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
  19struct super_block;
  20struct vfsmount;
  21struct dentry;
  22struct 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
  52struct 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
  58struct file; /* forward dec */
  59
  60extern int mnt_want_write(struct vfsmount *mnt);
  61extern int mnt_want_write_file(struct file *file);
  62extern int mnt_clone_write(struct vfsmount *mnt);
  63extern void mnt_drop_write(struct vfsmount *mnt);
  64extern void mnt_drop_write_file(struct file *file);
  65extern void mntput(struct vfsmount *mnt);
  66extern struct vfsmount *mntget(struct vfsmount *mnt);
  67extern void mnt_pin(struct vfsmount *mnt);
  68extern void mnt_unpin(struct vfsmount *mnt);
  69extern int __mnt_is_readonly(struct vfsmount *mnt);
  70
  71struct file_system_type;
  72extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
  73                                      int flags, const char *name,
  74                                      void *data);
  75
  76extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
  77extern void mark_mounts_for_expiry(struct list_head *mounts);
  78
  79extern dev_t name_to_dev_t(char *name);
  80
  81#endif /* _LINUX_MOUNT_H */
  82
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