_data_nents
, SG_MITER_TO_SG
);
469 * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
474 if (block_size
< PAGE_SIZE
) {
475 sg_set_page(&write_sg
[i
], m
.page
, block_size
,
479 sg_set_page(&write_sg
[i
], m
.page
, block_size
,
487 * Save the original SGL + nents values before updating to new
488 * assignments, to be released in transport_free_pages() ->
489 * transport_reset_sgl_orig()
491 cmd
->t_data_sg_orig
= cmd
->t_data_sg
;
492 cmd
->t_data_sg
= write_sg
;
493 cmd
->t_data_nents_orig
= cmd
->t_data_nents
;
494 cmd
->t_data_nents
= 1;
496 cmd
->sam_task_attr
= MSG_HEAD_TAG
;
497 cmd
->transport_complete_callback
= compare_and_write_post
;
499 * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
500 * for submitting the adjusted SGL to write instance user-data.
502 cmd
->execute_cmd
= sbc_execute_rw
;
504 spin_lock_irq(&cmd
->t_state_lock
);
505 cmd
->t_state
= TRANSPORT_PROCESSING
;
506 cmd
->transport_state
|= CMD_T_ACTIVE
|CMD_T_BUSY
|CMD_T_SENT
;
507 spin_unlock_irq(&cmd
->t_state_lock
);
509 __target_execute_cmd(cmd
);
515 pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
516 dev
->transport
->name
);
517 ret
= TCM_MISCOMPARE_VERIFY
;
520 * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
521 * sbc_compare_and_write() before the original READ I/O submission.
529 static sense_reason_t
530 sbc_compare_and_write(struct se_cmd
*cmd
)
532 struct se_device
*dev
= cmd
->se_dev
;
536 * Submit the READ first for COMPARE_AND_WRITE to perform the
537 * comparision using SGLs at cmd->t_bidi_data_sg..
539 rc
= down_interruptible(&dev
->caw_sem
);
540 if ((rc
!= 0) || signal_pending(current
)) {
541 cmd
->transport_complete_callback
= NULL
;
542 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
545 * Reset cmd->data_length to individual block_size in order to not
546 * confuse backend drivers that depend on this value matching the
547 * size of the I/O being submitted.
549 cmd
->data_length
= cmd
->t_task_nolb
* dev
->dev_attrib
.block_size
;
551 ret
= cmd
->execute_rw(cmd
, cmd
->t_bidi_data_sg
, cmd
->t_bidi_data_nents
,
554 cmd
->transport_complete_callback
= NULL
;
559 * Unlock of dev->caw_sem to occur in compare_and_write_callback()
560 * upon MISCOMPARE, or in compare_and_write_done() upon completion
561 * of WRITE instance user-data.
567 sbc_parse_cdb(struct se_cmd
*cmd
, struct sbc_ops
*ops
)
569 struct se_device
*dev
= cmd
->se_dev
;
570 unsigned char *cdb
= cmd
->t_task_cdb
;
577 sectors
= transport_get_sectors_6(cdb
);
578 cmd
->t_task_lba
= transport_lba_21(cdb
);
579 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
580 cmd
->execute_rw
= ops
->execute_rw
;
581 cmd
->execute_cmd
= sbc_execute_rw
;
584 sectors
= transport_get_sectors_10(cdb
);
585 cmd
->t_task_lba
= transport_lba_32(cdb
);
586 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
587 cmd
->execute_rw
= ops
->execute_rw
;
588 cmd
->execute_cmd
= sbc_execute_rw
;
591 sectors
= transport_get_sectors_12(cdb
);
592 cmd
->t_task_lba
= transport_lba_32(cdb
);
593 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
594 cmd
->execute_rw
= ops
->execute_rw
;
595 cmd
->execute_cmd
= sbc_execute_rw
;
598 sectors
= transport_get_sectors_16(cdb
);
599 cmd
->t_task_lba
= transport_lba_64(cdb
);
600 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
601 cmd
->execute_rw
= ops
->execute_rw
;
602 cmd
->execute_cmd
= sbc_execute_rw
;
605 sectors
= transport_get_sectors_6(cdb
);
606 cmd
->t_task_lba
= transport_lba_21(cdb
);
607 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
608 cmd
->execute_rw
= ops
->execute_rw
;
609 cmd
->execute_cmd
= sbc_execute_rw
;
613 sectors
= transport_get_sectors_10(cdb
);
614 cmd
->t_task_lba
= transport_lba_32(cdb
);
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
;
622 sectors
= transport_get_sectors_12(cdb
);
623 cmd
->t_task_lba
= transport_lba_32(cdb
);
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
;
631 sectors
= transport_get_sectors_16(cdb
);
632 cmd
->t_task_lba
= transport_lba_64(cdb
);
634 cmd
->se_cmd_flags
|= SCF_FUA
;
635 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
636 cmd
->execute_rw
= ops
->execute_rw
;
637 cmd
->execute_cmd
= sbc_execute_rw
;
640 if (cmd
->data_direction
!= DMA_TO_DEVICE
||
641 !(cmd
->se_cmd_flags
& SCF_BIDI
))
642 return TCM_INVALID_CDB_FIELD
;
643 sectors
= transport_get_sectors_10(cdb
);
645 cmd
->t_task_lba
= transport_lba_32(cdb
);
646 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
649 * Setup BIDI XOR callback to be run after I/O completion.
651 cmd
->execute_rw
= ops
->execute_rw
;
652 cmd
->execute_cmd
= sbc_execute_rw
;
653 cmd
->transport_complete_callback
= &xdreadwrite_callback
;
655 cmd
->se_cmd_flags
|= SCF_FUA
;
657 case VARIABLE_LENGTH_CMD
:
659 u16 service_action
= get_unaligned_be16(&cdb
[8]);
660 switch (service_action
) {
662 sectors
= transport_get_sectors_32(cdb
);
665 * Use WRITE_32 and READ_32 opcodes for the emulated
666 * XDWRITE_READ_32 logic.
668 cmd
->t_task_lba
= transport_lba_64_ext(cdb
);
669 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
;
672 * Setup BIDI XOR callback to be run during after I/O
675 cmd
->execute_rw
= ops
->execute_rw
;
676 cmd
->execute_cmd
= sbc_execute_rw
;
677 cmd
->transport_complete_callback
= &xdreadwrite_callback
;
679 cmd
->se_cmd_flags
|= SCF_FUA
;
682 sectors
= transport_get_sectors_32(cdb
);
684 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
686 return TCM_INVALID_CDB_FIELD
;
689 size
= sbc_get_size(cmd
, 1);
690 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[12]);
692 ret
= sbc_setup_write_same(cmd
, &cdb
[10], ops
);
697 pr_err("VARIABLE_LENGTH_CMD service action"
698 " 0x%04x not supported\n", service_action
);
699 return TCM_UNSUPPORTED_SCSI_OPCODE
;
703 case COMPARE_AND_WRITE
:
706 * Currently enforce COMPARE_AND_WRITE for a single sector
709 pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
710 " than 1\n", sectors
);
711 return TCM_INVALID_CDB_FIELD
;
714 * Double size because we have two buffers, note that
715 * zero is not an error..
717 size
= 2 * sbc_get_size(cmd
, sectors
);
718 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
719 cmd
->t_task_nolb
= sectors
;
720 cmd
->se_cmd_flags
|= SCF_SCSI_DATA_CDB
| SCF_COMPARE_AND_WRITE
;
721 cmd
->execute_rw
= ops
->execute_rw
;
722 cmd
->execute_cmd
= sbc_compare_and_write
;
723 cmd
->transport_complete_callback
= compare_and_write_callback
;
727 cmd
->execute_cmd
= sbc_emulate_readcapacity
;
729 case SERVICE_ACTION_IN
:
730 switch (cmd
->t_task_cdb
[1] & 0x1f) {
731 case SAI_READ_CAPACITY_16
:
732 cmd
->execute_cmd
= sbc_emulate_readcapacity_16
;
735 pr_err("Unsupported SA: 0x%02x\n",
736 cmd
->t_task_cdb
[1] & 0x1f);
737 return TCM_INVALID_CDB_FIELD
;
739 size
= (cdb
[10] << 24) | (cdb
[11] << 16) |
740 (cdb
[12] << 8) | cdb
[13];
742 case SYNCHRONIZE_CACHE
:
743 case SYNCHRONIZE_CACHE_16
:
744 if (!ops
->execute_sync_cache
) {
746 cmd
->execute_cmd
= sbc_emulate_noop
;
751 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
753 if (cdb
[0] == SYNCHRONIZE_CACHE
) {
754 sectors
= transport_get_sectors_10(cdb
);
755 cmd
->t_task_lba
= transport_lba_32(cdb
);
757 sectors
= transport_get_sectors_16(cdb
);
758 cmd
->t_task_lba
= transport_lba_64(cdb
);
761 size
= sbc_get_size(cmd
, sectors
);
764 * Check to ensure that LBA + Range does not exceed past end of
765 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
767 if (cmd
->t_task_lba
|| sectors
) {
768 if (sbc_check_valid_sectors(cmd
) < 0)
769 return TCM_ADDRESS_OUT_OF_RANGE
;
771 cmd
->execute_cmd
= ops
->execute_sync_cache
;
774 if (!ops
->execute_unmap
)
775 return TCM_UNSUPPORTED_SCSI_OPCODE
;
777 size
= get_unaligned_be16(&cdb
[7]);
778 cmd
->execute_cmd
= ops
->execute_unmap
;
781 sectors
= transport_get_sectors_16(cdb
);
783 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
784 return TCM_INVALID_CDB_FIELD
;
787 size
= sbc_get_size(cmd
, 1);
788 cmd
->t_task_lba
= get_unaligned_be64(&cdb
[2]);
790 ret
= sbc_setup_write_same(cmd
, &cdb
[1], ops
);
795 sectors
= transport_get_sectors_10(cdb
);
797 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
798 return TCM_INVALID_CDB_FIELD
;
801 size
= sbc_get_size(cmd
, 1);
802 cmd
->t_task_lba
= get_unaligned_be32(&cdb
[2]);
805 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
806 * of byte 1 bit 3 UNMAP instead of original reserved field
808 ret
= sbc_setup_write_same(cmd
, &cdb
[1], ops
);
814 cmd
->execute_cmd
= sbc_emulate_noop
;
820 * There are still clients out there which use these old SCSI-2
821 * commands. This mainly happens when running VMs with legacy
822 * guest systems, connected via SCSI command pass-through to
823 * iSCSI targets. Make them happy and return status GOOD.
826 cmd
->execute_cmd
= sbc_emulate_noop
;
829 ret
= spc_parse_cdb(cmd
, &size
);
834 /* reject any command that we don't have a handler for */
835 if (!(cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) && !cmd
->execute_cmd
)
836 return TCM_UNSUPPORTED_SCSI_OPCODE
;
838 if (cmd
->se_cmd_flags
& SCF_SCSI_DATA_CDB
) {
839 unsigned long long end_lba
;
841 if (sectors
> dev
->dev_attrib
.fabric_max_sectors
) {
842 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
843 " big sectors %u exceeds fabric_max_sectors:"
844 " %u\n", cdb
[0], sectors
,
845 dev
->dev_attrib
.fabric_max_sectors
);
846 return TCM_INVALID_CDB_FIELD
;
848 if (sectors
> dev
->dev_attrib
.hw_max_sectors
) {
849 printk_ratelimited(KERN_ERR
"SCSI OP %02xh with too"
850 " big sectors %u exceeds backend hw_max_sectors:"
851 " %u\n", cdb
[0], sectors
,
852 dev
->dev_attrib
.hw_max_sectors
);
853 return TCM_INVALID_CDB_FIELD
;
856 end_lba
= dev
->transport
->get_blocks(dev
) + 1;
857 if (cmd
->t_task_lba
+ sectors
> end_lba
) {
858 pr_err("cmd exceeds last lba %llu "
859 "(lba %llu, sectors %u)\n",
860 end_lba
, cmd
->t_task_lba
, sectors
);
861 return TCM_ADDRESS_OUT_OF_RANGE
;
864 if (!(cmd
->se_cmd_flags
& SCF_COMPARE_AND_WRITE
))
865 size
= sbc_get_size(cmd
, sectors
);
868 return target_cmd_size_check(cmd
, size
);
870 EXPORT_SYMBOL(sbc_parse_cdb
);
872 u32
sbc_get_device_type(struct se_device
*dev
)
876 EXPORT_SYMBOL(sbc_get_device_type
);
879 sbc_execute_unmap(struct se_cmd
*cmd
,
880 sense_reason_t (*do_unmap_fn
)(struct se_cmd
*, void *,
884 struct se_device
*dev
= cmd
->se_dev
;
885 unsigned char *buf
, *ptr
= NULL
;
889 sense_reason_t ret
= 0;
892 /* We never set ANC_SUP */
893 if (cmd
->t_task_cdb
[1])
894 return TCM_INVALID_CDB_FIELD
;
896 if (cmd
->data_length
== 0) {
897 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
901 if (cmd
->data_length
< 8) {
902 pr_warn("UNMAP parameter list length %u too small\n",
904 return TCM_PARAMETER_LIST_LENGTH_ERROR
;
907 buf
= transport_kmap_data_sg(cmd
);
909 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
911 dl
= get_unaligned_be16(&buf
[0]);
912 bd_dl
= get_unaligned_be16(&buf
[2]);
914 size
= cmd
->data_length
- 8;
916 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
917 cmd
->data_length
, bd_dl
);
921 if (size
/ 16 > dev
->dev_attrib
.max_unmap_block_desc_count
) {
922 ret
= TCM_INVALID_PARAMETER_LIST
;
926 /* First UNMAP block descriptor starts at 8 byte offset */
928 pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
929 " ptr: %p\n", dev
->transport
->name
, dl
, bd_dl
, size
, ptr
);
932 lba
= get_unaligned_be64(&ptr
[0]);
933 range
= get_unaligned_be32(&ptr
[8]);
934 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
935 (unsigned long long)lba
, range
);
937 if (range
> dev
->dev_attrib
.max_unmap_lba_count
) {
938 ret
= TCM_INVALID_PARAMETER_LIST
;
942 if (lba
+ range
> dev
->transport
->get_blocks(dev
) + 1) {
943 ret
= TCM_ADDRESS_OUT_OF_RANGE
;
947 ret
= do_unmap_fn(cmd
, priv
, lba
, range
);
956 transport_kunmap_data_sg(cmd
);
958 target_complete_cmd(cmd
, GOOD
);
961 EXPORT_SYMBOL(sbc_execute_unmap
);