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