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- /* df - summarize free disk space
- Copyright (C) 1991 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Usage: df [-aikP] [-t fstype] [--all] [--inodes] [--type fstype]
- [--kilobytes] [--portability] [path...]
-
- Options:
- -a, --all List all filesystems, even zero-size ones.
- -i, --inodes List inode usage information instead of block usage.
- -k, --kilobytes Print sizes in 1K blocks instead of 512-byte blocks.
- -P, --portability Use the POSIX output format (one line per filesystem).
- -t, --type fstype Limit the listing to filesystems of type `fstype'.
- Multiple -t options can be given.
- By default, all filesystem types are listed.
-
- Written by David MacKenzie <djm@gnu.ai.mit.edu> */
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <getopt.h>
- #include "mountlist.h"
- #include "fsusage.h"
- #include "system.h"
-
- char *strstr ();
- char *xmalloc ();
- char *xstrdup ();
- int fs_to_list ();
- void add_fs_type ();
- void error ();
- void print_header ();
- void show_entry ();
- void show_all_entries ();
- void show_dev ();
- void show_disk ();
- void show_point ();
- void usage ();
-
- /* If nonzero, show inode information. */
- int inode_format;
-
- /* If nonzero, show even filesystems with zero size or
- uninteresting types. */
- int show_all_fs;
-
- /* If nonzero, use 1K blocks instead of 512-byte blocks. */
- int kilobyte_blocks;
-
- /* If nonzero, use the POSIX output format. */
- int posix_format;
-
- /* Nonzero if errors have occurred. */
- int exit_status;
-
- /* Name this program was run with. */
- char *program_name;
-
- /* A filesystem type to display. */
-
- struct fs_select
- {
- char *fs_name;
- struct fs_select *fs_next;
- };
-
- /* Linked list of filesystem types to display.
- If `fs_list' is NULL, list all types.
- This table is generated dynamically from command-line options,
- rather than hardcoding into the program what it thinks are the
- valid filesystem types; let the user specify any filesystem type
- they want to, and if there are any filesystems of that type, they
- will be shown.
-
- Some filesystem types:
- 4.2 4.3 ufs nfs swap ignore io vm */
-
- struct fs_select *fs_list;
-
- /* Linked list of mounted filesystems. */
- struct mount_entry *mount_list;
-
- struct option long_options[] =
- {
- {"all", 0, &show_all_fs, 1},
- {"inodes", 0, &inode_format, 1},
- {"kilobytes", 0, &kilobyte_blocks, 1},
- {"portability", 0, &posix_format, 1},
- {"type", 1, 0, 't'},
- {NULL, 0, NULL, 0}
- };
-
- void
- main (argc, argv)
- int argc;
- char **argv;
- {
- int i;
- struct stat *stats;
-
- program_name = argv[0];
- fs_list = NULL;
- inode_format = 0;
- show_all_fs = 0;
- kilobyte_blocks = getenv ("POSIXLY_CORRECT") == 0;
- posix_format = 0;
- exit_status = 0;
-
- while ((i = getopt_long (argc, argv, "aikPt:v", long_options, (int *) 0))
- != EOF)
- {
- switch (i)
- {
- case 0: /* Long option. */
- break;
- case 'a':
- show_all_fs = 1;
- break;
- case 'i':
- inode_format = 1;
- break;
- case 'k':
- kilobyte_blocks = 1;
- break;
- case 'P':
- posix_format = 1;
- break;
- case 't':
- add_fs_type (optarg);
- break;
- case 'v': /* For SysV compatibility. */
- break;
- default:
- usage ();
- }
- }
-
- if (optind != argc)
- {
- /* Display explicitly requested empty filesystems. */
- show_all_fs = 1;
-
- /* stat all the given entries to make sure they get automounted,
- if necessary, before reading the filesystem table. */
- stats = (struct stat *)
- xmalloc ((argc - optind) * sizeof (struct stat));
- for (i = optind; i < argc; ++i)
- if (stat (argv[i], &stats[i - optind]))
- {
- error (0, errno, "%s", argv[i]);
- exit_status = 1;
- argv[i] = NULL;
- }
- }
-
- mount_list = read_filesystem_list (fs_list != NULL, show_all_fs);
- if (mount_list == NULL)
- error (1, errno, "cannot read table of mounted filesystems");
-
- print_header ();
- sync ();
-
- if (optind == argc)
- show_all_entries ();
- else
- for (i = optind; i < argc; ++i)
- if (argv[i])
- show_entry (argv[i], &stats[i - optind]);
-
- exit (exit_status);
- }
-
- void
- print_header ()
- {
- if (inode_format)
- printf ("Filesystem Inodes IUsed IFree %%IUsed");
- else
- printf ("Filesystem %s Used Available Capacity",
- kilobyte_blocks ? "1024-blocks" : " 512-blocks");
- printf (" Mounted on\n");
- }
-
- /* Show all mounted filesystems, except perhaps those that are of
- an unselected type or are empty. */
-
- void
- show_all_entries ()
- {
- struct mount_entry *me;
-
- for (me = mount_list; me; me = me->me_next)
- show_dev (me->me_devname, me->me_mountdir, me->me_type);
- }
-
- /* Determine what kind of node PATH is and show the disk usage
- for it. STATP is the results of `stat' on PATH. */
-
- void
- show_entry (path, statp)
- char *path;
- struct stat *statp;
- {
- if (S_ISBLK (statp->st_mode) || S_ISCHR (statp->st_mode))
- show_disk (path);
- else
- show_point (path, statp);
- }
-
- /* Identify the directory, if any, that device
- DISK is mounted on, and show its disk usage. */
-
- void
- show_disk (disk)
- char *disk;
- {
- struct mount_entry *me;
-
- for (me = mount_list; me; me = me->me_next)
- if (!strcmp (disk, me->me_devname))
- {
- show_dev (me->me_devname, me->me_mountdir, me->me_type);
- return;
- }
- /* No filesystem is mounted on DISK. */
- show_dev (disk, (char *) NULL, (char *) NULL);
- }
-
- /* Figure out which device file or directory POINT is mounted on
- and show its disk usage.
- STATP is the results of `stat' on POINT. */
-
- void
- show_point (point, statp)
- char *point;
- struct stat *statp;
- {
- struct stat disk_stats;
- struct mount_entry *me;
-
- for (me = mount_list; me; me = me->me_next)
- {
- if (me->me_dev == (dev_t) -1)
- {
- if (stat (me->me_mountdir, &disk_stats) == 0)
- me->me_dev = disk_stats.st_dev;
- else
- {
- error (0, errno, "%s", me->me_mountdir);
- exit_status = 1;
- me->me_dev = -2; /* So we won't try and fail repeatedly. */
- }
- }
-
- if (statp->st_dev == me->me_dev)
- {
- show_dev (me->me_devname, me->me_mountdir, me->me_type);
- return;
- }
- }
- error (0, 0, "cannot find mount point for %s", point);
- exit_status = 1;
- }
-
- /* Display a space listing for the disk device with absolute path DISK.
- If MOUNT_POINT is non-NULL, it is the path of the root of the
- filesystem on DISK.
- If FSTYPE is non-NULL, it is the type of the filesystem on DISK. */
-
- void
- show_dev (disk, mount_point, fstype)
- char *disk;
- char *mount_point;
- char *fstype;
- {
- struct fs_usage fsu;
- long blocks_used;
- long blocks_percent_used;
- long inodes_used;
- long inodes_percent_used;
- char *stat_file;
-
- if (!fs_to_list (fstype))
- return;
-
- /* If MOUNT_POINT is NULL, then the filesystem is not mounted, and this
- program reports on the filesystem that the special file is on.
- It would be better to report on the unmounted filesystem,
- but statfs doesn't do that on most systems. */
- stat_file = mount_point ? mount_point : disk;
-
- if (get_fs_usage (stat_file, disk, &fsu))
- {
- error (0, errno, "%s", stat_file);
- exit_status = 1;
- return;
- }
-
- if (kilobyte_blocks)
- {
- fsu.fsu_blocks /= 2;
- fsu.fsu_bfree /= 2;
- fsu.fsu_bavail /= 2;
- }
-
- if (fsu.fsu_blocks == 0)
- {
- if (show_all_fs == 0)
- return;
- blocks_used = fsu.fsu_bavail = blocks_percent_used = 0;
- }
- else
- {
- blocks_used = fsu.fsu_blocks - fsu.fsu_bfree;
- blocks_percent_used = (long)
- (blocks_used * 100.0 / (blocks_used + fsu.fsu_bavail) + 0.5);
- }
-
- if (fsu.fsu_files == 0)
- {
- inodes_used = fsu.fsu_ffree = inodes_percent_used = 0;
- }
- else
- {
- inodes_used = fsu.fsu_files - fsu.fsu_ffree;
- inodes_percent_used = (long)
- (inodes_used * 100.0 / fsu.fsu_files + 0.5);
- }
-
- printf ("%-20s", disk);
- if (strlen (disk) > 20 && !posix_format)
- printf ("\n ");
-
- if (inode_format)
- printf (" %7ld %7ld %7ld %5ld%%",
- fsu.fsu_files, inodes_used, fsu.fsu_ffree, inodes_percent_used);
- else
- printf (" %7ld %7ld %7ld %5ld%% ",
- fsu.fsu_blocks, blocks_used, fsu.fsu_bavail, blocks_percent_used);
-
- if (mount_point)
- printf (" %s", mount_point);
- putchar ('\n');
- }
-
- /* Add FSTYPE to the list of filesystem types to display. */
-
- void
- add_fs_type (fstype)
- char *fstype;
- {
- struct fs_select *fsp;
-
- fsp = (struct fs_select *) xmalloc (sizeof (struct fs_select));
- fsp->fs_name = fstype;
- fsp->fs_next = fs_list;
- fs_list = fsp;
- }
-
- /* If FSTYPE is a type of filesystem that should be listed,
- return nonzero, else zero. */
-
- int
- fs_to_list (fstype)
- char *fstype;
- {
- struct fs_select *fsp;
-
- if (fs_list == NULL || fstype == NULL)
- return 1;
- for (fsp = fs_list; fsp; fsp = fsp->fs_next)
- if (!strcmp (fstype, fsp->fs_name))
- return 1;
- return 0;
- }
-
- void
- usage ()
- {
- fprintf (stderr, "\
- Usage: %s [-aikPv] [-t fstype] [--all] [--inodes] [--type fstype]\n\
- [--kilobytes] [--portability] [path...]\n",
- program_name);
- exit (1);
- }
-