| 1 | /* $Id: VBoxVolInfo.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Apps - VBoxVolInfo, Volume information tool.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 |
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| 30 | /*********************************************************************************************************************************
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| 31 | * Header Files *
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| 32 | *********************************************************************************************************************************/
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| 33 | #include <dirent.h>
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| 34 | extern "C"
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| 35 | {
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| 36 | #define private privatekw
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| 37 | #include <libdevmapper.h>
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| 38 | }
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| 39 | #include <stdio.h>
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| 40 | #include <sys/types.h>
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| 41 | #include <sys/stat.h>
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| 42 | #include <unistd.h>
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| 43 |
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| 44 |
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| 45 | /*********************************************************************************************************************************
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| 46 | * Function Prototypes *
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| 47 | *********************************************************************************************************************************/
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| 48 | void print_dev_name(dev_t devid);
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| 49 |
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| 50 | /*
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| 51 | * Extracts logical volume dependencies via devmapper API and print them out.
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| 52 | */
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| 53 | int main(int argc, char **argv)
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| 54 | {
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| 55 | struct dm_task *dmtask;
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| 56 | struct dm_info dminfo;
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| 57 |
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| 58 | if (argc != 2)
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| 59 | {
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| 60 | fprintf(stderr, "USAGE: %s <volume_name>\n", argv[0]);
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| 61 | return 1;
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| 62 | }
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| 63 |
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| 64 | dmtask = dm_task_create(DM_DEVICE_DEPS);
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| 65 | if (!dmtask)
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| 66 | return 2;
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| 67 |
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| 68 | if (dm_task_set_name(dmtask, argv[1]))
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| 69 | if (dm_task_run(dmtask))
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| 70 | if (dm_task_get_info(dmtask, &dminfo))
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| 71 | {
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| 72 | struct dm_deps *dmdeps = dm_task_get_deps(dmtask);
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| 73 | if (dmdeps)
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| 74 | {
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| 75 | unsigned i;
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| 76 | for (i = 0; i < dmdeps->count; ++i)
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| 77 | print_dev_name(dmdeps->device[i]);
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | dm_task_destroy(dmtask);
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| 82 | return 0;
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| 83 | }
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| 84 |
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| 85 | /*
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| 86 | * Looks up device name by id using /dev directory. Prints it to stdout.
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| 87 | */
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| 88 | void print_dev_name(dev_t devid)
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| 89 | {
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| 90 | char path[PATH_MAX];
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| 91 | struct dirent *de;
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| 92 | DIR *dir = opendir("/dev");
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| 93 |
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| 94 | while ((de = readdir(dir)) != NULL)
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| 95 | {
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| 96 | struct stat st;
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| 97 | snprintf(path, sizeof(path), "/dev/%s", de->d_name);
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| 98 | if (!stat(path, &st))
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| 99 | if (S_ISBLK(st.st_mode))
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| 100 | if (devid == st.st_rdev)
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| 101 | {
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| 102 | puts(de->d_name);
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| 103 | break;
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| 104 | }
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| 105 | }
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| 106 | closedir(dir);
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| 107 | }
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