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TOMOYO Linux Cross Reference
Linux/include/linux/mount.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *
  4  * Definitions for mount interface. This describes the in the kernel build 
  5  * linkedlist with mounted filesystems.
  6  *
  7  * Author:  Marco van Wieringen <mvw@planets.elm.net>
  8  *
  9  */
 10 #ifndef _LINUX_MOUNT_H
 11 #define _LINUX_MOUNT_H
 12 
 13 #include <linux/types.h>
 14 #include <linux/list.h>
 15 #include <linux/nodemask.h>
 16 #include <linux/spinlock.h>
 17 #include <linux/seqlock.h>
 18 #include <linux/atomic.h>
 19 
 20 struct super_block;
 21 struct vfsmount;
 22 struct dentry;
 23 struct mnt_namespace;
 24 
 25 #define MNT_NOSUID      0x01
 26 #define MNT_NODEV       0x02
 27 #define MNT_NOEXEC      0x04
 28 #define MNT_NOATIME     0x08
 29 #define MNT_NODIRATIME  0x10
 30 #define MNT_RELATIME    0x20
 31 #define MNT_READONLY    0x40    /* does the user want this to be r/o? */
 32 
 33 #define MNT_SHRINKABLE  0x100
 34 #define MNT_WRITE_HOLD  0x200
 35 
 36 #define MNT_SHARED      0x1000  /* if the vfsmount is a shared mount */
 37 #define MNT_UNBINDABLE  0x2000  /* if the vfsmount is a unbindable mount */
 38 /*
 39  * MNT_SHARED_MASK is the set of flags that should be cleared when a
 40  * mount becomes shared.  Currently, this is only the flag that says a
 41  * mount cannot be bind mounted, since this is how we create a mount
 42  * that shares events with another mount.  If you add a new MNT_*
 43  * flag, consider how it interacts with shared mounts.
 44  */
 45 #define MNT_SHARED_MASK (MNT_UNBINDABLE)
 46 #define MNT_USER_SETTABLE_MASK  (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \
 47                                  | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \
 48                                  | MNT_READONLY)
 49 #define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )
 50 
 51 #define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
 52                             MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED)
 53 
 54 #define MNT_INTERNAL    0x4000
 55 
 56 #define MNT_LOCK_ATIME          0x040000
 57 #define MNT_LOCK_NOEXEC         0x080000
 58 #define MNT_LOCK_NOSUID         0x100000
 59 #define MNT_LOCK_NODEV          0x200000
 60 #define MNT_LOCK_READONLY       0x400000
 61 #define MNT_LOCKED              0x800000
 62 #define MNT_DOOMED              0x1000000
 63 #define MNT_SYNC_UMOUNT         0x2000000
 64 #define MNT_MARKED              0x4000000
 65 #define MNT_UMOUNT              0x8000000
 66 
 67 struct vfsmount {
 68         struct dentry *mnt_root;        /* root of the mounted tree */
 69         struct super_block *mnt_sb;     /* pointer to superblock */
 70         int mnt_flags;
 71 } __randomize_layout;
 72 
 73 struct file; /* forward dec */
 74 struct path;
 75 
 76 extern int mnt_want_write(struct vfsmount *mnt);
 77 extern int mnt_want_write_file(struct file *file);
 78 extern int mnt_clone_write(struct vfsmount *mnt);
 79 extern void mnt_drop_write(struct vfsmount *mnt);
 80 extern void mnt_drop_write_file(struct file *file);
 81 extern void mntput(struct vfsmount *mnt);
 82 extern struct vfsmount *mntget(struct vfsmount *mnt);
 83 extern struct vfsmount *mnt_clone_internal(const struct path *path);
 84 extern int __mnt_is_readonly(struct vfsmount *mnt);
 85 extern bool mnt_may_suid(struct vfsmount *mnt);
 86 
 87 struct path;
 88 extern struct vfsmount *clone_private_mount(const struct path *path);
 89 
 90 struct file_system_type;
 91 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
 92                                       int flags, const char *name,
 93                                       void *data);
 94 extern struct vfsmount *vfs_submount(const struct dentry *mountpoint,
 95                                      struct file_system_type *type,
 96                                      const char *name, void *data);
 97 
 98 extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
 99 extern void mark_mounts_for_expiry(struct list_head *mounts);
100 
101 extern dev_t name_to_dev_t(const char *name);
102 
103 extern unsigned int sysctl_mount_max;
104 
105 extern bool path_is_mountpoint(const struct path *path);
106 
107 #endif /* _LINUX_MOUNT_H */
108 

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