This commit was manufactured by cvs2svn to create tag 'busybox_1_00'.

1 files changed, 298 insertions, 0 deletions

diff --git a/busybox/util-linux/umount.c b/busybox/util-linux/umount.c
new file mode 100644
index 0000000..21c2e6e
--- /dev/null
+++ b/busybox/util-linux/umount.c
@@ -0,0 +1,298 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini umount implementation for busybox
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include "busybox.h"
+
+/* Teach libc5 about realpath -- it includes it but the
+ * prototype is missing... */
+#if (__GLIBC__ <= 2) && (__GLIBC_MINOR__ < 1)
+extern char *realpath(const char *path, char *resolved_path);
+#endif
+
+static const int MNT_FORCE = 1;
+static const int MS_MGC_VAL = 0xc0ed0000; /* Magic number indicatng "new" flags */
+static const int MS_REMOUNT = 32;	/* Alter flags of a mounted FS.  */
+static const int MS_RDONLY = 1;	/* Mount read-only.  */
+
+extern int mount (__const char *__special_file, __const char *__dir,
+			__const char *__fstype, unsigned long int __rwflag,
+			__const void *__data);
+extern int umount (__const char *__special_file);
+extern int umount2 (__const char *__special_file, int __flags);
+
+struct _mtab_entry_t {
+	char *device;
+	char *mountpt;
+	struct _mtab_entry_t *next;
+};
+
+static struct _mtab_entry_t *mtab_cache = NULL;
+
+
+
+#if defined CONFIG_FEATURE_MOUNT_FORCE
+static int doForce = FALSE;
+#endif
+#if defined CONFIG_FEATURE_MOUNT_LOOP
+static int freeLoop = TRUE;
+#endif
+#if defined CONFIG_FEATURE_MTAB_SUPPORT
+static int useMtab = TRUE;
+#endif
+static int umountAll = FALSE;
+static int doRemount = FALSE;
+
+
+
+/* These functions are here because the getmntent functions do not appear
+ * to be re-entrant, which leads to all sorts of problems when we try to
+ * use them recursively - randolph
+ *
+ * TODO: Perhaps switch to using Glibc's getmntent_r
+ *        -Erik
+ */
+static void mtab_read(void)
+{
+	struct _mtab_entry_t *entry = NULL;
+	struct mntent *e;
+	FILE *fp;
+
+	if (mtab_cache != NULL)
+		return;
+
+	if ((fp = setmntent(bb_path_mtab_file, "r")) == NULL) {
+		bb_error_msg("Cannot open %s", bb_path_mtab_file);
+		return;
+	}
+	while ((e = getmntent(fp))) {
+		entry = xmalloc(sizeof(struct _mtab_entry_t));
+		entry->device = strdup(e->mnt_fsname);
+		entry->mountpt = strdup(e->mnt_dir);
+		entry->next = mtab_cache;
+		mtab_cache = entry;
+	}
+	endmntent(fp);
+}
+
+static char *mtab_getinfo(const char *match, const char which)
+{
+	struct _mtab_entry_t *cur = mtab_cache;
+
+	while (cur) {
+		if (strcmp(cur->mountpt, match) == 0 ||
+			strcmp(cur->device, match) == 0) {
+			if (which == MTAB_GETMOUNTPT) {
+				return cur->mountpt;
+			} else {
+#if !defined CONFIG_FEATURE_MTAB_SUPPORT
+				if (strcmp(cur->device, "rootfs") == 0) {
+					continue;
+				} else if (strcmp(cur->device, "/dev/root") == 0) {
+					/* Adjusts device to be the real root device,
+					 * or leaves device alone if it can't find it */
+					cur->device = find_real_root_device_name();
+				}
+#endif
+				return cur->device;
+			}
+		}
+		cur = cur->next;
+	}
+	return NULL;
+}
+
+static char *mtab_next(void **iter)
+{
+	char *mp;
+
+	if (iter == NULL || *iter == NULL)
+		return NULL;
+	mp = ((struct _mtab_entry_t *) (*iter))->mountpt;
+	*iter = (void *) ((struct _mtab_entry_t *) (*iter))->next;
+	return mp;
+}
+
+static char *mtab_first(void **iter)
+{
+	struct _mtab_entry_t *mtab_iter;
+
+	if (!iter)
+		return NULL;
+	mtab_iter = mtab_cache;
+	*iter = (void *) mtab_iter;
+	return mtab_next(iter);
+}
+
+/* Don't bother to clean up, since exit() does that
+ * automagically, so we can save a few bytes */
+#ifdef CONFIG_FEATURE_CLEAN_UP
+static void mtab_free(void)
+{
+	struct _mtab_entry_t *this, *next;
+
+	this = mtab_cache;
+	while (this) {
+		next = this->next;
+		free(this->device);
+		free(this->mountpt);
+		free(this);
+		this = next;
+	}
+}
+#endif
+
+static int do_umount(const char *name)
+{
+	int status;
+	char *blockDevice = mtab_getinfo(name, MTAB_GETDEVICE);
+
+	if (blockDevice && strcmp(blockDevice, name) == 0)
+		name = mtab_getinfo(blockDevice, MTAB_GETMOUNTPT);
+
+	status = umount(name);
+
+#if defined CONFIG_FEATURE_MOUNT_LOOP
+	if (freeLoop && blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
+		/* this was a loop device, delete it */
+		del_loop(blockDevice);
+#endif
+#if defined CONFIG_FEATURE_MOUNT_FORCE
+	if (status != 0 && doForce) {
+		status = umount2(blockDevice, MNT_FORCE);
+		if (status != 0) {
+			bb_error_msg_and_die("forced umount of %s failed!", blockDevice);
+		}
+	}
+#endif
+	if (status != 0 && doRemount && errno == EBUSY) {
+		status = mount(blockDevice, name, NULL,
+					   MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
+		if (status == 0) {
+			bb_error_msg("%s busy - remounted read-only", blockDevice);
+		} else {
+			bb_error_msg("Cannot remount %s read-only", blockDevice);
+		}
+	}
+	if (status == 0) {
+#if defined CONFIG_FEATURE_MTAB_SUPPORT
+		if (useMtab)
+			erase_mtab(name);
+#endif
+		return (TRUE);
+	}
+	return (FALSE);
+}
+
+static int umount_all(void)
+{
+	int status = TRUE;
+	char *mountpt;
+	void *iter;
+
+	for (mountpt = mtab_first(&iter); mountpt; mountpt = mtab_next(&iter)) {
+		/* Never umount /proc on a umount -a */
+		if (strstr(mountpt, "proc")!= NULL)
+			continue;
+		if (!do_umount(mountpt)) {
+			/* Don't bother retrying the umount on busy devices */
+			if (errno == EBUSY) {
+				bb_perror_msg("%s", mountpt);
+				status = FALSE;
+				continue;
+			}
+			if (!do_umount(mountpt)) {
+				printf("Couldn't umount %s on %s: %s\n",
+					   mountpt, mtab_getinfo(mountpt, MTAB_GETDEVICE),
+					   strerror(errno));
+				status = FALSE;
+			}
+		}
+	}
+	return (status);
+}
+
+extern int umount_main(int argc, char **argv)
+{
+	char path[PATH_MAX], result = 0;
+
+	if (argc < 2) {
+		bb_show_usage();
+	}
+#ifdef CONFIG_FEATURE_CLEAN_UP
+	atexit(mtab_free);
+#endif
+
+	/* Parse any options */
+	while (--argc > 0 && **(++argv) == '-') {
+		while (*++(*argv))
+			switch (**argv) {
+			case 'a':
+				umountAll = TRUE;
+				break;
+#if defined CONFIG_FEATURE_MOUNT_LOOP
+			case 'l':
+				freeLoop = FALSE;
+				break;
+#endif
+#ifdef CONFIG_FEATURE_MTAB_SUPPORT
+			case 'n':
+				useMtab = FALSE;
+				break;
+#endif
+#ifdef CONFIG_FEATURE_MOUNT_FORCE
+			case 'f':
+				doForce = TRUE;
+				break;
+#endif
+			case 'r':
+				doRemount = TRUE;
+				break;
+			case 'v':
+				break; /* ignore -v */
+			default:
+				bb_show_usage();
+			}
+	}
+
+	mtab_read();
+	if (umountAll) {
+		if (umount_all())
+			return EXIT_SUCCESS;
+		else
+			return EXIT_FAILURE;
+	}
+
+	do {
+		if (realpath(*argv, path) != NULL)
+			if (do_umount(path))
+				continue;
+		bb_perror_msg("%s", path);
+		result++;
+	} while (--argc > 0 && ++argv);
+	return result;
+}