LXR busybox/coreutils/df.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini df implementation for busybox
   4 *
   5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
   7 *
   8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9 */
  10
  11/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
  12/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
  13
  14/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  15 *
  16 * Size reduction.  Removed floating point dependency.  Added error checking
  17 * on output.  Output stats on 0-sized filesystems if specifically listed on
  18 * the command line.  Properly round *-blocks, Used, and Available quantities.
  19 *
  20 * Aug 28, 2008      Bernhard Reutner-Fischer
  21 *
  22 * Implement -P and -B; better coreutils compat; cleanup
  23 */
  24
  25//usage:#define df_trivial_usage
  26//usage:        "[-Pk"
  27//usage:        IF_FEATURE_HUMAN_READABLE("mh")
  28//usage:        "T"
  29//usage:        IF_FEATURE_DF_FANCY("ai] [-B SIZE")
  30//usage:        "] [FILESYSTEM]..."
  31//usage:#define df_full_usage "\n\n"
  32//usage:       "Print filesystem usage statistics\n"
  33//usage:     "\n        -P      POSIX output format"
  34//usage:     "\n        -k      1024-byte blocks (default)"
  35//usage:        IF_FEATURE_HUMAN_READABLE(
  36//usage:     "\n        -m      1M-byte blocks"
  37//usage:     "\n        -h      Human readable (e.g. 1K 243M 2G)"
  38//usage:        )
  39//usage:     "\n        -T      Print filesystem type"
  40//usage:        IF_FEATURE_DF_FANCY(
  41//usage:     "\n        -a      Show all filesystems"
  42//usage:     "\n        -i      Inodes"
  43//usage:     "\n        -B SIZE Blocksize"
  44//usage:        )
  45//usage:
  46//usage:#define df_example_usage
  47//usage:       "$ df\n"
  48//usage:       "Filesystem           1K-blocks      Used Available Use% Mounted on\n"
  49//usage:       "/dev/sda3              8690864   8553540    137324  98% /\n"
  50//usage:       "/dev/sda1                64216     36364     27852  57% /boot\n"
  51//usage:       "$ df /dev/sda3\n"
  52//usage:       "Filesystem           1K-blocks      Used Available Use% Mounted on\n"
  53//usage:       "/dev/sda3              8690864   8553540    137324  98% /\n"
  54//usage:       "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
  55//usage:       "Filesystem         512B-blocks      Used Available Use% Mounted on\n"
  56//usage:       "/dev/sda3             17381728  17107080    274648  98% /\n"
  57//usage:       "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
  58//usage:       "Filesystem          512-blocks      Used Available Capacity Mounted on\n"
  59//usage:       "/dev/sda3             17381728  17107080    274648      98% /\n"
  60
  61#include <mntent.h>
  62#include <sys/vfs.h>
  63#include "libbb.h"
  64#include "unicode.h"
  65
  66#if !ENABLE_FEATURE_HUMAN_READABLE
  67static unsigned long kscale(unsigned long b, unsigned long bs)
  68{
  69        return (b * (unsigned long long) bs + 1024/2) / 1024;
  70}
  71#endif
  72
  73int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  74int df_main(int argc UNUSED_PARAM, char **argv)
  75{
  76        unsigned long blocks_used;
  77        unsigned blocks_percent_used;
  78        unsigned long df_disp_hr = 1024;
  79        int status = EXIT_SUCCESS;
  80        unsigned opt;
  81        FILE *mount_table;
  82        struct mntent *mount_entry;
  83        struct statfs s;
  84
  85        enum {
  86                OPT_KILO  = (1 << 0),
  87                OPT_POSIX = (1 << 1),
  88                OPT_FSTYPE  = (1 << 2),
  89                OPT_ALL   = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
  90                OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
  91                OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
  92                OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
  93                OPT_MEGA  = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
  94        };
  95        const char *disp_units_hdr = NULL;
  96        char *chp;
  97
  98        init_unicode();
  99
 100#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
 101        opt_complementary = "k-mB:m-Bk:B-km";
 102#elif ENABLE_FEATURE_HUMAN_READABLE
 103        opt_complementary = "k-m:m-k";
 104#endif
 105        opt = getopt32(argv, "kPT"
 106                        IF_FEATURE_DF_FANCY("aiB:")
 107                        IF_FEATURE_HUMAN_READABLE("hm")
 108                        IF_FEATURE_DF_FANCY(, &chp));
 109        if (opt & OPT_MEGA)
 110                df_disp_hr = 1024*1024;
 111
 112        if (opt & OPT_BSIZE)
 113                df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
 114
 115        /* From the manpage of df from coreutils-6.10:
 116         * Disk space is shown in 1K blocks by default, unless the environment
 117         * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
 118         */
 119        if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
 120                df_disp_hr = 512;
 121
 122        if (opt & OPT_HUMAN) {
 123                df_disp_hr = 0;
 124                disp_units_hdr = "     Size";
 125        }
 126        if (opt & OPT_INODE)
 127                disp_units_hdr = "   Inodes";
 128
 129        if (disp_units_hdr == NULL) {
 130#if ENABLE_FEATURE_HUMAN_READABLE
 131                disp_units_hdr = xasprintf("%s-blocks",
 132                        /* print df_disp_hr, show no fractionals,
 133                         * use suffixes if OPT_POSIX is set in opt */
 134                        make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
 135                );
 136#else
 137                disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
 138#endif
 139        }
 140
 141        printf("Filesystem           %s%-15sUsed Available %s Mounted on\n",
 142                        (opt & OPT_FSTYPE) ? "Type       " : "",
 143                        disp_units_hdr,
 144                        (opt & OPT_POSIX) ? "Capacity" : "Use%");
 145
 146        mount_table = NULL;
 147        argv += optind;
 148        if (!argv[0]) {
 149                mount_table = setmntent(bb_path_mtab_file, "r");
 150                if (!mount_table)
 151                        bb_perror_msg_and_die(bb_path_mtab_file);
 152        }
 153
 154        while (1) {
 155                const char *device;
 156                const char *mount_point;
 157                const char *fs_type;
 158
 159                if (mount_table) {
 160                        mount_entry = getmntent(mount_table);
 161                        if (!mount_entry) {
 162                                endmntent(mount_table);
 163                                break;
 164                        }
 165                } else {
 166                        mount_point = *argv++;
 167                        if (!mount_point)
 168                                break;
 169                        mount_entry = find_mount_point(mount_point, 1);
 170                        if (!mount_entry) {
 171                                bb_error_msg("%s: can't find mount point", mount_point);
 172 set_error:
 173                                status = EXIT_FAILURE;
 174                                continue;
 175                        }
 176                }
 177
 178                device = mount_entry->mnt_fsname;
 179                mount_point = mount_entry->mnt_dir;
 180                fs_type = mount_entry->mnt_type;
 181
 182                if (statfs(mount_point, &s) != 0) {
 183                        bb_simple_perror_msg(mount_point);
 184                        goto set_error;
 185                }
 186
 187                if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
 188                        if (opt & OPT_INODE) {
 189                                s.f_blocks = s.f_files;
 190                                s.f_bavail = s.f_bfree = s.f_ffree;
 191                                s.f_bsize = 1;
 192
 193                                if (df_disp_hr)
 194                                        df_disp_hr = 1;
 195                        }
 196                        blocks_used = s.f_blocks - s.f_bfree;
 197                        blocks_percent_used = 0;
 198                        if (blocks_used + s.f_bavail) {
 199                                blocks_percent_used = (blocks_used * 100ULL
 200                                                + (blocks_used + s.f_bavail)/2
 201                                                ) / (blocks_used + s.f_bavail);
 202                        }
 203
 204                        /* GNU coreutils 6.10 skips certain mounts, try to be compatible.  */
 205                        if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
 206                                continue;
 207
 208#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
 209                        if (strcmp(device, "/dev/root") == 0) {
 210                                /* Adjusts device to be the real root device,
 211                                 * or leaves device alone if it can't find it */
 212                                device = find_block_device("/");
 213                                if (!device) {
 214                                        goto set_error;
 215                                }
 216                        }
 217#endif
 218
 219#if ENABLE_UNICODE_SUPPORT
 220                        {
 221                                uni_stat_t uni_stat;
 222                                char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
 223                                if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
 224                                        printf("%s\n%20s", uni_dev, "");
 225                                } else {
 226                                        printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
 227                                }
 228                                free(uni_dev);
 229                                if (opt & OPT_FSTYPE) {
 230                                        char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
 231                                        if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
 232                                                printf(" %s\n%31s", uni_type, "");
 233                                        else
 234                                                printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
 235                                        free(uni_type);
 236                                }
 237                        }
 238#else
 239                        if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
 240                                printf("\n%-20s", "");
 241                        if (opt & OPT_FSTYPE) {
 242                                if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
 243                                        printf("\n%-30s", "");
 244                        }
 245#endif
 246
 247#if ENABLE_FEATURE_HUMAN_READABLE
 248                        printf(" %9s ",
 249                                /* f_blocks x f_bsize / df_disp_hr, show one fractional,
 250                                 * use suffixes if df_disp_hr == 0 */
 251                                make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
 252
 253                        printf(" %9s " + 1,
 254                                /* EXPR x f_bsize / df_disp_hr, show one fractional,
 255                                 * use suffixes if df_disp_hr == 0 */
 256                                make_human_readable_str((s.f_blocks - s.f_bfree),
 257                                                s.f_bsize, df_disp_hr));
 258
 259                        printf("%9s %3u%% %s\n",
 260                                /* f_bavail x f_bsize / df_disp_hr, show one fractional,
 261                                 * use suffixes if df_disp_hr == 0 */
 262                                make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
 263                                blocks_percent_used, mount_point);
 264#else
 265                        printf(" %9lu %9lu %9lu %3u%% %s\n",
 266                                kscale(s.f_blocks, s.f_bsize),
 267                                kscale(s.f_blocks - s.f_bfree, s.f_bsize),
 268                                kscale(s.f_bavail, s.f_bsize),
 269                                blocks_percent_used, mount_point);
 270#endif
 271                }
 272        }
 273
 274        return status;
 275}
 276