Commit | Line | Data |
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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 | ||
07b20889 RP |
20 | #define MNT_NOSUID 0x01 |
21 | #define MNT_NODEV 0x02 | |
22 | #define MNT_NOEXEC 0x04 | |
03e06e68 | 23 | #define MNT_SHARED 0x10 /* if the vfsmount is a shared mount */ |
9676f0c6 | 24 | #define MNT_UNBINDABLE 0x20 /* if the vfsmount is a unbindable mount */ |
07b20889 | 25 | #define MNT_PNODE_MASK 0x30 /* propogation flag mask */ |
1da177e4 | 26 | |
07b20889 | 27 | struct vfsmount { |
1da177e4 LT |
28 | struct list_head mnt_hash; |
29 | struct vfsmount *mnt_parent; /* fs we are mounted on */ | |
30 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ | |
31 | struct dentry *mnt_root; /* root of the mounted tree */ | |
32 | struct super_block *mnt_sb; /* pointer to superblock */ | |
33 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
34 | struct list_head mnt_child; /* and going through their mnt_child */ | |
35 | atomic_t mnt_count; | |
36 | int mnt_flags; | |
37 | int mnt_expiry_mark; /* true if marked for expiry */ | |
38 | char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ | |
39 | struct list_head mnt_list; | |
55e700b9 | 40 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
03e06e68 | 41 | struct list_head mnt_share; /* circular list of shared mounts */ |
a58b0eb8 RP |
42 | struct list_head mnt_slave_list;/* list of slave mounts */ |
43 | struct list_head mnt_slave; /* slave list entry */ | |
44 | struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ | |
1da177e4 | 45 | struct namespace *mnt_namespace; /* containing namespace */ |
7b7b1ace | 46 | int mnt_pinned; |
1da177e4 LT |
47 | }; |
48 | ||
49 | static inline struct vfsmount *mntget(struct vfsmount *mnt) | |
50 | { | |
51 | if (mnt) | |
52 | atomic_inc(&mnt->mnt_count); | |
53 | return mnt; | |
54 | } | |
55 | ||
7b7b1ace AV |
56 | extern void mntput_no_expire(struct vfsmount *mnt); |
57 | extern void mnt_pin(struct vfsmount *mnt); | |
58 | extern void mnt_unpin(struct vfsmount *mnt); | |
1da177e4 LT |
59 | |
60 | static inline void mntput(struct vfsmount *mnt) | |
61 | { | |
62 | if (mnt) { | |
63 | mnt->mnt_expiry_mark = 0; | |
751c404b | 64 | mntput_no_expire(mnt); |
1da177e4 LT |
65 | } |
66 | } | |
67 | ||
68 | extern void free_vfsmnt(struct vfsmount *mnt); | |
69 | extern struct vfsmount *alloc_vfsmnt(const char *name); | |
70 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, | |
71 | const char *name, void *data); | |
72 | ||
73 | struct nameidata; | |
74 | ||
75 | extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd, | |
76 | int mnt_flags, struct list_head *fslist); | |
77 | ||
78 | extern void mark_mounts_for_expiry(struct list_head *mounts); | |
79 | ||
80 | extern spinlock_t vfsmount_lock; | |
d53d9f16 | 81 | extern dev_t name_to_dev_t(char *name); |
1da177e4 LT |
82 | |
83 | #endif | |
84 | #endif /* _LINUX_MOUNT_H */ |