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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; | |
43 | unsigned char *buf; | |
44 | unsigned long long blocks_long = dev->transport->get_blocks(dev); | |
45 | u32 blocks; | |
46 | ||
47 | if (blocks_long >= 0x00000000ffffffff) | |
48 | blocks = 0xffffffff; | |
49 | else | |
50 | blocks = (u32)blocks_long; | |
51 | ||
52 | buf = transport_kmap_data_sg(cmd); | |
53 | ||
54 | buf[0] = (blocks >> 24) & 0xff; | |
55 | buf[1] = (blocks >> 16) & 0xff; | |
56 | buf[2] = (blocks >> 8) & 0xff; | |
57 | buf[3] = blocks & 0xff; | |
58 | buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; | |
59 | buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; | |
60 | buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; | |
61 | buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; | |
62 | ||
63 | transport_kunmap_data_sg(cmd); | |
64 | ||
65 | target_complete_cmd(cmd, GOOD); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
70 | { | |
71 | struct se_device *dev = cmd->se_dev; | |
72 | unsigned char *buf; | |
73 | unsigned long long blocks = dev->transport->get_blocks(dev); | |
74 | ||
75 | buf = transport_kmap_data_sg(cmd); | |
76 | ||
77 | buf[0] = (blocks >> 56) & 0xff; | |
78 | buf[1] = (blocks >> 48) & 0xff; | |
79 | buf[2] = (blocks >> 40) & 0xff; | |
80 | buf[3] = (blocks >> 32) & 0xff; | |
81 | buf[4] = (blocks >> 24) & 0xff; | |
82 | buf[5] = (blocks >> 16) & 0xff; | |
83 | buf[6] = (blocks >> 8) & 0xff; | |
84 | buf[7] = blocks & 0xff; | |
85 | buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; | |
86 | buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; | |
87 | buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; | |
88 | buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; | |
89 | /* | |
90 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
91 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
92 | */ | |
93 | if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) | |
94 | buf[14] = 0x80; | |
95 | ||
96 | transport_kunmap_data_sg(cmd); | |
97 | ||
98 | target_complete_cmd(cmd, GOOD); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. | |
104 | * Note this is not used for TCM/pSCSI passthrough | |
105 | */ | |
106 | static int sbc_emulate_unmap(struct se_cmd *cmd) | |
107 | { | |
108 | struct se_device *dev = cmd->se_dev; | |
109 | unsigned char *buf, *ptr = NULL; | |
110 | unsigned char *cdb = &cmd->t_task_cdb[0]; | |
111 | sector_t lba; | |
112 | unsigned int size = cmd->data_length, range; | |
113 | int ret = 0, offset; | |
114 | unsigned short dl, bd_dl; | |
115 | ||
116 | if (!dev->transport->do_discard) { | |
117 | pr_err("UNMAP emulation not supported for: %s\n", | |
118 | dev->transport->name); | |
119 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
120 | return -ENOSYS; | |
121 | } | |
122 | ||
123 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
124 | offset = 8; | |
125 | size -= 8; | |
126 | dl = get_unaligned_be16(&cdb[0]); | |
127 | bd_dl = get_unaligned_be16(&cdb[2]); | |
128 | ||
129 | buf = transport_kmap_data_sg(cmd); | |
130 | ||
131 | ptr = &buf[offset]; | |
132 | pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu" | |
133 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
134 | ||
135 | while (size) { | |
136 | lba = get_unaligned_be64(&ptr[0]); | |
137 | range = get_unaligned_be32(&ptr[8]); | |
138 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
139 | (unsigned long long)lba, range); | |
140 | ||
141 | ret = dev->transport->do_discard(dev, lba, range); | |
142 | if (ret < 0) { | |
143 | pr_err("blkdev_issue_discard() failed: %d\n", | |
144 | ret); | |
145 | goto err; | |
146 | } | |
147 | ||
148 | ptr += 16; | |
149 | size -= 16; | |
150 | } | |
151 | ||
152 | err: | |
153 | transport_kunmap_data_sg(cmd); | |
154 | if (!ret) | |
155 | target_complete_cmd(cmd, GOOD); | |
156 | return ret; | |
157 | } | |
158 | ||
159 | /* | |
160 | * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. | |
161 | * Note this is not used for TCM/pSCSI passthrough | |
162 | */ | |
163 | static int sbc_emulate_write_same(struct se_cmd *cmd) | |
164 | { | |
165 | struct se_device *dev = cmd->se_dev; | |
166 | sector_t range; | |
167 | sector_t lba = cmd->t_task_lba; | |
168 | u32 num_blocks; | |
169 | int ret; | |
170 | ||
171 | if (!dev->transport->do_discard) { | |
172 | pr_err("WRITE_SAME emulation not supported" | |
173 | " for: %s\n", dev->transport->name); | |
174 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
175 | return -ENOSYS; | |
176 | } | |
177 | ||
178 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
179 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
180 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
181 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
182 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
183 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
184 | ||
185 | /* | |
186 | * Use the explicit range when non zero is supplied, otherwise calculate | |
187 | * the remaining range based on ->get_blocks() - starting LBA. | |
188 | */ | |
189 | if (num_blocks != 0) | |
190 | range = num_blocks; | |
191 | else | |
192 | range = (dev->transport->get_blocks(dev) - lba) + 1; | |
193 | ||
194 | pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n", | |
195 | (unsigned long long)lba, (unsigned long long)range); | |
196 | ||
197 | ret = dev->transport->do_discard(dev, lba, range); | |
198 | if (ret < 0) { | |
199 | pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n"); | |
200 | return ret; | |
201 | } | |
202 | ||
203 | target_complete_cmd(cmd, GOOD); | |
204 | return 0; | |
205 | } | |
206 | ||
1fd032ee CH |
207 | static int sbc_emulate_verify(struct se_cmd *cmd) |
208 | { | |
209 | target_complete_cmd(cmd, GOOD); | |
210 | return 0; | |
211 | } | |
212 | ||
d6e0175c CH |
213 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
214 | { | |
215 | return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors; | |
216 | } | |
217 | ||
218 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
219 | { | |
220 | struct se_device *dev = cmd->se_dev; | |
221 | unsigned long long end_lba; | |
222 | u32 sectors; | |
223 | ||
224 | sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size; | |
225 | end_lba = dev->transport->get_blocks(dev) + 1; | |
226 | ||
227 | if (cmd->t_task_lba + sectors > end_lba) { | |
228 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
229 | cmd->t_task_lba, sectors, end_lba); | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
237 | { | |
238 | /* | |
239 | * Use 8-bit sector value. SBC-3 says: | |
240 | * | |
241 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
242 | * logical blocks shall be written. Any other value | |
243 | * specifies the number of logical blocks that shall be | |
244 | * written. | |
245 | */ | |
246 | return cdb[4] ? : 256; | |
247 | } | |
248 | ||
249 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
250 | { | |
251 | return (u32)(cdb[7] << 8) + cdb[8]; | |
252 | } | |
253 | ||
254 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
255 | { | |
256 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
257 | } | |
258 | ||
259 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
260 | { | |
261 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
262 | (cdb[12] << 8) + cdb[13]; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
267 | */ | |
268 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
269 | { | |
270 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
271 | (cdb[30] << 8) + cdb[31]; | |
272 | ||
273 | } | |
274 | ||
275 | static inline u32 transport_lba_21(unsigned char *cdb) | |
276 | { | |
277 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
278 | } | |
279 | ||
280 | static inline u32 transport_lba_32(unsigned char *cdb) | |
281 | { | |
282 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
283 | } | |
284 | ||
285 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
286 | { | |
287 | unsigned int __v1, __v2; | |
288 | ||
289 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
290 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
291 | ||
292 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
293 | } | |
294 | ||
295 | /* | |
296 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
297 | */ | |
298 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
299 | { | |
300 | unsigned int __v1, __v2; | |
301 | ||
302 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
303 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
304 | ||
305 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
306 | } | |
307 | ||
308 | static int sbc_write_same_supported(struct se_device *dev, | |
309 | unsigned char *flags) | |
310 | { | |
311 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { | |
312 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
313 | " bits not supported for Block Discard" | |
314 | " Emulation\n"); | |
315 | return -ENOSYS; | |
316 | } | |
317 | ||
318 | /* | |
319 | * Currently for the emulated case we only accept | |
320 | * tpws with the UNMAP=1 bit set. | |
321 | */ | |
322 | if (!(flags[0] & 0x08)) { | |
323 | pr_err("WRITE_SAME w/o UNMAP bit not" | |
324 | " supported for Block Discard Emulation\n"); | |
325 | return -ENOSYS; | |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static void xdreadwrite_callback(struct se_cmd *cmd) | |
332 | { | |
333 | unsigned char *buf, *addr; | |
334 | struct scatterlist *sg; | |
335 | unsigned int offset; | |
336 | int i; | |
337 | int count; | |
338 | /* | |
339 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
340 | * | |
341 | * 1) read the specified logical block(s); | |
342 | * 2) transfer logical blocks from the data-out buffer; | |
343 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
344 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
345 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
346 | * blocks transferred from the data-out buffer; and | |
347 | * 5) transfer the resulting XOR data to the data-in buffer. | |
348 | */ | |
349 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
350 | if (!buf) { | |
351 | pr_err("Unable to allocate xor_callback buf\n"); | |
352 | return; | |
353 | } | |
354 | /* | |
355 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
356 | * into the locally allocated *buf | |
357 | */ | |
358 | sg_copy_to_buffer(cmd->t_data_sg, | |
359 | cmd->t_data_nents, | |
360 | buf, | |
361 | cmd->data_length); | |
362 | ||
363 | /* | |
364 | * Now perform the XOR against the BIDI read memory located at | |
365 | * cmd->t_mem_bidi_list | |
366 | */ | |
367 | ||
368 | offset = 0; | |
369 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
370 | addr = kmap_atomic(sg_page(sg)); | |
371 | if (!addr) | |
372 | goto out; | |
373 | ||
374 | for (i = 0; i < sg->length; i++) | |
375 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
376 | ||
377 | offset += sg->length; | |
378 | kunmap_atomic(addr); | |
379 | } | |
380 | ||
381 | out: | |
382 | kfree(buf); | |
383 | } | |
384 | ||
0c2ad7d1 | 385 | int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops) |
d6e0175c CH |
386 | { |
387 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; | |
388 | struct se_device *dev = cmd->se_dev; | |
389 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 390 | unsigned int size; |
d6e0175c CH |
391 | u32 sectors = 0; |
392 | int ret; | |
393 | ||
394 | switch (cdb[0]) { | |
395 | case READ_6: | |
396 | sectors = transport_get_sectors_6(cdb); | |
397 | cmd->t_task_lba = transport_lba_21(cdb); | |
398 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 399 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
400 | break; |
401 | case READ_10: | |
402 | sectors = transport_get_sectors_10(cdb); | |
403 | cmd->t_task_lba = transport_lba_32(cdb); | |
404 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 405 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
406 | break; |
407 | case READ_12: | |
408 | sectors = transport_get_sectors_12(cdb); | |
409 | cmd->t_task_lba = transport_lba_32(cdb); | |
410 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 411 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
412 | break; |
413 | case READ_16: | |
414 | sectors = transport_get_sectors_16(cdb); | |
415 | cmd->t_task_lba = transport_lba_64(cdb); | |
416 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 417 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
418 | break; |
419 | case WRITE_6: | |
420 | sectors = transport_get_sectors_6(cdb); | |
421 | cmd->t_task_lba = transport_lba_21(cdb); | |
422 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 423 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
424 | break; |
425 | case WRITE_10: | |
426 | case WRITE_VERIFY: | |
427 | sectors = transport_get_sectors_10(cdb); | |
428 | cmd->t_task_lba = transport_lba_32(cdb); | |
429 | if (cdb[1] & 0x8) | |
430 | cmd->se_cmd_flags |= SCF_FUA; | |
431 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 432 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
433 | break; |
434 | case WRITE_12: | |
435 | sectors = transport_get_sectors_12(cdb); | |
436 | cmd->t_task_lba = transport_lba_32(cdb); | |
437 | if (cdb[1] & 0x8) | |
438 | cmd->se_cmd_flags |= SCF_FUA; | |
439 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 440 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
441 | break; |
442 | case WRITE_16: | |
443 | sectors = transport_get_sectors_16(cdb); | |
444 | cmd->t_task_lba = transport_lba_64(cdb); | |
445 | if (cdb[1] & 0x8) | |
446 | cmd->se_cmd_flags |= SCF_FUA; | |
447 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
0c2ad7d1 | 448 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
449 | break; |
450 | case XDWRITEREAD_10: | |
451 | if ((cmd->data_direction != DMA_TO_DEVICE) || | |
452 | !(cmd->se_cmd_flags & SCF_BIDI)) | |
453 | goto out_invalid_cdb_field; | |
454 | sectors = transport_get_sectors_10(cdb); | |
455 | ||
456 | cmd->t_task_lba = transport_lba_32(cdb); | |
457 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
458 | ||
459 | /* | |
460 | * Setup BIDI XOR callback to be run after I/O completion. | |
461 | */ | |
0c2ad7d1 | 462 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
463 | cmd->transport_complete_callback = &xdreadwrite_callback; |
464 | if (cdb[1] & 0x8) | |
465 | cmd->se_cmd_flags |= SCF_FUA; | |
466 | break; | |
467 | case VARIABLE_LENGTH_CMD: | |
468 | { | |
469 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
470 | switch (service_action) { | |
471 | case XDWRITEREAD_32: | |
472 | sectors = transport_get_sectors_32(cdb); | |
473 | ||
474 | /* | |
475 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
476 | * XDWRITE_READ_32 logic. | |
477 | */ | |
478 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
479 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
480 | ||
481 | /* | |
482 | * Setup BIDI XOR callback to be run during after I/O | |
483 | * completion. | |
484 | */ | |
0c2ad7d1 | 485 | cmd->execute_cmd = ops->execute_rw; |
d6e0175c CH |
486 | cmd->transport_complete_callback = &xdreadwrite_callback; |
487 | if (cdb[1] & 0x8) | |
488 | cmd->se_cmd_flags |= SCF_FUA; | |
489 | break; | |
490 | case WRITE_SAME_32: | |
491 | sectors = transport_get_sectors_32(cdb); | |
492 | if (!sectors) { | |
493 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
494 | " supported\n"); | |
495 | goto out_invalid_cdb_field; | |
496 | } | |
497 | ||
1fd032ee | 498 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
499 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
500 | ||
501 | if (sbc_write_same_supported(dev, &cdb[10]) < 0) | |
502 | goto out_unsupported_cdb; | |
1fd032ee | 503 | cmd->execute_cmd = sbc_emulate_write_same; |
d6e0175c CH |
504 | break; |
505 | default: | |
506 | pr_err("VARIABLE_LENGTH_CMD service action" | |
507 | " 0x%04x not supported\n", service_action); | |
508 | goto out_unsupported_cdb; | |
509 | } | |
510 | break; | |
511 | } | |
512 | case READ_CAPACITY: | |
1fd032ee CH |
513 | size = READ_CAP_LEN; |
514 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
515 | break; |
516 | case SERVICE_ACTION_IN: | |
517 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
518 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 519 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c CH |
520 | break; |
521 | default: | |
522 | pr_err("Unsupported SA: 0x%02x\n", | |
523 | cmd->t_task_cdb[1] & 0x1f); | |
524 | goto out_invalid_cdb_field; | |
525 | } | |
1fd032ee | 526 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
527 | (cdb[12] << 8) | cdb[13]; |
528 | break; | |
529 | case SYNCHRONIZE_CACHE: | |
530 | case SYNCHRONIZE_CACHE_16: | |
ad67f0d9 CH |
531 | if (!ops->execute_sync_cache) |
532 | goto out_unsupported_cdb; | |
533 | ||
d6e0175c CH |
534 | /* |
535 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
536 | */ | |
537 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
538 | sectors = transport_get_sectors_10(cdb); | |
539 | cmd->t_task_lba = transport_lba_32(cdb); | |
540 | } else { | |
541 | sectors = transport_get_sectors_16(cdb); | |
542 | cmd->t_task_lba = transport_lba_64(cdb); | |
543 | } | |
544 | ||
1fd032ee | 545 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
546 | |
547 | /* | |
548 | * Check to ensure that LBA + Range does not exceed past end of | |
549 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
550 | */ | |
551 | if (cmd->t_task_lba || sectors) { | |
552 | if (sbc_check_valid_sectors(cmd) < 0) | |
553 | goto out_invalid_cdb_field; | |
554 | } | |
ad67f0d9 | 555 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
556 | break; |
557 | case UNMAP: | |
1fd032ee CH |
558 | size = get_unaligned_be16(&cdb[7]); |
559 | cmd->execute_cmd = sbc_emulate_unmap; | |
d6e0175c CH |
560 | break; |
561 | case WRITE_SAME_16: | |
562 | sectors = transport_get_sectors_16(cdb); | |
563 | if (!sectors) { | |
564 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
565 | goto out_invalid_cdb_field; | |
566 | } | |
567 | ||
1fd032ee | 568 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
569 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
570 | ||
571 | if (sbc_write_same_supported(dev, &cdb[1]) < 0) | |
572 | goto out_unsupported_cdb; | |
1fd032ee | 573 | cmd->execute_cmd = sbc_emulate_write_same; |
d6e0175c CH |
574 | break; |
575 | case WRITE_SAME: | |
576 | sectors = transport_get_sectors_10(cdb); | |
577 | if (!sectors) { | |
578 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
579 | goto out_invalid_cdb_field; | |
580 | } | |
581 | ||
1fd032ee | 582 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
583 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
584 | ||
585 | /* | |
586 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
587 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
588 | */ | |
589 | if (sbc_write_same_supported(dev, &cdb[1]) < 0) | |
590 | goto out_unsupported_cdb; | |
1fd032ee | 591 | cmd->execute_cmd = sbc_emulate_write_same; |
d6e0175c CH |
592 | break; |
593 | case VERIFY: | |
1fd032ee CH |
594 | size = 0; |
595 | cmd->execute_cmd = sbc_emulate_verify; | |
d6e0175c CH |
596 | break; |
597 | default: | |
1fd032ee | 598 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
599 | if (ret) |
600 | return ret; | |
601 | } | |
602 | ||
603 | /* reject any command that we don't have a handler for */ | |
604 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
605 | goto out_unsupported_cdb; | |
606 | ||
607 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
608 | unsigned long long end_lba; |
609 | ||
d6e0175c CH |
610 | if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) { |
611 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" | |
612 | " big sectors %u exceeds fabric_max_sectors:" | |
613 | " %u\n", cdb[0], sectors, | |
614 | su_dev->se_dev_attrib.fabric_max_sectors); | |
615 | goto out_invalid_cdb_field; | |
616 | } | |
617 | if (sectors > su_dev->se_dev_attrib.hw_max_sectors) { | |
618 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" | |
619 | " big sectors %u exceeds backend hw_max_sectors:" | |
620 | " %u\n", cdb[0], sectors, | |
621 | su_dev->se_dev_attrib.hw_max_sectors); | |
622 | goto out_invalid_cdb_field; | |
623 | } | |
624 | ||
1fd032ee CH |
625 | end_lba = dev->transport->get_blocks(dev) + 1; |
626 | if (cmd->t_task_lba + sectors > end_lba) { | |
627 | pr_err("cmd exceeds last lba %llu " | |
628 | "(lba %llu, sectors %u)\n", | |
629 | end_lba, cmd->t_task_lba, sectors); | |
630 | goto out_invalid_cdb_field; | |
631 | } | |
632 | ||
633 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
634 | } |
635 | ||
1fd032ee CH |
636 | ret = target_cmd_size_check(cmd, size); |
637 | if (ret < 0) | |
638 | return ret; | |
639 | ||
d6e0175c CH |
640 | return 0; |
641 | ||
642 | out_unsupported_cdb: | |
643 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
644 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | |
645 | return -EINVAL; | |
646 | out_invalid_cdb_field: | |
647 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
648 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; | |
649 | return -EINVAL; | |
650 | } | |
651 | EXPORT_SYMBOL(sbc_parse_cdb); |