Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Changes: |
| 3 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000 |
| 4 | * - get rid of some verify_areas and use __copy*user and __get/put_user |
| 5 | * for the ones that remain |
| 6 | */ |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/blkdev.h> |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/mm.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <asm/uaccess.h> |
| 16 | |
| 17 | #include <scsi/scsi.h> |
| 18 | #include <scsi/scsi_device.h> |
| 19 | #include <scsi/scsi_eh.h> |
| 20 | #include <scsi/scsi_host.h> |
| 21 | #include <scsi/scsi_ioctl.h> |
| 22 | #include <scsi/scsi_request.h> |
| 23 | #include <scsi/sg.h> |
| 24 | #include <scsi/scsi_dbg.h> |
| 25 | |
| 26 | #include "scsi_logging.h" |
| 27 | |
| 28 | #define NORMAL_RETRIES 5 |
| 29 | #define IOCTL_NORMAL_TIMEOUT (10 * HZ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | #define MAX_BUF PAGE_SIZE |
| 32 | |
Christoph Hellwig | 3299352 | 2005-09-06 14:03:44 +0200 | [diff] [blame^] | 33 | /** |
| 34 | * ioctl_probe -- return host identification |
| 35 | * @host: host to identify |
| 36 | * @buffer: userspace buffer for identification |
| 37 | * |
| 38 | * Return an identifying string at @buffer, if @buffer is non-NULL, filling |
| 39 | * to the length stored at * (int *) @buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | static int ioctl_probe(struct Scsi_Host *host, void __user *buffer) |
| 42 | { |
| 43 | unsigned int len, slen; |
| 44 | const char *string; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Christoph Hellwig | 3299352 | 2005-09-06 14:03:44 +0200 | [diff] [blame^] | 46 | if (buffer) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | if (get_user(len, (unsigned int __user *) buffer)) |
| 48 | return -EFAULT; |
| 49 | |
| 50 | if (host->hostt->info) |
| 51 | string = host->hostt->info(host); |
| 52 | else |
| 53 | string = host->hostt->name; |
| 54 | if (string) { |
| 55 | slen = strlen(string); |
| 56 | if (len > slen) |
| 57 | len = slen + 1; |
| 58 | if (copy_to_user(buffer, string, len)) |
| 59 | return -EFAULT; |
| 60 | } |
| 61 | } |
Christoph Hellwig | 3299352 | 2005-09-06 14:03:44 +0200 | [diff] [blame^] | 62 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | /* |
| 66 | |
| 67 | * The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host. |
| 68 | * The IOCTL_NORMAL_TIMEOUT and NORMAL_RETRIES variables are used. |
| 69 | * |
| 70 | * dev is the SCSI device struct ptr, *(int *) arg is the length of the |
| 71 | * input data, if any, not including the command string & counts, |
| 72 | * *((int *)arg + 1) is the output buffer size in bytes. |
| 73 | * |
| 74 | * *(char *) ((int *) arg)[2] the actual command byte. |
| 75 | * |
| 76 | * Note that if more than MAX_BUF bytes are requested to be transferred, |
| 77 | * the ioctl will fail with error EINVAL. |
| 78 | * |
| 79 | * This size *does not* include the initial lengths that were passed. |
| 80 | * |
| 81 | * The SCSI command is read from the memory location immediately after the |
| 82 | * length words, and the input data is right after the command. The SCSI |
| 83 | * routines know the command size based on the opcode decode. |
| 84 | * |
| 85 | * The output area is then filled in starting from the command byte. |
| 86 | */ |
| 87 | |
| 88 | static int ioctl_internal_command(struct scsi_device *sdev, char *cmd, |
| 89 | int timeout, int retries) |
| 90 | { |
| 91 | struct scsi_request *sreq; |
| 92 | int result; |
| 93 | struct scsi_sense_hdr sshdr; |
| 94 | |
| 95 | SCSI_LOG_IOCTL(1, printk("Trying ioctl with scsi command %d\n", *cmd)); |
| 96 | |
| 97 | sreq = scsi_allocate_request(sdev, GFP_KERNEL); |
| 98 | if (!sreq) { |
| 99 | printk(KERN_WARNING "SCSI internal ioctl failed, no memory\n"); |
| 100 | return -ENOMEM; |
| 101 | } |
| 102 | |
| 103 | sreq->sr_data_direction = DMA_NONE; |
| 104 | scsi_wait_req(sreq, cmd, NULL, 0, timeout, retries); |
| 105 | |
| 106 | SCSI_LOG_IOCTL(2, printk("Ioctl returned 0x%x\n", sreq->sr_result)); |
| 107 | |
| 108 | if ((driver_byte(sreq->sr_result) & DRIVER_SENSE) && |
| 109 | (scsi_request_normalize_sense(sreq, &sshdr))) { |
| 110 | switch (sshdr.sense_key) { |
| 111 | case ILLEGAL_REQUEST: |
| 112 | if (cmd[0] == ALLOW_MEDIUM_REMOVAL) |
| 113 | sdev->lockable = 0; |
| 114 | else |
| 115 | printk(KERN_INFO "ioctl_internal_command: " |
| 116 | "ILLEGAL REQUEST asc=0x%x ascq=0x%x\n", |
| 117 | sshdr.asc, sshdr.ascq); |
| 118 | break; |
| 119 | case NOT_READY: /* This happens if there is no disc in drive */ |
| 120 | if (sdev->removable && (cmd[0] != TEST_UNIT_READY)) { |
| 121 | printk(KERN_INFO "Device not ready. Make sure" |
| 122 | " there is a disc in the drive.\n"); |
| 123 | break; |
| 124 | } |
| 125 | case UNIT_ATTENTION: |
| 126 | if (sdev->removable) { |
| 127 | sdev->changed = 1; |
| 128 | sreq->sr_result = 0; /* This is no longer considered an error */ |
| 129 | break; |
| 130 | } |
| 131 | default: /* Fall through for non-removable media */ |
| 132 | printk(KERN_INFO "ioctl_internal_command: <%d %d %d " |
| 133 | "%d> return code = %x\n", |
| 134 | sdev->host->host_no, |
| 135 | sdev->channel, |
| 136 | sdev->id, |
| 137 | sdev->lun, |
| 138 | sreq->sr_result); |
| 139 | scsi_print_req_sense(" ", sreq); |
| 140 | break; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | result = sreq->sr_result; |
| 145 | SCSI_LOG_IOCTL(2, printk("IOCTL Releasing command\n")); |
| 146 | scsi_release_request(sreq); |
| 147 | return result; |
| 148 | } |
| 149 | |
| 150 | int scsi_set_medium_removal(struct scsi_device *sdev, char state) |
| 151 | { |
| 152 | char scsi_cmd[MAX_COMMAND_SIZE]; |
| 153 | int ret; |
| 154 | |
| 155 | if (!sdev->removable || !sdev->lockable) |
| 156 | return 0; |
| 157 | |
| 158 | scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL; |
| 159 | scsi_cmd[1] = 0; |
| 160 | scsi_cmd[2] = 0; |
| 161 | scsi_cmd[3] = 0; |
| 162 | scsi_cmd[4] = state; |
| 163 | scsi_cmd[5] = 0; |
| 164 | |
| 165 | ret = ioctl_internal_command(sdev, scsi_cmd, |
| 166 | IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES); |
| 167 | if (ret == 0) |
| 168 | sdev->locked = (state == SCSI_REMOVAL_PREVENT); |
| 169 | return ret; |
| 170 | } |
| 171 | EXPORT_SYMBOL(scsi_set_medium_removal); |
| 172 | |
| 173 | /* |
| 174 | * This interface is deprecated - users should use the scsi generic (sg) |
| 175 | * interface instead, as this is a more flexible approach to performing |
| 176 | * generic SCSI commands on a device. |
| 177 | * |
| 178 | * The structure that we are passed should look like: |
| 179 | * |
| 180 | * struct sdata { |
| 181 | * unsigned int inlen; [i] Length of data to be written to device |
| 182 | * unsigned int outlen; [i] Length of data to be read from device |
| 183 | * unsigned char cmd[x]; [i] SCSI command (6 <= x <= 12). |
| 184 | * [o] Data read from device starts here. |
| 185 | * [o] On error, sense buffer starts here. |
| 186 | * unsigned char wdata[y]; [i] Data written to device starts here. |
| 187 | * }; |
| 188 | * Notes: |
| 189 | * - The SCSI command length is determined by examining the 1st byte |
| 190 | * of the given command. There is no way to override this. |
| 191 | * - Data transfers are limited to PAGE_SIZE (4K on i386, 8K on alpha). |
| 192 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to |
| 193 | * accommodate the sense buffer when an error occurs. |
| 194 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that |
| 195 | * old code will not be surprised. |
| 196 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive |
| 197 | * a negative return and the Unix error code in 'errno'. |
| 198 | * If the SCSI command succeeds then 0 is returned. |
| 199 | * Positive numbers returned are the compacted SCSI error codes (4 |
| 200 | * bytes in one int) where the lowest byte is the SCSI status. |
| 201 | * See the drivers/scsi/scsi.h file for more information on this. |
| 202 | * |
| 203 | */ |
| 204 | #define OMAX_SB_LEN 16 /* Old sense buffer length */ |
| 205 | |
| 206 | int scsi_ioctl_send_command(struct scsi_device *sdev, |
| 207 | struct scsi_ioctl_command __user *sic) |
| 208 | { |
| 209 | char *buf; |
| 210 | unsigned char cmd[MAX_COMMAND_SIZE]; |
| 211 | char __user *cmd_in; |
| 212 | struct scsi_request *sreq; |
| 213 | unsigned char opcode; |
| 214 | unsigned int inlen, outlen, cmdlen; |
| 215 | unsigned int needed, buf_needed; |
| 216 | int timeout, retries, result; |
| 217 | int data_direction, gfp_mask = GFP_KERNEL; |
| 218 | |
| 219 | if (!sic) |
| 220 | return -EINVAL; |
| 221 | |
| 222 | if (sdev->host->unchecked_isa_dma) |
| 223 | gfp_mask |= GFP_DMA; |
| 224 | |
| 225 | /* |
| 226 | * Verify that we can read at least this much. |
| 227 | */ |
| 228 | if (!access_ok(VERIFY_READ, sic, sizeof(Scsi_Ioctl_Command))) |
| 229 | return -EFAULT; |
| 230 | |
| 231 | if(__get_user(inlen, &sic->inlen)) |
| 232 | return -EFAULT; |
| 233 | |
| 234 | if(__get_user(outlen, &sic->outlen)) |
| 235 | return -EFAULT; |
| 236 | |
| 237 | /* |
| 238 | * We do not transfer more than MAX_BUF with this interface. |
| 239 | * If the user needs to transfer more data than this, they |
| 240 | * should use scsi_generics (sg) instead. |
| 241 | */ |
| 242 | if (inlen > MAX_BUF) |
| 243 | return -EINVAL; |
| 244 | if (outlen > MAX_BUF) |
| 245 | return -EINVAL; |
| 246 | |
| 247 | cmd_in = sic->data; |
| 248 | if(get_user(opcode, cmd_in)) |
| 249 | return -EFAULT; |
| 250 | |
| 251 | needed = buf_needed = (inlen > outlen ? inlen : outlen); |
| 252 | if (buf_needed) { |
| 253 | buf_needed = (buf_needed + 511) & ~511; |
| 254 | if (buf_needed > MAX_BUF) |
| 255 | buf_needed = MAX_BUF; |
| 256 | buf = kmalloc(buf_needed, gfp_mask); |
| 257 | if (!buf) |
| 258 | return -ENOMEM; |
| 259 | memset(buf, 0, buf_needed); |
| 260 | if (inlen == 0) { |
| 261 | data_direction = DMA_FROM_DEVICE; |
| 262 | } else if (outlen == 0 ) { |
| 263 | data_direction = DMA_TO_DEVICE; |
| 264 | } else { |
| 265 | /* |
| 266 | * Can this ever happen? |
| 267 | */ |
| 268 | data_direction = DMA_BIDIRECTIONAL; |
| 269 | } |
| 270 | |
| 271 | } else { |
| 272 | buf = NULL; |
| 273 | data_direction = DMA_NONE; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Obtain the command from the user's address space. |
| 278 | */ |
| 279 | cmdlen = COMMAND_SIZE(opcode); |
| 280 | |
| 281 | result = -EFAULT; |
| 282 | |
| 283 | if (!access_ok(VERIFY_READ, cmd_in, cmdlen + inlen)) |
| 284 | goto error; |
| 285 | |
| 286 | if(__copy_from_user(cmd, cmd_in, cmdlen)) |
| 287 | goto error; |
| 288 | |
| 289 | /* |
| 290 | * Obtain the data to be sent to the device (if any). |
| 291 | */ |
| 292 | |
| 293 | if(copy_from_user(buf, cmd_in + cmdlen, inlen)) |
| 294 | goto error; |
| 295 | |
| 296 | switch (opcode) { |
| 297 | case SEND_DIAGNOSTIC: |
| 298 | case FORMAT_UNIT: |
| 299 | timeout = FORMAT_UNIT_TIMEOUT; |
| 300 | retries = 1; |
| 301 | break; |
| 302 | case START_STOP: |
| 303 | timeout = START_STOP_TIMEOUT; |
| 304 | retries = NORMAL_RETRIES; |
| 305 | break; |
| 306 | case MOVE_MEDIUM: |
| 307 | timeout = MOVE_MEDIUM_TIMEOUT; |
| 308 | retries = NORMAL_RETRIES; |
| 309 | break; |
| 310 | case READ_ELEMENT_STATUS: |
| 311 | timeout = READ_ELEMENT_STATUS_TIMEOUT; |
| 312 | retries = NORMAL_RETRIES; |
| 313 | break; |
| 314 | case READ_DEFECT_DATA: |
| 315 | timeout = READ_DEFECT_DATA_TIMEOUT; |
| 316 | retries = 1; |
| 317 | break; |
| 318 | default: |
| 319 | timeout = IOCTL_NORMAL_TIMEOUT; |
| 320 | retries = NORMAL_RETRIES; |
| 321 | break; |
| 322 | } |
| 323 | |
| 324 | sreq = scsi_allocate_request(sdev, GFP_KERNEL); |
| 325 | if (!sreq) { |
| 326 | result = -EINTR; |
| 327 | goto error; |
| 328 | } |
| 329 | |
| 330 | sreq->sr_data_direction = data_direction; |
| 331 | scsi_wait_req(sreq, cmd, buf, needed, timeout, retries); |
| 332 | |
| 333 | /* |
| 334 | * If there was an error condition, pass the info back to the user. |
| 335 | */ |
| 336 | result = sreq->sr_result; |
| 337 | if (result) { |
| 338 | int sb_len = sizeof(sreq->sr_sense_buffer); |
| 339 | |
| 340 | sb_len = (sb_len > OMAX_SB_LEN) ? OMAX_SB_LEN : sb_len; |
| 341 | if (copy_to_user(cmd_in, sreq->sr_sense_buffer, sb_len)) |
| 342 | result = -EFAULT; |
| 343 | } else { |
| 344 | if (copy_to_user(cmd_in, buf, outlen)) |
| 345 | result = -EFAULT; |
| 346 | } |
| 347 | |
| 348 | scsi_release_request(sreq); |
| 349 | error: |
| 350 | kfree(buf); |
| 351 | return result; |
| 352 | } |
| 353 | EXPORT_SYMBOL(scsi_ioctl_send_command); |
| 354 | |
| 355 | /* |
| 356 | * The scsi_ioctl_get_pci() function places into arg the value |
| 357 | * pci_dev::slot_name (8 characters) for the PCI device (if any). |
| 358 | * Returns: 0 on success |
| 359 | * -ENXIO if there isn't a PCI device pointer |
| 360 | * (could be because the SCSI driver hasn't been |
| 361 | * updated yet, or because it isn't a SCSI |
| 362 | * device) |
| 363 | * any copy_to_user() error on failure there |
| 364 | */ |
| 365 | static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg) |
| 366 | { |
| 367 | struct device *dev = scsi_get_device(sdev->host); |
| 368 | |
| 369 | if (!dev) |
| 370 | return -ENXIO; |
| 371 | return copy_to_user(arg, dev->bus_id, sizeof(dev->bus_id))? -EFAULT: 0; |
| 372 | } |
| 373 | |
| 374 | |
| 375 | /* |
| 376 | * the scsi_ioctl() function differs from most ioctls in that it does |
| 377 | * not take a major/minor number as the dev field. Rather, it takes |
| 378 | * a pointer to a scsi_devices[] element, a structure. |
| 379 | */ |
| 380 | int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) |
| 381 | { |
| 382 | char scsi_cmd[MAX_COMMAND_SIZE]; |
| 383 | |
| 384 | /* No idea how this happens.... */ |
| 385 | if (!sdev) |
| 386 | return -ENXIO; |
| 387 | |
| 388 | /* |
| 389 | * If we are in the middle of error recovery, don't let anyone |
| 390 | * else try and use this device. Also, if error recovery fails, it |
| 391 | * may try and take the device offline, in which case all further |
| 392 | * access to the device is prohibited. |
| 393 | */ |
| 394 | if (!scsi_block_when_processing_errors(sdev)) |
| 395 | return -ENODEV; |
| 396 | |
| 397 | /* Check for deprecated ioctls ... all the ioctls which don't |
| 398 | * follow the new unique numbering scheme are deprecated */ |
| 399 | switch (cmd) { |
| 400 | case SCSI_IOCTL_SEND_COMMAND: |
| 401 | case SCSI_IOCTL_TEST_UNIT_READY: |
| 402 | case SCSI_IOCTL_BENCHMARK_COMMAND: |
| 403 | case SCSI_IOCTL_SYNC: |
| 404 | case SCSI_IOCTL_START_UNIT: |
| 405 | case SCSI_IOCTL_STOP_UNIT: |
| 406 | printk(KERN_WARNING "program %s is using a deprecated SCSI " |
| 407 | "ioctl, please convert it to SG_IO\n", current->comm); |
| 408 | break; |
| 409 | default: |
| 410 | break; |
| 411 | } |
| 412 | |
| 413 | switch (cmd) { |
| 414 | case SCSI_IOCTL_GET_IDLUN: |
| 415 | if (!access_ok(VERIFY_WRITE, arg, sizeof(struct scsi_idlun))) |
| 416 | return -EFAULT; |
| 417 | |
| 418 | __put_user((sdev->id & 0xff) |
| 419 | + ((sdev->lun & 0xff) << 8) |
| 420 | + ((sdev->channel & 0xff) << 16) |
| 421 | + ((sdev->host->host_no & 0xff) << 24), |
| 422 | &((struct scsi_idlun __user *)arg)->dev_id); |
| 423 | __put_user(sdev->host->unique_id, |
| 424 | &((struct scsi_idlun __user *)arg)->host_unique_id); |
| 425 | return 0; |
| 426 | case SCSI_IOCTL_GET_BUS_NUMBER: |
| 427 | return put_user(sdev->host->host_no, (int __user *)arg); |
| 428 | case SCSI_IOCTL_PROBE_HOST: |
| 429 | return ioctl_probe(sdev->host, arg); |
| 430 | case SCSI_IOCTL_SEND_COMMAND: |
| 431 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 432 | return -EACCES; |
| 433 | return scsi_ioctl_send_command(sdev, arg); |
| 434 | case SCSI_IOCTL_DOORLOCK: |
| 435 | return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); |
| 436 | case SCSI_IOCTL_DOORUNLOCK: |
| 437 | return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); |
| 438 | case SCSI_IOCTL_TEST_UNIT_READY: |
| 439 | return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT, |
| 440 | NORMAL_RETRIES); |
| 441 | case SCSI_IOCTL_START_UNIT: |
| 442 | scsi_cmd[0] = START_STOP; |
| 443 | scsi_cmd[1] = 0; |
| 444 | scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; |
| 445 | scsi_cmd[4] = 1; |
| 446 | return ioctl_internal_command(sdev, scsi_cmd, |
| 447 | START_STOP_TIMEOUT, NORMAL_RETRIES); |
| 448 | case SCSI_IOCTL_STOP_UNIT: |
| 449 | scsi_cmd[0] = START_STOP; |
| 450 | scsi_cmd[1] = 0; |
| 451 | scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; |
| 452 | scsi_cmd[4] = 0; |
| 453 | return ioctl_internal_command(sdev, scsi_cmd, |
| 454 | START_STOP_TIMEOUT, NORMAL_RETRIES); |
| 455 | case SCSI_IOCTL_GET_PCI: |
| 456 | return scsi_ioctl_get_pci(sdev, arg); |
| 457 | default: |
| 458 | if (sdev->host->hostt->ioctl) |
| 459 | return sdev->host->hostt->ioctl(sdev, cmd, arg); |
| 460 | } |
| 461 | return -EINVAL; |
| 462 | } |
| 463 | EXPORT_SYMBOL(scsi_ioctl); |
| 464 | |
| 465 | /* |
| 466 | * the scsi_nonblock_ioctl() function is designed for ioctls which may |
| 467 | * be executed even if the device is in recovery. |
| 468 | */ |
| 469 | int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd, |
| 470 | void __user *arg, struct file *filp) |
| 471 | { |
| 472 | int val, result; |
| 473 | |
| 474 | /* The first set of iocts may be executed even if we're doing |
| 475 | * error processing, as long as the device was opened |
| 476 | * non-blocking */ |
| 477 | if (filp && filp->f_flags & O_NONBLOCK) { |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 478 | if (sdev->host->shost_state == SHOST_RECOVERY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | return -ENODEV; |
| 480 | } else if (!scsi_block_when_processing_errors(sdev)) |
| 481 | return -ENODEV; |
| 482 | |
| 483 | switch (cmd) { |
| 484 | case SG_SCSI_RESET: |
| 485 | result = get_user(val, (int __user *)arg); |
| 486 | if (result) |
| 487 | return result; |
| 488 | if (val == SG_SCSI_RESET_NOTHING) |
| 489 | return 0; |
| 490 | switch (val) { |
| 491 | case SG_SCSI_RESET_DEVICE: |
| 492 | val = SCSI_TRY_RESET_DEVICE; |
| 493 | break; |
| 494 | case SG_SCSI_RESET_BUS: |
| 495 | val = SCSI_TRY_RESET_BUS; |
| 496 | break; |
| 497 | case SG_SCSI_RESET_HOST: |
| 498 | val = SCSI_TRY_RESET_HOST; |
| 499 | break; |
| 500 | default: |
| 501 | return -EINVAL; |
| 502 | } |
| 503 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 504 | return -EACCES; |
| 505 | return (scsi_reset_provider(sdev, val) == |
| 506 | SUCCESS) ? 0 : -EIO; |
| 507 | } |
| 508 | return -ENODEV; |
| 509 | } |
| 510 | EXPORT_SYMBOL(scsi_nonblockable_ioctl); |