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 } 87