block/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/capability.h>
   3 #include <linux/compat.h>
   4 #include <linux/blkdev.h>
   5 #include <linux/export.h>
   6 #include <linux/gfp.h>
   7 #include <linux/blkpg.h>
   8 #include <linux/hdreg.h>
   9 #include <linux/backing-dev.h>
  10 #include <linux/fs.h>
  11 #include <linux/blktrace_api.h>
  12 #include <linux/pr.h>
  13 #include <linux/uaccess.h>
  14 #include "blk.h"
  15
  16 static int blkpg_do_ioctl(struct block_device *bdev,
  17                           struct blkpg_partition __user *upart, int op)
  18 {
  19         struct blkpg_partition p;
  20         long long start, length;
  21
  22         if (!capable(CAP_SYS_ADMIN))
  23                 return -EACCES;
  24         if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
  25                 return -EFAULT;
  26         if (bdev_is_partition(bdev))
  27                 return -EINVAL;
  28
  29         if (p.pno <= 0)
  30                 return -EINVAL;
  31
  32         if (op == BLKPG_DEL_PARTITION)
  33                 return bdev_del_partition(bdev, p.pno);
  34
  35         start = p.start >> SECTOR_SHIFT;
  36         length = p.length >> SECTOR_SHIFT;
  37
  38         switch (op) {
  39         case BLKPG_ADD_PARTITION:
  40                 /* check if partition is aligned to blocksize */
  41                 if (p.start & (bdev_logical_block_size(bdev) - 1))
  42                         return -EINVAL;
  43                 return bdev_add_partition(bdev, p.pno, start, length);
  44         case BLKPG_RESIZE_PARTITION:
  45                 return bdev_resize_partition(bdev, p.pno, start, length);
  46         default:
  47                 return -EINVAL;
  48         }
  49 }
  50
  51 static int blkpg_ioctl(struct block_device *bdev,
  52                        struct blkpg_ioctl_arg __user *arg)
  53 {
  54         struct blkpg_partition __user *udata;
  55         int op;
  56
  57         if (get_user(op, &arg->op) || get_user(udata, &arg->data))
  58                 return -EFAULT;
  59
  60         return blkpg_do_ioctl(bdev, udata, op);
  61 }
  62
  63 #ifdef CONFIG_COMPAT
  64 struct compat_blkpg_ioctl_arg {
  65         compat_int_t op;
  66         compat_int_t flags;
  67         compat_int_t datalen;
  68         compat_caddr_t data;
  69 };
  70
  71 static int compat_blkpg_ioctl(struct block_device *bdev,
  72                               struct compat_blkpg_ioctl_arg __user *arg)
  73 {
  74         compat_caddr_t udata;
  75         int op;
  76
  77         if (get_user(op, &arg->op) || get_user(udata, &arg->data))
  78                 return -EFAULT;
  79
  80         return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
  81 }
  82 #endif
  83
  84 static int blkdev_reread_part(struct block_device *bdev, fmode_t mode)
  85 {
  86         struct block_device *tmp;
  87
  88         if (!disk_part_scan_enabled(bdev->bd_disk) || bdev_is_partition(bdev))
  89                 return -EINVAL;
  90         if (!capable(CAP_SYS_ADMIN))
  91                 return -EACCES;
  92
  93         /*
  94          * Reopen the device to revalidate the driver state and force a
  95          * partition rescan.
  96          */
  97         mode &= ~FMODE_EXCL;
  98         set_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state);
  99
 100         tmp = blkdev_get_by_dev(bdev->bd_dev, mode, NULL);
 101         if (IS_ERR(tmp))
 102                 return PTR_ERR(tmp);
 103         blkdev_put(tmp, mode);
 104         return 0;
 105 }
 106
 107 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
 108                 unsigned long arg, unsigned long flags)
 109 {
 110         uint64_t range[2];
 111         uint64_t start, len;
 112         struct request_queue *q = bdev_get_queue(bdev);
 113         int err;
 114
 115         if (!(mode & FMODE_WRITE))
 116                 return -EBADF;
 117
 118         if (!blk_queue_discard(q))
 119                 return -EOPNOTSUPP;
 120
 121         if (copy_from_user(range, (void __user *)arg, sizeof(range)))
 122                 return -EFAULT;
 123
 124         start = range[0];
 125         len = range[1];
 126
 127         if (start & 511)
 128                 return -EINVAL;
 129         if (len & 511)
 130                 return -EINVAL;
 131
 132         if (start + len > i_size_read(bdev->bd_inode))
 133                 return -EINVAL;
 134
 135         err = truncate_bdev_range(bdev, mode, start, start + len - 1);
 136         if (err)
 137                 return err;
 138
 139         return blkdev_issue_discard(bdev, start >> 9, len >> 9,
 140                                     GFP_KERNEL, flags);
 141 }
 142
 143 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
 144                 unsigned long arg)
 145 {
 146         uint64_t range[2];
 147         uint64_t start, end, len;
 148         int err;
 149
 150         if (!(mode & FMODE_WRITE))
 151                 return -EBADF;
 152
 153         if (copy_from_user(range, (void __user *)arg, sizeof(range)))
 154                 return -EFAULT;
 155
 156         start = range[0];
 157         len = range[1];
 158         end = start + len - 1;
 159
 160         if (start & 511)
 161                 return -EINVAL;
 162         if (len & 511)
 163                 return -EINVAL;
 164         if (end >= (uint64_t)i_size_read(bdev->bd_inode))
 165                 return -EINVAL;
 166         if (end < start)
 167                 return -EINVAL;
 168
 169         /* Invalidate the page cache, including dirty pages */
 170         err = truncate_bdev_range(bdev, mode, start, end);
 171         if (err)
 172                 return err;
 173
 174         return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
 175                         BLKDEV_ZERO_NOUNMAP);
 176 }
 177
 178 static int put_ushort(unsigned short __user *argp, unsigned short val)
 179 {
 180         return put_user(val, argp);
 181 }
 182
 183 static int put_int(int __user *argp, int val)
 184 {
 185         return put_user(val, argp);
 186 }
 187
 188 static int put_uint(unsigned int __user *argp, unsigned int val)
 189 {
 190         return put_user(val, argp);
 191 }
 192
 193 static int put_long(long __user *argp, long val)
 194 {
 195         return put_user(val, argp);
 196 }
 197
 198 static int put_ulong(unsigned long __user *argp, unsigned long val)
 199 {
 200         return put_user(val, argp);
 201 }
 202
 203 static int put_u64(u64 __user *argp, u64 val)
 204 {
 205         return put_user(val, argp);
 206 }
 207
 208 #ifdef CONFIG_COMPAT
 209 static int compat_put_long(compat_long_t __user *argp, long val)
 210 {
 211         return put_user(val, argp);
 212 }
 213
 214 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
 215 {
 216         return put_user(val, argp);
 217 }
 218 #endif
 219
 220 #ifdef CONFIG_COMPAT
 221 /*
 222  * This is the equivalent of compat_ptr_ioctl(), to be used by block
 223  * drivers that implement only commands that are completely compatible
 224  * between 32-bit and 64-bit user space
 225  */
 226 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
 227                         unsigned cmd, unsigned long arg)
 228 {
 229         struct gendisk *disk = bdev->bd_disk;
 230
 231         if (disk->fops->ioctl)
 232                 return disk->fops->ioctl(bdev, mode, cmd,
 233                                          (unsigned long)compat_ptr(arg));
 234
 235         return -ENOIOCTLCMD;
 236 }
 237 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
 238 #endif
 239
 240 static int blkdev_pr_register(struct block_device *bdev,
 241                 struct pr_registration __user *arg)
 242 {
 243         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 244         struct pr_registration reg;
 245
 246         if (!capable(CAP_SYS_ADMIN))
 247                 return -EPERM;
 248         if (!ops || !ops->pr_register)
 249                 return -EOPNOTSUPP;
 250         if (copy_from_user(&reg, arg, sizeof(reg)))
 251                 return -EFAULT;
 252
 253         if (reg.flags & ~PR_FL_IGNORE_KEY)
 254                 return -EOPNOTSUPP;
 255         return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
 256 }
 257
 258 static int blkdev_pr_reserve(struct block_device *bdev,
 259                 struct pr_reservation __user *arg)
 260 {
 261         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 262         struct pr_reservation rsv;
 263
 264         if (!capable(CAP_SYS_ADMIN))
 265                 return -EPERM;
 266         if (!ops || !ops->pr_reserve)
 267                 return -EOPNOTSUPP;
 268         if (copy_from_user(&rsv, arg, sizeof(rsv)))
 269                 return -EFAULT;
 270
 271         if (rsv.flags & ~PR_FL_IGNORE_KEY)
 272                 return -EOPNOTSUPP;
 273         return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
 274 }
 275
 276 static int blkdev_pr_release(struct block_device *bdev,
 277                 struct pr_reservation __user *arg)
 278 {
 279         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 280         struct pr_reservation rsv;
 281
 282         if (!capable(CAP_SYS_ADMIN))
 283                 return -EPERM;
 284         if (!ops || !ops->pr_release)
 285                 return -EOPNOTSUPP;
 286         if (copy_from_user(&rsv, arg, sizeof(rsv)))
 287                 return -EFAULT;
 288
 289         if (rsv.flags)
 290                 return -EOPNOTSUPP;
 291         return ops->pr_release(bdev, rsv.key, rsv.type);
 292 }
 293
 294 static int blkdev_pr_preempt(struct block_device *bdev,
 295                 struct pr_preempt __user *arg, bool abort)
 296 {
 297         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 298         struct pr_preempt p;
 299
 300         if (!capable(CAP_SYS_ADMIN))
 301                 return -EPERM;
 302         if (!ops || !ops->pr_preempt)
 303                 return -EOPNOTSUPP;
 304         if (copy_from_user(&p, arg, sizeof(p)))
 305                 return -EFAULT;
 306
 307         if (p.flags)
 308                 return -EOPNOTSUPP;
 309         return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
 310 }
 311
 312 static int blkdev_pr_clear(struct block_device *bdev,
 313                 struct pr_clear __user *arg)
 314 {
 315         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 316         struct pr_clear c;
 317
 318         if (!capable(CAP_SYS_ADMIN))
 319                 return -EPERM;
 320         if (!ops || !ops->pr_clear)
 321                 return -EOPNOTSUPP;
 322         if (copy_from_user(&c, arg, sizeof(c)))
 323                 return -EFAULT;
 324
 325         if (c.flags)
 326                 return -EOPNOTSUPP;
 327         return ops->pr_clear(bdev, c.key);
 328 }
 329
 330 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
 331                 unsigned cmd, unsigned long arg)
 332 {
 333         if (!capable(CAP_SYS_ADMIN))
 334                 return -EACCES;
 335         fsync_bdev(bdev);
 336         invalidate_bdev(bdev);
 337         return 0;
 338 }
 339
 340 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
 341                 unsigned cmd, unsigned long arg)
 342 {
 343         int ret, n;
 344
 345         if (!capable(CAP_SYS_ADMIN))
 346                 return -EACCES;
 347
 348         if (get_user(n, (int __user *)arg))
 349                 return -EFAULT;
 350         if (bdev->bd_disk->fops->set_read_only) {
 351                 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
 352                 if (ret)
 353                         return ret;
 354         }
 355         bdev->bd_read_only = n;
 356         return 0;
 357 }
 358
 359 static int blkdev_getgeo(struct block_device *bdev,
 360                 struct hd_geometry __user *argp)
 361 {
 362         struct gendisk *disk = bdev->bd_disk;
 363         struct hd_geometry geo;
 364         int ret;
 365
 366         if (!argp)
 367                 return -EINVAL;
 368         if (!disk->fops->getgeo)
 369                 return -ENOTTY;
 370
 371         /*
 372          * We need to set the startsect first, the driver may
 373          * want to override it.
 374          */
 375         memset(&geo, 0, sizeof(geo));
 376         geo.start = get_start_sect(bdev);
 377         ret = disk->fops->getgeo(bdev, &geo);
 378         if (ret)
 379                 return ret;
 380         if (copy_to_user(argp, &geo, sizeof(geo)))
 381                 return -EFAULT;
 382         return 0;
 383 }
 384
 385 #ifdef CONFIG_COMPAT
 386 struct compat_hd_geometry {
 387         unsigned char heads;
 388         unsigned char sectors;
 389         unsigned short cylinders;
 390         u32 start;
 391 };
 392
 393 static int compat_hdio_getgeo(struct block_device *bdev,
 394                               struct compat_hd_geometry __user *ugeo)
 395 {
 396         struct gendisk *disk = bdev->bd_disk;
 397         struct hd_geometry geo;
 398         int ret;
 399
 400         if (!ugeo)
 401                 return -EINVAL;
 402         if (!disk->fops->getgeo)
 403                 return -ENOTTY;
 404
 405         memset(&geo, 0, sizeof(geo));
 406         /*
 407          * We need to set the startsect first, the driver may
 408          * want to override it.
 409          */
 410         geo.start = get_start_sect(bdev);
 411         ret = disk->fops->getgeo(bdev, &geo);
 412         if (ret)
 413                 return ret;
 414
 415         ret = copy_to_user(ugeo, &geo, 4);
 416         ret |= put_user(geo.start, &ugeo->start);
 417         if (ret)
 418                 ret = -EFAULT;
 419
 420         return ret;
 421 }
 422 #endif
 423
 424 /* set the logical block size */
 425 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
 426                 int __user *argp)
 427 {
 428         int ret, n;
 429
 430         if (!capable(CAP_SYS_ADMIN))
 431                 return -EACCES;
 432         if (!argp)
 433                 return -EINVAL;
 434         if (get_user(n, argp))
 435                 return -EFAULT;
 436
 437         if (mode & FMODE_EXCL)
 438                 return set_blocksize(bdev, n);
 439
 440         if (IS_ERR(blkdev_get_by_dev(bdev->bd_dev, mode | FMODE_EXCL, &bdev)))
 441                 return -EBUSY;
 442         ret = set_blocksize(bdev, n);
 443         blkdev_put(bdev, mode | FMODE_EXCL);
 444
 445         return ret;
 446 }
 447
 448 /*
 449  * Common commands that are handled the same way on native and compat
 450  * user space. Note the separate arg/argp parameters that are needed
 451  * to deal with the compat_ptr() conversion.
 452  */
 453 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
 454                                 unsigned cmd, unsigned long arg, void __user *argp)
 455 {
 456         unsigned int max_sectors;
 457
 458         switch (cmd) {
 459         case BLKFLSBUF:
 460                 return blkdev_flushbuf(bdev, mode, cmd, arg);
 461         case BLKROSET:
 462                 return blkdev_roset(bdev, mode, cmd, arg);
 463         case BLKDISCARD:
 464                 return blk_ioctl_discard(bdev, mode, arg, 0);
 465         case BLKSECDISCARD:
 466                 return blk_ioctl_discard(bdev, mode, arg,
 467                                 BLKDEV_DISCARD_SECURE);
 468         case BLKZEROOUT:
 469                 return blk_ioctl_zeroout(bdev, mode, arg);
 470         case BLKREPORTZONE:
 471                 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
 472         case BLKRESETZONE:
 473         case BLKOPENZONE:
 474         case BLKCLOSEZONE:
 475         case BLKFINISHZONE:
 476                 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
 477         case BLKGETZONESZ:
 478                 return put_uint(argp, bdev_zone_sectors(bdev));
 479         case BLKGETNRZONES:
 480                 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
 481         case BLKROGET:
 482                 return put_int(argp, bdev_read_only(bdev) != 0);
 483         case BLKSSZGET: /* get block device logical block size */
 484                 return put_int(argp, bdev_logical_block_size(bdev));
 485         case BLKPBSZGET: /* get block device physical block size */
 486                 return put_uint(argp, bdev_physical_block_size(bdev));
 487         case BLKIOMIN:
 488                 return put_uint(argp, bdev_io_min(bdev));
 489         case BLKIOOPT:
 490                 return put_uint(argp, bdev_io_opt(bdev));
 491         case BLKALIGNOFF:
 492                 return put_int(argp, bdev_alignment_offset(bdev));
 493         case BLKDISCARDZEROES:
 494                 return put_uint(argp, 0);
 495         case BLKSECTGET:
 496                 max_sectors = min_t(unsigned int, USHRT_MAX,
 497                                     queue_max_sectors(bdev_get_queue(bdev)));
 498                 return put_ushort(argp, max_sectors);
 499         case BLKROTATIONAL:
 500                 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
 501         case BLKRASET:
 502         case BLKFRASET:
 503                 if(!capable(CAP_SYS_ADMIN))
 504                         return -EACCES;
 505                 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
 506                 return 0;
 507         case BLKRRPART:
 508                 return blkdev_reread_part(bdev, mode);
 509         case BLKTRACESTART:
 510         case BLKTRACESTOP:
 511         case BLKTRACETEARDOWN:
 512                 return blk_trace_ioctl(bdev, cmd, argp);
 513         case IOC_PR_REGISTER:
 514                 return blkdev_pr_register(bdev, argp);
 515         case IOC_PR_RESERVE:
 516                 return blkdev_pr_reserve(bdev, argp);
 517         case IOC_PR_RELEASE:
 518                 return blkdev_pr_release(bdev, argp);
 519         case IOC_PR_PREEMPT:
 520                 return blkdev_pr_preempt(bdev, argp, false);
 521         case IOC_PR_PREEMPT_ABORT:
 522                 return blkdev_pr_preempt(bdev, argp, true);
 523         case IOC_PR_CLEAR:
 524                 return blkdev_pr_clear(bdev, argp);
 525         default:
 526                 return -ENOIOCTLCMD;
 527         }
 528 }
 529
 530 /*
 531  * Always keep this in sync with compat_blkdev_ioctl()
 532  * to handle all incompatible commands in both functions.
 533  *
 534  * New commands must be compatible and go into blkdev_common_ioctl
 535  */
 536 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 537                         unsigned long arg)
 538 {
 539         int ret;
 540         loff_t size;
 541         void __user *argp = (void __user *)arg;
 542
 543         switch (cmd) {
 544         /* These need separate implementations for the data structure */
 545         case HDIO_GETGEO:
 546                 return blkdev_getgeo(bdev, argp);
 547         case BLKPG:
 548                 return blkpg_ioctl(bdev, argp);
 549
 550         /* Compat mode returns 32-bit data instead of 'long' */
 551         case BLKRAGET:
 552         case BLKFRAGET:
 553                 if (!argp)
 554                         return -EINVAL;
 555                 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
 556         case BLKGETSIZE:
 557                 size = i_size_read(bdev->bd_inode);
 558                 if ((size >> 9) > ~0UL)
 559                         return -EFBIG;
 560                 return put_ulong(argp, size >> 9);
 561
 562         /* The data is compatible, but the command number is different */
 563         case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
 564                 return put_int(argp, block_size(bdev));
 565         case BLKBSZSET:
 566                 return blkdev_bszset(bdev, mode, argp);
 567         case BLKGETSIZE64:
 568                 return put_u64(argp, i_size_read(bdev->bd_inode));
 569
 570         /* Incompatible alignment on i386 */
 571         case BLKTRACESETUP:
 572                 return blk_trace_ioctl(bdev, cmd, argp);
 573         default:
 574                 break;
 575         }
 576
 577         ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
 578         if (ret != -ENOIOCTLCMD)
 579                 return ret;
 580
 581         if (!bdev->bd_disk->fops->ioctl)
 582                 return -ENOTTY;
 583         return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
 584 }
 585 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
 586
 587 #ifdef CONFIG_COMPAT
 588
 589 #define BLKBSZGET_32            _IOR(0x12, 112, int)
 590 #define BLKBSZSET_32            _IOW(0x12, 113, int)
 591 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
 592
 593 /* Most of the generic ioctls are handled in the normal fallback path.
 594    This assumes the blkdev's low level compat_ioctl always returns
 595    ENOIOCTLCMD for unknown ioctls. */
 596 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 597 {
 598         int ret;
 599         void __user *argp = compat_ptr(arg);
 600         struct block_device *bdev = I_BDEV(file->f_mapping->host);
 601         struct gendisk *disk = bdev->bd_disk;
 602         fmode_t mode = file->f_mode;
 603         loff_t size;
 604
 605         /*
 606          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 607          * to updated it before every ioctl.
 608          */
 609         if (file->f_flags & O_NDELAY)
 610                 mode |= FMODE_NDELAY;
 611         else
 612                 mode &= ~FMODE_NDELAY;
 613
 614         switch (cmd) {
 615         /* These need separate implementations for the data structure */
 616         case HDIO_GETGEO:
 617                 return compat_hdio_getgeo(bdev, argp);
 618         case BLKPG:
 619                 return compat_blkpg_ioctl(bdev, argp);
 620
 621         /* Compat mode returns 32-bit data instead of 'long' */
 622         case BLKRAGET:
 623         case BLKFRAGET:
 624                 if (!argp)
 625                         return -EINVAL;
 626                 return compat_put_long(argp,
 627                                (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
 628         case BLKGETSIZE:
 629                 size = i_size_read(bdev->bd_inode);
 630                 if ((size >> 9) > ~0UL)
 631                         return -EFBIG;
 632                 return compat_put_ulong(argp, size >> 9);
 633
 634         /* The data is compatible, but the command number is different */
 635         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 636                 return put_int(argp, bdev_logical_block_size(bdev));
 637         case BLKBSZSET_32:
 638                 return blkdev_bszset(bdev, mode, argp);
 639         case BLKGETSIZE64_32:
 640                 return put_u64(argp, i_size_read(bdev->bd_inode));
 641
 642         /* Incompatible alignment on i386 */
 643         case BLKTRACESETUP32:
 644                 return blk_trace_ioctl(bdev, cmd, argp);
 645         default:
 646                 break;
 647         }
 648
 649         ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
 650         if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
 651                 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 652
 653         return ret;
 654 }
 655 #endif