[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 <stdio.h>
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| 22 | #include <stdlib.h>
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| 23 | #include <string.h>
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| 24 | #include <unistd.h>
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| 25 | #include <mntent.h>
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| 26 | #include <sys/vfs.h>
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| 27 | #include "busybox.h"
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| 28 |
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| 29 | #ifndef CONFIG_FEATURE_HUMAN_READABLE
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| 30 | static long kscale(long b, long bs)
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| 31 | {
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| 32 | return ( b * (long long) bs + KILOBYTE/2 ) / KILOBYTE;
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| 33 | }
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| 34 | #endif
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| 35 |
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| 36 | int df_main(int argc, char **argv)
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| 37 | {
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| 38 | long blocks_used;
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| 39 | long blocks_percent_used;
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| 40 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 41 | unsigned long df_disp_hr = KILOBYTE;
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| 42 | #endif
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| 43 | int status = EXIT_SUCCESS;
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| 44 | unsigned long opt;
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| 45 | FILE *mount_table;
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| 46 | struct mntent *mount_entry;
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| 47 | struct statfs s;
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| 48 | static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
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| 49 | const char *disp_units_hdr = hdr_1k;
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| 50 |
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| 51 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 52 | bb_opt_complementally = "h-km:k-hm:m-hk";
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| 53 | opt = bb_getopt_ulflags(argc, argv, "hmk");
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| 54 | if(opt & 1) {
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| 55 | df_disp_hr = 0;
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| 56 | disp_units_hdr = " Size";
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| 57 | }
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| 58 | if(opt & 2) {
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| 59 | df_disp_hr = MEGABYTE;
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| 60 | disp_units_hdr = "1M-blocks";
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| 61 | }
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| 62 | #else
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| 63 | opt = bb_getopt_ulflags(argc, argv, "k");
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| 64 | #endif
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| 65 |
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| 66 | bb_printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
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| 67 | "", disp_units_hdr);
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| 68 |
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| 69 | mount_table = NULL;
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| 70 | argv += optind;
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| 71 | if (optind >= argc) {
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| 72 | if (!(mount_table = setmntent(bb_path_mtab_file, "r"))) {
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| 73 | bb_perror_msg_and_die(bb_path_mtab_file);
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| 74 | }
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| 75 | }
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| 76 |
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| 77 | do {
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| 78 | const char *device;
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| 79 | const char *mount_point;
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| 80 |
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| 81 | if (mount_table) {
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| 82 | if (!(mount_entry = getmntent(mount_table))) {
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| 83 | endmntent(mount_table);
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| 84 | break;
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| 85 | }
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| 86 | } else {
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| 87 | if (!(mount_point = *argv++)) {
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| 88 | break;
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| 89 | }
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| 90 | if (!(mount_entry = find_mount_point(mount_point, bb_path_mtab_file))) {
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| 91 | bb_error_msg("%s: can't find mount point.", mount_point);
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| 92 | SET_ERROR:
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| 93 | status = EXIT_FAILURE;
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| 94 | continue;
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | device = mount_entry->mnt_fsname;
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| 99 | mount_point = mount_entry->mnt_dir;
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| 100 |
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| 101 | if (statfs(mount_point, &s) != 0) {
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| 102 | bb_perror_msg("%s", mount_point);
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| 103 | goto SET_ERROR;
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| 104 | }
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| 105 |
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| 106 | if ((s.f_blocks > 0) || !mount_table){
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| 107 | blocks_used = s.f_blocks - s.f_bfree;
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| 108 | blocks_percent_used = 0;
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| 109 | if (blocks_used + s.f_bavail) {
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| 110 | blocks_percent_used = (((long long) blocks_used) * 100
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| 111 | + (blocks_used + s.f_bavail)/2
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| 112 | ) / (blocks_used + s.f_bavail);
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| 113 | }
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| 114 |
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| 115 | if (strcmp(device, "rootfs") == 0) {
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| 116 | continue;
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| 117 | } else if (strcmp(device, "/dev/root") == 0) {
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| 118 | /* Adjusts device to be the real root device,
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| 119 | * or leaves device alone if it can't find it */
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| 120 | if ((device = find_block_device("/")) == NULL) {
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| 121 | goto SET_ERROR;
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| 122 | }
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| 123 | }
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| 124 |
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| 125 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 126 | bb_printf("%-20s %9s ", device,
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| 127 | make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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| 128 |
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| 129 | bb_printf("%9s ",
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| 130 | make_human_readable_str( (s.f_blocks - s.f_bfree),
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| 131 | s.f_bsize, df_disp_hr));
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| 132 |
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| 133 | bb_printf("%9s %3ld%% %s\n",
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| 134 | make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
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| 135 | blocks_percent_used, mount_point);
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| 136 | #else
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| 137 | bb_printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
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| 138 | device,
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| 139 | kscale(s.f_blocks, s.f_bsize),
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| 140 | kscale(s.f_blocks-s.f_bfree, s.f_bsize),
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| 141 | kscale(s.f_bavail, s.f_bsize),
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| 142 | blocks_percent_used, mount_point);
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| 143 | #endif
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| 144 | }
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| 145 |
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| 146 | } while (1);
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| 147 |
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| 148 | bb_fflush_stdout_and_exit(status);
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| 149 | }
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