include/linux/mount.h

   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  * Version: $Id: mount.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $
   9  *
  10  */
  11 #ifndef _LINUX_MOUNT_H
  12 #define _LINUX_MOUNT_H
  13 #ifdef __KERNEL__
  14
  15 #include <linux/list.h>
  16
  17 #define MNT_NOSUID      1
  18 #define MNT_NODEV       2
  19 #define MNT_NOEXEC      4
  20
  21 struct vfsmount
  22 {
  23         struct list_head mnt_hash;
  24         struct vfsmount *mnt_parent;    /* fs we are mounted on */
  25         struct dentry *mnt_mountpoint;  /* dentry of mountpoint */
  26         struct dentry *mnt_root;        /* root of the mounted tree */
  27         struct super_block *mnt_sb;     /* pointer to superblock */
  28         struct list_head mnt_mounts;    /* list of children, anchored here */
  29         struct list_head mnt_child;     /* and going through their mnt_child */
  30         atomic_t mnt_count;
  31         int mnt_flags;
  32         char *mnt_devname;              /* Name of device e.g. /dev/dsk/hda1 */
  33         struct list_head mnt_list;
  34 };
  35
  36 static inline struct vfsmount *mntget(struct vfsmount *mnt)
  37 {
  38         if (mnt)
  39                 atomic_inc(&mnt->mnt_count);
  40         return mnt;
  41 }
  42
  43 extern void __mntput(struct vfsmount *mnt);
  44
  45 static inline void mntput(struct vfsmount *mnt)
  46 {
  47         if (mnt) {
  48                 if (atomic_dec_and_test(&mnt->mnt_count))
  49                         __mntput(mnt);
  50         }
  51 }
  52
  53 extern void free_vfsmnt(struct vfsmount *mnt);
  54 extern struct vfsmount *alloc_vfsmnt(const char *name);
  55 extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
  56                                       const char *name, void *data);
  57 extern spinlock_t vfsmount_lock;
  58
  59 #endif
  60 #endif /* _LINUX_MOUNT_H */