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 <linux/seqlock.h>
17 #include <linux/atomic.h>
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? */
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 dentry *mnt_root; /* root of the mounted tree */
52 struct super_block *mnt_sb; /* pointer to superblock */
53 struct list_head mnt_mounts; /* list of children, anchored here */
54 struct list_head mnt_child; /* and going through their mnt_child */
56 /* 4 bytes hole on 64bits arches without fsnotify */
57 #ifdef CONFIG_FSNOTIFY
58 __u32 mnt_fsnotify_mask;
59 struct hlist_head mnt_fsnotify_marks;
61 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
62 struct list_head mnt_list;
63 struct list_head mnt_expire; /* link in fs-specific expiry list */
64 struct list_head mnt_share; /* circular list of shared mounts */
65 struct list_head mnt_slave_list;/* list of slave mounts */
66 struct list_head mnt_slave; /* slave list entry */
67 struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */
68 struct mnt_namespace *mnt_ns; /* containing namespace */
69 int mnt_id; /* mount identifier */
70 int mnt_group_id; /* peer group identifier */
71 int mnt_expiry_mark; /* true if marked for expiry */
76 struct file; /* forward dec */
78 extern int mnt_want_write(struct vfsmount *mnt);
79 extern int mnt_want_write_file(struct file *file);
80 extern int mnt_clone_write(struct vfsmount *mnt);
81 extern void mnt_drop_write(struct vfsmount *mnt);
82 extern void mnt_drop_write_file(struct file *file);
83 extern void mntput(struct vfsmount *mnt);
84 extern struct vfsmount *mntget(struct vfsmount *mnt);
85 extern void mnt_pin(struct vfsmount *mnt);
86 extern void mnt_unpin(struct vfsmount *mnt);
87 extern int __mnt_is_readonly(struct vfsmount *mnt);
89 struct file_system_type;
90 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
91 int flags, const char *name,
94 extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
95 extern void mark_mounts_for_expiry(struct list_head *mounts);
97 extern dev_t name_to_dev_t(char *name);
99 #endif /* _LINUX_MOUNT_H */