3 * Definitions for mount interface. This describes the in the kernel build
4 * linkedlist with mounted filesystems.
6 * Author: Marco van Wieringen <mvw@planets.elm.net>
10 #define _LINUX_MOUNT_H
12 #include <linux/types.h>
13 #include <linux/list.h>
14 #include <linux/nodemask.h>
15 #include <linux/spinlock.h>
16 #include <asm/atomic.h>
23 #define MNT_NOSUID 0x01
24 #define MNT_NODEV 0x02
25 #define MNT_NOEXEC 0x04
26 #define MNT_NOATIME 0x08
27 #define MNT_NODIRATIME 0x10
28 #define MNT_RELATIME 0x20
29 #define MNT_READONLY 0x40 /* does the user want this to be r/o? */
30 #define MNT_STRICTATIME 0x80
32 #define MNT_SHRINKABLE 0x100
33 #define MNT_WRITE_HOLD 0x200
35 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
36 #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
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.
44 #define MNT_SHARED_MASK (MNT_UNBINDABLE)
45 #define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE)
48 #define MNT_INTERNAL 0x4000
51 struct list_head mnt_hash
;
52 struct vfsmount
*mnt_parent
; /* fs we are mounted on */
53 struct dentry
*mnt_mountpoint
; /* dentry of mountpoint */
54 struct dentry
*mnt_root
; /* root of the mounted tree */
55 struct super_block
*mnt_sb
; /* pointer to superblock */
56 struct list_head mnt_mounts
; /* list of children, anchored here */
57 struct list_head mnt_child
; /* and going through their mnt_child */
59 /* 4 bytes hole on 64bits arches */
60 const char *mnt_devname
; /* Name of device e.g. /dev/dsk/hda1 */
61 struct list_head mnt_list
;
62 struct list_head mnt_expire
; /* link in fs-specific expiry list */
63 struct list_head mnt_share
; /* circular list of shared mounts */
64 struct list_head mnt_slave_list
;/* list of slave mounts */
65 struct list_head mnt_slave
; /* slave list entry */
66 struct vfsmount
*mnt_master
; /* slave is on master->mnt_slave_list */
67 struct mnt_namespace
*mnt_ns
; /* containing namespace */
68 int mnt_id
; /* mount identifier */
69 int mnt_group_id
; /* peer group identifier */
71 * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
72 * to let these frequently modified fields in a separate cache line
73 * (so that reads of mnt_flags wont ping-pong on SMP machines)
76 int mnt_expiry_mark
; /* true if marked for expiry */
80 int __percpu
*mnt_writers
;
86 static inline int *get_mnt_writers_ptr(struct vfsmount
*mnt
)
89 return mnt
->mnt_writers
;
91 return &mnt
->mnt_writers
;
95 static inline struct vfsmount
*mntget(struct vfsmount
*mnt
)
98 atomic_inc(&mnt
->mnt_count
);
102 struct file
; /* forward dec */
104 extern int mnt_want_write(struct vfsmount
*mnt
);
105 extern int mnt_want_write_file(struct file
*file
);
106 extern int mnt_clone_write(struct vfsmount
*mnt
);
107 extern void mnt_drop_write(struct vfsmount
*mnt
);
108 extern void mntput_no_expire(struct vfsmount
*mnt
);
109 extern void mnt_pin(struct vfsmount
*mnt
);
110 extern void mnt_unpin(struct vfsmount
*mnt
);
111 extern int __mnt_is_readonly(struct vfsmount
*mnt
);
113 static inline void mntput(struct vfsmount
*mnt
)
116 mnt
->mnt_expiry_mark
= 0;
117 mntput_no_expire(mnt
);
121 extern struct vfsmount
*do_kern_mount(const char *fstype
, int flags
,
122 const char *name
, void *data
);
124 struct file_system_type
;
125 extern struct vfsmount
*vfs_kern_mount(struct file_system_type
*type
,
126 int flags
, const char *name
,
132 extern int do_add_mount(struct vfsmount
*newmnt
, struct path
*path
,
133 int mnt_flags
, struct list_head
*fslist
);
135 extern void mark_mounts_for_expiry(struct list_head
*mounts
);
137 extern dev_t
name_to_dev_t(char *name
);
139 #endif /* _LINUX_MOUNT_H */
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