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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_PROPAGATION_MASK    (MNT_SHARED | MNT_UNBINDABLE)
 46 
 47 
 48 #define MNT_INTERNAL    0x4000
 49 
 50 #define MNT_LOCK_READONLY       0x400000
 51 
 52 struct vfsmount {
 53         struct dentry *mnt_root;        /* root of the mounted tree */
 54         struct super_block *mnt_sb;     /* pointer to superblock */
 55         int mnt_flags;
 56 };
 57 
 58 struct file; /* forward dec */
 59 
 60 extern int mnt_want_write(struct vfsmount *mnt);
 61 extern int mnt_want_write_file(struct file *file);
 62 extern int mnt_clone_write(struct vfsmount *mnt);
 63 extern void mnt_drop_write(struct vfsmount *mnt);
 64 extern void mnt_drop_write_file(struct file *file);
 65 extern void mntput(struct vfsmount *mnt);
 66 extern struct vfsmount *mntget(struct vfsmount *mnt);
 67 extern void mnt_pin(struct vfsmount *mnt);
 68 extern void mnt_unpin(struct vfsmount *mnt);
 69 extern int __mnt_is_readonly(struct vfsmount *mnt);
 70 
 71 struct file_system_type;
 72 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
 73                                       int flags, const char *name,
 74                                       void *data);
 75 
 76 extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
 77 extern void mark_mounts_for_expiry(struct list_head *mounts);
 78 
 79 extern dev_t name_to_dev_t(char *name);
 80 
 81 #endif /* _LINUX_MOUNT_H */
 82 

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