1 /* df.c - report free disk space. 2 * 3 * Copyright 2006 Rob Landley <rob (at) landley.net> 4 * 5 * See http://opengroup.org/onlinepubs/9699919799/utilities/df.html 6 7 USE_DF(NEWTOY(df, "HPkht*a[-HPkh]", TOYFLAG_SBIN)) 8 9 config DF 10 bool "df" 11 default y 12 help 13 usage: df [-HPkh] [-t type] [FILESYSTEM ...] 14 15 The "disk free" command shows total/used/available disk space for 16 each filesystem listed on the command line, or all currently mounted 17 filesystems. 18 19 -P The SUSv3 "Pedantic" option 20 -k Sets units back to 1024 bytes (the default without -P) 21 -h Human readable output (K=1024) 22 -H Human readable output (k=1000) 23 -t type Display only filesystems of this type. 24 25 Pedantic provides a slightly less useful output format dictated by Posix, 26 and sets the units to 512 bytes instead of the default 1024 bytes. 27 */ 28 29 #define FOR_df 30 #include "toys.h" 31 32 GLOBALS( 33 struct arg_list *fstype; 34 35 long units; 36 int column_widths[5]; 37 int header_shown; 38 ) 39 40 static void measure_column(int col, const char *s) 41 { 42 size_t len = strlen(s); 43 44 if (TT.column_widths[col] < len) TT.column_widths[col] = len; 45 } 46 47 static void measure_numeric_column(int col, long long n) 48 { 49 snprintf(toybuf, sizeof(toybuf), "%lld", n); 50 return measure_column(col, toybuf); 51 } 52 53 static void show_header() 54 { 55 TT.header_shown = 1; 56 57 // The filesystem column is always at least this wide. 58 if (TT.column_widths[0] < 14) TT.column_widths[0] = 14; 59 60 if (toys.optflags & (FLAG_H|FLAG_h)) { 61 xprintf("%-*s Size Used Avail Use%% Mounted on\n", 62 TT.column_widths[0], "Filesystem"); 63 } else { 64 const char *blocks_label = TT.units == 512 ? "512-blocks" : "1K-blocks"; 65 const char *use_label = toys.optflags & FLAG_P ? "Capacity" : "Use%"; 66 67 measure_column(1, blocks_label); 68 measure_column(2, "Used"); 69 measure_column(3, "Available"); 70 measure_column(4, use_label); 71 xprintf("%-*s %*s %*s %*s %*s Mounted on\n", 72 TT.column_widths[0], "Filesystem", 73 TT.column_widths[1], blocks_label, 74 TT.column_widths[2], "Used", 75 TT.column_widths[3], "Available", 76 TT.column_widths[4], use_label); 77 78 // For the "Use%" column, the trailing % should be inside the column. 79 TT.column_widths[4]--; 80 } 81 } 82 83 static void show_mt(struct mtab_list *mt, int measuring) 84 { 85 long long size, used, avail, percent, block; 86 char *device; 87 88 // Return if it wasn't found (should never happen, but with /etc/mtab...) 89 if (!mt) return; 90 91 // If we have -t, skip other filesystem types 92 if (TT.fstype) { 93 struct arg_list *al; 94 95 for (al = TT.fstype; al; al = al->next) 96 if (!strcmp(mt->type, al->arg)) break; 97 98 if (!al) return; 99 } 100 101 // If we don't have -a, skip synthetic filesystems 102 if (!(toys.optflags & FLAG_a) && !mt->statvfs.f_blocks) return; 103 104 // Figure out how much total/used/free space this filesystem has, 105 // forcing 64-bit math because filesystems are big now. 106 block = mt->statvfs.f_bsize ? mt->statvfs.f_bsize : 1; 107 size = (block * mt->statvfs.f_blocks) / TT.units; 108 used = (block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree)) / TT.units; 109 avail = (block*(getuid()?mt->statvfs.f_bavail:mt->statvfs.f_bfree))/TT.units; 110 if (!(used+avail)) percent = 0; 111 else { 112 percent = (used*100)/(used+avail); 113 if (used*100 != percent*(used+avail)) percent++; 114 } 115 116 device = *mt->device == '/' ? realpath(mt->device, NULL) : NULL; 117 if (!device) device = mt->device; 118 119 if (measuring) { 120 measure_column(0, device); 121 measure_numeric_column(1, size); 122 measure_numeric_column(2, used); 123 measure_numeric_column(3, avail); 124 } else { 125 if (!TT.header_shown) show_header(); 126 127 if (toys.optflags & (FLAG_H|FLAG_h)) { 128 char *size_str = toybuf, *used_str = toybuf+64, *avail_str = toybuf+128; 129 int hr_flags = (toys.optflags & FLAG_H) ? HR_1000 : 0; 130 131 human_readable(size_str, size, hr_flags); 132 human_readable(used_str, used, hr_flags); 133 human_readable(avail_str, avail, hr_flags); 134 xprintf("%-*s %4s %4s %4s % 3lld%% %s\n", 135 TT.column_widths[0], device, 136 size_str, used_str, avail_str, percent, mt->dir); 137 } else xprintf("%-*s %*lld %*lld %*lld %*lld%% %s\n", 138 TT.column_widths[0], device, 139 TT.column_widths[1], size, 140 TT.column_widths[2], used, 141 TT.column_widths[3], avail, 142 TT.column_widths[4], percent, 143 mt->dir); 144 } 145 146 if (device != mt->device) free(device); 147 } 148 149 void df_main(void) 150 { 151 struct mtab_list *mt, *mtstart, *mtend; 152 int measuring; 153 154 if (toys.optflags & (FLAG_H|FLAG_h)) { 155 TT.units = 1; 156 } else { 157 // Units are 512 bytes if you select "pedantic" without "kilobytes". 158 TT.units = toys.optflags & FLAG_P ? 512 : 1024; 159 } 160 161 if (!(mtstart = xgetmountlist(0))) return; 162 mtend = dlist_terminate(mtstart); 163 164 // If we have a list of filesystems on the command line, loop through them. 165 if (*toys.optargs) { 166 // Measure the names then output the table. 167 for (measuring = 1; measuring >= 0; --measuring) { 168 char **next; 169 170 for (next = toys.optargs; *next; next++) { 171 struct stat st; 172 173 // Stat it (complain if we can't). 174 if (stat(*next, &st)) { 175 perror_msg("'%s'", *next); 176 continue; 177 } 178 179 // Find and display this filesystem. Use _last_ hit in case of 180 // overmounts (which is first hit in the reversed list). 181 for (mt = mtend; mt; mt = mt->prev) { 182 if (st.st_dev == mt->stat.st_dev 183 || (st.st_rdev && (st.st_rdev == mt->stat.st_dev))) 184 { 185 show_mt(mt, measuring); 186 break; 187 } 188 } 189 } 190 } 191 } else { 192 // Loop through mount list to filter out overmounts. 193 for (mt = mtend; mt; mt = mt->prev) { 194 struct mtab_list *mt2, *mt3; 195 196 // 0:0 is LANANA null device 197 if (!mt->stat.st_dev) continue; 198 199 // Filter out overmounts. 200 mt3 = mt; 201 for (mt2 = mt->prev; mt2; mt2 = mt2->prev) { 202 if (mt->stat.st_dev == mt2->stat.st_dev) { 203 // For --bind mounts, show earliest mount 204 if (!strcmp(mt->device, mt2->device)) { 205 if (!toys.optflags & FLAG_a) mt3->stat.st_dev = 0; 206 mt3 = mt2; 207 } else mt2->stat.st_dev = 0; 208 } 209 } 210 } 211 212 // Measure the names then output the table. 213 for (measuring = 1; measuring >= 0; --measuring) { 214 // Cosmetic: show filesystems in creation order. 215 for (mt = mtstart; mt; mt = mt->next) { 216 if (mt->stat.st_dev) show_mt(mt, measuring); 217 } 218 } 219 } 220 221 if (CFG_TOYBOX_FREE) llist_traverse(mtstart, free); 222 } 223
