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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
20struct super_block;
21struct vfsmount;
22struct dentry;
23struct namespace;
24
25#define MNT_NOSUID 0x01
26#define MNT_NODEV 0x02
27#define MNT_NOEXEC 0x04
28#define MNT_NOATIME 0x08
29#define MNT_NODIRATIME 0x10
30
31#define MNT_SHRINKABLE 0x100
32
33#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
34#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
35#define MNT_PNODE_MASK 0x3000 /* propogation flag mask */
36
37struct vfsmount {
38 struct list_head mnt_hash;
39 struct vfsmount *mnt_parent; /* fs we are mounted on */
40 struct dentry *mnt_mountpoint; /* dentry of mountpoint */
41 struct dentry *mnt_root; /* root of the mounted tree */
42 struct super_block *mnt_sb; /* pointer to superblock */
43 struct list_head mnt_mounts; /* list of children, anchored here */
44 struct list_head mnt_child; /* and going through their mnt_child */
45 atomic_t mnt_count;
46 int mnt_flags;
47 int mnt_expiry_mark; /* true if marked for expiry */
48 char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
49 struct list_head mnt_list;
50 struct list_head mnt_expire; /* link in fs-specific expiry list */
51 struct list_head mnt_share; /* circular list of shared mounts */
52 struct list_head mnt_slave_list;/* list of slave mounts */
53 struct list_head mnt_slave; /* slave list entry */
54 struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
55 struct namespace *mnt_namespace; /* containing namespace */
56 int mnt_pinned;
57};
58
59static inline struct vfsmount *mntget(struct vfsmount *mnt)
60{
61 if (mnt)
62 atomic_inc(&mnt->mnt_count);
63 return mnt;
64}
65
66extern void mntput_no_expire(struct vfsmount *mnt);
67extern void mnt_pin(struct vfsmount *mnt);
68extern void mnt_unpin(struct vfsmount *mnt);
69
70static inline void mntput(struct vfsmount *mnt)
71{
72 if (mnt) {
73 mnt->mnt_expiry_mark = 0;
74 mntput_no_expire(mnt);
75 }
76}
77
78extern void free_vfsmnt(struct vfsmount *mnt);
79extern struct vfsmount *alloc_vfsmnt(const char *name);
80extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
81 const char *name, void *data);
82
83struct file_system_type;
84extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
85 int flags, const char *name,
86 void *data);
87
88struct nameidata;
89
90extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
91 int mnt_flags, struct list_head *fslist);
92
93extern void mark_mounts_for_expiry(struct list_head *mounts);
94extern void shrink_submounts(struct vfsmount *mountpoint, struct list_head *mounts);
95
96extern spinlock_t vfsmount_lock;
97extern dev_t name_to_dev_t(char *name);
98
99#endif
100#endif /* _LINUX_MOUNT_H */