+/*
+ * Mini umount implementation for busybox
+ *
+ *
+ * Copyright (C) 1999 by Lineo, inc.
+ * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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 "internal.h"
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
#include <stdio.h>
-#include <mntent.h>
#include <sys/mount.h>
+#include <mntent.h>
+#include <fstab.h>
+#include <errno.h>
-const char umount_usage[] = "umount {filesystem|directory}\n"
-"\tumount -a\n"
+static const char umount_usage[] =
+"umount [flags] filesystem|directory\n\n"
+"Flags:\n"
+"\t-a:\tUnmount all file systems"
+#ifdef BB_MTAB
+" in /etc/mtab\n\t-n:\tDon't erase /etc/mtab entries\n"
+#else
"\n"
-"\tUnmount a filesystem.\n"
-"\t-a:\tUnmounts all mounted filesystems.\n";
+#endif
+;
-static char *
-stralloc(const char * string)
-{
- int length = strlen(string) + 1;
- char * n = malloc(length);
- memcpy(n, string, length);
- return n;
-}
-extern void
-erase_mtab(const char * name)
+static int useMtab = TRUE;
+static int umountAll = FALSE;
+extern const char mtab_file[]; /* Defined in utility.c */
+
+#define MIN(x,y) (x > y ? x : y)
+
+static int
+do_umount(const char* name, int useMtab)
{
- struct mntent entries[100];
- int count = 0;
- FILE * mountTable = setmntent("/etc/mtab", "r");
- struct mntent * m;
-
- if ( mountTable == 0
- && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
- name_and_error("/etc/mtab");
- return;
- }
+ int status;
+ struct mntent *m;
+ FILE *mountTable;
+ const char *blockDevice = NULL;
- while ( (m = getmntent(mountTable)) != 0 ) {
- entries[count].mnt_fsname = stralloc(m->mnt_fsname);
- entries[count].mnt_dir = stralloc(m->mnt_dir);
- entries[count].mnt_type = stralloc(m->mnt_type);
- entries[count].mnt_opts = stralloc(m->mnt_opts);
- entries[count].mnt_freq = m->mnt_freq;
- entries[count].mnt_passno = m->mnt_passno;
- count++;
- }
- endmntent(mountTable);
- if ( (mountTable = setmntent("/etc/mtab", "w")) ) {
- int i;
- for ( i = 0; i < count; i++ ) {
- int result = ( strcmp(entries[i].mnt_fsname, name) == 0
- || strcmp(entries[i].mnt_dir, name) == 0 );
-
- if ( result )
- continue;
- else
- addmntent(mountTable, &entries[i]);
- }
- endmntent(mountTable);
+ if ((mountTable = setmntent (mtab_file, "r"))) {
+ while ((m = getmntent (mountTable)) != 0) {
+ if (strncmp(m->mnt_dir, name,
+ MIN(strlen(m->mnt_dir),strlen(name))) == 0)
+ blockDevice = m->mnt_fsname;
+ else if (strcmp(m->mnt_fsname, name) == 0) {
+ blockDevice = name;
+ name = m->mnt_dir;
+ }
}
- else if ( errno != EROFS )
- name_and_error("/etc/mtab");
+ }
+
+ status = umount(name);
+
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (blockDevice != NULL && !strncmp("/dev/loop", blockDevice, 9))
+ /* this was a loop device, delete it */
+ del_loop(blockDevice);
+#endif
+#if defined BB_MTAB
+ if ( status == 0 ) {
+ if ( useMtab==TRUE )
+ erase_mtab(name);
+ return 0;
+ }
+ else
+#endif
+ return(status);
}
static int
-umount_all(int noMtab)
+umount_all(int useMtab)
{
- struct mntent entries[100];
- int count = 0;
- FILE * mountTable = setmntent("/etc/mtab", "r");
- struct mntent * m;
- int status = 0;
-
- if ( mountTable == 0
- && (mountTable = setmntent("/proc/mounts", "r")) == 0 ) {
- name_and_error("/etc/mtab");
- return 1;
- }
+ int status;
+ struct mntent *m;
+ FILE *mountTable;
- while ( (m = getmntent(mountTable)) != 0 ) {
- entries[count].mnt_fsname = stralloc(m->mnt_fsname);
- count++;
- }
- endmntent(mountTable);
-
- while ( count > 0 ) {
- int result = umount(entries[--count].mnt_fsname) == 0;
- /* free(entries[count].mnt_fsname); */
- if ( result ) {
- if ( !noMtab )
- erase_mtab(entries[count].mnt_fsname);
+ if ((mountTable = setmntent (mtab_file, "r"))) {
+ while ((m = getmntent (mountTable)) != 0) {
+ char *blockDevice = m->mnt_fsname;
+#if ! defined BB_MTAB
+ if (strcmp (blockDevice, "/dev/root") == 0) {
+ struct fstab* fstabItem;
+ fstabItem = getfsfile ("/");
+ if (fstabItem != NULL) {
+ blockDevice = fstabItem->fs_spec;
+ }
}
- else {
- status = 1;
- name_and_error(entries[count].mnt_fsname);
+#endif
+ /* Don't umount /proc when doing umount -a */
+ if (strcmp (blockDevice, "proc") == 0)
+ continue;
+
+ status=do_umount (m->mnt_dir, useMtab);
+ if (status!=0) {
+ /* Don't bother retrying the umount on busy devices */
+ if (errno==EBUSY) {
+ perror(m->mnt_dir);
+ continue;
+ }
+ status=do_umount (blockDevice, useMtab);
+ if (status!=0) {
+ printf ("Couldn't umount %s on %s (type %s): %s\n",
+ blockDevice, m->mnt_dir, m->mnt_type, strerror(errno));
+ }
}
- }
- return status;
+ }
+ endmntent (mountTable);
+ }
+ return( TRUE);
}
extern int
-do_umount(const char * name, int noMtab)
+umount_main(int argc, char** argv)
{
- if ( umount(name) == 0 ) {
- if ( !noMtab )
- erase_mtab(name);
- return 0;
- }
- return 1;
-}
+ if (argc < 2) {
+ usage( umount_usage);
+ }
-extern int
-umount_main(struct FileInfo * i, int argc, char * * argv)
-{
- int noMtab = 0;
-
- if ( argv[1][0] == '-' ) {
- switch ( argv[1][1] ) {
- case 'a':
- return umount_all(noMtab);
- case 'n':
- noMtab = 1;
- break;
- default:
- usage(umount_usage);
- return 1;
- }
+ /* Parse any options */
+ while (--argc > 0 && **(++argv) == '-') {
+ while (*++(*argv)) switch (**argv) {
+ case 'a':
+ umountAll = TRUE;
+ break;
+#ifdef BB_MTAB
+ case 'n':
+ useMtab = FALSE;
+ break;
+#endif
+ default:
+ usage( umount_usage);
}
- if ( do_umount(argv[1],noMtab) != 0 ) {
- fprintf(stderr, "%s: %s.\n", argv[1], strerror(errno));
- return 1;
- }
- return 0;
+ }
+
+
+ if(umountAll==TRUE) {
+ exit(umount_all(useMtab));
+ }
+ if ( do_umount(*argv,useMtab) == 0 )
+ exit (TRUE);
+ else {
+ perror("umount");
+ exit(FALSE);
+ }
}
+
projects / oweals / busybox.git / blobdiff