Commit | Line | Data |
---|---|---|
d6e0175c CH |
1 | /* |
2 | * SCSI Block Commands (SBC) parsing and emulation. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
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> | |
68ff9b9b | 28 | #include <scsi/scsi_tcq.h> |
d6e0175c CH |
29 | |
30 | #include <target/target_core_base.h> | |
31 | #include <target/target_core_backend.h> | |
32 | #include <target/target_core_fabric.h> | |
33 | ||
34 | #include "target_core_internal.h" | |
35 | #include "target_core_ua.h" | |
c66094bf | 36 | #include "target_core_alua.h" |
d6e0175c | 37 | |
de103c93 CH |
38 | static sense_reason_t |
39 | sbc_emulate_readcapacity(struct se_cmd *cmd) | |
1fd032ee CH |
40 | { |
41 | struct se_device *dev = cmd->se_dev; | |
8dc8632a | 42 | unsigned char *cdb = cmd->t_task_cdb; |
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 | ||
8dc8632a RD |
48 | /* |
49 | * SBC-2 says: | |
50 | * If the PMI bit is set to zero and the LOGICAL BLOCK | |
51 | * ADDRESS field is not set to zero, the device server shall | |
52 | * terminate the command with CHECK CONDITION status with | |
53 | * the sense key set to ILLEGAL REQUEST and the additional | |
54 | * sense code set to INVALID FIELD IN CDB. | |
55 | * | |
56 | * In SBC-3, these fields are obsolete, but some SCSI | |
57 | * compliance tests actually check this, so we might as well | |
58 | * follow SBC-2. | |
59 | */ | |
60 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) | |
61 | return TCM_INVALID_CDB_FIELD; | |
62 | ||
1fd032ee CH |
63 | if (blocks_long >= 0x00000000ffffffff) |
64 | blocks = 0xffffffff; | |
65 | else | |
66 | blocks = (u32)blocks_long; | |
67 | ||
1fd032ee CH |
68 | buf[0] = (blocks >> 24) & 0xff; |
69 | buf[1] = (blocks >> 16) & 0xff; | |
70 | buf[2] = (blocks >> 8) & 0xff; | |
71 | buf[3] = blocks & 0xff; | |
0fd97ccf CH |
72 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
73 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
74 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
75 | buf[7] = dev->dev_attrib.block_size & 0xff; | |
1fd032ee | 76 | |
a50da144 | 77 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
78 | if (rbuf) { |
79 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
80 | transport_kunmap_data_sg(cmd); | |
81 | } | |
1fd032ee CH |
82 | |
83 | target_complete_cmd(cmd, GOOD); | |
84 | return 0; | |
85 | } | |
86 | ||
de103c93 CH |
87 | static sense_reason_t |
88 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) | |
1fd032ee CH |
89 | { |
90 | struct se_device *dev = cmd->se_dev; | |
a50da144 PB |
91 | unsigned char *rbuf; |
92 | unsigned char buf[32]; | |
1fd032ee CH |
93 | unsigned long long blocks = dev->transport->get_blocks(dev); |
94 | ||
a50da144 | 95 | memset(buf, 0, sizeof(buf)); |
1fd032ee CH |
96 | buf[0] = (blocks >> 56) & 0xff; |
97 | buf[1] = (blocks >> 48) & 0xff; | |
98 | buf[2] = (blocks >> 40) & 0xff; | |
99 | buf[3] = (blocks >> 32) & 0xff; | |
100 | buf[4] = (blocks >> 24) & 0xff; | |
101 | buf[5] = (blocks >> 16) & 0xff; | |
102 | buf[6] = (blocks >> 8) & 0xff; | |
103 | buf[7] = blocks & 0xff; | |
0fd97ccf CH |
104 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
105 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; | |
106 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; | |
107 | buf[11] = dev->dev_attrib.block_size & 0xff; | |
7f7caf6a AG |
108 | |
109 | if (dev->transport->get_lbppbe) | |
110 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; | |
111 | ||
112 | if (dev->transport->get_alignment_offset_lbas) { | |
113 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); | |
114 | buf[14] = (lalba >> 8) & 0x3f; | |
115 | buf[15] = lalba & 0xff; | |
116 | } | |
117 | ||
1fd032ee CH |
118 | /* |
119 | * Set Thin Provisioning Enable bit following sbc3r22 in section | |
120 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. | |
121 | */ | |
0fd97ccf | 122 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
7f7caf6a | 123 | buf[14] |= 0x80; |
1fd032ee | 124 | |
a50da144 | 125 | rbuf = transport_kmap_data_sg(cmd); |
8b4b0dcb NB |
126 | if (rbuf) { |
127 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); | |
128 | transport_kunmap_data_sg(cmd); | |
129 | } | |
1fd032ee CH |
130 | |
131 | target_complete_cmd(cmd, GOOD); | |
132 | return 0; | |
133 | } | |
134 | ||
972b29c8 | 135 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
1fd032ee | 136 | { |
1fd032ee | 137 | u32 num_blocks; |
1fd032ee CH |
138 | |
139 | if (cmd->t_task_cdb[0] == WRITE_SAME) | |
140 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); | |
141 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) | |
142 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); | |
143 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ | |
144 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); | |
145 | ||
146 | /* | |
147 | * Use the explicit range when non zero is supplied, otherwise calculate | |
148 | * the remaining range based on ->get_blocks() - starting LBA. | |
149 | */ | |
6f974e8c CH |
150 | if (num_blocks) |
151 | return num_blocks; | |
1fd032ee | 152 | |
6f974e8c CH |
153 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
154 | cmd->t_task_lba + 1; | |
1fd032ee | 155 | } |
972b29c8 | 156 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
1fd032ee | 157 | |
de103c93 | 158 | static sense_reason_t |
1920ed61 | 159 | sbc_emulate_noop(struct se_cmd *cmd) |
1a1ff38c BK |
160 | { |
161 | target_complete_cmd(cmd, GOOD); | |
162 | return 0; | |
163 | } | |
164 | ||
d6e0175c CH |
165 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
166 | { | |
0fd97ccf | 167 | return cmd->se_dev->dev_attrib.block_size * sectors; |
d6e0175c CH |
168 | } |
169 | ||
170 | static int sbc_check_valid_sectors(struct se_cmd *cmd) | |
171 | { | |
172 | struct se_device *dev = cmd->se_dev; | |
173 | unsigned long long end_lba; | |
174 | u32 sectors; | |
175 | ||
0fd97ccf | 176 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
d6e0175c CH |
177 | end_lba = dev->transport->get_blocks(dev) + 1; |
178 | ||
179 | if (cmd->t_task_lba + sectors > end_lba) { | |
180 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", | |
181 | cmd->t_task_lba, sectors, end_lba); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static inline u32 transport_get_sectors_6(unsigned char *cdb) | |
189 | { | |
190 | /* | |
191 | * Use 8-bit sector value. SBC-3 says: | |
192 | * | |
193 | * A TRANSFER LENGTH field set to zero specifies that 256 | |
194 | * logical blocks shall be written. Any other value | |
195 | * specifies the number of logical blocks that shall be | |
196 | * written. | |
197 | */ | |
198 | return cdb[4] ? : 256; | |
199 | } | |
200 | ||
201 | static inline u32 transport_get_sectors_10(unsigned char *cdb) | |
202 | { | |
203 | return (u32)(cdb[7] << 8) + cdb[8]; | |
204 | } | |
205 | ||
206 | static inline u32 transport_get_sectors_12(unsigned char *cdb) | |
207 | { | |
208 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; | |
209 | } | |
210 | ||
211 | static inline u32 transport_get_sectors_16(unsigned char *cdb) | |
212 | { | |
213 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + | |
214 | (cdb[12] << 8) + cdb[13]; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants | |
219 | */ | |
220 | static inline u32 transport_get_sectors_32(unsigned char *cdb) | |
221 | { | |
222 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + | |
223 | (cdb[30] << 8) + cdb[31]; | |
224 | ||
225 | } | |
226 | ||
227 | static inline u32 transport_lba_21(unsigned char *cdb) | |
228 | { | |
229 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; | |
230 | } | |
231 | ||
232 | static inline u32 transport_lba_32(unsigned char *cdb) | |
233 | { | |
234 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
235 | } | |
236 | ||
237 | static inline unsigned long long transport_lba_64(unsigned char *cdb) | |
238 | { | |
239 | unsigned int __v1, __v2; | |
240 | ||
241 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; | |
242 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | |
243 | ||
244 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
245 | } | |
246 | ||
247 | /* | |
248 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs | |
249 | */ | |
250 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) | |
251 | { | |
252 | unsigned int __v1, __v2; | |
253 | ||
254 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; | |
255 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; | |
256 | ||
257 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; | |
258 | } | |
259 | ||
cd063bef NB |
260 | static sense_reason_t |
261 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) | |
d6e0175c | 262 | { |
972b29c8 | 263 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
773cbaf7 | 264 | |
d6e0175c CH |
265 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
266 | pr_err("WRITE_SAME PBDATA and LBDATA" | |
267 | " bits not supported for Block Discard" | |
268 | " Emulation\n"); | |
cd063bef | 269 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c | 270 | } |
773cbaf7 NB |
271 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
272 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", | |
273 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); | |
274 | return TCM_INVALID_CDB_FIELD; | |
275 | } | |
5cb770bf RD |
276 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
277 | if (flags[0] & 0x10) { | |
278 | pr_warn("WRITE SAME with ANCHOR not supported\n"); | |
279 | return TCM_INVALID_CDB_FIELD; | |
280 | } | |
d6e0175c | 281 | /* |
cd063bef NB |
282 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
283 | * translated into block discard requests within backend code. | |
d6e0175c | 284 | */ |
cd063bef NB |
285 | if (flags[0] & 0x08) { |
286 | if (!ops->execute_write_same_unmap) | |
287 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
288 | ||
289 | cmd->execute_cmd = ops->execute_write_same_unmap; | |
290 | return 0; | |
d6e0175c | 291 | } |
cd063bef NB |
292 | if (!ops->execute_write_same) |
293 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
d6e0175c | 294 | |
cd063bef | 295 | cmd->execute_cmd = ops->execute_write_same; |
d6e0175c CH |
296 | return 0; |
297 | } | |
298 | ||
a6b0133c | 299 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
d6e0175c CH |
300 | { |
301 | unsigned char *buf, *addr; | |
302 | struct scatterlist *sg; | |
303 | unsigned int offset; | |
a6b0133c NB |
304 | sense_reason_t ret = TCM_NO_SENSE; |
305 | int i, count; | |
d6e0175c CH |
306 | /* |
307 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command | |
308 | * | |
309 | * 1) read the specified logical block(s); | |
310 | * 2) transfer logical blocks from the data-out buffer; | |
311 | * 3) XOR the logical blocks transferred from the data-out buffer with | |
312 | * the logical blocks read, storing the resulting XOR data in a buffer; | |
313 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical | |
314 | * blocks transferred from the data-out buffer; and | |
315 | * 5) transfer the resulting XOR data to the data-in buffer. | |
316 | */ | |
317 | buf = kmalloc(cmd->data_length, GFP_KERNEL); | |
318 | if (!buf) { | |
319 | pr_err("Unable to allocate xor_callback buf\n"); | |
a6b0133c | 320 | return TCM_OUT_OF_RESOURCES; |
d6e0175c CH |
321 | } |
322 | /* | |
323 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg | |
324 | * into the locally allocated *buf | |
325 | */ | |
326 | sg_copy_to_buffer(cmd->t_data_sg, | |
327 | cmd->t_data_nents, | |
328 | buf, | |
329 | cmd->data_length); | |
330 | ||
331 | /* | |
332 | * Now perform the XOR against the BIDI read memory located at | |
333 | * cmd->t_mem_bidi_list | |
334 | */ | |
335 | ||
336 | offset = 0; | |
337 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { | |
338 | addr = kmap_atomic(sg_page(sg)); | |
a6b0133c NB |
339 | if (!addr) { |
340 | ret = TCM_OUT_OF_RESOURCES; | |
d6e0175c | 341 | goto out; |
a6b0133c | 342 | } |
d6e0175c CH |
343 | |
344 | for (i = 0; i < sg->length; i++) | |
345 | *(addr + sg->offset + i) ^= *(buf + offset + i); | |
346 | ||
347 | offset += sg->length; | |
348 | kunmap_atomic(addr); | |
349 | } | |
350 | ||
351 | out: | |
352 | kfree(buf); | |
a6b0133c | 353 | return ret; |
d6e0175c CH |
354 | } |
355 | ||
a82a9538 NB |
356 | static sense_reason_t |
357 | sbc_execute_rw(struct se_cmd *cmd) | |
358 | { | |
359 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, | |
360 | cmd->data_direction); | |
361 | } | |
362 | ||
68ff9b9b NB |
363 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
364 | { | |
365 | struct se_device *dev = cmd->se_dev; | |
366 | ||
d8855c15 NB |
367 | /* |
368 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through | |
369 | * within target_complete_ok_work() if the command was successfully | |
370 | * sent to the backend driver. | |
371 | */ | |
372 | spin_lock_irq(&cmd->t_state_lock); | |
373 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) | |
374 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; | |
375 | spin_unlock_irq(&cmd->t_state_lock); | |
376 | ||
68ff9b9b NB |
377 | /* |
378 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() | |
379 | * before the original READ I/O submission. | |
380 | */ | |
381 | up(&dev->caw_sem); | |
382 | ||
383 | return TCM_NO_SENSE; | |
384 | } | |
385 | ||
386 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) | |
387 | { | |
388 | struct se_device *dev = cmd->se_dev; | |
389 | struct scatterlist *write_sg = NULL, *sg; | |
db60df88 | 390 | unsigned char *buf = NULL, *addr; |
68ff9b9b NB |
391 | struct sg_mapping_iter m; |
392 | unsigned int offset = 0, len; | |
393 | unsigned int nlbas = cmd->t_task_nolb; | |
394 | unsigned int block_size = dev->dev_attrib.block_size; | |
395 | unsigned int compare_len = (nlbas * block_size); | |
396 | sense_reason_t ret = TCM_NO_SENSE; | |
397 | int rc, i; | |
398 | ||
cf6d1f09 NB |
399 | /* |
400 | * Handle early failure in transport_generic_request_failure(), | |
401 | * which will not have taken ->caw_mutex yet.. | |
402 | */ | |
403 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) | |
404 | return TCM_NO_SENSE; | |
db60df88 NB |
405 | /* |
406 | * Immediately exit + release dev->caw_sem if command has already | |
407 | * been failed with a non-zero SCSI status. | |
408 | */ | |
409 | if (cmd->scsi_status) { | |
410 | pr_err("compare_and_write_callback: non zero scsi_status:" | |
411 | " 0x%02x\n", cmd->scsi_status); | |
412 | goto out; | |
413 | } | |
cf6d1f09 | 414 | |
68ff9b9b NB |
415 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
416 | if (!buf) { | |
417 | pr_err("Unable to allocate compare_and_write buf\n"); | |
a2890087 NB |
418 | ret = TCM_OUT_OF_RESOURCES; |
419 | goto out; | |
68ff9b9b NB |
420 | } |
421 | ||
422 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, | |
423 | GFP_KERNEL); | |
424 | if (!write_sg) { | |
425 | pr_err("Unable to allocate compare_and_write sg\n"); | |
426 | ret = TCM_OUT_OF_RESOURCES; | |
427 | goto out; | |
428 | } | |
429 | /* | |
430 | * Setup verify and write data payloads from total NumberLBAs. | |
431 | */ | |
432 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, | |
433 | cmd->data_length); | |
434 | if (!rc) { | |
435 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); | |
436 | ret = TCM_OUT_OF_RESOURCES; | |
437 | goto out; | |
438 | } | |
439 | /* | |
440 | * Compare against SCSI READ payload against verify payload | |
441 | */ | |
442 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { | |
443 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); | |
444 | if (!addr) { | |
445 | ret = TCM_OUT_OF_RESOURCES; | |
446 | goto out; | |
447 | } | |
448 | ||
449 | len = min(sg->length, compare_len); | |
450 | ||
451 | if (memcmp(addr, buf + offset, len)) { | |
452 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", | |
453 | addr, buf + offset); | |
454 | kunmap_atomic(addr); | |
455 | goto miscompare; | |
456 | } | |
457 | kunmap_atomic(addr); | |
458 | ||
459 | offset += len; | |
460 | compare_len -= len; | |
461 | if (!compare_len) | |
462 | break; | |
463 | } | |
464 | ||
465 | i = 0; | |
466 | len = cmd->t_task_nolb * block_size; | |
467 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); | |
468 | /* | |
469 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. | |
470 | */ | |
471 | while (len) { | |
472 | sg_miter_next(&m); | |
473 | ||
474 | if (block_size < PAGE_SIZE) { | |
475 | sg_set_page(&write_sg[i], m.page, block_size, | |
476 | block_size); | |
477 | } else { | |
478 | sg_miter_next(&m); | |
479 | sg_set_page(&write_sg[i], m.page, block_size, | |
480 | 0); | |
481 | } | |
482 | len -= block_size; | |
483 | i++; | |
484 | } | |
485 | sg_miter_stop(&m); | |
486 | /* | |
487 | * Save the original SGL + nents values before updating to new | |
488 | * assignments, to be released in transport_free_pages() -> | |
489 | * transport_reset_sgl_orig() | |
490 | */ | |
491 | cmd->t_data_sg_orig = cmd->t_data_sg; | |
492 | cmd->t_data_sg = write_sg; | |
493 | cmd->t_data_nents_orig = cmd->t_data_nents; | |
494 | cmd->t_data_nents = 1; | |
495 | ||
496 | cmd->sam_task_attr = MSG_HEAD_TAG; | |
497 | cmd->transport_complete_callback = compare_and_write_post; | |
498 | /* | |
499 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler | |
500 | * for submitting the adjusted SGL to write instance user-data. | |
501 | */ | |
502 | cmd->execute_cmd = sbc_execute_rw; | |
503 | ||
504 | spin_lock_irq(&cmd->t_state_lock); | |
505 | cmd->t_state = TRANSPORT_PROCESSING; | |
506 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; | |
507 | spin_unlock_irq(&cmd->t_state_lock); | |
508 | ||
509 | __target_execute_cmd(cmd); | |
510 | ||
511 | kfree(buf); | |
512 | return ret; | |
513 | ||
514 | miscompare: | |
515 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", | |
516 | dev->transport->name); | |
517 | ret = TCM_MISCOMPARE_VERIFY; | |
518 | out: | |
519 | /* | |
520 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in | |
521 | * sbc_compare_and_write() before the original READ I/O submission. | |
522 | */ | |
523 | up(&dev->caw_sem); | |
524 | kfree(write_sg); | |
525 | kfree(buf); | |
526 | return ret; | |
527 | } | |
528 | ||
529 | static sense_reason_t | |
530 | sbc_compare_and_write(struct se_cmd *cmd) | |
531 | { | |
532 | struct se_device *dev = cmd->se_dev; | |
533 | sense_reason_t ret; | |
534 | int rc; | |
535 | /* | |
536 | * Submit the READ first for COMPARE_AND_WRITE to perform the | |
537 | * comparision using SGLs at cmd->t_bidi_data_sg.. | |
538 | */ | |
539 | rc = down_interruptible(&dev->caw_sem); | |
540 | if ((rc != 0) || signal_pending(current)) { | |
541 | cmd->transport_complete_callback = NULL; | |
542 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
543 | } | |
b7191253 NB |
544 | /* |
545 | * Reset cmd->data_length to individual block_size in order to not | |
546 | * confuse backend drivers that depend on this value matching the | |
547 | * size of the I/O being submitted. | |
548 | */ | |
549 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; | |
68ff9b9b NB |
550 | |
551 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, | |
552 | DMA_FROM_DEVICE); | |
553 | if (ret) { | |
554 | cmd->transport_complete_callback = NULL; | |
555 | up(&dev->caw_sem); | |
556 | return ret; | |
557 | } | |
558 | /* | |
559 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() | |
560 | * upon MISCOMPARE, or in compare_and_write_done() upon completion | |
561 | * of WRITE instance user-data. | |
562 | */ | |
563 | return TCM_NO_SENSE; | |
564 | } | |
565 | ||
499bf77b NB |
566 | static bool |
567 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, | |
568 | u32 sectors) | |
569 | { | |
570 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) | |
571 | return true; | |
572 | ||
573 | switch (dev->dev_attrib.pi_prot_type) { | |
574 | case TARGET_DIF_TYPE3_PROT: | |
575 | if (!(cdb[1] & 0xe0)) | |
576 | return true; | |
577 | ||
578 | cmd->reftag_seed = 0xffffffff; | |
579 | break; | |
580 | case TARGET_DIF_TYPE2_PROT: | |
581 | if (cdb[1] & 0xe0) | |
582 | return false; | |
583 | ||
584 | cmd->reftag_seed = cmd->t_task_lba; | |
585 | break; | |
586 | case TARGET_DIF_TYPE1_PROT: | |
587 | if (!(cdb[1] & 0xe0)) | |
588 | return true; | |
589 | ||
590 | cmd->reftag_seed = cmd->t_task_lba; | |
591 | break; | |
592 | case TARGET_DIF_TYPE0_PROT: | |
593 | default: | |
594 | return true; | |
595 | } | |
596 | ||
597 | cmd->prot_type = dev->dev_attrib.pi_prot_type; | |
598 | cmd->prot_length = dev->prot_length * sectors; | |
599 | cmd->prot_handover = PROT_SEPERATED; | |
600 | ||
601 | return true; | |
602 | } | |
603 | ||
de103c93 CH |
604 | sense_reason_t |
605 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) | |
d6e0175c | 606 | { |
d6e0175c CH |
607 | struct se_device *dev = cmd->se_dev; |
608 | unsigned char *cdb = cmd->t_task_cdb; | |
1fd032ee | 609 | unsigned int size; |
d6e0175c | 610 | u32 sectors = 0; |
de103c93 | 611 | sense_reason_t ret; |
d6e0175c CH |
612 | |
613 | switch (cdb[0]) { | |
614 | case READ_6: | |
615 | sectors = transport_get_sectors_6(cdb); | |
616 | cmd->t_task_lba = transport_lba_21(cdb); | |
617 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
618 | cmd->execute_rw = ops->execute_rw; |
619 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
620 | break; |
621 | case READ_10: | |
622 | sectors = transport_get_sectors_10(cdb); | |
623 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
624 | |
625 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
626 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
627 | ||
d6e0175c | 628 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
629 | cmd->execute_rw = ops->execute_rw; |
630 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
631 | break; |
632 | case READ_12: | |
633 | sectors = transport_get_sectors_12(cdb); | |
634 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
635 | |
636 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
637 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
638 | ||
d6e0175c | 639 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
640 | cmd->execute_rw = ops->execute_rw; |
641 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
642 | break; |
643 | case READ_16: | |
644 | sectors = transport_get_sectors_16(cdb); | |
645 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b NB |
646 | |
647 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
648 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
649 | ||
d6e0175c | 650 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
a82a9538 NB |
651 | cmd->execute_rw = ops->execute_rw; |
652 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
653 | break; |
654 | case WRITE_6: | |
655 | sectors = transport_get_sectors_6(cdb); | |
656 | cmd->t_task_lba = transport_lba_21(cdb); | |
657 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
658 | cmd->execute_rw = ops->execute_rw; |
659 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
660 | break; |
661 | case WRITE_10: | |
662 | case WRITE_VERIFY: | |
663 | sectors = transport_get_sectors_10(cdb); | |
664 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
665 | |
666 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
667 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
668 | ||
d6e0175c CH |
669 | if (cdb[1] & 0x8) |
670 | cmd->se_cmd_flags |= SCF_FUA; | |
671 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
672 | cmd->execute_rw = ops->execute_rw; |
673 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
674 | break; |
675 | case WRITE_12: | |
676 | sectors = transport_get_sectors_12(cdb); | |
677 | cmd->t_task_lba = transport_lba_32(cdb); | |
499bf77b NB |
678 | |
679 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
680 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
681 | ||
d6e0175c CH |
682 | if (cdb[1] & 0x8) |
683 | cmd->se_cmd_flags |= SCF_FUA; | |
684 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
685 | cmd->execute_rw = ops->execute_rw; |
686 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
687 | break; |
688 | case WRITE_16: | |
689 | sectors = transport_get_sectors_16(cdb); | |
690 | cmd->t_task_lba = transport_lba_64(cdb); | |
499bf77b NB |
691 | |
692 | if (!sbc_check_prot(dev, cmd, cdb, sectors)) | |
693 | return TCM_UNSUPPORTED_SCSI_OPCODE; | |
694 | ||
d6e0175c CH |
695 | if (cdb[1] & 0x8) |
696 | cmd->se_cmd_flags |= SCF_FUA; | |
697 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
a82a9538 NB |
698 | cmd->execute_rw = ops->execute_rw; |
699 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
700 | break; |
701 | case XDWRITEREAD_10: | |
de103c93 | 702 | if (cmd->data_direction != DMA_TO_DEVICE || |
d6e0175c | 703 | !(cmd->se_cmd_flags & SCF_BIDI)) |
de103c93 | 704 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
705 | sectors = transport_get_sectors_10(cdb); |
706 | ||
707 | cmd->t_task_lba = transport_lba_32(cdb); | |
708 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
709 | ||
710 | /* | |
711 | * Setup BIDI XOR callback to be run after I/O completion. | |
712 | */ | |
a82a9538 NB |
713 | cmd->execute_rw = ops->execute_rw; |
714 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
715 | cmd->transport_complete_callback = &xdreadwrite_callback; |
716 | if (cdb[1] & 0x8) | |
717 | cmd->se_cmd_flags |= SCF_FUA; | |
718 | break; | |
719 | case VARIABLE_LENGTH_CMD: | |
720 | { | |
721 | u16 service_action = get_unaligned_be16(&cdb[8]); | |
722 | switch (service_action) { | |
723 | case XDWRITEREAD_32: | |
724 | sectors = transport_get_sectors_32(cdb); | |
725 | ||
726 | /* | |
727 | * Use WRITE_32 and READ_32 opcodes for the emulated | |
728 | * XDWRITE_READ_32 logic. | |
729 | */ | |
730 | cmd->t_task_lba = transport_lba_64_ext(cdb); | |
731 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; | |
732 | ||
733 | /* | |
734 | * Setup BIDI XOR callback to be run during after I/O | |
735 | * completion. | |
736 | */ | |
a82a9538 NB |
737 | cmd->execute_rw = ops->execute_rw; |
738 | cmd->execute_cmd = sbc_execute_rw; | |
d6e0175c CH |
739 | cmd->transport_complete_callback = &xdreadwrite_callback; |
740 | if (cdb[1] & 0x8) | |
741 | cmd->se_cmd_flags |= SCF_FUA; | |
742 | break; | |
743 | case WRITE_SAME_32: | |
744 | sectors = transport_get_sectors_32(cdb); | |
745 | if (!sectors) { | |
746 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" | |
747 | " supported\n"); | |
de103c93 | 748 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
749 | } |
750 | ||
1fd032ee | 751 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
752 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
753 | ||
cd063bef | 754 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
6b64e1fe | 755 | if (ret) |
cd063bef | 756 | return ret; |
d6e0175c CH |
757 | break; |
758 | default: | |
759 | pr_err("VARIABLE_LENGTH_CMD service action" | |
760 | " 0x%04x not supported\n", service_action); | |
de103c93 | 761 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
762 | } |
763 | break; | |
764 | } | |
68ff9b9b NB |
765 | case COMPARE_AND_WRITE: |
766 | sectors = cdb[13]; | |
767 | /* | |
768 | * Currently enforce COMPARE_AND_WRITE for a single sector | |
769 | */ | |
770 | if (sectors > 1) { | |
771 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" | |
772 | " than 1\n", sectors); | |
773 | return TCM_INVALID_CDB_FIELD; | |
774 | } | |
775 | /* | |
776 | * Double size because we have two buffers, note that | |
777 | * zero is not an error.. | |
778 | */ | |
779 | size = 2 * sbc_get_size(cmd, sectors); | |
780 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); | |
781 | cmd->t_task_nolb = sectors; | |
782 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; | |
783 | cmd->execute_rw = ops->execute_rw; | |
784 | cmd->execute_cmd = sbc_compare_and_write; | |
785 | cmd->transport_complete_callback = compare_and_write_callback; | |
786 | break; | |
d6e0175c | 787 | case READ_CAPACITY: |
1fd032ee CH |
788 | size = READ_CAP_LEN; |
789 | cmd->execute_cmd = sbc_emulate_readcapacity; | |
d6e0175c CH |
790 | break; |
791 | case SERVICE_ACTION_IN: | |
792 | switch (cmd->t_task_cdb[1] & 0x1f) { | |
793 | case SAI_READ_CAPACITY_16: | |
1fd032ee | 794 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
d6e0175c | 795 | break; |
c66094bf HR |
796 | case SAI_REPORT_REFERRALS: |
797 | cmd->execute_cmd = target_emulate_report_referrals; | |
798 | break; | |
d6e0175c CH |
799 | default: |
800 | pr_err("Unsupported SA: 0x%02x\n", | |
801 | cmd->t_task_cdb[1] & 0x1f); | |
de103c93 | 802 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 803 | } |
1fd032ee | 804 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
d6e0175c CH |
805 | (cdb[12] << 8) | cdb[13]; |
806 | break; | |
807 | case SYNCHRONIZE_CACHE: | |
808 | case SYNCHRONIZE_CACHE_16: | |
882e3f8e HR |
809 | if (!ops->execute_sync_cache) { |
810 | size = 0; | |
811 | cmd->execute_cmd = sbc_emulate_noop; | |
812 | break; | |
813 | } | |
ad67f0d9 | 814 | |
d6e0175c CH |
815 | /* |
816 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE | |
817 | */ | |
818 | if (cdb[0] == SYNCHRONIZE_CACHE) { | |
819 | sectors = transport_get_sectors_10(cdb); | |
820 | cmd->t_task_lba = transport_lba_32(cdb); | |
821 | } else { | |
822 | sectors = transport_get_sectors_16(cdb); | |
823 | cmd->t_task_lba = transport_lba_64(cdb); | |
824 | } | |
825 | ||
1fd032ee | 826 | size = sbc_get_size(cmd, sectors); |
d6e0175c CH |
827 | |
828 | /* | |
829 | * Check to ensure that LBA + Range does not exceed past end of | |
830 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls | |
831 | */ | |
832 | if (cmd->t_task_lba || sectors) { | |
833 | if (sbc_check_valid_sectors(cmd) < 0) | |
33633676 | 834 | return TCM_ADDRESS_OUT_OF_RANGE; |
d6e0175c | 835 | } |
ad67f0d9 | 836 | cmd->execute_cmd = ops->execute_sync_cache; |
d6e0175c CH |
837 | break; |
838 | case UNMAP: | |
14150a6b | 839 | if (!ops->execute_unmap) |
de103c93 | 840 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
14150a6b | 841 | |
1fd032ee | 842 | size = get_unaligned_be16(&cdb[7]); |
14150a6b | 843 | cmd->execute_cmd = ops->execute_unmap; |
d6e0175c CH |
844 | break; |
845 | case WRITE_SAME_16: | |
846 | sectors = transport_get_sectors_16(cdb); | |
847 | if (!sectors) { | |
848 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 849 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
850 | } |
851 | ||
1fd032ee | 852 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
853 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
854 | ||
cd063bef | 855 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 856 | if (ret) |
cd063bef | 857 | return ret; |
d6e0175c CH |
858 | break; |
859 | case WRITE_SAME: | |
860 | sectors = transport_get_sectors_10(cdb); | |
861 | if (!sectors) { | |
862 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); | |
de103c93 | 863 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
864 | } |
865 | ||
1fd032ee | 866 | size = sbc_get_size(cmd, 1); |
d6e0175c CH |
867 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
868 | ||
869 | /* | |
870 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence | |
871 | * of byte 1 bit 3 UNMAP instead of original reserved field | |
872 | */ | |
cd063bef | 873 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
6b64e1fe | 874 | if (ret) |
cd063bef | 875 | return ret; |
d6e0175c CH |
876 | break; |
877 | case VERIFY: | |
1fd032ee | 878 | size = 0; |
1920ed61 | 879 | cmd->execute_cmd = sbc_emulate_noop; |
d6e0175c | 880 | break; |
1a1ff38c BK |
881 | case REZERO_UNIT: |
882 | case SEEK_6: | |
883 | case SEEK_10: | |
884 | /* | |
885 | * There are still clients out there which use these old SCSI-2 | |
886 | * commands. This mainly happens when running VMs with legacy | |
887 | * guest systems, connected via SCSI command pass-through to | |
888 | * iSCSI targets. Make them happy and return status GOOD. | |
889 | */ | |
890 | size = 0; | |
891 | cmd->execute_cmd = sbc_emulate_noop; | |
892 | break; | |
d6e0175c | 893 | default: |
1fd032ee | 894 | ret = spc_parse_cdb(cmd, &size); |
d6e0175c CH |
895 | if (ret) |
896 | return ret; | |
897 | } | |
898 | ||
899 | /* reject any command that we don't have a handler for */ | |
900 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) | |
de103c93 | 901 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
d6e0175c CH |
902 | |
903 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { | |
1fd032ee CH |
904 | unsigned long long end_lba; |
905 | ||
0fd97ccf | 906 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
d6e0175c CH |
907 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
908 | " big sectors %u exceeds fabric_max_sectors:" | |
909 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 910 | dev->dev_attrib.fabric_max_sectors); |
de103c93 | 911 | return TCM_INVALID_CDB_FIELD; |
d6e0175c | 912 | } |
0fd97ccf | 913 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
d6e0175c CH |
914 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
915 | " big sectors %u exceeds backend hw_max_sectors:" | |
916 | " %u\n", cdb[0], sectors, | |
0fd97ccf | 917 | dev->dev_attrib.hw_max_sectors); |
de103c93 | 918 | return TCM_INVALID_CDB_FIELD; |
d6e0175c CH |
919 | } |
920 | ||
1fd032ee CH |
921 | end_lba = dev->transport->get_blocks(dev) + 1; |
922 | if (cmd->t_task_lba + sectors > end_lba) { | |
923 | pr_err("cmd exceeds last lba %llu " | |
924 | "(lba %llu, sectors %u)\n", | |
925 | end_lba, cmd->t_task_lba, sectors); | |
09ceadc7 | 926 | return TCM_ADDRESS_OUT_OF_RANGE; |
1fd032ee CH |
927 | } |
928 | ||
68ff9b9b NB |
929 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
930 | size = sbc_get_size(cmd, sectors); | |
d6e0175c CH |
931 | } |
932 | ||
de103c93 | 933 | return target_cmd_size_check(cmd, size); |
d6e0175c CH |
934 | } |
935 | EXPORT_SYMBOL(sbc_parse_cdb); | |
6f23ac8a | 936 | |
6f23ac8a CH |
937 | u32 sbc_get_device_type(struct se_device *dev) |
938 | { | |
939 | return TYPE_DISK; | |
940 | } | |
941 | EXPORT_SYMBOL(sbc_get_device_type); | |
86d71829 AH |
942 | |
943 | sense_reason_t | |
944 | sbc_execute_unmap(struct se_cmd *cmd, | |
945 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, | |
946 | sector_t, sector_t), | |
947 | void *priv) | |
948 | { | |
949 | struct se_device *dev = cmd->se_dev; | |
950 | unsigned char *buf, *ptr = NULL; | |
951 | sector_t lba; | |
952 | int size; | |
953 | u32 range; | |
954 | sense_reason_t ret = 0; | |
955 | int dl, bd_dl; | |
956 | ||
957 | /* We never set ANC_SUP */ | |
958 | if (cmd->t_task_cdb[1]) | |
959 | return TCM_INVALID_CDB_FIELD; | |
960 | ||
961 | if (cmd->data_length == 0) { | |
962 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
963 | return 0; | |
964 | } | |
965 | ||
966 | if (cmd->data_length < 8) { | |
967 | pr_warn("UNMAP parameter list length %u too small\n", | |
968 | cmd->data_length); | |
969 | return TCM_PARAMETER_LIST_LENGTH_ERROR; | |
970 | } | |
971 | ||
972 | buf = transport_kmap_data_sg(cmd); | |
973 | if (!buf) | |
974 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
975 | ||
976 | dl = get_unaligned_be16(&buf[0]); | |
977 | bd_dl = get_unaligned_be16(&buf[2]); | |
978 | ||
979 | size = cmd->data_length - 8; | |
980 | if (bd_dl > size) | |
981 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", | |
982 | cmd->data_length, bd_dl); | |
983 | else | |
984 | size = bd_dl; | |
985 | ||
986 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { | |
987 | ret = TCM_INVALID_PARAMETER_LIST; | |
988 | goto err; | |
989 | } | |
990 | ||
991 | /* First UNMAP block descriptor starts at 8 byte offset */ | |
992 | ptr = &buf[8]; | |
993 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" | |
994 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); | |
995 | ||
996 | while (size >= 16) { | |
997 | lba = get_unaligned_be64(&ptr[0]); | |
998 | range = get_unaligned_be32(&ptr[8]); | |
999 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", | |
1000 | (unsigned long long)lba, range); | |
1001 | ||
1002 | if (range > dev->dev_attrib.max_unmap_lba_count) { | |
1003 | ret = TCM_INVALID_PARAMETER_LIST; | |
1004 | goto err; | |
1005 | } | |
1006 | ||
1007 | if (lba + range > dev->transport->get_blocks(dev) + 1) { | |
1008 | ret = TCM_ADDRESS_OUT_OF_RANGE; | |
1009 | goto err; | |
1010 | } | |
1011 | ||
1012 | ret = do_unmap_fn(cmd, priv, lba, range); | |
1013 | if (ret) | |
1014 | goto err; | |
1015 | ||
1016 | ptr += 16; | |
1017 | size -= 16; | |
1018 | } | |
1019 | ||
1020 | err: | |
1021 | transport_kunmap_data_sg(cmd); | |
1022 | if (!ret) | |
1023 | target_complete_cmd(cmd, GOOD); | |
1024 | return ret; | |
1025 | } | |
1026 | EXPORT_SYMBOL(sbc_execute_unmap); |