* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2005 by Rob Landley <rob@landley.net>
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
+
+//usage:#define umount_trivial_usage
+//usage: "[OPTIONS] FILESYSTEM|DIRECTORY"
+//usage:#define umount_full_usage "\n\n"
+//usage: "Unmount file systems\n"
+//usage: IF_FEATURE_UMOUNT_ALL(
+//usage: "\n -a Unmount all file systems" IF_FEATURE_MTAB_SUPPORT(" in /etc/mtab")
+//usage: )
+//usage: IF_FEATURE_MTAB_SUPPORT(
+//usage: "\n -n Don't erase /etc/mtab entries"
+//usage: )
+//usage: "\n -r Try to remount devices as read-only if mount is busy"
+//usage: "\n -l Lazy umount (detach filesystem)"
+//usage: "\n -f Force umount (i.e., unreachable NFS server)"
+//usage: IF_FEATURE_MOUNT_LOOP(
+//usage: "\n -D Don't free loop device even if it has been used"
+//usage: )
+//usage:
+//usage:#define umount_example_usage
+//usage: "$ umount /dev/hdc1\n"
+
#include <mntent.h>
#include <sys/mount.h>
-/* Make sure we have all the new mount flags we actually try to use. */
-#ifndef MS_BIND
-# define MS_BIND (1 << 12)
-#endif
-#ifndef MS_MOVE
-# define MS_MOVE (1 << 13)
-#endif
-#ifndef MS_RECURSIVE
-# define MS_RECURSIVE (1 << 14)
-#endif
-#ifndef MS_SILENT
-# define MS_SILENT (1 << 15)
-#endif
-/* The shared subtree stuff, which went in around 2.6.15. */
-#ifndef MS_UNBINDABLE
-# define MS_UNBINDABLE (1 << 17)
-#endif
-#ifndef MS_PRIVATE
-# define MS_PRIVATE (1 << 18)
-#endif
-#ifndef MS_SLAVE
-# define MS_SLAVE (1 << 19)
-#endif
-#ifndef MS_SHARED
-# define MS_SHARED (1 << 20)
-#endif
-#ifndef MS_RELATIME
-# define MS_RELATIME (1 << 21)
-#endif
#include "libbb.h"
-#ifndef PATH_MAX
-# define PATH_MAX (4*1024)
-#endif
-
#if defined(__dietlibc__)
+// TODO: This does not belong here.
/* 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
* dietlibc-0.30 does not have implementation of getmntent_r() */
static struct mntent *getmntent_r(FILE* stream, struct mntent* result,
}
#endif
-/* ignored: -v -d -t -i */
-#define OPTION_STRING "fldnra" "vdt:i"
-#define OPT_FORCE (1 << 0)
-#define OPT_LAZY (1 << 1)
-#define OPT_FREELOOP (1 << 2)
-#define OPT_NO_MTAB (1 << 3)
-#define OPT_REMOUNT (1 << 4)
-#define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 5) : 0)
-
-// These constants from linux/fs.h must match OPT_FORCE and OPT_LAZY,
-// otherwise "doForce" trick below won't work!
-//#define MNT_FORCE 0x00000001 /* Attempt to forcibly umount */
-//#define MNT_DETACH 0x00000002 /* Just detach from the tree */
+/* Ignored: -v -t -i
+ * bbox always acts as if -d is present.
+ * -D can be used to suppress it (bbox extension).
+ * Rationale:
+ * (1) util-linux's umount does it if "loop=..." is seen in /etc/mtab:
+ * thus, on many systems, bare umount _does_ drop loop devices.
+ * (2) many users request this feature.
+ */
+#define OPTION_STRING "fldDnra" "vt:i"
+#define OPT_FORCE (1 << 0) // Same as MNT_FORCE
+#define OPT_LAZY (1 << 1) // Same as MNT_DETACH
+//#define OPT_FREE_LOOP (1 << 2) // -d is assumed always present
+#define OPT_DONT_FREE_LOOP (1 << 3)
+#define OPT_NO_MTAB (1 << 4)
+#define OPT_REMOUNT (1 << 5)
+#define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 6) : 0)
int umount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int umount_main(int argc UNUSED_PARAM, char **argv)
{
int doForce;
- char *const buf = xmalloc(PATH_MAX * 2 + 128); /* to save stack */
struct mntent me;
FILE *fp;
char *fstype = NULL;
opt = getopt32(argv, OPTION_STRING, &fstype);
//argc -= optind;
argv += optind;
+
+ // MNT_FORCE and MNT_DETACH (from linux/fs.h) must match
+ // OPT_FORCE and OPT_LAZY, otherwise this trick won't work:
doForce = MAX((opt & OPT_FORCE), (opt & OPT_LAZY));
/* Get a list of mount points from mtab. We read them all in now mostly
if (opt & OPT_ALL)
bb_error_msg_and_die("can't open '%s'", bb_path_mtab_file);
} else {
- while (getmntent_r(fp, &me, buf, PATH_MAX * 2 + 128)) {
+ while (getmntent_r(fp, &me, bb_common_bufsiz1, sizeof(bb_common_bufsiz1))) {
/* Match fstype if passed */
if (!match_fstype(&me, fstype))
continue;
} else {
// De-allocate the loop device. This ioctl should be ignored on
// any non-loop block devices.
- if (ENABLE_FEATURE_MOUNT_LOOP && (opt & OPT_FREELOOP) && m)
+ if (ENABLE_FEATURE_MOUNT_LOOP && !(opt & OPT_DONT_FREE_LOOP) && m)
del_loop(m->device);
if (ENABLE_FEATURE_MTAB_SUPPORT && !(opt & OPT_NO_MTAB) && m)
erase_mtab(m->dir);
free(mtl);
mtl = m;
}
- free(buf);
}
return status;
projects / platform / upstream / busybox.git / blobdiff