Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 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 | |
| 207 | static int sbc_emulate_synchronize_cache(struct se_cmd *cmd) |
| 208 | { |
| 209 | if (!cmd->se_dev->transport->do_sync_cache) { |
| 210 | pr_err("SYNCHRONIZE_CACHE emulation not supported" |
| 211 | " for: %s\n", cmd->se_dev->transport->name); |
| 212 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 213 | return -ENOSYS; |
| 214 | } |
| 215 | |
| 216 | cmd->se_dev->transport->do_sync_cache(cmd); |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static int sbc_emulate_verify(struct se_cmd *cmd) |
| 221 | { |
| 222 | target_complete_cmd(cmd, GOOD); |
| 223 | return 0; |
| 224 | } |
| 225 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 226 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| 227 | { |
| 228 | return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors; |
| 229 | } |
| 230 | |
| 231 | static int sbc_check_valid_sectors(struct se_cmd *cmd) |
| 232 | { |
| 233 | struct se_device *dev = cmd->se_dev; |
| 234 | unsigned long long end_lba; |
| 235 | u32 sectors; |
| 236 | |
| 237 | sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size; |
| 238 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 239 | |
| 240 | if (cmd->t_task_lba + sectors > end_lba) { |
| 241 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", |
| 242 | cmd->t_task_lba, sectors, end_lba); |
| 243 | return -EINVAL; |
| 244 | } |
| 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| 250 | { |
| 251 | /* |
| 252 | * Use 8-bit sector value. SBC-3 says: |
| 253 | * |
| 254 | * A TRANSFER LENGTH field set to zero specifies that 256 |
| 255 | * logical blocks shall be written. Any other value |
| 256 | * specifies the number of logical blocks that shall be |
| 257 | * written. |
| 258 | */ |
| 259 | return cdb[4] ? : 256; |
| 260 | } |
| 261 | |
| 262 | static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| 263 | { |
| 264 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 265 | } |
| 266 | |
| 267 | static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| 268 | { |
| 269 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 270 | } |
| 271 | |
| 272 | static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| 273 | { |
| 274 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 275 | (cdb[12] << 8) + cdb[13]; |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 280 | */ |
| 281 | static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| 282 | { |
| 283 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 284 | (cdb[30] << 8) + cdb[31]; |
| 285 | |
| 286 | } |
| 287 | |
| 288 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 289 | { |
| 290 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 291 | } |
| 292 | |
| 293 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 294 | { |
| 295 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 296 | } |
| 297 | |
| 298 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 299 | { |
| 300 | unsigned int __v1, __v2; |
| 301 | |
| 302 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 303 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 304 | |
| 305 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 310 | */ |
| 311 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 312 | { |
| 313 | unsigned int __v1, __v2; |
| 314 | |
| 315 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 316 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 317 | |
| 318 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 319 | } |
| 320 | |
| 321 | static int sbc_write_same_supported(struct se_device *dev, |
| 322 | unsigned char *flags) |
| 323 | { |
| 324 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| 325 | pr_err("WRITE_SAME PBDATA and LBDATA" |
| 326 | " bits not supported for Block Discard" |
| 327 | " Emulation\n"); |
| 328 | return -ENOSYS; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Currently for the emulated case we only accept |
| 333 | * tpws with the UNMAP=1 bit set. |
| 334 | */ |
| 335 | if (!(flags[0] & 0x08)) { |
| 336 | pr_err("WRITE_SAME w/o UNMAP bit not" |
| 337 | " supported for Block Discard Emulation\n"); |
| 338 | return -ENOSYS; |
| 339 | } |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static void xdreadwrite_callback(struct se_cmd *cmd) |
| 345 | { |
| 346 | unsigned char *buf, *addr; |
| 347 | struct scatterlist *sg; |
| 348 | unsigned int offset; |
| 349 | int i; |
| 350 | int count; |
| 351 | /* |
| 352 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 353 | * |
| 354 | * 1) read the specified logical block(s); |
| 355 | * 2) transfer logical blocks from the data-out buffer; |
| 356 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 357 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 358 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 359 | * blocks transferred from the data-out buffer; and |
| 360 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 361 | */ |
| 362 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 363 | if (!buf) { |
| 364 | pr_err("Unable to allocate xor_callback buf\n"); |
| 365 | return; |
| 366 | } |
| 367 | /* |
| 368 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 369 | * into the locally allocated *buf |
| 370 | */ |
| 371 | sg_copy_to_buffer(cmd->t_data_sg, |
| 372 | cmd->t_data_nents, |
| 373 | buf, |
| 374 | cmd->data_length); |
| 375 | |
| 376 | /* |
| 377 | * Now perform the XOR against the BIDI read memory located at |
| 378 | * cmd->t_mem_bidi_list |
| 379 | */ |
| 380 | |
| 381 | offset = 0; |
| 382 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 383 | addr = kmap_atomic(sg_page(sg)); |
| 384 | if (!addr) |
| 385 | goto out; |
| 386 | |
| 387 | for (i = 0; i < sg->length; i++) |
| 388 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 389 | |
| 390 | offset += sg->length; |
| 391 | kunmap_atomic(addr); |
| 392 | } |
| 393 | |
| 394 | out: |
| 395 | kfree(buf); |
| 396 | } |
| 397 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 398 | int sbc_parse_cdb(struct se_cmd *cmd) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 399 | { |
| 400 | struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; |
| 401 | struct se_device *dev = cmd->se_dev; |
| 402 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 403 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 404 | u32 sectors = 0; |
| 405 | int ret; |
| 406 | |
| 407 | switch (cdb[0]) { |
| 408 | case READ_6: |
| 409 | sectors = transport_get_sectors_6(cdb); |
| 410 | cmd->t_task_lba = transport_lba_21(cdb); |
| 411 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 412 | break; |
| 413 | case READ_10: |
| 414 | sectors = transport_get_sectors_10(cdb); |
| 415 | cmd->t_task_lba = transport_lba_32(cdb); |
| 416 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 417 | break; |
| 418 | case READ_12: |
| 419 | sectors = transport_get_sectors_12(cdb); |
| 420 | cmd->t_task_lba = transport_lba_32(cdb); |
| 421 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 422 | break; |
| 423 | case READ_16: |
| 424 | sectors = transport_get_sectors_16(cdb); |
| 425 | cmd->t_task_lba = transport_lba_64(cdb); |
| 426 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 427 | break; |
| 428 | case WRITE_6: |
| 429 | sectors = transport_get_sectors_6(cdb); |
| 430 | cmd->t_task_lba = transport_lba_21(cdb); |
| 431 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 432 | break; |
| 433 | case WRITE_10: |
| 434 | case WRITE_VERIFY: |
| 435 | sectors = transport_get_sectors_10(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; |
| 440 | break; |
| 441 | case WRITE_12: |
| 442 | sectors = transport_get_sectors_12(cdb); |
| 443 | cmd->t_task_lba = transport_lba_32(cdb); |
| 444 | if (cdb[1] & 0x8) |
| 445 | cmd->se_cmd_flags |= SCF_FUA; |
| 446 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 447 | break; |
| 448 | case WRITE_16: |
| 449 | sectors = transport_get_sectors_16(cdb); |
| 450 | cmd->t_task_lba = transport_lba_64(cdb); |
| 451 | if (cdb[1] & 0x8) |
| 452 | cmd->se_cmd_flags |= SCF_FUA; |
| 453 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 454 | break; |
| 455 | case XDWRITEREAD_10: |
| 456 | if ((cmd->data_direction != DMA_TO_DEVICE) || |
| 457 | !(cmd->se_cmd_flags & SCF_BIDI)) |
| 458 | goto out_invalid_cdb_field; |
| 459 | sectors = transport_get_sectors_10(cdb); |
| 460 | |
| 461 | cmd->t_task_lba = transport_lba_32(cdb); |
| 462 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 463 | |
| 464 | /* |
| 465 | * Setup BIDI XOR callback to be run after I/O completion. |
| 466 | */ |
| 467 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 468 | if (cdb[1] & 0x8) |
| 469 | cmd->se_cmd_flags |= SCF_FUA; |
| 470 | break; |
| 471 | case VARIABLE_LENGTH_CMD: |
| 472 | { |
| 473 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 474 | switch (service_action) { |
| 475 | case XDWRITEREAD_32: |
| 476 | sectors = transport_get_sectors_32(cdb); |
| 477 | |
| 478 | /* |
| 479 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 480 | * XDWRITE_READ_32 logic. |
| 481 | */ |
| 482 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
| 483 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 484 | |
| 485 | /* |
| 486 | * Setup BIDI XOR callback to be run during after I/O |
| 487 | * completion. |
| 488 | */ |
| 489 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 490 | if (cdb[1] & 0x8) |
| 491 | cmd->se_cmd_flags |= SCF_FUA; |
| 492 | break; |
| 493 | case WRITE_SAME_32: |
| 494 | sectors = transport_get_sectors_32(cdb); |
| 495 | if (!sectors) { |
| 496 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 497 | " supported\n"); |
| 498 | goto out_invalid_cdb_field; |
| 499 | } |
| 500 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 501 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 502 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 503 | |
| 504 | if (sbc_write_same_supported(dev, &cdb[10]) < 0) |
| 505 | goto out_unsupported_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 506 | cmd->execute_cmd = sbc_emulate_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 507 | break; |
| 508 | default: |
| 509 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 510 | " 0x%04x not supported\n", service_action); |
| 511 | goto out_unsupported_cdb; |
| 512 | } |
| 513 | break; |
| 514 | } |
| 515 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 516 | size = READ_CAP_LEN; |
| 517 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 518 | break; |
| 519 | case SERVICE_ACTION_IN: |
| 520 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 521 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 522 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 523 | break; |
| 524 | default: |
| 525 | pr_err("Unsupported SA: 0x%02x\n", |
| 526 | cmd->t_task_cdb[1] & 0x1f); |
| 527 | goto out_invalid_cdb_field; |
| 528 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 529 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 530 | (cdb[12] << 8) | cdb[13]; |
| 531 | break; |
| 532 | case SYNCHRONIZE_CACHE: |
| 533 | case SYNCHRONIZE_CACHE_16: |
| 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 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 545 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 555 | cmd->execute_cmd = sbc_emulate_synchronize_cache; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 556 | break; |
| 557 | case UNMAP: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 558 | size = get_unaligned_be16(&cdb[7]); |
| 559 | cmd->execute_cmd = sbc_emulate_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 568 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 573 | cmd->execute_cmd = sbc_emulate_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 582 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 591 | cmd->execute_cmd = sbc_emulate_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 592 | break; |
| 593 | case VERIFY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 594 | size = 0; |
| 595 | cmd->execute_cmd = sbc_emulate_verify; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 596 | break; |
| 597 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 598 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 608 | unsigned long long end_lba; |
| 609 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 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); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 634 | } |
| 635 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame^] | 636 | ret = target_cmd_size_check(cmd, size); |
| 637 | if (ret < 0) |
| 638 | return ret; |
| 639 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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); |