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