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>
8 * Version: $Id: mount.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $
11 #ifndef _LINUX_MOUNT_H
12 #define _LINUX_MOUNT_H
15 #include <linux/types.h>
16 #include <linux/list.h>
17 #include <linux/spinlock.h>
18 #include <asm/atomic.h>
25 #define MNT_NOSUID 0x01
26 #define MNT_NODEV 0x02
27 #define MNT_NOEXEC 0x04
28 #define MNT_NOATIME 0x08
29 #define MNT_NODIRATIME 0x10
30 #define MNT_RDONLY 0x20
32 #define MNT_IS_RDONLY(m) ((m) && ((m)->mnt_flags & MNT_RDONLY))
34 #define MNT_SHRINKABLE 0x100
36 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
37 #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
38 #define MNT_PNODE_MASK 0x3000 /* propogation flag mask */
39 #define MNT_XID 0x8000
42 struct list_head mnt_hash;
43 struct vfsmount *mnt_parent; /* fs we are mounted on */
44 struct dentry *mnt_mountpoint; /* dentry of mountpoint */
45 struct dentry *mnt_root; /* root of the mounted tree */
46 struct super_block *mnt_sb; /* pointer to superblock */
47 struct list_head mnt_mounts; /* list of children, anchored here */
48 struct list_head mnt_child; /* and going through their mnt_child */
51 int mnt_expiry_mark; /* true if marked for expiry */
52 char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
53 struct list_head mnt_list;
54 struct list_head mnt_expire; /* link in fs-specific expiry list */
55 struct list_head mnt_share; /* circular list of shared mounts */
56 struct list_head mnt_slave_list;/* list of slave mounts */
57 struct list_head mnt_slave; /* slave list entry */
58 struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
59 struct namespace *mnt_namespace; /* containing namespace */
61 xid_t mnt_xid; /* xid tagging used for vfsmount */
64 static inline struct vfsmount *mntget(struct vfsmount *mnt)
67 atomic_inc(&mnt->mnt_count);
71 extern void mntput_no_expire(struct vfsmount *mnt);
72 extern void mnt_pin(struct vfsmount *mnt);
73 extern void mnt_unpin(struct vfsmount *mnt);
75 static inline void mntput(struct vfsmount *mnt)
78 mnt->mnt_expiry_mark = 0;
79 mntput_no_expire(mnt);
83 extern void free_vfsmnt(struct vfsmount *mnt);
84 extern struct vfsmount *alloc_vfsmnt(const char *name);
85 extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
86 const char *name, void *data);
88 struct file_system_type;
89 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
90 int flags, const char *name,
95 extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
96 int mnt_flags, struct list_head *fslist);
98 extern void mark_mounts_for_expiry(struct list_head *mounts);
99 extern void shrink_submounts(struct vfsmount *mountpoint, struct list_head *mounts);
101 extern spinlock_t vfsmount_lock;
102 extern dev_t name_to_dev_t(char *name);
105 #endif /* _LINUX_MOUNT_H */