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Commit | Line | Data |
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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 | ||
a6b0133c | 283 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
284 | { |
285 | unsigned char *buf, *addr; | |
286 | struct scatterlist *sg; | |
287 | unsigned int offset; | |
a6b0133c NB |
288 | sense_reason_t ret = TCM_NO_SENSE; |
289 | int i, count; | |
d6e0175c CH |
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"); | |
a6b0133c | 304 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
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)); | |
a6b0133c NB |
323 | if (!addr) { |
324 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 325 | goto out; |
a6b0133c | 326 | } |
d6e0175c CH |
327 | |
328 | for (i = 0; i < sg->length; i++) | |
329 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
330 | ||
331 | offset += sg->length; | |
332 | kunmap_atomic(addr); | |
333 | } | |
334 | ||
335 | out: | |
336 | kfree(buf); | |
a6b0133c | 337 | return ret; |
d6e0175c CH |
338 | } |
339 | ||
a82a9538 NB |
340 | static sense_reason_t |
341 | sbc_execute_rw(struct se_cmd *cmd) | |
342 | { | |
343 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
344 | cmd->data_direction); | |
345 | } | |
346 | ||
de103c93 CH |
347 | sense_reason_t |
348 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 349 | { |
d6e0175c CH |
350 | struct se_device *dev = cmd->se_dev; |
351 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 352 | unsigned int size; |
d6e0175c | 353 | u32 sectors = 0; |
de103c93 | 354 | sense_reason_t ret; |
d6e0175c CH |
355 | |
356 | switch (cdb[0]) { | |
357 | case READ_6: | |
358 | sectors = transport_get_sectors_6(cdb); | |
359 | cmd->t_task_lba = transport_lba_21(cdb); | |
360 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
361 | cmd->execute_rw = ops->execute_rw; |
362 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
363 | break; |
364 | case READ_10: | |
365 | sectors = transport_get_sectors_10(cdb); | |
366 | cmd->t_task_lba = transport_lba_32(cdb); | |
367 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
368 | cmd->execute_rw = ops->execute_rw; |
369 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
370 | break; |
371 | case READ_12: | |
372 | sectors = transport_get_sectors_12(cdb); | |
373 | cmd->t_task_lba = transport_lba_32(cdb); | |
374 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
375 | cmd->execute_rw = ops->execute_rw; |
376 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
377 | break; |
378 | case READ_16: | |
379 | sectors = transport_get_sectors_16(cdb); | |
380 | cmd->t_task_lba = transport_lba_64(cdb); | |
381 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
382 | cmd->execute_rw = ops->execute_rw; |
383 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
384 | break; |
385 | case WRITE_6: | |
386 | sectors = transport_get_sectors_6(cdb); | |
387 | cmd->t_task_lba = transport_lba_21(cdb); | |
388 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
389 | cmd->execute_rw = ops->execute_rw; |
390 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
391 | break; |
392 | case WRITE_10: | |
393 | case WRITE_VERIFY: | |
394 | sectors = transport_get_sectors_10(cdb); | |
395 | cmd->t_task_lba = transport_lba_32(cdb); | |
396 | if (cdb[1] & 0x8) | |
397 | cmd->se_cmd_flags |= SCF_FUA; | |
398 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
399 | cmd->execute_rw = ops->execute_rw; |
400 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
401 | break; |
402 | case WRITE_12: | |
403 | sectors = transport_get_sectors_12(cdb); | |
404 | cmd->t_task_lba = transport_lba_32(cdb); | |
405 | if (cdb[1] & 0x8) | |
406 | cmd->se_cmd_flags |= SCF_FUA; | |
407 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
408 | cmd->execute_rw = ops->execute_rw; |
409 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
410 | break; |
411 | case WRITE_16: | |
412 | sectors = transport_get_sectors_16(cdb); | |
413 | cmd->t_task_lba = transport_lba_64(cdb); | |
414 | if (cdb[1] & 0x8) | |
415 | cmd->se_cmd_flags |= SCF_FUA; | |
416 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
417 | cmd->execute_rw = ops->execute_rw; |
418 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
419 | break; |
420 | case XDWRITEREAD_10: | |
de103c93 | 421 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 422 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 423 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
424 | sectors = transport_get_sectors_10(cdb); |
425 | ||
426 | cmd->t_task_lba = transport_lba_32(cdb); | |
427 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
428 | ||
429 | /* | |
430 | * Setup BIDI XOR callback to be run after I/O completion. | |
431 | */ | |
a82a9538 NB |
432 | cmd->execute_rw = ops->execute_rw; |
433 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
434 | cmd->transport_complete_callback = &xdreadwrite_callback; |
435 | if (cdb[1] & 0x8) | |
436 | cmd->se_cmd_flags |= SCF_FUA; | |
437 | break; | |
438 | case VARIABLE_LENGTH_CMD: | |
439 | { | |
440 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
441 | switch (service_action) { | |
442 | case XDWRITEREAD_32: | |
443 | sectors = transport_get_sectors_32(cdb); | |
444 | ||
445 | /* | |
446 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
447 | * XDWRITE_READ_32 logic. | |
448 | */ | |
449 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
450 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
451 | ||
452 | /* | |
453 | * Setup BIDI XOR callback to be run during after I/O | |
454 | * completion. | |
455 | */ | |
a82a9538 NB |
456 | cmd->execute_rw = ops->execute_rw; |
457 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
458 | cmd->transport_complete_callback = &xdreadwrite_callback; |
459 | if (cdb[1] & 0x8) | |
460 | cmd->se_cmd_flags |= SCF_FUA; | |
461 | break; | |
462 | case WRITE_SAME_32: | |
463 | sectors = transport_get_sectors_32(cdb); | |
464 | if (!sectors) { | |
465 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
466 | " supported\n"); | |
de103c93 | 467 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
468 | } |
469 | ||
1fd032ee | 470 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
471 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
472 | ||
cd063bef | 473 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 474 | if (ret) |
cd063bef | 475 | return ret; |
d6e0175c CH |
476 | break; |
477 | default: | |
478 | pr_err("VARIABLE_LENGTH_CMD service action" | |
479 | " 0x%04x not supported\n", service_action); | |
de103c93 | 480 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
481 | } |
482 | break; | |
483 | } | |
484 | case READ_CAPACITY: | |
1fd032ee CH |
485 | size = READ_CAP_LEN; |
486 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
487 | break; |
488 | case SERVICE_ACTION_IN: | |
489 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
490 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 491 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c CH |
492 | break; |
493 | default: | |
494 | pr_err("Unsupported SA: 0x%02x\n", | |
495 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 496 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 497 | } |
1fd032ee | 498 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
499 | (cdb[12] << 8) | cdb[13]; |
500 | break; | |
501 | case SYNCHRONIZE_CACHE: | |
502 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
503 | if (!ops->execute_sync_cache) { |
504 | size = 0; | |
505 | cmd->execute_cmd = sbc_emulate_noop; | |
506 | break; | |
507 | } | |
ad67f0d9 | 508 | |
d6e0175c CH |
509 | /* |
510 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
511 | */ | |
512 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
513 | sectors = transport_get_sectors_10(cdb); | |
514 | cmd->t_task_lba = transport_lba_32(cdb); | |
515 | } else { | |
516 | sectors = transport_get_sectors_16(cdb); | |
517 | cmd->t_task_lba = transport_lba_64(cdb); | |
518 | } | |
519 | ||
1fd032ee | 520 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
521 | |
522 | /* | |
523 | * Check to ensure that LBA + Range does not exceed past end of | |
524 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
525 | */ | |
526 | if (cmd->t_task_lba || sectors) { | |
527 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 528 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 529 | } |
ad67f0d9 | 530 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
531 | break; |
532 | case UNMAP: | |
14150a6b | 533 | if (!ops->execute_unmap) |
de103c93 | 534 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 535 | |
1fd032ee | 536 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 537 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
538 | break; |
539 | case WRITE_SAME_16: | |
540 | sectors = transport_get_sectors_16(cdb); | |
541 | if (!sectors) { | |
542 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 543 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
544 | } |
545 | ||
1fd032ee | 546 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
547 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
548 | ||
cd063bef | 549 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 550 | if (ret) |
cd063bef | 551 | return ret; |
d6e0175c CH |
552 | break; |
553 | case WRITE_SAME: | |
554 | sectors = transport_get_sectors_10(cdb); | |
555 | if (!sectors) { | |
556 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 557 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
558 | } |
559 | ||
1fd032ee | 560 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
561 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
562 | ||
563 | /* | |
564 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
565 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
566 | */ | |
cd063bef | 567 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 568 | if (ret) |
cd063bef | 569 | return ret; |
d6e0175c CH |
570 | break; |
571 | case VERIFY: | |
1fd032ee | 572 | size = 0; |
1920ed61 | 573 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 574 | break; |
1a1ff38c BK |
575 | case REZERO_UNIT: |
576 | case SEEK_6: | |
577 | case SEEK_10: | |
578 | /* | |
579 | * There are still clients out there which use these old SCSI-2 | |
580 | * commands. This mainly happens when running VMs with legacy | |
581 | * guest systems, connected via SCSI command pass-through to | |
582 | * iSCSI targets. Make them happy and return status GOOD. | |
583 | */ | |
584 | size = 0; | |
585 | cmd->execute_cmd = sbc_emulate_noop; | |
586 | break; | |
d6e0175c | 587 | default: |
1fd032ee | 588 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
589 | if (ret) |
590 | return ret; | |
591 | } | |
592 | ||
593 | /* reject any command that we don't have a handler for */ | |
594 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 595 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
596 | |
597 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
598 | unsigned long long end_lba; |
599 | ||
0fd97ccf | 600 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
601 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
602 | " big sectors %u exceeds fabric_max_sectors:" | |
603 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 604 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 605 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 606 | } |
0fd97ccf | 607 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
608 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
609 | " big sectors %u exceeds backend hw_max_sectors:" | |
610 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 611 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 612 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
613 | } |
614 | ||
1fd032ee CH |
615 | end_lba = dev->transport->get_blocks(dev) + 1; |
616 | if (cmd->t_task_lba + sectors > end_lba) { | |
617 | pr_err("cmd exceeds last lba %llu " | |
618 | "(lba %llu, sectors %u)\n", | |
619 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 620 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
621 | } |
622 | ||
623 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
624 | } |
625 | ||
de103c93 | 626 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
627 | } |
628 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 629 | |
6f23ac8a CH |
630 | u32 sbc_get_device_type(struct se_device *dev) |
631 | { | |
632 | return TYPE_DISK; | |
633 | } | |
634 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
635 | |
636 | sense_reason_t | |
637 | sbc_execute_unmap(struct se_cmd *cmd, | |
638 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
639 | sector_t, sector_t), | |
640 | void *priv) | |
641 | { | |
642 | struct se_device *dev = cmd->se_dev; | |
643 | unsigned char *buf, *ptr = NULL; | |
644 | sector_t lba; | |
645 | int size; | |
646 | u32 range; | |
647 | sense_reason_t ret = 0; | |
648 | int dl, bd_dl; | |
649 | ||
650 | /* We never set ANC_SUP */ | |
651 | if (cmd->t_task_cdb[1]) | |
652 | return TCM_INVALID_CDB_FIELD; | |
653 | ||
654 | if (cmd->data_length == 0) { | |
655 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
656 | return 0; | |
657 | } | |
658 | ||
659 | if (cmd->data_length < 8) { | |
660 | pr_warn("UNMAP parameter list length %u too small\n", | |
661 | cmd->data_length); | |
662 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
663 | } | |
664 | ||
665 | buf = transport_kmap_data_sg(cmd); | |
666 | if (!buf) | |
667 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
668 | ||
669 | dl = get_unaligned_be16(&buf[0]); | |
670 | bd_dl = get_unaligned_be16(&buf[2]); | |
671 | ||
672 | size = cmd->data_length - 8; | |
673 | if (bd_dl > size) | |
674 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
675 | cmd->data_length, bd_dl); | |
676 | else | |
677 | size = bd_dl; | |
678 | ||
679 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
680 | ret = TCM_INVALID_PARAMETER_LIST; | |
681 | goto err; | |
682 | } | |
683 | ||
684 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
685 | ptr = &buf[8]; | |
686 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
687 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
688 | ||
689 | while (size >= 16) { | |
690 | lba = get_unaligned_be64(&ptr[0]); | |
691 | range = get_unaligned_be32(&ptr[8]); | |
692 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
693 | (unsigned long long)lba, range); | |
694 | ||
695 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
696 | ret = TCM_INVALID_PARAMETER_LIST; | |
697 | goto err; | |
698 | } | |
699 | ||
700 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
701 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
702 | goto err; | |
703 | } | |
704 | ||
705 | ret = do_unmap_fn(cmd, priv, lba, range); | |
706 | if (ret) | |
707 | goto err; | |
708 | ||
709 | ptr += 16; | |
710 | size -= 16; | |
711 | } | |
712 | ||
713 | err: | |
714 | transport_kunmap_data_sg(cmd); | |
715 | if (!ret) | |
716 | target_complete_cmd(cmd, GOOD); | |
717 | return ret; | |
718 | } | |
719 | EXPORT_SYMBOL(sbc_execute_unmap); |