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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 * 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/types.h>
16#include <linux/list.h>
17#include <linux/spinlock.h>
18#include <asm/atomic.h>
19
20#define MNT_NOSUID 0x01
21#define MNT_NODEV 0x02
22#define MNT_NOEXEC 0x04
23#define MNT_NOATIME 0x08
24#define MNT_NODIRATIME 0x10
25
26#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
27#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
28#define MNT_PNODE_MASK 0x3000 /* propogation flag mask */
29
30struct vfsmount {
31 struct list_head mnt_hash;
32 struct vfsmount *mnt_parent; /* fs we are mounted on */
33 struct dentry *mnt_mountpoint; /* dentry of mountpoint */
34 struct dentry *mnt_root; /* root of the mounted tree */
35 struct super_block *mnt_sb; /* pointer to superblock */
36 struct list_head mnt_mounts; /* list of children, anchored here */
37 struct list_head mnt_child; /* and going through their mnt_child */
38 atomic_t mnt_count;
39 int mnt_flags;
40 int mnt_expiry_mark; /* true if marked for expiry */
41 char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
42 struct list_head mnt_list;
43 struct list_head mnt_expire; /* link in fs-specific expiry list */
44 struct list_head mnt_share; /* circular list of shared mounts */
45 struct list_head mnt_slave_list;/* list of slave mounts */
46 struct list_head mnt_slave; /* slave list entry */
47 struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
48 struct namespace *mnt_namespace; /* containing namespace */
49 int mnt_pinned;
50};
51
52static inline struct vfsmount *mntget(struct vfsmount *mnt)
53{
54 if (mnt)
55 atomic_inc(&mnt->mnt_count);
56 return mnt;
57}
58
59extern void mntput_no_expire(struct vfsmount *mnt);
60extern void mnt_pin(struct vfsmount *mnt);
61extern void mnt_unpin(struct vfsmount *mnt);
62
63static inline void mntput(struct vfsmount *mnt)
64{
65 if (mnt) {
66 mnt->mnt_expiry_mark = 0;
67 mntput_no_expire(mnt);
68 }
69}
70
71extern void free_vfsmnt(struct vfsmount *mnt);
72extern struct vfsmount *alloc_vfsmnt(const char *name);
73extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
74 const char *name, void *data);
75
76struct nameidata;
77
78extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
79 int mnt_flags, struct list_head *fslist);
80
81extern void mark_mounts_for_expiry(struct list_head *mounts);
82
83extern spinlock_t vfsmount_lock;
84extern dev_t name_to_dev_t(char *name);
85
86#endif
87#endif /* _LINUX_MOUNT_H */