1d6e0175cSChristoph Hellwig /* 2d6e0175cSChristoph Hellwig * SCSI Block Commands (SBC) parsing and emulation. 3d6e0175cSChristoph Hellwig * 4d6e0175cSChristoph Hellwig * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. 5d6e0175cSChristoph Hellwig * Copyright (c) 2005, 2006, 2007 SBE, Inc. 6d6e0175cSChristoph Hellwig * Copyright (c) 2007-2010 Rising Tide Systems 7d6e0175cSChristoph Hellwig * Copyright (c) 2008-2010 Linux-iSCSI.org 8d6e0175cSChristoph Hellwig * 9d6e0175cSChristoph Hellwig * Nicholas A. Bellinger <nab@kernel.org> 10d6e0175cSChristoph Hellwig * 11d6e0175cSChristoph Hellwig * This program is free software; you can redistribute it and/or modify 12d6e0175cSChristoph Hellwig * it under the terms of the GNU General Public License as published by 13d6e0175cSChristoph Hellwig * the Free Software Foundation; either version 2 of the License, or 14d6e0175cSChristoph Hellwig * (at your option) any later version. 15d6e0175cSChristoph Hellwig * 16d6e0175cSChristoph Hellwig * This program is distributed in the hope that it will be useful, 17d6e0175cSChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 18d6e0175cSChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19d6e0175cSChristoph Hellwig * GNU General Public License for more details. 20d6e0175cSChristoph Hellwig * 21d6e0175cSChristoph Hellwig * You should have received a copy of the GNU General Public License 22d6e0175cSChristoph Hellwig * along with this program; if not, write to the Free Software 23d6e0175cSChristoph Hellwig * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24d6e0175cSChristoph Hellwig */ 25d6e0175cSChristoph Hellwig 26d6e0175cSChristoph Hellwig #include <linux/kernel.h> 27d6e0175cSChristoph Hellwig #include <linux/module.h> 28d6e0175cSChristoph Hellwig #include <linux/ratelimit.h> 29d6e0175cSChristoph Hellwig #include <asm/unaligned.h> 30d6e0175cSChristoph Hellwig #include <scsi/scsi.h> 31d6e0175cSChristoph Hellwig 32d6e0175cSChristoph Hellwig #include <target/target_core_base.h> 33d6e0175cSChristoph Hellwig #include <target/target_core_backend.h> 34d6e0175cSChristoph Hellwig #include <target/target_core_fabric.h> 35d6e0175cSChristoph Hellwig 36d6e0175cSChristoph Hellwig #include "target_core_internal.h" 37d6e0175cSChristoph Hellwig #include "target_core_ua.h" 38d6e0175cSChristoph Hellwig 39d6e0175cSChristoph Hellwig 401fd032eeSChristoph Hellwig static int sbc_emulate_readcapacity(struct se_cmd *cmd) 411fd032eeSChristoph Hellwig { 421fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 431fd032eeSChristoph Hellwig unsigned char *buf; 441fd032eeSChristoph Hellwig unsigned long long blocks_long = dev->transport->get_blocks(dev); 451fd032eeSChristoph Hellwig u32 blocks; 461fd032eeSChristoph Hellwig 471fd032eeSChristoph Hellwig if (blocks_long >= 0x00000000ffffffff) 481fd032eeSChristoph Hellwig blocks = 0xffffffff; 491fd032eeSChristoph Hellwig else 501fd032eeSChristoph Hellwig blocks = (u32)blocks_long; 511fd032eeSChristoph Hellwig 521fd032eeSChristoph Hellwig buf = transport_kmap_data_sg(cmd); 531fd032eeSChristoph Hellwig 541fd032eeSChristoph Hellwig buf[0] = (blocks >> 24) & 0xff; 551fd032eeSChristoph Hellwig buf[1] = (blocks >> 16) & 0xff; 561fd032eeSChristoph Hellwig buf[2] = (blocks >> 8) & 0xff; 571fd032eeSChristoph Hellwig buf[3] = blocks & 0xff; 581fd032eeSChristoph Hellwig buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; 591fd032eeSChristoph Hellwig buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; 601fd032eeSChristoph Hellwig buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; 611fd032eeSChristoph Hellwig buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; 621fd032eeSChristoph Hellwig 631fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 641fd032eeSChristoph Hellwig 651fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 661fd032eeSChristoph Hellwig return 0; 671fd032eeSChristoph Hellwig } 681fd032eeSChristoph Hellwig 691fd032eeSChristoph Hellwig static int sbc_emulate_readcapacity_16(struct se_cmd *cmd) 701fd032eeSChristoph Hellwig { 711fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 721fd032eeSChristoph Hellwig unsigned char *buf; 731fd032eeSChristoph Hellwig unsigned long long blocks = dev->transport->get_blocks(dev); 741fd032eeSChristoph Hellwig 751fd032eeSChristoph Hellwig buf = transport_kmap_data_sg(cmd); 761fd032eeSChristoph Hellwig 771fd032eeSChristoph Hellwig buf[0] = (blocks >> 56) & 0xff; 781fd032eeSChristoph Hellwig buf[1] = (blocks >> 48) & 0xff; 791fd032eeSChristoph Hellwig buf[2] = (blocks >> 40) & 0xff; 801fd032eeSChristoph Hellwig buf[3] = (blocks >> 32) & 0xff; 811fd032eeSChristoph Hellwig buf[4] = (blocks >> 24) & 0xff; 821fd032eeSChristoph Hellwig buf[5] = (blocks >> 16) & 0xff; 831fd032eeSChristoph Hellwig buf[6] = (blocks >> 8) & 0xff; 841fd032eeSChristoph Hellwig buf[7] = blocks & 0xff; 851fd032eeSChristoph Hellwig buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; 861fd032eeSChristoph Hellwig buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; 871fd032eeSChristoph Hellwig buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; 881fd032eeSChristoph Hellwig buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; 891fd032eeSChristoph Hellwig /* 901fd032eeSChristoph Hellwig * Set Thin Provisioning Enable bit following sbc3r22 in section 911fd032eeSChristoph Hellwig * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 921fd032eeSChristoph Hellwig */ 931fd032eeSChristoph Hellwig if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) 941fd032eeSChristoph Hellwig buf[14] = 0x80; 951fd032eeSChristoph Hellwig 961fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 971fd032eeSChristoph Hellwig 981fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 991fd032eeSChristoph Hellwig return 0; 1001fd032eeSChristoph Hellwig } 1011fd032eeSChristoph Hellwig 1021fd032eeSChristoph Hellwig /* 1031fd032eeSChristoph Hellwig * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. 1041fd032eeSChristoph Hellwig * Note this is not used for TCM/pSCSI passthrough 1051fd032eeSChristoph Hellwig */ 1061fd032eeSChristoph Hellwig static int sbc_emulate_unmap(struct se_cmd *cmd) 1071fd032eeSChristoph Hellwig { 1081fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 1091fd032eeSChristoph Hellwig unsigned char *buf, *ptr = NULL; 1101fd032eeSChristoph Hellwig unsigned char *cdb = &cmd->t_task_cdb[0]; 1111fd032eeSChristoph Hellwig sector_t lba; 1121fd032eeSChristoph Hellwig unsigned int size = cmd->data_length, range; 1131fd032eeSChristoph Hellwig int ret = 0, offset; 1141fd032eeSChristoph Hellwig unsigned short dl, bd_dl; 1151fd032eeSChristoph Hellwig 1161fd032eeSChristoph Hellwig if (!dev->transport->do_discard) { 1171fd032eeSChristoph Hellwig pr_err("UNMAP emulation not supported for: %s\n", 1181fd032eeSChristoph Hellwig dev->transport->name); 1191fd032eeSChristoph Hellwig cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1201fd032eeSChristoph Hellwig return -ENOSYS; 1211fd032eeSChristoph Hellwig } 1221fd032eeSChristoph Hellwig 1231fd032eeSChristoph Hellwig /* First UNMAP block descriptor starts at 8 byte offset */ 1241fd032eeSChristoph Hellwig offset = 8; 1251fd032eeSChristoph Hellwig size -= 8; 1261fd032eeSChristoph Hellwig dl = get_unaligned_be16(&cdb[0]); 1271fd032eeSChristoph Hellwig bd_dl = get_unaligned_be16(&cdb[2]); 1281fd032eeSChristoph Hellwig 1291fd032eeSChristoph Hellwig buf = transport_kmap_data_sg(cmd); 1301fd032eeSChristoph Hellwig 1311fd032eeSChristoph Hellwig ptr = &buf[offset]; 1321fd032eeSChristoph Hellwig pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu" 1331fd032eeSChristoph Hellwig " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 1341fd032eeSChristoph Hellwig 1351fd032eeSChristoph Hellwig while (size) { 1361fd032eeSChristoph Hellwig lba = get_unaligned_be64(&ptr[0]); 1371fd032eeSChristoph Hellwig range = get_unaligned_be32(&ptr[8]); 1381fd032eeSChristoph Hellwig pr_debug("UNMAP: Using lba: %llu and range: %u\n", 1391fd032eeSChristoph Hellwig (unsigned long long)lba, range); 1401fd032eeSChristoph Hellwig 1411fd032eeSChristoph Hellwig ret = dev->transport->do_discard(dev, lba, range); 1421fd032eeSChristoph Hellwig if (ret < 0) { 1431fd032eeSChristoph Hellwig pr_err("blkdev_issue_discard() failed: %d\n", 1441fd032eeSChristoph Hellwig ret); 1451fd032eeSChristoph Hellwig goto err; 1461fd032eeSChristoph Hellwig } 1471fd032eeSChristoph Hellwig 1481fd032eeSChristoph Hellwig ptr += 16; 1491fd032eeSChristoph Hellwig size -= 16; 1501fd032eeSChristoph Hellwig } 1511fd032eeSChristoph Hellwig 1521fd032eeSChristoph Hellwig err: 1531fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 1541fd032eeSChristoph Hellwig if (!ret) 1551fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 1561fd032eeSChristoph Hellwig return ret; 1571fd032eeSChristoph Hellwig } 1581fd032eeSChristoph Hellwig 1591fd032eeSChristoph Hellwig /* 1601fd032eeSChristoph Hellwig * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. 1611fd032eeSChristoph Hellwig * Note this is not used for TCM/pSCSI passthrough 1621fd032eeSChristoph Hellwig */ 1631fd032eeSChristoph Hellwig static int sbc_emulate_write_same(struct se_cmd *cmd) 1641fd032eeSChristoph Hellwig { 1651fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 1661fd032eeSChristoph Hellwig sector_t range; 1671fd032eeSChristoph Hellwig sector_t lba = cmd->t_task_lba; 1681fd032eeSChristoph Hellwig u32 num_blocks; 1691fd032eeSChristoph Hellwig int ret; 1701fd032eeSChristoph Hellwig 1711fd032eeSChristoph Hellwig if (!dev->transport->do_discard) { 1721fd032eeSChristoph Hellwig pr_err("WRITE_SAME emulation not supported" 1731fd032eeSChristoph Hellwig " for: %s\n", dev->transport->name); 1741fd032eeSChristoph Hellwig cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1751fd032eeSChristoph Hellwig return -ENOSYS; 1761fd032eeSChristoph Hellwig } 1771fd032eeSChristoph Hellwig 1781fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 1791fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 1801fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 1811fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1821fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 1831fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1841fd032eeSChristoph Hellwig 1851fd032eeSChristoph Hellwig /* 1861fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 1871fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 1881fd032eeSChristoph Hellwig */ 1891fd032eeSChristoph Hellwig if (num_blocks != 0) 1901fd032eeSChristoph Hellwig range = num_blocks; 1911fd032eeSChristoph Hellwig else 1921fd032eeSChristoph Hellwig range = (dev->transport->get_blocks(dev) - lba) + 1; 1931fd032eeSChristoph Hellwig 1941fd032eeSChristoph Hellwig pr_debug("WRITE_SAME UNMAP: LBA: %llu Range: %llu\n", 1951fd032eeSChristoph Hellwig (unsigned long long)lba, (unsigned long long)range); 1961fd032eeSChristoph Hellwig 1971fd032eeSChristoph Hellwig ret = dev->transport->do_discard(dev, lba, range); 1981fd032eeSChristoph Hellwig if (ret < 0) { 1991fd032eeSChristoph Hellwig pr_debug("blkdev_issue_discard() failed for WRITE_SAME\n"); 2001fd032eeSChristoph Hellwig return ret; 2011fd032eeSChristoph Hellwig } 2021fd032eeSChristoph Hellwig 2031fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 2041fd032eeSChristoph Hellwig return 0; 2051fd032eeSChristoph Hellwig } 2061fd032eeSChristoph Hellwig 2071fd032eeSChristoph Hellwig static int sbc_emulate_verify(struct se_cmd *cmd) 2081fd032eeSChristoph Hellwig { 2091fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 2101fd032eeSChristoph Hellwig return 0; 2111fd032eeSChristoph Hellwig } 2121fd032eeSChristoph Hellwig 213d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 214d6e0175cSChristoph Hellwig { 215d6e0175cSChristoph Hellwig return cmd->se_dev->se_sub_dev->se_dev_attrib.block_size * sectors; 216d6e0175cSChristoph Hellwig } 217d6e0175cSChristoph Hellwig 218d6e0175cSChristoph Hellwig static int sbc_check_valid_sectors(struct se_cmd *cmd) 219d6e0175cSChristoph Hellwig { 220d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 221d6e0175cSChristoph Hellwig unsigned long long end_lba; 222d6e0175cSChristoph Hellwig u32 sectors; 223d6e0175cSChristoph Hellwig 224d6e0175cSChristoph Hellwig sectors = cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size; 225d6e0175cSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 226d6e0175cSChristoph Hellwig 227d6e0175cSChristoph Hellwig if (cmd->t_task_lba + sectors > end_lba) { 228d6e0175cSChristoph Hellwig pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", 229d6e0175cSChristoph Hellwig cmd->t_task_lba, sectors, end_lba); 230d6e0175cSChristoph Hellwig return -EINVAL; 231d6e0175cSChristoph Hellwig } 232d6e0175cSChristoph Hellwig 233d6e0175cSChristoph Hellwig return 0; 234d6e0175cSChristoph Hellwig } 235d6e0175cSChristoph Hellwig 236d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 237d6e0175cSChristoph Hellwig { 238d6e0175cSChristoph Hellwig /* 239d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 240d6e0175cSChristoph Hellwig * 241d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 242d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 243d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 244d6e0175cSChristoph Hellwig * written. 245d6e0175cSChristoph Hellwig */ 246d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 247d6e0175cSChristoph Hellwig } 248d6e0175cSChristoph Hellwig 249d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 250d6e0175cSChristoph Hellwig { 251d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 252d6e0175cSChristoph Hellwig } 253d6e0175cSChristoph Hellwig 254d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 255d6e0175cSChristoph Hellwig { 256d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 257d6e0175cSChristoph Hellwig } 258d6e0175cSChristoph Hellwig 259d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 260d6e0175cSChristoph Hellwig { 261d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 262d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 263d6e0175cSChristoph Hellwig } 264d6e0175cSChristoph Hellwig 265d6e0175cSChristoph Hellwig /* 266d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 267d6e0175cSChristoph Hellwig */ 268d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 269d6e0175cSChristoph Hellwig { 270d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 271d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 272d6e0175cSChristoph Hellwig 273d6e0175cSChristoph Hellwig } 274d6e0175cSChristoph Hellwig 275d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 276d6e0175cSChristoph Hellwig { 277d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 278d6e0175cSChristoph Hellwig } 279d6e0175cSChristoph Hellwig 280d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 281d6e0175cSChristoph Hellwig { 282d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 283d6e0175cSChristoph Hellwig } 284d6e0175cSChristoph Hellwig 285d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 286d6e0175cSChristoph Hellwig { 287d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 288d6e0175cSChristoph Hellwig 289d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 290d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 291d6e0175cSChristoph Hellwig 292d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 293d6e0175cSChristoph Hellwig } 294d6e0175cSChristoph Hellwig 295d6e0175cSChristoph Hellwig /* 296d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 297d6e0175cSChristoph Hellwig */ 298d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 299d6e0175cSChristoph Hellwig { 300d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 301d6e0175cSChristoph Hellwig 302d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 303d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 304d6e0175cSChristoph Hellwig 305d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 306d6e0175cSChristoph Hellwig } 307d6e0175cSChristoph Hellwig 308d6e0175cSChristoph Hellwig static int sbc_write_same_supported(struct se_device *dev, 309d6e0175cSChristoph Hellwig unsigned char *flags) 310d6e0175cSChristoph Hellwig { 311d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 312d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 313d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 314d6e0175cSChristoph Hellwig " Emulation\n"); 315d6e0175cSChristoph Hellwig return -ENOSYS; 316d6e0175cSChristoph Hellwig } 317d6e0175cSChristoph Hellwig 318d6e0175cSChristoph Hellwig /* 319d6e0175cSChristoph Hellwig * Currently for the emulated case we only accept 320d6e0175cSChristoph Hellwig * tpws with the UNMAP=1 bit set. 321d6e0175cSChristoph Hellwig */ 322d6e0175cSChristoph Hellwig if (!(flags[0] & 0x08)) { 323d6e0175cSChristoph Hellwig pr_err("WRITE_SAME w/o UNMAP bit not" 324d6e0175cSChristoph Hellwig " supported for Block Discard Emulation\n"); 325d6e0175cSChristoph Hellwig return -ENOSYS; 326d6e0175cSChristoph Hellwig } 327d6e0175cSChristoph Hellwig 328d6e0175cSChristoph Hellwig return 0; 329d6e0175cSChristoph Hellwig } 330d6e0175cSChristoph Hellwig 331d6e0175cSChristoph Hellwig static void xdreadwrite_callback(struct se_cmd *cmd) 332d6e0175cSChristoph Hellwig { 333d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 334d6e0175cSChristoph Hellwig struct scatterlist *sg; 335d6e0175cSChristoph Hellwig unsigned int offset; 336d6e0175cSChristoph Hellwig int i; 337d6e0175cSChristoph Hellwig int count; 338d6e0175cSChristoph Hellwig /* 339d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 340d6e0175cSChristoph Hellwig * 341d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 342d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 343d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 344d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 345d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 346d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 347d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 348d6e0175cSChristoph Hellwig */ 349d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 350d6e0175cSChristoph Hellwig if (!buf) { 351d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 352d6e0175cSChristoph Hellwig return; 353d6e0175cSChristoph Hellwig } 354d6e0175cSChristoph Hellwig /* 355d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 356d6e0175cSChristoph Hellwig * into the locally allocated *buf 357d6e0175cSChristoph Hellwig */ 358d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 359d6e0175cSChristoph Hellwig cmd->t_data_nents, 360d6e0175cSChristoph Hellwig buf, 361d6e0175cSChristoph Hellwig cmd->data_length); 362d6e0175cSChristoph Hellwig 363d6e0175cSChristoph Hellwig /* 364d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 365d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 366d6e0175cSChristoph Hellwig */ 367d6e0175cSChristoph Hellwig 368d6e0175cSChristoph Hellwig offset = 0; 369d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 370d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 371d6e0175cSChristoph Hellwig if (!addr) 372d6e0175cSChristoph Hellwig goto out; 373d6e0175cSChristoph Hellwig 374d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 375d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 376d6e0175cSChristoph Hellwig 377d6e0175cSChristoph Hellwig offset += sg->length; 378d6e0175cSChristoph Hellwig kunmap_atomic(addr); 379d6e0175cSChristoph Hellwig } 380d6e0175cSChristoph Hellwig 381d6e0175cSChristoph Hellwig out: 382d6e0175cSChristoph Hellwig kfree(buf); 383d6e0175cSChristoph Hellwig } 384d6e0175cSChristoph Hellwig 3850c2ad7d1SChristoph Hellwig int sbc_parse_cdb(struct se_cmd *cmd, struct spc_ops *ops) 386d6e0175cSChristoph Hellwig { 387d6e0175cSChristoph Hellwig struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 388d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 389d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 3901fd032eeSChristoph Hellwig unsigned int size; 391d6e0175cSChristoph Hellwig u32 sectors = 0; 392d6e0175cSChristoph Hellwig int ret; 393d6e0175cSChristoph Hellwig 394d6e0175cSChristoph Hellwig switch (cdb[0]) { 395d6e0175cSChristoph Hellwig case READ_6: 396d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 397d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 398d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3990c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 400d6e0175cSChristoph Hellwig break; 401d6e0175cSChristoph Hellwig case READ_10: 402d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 403d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 404d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4050c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 406d6e0175cSChristoph Hellwig break; 407d6e0175cSChristoph Hellwig case READ_12: 408d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 409d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 410d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4110c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 412d6e0175cSChristoph Hellwig break; 413d6e0175cSChristoph Hellwig case READ_16: 414d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 415d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 416d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4170c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 418d6e0175cSChristoph Hellwig break; 419d6e0175cSChristoph Hellwig case WRITE_6: 420d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 421d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 422d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4230c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 424d6e0175cSChristoph Hellwig break; 425d6e0175cSChristoph Hellwig case WRITE_10: 426d6e0175cSChristoph Hellwig case WRITE_VERIFY: 427d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 428d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 429d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 430d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 431d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4320c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 433d6e0175cSChristoph Hellwig break; 434d6e0175cSChristoph Hellwig case WRITE_12: 435d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 436d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 437d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 438d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 439d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4400c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 441d6e0175cSChristoph Hellwig break; 442d6e0175cSChristoph Hellwig case WRITE_16: 443d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 444d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 445d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 446d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 447d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 4480c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 449d6e0175cSChristoph Hellwig break; 450d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 451d6e0175cSChristoph Hellwig if ((cmd->data_direction != DMA_TO_DEVICE) || 452d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 453d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 454d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 455d6e0175cSChristoph Hellwig 456d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 457d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 458d6e0175cSChristoph Hellwig 459d6e0175cSChristoph Hellwig /* 460d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 461d6e0175cSChristoph Hellwig */ 4620c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 463d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 464d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 465d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 466d6e0175cSChristoph Hellwig break; 467d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 468d6e0175cSChristoph Hellwig { 469d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 470d6e0175cSChristoph Hellwig switch (service_action) { 471d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 472d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 473d6e0175cSChristoph Hellwig 474d6e0175cSChristoph Hellwig /* 475d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 476d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 477d6e0175cSChristoph Hellwig */ 478d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 479d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 480d6e0175cSChristoph Hellwig 481d6e0175cSChristoph Hellwig /* 482d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 483d6e0175cSChristoph Hellwig * completion. 484d6e0175cSChristoph Hellwig */ 4850c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 486d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 487d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 488d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 489d6e0175cSChristoph Hellwig break; 490d6e0175cSChristoph Hellwig case WRITE_SAME_32: 491d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 492d6e0175cSChristoph Hellwig if (!sectors) { 493d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 494d6e0175cSChristoph Hellwig " supported\n"); 495d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 496d6e0175cSChristoph Hellwig } 497d6e0175cSChristoph Hellwig 4981fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 499d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 500d6e0175cSChristoph Hellwig 501d6e0175cSChristoph Hellwig if (sbc_write_same_supported(dev, &cdb[10]) < 0) 502d6e0175cSChristoph Hellwig goto out_unsupported_cdb; 5031fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_write_same; 504d6e0175cSChristoph Hellwig break; 505d6e0175cSChristoph Hellwig default: 506d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 507d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 508d6e0175cSChristoph Hellwig goto out_unsupported_cdb; 509d6e0175cSChristoph Hellwig } 510d6e0175cSChristoph Hellwig break; 511d6e0175cSChristoph Hellwig } 512d6e0175cSChristoph Hellwig case READ_CAPACITY: 5131fd032eeSChristoph Hellwig size = READ_CAP_LEN; 5141fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 515d6e0175cSChristoph Hellwig break; 516d6e0175cSChristoph Hellwig case SERVICE_ACTION_IN: 517d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 518d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 5191fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 520d6e0175cSChristoph Hellwig break; 521d6e0175cSChristoph Hellwig default: 522d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 523d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 524d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 525d6e0175cSChristoph Hellwig } 5261fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 527d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 528d6e0175cSChristoph Hellwig break; 529d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 530d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 531ad67f0d9SChristoph Hellwig if (!ops->execute_sync_cache) 532ad67f0d9SChristoph Hellwig goto out_unsupported_cdb; 533ad67f0d9SChristoph Hellwig 534d6e0175cSChristoph Hellwig /* 535d6e0175cSChristoph Hellwig * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE 536d6e0175cSChristoph Hellwig */ 537d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 538d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 539d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 540d6e0175cSChristoph Hellwig } else { 541d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 542d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 543d6e0175cSChristoph Hellwig } 544d6e0175cSChristoph Hellwig 5451fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 546d6e0175cSChristoph Hellwig 547d6e0175cSChristoph Hellwig /* 548d6e0175cSChristoph Hellwig * Check to ensure that LBA + Range does not exceed past end of 549d6e0175cSChristoph Hellwig * device for IBLOCK and FILEIO ->do_sync_cache() backend calls 550d6e0175cSChristoph Hellwig */ 551d6e0175cSChristoph Hellwig if (cmd->t_task_lba || sectors) { 552d6e0175cSChristoph Hellwig if (sbc_check_valid_sectors(cmd) < 0) 553d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 554d6e0175cSChristoph Hellwig } 555ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 556d6e0175cSChristoph Hellwig break; 557d6e0175cSChristoph Hellwig case UNMAP: 5581fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 5591fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_unmap; 560d6e0175cSChristoph Hellwig break; 561d6e0175cSChristoph Hellwig case WRITE_SAME_16: 562d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 563d6e0175cSChristoph Hellwig if (!sectors) { 564d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 565d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 566d6e0175cSChristoph Hellwig } 567d6e0175cSChristoph Hellwig 5681fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 569d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 570d6e0175cSChristoph Hellwig 571d6e0175cSChristoph Hellwig if (sbc_write_same_supported(dev, &cdb[1]) < 0) 572d6e0175cSChristoph Hellwig goto out_unsupported_cdb; 5731fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_write_same; 574d6e0175cSChristoph Hellwig break; 575d6e0175cSChristoph Hellwig case WRITE_SAME: 576d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 577d6e0175cSChristoph Hellwig if (!sectors) { 578d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 579d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 580d6e0175cSChristoph Hellwig } 581d6e0175cSChristoph Hellwig 5821fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 583d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 584d6e0175cSChristoph Hellwig 585d6e0175cSChristoph Hellwig /* 586d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 587d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 588d6e0175cSChristoph Hellwig */ 589d6e0175cSChristoph Hellwig if (sbc_write_same_supported(dev, &cdb[1]) < 0) 590d6e0175cSChristoph Hellwig goto out_unsupported_cdb; 5911fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_write_same; 592d6e0175cSChristoph Hellwig break; 593d6e0175cSChristoph Hellwig case VERIFY: 5941fd032eeSChristoph Hellwig size = 0; 5951fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_verify; 596d6e0175cSChristoph Hellwig break; 597d6e0175cSChristoph Hellwig default: 5981fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 599d6e0175cSChristoph Hellwig if (ret) 600d6e0175cSChristoph Hellwig return ret; 601d6e0175cSChristoph Hellwig } 602d6e0175cSChristoph Hellwig 603d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 604d6e0175cSChristoph Hellwig if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) 605d6e0175cSChristoph Hellwig goto out_unsupported_cdb; 606d6e0175cSChristoph Hellwig 607d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 6081fd032eeSChristoph Hellwig unsigned long long end_lba; 6091fd032eeSChristoph Hellwig 610d6e0175cSChristoph Hellwig if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) { 611d6e0175cSChristoph Hellwig printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 612d6e0175cSChristoph Hellwig " big sectors %u exceeds fabric_max_sectors:" 613d6e0175cSChristoph Hellwig " %u\n", cdb[0], sectors, 614d6e0175cSChristoph Hellwig su_dev->se_dev_attrib.fabric_max_sectors); 615d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 616d6e0175cSChristoph Hellwig } 617d6e0175cSChristoph Hellwig if (sectors > su_dev->se_dev_attrib.hw_max_sectors) { 618d6e0175cSChristoph Hellwig printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 619d6e0175cSChristoph Hellwig " big sectors %u exceeds backend hw_max_sectors:" 620d6e0175cSChristoph Hellwig " %u\n", cdb[0], sectors, 621d6e0175cSChristoph Hellwig su_dev->se_dev_attrib.hw_max_sectors); 622d6e0175cSChristoph Hellwig goto out_invalid_cdb_field; 623d6e0175cSChristoph Hellwig } 624d6e0175cSChristoph Hellwig 6251fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 6261fd032eeSChristoph Hellwig if (cmd->t_task_lba + sectors > end_lba) { 6271fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 6281fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 6291fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 6301fd032eeSChristoph Hellwig goto out_invalid_cdb_field; 631d6e0175cSChristoph Hellwig } 632d6e0175cSChristoph Hellwig 6331fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 6341fd032eeSChristoph Hellwig } 6351fd032eeSChristoph Hellwig 6361fd032eeSChristoph Hellwig ret = target_cmd_size_check(cmd, size); 6371fd032eeSChristoph Hellwig if (ret < 0) 6381fd032eeSChristoph Hellwig return ret; 6391fd032eeSChristoph Hellwig 640d6e0175cSChristoph Hellwig return 0; 641d6e0175cSChristoph Hellwig 642d6e0175cSChristoph Hellwig out_unsupported_cdb: 643d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 644d6e0175cSChristoph Hellwig cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 645d6e0175cSChristoph Hellwig return -EINVAL; 646d6e0175cSChristoph Hellwig out_invalid_cdb_field: 647d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 648d6e0175cSChristoph Hellwig cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 649d6e0175cSChristoph Hellwig return -EINVAL; 650d6e0175cSChristoph Hellwig } 651d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 652