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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 | */ |
9 | #ifndef _LINUX_MOUNT_H |
10 | #define _LINUX_MOUNT_H |
11 | |
12 | #include <linux/types.h> |
13 | #include <linux/list.h> |
14 | #include <linux/nodemask.h> |
15 | #include <linux/spinlock.h> |
16 | #include <linux/seqlock.h> |
17 | #include <linux/atomic.h> |
18 | |
19 | struct super_block; |
20 | struct vfsmount; |
21 | struct dentry; |
22 | struct mnt_namespace; |
23 | |
24 | #define MNT_NOSUID 0x01 |
25 | #define MNT_NODEV 0x02 |
26 | #define MNT_NOEXEC 0x04 |
27 | #define MNT_NOATIME 0x08 |
28 | #define MNT_NODIRATIME 0x10 |
29 | #define MNT_RELATIME 0x20 |
30 | #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ |
31 | |
32 | #define MNT_SHRINKABLE 0x100 |
33 | #define MNT_WRITE_HOLD 0x200 |
34 | |
35 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
36 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ |
37 | /* |
38 | * MNT_SHARED_MASK is the set of flags that should be cleared when a |
39 | * mount becomes shared. Currently, this is only the flag that says a |
40 | * mount cannot be bind mounted, since this is how we create a mount |
41 | * that shares events with another mount. If you add a new MNT_* |
42 | * flag, consider how it interacts with shared mounts. |
43 | */ |
44 | #define MNT_SHARED_MASK (MNT_UNBINDABLE) |
45 | #define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE) |
46 | |
47 | |
48 | #define MNT_INTERNAL 0x4000 |
49 | |
50 | #define MNT_LOCK_READONLY 0x400000 |
51 | |
52 | struct vfsmount { |
53 | struct dentry *mnt_root; /* root of the mounted tree */ |
54 | struct super_block *mnt_sb; /* pointer to superblock */ |
55 | int mnt_flags; |
56 | }; |
57 | |
58 | struct file; /* forward dec */ |
59 | |
60 | extern int mnt_want_write(struct vfsmount *mnt); |
61 | extern int mnt_want_write_file(struct file *file); |
62 | extern int mnt_clone_write(struct vfsmount *mnt); |
63 | extern void mnt_drop_write(struct vfsmount *mnt); |
64 | extern void mnt_drop_write_file(struct file *file); |
65 | extern void mntput(struct vfsmount *mnt); |
66 | extern struct vfsmount *mntget(struct vfsmount *mnt); |
67 | extern void mnt_pin(struct vfsmount *mnt); |
68 | extern void mnt_unpin(struct vfsmount *mnt); |
69 | extern int __mnt_is_readonly(struct vfsmount *mnt); |
70 | |
71 | struct file_system_type; |
72 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, |
73 | int flags, const char *name, |
74 | void *data); |
75 | |
76 | extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list); |
77 | extern void mark_mounts_for_expiry(struct list_head *mounts); |
78 | |
79 | extern dev_t name_to_dev_t(char *name); |
80 | |
81 | #endif /* _LINUX_MOUNT_H */ |
82 |
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