Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * SCSI Block Commands (SBC) parsing and emulation. |
| 3 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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> |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 28 | #include <scsi/scsi_tcq.h> |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 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" |
| 36 | |
| 37 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 38 | static sense_reason_t |
| 39 | sbc_emulate_readcapacity(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 40 | { |
| 41 | struct se_device *dev = cmd->se_dev; |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 42 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 43 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 44 | unsigned char *rbuf; |
| 45 | unsigned char buf[8]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 46 | u32 blocks; |
| 47 | |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 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 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 63 | if (blocks_long >= 0x00000000ffffffff) |
| 64 | blocks = 0xffffffff; |
| 65 | else |
| 66 | blocks = (u32)blocks_long; |
| 67 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 68 | buf[0] = (blocks >> 24) & 0xff; |
| 69 | buf[1] = (blocks >> 16) & 0xff; |
| 70 | buf[2] = (blocks >> 8) & 0xff; |
| 71 | buf[3] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 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; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 76 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 77 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 78 | if (rbuf) { |
| 79 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 80 | transport_kunmap_data_sg(cmd); |
| 81 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 82 | |
| 83 | target_complete_cmd(cmd, GOOD); |
| 84 | return 0; |
| 85 | } |
| 86 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 87 | static sense_reason_t |
| 88 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 89 | { |
| 90 | struct se_device *dev = cmd->se_dev; |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 91 | unsigned char *rbuf; |
| 92 | unsigned char buf[32]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 93 | unsigned long long blocks = dev->transport->get_blocks(dev); |
| 94 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 95 | memset(buf, 0, sizeof(buf)); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 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; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 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; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 108 | /* |
| 109 | * Set Thin Provisioning Enable bit following sbc3r22 in section |
| 110 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. |
| 111 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 112 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 113 | buf[14] = 0x80; |
| 114 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 115 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 116 | if (rbuf) { |
| 117 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 118 | transport_kunmap_data_sg(cmd); |
| 119 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 120 | |
| 121 | target_complete_cmd(cmd, GOOD); |
| 122 | return 0; |
| 123 | } |
| 124 | |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 125 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 126 | { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 127 | u32 num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 128 | |
| 129 | if (cmd->t_task_cdb[0] == WRITE_SAME) |
| 130 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); |
| 131 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) |
| 132 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); |
| 133 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ |
| 134 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); |
| 135 | |
| 136 | /* |
| 137 | * Use the explicit range when non zero is supplied, otherwise calculate |
| 138 | * the remaining range based on ->get_blocks() - starting LBA. |
| 139 | */ |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 140 | if (num_blocks) |
| 141 | return num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 142 | |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 143 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
| 144 | cmd->t_task_lba + 1; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 145 | } |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 146 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 147 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 148 | static sense_reason_t |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 149 | sbc_emulate_noop(struct se_cmd *cmd) |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 150 | { |
| 151 | target_complete_cmd(cmd, GOOD); |
| 152 | return 0; |
| 153 | } |
| 154 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 155 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| 156 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 157 | return cmd->se_dev->dev_attrib.block_size * sectors; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static int sbc_check_valid_sectors(struct se_cmd *cmd) |
| 161 | { |
| 162 | struct se_device *dev = cmd->se_dev; |
| 163 | unsigned long long end_lba; |
| 164 | u32 sectors; |
| 165 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 166 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 167 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 168 | |
| 169 | if (cmd->t_task_lba + sectors > end_lba) { |
| 170 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", |
| 171 | cmd->t_task_lba, sectors, end_lba); |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| 179 | { |
| 180 | /* |
| 181 | * Use 8-bit sector value. SBC-3 says: |
| 182 | * |
| 183 | * A TRANSFER LENGTH field set to zero specifies that 256 |
| 184 | * logical blocks shall be written. Any other value |
| 185 | * specifies the number of logical blocks that shall be |
| 186 | * written. |
| 187 | */ |
| 188 | return cdb[4] ? : 256; |
| 189 | } |
| 190 | |
| 191 | static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| 192 | { |
| 193 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 194 | } |
| 195 | |
| 196 | static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| 197 | { |
| 198 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 199 | } |
| 200 | |
| 201 | static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| 202 | { |
| 203 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 204 | (cdb[12] << 8) + cdb[13]; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 209 | */ |
| 210 | static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| 211 | { |
| 212 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 213 | (cdb[30] << 8) + cdb[31]; |
| 214 | |
| 215 | } |
| 216 | |
| 217 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 218 | { |
| 219 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 220 | } |
| 221 | |
| 222 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 223 | { |
| 224 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 225 | } |
| 226 | |
| 227 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 228 | { |
| 229 | unsigned int __v1, __v2; |
| 230 | |
| 231 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 232 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 233 | |
| 234 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 239 | */ |
| 240 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 241 | { |
| 242 | unsigned int __v1, __v2; |
| 243 | |
| 244 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 245 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 246 | |
| 247 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 248 | } |
| 249 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 250 | static sense_reason_t |
| 251 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 252 | { |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 253 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 254 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 255 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| 256 | pr_err("WRITE_SAME PBDATA and LBDATA" |
| 257 | " bits not supported for Block Discard" |
| 258 | " Emulation\n"); |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 259 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 260 | } |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 261 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
| 262 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", |
| 263 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); |
| 264 | return TCM_INVALID_CDB_FIELD; |
| 265 | } |
Roland Dreier | 5cb770b | 2013-10-14 15:49:23 -0700 | [diff] [blame^] | 266 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
| 267 | if (flags[0] & 0x10) { |
| 268 | pr_warn("WRITE SAME with ANCHOR not supported\n"); |
| 269 | return TCM_INVALID_CDB_FIELD; |
| 270 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 271 | /* |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 272 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| 273 | * translated into block discard requests within backend code. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 274 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 275 | if (flags[0] & 0x08) { |
| 276 | if (!ops->execute_write_same_unmap) |
| 277 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 278 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 279 | cmd->execute_cmd = ops->execute_write_same_unmap; |
| 280 | return 0; |
| 281 | } |
| 282 | if (!ops->execute_write_same) |
| 283 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 284 | |
| 285 | cmd->execute_cmd = ops->execute_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 286 | return 0; |
| 287 | } |
| 288 | |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 289 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 290 | { |
| 291 | unsigned char *buf, *addr; |
| 292 | struct scatterlist *sg; |
| 293 | unsigned int offset; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 294 | sense_reason_t ret = TCM_NO_SENSE; |
| 295 | int i, count; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 296 | /* |
| 297 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 298 | * |
| 299 | * 1) read the specified logical block(s); |
| 300 | * 2) transfer logical blocks from the data-out buffer; |
| 301 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 302 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 303 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 304 | * blocks transferred from the data-out buffer; and |
| 305 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 306 | */ |
| 307 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 308 | if (!buf) { |
| 309 | pr_err("Unable to allocate xor_callback buf\n"); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 310 | return TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 311 | } |
| 312 | /* |
| 313 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 314 | * into the locally allocated *buf |
| 315 | */ |
| 316 | sg_copy_to_buffer(cmd->t_data_sg, |
| 317 | cmd->t_data_nents, |
| 318 | buf, |
| 319 | cmd->data_length); |
| 320 | |
| 321 | /* |
| 322 | * Now perform the XOR against the BIDI read memory located at |
| 323 | * cmd->t_mem_bidi_list |
| 324 | */ |
| 325 | |
| 326 | offset = 0; |
| 327 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 328 | addr = kmap_atomic(sg_page(sg)); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 329 | if (!addr) { |
| 330 | ret = TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 331 | goto out; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 332 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 333 | |
| 334 | for (i = 0; i < sg->length; i++) |
| 335 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 336 | |
| 337 | offset += sg->length; |
| 338 | kunmap_atomic(addr); |
| 339 | } |
| 340 | |
| 341 | out: |
| 342 | kfree(buf); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 343 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 344 | } |
| 345 | |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 346 | static sense_reason_t |
| 347 | sbc_execute_rw(struct se_cmd *cmd) |
| 348 | { |
| 349 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, |
| 350 | cmd->data_direction); |
| 351 | } |
| 352 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 353 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
| 354 | { |
| 355 | struct se_device *dev = cmd->se_dev; |
| 356 | |
Nicholas Bellinger | d8855c1 | 2013-10-01 16:53:10 -0700 | [diff] [blame] | 357 | /* |
| 358 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through |
| 359 | * within target_complete_ok_work() if the command was successfully |
| 360 | * sent to the backend driver. |
| 361 | */ |
| 362 | spin_lock_irq(&cmd->t_state_lock); |
| 363 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) |
| 364 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
| 365 | spin_unlock_irq(&cmd->t_state_lock); |
| 366 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 367 | /* |
| 368 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() |
| 369 | * before the original READ I/O submission. |
| 370 | */ |
| 371 | up(&dev->caw_sem); |
| 372 | |
| 373 | return TCM_NO_SENSE; |
| 374 | } |
| 375 | |
| 376 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) |
| 377 | { |
| 378 | struct se_device *dev = cmd->se_dev; |
| 379 | struct scatterlist *write_sg = NULL, *sg; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 380 | unsigned char *buf = NULL, *addr; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 381 | struct sg_mapping_iter m; |
| 382 | unsigned int offset = 0, len; |
| 383 | unsigned int nlbas = cmd->t_task_nolb; |
| 384 | unsigned int block_size = dev->dev_attrib.block_size; |
| 385 | unsigned int compare_len = (nlbas * block_size); |
| 386 | sense_reason_t ret = TCM_NO_SENSE; |
| 387 | int rc, i; |
| 388 | |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 389 | /* |
| 390 | * Handle early failure in transport_generic_request_failure(), |
| 391 | * which will not have taken ->caw_mutex yet.. |
| 392 | */ |
| 393 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) |
| 394 | return TCM_NO_SENSE; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 395 | /* |
| 396 | * Immediately exit + release dev->caw_sem if command has already |
| 397 | * been failed with a non-zero SCSI status. |
| 398 | */ |
| 399 | if (cmd->scsi_status) { |
| 400 | pr_err("compare_and_write_callback: non zero scsi_status:" |
| 401 | " 0x%02x\n", cmd->scsi_status); |
| 402 | goto out; |
| 403 | } |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 404 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 405 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
| 406 | if (!buf) { |
| 407 | pr_err("Unable to allocate compare_and_write buf\n"); |
Nicholas Bellinger | a289008 | 2013-08-21 18:10:04 -0700 | [diff] [blame] | 408 | ret = TCM_OUT_OF_RESOURCES; |
| 409 | goto out; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 410 | } |
| 411 | |
| 412 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
| 413 | GFP_KERNEL); |
| 414 | if (!write_sg) { |
| 415 | pr_err("Unable to allocate compare_and_write sg\n"); |
| 416 | ret = TCM_OUT_OF_RESOURCES; |
| 417 | goto out; |
| 418 | } |
| 419 | /* |
| 420 | * Setup verify and write data payloads from total NumberLBAs. |
| 421 | */ |
| 422 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, |
| 423 | cmd->data_length); |
| 424 | if (!rc) { |
| 425 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); |
| 426 | ret = TCM_OUT_OF_RESOURCES; |
| 427 | goto out; |
| 428 | } |
| 429 | /* |
| 430 | * Compare against SCSI READ payload against verify payload |
| 431 | */ |
| 432 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { |
| 433 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); |
| 434 | if (!addr) { |
| 435 | ret = TCM_OUT_OF_RESOURCES; |
| 436 | goto out; |
| 437 | } |
| 438 | |
| 439 | len = min(sg->length, compare_len); |
| 440 | |
| 441 | if (memcmp(addr, buf + offset, len)) { |
| 442 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", |
| 443 | addr, buf + offset); |
| 444 | kunmap_atomic(addr); |
| 445 | goto miscompare; |
| 446 | } |
| 447 | kunmap_atomic(addr); |
| 448 | |
| 449 | offset += len; |
| 450 | compare_len -= len; |
| 451 | if (!compare_len) |
| 452 | break; |
| 453 | } |
| 454 | |
| 455 | i = 0; |
| 456 | len = cmd->t_task_nolb * block_size; |
| 457 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); |
| 458 | /* |
| 459 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. |
| 460 | */ |
| 461 | while (len) { |
| 462 | sg_miter_next(&m); |
| 463 | |
| 464 | if (block_size < PAGE_SIZE) { |
| 465 | sg_set_page(&write_sg[i], m.page, block_size, |
| 466 | block_size); |
| 467 | } else { |
| 468 | sg_miter_next(&m); |
| 469 | sg_set_page(&write_sg[i], m.page, block_size, |
| 470 | 0); |
| 471 | } |
| 472 | len -= block_size; |
| 473 | i++; |
| 474 | } |
| 475 | sg_miter_stop(&m); |
| 476 | /* |
| 477 | * Save the original SGL + nents values before updating to new |
| 478 | * assignments, to be released in transport_free_pages() -> |
| 479 | * transport_reset_sgl_orig() |
| 480 | */ |
| 481 | cmd->t_data_sg_orig = cmd->t_data_sg; |
| 482 | cmd->t_data_sg = write_sg; |
| 483 | cmd->t_data_nents_orig = cmd->t_data_nents; |
| 484 | cmd->t_data_nents = 1; |
| 485 | |
| 486 | cmd->sam_task_attr = MSG_HEAD_TAG; |
| 487 | cmd->transport_complete_callback = compare_and_write_post; |
| 488 | /* |
| 489 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler |
| 490 | * for submitting the adjusted SGL to write instance user-data. |
| 491 | */ |
| 492 | cmd->execute_cmd = sbc_execute_rw; |
| 493 | |
| 494 | spin_lock_irq(&cmd->t_state_lock); |
| 495 | cmd->t_state = TRANSPORT_PROCESSING; |
| 496 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
| 497 | spin_unlock_irq(&cmd->t_state_lock); |
| 498 | |
| 499 | __target_execute_cmd(cmd); |
| 500 | |
| 501 | kfree(buf); |
| 502 | return ret; |
| 503 | |
| 504 | miscompare: |
| 505 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", |
| 506 | dev->transport->name); |
| 507 | ret = TCM_MISCOMPARE_VERIFY; |
| 508 | out: |
| 509 | /* |
| 510 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in |
| 511 | * sbc_compare_and_write() before the original READ I/O submission. |
| 512 | */ |
| 513 | up(&dev->caw_sem); |
| 514 | kfree(write_sg); |
| 515 | kfree(buf); |
| 516 | return ret; |
| 517 | } |
| 518 | |
| 519 | static sense_reason_t |
| 520 | sbc_compare_and_write(struct se_cmd *cmd) |
| 521 | { |
| 522 | struct se_device *dev = cmd->se_dev; |
| 523 | sense_reason_t ret; |
| 524 | int rc; |
| 525 | /* |
| 526 | * Submit the READ first for COMPARE_AND_WRITE to perform the |
| 527 | * comparision using SGLs at cmd->t_bidi_data_sg.. |
| 528 | */ |
| 529 | rc = down_interruptible(&dev->caw_sem); |
| 530 | if ((rc != 0) || signal_pending(current)) { |
| 531 | cmd->transport_complete_callback = NULL; |
| 532 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 533 | } |
Nicholas Bellinger | b719125 | 2013-10-01 16:46:37 -0700 | [diff] [blame] | 534 | /* |
| 535 | * Reset cmd->data_length to individual block_size in order to not |
| 536 | * confuse backend drivers that depend on this value matching the |
| 537 | * size of the I/O being submitted. |
| 538 | */ |
| 539 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 540 | |
| 541 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
| 542 | DMA_FROM_DEVICE); |
| 543 | if (ret) { |
| 544 | cmd->transport_complete_callback = NULL; |
| 545 | up(&dev->caw_sem); |
| 546 | return ret; |
| 547 | } |
| 548 | /* |
| 549 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() |
| 550 | * upon MISCOMPARE, or in compare_and_write_done() upon completion |
| 551 | * of WRITE instance user-data. |
| 552 | */ |
| 553 | return TCM_NO_SENSE; |
| 554 | } |
| 555 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 556 | sense_reason_t |
| 557 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 558 | { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 559 | struct se_device *dev = cmd->se_dev; |
| 560 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 561 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 562 | u32 sectors = 0; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 563 | sense_reason_t ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 564 | |
| 565 | switch (cdb[0]) { |
| 566 | case READ_6: |
| 567 | sectors = transport_get_sectors_6(cdb); |
| 568 | cmd->t_task_lba = transport_lba_21(cdb); |
| 569 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 570 | cmd->execute_rw = ops->execute_rw; |
| 571 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 572 | break; |
| 573 | case READ_10: |
| 574 | sectors = transport_get_sectors_10(cdb); |
| 575 | cmd->t_task_lba = transport_lba_32(cdb); |
| 576 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 577 | cmd->execute_rw = ops->execute_rw; |
| 578 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 579 | break; |
| 580 | case READ_12: |
| 581 | sectors = transport_get_sectors_12(cdb); |
| 582 | cmd->t_task_lba = transport_lba_32(cdb); |
| 583 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 584 | cmd->execute_rw = ops->execute_rw; |
| 585 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 586 | break; |
| 587 | case READ_16: |
| 588 | sectors = transport_get_sectors_16(cdb); |
| 589 | cmd->t_task_lba = transport_lba_64(cdb); |
| 590 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 591 | cmd->execute_rw = ops->execute_rw; |
| 592 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 593 | break; |
| 594 | case WRITE_6: |
| 595 | sectors = transport_get_sectors_6(cdb); |
| 596 | cmd->t_task_lba = transport_lba_21(cdb); |
| 597 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 598 | cmd->execute_rw = ops->execute_rw; |
| 599 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 600 | break; |
| 601 | case WRITE_10: |
| 602 | case WRITE_VERIFY: |
| 603 | sectors = transport_get_sectors_10(cdb); |
| 604 | cmd->t_task_lba = transport_lba_32(cdb); |
| 605 | if (cdb[1] & 0x8) |
| 606 | cmd->se_cmd_flags |= SCF_FUA; |
| 607 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 608 | cmd->execute_rw = ops->execute_rw; |
| 609 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 610 | break; |
| 611 | case WRITE_12: |
| 612 | sectors = transport_get_sectors_12(cdb); |
| 613 | cmd->t_task_lba = transport_lba_32(cdb); |
| 614 | if (cdb[1] & 0x8) |
| 615 | cmd->se_cmd_flags |= SCF_FUA; |
| 616 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 617 | cmd->execute_rw = ops->execute_rw; |
| 618 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 619 | break; |
| 620 | case WRITE_16: |
| 621 | sectors = transport_get_sectors_16(cdb); |
| 622 | cmd->t_task_lba = transport_lba_64(cdb); |
| 623 | if (cdb[1] & 0x8) |
| 624 | cmd->se_cmd_flags |= SCF_FUA; |
| 625 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 626 | cmd->execute_rw = ops->execute_rw; |
| 627 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 628 | break; |
| 629 | case XDWRITEREAD_10: |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 630 | if (cmd->data_direction != DMA_TO_DEVICE || |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 631 | !(cmd->se_cmd_flags & SCF_BIDI)) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 632 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 633 | sectors = transport_get_sectors_10(cdb); |
| 634 | |
| 635 | cmd->t_task_lba = transport_lba_32(cdb); |
| 636 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 637 | |
| 638 | /* |
| 639 | * Setup BIDI XOR callback to be run after I/O completion. |
| 640 | */ |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 641 | cmd->execute_rw = ops->execute_rw; |
| 642 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 643 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 644 | if (cdb[1] & 0x8) |
| 645 | cmd->se_cmd_flags |= SCF_FUA; |
| 646 | break; |
| 647 | case VARIABLE_LENGTH_CMD: |
| 648 | { |
| 649 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 650 | switch (service_action) { |
| 651 | case XDWRITEREAD_32: |
| 652 | sectors = transport_get_sectors_32(cdb); |
| 653 | |
| 654 | /* |
| 655 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 656 | * XDWRITE_READ_32 logic. |
| 657 | */ |
| 658 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
| 659 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 660 | |
| 661 | /* |
| 662 | * Setup BIDI XOR callback to be run during after I/O |
| 663 | * completion. |
| 664 | */ |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 665 | cmd->execute_rw = ops->execute_rw; |
| 666 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 667 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 668 | if (cdb[1] & 0x8) |
| 669 | cmd->se_cmd_flags |= SCF_FUA; |
| 670 | break; |
| 671 | case WRITE_SAME_32: |
| 672 | sectors = transport_get_sectors_32(cdb); |
| 673 | if (!sectors) { |
| 674 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 675 | " supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 676 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 677 | } |
| 678 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 679 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 680 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 681 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 682 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 683 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 684 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 685 | break; |
| 686 | default: |
| 687 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 688 | " 0x%04x not supported\n", service_action); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 689 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 690 | } |
| 691 | break; |
| 692 | } |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 693 | case COMPARE_AND_WRITE: |
| 694 | sectors = cdb[13]; |
| 695 | /* |
| 696 | * Currently enforce COMPARE_AND_WRITE for a single sector |
| 697 | */ |
| 698 | if (sectors > 1) { |
| 699 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" |
| 700 | " than 1\n", sectors); |
| 701 | return TCM_INVALID_CDB_FIELD; |
| 702 | } |
| 703 | /* |
| 704 | * Double size because we have two buffers, note that |
| 705 | * zero is not an error.. |
| 706 | */ |
| 707 | size = 2 * sbc_get_size(cmd, sectors); |
| 708 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 709 | cmd->t_task_nolb = sectors; |
| 710 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; |
| 711 | cmd->execute_rw = ops->execute_rw; |
| 712 | cmd->execute_cmd = sbc_compare_and_write; |
| 713 | cmd->transport_complete_callback = compare_and_write_callback; |
| 714 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 715 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 716 | size = READ_CAP_LEN; |
| 717 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 718 | break; |
| 719 | case SERVICE_ACTION_IN: |
| 720 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 721 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 722 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 723 | break; |
| 724 | default: |
| 725 | pr_err("Unsupported SA: 0x%02x\n", |
| 726 | cmd->t_task_cdb[1] & 0x1f); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 727 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 728 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 729 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 730 | (cdb[12] << 8) | cdb[13]; |
| 731 | break; |
| 732 | case SYNCHRONIZE_CACHE: |
| 733 | case SYNCHRONIZE_CACHE_16: |
Hannes Reinecke | 882e3f8 | 2013-03-04 14:08:06 +0100 | [diff] [blame] | 734 | if (!ops->execute_sync_cache) { |
| 735 | size = 0; |
| 736 | cmd->execute_cmd = sbc_emulate_noop; |
| 737 | break; |
| 738 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 739 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 740 | /* |
| 741 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE |
| 742 | */ |
| 743 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 744 | sectors = transport_get_sectors_10(cdb); |
| 745 | cmd->t_task_lba = transport_lba_32(cdb); |
| 746 | } else { |
| 747 | sectors = transport_get_sectors_16(cdb); |
| 748 | cmd->t_task_lba = transport_lba_64(cdb); |
| 749 | } |
| 750 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 751 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 752 | |
| 753 | /* |
| 754 | * Check to ensure that LBA + Range does not exceed past end of |
| 755 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
| 756 | */ |
| 757 | if (cmd->t_task_lba || sectors) { |
| 758 | if (sbc_check_valid_sectors(cmd) < 0) |
Roland Dreier | 3363367 | 2013-02-08 15:18:38 -0800 | [diff] [blame] | 759 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 760 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 761 | cmd->execute_cmd = ops->execute_sync_cache; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 762 | break; |
| 763 | case UNMAP: |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 764 | if (!ops->execute_unmap) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 765 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 766 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 767 | size = get_unaligned_be16(&cdb[7]); |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 768 | cmd->execute_cmd = ops->execute_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 769 | break; |
| 770 | case WRITE_SAME_16: |
| 771 | sectors = transport_get_sectors_16(cdb); |
| 772 | if (!sectors) { |
| 773 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 774 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 775 | } |
| 776 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 777 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 778 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 779 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 780 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 781 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 782 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 783 | break; |
| 784 | case WRITE_SAME: |
| 785 | sectors = transport_get_sectors_10(cdb); |
| 786 | if (!sectors) { |
| 787 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 788 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 789 | } |
| 790 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 791 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 792 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
| 793 | |
| 794 | /* |
| 795 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence |
| 796 | * of byte 1 bit 3 UNMAP instead of original reserved field |
| 797 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 798 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 799 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 800 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 801 | break; |
| 802 | case VERIFY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 803 | size = 0; |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 804 | cmd->execute_cmd = sbc_emulate_noop; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 805 | break; |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 806 | case REZERO_UNIT: |
| 807 | case SEEK_6: |
| 808 | case SEEK_10: |
| 809 | /* |
| 810 | * There are still clients out there which use these old SCSI-2 |
| 811 | * commands. This mainly happens when running VMs with legacy |
| 812 | * guest systems, connected via SCSI command pass-through to |
| 813 | * iSCSI targets. Make them happy and return status GOOD. |
| 814 | */ |
| 815 | size = 0; |
| 816 | cmd->execute_cmd = sbc_emulate_noop; |
| 817 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 818 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 819 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 820 | if (ret) |
| 821 | return ret; |
| 822 | } |
| 823 | |
| 824 | /* reject any command that we don't have a handler for */ |
| 825 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 826 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 827 | |
| 828 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 829 | unsigned long long end_lba; |
| 830 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 831 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 832 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 833 | " big sectors %u exceeds fabric_max_sectors:" |
| 834 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 835 | dev->dev_attrib.fabric_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 836 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 837 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 838 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 839 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 840 | " big sectors %u exceeds backend hw_max_sectors:" |
| 841 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 842 | dev->dev_attrib.hw_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 843 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 844 | } |
| 845 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 846 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 847 | if (cmd->t_task_lba + sectors > end_lba) { |
| 848 | pr_err("cmd exceeds last lba %llu " |
| 849 | "(lba %llu, sectors %u)\n", |
| 850 | end_lba, cmd->t_task_lba, sectors); |
Roland Dreier | 09ceadc | 2013-06-26 17:36:18 -0700 | [diff] [blame] | 851 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 852 | } |
| 853 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 854 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
| 855 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 856 | } |
| 857 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 858 | return target_cmd_size_check(cmd, size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 859 | } |
| 860 | EXPORT_SYMBOL(sbc_parse_cdb); |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 861 | |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 862 | u32 sbc_get_device_type(struct se_device *dev) |
| 863 | { |
| 864 | return TYPE_DISK; |
| 865 | } |
| 866 | EXPORT_SYMBOL(sbc_get_device_type); |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 867 | |
| 868 | sense_reason_t |
| 869 | sbc_execute_unmap(struct se_cmd *cmd, |
| 870 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, |
| 871 | sector_t, sector_t), |
| 872 | void *priv) |
| 873 | { |
| 874 | struct se_device *dev = cmd->se_dev; |
| 875 | unsigned char *buf, *ptr = NULL; |
| 876 | sector_t lba; |
| 877 | int size; |
| 878 | u32 range; |
| 879 | sense_reason_t ret = 0; |
| 880 | int dl, bd_dl; |
| 881 | |
| 882 | /* We never set ANC_SUP */ |
| 883 | if (cmd->t_task_cdb[1]) |
| 884 | return TCM_INVALID_CDB_FIELD; |
| 885 | |
| 886 | if (cmd->data_length == 0) { |
| 887 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 888 | return 0; |
| 889 | } |
| 890 | |
| 891 | if (cmd->data_length < 8) { |
| 892 | pr_warn("UNMAP parameter list length %u too small\n", |
| 893 | cmd->data_length); |
| 894 | return TCM_PARAMETER_LIST_LENGTH_ERROR; |
| 895 | } |
| 896 | |
| 897 | buf = transport_kmap_data_sg(cmd); |
| 898 | if (!buf) |
| 899 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 900 | |
| 901 | dl = get_unaligned_be16(&buf[0]); |
| 902 | bd_dl = get_unaligned_be16(&buf[2]); |
| 903 | |
| 904 | size = cmd->data_length - 8; |
| 905 | if (bd_dl > size) |
| 906 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", |
| 907 | cmd->data_length, bd_dl); |
| 908 | else |
| 909 | size = bd_dl; |
| 910 | |
| 911 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
| 912 | ret = TCM_INVALID_PARAMETER_LIST; |
| 913 | goto err; |
| 914 | } |
| 915 | |
| 916 | /* First UNMAP block descriptor starts at 8 byte offset */ |
| 917 | ptr = &buf[8]; |
| 918 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" |
| 919 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
| 920 | |
| 921 | while (size >= 16) { |
| 922 | lba = get_unaligned_be64(&ptr[0]); |
| 923 | range = get_unaligned_be32(&ptr[8]); |
| 924 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", |
| 925 | (unsigned long long)lba, range); |
| 926 | |
| 927 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
| 928 | ret = TCM_INVALID_PARAMETER_LIST; |
| 929 | goto err; |
| 930 | } |
| 931 | |
| 932 | if (lba + range > dev->transport->get_blocks(dev) + 1) { |
| 933 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
| 934 | goto err; |
| 935 | } |
| 936 | |
| 937 | ret = do_unmap_fn(cmd, priv, lba, range); |
| 938 | if (ret) |
| 939 | goto err; |
| 940 | |
| 941 | ptr += 16; |
| 942 | size -= 16; |
| 943 | } |
| 944 | |
| 945 | err: |
| 946 | transport_kunmap_data_sg(cmd); |
| 947 | if (!ret) |
| 948 | target_complete_cmd(cmd, GOOD); |
| 949 | return ret; |
| 950 | } |
| 951 | EXPORT_SYMBOL(sbc_execute_unmap); |