Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * SCSI Block Commands (SBC) parsing and emulation. |
| 3 | * |
Nicholas Bellinger | fd9a11d | 2012-11-09 14:51:48 -0800 | [diff] [blame] | 4 | * (c) Copyright 2002-2012 RisingTide Systems LLC. |
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> |
| 28 | |
| 29 | #include <target/target_core_base.h> |
| 30 | #include <target/target_core_backend.h> |
| 31 | #include <target/target_core_fabric.h> |
| 32 | |
| 33 | #include "target_core_internal.h" |
| 34 | #include "target_core_ua.h" |
| 35 | |
| 36 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 37 | static sense_reason_t |
| 38 | sbc_emulate_readcapacity(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 39 | { |
| 40 | struct se_device *dev = cmd->se_dev; |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 41 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 42 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 43 | unsigned char *rbuf; |
| 44 | unsigned char buf[8]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 45 | u32 blocks; |
| 46 | |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 47 | /* |
| 48 | * SBC-2 says: |
| 49 | * If the PMI bit is set to zero and the LOGICAL BLOCK |
| 50 | * ADDRESS field is not set to zero, the device server shall |
| 51 | * terminate the command with CHECK CONDITION status with |
| 52 | * the sense key set to ILLEGAL REQUEST and the additional |
| 53 | * sense code set to INVALID FIELD IN CDB. |
| 54 | * |
| 55 | * In SBC-3, these fields are obsolete, but some SCSI |
| 56 | * compliance tests actually check this, so we might as well |
| 57 | * follow SBC-2. |
| 58 | */ |
| 59 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) |
| 60 | return TCM_INVALID_CDB_FIELD; |
| 61 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 62 | if (blocks_long >= 0x00000000ffffffff) |
| 63 | blocks = 0xffffffff; |
| 64 | else |
| 65 | blocks = (u32)blocks_long; |
| 66 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 67 | buf[0] = (blocks >> 24) & 0xff; |
| 68 | buf[1] = (blocks >> 16) & 0xff; |
| 69 | buf[2] = (blocks >> 8) & 0xff; |
| 70 | buf[3] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 71 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 72 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 73 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 74 | buf[7] = dev->dev_attrib.block_size & 0xff; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 75 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 76 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 77 | if (rbuf) { |
| 78 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 79 | transport_kunmap_data_sg(cmd); |
| 80 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 81 | |
| 82 | target_complete_cmd(cmd, GOOD); |
| 83 | return 0; |
| 84 | } |
| 85 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 86 | static sense_reason_t |
| 87 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 88 | { |
| 89 | struct se_device *dev = cmd->se_dev; |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 90 | unsigned char *rbuf; |
| 91 | unsigned char buf[32]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 92 | unsigned long long blocks = dev->transport->get_blocks(dev); |
| 93 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 94 | memset(buf, 0, sizeof(buf)); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 95 | buf[0] = (blocks >> 56) & 0xff; |
| 96 | buf[1] = (blocks >> 48) & 0xff; |
| 97 | buf[2] = (blocks >> 40) & 0xff; |
| 98 | buf[3] = (blocks >> 32) & 0xff; |
| 99 | buf[4] = (blocks >> 24) & 0xff; |
| 100 | buf[5] = (blocks >> 16) & 0xff; |
| 101 | buf[6] = (blocks >> 8) & 0xff; |
| 102 | buf[7] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 103 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 104 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 105 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 106 | buf[11] = dev->dev_attrib.block_size & 0xff; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 107 | /* |
| 108 | * Set Thin Provisioning Enable bit following sbc3r22 in section |
| 109 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. |
| 110 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 111 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 112 | buf[14] = 0x80; |
| 113 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 114 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 115 | if (rbuf) { |
| 116 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 117 | transport_kunmap_data_sg(cmd); |
| 118 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 119 | |
| 120 | target_complete_cmd(cmd, GOOD); |
| 121 | return 0; |
| 122 | } |
| 123 | |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 124 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 125 | { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 126 | u32 num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 127 | |
| 128 | if (cmd->t_task_cdb[0] == WRITE_SAME) |
| 129 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); |
| 130 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) |
| 131 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); |
| 132 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ |
| 133 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); |
| 134 | |
| 135 | /* |
| 136 | * Use the explicit range when non zero is supplied, otherwise calculate |
| 137 | * the remaining range based on ->get_blocks() - starting LBA. |
| 138 | */ |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 139 | if (num_blocks) |
| 140 | return num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 141 | |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 142 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
| 143 | cmd->t_task_lba + 1; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 144 | } |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 145 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 146 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 147 | static sense_reason_t |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 148 | sbc_emulate_noop(struct se_cmd *cmd) |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 149 | { |
| 150 | target_complete_cmd(cmd, GOOD); |
| 151 | return 0; |
| 152 | } |
| 153 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 154 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| 155 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 156 | return cmd->se_dev->dev_attrib.block_size * sectors; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | static int sbc_check_valid_sectors(struct se_cmd *cmd) |
| 160 | { |
| 161 | struct se_device *dev = cmd->se_dev; |
| 162 | unsigned long long end_lba; |
| 163 | u32 sectors; |
| 164 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 165 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 166 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 167 | |
| 168 | if (cmd->t_task_lba + sectors > end_lba) { |
| 169 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", |
| 170 | cmd->t_task_lba, sectors, end_lba); |
| 171 | return -EINVAL; |
| 172 | } |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| 178 | { |
| 179 | /* |
| 180 | * Use 8-bit sector value. SBC-3 says: |
| 181 | * |
| 182 | * A TRANSFER LENGTH field set to zero specifies that 256 |
| 183 | * logical blocks shall be written. Any other value |
| 184 | * specifies the number of logical blocks that shall be |
| 185 | * written. |
| 186 | */ |
| 187 | return cdb[4] ? : 256; |
| 188 | } |
| 189 | |
| 190 | static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| 191 | { |
| 192 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 193 | } |
| 194 | |
| 195 | static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| 196 | { |
| 197 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 198 | } |
| 199 | |
| 200 | static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| 201 | { |
| 202 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 203 | (cdb[12] << 8) + cdb[13]; |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 208 | */ |
| 209 | static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| 210 | { |
| 211 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 212 | (cdb[30] << 8) + cdb[31]; |
| 213 | |
| 214 | } |
| 215 | |
| 216 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 217 | { |
| 218 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 219 | } |
| 220 | |
| 221 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 222 | { |
| 223 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 224 | } |
| 225 | |
| 226 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 227 | { |
| 228 | unsigned int __v1, __v2; |
| 229 | |
| 230 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 231 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 232 | |
| 233 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 238 | */ |
| 239 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 240 | { |
| 241 | unsigned int __v1, __v2; |
| 242 | |
| 243 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 244 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 245 | |
| 246 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 247 | } |
| 248 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 249 | static sense_reason_t |
| 250 | 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] | 251 | { |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 252 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 253 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 254 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| 255 | pr_err("WRITE_SAME PBDATA and LBDATA" |
| 256 | " bits not supported for Block Discard" |
| 257 | " Emulation\n"); |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 258 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 259 | } |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 260 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
| 261 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", |
| 262 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); |
| 263 | return TCM_INVALID_CDB_FIELD; |
| 264 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 265 | /* |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 266 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| 267 | * translated into block discard requests within backend code. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 268 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 269 | if (flags[0] & 0x08) { |
| 270 | if (!ops->execute_write_same_unmap) |
| 271 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 272 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 273 | cmd->execute_cmd = ops->execute_write_same_unmap; |
| 274 | return 0; |
| 275 | } |
| 276 | if (!ops->execute_write_same) |
| 277 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 278 | |
| 279 | cmd->execute_cmd = ops->execute_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | static void xdreadwrite_callback(struct se_cmd *cmd) |
| 284 | { |
| 285 | unsigned char *buf, *addr; |
| 286 | struct scatterlist *sg; |
| 287 | unsigned int offset; |
| 288 | int i; |
| 289 | int count; |
| 290 | /* |
| 291 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 292 | * |
| 293 | * 1) read the specified logical block(s); |
| 294 | * 2) transfer logical blocks from the data-out buffer; |
| 295 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 296 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 297 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 298 | * blocks transferred from the data-out buffer; and |
| 299 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 300 | */ |
| 301 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 302 | if (!buf) { |
| 303 | pr_err("Unable to allocate xor_callback buf\n"); |
| 304 | return; |
| 305 | } |
| 306 | /* |
| 307 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 308 | * into the locally allocated *buf |
| 309 | */ |
| 310 | sg_copy_to_buffer(cmd->t_data_sg, |
| 311 | cmd->t_data_nents, |
| 312 | buf, |
| 313 | cmd->data_length); |
| 314 | |
| 315 | /* |
| 316 | * Now perform the XOR against the BIDI read memory located at |
| 317 | * cmd->t_mem_bidi_list |
| 318 | */ |
| 319 | |
| 320 | offset = 0; |
| 321 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 322 | addr = kmap_atomic(sg_page(sg)); |
| 323 | if (!addr) |
| 324 | goto out; |
| 325 | |
| 326 | for (i = 0; i < sg->length; i++) |
| 327 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 328 | |
| 329 | offset += sg->length; |
| 330 | kunmap_atomic(addr); |
| 331 | } |
| 332 | |
| 333 | out: |
| 334 | kfree(buf); |
| 335 | } |
| 336 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 337 | sense_reason_t |
| 338 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 339 | { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 340 | struct se_device *dev = cmd->se_dev; |
| 341 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 342 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 343 | u32 sectors = 0; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 344 | sense_reason_t ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 345 | |
| 346 | switch (cdb[0]) { |
| 347 | case READ_6: |
| 348 | sectors = transport_get_sectors_6(cdb); |
| 349 | cmd->t_task_lba = transport_lba_21(cdb); |
| 350 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 351 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 352 | break; |
| 353 | case READ_10: |
| 354 | sectors = transport_get_sectors_10(cdb); |
| 355 | cmd->t_task_lba = transport_lba_32(cdb); |
| 356 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 357 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 358 | break; |
| 359 | case READ_12: |
| 360 | sectors = transport_get_sectors_12(cdb); |
| 361 | cmd->t_task_lba = transport_lba_32(cdb); |
| 362 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 363 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 364 | break; |
| 365 | case READ_16: |
| 366 | sectors = transport_get_sectors_16(cdb); |
| 367 | cmd->t_task_lba = transport_lba_64(cdb); |
| 368 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 369 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 370 | break; |
| 371 | case WRITE_6: |
| 372 | sectors = transport_get_sectors_6(cdb); |
| 373 | cmd->t_task_lba = transport_lba_21(cdb); |
| 374 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 375 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 376 | break; |
| 377 | case WRITE_10: |
| 378 | case WRITE_VERIFY: |
| 379 | sectors = transport_get_sectors_10(cdb); |
| 380 | cmd->t_task_lba = transport_lba_32(cdb); |
| 381 | if (cdb[1] & 0x8) |
| 382 | cmd->se_cmd_flags |= SCF_FUA; |
| 383 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 384 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 385 | break; |
| 386 | case WRITE_12: |
| 387 | sectors = transport_get_sectors_12(cdb); |
| 388 | cmd->t_task_lba = transport_lba_32(cdb); |
| 389 | if (cdb[1] & 0x8) |
| 390 | cmd->se_cmd_flags |= SCF_FUA; |
| 391 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 392 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 393 | break; |
| 394 | case WRITE_16: |
| 395 | sectors = transport_get_sectors_16(cdb); |
| 396 | cmd->t_task_lba = transport_lba_64(cdb); |
| 397 | if (cdb[1] & 0x8) |
| 398 | cmd->se_cmd_flags |= SCF_FUA; |
| 399 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 400 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 401 | break; |
| 402 | case XDWRITEREAD_10: |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 403 | if (cmd->data_direction != DMA_TO_DEVICE || |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 404 | !(cmd->se_cmd_flags & SCF_BIDI)) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 405 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 406 | sectors = transport_get_sectors_10(cdb); |
| 407 | |
| 408 | cmd->t_task_lba = transport_lba_32(cdb); |
| 409 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 410 | |
| 411 | /* |
| 412 | * Setup BIDI XOR callback to be run after I/O completion. |
| 413 | */ |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 414 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 415 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 416 | if (cdb[1] & 0x8) |
| 417 | cmd->se_cmd_flags |= SCF_FUA; |
| 418 | break; |
| 419 | case VARIABLE_LENGTH_CMD: |
| 420 | { |
| 421 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 422 | switch (service_action) { |
| 423 | case XDWRITEREAD_32: |
| 424 | sectors = transport_get_sectors_32(cdb); |
| 425 | |
| 426 | /* |
| 427 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 428 | * XDWRITE_READ_32 logic. |
| 429 | */ |
| 430 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
| 431 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 432 | |
| 433 | /* |
| 434 | * Setup BIDI XOR callback to be run during after I/O |
| 435 | * completion. |
| 436 | */ |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 437 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 438 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 439 | if (cdb[1] & 0x8) |
| 440 | cmd->se_cmd_flags |= SCF_FUA; |
| 441 | break; |
| 442 | case WRITE_SAME_32: |
| 443 | sectors = transport_get_sectors_32(cdb); |
| 444 | if (!sectors) { |
| 445 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 446 | " supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 447 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 448 | } |
| 449 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 450 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 451 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 452 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 453 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 454 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 455 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 456 | break; |
| 457 | default: |
| 458 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 459 | " 0x%04x not supported\n", service_action); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 460 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 461 | } |
| 462 | break; |
| 463 | } |
| 464 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 465 | size = READ_CAP_LEN; |
| 466 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 467 | break; |
| 468 | case SERVICE_ACTION_IN: |
| 469 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 470 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 471 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 472 | break; |
| 473 | default: |
| 474 | pr_err("Unsupported SA: 0x%02x\n", |
| 475 | cmd->t_task_cdb[1] & 0x1f); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 476 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 477 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 478 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 479 | (cdb[12] << 8) | cdb[13]; |
| 480 | break; |
| 481 | case SYNCHRONIZE_CACHE: |
| 482 | case SYNCHRONIZE_CACHE_16: |
Hannes Reinecke | 882e3f8 | 2013-03-04 14:08:06 +0100 | [diff] [blame] | 483 | if (!ops->execute_sync_cache) { |
| 484 | size = 0; |
| 485 | cmd->execute_cmd = sbc_emulate_noop; |
| 486 | break; |
| 487 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 488 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 489 | /* |
| 490 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE |
| 491 | */ |
| 492 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 493 | sectors = transport_get_sectors_10(cdb); |
| 494 | cmd->t_task_lba = transport_lba_32(cdb); |
| 495 | } else { |
| 496 | sectors = transport_get_sectors_16(cdb); |
| 497 | cmd->t_task_lba = transport_lba_64(cdb); |
| 498 | } |
| 499 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 500 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 501 | |
| 502 | /* |
| 503 | * Check to ensure that LBA + Range does not exceed past end of |
| 504 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
| 505 | */ |
| 506 | if (cmd->t_task_lba || sectors) { |
| 507 | if (sbc_check_valid_sectors(cmd) < 0) |
Roland Dreier | 3363367 | 2013-02-08 15:18:38 -0800 | [diff] [blame] | 508 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 509 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 510 | cmd->execute_cmd = ops->execute_sync_cache; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 511 | break; |
| 512 | case UNMAP: |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 513 | if (!ops->execute_unmap) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 514 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 515 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 516 | size = get_unaligned_be16(&cdb[7]); |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 517 | cmd->execute_cmd = ops->execute_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 518 | break; |
| 519 | case WRITE_SAME_16: |
| 520 | sectors = transport_get_sectors_16(cdb); |
| 521 | if (!sectors) { |
| 522 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 523 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 524 | } |
| 525 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 526 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 527 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 528 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 529 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 530 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 531 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 532 | break; |
| 533 | case WRITE_SAME: |
| 534 | sectors = transport_get_sectors_10(cdb); |
| 535 | if (!sectors) { |
| 536 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 537 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 538 | } |
| 539 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 540 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 541 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
| 542 | |
| 543 | /* |
| 544 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence |
| 545 | * of byte 1 bit 3 UNMAP instead of original reserved field |
| 546 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 547 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 548 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 549 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 550 | break; |
| 551 | case VERIFY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 552 | size = 0; |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 553 | cmd->execute_cmd = sbc_emulate_noop; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 554 | break; |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 555 | case REZERO_UNIT: |
| 556 | case SEEK_6: |
| 557 | case SEEK_10: |
| 558 | /* |
| 559 | * There are still clients out there which use these old SCSI-2 |
| 560 | * commands. This mainly happens when running VMs with legacy |
| 561 | * guest systems, connected via SCSI command pass-through to |
| 562 | * iSCSI targets. Make them happy and return status GOOD. |
| 563 | */ |
| 564 | size = 0; |
| 565 | cmd->execute_cmd = sbc_emulate_noop; |
| 566 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 567 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 568 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 569 | if (ret) |
| 570 | return ret; |
| 571 | } |
| 572 | |
| 573 | /* reject any command that we don't have a handler for */ |
| 574 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 575 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 576 | |
| 577 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 578 | unsigned long long end_lba; |
| 579 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 580 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 581 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 582 | " big sectors %u exceeds fabric_max_sectors:" |
| 583 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 584 | dev->dev_attrib.fabric_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 585 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 586 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 587 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 588 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 589 | " big sectors %u exceeds backend hw_max_sectors:" |
| 590 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 591 | dev->dev_attrib.hw_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 592 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 593 | } |
| 594 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 595 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 596 | if (cmd->t_task_lba + sectors > end_lba) { |
| 597 | pr_err("cmd exceeds last lba %llu " |
| 598 | "(lba %llu, sectors %u)\n", |
| 599 | end_lba, cmd->t_task_lba, sectors); |
Roland Dreier | 09ceadc | 2013-06-26 17:36:18 -0700 | [diff] [blame] | 600 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 601 | } |
| 602 | |
| 603 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 604 | } |
| 605 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 606 | return target_cmd_size_check(cmd, size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 607 | } |
| 608 | EXPORT_SYMBOL(sbc_parse_cdb); |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 609 | |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 610 | u32 sbc_get_device_type(struct se_device *dev) |
| 611 | { |
| 612 | return TYPE_DISK; |
| 613 | } |
| 614 | EXPORT_SYMBOL(sbc_get_device_type); |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 615 | |
| 616 | sense_reason_t |
| 617 | sbc_execute_unmap(struct se_cmd *cmd, |
| 618 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, |
| 619 | sector_t, sector_t), |
| 620 | void *priv) |
| 621 | { |
| 622 | struct se_device *dev = cmd->se_dev; |
| 623 | unsigned char *buf, *ptr = NULL; |
| 624 | sector_t lba; |
| 625 | int size; |
| 626 | u32 range; |
| 627 | sense_reason_t ret = 0; |
| 628 | int dl, bd_dl; |
| 629 | |
| 630 | /* We never set ANC_SUP */ |
| 631 | if (cmd->t_task_cdb[1]) |
| 632 | return TCM_INVALID_CDB_FIELD; |
| 633 | |
| 634 | if (cmd->data_length == 0) { |
| 635 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 636 | return 0; |
| 637 | } |
| 638 | |
| 639 | if (cmd->data_length < 8) { |
| 640 | pr_warn("UNMAP parameter list length %u too small\n", |
| 641 | cmd->data_length); |
| 642 | return TCM_PARAMETER_LIST_LENGTH_ERROR; |
| 643 | } |
| 644 | |
| 645 | buf = transport_kmap_data_sg(cmd); |
| 646 | if (!buf) |
| 647 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 648 | |
| 649 | dl = get_unaligned_be16(&buf[0]); |
| 650 | bd_dl = get_unaligned_be16(&buf[2]); |
| 651 | |
| 652 | size = cmd->data_length - 8; |
| 653 | if (bd_dl > size) |
| 654 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", |
| 655 | cmd->data_length, bd_dl); |
| 656 | else |
| 657 | size = bd_dl; |
| 658 | |
| 659 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
| 660 | ret = TCM_INVALID_PARAMETER_LIST; |
| 661 | goto err; |
| 662 | } |
| 663 | |
| 664 | /* First UNMAP block descriptor starts at 8 byte offset */ |
| 665 | ptr = &buf[8]; |
| 666 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" |
| 667 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
| 668 | |
| 669 | while (size >= 16) { |
| 670 | lba = get_unaligned_be64(&ptr[0]); |
| 671 | range = get_unaligned_be32(&ptr[8]); |
| 672 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", |
| 673 | (unsigned long long)lba, range); |
| 674 | |
| 675 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
| 676 | ret = TCM_INVALID_PARAMETER_LIST; |
| 677 | goto err; |
| 678 | } |
| 679 | |
| 680 | if (lba + range > dev->transport->get_blocks(dev) + 1) { |
| 681 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
| 682 | goto err; |
| 683 | } |
| 684 | |
| 685 | ret = do_unmap_fn(cmd, priv, lba, range); |
| 686 | if (ret) |
| 687 | goto err; |
| 688 | |
| 689 | ptr += 16; |
| 690 | size -= 16; |
| 691 | } |
| 692 | |
| 693 | err: |
| 694 | transport_kunmap_data_sg(cmd); |
| 695 | if (!ret) |
| 696 | target_complete_cmd(cmd, GOOD); |
| 697 | return ret; |
| 698 | } |
| 699 | EXPORT_SYMBOL(sbc_execute_unmap); |