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/* df.c - report free disk space.
*
* Copyright 2006 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/df.html
USE_DF(NEWTOY(df, "HPkhit*a[-HPkh]", TOYFLAG_SBIN))
config DF
bool "df"
default y
help
usage: df [-HPkhi] [-t type] [FILESYSTEM ...]
The "disk free" command shows total/used/available disk space for
each filesystem listed on the command line, or all currently mounted
filesystems.
-a Show all (including /proc and friends)
-P The SUSv3 "Pedantic" option
-k Sets units back to 1024 bytes (the default without -P)
-h Human readable (K=1024)
-H Human readable (k=1000)
-i Show inodes instead of blocks
-t type Display only filesystems of this type
Pedantic provides a slightly less useful output format dictated by Posix,
and sets the units to 512 bytes instead of the default 1024 bytes.
*/
#define FOR_df
#include "toys.h"
GLOBALS(
struct arg_list *t;
long units;
int column_widths[5];
int header_shown;
)
static void measure_column(int col, const char *s)
{
size_t len = strlen(s);
if (TT.column_widths[col] < len) TT.column_widths[col] = len;
}
static void measure_numeric_column(int col, long long n)
{
snprintf(toybuf, sizeof(toybuf), "%llu", n);
return measure_column(col, toybuf);
}
static void show_header()
{
TT.header_shown = 1;
// The filesystem column is always at least this wide.
if (TT.column_widths[0] < 14) TT.column_widths[0] = 14;
if ((toys.optflags & (FLAG_H|FLAG_h))) {
xprintf((toys.optflags&FLAG_i) ?
"%-*sInodes IUsed IFree IUse%% Mounted on\n" :
"%-*s Size Used Avail Use%% Mounted on\n",
TT.column_widths[0], "Filesystem");
} else {
const char *item_label, *used_label, *free_label, *use_label;
if (toys.optflags & FLAG_i) {
item_label = "Inodes";
used_label = "IUsed";
free_label = "IFree";
use_label = "IUse%";
} else {
item_label = TT.units == 512 ? "512-blocks" : "1K-blocks";
used_label = "Used";
free_label = "Available";
use_label = toys.optflags & FLAG_P ? "Capacity" : "Use%";
}
measure_column(1, item_label);
measure_column(2, used_label);
measure_column(3, free_label);
measure_column(4, use_label);
xprintf("%-*s %*s %*s %*s %*s Mounted on\n",
TT.column_widths[0], "Filesystem",
TT.column_widths[1], item_label,
TT.column_widths[2], used_label,
TT.column_widths[3], free_label,
TT.column_widths[4], use_label);
// For the "Use%" column, the trailing % should be inside the column.
TT.column_widths[4]--;
}
}
static void show_mt(struct mtab_list *mt, int measuring)
{
unsigned long long size, used, avail, percent, block;
char *device;
// Return if it wasn't found (should never happen, but with /etc/mtab...)
if (!mt) return;
// If we have -t, skip other filesystem types
if (TT.t) {
struct arg_list *al;
for (al = TT.t; al; al = al->next)
if (!strcmp(mt->type, al->arg)) break;
if (!al) return;
}
// If we don't have -a, skip synthetic filesystems
if (!(toys.optflags & FLAG_a) && !mt->statvfs.f_blocks) return;
// Figure out how much total/used/free space this filesystem has,
// forcing 64-bit math because filesystems are big now.
if (toys.optflags & FLAG_i) {
size = mt->statvfs.f_files;
used = mt->statvfs.f_files - mt->statvfs.f_ffree;
avail = getuid() ? mt->statvfs.f_favail : mt->statvfs.f_ffree;
} else {
block = mt->statvfs.f_bsize ? mt->statvfs.f_bsize : 1;
size = (block * mt->statvfs.f_blocks) / TT.units;
used = (block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree)) / TT.units;
avail= (block*(getuid()?mt->statvfs.f_bavail:mt->statvfs.f_bfree))/TT.units;
}
if (!(used+avail)) percent = 0;
else {
percent = (used*100)/(used+avail);
if (used*100 != percent*(used+avail)) percent++;
}
device = *mt->device == '/' ? realpath(mt->device, NULL) : NULL;
if (!device) device = mt->device;
if (measuring) {
measure_column(0, device);
measure_numeric_column(1, size);
measure_numeric_column(2, used);
measure_numeric_column(3, avail);
} else {
if (!TT.header_shown) show_header();
if (toys.optflags & (FLAG_H|FLAG_h)) {
char *size_str = toybuf, *used_str = toybuf+64, *avail_str = toybuf+128;
int hr_flags = (toys.optflags & FLAG_H) ? HR_1000 : 0;
int w = 4 + !!(toys.optflags & FLAG_i);
human_readable(size_str, size, hr_flags);
human_readable(used_str, used, hr_flags);
human_readable(avail_str, avail, hr_flags);
xprintf("%-*s %*s %*s %*s %*llu%% %s\n",
TT.column_widths[0], device,
w, size_str, w, used_str, w, avail_str, w-1, percent, mt->dir);
} else xprintf("%-*s %*llu %*llu %*llu %*llu%% %s\n",
TT.column_widths[0], device,
TT.column_widths[1], size,
TT.column_widths[2], used,
TT.column_widths[3], avail,
TT.column_widths[4], percent,
mt->dir);
}
if (device != mt->device) free(device);
}
void df_main(void)
{
struct mtab_list *mt, *mtstart, *mtend;
int measuring;
if (toys.optflags & (FLAG_H|FLAG_h)) {
TT.units = 1;
} else {
// Units are 512 bytes if you select "pedantic" without "kilobytes".
TT.units = toys.optflags & FLAG_P ? 512 : 1024;
}
if (!(mtstart = xgetmountlist(0))) return;
mtend = dlist_terminate(mtstart);
// If we have a list of filesystems on the command line, loop through them.
if (*toys.optargs) {
// Measure the names then output the table.
for (measuring = 1; measuring >= 0; --measuring) {
char **next;
for (next = toys.optargs; *next; next++) {
struct stat st;
// Stat it (complain if we can't).
if (stat(*next, &st)) {
perror_msg("'%s'", *next);
continue;
}
// Find and display this filesystem. Use _last_ hit in case of
// overmounts (which is first hit in the reversed list).
for (mt = mtend; mt; mt = mt->prev) {
if (st.st_dev == mt->stat.st_dev
|| (st.st_rdev && (st.st_rdev == mt->stat.st_dev)))
{
show_mt(mt, measuring);
break;
}
}
}
}
} else {
// Loop through mount list to filter out overmounts.
for (mt = mtend; mt; mt = mt->prev) {
struct mtab_list *mt2, *mt3;
// 0:0 is LANANA null device
if (!mt->stat.st_dev) continue;
// Filter out overmounts.
mt3 = mt;
for (mt2 = mt->prev; mt2; mt2 = mt2->prev) {
if (mt->stat.st_dev == mt2->stat.st_dev) {
// For --bind mounts, show earliest mount
if (!strcmp(mt->device, mt2->device)) {
if (!(toys.optflags & FLAG_a)) mt3->stat.st_dev = 0;
mt3 = mt2;
} else mt2->stat.st_dev = 0;
}
}
}
// Measure the names then output the table.
for (measuring = 1; measuring >= 0; --measuring) {
// Cosmetic: show filesystems in creation order.
for (mt = mtstart; mt; mt = mt->next) {
if (mt->stat.st_dev) show_mt(mt, measuring);
}
}
}
if (CFG_TOYBOX_FREE) llist_traverse(mtstart, free);
}
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