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 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 266 | /* |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 267 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| 268 | * translated into block discard requests within backend code. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 269 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 270 | if (flags[0] & 0x08) { |
| 271 | if (!ops->execute_write_same_unmap) |
| 272 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 273 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 274 | cmd->execute_cmd = ops->execute_write_same_unmap; |
| 275 | return 0; |
| 276 | } |
| 277 | if (!ops->execute_write_same) |
| 278 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 279 | |
| 280 | cmd->execute_cmd = ops->execute_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 281 | return 0; |
| 282 | } |
| 283 | |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 284 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 285 | { |
| 286 | unsigned char *buf, *addr; |
| 287 | struct scatterlist *sg; |
| 288 | unsigned int offset; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 289 | sense_reason_t ret = TCM_NO_SENSE; |
| 290 | int i, count; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 291 | /* |
| 292 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 293 | * |
| 294 | * 1) read the specified logical block(s); |
| 295 | * 2) transfer logical blocks from the data-out buffer; |
| 296 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 297 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 298 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 299 | * blocks transferred from the data-out buffer; and |
| 300 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 301 | */ |
| 302 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 303 | if (!buf) { |
| 304 | pr_err("Unable to allocate xor_callback buf\n"); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 305 | return TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 306 | } |
| 307 | /* |
| 308 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 309 | * into the locally allocated *buf |
| 310 | */ |
| 311 | sg_copy_to_buffer(cmd->t_data_sg, |
| 312 | cmd->t_data_nents, |
| 313 | buf, |
| 314 | cmd->data_length); |
| 315 | |
| 316 | /* |
| 317 | * Now perform the XOR against the BIDI read memory located at |
| 318 | * cmd->t_mem_bidi_list |
| 319 | */ |
| 320 | |
| 321 | offset = 0; |
| 322 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 323 | addr = kmap_atomic(sg_page(sg)); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 324 | if (!addr) { |
| 325 | ret = TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 326 | goto out; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 327 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 328 | |
| 329 | for (i = 0; i < sg->length; i++) |
| 330 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 331 | |
| 332 | offset += sg->length; |
| 333 | kunmap_atomic(addr); |
| 334 | } |
| 335 | |
| 336 | out: |
| 337 | kfree(buf); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 338 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 339 | } |
| 340 | |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 341 | static sense_reason_t |
| 342 | sbc_execute_rw(struct se_cmd *cmd) |
| 343 | { |
| 344 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, |
| 345 | cmd->data_direction); |
| 346 | } |
| 347 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 348 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
| 349 | { |
| 350 | struct se_device *dev = cmd->se_dev; |
| 351 | |
| 352 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
| 353 | /* |
| 354 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() |
| 355 | * before the original READ I/O submission. |
| 356 | */ |
| 357 | up(&dev->caw_sem); |
| 358 | |
| 359 | return TCM_NO_SENSE; |
| 360 | } |
| 361 | |
| 362 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) |
| 363 | { |
| 364 | struct se_device *dev = cmd->se_dev; |
| 365 | struct scatterlist *write_sg = NULL, *sg; |
| 366 | unsigned char *buf, *addr; |
| 367 | struct sg_mapping_iter m; |
| 368 | unsigned int offset = 0, len; |
| 369 | unsigned int nlbas = cmd->t_task_nolb; |
| 370 | unsigned int block_size = dev->dev_attrib.block_size; |
| 371 | unsigned int compare_len = (nlbas * block_size); |
| 372 | sense_reason_t ret = TCM_NO_SENSE; |
| 373 | int rc, i; |
| 374 | |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 375 | /* |
| 376 | * Handle early failure in transport_generic_request_failure(), |
| 377 | * which will not have taken ->caw_mutex yet.. |
| 378 | */ |
| 379 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) |
| 380 | return TCM_NO_SENSE; |
| 381 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 382 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
| 383 | if (!buf) { |
| 384 | pr_err("Unable to allocate compare_and_write buf\n"); |
Nicholas Bellinger | a289008 | 2013-08-21 18:10:04 -0700 | [diff] [blame] | 385 | ret = TCM_OUT_OF_RESOURCES; |
| 386 | goto out; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | write_sg = kzalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
| 390 | GFP_KERNEL); |
| 391 | if (!write_sg) { |
| 392 | pr_err("Unable to allocate compare_and_write sg\n"); |
| 393 | ret = TCM_OUT_OF_RESOURCES; |
| 394 | goto out; |
| 395 | } |
| 396 | /* |
| 397 | * Setup verify and write data payloads from total NumberLBAs. |
| 398 | */ |
| 399 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, |
| 400 | cmd->data_length); |
| 401 | if (!rc) { |
| 402 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); |
| 403 | ret = TCM_OUT_OF_RESOURCES; |
| 404 | goto out; |
| 405 | } |
| 406 | /* |
| 407 | * Compare against SCSI READ payload against verify payload |
| 408 | */ |
| 409 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { |
| 410 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); |
| 411 | if (!addr) { |
| 412 | ret = TCM_OUT_OF_RESOURCES; |
| 413 | goto out; |
| 414 | } |
| 415 | |
| 416 | len = min(sg->length, compare_len); |
| 417 | |
| 418 | if (memcmp(addr, buf + offset, len)) { |
| 419 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", |
| 420 | addr, buf + offset); |
| 421 | kunmap_atomic(addr); |
| 422 | goto miscompare; |
| 423 | } |
| 424 | kunmap_atomic(addr); |
| 425 | |
| 426 | offset += len; |
| 427 | compare_len -= len; |
| 428 | if (!compare_len) |
| 429 | break; |
| 430 | } |
| 431 | |
| 432 | i = 0; |
| 433 | len = cmd->t_task_nolb * block_size; |
| 434 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); |
| 435 | /* |
| 436 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. |
| 437 | */ |
| 438 | while (len) { |
| 439 | sg_miter_next(&m); |
| 440 | |
| 441 | if (block_size < PAGE_SIZE) { |
| 442 | sg_set_page(&write_sg[i], m.page, block_size, |
| 443 | block_size); |
| 444 | } else { |
| 445 | sg_miter_next(&m); |
| 446 | sg_set_page(&write_sg[i], m.page, block_size, |
| 447 | 0); |
| 448 | } |
| 449 | len -= block_size; |
| 450 | i++; |
| 451 | } |
| 452 | sg_miter_stop(&m); |
| 453 | /* |
| 454 | * Save the original SGL + nents values before updating to new |
| 455 | * assignments, to be released in transport_free_pages() -> |
| 456 | * transport_reset_sgl_orig() |
| 457 | */ |
| 458 | cmd->t_data_sg_orig = cmd->t_data_sg; |
| 459 | cmd->t_data_sg = write_sg; |
| 460 | cmd->t_data_nents_orig = cmd->t_data_nents; |
| 461 | cmd->t_data_nents = 1; |
| 462 | |
| 463 | cmd->sam_task_attr = MSG_HEAD_TAG; |
| 464 | cmd->transport_complete_callback = compare_and_write_post; |
| 465 | /* |
| 466 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler |
| 467 | * for submitting the adjusted SGL to write instance user-data. |
| 468 | */ |
| 469 | cmd->execute_cmd = sbc_execute_rw; |
| 470 | |
| 471 | spin_lock_irq(&cmd->t_state_lock); |
| 472 | cmd->t_state = TRANSPORT_PROCESSING; |
| 473 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
| 474 | spin_unlock_irq(&cmd->t_state_lock); |
| 475 | |
| 476 | __target_execute_cmd(cmd); |
| 477 | |
| 478 | kfree(buf); |
| 479 | return ret; |
| 480 | |
| 481 | miscompare: |
| 482 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", |
| 483 | dev->transport->name); |
| 484 | ret = TCM_MISCOMPARE_VERIFY; |
| 485 | out: |
| 486 | /* |
| 487 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in |
| 488 | * sbc_compare_and_write() before the original READ I/O submission. |
| 489 | */ |
| 490 | up(&dev->caw_sem); |
| 491 | kfree(write_sg); |
| 492 | kfree(buf); |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | static sense_reason_t |
| 497 | sbc_compare_and_write(struct se_cmd *cmd) |
| 498 | { |
| 499 | struct se_device *dev = cmd->se_dev; |
| 500 | sense_reason_t ret; |
| 501 | int rc; |
| 502 | /* |
| 503 | * Submit the READ first for COMPARE_AND_WRITE to perform the |
| 504 | * comparision using SGLs at cmd->t_bidi_data_sg.. |
| 505 | */ |
| 506 | rc = down_interruptible(&dev->caw_sem); |
| 507 | if ((rc != 0) || signal_pending(current)) { |
| 508 | cmd->transport_complete_callback = NULL; |
| 509 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 510 | } |
| 511 | |
| 512 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
| 513 | DMA_FROM_DEVICE); |
| 514 | if (ret) { |
| 515 | cmd->transport_complete_callback = NULL; |
| 516 | up(&dev->caw_sem); |
| 517 | return ret; |
| 518 | } |
| 519 | /* |
| 520 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() |
| 521 | * upon MISCOMPARE, or in compare_and_write_done() upon completion |
| 522 | * of WRITE instance user-data. |
| 523 | */ |
| 524 | return TCM_NO_SENSE; |
| 525 | } |
| 526 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 527 | sense_reason_t |
| 528 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 529 | { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 530 | struct se_device *dev = cmd->se_dev; |
| 531 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 532 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 533 | u32 sectors = 0; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 534 | sense_reason_t ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 535 | |
| 536 | switch (cdb[0]) { |
| 537 | case READ_6: |
| 538 | sectors = transport_get_sectors_6(cdb); |
| 539 | cmd->t_task_lba = transport_lba_21(cdb); |
| 540 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 541 | cmd->execute_rw = ops->execute_rw; |
| 542 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 543 | break; |
| 544 | case READ_10: |
| 545 | sectors = transport_get_sectors_10(cdb); |
| 546 | cmd->t_task_lba = transport_lba_32(cdb); |
| 547 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 548 | cmd->execute_rw = ops->execute_rw; |
| 549 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 550 | break; |
| 551 | case READ_12: |
| 552 | sectors = transport_get_sectors_12(cdb); |
| 553 | cmd->t_task_lba = transport_lba_32(cdb); |
| 554 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 555 | cmd->execute_rw = ops->execute_rw; |
| 556 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 557 | break; |
| 558 | case READ_16: |
| 559 | sectors = transport_get_sectors_16(cdb); |
| 560 | cmd->t_task_lba = transport_lba_64(cdb); |
| 561 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 562 | cmd->execute_rw = ops->execute_rw; |
| 563 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 564 | break; |
| 565 | case WRITE_6: |
| 566 | sectors = transport_get_sectors_6(cdb); |
| 567 | cmd->t_task_lba = transport_lba_21(cdb); |
| 568 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 569 | cmd->execute_rw = ops->execute_rw; |
| 570 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 571 | break; |
| 572 | case WRITE_10: |
| 573 | case WRITE_VERIFY: |
| 574 | sectors = transport_get_sectors_10(cdb); |
| 575 | cmd->t_task_lba = transport_lba_32(cdb); |
| 576 | if (cdb[1] & 0x8) |
| 577 | cmd->se_cmd_flags |= SCF_FUA; |
| 578 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 579 | cmd->execute_rw = ops->execute_rw; |
| 580 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 581 | break; |
| 582 | case WRITE_12: |
| 583 | sectors = transport_get_sectors_12(cdb); |
| 584 | cmd->t_task_lba = transport_lba_32(cdb); |
| 585 | if (cdb[1] & 0x8) |
| 586 | cmd->se_cmd_flags |= SCF_FUA; |
| 587 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 588 | cmd->execute_rw = ops->execute_rw; |
| 589 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 590 | break; |
| 591 | case WRITE_16: |
| 592 | sectors = transport_get_sectors_16(cdb); |
| 593 | cmd->t_task_lba = transport_lba_64(cdb); |
| 594 | if (cdb[1] & 0x8) |
| 595 | cmd->se_cmd_flags |= SCF_FUA; |
| 596 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 597 | cmd->execute_rw = ops->execute_rw; |
| 598 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 599 | break; |
| 600 | case XDWRITEREAD_10: |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 601 | if (cmd->data_direction != DMA_TO_DEVICE || |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 602 | !(cmd->se_cmd_flags & SCF_BIDI)) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 603 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 604 | sectors = transport_get_sectors_10(cdb); |
| 605 | |
| 606 | cmd->t_task_lba = transport_lba_32(cdb); |
| 607 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 608 | |
| 609 | /* |
| 610 | * Setup BIDI XOR callback to be run after I/O completion. |
| 611 | */ |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 612 | cmd->execute_rw = ops->execute_rw; |
| 613 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 614 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 615 | if (cdb[1] & 0x8) |
| 616 | cmd->se_cmd_flags |= SCF_FUA; |
| 617 | break; |
| 618 | case VARIABLE_LENGTH_CMD: |
| 619 | { |
| 620 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 621 | switch (service_action) { |
| 622 | case XDWRITEREAD_32: |
| 623 | sectors = transport_get_sectors_32(cdb); |
| 624 | |
| 625 | /* |
| 626 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 627 | * XDWRITE_READ_32 logic. |
| 628 | */ |
| 629 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
| 630 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 631 | |
| 632 | /* |
| 633 | * Setup BIDI XOR callback to be run during after I/O |
| 634 | * completion. |
| 635 | */ |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 636 | cmd->execute_rw = ops->execute_rw; |
| 637 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 638 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 639 | if (cdb[1] & 0x8) |
| 640 | cmd->se_cmd_flags |= SCF_FUA; |
| 641 | break; |
| 642 | case WRITE_SAME_32: |
| 643 | sectors = transport_get_sectors_32(cdb); |
| 644 | if (!sectors) { |
| 645 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 646 | " supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 647 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 648 | } |
| 649 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 650 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 651 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 652 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 653 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 654 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 655 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 656 | break; |
| 657 | default: |
| 658 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 659 | " 0x%04x not supported\n", service_action); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 660 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 661 | } |
| 662 | break; |
| 663 | } |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 664 | case COMPARE_AND_WRITE: |
| 665 | sectors = cdb[13]; |
| 666 | /* |
| 667 | * Currently enforce COMPARE_AND_WRITE for a single sector |
| 668 | */ |
| 669 | if (sectors > 1) { |
| 670 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" |
| 671 | " than 1\n", sectors); |
| 672 | return TCM_INVALID_CDB_FIELD; |
| 673 | } |
| 674 | /* |
| 675 | * Double size because we have two buffers, note that |
| 676 | * zero is not an error.. |
| 677 | */ |
| 678 | size = 2 * sbc_get_size(cmd, sectors); |
| 679 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 680 | cmd->t_task_nolb = sectors; |
| 681 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; |
| 682 | cmd->execute_rw = ops->execute_rw; |
| 683 | cmd->execute_cmd = sbc_compare_and_write; |
| 684 | cmd->transport_complete_callback = compare_and_write_callback; |
| 685 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 686 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 687 | size = READ_CAP_LEN; |
| 688 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 689 | break; |
| 690 | case SERVICE_ACTION_IN: |
| 691 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 692 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 693 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 694 | break; |
| 695 | default: |
| 696 | pr_err("Unsupported SA: 0x%02x\n", |
| 697 | cmd->t_task_cdb[1] & 0x1f); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 698 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 699 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 700 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 701 | (cdb[12] << 8) | cdb[13]; |
| 702 | break; |
| 703 | case SYNCHRONIZE_CACHE: |
| 704 | case SYNCHRONIZE_CACHE_16: |
Hannes Reinecke | 882e3f8 | 2013-03-04 14:08:06 +0100 | [diff] [blame] | 705 | if (!ops->execute_sync_cache) { |
| 706 | size = 0; |
| 707 | cmd->execute_cmd = sbc_emulate_noop; |
| 708 | break; |
| 709 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 710 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 711 | /* |
| 712 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE |
| 713 | */ |
| 714 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 715 | sectors = transport_get_sectors_10(cdb); |
| 716 | cmd->t_task_lba = transport_lba_32(cdb); |
| 717 | } else { |
| 718 | sectors = transport_get_sectors_16(cdb); |
| 719 | cmd->t_task_lba = transport_lba_64(cdb); |
| 720 | } |
| 721 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 722 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 723 | |
| 724 | /* |
| 725 | * Check to ensure that LBA + Range does not exceed past end of |
| 726 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
| 727 | */ |
| 728 | if (cmd->t_task_lba || sectors) { |
| 729 | if (sbc_check_valid_sectors(cmd) < 0) |
Roland Dreier | 3363367 | 2013-02-08 15:18:38 -0800 | [diff] [blame] | 730 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 731 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 732 | cmd->execute_cmd = ops->execute_sync_cache; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 733 | break; |
| 734 | case UNMAP: |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 735 | if (!ops->execute_unmap) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 736 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 737 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 738 | size = get_unaligned_be16(&cdb[7]); |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 739 | cmd->execute_cmd = ops->execute_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 740 | break; |
| 741 | case WRITE_SAME_16: |
| 742 | sectors = transport_get_sectors_16(cdb); |
| 743 | if (!sectors) { |
| 744 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 745 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 746 | } |
| 747 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 748 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 749 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 750 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 751 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 752 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 753 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 754 | break; |
| 755 | case WRITE_SAME: |
| 756 | sectors = transport_get_sectors_10(cdb); |
| 757 | if (!sectors) { |
| 758 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 759 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 760 | } |
| 761 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 762 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 763 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
| 764 | |
| 765 | /* |
| 766 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence |
| 767 | * of byte 1 bit 3 UNMAP instead of original reserved field |
| 768 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 769 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 770 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 771 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 772 | break; |
| 773 | case VERIFY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 774 | size = 0; |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 775 | cmd->execute_cmd = sbc_emulate_noop; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 776 | break; |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 777 | case REZERO_UNIT: |
| 778 | case SEEK_6: |
| 779 | case SEEK_10: |
| 780 | /* |
| 781 | * There are still clients out there which use these old SCSI-2 |
| 782 | * commands. This mainly happens when running VMs with legacy |
| 783 | * guest systems, connected via SCSI command pass-through to |
| 784 | * iSCSI targets. Make them happy and return status GOOD. |
| 785 | */ |
| 786 | size = 0; |
| 787 | cmd->execute_cmd = sbc_emulate_noop; |
| 788 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 789 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 790 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 791 | if (ret) |
| 792 | return ret; |
| 793 | } |
| 794 | |
| 795 | /* reject any command that we don't have a handler for */ |
| 796 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 797 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 798 | |
| 799 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 800 | unsigned long long end_lba; |
| 801 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 802 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 803 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 804 | " big sectors %u exceeds fabric_max_sectors:" |
| 805 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 806 | dev->dev_attrib.fabric_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 807 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 808 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 809 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 810 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 811 | " big sectors %u exceeds backend hw_max_sectors:" |
| 812 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 813 | dev->dev_attrib.hw_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 814 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 815 | } |
| 816 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 817 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 818 | if (cmd->t_task_lba + sectors > end_lba) { |
| 819 | pr_err("cmd exceeds last lba %llu " |
| 820 | "(lba %llu, sectors %u)\n", |
| 821 | end_lba, cmd->t_task_lba, sectors); |
Roland Dreier | 09ceadc | 2013-06-26 17:36:18 -0700 | [diff] [blame] | 822 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 823 | } |
| 824 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 825 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
| 826 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 827 | } |
| 828 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 829 | return target_cmd_size_check(cmd, size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 830 | } |
| 831 | EXPORT_SYMBOL(sbc_parse_cdb); |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 832 | |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 833 | u32 sbc_get_device_type(struct se_device *dev) |
| 834 | { |
| 835 | return TYPE_DISK; |
| 836 | } |
| 837 | EXPORT_SYMBOL(sbc_get_device_type); |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 838 | |
| 839 | sense_reason_t |
| 840 | sbc_execute_unmap(struct se_cmd *cmd, |
| 841 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, |
| 842 | sector_t, sector_t), |
| 843 | void *priv) |
| 844 | { |
| 845 | struct se_device *dev = cmd->se_dev; |
| 846 | unsigned char *buf, *ptr = NULL; |
| 847 | sector_t lba; |
| 848 | int size; |
| 849 | u32 range; |
| 850 | sense_reason_t ret = 0; |
| 851 | int dl, bd_dl; |
| 852 | |
| 853 | /* We never set ANC_SUP */ |
| 854 | if (cmd->t_task_cdb[1]) |
| 855 | return TCM_INVALID_CDB_FIELD; |
| 856 | |
| 857 | if (cmd->data_length == 0) { |
| 858 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 859 | return 0; |
| 860 | } |
| 861 | |
| 862 | if (cmd->data_length < 8) { |
| 863 | pr_warn("UNMAP parameter list length %u too small\n", |
| 864 | cmd->data_length); |
| 865 | return TCM_PARAMETER_LIST_LENGTH_ERROR; |
| 866 | } |
| 867 | |
| 868 | buf = transport_kmap_data_sg(cmd); |
| 869 | if (!buf) |
| 870 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 871 | |
| 872 | dl = get_unaligned_be16(&buf[0]); |
| 873 | bd_dl = get_unaligned_be16(&buf[2]); |
| 874 | |
| 875 | size = cmd->data_length - 8; |
| 876 | if (bd_dl > size) |
| 877 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", |
| 878 | cmd->data_length, bd_dl); |
| 879 | else |
| 880 | size = bd_dl; |
| 881 | |
| 882 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
| 883 | ret = TCM_INVALID_PARAMETER_LIST; |
| 884 | goto err; |
| 885 | } |
| 886 | |
| 887 | /* First UNMAP block descriptor starts at 8 byte offset */ |
| 888 | ptr = &buf[8]; |
| 889 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" |
| 890 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
| 891 | |
| 892 | while (size >= 16) { |
| 893 | lba = get_unaligned_be64(&ptr[0]); |
| 894 | range = get_unaligned_be32(&ptr[8]); |
| 895 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", |
| 896 | (unsigned long long)lba, range); |
| 897 | |
| 898 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
| 899 | ret = TCM_INVALID_PARAMETER_LIST; |
| 900 | goto err; |
| 901 | } |
| 902 | |
| 903 | if (lba + range > dev->transport->get_blocks(dev) + 1) { |
| 904 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
| 905 | goto err; |
| 906 | } |
| 907 | |
| 908 | ret = do_unmap_fn(cmd, priv, lba, range); |
| 909 | if (ret) |
| 910 | goto err; |
| 911 | |
| 912 | ptr += 16; |
| 913 | size -= 16; |
| 914 | } |
| 915 | |
| 916 | err: |
| 917 | transport_kunmap_data_sg(cmd); |
| 918 | if (!ret) |
| 919 | target_complete_cmd(cmd, GOOD); |
| 920 | return ret; |
| 921 | } |
| 922 | EXPORT_SYMBOL(sbc_execute_unmap); |