321 lines
9.4 KiB
C
321 lines
9.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini df implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Size reduction. Removed floating point dependency. Added error checking
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* on output. Output stats on 0-sized filesystems if specifically listed on
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* the command line. Properly round *-blocks, Used, and Available quantities.
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*
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* Aug 28, 2008 Bernhard Reutner-Fischer
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*
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* Implement -P and -B; better coreutils compat; cleanup
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*/
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//config:config DF
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//config: bool "df (6.8 kb)"
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//config: default y
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//config: help
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//config: df reports the amount of disk space used and available
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//config: on filesystems.
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//config:
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//config:config FEATURE_DF_FANCY
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//config: bool "Enable -a, -i, -B"
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//config: default y
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//config: depends on DF
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//config: help
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//config: -a Show all filesystems
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//config: -i Inodes
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//config: -B <SIZE> Blocksize
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//applet:IF_DF(APPLET_NOEXEC(df, df, BB_DIR_BIN, BB_SUID_DROP, df))
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//kbuild:lib-$(CONFIG_DF) += df.o
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/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
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//usage:#define df_trivial_usage
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//usage: "[-Pk"
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//usage: IF_FEATURE_HUMAN_READABLE("mh")
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//usage: "T"
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//usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
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//usage: "] [FILESYSTEM]..."
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//usage:#define df_full_usage "\n\n"
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//usage: "Print filesystem usage statistics\n"
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//usage: "\n -P POSIX output format"
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//usage: "\n -k 1024-byte blocks (default)"
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//usage: IF_FEATURE_HUMAN_READABLE(
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//usage: "\n -m 1M-byte blocks"
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//usage: "\n -h Human readable (e.g. 1K 243M 2G)"
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//usage: )
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//usage: "\n -T Print filesystem type"
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//usage: IF_FEATURE_DF_FANCY(
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//usage: "\n -a Show all filesystems"
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//usage: "\n -i Inodes"
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//usage: "\n -B SIZE Blocksize"
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//usage: )
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//usage:
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//usage:#define df_example_usage
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//usage: "$ df\n"
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//usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
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//usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
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//usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
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//usage: "$ df /dev/sda3\n"
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//usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
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//usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
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//usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
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//usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
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//usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
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//usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
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//usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
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//usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
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#include <mntent.h>
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#include <sys/statvfs.h>
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#include "libbb.h"
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#include "unicode.h"
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#if !ENABLE_FEATURE_HUMAN_READABLE
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static unsigned long kscale(unsigned long b, unsigned long bs)
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{
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return (b * (unsigned long long) bs + 1024/2) / 1024;
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}
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#endif
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int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int df_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned long df_disp_hr = 1024;
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int status = EXIT_SUCCESS;
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unsigned opt;
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FILE *mount_table;
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struct mntent *mount_entry;
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struct statvfs s;
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enum {
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OPT_KILO = (1 << 0),
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OPT_POSIX = (1 << 1),
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OPT_FSTYPE = (1 << 2),
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OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
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OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
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OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
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OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
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OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
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};
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const char *disp_units_hdr = NULL;
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char *chp;
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init_unicode();
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opt = getopt32(argv, "^"
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"kPT"
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IF_FEATURE_DF_FANCY("aiB:")
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IF_FEATURE_HUMAN_READABLE("hm")
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"\0"
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#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
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"k-mB:m-Bk:B-km"
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#elif ENABLE_FEATURE_HUMAN_READABLE
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"k-m:m-k"
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#endif
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IF_FEATURE_DF_FANCY(, &chp)
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);
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if (opt & OPT_MEGA)
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df_disp_hr = 1024*1024;
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if (opt & OPT_BSIZE) {
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/* GNU coreutils 8.25 accepts "-BMiB" form too */
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int i;
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for (i = 0; kmg_i_suffixes[i].suffix[0]; i++) {
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if (strcmp(kmg_i_suffixes[i].suffix, chp) == 0) {
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df_disp_hr = kmg_i_suffixes[i].mult;
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goto got_it;
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}
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}
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/* Range used to disallow 0 */
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df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
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got_it: ;
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}
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/* From the manpage of df from coreutils-6.10:
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* Disk space is shown in 1K blocks by default, unless the environment
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* variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
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*/
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if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
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df_disp_hr = 512;
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if (opt & OPT_HUMAN) {
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df_disp_hr = 0;
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disp_units_hdr = " Size";
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}
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if (opt & OPT_INODE)
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disp_units_hdr = " Inodes";
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if (disp_units_hdr == NULL) {
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#if ENABLE_FEATURE_HUMAN_READABLE
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disp_units_hdr = xasprintf("%s-blocks",
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/* print df_disp_hr, show no fractionals,
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* use suffixes if OPT_POSIX is set in opt */
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make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
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);
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#else
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disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
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#endif
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}
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printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
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(opt & OPT_FSTYPE) ? "Type " : "",
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disp_units_hdr,
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(opt & OPT_POSIX) ? "Capacity" : "Use%");
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mount_table = NULL;
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argv += optind;
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if (!argv[0]) {
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mount_table = setmntent(bb_path_mtab_file, "r");
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if (!mount_table)
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bb_perror_msg_and_die(bb_path_mtab_file);
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}
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while (1) {
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const char *device;
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const char *mount_point;
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const char *fs_type;
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if (mount_table) {
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mount_entry = getmntent(mount_table);
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if (!mount_entry) {
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endmntent(mount_table);
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break;
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}
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} else {
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mount_point = *argv++;
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if (!mount_point)
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break;
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mount_entry = find_mount_point(mount_point, 1);
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if (!mount_entry) {
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bb_error_msg("%s: can't find mount point", mount_point);
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set_error:
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status = EXIT_FAILURE;
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continue;
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}
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}
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device = mount_entry->mnt_fsname;
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/* GNU coreutils 6.10 skips certain mounts, try to be compatible */
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if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
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continue;
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mount_point = mount_entry->mnt_dir;
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fs_type = mount_entry->mnt_type;
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if (statvfs(mount_point, &s) != 0) {
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bb_simple_perror_msg(mount_point);
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goto set_error;
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}
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/* Some uclibc versions were seen to lose f_frsize
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* (kernel does return it, but then uclibc does not copy it)
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*/
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if (s.f_frsize == 0)
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s.f_frsize = s.f_bsize;
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if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
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unsigned long long blocks_used;
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unsigned long long blocks_total;
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unsigned blocks_percent_used;
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if (opt & OPT_INODE) {
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s.f_blocks = s.f_files;
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s.f_bavail = s.f_bfree = s.f_ffree;
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s.f_frsize = 1;
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if (df_disp_hr)
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df_disp_hr = 1;
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}
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blocks_used = s.f_blocks - s.f_bfree;
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blocks_total = blocks_used + s.f_bavail;
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blocks_percent_used = blocks_total; /* 0% if blocks_total == 0, else... */
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if (blocks_total != 0) {
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/* Downscale sizes for narrower division */
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unsigned u;
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while (blocks_total >= INT_MAX / 101) {
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blocks_total >>= 1;
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blocks_used >>= 1;
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}
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u = (unsigned)blocks_used * 100u + (unsigned)blocks_total / 2;
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blocks_percent_used = u / (unsigned)blocks_total;
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}
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#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
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if (strcmp(device, "/dev/root") == 0) {
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/* Adjusts device to be the real root device,
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* or leaves device alone if it can't find it */
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device = find_block_device("/");
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if (!device) {
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goto set_error;
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}
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}
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#endif
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#if ENABLE_UNICODE_SUPPORT
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{
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uni_stat_t uni_stat;
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char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
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if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
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printf("%s\n%20s", uni_dev, "");
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} else {
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printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
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}
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free(uni_dev);
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if (opt & OPT_FSTYPE) {
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char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
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if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
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printf(" %s\n%31s", uni_type, "");
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else
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printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
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free(uni_type);
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}
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}
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#else
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if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
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printf("\n%-20s", "");
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if (opt & OPT_FSTYPE) {
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if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
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printf("\n%-30s", "");
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}
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#endif
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#if ENABLE_FEATURE_HUMAN_READABLE
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printf(" %9s ",
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/* f_blocks x f_frsize / df_disp_hr, show one fractional,
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* use suffixes if df_disp_hr == 0 */
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make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
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printf(" %9s " + 1,
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/* EXPR x f_frsize / df_disp_hr, show one fractional,
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* use suffixes if df_disp_hr == 0 */
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make_human_readable_str((s.f_blocks - s.f_bfree),
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s.f_frsize, df_disp_hr));
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printf("%9s %3u%% %s\n",
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/* f_bavail x f_frsize / df_disp_hr, show one fractional,
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* use suffixes if df_disp_hr == 0 */
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make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
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blocks_percent_used, mount_point);
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#else
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printf(" %9lu %9lu %9lu %3u%% %s\n",
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kscale(s.f_blocks, s.f_frsize),
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kscale(s.f_blocks - s.f_bfree, s.f_frsize),
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kscale(s.f_bavail, s.f_frsize),
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blocks_percent_used, mount_point);
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#endif
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}
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}
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return status;
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}
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