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1#
2# For a description of the syntax of this configuration file,
3# see scripts/kbuild/config-language.txt.
4#
5
6menu "Linux System Utilities"
7
8config ACPID
9 bool "acpid"
10 default y
11 help
12 acpid listens to ACPI events coming either in textual form from
13 /proc/acpi/event (though it is marked deprecated it is still widely
14 used and _is_ a standard) or in binary form from specified evdevs
15 (just use /dev/input/event*).
16
17 It parses the event to retrieve ACTION and a possible PARAMETER.
18 It then spawns /etc/acpi/<ACTION>[/<PARAMETER>] either via run-parts
19 (if the resulting path is a directory) or directly as an executable.
20
21 N.B. acpid relies on run-parts so have the latter installed.
22
23config FEATURE_ACPID_COMPAT
24 bool "Accept and ignore redundant options"
25 default y
26 depends on ACPID
27 help
28 Accept and ignore compatibility options -g -m -s -S -v.
29
30config BLKID
31 bool "blkid"
32 default y
33 select VOLUMEID
34 help
35 Lists labels and UUIDs of all filesystems.
36 WARNING:
37 With all submodules selected, it will add ~8k to busybox.
38
39config DMESG
40 bool "dmesg"
41 default y
42 help
43 dmesg is used to examine or control the kernel ring buffer. When the
44 Linux kernel prints messages to the system log, they are stored in
45 the kernel ring buffer. You can use dmesg to print the kernel's ring
46 buffer, clear the kernel ring buffer, change the size of the kernel
47 ring buffer, and change the priority level at which kernel messages
48 are also logged to the system console. Enable this option if you
49 wish to enable the 'dmesg' utility.
50
51config FEATURE_DMESG_PRETTY
52 bool "Pretty dmesg output"
53 default y
54 depends on DMESG
55 help
56 If you wish to scrub the syslog level from the output, say 'Y' here.
57 The syslog level is a string prefixed to every line with the form
58 "<#>".
59
60 With this option you will see:
61 # dmesg
62 Linux version 2.6.17.4 .....
63 BIOS-provided physical RAM map:
64 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
65
66 Without this option you will see:
67 # dmesg
68 <5>Linux version 2.6.17.4 .....
69 <6>BIOS-provided physical RAM map:
70 <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
71
72config FBSET
73 bool "fbset"
74 default y
75 help
76 fbset is used to show or change the settings of a Linux frame buffer
77 device. The frame buffer device provides a simple and unique
78 interface to access a graphics display. Enable this option
79 if you wish to enable the 'fbset' utility.
80
81config FEATURE_FBSET_FANCY
82 bool "Turn on extra fbset options"
83 default y
84 depends on FBSET
85 help
86 This option enables extended fbset options, allowing one to set the
87 framebuffer size, color depth, etc. interface to access a graphics
88 display. Enable this option if you wish to enable extended fbset
89 options.
90
91config FEATURE_FBSET_READMODE
92 bool "Turn on fbset readmode support"
93 default y
94 depends on FBSET
95 help
96 This option allows fbset to read the video mode database stored by
97 default as /etc/fb.modes, which can be used to set frame buffer
98 device to pre-defined video modes.
99
100config FDFLUSH
101 bool "fdflush"
102 default y
103 help
104 fdflush is only needed when changing media on slightly-broken
105 removable media drives. It is used to make Linux believe that a
106 hardware disk-change switch has been actuated, which causes Linux to
107 forget anything it has cached from the previous media. If you have
108 such a slightly-broken drive, you will need to run fdflush every time
109 you change a disk. Most people have working hardware and can safely
110 leave this disabled.
111
112config FDFORMAT
113 bool "fdformat"
114 default y
115 help
116 fdformat is used to low-level format a floppy disk.
117
118config FDISK
119 bool "fdisk"
120 default y
121 help
122 The fdisk utility is used to divide hard disks into one or more
123 logical disks, which are generally called partitions. This utility
124 can be used to list and edit the set of partitions or BSD style
125 'disk slices' that are defined on a hard drive.
126
127config FDISK_SUPPORT_LARGE_DISKS
128 bool "Support over 4GB disks"
129 default y
130 depends on FDISK
131 help
132 Enable this option to support large disks > 4GB.
133
134config FEATURE_FDISK_WRITABLE
135 bool "Write support"
136 default y
137 depends on FDISK
138 help
139 Enabling this option allows you to create or change a partition table
140 and write those changes out to disk. If you leave this option
141 disabled, you will only be able to view the partition table.
142
143config FEATURE_AIX_LABEL
144 bool "Support AIX disklabels"
145 default n
146 depends on FDISK && FEATURE_FDISK_WRITABLE
147 help
148 Enabling this option allows you to create or change AIX disklabels.
149 Most people can safely leave this option disabled.
150
151config FEATURE_SGI_LABEL
152 bool "Support SGI disklabels"
153 default n
154 depends on FDISK && FEATURE_FDISK_WRITABLE
155 help
156 Enabling this option allows you to create or change SGI disklabels.
157 Most people can safely leave this option disabled.
158
159config FEATURE_SUN_LABEL
160 bool "Support SUN disklabels"
161 default n
162 depends on FDISK && FEATURE_FDISK_WRITABLE
163 help
164 Enabling this option allows you to create or change SUN disklabels.
165 Most people can safely leave this option disabled.
166
167config FEATURE_OSF_LABEL
168 bool "Support BSD disklabels"
169 default n
170 depends on FDISK && FEATURE_FDISK_WRITABLE
171 help
172 Enabling this option allows you to create or change BSD disklabels
173 and define and edit BSD disk slices.
174
175config FEATURE_FDISK_ADVANCED
176 bool "Support expert mode"
177 default y
178 depends on FDISK && FEATURE_FDISK_WRITABLE
179 help
180 Enabling this option allows you to do terribly unsafe things like
181 define arbitrary drive geometry, move the beginning of data in a
182 partition, and similarly evil things. Unless you have a very good
183 reason you would be wise to leave this disabled.
184
185config FINDFS
186 bool "findfs"
187 default y
188 select VOLUMEID
189 help
190 Prints the name of a filesystem with given label or UUID.
191 WARNING:
192 With all submodules selected, it will add ~8k to busybox.
193
194config FLOCK
195 bool "flock"
196 default y
197 help
198 Manage locks from shell scripts
199
200config FREERAMDISK
201 bool "freeramdisk"
202 default y
203 help
204 Linux allows you to create ramdisks. This utility allows you to
205 delete them and completely free all memory that was used for the
206 ramdisk. For example, if you boot Linux into a ramdisk and later
207 pivot_root, you may want to free the memory that is allocated to the
208 ramdisk. If you have no use for freeing memory from a ramdisk, leave
209 this disabled.
210
211config FSCK_MINIX
212 bool "fsck_minix"
213 default y
214 help
215 The minix filesystem is a nice, small, compact, read-write filesystem
216 with little overhead. It is not a journaling filesystem however and
217 can experience corruption if it is not properly unmounted or if the
218 power goes off in the middle of a write. This utility allows you to
219 check for and attempt to repair any corruption that occurs to a minix
220 filesystem.
221
222config MKFS_EXT2
223 bool "mkfs_ext2"
224 default y
225 help
226 Utility to create EXT2 filesystems.
227
228config MKFS_MINIX
229 bool "mkfs_minix"
230 default y
231 help
232 The minix filesystem is a nice, small, compact, read-write filesystem
233 with little overhead. If you wish to be able to create minix
234 filesystems this utility will do the job for you.
235
236config FEATURE_MINIX2
237 bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
238 default y
239 depends on FSCK_MINIX || MKFS_MINIX
240 help
241 If you wish to be able to create version 2 minix filesystems, enable
242 this. If you enabled 'mkfs_minix' then you almost certainly want to
243 be using the version 2 filesystem support.
244
245config MKFS_REISER
246 bool "mkfs_reiser"
247 default n
248 help
249 Utility to create ReiserFS filesystems.
250 Note: this applet needs a lot of testing and polishing.
251
252config MKFS_VFAT
253 bool "mkfs_vfat"
254 default y
255 help
256 Utility to create FAT32 filesystems.
257
258config GETOPT
259 bool "getopt"
260 default y
261 help
262 The getopt utility is used to break up (parse) options in command
263 lines to make it easy to write complex shell scripts that also check
264 for legal (and illegal) options. If you want to write horribly
265 complex shell scripts, or use some horribly complex shell script
266 written by others, this utility may be for you. Most people will
267 wisely leave this disabled.
268
269config FEATURE_GETOPT_LONG
270 bool "Support option -l"
271 default y if LONG_OPTS
272 depends on GETOPT
273 help
274 Enable support for long options (option -l).
275
276config HEXDUMP
277 bool "hexdump"
278 default y
279 help
280 The hexdump utility is used to display binary data in a readable
281 way that is comparable to the output from most hex editors.
282
283config FEATURE_HEXDUMP_REVERSE
284 bool "Support -R, reverse of 'hexdump -Cv'"
285 default y
286 depends on HEXDUMP
287 help
288 The hexdump utility is used to display binary data in an ascii
289 readable way. This option creates binary data from an ascii input.
290 NB: this option is non-standard. It's unwise to use it in scripts
291 aimed to be portable.
292
293config HD
294 bool "hd"
295 default y
296 depends on HEXDUMP
297 help
298 hd is an alias to hexdump -C.
299
300config HWCLOCK
301 bool "hwclock"
302 default y
303 help
304 The hwclock utility is used to read and set the hardware clock
305 on a system. This is primarily used to set the current time on
306 shutdown in the hardware clock, so the hardware will keep the
307 correct time when Linux is _not_ running.
308
309config FEATURE_HWCLOCK_LONG_OPTIONS
310 bool "Support long options (--hctosys,...)"
311 default y
312 depends on HWCLOCK && LONG_OPTS
313 help
314 By default, the hwclock utility only uses short options. If you
315 are overly fond of its long options, such as --hctosys, --utc, etc)
316 then enable this option.
317
318config FEATURE_HWCLOCK_ADJTIME_FHS
319 bool "Use FHS /var/lib/hwclock/adjtime"
320 default y
321 depends on HWCLOCK
322 help
323 Starting with FHS 2.3, the adjtime state file is supposed to exist
324 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
325 to use the FHS behavior, answer Y here, otherwise answer N for the
326 classic /etc/adjtime path.
327
328 pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
329
330config IPCRM
331 bool "ipcrm"
332 default y
333 select FEATURE_SUID
334 help
335 The ipcrm utility allows the removal of System V interprocess
336 communication (IPC) objects and the associated data structures
337 from the system.
338
339config IPCS
340 bool "ipcs"
341 default y
342 select FEATURE_SUID
343 help
344 The ipcs utility is used to provide information on the currently
345 allocated System V interprocess (IPC) objects in the system.
346
347config LOSETUP
348 bool "losetup"
349 default y
350 help
351 losetup is used to associate or detach a loop device with a regular
352 file or block device, and to query the status of a loop device. This
353 version does not currently support enabling data encryption.
354
355config LSPCI
356 bool "lspci"
357 default y
358 help
359 lspci is a utility for displaying information about PCI buses in the
360 system and devices connected to them.
361
362 This version uses sysfs (/sys/bus/pci/devices) only.
363
364config LSUSB
365 bool "lsusb"
366 default y
367 help
368 lsusb is a utility for displaying information about USB buses in the
369 system and devices connected to them.
370
371 This version uses sysfs (/sys/bus/usb/devices) only.
372
373config MDEV
374 bool "mdev"
375 default y
376 help
377 mdev is a mini-udev implementation for dynamically creating device
378 nodes in the /dev directory.
379
380 For more information, please see docs/mdev.txt
381
382config FEATURE_MDEV_CONF
383 bool "Support /etc/mdev.conf"
384 default y
385 depends on MDEV
386 help
387 Add support for the mdev config file to control ownership and
388 permissions of the device nodes.
389
390 For more information, please see docs/mdev.txt
391
392config FEATURE_MDEV_RENAME
393 bool "Support subdirs/symlinks"
394 default y
395 depends on FEATURE_MDEV_CONF
396 help
397 Add support for renaming devices and creating symlinks.
398
399 For more information, please see docs/mdev.txt
400
401config FEATURE_MDEV_RENAME_REGEXP
402 bool "Support regular expressions substitutions when renaming device"
403 default y
404 depends on FEATURE_MDEV_RENAME
405 help
406 Add support for regular expressions substitutions when renaming
407 device.
408
409config FEATURE_MDEV_EXEC
410 bool "Support command execution at device addition/removal"
411 default y
412 depends on FEATURE_MDEV_CONF
413 help
414 This adds support for an optional field to /etc/mdev.conf for
415 executing commands when devices are created/removed.
416
417 For more information, please see docs/mdev.txt
418
419config FEATURE_MDEV_LOAD_FIRMWARE
420 bool "Support loading of firmwares"
421 default y
422 depends on MDEV
423 help
424 Some devices need to load firmware before they can be usable.
425
426 These devices will request userspace look up the files in
427 /lib/firmware/ and if it exists, send it to the kernel for
428 loading into the hardware.
429
430config MKSWAP
431 bool "mkswap"
432 default y
433 help
434 The mkswap utility is used to configure a file or disk partition as
435 Linux swap space. This allows Linux to use the entire file or
436 partition as if it were additional RAM, which can greatly increase
437 the capability of low-memory machines. This additional memory is
438 much slower than real RAM, but can be very helpful at preventing your
439 applications being killed by the Linux out of memory (OOM) killer.
440 Once you have created swap space using 'mkswap' you need to enable
441 the swap space using the 'swapon' utility.
442
443config FEATURE_MKSWAP_UUID
444 bool "UUID support"
445 default y
446 depends on MKSWAP
447 help
448 Generate swap spaces with universally unique identifiers.
449
450config MORE
451 bool "more"
452 default y
453 help
454 more is a simple utility which allows you to read text one screen
455 sized page at a time. If you want to read text that is larger than
456 the screen, and you are using anything faster than a 300 baud modem,
457 you will probably find this utility very helpful. If you don't have
458 any need to reading text files, you can leave this disabled.
459
460config FEATURE_USE_TERMIOS
461 bool "Use termios to manipulate the screen"
462 default y
463 depends on MORE || TOP
464 help
465 This option allows utilities such as 'more' and 'top' to determine
466 the size of the screen. If you leave this disabled, your utilities
467 that display things on the screen will be especially primitive and
468 will be unable to determine the current screen size, and will be
469 unable to move the cursor.
470
471config VOLUMEID
472 bool #No description makes it a hidden option
473 default y
474
475config FEATURE_VOLUMEID_EXT
476 bool "Ext filesystem"
477 default y
478 depends on VOLUMEID
479 help
480 TODO
481
482config FEATURE_VOLUMEID_BTRFS
483 bool "btrfs filesystem"
484 default y
485 depends on VOLUMEID
486 help
487 TODO
488
489config FEATURE_VOLUMEID_REISERFS
490 bool "Reiser filesystem"
491 default y
492 depends on VOLUMEID
493 help
494 TODO
495
496config FEATURE_VOLUMEID_FAT
497 bool "fat filesystem"
498 default y
499 depends on VOLUMEID
500 help
501 TODO
502
503config FEATURE_VOLUMEID_HFS
504 bool "hfs filesystem"
505 default y
506 depends on VOLUMEID
507 help
508 TODO
509
510config FEATURE_VOLUMEID_JFS
511 bool "jfs filesystem"
512 default y
513 depends on VOLUMEID
514 help
515 TODO
516
517### config FEATURE_VOLUMEID_UFS
518### bool "ufs filesystem"
519### default y
520### depends on VOLUMEID
521### help
522### TODO
523
524config FEATURE_VOLUMEID_XFS
525 bool "xfs filesystem"
526 default y
527 depends on VOLUMEID
528 help
529 TODO
530
531config FEATURE_VOLUMEID_NTFS
532 bool "ntfs filesystem"
533 default y
534 depends on VOLUMEID
535 help
536 TODO
537
538config FEATURE_VOLUMEID_ISO9660
539 bool "iso9660 filesystem"
540 default y
541 depends on VOLUMEID
542 help
543 TODO
544
545config FEATURE_VOLUMEID_UDF
546 bool "udf filesystem"
547 default y
548 depends on VOLUMEID
549 help
550 TODO
551
552config FEATURE_VOLUMEID_LUKS
553 bool "luks filesystem"
554 default y
555 depends on VOLUMEID
556 help
557 TODO
558
559config FEATURE_VOLUMEID_LINUXSWAP
560 bool "linux swap filesystem"
561 default y
562 depends on VOLUMEID
563 help
564 TODO
565
566### config FEATURE_VOLUMEID_LVM
567### bool "lvm"
568### default y
569### depends on VOLUMEID
570### help
571### TODO
572
573config FEATURE_VOLUMEID_CRAMFS
574 bool "cramfs filesystem"
575 default y
576 depends on VOLUMEID
577 help
578 TODO
579
580### config FEATURE_VOLUMEID_HPFS
581### bool "hpfs filesystem"
582### default y
583### depends on VOLUMEID
584### help
585### TODO
586
587config FEATURE_VOLUMEID_ROMFS
588 bool "romfs filesystem"
589 default y
590 depends on VOLUMEID
591 help
592 TODO
593
594config FEATURE_VOLUMEID_SYSV
595 bool "sysv filesystem"
596 default y
597 depends on VOLUMEID
598 help
599 TODO
600
601### config FEATURE_VOLUMEID_MINIX
602### bool "minix filesystem"
603### default y
604### depends on VOLUMEID
605### help
606### TODO
607
608### These only detect partition tables - not used (yet?)
609### config FEATURE_VOLUMEID_MAC
610### bool "mac filesystem"
611### default y
612### depends on VOLUMEID
613### help
614### TODO
615###
616### config FEATURE_VOLUMEID_MSDOS
617### bool "msdos filesystem"
618### default y
619### depends on VOLUMEID
620### help
621### TODO
622
623config FEATURE_VOLUMEID_OCFS2
624 bool "ocfs2 filesystem"
625 default y
626 depends on VOLUMEID
627 help
628 TODO
629
630### config FEATURE_VOLUMEID_HIGHPOINTRAID
631### bool "highpoint raid"
632### default y
633### depends on VOLUMEID
634### help
635### TODO
636
637### config FEATURE_VOLUMEID_ISWRAID
638### bool "intel raid"
639### default y
640### depends on VOLUMEID
641### help
642### TODO
643
644### config FEATURE_VOLUMEID_LSIRAID
645### bool "lsi raid"
646### default y
647### depends on VOLUMEID
648### help
649### TODO
650
651### config FEATURE_VOLUMEID_VIARAID
652### bool "via raid"
653### default y
654### depends on VOLUMEID
655### help
656### TODO
657
658### config FEATURE_VOLUMEID_SILICONRAID
659### bool "silicon raid"
660### default y
661### depends on VOLUMEID
662### help
663### TODO
664
665### config FEATURE_VOLUMEID_NVIDIARAID
666### bool "nvidia raid"
667### default y
668### depends on VOLUMEID
669### help
670### TODO
671
672### config FEATURE_VOLUMEID_PROMISERAID
673### bool "promise raid"
674### default y
675### depends on VOLUMEID
676### help
677### TODO
678
679config FEATURE_VOLUMEID_LINUXRAID
680 bool "linuxraid"
681 default y
682 depends on VOLUMEID
683 help
684 TODO
685
686config MOUNT
687 bool "mount"
688 default y
689 help
690 All files and filesystems in Unix are arranged into one big directory
691 tree. The 'mount' utility is used to graft a filesystem onto a
692 particular part of the tree. A filesystem can either live on a block
693 device, or it can be accessible over the network, as is the case with
694 NFS filesystems. Most people using BusyBox will also want to enable
695 the 'mount' utility.
696
697config FEATURE_MOUNT_FAKE
698 bool "Support option -f"
699 default y
700 depends on MOUNT
701 help
702 Enable support for faking a file system mount.
703
704config FEATURE_MOUNT_VERBOSE
705 bool "Support option -v"
706 default y
707 depends on MOUNT
708 help
709 Enable multi-level -v[vv...] verbose messages. Useful if you
710 debug mount problems and want to see what is exactly passed
711 to the kernel.
712
713config FEATURE_MOUNT_HELPERS
714 bool "Support mount helpers"
715 default n
716 depends on MOUNT
717 help
718 Enable mounting of virtual file systems via external helpers.
719 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
720 "obexfs -b00.11.22.33.44.55 /mnt"
721 Also "mount -t sometype [-o opts] fs /mnt" will try
722 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
723 The idea is to use such virtual filesystems in /etc/fstab.
724
725config FEATURE_MOUNT_LABEL
726 bool "Support specifiying devices by label or UUID"
727 default y
728 depends on MOUNT
729 select VOLUMEID
730 help
731 This allows for specifying a device by label or uuid, rather than by
732 name. This feature utilizes the same functionality as blkid/findfs.
733 This also enables label or uuid support for swapon.
734
735config FEATURE_MOUNT_NFS
736 bool "Support mounting NFS file systems"
737 default y
738 depends on MOUNT
739 select FEATURE_HAVE_RPC
740 select FEATURE_SYSLOG
741 help
742 Enable mounting of NFS file systems.
743
744config FEATURE_MOUNT_CIFS
745 bool "Support mounting CIFS/SMB file systems"
746 default y
747 depends on MOUNT
748 help
749 Enable support for samba mounts.
750
751config FEATURE_MOUNT_FLAGS
752 depends on MOUNT
753 bool "Support lots of -o flags in mount"
754 default y
755 help
756 Without this, mount only supports ro/rw/remount. With this, it
757 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
758 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
759 private, unbindable, rshared, rslave, rprivate, and runbindable.
760
761config FEATURE_MOUNT_FSTAB
762 depends on MOUNT
763 bool "Support /etc/fstab and -a"
764 default y
765 help
766 Support mount all and looking for files in /etc/fstab.
767
768config PIVOT_ROOT
769 bool "pivot_root"
770 default y
771 help
772 The pivot_root utility swaps the mount points for the root filesystem
773 with some other mounted filesystem. This allows you to do all sorts
774 of wild and crazy things with your Linux system and is far more
775 powerful than 'chroot'.
776
777 Note: This is for initrd in linux 2.4. Under initramfs (introduced
778 in linux 2.6) use switch_root instead.
779
780config RDATE
781 bool "rdate"
782 default y
783 help
784 The rdate utility allows you to synchronize the date and time of your
785 system clock with the date and time of a remote networked system using
786 the RFC868 protocol, which is built into the inetd daemon on most
787 systems.
788
789config RDEV
790 bool "rdev"
791 default y
792 help
793 Print the device node associated with the filesystem mounted at '/'.
794
795config READPROFILE
796 bool "readprofile"
797 default y
798 help
799 This allows you to parse /proc/profile for basic profiling.
800
801config RTCWAKE
802 bool "rtcwake"
803 default y
804 help
805 Enter a system sleep state until specified wakeup time.
806
807config SCRIPT
808 bool "script"
809 default y
810 help
811 The script makes typescript of terminal session.
812
813config SCRIPTREPLAY
814 bool "scriptreplay"
815 default y
816 help
817 This program replays a typescript, using timing information
818 given by script -t.
819
820config SETARCH
821 bool "setarch"
822 default y
823 help
824 The linux32 utility is used to create a 32bit environment for the
825 specified program (usually a shell). It only makes sense to have
826 this util on a system that supports both 64bit and 32bit userland
827 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
828
829config SWAPONOFF
830 bool "swaponoff"
831 default y
832 help
833 This option enables both the 'swapon' and the 'swapoff' utilities.
834 Once you have created some swap space using 'mkswap', you also need
835 to enable your swap space with the 'swapon' utility. The 'swapoff'
836 utility is used, typically at system shutdown, to disable any swap
837 space. If you are not using any swap space, you can leave this
838 option disabled.
839
840config FEATURE_SWAPON_PRI
841 bool "Support priority option -p"
842 default y
843 depends on SWAPONOFF
844 help
845 Enable support for setting swap device priority in swapon.
846
847config SWITCH_ROOT
848 bool "switch_root"
849 default y
850 help
851 The switch_root utility is used from initramfs to select a new
852 root device. Under initramfs, you have to use this instead of
853 pivot_root. (Stop reading here if you don't care why.)
854
855 Booting with initramfs extracts a gzipped cpio archive into rootfs
856 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
857 or unmounted*, pivot_root will not work from initramfs. Instead,
858 switch_root deletes everything out of rootfs (including itself),
859 does a mount --move that overmounts rootfs with the new root, and
860 then execs the specified init program.
861
862 * Because the Linux kernel uses rootfs internally as the starting
863 and ending point for searching through the kernel's doubly linked
864 list of active mount points. That's why.
865
866config UMOUNT
867 bool "umount"
868 default y
869 help
870 When you want to remove a mounted filesystem from its current mount
871 point, for example when you are shutting down the system, the
872 'umount' utility is the tool to use. If you enabled the 'mount'
873 utility, you almost certainly also want to enable 'umount'.
874
875config FEATURE_UMOUNT_ALL
876 bool "Support option -a"
877 default y
878 depends on UMOUNT
879 help
880 Support -a option to unmount all currently mounted filesystems.
881
882comment "Common options for mount/umount"
883 depends on MOUNT || UMOUNT
884
885config FEATURE_MOUNT_LOOP
886 bool "Support loopback mounts"
887 default y
888 depends on MOUNT || UMOUNT
889 help
890 Enabling this feature allows automatic mounting of files (containing
891 filesystem images) via the linux kernel's loopback devices.
892 The mount command will detect you are trying to mount a file instead
893 of a block device, and transparently associate the file with a
894 loopback device. The umount command will also free that loopback
895 device.
896
897 You can still use the 'losetup' utility (to manually associate files
898 with loop devices) if you need to do something advanced, such as
899 specify an offset or cryptographic options to the loopback device.
900 (If you don't want umount to free the loop device, use "umount -D".)
901
902config FEATURE_MOUNT_LOOP_CREATE
903 bool "Create new loopback devices if needed"
904 default y
905 depends on FEATURE_MOUNT_LOOP
906 help
907 Linux kernels >= 2.6.24 support unlimited loopback devices. They are
908 allocated for use when trying to use a loop device. The loop device
909 must however exist.
910
911 This feature lets mount to try to create next /dev/loopN device
912 if it does not find a free one.
913
914config FEATURE_MTAB_SUPPORT
915 bool "Support for the old /etc/mtab file"
916 default n
917 depends on MOUNT || UMOUNT
918 select FEATURE_MOUNT_FAKE
919 help
920 Historically, Unix systems kept track of the currently mounted
921 partitions in the file "/etc/mtab". These days, the kernel exports
922 the list of currently mounted partitions in "/proc/mounts", rendering
923 the old mtab file obsolete. (In modern systems, /etc/mtab should be
924 a symlink to /proc/mounts.)
925
926 The only reason to have mount maintain an /etc/mtab file itself is if
927 your stripped-down embedded system does not have a /proc directory.
928 If you must use this, keep in mind it's inherently brittle (for
929 example a mount under chroot won't update it), can't handle modern
930 features like separate per-process filesystem namespaces, requires
931 that your /etc directory be writeable, tends to get easily confused
932 by --bind or --move mounts, won't update if you rename a directory
933 that contains a mount point, and so on. (In brief: avoid.)
934
935 About the only reason to use this is if you've removed /proc from
936 your kernel.
937
938endmenu
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