Commit | Line | Data |
---|---|---|
d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
fd9a11d7 | 4 | * (c) Copyright 2002-2012 RisingTide Systems LLC. |
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> | |
26 | #include <asm/unaligned.h> | |
27 | #include <scsi/scsi.h> | |
28 | ||
29 | #include <target/target_core_base.h> | |
30 | #include <target/target_core_backend.h> | |
31 | #include <target/target_core_fabric.h> | |
32 | ||
33 | #include "target_core_internal.h" | |
34 | #include "target_core_ua.h" | |
35 | ||
36 | ||
de103c93 CH |
37 | static sense_reason_t |
38 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
39 | { |
40 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 41 | unsigned char *cdb = cmd->t_task_cdb; |
1fd032ee | 42 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
43 | unsigned char *rbuf; |
44 | unsigned char buf[8]; | |
1fd032ee CH |
45 | u32 blocks; |
46 | ||
8dc8632a RD |
47 | /* |
48 | * SBC-2 says: | |
49 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
50 | * ADDRESS field is not set to zero, the device server shall | |
51 | * terminate the command with CHECK CONDITION status with | |
52 | * the sense key set to ILLEGAL REQUEST and the additional | |
53 | * sense code set to INVALID FIELD IN CDB. | |
54 | * | |
55 | * In SBC-3, these fields are obsolete, but some SCSI | |
56 | * compliance tests actually check this, so we might as well | |
57 | * follow SBC-2. | |
58 | */ | |
59 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
60 | return TCM_INVALID_CDB_FIELD; | |
61 | ||
1fd032ee CH |
62 | if (blocks_long >= 0x00000000ffffffff) |
63 | blocks = 0xffffffff; | |
64 | else | |
65 | blocks = (u32)blocks_long; | |
66 | ||
1fd032ee CH |
67 | buf[0] = (blocks >> 24) & 0xff; |
68 | buf[1] = (blocks >> 16) & 0xff; | |
69 | buf[2] = (blocks >> 8) & 0xff; | |
70 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
71 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
72 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
73 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
74 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 75 | |
a50da144 | 76 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
77 | if (rbuf) { |
78 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
79 | transport_kunmap_data_sg(cmd); | |
80 | } | |
1fd032ee CH |
81 | |
82 | target_complete_cmd(cmd, GOOD); | |
83 | return 0; | |
84 | } | |
85 | ||
de103c93 CH |
86 | static sense_reason_t |
87 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
88 | { |
89 | struct se_device *dev = cmd->se_dev; | |
a50da144 PB |
90 | unsigned char *rbuf; |
91 | unsigned char buf[32]; | |
1fd032ee CH |
92 | unsigned long long blocks = dev->transport->get_blocks(dev); |
93 | ||
a50da144 | 94 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
95 | buf[0] = (blocks >> 56) & 0xff; |
96 | buf[1] = (blocks >> 48) & 0xff; | |
97 | buf[2] = (blocks >> 40) & 0xff; | |
98 | buf[3] = (blocks >> 32) & 0xff; | |
99 | buf[4] = (blocks >> 24) & 0xff; | |
100 | buf[5] = (blocks >> 16) & 0xff; | |
101 | buf[6] = (blocks >> 8) & 0xff; | |
102 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
103 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
104 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
105 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
106 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee CH |
107 | /* |
108 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
109 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
110 | */ | |
0fd97ccf | 111 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
1fd032ee CH |
112 | buf[14] = 0x80; |
113 | ||
a50da144 | 114 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
115 | if (rbuf) { |
116 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
117 | transport_kunmap_data_sg(cmd); | |
118 | } | |
1fd032ee CH |
119 | |
120 | target_complete_cmd(cmd, GOOD); | |
121 | return 0; | |
122 | } | |
123 | ||
972b29c8 | 124 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 125 | { |
1fd032ee | 126 | u32 num_blocks; |
1fd032ee CH |
127 | |
128 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
129 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
130 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
131 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
132 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
133 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
134 | ||
135 | /* | |
136 | * Use the explicit range when non zero is supplied, otherwise calculate | |
137 | * the remaining range based on ->get_blocks() - starting LBA. | |
138 | */ | |
6f974e8c CH |
139 | if (num_blocks) |
140 | return num_blocks; | |
1fd032ee | 141 | |
6f974e8c CH |
142 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
143 | cmd->t_task_lba + 1; | |
1fd032ee | 144 | } |
972b29c8 | 145 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 146 | |
de103c93 | 147 | static sense_reason_t |
1920ed61 | 148 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
149 | { |
150 | target_complete_cmd(cmd, GOOD); | |
151 | return 0; | |
152 | } | |
153 | ||
d6e0175c CH |
154 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
155 | { | |
0fd97ccf | 156 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
157 | } |
158 | ||
159 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
160 | { | |
161 | struct se_device *dev = cmd->se_dev; | |
162 | unsigned long long end_lba; | |
163 | u32 sectors; | |
164 | ||
0fd97ccf | 165 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
d6e0175c CH |
166 | end_lba = dev->transport->get_blocks(dev) + 1; |
167 | ||
168 | if (cmd->t_task_lba + sectors > end_lba) { | |
169 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
170 | cmd->t_task_lba, sectors, end_lba); | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
178 | { | |
179 | /* | |
180 | * Use 8-bit sector value. SBC-3 says: | |
181 | * | |
182 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
183 | * logical blocks shall be written. Any other value | |
184 | * specifies the number of logical blocks that shall be | |
185 | * written. | |
186 | */ | |
187 | return cdb[4] ? : 256; | |
188 | } | |
189 | ||
190 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
191 | { | |
192 | return (u32)(cdb[7] << 8) + cdb[8]; | |
193 | } | |
194 | ||
195 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
196 | { | |
197 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
198 | } | |
199 | ||
200 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
201 | { | |
202 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
203 | (cdb[12] << 8) + cdb[13]; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
208 | */ | |
209 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
210 | { | |
211 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
212 | (cdb[30] << 8) + cdb[31]; | |
213 | ||
214 | } | |
215 | ||
216 | static inline u32 transport_lba_21(unsigned char *cdb) | |
217 | { | |
218 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
219 | } | |
220 | ||
221 | static inline u32 transport_lba_32(unsigned char *cdb) | |
222 | { | |
223 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
224 | } | |
225 | ||
226 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
227 | { | |
228 | unsigned int __v1, __v2; | |
229 | ||
230 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
231 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
232 | ||
233 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
234 | } | |
235 | ||
236 | /* | |
237 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
238 | */ | |
239 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
240 | { | |
241 | unsigned int __v1, __v2; | |
242 | ||
243 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
244 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
245 | ||
246 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
247 | } | |
248 | ||
cd063bef NB |
249 | static sense_reason_t |
250 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 251 | { |
972b29c8 | 252 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
773cbaf7 | 253 | |
d6e0175c CH |
254 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
255 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
256 | " bits not supported for Block Discard" | |
257 | " Emulation\n"); | |
cd063bef | 258 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 259 | } |
773cbaf7 NB |
260 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
261 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
262 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
263 | return TCM_INVALID_CDB_FIELD; | |
264 | } | |
d6e0175c | 265 | /* |
cd063bef NB |
266 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
267 | * translated into block discard requests within backend code. | |
d6e0175c | 268 | */ |
cd063bef NB |
269 | if (flags[0] & 0x08) { |
270 | if (!ops->execute_write_same_unmap) | |
271 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
272 | ||
273 | cmd->execute_cmd = ops->execute_write_same_unmap; | |
274 | return 0; | |
d6e0175c | 275 | } |
cd063bef NB |
276 | if (!ops->execute_write_same) |
277 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 278 | |
cd063bef | 279 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
280 | return 0; |
281 | } | |
282 | ||
283 | static void xdreadwrite_callback(struct se_cmd *cmd) | |
284 | { | |
285 | unsigned char *buf, *addr; | |
286 | struct scatterlist *sg; | |
287 | unsigned int offset; | |
288 | int i; | |
289 | int count; | |
290 | /* | |
291 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
292 | * | |
293 | * 1) read the specified logical block(s); | |
294 | * 2) transfer logical blocks from the data-out buffer; | |
295 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
296 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
297 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
298 | * blocks transferred from the data-out buffer; and | |
299 | * 5) transfer the resulting XOR data to the data-in buffer. | |
300 | */ | |
301 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
302 | if (!buf) { | |
303 | pr_err("Unable to allocate xor_callback buf\n"); | |
304 | return; | |
305 | } | |
306 | /* | |
307 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
308 | * into the locally allocated *buf | |
309 | */ | |
310 | sg_copy_to_buffer(cmd->t_data_sg, | |
311 | cmd->t_data_nents, | |
312 | buf, | |
313 | cmd->data_length); | |
314 | ||
315 | /* | |
316 | * Now perform the XOR against the BIDI read memory located at | |
317 | * cmd->t_mem_bidi_list | |
318 | */ | |
319 | ||
320 | offset = 0; | |
321 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
322 | addr = kmap_atomic(sg_page(sg)); | |
323 | if (!addr) | |
324 | goto out; | |
325 | ||
326 | for (i = 0; i < sg->length; i++) | |
327 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
328 | ||
329 | offset += sg->length; | |
330 | kunmap_atomic(addr); | |
331 | } | |
332 | ||
333 | out: | |
334 | kfree(buf); | |
335 | } | |
336 | ||
de103c93 CH |
337 | sense_reason_t |
338 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 339 | { |
d6e0175c CH |
340 | struct se_device *dev = cmd->se_dev; |
341 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 342 | unsigned int size; |
d6e0175c | 343 | u32 sectors = 0; |
de103c93 | 344 | sense_reason_t ret; |
d6e0175c CH |
345 | |
346 | switch (cdb[0]) { | |
347 | case READ_6: | |
348 | sectors = transport_get_sectors_6(cdb); | |
349 | cmd->t_task_lba = transport_lba_21(cdb); | |
350 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 351 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
352 | break; |
353 | case READ_10: | |
354 | sectors = transport_get_sectors_10(cdb); | |
355 | cmd->t_task_lba = transport_lba_32(cdb); | |
356 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 357 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
358 | break; |
359 | case READ_12: | |
360 | sectors = transport_get_sectors_12(cdb); | |
361 | cmd->t_task_lba = transport_lba_32(cdb); | |
362 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 363 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
364 | break; |
365 | case READ_16: | |
366 | sectors = transport_get_sectors_16(cdb); | |
367 | cmd->t_task_lba = transport_lba_64(cdb); | |
368 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 369 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
370 | break; |
371 | case WRITE_6: | |
372 | sectors = transport_get_sectors_6(cdb); | |
373 | cmd->t_task_lba = transport_lba_21(cdb); | |
374 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 375 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
376 | break; |
377 | case WRITE_10: | |
378 | case WRITE_VERIFY: | |
379 | sectors = transport_get_sectors_10(cdb); | |
380 | cmd->t_task_lba = transport_lba_32(cdb); | |
381 | if (cdb[1] & 0x8) | |
382 | cmd->se_cmd_flags |= SCF_FUA; | |
383 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 384 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
385 | break; |
386 | case WRITE_12: | |
387 | sectors = transport_get_sectors_12(cdb); | |
388 | cmd->t_task_lba = transport_lba_32(cdb); | |
389 | if (cdb[1] & 0x8) | |
390 | cmd->se_cmd_flags |= SCF_FUA; | |
391 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 392 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
393 | break; |
394 | case WRITE_16: | |
395 | sectors = transport_get_sectors_16(cdb); | |
396 | cmd->t_task_lba = transport_lba_64(cdb); | |
397 | if (cdb[1] & 0x8) | |
398 | cmd->se_cmd_flags |= SCF_FUA; | |
399 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 400 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
401 | break; |
402 | case XDWRITEREAD_10: | |
de103c93 | 403 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 404 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 405 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
406 | sectors = transport_get_sectors_10(cdb); |
407 | ||
408 | cmd->t_task_lba = transport_lba_32(cdb); | |
409 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
410 | ||
411 | /* | |
412 | * Setup BIDI XOR callback to be run after I/O completion. | |
413 | */ | |
0c2ad7d1 | 414 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
415 | cmd->transport_complete_callback = &xdreadwrite_callback; |
416 | if (cdb[1] & 0x8) | |
417 | cmd->se_cmd_flags |= SCF_FUA; | |
418 | break; | |
419 | case VARIABLE_LENGTH_CMD: | |
420 | { | |
421 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
422 | switch (service_action) { | |
423 | case XDWRITEREAD_32: | |
424 | sectors = transport_get_sectors_32(cdb); | |
425 | ||
426 | /* | |
427 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
428 | * XDWRITE_READ_32 logic. | |
429 | */ | |
430 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
431 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
432 | ||
433 | /* | |
434 | * Setup BIDI XOR callback to be run during after I/O | |
435 | * completion. | |
436 | */ | |
0c2ad7d1 | 437 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
438 | cmd->transport_complete_callback = &xdreadwrite_callback; |
439 | if (cdb[1] & 0x8) | |
440 | cmd->se_cmd_flags |= SCF_FUA; | |
441 | break; | |
442 | case WRITE_SAME_32: | |
443 | sectors = transport_get_sectors_32(cdb); | |
444 | if (!sectors) { | |
445 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
446 | " supported\n"); | |
de103c93 | 447 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
448 | } |
449 | ||
1fd032ee | 450 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
451 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
452 | ||
cd063bef | 453 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 454 | if (ret) |
cd063bef | 455 | return ret; |
d6e0175c CH |
456 | break; |
457 | default: | |
458 | pr_err("VARIABLE_LENGTH_CMD service action" | |
459 | " 0x%04x not supported\n", service_action); | |
de103c93 | 460 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
461 | } |
462 | break; | |
463 | } | |
464 | case READ_CAPACITY: | |
1fd032ee CH |
465 | size = READ_CAP_LEN; |
466 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
467 | break; |
468 | case SERVICE_ACTION_IN: | |
469 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
470 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 471 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c CH |
472 | break; |
473 | default: | |
474 | pr_err("Unsupported SA: 0x%02x\n", | |
475 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 476 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 477 | } |
1fd032ee | 478 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
479 | (cdb[12] << 8) | cdb[13]; |
480 | break; | |
481 | case SYNCHRONIZE_CACHE: | |
482 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
483 | if (!ops->execute_sync_cache) { |
484 | size = 0; | |
485 | cmd->execute_cmd = sbc_emulate_noop; | |
486 | break; | |
487 | } | |
ad67f0d9 | 488 | |
d6e0175c CH |
489 | /* |
490 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
491 | */ | |
492 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
493 | sectors = transport_get_sectors_10(cdb); | |
494 | cmd->t_task_lba = transport_lba_32(cdb); | |
495 | } else { | |
496 | sectors = transport_get_sectors_16(cdb); | |
497 | cmd->t_task_lba = transport_lba_64(cdb); | |
498 | } | |
499 | ||
1fd032ee | 500 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
501 | |
502 | /* | |
503 | * Check to ensure that LBA + Range does not exceed past end of | |
504 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
505 | */ | |
506 | if (cmd->t_task_lba || sectors) { | |
507 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 508 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 509 | } |
ad67f0d9 | 510 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
511 | break; |
512 | case UNMAP: | |
14150a6b | 513 | if (!ops->execute_unmap) |
de103c93 | 514 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 515 | |
1fd032ee | 516 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 517 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
518 | break; |
519 | case WRITE_SAME_16: | |
520 | sectors = transport_get_sectors_16(cdb); | |
521 | if (!sectors) { | |
522 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 523 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
524 | } |
525 | ||
1fd032ee | 526 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
527 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
528 | ||
cd063bef | 529 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 530 | if (ret) |
cd063bef | 531 | return ret; |
d6e0175c CH |
532 | break; |
533 | case WRITE_SAME: | |
534 | sectors = transport_get_sectors_10(cdb); | |
535 | if (!sectors) { | |
536 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 537 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
538 | } |
539 | ||
1fd032ee | 540 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
541 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
542 | ||
543 | /* | |
544 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
545 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
546 | */ | |
cd063bef | 547 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 548 | if (ret) |
cd063bef | 549 | return ret; |
d6e0175c CH |
550 | break; |
551 | case VERIFY: | |
1fd032ee | 552 | size = 0; |
1920ed61 | 553 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 554 | break; |
1a1ff38c BK |
555 | case REZERO_UNIT: |
556 | case SEEK_6: | |
557 | case SEEK_10: | |
558 | /* | |
559 | * There are still clients out there which use these old SCSI-2 | |
560 | * commands. This mainly happens when running VMs with legacy | |
561 | * guest systems, connected via SCSI command pass-through to | |
562 | * iSCSI targets. Make them happy and return status GOOD. | |
563 | */ | |
564 | size = 0; | |
565 | cmd->execute_cmd = sbc_emulate_noop; | |
566 | break; | |
d6e0175c | 567 | default: |
1fd032ee | 568 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
569 | if (ret) |
570 | return ret; | |
571 | } | |
572 | ||
573 | /* reject any command that we don't have a handler for */ | |
574 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 575 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
576 | |
577 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
578 | unsigned long long end_lba; |
579 | ||
0fd97ccf | 580 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
581 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
582 | " big sectors %u exceeds fabric_max_sectors:" | |
583 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 584 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 585 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 586 | } |
0fd97ccf | 587 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
588 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
589 | " big sectors %u exceeds backend hw_max_sectors:" | |
590 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 591 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 592 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
593 | } |
594 | ||
1fd032ee CH |
595 | end_lba = dev->transport->get_blocks(dev) + 1; |
596 | if (cmd->t_task_lba + sectors > end_lba) { | |
597 | pr_err("cmd exceeds last lba %llu " | |
598 | "(lba %llu, sectors %u)\n", | |
599 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 600 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
601 | } |
602 | ||
603 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
604 | } |
605 | ||
de103c93 | 606 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
607 | } |
608 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 609 | |
6f23ac8a CH |
610 | u32 sbc_get_device_type(struct se_device *dev) |
611 | { | |
612 | return TYPE_DISK; | |
613 | } | |
614 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
615 | |
616 | sense_reason_t | |
617 | sbc_execute_unmap(struct se_cmd *cmd, | |
618 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
619 | sector_t, sector_t), | |
620 | void *priv) | |
621 | { | |
622 | struct se_device *dev = cmd->se_dev; | |
623 | unsigned char *buf, *ptr = NULL; | |
624 | sector_t lba; | |
625 | int size; | |
626 | u32 range; | |
627 | sense_reason_t ret = 0; | |
628 | int dl, bd_dl; | |
629 | ||
630 | /* We never set ANC_SUP */ | |
631 | if (cmd->t_task_cdb[1]) | |
632 | return TCM_INVALID_CDB_FIELD; | |
633 | ||
634 | if (cmd->data_length == 0) { | |
635 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | if (cmd->data_length < 8) { | |
640 | pr_warn("UNMAP parameter list length %u too small\n", | |
641 | cmd->data_length); | |
642 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
643 | } | |
644 | ||
645 | buf = transport_kmap_data_sg(cmd); | |
646 | if (!buf) | |
647 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
648 | ||
649 | dl = get_unaligned_be16(&buf[0]); | |
650 | bd_dl = get_unaligned_be16(&buf[2]); | |
651 | ||
652 | size = cmd->data_length - 8; | |
653 | if (bd_dl > size) | |
654 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
655 | cmd->data_length, bd_dl); | |
656 | else | |
657 | size = bd_dl; | |
658 | ||
659 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
660 | ret = TCM_INVALID_PARAMETER_LIST; | |
661 | goto err; | |
662 | } | |
663 | ||
664 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
665 | ptr = &buf[8]; | |
666 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
667 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
668 | ||
669 | while (size >= 16) { | |
670 | lba = get_unaligned_be64(&ptr[0]); | |
671 | range = get_unaligned_be32(&ptr[8]); | |
672 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
673 | (unsigned long long)lba, range); | |
674 | ||
675 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
676 | ret = TCM_INVALID_PARAMETER_LIST; | |
677 | goto err; | |
678 | } | |
679 | ||
680 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
681 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
682 | goto err; | |
683 | } | |
684 | ||
685 | ret = do_unmap_fn(cmd, priv, lba, range); | |
686 | if (ret) | |
687 | goto err; | |
688 | ||
689 | ptr += 16; | |
690 | size -= 16; | |
691 | } | |
692 | ||
693 | err: | |
694 | transport_kunmap_data_sg(cmd); | |
695 | if (!ret) | |
696 | target_complete_cmd(cmd, GOOD); | |
697 | return ret; | |
698 | } | |
699 | EXPORT_SYMBOL(sbc_execute_unmap); |