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3fb0942cc5
If a zvol has more than 15 partitions, the minor device number exhausts the slot count reserved for partitions next to the zvol itself. As a result, the minor number cannot be used to determine the partition number for the higher partition, and doing so results in wrong named symlinks being generated by udev. Since the partition number is encoded in the block device name anyway, let's just extract it from there instead. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de> Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> Closes #15904 Closes #15970
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011, Fajar A. Nugraha. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/fs/zfs.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#if defined(ZFS_ASAN_ENABLED)
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/*
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* zvol_id is invoked by udev with the help of ptrace()
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* making sanitized binary with leak detection croak
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* because of tracing mechanisms collision
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*/
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extern const char *__asan_default_options(void);
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const char *__asan_default_options(void) {
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return ("abort_on_error=true:halt_on_error=true:"
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"allocator_may_return_null=true:disable_coredump=false:"
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"detect_stack_use_after_return=true:detect_leaks=false");
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}
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#endif
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int
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main(int argc, const char *const *argv)
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{
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if (argc != 2 || strncmp(argv[1], "/dev/zd", 7) != 0) {
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fprintf(stderr, "usage: %s /dev/zdX\n", argv[0]);
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return (1);
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}
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const char *dev_name = argv[1];
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int fd;
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struct stat sb;
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if ((fd = open(dev_name, O_RDONLY|O_CLOEXEC)) == -1 ||
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fstat(fd, &sb) != 0) {
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fprintf(stderr, "%s: %s\n", dev_name, strerror(errno));
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return (1);
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}
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char zvol_name[MAXNAMELEN + strlen("-part") + 10];
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if (ioctl(fd, BLKZNAME, zvol_name) == -1) {
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fprintf(stderr, "%s: BLKZNAME: %s\n",
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dev_name, strerror(errno));
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return (1);
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}
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const char *dev_part = strrchr(dev_name, 'p');
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if (dev_part != NULL) {
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sprintf(zvol_name + strlen(zvol_name), "-part%s", dev_part + 1);
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}
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for (size_t i = 0; i < strlen(zvol_name); ++i)
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if (isblank(zvol_name[i]))
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zvol_name[i] = '+';
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puts(zvol_name);
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return (0);
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}
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