util-linux/util-linux-2.13-mount-twiceloop.patch
2006-09-15 09:08:32 +00:00

73 lines
2.3 KiB
Diff

--- util-linux-2.13-pre6/mount/fstab.h.twiceloop 2006-09-15 08:50:46.000000000 +0200
+++ util-linux-2.13-pre6/mount/fstab.h 2006-09-15 08:51:10.000000000 +0200
@@ -2,6 +2,7 @@
int mtab_is_writable(void);
int mtab_does_not_exist(void);
int is_mounted_once(const char *name);
+int is_mounted_same_loopfile(const char *loopfile, const char *dir);
struct mntentchn {
struct mntentchn *nxt, *prev;
--- util-linux-2.13-pre6/mount/mount.c.twiceloop 2006-09-15 08:50:23.000000000 +0200
+++ util-linux-2.13-pre6/mount/mount.c 2006-09-15 08:50:24.000000000 +0200
@@ -671,7 +671,7 @@
static int
loop_check(const char **spec, const char **type, int *flags,
- int *loop, const char **loopdev, const char **loopfile) {
+ int *loop, const char **loopdev, const char **loopfile, const char *dir) {
int looptype;
unsigned long long offset;
@@ -709,6 +709,11 @@
} else {
int loopro = (*flags & MS_RDONLY);
+ if (is_mounted_same_loopfile(*loopfile, dir)) {
+ error(_("mount: %s already mounted on %s"), *loopfile, dir);
+ return EX_FAIL;
+ }
+
if (!*loopdev || !**loopdev)
*loopdev = find_unused_loop_device();
if (!*loopdev)
@@ -856,7 +861,7 @@
* stale assignments of files to loop devices. Nasty when used for
* encryption.
*/
- res = loop_check(&spec, &types, &flags, &loop, &loopdev, &loopfile);
+ res = loop_check(&spec, &types, &flags, &loop, &loopdev, &loopfile, node);
if (res)
goto out;
}
--- util-linux-2.13-pre6/mount/fstab.c.twiceloop 2006-09-15 08:50:23.000000000 +0200
+++ util-linux-2.13-pre6/mount/fstab.c 2006-09-15 08:50:24.000000000 +0200
@@ -254,6 +254,27 @@
return (ct == 1);
}
+/*
+ * Given the loop file LOOPFILE, and the mount point DIR, check that
+ * same file is already mounted on same directory
+ *
+ * Don't forget there's
+ * /path/loopfile /path/dir loop=/dev/loop0
+ * in mtab for loop devices.
+ */
+int
+is_mounted_same_loopfile(const char *loopfile, const char *dir) {
+ struct mntentchn *mc, *mc0;
+ int ct = 0;
+
+ mc0 = mtab_head();
+ for (mc = mc0->prev; mc && mc != mc0; mc = mc->prev)
+ if (streq(mc->m.mnt_fsname, loopfile) &&
+ streq(mc->m.mnt_dir, dir))
+ ct++;
+ return (ct == 1);
+}
+
/* Given the name FILE, try to find the option "loop=FILE" in mtab. */
struct mntentchn *
getmntoptfile (const char *file) {