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