Commit | Line | Data |
---|---|---|
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 | ||
726c3342 DH |
20 | struct super_block; |
21 | struct vfsmount; | |
22 | struct dentry; | |
23 | struct namespace; | |
24 | ||
07b20889 RP |
25 | #define MNT_NOSUID 0x01 |
26 | #define MNT_NODEV 0x02 | |
27 | #define MNT_NOEXEC 0x04 | |
fc33a7bb CH |
28 | #define MNT_NOATIME 0x08 |
29 | #define MNT_NODIRATIME 0x10 | |
bf066c7d | 30 | |
fc33a7bb CH |
31 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
32 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ | |
33 | #define MNT_PNODE_MASK 0x3000 /* propogation flag mask */ | |
1da177e4 | 34 | |
07b20889 | 35 | struct vfsmount { |
1da177e4 LT |
36 | struct list_head mnt_hash; |
37 | struct vfsmount *mnt_parent; /* fs we are mounted on */ | |
38 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ | |
39 | struct dentry *mnt_root; /* root of the mounted tree */ | |
40 | struct super_block *mnt_sb; /* pointer to superblock */ | |
41 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
42 | struct list_head mnt_child; /* and going through their mnt_child */ | |
43 | atomic_t mnt_count; | |
44 | int mnt_flags; | |
45 | int mnt_expiry_mark; /* true if marked for expiry */ | |
46 | char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ | |
47 | struct list_head mnt_list; | |
55e700b9 | 48 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
03e06e68 | 49 | struct list_head mnt_share; /* circular list of shared mounts */ |
a58b0eb8 RP |
50 | struct list_head mnt_slave_list;/* list of slave mounts */ |
51 | struct list_head mnt_slave; /* slave list entry */ | |
52 | struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ | |
1da177e4 | 53 | struct namespace *mnt_namespace; /* containing namespace */ |
7b7b1ace | 54 | int mnt_pinned; |
1da177e4 LT |
55 | }; |
56 | ||
57 | static inline struct vfsmount *mntget(struct vfsmount *mnt) | |
58 | { | |
59 | if (mnt) | |
60 | atomic_inc(&mnt->mnt_count); | |
61 | return mnt; | |
62 | } | |
63 | ||
7b7b1ace AV |
64 | extern void mntput_no_expire(struct vfsmount *mnt); |
65 | extern void mnt_pin(struct vfsmount *mnt); | |
66 | extern void mnt_unpin(struct vfsmount *mnt); | |
1da177e4 LT |
67 | |
68 | static inline void mntput(struct vfsmount *mnt) | |
69 | { | |
70 | if (mnt) { | |
71 | mnt->mnt_expiry_mark = 0; | |
751c404b | 72 | mntput_no_expire(mnt); |
1da177e4 LT |
73 | } |
74 | } | |
75 | ||
76 | extern void free_vfsmnt(struct vfsmount *mnt); | |
77 | extern struct vfsmount *alloc_vfsmnt(const char *name); | |
78 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, | |
79 | const char *name, void *data); | |
80 | ||
81 | struct nameidata; | |
82 | ||
83 | extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd, | |
84 | int mnt_flags, struct list_head *fslist); | |
85 | ||
86 | extern void mark_mounts_for_expiry(struct list_head *mounts); | |
87 | ||
88 | extern spinlock_t vfsmount_lock; | |
d53d9f16 | 89 | extern dev_t name_to_dev_t(char *name); |
1da177e4 LT |
90 | |
91 | #endif | |
92 | #endif /* _LINUX_MOUNT_H */ |