zvol_id.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or https://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 /*
   22  * Copyright (c) 2011, Fajar A. Nugraha.  All rights reserved.
   23  * Use is subject to license terms.
   24  */
   25 
   26 #include <ctype.h>
   27 #include <errno.h>
   28 #include <fcntl.h>
   29 #include <stdio.h>
   30 #include <string.h>
   31 #include <unistd.h>
   32 #include <sys/fs/zfs.h>
   33 #include <sys/ioctl.h>
   34 #include <sys/stat.h>
   35 
   36 #if defined(ZFS_ASAN_ENABLED)
   37 /*
   38  * zvol_id is invoked by udev with the help of ptrace()
   39  * making sanitized binary with leak detection croak
   40  * because of tracing mechanisms collision
   41  */
   42 extern const char *__asan_default_options(void);
   43 
   44 const char *__asan_default_options(void) {
   45         return ("abort_on_error=true:halt_on_error=true:"
   46                 "allocator_may_return_null=true:disable_coredump=false:"
   47                 "detect_stack_use_after_return=true:detect_leaks=false");
   48 }
   49 #endif
   50 
   51 int
   52 main(int argc, const char *const *argv)
   53 {
   54         if (argc != 2) {
   55                 fprintf(stderr, "usage: %s /dev/zdX\n", argv[0]);
   56                 return (1);
   57         }
   58         const char *dev_name = argv[1];
   59 
   60         int fd;
   61         struct stat sb;
   62         if ((fd = open(dev_name, O_RDONLY|O_CLOEXEC)) == -1 ||
   63             fstat(fd, &sb) != 0) {
   64                 fprintf(stderr, "%s: %s\n", dev_name, strerror(errno));
   65                 return (1);
   66         }
   67 
   68         char zvol_name[MAXNAMELEN + strlen("-part") + 10];
   69         if (ioctl(fd, BLKZNAME, zvol_name) == -1) {
   70                 fprintf(stderr, "%s: BLKZNAME: %s\n",
   71                     dev_name, strerror(errno));
   72                 return (1);
   73         }
   74 
   75         unsigned int dev_part = minor(sb.st_rdev) % ZVOL_MINORS;
   76         if (dev_part != 0)
   77                 sprintf(zvol_name + strlen(zvol_name), "-part%u", dev_part);
   78 
   79         for (size_t i = 0; i < strlen(zvol_name); ++i)
   80                 if (isblank(zvol_name[i]))
   81                         zvol_name[i] = '+';
   82 
   83         puts(zvol_name);
   84 
   85         return (0);
   86 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/udev/zvol_id.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/udev/zvol_id.c