Commit | Line | Data |
---|---|---|
d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
d6e0175c CH |
5 | * |
6 | * Nicholas A. Bellinger <nab@kernel.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/ratelimit.h> | |
41861fa8 | 26 | #include <linux/crc-t10dif.h> |
d6e0175c CH |
27 | #include <asm/unaligned.h> |
28 | #include <scsi/scsi.h> | |
68ff9b9b | 29 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
30 | |
31 | #include <target/target_core_base.h> | |
32 | #include <target/target_core_backend.h> | |
33 | #include <target/target_core_fabric.h> | |
34 | ||
35 | #include "target_core_internal.h" | |
36 | #include "target_core_ua.h" | |
c66094bf | 37 | #include "target_core_alua.h" |
d6e0175c | 38 | |
afd73f1b NB |
39 | static sense_reason_t |
40 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); | |
41 | ||
de103c93 CH |
42 | static sense_reason_t |
43 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
44 | { |
45 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 46 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 47 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
48 | unsigned char *rbuf; |
49 | unsigned char buf[8]; | |
1fd032ee CH |
50 | u32 blocks; |
51 | ||
8dc8632a RD |
52 | /* |
53 | * SBC-2 says: | |
54 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
55 | * ADDRESS field is not set to zero, the device server shall | |
56 | * terminate the command with CHECK CONDITION status with | |
57 | * the sense key set to ILLEGAL REQUEST and the additional | |
58 | * sense code set to INVALID FIELD IN CDB. | |
59 | * | |
60 | * In SBC-3, these fields are obsolete, but some SCSI | |
61 | * compliance tests actually check this, so we might as well | |
62 | * follow SBC-2. | |
63 | */ | |
64 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
65 | return TCM_INVALID_CDB_FIELD; | |
66 | ||
1fd032ee CH |
67 | if (blocks_long >= 0x00000000ffffffff) |
68 | blocks = 0xffffffff; | |
69 | else | |
70 | blocks = (u32)blocks_long; | |
71 | ||
1fd032ee CH |
72 | buf[0] = (blocks >> 24) & 0xff; |
73 | buf[1] = (blocks >> 16) & 0xff; | |
74 | buf[2] = (blocks >> 8) & 0xff; | |
75 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
76 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
77 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
78 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
79 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 80 | |
a50da144 | 81 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
82 | if (rbuf) { |
83 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
84 | transport_kunmap_data_sg(cmd); | |
85 | } | |
1fd032ee | 86 | |
2426bd45 | 87 | target_complete_cmd_with_length(cmd, GOOD, 8); |
1fd032ee CH |
88 | return 0; |
89 | } | |
90 | ||
de103c93 CH |
91 | static sense_reason_t |
92 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
93 | { |
94 | struct se_device *dev = cmd->se_dev; | |
2d335983 | 95 | struct se_session *sess = cmd->se_sess; |
9ef5466e NB |
96 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
97 | ||
a50da144 PB |
98 | unsigned char *rbuf; |
99 | unsigned char buf[32]; | |
1fd032ee CH |
100 | unsigned long long blocks = dev->transport->get_blocks(dev); |
101 | ||
a50da144 | 102 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
103 | buf[0] = (blocks >> 56) & 0xff; |
104 | buf[1] = (blocks >> 48) & 0xff; | |
105 | buf[2] = (blocks >> 40) & 0xff; | |
106 | buf[3] = (blocks >> 32) & 0xff; | |
107 | buf[4] = (blocks >> 24) & 0xff; | |
108 | buf[5] = (blocks >> 16) & 0xff; | |
109 | buf[6] = (blocks >> 8) & 0xff; | |
110 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
111 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
112 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
113 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
114 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
56dac14c NB |
115 | /* |
116 | * Set P_TYPE and PROT_EN bits for DIF support | |
117 | */ | |
2d335983 | 118 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
9ef5466e NB |
119 | /* |
120 | * Only override a device's pi_prot_type if no T10-PI is | |
121 | * available, and sess_prot_type has been explicitly enabled. | |
122 | */ | |
123 | if (!pi_prot_type) | |
124 | pi_prot_type = sess->sess_prot_type; | |
125 | ||
126 | if (pi_prot_type) | |
127 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; | |
2d335983 | 128 | } |
7f7caf6a AG |
129 | |
130 | if (dev->transport->get_lbppbe) | |
131 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
132 | ||
133 | if (dev->transport->get_alignment_offset_lbas) { | |
134 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
135 | buf[14] = (lalba >> 8) & 0x3f; | |
136 | buf[15] = lalba & 0xff; | |
137 | } | |
138 | ||
1fd032ee CH |
139 | /* |
140 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
141 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
142 | */ | |
0fd97ccf | 143 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 144 | buf[14] |= 0x80; |
1fd032ee | 145 | |
a50da144 | 146 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
147 | if (rbuf) { |
148 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
149 | transport_kunmap_data_sg(cmd); | |
150 | } | |
1fd032ee | 151 | |
2426bd45 | 152 | target_complete_cmd_with_length(cmd, GOOD, 32); |
1fd032ee CH |
153 | return 0; |
154 | } | |
155 | ||
972b29c8 | 156 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 157 | { |
1fd032ee | 158 | u32 num_blocks; |
1fd032ee CH |
159 | |
160 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
161 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
162 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
163 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
164 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
165 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
166 | ||
167 | /* | |
168 | * Use the explicit range when non zero is supplied, otherwise calculate | |
169 | * the remaining range based on ->get_blocks() - starting LBA. | |
170 | */ | |
6f974e8c CH |
171 | if (num_blocks) |
172 | return num_blocks; | |
1fd032ee | 173 | |
6f974e8c CH |
174 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
175 | cmd->t_task_lba + 1; | |
1fd032ee | 176 | } |
972b29c8 | 177 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 178 | |
de103c93 | 179 | static sense_reason_t |
1920ed61 | 180 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
181 | { |
182 | target_complete_cmd(cmd, GOOD); | |
183 | return 0; | |
184 | } | |
185 | ||
d6e0175c CH |
186 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
187 | { | |
0fd97ccf | 188 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
189 | } |
190 | ||
d6e0175c CH |
191 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
192 | { | |
193 | /* | |
194 | * Use 8-bit sector value. SBC-3 says: | |
195 | * | |
196 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
197 | * logical blocks shall be written. Any other value | |
198 | * specifies the number of logical blocks that shall be | |
199 | * written. | |
200 | */ | |
201 | return cdb[4] ? : 256; | |
202 | } | |
203 | ||
204 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
205 | { | |
206 | return (u32)(cdb[7] << 8) + cdb[8]; | |
207 | } | |
208 | ||
209 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
210 | { | |
211 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
212 | } | |
213 | ||
214 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
215 | { | |
216 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
217 | (cdb[12] << 8) + cdb[13]; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
222 | */ | |
223 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
224 | { | |
225 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
226 | (cdb[30] << 8) + cdb[31]; | |
227 | ||
228 | } | |
229 | ||
230 | static inline u32 transport_lba_21(unsigned char *cdb) | |
231 | { | |
232 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
233 | } | |
234 | ||
235 | static inline u32 transport_lba_32(unsigned char *cdb) | |
236 | { | |
237 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
238 | } | |
239 | ||
240 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
241 | { | |
242 | unsigned int __v1, __v2; | |
243 | ||
244 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
245 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
246 | ||
247 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
248 | } | |
249 | ||
250 | /* | |
251 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
252 | */ | |
253 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
254 | { | |
255 | unsigned int __v1, __v2; | |
256 | ||
257 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
258 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
259 | ||
260 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
261 | } | |
262 | ||
cd063bef NB |
263 | static sense_reason_t |
264 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 265 | { |
8e575c50 NB |
266 | struct se_device *dev = cmd->se_dev; |
267 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; | |
972b29c8 | 268 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
afd73f1b | 269 | sense_reason_t ret; |
773cbaf7 | 270 | |
d6e0175c CH |
271 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
272 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
273 | " bits not supported for Block Discard" | |
274 | " Emulation\n"); | |
cd063bef | 275 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 276 | } |
773cbaf7 NB |
277 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
278 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
279 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
280 | return TCM_INVALID_CDB_FIELD; | |
281 | } | |
8e575c50 NB |
282 | /* |
283 | * Sanity check for LBA wrap and request past end of device. | |
284 | */ | |
285 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || | |
286 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
287 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", | |
288 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); | |
289 | return TCM_ADDRESS_OUT_OF_RANGE; | |
290 | } | |
291 | ||
5cb770bf RD |
292 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
293 | if (flags[0] & 0x10) { | |
294 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
295 | return TCM_INVALID_CDB_FIELD; | |
296 | } | |
d6e0175c | 297 | /* |
cd063bef NB |
298 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
299 | * translated into block discard requests within backend code. | |
d6e0175c | 300 | */ |
cd063bef NB |
301 | if (flags[0] & 0x08) { |
302 | if (!ops->execute_write_same_unmap) | |
303 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
304 | ||
d0a91295 NB |
305 | if (!dev->dev_attrib.emulate_tpws) { |
306 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" | |
307 | " has emulate_tpws disabled\n"); | |
308 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
309 | } | |
cd063bef NB |
310 | cmd->execute_cmd = ops->execute_write_same_unmap; |
311 | return 0; | |
d6e0175c | 312 | } |
cd063bef NB |
313 | if (!ops->execute_write_same) |
314 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 315 | |
afd73f1b NB |
316 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
317 | if (ret) | |
318 | return ret; | |
319 | ||
cd063bef | 320 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
321 | return 0; |
322 | } | |
323 | ||
c8e63985 | 324 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) |
d6e0175c CH |
325 | { |
326 | unsigned char *buf, *addr; | |
327 | struct scatterlist *sg; | |
328 | unsigned int offset; | |
a6b0133c NB |
329 | sense_reason_t ret = TCM_NO_SENSE; |
330 | int i, count; | |
d6e0175c CH |
331 | /* |
332 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
333 | * | |
334 | * 1) read the specified logical block(s); | |
335 | * 2) transfer logical blocks from the data-out buffer; | |
336 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
337 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
338 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
339 | * blocks transferred from the data-out buffer; and | |
340 | * 5) transfer the resulting XOR data to the data-in buffer. | |
341 | */ | |
342 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
343 | if (!buf) { | |
344 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 345 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
346 | } |
347 | /* | |
348 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
349 | * into the locally allocated *buf | |
350 | */ | |
351 | sg_copy_to_buffer(cmd->t_data_sg, | |
352 | cmd->t_data_nents, | |
353 | buf, | |
354 | cmd->data_length); | |
355 | ||
356 | /* | |
357 | * Now perform the XOR against the BIDI read memory located at | |
358 | * cmd->t_mem_bidi_list | |
359 | */ | |
360 | ||
361 | offset = 0; | |
362 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
363 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
364 | if (!addr) { |
365 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 366 | goto out; |
a6b0133c | 367 | } |
d6e0175c CH |
368 | |
369 | for (i = 0; i < sg->length; i++) | |
370 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
371 | ||
372 | offset += sg->length; | |
373 | kunmap_atomic(addr); | |
374 | } | |
375 | ||
376 | out: | |
377 | kfree(buf); | |
a6b0133c | 378 | return ret; |
d6e0175c CH |
379 | } |
380 | ||
a82a9538 NB |
381 | static sense_reason_t |
382 | sbc_execute_rw(struct se_cmd *cmd) | |
383 | { | |
7a971b1b CH |
384 | struct sbc_ops *ops = cmd->protocol_data; |
385 | ||
386 | return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
a82a9538 NB |
387 | cmd->data_direction); |
388 | } | |
389 | ||
c8e63985 | 390 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) |
68ff9b9b NB |
391 | { |
392 | struct se_device *dev = cmd->se_dev; | |
393 | ||
d8855c15 NB |
394 | /* |
395 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
396 | * within target_complete_ok_work() if the command was successfully | |
397 | * sent to the backend driver. | |
398 | */ | |
399 | spin_lock_irq(&cmd->t_state_lock); | |
400 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
401 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
402 | spin_unlock_irq(&cmd->t_state_lock); | |
403 | ||
68ff9b9b NB |
404 | /* |
405 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
406 | * before the original READ I/O submission. | |
407 | */ | |
408 | up(&dev->caw_sem); | |
409 | ||
410 | return TCM_NO_SENSE; | |
411 | } | |
412 | ||
c8e63985 | 413 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) |
68ff9b9b NB |
414 | { |
415 | struct se_device *dev = cmd->se_dev; | |
416 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 417 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
418 | struct sg_mapping_iter m; |
419 | unsigned int offset = 0, len; | |
420 | unsigned int nlbas = cmd->t_task_nolb; | |
421 | unsigned int block_size = dev->dev_attrib.block_size; | |
422 | unsigned int compare_len = (nlbas * block_size); | |
423 | sense_reason_t ret = TCM_NO_SENSE; | |
424 | int rc, i; | |
425 | ||
cf6d1f09 NB |
426 | /* |
427 | * Handle early failure in transport_generic_request_failure(), | |
c8e63985 | 428 | * which will not have taken ->caw_sem yet.. |
cf6d1f09 | 429 | */ |
c8e63985 | 430 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
cf6d1f09 | 431 | return TCM_NO_SENSE; |
c8e63985 NB |
432 | /* |
433 | * Handle special case for zero-length COMPARE_AND_WRITE | |
434 | */ | |
435 | if (!cmd->data_length) | |
436 | goto out; | |
db60df88 NB |
437 | /* |
438 | * Immediately exit + release dev->caw_sem if command has already | |
439 | * been failed with a non-zero SCSI status. | |
440 | */ | |
441 | if (cmd->scsi_status) { | |
442 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
443 | " 0x%02x\n", cmd->scsi_status); | |
444 | goto out; | |
445 | } | |
cf6d1f09 | 446 | |
68ff9b9b NB |
447 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
448 | if (!buf) { | |
449 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
450 | ret = TCM_OUT_OF_RESOURCES; |
451 | goto out; | |
68ff9b9b NB |
452 | } |
453 | ||
a1e1774c | 454 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
68ff9b9b NB |
455 | GFP_KERNEL); |
456 | if (!write_sg) { | |
457 | pr_err("Unable to allocate compare_and_write sg\n"); | |
458 | ret = TCM_OUT_OF_RESOURCES; | |
459 | goto out; | |
460 | } | |
a1e1774c | 461 | sg_init_table(write_sg, cmd->t_data_nents); |
68ff9b9b NB |
462 | /* |
463 | * Setup verify and write data payloads from total NumberLBAs. | |
464 | */ | |
465 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
466 | cmd->data_length); | |
467 | if (!rc) { | |
468 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
469 | ret = TCM_OUT_OF_RESOURCES; | |
470 | goto out; | |
471 | } | |
472 | /* | |
473 | * Compare against SCSI READ payload against verify payload | |
474 | */ | |
475 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
476 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
477 | if (!addr) { | |
478 | ret = TCM_OUT_OF_RESOURCES; | |
479 | goto out; | |
480 | } | |
481 | ||
482 | len = min(sg->length, compare_len); | |
483 | ||
484 | if (memcmp(addr, buf + offset, len)) { | |
485 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
486 | addr, buf + offset); | |
487 | kunmap_atomic(addr); | |
488 | goto miscompare; | |
489 | } | |
490 | kunmap_atomic(addr); | |
491 | ||
492 | offset += len; | |
493 | compare_len -= len; | |
494 | if (!compare_len) | |
495 | break; | |
496 | } | |
497 | ||
498 | i = 0; | |
499 | len = cmd->t_task_nolb * block_size; | |
500 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
501 | /* | |
502 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
503 | */ | |
504 | while (len) { | |
505 | sg_miter_next(&m); | |
506 | ||
507 | if (block_size < PAGE_SIZE) { | |
508 | sg_set_page(&write_sg[i], m.page, block_size, | |
509 | block_size); | |
510 | } else { | |
511 | sg_miter_next(&m); | |
512 | sg_set_page(&write_sg[i], m.page, block_size, | |
513 | 0); | |
514 | } | |
515 | len -= block_size; | |
516 | i++; | |
517 | } | |
518 | sg_miter_stop(&m); | |
519 | /* | |
520 | * Save the original SGL + nents values before updating to new | |
521 | * assignments, to be released in transport_free_pages() -> | |
522 | * transport_reset_sgl_orig() | |
523 | */ | |
524 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
525 | cmd->t_data_sg = write_sg; | |
526 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
527 | cmd->t_data_nents = 1; | |
528 | ||
68d81f40 | 529 | cmd->sam_task_attr = TCM_HEAD_TAG; |
68ff9b9b NB |
530 | cmd->transport_complete_callback = compare_and_write_post; |
531 | /* | |
532 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
533 | * for submitting the adjusted SGL to write instance user-data. | |
534 | */ | |
535 | cmd->execute_cmd = sbc_execute_rw; | |
536 | ||
537 | spin_lock_irq(&cmd->t_state_lock); | |
538 | cmd->t_state = TRANSPORT_PROCESSING; | |
539 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
540 | spin_unlock_irq(&cmd->t_state_lock); | |
541 | ||
542 | __target_execute_cmd(cmd); | |
543 | ||
544 | kfree(buf); | |
545 | return ret; | |
546 | ||
547 | miscompare: | |
548 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
549 | dev->transport->name); | |
550 | ret = TCM_MISCOMPARE_VERIFY; | |
551 | out: | |
552 | /* | |
553 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
554 | * sbc_compare_and_write() before the original READ I/O submission. | |
555 | */ | |
556 | up(&dev->caw_sem); | |
557 | kfree(write_sg); | |
558 | kfree(buf); | |
559 | return ret; | |
560 | } | |
561 | ||
562 | static sense_reason_t | |
563 | sbc_compare_and_write(struct se_cmd *cmd) | |
564 | { | |
7a971b1b | 565 | struct sbc_ops *ops = cmd->protocol_data; |
68ff9b9b NB |
566 | struct se_device *dev = cmd->se_dev; |
567 | sense_reason_t ret; | |
568 | int rc; | |
569 | /* | |
570 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
571 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
572 | */ | |
573 | rc = down_interruptible(&dev->caw_sem); | |
ee7619f2 | 574 | if (rc != 0) { |
68ff9b9b NB |
575 | cmd->transport_complete_callback = NULL; |
576 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
577 | } | |
b7191253 NB |
578 | /* |
579 | * Reset cmd->data_length to individual block_size in order to not | |
580 | * confuse backend drivers that depend on this value matching the | |
581 | * size of the I/O being submitted. | |
582 | */ | |
583 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b | 584 | |
7a971b1b | 585 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
68ff9b9b NB |
586 | DMA_FROM_DEVICE); |
587 | if (ret) { | |
588 | cmd->transport_complete_callback = NULL; | |
589 | up(&dev->caw_sem); | |
590 | return ret; | |
591 | } | |
592 | /* | |
593 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
594 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
595 | * of WRITE instance user-data. | |
596 | */ | |
597 | return TCM_NO_SENSE; | |
598 | } | |
599 | ||
19f9361a | 600 | static int |
38b57f82 | 601 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
19f9361a SG |
602 | bool is_write, struct se_cmd *cmd) |
603 | { | |
604 | if (is_write) { | |
38b57f82 NB |
605 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
606 | protect ? TARGET_PROT_DOUT_PASS : | |
607 | TARGET_PROT_DOUT_INSERT; | |
19f9361a SG |
608 | switch (protect) { |
609 | case 0x0: | |
610 | case 0x3: | |
611 | cmd->prot_checks = 0; | |
612 | break; | |
613 | case 0x1: | |
614 | case 0x5: | |
615 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
616 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
617 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
618 | break; | |
619 | case 0x2: | |
620 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
621 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
622 | break; | |
623 | case 0x4: | |
624 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
625 | break; | |
626 | default: | |
627 | pr_err("Unsupported protect field %d\n", protect); | |
628 | return -EINVAL; | |
629 | } | |
630 | } else { | |
38b57f82 NB |
631 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
632 | protect ? TARGET_PROT_DIN_PASS : | |
633 | TARGET_PROT_DIN_STRIP; | |
19f9361a SG |
634 | switch (protect) { |
635 | case 0x0: | |
636 | case 0x1: | |
637 | case 0x5: | |
638 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
639 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
640 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; | |
641 | break; | |
642 | case 0x2: | |
643 | if (prot_type == TARGET_DIF_TYPE1_PROT) | |
644 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; | |
645 | break; | |
646 | case 0x3: | |
647 | cmd->prot_checks = 0; | |
648 | break; | |
649 | case 0x4: | |
650 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; | |
651 | break; | |
652 | default: | |
653 | pr_err("Unsupported protect field %d\n", protect); | |
654 | return -EINVAL; | |
655 | } | |
656 | } | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
f7b7c06f | 661 | static sense_reason_t |
499bf77b | 662 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
19f9361a | 663 | u32 sectors, bool is_write) |
499bf77b | 664 | { |
19f9361a | 665 | u8 protect = cdb[1] >> 5; |
38b57f82 NB |
666 | int sp_ops = cmd->se_sess->sup_prot_ops; |
667 | int pi_prot_type = dev->dev_attrib.pi_prot_type; | |
668 | bool fabric_prot = false; | |
19f9361a | 669 | |
f7b7c06f | 670 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
38b57f82 NB |
671 | if (unlikely(protect && |
672 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { | |
673 | pr_err("CDB contains protect bit, but device + fabric does" | |
674 | " not advertise PROTECT=1 feature bit\n"); | |
f7b7c06f NB |
675 | return TCM_INVALID_CDB_FIELD; |
676 | } | |
677 | if (cmd->prot_pto) | |
678 | return TCM_NO_SENSE; | |
679 | } | |
499bf77b NB |
680 | |
681 | switch (dev->dev_attrib.pi_prot_type) { | |
682 | case TARGET_DIF_TYPE3_PROT: | |
499bf77b NB |
683 | cmd->reftag_seed = 0xffffffff; |
684 | break; | |
685 | case TARGET_DIF_TYPE2_PROT: | |
19f9361a | 686 | if (protect) |
f7b7c06f | 687 | return TCM_INVALID_CDB_FIELD; |
499bf77b NB |
688 | |
689 | cmd->reftag_seed = cmd->t_task_lba; | |
690 | break; | |
691 | case TARGET_DIF_TYPE1_PROT: | |
499bf77b NB |
692 | cmd->reftag_seed = cmd->t_task_lba; |
693 | break; | |
694 | case TARGET_DIF_TYPE0_PROT: | |
38b57f82 NB |
695 | /* |
696 | * See if the fabric supports T10-PI, and the session has been | |
697 | * configured to allow export PROTECT=1 feature bit with backend | |
698 | * devices that don't support T10-PI. | |
699 | */ | |
700 | fabric_prot = is_write ? | |
701 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : | |
702 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); | |
703 | ||
704 | if (fabric_prot && cmd->se_sess->sess_prot_type) { | |
705 | pi_prot_type = cmd->se_sess->sess_prot_type; | |
706 | break; | |
707 | } | |
cceca4a6 NB |
708 | if (!protect) |
709 | return TCM_NO_SENSE; | |
38b57f82 | 710 | /* Fallthrough */ |
499bf77b | 711 | default: |
cceca4a6 NB |
712 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
713 | "PROTECT: 0x%02x\n", cdb[0], protect); | |
714 | return TCM_INVALID_CDB_FIELD; | |
499bf77b NB |
715 | } |
716 | ||
38b57f82 | 717 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
f7b7c06f | 718 | return TCM_INVALID_CDB_FIELD; |
19f9361a | 719 | |
38b57f82 | 720 | cmd->prot_type = pi_prot_type; |
499bf77b | 721 | cmd->prot_length = dev->prot_length * sectors; |
e2a4f55c SG |
722 | |
723 | /** | |
724 | * In case protection information exists over the wire | |
725 | * we modify command data length to describe pure data. | |
726 | * The actual transfer length is data length + protection | |
727 | * length | |
728 | **/ | |
729 | if (protect) | |
730 | cmd->data_length = sectors * dev->dev_attrib.block_size; | |
731 | ||
732 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " | |
733 | "prot_op=%d prot_checks=%d\n", | |
734 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, | |
03abad9e | 735 | cmd->prot_op, cmd->prot_checks); |
499bf77b | 736 | |
f7b7c06f | 737 | return TCM_NO_SENSE; |
499bf77b NB |
738 | } |
739 | ||
fde9f50f NB |
740 | static int |
741 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) | |
742 | { | |
743 | if (cdb[1] & 0x10) { | |
814e5b45 CH |
744 | /* see explanation in spc_emulate_modesense */ |
745 | if (!target_check_fua(dev)) { | |
fde9f50f NB |
746 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
747 | " does not advertise support for DPO\n", cdb[0]); | |
748 | return -EINVAL; | |
749 | } | |
750 | } | |
751 | if (cdb[1] & 0x8) { | |
814e5b45 | 752 | if (!target_check_fua(dev)) { |
fde9f50f NB |
753 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
754 | " does not advertise support for FUA write\n", | |
755 | cdb[0]); | |
756 | return -EINVAL; | |
757 | } | |
758 | cmd->se_cmd_flags |= SCF_FUA; | |
759 | } | |
760 | return 0; | |
499bf77b NB |
761 | } |
762 | ||
de103c93 CH |
763 | sense_reason_t |
764 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 765 | { |
d6e0175c CH |
766 | struct se_device *dev = cmd->se_dev; |
767 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 768 | unsigned int size; |
d6e0175c | 769 | u32 sectors = 0; |
de103c93 | 770 | sense_reason_t ret; |
d6e0175c | 771 | |
7a971b1b CH |
772 | cmd->protocol_data = ops; |
773 | ||
d6e0175c CH |
774 | switch (cdb[0]) { |
775 | case READ_6: | |
776 | sectors = transport_get_sectors_6(cdb); | |
777 | cmd->t_task_lba = transport_lba_21(cdb); | |
778 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 779 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
780 | break; |
781 | case READ_10: | |
782 | sectors = transport_get_sectors_10(cdb); | |
783 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 784 | |
fde9f50f NB |
785 | if (sbc_check_dpofua(dev, cmd, cdb)) |
786 | return TCM_INVALID_CDB_FIELD; | |
787 | ||
f7b7c06f NB |
788 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
789 | if (ret) | |
790 | return ret; | |
499bf77b | 791 | |
d6e0175c | 792 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 793 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
794 | break; |
795 | case READ_12: | |
796 | sectors = transport_get_sectors_12(cdb); | |
797 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 798 | |
fde9f50f NB |
799 | if (sbc_check_dpofua(dev, cmd, cdb)) |
800 | return TCM_INVALID_CDB_FIELD; | |
801 | ||
f7b7c06f NB |
802 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
803 | if (ret) | |
804 | return ret; | |
499bf77b | 805 | |
d6e0175c | 806 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 807 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
808 | break; |
809 | case READ_16: | |
810 | sectors = transport_get_sectors_16(cdb); | |
811 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 812 | |
fde9f50f NB |
813 | if (sbc_check_dpofua(dev, cmd, cdb)) |
814 | return TCM_INVALID_CDB_FIELD; | |
815 | ||
f7b7c06f NB |
816 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
817 | if (ret) | |
818 | return ret; | |
499bf77b | 819 | |
d6e0175c | 820 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 821 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
822 | break; |
823 | case WRITE_6: | |
824 | sectors = transport_get_sectors_6(cdb); | |
825 | cmd->t_task_lba = transport_lba_21(cdb); | |
826 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 | 827 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
828 | break; |
829 | case WRITE_10: | |
830 | case WRITE_VERIFY: | |
831 | sectors = transport_get_sectors_10(cdb); | |
832 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 833 | |
fde9f50f NB |
834 | if (sbc_check_dpofua(dev, cmd, cdb)) |
835 | return TCM_INVALID_CDB_FIELD; | |
836 | ||
f7b7c06f NB |
837 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
838 | if (ret) | |
839 | return ret; | |
499bf77b | 840 | |
d6e0175c | 841 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 842 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
843 | break; |
844 | case WRITE_12: | |
845 | sectors = transport_get_sectors_12(cdb); | |
846 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b | 847 | |
fde9f50f NB |
848 | if (sbc_check_dpofua(dev, cmd, cdb)) |
849 | return TCM_INVALID_CDB_FIELD; | |
850 | ||
f7b7c06f NB |
851 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
852 | if (ret) | |
853 | return ret; | |
499bf77b | 854 | |
d6e0175c | 855 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 856 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
857 | break; |
858 | case WRITE_16: | |
859 | sectors = transport_get_sectors_16(cdb); | |
860 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b | 861 | |
fde9f50f NB |
862 | if (sbc_check_dpofua(dev, cmd, cdb)) |
863 | return TCM_INVALID_CDB_FIELD; | |
864 | ||
f7b7c06f NB |
865 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
866 | if (ret) | |
867 | return ret; | |
499bf77b | 868 | |
d6e0175c | 869 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 | 870 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c CH |
871 | break; |
872 | case XDWRITEREAD_10: | |
de103c93 | 873 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 874 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 875 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
876 | sectors = transport_get_sectors_10(cdb); |
877 | ||
fde9f50f NB |
878 | if (sbc_check_dpofua(dev, cmd, cdb)) |
879 | return TCM_INVALID_CDB_FIELD; | |
880 | ||
d6e0175c CH |
881 | cmd->t_task_lba = transport_lba_32(cdb); |
882 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
883 | ||
884 | /* | |
885 | * Setup BIDI XOR callback to be run after I/O completion. | |
886 | */ | |
a82a9538 | 887 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 888 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
889 | break; |
890 | case VARIABLE_LENGTH_CMD: | |
891 | { | |
892 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
893 | switch (service_action) { | |
894 | case XDWRITEREAD_32: | |
895 | sectors = transport_get_sectors_32(cdb); | |
896 | ||
fde9f50f NB |
897 | if (sbc_check_dpofua(dev, cmd, cdb)) |
898 | return TCM_INVALID_CDB_FIELD; | |
d6e0175c CH |
899 | /* |
900 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
901 | * XDWRITE_READ_32 logic. | |
902 | */ | |
903 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
904 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
905 | ||
906 | /* | |
907 | * Setup BIDI XOR callback to be run during after I/O | |
908 | * completion. | |
909 | */ | |
a82a9538 | 910 | cmd->execute_cmd = sbc_execute_rw; |
d6e0175c | 911 | cmd->transport_complete_callback = &xdreadwrite_callback; |
d6e0175c CH |
912 | break; |
913 | case WRITE_SAME_32: | |
914 | sectors = transport_get_sectors_32(cdb); | |
915 | if (!sectors) { | |
916 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
917 | " supported\n"); | |
de103c93 | 918 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
919 | } |
920 | ||
1fd032ee | 921 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
922 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
923 | ||
cd063bef | 924 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 925 | if (ret) |
cd063bef | 926 | return ret; |
d6e0175c CH |
927 | break; |
928 | default: | |
929 | pr_err("VARIABLE_LENGTH_CMD service action" | |
930 | " 0x%04x not supported\n", service_action); | |
de103c93 | 931 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
932 | } |
933 | break; | |
934 | } | |
68ff9b9b NB |
935 | case COMPARE_AND_WRITE: |
936 | sectors = cdb[13]; | |
937 | /* | |
938 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
939 | */ | |
940 | if (sectors > 1) { | |
941 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
942 | " than 1\n", sectors); | |
943 | return TCM_INVALID_CDB_FIELD; | |
944 | } | |
945 | /* | |
946 | * Double size because we have two buffers, note that | |
947 | * zero is not an error.. | |
948 | */ | |
949 | size = 2 * sbc_get_size(cmd, sectors); | |
950 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
951 | cmd->t_task_nolb = sectors; | |
952 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
68ff9b9b NB |
953 | cmd->execute_cmd = sbc_compare_and_write; |
954 | cmd->transport_complete_callback = compare_and_write_callback; | |
955 | break; | |
d6e0175c | 956 | case READ_CAPACITY: |
1fd032ee CH |
957 | size = READ_CAP_LEN; |
958 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c | 959 | break; |
eb846d9f | 960 | case SERVICE_ACTION_IN_16: |
d6e0175c CH |
961 | switch (cmd->t_task_cdb[1] & 0x1f) { |
962 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 963 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 964 | break; |
c66094bf HR |
965 | case SAI_REPORT_REFERRALS: |
966 | cmd->execute_cmd = target_emulate_report_referrals; | |
967 | break; | |
d6e0175c CH |
968 | default: |
969 | pr_err("Unsupported SA: 0x%02x\n", | |
970 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 971 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 972 | } |
1fd032ee | 973 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
974 | (cdb[12] << 8) | cdb[13]; |
975 | break; | |
976 | case SYNCHRONIZE_CACHE: | |
977 | case SYNCHRONIZE_CACHE_16: | |
d6e0175c CH |
978 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
979 | sectors = transport_get_sectors_10(cdb); | |
980 | cmd->t_task_lba = transport_lba_32(cdb); | |
981 | } else { | |
982 | sectors = transport_get_sectors_16(cdb); | |
983 | cmd->t_task_lba = transport_lba_64(cdb); | |
984 | } | |
6ef31dc7 CVB |
985 | if (ops->execute_sync_cache) { |
986 | cmd->execute_cmd = ops->execute_sync_cache; | |
987 | goto check_lba; | |
d6e0175c | 988 | } |
6ef31dc7 CVB |
989 | size = 0; |
990 | cmd->execute_cmd = sbc_emulate_noop; | |
d6e0175c CH |
991 | break; |
992 | case UNMAP: | |
14150a6b | 993 | if (!ops->execute_unmap) |
de103c93 | 994 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 995 | |
61fdb4ac NB |
996 | if (!dev->dev_attrib.emulate_tpu) { |
997 | pr_err("Got UNMAP, but backend device has" | |
998 | " emulate_tpu disabled\n"); | |
999 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
1000 | } | |
1fd032ee | 1001 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 1002 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
1003 | break; |
1004 | case WRITE_SAME_16: | |
1005 | sectors = transport_get_sectors_16(cdb); | |
1006 | if (!sectors) { | |
1007 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1008 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1009 | } |
1010 | ||
1fd032ee | 1011 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1012 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
1013 | ||
cd063bef | 1014 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1015 | if (ret) |
cd063bef | 1016 | return ret; |
d6e0175c CH |
1017 | break; |
1018 | case WRITE_SAME: | |
1019 | sectors = transport_get_sectors_10(cdb); | |
1020 | if (!sectors) { | |
1021 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 1022 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
1023 | } |
1024 | ||
1fd032ee | 1025 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
1026 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
1027 | ||
1028 | /* | |
1029 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
1030 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
1031 | */ | |
cd063bef | 1032 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 1033 | if (ret) |
cd063bef | 1034 | return ret; |
d6e0175c CH |
1035 | break; |
1036 | case VERIFY: | |
1fd032ee | 1037 | size = 0; |
c52716de CVB |
1038 | sectors = transport_get_sectors_10(cdb); |
1039 | cmd->t_task_lba = transport_lba_32(cdb); | |
1920ed61 | 1040 | cmd->execute_cmd = sbc_emulate_noop; |
c52716de | 1041 | goto check_lba; |
1a1ff38c BK |
1042 | case REZERO_UNIT: |
1043 | case SEEK_6: | |
1044 | case SEEK_10: | |
1045 | /* | |
1046 | * There are still clients out there which use these old SCSI-2 | |
1047 | * commands. This mainly happens when running VMs with legacy | |
1048 | * guest systems, connected via SCSI command pass-through to | |
1049 | * iSCSI targets. Make them happy and return status GOOD. | |
1050 | */ | |
1051 | size = 0; | |
1052 | cmd->execute_cmd = sbc_emulate_noop; | |
1053 | break; | |
d6e0175c | 1054 | default: |
1fd032ee | 1055 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
1056 | if (ret) |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | /* reject any command that we don't have a handler for */ | |
20959c4b | 1061 | if (!cmd->execute_cmd) |
de103c93 | 1062 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
1063 | |
1064 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee | 1065 | unsigned long long end_lba; |
6ef31dc7 | 1066 | check_lba: |
1fd032ee | 1067 | end_lba = dev->transport->get_blocks(dev) + 1; |
aa179935 NB |
1068 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
1069 | ((cmd->t_task_lba + sectors) > end_lba)) { | |
1fd032ee CH |
1070 | pr_err("cmd exceeds last lba %llu " |
1071 | "(lba %llu, sectors %u)\n", | |
1072 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 1073 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
1074 | } |
1075 | ||
68ff9b9b NB |
1076 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
1077 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
1078 | } |
1079 | ||
de103c93 | 1080 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
1081 | } |
1082 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 1083 | |
6f23ac8a CH |
1084 | u32 sbc_get_device_type(struct se_device *dev) |
1085 | { | |
1086 | return TYPE_DISK; | |
1087 | } | |
1088 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
1089 | |
1090 | sense_reason_t | |
1091 | sbc_execute_unmap(struct se_cmd *cmd, | |
1092 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
1093 | sector_t, sector_t), | |
1094 | void *priv) | |
1095 | { | |
1096 | struct se_device *dev = cmd->se_dev; | |
1097 | unsigned char *buf, *ptr = NULL; | |
1098 | sector_t lba; | |
1099 | int size; | |
1100 | u32 range; | |
1101 | sense_reason_t ret = 0; | |
1102 | int dl, bd_dl; | |
1103 | ||
1104 | /* We never set ANC_SUP */ | |
1105 | if (cmd->t_task_cdb[1]) | |
1106 | return TCM_INVALID_CDB_FIELD; | |
1107 | ||
1108 | if (cmd->data_length == 0) { | |
1109 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | if (cmd->data_length < 8) { | |
1114 | pr_warn("UNMAP parameter list length %u too small\n", | |
1115 | cmd->data_length); | |
1116 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
1117 | } | |
1118 | ||
1119 | buf = transport_kmap_data_sg(cmd); | |
1120 | if (!buf) | |
1121 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
1122 | ||
1123 | dl = get_unaligned_be16(&buf[0]); | |
1124 | bd_dl = get_unaligned_be16(&buf[2]); | |
1125 | ||
1126 | size = cmd->data_length - 8; | |
1127 | if (bd_dl > size) | |
1128 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
1129 | cmd->data_length, bd_dl); | |
1130 | else | |
1131 | size = bd_dl; | |
1132 | ||
1133 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
1134 | ret = TCM_INVALID_PARAMETER_LIST; | |
1135 | goto err; | |
1136 | } | |
1137 | ||
1138 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
1139 | ptr = &buf[8]; | |
1140 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
1141 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
1142 | ||
1143 | while (size >= 16) { | |
1144 | lba = get_unaligned_be64(&ptr[0]); | |
1145 | range = get_unaligned_be32(&ptr[8]); | |
1146 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1147 | (unsigned long long)lba, range); | |
1148 | ||
1149 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1150 | ret = TCM_INVALID_PARAMETER_LIST; | |
1151 | goto err; | |
1152 | } | |
1153 | ||
1154 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1155 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1156 | goto err; | |
1157 | } | |
1158 | ||
1159 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1160 | if (ret) | |
1161 | goto err; | |
1162 | ||
1163 | ptr += 16; | |
1164 | size -= 16; | |
1165 | } | |
1166 | ||
1167 | err: | |
1168 | transport_kunmap_data_sg(cmd); | |
1169 | if (!ret) | |
1170 | target_complete_cmd(cmd, GOOD); | |
1171 | return ret; | |
1172 | } | |
1173 | EXPORT_SYMBOL(sbc_execute_unmap); | |
41861fa8 | 1174 | |
66a3d5bc NB |
1175 | void |
1176 | sbc_dif_generate(struct se_cmd *cmd) | |
1177 | { | |
1178 | struct se_device *dev = cmd->se_dev; | |
1179 | struct se_dif_v1_tuple *sdt; | |
18213afb | 1180 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
66a3d5bc NB |
1181 | sector_t sector = cmd->t_task_lba; |
1182 | void *daddr, *paddr; | |
1183 | int i, j, offset = 0; | |
18213afb | 1184 | unsigned int block_size = dev->dev_attrib.block_size; |
66a3d5bc | 1185 | |
18213afb | 1186 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
66a3d5bc | 1187 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1188 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
66a3d5bc | 1189 | |
18213afb AM |
1190 | for (j = 0; j < psg->length; |
1191 | j += sizeof(struct se_dif_v1_tuple)) { | |
1192 | __u16 crc; | |
1193 | unsigned int avail; | |
66a3d5bc | 1194 | |
18213afb AM |
1195 | if (offset >= dsg->length) { |
1196 | offset -= dsg->length; | |
1197 | kunmap_atomic(daddr - dsg->offset); | |
1198 | dsg = sg_next(dsg); | |
1199 | if (!dsg) { | |
1200 | kunmap_atomic(paddr - psg->offset); | |
1201 | return; | |
1202 | } | |
1203 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
66a3d5bc NB |
1204 | } |
1205 | ||
18213afb AM |
1206 | sdt = paddr + j; |
1207 | avail = min(block_size, dsg->length - offset); | |
1208 | crc = crc_t10dif(daddr + offset, avail); | |
1209 | if (avail < block_size) { | |
1210 | kunmap_atomic(daddr - dsg->offset); | |
1211 | dsg = sg_next(dsg); | |
1212 | if (!dsg) { | |
1213 | kunmap_atomic(paddr - psg->offset); | |
1214 | return; | |
1215 | } | |
1216 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1217 | offset = block_size - avail; | |
1218 | crc = crc_t10dif_update(crc, daddr, offset); | |
1219 | } else { | |
1220 | offset += block_size; | |
1221 | } | |
1222 | ||
1223 | sdt->guard_tag = cpu_to_be16(crc); | |
823ddd87 | 1224 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
66a3d5bc NB |
1225 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
1226 | sdt->app_tag = 0; | |
1227 | ||
6ae50408 | 1228 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
66a3d5bc | 1229 | " app_tag: 0x%04x ref_tag: %u\n", |
6ae50408 NB |
1230 | (cmd->data_direction == DMA_TO_DEVICE) ? |
1231 | "WRITE" : "READ", (unsigned long long)sector, | |
1232 | sdt->guard_tag, sdt->app_tag, | |
1233 | be32_to_cpu(sdt->ref_tag)); | |
66a3d5bc NB |
1234 | |
1235 | sector++; | |
66a3d5bc NB |
1236 | } |
1237 | ||
18213afb AM |
1238 | kunmap_atomic(daddr - dsg->offset); |
1239 | kunmap_atomic(paddr - psg->offset); | |
66a3d5bc NB |
1240 | } |
1241 | } | |
1242 | ||
41861fa8 | 1243 | static sense_reason_t |
823ddd87 | 1244 | sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt, |
18213afb | 1245 | __u16 crc, sector_t sector, unsigned int ei_lba) |
41861fa8 | 1246 | { |
41861fa8 NB |
1247 | __be16 csum; |
1248 | ||
d7a463b0 NB |
1249 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
1250 | goto check_ref; | |
1251 | ||
18213afb | 1252 | csum = cpu_to_be16(crc); |
41861fa8 NB |
1253 | |
1254 | if (sdt->guard_tag != csum) { | |
1255 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" | |
1256 | " csum 0x%04x\n", (unsigned long long)sector, | |
1257 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); | |
1258 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; | |
1259 | } | |
1260 | ||
d7a463b0 NB |
1261 | check_ref: |
1262 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) | |
1263 | return 0; | |
1264 | ||
823ddd87 | 1265 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
41861fa8 NB |
1266 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
1267 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" | |
1268 | " sector MSB: 0x%08x\n", (unsigned long long)sector, | |
1269 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); | |
1270 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1271 | } | |
1272 | ||
823ddd87 | 1273 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
41861fa8 NB |
1274 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
1275 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" | |
1276 | " ei_lba: 0x%08x\n", (unsigned long long)sector, | |
1277 | be32_to_cpu(sdt->ref_tag), ei_lba); | |
1278 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; | |
1279 | } | |
1280 | ||
1281 | return 0; | |
1282 | } | |
1283 | ||
f75b6fae SG |
1284 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
1285 | struct scatterlist *sg, int sg_off) | |
41861fa8 NB |
1286 | { |
1287 | struct se_device *dev = cmd->se_dev; | |
1288 | struct scatterlist *psg; | |
1289 | void *paddr, *addr; | |
1290 | unsigned int i, len, left; | |
10762e80 | 1291 | unsigned int offset = sg_off; |
41861fa8 | 1292 | |
38b57f82 NB |
1293 | if (!sg) |
1294 | return; | |
1295 | ||
41861fa8 NB |
1296 | left = sectors * dev->prot_length; |
1297 | ||
1298 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { | |
16c0ae02 | 1299 | unsigned int psg_len, copied = 0; |
d6a65fdc | 1300 | |
41861fa8 | 1301 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
16c0ae02 SG |
1302 | psg_len = min(left, psg->length); |
1303 | while (psg_len) { | |
1304 | len = min(psg_len, sg->length - offset); | |
1305 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; | |
1306 | ||
1307 | if (read) | |
1308 | memcpy(paddr + copied, addr, len); | |
1309 | else | |
1310 | memcpy(addr, paddr + copied, len); | |
1311 | ||
1312 | left -= len; | |
1313 | offset += len; | |
1314 | copied += len; | |
1315 | psg_len -= len; | |
1316 | ||
57636388 AM |
1317 | kunmap_atomic(addr - sg->offset - offset); |
1318 | ||
16c0ae02 SG |
1319 | if (offset >= sg->length) { |
1320 | sg = sg_next(sg); | |
1321 | offset = 0; | |
1322 | } | |
16c0ae02 | 1323 | } |
57636388 | 1324 | kunmap_atomic(paddr - psg->offset); |
41861fa8 NB |
1325 | } |
1326 | } | |
f75b6fae | 1327 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
41861fa8 NB |
1328 | |
1329 | sense_reason_t | |
f75b6fae | 1330 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
414e4627 | 1331 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
41861fa8 NB |
1332 | { |
1333 | struct se_device *dev = cmd->se_dev; | |
1334 | struct se_dif_v1_tuple *sdt; | |
18213afb | 1335 | struct scatterlist *dsg = cmd->t_data_sg; |
41861fa8 NB |
1336 | sector_t sector = start; |
1337 | void *daddr, *paddr; | |
18213afb | 1338 | int i; |
41861fa8 | 1339 | sense_reason_t rc; |
18213afb AM |
1340 | int dsg_off = 0; |
1341 | unsigned int block_size = dev->dev_attrib.block_size; | |
41861fa8 | 1342 | |
18213afb | 1343 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
414e4627 | 1344 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
18213afb | 1345 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
41861fa8 | 1346 | |
18213afb AM |
1347 | for (i = psg_off; i < psg->length && |
1348 | sector < start + sectors; | |
1349 | i += sizeof(struct se_dif_v1_tuple)) { | |
1350 | __u16 crc; | |
1351 | unsigned int avail; | |
41861fa8 | 1352 | |
18213afb AM |
1353 | if (dsg_off >= dsg->length) { |
1354 | dsg_off -= dsg->length; | |
1355 | kunmap_atomic(daddr - dsg->offset); | |
1356 | dsg = sg_next(dsg); | |
1357 | if (!dsg) { | |
1358 | kunmap_atomic(paddr - psg->offset); | |
1359 | return 0; | |
1360 | } | |
1361 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
41861fa8 NB |
1362 | } |
1363 | ||
18213afb | 1364 | sdt = paddr + i; |
41861fa8 NB |
1365 | |
1366 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" | |
1367 | " app_tag: 0x%04x ref_tag: %u\n", | |
1368 | (unsigned long long)sector, sdt->guard_tag, | |
1369 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); | |
1370 | ||
1371 | if (sdt->app_tag == cpu_to_be16(0xffff)) { | |
18213afb AM |
1372 | dsg_off += block_size; |
1373 | goto next; | |
1374 | } | |
1375 | ||
1376 | avail = min(block_size, dsg->length - dsg_off); | |
1377 | crc = crc_t10dif(daddr + dsg_off, avail); | |
1378 | if (avail < block_size) { | |
1379 | kunmap_atomic(daddr - dsg->offset); | |
1380 | dsg = sg_next(dsg); | |
1381 | if (!dsg) { | |
1382 | kunmap_atomic(paddr - psg->offset); | |
1383 | return 0; | |
1384 | } | |
1385 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; | |
1386 | dsg_off = block_size - avail; | |
1387 | crc = crc_t10dif_update(crc, daddr, dsg_off); | |
1388 | } else { | |
1389 | dsg_off += block_size; | |
41861fa8 NB |
1390 | } |
1391 | ||
18213afb | 1392 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
41861fa8 | 1393 | if (rc) { |
414e4627 | 1394 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1395 | kunmap_atomic(paddr - psg->offset); |
76736db3 | 1396 | cmd->bad_sector = sector; |
41861fa8 NB |
1397 | return rc; |
1398 | } | |
18213afb | 1399 | next: |
41861fa8 NB |
1400 | sector++; |
1401 | ei_lba++; | |
41861fa8 NB |
1402 | } |
1403 | ||
18213afb | 1404 | psg_off = 0; |
414e4627 | 1405 | kunmap_atomic(daddr - dsg->offset); |
18213afb | 1406 | kunmap_atomic(paddr - psg->offset); |
41861fa8 | 1407 | } |
41861fa8 NB |
1408 | |
1409 | return 0; | |
1410 | } | |
f75b6fae | 1411 | EXPORT_SYMBOL(sbc_dif_verify); |