Commit | Line | Data |
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d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. | |
5 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. | |
6 | * Copyright (c) 2007-2010 Rising Tide Systems | |
7 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
8 | * | |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/ratelimit.h> | |
29 | #include <asm/unaligned.h> | |
30 | #include <scsi/scsi.h> | |
31 | ||
32 | #include <target/target_core_base.h> | |
33 | #include <target/target_core_backend.h> | |
34 | #include <target/target_core_fabric.h> | |
35 | ||
36 | #include "target_core_internal.h" | |
37 | #include "target_core_ua.h" | |
38 | ||
39 | ||
1fd032ee CH |
40 | static int sbc_emulate_readcapacity(struct se_cmd *cmd) |
41 | { | |
42 | struct se_device *dev = cmd->se_dev; | |
1fd032ee | 43 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
a50da144 PB |
44 | unsigned char *rbuf; |
45 | unsigned char buf[8]; | |
1fd032ee CH |
46 | u32 blocks; |
47 | ||
48 | if (blocks_long >= 0x00000000ffffffff) | |
49 | blocks = 0xffffffff; | |
50 | else | |
51 | blocks = (u32)blocks_long; | |
52 | ||
1fd032ee CH |
53 | buf[0] = (blocks >> 24) & 0xff; |
54 | buf[1] = (blocks >> 16) & 0xff; | |
55 | buf[2] = (blocks >> 8) & 0xff; | |
56 | buf[3] = blocks & 0xff; | |
57 | buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; | |
58 | buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; | |
59 | buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; | |
60 | buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; | |
61 | ||
a50da144 PB |
62 | rbuf = transport_kmap_data_sg(cmd); |
63 | if (rbuf) { | |
64 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
65 | transport_kunmap_data_sg(cmd); | |
66 | } | |
1fd032ee CH |
67 | |
68 | target_complete_cmd(cmd, GOOD); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static int sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
73 | { | |
74 | struct se_device *dev = cmd->se_dev; | |
a50da144 PB |
75 | unsigned char *rbuf; |
76 | unsigned char buf[32]; | |
1fd032ee CH |
77 | unsigned long long blocks = dev->transport->get_blocks(dev); |
78 | ||
a50da144 | 79 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
80 | buf[0] = (blocks >> 56) & 0xff; |
81 | buf[1] = (blocks >> 48) & 0xff; | |
82 | buf[2] = (blocks >> 40) & 0xff; | |
83 | buf[3] = (blocks >> 32) & 0xff; | |
84 | buf[4] = (blocks >> 24) & 0xff; | |
85 | buf[5] = (blocks >> 16) & 0xff; | |
86 | buf[6] = (blocks >> 8) & 0xff; | |
87 | buf[7] = blocks & 0xff; | |
88 | buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; | |
89 | buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; | |
90 | buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; | |
91 | buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; | |
92 | /* | |
93 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
94 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
95 | */ | |
96 | if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) | |
97 | buf[14] = 0x80; | |
98 | ||
a50da144 PB |
99 | rbuf = transport_kmap_data_sg(cmd); |
100 | if (rbuf) { | |
101 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
102 | transport_kunmap_data_sg(cmd); | |
103 | } | |
1fd032ee CH |
104 | |
105 | target_complete_cmd(cmd, GOOD); | |
106 | return 0; | |
107 | } | |
108 | ||
6f974e8c | 109 | int spc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 110 | { |
1fd032ee | 111 | u32 num_blocks; |
1fd032ee CH |
112 | |
113 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
114 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
115 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
116 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
117 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
118 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
119 | ||
120 | /* | |
121 | * Use the explicit range when non zero is supplied, otherwise calculate | |
122 | * the remaining range based on ->get_blocks() - starting LBA. | |
123 | */ | |
6f974e8c CH |
124 | if (num_blocks) |
125 | return num_blocks; | |
1fd032ee | 126 | |
6f974e8c CH |
127 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
128 | cmd->t_task_lba + 1; | |
1fd032ee | 129 | } |
6f974e8c | 130 | EXPORT_SYMBOL(spc_get_write_same_sectors); |
1fd032ee | 131 | |
1fd032ee CH |
132 | static int sbc_emulate_verify(struct se_cmd *cmd) |
133 | { | |
134 | target_complete_cmd(cmd, GOOD); | |
135 | return 0; | |
136 | } | |
137 | ||
1a1ff38c BK |
138 | static int sbc_emulate_noop(struct se_cmd *cmd) |
139 | { | |
140 | target_complete_cmd(cmd, GOOD); | |
141 | return 0; | |
142 | } | |
143 | ||
d6e0175c CH |
144 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
145 | { | |
146 | return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors; | |
147 | } | |
148 | ||
149 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
150 | { | |
151 | struct se_device *dev = cmd->se_dev; | |
152 | unsigned long long end_lba; | |
153 | u32 sectors; | |
154 | ||
155 | sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size; | |
156 | end_lba = dev->transport->get_blocks(dev) + 1; | |
157 | ||
158 | if (cmd->t_task_lba + sectors > end_lba) { | |
159 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
160 | cmd->t_task_lba, sectors, end_lba); | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
168 | { | |
169 | /* | |
170 | * Use 8-bit sector value. SBC-3 says: | |
171 | * | |
172 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
173 | * logical blocks shall be written. Any other value | |
174 | * specifies the number of logical blocks that shall be | |
175 | * written. | |
176 | */ | |
177 | return cdb[4] ? : 256; | |
178 | } | |
179 | ||
180 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
181 | { | |
182 | return (u32)(cdb[7] << 8) + cdb[8]; | |
183 | } | |
184 | ||
185 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
186 | { | |
187 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
188 | } | |
189 | ||
190 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
191 | { | |
192 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
193 | (cdb[12] << 8) + cdb[13]; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
198 | */ | |
199 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
200 | { | |
201 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
202 | (cdb[30] << 8) + cdb[31]; | |
203 | ||
204 | } | |
205 | ||
206 | static inline u32 transport_lba_21(unsigned char *cdb) | |
207 | { | |
208 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
209 | } | |
210 | ||
211 | static inline u32 transport_lba_32(unsigned char *cdb) | |
212 | { | |
213 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
214 | } | |
215 | ||
216 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
217 | { | |
218 | unsigned int __v1, __v2; | |
219 | ||
220 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
221 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
222 | ||
223 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
224 | } | |
225 | ||
226 | /* | |
227 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
228 | */ | |
229 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
230 | { | |
231 | unsigned int __v1, __v2; | |
232 | ||
233 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
234 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
235 | ||
236 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
237 | } | |
238 | ||
239 | static int sbc_write_same_supported(struct se_device *dev, | |
240 | unsigned char *flags) | |
241 | { | |
242 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
243 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
244 | " bits not supported for Block Discard" | |
245 | " Emulation\n"); | |
246 | return -ENOSYS; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Currently for the emulated case we only accept | |
251 | * tpws with the UNMAP=1 bit set. | |
252 | */ | |
253 | if (!(flags[0] & 0x08)) { | |
254 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
255 | " supported for Block Discard Emulation\n"); | |
256 | return -ENOSYS; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static void xdreadwrite_callback(struct se_cmd *cmd) | |
263 | { | |
264 | unsigned char *buf, *addr; | |
265 | struct scatterlist *sg; | |
266 | unsigned int offset; | |
267 | int i; | |
268 | int count; | |
269 | /* | |
270 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
271 | * | |
272 | * 1) read the specified logical block(s); | |
273 | * 2) transfer logical blocks from the data-out buffer; | |
274 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
275 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
276 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
277 | * blocks transferred from the data-out buffer; and | |
278 | * 5) transfer the resulting XOR data to the data-in buffer. | |
279 | */ | |
280 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
281 | if (!buf) { | |
282 | pr_err("Unable to allocate xor_callback buf\n"); | |
283 | return; | |
284 | } | |
285 | /* | |
286 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
287 | * into the locally allocated *buf | |
288 | */ | |
289 | sg_copy_to_buffer(cmd->t_data_sg, | |
290 | cmd->t_data_nents, | |
291 | buf, | |
292 | cmd->data_length); | |
293 | ||
294 | /* | |
295 | * Now perform the XOR against the BIDI read memory located at | |
296 | * cmd->t_mem_bidi_list | |
297 | */ | |
298 | ||
299 | offset = 0; | |
300 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
301 | addr = kmap_atomic(sg_page(sg)); | |
302 | if (!addr) | |
303 | goto out; | |
304 | ||
305 | for (i = 0; i < sg->length; i++) | |
306 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
307 | ||
308 | offset += sg->length; | |
309 | kunmap_atomic(addr); | |
310 | } | |
311 | ||
312 | out: | |
313 | kfree(buf); | |
314 | } | |
315 | ||
0c2ad7d1 | 316 | int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops) |
d6e0175c CH |
317 | { |
318 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; | |
319 | struct se_device *dev = cmd->se_dev; | |
320 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 321 | unsigned int size; |
d6e0175c CH |
322 | u32 sectors = 0; |
323 | int ret; | |
324 | ||
325 | switch (cdb[0]) { | |
326 | case READ_6: | |
327 | sectors = transport_get_sectors_6(cdb); | |
328 | cmd->t_task_lba = transport_lba_21(cdb); | |
329 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 330 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
331 | break; |
332 | case READ_10: | |
333 | sectors = transport_get_sectors_10(cdb); | |
334 | cmd->t_task_lba = transport_lba_32(cdb); | |
335 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 336 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
337 | break; |
338 | case READ_12: | |
339 | sectors = transport_get_sectors_12(cdb); | |
340 | cmd->t_task_lba = transport_lba_32(cdb); | |
341 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 342 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
343 | break; |
344 | case READ_16: | |
345 | sectors = transport_get_sectors_16(cdb); | |
346 | cmd->t_task_lba = transport_lba_64(cdb); | |
347 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 348 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
349 | break; |
350 | case WRITE_6: | |
351 | sectors = transport_get_sectors_6(cdb); | |
352 | cmd->t_task_lba = transport_lba_21(cdb); | |
353 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 354 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
355 | break; |
356 | case WRITE_10: | |
357 | case WRITE_VERIFY: | |
358 | sectors = transport_get_sectors_10(cdb); | |
359 | cmd->t_task_lba = transport_lba_32(cdb); | |
360 | if (cdb[1] & 0x8) | |
361 | cmd->se_cmd_flags |= SCF_FUA; | |
362 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 363 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
364 | break; |
365 | case WRITE_12: | |
366 | sectors = transport_get_sectors_12(cdb); | |
367 | cmd->t_task_lba = transport_lba_32(cdb); | |
368 | if (cdb[1] & 0x8) | |
369 | cmd->se_cmd_flags |= SCF_FUA; | |
370 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 371 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
372 | break; |
373 | case WRITE_16: | |
374 | sectors = transport_get_sectors_16(cdb); | |
375 | cmd->t_task_lba = transport_lba_64(cdb); | |
376 | if (cdb[1] & 0x8) | |
377 | cmd->se_cmd_flags |= SCF_FUA; | |
378 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 379 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
380 | break; |
381 | case XDWRITEREAD_10: | |
382 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
383 | !(cmd->se_cmd_flags & SCF_BIDI)) | |
384 | goto out_invalid_cdb_field; | |
385 | sectors = transport_get_sectors_10(cdb); | |
386 | ||
387 | cmd->t_task_lba = transport_lba_32(cdb); | |
388 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
389 | ||
390 | /* | |
391 | * Setup BIDI XOR callback to be run after I/O completion. | |
392 | */ | |
0c2ad7d1 | 393 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
394 | cmd->transport_complete_callback = &xdreadwrite_callback; |
395 | if (cdb[1] & 0x8) | |
396 | cmd->se_cmd_flags |= SCF_FUA; | |
397 | break; | |
398 | case VARIABLE_LENGTH_CMD: | |
399 | { | |
400 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
401 | switch (service_action) { | |
402 | case XDWRITEREAD_32: | |
403 | sectors = transport_get_sectors_32(cdb); | |
404 | ||
405 | /* | |
406 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
407 | * XDWRITE_READ_32 logic. | |
408 | */ | |
409 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
410 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
411 | ||
412 | /* | |
413 | * Setup BIDI XOR callback to be run during after I/O | |
414 | * completion. | |
415 | */ | |
0c2ad7d1 | 416 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
417 | cmd->transport_complete_callback = &xdreadwrite_callback; |
418 | if (cdb[1] & 0x8) | |
419 | cmd->se_cmd_flags |= SCF_FUA; | |
420 | break; | |
421 | case WRITE_SAME_32: | |
6f974e8c CH |
422 | if (!ops->execute_write_same) |
423 | goto out_unsupported_cdb; | |
424 | ||
d6e0175c CH |
425 | sectors = transport_get_sectors_32(cdb); |
426 | if (!sectors) { | |
427 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
428 | " supported\n"); | |
429 | goto out_invalid_cdb_field; | |
430 | } | |
431 | ||
1fd032ee | 432 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
433 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
434 | ||
435 | if (sbc_write_same_supported(dev, &cdb[10]) < 0) | |
436 | goto out_unsupported_cdb; | |
6f974e8c | 437 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
438 | break; |
439 | default: | |
440 | pr_err("VARIABLE_LENGTH_CMD service action" | |
441 | " 0x%04x not supported\n", service_action); | |
442 | goto out_unsupported_cdb; | |
443 | } | |
444 | break; | |
445 | } | |
446 | case READ_CAPACITY: | |
1fd032ee CH |
447 | size = READ_CAP_LEN; |
448 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
449 | break; |
450 | case SERVICE_ACTION_IN: | |
451 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
452 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 453 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c CH |
454 | break; |
455 | default: | |
456 | pr_err("Unsupported SA: 0x%02x\n", | |
457 | cmd->t_task_cdb[1] & 0x1f); | |
458 | goto out_invalid_cdb_field; | |
459 | } | |
1fd032ee | 460 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
461 | (cdb[12] << 8) | cdb[13]; |
462 | break; | |
463 | case SYNCHRONIZE_CACHE: | |
464 | case SYNCHRONIZE_CACHE_16: | |
ad67f0d9 CH |
465 | if (!ops->execute_sync_cache) |
466 | goto out_unsupported_cdb; | |
467 | ||
d6e0175c CH |
468 | /* |
469 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
470 | */ | |
471 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
472 | sectors = transport_get_sectors_10(cdb); | |
473 | cmd->t_task_lba = transport_lba_32(cdb); | |
474 | } else { | |
475 | sectors = transport_get_sectors_16(cdb); | |
476 | cmd->t_task_lba = transport_lba_64(cdb); | |
477 | } | |
478 | ||
1fd032ee | 479 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
480 | |
481 | /* | |
482 | * Check to ensure that LBA + Range does not exceed past end of | |
483 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
484 | */ | |
485 | if (cmd->t_task_lba || sectors) { | |
486 | if (sbc_check_valid_sectors(cmd) < 0) | |
487 | goto out_invalid_cdb_field; | |
488 | } | |
ad67f0d9 | 489 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
490 | break; |
491 | case UNMAP: | |
14150a6b CH |
492 | if (!ops->execute_unmap) |
493 | goto out_unsupported_cdb; | |
494 | ||
1fd032ee | 495 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 496 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
497 | break; |
498 | case WRITE_SAME_16: | |
6f974e8c CH |
499 | if (!ops->execute_write_same) |
500 | goto out_unsupported_cdb; | |
501 | ||
d6e0175c CH |
502 | sectors = transport_get_sectors_16(cdb); |
503 | if (!sectors) { | |
504 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
505 | goto out_invalid_cdb_field; | |
506 | } | |
507 | ||
1fd032ee | 508 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
509 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
510 | ||
511 | if (sbc_write_same_supported(dev, &cdb[1]) < 0) | |
512 | goto out_unsupported_cdb; | |
6f974e8c | 513 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
514 | break; |
515 | case WRITE_SAME: | |
6f974e8c CH |
516 | if (!ops->execute_write_same) |
517 | goto out_unsupported_cdb; | |
518 | ||
d6e0175c CH |
519 | sectors = transport_get_sectors_10(cdb); |
520 | if (!sectors) { | |
521 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
522 | goto out_invalid_cdb_field; | |
523 | } | |
524 | ||
1fd032ee | 525 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
526 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
527 | ||
528 | /* | |
529 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
530 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
531 | */ | |
532 | if (sbc_write_same_supported(dev, &cdb[1]) < 0) | |
533 | goto out_unsupported_cdb; | |
6f974e8c | 534 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
535 | break; |
536 | case VERIFY: | |
1fd032ee CH |
537 | size = 0; |
538 | cmd->execute_cmd = sbc_emulate_verify; | |
d6e0175c | 539 | break; |
1a1ff38c BK |
540 | case REZERO_UNIT: |
541 | case SEEK_6: | |
542 | case SEEK_10: | |
543 | /* | |
544 | * There are still clients out there which use these old SCSI-2 | |
545 | * commands. This mainly happens when running VMs with legacy | |
546 | * guest systems, connected via SCSI command pass-through to | |
547 | * iSCSI targets. Make them happy and return status GOOD. | |
548 | */ | |
549 | size = 0; | |
550 | cmd->execute_cmd = sbc_emulate_noop; | |
551 | break; | |
d6e0175c | 552 | default: |
1fd032ee | 553 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
554 | if (ret) |
555 | return ret; | |
556 | } | |
557 | ||
558 | /* reject any command that we don't have a handler for */ | |
559 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
560 | goto out_unsupported_cdb; | |
561 | ||
562 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
563 | unsigned long long end_lba; |
564 | ||
d6e0175c CH |
565 | if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) { |
566 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" | |
567 | " big sectors %u exceeds fabric_max_sectors:" | |
568 | " %u\n", cdb[0], sectors, | |
569 | su_dev->se_dev_attrib.fabric_max_sectors); | |
570 | goto out_invalid_cdb_field; | |
571 | } | |
572 | if (sectors > su_dev->se_dev_attrib.hw_max_sectors) { | |
573 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" | |
574 | " big sectors %u exceeds backend hw_max_sectors:" | |
575 | " %u\n", cdb[0], sectors, | |
576 | su_dev->se_dev_attrib.hw_max_sectors); | |
577 | goto out_invalid_cdb_field; | |
578 | } | |
579 | ||
1fd032ee CH |
580 | end_lba = dev->transport->get_blocks(dev) + 1; |
581 | if (cmd->t_task_lba + sectors > end_lba) { | |
582 | pr_err("cmd exceeds last lba %llu " | |
583 | "(lba %llu, sectors %u)\n", | |
584 | end_lba, cmd->t_task_lba, sectors); | |
585 | goto out_invalid_cdb_field; | |
586 | } | |
587 | ||
588 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
589 | } |
590 | ||
1fd032ee CH |
591 | ret = target_cmd_size_check(cmd, size); |
592 | if (ret < 0) | |
593 | return ret; | |
594 | ||
d6e0175c CH |
595 | return 0; |
596 | ||
597 | out_unsupported_cdb: | |
598 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
599 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
600 | return -EINVAL; | |
601 | out_invalid_cdb_field: | |
602 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
603 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
604 | return -EINVAL; | |
605 | } | |
606 | EXPORT_SYMBOL(sbc_parse_cdb); |