| 1 | /* $Id: VBoxVolInfo.cpp 82968 2020-02-04 10:35:17Z 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) 2012-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 |
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| 20 | /*********************************************************************************************************************************
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| 21 | * Header Files *
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| 22 | *********************************************************************************************************************************/
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| 23 | #include <dirent.h>
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| 24 | extern "C"
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| 25 | {
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| 26 | #define private privatekw
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| 27 | #include <libdevmapper.h>
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| 28 | }
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| 29 | #include <stdio.h>
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| 30 | #include <sys/types.h>
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| 31 | #include <sys/stat.h>
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| 32 | #include <unistd.h>
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| 33 |
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| 34 |
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| 35 | /*********************************************************************************************************************************
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| 36 | * Function Prototypes *
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| 37 | *********************************************************************************************************************************/
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| 38 | void print_dev_name(dev_t devid);
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| 39 |
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| 40 | /*
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| 41 | * Extracts logical volume dependencies via devmapper API and print them out.
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| 42 | */
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| 43 | int main(int argc, char **argv)
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| 44 | {
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| 45 | struct dm_task *dmtask;
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| 46 | struct dm_info dminfo;
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| 47 |
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| 48 | if (argc != 2)
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| 49 | {
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| 50 | fprintf(stderr, "USAGE: %s <volume_name>\n", argv[0]);
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| 51 | return 1;
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| 52 | }
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| 53 |
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| 54 | dmtask = dm_task_create(DM_DEVICE_DEPS);
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| 55 | if (!dmtask)
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| 56 | return 2;
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| 57 |
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| 58 | if (dm_task_set_name(dmtask, argv[1]))
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| 59 | if (dm_task_run(dmtask))
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| 60 | if (dm_task_get_info(dmtask, &dminfo))
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| 61 | {
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| 62 | struct dm_deps *dmdeps = dm_task_get_deps(dmtask);
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| 63 | if (dmdeps)
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| 64 | {
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| 65 | unsigned i;
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| 66 | for (i = 0; i < dmdeps->count; ++i)
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| 67 | print_dev_name(dmdeps->device[i]);
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | dm_task_destroy(dmtask);
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| 72 | return 0;
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| 73 | }
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| 74 |
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| 75 | /*
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| 76 | * Looks up device name by id using /dev directory. Prints it to stdout.
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| 77 | */
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| 78 | void print_dev_name(dev_t devid)
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| 79 | {
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| 80 | char path[PATH_MAX];
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| 81 | struct dirent *de;
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| 82 | DIR *dir = opendir("/dev");
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| 83 |
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| 84 | while ((de = readdir(dir)) != NULL)
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| 85 | {
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| 86 | struct stat st;
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| 87 | snprintf(path, sizeof(path), "/dev/%s", de->d_name);
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| 88 | if (!stat(path, &st))
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| 89 | if (S_ISBLK(st.st_mode))
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| 90 | if (devid == st.st_rdev)
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| 91 | {
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| 92 | puts(de->d_name);
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| 93 | break;
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| 94 | }
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| 95 | }
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| 96 | closedir(dir);
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| 97 | }
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