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1da177e4 LT |
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 | ||
d53d9f16 | 15 | #include <linux/types.h> |
1da177e4 LT |
16 | #include <linux/list.h> |
17 | #include <linux/spinlock.h> | |
18 | #include <asm/atomic.h> | |
19 | ||
20 | #define MNT_NOSUID 1 | |
21 | #define MNT_NODEV 2 | |
22 | #define MNT_NOEXEC 4 | |
23 | ||
24 | struct vfsmount | |
25 | { | |
26 | struct list_head mnt_hash; | |
27 | struct vfsmount *mnt_parent; /* fs we are mounted on */ | |
28 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ | |
29 | struct dentry *mnt_root; /* root of the mounted tree */ | |
30 | struct super_block *mnt_sb; /* pointer to superblock */ | |
31 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
32 | struct list_head mnt_child; /* and going through their mnt_child */ | |
33 | atomic_t mnt_count; | |
34 | int mnt_flags; | |
35 | int mnt_expiry_mark; /* true if marked for expiry */ | |
36 | char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ | |
37 | struct list_head mnt_list; | |
55e700b9 | 38 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
1da177e4 | 39 | struct namespace *mnt_namespace; /* containing namespace */ |
7b7b1ace | 40 | int mnt_pinned; |
1da177e4 LT |
41 | }; |
42 | ||
43 | static inline struct vfsmount *mntget(struct vfsmount *mnt) | |
44 | { | |
45 | if (mnt) | |
46 | atomic_inc(&mnt->mnt_count); | |
47 | return mnt; | |
48 | } | |
49 | ||
7b7b1ace AV |
50 | extern void mntput_no_expire(struct vfsmount *mnt); |
51 | extern void mnt_pin(struct vfsmount *mnt); | |
52 | extern void mnt_unpin(struct vfsmount *mnt); | |
1da177e4 LT |
53 | |
54 | static inline void mntput(struct vfsmount *mnt) | |
55 | { | |
56 | if (mnt) { | |
57 | mnt->mnt_expiry_mark = 0; | |
751c404b | 58 | mntput_no_expire(mnt); |
1da177e4 LT |
59 | } |
60 | } | |
61 | ||
62 | extern void free_vfsmnt(struct vfsmount *mnt); | |
63 | extern struct vfsmount *alloc_vfsmnt(const char *name); | |
64 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, | |
65 | const char *name, void *data); | |
66 | ||
67 | struct nameidata; | |
68 | ||
69 | extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd, | |
70 | int mnt_flags, struct list_head *fslist); | |
71 | ||
72 | extern void mark_mounts_for_expiry(struct list_head *mounts); | |
73 | ||
74 | extern spinlock_t vfsmount_lock; | |
d53d9f16 | 75 | extern dev_t name_to_dev_t(char *name); |
1da177e4 LT |
76 | |
77 | #endif | |
78 | #endif /* _LINUX_MOUNT_H */ |