3 * Definitions for mount interface. This describes the in the kernel build
4 * linkedlist with mounted filesystems.
6 * Author: Marco van Wieringen <mvw@planets.elm.net>
8 * Version: $Id: mount.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $
11 #ifndef _LINUX_MOUNT_H
12 #define _LINUX_MOUNT_H
15 #include <linux/list.h>
16 #include <linux/spinlock.h>
17 #include <asm/atomic.h>
23 #define MNT_NOATIME 16
24 #define MNT_NODIRATIME 32
29 struct list_head mnt_hash;
30 struct vfsmount *mnt_parent; /* fs we are mounted on */
31 struct dentry *mnt_mountpoint; /* dentry of mountpoint */
32 struct dentry *mnt_root; /* root of the mounted tree */
33 struct super_block *mnt_sb; /* pointer to superblock */
34 struct list_head mnt_mounts; /* list of children, anchored here */
35 struct list_head mnt_child; /* and going through their mnt_child */
38 int mnt_expiry_mark; /* true if marked for expiry */
39 char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
40 struct list_head mnt_list;
41 struct list_head mnt_fslink; /* link in fs-specific expiry list */
42 struct namespace *mnt_namespace; /* containing namespace */
43 xid_t mnt_xid; /* xid tagging used for vfsmount */
46 #define MNT_IS_RDONLY(m) ((m) && ((m)->mnt_flags & MNT_RDONLY))
47 #define MNT_IS_NOATIME(m) ((m) && ((m)->mnt_flags & MNT_NOATIME))
48 #define MNT_IS_NODIRATIME(m) ((m) && ((m)->mnt_flags & MNT_NODIRATIME))
50 static inline struct vfsmount *mntget(struct vfsmount *mnt)
53 atomic_inc(&mnt->mnt_count);
57 extern void __mntput(struct vfsmount *mnt);
59 static inline void _mntput(struct vfsmount *mnt)
62 if (atomic_dec_and_test(&mnt->mnt_count))
67 static inline void mntput(struct vfsmount *mnt)
70 mnt->mnt_expiry_mark = 0;
75 extern void free_vfsmnt(struct vfsmount *mnt);
76 extern struct vfsmount *alloc_vfsmnt(const char *name);
77 extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
78 const char *name, void *data);
82 extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
83 int mnt_flags, struct list_head *fslist);
85 extern void mark_mounts_for_expiry(struct list_head *mounts);
87 extern spinlock_t vfsmount_lock;
90 #endif /* _LINUX_MOUNT_H */