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authorErik Andersen2000-01-13 06:38:14 +0000
committerErik Andersen2000-01-13 06:38:14 +0000
commitb7cc49d992ed9a5a59261096012e0b4a811bb7f4 (patch)
treed151960bd89e78df235150a498cb63f39bfcab2e /umount.c
parent05df239ed90584156b820dbf3ede638208eb440f (diff)
downloadbusybox-b7cc49d992ed9a5a59261096012e0b4a811bb7f4.zip
busybox-b7cc49d992ed9a5a59261096012e0b4a811bb7f4.tar.gz
* Added -o loop option for mount, and support in umount for loop
devices. Support is toggled by MOUNT_LOOP feature -- Ben Collins <bcollins@debian.org> -Erik
Diffstat (limited to 'umount.c')
-rw-r--r--umount.c72
1 files changed, 64 insertions, 8 deletions
diff --git a/umount.c b/umount.c
index ab76be4..af1b3a4 100644
--- a/umount.c
+++ b/umount.c
@@ -28,6 +28,14 @@
#include <fstab.h>
#include <errno.h>
+#if defined BB_FEATURE_MOUNT_LOOP
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/loop.h>
+
+static int del_loop(const char *device);
+#endif
+
static const char umount_usage[] =
"Usage: umount [flags] filesystem|directory\n\n"
"Flags:\n"
@@ -44,23 +52,54 @@ 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);
+ int status;
+
+#if defined BB_FEATURE_MOUNT_LOOP
+ /* check to see if this is a loop device */
+ struct stat fst;
+ char dev[20];
+ const char *oldname = NULL;
+ int i;
+
+ if (stat(name, &fst)) {
+ fprintf(stderr, "umount: %s: %s\n", name, strerror(errno));
+ exit(1);
+ }
+ for (i = 0 ; i <= 7 ; i++) {
+ struct stat lst;
+ sprintf(dev, "/dev/loop%d", i);
+ if (stat(dev, &lst))
+ continue;
+ if (lst.st_dev == fst.st_dev) {
+ oldname = name;
+ name = dev;
+ break;
+ }
+ }
+#endif
+
+ status = umount(name);
+#if defined BB_FEATURE_MOUNT_LOOP
+ if (!strncmp("/dev/loop", name, 9)) { /* this was a loop device, delete it */
+ del_loop(name);
+ if (oldname != NULL)
+ name = oldname;
+ }
+#endif
+#if defined BB_MTAB
if ( status == 0 ) {
if ( useMtab==TRUE )
erase_mtab(name);
return 0;
}
- else
- return( status);
-}
+ else
#endif
+ return(status);
+}
static int
umount_all(int useMtab)
@@ -135,7 +174,24 @@ umount_main(int argc, char** argv)
exit (TRUE);
else {
perror("umount");
- exit( FALSE);
+ exit(FALSE);
}
}
+#if defined BB_FEATURE_MOUNT_LOOP
+static int del_loop(const char *device)
+{
+ int fd;
+
+ if ((fd = open(device, O_RDONLY)) < 0) {
+ perror(device);
+ exit(1);
+ }
+ if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
+ perror("ioctl: LOOP_CLR_FD");
+ exit(1);
+ }
+ close(fd);
+ return(0);
+}
+#endif