v4.19.13 snapshot.
diff --git a/include/linux/mount.h b/include/linux/mount.h
new file mode 100644
index 0000000..45b1f56
--- /dev/null
+++ b/include/linux/mount.h
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *
+ * Definitions for mount interface. This describes the in the kernel build
+ * linkedlist with mounted filesystems.
+ *
+ * Author: Marco van Wieringen <mvw@planets.elm.net>
+ *
+ */
+#ifndef _LINUX_MOUNT_H
+#define _LINUX_MOUNT_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/nodemask.h>
+#include <linux/spinlock.h>
+#include <linux/seqlock.h>
+#include <linux/atomic.h>
+
+struct super_block;
+struct vfsmount;
+struct dentry;
+struct mnt_namespace;
+
+#define MNT_NOSUID 0x01
+#define MNT_NODEV 0x02
+#define MNT_NOEXEC 0x04
+#define MNT_NOATIME 0x08
+#define MNT_NODIRATIME 0x10
+#define MNT_RELATIME 0x20
+#define MNT_READONLY 0x40 /* does the user want this to be r/o? */
+
+#define MNT_SHRINKABLE 0x100
+#define MNT_WRITE_HOLD 0x200
+
+#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
+#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
+/*
+ * MNT_SHARED_MASK is the set of flags that should be cleared when a
+ * mount becomes shared. Currently, this is only the flag that says a
+ * mount cannot be bind mounted, since this is how we create a mount
+ * that shares events with another mount. If you add a new MNT_*
+ * flag, consider how it interacts with shared mounts.
+ */
+#define MNT_SHARED_MASK (MNT_UNBINDABLE)
+#define MNT_USER_SETTABLE_MASK (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \
+ | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \
+ | MNT_READONLY)
+#define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )
+
+#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
+ MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED)
+
+#define MNT_INTERNAL 0x4000
+
+#define MNT_LOCK_ATIME 0x040000
+#define MNT_LOCK_NOEXEC 0x080000
+#define MNT_LOCK_NOSUID 0x100000
+#define MNT_LOCK_NODEV 0x200000
+#define MNT_LOCK_READONLY 0x400000
+#define MNT_LOCKED 0x800000
+#define MNT_DOOMED 0x1000000
+#define MNT_SYNC_UMOUNT 0x2000000
+#define MNT_MARKED 0x4000000
+#define MNT_UMOUNT 0x8000000
+
+struct vfsmount {
+ struct dentry *mnt_root; /* root of the mounted tree */
+ struct super_block *mnt_sb; /* pointer to superblock */
+ int mnt_flags;
+} __randomize_layout;
+
+struct file; /* forward dec */
+struct path;
+
+extern int mnt_want_write(struct vfsmount *mnt);
+extern int mnt_want_write_file(struct file *file);
+extern int mnt_clone_write(struct vfsmount *mnt);
+extern void mnt_drop_write(struct vfsmount *mnt);
+extern void mnt_drop_write_file(struct file *file);
+extern void mntput(struct vfsmount *mnt);
+extern struct vfsmount *mntget(struct vfsmount *mnt);
+extern struct vfsmount *mnt_clone_internal(const struct path *path);
+extern int __mnt_is_readonly(struct vfsmount *mnt);
+extern bool mnt_may_suid(struct vfsmount *mnt);
+
+struct path;
+extern struct vfsmount *clone_private_mount(const struct path *path);
+
+struct file_system_type;
+extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
+ int flags, const char *name,
+ void *data);
+extern struct vfsmount *vfs_submount(const struct dentry *mountpoint,
+ struct file_system_type *type,
+ const char *name, void *data);
+
+extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
+extern void mark_mounts_for_expiry(struct list_head *mounts);
+
+extern dev_t name_to_dev_t(const char *name);
+
+extern unsigned int sysctl_mount_max;
+
+extern bool path_is_mountpoint(const struct path *path);
+
+#endif /* _LINUX_MOUNT_H */