| /* 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; |
| struct fs_context; |
| |
| #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_NOSYMFOLLOW 0x80 |
| |
| #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 | MNT_NOSYMFOLLOW) |
| #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 | \ |
| MNT_CURSOR) |
| |
| #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 |
| #define MNT_CURSOR 0x10000000 |
| |
| struct vfsmount { |
| struct dentry *mnt_root; /* root of the mounted tree */ |
| struct super_block *mnt_sb; /* pointer to superblock */ |
| int mnt_flags; |
| struct user_namespace *mnt_userns; |
| } __randomize_layout; |
| |
| static inline struct user_namespace *mnt_user_ns(const struct vfsmount *mnt) |
| { |
| /* Pairs with smp_store_release() in do_idmap_mount(). */ |
| return smp_load_acquire(&mnt->mnt_userns); |
| } |
| |
| struct file; /* forward dec */ |
| struct path; |
| |
| 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 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); |
| |
| struct path; |
| extern struct vfsmount *clone_private_mount(const struct path *path); |
| extern int __mnt_want_write(struct vfsmount *); |
| extern void __mnt_drop_write(struct vfsmount *); |
| |
| struct file_system_type; |
| 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 dev_t name_to_dev_t(const char *name); |
| |
| extern unsigned int sysctl_mount_max; |
| |
| extern bool path_is_mountpoint(const struct path *path); |
| |
| extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num); |
| |
| #endif /* _LINUX_MOUNT_H */ |