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Diffstat (limited to 'util-linux/umount.c')
-rw-r--r--util-linux/umount.c68
1 files changed, 53 insertions, 15 deletions
diff --git a/util-linux/umount.c b/util-linux/umount.c
index 95f7dfb3c..e749c5f0f 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -29,24 +29,54 @@
#include <errno.h>
static const char umount_usage[] =
-"Usage: umount filesystem\n"
-" or: umount directory\n"
-" or: umount -a"
-"to unmount all mounted file systems.\n";
+"Usage: umount [flags] filesystem|directory\n"
+"Optional 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"
+#endif
+;
+
+
+static int useMtab = TRUE;
+static int umountAll = FALSE;
+extern const char mtab_file[]; /* Defined in utility.c */
+
+#if ! defined BB_MTAB
+#define do_umount( blockDevice, useMtab) umount( blockDevice)
+#else
+static int
+do_umount(const char* name, int useMtab)
+{
+ int status = umount(name);
+
+ if ( status == 0 ) {
+ if ( useMtab==TRUE )
+ erase_mtab(name);
+ return 0;
+ }
+ else
+ return( status);
+}
+#endif
static int
-umount_all()
+umount_all(int useMtab)
{
int status;
struct mntent *m;
FILE *mountTable;
- if ((mountTable = setmntent ("/proc/mounts", "r"))) {
+ 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)
blockDevice = (getfsfile ("/"))->fs_spec;
- status=umount (m->mnt_dir);
+#endif
+ status=do_umount (m->mnt_dir, useMtab);
if (status!=0) {
/* Don't bother retrying the umount on busy devices */
if (errno==EBUSY) {
@@ -56,7 +86,7 @@ umount_all()
printf ("Trying to umount %s failed: %s\n",
m->mnt_dir, strerror(errno));
printf ("Instead trying to umount %s\n", blockDevice);
- status=umount (blockDevice);
+ 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));
@@ -69,27 +99,35 @@ umount_all()
}
extern int
-umount_main(int argc, char * * argv)
+umount_main(int argc, char** argv)
{
if (argc < 2) {
usage( umount_usage);
}
- argc--;
- argv++;
/* Parse any options */
- while (**argv == '-') {
+ while (argc-- > 0 && **(++argv) == '-') {
while (*++(*argv)) switch (**argv) {
case 'a':
- exit ( umount_all() );
+ umountAll = TRUE;
+ break;
+#ifdef BB_MTAB
+ case 'n':
+ useMtab = FALSE;
break;
+#endif
default:
usage( umount_usage);
}
}
- if ( umount(*argv) == 0 )
- exit (TRUE);
+
+
+ if(umountAll) {
+ exit(umount_all(useMtab));
+ }
+ if ( do_umount(*argv,useMtab) == 0 )
+ exit (TRUE);
else {
perror("umount");
exit( FALSE);