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 tarball for details. 9 */ 10 11/* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */ 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 21#include <mntent.h> 22#include <sys/vfs.h> 23#include "libbb.h" 24 25#if !ENABLE_FEATURE_HUMAN_READABLE 26static unsigned long kscale(unsigned long b, unsigned long bs) 27{ 28 return (b * (unsigned long long) bs + 1024/2) / 1024; 29} 30#endif 31 32int df_main(int argc, char **argv); 33int df_main(int argc, char **argv) 34{ 35 unsigned long blocks_used; 36 unsigned blocks_percent_used; 37#if ENABLE_FEATURE_HUMAN_READABLE 38 unsigned df_disp_hr = 1024; 39#endif 40 int status = EXIT_SUCCESS; 41 unsigned opt; 42 FILE *mount_table; 43 struct mntent *mount_entry; 44 struct statfs s; 45 /* default display is kilobytes */ 46 const char *disp_units_hdr = "1k-blocks"; 47 48#if ENABLE_FEATURE_HUMAN_READABLE 49 opt_complementary = "h-km:k-hm:m-hk"; 50 opt = getopt32(argv, "hmk"); 51 if (opt & 1) { 52 df_disp_hr = 0; 53 disp_units_hdr = " Size"; 54 } 55 if (opt & 2) { 56 df_disp_hr = 1024*1024; 57 disp_units_hdr = "1M-blocks"; 58 } 59#else 60 opt = getopt32(argv, "k"); 61#endif 62 63 printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n", 64 "", disp_units_hdr); 65 66 mount_table = NULL; 67 argv += optind; 68 if (optind >= argc) { 69 mount_table = setmntent(bb_path_mtab_file, "r"); 70 if (!mount_table) { 71 bb_perror_msg_and_die(bb_path_mtab_file); 72 } 73 } 74 75 while (1) { 76 const char *device; 77 const char *mount_point; 78 79 if (mount_table) { 80 mount_entry = getmntent(mount_table); 81 if (!mount_entry) { 82 endmntent(mount_table); 83 break; 84 } 85 } else { 86 mount_point = *argv++; 87 if (!mount_point) { 88 break; 89 } 90 mount_entry = find_mount_point(mount_point, bb_path_mtab_file); 91 if (!mount_entry) { 92 bb_error_msg("%s: can't find mount point", mount_point); 93 SET_ERROR: 94 status = EXIT_FAILURE; 95 continue; 96 } 97 } 98 99 device = mount_entry->mnt_fsname; 100 mount_point = mount_entry->mnt_dir; 101 102 if (statfs(mount_point, &s) != 0) { 103 bb_perror_msg("%s", mount_point); 104 goto SET_ERROR; 105 } 106 107 if ((s.f_blocks > 0) || !mount_table){ 108 blocks_used = s.f_blocks - s.f_bfree; 109 blocks_percent_used = 0; 110 if (blocks_used + s.f_bavail) { 111 blocks_percent_used = (blocks_used * 100ULL 112 + (blocks_used + s.f_bavail)/2 113 ) / (blocks_used + s.f_bavail); 114 } 115 116 if (strcmp(device, "rootfs") == 0) { 117 continue; 118 } else if (strcmp(device, "/dev/root") == 0) { 119 /* Adjusts device to be the real root device, 120 * or leaves device alone if it can't find it */ 121 device = find_block_device("/"); 122 if (!device) { 123 goto SET_ERROR; 124 } 125 } 126 127 if (printf("\n%-20s" + 1, device) > 20) 128 printf("\n%-20s", ""); 129#if ENABLE_FEATURE_HUMAN_READABLE 130 printf(" %9s ", 131 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr)); 132 133 printf(" %9s " + 1, 134 make_human_readable_str((s.f_blocks - s.f_bfree), 135 s.f_bsize, df_disp_hr)); 136 137 printf("%9s %3u%% %s\n", 138 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr), 139 blocks_percent_used, mount_point); 140#else 141 printf(" %9lu %9lu %9lu %3u%% %s\n", 142 kscale(s.f_blocks, s.f_bsize), 143 kscale(s.f_blocks-s.f_bfree, s.f_bsize), 144 kscale(s.f_bavail, s.f_bsize), 145 blocks_percent_used, mount_point); 146#endif 147 } 148 } 149 150 fflush_stdout_and_exit(status); 151} 152