linux/include/linux/mount.h

/* 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 <[email protected]>
 *
 */
#ifndef _LINUX_MOUNT_H
#define _LINUX_MOUNT_H

#include <linux/types.h>
#include <asm/barrier.h>

struct super_block;
struct dentry;
struct user_namespace;
struct mnt_idmap;
struct file_system_type;
struct fs_context;
struct file;
struct path;

#define MNT_NOSUID …
#define MNT_NODEV …
#define MNT_NOEXEC …
#define MNT_NOATIME …
#define MNT_NODIRATIME …
#define MNT_RELATIME …
#define MNT_READONLY …
#define MNT_NOSYMFOLLOW …

#define MNT_SHRINKABLE …
#define MNT_WRITE_HOLD …

#define MNT_SHARED …
#define MNT_UNBINDABLE …
/*
 * 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 …
#define MNT_USER_SETTABLE_MASK …
#define MNT_ATIME_MASK …

#define MNT_INTERNAL_FLAGS …

#define MNT_INTERNAL …

#define MNT_LOCK_ATIME …
#define MNT_LOCK_NOEXEC …
#define MNT_LOCK_NOSUID …
#define MNT_LOCK_NODEV …
#define MNT_LOCK_READONLY …
#define MNT_LOCKED …
#define MNT_DOOMED …
#define MNT_SYNC_UMOUNT …
#define MNT_MARKED …
#define MNT_UMOUNT …
#define MNT_ONRB …

struct vfsmount { … } __randomize_layout;

static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt)
{ … }

extern int mnt_want_write(struct vfsmount *mnt);
extern int mnt_want_write_file(struct file *file);
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 void mnt_make_shortterm(struct vfsmount *mnt);
extern struct vfsmount *mnt_clone_internal(const struct path *path);
extern bool __mnt_is_readonly(struct vfsmount *mnt);
extern bool mnt_may_suid(struct vfsmount *mnt);

extern struct vfsmount *clone_private_mount(const struct path *path);
int mnt_get_write_access(struct vfsmount *mnt);
void mnt_put_write_access(struct vfsmount *mnt);

extern struct vfsmount *fc_mount(struct fs_context *fc);
extern struct vfsmount *vfs_create_mount(struct fs_context *fc);
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 bool path_is_mountpoint(const struct path *path);

extern bool our_mnt(struct vfsmount *mnt);

extern struct vfsmount *kern_mount(struct file_system_type *);
extern void kern_unmount(struct vfsmount *mnt);
extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
extern long do_mount(const char *, const char __user *,
		     const char *, unsigned long, void *);
extern struct vfsmount *collect_mounts(const struct path *);
extern void drop_collected_mounts(struct vfsmount *);
extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
			  struct vfsmount *);
extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);

extern int cifs_root_data(char **dev, char **opts);

#endif /* _LINUX_MOUNT_H */