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

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

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