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>
20 #define MNT_NOSUID 0x01
21 #define MNT_NODEV 0x02
22 #define MNT_NOEXEC 0x04
23 #define MNT_NOATIME 0x08
24 #define MNT_NODIRATIME 0x10
25 #define MNT_RDONLY 0x20
27 #define MNT_IS_RDONLY(m) ((m) && ((m)->mnt_flags & MNT_RDONLY))
29 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
30 #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
31 #define MNT_PNODE_MASK 0x3000 /* propogation flag mask */
32 #define MNT_XID 0x8000
35 struct list_head mnt_hash;
36 struct vfsmount *mnt_parent; /* fs we are mounted on */
37 struct dentry *mnt_mountpoint; /* dentry of mountpoint */
38 struct dentry *mnt_root; /* root of the mounted tree */
39 struct super_block *mnt_sb; /* pointer to superblock */
40 struct list_head mnt_mounts; /* list of children, anchored here */
41 struct list_head mnt_child; /* and going through their mnt_child */
44 int mnt_expiry_mark; /* true if marked for expiry */
45 char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
46 struct list_head mnt_list;
47 struct list_head mnt_expire; /* link in fs-specific expiry list */
48 struct list_head mnt_share; /* circular list of shared mounts */
49 struct list_head mnt_slave_list;/* list of slave mounts */
50 struct list_head mnt_slave; /* slave list entry */
51 struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
52 struct namespace *mnt_namespace; /* containing namespace */
54 xid_t mnt_xid; /* xid tagging used for vfsmount */
57 static inline struct vfsmount *mntget(struct vfsmount *mnt)
60 atomic_inc(&mnt->mnt_count);
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);
68 static inline void mntput(struct vfsmount *mnt)
71 mnt->mnt_expiry_mark = 0;
72 mntput_no_expire(mnt);
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);
83 extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
84 int mnt_flags, struct list_head *fslist);
86 extern void mark_mounts_for_expiry(struct list_head *mounts);
88 extern spinlock_t vfsmount_lock;
89 extern dev_t name_to_dev_t(char *name);
92 #endif /* _LINUX_MOUNT_H */