[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini df implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 9 | */
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| 10 |
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| 11 | /* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
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| 12 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
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| 13 |
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| 14 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 15 | *
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| 16 | * Size reduction. Removed floating point dependency. Added error checking
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| 17 | * on output. Output stats on 0-sized filesystems if specifically listed on
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| 18 | * the command line. Properly round *-blocks, Used, and Available quantities.
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| 19 | */
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| 20 |
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| 21 | #include <mntent.h>
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| 22 | #include <sys/vfs.h>
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[1765] | 23 | #include "libbb.h"
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[821] | 24 |
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[1765] | 25 | #if !ENABLE_FEATURE_HUMAN_READABLE
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| 26 | static unsigned long kscale(unsigned long b, unsigned long bs)
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[821] | 27 | {
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[1765] | 28 | return (b * (unsigned long long) bs + 1024/2) / 1024;
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[821] | 29 | }
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| 30 | #endif
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| 31 |
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[1765] | 32 | int df_main(int argc, char **argv);
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[821] | 33 | int df_main(int argc, char **argv)
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| 34 | {
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[1765] | 35 | unsigned long blocks_used;
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| 36 | unsigned blocks_percent_used;
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| 37 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 38 | unsigned df_disp_hr = 1024;
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[821] | 39 | #endif
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| 40 | int status = EXIT_SUCCESS;
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[1765] | 41 | unsigned opt;
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[821] | 42 | FILE *mount_table;
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| 43 | struct mntent *mount_entry;
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| 44 | struct statfs s;
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[1765] | 45 | /* default display is kilobytes */
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| 46 | const char *disp_units_hdr = "1k-blocks";
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[821] | 47 |
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[1765] | 48 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 49 | opt_complementary = "h-km:k-hm:m-hk";
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| 50 | opt = getopt32(argv, "hmk");
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| 51 | if (opt & 1) {
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| 52 | df_disp_hr = 0;
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| 53 | disp_units_hdr = " Size";
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[821] | 54 | }
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[1765] | 55 | if (opt & 2) {
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| 56 | df_disp_hr = 1024*1024;
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| 57 | disp_units_hdr = "1M-blocks";
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[821] | 58 | }
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| 59 | #else
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[1765] | 60 | opt = getopt32(argv, "k");
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[821] | 61 | #endif
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| 62 |
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[1765] | 63 | printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
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[821] | 64 | "", disp_units_hdr);
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| 65 |
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| 66 | mount_table = NULL;
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| 67 | argv += optind;
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| 68 | if (optind >= argc) {
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[1765] | 69 | mount_table = setmntent(bb_path_mtab_file, "r");
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| 70 | if (!mount_table) {
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[821] | 71 | bb_perror_msg_and_die(bb_path_mtab_file);
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| 72 | }
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| 73 | }
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| 74 |
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[1765] | 75 | while (1) {
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[821] | 76 | const char *device;
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| 77 | const char *mount_point;
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| 78 |
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| 79 | if (mount_table) {
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[1765] | 80 | mount_entry = getmntent(mount_table);
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| 81 | if (!mount_entry) {
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[821] | 82 | endmntent(mount_table);
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| 83 | break;
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| 84 | }
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| 85 | } else {
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[1765] | 86 | mount_point = *argv++;
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| 87 | if (!mount_point) {
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[821] | 88 | break;
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| 89 | }
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[1765] | 90 | mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
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| 91 | if (!mount_entry) {
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| 92 | bb_error_msg("%s: can't find mount point", mount_point);
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| 93 | SET_ERROR:
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[821] | 94 | status = EXIT_FAILURE;
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| 95 | continue;
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| 96 | }
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| 97 | }
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| 98 |
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| 99 | device = mount_entry->mnt_fsname;
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| 100 | mount_point = mount_entry->mnt_dir;
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| 101 |
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| 102 | if (statfs(mount_point, &s) != 0) {
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| 103 | bb_perror_msg("%s", mount_point);
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| 104 | goto SET_ERROR;
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| 105 | }
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| 106 |
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| 107 | if ((s.f_blocks > 0) || !mount_table){
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| 108 | blocks_used = s.f_blocks - s.f_bfree;
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| 109 | blocks_percent_used = 0;
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| 110 | if (blocks_used + s.f_bavail) {
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[1765] | 111 | blocks_percent_used = (blocks_used * 100ULL
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| 112 | + (blocks_used + s.f_bavail)/2
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| 113 | ) / (blocks_used + s.f_bavail);
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[821] | 114 | }
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| 115 |
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| 116 | if (strcmp(device, "rootfs") == 0) {
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| 117 | continue;
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| 118 | } else if (strcmp(device, "/dev/root") == 0) {
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| 119 | /* Adjusts device to be the real root device,
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| 120 | * or leaves device alone if it can't find it */
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[1765] | 121 | device = find_block_device("/");
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| 122 | if (!device) {
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[821] | 123 | goto SET_ERROR;
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| 124 | }
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| 125 | }
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| 126 |
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[1765] | 127 | if (printf("\n%-20s" + 1, device) > 20)
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| 128 | printf("\n%-20s", "");
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| 129 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 130 | printf(" %9s ",
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| 131 | make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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[821] | 132 |
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[1765] | 133 | printf(" %9s " + 1,
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| 134 | make_human_readable_str((s.f_blocks - s.f_bfree),
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| 135 | s.f_bsize, df_disp_hr));
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[821] | 136 |
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[1765] | 137 | printf("%9s %3u%% %s\n",
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| 138 | make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
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| 139 | blocks_percent_used, mount_point);
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[821] | 140 | #else
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[1765] | 141 | printf(" %9lu %9lu %9lu %3u%% %s\n",
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| 142 | kscale(s.f_blocks, s.f_bsize),
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| 143 | kscale(s.f_blocks-s.f_bfree, s.f_bsize),
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| 144 | kscale(s.f_bavail, s.f_bsize),
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| 145 | blocks_percent_used, mount_point);
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[821] | 146 | #endif
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| 147 | }
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[1765] | 148 | }
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[821] | 149 |
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[1765] | 150 | fflush_stdout_and_exit(status);
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[821] | 151 | }
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