| 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 source tree.
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| 9 | */
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| 10 |
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| 11 | /* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
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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 | * Aug 28, 2008 Bernhard Reutner-Fischer
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| 21 | *
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| 22 | * Implement -P and -B; better coreutils compat; cleanup
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| 23 | */
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| 24 |
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| 25 | //usage:#define df_trivial_usage
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| 26 | //usage: "[-Pk"
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| 27 | //usage: IF_FEATURE_HUMAN_READABLE("mh")
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| 28 | //usage: "T"
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| 29 | //usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
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| 30 | //usage: "] [FILESYSTEM]..."
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| 31 | //usage:#define df_full_usage "\n\n"
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| 32 | //usage: "Print filesystem usage statistics\n"
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| 33 | //usage: "\n -P POSIX output format"
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| 34 | //usage: "\n -k 1024-byte blocks (default)"
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| 35 | //usage: IF_FEATURE_HUMAN_READABLE(
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| 36 | //usage: "\n -m 1M-byte blocks"
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| 37 | //usage: "\n -h Human readable (e.g. 1K 243M 2G)"
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| 38 | //usage: )
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| 39 | //usage: "\n -T Print filesystem type"
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| 40 | //usage: IF_FEATURE_DF_FANCY(
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| 41 | //usage: "\n -a Show all filesystems"
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| 42 | //usage: "\n -i Inodes"
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| 43 | //usage: "\n -B SIZE Blocksize"
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| 44 | //usage: )
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| 45 | //usage:
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| 46 | //usage:#define df_example_usage
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| 47 | //usage: "$ df\n"
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| 48 | //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
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| 49 | //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
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| 50 | //usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
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| 51 | //usage: "$ df /dev/sda3\n"
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| 52 | //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
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| 53 | //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
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| 54 | //usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
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| 55 | //usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
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| 56 | //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
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| 57 | //usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
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| 58 | //usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
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| 59 | //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
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| 60 |
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| 61 | #include <mntent.h>
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| 62 | #include <sys/vfs.h>
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| 63 | #include "libbb.h"
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| 64 | #include "unicode.h"
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| 65 |
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| 66 | #if !ENABLE_FEATURE_HUMAN_READABLE
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| 67 | static unsigned long kscale(unsigned long b, unsigned long bs)
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| 68 | {
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| 69 | return (b * (unsigned long long) bs + 1024/2) / 1024;
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| 70 | }
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| 71 | #endif
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| 72 |
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| 73 | int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 74 | int df_main(int argc UNUSED_PARAM, char **argv)
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| 75 | {
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| 76 | unsigned long blocks_used;
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| 77 | unsigned blocks_percent_used;
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| 78 | unsigned long df_disp_hr = 1024;
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| 79 | int status = EXIT_SUCCESS;
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| 80 | unsigned opt;
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| 81 | FILE *mount_table;
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| 82 | struct mntent *mount_entry;
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| 83 | struct statfs s;
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| 84 |
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| 85 | enum {
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| 86 | OPT_KILO = (1 << 0),
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| 87 | OPT_POSIX = (1 << 1),
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| 88 | OPT_FSTYPE = (1 << 2),
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| 89 | OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
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| 90 | OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
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| 91 | OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
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| 92 | OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
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| 93 | OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
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| 94 | };
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| 95 | const char *disp_units_hdr = NULL;
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| 96 | char *chp;
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| 97 |
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| 98 | init_unicode();
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| 99 |
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| 100 | #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
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| 101 | opt_complementary = "k-mB:m-Bk:B-km";
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| 102 | #elif ENABLE_FEATURE_HUMAN_READABLE
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| 103 | opt_complementary = "k-m:m-k";
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| 104 | #endif
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| 105 | opt = getopt32(argv, "kPT"
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| 106 | IF_FEATURE_DF_FANCY("aiB:")
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| 107 | IF_FEATURE_HUMAN_READABLE("hm")
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| 108 | IF_FEATURE_DF_FANCY(, &chp));
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| 109 | if (opt & OPT_MEGA)
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| 110 | df_disp_hr = 1024*1024;
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| 111 |
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| 112 | if (opt & OPT_BSIZE)
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| 113 | df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
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| 114 |
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| 115 | /* From the manpage of df from coreutils-6.10:
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| 116 | * Disk space is shown in 1K blocks by default, unless the environment
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| 117 | * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
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| 118 | */
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| 119 | if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
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| 120 | df_disp_hr = 512;
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| 121 |
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| 122 | if (opt & OPT_HUMAN) {
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| 123 | df_disp_hr = 0;
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| 124 | disp_units_hdr = " Size";
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| 125 | }
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| 126 | if (opt & OPT_INODE)
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| 127 | disp_units_hdr = " Inodes";
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| 128 |
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| 129 | if (disp_units_hdr == NULL) {
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| 130 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 131 | disp_units_hdr = xasprintf("%s-blocks",
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| 132 | /* print df_disp_hr, show no fractionals,
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| 133 | * use suffixes if OPT_POSIX is set in opt */
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| 134 | make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
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| 135 | );
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| 136 | #else
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| 137 | disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
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| 138 | #endif
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| 139 | }
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| 140 |
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| 141 | printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
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| 142 | (opt & OPT_FSTYPE) ? "Type " : "",
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| 143 | disp_units_hdr,
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| 144 | (opt & OPT_POSIX) ? "Capacity" : "Use%");
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| 145 |
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| 146 | mount_table = NULL;
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| 147 | argv += optind;
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| 148 | if (!argv[0]) {
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| 149 | mount_table = setmntent(bb_path_mtab_file, "r");
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| 150 | if (!mount_table)
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| 151 | bb_perror_msg_and_die(bb_path_mtab_file);
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| 152 | }
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| 153 |
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| 154 | while (1) {
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| 155 | const char *device;
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| 156 | const char *mount_point;
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| 157 | const char *fs_type;
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| 158 |
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| 159 | if (mount_table) {
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| 160 | mount_entry = getmntent(mount_table);
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| 161 | if (!mount_entry) {
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| 162 | endmntent(mount_table);
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| 163 | break;
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| 164 | }
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| 165 | } else {
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| 166 | mount_point = *argv++;
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| 167 | if (!mount_point)
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| 168 | break;
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| 169 | mount_entry = find_mount_point(mount_point, 1);
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| 170 | if (!mount_entry) {
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| 171 | bb_error_msg("%s: can't find mount point", mount_point);
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| 172 | set_error:
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| 173 | status = EXIT_FAILURE;
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| 174 | continue;
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| 175 | }
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| 176 | }
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| 177 |
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| 178 | device = mount_entry->mnt_fsname;
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| 179 | mount_point = mount_entry->mnt_dir;
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| 180 | fs_type = mount_entry->mnt_type;
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| 181 |
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| 182 | if (statfs(mount_point, &s) != 0) {
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| 183 | bb_simple_perror_msg(mount_point);
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| 184 | goto set_error;
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| 185 | }
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| 186 |
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| 187 | if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
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| 188 | if (opt & OPT_INODE) {
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| 189 | s.f_blocks = s.f_files;
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| 190 | s.f_bavail = s.f_bfree = s.f_ffree;
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| 191 | s.f_bsize = 1;
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| 192 |
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| 193 | if (df_disp_hr)
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| 194 | df_disp_hr = 1;
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| 195 | }
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| 196 | blocks_used = s.f_blocks - s.f_bfree;
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| 197 | blocks_percent_used = 0;
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| 198 | if (blocks_used + s.f_bavail) {
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| 199 | blocks_percent_used = (blocks_used * 100ULL
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| 200 | + (blocks_used + s.f_bavail)/2
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| 201 | ) / (blocks_used + s.f_bavail);
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| 202 | }
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| 203 |
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| 204 | /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
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| 205 | if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
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| 206 | continue;
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| 207 |
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| 208 | #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
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| 209 | if (strcmp(device, "/dev/root") == 0) {
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| 210 | /* Adjusts device to be the real root device,
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| 211 | * or leaves device alone if it can't find it */
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| 212 | device = find_block_device("/");
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| 213 | if (!device) {
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| 214 | goto set_error;
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| 215 | }
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| 216 | }
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| 217 | #endif
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| 218 |
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| 219 | #if ENABLE_UNICODE_SUPPORT
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| 220 | {
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| 221 | uni_stat_t uni_stat;
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| 222 | char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
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| 223 | if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
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| 224 | printf("%s\n%20s", uni_dev, "");
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| 225 | } else {
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| 226 | printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
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| 227 | }
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| 228 | free(uni_dev);
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| 229 | if (opt & OPT_FSTYPE) {
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| 230 | char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
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| 231 | if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
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| 232 | printf(" %s\n%31s", uni_type, "");
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| 233 | else
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| 234 | printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
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| 235 | free(uni_type);
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| 236 | }
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| 237 | }
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| 238 | #else
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| 239 | if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
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| 240 | printf("\n%-20s", "");
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| 241 | if (opt & OPT_FSTYPE) {
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| 242 | if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
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| 243 | printf("\n%-30s", "");
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| 244 | }
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| 245 | #endif
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| 246 |
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| 247 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 248 | printf(" %9s ",
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| 249 | /* f_blocks x f_bsize / df_disp_hr, show one fractional,
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| 250 | * use suffixes if df_disp_hr == 0 */
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| 251 | make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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| 252 |
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| 253 | printf(" %9s " + 1,
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| 254 | /* EXPR x f_bsize / df_disp_hr, show one fractional,
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| 255 | * use suffixes if df_disp_hr == 0 */
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| 256 | make_human_readable_str((s.f_blocks - s.f_bfree),
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| 257 | s.f_bsize, df_disp_hr));
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| 258 |
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| 259 | printf("%9s %3u%% %s\n",
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| 260 | /* f_bavail x f_bsize / df_disp_hr, show one fractional,
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| 261 | * use suffixes if df_disp_hr == 0 */
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| 262 | make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
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| 263 | blocks_percent_used, mount_point);
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| 264 | #else
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| 265 | printf(" %9lu %9lu %9lu %3u%% %s\n",
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| 266 | kscale(s.f_blocks, s.f_bsize),
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| 267 | kscale(s.f_blocks - s.f_bfree, s.f_bsize),
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| 268 | kscale(s.f_bavail, s.f_bsize),
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| 269 | blocks_percent_used, mount_point);
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| 270 | #endif
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| 271 | }
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| 272 | }
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| 273 |
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| 274 | return status;
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| 275 | }
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